diff mbox series

[v2,REPOST] scsi: be2iscsi: Replace irq_poll with threaded IRQ handler.

Message ID 20211202200556.qz7cjuktgxoum2u2@linutronix.de
State New
Headers show
Series [v2,REPOST] scsi: be2iscsi: Replace irq_poll with threaded IRQ handler. | expand

Commit Message

Sebastian Andrzej Siewior Dec. 2, 2021, 8:05 p.m. UTC
The driver is using irq_poll() (a NAPI like generic interface) for
completing individual I/O requests.
This could be replaced with threaded interrupts. The threaded interrupt
runs as a RT thread with priority 50-FIFO. It should run as the first
task after the interrupt unless a task with higher priority is active.
It can be interrupt by another hardware interrupt or a softirq.

This has been compile tested only. I'm interested if it causes any
regressions, improves the situation or neither.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
REPOST of
   https://https://lkml.kernel.org/r/.kernel.org/all/20211029074902.4fayed6mcltifgdz@linutronix.de/

v1…v2:
  - Properly initialize variables in be_isr_misx_th() as reported by the
    bot.

 drivers/scsi/be2iscsi/Kconfig    |   1 -
 drivers/scsi/be2iscsi/be.h       |   3 +-
 drivers/scsi/be2iscsi/be_iscsi.c |   8 +-
 drivers/scsi/be2iscsi/be_main.c  | 146 ++++++++++++++-----------------
 drivers/scsi/be2iscsi/be_main.h  |   2 +-
 5 files changed, 75 insertions(+), 85 deletions(-)

Comments

kernel test robot Dec. 3, 2021, 10:58 p.m. UTC | #1
Hi Sebastian,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on jejb-scsi/for-next]
[also build test WARNING on mkp-scsi/for-next v5.16-rc3 next-20211203]
[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]

url:    https://github.com/0day-ci/linux/commits/Sebastian-Andrzej-Siewior/scsi-be2iscsi-Replace-irq_poll-with-threaded-IRQ-handler/20211203-040851
base:   https://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi.git for-next
config: riscv-buildonly-randconfig-r002-20211203 (https://download.01.org/0day-ci/archive/20211204/202112040653.cszvYjJj-lkp@intel.com/config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project d30fcadf07ee552f20156ea90be2fdb54cb9cb08)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # install riscv cross compiling tool for clang build
        # apt-get install binutils-riscv64-linux-gnu
        # https://github.com/0day-ci/linux/commit/46ae6b75188a7c555a80135814182b82a0fad7c8
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Sebastian-Andrzej-Siewior/scsi-be2iscsi-Replace-irq_poll-with-threaded-IRQ-handler/20211203-040851
        git checkout 46ae6b75188a7c555a80135814182b82a0fad7c8
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=riscv SHELL=/bin/bash drivers/ata/ drivers/infiniband/sw/rxe/ drivers/scsi/be2iscsi/

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

>> drivers/scsi/be2iscsi/be_main.c:5392:33: warning: variable 'i' is uninitialized when used here [-Wuninitialized]
                   pbe_eq = &phwi_context->be_eq[i];
                                                 ^
   drivers/scsi/be2iscsi/be_main.c:5377:16: note: initialize the variable 'i' to silence this warning
           unsigned int i;
                         ^
                          = 0
   1 warning generated.


