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scsi: megaraid_sas: fix selection of reply queue 

Since commit 84676c1f21 ("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: Mike Snitzer <snitzer@redhat.com>
Cc: Meelis Roos <mroos@linux.ee>
Cc: Artem Bityutskiy <artem.bityutskiy@intel.com>
Fixes: 84676c1f21 ("genirq/affinity: assign vectors to all possible CPUs")
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Acked-by: Kashyap Desai <kashyap.desai@broadcom.com>
Tested-by: Kashyap Desai <kashyap.desai@broadcom.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Tested-by: Artem Bityutskiy <artem.bityutskiy@intel.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
zero-colors
Ming Lei 2018-03-13 17:42:40 +08:00 committed by Martin K. Petersen
parent 8b834bff1b
commit adbe552349
3 changed files with 41 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/scsi/megaraid/megaraid_sas.h
View File

@ -2128,6 +2128,7 @@ enum MR_PD_TYPE {
struct megasas_instance {
unsigned int *reply_map;
__le32 *producer;
dma_addr_t producer_h;
__le32 *consumer;

39
drivers/scsi/megaraid/megaraid_sas_base.c
View File

@ -5165,6 +5165,26 @@ skip_alloc:
instance->use_seqnum_jbod_fp = false;
}
static void megasas_setup_reply_map(struct megasas_instance *instance)
{
const struct cpumask *mask;
unsigned int queue, cpu;
for (queue = 0; queue < instance->msix_vectors; queue++) {
mask = pci_irq_get_affinity(instance->pdev, queue);
if (!mask)
goto fallback;
for_each_cpu(cpu, mask)
instance->reply_map[cpu] = queue;
}
return;
fallback:
for_each_possible_cpu(cpu)
instance->reply_map[cpu] = cpu % instance->msix_vectors;
}
/**
* megasas_init_fw - Initializes the FW
* @instance: Adapter soft state
@ -5343,6 +5363,8 @@ static int megasas_init_fw(struct megasas_instance *instance)
goto fail_setup_irqs;
}
megasas_setup_reply_map(instance);
dev_info(&instance->pdev->dev,
"firmware supports msix\t: (%d)", fw_msix_count);
dev_info(&instance->pdev->dev,
@ -6123,20 +6145,29 @@ static inline int megasas_alloc_mfi_ctrl_mem(struct megasas_instance *instance)
*/
static int megasas_alloc_ctrl_mem(struct megasas_instance *instance)
{
instance->reply_map = kzalloc(sizeof(unsigned int) * nr_cpu_ids,
GFP_KERNEL);
if (!instance->reply_map)
return -ENOMEM;
switch (instance->adapter_type) {
case MFI_SERIES:
if (megasas_alloc_mfi_ctrl_mem(instance))
return -ENOMEM;
goto fail;
break;
case VENTURA_SERIES:
case THUNDERBOLT_SERIES:
case INVADER_SERIES:
if (megasas_alloc_fusion_context(instance))
return -ENOMEM;
goto fail;
break;
}
return 0;
fail:
kfree(instance->reply_map);
instance->reply_map = NULL;
return -ENOMEM;
}
/*
@ -6148,6 +6179,7 @@ static int megasas_alloc_ctrl_mem(struct megasas_instance *instance)
*/
static inline void megasas_free_ctrl_mem(struct megasas_instance *instance)
{
kfree(instance->reply_map);
if (instance->adapter_type == MFI_SERIES) {
if (instance->producer)
pci_free_consistent(instance->pdev, sizeof(u32),
@ -6540,7 +6572,6 @@ fail_io_attach:
pci_free_irq_vectors(instance->pdev);
fail_init_mfi:
scsi_host_put(host);
fail_alloc_instance:
pci_disable_device(pdev);
@ -6746,6 +6777,8 @@ megasas_resume(struct pci_dev *pdev)
if (rval < 0)
goto fail_reenable_msix;
megasas_setup_reply_map(instance);
if (instance->adapter_type != MFI_SERIES) {
megasas_reset_reply_desc(instance);
if (megasas_ioc_init_fusion(instance)) {

12
drivers/scsi/megaraid/megaraid_sas_fusion.c
View File

@ -2641,11 +2641,8 @@ megasas_build_ldio_fusion(struct megasas_instance *instance,
fp_possible = (io_info.fpOkForIo > 0) ? true : false;
}
/* Use raw_smp_processor_id() for now until cmd->request->cpu is CPU
id by default, not CPU group id, otherwise all MSI-X queues won't
be utilized */
cmd->request_desc->SCSIIO.MSIxIndex = instance->msix_vectors ?
raw_smp_processor_id() % instance->msix_vectors : 0;
cmd->request_desc->SCSIIO.MSIxIndex =
instance->reply_map[raw_smp_processor_id()];
praid_context = &io_request->RaidContext;
@ -2971,10 +2968,9 @@ megasas_build_syspd_fusion(struct megasas_instance *instance,
}
cmd->request_desc->SCSIIO.DevHandle = io_request->DevHandle;
cmd->request_desc->SCSIIO.MSIxIndex =
instance->msix_vectors ?
(raw_smp_processor_id() % instance->msix_vectors) : 0;
cmd->request_desc->SCSIIO.MSIxIndex =
instance->reply_map[raw_smp_processor_id()];
if (!fp_possible) {
/* system pd firmware path */