Commit 8b834bff authored by Ming Lei's avatar Ming Lei Committed by Martin K. Petersen
Browse files

scsi: hpsa: fix selection of reply queue 



Since commit 84676c1f ("genirq/affinity: assign vectors to all
possible CPUs") we could end up with an MSI-X vector that did not have
any online CPUs mapped. This would lead to I/O hangs since there was no
CPU to receive the completion.

Retrieve IRQ affinity information using pci_irq_get_affinity() and use
this mapping to choose a reply queue.

[mkp: tweaked commit desc]

Cc: Hannes Reinecke <hare@suse.de>
Cc: "Martin K. Petersen" <martin.petersen@oracle.com>,
Cc: James Bottomley <james.bottomley@hansenpartnership.com>,
Cc: Christoph Hellwig <hch@lst.de>,
Cc: Don Brace <don.brace@microsemi.com>
Cc: Kashyap Desai <kashyap.desai@broadcom.com>
Cc: Laurence Oberman <loberman@redhat.com>
Cc: Meelis Roos <mroos@linux.ee>
Cc: Artem Bityutskiy <artem.bityutskiy@intel.com>
Cc: Mike Snitzer <snitzer@redhat.com>
Fixes: 84676c1f ("genirq/affinity: assign vectors to all possible CPUs")
Signed-off-by: default avatarMing Lei <ming.lei@redhat.com>
Tested-by: default avatarLaurence Oberman <loberman@redhat.com>
Tested-by: default avatarDon Brace <don.brace@microsemi.com>
Tested-by: default avatarArtem Bityutskiy <artem.bityutskiy@intel.com>
Acked-by: default avatarDon Brace <don.brace@microsemi.com>
Reviewed-by: default avatarChristoph Hellwig <hch@lst.de>
Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
parent 14bc1dff

drivers/scsi/hpsa.c

+54 −19
Original line number Diff line number Diff line
@@ -1045,11 +1045,7 @@ static void set_performant_mode(struct ctlr_info *h, struct CommandList *c, 
		c->busaddr |= 1 | (h->blockFetchTable[c->Header.SGList] << 1);

		if (unlikely(!h->msix_vectors))

			return;

		if (likely(reply_queue == DEFAULT_REPLY_QUEUE))

			c->Header.ReplyQueue =

				raw_smp_processor_id() % h->nreply_queues;

		else

			c->Header.ReplyQueue = reply_queue % h->nreply_queues;

		c->Header.ReplyQueue = reply_queue;

	}

}
@@ -1063,10 +1059,7 @@ static void set_ioaccel1_performant_mode(struct ctlr_info *h, 
	 * Tell the controller to post the reply to the queue for this

	 * processor.  This seems to give the best I/O throughput.

	 */

	if (likely(reply_queue == DEFAULT_REPLY_QUEUE))

		cp->ReplyQueue = smp_processor_id() % h->nreply_queues;

	else

		cp->ReplyQueue = reply_queue % h->nreply_queues;

	cp->ReplyQueue = reply_queue;

	/*

	 * Set the bits in the address sent down to include:

	 *  - performant mode bit (bit 0)
@@ -1087,10 +1080,7 @@ static void set_ioaccel2_tmf_performant_mode(struct ctlr_info *h, 
	/* Tell the controller to post the reply to the queue for this

	 * processor.  This seems to give the best I/O throughput.

	 */

	if (likely(reply_queue == DEFAULT_REPLY_QUEUE))

		cp->reply_queue = smp_processor_id() % h->nreply_queues;

	else

		cp->reply_queue = reply_queue % h->nreply_queues;

	cp->reply_queue = reply_queue;

	/* Set the bits in the address sent down to include:

	 *  - performant mode bit not used in ioaccel mode 2

	 *  - pull count (bits 0-3)
@@ -1109,10 +1099,7 @@ static void set_ioaccel2_performant_mode(struct ctlr_info *h, 
	 * Tell the controller to post the reply to the queue for this

	 * processor.  This seems to give the best I/O throughput.