vim +/i +5392 drivers/scsi/be2iscsi/be_main.c

d1d5ca887c0ee6 Jitendra Bhivare  2016-08-19  5363  
d1d5ca887c0ee6 Jitendra Bhivare  2016-08-19  5364  /*
d1d5ca887c0ee6 Jitendra Bhivare  2016-08-19  5365   * beiscsi_disable_port()- Disable port and cleanup driver resources.
d1d5ca887c0ee6 Jitendra Bhivare  2016-08-19  5366   * This is called in HBA error handling and driver removal.
d1d5ca887c0ee6 Jitendra Bhivare  2016-08-19  5367   * @phba: Instance Priv structure
d1d5ca887c0ee6 Jitendra Bhivare  2016-08-19  5368   * @unload: indicate driver is unloading
d1d5ca887c0ee6 Jitendra Bhivare  2016-08-19  5369   *
d1d5ca887c0ee6 Jitendra Bhivare  2016-08-19  5370   * Free the OS and HW resources held by the driver
d1d5ca887c0ee6 Jitendra Bhivare  2016-08-19  5371   **/
d1d5ca887c0ee6 Jitendra Bhivare  2016-08-19  5372  static void beiscsi_disable_port(struct beiscsi_hba *phba, int unload)
d1d5ca887c0ee6 Jitendra Bhivare  2016-08-19  5373  {
d1d5ca887c0ee6 Jitendra Bhivare  2016-08-19  5374  	struct hwi_context_memory *phwi_context;
d1d5ca887c0ee6 Jitendra Bhivare  2016-08-19  5375  	struct hwi_controller *phwi_ctrlr;
d1d5ca887c0ee6 Jitendra Bhivare  2016-08-19  5376  	struct be_eq_obj *pbe_eq;
831488669a334e Christoph Hellwig 2017-01-13  5377  	unsigned int i;
d1d5ca887c0ee6 Jitendra Bhivare  2016-08-19  5378  
d1d5ca887c0ee6 Jitendra Bhivare  2016-08-19  5379  	if (!test_and_clear_bit(BEISCSI_HBA_ONLINE, &phba->state))
d1d5ca887c0ee6 Jitendra Bhivare  2016-08-19  5380  		return;
d1d5ca887c0ee6 Jitendra Bhivare  2016-08-19  5381  
d1d5ca887c0ee6 Jitendra Bhivare  2016-08-19  5382  	phwi_ctrlr = phba->phwi_ctrlr;
d1d5ca887c0ee6 Jitendra Bhivare  2016-08-19  5383  	phwi_context = phwi_ctrlr->phwi_ctxt;
d1d5ca887c0ee6 Jitendra Bhivare  2016-08-19  5384  	hwi_disable_intr(phba);
45371aa398c647 Jitendra Bhivare  2017-10-10  5385  	beiscsi_free_irqs(phba);
831488669a334e Christoph Hellwig 2017-01-13  5386  	pci_free_irq_vectors(phba->pcidev);
d1d5ca887c0ee6 Jitendra Bhivare  2016-08-19  5387  
d1d5ca887c0ee6 Jitendra Bhivare  2016-08-19  5388  	cancel_delayed_work_sync(&phba->eqd_update);
d1d5ca887c0ee6 Jitendra Bhivare  2016-08-19  5389  	cancel_work_sync(&phba->boot_work);
d1d5ca887c0ee6 Jitendra Bhivare  2016-08-19  5390  	/* WQ might be running cancel queued mcc_work if we are not exiting */
d1d5ca887c0ee6 Jitendra Bhivare  2016-08-19  5391  	if (!unload && beiscsi_hba_in_error(phba)) {
d1d5ca887c0ee6 Jitendra Bhivare  2016-08-19 @5392  		pbe_eq = &phwi_context->be_eq[i];
d1d5ca887c0ee6 Jitendra Bhivare  2016-08-19  5393  		cancel_work_sync(&pbe_eq->mcc_work);
d1d5ca887c0ee6 Jitendra Bhivare  2016-08-19  5394  	}
d1d5ca887c0ee6 Jitendra Bhivare  2016-08-19  5395  	hwi_cleanup_port(phba);
dd940972f36779 Jitendra Bhivare  2016-12-13  5396  	beiscsi_cleanup_port(phba);
d1d5ca887c0ee6 Jitendra Bhivare  2016-08-19  5397  }
d1d5ca887c0ee6 Jitendra Bhivare  2016-08-19  5398  

