| Message ID | 20241022063155.506191-1-umang.jain@ideasonboard.com |
|---|---|
| State | New |
| Headers | show |
| Series | media: dw100: Enable dynamic vertex map | expand |
Hi Umang, kernel test robot noticed the following build warnings: [auto build test WARNING on linuxtv-media-stage/master] [also build test WARNING on media-tree/master sailus-media-tree/streams sailus-media-tree/master linus/master v6.12-rc4 next-20241022] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch#_base_tree_information] url: https://github.com/intel-lab-lkp/linux/commits/Umang-Jain/media-dw100-Enable-dynamic-vertex-map/20241022-143315 base: https://git.linuxtv.org/media_stage.git master patch link: https://lore.kernel.org/r/20241022063155.506191-1-umang.jain%40ideasonboard.com patch subject: [PATCH] media: dw100: Enable dynamic vertex map config: x86_64-allyesconfig (https://download.01.org/0day-ci/archive/20241023/202410230647.fPoPRh2O-lkp@intel.com/config) compiler: clang version 18.1.8 (https://github.com/llvm/llvm-project 3b5b5c1ec4a3095ab096dd780e84d7ab81f3d7ff) reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241023/202410230647.fPoPRh2O-lkp@intel.com/reproduce) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot <lkp@intel.com> | Closes: https://lore.kernel.org/oe-kbuild-all/202410230647.fPoPRh2O-lkp@intel.com/ All warnings (new ones prefixed by >>): >> drivers/media/platform/nxp/dw100/dw100.c:369:3: warning: label followed by a declaration is a C23 extension [-Wc23-extensions] 369 | u32 *user_map = ctrl->p_new.p_u32; | ^ 1 warning generated. Kconfig warnings: (for reference only) WARNING: unmet direct dependencies detected for MODVERSIONS Depends on [n]: MODULES [=y] && !COMPILE_TEST [=y] Selected by [y]: - RANDSTRUCT_FULL [=y] && (CC_HAS_RANDSTRUCT [=y] || GCC_PLUGINS [=n]) && MODULES [=y] vim +369 drivers/media/platform/nxp/dw100/dw100.c 361 362 static int dw100_s_ctrl(struct v4l2_ctrl *ctrl) 363 { 364 struct dw100_ctx *ctx = 365 container_of(ctrl->handler, struct dw100_ctx, hdl); 366 367 switch (ctrl->id) { 368 case V4L2_CID_DW100_DEWARPING_16x16_VERTEX_MAP: > 369 u32 *user_map = ctrl->p_new.p_u32; 370 unsigned int id; 371 372 mutex_lock(&ctx->maps_mutex); 373 id = ctx->applied_map_id ? 0 : 1; 374 memcpy(ctx->maps[id].map, user_map, ctx->map_size); 375 ctx->user_map_is_updated = true; 376 mutex_unlock(&ctx->maps_mutex); 377 378 ctx->user_map_is_set = true; 379 break; 380 } 381 382 return 0; 383 } 384
Hi Umang, Thanks for the patch, this feature sounds promising. On 10/22/24 8:31 AM, Umang Jain wrote: > Currently, vertex maps cannot be updated dynamically while dw100 > is streaming. This patch enables the support to update the vertex > map dynamically at runtime. > > To support this functionality, we need to allocate and track two > sets of DMA-allocated vertex maps, one for the currently applied map > and another for the updated (pending) map. Before the start of next > frame, if a new user-supplied vertex map is available, the hardware > mapping is changed to use new vertex map, thus enabling the user to > update the vertex map at runtime. > > We should ensure no race occurs when the vertex map is updated multiple > times when a frame is processing. Hence, vertex map is never updated to > the applied vertex map index in .s_ctrl(). It is always updated on the > pending vertex map slot, with `maps_mutex` lock held. `maps_mutex` lock > is also held when the pending vertex map is applied to the hardware in > dw100_start(). > > Ability to update the vertex map at runtime, enables abritrary rotation > and digital zoom features for the input frames, through the dw100 > hardware. > > Signed-off-by: Umang Jain <umang.jain@ideasonboard.com> > --- > drivers/media/platform/nxp/dw100/dw100.c | 73 ++++++++++++++++++------ > 1 file changed, 56 insertions(+), 17 deletions(-) > > diff --git a/drivers/media/platform/nxp/dw100/dw100.c b/drivers/media/platform/nxp/dw100/dw100.c > index 54ebf59df682..42712ccff754 100644 > --- a/drivers/media/platform/nxp/dw100/dw100.c > +++ b/drivers/media/platform/nxp/dw100/dw100.c > @@ -83,6 +83,11 @@ struct dw100_q_data { > struct v4l2_rect crop; > }; > > +struct dw100_map { > + unsigned int *map; > + dma_addr_t map_dma; > +}; > + > struct dw100_ctx { > struct v4l2_fh fh; > struct dw100_device *dw_dev; > @@ -92,12 +97,14 @@ struct dw100_ctx { > struct mutex vq_mutex; > > /* Look Up Table for pixel remapping */ > - unsigned int *map; > - dma_addr_t map_dma; > + struct dw100_map maps[2]; > + unsigned int applied_map_id; > size_t map_size; > unsigned int map_width; > unsigned int map_height; > bool user_map_is_set; > + bool user_map_is_updated; > + struct mutex maps_mutex; > > /* Source and destination queue data */ > struct dw100_q_data q_data[2]; > @@ -308,24 +315,31 @@ static int dw100_create_mapping(struct dw100_ctx *ctx) > { > u32 *user_map; > > - if (ctx->map) > - dma_free_coherent(&ctx->dw_dev->pdev->dev, ctx->map_size, > - ctx->map, ctx->map_dma); > + for (unsigned int i = 0; i < 2; i++) { > + if (ctx->maps[i].map) > + dma_free_coherent(&ctx->dw_dev->pdev->dev, ctx->map_size, > + ctx->maps[i].map, ctx->maps[i].map_dma); > > - ctx->map = dma_alloc_coherent(&ctx->dw_dev->pdev->dev, ctx->map_size, > - &ctx->map_dma, GFP_KERNEL); > + ctx->maps[i].map = dma_alloc_coherent(&ctx->dw_dev->pdev->dev, ctx->map_size, > + &ctx->maps[i].map_dma, GFP_KERNEL); > > - if (!ctx->map) > - return -ENOMEM; > + if (!ctx->maps[i].map) > + return -ENOMEM; > + } > > user_map = dw100_get_user_map(ctx); > - memcpy(ctx->map, user_map, ctx->map_size); > + > + mutex_lock(&ctx->maps_mutex); > + ctx->applied_map_id = 0; > + memcpy(ctx->maps[ctx->applied_map_id].map, user_map, ctx->map_size); > + mutex_unlock(&ctx->maps_mutex); > > dev_dbg(&ctx->dw_dev->pdev->dev, > "%ux%u %s mapping created (d:%pad-c:%p) for stream %ux%u->%ux%u\n", > ctx->map_width, ctx->map_height, > ctx->user_map_is_set ? "user" : "identity", > - &ctx->map_dma, ctx->map, > + &ctx->maps[ctx->applied_map_id].map_dma, > + ctx->maps[ctx->applied_map_id].map, > ctx->q_data[DW100_QUEUE_SRC].pix_fmt.width, > ctx->q_data[DW100_QUEUE_DST].pix_fmt.height, > ctx->q_data[DW100_QUEUE_SRC].pix_fmt.width, > @@ -336,10 +350,12 @@ static int dw100_create_mapping(struct dw100_ctx *ctx) > > static void dw100_destroy_mapping(struct dw100_ctx *ctx) > { > - if (ctx->map) { > - dma_free_coherent(&ctx->dw_dev->pdev->dev, ctx->map_size, > - ctx->map, ctx->map_dma); > - ctx->map = NULL; > + for (unsigned int i = 0; i < 2; i++) { > + if (ctx->maps[i].map) > + dma_free_coherent(&ctx->dw_dev->pdev->dev, ctx->map_size, > + ctx->maps[i].map, ctx->maps[i].map_dma); > + > + ctx->maps[i].map = NULL; > } > } > > @@ -350,6 +366,15 @@ static int dw100_s_ctrl(struct v4l2_ctrl *ctrl) > > switch (ctrl->id) { > case V4L2_CID_DW100_DEWARPING_16x16_VERTEX_MAP: > + u32 *user_map = ctrl->p_new.p_u32; A warning to fix here. > + unsigned int id; > + > + mutex_lock(&ctx->maps_mutex); > + id = ctx->applied_map_id ? 0 : 1; > + memcpy(ctx->maps[id].map, user_map, ctx->map_size); > + ctx->user_map_is_updated = true; If you call the control before to start the stream, the dma mapping is not yet done(dw100_create_mapping not yet called). Hence, copying the user map to a NULL pointer. > + mutex_unlock(&ctx->maps_mutex); > + > ctx->user_map_is_set = true; > break; > } > @@ -655,6 +680,8 @@ static int dw100_open(struct file *file) > > v4l2_fh_add(&ctx->fh); > > + mutex_init(&ctx->maps_mutex); > + > return 0; > > err: > @@ -675,6 +702,7 @@ static int dw100_release(struct file *file) > v4l2_ctrl_handler_free(&ctx->hdl); > v4l2_m2m_ctx_release(ctx->fh.m2m_ctx); > mutex_destroy(&ctx->vq_mutex); > + mutex_destroy(&ctx->maps_mutex); > kfree(ctx); > > return 0; > @@ -1453,8 +1481,19 @@ static void dw100_start(struct dw100_ctx *ctx, struct vb2_v4l2_buffer *in_vb, > dw100_hw_set_destination(dw_dev, &ctx->q_data[DW100_QUEUE_DST], > ctx->q_data[DW100_QUEUE_SRC].fmt, > &out_vb->vb2_buf); > - dw100_hw_set_mapping(dw_dev, ctx->map_dma, > - ctx->map_width, ctx->map_height); > + > + > + mutex_lock(&ctx->maps_mutex); > + if (ctx->user_map_is_updated) { The hardware register must unconditionally be updated while starting a new context, as a v4l2 m2m supports multi context operations. Otherwise, you may be running with the user mapping used by the previous context. Moreover, the hardware mapping will not be set in case you use the driver as a simple scaler without user mapping, which causes the process to hang as the run does not start and never completes. > + unsigned int id = ctx->applied_map_id ? 0 : 1; > + > + dw100_hw_set_mapping(dw_dev, ctx->maps[id].map_dma, > + ctx->map_width, ctx->map_height); > + ctx->applied_map_id = id; > + ctx->user_map_is_updated = false; > + } > + mutex_unlock(&ctx->maps_mutex); > + > dw100_hw_enable_irq(dw_dev); > dw100_hw_dewarp_start(dw_dev); > It sounds as this patch requires a collaborative application for running well. All my simple tests failed. You can test a simple scaler/pixfmt conversion operation with v4l2 utils: v4l2-ctl \ -d 0 \ --set-fmt-video-out width=640,height=480,pixelformat=NV12,field=none \ --set-fmt-video width=640,height=480,pixelformat=NV21,field=none \ --stream-out-pattern 3 \ --set-selection-output\ target=crop,top=0,left=0,width=640,height=480,flags= \ --stream-count 100 \ --stream-mmap \ --stream-out-mmap Xavier
On Sat, Oct 26, 2024 at 09:52:43PM +0200, Xavier Roumegue wrote: > Hi Umang, > > Thanks for the patch, this feature sounds promising. > > On 10/22/24 8:31 AM, Umang Jain wrote: > > Currently, vertex maps cannot be updated dynamically while dw100 > > is streaming. This patch enables the support to update the vertex > > map dynamically at runtime. > > > > To support this functionality, we need to allocate and track two > > sets of DMA-allocated vertex maps, one for the currently applied map > > and another for the updated (pending) map. Before the start of next > > frame, if a new user-supplied vertex map is available, the hardware > > mapping is changed to use new vertex map, thus enabling the user to > > update the vertex map at runtime. How do you synchronize the new map with the jobs ? That doesn't seem to be supported by the patch, is it a feature that you don't need ? > > > > We should ensure no race occurs when the vertex map is updated multiple > > times when a frame is processing. Hence, vertex map is never updated to > > the applied vertex map index in .s_ctrl(). It is always updated on the > > pending vertex map slot, with `maps_mutex` lock held. `maps_mutex` lock > > is also held when the pending vertex map is applied to the hardware in > > dw100_start(). > > > > Ability to update the vertex map at runtime, enables abritrary rotation s/abritrary/arbitrary/ > > and digital zoom features for the input frames, through the dw100 > > hardware. > > > > Signed-off-by: Umang Jain <umang.jain@ideasonboard.com> > > --- > > drivers/media/platform/nxp/dw100/dw100.c | 73 ++++++++++++++++++------ > > 1 file changed, 56 insertions(+), 17 deletions(-) > > > > diff --git a/drivers/media/platform/nxp/dw100/dw100.c b/drivers/media/platform/nxp/dw100/dw100.c > > index 54ebf59df682..42712ccff754 100644 > > --- a/drivers/media/platform/nxp/dw100/dw100.c > > +++ b/drivers/media/platform/nxp/dw100/dw100.c > > @@ -83,6 +83,11 @@ struct dw100_q_data { > > struct v4l2_rect crop; > > }; > > > > +struct dw100_map { > > + unsigned int *map; > > + dma_addr_t map_dma; I would have called the field just 'dma' as it's already qualified by the structure name or the field name in dw100_ctx. > > +}; > > + > > struct dw100_ctx { > > struct v4l2_fh fh; > > struct dw100_device *dw_dev; > > @@ -92,12 +97,14 @@ struct dw100_ctx { > > struct mutex vq_mutex; > > > > /* Look Up Table for pixel remapping */ > > - unsigned int *map; > > - dma_addr_t map_dma; > > + struct dw100_map maps[2]; > > + unsigned int applied_map_id; > > size_t map_size; > > unsigned int map_width; > > unsigned int map_height; > > bool user_map_is_set; > > + bool user_map_is_updated; > > + struct mutex maps_mutex; > > > > /* Source and destination queue data */ > > struct dw100_q_data q_data[2]; > > @@ -308,24 +315,31 @@ static int dw100_create_mapping(struct dw100_ctx *ctx) > > { > > u32 *user_map; > > > > - if (ctx->map) > > - dma_free_coherent(&ctx->dw_dev->pdev->dev, ctx->map_size, > > - ctx->map, ctx->map_dma); > > + for (unsigned int i = 0; i < 2; i++) { for (unsigned int i = 0; i < ARRAY_SIZE(ctx->maps); i++) { struct dw100_map *map = &ctx->maps[i]; and use map below. > > + if (ctx->maps[i].map) > > + dma_free_coherent(&ctx->dw_dev->pdev->dev, ctx->map_size, > > + ctx->maps[i].map, ctx->maps[i].map_dma); > > > > - ctx->map = dma_alloc_coherent(&ctx->dw_dev->pdev->dev, ctx->map_size, > > - &ctx->map_dma, GFP_KERNEL); > > + ctx->maps[i].map = dma_alloc_coherent(&ctx->dw_dev->pdev->dev, ctx->map_size, > > + &ctx->maps[i].map_dma, GFP_KERNEL); > > > > - if (!ctx->map) > > - return -ENOMEM; > > + if (!ctx->maps[i].map) > > + return -ENOMEM; > > + } > > > > user_map = dw100_get_user_map(ctx); > > - memcpy(ctx->map, user_map, ctx->map_size); > > + > > + mutex_lock(&ctx->maps_mutex); > > + ctx->applied_map_id = 0; > > + memcpy(ctx->maps[ctx->applied_map_id].map, user_map, ctx->map_size); > > + mutex_unlock(&ctx->maps_mutex); > > > > dev_dbg(&ctx->dw_dev->pdev->dev, > > "%ux%u %s mapping created (d:%pad-c:%p) for stream %ux%u->%ux%u\n", > > ctx->map_width, ctx->map_height, > > ctx->user_map_is_set ? "user" : "identity", > > - &ctx->map_dma, ctx->map, > > + &ctx->maps[ctx->applied_map_id].map_dma, > > + ctx->maps[ctx->applied_map_id].map, > > ctx->q_data[DW100_QUEUE_SRC].pix_fmt.width, > > ctx->q_data[DW100_QUEUE_DST].pix_fmt.height, > > ctx->q_data[DW100_QUEUE_SRC].pix_fmt.width, > > @@ -336,10 +350,12 @@ static int dw100_create_mapping(struct dw100_ctx *ctx) > > > > static void dw100_destroy_mapping(struct dw100_ctx *ctx) > > { > > - if (ctx->map) { > > - dma_free_coherent(&ctx->dw_dev->pdev->dev, ctx->map_size, > > - ctx->map, ctx->map_dma); > > - ctx->map = NULL; > > + for (unsigned int i = 0; i < 2; i++) { for (unsigned int i = 0; i < ARRAY_SIZE(ctx->maps); i++) { struct dw100_map *map = &ctx->maps[i]; and use map below. > > + if (ctx->maps[i].map) > > + dma_free_coherent(&ctx->dw_dev->pdev->dev, ctx->map_size, > > + ctx->maps[i].map, ctx->maps[i].map_dma); > > + > > + ctx->maps[i].map = NULL; > > } > > } > > > > @@ -350,6 +366,15 @@ static int dw100_s_ctrl(struct v4l2_ctrl *ctrl) > > > > switch (ctrl->id) { > > case V4L2_CID_DW100_DEWARPING_16x16_VERTEX_MAP: > > + u32 *user_map = ctrl->p_new.p_u32; > > A warning to fix here. > > > + unsigned int id; > > + > > + mutex_lock(&ctx->maps_mutex); > > + id = ctx->applied_map_id ? 