| Message ID | 20220104072658.69756-5-marcan@marcan.st |
|---|---|
| State | New |
| Headers | show |
| Series | brcmfmac: Support Apple T2 and M1 platforms | expand |
04.01.2022 11:43, Hector Martin пишет: >>> +static int brcm_alt_fw_paths(const char *path, const char *board_type, >>> + const char *alt_paths[BRCMF_FW_MAX_ALT_PATHS])> { >>> char alt_path[BRCMF_FW_NAME_LEN]; >>> const char *suffix; >>> >>> + memset(alt_paths, 0, array_size(sizeof(*alt_paths), >>> + BRCMF_FW_MAX_ALT_PATHS)); >> You don't need to use array_size() since size of a fixed array is >> already known. >> >> memset(alt_paths, 0, sizeof(alt_paths)); > It's a function argument, so that doesn't work and actually throws a > warning. Array function argument notation is informative only; they > behave strictly equivalent to pointers. Try it: > > $ cat test.c > #include <stdio.h> > > void foo(char x[42]) > { > printf("%ld\n", sizeof(x)); > } > > int main() { > char x[42]; > > foo(x); > } > $ gcc test.c > test.c: In function ‘foo’: > test.c:5:31: warning: ‘sizeof’ on array function parameter ‘x’ will > return size of ‘char *’ [-Wsizeof-array-argument] > 5 | printf("%ld\n", sizeof(x)); > | ^ > test.c:3:15: note: declared here > 3 | void foo(char x[42]) > | ~~~~~^~~~~ > $ ./a.out > 8 Then please use "const char **alt_paths" for the function argument to make code cleaner and add another argument to pass the number of array elements. static int brcm_alt_fw_paths(const char *path, const char *board_type, const char **alt_paths, unsigned int num_paths) { size_t alt_paths_size = array_size(sizeof(*alt_paths), num_paths); memset(alt_paths, 0, alt_paths_size); } ... Maybe even better create a dedicated struct for the alt_paths: struct brcmf_fw_alt_paths { const char *alt_paths[BRCMF_FW_MAX_ALT_PATHS]; unsigned int index; }; and then use the ".index" in the brcm_free_alt_fw_paths(). I suppose this will make code a bit nicer and easier to follow.
04.01.2022 10:26, Hector Martin пишет: > +static int brcm_alt_fw_paths(const char *path, const char *board_type, > + const char *alt_paths[BRCMF_FW_MAX_ALT_PATHS]) > { ... > +static void > +brcm_free_alt_fw_paths(const char *alt_paths[BRCMF_FW_MAX_ALT_PATHS]) > +{ I'd rename this funcs to brcm_init/deinit_alt_fw_paths(), for consistency and clarity.
On 1/4/2022 8:26 AM, Hector Martin wrote: > Apple platforms have firmware and config files identified with multiple > dimensions. We want to be able to find the most specific firmware > available for any given platform, progressively trying more general > firmwares. > > First, add support for having multiple alternate firmware paths. Reviewed-by: Arend van Spriel <arend.vanspriel@broadcom.com> > Acked-by: Linus Walleij <linus.walleij@linaro.org> > Signed-off-by: Hector Martin <marcan@marcan.st> > --- > .../broadcom/brcm80211/brcmfmac/firmware.c | 75 ++++++++++++++----- > .../broadcom/brcm80211/brcmfmac/firmware.h | 2 + > 2 files changed, 59 insertions(+), 18 deletions(-) > > diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/firmware.