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
diff mbox series

Patch

diff --git a/drivers/scsi/be2iscsi/Kconfig b/drivers/scsi/be2iscsi/Kconfig
index 958c9b46ec787..0118b2a765caf 100644
--- a/drivers/scsi/be2iscsi/Kconfig
+++ b/drivers/scsi/be2iscsi/Kconfig
@@ -4,7 +4,6 @@  config BE2ISCSI
 	depends on PCI && SCSI && NET
 	select SCSI_ISCSI_ATTRS
 	select ISCSI_BOOT_SYSFS
-	select IRQ_POLL
 
 	help
 	This driver implements the iSCSI functionality for Emulex
diff --git a/drivers/scsi/be2iscsi/be.h b/drivers/scsi/be2iscsi/be.h
index 4c58a02590c7b..8623886810310 100644
--- a/drivers/scsi/be2iscsi/be.h
+++ b/drivers/scsi/be2iscsi/be.h
@@ -12,7 +12,7 @@ 
 
 #include <linux/pci.h>
 #include <linux/if_vlan.h>
-#include <linux/irq_poll.h>
+
 #define FW_VER_LEN	32
 #define MCC_Q_LEN	128
 #define MCC_CQ_LEN	256
@@ -90,7 +90,6 @@  struct be_eq_obj {
 	struct beiscsi_hba *phba;
 	struct be_queue_info *cq;
 	struct work_struct mcc_work; /* Work Item */
-	struct irq_poll	iopoll;
 };
 
 struct be_mcc_obj {
diff --git a/drivers/scsi/be2iscsi/be_iscsi.c b/drivers/scsi/be2iscsi/be_iscsi.c
index 8aeaddc93b167..e15d5c7ef611e 100644
--- a/drivers/scsi/be2iscsi/be_iscsi.c
+++ b/drivers/scsi/be2iscsi/be_iscsi.c
@@ -1224,15 +1224,17 @@  static void beiscsi_flush_cq(struct beiscsi_hba *phba)
 	struct be_eq_obj *pbe_eq;
 	struct hwi_controller *phwi_ctrlr;
 	struct hwi_context_memory *phwi_context;
+	struct pci_dev *pcidev;
 
 	phwi_ctrlr = phba->phwi_ctrlr;
 	phwi_context = phwi_ctrlr->phwi_ctxt;
+	pcidev = phba->pcidev;
 
 	for (i = 0; i < phba->num_cpus; i++) {
 		pbe_eq = &phwi_context->be_eq[i];
-		irq_poll_disable(&pbe_eq->iopoll);
-		beiscsi_process_cq(pbe_eq, BE2_MAX_NUM_CQ_PROC);
-		irq_poll_enable(&pbe_eq->iopoll);
+		disable_irq(pci_irq_vector(pcidev, i));
+		beiscsi_process_cq(pbe_eq);
+		enable_irq(pci_irq_vector(pcidev, i));
 	}
 }
 
diff --git a/drivers/scsi/be2iscsi/be_main.c b/drivers/scsi/be2iscsi/be_main.c
index ab55681145f8a..4dc4b840a17dc 100644
--- a/drivers/scsi/be2iscsi/be_main.c
+++ b/drivers/scsi/be2iscsi/be_main.c
@@ -35,7 +35,6 @@ 
 #include <linux/iscsi_boot_sysfs.h>
 #include <linux/module.h>
 #include <linux/bsg-lib.h>
-#include <linux/irq_poll.h>
 
 #include <scsi/libiscsi.h>
 #include <scsi/scsi_bsg_iscsi.h>
@@ -51,7 +50,6 @@ 
 #include "be_mgmt.h"
 #include "be_cmds.h"
 
-static unsigned int be_iopoll_budget = 10;
 static unsigned int be_max_phys_size = 64;
 static unsigned int enable_msix = 1;
 
@@ -59,7 +57,6 @@  MODULE_DESCRIPTION(DRV_DESC " " BUILD_STR);
 MODULE_VERSION(BUILD_STR);
 MODULE_AUTHOR("Emulex Corporation");
 MODULE_LICENSE("GPL");
-module_param(be_iopoll_budget, int, 0);
 module_param(enable_msix, int, 0);
 module_param(be_max_phys_size, uint, S_IRUGO);
 MODULE_PARM_DESC(be_max_phys_size,
@@ -699,6 +696,48 @@  static irqreturn_t be_isr_mcc(int irq, void *dev_id)
 	return IRQ_HANDLED;
 }
 