0 : 1; > > + memcpy(ctx->maps[id].map, user_map, ctx->map_size); > > + ctx->user_map_is_updated = true; > > If you call the control before to start the stream, the dma mapping is > not yet done(dw100_create_mapping not yet called). Hence, copying the > user map to a NULL pointer. The maps could be allocated in dw100_open() when creating the context. That would likely require moving the initialization of ctx->map_width, ctx->map_height and ctx->map_size as well. The handling of the identity map would probably need to be rewritten too. > > + mutex_unlock(&ctx->maps_mutex); > > + > > ctx->user_map_is_set = true; > > break; > > } > > @@ -655,6 +680,8 @@ static int dw100_open(struct file *file) > > > > v4l2_fh_add(&ctx->fh); > > > > + mutex_init(&ctx->maps_mutex); > > + > > return 0; > > > > err: > > @@ -675,6 +702,7 @@ static int dw100_release(struct file *file) > > v4l2_ctrl_handler_free(&ctx->hdl); > > v4l2_m2m_ctx_release(ctx->fh.m2m_ctx); > > mutex_destroy(&ctx->vq_mutex); > > + mutex_destroy(&ctx->maps_mutex); > > kfree(ctx); > > > > return 0; > > @@ -1453,8 +1481,19 @@ static void dw100_start(struct dw100_ctx *ctx, struct vb2_v4l2_buffer *in_vb, > > dw100_hw_set_destination(dw_dev, &ctx->q_data[DW100_QUEUE_DST], > > ctx->q_data[DW100_QUEUE_SRC].fmt, > > &out_vb->vb2_buf); > > - dw100_hw_set_mapping(dw_dev, ctx->map_dma, > > - ctx->map_width, ctx->map_height); > > + > > + > > + mutex_lock(&ctx->maps_mutex); > > + if (ctx->user_map_is_updated) { > > The hardware register must unconditionally be updated while starting a > new context, as a v4l2 m2m supports multi context operations. Otherwise, > you may be running with the user mapping used by the previous context. > > Moreover, the hardware mapping will not be set in case you use the > driver as a simple scaler without user mapping, which causes the process > to hang as the run does not start and never completes. > > > + unsigned int id = ctx->applied_map_id ? 0 : 1; > > + > > + dw100_hw_set_mapping(dw_dev, ctx->maps[id].map_dma, > > + ctx->map_width, ctx->map_height); > > + ctx->applied_map_id = id; > > + ctx->user_map_is_updated = false; > > + } > > + mutex_unlock(&ctx->maps_mutex); > > + > > dw100_hw_enable_irq(dw_dev); > > dw100_hw_dewarp_start(dw_dev); > > > > It sounds as this patch requires a collaborative application for running > well. All my simple tests failed. > > You can test a simple scaler/pixfmt conversion operation with v4l2 utils: > > > v4l2-ctl \ > -d 0 \ > --set-fmt-video-out width=640,height=480,pixelformat=NV12,field=none \ > --set-fmt-video width=640,height=480,pixelformat=NV21,field=none \ > --stream-out-pattern 3 \ > --set-selection-output\ > target=crop,top=0,left=0,width=640,height=480,flags= \ > --stream-count 100 \ > --stream-mmap \ > --stream-out-mmap
Hi Laurent, On 27/10/24 8:10 pm, Laurent Pinchart wrote: > On Sat, Oct 26, 2024 at 09:52:43PM +0200, Xavier Roumegue wrote: >> Hi Umang, >> >> Thanks for the patch, this feature sounds promising. >> >> On 10/22/24 8:31 AM, Umang Jain wrote: >>> Currently, vertex maps cannot be updated dynamically while dw100 >>> is streaming. This patch enables the support to update the vertex >>> map dynamically at runtime. >>> >>> To support this functionality, we need to allocate and track two >>> sets of DMA-allocated vertex maps, one for the currently applied map >>> and another for the updated (pending) map. Before the start of next >>> frame, if a new user-supplied vertex map is available, the hardware >>> mapping is changed to use new vertex map, thus enabling the user to >>> update the vertex map at runtime. > How do you synchronize the new map with the jobs ? That doesn't seem to > be supported by the patch, is it a feature that you don't need ? First question around running jobs - isn't the DW100 dewarper run with 1 src buffer and 1 dst buffer per context ? Do we need addiitonal synchronisation there? I think same point was mentioned by you for scaler crop setting but maybe I am missing something to see here. From the description of .job_ready(): * @job_ready: optional. Should return 0 if the driver does not have a job * fully prepared to run yet (i.e. it will not be able to finish a * transaction without sleeping). If not provided, it will be * assumed that one source and one destination buffer are all * that is required for the driver to perform one full transaction. * This method may not sleep. And when the IRQ handler completes, it calls to v4l2_m2m_job_finish which then schedules the next job through v4l2_m2m_schedule_next_job() So I assumed that, .device_run() and ... in the IRQ handler (call to v4l2_m2m_job_finish) will be counted as one job transaction - since we are not working with multiple source and destination buffers for one transaction. When the next job is started (i.e. dw100_start()) the vertex map index which is updated, is programmed to the register. That's is why this patch introduced two vertex maps for tracking - one which is applied and other one which can be updated by user. > >>> We should ensure no race occurs when the vertex map is updated multiple >>> times when a frame is processing. Hence, vertex map is never updated to >>> the applied vertex map index in .s_ctrl(). It is always updated on the >>> pending vertex map slot, with `maps_mutex` lock held. `maps_mutex` lock >>> is also held when the pending vertex map is applied to the hardware in >>> dw100_start(). >>> >>> Ability to update the vertex map at runtime, enables abritrary rotation > s/abritrary/arbitrary/ > >>> and digital zoom features for the input frames, through the dw100 >>> hardware. >>> >>> Signed-off-by: Umang Jain <umang.jain@ideasonboard.com> >>> --- >>> drivers/media/platform/nxp/dw100/dw100.c | 73 ++++++++++++++++++------ >>> 1 file changed, 56 insertions(+), 17 deletions(-) >>> >>> diff --git a/drivers/media/platform/nxp/dw100/dw100.c b/drivers/media/platform/nxp/dw100/dw100.c >>> index 54ebf59df682..42712ccff754 100644 >>> --- a/drivers/media/platform/nxp/dw100/dw100.c >>> +++ b/drivers/media/platform/nxp/dw100/dw100.c >>> @@ -83,6 +83,11 @@ struct dw100_q_data { >>> struct v4l2_rect crop; >>> }; >>> >>> +struct dw100_map { >>> + unsigned int *map; >>> + dma_addr_t map_dma; > I would have called the field just 'dma' as it's already qualified by > the structure name or the field name in dw100_ctx. > >>> +}; >>> + >>> struct dw100_ctx { >>> struct v4l2_fh fh; >>> struct dw100_device *dw_dev; >>> @@ -92,12 +97,14 @@ struct dw100_ctx { >>> struct mutex vq_mutex; >>> >>> /* Look Up Table for pixel remapping */ >>> - unsigned int *map; >>> - dma_addr_t map_dma; >>> + struct dw100_map maps[2]; >>> + unsigned int applied_map_id; >>> size_t map_size; >>> unsigned int map_width; >>> unsigned int map_height; >>> bool user_map_is_set; >>> + bool user_map_is_updated; >>> + struct mutex maps_mutex; >>> >>> /* Source and destination queue data */ >>> struct dw100_q_data q_data[2]; >>> @@ -308,24 +315,31 @@ static int dw100_create_mapping(struct dw100_ctx *ctx) >>> { >>> u32 *user_map; >>> >>> - if (ctx->map) >>> - dma_free_coherent(&ctx->dw_dev->pdev->dev, ctx->map_size, >>> - ctx->map, ctx->map_dma); >>> + for (unsigned int i = 0; i < 2; i++) { > for (unsigned int i = 0; i < ARRAY_SIZE(ctx->maps); i++) { > struct dw100_map *map = &ctx->maps[i]; > > and use map below. > > >>> + if (ctx->maps[i].map) >>> + dma_free_coherent(&ctx->dw_dev->pdev->dev, ctx->map_size, >>> + ctx->maps[i].map, ctx->maps[i].map_dma); >>> >>> - ctx->map = dma_alloc_coherent(&ctx->dw_dev->pdev->dev, ctx->map_size, >>> - &ctx->map_dma, GFP_KERNEL); >>> + ctx->maps[i].map = dma_alloc_coherent(&ctx->dw_dev->pdev->dev, ctx->map_size, >>> + &ctx->maps[i].map_dma, GFP_KERNEL); >>> >>> - if (!ctx->map) >>> - return -ENOMEM; >>> + if (!ctx->maps[i].map) >>> + return -ENOMEM; >>> + } >>> >>> user_map = dw100_get_user_map(ctx); >>> - memcpy(ctx->map, user_map, ctx->map_size); >>> + >>> + mutex_lock(&ctx->maps_mutex); >>> + ctx->applied_map_id = 0; >>> + memcpy(ctx->maps[ctx->applied_map_id].map, user_map, ctx->map_size); >>> + mutex_unlock(&ctx->maps_mutex); >>> >>> dev_dbg(&ctx->dw_dev->pdev->dev, >>> "%ux%u %s mapping created (d:%pad-c:%p) for stream %ux%u->%ux%u\n", >>> ctx->map_width, ctx->map_height, >>> ctx->user_map_is_set ? "user" : "identity", >>> - &ctx->map_dma, ctx->map, >>> + &ctx->maps[ctx->applied_map_id].map_dma, >>> + ctx->maps[ctx->applied_map_id].map, >>> ctx->q_data[DW100_QUEUE_SRC].pix_fmt.width, >>> ctx->q_data[DW100_QUEUE_DST].pix_fmt.height, >>> ctx->q_data[DW100_QUEUE_SRC].pix_fmt.width, >>> @@ -336,10 +350,12 @@ static int dw100_create_mapping(struct dw100_ctx *ctx) >>> >>> static void dw100_destroy_mapping(struct dw100_ctx *ctx) >>> { >>> - if (ctx->map) { >>> - dma_free_coherent(&ctx->dw_dev->pdev->dev, ctx->map_size, >>> - ctx->map, ctx->map_dma); >>> - ctx->map = NULL; >>> + for (unsigned int i = 0; i < 2; i++) { > for (unsigned int i = 0; i < ARRAY_SIZE(ctx->maps); i++) { > struct dw100_map *map = &ctx->maps[i]; > > and use map below. > >>> + if (ctx->maps[i].map) >>> + dma_free_coherent(&ctx->dw_dev->pdev->dev, ctx->map_size, >>> + ctx->maps[i].map, ctx->maps[i].map_dma); >>> + >>> + ctx->maps[i].map = NULL; >>> } >>> } >>> >>> @@ -350,6 +366,15 @@ static int dw100_s_ctrl(struct v4l2_ctrl *ctrl) >>> >>> switch (ctrl->id) { >>> case V4L2_CID_DW100_DEWARPING_16x16_VERTEX_MAP: >>> + u32 *user_map = ctrl->p_new.p_u32; >> A warning to fix here. >> >>> + unsigned int id; >>> + >>> + mutex_lock(&ctx->maps_mutex); >>> + id = ctx->applied_map_id ? 0 : 1; >>> + memcpy(ctx->maps[id].map, user_map, ctx->map_size); >>> + ctx->user_map_is_updated = true; >> If you call the control before to start the stream, the dma mapping is >> not yet done(dw100_create_mapping not yet called). Hence, copying the >> user map to a NULL pointer. > The maps could be allocated in dw100_open() when creating the context. > That would likely require moving the initialization of ctx->map_width, > ctx->map_height and ctx->map_size as well. The handling of the identity > map would probably need to be rewritten too. > >>> + mutex_unlock(&ctx->maps_mutex); >>> + >>> ctx->user_map_is_set = true; >>> break; >>> } >>> @@ -655,6 +680,8 @@ static int dw100_open(struct file *file) >>> >>> v4l2_fh_add(&ctx->fh); >>> >>> + mutex_init(&ctx->maps_mutex); >>> + >>> return 0; >>> >>> err: >>> @@ -675,6 +702,7 @@ static int dw100_release(struct file *file) >>> v4l2_ctrl_handler_free(&ctx->hdl); >>> v4l2_m2m_ctx_release(ctx->fh.m2m_ctx); >>> mutex_destroy(&ctx->vq_mutex); >>> + mutex_destroy(&ctx->maps_mutex); >>> kfree(ctx); >>> >>> return 0; >>> @@ -1453,8 +1481,19 @@ static void dw100_start(struct dw100_ctx *ctx, struct vb2_v4l2_buffer *in_vb, >>> dw100_hw_set_destination(dw_dev, &ctx->q_data[DW100_QUEUE_DST], >>> ctx->q_data[DW100_QUEUE_SRC].fmt, >>> &out_vb->vb2_buf); >>> - dw100_hw_set_mapping(dw_dev, ctx->map_dma, >>> - ctx->map_width, ctx->map_height); >>> + >>> + >>> + mutex_lock(&ctx->maps_mutex); >>> + if (ctx->user_map_is_updated) { >> The hardware register must unconditionally be updated while starting a >> new context, as a v4l2 m2m supports multi context operations. Otherwise, >> you may be running with the user mapping used by the previous context. >> >> Moreover, the hardware mapping will not be set in case you use the >> driver as a simple scaler without user mapping, which causes the process >> to hang as the run does not start and never completes. >> >>> + unsigned int id = ctx->applied_map_id ? 0 : 1; >>> + >>> + dw100_hw_set_mapping(dw_dev, ctx->maps[id].map_dma, >>> + ctx->map_width, ctx->map_height); >>> + ctx->applied_map_id = id; >>> + ctx->user_map_is_updated = false; >>> + } >>> + mutex_unlock(&ctx->maps_mutex); >>> + >>> dw100_hw_enable_irq(dw_dev); >>> dw100_hw_dewarp_start(dw_dev); >>> >> It sounds as this patch requires a collaborative application for running >> well. All my simple tests failed. >> >> You can test a simple scaler/pixfmt conversion operation with v4l2 utils: >> >> >> v4l2-ctl \ >> -d 0 \ >> --set-fmt-video-out width=640,height=480,pixelformat=NV12,field=none \ >> --set-fmt-video width=640,height=480,pixelformat=NV21,field=none \ >> --stream-out-pattern 3 \ >> --set-selection-output\ >> target=crop,top=0,left=0,width=640,height=480,flags= \ >> --stream-count 100 \ >> --stream-mmap \ >> --stream-out-mmap