	 */

	if (likely(reply_queue == DEFAULT_REPLY_QUEUE))

		cp->reply_queue = smp_processor_id() % h->nreply_queues;

	else

		cp->reply_queue = reply_queue % h->nreply_queues;

	cp->reply_queue = reply_queue;

	/*

	 * Set the bits in the address sent down to include:

	 *  - performant mode bit not used in ioaccel mode 2
@@ -1157,6 +1144,8 @@ static void __enqueue_cmd_and_start_io(struct ctlr_info *h, 
{

	dial_down_lockup_detection_during_fw_flash(h, c);

	atomic_inc(&h->commands_outstanding);



	reply_queue = h->reply_map[raw_smp_processor_id()];

	switch (c->cmd_type) {

	case CMD_IOACCEL1:

		set_ioaccel1_performant_mode(h, c, reply_queue);
@@ -7376,6 +7365,26 @@ static void hpsa_disable_interrupt_mode(struct ctlr_info *h) 
	h->msix_vectors = 0;

}



static void hpsa_setup_reply_map(struct ctlr_info *h)

{

	const struct cpumask *mask;

	unsigned int queue, cpu;



	for (queue = 0; queue < h->msix_vectors; queue++) {

		mask = pci_irq_get_affinity(h->pdev, queue);

		if (!mask)

			goto fallback;



		for_each_cpu(cpu, mask)

			h->reply_map[cpu] = queue;

	}

	return;



fallback:

	for_each_possible_cpu(cpu)

		h->reply_map[cpu] = 0;

}



/* If MSI/MSI-X is supported by the kernel we will try to enable it on

 * controllers that are capable. If not, we use legacy INTx mode.

 */
@@ -7771,6 +7780,10 @@ static int hpsa_pci_init(struct ctlr_info *h) 
	err = hpsa_interrupt_mode(h);

	if (err)

		goto clean1;



	/* setup mapping between CPU and reply queue */

	hpsa_setup_reply_map(h);



	err = hpsa_pci_find_memory_BAR(h->pdev, &h->paddr);

	if (err)

		goto clean2;	/* intmode+region, pci */
@@ -8480,6 +8493,28 @@ static struct workqueue_struct *hpsa_create_controller_wq(struct ctlr_info *h, 
	return wq;

}



static void hpda_free_ctlr_info(struct ctlr_info *h)

{

	kfree(h->reply_map);

	kfree(h);

}



static struct ctlr_info *hpda_alloc_ctlr_info(void)

{

	struct ctlr_info *h;



	h = kzalloc(sizeof(*h), GFP_KERNEL);

	if (!h)

		return NULL;



	h->reply_map = kzalloc(sizeof(*h->reply_map) * nr_cpu_ids, GFP_KERNEL);

	if (!h->reply_map) {

		kfree(h);

		return NULL;

	}

	return h;

}



static int hpsa_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)

{

	int dac, rc;
@@ -8517,7 +8552,7 @@ reinit_after_soft_reset: 
	 * the driver.  See comments in hpsa.h for more info.

	 */

	BUILD_BUG_ON(sizeof(struct CommandList) % COMMANDLIST_ALIGNMENT);

	h = kzalloc(sizeof(*h), GFP_KERNEL);

	h = hpda_alloc_ctlr_info();

	if (!h) {

		dev_err(&pdev->dev, "Failed to allocate controller head\n");

		return -ENOMEM;
@@ -8916,7 +8951,7 @@ static void hpsa_remove_one(struct pci_dev *pdev) 
	h->lockup_detected = NULL;			/* init_one 2 */

	/* (void) pci_disable_pcie_error_reporting(pdev); */	/* init_one 1 */



	kfree(h);					/* init_one 1 */

	hpda_free_ctlr_info(h);				/* init_one 1 */

}



static int hpsa_suspend(__attribute__((unused)) struct pci_dev *pdev,

drivers/scsi/hpsa.h

+1 −0
Original line number Diff line number Diff line
@@ -158,6 +158,7 @@ struct bmic_controller_parameters { 
#pragma pack()



struct ctlr_info {

	unsigned int *reply_map;

	int	ctlr;

	char	devname[8];

	char    *product_name;

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