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author | Linus Torvalds <torvalds@linux-foundation.org> | 2020-12-09 02:00:36 +0300 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2020-12-09 02:00:36 +0300 |
commit | 1a0e1943d8798cb3241fb5edb9a836af1611b60a (patch) | |
tree | 619aab31af4624c9c4eb381b3fbe88c6387b3c62 /drivers/scsi/megaraid/megaraid_sas_fusion.c | |
parent | 7d8761ba27fcd9c761919beeaaceac06eed3ad74 (diff) | |
download | linux-1a0e1943d8798cb3241fb5edb9a836af1611b60a.tar.xz |
Revert "scsi: megaraid_sas: Added support for shared host tagset for cpuhotplug"
This reverts commit 103fbf8e4020845e4fcf63819288cedb092a3c91.
It turns out that it causes long boot-time latencies (to the point of
timeouts and failed boots).
The cause is the increase in request queues, and a fix for that is
queued up for 5.11, but we're reverting this commit that triggered the
problem for now.
Reported-and-tested-by: John Garry <john.garry@huawei.com>
Reported-and-tested-by: Julia Lawall <julia.lawall@inria.fr>
Reported-by: Qian Cai <cai@redhat.com>
Acked-by: Jens Axboe <axboe@kernel.dk>
Acked-by: Martin K. Petersen <martin.petersen@oracle.com>
Link: https://lore.kernel.org/linux-scsi/fe3dff7dae4494e5a88caffbb4d877bbf472dceb.camel@redhat.com/
Link: https://lore.kernel.org/lkml/alpine.DEB.2.22.394.2012081813310.2680@hadrien/
Link: https://lore.kernel.org/linux-block/20201203012638.543321-1-ming.lei@redhat.com/
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/scsi/megaraid/megaraid_sas_fusion.c')
-rw-r--r-- | drivers/scsi/megaraid/megaraid_sas_fusion.c | 29 |
1 files changed, 13 insertions, 16 deletions
diff --git a/drivers/scsi/megaraid/megaraid_sas_fusion.c b/drivers/scsi/megaraid/megaraid_sas_fusion.c index fd607287608e..b0c01cf0428f 100644 --- a/drivers/scsi/megaraid/megaraid_sas_fusion.c +++ b/drivers/scsi/megaraid/megaraid_sas_fusion.c @@ -359,29 +359,24 @@ megasas_get_msix_index(struct megasas_instance *instance, { int sdev_busy; - /* TBD - if sml remove device_busy in future, driver - * should track counter in internal structure. - */ - sdev_busy = atomic_read(&scmd->device->device_busy); + /* nr_hw_queue = 1 for MegaRAID */ + struct blk_mq_hw_ctx *hctx = + scmd->device->request_queue->queue_hw_ctx[0]; + + sdev_busy = atomic_read(&hctx->nr_active); if (instance->perf_mode == MR_BALANCED_PERF_MODE && - sdev_busy > (data_arms * MR_DEVICE_HIGH_IOPS_DEPTH)) { + sdev_busy > (data_arms * MR_DEVICE_HIGH_IOPS_DEPTH)) cmd->request_desc->SCSIIO.MSIxIndex = mega_mod64((atomic64_add_return(1, &instance->high_iops_outstanding) / MR_HIGH_IOPS_BATCH_COUNT), instance->low_latency_index_start); - } else if (instance->msix_load_balance) { + else if (instance->msix_load_balance) cmd->request_desc->SCSIIO.MSIxIndex = (mega_mod64(atomic64_add_return(1, &instance->total_io_count), instance->msix_vectors)); - } else if (instance->host->nr_hw_queues > 1) { - u32 tag = blk_mq_unique_tag(scmd->request); - - cmd->request_desc->SCSIIO.MSIxIndex = blk_mq_unique_tag_to_hwq(tag) + - instance->low_latency_index_start; - } else { + else cmd->request_desc->SCSIIO.MSIxIndex = instance->reply_map[raw_smp_processor_id()]; - } } /** @@ -961,6 +956,9 @@ megasas_alloc_cmds_fusion(struct megasas_instance *instance) if (megasas_alloc_cmdlist_fusion(instance)) goto fail_exit; + dev_info(&instance->pdev->dev, "Configured max firmware commands: %d\n", + instance->max_fw_cmds); + /* The first 256 bytes (SMID 0) is not used. Don't add to the cmd list */ io_req_base = fusion->io_request_frames + MEGA_MPI2_RAID_DEFAULT_IO_FRAME_SIZE; io_req_base_phys = fusion->io_request_frames_phys + MEGA_MPI2_RAID_DEFAULT_IO_FRAME_SIZE; @@ -1104,9 +1102,8 @@ megasas_ioc_init_fusion(struct megasas_instance *instance) MR_HIGH_IOPS_QUEUE_COUNT) && cur_intr_coalescing) instance->perf_mode = MR_BALANCED_PERF_MODE; - dev_info(&instance->pdev->dev, "Performance mode :%s (latency index = %d)\n", - MEGASAS_PERF_MODE_2STR(instance->perf_mode), - instance->low_latency_index_start); + dev_info(&instance->pdev->dev, "Performance mode :%s\n", + MEGASAS_PERF_MODE_2STR(instance->perf_mode)); instance->fw_sync_cache_support = (scratch_pad_1 & MR_CAN_HANDLE_SYNC_CACHE_OFFSET) ? 1 : 0; |