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/firmware.c > index 0497b721136a..7570dbf22cdd 100644 > --- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/firmware.c > +++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/firmware.c > @@ -427,6 +427,8 @@ void brcmf_fw_nvram_free(void *nvram) > struct brcmf_fw { > struct device *dev; > struct brcmf_fw_request *req; > + const char *alt_paths[BRCMF_FW_MAX_ALT_PATHS]; > + int alt_index; > u32 curpos; > void (*done)(struct device *dev, int err, struct brcmf_fw_request *req); > }; > @@ -592,14 +594,18 @@ static int brcmf_fw_complete_request(const struct firmware *fw, > return (cur->flags & BRCMF_FW_REQF_OPTIONAL) ? 0 : ret; > } > > -static char *brcm_alt_fw_path(const char *path, const char *board_type) > +static int brcm_alt_fw_paths(const char *path, const char *board_type, > + const char *alt_paths[BRCMF_FW_MAX_ALT_PATHS]) > { > char alt_path[BRCMF_FW_NAME_LEN]; > const char *suffix; > > + memset(alt_paths, 0, array_size(sizeof(*alt_paths), > + BRCMF_FW_MAX_ALT_PATHS)); > + > suffix = strrchr(path, '.'); > if (!suffix || suffix == path) > - return NULL; > + return -EINVAL; > > /* strip extension at the end */ > strscpy(alt_path, path, BRCMF_FW_NAME_LEN); > @@ -609,7 +615,18 @@ static char *brcm_alt_fw_path(const char *path, const char *board_type) > strlcat(alt_path, board_type, BRCMF_FW_NAME_LEN); > strlcat(alt_path, suffix, BRCMF_FW_NAME_LEN); > > - return kstrdup(alt_path, GFP_KERNEL); > + alt_paths[0] = kstrdup(alt_path, GFP_KERNEL); > + > + return 0; > +} > + > +static void > +brcm_free_alt_fw_paths(const char *alt_paths[BRCMF_FW_MAX_ALT_PATHS]) > +{ > + unsigned int i; > + > + for (i = 0; alt_paths[i]; i++) > + kfree(alt_paths[i]); > } > > static int brcmf_fw_request_firmware(const struct firmware **fw, > @@ -617,19 +634,25 @@ static int brcmf_fw_request_firmware(const struct firmware **fw, > { > struct brcmf_fw_item *cur = &fwctx->req->items[fwctx->curpos]; > int ret; > + unsigned int i; > > /* Files can be board-specific, first try a board-specific path */ > if (fwctx->req->board_type) { > - char *alt_path; > + const char *alt_paths[BRCMF_FW_MAX_ALT_PATHS]; > > - alt_path = brcm_alt_fw_path(cur->path, fwctx->req->board_type); > - if (!alt_path) > + if (brcm_alt_fw_paths(cur->path, fwctx->req->board_type, > + alt_paths) != 0) > goto fallback; > > - ret = request_firmware(fw, alt_path, fwctx->dev); > - kfree(alt_path); > - if (ret == 0) > - return ret; > + for (i = 0; i < BRCMF_FW_MAX_ALT_PATHS && alt_paths[i]; i++) { > + ret = firmware_request_nowarn(fw, alt_paths[i], > + fwctx->dev); > + if (ret == 0) { > + brcm_free_alt_fw_paths(alt_paths); > + return ret; > + } > + } > + brcm_free_alt_fw_paths(alt_paths); > } > > fallback: > @@ -641,6 +664,8 @@ static void brcmf_fw_request_done(const struct firmware *fw, void *ctx) > struct brcmf_fw *fwctx = ctx; > int ret; > > + brcm_free_alt_fw_paths(fwctx->alt_paths); > + > ret = brcmf_fw_complete_request(fw, fwctx); > > while (ret == 0 && ++fwctx->curpos < fwctx->req->n_items) { > @@ -662,13 +687,27 @@ static void brcmf_fw_request_done_alt_path(const struct firmware *fw, void *ctx) > struct brcmf_fw_item *first = &fwctx->req->items[0]; > int ret = 0; > > - /* Fall back to canonical path if board firmware