Hi Xavier On 27/10/24 1:22 am, Xavier Roumegue (OSS) wrote: > Hi Umang, > > Thanks for the patch, this feature sounds promising. > > On 10/22/24 8:31 AM, Umang Jain wrote: >> Currently, vertex maps cannot be updated dynamically while dw100 >> is streaming. This patch enables the support to update the vertex >> map dynamically at runtime. >> >> To support this functionality, we need to allocate and track two >> sets of DMA-allocated vertex maps, one for the currently applied map >> and another for the updated (pending) map. Before the start of next >> frame, if a new user-supplied vertex map is available, the hardware >> mapping is changed to use new vertex map, thus enabling the user to >> update the vertex map at runtime. >> >> We should ensure no race occurs when the vertex map is updated multiple >> times when a frame is processing. Hence, vertex map is never updated to >> the applied vertex map index in .s_ctrl(). It is always updated on the >> pending vertex map slot, with `maps_mutex` lock held. `maps_mutex` lock >> is also held when the pending vertex map is applied to the hardware in >> dw100_start(). >> >> Ability to update the vertex map at runtime, enables abritrary rotation >> and digital zoom features for the input frames, through the dw100 >> hardware. >> >> Signed-off-by: Umang Jain <umang.jain@ideasonboard.com> >> --- >> drivers/media/platform/nxp/dw100/dw100.c | 73 ++++++++++++++++++------ >> 1 file changed, 56 insertions(+), 17 deletions(-) >> >> diff --git a/drivers/media/platform/nxp/dw100/dw100.c >> b/drivers/media/platform/nxp/dw100/dw100.c >> index 54ebf59df682..42712ccff754 100644 >> --- a/drivers/media/platform/nxp/dw100/dw100.c >> +++ b/drivers/media/platform/nxp/dw100/dw100.c >> @@ -83,6 +83,11 @@ struct dw100_q_data { >> struct v4l2_rect crop; >> }; >> +struct dw100_map { >> + unsigned int *map; >> + dma_addr_t map_dma; >> +}; >> + >> struct dw100_ctx { >> struct v4l2_fh fh; >> struct dw100_device *dw_dev; >> @@ -92,12 +97,14 @@ struct dw100_ctx { >> struct mutex vq_mutex; >> /* Look Up Table for pixel remapping */ >> - unsigned int *map; >> - dma_addr_t map_dma; >> + struct dw100_map maps[2]; >> + unsigned int applied_map_id; >> size_t map_size; >> unsigned int map_width; >> unsigned int map_height; >> bool user_map_is_set; >> + bool user_map_is_updated; >> + struct mutex maps_mutex; >> /* Source and destination queue data */ >> struct dw100_q_data q_data[2]; >> @@ -308,24 +315,31 @@ static int dw100_create_mapping(struct >> dw100_ctx *ctx) >> { >> u32 *user_map; >> - if (ctx->map) >> - dma_free_coherent(&ctx->dw_dev->pdev->dev, ctx->map_size, >> - ctx->map, ctx->map_dma); >> + for (unsigned int i = 0; i < 2; i++) { >> + if (ctx->maps[i].map) >> + dma_free_coherent(&ctx->dw_dev->pdev->dev, ctx->map_size, >> + ctx->maps[i].map, ctx->maps[i].map_dma); >> - ctx->map = dma_alloc_coherent(&ctx->dw_dev->pdev->dev, >> ctx->map_size, >> - &ctx->map_dma, GFP_KERNEL); >> + ctx->maps[i].map = >> dma_alloc_coherent(&ctx->dw_dev->pdev->dev, ctx->map_size, >> + &ctx->maps[i].map_dma, GFP_KERNEL); >> - if (!ctx->map) >> - return -ENOMEM; >> + if (!ctx->maps[i].map) >> + return -ENOMEM; >> + } >> user_map = dw100_get_user_map(ctx); >> - memcpy(ctx->map, user_map, ctx->map_size); >> + >> + mutex_lock(&ctx->maps_mutex); >> + ctx->applied_map_id = 0; >> + memcpy(ctx->maps[ctx->applied_map_id].map, user_map, >> ctx->map_size); >> + mutex_unlock(&ctx->maps_mutex); >> dev_dbg(&ctx->dw_dev->pdev->dev, >> "%ux%u %s mapping created (d:%pad-c:%p) for stream >> %ux%u->%ux%u\n", >> ctx->map_width, ctx->map_height, >> ctx->user_map_is_set ? "user" : "identity", >> - &ctx->map_dma, ctx->map, >> + &ctx->maps[ctx->applied_map_id].map_dma, >> + ctx->maps[ctx->applied_map_id].map, >> ctx->q_data[DW100_QUEUE_SRC].pix_fmt.width, >> ctx->q_data[DW100_QUEUE_DST].pix_fmt.height, >> ctx->q_data[DW100_QUEUE_SRC].pix_fmt.width, >> @@ -336,10 +350,12 @@ static int dw100_create_mapping(struct >> dw100_ctx *ctx) >> static void dw100_destroy_mapping(struct dw100_ctx *ctx) >> { >> - if (ctx->map) { >> - dma_free_coherent(&ctx->dw_dev->pdev->dev, ctx->map_size, >> - ctx->map, ctx->map_dma); >> - ctx->map = NULL; >> + for (unsigned int i = 0; i < 2; i++) { >> + if (ctx->maps[i].map) >> + dma_free_coherent(&ctx->dw_dev->pdev->dev, ctx->map_size, >> + ctx->maps[i].map, ctx->maps[i].map_dma); >> + >> + ctx->maps[i].map = NULL; >> } >> } >> @@ -350,6 +366,15 @@ static int dw100_s_ctrl(struct v4l2_ctrl *ctrl) >> switch (ctrl->id) { >> case V4L2_CID_DW100_DEWARPING_16x16_VERTEX_MAP: >> + u32 *user_map = ctrl->p_new.p_u32; > A warning to fix here. >> + unsigned int id; >> + >> + mutex_lock(&ctx->maps_mutex); >> + id = ctx->applied_map_id ? 0 : 1; >> + memcpy(ctx->maps[id].map, user_map, ctx->map_size); >> + ctx->user_map_is_updated = true; > If you call the control before to start the stream, the dma mapping is > not yet done(dw100_create_mapping not yet called). Hence, copying the > user map to a NULL pointer. >> + mutex_unlock(&ctx->maps_mutex); >> + >> ctx->user_map_is_set = true; >> break; >> } >> @@ -655,6 +680,8 @@ static int dw100_open(struct file *file) >> v4l2_fh_add(&ctx->fh); >> + mutex_init(&ctx->maps_mutex); >> + >> return 0; >> err: >> @@ -675,6 +702,7 @@ static int dw100_release(struct file *file) >> v4l2_ctrl_handler_free(&ctx->hdl); >> v4l2_m2m_ctx_release(ctx->fh.m2m_ctx); >> mutex_destroy(&ctx->vq_mutex); >> + mutex_destroy(&ctx->maps_mutex); >> kfree(ctx); >> return 0; >> @@ -1453,8 +1481,19 @@ static void dw100_start(struct dw100_ctx *ctx, >> struct vb2_v4l2_buffer *in_vb, >> dw100_hw_set_destination(dw_dev, &ctx->q_data[DW100_QUEUE_DST], >> ctx->q_data[DW100_QUEUE_SRC].fmt, >> &out_vb->vb2_buf); >> - dw100_hw_set_mapping(dw_dev, ctx->map_dma, >> - ctx->map_width, ctx->map_height); >> + >> + >> + mutex_lock(&ctx->maps_mutex); >> + if (ctx->user_map_is_updated) { > The hardware register must unconditionally be updated while starting a > new context, as a v4l2 m2m supports multi context operations. > Otherwise, you may be running with the user mapping used by the > previous context. Indeed, I missed to take into multi-context view point into account and indeed there can be some contexts which have not set the user map - user_map_is_updated=false. > > Moreover, the hardware mapping will not be set in case you use the > driver as a simple scaler without user mapping, which causes the > process to hang as the run does not start and never completes. Hence, I am noticing hangs right now, so I would update this in v2. >> + unsigned int id = ctx->applied_map_id ? 0 : 1; >> + >> + dw100_hw_set_mapping(dw_dev, ctx->maps[id].map_dma, >> + ctx->map_width, ctx->map_height); >> + ctx->applied_map_id = id; >> + ctx->user_map_is_updated = false; >> + } >> + mutex_unlock(&ctx->maps_mutex); >> + >> dw100_hw_enable_irq(dw_dev); >> dw100_hw_dewarp_start(dw_dev); > > It sounds as this patch requires a collaborative application for > running well. All my simple tests failed. I think we have tested Zoom/Rotate with this patch running (i.e. user maps being updated) and seeing the effect visually. > > You can test a simple scaler/pixfmt conversion operation with v4l2 utils: I'll check this as well before submitting for v2. > > > v4l2-ctl \ > -d 0 \ > --set-fmt-video-out width=640,height=480,pixelformat=NV12,field=none \ > --set-fmt-video width=640,height=480,pixelformat=NV21,field=none \ > --stream-out-pattern 3 \ > --set-selection-output\ > target=crop,top=0,left=0,width=640,height=480,flags= \ > --stream-count 100 \ > --stream-mmap \ > --stream-out-mmap > > Xavier
Hi Laurent On 27/10/24 8:10 pm, Laurent Pinchart wrote: > On Sat, Oct 26, 2024 at 09:52:43PM +0200, Xavier Roumegue wrote: >> Hi Umang, >> >> Thanks for the patch, this feature sounds promising. >> >> On 10/22/24 8:31 AM, Umang Jain wrote: >>> Currently, vertex maps cannot be updated dynamically while dw100 >>> is streaming. This patch enables the support to update the vertex >>> map dynamically at runtime. >>> >>> To support this functionality, we need to allocate and track two >>> sets of DMA-allocated vertex maps, one for the currently applied map >>> and another for the updated (pending) map. Before the start of next >>> frame, if a new user-supplied vertex map is available, the hardware >>> mapping is changed to use new vertex map, thus enabling the user to >>> update the vertex map at runtime. > How do you synchronize the new map with the jobs ? That doesn't seem to > be supported by the patch, is it a feature that you don't need ? > >>> We should ensure no race occurs when the vertex map is updated multiple >>> times when a frame is processing. Hence, vertex map is never updated to >>> the applied vertex map index in .s_ctrl(). It is always updated on the >>> pending vertex map slot, with `maps_mutex` lock held. `maps_mutex` lock >>> is also held when the pending vertex map is applied to the hardware in >>> dw100_start(). >>> >>> Ability to update the vertex map at runtime, enables abritrary rotation > s/abritrary/arbitrary/ > >>> and digital zoom features for the input frames, through the dw100 >>> hardware. >>> >>> Signed-off-by: Umang Jain <umang.jain@ideasonboard.com> >>> --- >>> drivers/media/platform/nxp/dw100/dw100.c | 73 ++++++++++++++++++------ >>> 1 file changed, 56 insertions(+), 17 deletions(-) >>> >>> diff --git a/drivers/media/platform/nxp/dw100/dw100.c b/drivers/media/platform/nxp/dw100/dw100.c >>> index 54ebf59df682..42712ccff754 100644 >>> --- a/drivers/media/platform/nxp/dw100/dw100.c >>> +++ b/drivers/media/platform/nxp/dw100/dw100.c >>> @@ -83,6 +83,11 @@ struct dw100_q_data { >>> struct v4l2_rect crop; >>> }; >>> >>> +struct dw100_map { >>> + unsigned int *map; >>> + dma_addr_t map_dma; > I would have called the field just 'dma' as it's already qualified by > the structure name or the field name in dw100_ctx. > >>> +}; >>> + >>> struct dw100_ctx { >>> struct v4l2_fh fh; >>> struct dw100_device *dw_dev; >>> @@ -92,12 +97,14 @@ struct dw100_ctx { >>> struct mutex vq_mutex; >>> >>> /* Look Up Table for pixel remapping */ >>> - unsigned int *map; >>> - dma_addr_t map_dma; >>> + struct dw100_map maps[2]; >>> + unsigned int applied_map_id; >>> size_t map_size; >>> unsigned int map_width; >>> unsigned int map_height; >>> bool user_map_is_set; >>> + bool user_map_is_updated; >>> + struct mutex maps_mutex; >>> >>> /* Source and destination queue data */ >>> struct dw100_q_data q_data[2]; >>> @@ -308,24 +315,31 @@ static int dw100_create_mapping(struct dw100_ctx *ctx) >>> { >>> u32 *user_map; >>> >>> - if (ctx->map) >>> - dma_free_coherent(&ctx->dw_dev->pdev->dev, ctx->map_size, >>> - ctx->map, ctx->map_dma); >>> + for (unsigned int i = 0; i < 2; i++) { > for (unsigned int i = 0; i < ARRAY_SIZE(ctx->maps); i++) { > struct dw100_map *map = &ctx->maps[i]; > > and use map below. > > >>> + if (ctx->maps[i].map) >>> + dma_free_coherent(&ctx->dw_dev->pdev->dev, ctx->map_size, >>> + ctx->maps[i].map, ctx->maps[i].map_dma); >>> >>> - ctx->map = dma_alloc_coherent(&ctx->dw_dev->pdev->dev, ctx->map_size, >>> - &ctx->map_dma, GFP_KERNEL); >>> + ctx->maps[i].map = dma_alloc_coherent(&ctx->dw_dev->pdev->dev, ctx->map_size, >>> + &ctx->maps[i].map_dma, GFP_KERNEL); >>> >>> - if (!ctx->map) >>> - return -ENOMEM; >>> + if (!ctx->maps[i].map) >>> + return -ENOMEM; >>> + } >>> >>> user_map = dw100_get_user_map(ctx); >>> - memcpy(ctx->map, user_map, ctx->map_size); >>> + >>> + mutex_lock(&ctx->maps_mutex); >>> + ctx->applied_map_id = 0; >>> + memcpy(ctx->maps[ctx->applied_map_id].map, user_map, ctx->map_size); >>> + mutex_unlock(&ctx->maps_mutex); >>> >>> dev_dbg(&ctx->dw_dev->pdev->dev, >>> "%ux%u %s mapping created (d:%pad-c:%p) for stream %ux%u->%ux%u\n", >>> ctx->map_width, ctx->map_height, >>> ctx->user_map_is_set ? "user" : "identity", >>> - &ctx->map_dma, ctx->map, >>> + &ctx->maps[ctx->applied_map_id].map_dma, >>> + ctx->maps[ctx->applied_map_id].map, >>> ctx->q_data[DW100_QUEUE_SRC].pix_fmt.width, >>> ctx->q_data[DW100_QUEUE_DST].pix_fmt.height, >>> ctx->q_data[DW100_QUEUE_SRC].pix_fmt.width, >>> @@ -336,10 +350,12 @@ static int dw100_create_mapping(struct dw100_ctx *ctx) >>> >>> static void dw100_destroy_mapping(struct dw100_ctx *ctx) >>> { >>> - if (ctx->map) { >>> - dma_free_coherent(&ctx->dw_dev->pdev->dev, ctx->map_size, >>> - ctx->map, ctx->map_dma); >>> - ctx->map = NULL; >>> + for (unsigned int i = 0; i < 2; i++) { > for (unsigned int i = 0; i < ARRAY_SIZE(ctx->maps); i++) { > struct dw100_map *map = &ctx->maps[i]; > > and use map below. > >>> + if (ctx->maps[i].map) >>> + dma_free_coherent(&ctx->dw_dev->pdev->dev, ctx->map_size, >>> + ctx->maps[i].map, ctx->maps[i].map_dma); >>> + >>> + ctx->maps[i].map = NULL; >>> } >>> } >>> >>> @@ -350,6 +366,15 @@ static int dw100_s_ctrl(struct v4l2_ctrl *ctrl) >>> >>> switch (ctrl->id) { >>> case V4L2_CID_DW100_DEWARPING_16x16_VERTEX_MAP: >>> + u32 *user_map = ctrl->p_new.p_u32; >> A warning to fix here. >> >>> + unsigned int id; >>> + >>> + mutex_lock(&ctx->maps_mutex); >>> + id = ctx->applied_map_id ? 