[Bionic][PATCH v3 18/21] scsi: megaraid_sas: fix selection of reply queue
Jose Ricardo Ziviani
joserz at linux.vnet.ibm.com
Tue May 15 13:03:21 UTC 2018
From: Ming Lei <ming.lei at redhat.com>
BugLink: http://bugs.launchpad.net/bugs/1759723
Since commit 84676c1f21e8 ("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 at suse.de>
Cc: "Martin K. Petersen" <martin.petersen at oracle.com>,
Cc: James Bottomley <james.bottomley at hansenpartnership.com>,
Cc: Christoph Hellwig <hch at lst.de>,
Cc: Don Brace <don.brace at microsemi.com>
Cc: Kashyap Desai <kashyap.desai at broadcom.com>
Cc: Laurence Oberman <loberman at redhat.com>
Cc: Mike Snitzer <snitzer at redhat.com>
Cc: Meelis Roos <mroos at linux.ee>
Cc: Artem Bityutskiy <artem.bityutskiy at intel.com>
Fixes: 84676c1f21e8 ("genirq/affinity: assign vectors to all possible CPUs")
Signed-off-by: Ming Lei <ming.lei at redhat.com>
Acked-by: Kashyap Desai <kashyap.desai at broadcom.com>
Tested-by: Kashyap Desai <kashyap.desai at broadcom.com>
Reviewed-by: Christoph Hellwig <hch at lst.de>
Tested-by: Artem Bityutskiy <artem.bityutskiy at intel.com>
Signed-off-by: Martin K. Petersen <martin.petersen at oracle.com>
(cherry picked from commit adbe552349f2d1e48357a00e564d26135e586634)
Signed-off-by: Jose Ricardo Ziviani <joserz at linux.ibm.com>
---
drivers/scsi/megaraid/megaraid_sas.h | 1 +
drivers/scsi/megaraid/megaraid_sas_base.c | 39 +++++++++++++++++++--
drivers/scsi/megaraid/megaraid_sas_fusion.c | 12 +++----
3 files changed, 41 insertions(+), 11 deletions(-)
diff --git a/drivers/scsi/megaraid/megaraid_sas.h b/drivers/scsi/megaraid/megaraid_sas.h
index f5a36ccb8606..394a8c6b8064 100644
--- a/drivers/scsi/megaraid/megaraid_sas.h
+++ b/drivers/scsi/megaraid/megaraid_sas.h
@@ -2107,6 +2107,7 @@ enum MR_PD_TYPE {
struct megasas_instance {
+ unsigned int *reply_map;
__le32 *producer;
dma_addr_t producer_h;
__le32 *consumer;
diff --git a/drivers/scsi/megaraid/megaraid_sas_base.c b/drivers/scsi/megaraid/megaraid_sas_base.c
index d4129469a73c..de75c88a2d16 100644
--- a/drivers/scsi/megaraid/megaraid_sas_base.c
+++ b/drivers/scsi/megaraid/megaraid_sas_base.c
@@ -5140,6 +5140,26 @@ megasas_setup_jbod_map(struct megasas_instance *instance)
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
@@ -5318,6 +5338,8 @@ 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,
@@ -6094,20 +6116,29 @@ 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;
}
/*
@@ -6119,6 +6150,7 @@ 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),
@@ -6512,7 +6544,6 @@ static int megasas_probe_one(struct pci_dev *pdev,
pci_free_irq_vectors(instance->pdev);
fail_init_mfi:
scsi_host_put(host);
-
fail_alloc_instance:
pci_disable_device(pdev);
@@ -6717,6 +6748,8 @@ 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)) {
diff --git a/drivers/scsi/megaraid/megaraid_sas_fusion.c b/drivers/scsi/megaraid/megaraid_sas_fusion.c
index be2992509b8c..7ef81d6290b4 100644
--- a/drivers/scsi/megaraid/megaraid_sas_fusion.c
+++ b/drivers/scsi/megaraid/megaraid_sas_fusion.c
@@ -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;
@@ -2967,10 +2964,9 @@ 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 */
--
2.17.0
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