[PATCH AUTOSEL 6.1 10/15] scsi: aacraid: Reply queue mapping to CPUs based on IRQ affinity

Sasha Levin
2023-08-29T13:34:17Z

From: Sagar Biradar <sagar.biradar@microchip.com>

[ Upstream commit 9dc704dcc09eae7d21b5da0615eb2ed79278f63e ]

Fix the I/O hang that arises because of the MSIx vector not having a mapped
online CPU upon receiving completion.

SCSI cmds take the blk_mq route, which is setup during init. Reserved cmds
fetch the vector_no from mq_map after init is complete. Before init, they
have to use 0 - as per the norm.

Reviewed-by: Gilbert Wu <gilbert.wu@microchip.com>
Signed-off-by: Sagar Biradar <Sagar.Biradar@microchip.com>
Reviewed-by: John Garry <john.g.garry@oracle.com>
Link: https://lore.kernel.org/r/20230519230834.27436-1-sagar.biradar@microchip.com
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/scsi/aacraid/aacraid.h | 1 +
drivers/scsi/aacraid/commsup.c | 6 +++++-
drivers/scsi/aacraid/linit.c | 14 ++++++++++++++
drivers/scsi/aacraid/src.c | 25 +++++++++++++++++++++++--
4 files changed, 43 insertions(+), 3 deletions(-)

diff --git a/drivers/scsi/aacraid/aacraid.h b/drivers/scsi/aacraid/aacraid.h
index 5e115e8b2ba46..7c6efde75da66 100644
--- a/drivers/scsi/aacraid/aacraid.h
+++ b/drivers/scsi/aacraid/aacraid.h
@@ -1678,6 +1678,7 @@ struct aac_dev
u32 handle_pci_error;
bool init_reset;
u8 soft_reset_support;
+ u8 use_map_queue;
};

#define aac_adapter_interrupt(dev) \
diff --git a/drivers/scsi/aacraid/commsup.c b/drivers/scsi/aacraid/commsup.c
index deb32c9f4b3e6..3f062e4013ab6 100644
--- a/drivers/scsi/aacraid/commsup.c
+++ b/drivers/scsi/aacraid/commsup.c
@@ -223,8 +223,12 @@ int aac_fib_setup(struct aac_dev * dev)
struct fib *aac_fib_alloc_tag(struct aac_dev *dev, struct scsi_cmnd *scmd)
{
struct fib *fibptr;
+ u32 blk_tag;
+ int i;

- fibptr = &dev->fibs[scsi_cmd_to_rq(scmd)->tag];
+ blk_tag = blk_mq_unique_tag(scsi_cmd_to_rq(scmd));
+ i = blk_mq_unique_tag_to_tag(blk_tag);
+ fibptr = &dev->fibs[i];
/*
* Null out fields that depend on being zero at the start of
* each I/O
diff --git a/drivers/scsi/aacraid/linit.c b/drivers/scsi/aacraid/linit.c
index 5ba5c18b77b46..bff49b8ab057d 100644
--- a/drivers/scsi/aacraid/linit.c
+++ b/drivers/scsi/aacraid/linit.c
@@ -19,6 +19,7 @@

#include <linux/compat.h>
#include <linux/blkdev.h>
+#include <linux/blk-mq-pci.h>
#include <linux/completion.h>
#include <linux/init.h>
#include <linux/interrupt.h>
@@ -505,6 +506,15 @@ static int aac_slave_configure(struct scsi_device *sdev)
return 0;
}

+static void aac_map_queues(struct Scsi_Host *shost)
+{
+ struct aac_dev *aac = (struct aac_dev *)shost->hostdata;
+
+ blk_mq_pci_map_queues(&shost->tag_set.map[HCTX_TYPE_DEFAULT],
+ aac->pdev, 0);
+ aac->use_map_queue = true;
+}
+
/**
* aac_change_queue_depth - alter queue depths
* @sdev: SCSI device we are considering
@@ -1489,6 +1499,7 @@ static struct scsi_host_template aac_driver_template = {
.bios_param = aac_biosparm,
.shost_groups = aac_host_groups,
.slave_configure = aac_slave_configure,
+ .map_queues = aac_map_queues,
.change_queue_depth = aac_change_queue_depth,
.sdev_groups = aac_dev_groups,
.eh_abort_handler = aac_eh_abort,
@@ -1776,6 +1787,8 @@ static int aac_probe_one(struct pci_dev *pdev, const struct pci_device_id *id)
shost->max_lun = AAC_MAX_LUN;

pci_set_drvdata(pdev, shost);
+ shost->nr_hw_queues = aac->max_msix;
+ shost->host_tagset = 1;

error = scsi_add_host(shost, &pdev->dev);
if (error)
@@ -1908,6 +1921,7 @@ static void aac_remove_one(struct pci_dev *pdev)
struct aac_dev *aac = (struct aac_dev *)shost->hostdata;

aac_cancel_rescan_worker(aac);
+ aac->use_map_queue = false;
scsi_remove_host(shost);

__aac_shutdown(aac);
diff --git a/drivers/scsi/aacraid/src.c b/drivers/scsi/aacraid/src.c
index 11ef58204e96f..61949f3741886 100644
--- a/drivers/scsi/aacraid/src.c
+++ b/drivers/scsi/aacraid/src.c
@@ -493,6 +493,10 @@ static int aac_src_deliver_message(struct fib *fib)
#endif

u16 vector_no;
+ struct scsi_cmnd *scmd;
+ u32 blk_tag;
+ struct Scsi_Host *shost = dev->scsi_host_ptr;
+ struct blk_mq_queue_map *qmap;

atomic_inc(&q->numpending);

@@ -505,8 +509,25 @@ static int aac_src_deliver_message(struct fib *fib)
if ((dev->comm_interface == AAC_COMM_MESSAGE_TYPE3)
&& dev->sa_firmware)
vector_no = aac_get_vector(dev);
- else
- vector_no = fib->vector_no;
+ else {
+ if (!fib->vector_no || !fib->callback_data) {
+ if (shost && dev->use_map_queue) {
+ qmap = &shost->tag_set.map[HCTX_TYPE_DEFAULT];
+ vector_no = qmap->mq_map[raw_smp_processor_id()];
+ }
+ /*
+ * We hardcode the vector_no for
+ * reserved commands as a valid shost is
+ * absent during the init
+ */
+ else
+ vector_no = 0;
+ } else {
+ scmd = (struct scsi_cmnd *)fib->callback_data;
+ blk_tag = blk_mq_unique_tag(scsi_cmd_to_rq(scmd));
+ vector_no = blk_mq_unique_tag_to_hwq(blk_tag);
+ }
+ }

if (native_hba) {
if (fib->flags & FIB_CONTEXT_FLAG_NATIVE_HBA_TMF) {
--
2.40.1