0 : 1; >>> + memcpy(ctx->maps[id].map, user_map, ctx->map_size); >>> + ctx->user_map_is_updated = true; >> If you call the control before to start the stream, the dma mapping is >> not yet done(dw100_create_mapping not yet called). Hence, copying the >> user map to a NULL pointer. > The maps could be allocated in dw100_open() when creating the context. > That would likely require moving the initialization of ctx->map_width, > ctx->map_height and ctx->map_size as well. The handling of the identity > map would probably need to be rewritten too. The ctx->map_width, ctx->map_height and ctx->map_size would be updated on s_fmt(). I think we can solve the NULL pointer issue by allocating when creating the context (open()), however, it would require updating (re-allocation) again before the map can be memcpy()ed before streaming. Because the map dimensions would have changed. See dw100_s_fmt() ... dims[0] = dw100_get_n_vertices_from_length(q_data->pix_fmt.width); dims[1] = dw100_get_n_vertices_from_length(q_data->pix_fmt.height); ret = v4l2_ctrl_modify_dimensions(ctrl, dims); ``` I checked the v4l2_ctrl_modify_dimensions definition to check if it issues a call v4l2_ctrl_type_ops.init (where the map dimensions are updated for dw100) and it does. So, I think I will have to introduce allocations in dw100_open() so that NULL pointer issue doesn't occur and let the dma allocation get re-allocated with new dimensions just before stream start. Also, we do not have to move the ctx->map_width, ctx->height abd ctx->map_size inititlisation, since they are already gets initialised to defaults, on the open() path when v4l2_ctrl_new_custom() is done. >>> + mutex_unlock(&ctx->maps_mutex); >>> + >>> ctx->user_map_is_set = true; >>> break; >>> } >>> @@ -655,6 +680,8 @@ static int dw100_open(struct file *file) >>> >>> v4l2_fh_add(&ctx->fh); >>> >>> + mutex_init(&ctx->maps_mutex); >>> + >>> return 0; >>> >>> err: >>> @@ -675,6 +702,7 @@ static int dw100_release(struct file *file) >>> v4l2_ctrl_handler_free(&ctx->hdl); >>> v4l2_m2m_ctx_release(ctx->fh.m2m_ctx); >>> mutex_destroy(&ctx->vq_mutex); >>> + mutex_destroy(&ctx->maps_mutex); >>> kfree(ctx); >>> >>> return 0; >>> @@ -1453,8 +1481,19 @@ static void dw100_start(struct dw100_ctx *ctx, struct vb2_v4l2_buffer *in_vb, >>> dw100_hw_set_destination(dw_dev, &ctx->q_data[DW100_QUEUE_DST], >>> ctx->q_data[DW100_QUEUE_SRC].fmt, >>> &out_vb->vb2_buf); >>> - dw100_hw_set_mapping(dw_dev, ctx->map_dma, >>> - ctx->map_width, ctx->map_height); >>> + >>> + >>> + mutex_lock(&ctx->maps_mutex); >>> + if (ctx->user_map_is_updated) { >> The hardware register must unconditionally be updated while starting a >> new context, as a v4l2 m2m supports multi context operations. Otherwise, >> you may be running with the user mapping used by the previous context. >> >> Moreover, the hardware mapping will not be set in case you use the >> driver as a simple scaler without user mapping, which causes the process >> to hang as the run does not start and never completes. >> >>> + unsigned int id = ctx->applied_map_id ? 0 : 1; >>> + >>> + dw100_hw_set_mapping(dw_dev, ctx->maps[id].map_dma, >>> + ctx->map_width, ctx->map_height); >>> + ctx->applied_map_id = id; >>> + ctx->user_map_is_updated = false; >>> + } >>> + mutex_unlock(&ctx->maps_mutex); >>> + >>> dw100_hw_enable_irq(dw_dev); >>> dw100_hw_dewarp_start(dw_dev); >>> >> It sounds as this patch requires a collaborative application for running >> well. All my simple tests failed. >> >> You can test a simple scaler/pixfmt conversion operation with v4l2 utils: >> >> >> v4l2-ctl \ >> -d 0 \ >> --set-fmt-video-out width=640,height=480,pixelformat=NV12,field=none \ >> --set-fmt-video width=640,height=480,pixelformat=NV21,field=none \ >> --stream-out-pattern 3 \ >> --set-selection-output\ >> target=crop,top=0,left=0,width=640,height=480,flags= \ >> --stream-count 100 \ >> --stream-mmap \ >> --stream-out-mmap
Hi Umang, On Mon, Oct 28, 2024 at 12:57:52PM +0530, Umang Jain wrote: > On 27/10/24 8:10 pm, Laurent Pinchart wrote: > > On Sat, Oct 26, 2024 at 09:52:43PM +0200, Xavier Roumegue wrote: > >> On 10/22/24 8:31 AM, Umang Jain wrote: > >>> Currently, vertex maps cannot be updated dynamically while dw100 > >>> is streaming. This patch enables the support to update the vertex > >>> map dynamically at runtime. > >>> > >>> To support this functionality, we need to allocate and track two > >>> sets of DMA-allocated vertex maps, one for the currently applied map > >>> and another for the updated (pending) map. Before the start of next > >>> frame, if a new user-supplied vertex map is available, the hardware > >>> mapping is changed to use new vertex map, thus enabling the user to > >>> update the vertex map at runtime. > > > > How do you synchronize the new map with the jobs ? That doesn't seem to > > be supported by the patch, is it a feature that you don't need ? > > First question around running jobs - isn't the DW100 dewarper run with 1 > src buffer and 1 dst buffer per context ? Do we need addiitonal > synchronisation there? I think same point was mentioned by you for > scaler crop setting but maybe I am missing something to see here. > > From the description of .job_ready(): > > * @job_ready: optional. Should return 0 if the driver does not have a job > * fully prepared to run yet (i.e. it will not be able to finish a > * transaction without sleeping). If not provided, it will be > * assumed that one source and one destination buffer are all > * that is required for the driver to perform one full transaction. > * This method may not sleep. > > And when the IRQ handler completes, it calls to v4l2_m2m_job_finish > which then schedules the next job through v4l2_m2m_schedule_next_job() > > So I assumed that, .device_run() and ... in the IRQ handler (call > to v4l2_m2m_job_finish) will be counted as one job transaction - since > we are not working with multiple source and destination buffers for one > transaction. Correct, but userspace can queue multiple jobs by queuing multiple output and capture buffers, one of each per job. It doesn't have to wait for the completion of a job before starting the next one. > When the next job is started (i.e. dw100_start()) the vertex map index > which is updated, is programmed to the register. That's is why this > patch introduced two vertex maps for tracking - one which is applied and > other one which can be updated by user. When multiple jobs are queued, setting the control will become asynchronous relative to the jobs, you won't know to which job the new map applies. This is due to the asynchronous nature of V4L2 controls. The way to synchronize controls with jobs would be to use the request API, which adds complexity. Another option is to avoid queuing multiple jobs, which is a bit of a workaround that results in reduce throughput. What I wonder, and would like to have your feedback on, is whether synchronous operation is needed in some of the DW100 use cases (and in particular in your use cases). > >>> We should ensure no race occurs when the vertex map is updated multiple > >>> times when a frame is processing. Hence, vertex map is never updated to > >>> the applied vertex map index in .s_ctrl(). It is always updated on the > >>> pending vertex map slot, with `maps_mutex` lock held. `maps_mutex` lock > >>> is also held when the pending vertex map is applied to the hardware in > >>> dw100_start(). > >>> > >>> Ability to update the vertex map at runtime, enables abritrary rotation > > > > s/abritrary/arbitrary/ > > > >>> and digital zoom features for the input frames, through the dw100 > >>> hardware. > >>> > >>> Signed-off-by: Umang Jain <umang.jain@ideasonboard.com> > >>> --- > >>> drivers/media/platform/nxp/dw100/dw100.c | 73 ++++++++++++++++++------ > >>> 1 file changed, 56 insertions(+), 17 deletions(-) > >>> > >>> diff --git a/drivers/media/platform/nxp/dw100/dw100.c b/drivers/media/platform/nxp/dw100/dw100.c > >>> index 54ebf59df682..42712ccff754 100644 > >>> --- a/drivers/media/platform/nxp/dw100/dw100.c > >>> +++ b/drivers/media/platform/nxp/dw100/dw100.c > >>> @@ -83,6 +83,11 @@ struct dw100_q_data { > >>> struct v4l2_rect crop; > >>> }; > >>> > >>> +struct dw100_map { > >>> + unsigned int *map; > >>> + dma_addr_t map_dma; > > > > I would have called the field just 'dma' as it's already qualified by > > the structure name or the field name in dw100_ctx. > > > >>> +}; > >>> + > >>> struct dw100_ctx { > >>> struct v4l2_fh fh; > >>> struct dw100_device *dw_dev; > >>> @@ -92,12 +97,14 @@ struct dw100_ctx { > >>> struct mutex vq_mutex; > >>> > >>> /* Look Up Table for pixel remapping */ > >>> - unsigned int *map; > >>> - dma_addr_t map_dma; > >>> + struct dw100_map maps[2]; > >>> + unsigned int applied_map_id; > >>> size_t map_size; > >>> unsigned int map_width; > >>> unsigned int map_height; > >>> bool user_map_is_set; > >>> + bool user_map_is_updated; > >>> + struct mutex maps_mutex; > >>> > >>> /* Source and destination queue data */ > >>> struct dw100_q_data q_data[2]; > >>> @@ -308,24 +315,31 @@ static int dw100_create_mapping(struct dw100_ctx *ctx) > >>> { > >>> u32 *user_map; > >>> > >>> - if (ctx->map) > >>> - dma_free_coherent(&ctx->dw_dev->pdev->dev, ctx->map_size, > >>> - ctx->map, ctx->map_dma); > >>> + for (unsigned int i = 0; i < 2; i++) { > > > > for (unsigned int i = 0; i < ARRAY_SIZE(ctx->maps); i++) { > > struct dw100_map *map = &ctx->maps[i]; > > > > and use map below. > > > > > >>> + if (ctx->maps[i].map) > >>> + dma_free_coherent(&ctx->dw_dev->pdev->dev, ctx->map_size, > >>> + ctx->maps[i].map, ctx->maps[i].map_dma); > >>> > >>> - ctx->map = dma_alloc_coherent(&ctx->dw_dev->pdev->dev, ctx->map_size, > >>> - &ctx->map_dma, GFP_KERNEL); > >>> + ctx->maps[i].map = dma_alloc_coherent(&ctx->dw_dev->pdev->dev, ctx->map_size, > >>> + &ctx->maps[i].map_dma, GFP_KERNEL); > >>> > >>> - if (!ctx->map) > >>> - return -ENOMEM; > >>> + if (!ctx->maps[i].map) > >>> + return -ENOMEM; > >>> + } > >>> > >>> user_map = dw100_get_user_map(ctx); > >>> - memcpy(ctx->map, user_map, ctx->map_size); > >>> + > >>> + mutex_lock(&ctx->maps_mutex); > >>> + ctx->applied_map_id = 0; > >>> + memcpy(ctx->maps[ctx->applied_map_id].map, user_map, ctx->map_size); > >>> + mutex_unlock(&ctx->maps_mutex); > >>> > >>> dev_dbg(&ctx->dw_dev->pdev->dev, > >>> "%ux%u %s mapping created (d:%pad-c:%p) for stream %ux%u->%ux%u\n", > >>> ctx->map_width, ctx->map_height, > >>> ctx->user_map_is_set ? "user" : "identity", > >>> - &ctx->map_dma, ctx->map, > >>> + &ctx->maps[ctx->applied_map_id].map_dma, > >>> + ctx->maps[ctx->applied_map_id].map, > >>> ctx->q_data[DW100_QUEUE_SRC].pix_fmt.width, > >>> ctx->q_data[DW100_QUEUE_DST].pix_fmt.height, > >>> ctx->q_data[DW100_QUEUE_SRC].pix_fmt.width, > >>> @@ -336,10 +350,12 @@ static int dw100_create_mapping(struct dw100_ctx *ctx) > >>> > >>> static void dw100_destroy_mapping(struct dw100_ctx *ctx) > >>> { > >>> - if (ctx->map) { > >>> - dma_free_coherent(&ctx->dw_dev->pdev->dev, ctx->map_size, > >>> - ctx->map, ctx->map_dma); > >>> - ctx->map = NULL; > >>> + for (unsigned int i = 0; i < 2; i++) { > > > > for (unsigned int i = 0; i < ARRAY_SIZE(ctx->maps); i++) { > > struct dw100_map *map = &ctx->maps[i]; > > > > and use map below. > > > >>> + if (ctx->maps[i].map) > >>> + dma_free_coherent(&ctx->dw_dev->pdev->dev, ctx->map_size, > >>> + ctx->maps[i].map, ctx->maps[i].map_dma); > >>> + > >>> + ctx->maps[i].map = NULL; > >>> } > >>> } > >>> > >>> @@ -350,6 +366,15 @@ static int dw100_s_ctrl(struct v4l2_ctrl *ctrl) > >>> > >>> switch (ctrl->id) { > >>> case V4L2_CID_DW100_DEWARPING_16x16_VERTEX_MAP: > >>> + u32 *user_map = ctrl->p_new.p_u32; > >> > >> A warning to fix here. > >> > >>> + unsigned int id; > >>> + > >>> + mutex_lock(&ctx->maps_mutex); > >>> + id = ctx->applied_map_id ? 