On 29.08.23 15:32, Sasha Levin wrote:
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.
Sasha: you might want to consider dropping this from the 6.1 and 5.15 autosel queues for now, as this commit apparently causes a regression: https://bugzilla.kernel.org/show_bug.cgi?id=217599
Sagar Biradar: as this is a commit of yours; could you please look into the report? It was bisected a few weeks ago, but I suspect nobody told you. Ahh, the joys of bugzilla.
Ciao, Thorsten (wearing his 'the Linux kernel's regression tracker' hat) -- Everything you wanna know about Linux kernel regression tracking: https://linux-regtracking.leemhuis.info/about/#tldr If I did something stupid, please tell me, as explained on that page.
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);
elsevector_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*/elsevector_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) {