+static irqreturn_t be_iopoll(struct be_eq_obj *pbe_eq)
+{
+	struct beiscsi_hba *phba;
+	unsigned int ret, io_events;
+	struct be_eq_entry *eqe = NULL;
+	struct be_queue_info *eq;
+
+	phba = pbe_eq->phba;
+	if (beiscsi_hba_in_error(phba))
+		return IRQ_NONE;
+
+	io_events = 0;
+	eq = &pbe_eq->q;
+	eqe = queue_tail_node(eq);
+	while (eqe->dw[offsetof(struct amap_eq_entry, valid) / 32] &
+			EQE_VALID_MASK) {
+		AMAP_SET_BITS(struct amap_eq_entry, valid, eqe, 0);
+		queue_tail_inc(eq);
+		eqe = queue_tail_node(eq);
+		io_events++;
+	}
+	hwi_ring_eq_db(phba, eq->id, 1, io_events, 0, 1);
+
+	ret = beiscsi_process_cq(pbe_eq);
+	pbe_eq->cq_count += ret;
+	beiscsi_log(phba, KERN_INFO,
+		    BEISCSI_LOG_CONFIG | BEISCSI_LOG_IO,
+		    "BM_%d : rearm pbe_eq->q.id =%d ret %d\n",
+		    pbe_eq->q.id, ret);
+	if (!beiscsi_hba_in_error(phba))
+		hwi_ring_eq_db(phba, pbe_eq->q.id, 0, 0, 1, 1);
+
+	return IRQ_HANDLED;
+}
+
+static irqreturn_t be_isr_misx_th(int irq, void *dev_id)
+{
+	struct be_eq_obj *pbe_eq  = dev_id;
+
+	return be_iopoll(pbe_eq);
+}
+
 /**
  * be_isr_msix - The isr routine of the driver.
  * @irq: Not used
@@ -716,9 +755,22 @@  static irqreturn_t be_isr_msix(int irq, void *dev_id)
 	phba = pbe_eq->phba;
 	/* disable interrupt till iopoll completes */
 	hwi_ring_eq_db(phba, eq->id, 1,	0, 0, 1);
-	irq_poll_sched(&pbe_eq->iopoll);
 
-	return IRQ_HANDLED;
+	return IRQ_WAKE_THREAD;
+}
+
+static irqreturn_t be_isr_thread(int irq, void *dev_id)
+{
+	struct beiscsi_hba *phba;
+	struct hwi_controller *phwi_ctrlr;
+	struct hwi_context_memory *phwi_context;
+	struct be_eq_obj *pbe_eq;
+
+	phba = dev_id;
+	phwi_ctrlr = phba->phwi_ctrlr;
+	phwi_context = phwi_ctrlr->phwi_ctxt;
+	pbe_eq = &phwi_context->be_eq[0];
+	return be_iopoll(pbe_eq);
 }
 
 /**
@@ -738,6 +790,7 @@  static irqreturn_t be_isr(int irq, void *dev_id)
 	struct be_ctrl_info *ctrl;
 	struct be_eq_obj *pbe_eq;
 	int isr, rearm;
+	irqreturn_t ret;
 
 	phba = dev_id;
 	ctrl = &phba->ctrl;
@@ -777,10 +830,11 @@  static irqreturn_t be_isr(int irq, void *dev_id)
 		/* rearm for MCCQ */
 		rearm = 1;
 	}
+	ret = IRQ_HANDLED;
 	if (io_events)
-		irq_poll_sched(&pbe_eq->iopoll);
+		ret = IRQ_WAKE_THREAD;
 	hwi_ring_eq_db(phba, eq->id, 0, (io_events + mcc_events), rearm, 1);
-	return IRQ_HANDLED;
+	return ret;
 }
 
 static void beiscsi_free_irqs(struct beiscsi_hba *phba)
@@ -822,9 +876,10 @@  static int beiscsi_init_irqs(struct beiscsi_hba *phba)
 				goto free_msix_irqs;
 			}
 