0 : 1; > >>> + memcpy(ctx->maps[id].map, user_map, ctx->map_size); > >>> + ctx->user_map_is_updated = true; > >> > >> If you call the control before to start the stream, the dma mapping is > >> not yet done(dw100_create_mapping not yet called). Hence, copying the > >> user map to a NULL pointer. > > > > The maps could be allocated in dw100_open() when creating the context. > > That would likely require moving the initialization of ctx->map_width, > > ctx->map_height and ctx->map_size as well. The handling of the identity > > map would probably need to be rewritten too. > > > >>> + mutex_unlock(&ctx->maps_mutex); > >>> + > >>> ctx->user_map_is_set = true; > >>> break; > >>> } > >>> @@ -655,6 +680,8 @@ static int dw100_open(struct file *file) > >>> > >>> v4l2_fh_add(&ctx->fh); > >>> > >>> + mutex_init(&ctx->maps_mutex); > >>> + > >>> return 0; > >>> > >>> err: > >>> @@ -675,6 +702,7 @@ static int dw100_release(struct file *file) > >>> v4l2_ctrl_handler_free(&ctx->hdl); > >>> v4l2_m2m_ctx_release(ctx->fh.m2m_ctx); > >>> mutex_destroy(&ctx->vq_mutex); > >>> + mutex_destroy(&ctx->maps_mutex); > >>> kfree(ctx); > >>> > >>> return 0; > >>> @@ -1453,8 +1481,19 @@ static void dw100_start(struct dw100_ctx *ctx, struct vb2_v4l2_buffer *in_vb, > >>> dw100_hw_set_destination(dw_dev, &ctx->q_data[DW100_QUEUE_DST], > >>> ctx->q_data[DW100_QUEUE_SRC].fmt, > >>> &out_vb->vb2_buf); > >>> - dw100_hw_set_mapping(dw_dev, ctx->map_dma, > >>> - ctx->map_width, ctx->map_height); > >>> + > >>> + > >>> + mutex_lock(&ctx->maps_mutex); > >>> + if (ctx->user_map_is_updated) { > >> > >> The hardware register must unconditionally be updated while starting a > >> new context, as a v4l2 m2m supports multi context operations. Otherwise, > >> you may be running with the user mapping used by the previous context. > >> > >> Moreover, the hardware mapping will not be set in case you use the > >> driver as a simple scaler without user mapping, which causes the process > >> to hang as the run does not start and never completes. > >> > >>> + unsigned int id = ctx->applied_map_id ? 0 : 1; > >>> + > >>> + dw100_hw_set_mapping(dw_dev, ctx->maps[id].map_dma, > >>> + ctx->map_width, ctx->map_height); > >>> + ctx->applied_map_id = id; > >>> + ctx->user_map_is_updated = false; > >>> + } > >>> + mutex_unlock(&ctx->maps_mutex); > >>> + > >>> dw100_hw_enable_irq(dw_dev); > >>> dw100_hw_dewarp_start(dw_dev); > >>> > >> It sounds as this patch requires a collaborative application for running > >> well. All my simple tests failed. > >> > >> You can test a simple scaler/pixfmt conversion operation with v4l2 utils: > >> > >> > >> v4l2-ctl \ > >> -d 0 \ > >> --set-fmt-video-out width=640,height=480,pixelformat=NV12,field=none \ > >> --set-fmt-video width=640,height=480,pixelformat=NV21,field=none \ > >> --stream-out-pattern 3 \ > >> --set-selection-output\ > >> target=crop,top=0,left=0,width=640,height=480,flags= \ > >> --stream-count 100 \ > >> --stream-mmap \ > >> --stream-out-mmap
Hi Umang, On Mon, Oct 28, 2024 at 07:47:46PM +0530, Umang Jain wrote: > On 27/10/24 8:10 pm, Laurent Pinchart wrote: > > On Sat, Oct 26, 2024 at 09:52:43PM +0200, Xavier Roumegue wrote: > >> On 10/22/24 8:31 AM, Umang Jain wrote: > >>> Currently, vertex maps cannot be updated dynamically while dw100 > >>> is streaming. This patch enables the support to update the vertex > >>> map dynamically at runtime. > >>> > >>> To support this functionality, we need to allocate and track two > >>> sets of DMA-allocated vertex maps, one for the currently applied map > >>> and another for the updated (pending) map. Before the start of next > >>> frame, if a new user-supplied vertex map is available, the hardware > >>> mapping is changed to use new vertex map, thus enabling the user to > >>> update the vertex map at runtime. > > > > How do you synchronize the new map with the jobs ? That doesn't seem to > > be supported by the patch, is it a feature that you don't need ? > > > >>> We should ensure no race occurs when the vertex map is updated multiple > >>> times when a frame is processing. Hence, vertex map is never updated to > >>> the applied vertex map index in .s_ctrl(). It is always updated on the > >>> pending vertex map slot, with `maps_mutex` lock held. `maps_mutex` lock > >>> is also held when the pending vertex map is applied to the hardware in > >>> dw100_start(). > >>> > >>> Ability to update the vertex map at runtime, enables abritrary rotation > > > > s/abritrary/arbitrary/ > > > >>> and digital zoom features for the input frames, through the dw100 > >>> hardware. > >>> > >>> Signed-off-by: Umang Jain <umang.jain@ideasonboard.com> > >>> --- > >>> drivers/media/platform/nxp/dw100/dw100.c | 73 ++++++++++++++++++------ > >>> 1 file changed, 56 insertions(+), 17 deletions(-) > >>> > >>> diff --git a/drivers/media/platform/nxp/dw100/dw100.c b/drivers/media/platform/nxp/dw100/dw100.c > >>> index 54ebf59df682..42712ccff754 100644 > >>> --- a/drivers/media/platform/nxp/dw100/dw100.c > >>> +++ b/drivers/media/platform/nxp/dw100/dw100.c > >>> @@ -83,6 +83,11 @@ struct dw100_q_data { > >>> struct v4l2_rect crop; > >>> }; > >>> > >>> +struct dw100_map { > >>> + unsigned int *map; > >>> + dma_addr_t map_dma; > > > > I would have called the field just 'dma' as it's already qualified by > > the structure name or the field name in dw100_ctx. > > > >>> +}; > >>> + > >>> struct dw100_ctx { > >>> struct v4l2_fh fh; > >>> struct dw100_device *dw_dev; > >>> @@ -92,12 +97,14 @@ struct dw100_ctx { > >>> struct mutex vq_mutex; > >>> > >>> /* Look Up Table for pixel remapping */ > >>> - unsigned int *map; > >>> - dma_addr_t map_dma; > >>> + struct dw100_map maps[2]; > >>> + unsigned int applied_map_id; > >>> size_t map_size; > >>> unsigned int map_width; > >>> unsigned int map_height; > >>> bool user_map_is_set; > >>> + bool user_map_is_updated; > >>> + struct mutex maps_mutex; > >>> > >>> /* Source and destination queue data */ > >>> struct dw100_q_data q_data[2]; > >>> @@ -308,24 +315,31 @@ static int dw100_create_mapping(struct dw100_ctx *ctx) > >>> { > >>> u32 *user_map; > >>> > >>> - if (ctx->map) > >>> - dma_free_coherent(&ctx->dw_dev->pdev->dev, ctx->map_size, > >>> - ctx->map, ctx->map_dma); > >>> + for (unsigned int i = 0; i < 2; i++) { > > > > for (unsigned int i = 0; i < ARRAY_SIZE(ctx->maps); i++) { > > struct dw100_map *map = &ctx->maps[i]; > > > > and use map below. > > > > > >>> + if (ctx->maps[i].map) > >>> + dma_free_coherent(&ctx->dw_dev->pdev->dev, ctx->map_size, > >>> + ctx->maps[i].map, ctx->maps[i].map_dma); > >>> > >>> - ctx->map = dma_alloc_coherent(&ctx->dw_dev->pdev->dev, ctx->map_size, > >>> - &ctx->map_dma, GFP_KERNEL); > >>> + ctx->maps[i].map = dma_alloc_coherent(&ctx->dw_dev->pdev->dev, ctx->map_size, > >>> + &ctx->maps[i].map_dma, GFP_KERNEL); > >>> > >>> - if (!ctx->map) > >>> - return -ENOMEM; > >>> + if (!ctx->maps[i].map) > >>> + return -ENOMEM; > >>> + } > >>> > >>> user_map = dw100_get_user_map(ctx); > >>> - memcpy(ctx->map, user_map, ctx->map_size); > >>> + > >>> + mutex_lock(&ctx->maps_mutex); > >>> + ctx->applied_map_id = 0; > >>> + memcpy(ctx->maps[ctx->applied_map_id].map, user_map, ctx->map_size); > >>> + mutex_unlock(&ctx->maps_mutex); > >>> > >>> dev_dbg(&ctx->dw_dev->pdev->dev, > >>> "%ux%u %s mapping created (d:%pad-c:%p) for stream %ux%u->%ux%u\n", > >>> ctx->map_width, ctx->map_height, > >>> ctx->user_map_is_set ? "user" : "identity", > >>> - &ctx->map_dma, ctx->map, > >>> + &ctx->maps[ctx->applied_map_id].map_dma, > >>> + ctx->maps[ctx->applied_map_id].map, > >>> ctx->q_data[DW100_QUEUE_SRC].pix_fmt.width, > >>> ctx->q_data[DW100_QUEUE_DST].pix_fmt.height, > >>> ctx->q_data[DW100_QUEUE_SRC].pix_fmt.width, > >>> @@ -336,10 +350,12 @@ static int dw100_create_mapping(struct dw100_ctx *ctx) > >>> > >>> static void dw100_destroy_mapping(struct dw100_ctx *ctx) > >>> { > >>> - if (ctx->map) { > >>> - dma_free_coherent(&ctx->dw_dev->pdev->dev, ctx->map_size, > >>> - ctx->map, ctx->map_dma); > >>> - ctx->map = NULL; > >>> + for (unsigned int i = 0; i < 2; i++) { > > > > for (unsigned int i = 0; i < ARRAY_SIZE(ctx->maps); i++) { > > struct dw100_map *map = &ctx->maps[i]; > > > > and use map below. > > > >>> + if (ctx->maps[i].map) > >>> + dma_free_coherent(&ctx->dw_dev->pdev->dev, ctx->map_size, > >>> + ctx->maps[i].map, ctx->maps[i].map_dma); > >>> + > >>> + ctx->maps[i].map = NULL; > >>> } > >>> } > >>> > >>> @@ -350,6 +366,15 @@ static int dw100_s_ctrl(struct v4l2_ctrl *ctrl) > >>> > >>> switch (ctrl->id) { > >>> case V4L2_CID_DW100_DEWARPING_16x16_VERTEX_MAP: > >>> + u32 *user_map = ctrl->p_new.p_u32; > >> > >> A warning to fix here. > >> > >>> + unsigned int id; > >>> + > >>> + mutex_lock(&ctx->maps_mutex); > >>> + id = ctx->applied_map_id ? 0 : 1; > >>> + memcpy(ctx->maps[id].map, user_map, ctx->map_size); > >>> + ctx->user_map_is_updated = true; > >> > >> If you call the control before to start the stream, the dma mapping is > >> not yet done(dw100_create_mapping not yet called). Hence, copying the > >> user map to a NULL pointer. > > > > The maps could be allocated in dw100_open() when creating the context. > > That would likely require moving the initialization of ctx->map_width, > > ctx->map_height and ctx->map_size as well. The handling of the identity > > map would probably need to be rewritten too. > > The ctx->map_width, ctx->map_height and ctx->map_size would be updated > on s_fmt(). I saw that ctx->map_width, ctx->map_height and ctx->map_size are set in dw100_ctrl_dewarping_map_init(), with mw = ctrl->dims[0]; mh = ctrl->dims[1]; [...] ctx->map_width = mw; ctx->map_height = mh; ctx->map_size = mh * mw * sizeof(u32); but overlooked the fact that the dimensions are set in dw100_s_fmt(). > I think we can solve the NULL pointer issue by allocating when creating > the context (open()), however, it would require updating (re-allocation) > again before the map can be memcpy()ed before streaming. Because the map > dimensions would have changed. If the map dimensions change, that invalidates the map contents set by userspace. This is currently handled by dw100_ctrl_dewarping_map_init(). You won't be able to just memcpy() the previous control to the new one. > See dw100_s_fmt() > > ... > dims[0] = dw100_get_n_vertices_from_length(q_data->pix_fmt.width); > dims[1] = dw100_get_n_vertices_from_length(q_data->pix_fmt.height); > > ret = v4l2_ctrl_modify_dimensions(ctrl, dims); > ``` > > I checked the v4l2_ctrl_modify_dimensions definition to check if it > issues a call v4l2_ctrl_type_ops.init (where the map dimensions are > updated for dw100) and it does. > > So, I think I will have to introduce allocations in dw100_open() so that > NULL pointer issue doesn't occur and let the dma allocation get > re-allocated with new dimensions just before stream start. That seems a bit pointless, if the map will be invalidated by a call to VIDIOC_S_FMT anyway. The only case where it would be useful is if userspace sets the control before starting streaming and doesn't call VIDIOC_S_FMT. I'm increasingly thinking the driver should use the request API to synchronize the control with the jobs. > Also, we do not have to move the ctx->map_width, ctx->height abd > ctx->map_size inititlisation, since they are already gets initialised to > defaults, on the open() path when v4l2_ctrl_new_custom() is done. > > >>> + mutex_unlock(&ctx->maps_mutex); > >>> + > >>> ctx->user_map_is_set = true; > >>> break; > >>> } > >>> @@ -655,6 +680,8 @@ static int dw100_open(struct file *file) > >>> > >>> v4l2_fh_add(&ctx->fh); > >>> > >>> + mutex_init(&ctx->maps_mutex); > >>> + > >>> return 0; > >>> > >>> err: > >>> @@ -675,6 +702,7 @@ static int dw100_release(struct file *file) > >>> v4l2_ctrl_handler_free(&ctx->hdl); > >>> v4l2_m2m_ctx_release(ctx->fh.m2m_ctx); > >>> mutex_destroy(&ctx->vq_mutex); > >>> + mutex_destroy(&ctx->maps_mutex); > >>> kfree(ctx); > >>> > >>> return 0; > >>> @@ -1453,8 +1481,19 @@ static void dw100_start(struct dw100_ctx *ctx, struct vb2_v4l2_buffer *in_vb, > >>> dw100_hw_set_destination(dw_dev, &ctx->q_data[DW100_QUEUE_DST], > >>> ctx->q_data[DW100_QUEUE_SRC].fmt, > >>> &out_vb->vb2_buf); > >>> - dw100_hw_set_mapping(dw_dev, ctx->map_dma, > >>> - ctx->map_width, ctx->map_height); > >>> + > >>> + > >>> + mutex_lock(&ctx->maps_mutex); > >>> + if (ctx->user_map_is_updated) { > >> > >> The hardware register must unconditionally be updated while starting a > >> new context, as a v4l2 m2m supports multi context operations. Otherwise, > >> you may be running with the user mapping used by the previous context. > >> > >> Moreover, the hardware mapping will not be set in case you use the > >> driver as a simple scaler without user mapping, which causes the process > >> to hang as the run does not start and never completes. > >> > >>> + unsigned int id = ctx->applied_map_id ? 0 : 1; > >>> + > >>> + dw100_hw_set_mapping(dw_dev, ctx->maps[id].map_dma, > >>> + ctx->map_width, ctx->map_height); > >>> + ctx->applied_map_id = id; > >>> + ctx->user_map_is_updated = false; > >>> + } > >>> + mutex_unlock(&ctx->maps_mutex); > >>> + > >>> dw100_hw_enable_irq(dw_dev); > >>> dw100_hw_dewarp_start(dw_dev); > >>> > >> > >> It sounds as this patch requires a collaborative application for running > >> well. All my simple tests failed. > >> > >> You can test a simple scaler/pixfmt conversion operation with v4l2 utils: > >> > >> > >> v4l2-ctl \ > >> -d 0 \ > >> --set-fmt-video-out width=640,height=480,pixelformat=NV12,field=none \ > >> --set-fmt-video width=640,height=480,pixelformat=NV21,field=none \ > >> --stream-out-pattern 3 \ > >> --set-selection-output\ > >> target=crop,top=0,left=0,width=640,height=480,flags= \ > >> --stream-count 100 \ > >> --stream-mmap \ > >> --stream-out-mmap