not found */ > - if (!fw) > + if (fw) { > + brcmf_fw_request_done(fw, ctx); > + return; > + } > + > + fwctx->alt_index++; > + if (fwctx->alt_index < BRCMF_FW_MAX_ALT_PATHS && > + fwctx->alt_paths[fwctx->alt_index]) { > + /* Try the next alt firmware */ > + ret = request_firmware_nowait(THIS_MODULE, true, > + fwctx->alt_paths[fwctx->alt_index], > + fwctx->dev, GFP_KERNEL, fwctx, > + brcmf_fw_request_done_alt_path); > + } else { > + /* Fall back to canonical path if board firmware not found */ > ret = request_firmware_nowait(THIS_MODULE, true, first->path, > fwctx->dev, GFP_KERNEL, fwctx, > brcmf_fw_request_done); > + } > > - if (fw || ret < 0) > + if (ret < 0) > brcmf_fw_request_done(fw, ctx); > } > > @@ -693,7 +732,6 @@ int brcmf_fw_get_firmwares(struct device *dev, struct brcmf_fw_request *req, > { > struct brcmf_fw_item *first = &req->items[0]; > struct brcmf_fw *fwctx; > - char *alt_path; > int ret; > > brcmf_dbg(TRACE, "enter: dev=%s\n", dev_name(dev)); > @@ -712,12 +750,13 @@ int brcmf_fw_get_firmwares(struct device *dev, struct brcmf_fw_request *req, > fwctx->done = fw_cb; > > /* First try alternative board-specific path if any */ > - alt_path = brcm_alt_fw_path(first->path, fwctx->req->board_type); > - if (alt_path) { > - ret = request_firmware_nowait(THIS_MODULE, true, alt_path, > + if (brcm_alt_fw_paths(first->path, req->board_type, > + fwctx->alt_paths) == 0) { > + fwctx->alt_index = 0; > + ret = request_firmware_nowait(THIS_MODULE, true, > + fwctx->alt_paths[0], > fwctx->dev, GFP_KERNEL, fwctx, > brcmf_fw_request_done_alt_path); > - kfree(alt_path); > } else { > ret = request_firmware_nowait(THIS_MODULE, true, first->path, > fwctx->dev, GFP_KERNEL, fwctx, > diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/firmware.h b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/firmware.h > index e290dec9c53d..7f4e6e359c82 100644 > --- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/firmware.h > +++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/firmware.h > @@ -11,6 +11,8 @@ > > #define BRCMF_FW_DEFAULT_PATH "brcm/" > > +#define BRCMF_FW_MAX_ALT_PATHS 8 > + Any motivation to have 8 here today? In patch #9 I see a list of 6 paths in the commit message so you need 6 and rounded up here to power of 2? > /** > * struct brcmf_firmware_mapping - Used to map chipid/revmask to firmware > * filename and nvram filename. Each bus type implementation should create
On 2022/01/06 19:43, Arend van Spriel wrote: >> diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/firmware.h b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/firmware.h >> index e290dec9c53d..7f4e6e359c82 100644 >> --- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/firmware.h >> +++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/firmware.h >> @@ -11,6 +11,8 @@ >> >> #define BRCMF_FW_DEFAULT_PATH "brcm/" >> >> +#define BRCMF_FW_MAX_ALT_PATHS 8 >> + > > Any motivation to have 8 here today? In patch #9 I see a list of 6 paths > in the commit message so you need 6 and rounded up here to power of 2? > Heh, yeah, that's just my powers-of-two-are-nice-numbers habit. I can drop it down to 6 if you prefer.