-			ret = request_irq(pci_irq_vector(pcidev, i),
-					  be_isr_msix, 0, phba->msi_name[i],
-					  &phwi_context->be_eq[i]);
+			ret = request_threaded_irq(pci_irq_vector(pcidev, i),
+						   be_isr_msix, be_isr_misx_th,
+						   0, phba->msi_name[i],
+						   &phwi_context->be_eq[i]);
 			if (ret) {
 				beiscsi_log(phba, KERN_ERR, BEISCSI_LOG_INIT,
 					    "BM_%d : %s-Failed to register msix for i = %d\n",
@@ -850,8 +905,8 @@  static int beiscsi_init_irqs(struct beiscsi_hba *phba)
 		}
 
 	} else {
-		ret = request_irq(pcidev->irq, be_isr, IRQF_SHARED,
-				  "beiscsi", phba);
+		ret = request_threaded_irq(pcidev->irq, be_isr, be_isr_thread,
+					   IRQF_SHARED, "beiscsi", phba);
 		if (ret) {
 			beiscsi_log(phba, KERN_ERR, BEISCSI_LOG_INIT,
 				    "BM_%d : %s-Failed to register irq\n",
@@ -1842,12 +1897,11 @@  static void beiscsi_mcc_work(struct work_struct *work)
 /**
  * beiscsi_process_cq()- Process the Completion Queue
  * @pbe_eq: Event Q on which the Completion has come
- * @budget: Max number of events to processed
  *
  * return
  *     Number of Completion Entries processed.
  **/
-unsigned int beiscsi_process_cq(struct be_eq_obj *pbe_eq, int budget)
+unsigned int beiscsi_process_cq(struct be_eq_obj *pbe_eq)
 {
 	struct be_queue_info *cq;
 	struct sol_cqe *sol;
@@ -2021,55 +2075,12 @@  unsigned int beiscsi_process_cq(struct be_eq_obj *pbe_eq, int budget)
 		queue_tail_inc(cq);
 		sol = queue_tail_node(cq);
 		num_processed++;
-		if (total == budget)
-			break;
 	}
 
 	hwi_ring_cq_db(phba, cq->id, num_processed, 1);
 	return total;
 }
 
-static int be_iopoll(struct irq_poll *iop, int budget)
-{
-	unsigned int ret, io_events;
-	struct beiscsi_hba *phba;
-	struct be_eq_obj *pbe_eq;
-	struct be_eq_entry *eqe = NULL;
-	struct be_queue_info *eq;
-
-	pbe_eq = container_of(iop, struct be_eq_obj, iopoll);
-	phba = pbe_eq->phba;
-	if (beiscsi_hba_in_error(phba)) {
-		irq_poll_complete(iop);
-		return 0;
-	}
-
-	io_events = 0;
-	eq = &pbe_eq->q;
-	eqe = queue_tail_node(eq);
-	while (eqe->dw[offsetof(struct amap_eq_entry, valid) / 32] &
-			EQE_VALID_MASK) {
-		AMAP_SET_BITS(struct amap_eq_entry, valid, eqe, 0);
-		queue_tail_inc(eq);
-		eqe = queue_tail_node(eq);
-		io_events++;
-	}
-	hwi_ring_eq_db(phba, eq->id, 1, io_events, 0, 1);
-
-	ret = beiscsi_process_cq(pbe_eq, budget);
-	pbe_eq->cq_count += ret;
-	if (ret < budget) {
-		irq_poll_complete(iop);
-		beiscsi_log(phba, KERN_INFO,
-			    BEISCSI_LOG_CONFIG | BEISCSI_LOG_IO,
-			    "BM_%d : rearm pbe_eq->q.id =%d ret %d\n",
-			    pbe_eq->q.id, ret);
-		if (!beiscsi_hba_in_error(phba))
-			hwi_ring_eq_db(phba, pbe_eq->q.id, 0, 0, 1, 1);
-	}
-	return ret;
-}
-
 static void
 hwi_write_sgl_v2(struct iscsi_wrb *pwrb, struct scatterlist *sg,
 		  unsigned int num_sg, struct beiscsi_io_task *io_task)
@@ -5311,10 +5322,6 @@  static int beiscsi_enable_port(struct beiscsi_hba *phba)
 