Hi Laurent, On 28/10/24 8:02 pm, Laurent Pinchart wrote: > Hi Umang, > > On Mon, Oct 28, 2024 at 12:57:52PM +0530, Umang Jain wrote: >> On 27/10/24 8:10 pm, Laurent Pinchart wrote: >>> On Sat, Oct 26, 2024 at 09:52:43PM +0200, Xavier Roumegue wrote: >>>> On 10/22/24 8:31 AM, Umang Jain wrote: >>>>> Currently, vertex maps cannot be updated dynamically while dw100 >>>>> is streaming. This patch enables the support to update the vertex >>>>> map dynamically at runtime. >>>>> >>>>> To support this functionality, we need to allocate and track two >>>>> sets of DMA-allocated vertex maps, one for the currently applied map >>>>> and another for the updated (pending) map. Before the start of next >>>>> frame, if a new user-supplied vertex map is available, the hardware >>>>> mapping is changed to use new vertex map, thus enabling the user to >>>>> update the vertex map at runtime. >>> How do you synchronize the new map with the jobs ? That doesn't seem to >>> be supported by the patch, is it a feature that you don't need ? >> First question around running jobs - isn't the DW100 dewarper run with 1 >> src buffer and 1 dst buffer per context ? Do we need addiitonal >> synchronisation there? I think same point was mentioned by you for >> scaler crop setting but maybe I am missing something to see here. >> >> From the description of .job_ready(): >> >> * @job_ready: optional. Should return 0 if the driver does not have a job >> * fully prepared to run yet (i.e. it will not be able to finish a >> * transaction without sleeping). If not provided, it will be >> * assumed that one source and one destination buffer are all >> * that is required for the driver to perform one full transaction. >> * This method may not sleep. >> >> And when the IRQ handler completes, it calls to v4l2_m2m_job_finish >> which then schedules the next job through v4l2_m2m_schedule_next_job() >> >> So I assumed that, .device_run() and ... in the IRQ handler (call >> to v4l2_m2m_job_finish) will be counted as one job transaction - since >> we are not working with multiple source and destination buffers for one >> transaction. > Correct, but userspace can queue multiple jobs by queuing multiple > output and capture buffers, one of each per job. It doesn't have to wait > for the completion of a job before starting the next one. Indeed, it seems to be possible - nothing is preventing the driver to accept multiple jobs > >> When the next job is started (i.e. dw100_start()) the vertex map index >> which is updated, is programmed to the register. That's is why this >> patch introduced two vertex maps for tracking - one which is applied and >> other one which can be updated by user. > When multiple jobs are queued, setting the control will become > asynchronous relative to the jobs, you won't know to which job the new > map applies. This is due to the asynchronous nature of V4L2 controls. > The way to synchronize controls with jobs would be to use the request > API, which adds complexity. Another option is to avoid queuing multiple > jobs, which is a bit of a workaround that results in reduce throughput. > > What I wonder, and would like to have your feedback on, is whether > synchronous operation is needed in some of the DW100 use cases (and in > particular in your use cases). We are probably operating from the view point that controls are applied for the next job that the the DW100 processes. But indeed, that's not the case due to the async V4L2 controls, as you said. From per-frame metadata reporting purposes - I think we will need to have synchronizing mechanism that the driver undertakes, to actually match that view point. > >>>>> We should ensure no race occurs when the vertex map is updated multiple >>>>> times when a frame is processing. Hence, vertex map is never updated to >>>>> the applied vertex map index in .s_ctrl(). It is always updated on the >>>>> pending vertex map slot, with `maps_mutex` lock held. `maps_mutex` lock >>>>> is also held when the pending vertex map is applied to the hardware in >>>>> dw100_start(). >>>>> >>>>> Ability to update the vertex map at runtime, enables abritrary rotation >>> s/abritrary/arbitrary/ >>> >>>>> and digital zoom features for the input frames, through the dw100 >>>>> hardware. >>>>> >>>>> Signed-off-by: Umang Jain <umang.jain@ideasonboard.com> >>>>> --- >>>>> drivers/media/platform/nxp/dw100/dw100.c | 73 ++++++++++++++++++------ >>>>> 1 file changed, 56 insertions(+), 17 deletions(-) >>>>> >>>>> diff --git a/drivers/media/platform/nxp/dw100/dw100.c b/drivers/media/platform/nxp/dw100/dw100.c >>>>> index 54ebf59df682..42712ccff754 100644 >>>>> --- a/drivers/media/platform/nxp/dw100/dw100.c >>>>> +++ b/drivers/media/platform/nxp/dw100/dw100.c >>>>> @@ -83,6 +83,11 @@ struct dw100_q_data { >>>>> struct v4l2_rect crop; >>>>> }; >>>>> >>>>> +struct dw100_map { >>>>> + unsigned int *map; >>>>> + dma_addr_t map_dma; >>> I would have called the field just 'dma' as it's already qualified by >>> the structure name or the field name in dw100_ctx. >>> >>>>> +}; >>>>> + >>>>> struct dw100_ctx { >>>>> struct v4l2_fh fh; >>>>> struct dw100_device *dw_dev; >>>>> @@ -92,12 +97,14 @@ struct dw100_ctx { >>>>> struct mutex vq_mutex; >>>>> >>>>> /* Look Up Table for pixel remapping */ >>>>> - unsigned int *map; >>>>> - dma_addr_t map_dma; >>>>> + struct dw100_map maps[2]; >>>>> + unsigned int applied_map_id; >>>>> size_t map_size; >>>>> unsigned int map_width; >>>>> unsigned int map_height; >>>>> bool user_map_is_set; >>>>> + bool user_map_is_updated; >>>>> + struct mutex maps_mutex; >>>>> >>>>> /* Source and destination queue data */ >>>>> struct dw100_q_data q_data[2]; >>>>> @@ -308,24 +315,31 @@ static int dw100_create_mapping(struct dw100_ctx *ctx) >>>>> { >>>>> u32 *user_map; >>>>> >>>>> - if (ctx->map) >>>>> - dma_free_coherent(&ctx->dw_dev->pdev->dev, ctx->map_size, >>>>> - ctx->map, ctx->map_dma); >>>>> + for (unsigned int i = 0; i < 2; i++) { >>> for (unsigned int i = 0; i < ARRAY_SIZE(ctx->maps); i++) { >>> struct dw100_map *map = &ctx->maps[i]; >>> >>> and use map below. >>> >>> >>>>> + if (ctx->maps[i].map) >>>>> + dma_free_coherent(&ctx->dw_dev->pdev->dev, ctx->map_size, >>>>> + ctx->maps[i].map, ctx->maps[i].map_dma); >>>>> >>>>> - ctx->map = dma_alloc_coherent(&ctx->dw_dev->pdev->dev, ctx->map_size, >>>>> - &ctx->map_dma, GFP_KERNEL); >>>>> + ctx->maps[i].map = dma_alloc_coherent(&ctx->dw_dev->pdev->dev, ctx->map_size, >>>>> + &ctx->maps[i].map_dma, GFP_KERNEL); >>>>> >>>>> - if (!ctx->map) >>>>> - return -ENOMEM; >>>>> + if (!ctx->maps[i].map) >>>>> + return -ENOMEM; >>>>> + } >>>>> >>>>> user_map = dw100_get_user_map(ctx); >>>>> - memcpy(ctx->map, user_map, ctx->map_size); >>>>> + >>>>> + mutex_lock(&ctx->maps_mutex); >>>>> + ctx->applied_map_id = 0; >>>>> + memcpy(ctx->maps[ctx->applied_map_id].map, user_map, ctx->map_size); >>>>> + mutex_unlock(&ctx->maps_mutex); >>>>> >>>>> dev_dbg(&ctx->dw_dev->pdev->dev, >>>>> "%ux%u %s mapping created (d:%pad-c:%p) for stream %ux%u->%ux%u\n", >>>>> ctx->map_width, ctx->map_height, >>>>> ctx->user_map_is_set ? "user" : "identity", >>>>> - &ctx->map_dma, ctx->map, >>>>> + &ctx->maps[ctx->applied_map_id].map_dma, >>>>> + ctx->maps[ctx->applied_map_id].map, >>>>> ctx->q_data[DW100_QUEUE_SRC].pix_fmt.width, >>>>> ctx->q_data[DW100_QUEUE_DST].pix_fmt.height, >>>>> ctx->q_data[DW100_QUEUE_SRC].pix_fmt.width, >>>>> @@ -336,10 +350,12 @@ static int dw100_create_mapping(struct dw100_ctx *ctx) >>>>> >>>>> static void dw100_destroy_mapping(struct dw100_ctx *ctx) >>>>> { >>>>> - if (ctx->map) { >>>>> - dma_free_coherent(&ctx->dw_dev->pdev->dev, ctx->map_size, >>>>> - ctx->map, ctx->map_dma); >>>>> - ctx->map = NULL; >>>>> + for (unsigned int i = 0; i < 2; i++) { >>> for (unsigned int i = 0; i < ARRAY_SIZE(ctx->maps); i++) { >>> struct dw100_map *map = &ctx->maps[i]; >>> >>> and use map below. >>> >>>>> + if (ctx->maps[i].map) >>>>> + dma_free_coherent(&ctx->dw_dev->pdev->dev, ctx->map_size, >>>>> + ctx->maps[i].map, ctx->maps[i].map_dma); >>>>> + >>>>> + ctx->maps[i].map = NULL; >>>>> } >>>>> } >>>>> >>>>> @@ -350,6 +366,15 @@ static int dw100_s_ctrl(struct v4l2_ctrl *ctrl) >>>>> >>>>> switch (ctrl->id) { >>>>> case V4L2_CID_DW100_DEWARPING_16x16_VERTEX_MAP: >>>>> + u32 *user_map = ctrl->p_new.p_u32; >>>> A warning to fix here. >>>> >>>>> + unsigned int id; >>>>> + >>>>> + mutex_lock(&ctx->maps_mutex); >>>>> + id = ctx->applied_map_id ? 0 : 1; >>>>> + memcpy(ctx->maps[id].map, user_map, ctx->map_size); >>>>> + ctx->user_map_is_updated = true; >>>> If you call the control before to start the stream, the dma mapping is >>>> not yet done(dw100_create_mapping not yet called). Hence, copying the >>>> user map to a NULL pointer. >>> The maps could be allocated in dw100_open() when creating the context. >>> That would likely require moving the initialization of ctx->map_width, >>> ctx->map_height and ctx->map_size as well. The handling of the identity >>> map would probably need to be rewritten too. >>> >>>>> + mutex_unlock(&ctx->maps_mutex); >>>>> + >>>>> ctx->user_map_is_set = true; >>>>> break; >>>>> } >>>>> @@ -655,6 +680,8 @@ static int dw100_open(struct file *file) >>>>> >>>>> v4l2_fh_add(&ctx->fh); >>>>> >>>>> + mutex_init(&ctx->maps_mutex); >>>>> + >>>>> return 0; >>>>> >>>>> err: >>>>> @@ -675,6 +702,7 @@ static int dw100_release(struct file *file) >>>>> v4l2_ctrl_handler_free(&ctx->hdl); >>>>> v4l2_m2m_ctx_release(ctx->fh.m2m_ctx); >>>>> mutex_destroy(&ctx->vq_mutex); >>>>> + mutex_destroy(&ctx->maps_mutex); >>>>> kfree(ctx); >>>>> >>>>> return 0; >>>>> @@ -1453,8 +1481,19 @@ static void dw100_start(struct dw100_ctx *ctx, struct vb2_v4l2_buffer *in_vb, >>>>> dw100_hw_set_destination(dw_dev, &ctx->q_data[DW100_QUEUE_DST], >>>>> ctx->q_data[DW100_QUEUE_SRC].fmt, >>>>> &out_vb->vb2_buf); >>>>> - dw100_hw_set_mapping(dw_dev, ctx->map_dma, >>>>> - ctx->map_width, ctx->map_height); >>>>> + >>>>> + >>>>> + mutex_lock(&ctx->maps_mutex); >>>>> + if (ctx->user_map_is_updated) { >>>> The hardware register must unconditionally be updated while starting a >>>> new context, as a v4l2 m2m supports multi context operations. Otherwise, >>>> you may be running with the user mapping used by the previous context. >>>> >>>> Moreover, the hardware mapping will not be set in case you use the >>>> driver as a simple scaler without user mapping, which causes the process >>>> to hang as the run does not start and never completes. >>>> >>>>> + unsigned int id = ctx->applied_map_id ? 0 : 1; >>>>> + >>>>> + dw100_hw_set_mapping(dw_dev, ctx->maps[id].map_dma, >>>>> + ctx->map_width, ctx->map_height); >>>>> + ctx->applied_map_id = id; >>>>> + ctx->user_map_is_updated = false; >>>>> + } >>>>> + mutex_unlock(&ctx->maps_mutex); >>>>> + >>>>> dw100_hw_enable_irq(dw_dev); >>>>> dw100_hw_dewarp_start(dw_dev); >>>>> >>>> It sounds as this patch requires a collaborative application for running >>>> well. All my simple tests failed. >>>> >>>> You can test a simple scaler/pixfmt conversion operation with v4l2 utils: >>>> >>>> >>>> v4l2-ctl \ >>>> -d 0 \ >>>> --set-fmt-video-out width=640,height=480,pixelformat=NV12,field=none \ >>>> --set-fmt-video width=640,height=480,pixelformat=NV21,field=none \ >>>> --stream-out-pattern 3 \ >>>> --set-selection-output\ >>>> target=crop,top=0,left=0,width=640,height=480,flags= \ >>>> --stream-count 100 \ >>>> --stream-mmap \ >>>> --stream-out-mmap