05.01.2022 16:22, Hector Martin пишет: > On 05/01/2022 07.09, Dmitry Osipenko wrote: >> 04.01.2022 11:43, Hector Martin пишет: >>>>> +static int brcm_alt_fw_paths(const char *path, const char *board_type, >>>>> + const char *alt_paths[BRCMF_FW_MAX_ALT_PATHS])> { >>>>> char alt_path[BRCMF_FW_NAME_LEN]; >>>>> const char *suffix; >>>>> >>>>> + memset(alt_paths, 0, array_size(sizeof(*alt_paths), >>>>> + BRCMF_FW_MAX_ALT_PATHS)); >>>> You don't need to use array_size() since size of a fixed array is >>>> already known. >>>> >>>> memset(alt_paths, 0, sizeof(alt_paths)); >>> It's a function argument, so that doesn't work and actually throws a >>> warning. Array function argument notation is informative only; they >>> behave strictly equivalent to pointers. Try it: >>> >>> $ cat test.c >>> #include <stdio.h> >>> >>> void foo(char x[42]) >>> { >>> printf("%ld\n", sizeof(x)); >>> } >>> >>> int main() { >>> char x[42]; >>> >>> foo(x); >>> } >>> $ gcc test.c >>> test.c: In function ‘foo’: >>> test.c:5:31: warning: ‘sizeof’ on array function parameter ‘x’ will >>> return size of ‘char *’ [-Wsizeof-array-argument] >>> 5 | printf("%ld\n", sizeof(x)); >>> | ^ >>> test.c:3:15: note: declared here >>> 3 | void foo(char x[42]) >>> | ~~~~~^~~~~ >>> $ ./a.out >>> 8 >> >> Then please use "const char **alt_paths" for the function argument to >> make code cleaner and add another argument to pass the number of array >> elements. > > So you want me to do the ARRAY_SIZE at the caller side then? > >> >> static int brcm_alt_fw_paths(const char *path, const char *board_type, >> const char **alt_paths, unsigned int num_paths) >> { >> size_t alt_paths_size = array_size(sizeof(*alt_paths), num_paths); >> >> memset(alt_paths, 0, alt_paths_size); >> } >> >> ... >> >> Maybe even better create a dedicated struct for the alt_paths: >> >> struct brcmf_fw_alt_paths { >> const char *alt_paths[BRCMF_FW_MAX_ALT_PATHS]; >> unsigned int index; >> }; >> >> and then use the ".index" in the brcm_free_alt_fw_paths(). I suppose >> this will make code a bit nicer and easier to follow. >> > > I'm confused; the array size is constant. What would index contain and > why would would brcm_free_alt_fw_paths use it? Just as an iterator > variable instead of using a local variable? Or do you mean count? Yes, use index for the count of active entries in the alt_paths[]. for (i = 0; i < alt_paths.index; i++) kfree(alt_paths.path[i]); alt_paths.index = 0; or while (alt_paths.index) kfree(alt_paths.path[--alt_paths.index]); > Though, to be honest, at this point I'm considering rethinking the whole > patch for this mechanism because I'm not terribly happy with the current > approach and clearly you aren't either :-) Maybe it makes more sense to > stop trying to compute all the alt_paths ahead of time, and just have > the function compute a single one to be used just-in-time at firmware > request time, and just iterate over board_types. > The just-in-time approach sounds like a good idea.
On Thu, Jan 6, 2022 at 7:40 PM Dmitry Osipenko <digetx@gmail.com> wrote: > 05.01.2022 16:22, Hector Martin пишет: > > On 05/01/2022 07.09, Dmitry Osipenko wrote: ... > > I'm confused; the array size is constant. What would index contain and > > why would would brcm_free_alt_fw_paths use it? Just as an iterator > > variable instead of using a local variable? Or do you mean count? > > Yes, use index for the count of active entries in the alt_paths[]. > > for (i = 0; i < alt_paths.index; i++) > kfree(alt_paths.path[i]); > > alt_paths.index = 0; > > or > > while (alt_paths.index) > kfree(alt_paths.path[--alt_paths.index]); Usual pattern is while (x--) kfree(x); easier to read, extend (if needed).
06.01.2022 20:58, Andy Shevchenko пишет: > On Thu, Jan 6, 2022 at 7:40 PM Dmitry Osipenko <digetx@gmail.com> wrote: >> 05.01.2022 16:22, Hector Martin пишет: >>> On 05/01/2022 07.09, Dmitry Osipenko wrote: > > ... > >>> I'm confused; the array size is constant. What would index contain and >>> why would would brcm_free_alt_fw_paths use it? Just as an iterator >>> variable instead of using a local variable? Or do you mean count? >> >> Yes, use index for the count of active entries in the alt_paths[]. >> >> for (i = 0; i < alt_paths.index; i++) >> kfree(alt_paths.path[i]); >> >> alt_paths.index = 0; >> >> or >> >> while (alt_paths.index) >> kfree(alt_paths.path[--alt_paths.index]); > > Usual pattern is > > while (x--) > kfree(x); > > easier to read, extend (if needed). > That is indeed a usual patter for the driver removal code paths. I didn't like to have index of struct brcmf_fw underflowed, but I see now that fwctx is dynamically created and freed during driver probe, so it should be fine to use that usual pattern here too.