 	phwi_ctrlr = phba->phwi_ctrlr;
 	phwi_context = phwi_ctrlr->phwi_ctxt;
-	for (i = 0; i < phba->num_cpus; i++) {
-		pbe_eq = &phwi_context->be_eq[i];
-		irq_poll_init(&pbe_eq->iopoll, be_iopoll_budget, be_iopoll);
-	}
 
 	i = (phba->pcidev->msix_enabled) ? i : 0;
 	/* Work item for MCC handling */
@@ -5347,10 +5354,6 @@  static int beiscsi_enable_port(struct beiscsi_hba *phba)
 	return 0;
 
 cleanup_port:
-	for (i = 0; i < phba->num_cpus; i++) {
-		pbe_eq = &phwi_context->be_eq[i];
-		irq_poll_disable(&pbe_eq->iopoll);
-	}
 	hwi_cleanup_port(phba);
 
 disable_msix:
@@ -5382,10 +5385,6 @@  static void beiscsi_disable_port(struct beiscsi_hba *phba, int unload)
 	beiscsi_free_irqs(phba);
 	pci_free_irq_vectors(phba->pcidev);
 
-	for (i = 0; i < phba->num_cpus; i++) {
-		pbe_eq = &phwi_context->be_eq[i];
-		irq_poll_disable(&pbe_eq->iopoll);
-	}
 	cancel_delayed_work_sync(&phba->eqd_update);
 	cancel_work_sync(&phba->boot_work);
 	/* WQ might be running cancel queued mcc_work if we are not exiting */
@@ -5640,11 +5639,6 @@  static int beiscsi_dev_probe(struct pci_dev *pcidev,
 	phwi_ctrlr = phba->phwi_ctrlr;
 	phwi_context = phwi_ctrlr->phwi_ctxt;
 
-	for (i = 0; i < phba->num_cpus; i++) {
-		pbe_eq = &phwi_context->be_eq[i];
-		irq_poll_init(&pbe_eq->iopoll, be_iopoll_budget, be_iopoll);
-	}
-
 	i = (phba->pcidev->msix_enabled) ? i : 0;
 	/* Work item for MCC handling */
 	pbe_eq = &phwi_context->be_eq[i];
@@ -5701,10 +5695,6 @@  static int beiscsi_dev_probe(struct pci_dev *pcidev,
 	hwi_disable_intr(phba);
 	beiscsi_free_irqs(phba);
 disable_iopoll:
-	for (i = 0; i < phba->num_cpus; i++) {
-		pbe_eq = &phwi_context->be_eq[i];
-		irq_poll_disable(&pbe_eq->iopoll);
-	}
 	destroy_workqueue(phba->wq);
 free_twq:
 	hwi_cleanup_port(phba);
diff --git a/drivers/scsi/be2iscsi/be_main.h b/drivers/scsi/be2iscsi/be_main.h
index 98977c0700f1a..5c0e54eaf9e99 100644
--- a/drivers/scsi/be2iscsi/be_main.h
+++ b/drivers/scsi/be2iscsi/be_main.h
@@ -799,7 +799,7 @@  void hwi_ring_cq_db(struct beiscsi_hba *phba,
 		     unsigned int id, unsigned int num_processed,
 		     unsigned char rearm);
 
-unsigned int beiscsi_process_cq(struct be_eq_obj *pbe_eq, int budget);
+unsigned int beiscsi_process_cq(struct be_eq_obj *pbe_eq);
 void beiscsi_process_mcc_cq(struct beiscsi_hba *phba);
 
 struct pdu_nop_out {