Hi Laurent, On 28/10/24 8:11 pm, Laurent Pinchart wrote: > Hi Umang, > > On Mon, Oct 28, 2024 at 07:47:46PM +0530, Umang Jain wrote: >> On 27/10/24 8:10 pm, Laurent Pinchart wrote: >>> On Sat, Oct 26, 2024 at 09:52:43PM +0200, Xavier Roumegue wrote: >>>> On 10/22/24 8:31 AM, Umang Jain wrote: >>>>> Currently, vertex maps cannot be updated dynamically while dw100 >>>>> is streaming. This patch enables the support to update the vertex >>>>> map dynamically at runtime. >>>>> >>>>> To support this functionality, we need to allocate and track two >>>>> sets of DMA-allocated vertex maps, one for the currently applied map >>>>> and another for the updated (pending) map. Before the start of next >>>>> frame, if a new user-supplied vertex map is available, the hardware >>>>> mapping is changed to use new vertex map, thus enabling the user to >>>>> update the vertex map at runtime. >>> How do you synchronize the new map with the jobs ? That doesn't seem to >>> be supported by the patch, is it a feature that you don't need ? >>> >>>>> We should ensure no race occurs when the vertex map is updated multiple >>>>> times when a frame is processing. Hence, vertex map is never updated to >>>>> the applied vertex map index in .s_ctrl(). It is always updated on the >>>>> pending vertex map slot, with `maps_mutex` lock held. `maps_mutex` lock >>>>> is also held when the pending vertex map is applied to the hardware in >>>>> dw100_start(). >>>>> >>>>> Ability to update the vertex map at runtime, enables abritrary rotation >>> s/abritrary/arbitrary/ >>> >>>>> and digital zoom features for the input frames, through the dw100 >>>>> hardware. >>>>> >>>>> Signed-off-by: Umang Jain <umang.jain@ideasonboard.com> >>>>> --- >>>>> drivers/media/platform/nxp/dw100/dw100.c | 73 ++++++++++++++++++------ >>>>> 1 file changed, 56 insertions(+), 17 deletions(-) >>>>> >>>>> diff --git a/drivers/media/platform/nxp/dw100/dw100.c b/drivers/media/platform/nxp/dw100/dw100.c >>>>> index 54ebf59df682..42712ccff754 100644 >>>>> --- a/drivers/media/platform/nxp/dw100/dw100.c >>>>> +++ b/drivers/media/platform/nxp/dw100/dw100.c >>>>> @@ -83,6 +83,11 @@ struct dw100_q_data { >>>>> struct v4l2_rect crop; >>>>> }; >>>>> >>>>> +struct dw100_map { >>>>> + unsigned int *map; >>>>> + dma_addr_t map_dma; >>> I would have called the field just 'dma' as it's already qualified by >>> the structure name or the field name in dw100_ctx. >>> >>>>> +}; >>>>> + >>>>> struct dw100_ctx { >>>>> struct v4l2_fh fh; >>>>> struct dw100_device *dw_dev; >>>>> @@ -92,12 +97,14 @@ struct dw100_ctx { >>>>> struct mutex vq_mutex; >>>>> >>>>> /* Look Up Table for pixel remapping */ >>>>> - unsigned int *map; >>>>> - dma_addr_t map_dma; >>>>> + struct dw100_map maps[2]; >>>>> + unsigned int applied_map_id; >>>>> size_t map_size; >>>>> unsigned int map_width; >>>>> unsigned int map_height; >>>>> bool user_map_is_set; >>>>> + bool user_map_is_updated; >>>>> + struct mutex maps_mutex; >>>>> >>>>> /* Source and destination queue data */ >>>>> struct dw100_q_data q_data[2]; >>>>> @@ -308,24 +315,31 @@ static int dw100_create_mapping(struct dw100_ctx *ctx) >>>>> { >>>>> u32 *user_map; >>>>> >>>>> - if (ctx->map) >>>>> - dma_free_coherent(&ctx->dw_dev->pdev->dev, ctx->map_size, >>>>> - ctx->map, ctx->map_dma); >>>>> + for (unsigned int i = 0; i < 2; i++) { >>> for (unsigned int i = 0; i < ARRAY_SIZE(ctx->maps); i++) { >>> struct dw100_map *map = &ctx->maps[i]; >>> >>> and use map below. >>> >>> >>>>> + if (ctx->maps[i].map) >>>>> + dma_free_coherent(&ctx->dw_dev->pdev->dev, ctx->map_size, >>>>> + ctx->maps[i].map, ctx->maps[i].map_dma); >>>>> >>>>> - ctx->map = dma_alloc_coherent(&ctx->dw_dev->pdev->dev, ctx->map_size, >>>>> - &ctx->map_dma, GFP_KERNEL); >>>>> + ctx->maps[i].map = dma_alloc_coherent(&ctx->dw_dev->pdev->dev, ctx->map_size, >>>>> + &ctx->maps[i].map_dma, GFP_KERNEL); >>>>> >>>>> - if (!ctx->map) >>>>> - return -ENOMEM; >>>>> + if (!ctx->maps[i].map) >>>>> + return -ENOMEM; >>>>> + } >>>>> >>>>> user_map = dw100_get_user_map(ctx); >>>>> - memcpy(ctx->map, user_map, ctx->map_size); >>>>> + >>>>> + mutex_lock(&ctx->maps_mutex); >>>>> + ctx->applied_map_id = 0; >>>>> + memcpy(ctx->maps[ctx->applied_map_id].map, user_map, ctx->map_size); >>>>> + mutex_unlock(&ctx->maps_mutex); >>>>> >>>>> dev_dbg(&ctx->dw_dev->pdev->dev, >>>>> "%ux%u %s mapping created (d:%pad-c:%p) for stream %ux%u->%ux%u\n", >>>>> ctx->map_width, ctx->map_height, >>>>> ctx->user_map_is_set ? "user" : "identity", >>>>> - &ctx->map_dma, ctx->map, >>>>> + &ctx->maps[ctx->applied_map_id].map_dma, >>>>> + ctx->maps[ctx->applied_map_id].map, >>>>> ctx->q_data[DW100_QUEUE_SRC].pix_fmt.width, >>>>> ctx->q_data[DW100_QUEUE_DST].pix_fmt.height, >>>>> ctx->q_data[DW100_QUEUE_SRC].pix_fmt.width, >>>>> @@ -336,10 +350,12 @@ static int dw100_create_mapping(struct dw100_ctx *ctx) >>>>> >>>>> static void dw100_destroy_mapping(struct dw100_ctx *ctx) >>>>> { >>>>> - if (ctx->map) { >>>>> - dma_free_coherent(&ctx->dw_dev->pdev->dev, ctx->map_size, >>>>> - ctx->map, ctx->map_dma); >>>>> - ctx->map = NULL; >>>>> + for (unsigned int i = 0; i < 2; i++) { >>> for (unsigned int i = 0; i < ARRAY_SIZE(ctx->maps); i++) { >>> struct dw100_map *map = &ctx->maps[i]; >>> >>> and use map below. >>> >>>>> + if (ctx->maps[i].map) >>>>> + dma_free_coherent(&ctx->dw_dev->pdev->dev, ctx->map_size, >>>>> + ctx->maps[i].map, ctx->maps[i].map_dma); >>>>> + >>>>> + ctx->maps[i].map = NULL; >>>>> } >>>>> } >>>>> >>>>> @@ -350,6 +366,15 @@ static int dw100_s_ctrl(struct v4l2_ctrl *ctrl) >>>>> >>>>> switch (ctrl->id) { >>>>> case V4L2_CID_DW100_DEWARPING_16x16_VERTEX_MAP: >>>>> + u32 *user_map = ctrl->p_new.p_u32; >>>> A warning to fix here. >>>> >>>>> + unsigned int id; >>>>> + >>>>> + mutex_lock(&ctx->maps_mutex); >>>>> + id = ctx->applied_map_id ? 0 : 1; >>>>> + memcpy(ctx->maps[id].map, user_map, ctx->map_size); >>>>> + ctx->user_map_is_updated = true; >>>> If you call the control before to start the stream, the dma mapping is >>>> not yet done(dw100_create_mapping not yet called). Hence, copying the >>>> user map to a NULL pointer. >>> The maps could be allocated in dw100_open() when creating the context. >>> That would likely require moving the initialization of ctx->map_width, >>> ctx->map_height and ctx->map_size as well. The handling of the identity >>> map would probably need to be rewritten too. >> The ctx->map_width, ctx->map_height and ctx->map_size would be updated >> on s_fmt(). > I saw that ctx->map_width, ctx->map_height and ctx->map_size are set in > dw100_ctrl_dewarping_map_init(), with > > mw = ctrl->dims[0]; > mh = ctrl->dims[1]; > > [...] > > ctx->map_width = mw; > ctx->map_height = mh; > ctx->map_size = mh * mw * sizeof(u32); > > but overlooked the fact that the dimensions are set in dw100_s_fmt(). > >> I think we can solve the NULL pointer issue by allocating when creating >> the context (open()), however, it would require updating (re-allocation) >> again before the map can be memcpy()ed before streaming. Because the map >> dimensions would have changed. > If the map dimensions change, that invalidates the map contents set by > userspace. This is currently handled by dw100_ctrl_dewarping_map_init(). > You won't be able to just memcpy() the previous control to the new one. > >> See dw100_s_fmt() >> >> ... >> dims[0] = dw100_get_n_vertices_from_length(q_data->pix_fmt.width); >> dims[1] = dw100_get_n_vertices_from_length(q_data->pix_fmt.height); >> >> ret = v4l2_ctrl_modify_dimensions(ctrl, dims); >> ``` >> >> I checked the v4l2_ctrl_modify_dimensions definition to check if it >> issues a call v4l2_ctrl_type_ops.init (where the map dimensions are >> updated for dw100) and it does. >> >> So, I think I will have to introduce allocations in dw100_open() so that >> NULL pointer issue doesn't occur and let the dma allocation get >> re-allocated with new dimensions just before stream start. > That seems a bit pointless, if the map will be invalidated by a call to > VIDIOC_S_FMT anyway. The only case where it would be useful is if > userspace sets the control before starting streaming and doesn't call > VIDIOC_S_FMT. I was indeed not comfortable with the .open() dma-allocation approach and hence, I summarised it here for discussion. > > I'm increasingly thinking the driver should use the request API to > synchronize the control with the jobs. I will atleast consider and estimate how much complex it would be! > >> Also, we do not have to move the ctx->map_width, ctx->height abd >> ctx->map_size inititlisation, since they are already gets initialised to >> defaults, on the open() path when v4l2_ctrl_new_custom() is done. >> >>>>> + mutex_unlock(&ctx->maps_mutex); >>>>> + >>>>> ctx->user_map_is_set = true; >>>>> break; >>>>> } >>>>> @@ -655,6 +680,8 @@ static int dw100_open(struct file *file) >>>>> >>>>> v4l2_fh_add(&ctx->fh); >>>>> >>>>> + mutex_init(&ctx->maps_mutex); >>>>> + >>>>> return 0; >>>>> >>>>> err: >>>>> @@ -675,6 +702,7 @@ static int dw100_release(struct file *file) >>>>> v4l2_ctrl_handler_free(&ctx->hdl); >>>>> v4l2_m2m_ctx_release(ctx->fh.m2m_ctx); >>>>> mutex_destroy(&ctx->vq_mutex); >>>>> + mutex_destroy(&ctx->maps_mutex); >>>>> kfree(ctx); >>>>> >>>>> return 0; >>>>> @@ -1453,8 +1481,19 @@ static void dw100_start(struct dw100_ctx *ctx, struct vb2_v4l2_buffer *in_vb, >>>>> dw100_hw_set_destination(dw_dev, &ctx->q_data[DW100_QUEUE_DST], >>>>> ctx->q_data[DW100_QUEUE_SRC].fmt, >>>>> &out_vb->vb2_buf); >>>>> - dw100_hw_set_mapping(dw_dev, ctx->map_dma, >>>>> - ctx->map_width, ctx->map_height); >>>>> + >>>>> + >>>>> + mutex_lock(&ctx->maps_mutex); >>>>> + if (ctx->user_map_is_updated) { >>>> The hardware register must unconditionally be updated while starting a >>>> new context, as a v4l2 m2m supports multi context operations. Otherwise, >>>> you may be running with the user mapping used by the previous context. >>>> >>>> Moreover, the hardware mapping will not be set in case you use the >>>> driver as a simple scaler without user mapping, which causes the process >>>> to hang as the run does not start and never completes. >>>> >>>>> + unsigned int id = ctx->applied_map_id ? 0 : 1; >>>>> + >>>>> + dw100_hw_set_mapping(dw_dev, ctx->maps[id].map_dma, >>>>> + ctx->map_width, ctx->map_height); >>>>> + ctx->applied_map_id = id; >>>>> + ctx->user_map_is_updated = false; >>>>> + } >>>>> + mutex_unlock(&ctx->maps_mutex); >>>>> + >>>>> dw100_hw_enable_irq(dw_dev); >>>>> dw100_hw_dewarp_start(dw_dev); >>>>> >>>> It sounds as this patch requires a collaborative application for running >>>> well. All my simple tests failed. >>>> >>>> You can test a simple scaler/pixfmt conversion operation with v4l2 utils: >>>> >>>> >>>> v4l2-ctl \ >>>> -d 0 \ >>>> --set-fmt-video-out width=640,height=480,pixelformat=NV12,field=none \ >>>> --set-fmt-video width=640,height=480,pixelformat=NV21,field=none \ >>>> --stream-out-pattern 3 \ >>>> --set-selection-output\ >>>> target=crop,top=0,left=0,width=640,height=480,flags= \ >>>> --stream-count 100 \ >>>> --stream-mmap \ >>>> --stream-out-mmap
On Mon, Oct 28, 2024 at 08:32:51PM +0530, Umang Jain wrote: > Hi Laurent, > > On 28/10/24 8:11 pm, Laurent Pinchart wrote: > > Hi Umang, > > > > On Mon, Oct 28, 2024 at 07:47:46PM +0530, Umang Jain wrote: > >> On 27/10/24 8:10 pm, Laurent Pinchart wrote: > >>> On Sat, Oct 26, 2024 at 09:52:43PM +0200, Xavier Roumegue wrote: > >>>> On 10/22/24 8:31 AM, Umang Jain wrote: > >>>>> Currently, vertex maps cannot be updated dynamically while dw100 > >>>>> is streaming. This patch enables the support to update the vertex > >>>>> map dynamically at runtime. > >>>>> > >>>>> To support this functionality, we need to allocate and track two > >>>>> sets of DMA-allocated vertex maps, one for the currently applied map > >>>>> and another for the updated (pending) map. Before the start of next > >>>>> frame, if a new user-supplied vertex map is available, the hardware > >>>>> mapping is changed to use new vertex map, thus enabling the user to > >>>>> update the vertex map at runtime. > >>> How do you synchronize the new map with the jobs ? That doesn't seem to > >>> be supported by the patch, is it a feature that you don't need ? > >>> > >>>>> We should ensure no race occurs when the vertex map is updated multiple > >>>>> times when a frame is processing. Hence, vertex map is never updated to > >>>>> the applied vertex map index in .s_ctrl(). It is always updated on the > >>>>> pending vertex map slot, with `maps_mutex` lock held. `maps_mutex` lock > >>>>> is also held when the pending vertex map is applied to the hardware in > >>>>> dw100_start(). > >>>>> > >>>>> Ability to update the vertex map at runtime, enables abritrary rotation > >>> s/abritrary/arbitrary/ > >>> > >>>>> and digital zoom features for the input frames, through the dw100 > >>>>> hardware. > >>>>> > >>>>> Signed-off-by: Umang Jain <umang.jain@ideasonboard.com> > >>>>> --- > >>>>> drivers/media/platform/nxp/dw100/dw100.c | 73 ++++++++++++++++++------ > >>>>> 1 file changed, 56 insertions(+), 17 deletions(-) > >>>>> > >>>>> diff --git a/drivers/media/platform/nxp/dw100/dw100.c b/drivers/media/platform/nxp/dw100/dw100.c > >>>>> index 54ebf59df682..42712ccff754 100644 > >>>>> --- a/drivers/media/platform/nxp/dw100/dw100.c > >>>>> +++ b/drivers/media/platform/nxp/dw100/dw100.c > >>>>> @@ -83,6 +83,11 @@ struct dw100_q_data { > >>>>> struct v4l2_rect crop; > >>>>> }; > >>>>> > >>>>> +struct dw100_map { > >>>>> + unsigned int *map; > >>>>> + dma_addr_t map_dma; > >>> I would have called the field just 'dma' as it's already qualified by > >>> the structure name or the field name in dw100_ctx. > >>> > >>>>> +}; > >>>>> + > >>>>> struct dw100_ctx { > >>>>> struct v4l2_fh fh; > >>>>> struct dw100_device *dw_dev; > >>>>> @@ -92,12 +97,14 @@ struct dw100_ctx { > >>>>> struct mutex vq_mutex; > >>>>> > >>>>> /* Look Up Table for pixel remapping */ > >>>>> - unsigned int *map; > >>>>> - dma_addr_t map_dma; > >>>>> + struct dw100_map maps[2]; > >>>>> + unsigned int applied_map_id; > >>>>> size_t map_size; > >>>>> unsigned int map_width; > >>>>> unsigned int map_height; > >>>>> bool user_map_is_set; > >>>>> + bool user_map_is_updated; > >>>>> + struct mutex maps_mutex; > >>>>> > >>>>> /* Source and destination queue data */ > >>>>> struct dw100_q_data q_data[2]; > >>>>> @@ -308,24 +315,31 @@ static int dw100_create_mapping(struct dw100_ctx *ctx) > >>>>> { > >>>>> u32 *user_map; > >>>>> > >>>>> - if (ctx->map) > >>>>> - dma_free_coherent(&ctx->dw_dev->pdev->dev, ctx->map_size, > >>>>> - ctx->map, ctx->map_dma); > >>>>> + for (unsigned int i = 0; i < 2; i++) { > >>> for (unsigned int i = 0; i < ARRAY_SIZE(ctx->maps); i++) { > >>> struct dw100_map *map = &ctx->maps[i]; > >>> > >>> and use map below. > >>> > >>> > >>>>> + if (ctx->maps[i].map) > >>>>> + dma_free_coherent(&ctx->dw_dev->pdev->dev, ctx->map_size, > >>>>> + ctx->maps[i].map, ctx->maps[i].map_dma); > >>>>> > >>>>> - ctx->map = dma_alloc_coherent(&ctx->dw_dev->pdev->dev, ctx->map_size, > >>>>> - &ctx->map_dma, GFP_KERNEL); > >>>>> + ctx->maps[i].map = dma_alloc_coherent(&ctx->dw_dev->pdev->dev, ctx->map_size, > >>>>> + &ctx->maps[i].map_dma, GFP_KERNEL); > >>>>> > >>>>> - if (!ctx->map) > >>>>> - return -ENOMEM; > >>>>> + if (!ctx->maps[i].map) > >>>>> + return -ENOMEM; > >>>>> + } > >>>>> > >>>>> user_map = dw100_get_user_map(ctx); > >>>>> - memcpy(ctx->map, user_map, ctx->map_size); > >>>>> + > >>>>> + mutex_lock(&ctx->maps_mutex); > >>>>> + ctx->applied_map_id = 0; > >>>>> + memcpy(ctx->maps[ctx->applied_map_id].map, user_map, ctx->map_size); > >>>>> + mutex_unlock(&ctx->maps_mutex); > >>>>> > >>>>> dev_dbg(&ctx->dw_dev->pdev->dev, > >>>>> "%ux%u %s mapping created (d:%pad-c:%p) for stream %ux%u->%ux%u\n", > >>>>> ctx->map_width, ctx->map_height, > >>>>> ctx->user_map_is_set ? "user" : "identity", > >>>>> - &ctx->map_dma, ctx->map, > >>>>> + &ctx->maps[ctx->applied_map_id].map_dma, > >>>>> + ctx->maps[ctx->applied_map_id].map, > >>>>> ctx->q_data[DW100_QUEUE_SRC].pix_fmt.width, > >>>>> ctx->q_data[DW100_QUEUE_DST].pix_fmt.height, > >>>>> ctx->q_data[DW100_QUEUE_SRC].pix_fmt.width, > >>>>> @@ -336,10 +350,12 @@ static int dw100_create_mapping(struct dw100_ctx *ctx) > >>>>> > >>>>> static void dw100_destroy_mapping(struct dw100_ctx *ctx) > >>>>> { > >>>>> - if (ctx->map) { > >>>>> - dma_free_coherent(&ctx->dw_dev->pdev->dev, ctx->map_size, > >>>>> - ctx->map, ctx->map_dma); > >>>>> - ctx->map = NULL; > >>>>> + for (unsigned int i = 0; i < 2; i++) { > >>> for (unsigned int i = 0; i < ARRAY_SIZE(ctx->maps); i++) { > >>> struct dw100_map *map = &ctx->maps[i]; > >>> > >>> and use map below. > >>> > >>>>> + if (ctx->maps[i].map) > >>>>> + dma_free_coherent(&ctx->dw_dev->pdev->dev, ctx->map_size, > >>>>> + ctx->maps[i].map, ctx->maps[i].map_dma); > >>>>> + > >>>>> + ctx->maps[i].map = NULL; > >>>>> } > >>>>> } > >>>>> > >>>>> @@ -350,6 +366,15 @@ static int dw100_s_ctrl(struct v4l2_ctrl *ctrl) > >>>>> > >>>>> switch (ctrl->id) { > >>>>> case V4L2_CID_DW100_DEWARPING_16x16_VERTEX_MAP: > >>>>> + u32 *user_map = ctrl->p_new.p_u32; > >>>> A warning to fix here. > >>>> > >>>>> + unsigned int id; > >>>>> + > >>>>> + mutex_lock(&ctx->maps_mutex); > >>>>> + id = ctx->applied_map_id ? 0 : 1; > >>>>> + memcpy(ctx->maps[id].map, user_map, ctx->map_size); > >>>>> + ctx->user_map_is_updated = true; > >>>> If you call the control before to start the stream, the dma mapping is > >>>> not yet done(dw100_create_mapping not yet called). Hence, copying the > >>>> user map to a NULL pointer. > >>> The maps could be allocated in dw100_open() when creating the context. > >>> That would likely require moving the initialization of ctx->map_width, > >>> ctx->map_height and ctx->map_size as well. The handling of the identity > >>> map would probably need to be rewritten too. > >> The ctx->map_width, ctx->map_height and ctx->map_size would be updated > >> on s_fmt(). > > I saw that ctx->map_width, ctx->map_height and ctx->map_size are set in > > dw100_ctrl_dewarping_map_init(), with > > > > mw = ctrl->dims[0]; > > mh = ctrl->dims[1]; > > > > [...] > > > > ctx->map_width = mw; > > ctx->map_height = mh; > > ctx->map_size = mh * mw * sizeof(u32); > > > > but overlooked the fact that the dimensions are set in dw100_s_fmt(). > > > >> I think we can solve the NULL pointer issue by allocating when creating > >> the context (open()), however, it would require updating (re-allocation) > >> again before the map can be memcpy()ed before streaming. Because the map > >> dimensions would have changed. > > If the map dimensions change, that invalidates the map contents set by > > userspace. This is currently handled by dw100_ctrl_dewarping_map_init(). > > You won't be able to just memcpy() the previous control to the new one. > > > >> See dw100_s_fmt() > >> > >> ... > >> dims[0] = dw100_get_n_vertices_from_length(q_data->pix_fmt.width); > >> dims[1] = dw100_get_n_vertices_from_length(q_data->pix_fmt.height); > >> > >> ret = v4l2_ctrl_modify_dimensions(ctrl, dims); > >> ``` > >> > >> I checked the v4l2_ctrl_modify_dimensions definition to check if it > >> issues a call v4l2_ctrl_type_ops.init (where the map dimensions are > >> updated for dw100) and it does. > >> > >> So, I think I will have to introduce allocations in dw100_open() so that > >> NULL pointer issue doesn't occur and let the dma allocation get > >> re-allocated with new dimensions just before stream start. > > > > That seems a bit pointless, if the map will be invalidated by a call to > > VIDIOC_S_FMT anyway. The only case where it would be useful is if > > userspace sets the control before starting streaming and doesn't call > > VIDIOC_S_FMT. > > I was indeed not comfortable with the .open() dma-allocation approach > and hence, I summarised it here for discussion. > > > I'm increasingly thinking the driver should use the request API to > > synchronize the control with the jobs. > > I will atleast consider and estimate how much complex it would be! Good idea, let's make a decision based on the need and complexity. > >> Also, we do not have to move the ctx->map_width, ctx->height abd > >> ctx->map_size inititlisation, since they are already gets initialised to > >> defaults, on the open() path when v4l2_ctrl_new_custom() is done. > >> > >>>>> + mutex_unlock(&ctx->maps_mutex); > >>>>> + > >>>>> ctx->user_map_is_set = true; > >>>>> break; > >>>>> } > >>>>> @@ -655,6 +680,8 @@ static int dw100_open(struct file *file) > >>>>> > >>>>> v4l2_fh_add(&ctx->fh); > >>>>> > >>>>> + mutex_init(&ctx->maps_mutex); > >>>>> + > >>>>> return 0; > >>>>> > >>>>> err: > >>>>> @@ -675,6 +702,7 @@ static int dw100_release(struct file *file) > >>>>> v4l2_ctrl_handler_free(&ctx->hdl); > >>>>> v4l2_m2m_ctx_release(ctx->fh.m2m_ctx); > >>>>> mutex_destroy(&ctx->vq_mutex); > >>>>> + mutex_destroy(&ctx->maps_mutex); > >>>>> kfree(ctx); > >>>>> > >>>>> return 0; > >>>>> @@ -1453,8 +1481,19 @@ static void dw100_start(struct dw100_ctx *ctx, struct vb2_v4l2_buffer *in_vb, > >>>>> dw100_hw_set_destination(dw_dev, &ctx->q_data[DW100_QUEUE_DST], > >>>>> ctx->q_data[DW100_QUEUE_SRC].fmt, > >>>>> &out_vb->vb2_buf); > >>>>> - dw100_hw_set_mapping(dw_dev, ctx->map_dma, > >>>>> - ctx->map_width, ctx->map_height); > >>>>> + > >>>>> + > >>>>> + mutex_lock(&ctx->maps_mutex); > >>>>> + if (ctx->user_map_is_updated) { > >>>> The hardware register must unconditionally be updated while starting a > >>>> new context, as a v4l2 m2m supports multi context operations. Otherwise, > >>>> you may be running with the user mapping used by the previous context. > >>>> > >>>> Moreover, the hardware mapping will not be set in case you use the > >>>> driver as a simple scaler without user mapping, which causes the process > >>>> to hang as the run does not start and never completes. > >>>> > >>>>> + unsigned int id = ctx->applied_map_id ? 0 : 1; > >>>>> + > >>>>> + dw100_hw_set_mapping(dw_dev, ctx->maps[id].map_dma, > >>>>> + ctx->map_width, ctx->map_height); > >>>>> + ctx->applied_map_id = id; > >>>>> + ctx->user_map_is_updated = false; > >>>>> + } > >>>>> + mutex_unlock(&ctx->maps_mutex); > >>>>> + > >>>>> dw100_hw_enable_irq(dw_dev); > >>>>> dw100_hw_dewarp_start(dw_dev); > >>>>> > >>>> It sounds as this patch requires a collaborative application for running > >>>> well. All my simple tests failed. > >>>> > >>>> You can test a simple scaler/pixfmt conversion operation with v4l2 utils: > >>>> > >>>> > >>>> v4l2-ctl \ > >>>> -d 0 \ > >>>> --set-fmt-video-out width=640,height=480,pixelformat=NV12,field=none \ > >>>> --set-fmt-video width=640,height=480,pixelformat=NV21,field=none \ > >>>> --stream-out-pattern 3 \ > >>>> --set-selection-output\ > >>>> target=crop,top=0,left=0,width=640,height=480,flags= \ > >>>> --stream-count 100 \ > >>>> --stream-mmap \ > >>>> --stream-out-mmap
diff --git a/drivers/media/platform/nxp/dw100/dw100.c b/drivers/media/platform/nxp/dw100/dw100.c index 54ebf59df682..42712ccff754 100644 --- a/drivers/media/platform/nxp/dw100/dw100.c +++ b/drivers/media/platform/nxp/dw100/dw100.c @@ -83,6 +83,11 @@ struct dw100_q_data { struct v4l2_rect crop; }; +struct dw100_map { + unsigned int *map; + dma_addr_t map_dma; +}; + struct dw100_ctx { struct v4l2_fh fh; struct dw100_device *dw_dev; @@ -92,12 +97,14 @@ struct dw100_ctx { struct mutex vq_mutex; /* Look Up Table for pixel remapping */ - unsigned int *map; - dma_addr_t map_dma; + struct dw100_map maps[2]; + unsigned int applied_map_id; size_t map_size; unsigned int map_width; unsigned int map_height; bool user_map_is_set; + bool user_map_is_updated; + struct mutex maps_mutex; /* Source and destination queue data */ struct dw100_q_data q_data[2]; @@ -308,24 +315,31 @@ static int dw100_create_mapping(struct dw100_ctx *ctx) { u32 *user_map; - if (ctx->map) - dma_free_coherent(&ctx->dw_dev->pdev->dev, ctx->map_size, - ctx->map, ctx->map_dma); + for (unsigned int i = 0; i < 2; i++) { + if (ctx->maps[i].map) + dma_free_coherent(&ctx->dw_dev->pdev->dev, ctx->map_size, + ctx->maps[i].map, ctx->maps[i].map_dma); - ctx->map = dma_alloc_coherent(&ctx->dw_dev->pdev->dev, ctx->map_size, - &ctx->map_dma, GFP_KERNEL); + ctx->maps[i].map = dma_alloc_coherent(&ctx->dw_dev->pdev->dev, ctx->map_size, + &ctx->maps[i].map_dma, GFP_KERNEL); - if (!ctx->map) - return -ENOMEM; + if (!ctx->maps[i].map) + return -ENOMEM; + } user_map = dw100_get_user_map(ctx); - memcpy(ctx->map, user_map, ctx->map_size); + + mutex_lock(&ctx->maps_mutex); + ctx->applied_map_id = 0; + memcpy(ctx->maps[ctx->applied_map_id].map, user_map, ctx->map_size); + mutex_unlock(&ctx->maps_mutex); dev_dbg(&ctx->dw_dev->pdev->dev, "%ux%u %s mapping created (d:%pad-c:%p) for stream %ux%u->%ux%u\n", ctx->map_width, ctx->map_height, ctx->user_map_is_set ? "user" : "identity", - &ctx->map_dma, ctx->map, + &ctx->maps[ctx->applied_map_id].map_dma, + ctx->maps[ctx->applied_map_id].map, ctx->q_data[DW100_QUEUE_SRC].pix_fmt.width, ctx->q_data[DW100_QUEUE_DST].pix_fmt.height, ctx->q_data[DW100_QUEUE_SRC].pix_fmt.width, @@ -336,10 +350,12 @@ static int dw100_create_mapping(struct dw100_ctx *ctx) static void dw100_destroy_mapping(struct dw100_ctx *ctx) { - if (ctx->map) { - dma_free_coherent(&ctx->dw_dev->pdev->dev, ctx->map_size, - ctx->map, ctx->map_dma); - ctx->map = NULL; + for (unsigned int i = 0; i < 2; i++) { + if (ctx->maps[i].map) + dma_free_coherent(&ctx->dw_dev->pdev->dev, ctx->map_size, + ctx->maps[i].map, ctx->maps[i].map_dma); + + ctx->maps[i].map = NULL; } } @@ -350,6 +366,15 @@ static int dw100_s_ctrl(struct v4l2_ctrl *ctrl) switch (ctrl->id) { case V4L2_CID_DW100_DEWARPING_16x16_VERTEX_MAP: + u32 *user_map = ctrl->p_new.p_u32; + unsigned int id; + + mutex_lock(&ctx->maps_mutex); + id = ctx->applied_map_id ? 0 : 1; + memcpy(ctx->maps[id].map, user_map, ctx->map_size); + ctx->user_map_is_updated = true; + mutex_unlock(&ctx->maps_mutex); + ctx->user_map_is_set = true; break; } @@ -655,6 +680,8 @@ static int dw100_open(struct file *file) v4l2_fh_add(&ctx->fh); + mutex_init(&ctx->maps_mutex); + return 0; err: @@ -675,6 +702,7 @@ static int dw100_release(struct file *file) v4l2_ctrl_handler_free(&ctx->hdl); v4l2_m2m_ctx_release(ctx->fh.m2m_ctx); mutex_destroy(&ctx->vq_mutex); + mutex_destroy(&ctx->maps_mutex); kfree(ctx); return 0; @@ -1453,8 +1481,19 @@ static void dw100_start(struct dw100_ctx *ctx, struct vb2_v4l2_buffer *in_vb, dw100_hw_set_destination(dw_dev, &ctx->q_data[DW100_QUEUE_DST], ctx->q_data[DW100_QUEUE_SRC].fmt, &out_vb->vb2_buf); - dw100_hw_set_mapping(dw_dev, ctx->map_dma, - ctx->map_width, ctx->map_height); + + + mutex_lock(&ctx->maps_mutex); + if (ctx->user_map_is_updated) { + unsigned int id = ctx->applied_map_id ? 0 : 1; + + dw100_hw_set_mapping(dw_dev, ctx->maps[id].map_dma, + ctx->map_width, ctx->map_height); + ctx->applied_map_id = id; + ctx->user_map_is_updated = false; + } + mutex_unlock(&ctx->maps_mutex); + dw100_hw_enable_irq(dw_dev); dw100_hw_dewarp_start(dw_dev);
Currently, vertex maps cannot be updated dynamically while dw100 is streaming. This patch enables the support to update the vertex map dynamically at runtime. To support this functionality, we need to allocate and track two sets of DMA-allocated vertex maps, one for the currently applied map and another for the updated (pending) map. Before the start of next frame, if a new user-supplied vertex map is available, the hardware mapping is changed to use new vertex map, thus enabling the user to update the vertex map at runtime. We should ensure no race occurs when the vertex map is updated multiple times when a frame is processing. Hence, vertex map is never updated to the applied vertex map index in .s_ctrl(). It is always updated on the pending vertex map slot, with `maps_mutex` lock held. `maps_mutex` lock is also held when the pending vertex map is applied to the hardware in dw100_start(). Ability to update the vertex map at runtime, enables abritrary rotation and digital zoom features for the input frames, through the dw100 hardware. Signed-off-by: Umang Jain <umang.jain@ideasonboard.com> --- drivers/media/platform/nxp/dw100/dw100.c | 73 ++++++++++++++++++------ 1 file changed, 56 insertions(+), 17 deletions(-)