On Fri, Jan 7, 2022 at 5:12 AM Dmitry Osipenko <digetx@gmail.com> wrote: > 06.01.2022 20:58, Andy Shevchenko пишет: > > On Thu, Jan 6, 2022 at 7:40 PM Dmitry Osipenko <digetx@gmail.com> wrote: > >> 05.01.2022 16:22, Hector Martin пишет: ... > >> while (alt_paths.index) > >> kfree(alt_paths.path[--alt_paths.index]); > > > > Usual pattern is > > > > while (x--) > > kfree(x); I have to elaborate that my point is to have postdecrement in the while() instead of doing predecrement in its body. So the above example will look while (alt_paths.index--) kfree(alt_paths.path[alt_paths.index]); > > easier to read, extend (if needed). > > That is indeed a usual patter for the driver removal code paths. I > didn't like to have index of struct brcmf_fw underflowed, but I see now > that fwctx is dynamically created and freed during driver probe, so it > should be fine to use that usual pattern here too.
diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/firmware.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/firmware.c index 0497b721136a..7570dbf22cdd 100644 --- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/firmware.c +++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/firmware.c @@ -427,6 +427,8 @@ void brcmf_fw_nvram_free(void *nvram) struct brcmf_fw { struct device *dev; struct brcmf_fw_request *req; + const char *alt_paths[BRCMF_FW_MAX_ALT_PATHS]; + int alt_index; u32 curpos; void (*done)(struct device *dev, int err, struct brcmf_fw_request *req); }; @@ -592,14 +594,18 @@ static int brcmf_fw_complete_request(const struct firmware *fw, return (cur->flags & BRCMF_FW_REQF_OPTIONAL) ? 0 : ret; } -static char *brcm_alt_fw_path(const char *path, const char *board_type) +static int brcm_alt_fw_paths(const char *path, const char *board_type, + const char *alt_paths[BRCMF_FW_MAX_ALT_PATHS]) { char alt_path[BRCMF_FW_NAME_LEN]; const char *suffix; + memset(alt_paths, 0, array_size(sizeof(*alt_paths), + BRCMF_FW_MAX_ALT_PATHS)); + suffix = strrchr(path, '.'); if (!suffix || suffix == path) - return NULL; + return -EINVAL; /* strip extension at the end */ strscpy(alt_path, path, BRCMF_FW_NAME_LEN); @@ -609,7 +615,18 @@ static char *brcm_alt_fw_path(const char *path, const char *board_type) strlcat(alt_path, board_type, BRCMF_FW_NAME_LEN); strlcat(alt_path, suffix, BRCMF_FW_NAME_LEN); - return kstrdup(alt_path, GFP_KERNEL); + alt_paths[0] = kstrdup(alt_path, GFP_KERNEL); + + return 0; +} + +static void +brcm_free_alt_fw_paths(const char *alt_paths[BRCMF_FW_MAX_ALT_PATHS]) +{ + unsigned int i; + + for (i = 0; alt_paths[i]; i++) + kfree(alt_paths[i]); } static int brcmf_fw_request_firmware(const struct firmware **fw, @@ -617,19 +634,25 @@ static int brcmf_fw_request_firmware(const struct firmware **fw, { struct brcmf_fw_item *cur = &fwctx->req->items[fwctx->curpos]; int ret; + unsigned int i; /* Files can be board-specific, first try a board-specific path */ if (fwctx->req->board_type) { - char *alt_path; + const char *alt_paths[BRCMF_FW_MAX_ALT_PATHS]; - alt_path = brcm_alt_fw_path(cur->path, fwctx->req->board_type); - if (!alt_path) + if (brcm_alt_fw_paths(cur->path, fwctx->req->board_type, + alt_paths) != 0) goto fallback; - ret = request_firmware(fw, alt_path, fwctx->dev); - kfree(alt_path); - if (ret == 0) - return ret; + for (i = 0; i < BRCMF_FW_MAX_ALT_PATHS && alt_paths[i]; i++) { + ret = firmware_request_nowarn(fw, alt_paths[i], + fwctx->dev); + if (ret == 0) { + brcm_free_alt_fw_paths(alt_paths); + return ret; + } + } + brcm_free_alt_fw_paths(alt_paths); } fallback: @@ -641,6 +664,8 @@ static void brcmf_fw_request_done(const struct firmware *fw, void *ctx) struct brcmf_fw *fwctx = ctx; int ret; + brcm_free_alt_fw_paths(fwctx->alt_paths); + ret = brcmf_fw_complete_request(fw, fwctx); while (ret == 0 && ++fwctx->curpos < fwctx->req->n_items) { @@ -662,13 +687,27 @@ static void brcmf_fw_request_done_alt_path(const struct firmware *fw, void *ctx) struct brcmf_fw_item *first = &fwctx->req->items[0]; int ret = 0; - /* Fall back to canonical path if board firmware not found */ - if (!fw) + if (fw) { + brcmf_fw_request_done(fw, ctx); + return; + } + + fwctx->alt_index++; + if (fwctx->alt_index < BRCMF_FW_MAX_ALT_PATHS && + fwctx->alt_paths[fwctx->alt_index]) { + /* Try the next alt firmware */ + ret = request_firmware_nowait(THIS_MODULE, true, + fwctx->alt_paths[fwctx->alt_index], + fwctx->dev, GFP_KERNEL, fwctx, + brcmf_fw_request_done_alt_path); + } else { + /* Fall back to canonical path if board firmware not found */ ret = request_firmware_nowait(THIS_MODULE, true, first->path, fwctx->dev, GFP_KERNEL, fwctx, brcmf_fw_request_done); + } - if (fw || ret < 0) + if (ret < 0) brcmf_fw_request_done(fw, ctx); } @@ -693,7 +732,6 @@ int brcmf_fw_get_firmwares(struct device *dev, struct brcmf_fw_request *req, { struct brcmf_fw_item *first = &req->items[0]; struct brcmf_fw *fwctx; - char *alt_path; int ret; brcmf_dbg(TRACE, "enter: dev=%s\n", dev_name(dev)); @@ -712,12 +750,13 @@ int brcmf_fw_get_firmwares(struct device *dev, struct brcmf_fw_request *req, fwctx->done = fw_cb; /* First try alternative board-specific path if any */ - alt_path = brcm_alt_fw_path(first->path, fwctx->req->board_type); - if (alt_path) { - ret = request_firmware_nowait(THIS_MODULE, true, alt_path, + if (brcm_alt_fw_paths(first->path, req->board_type, + fwctx->alt_paths) == 0) { + fwctx->alt_index = 0; + ret = request_firmware_nowait(THIS_MODULE, true, + fwctx->alt_paths[0], fwctx->dev, GFP_KERNEL, fwctx, brcmf_fw_request_done_alt_path); - kfree(alt_path); } else { ret = request_firmware_nowait(THIS_MODULE, true, first->path, fwctx->dev, GFP_KERNEL, fwctx, diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/firmware.h b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/firmware.h index e290dec9c53d..7f4e6e359c82 100644 --- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/firmware.h +++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/firmware.h @@ -11,6 +11,8 @@ #define BRCMF_FW_DEFAULT_PATH "brcm/" +#define BRCMF_FW_MAX_ALT_PATHS 8 + /** * struct brcmf_firmware_mapping - Used to map chipid/revmask to firmware * filename and nvram filename. Each bus type implementation should create