| Message ID | 20201203034100.29716-3-kashyap.desai@broadcom.com (mailing list archive) |
|---|---|
| State | Changes Requested |
| Headers | show |
| Series | io_uring iopoll in scsi layer | expand |
On 12/3/20 4:40 AM, Kashyap Desai wrote: > Add support of iouring iopoll interface. This feature requires shared > hosttag support in kernel and driver. > > Driver will work in non-IRQ mode = There will not be any msix vector > associated for poll_queues and h/w can still work in this mode. > MegaRaid h/w is single submission queue and multiple reply queue, but > using shared host tagset support it will enable simulated multiple hw queue. > > Driver allocates some extra reply queues and it will be marked as poll_queue. > These poll_queues will not have associated msix vectors. All the IO > completion on this queue will be done from IOPOLL interface. > > megaraid_sas driver having 8 poll_queues and using io_uring hiprio=1 settings, > It can reach 3.2M IOPs and there is zero interrupt generated by h/w. > > This feature can be enabled using module parameter poll_queues. > > Signed-off-by: Kashyap Desai <kashyap.desai@broadcom.com> > Cc: sumit.saxena@broadcom.com > Cc: chandrakanth.patil@broadcom.com > Cc: linux-block@vger.kernel.org > --- > drivers/scsi/megaraid/megaraid_sas.h | 2 + > drivers/scsi/megaraid/megaraid_sas_base.c | 90 ++++++++++++++++++--- > drivers/scsi/megaraid/megaraid_sas_fusion.c | 43 +++++++++- > drivers/scsi/megaraid/megaraid_sas_fusion.h | 3 + > 4 files changed, 127 insertions(+), 11 deletions(-) > > diff --git a/drivers/scsi/megaraid/megaraid_sas.h b/drivers/scsi/megaraid/megaraid_sas.h > index 0f808d63580e..0d58b123f0d0 100644 > --- a/drivers/scsi/megaraid/megaraid_sas.h > +++ b/drivers/scsi/megaraid/megaraid_sas.h > @@ -2212,6 +2212,7 @@ struct megasas_irq_context { > struct irq_poll irqpoll; > bool irq_poll_scheduled; > bool irq_line_enable; > + atomic_t in_used; > }; > > struct MR_DRV_SYSTEM_INFO { > @@ -2446,6 +2447,7 @@ struct megasas_instance { > bool support_pci_lane_margining; > u8 low_latency_index_start; > int perf_mode; > + int iopoll_q_count; > }; > > struct MR_LD_VF_MAP { > diff --git a/drivers/scsi/megaraid/megaraid_sas_base.c b/drivers/scsi/megaraid/megaraid_sas_base.c > index af192096a82b..c9987411d215 100644 > --- a/drivers/scsi/megaraid/megaraid_sas_base.c > +++ b/drivers/scsi/megaraid/megaraid_sas_base.c > @@ -114,6 +114,15 @@ unsigned int enable_sdev_max_qd; > module_param(enable_sdev_max_qd, int, 0444); > MODULE_PARM_DESC(enable_sdev_max_qd, "Enable sdev max qd as can_queue. Default: 0"); > > +int poll_queues; > +module_param(poll_queues, int, 0444); > +MODULE_PARM_DESC(poll_queues, "Number of queues to be use for io_uring poll mode.\n\t\t" > + "This parameter is effective only if host_tagset_enable=1 &\n\t\t" > + "It is not applicable for MFI_SERIES. &\n\t\t" > + "Driver will work in latency mode. &\n\t\t" > + "High iops queues are not allocated &\n\t\t" > + ); > + > int host_tagset_enable = 1; > module_param(host_tagset_enable, int, 0444); > MODULE_PARM_DESC(host_tagset_enable, "Shared host tagset enable/disable Default: enable(1)"); > @@ -207,6 +216,7 @@ static bool support_pci_lane_margining; > static spinlock_t poll_aen_lock; > > extern struct dentry *megasas_debugfs_root; > +extern int megasas_blk_mq_poll(struct Scsi_Host *shost, unsigned int queue_num); > > void > megasas_complete_cmd(struct megasas_instance *instance, struct megasas_cmd *cmd, > @@ -3127,14 +3137,45 @@ megasas_bios_param(struct scsi_device *sdev, struct block_device *bdev, > static int megasas_map_queues(struct Scsi_Host *shost) > { > struct megasas_instance *instance; > + int i, qoff, offset; > > instance = (struct megasas_instance *)shost->hostdata; > > if (shost->nr_hw_queues == 1) > return 0; > > - return blk_mq_pci_map_queues(&shost->tag_set.map[HCTX_TYPE_DEFAULT], > - instance->pdev, instance->low_latency_index_start); > + offset = instance->low_latency_index_start; > + > + for (i = 0, qoff = 0; i < HCTX_MAX_TYPES; i++) { > + struct blk_mq_queue_map *map = &shost->tag_set.map[i]; > + > + map->nr_queues = 0; > + > + if (i == HCTX_TYPE_DEFAULT) > + map->nr_queues = instance->msix_vectors - offset; > + else if (i == HCTX_TYPE_POLL) > + map->nr_queues = instance->iopoll_q_count; > + > + if (!map->nr_queues) { > + BUG_ON(i == HCTX_TYPE_DEFAULT); > + continue; > + } > + > + /* > + * The poll queue(s) doesn't have an IRQ (and hence IRQ > + * affinity), so use the regular blk-mq cpu mapping > + */ > + map->queue_offset = qoff; > + if (i != HCTX_TYPE_POLL) > + blk_mq_pci_map_queues(map, instance->pdev, offset); > + else > + blk_mq_map_queues(map); > + > + qoff += map->nr_queues; > + offset += map->nr_queues; > + } > + Seeing that you only ever use HCTX_TYPE_DEFAULT and HCTX_TYPE_POLL that loop is a bit non-obvious; maybe it's better to unroll it and assigne the values manually. > + return 0; > } > > static void megasas_aen_polling(struct work_struct *work); > @@ -3446,6 +3487,7 @@ static struct scsi_host_template megasas_template = { > .shost_attrs = megaraid_host_attrs, > .bios_param = megasas_bios_param, > .map_queues = megasas_map_queues, > + .mq_poll = megasas_blk_mq_poll, > .change_queue_depth = scsi_change_queue_depth, > .max_segment_size = 0xffffffff, > }; > @@ -5834,13 +5876,16 @@ __megasas_alloc_irq_vectors(struct megasas_instance *instance) > irq_flags = PCI_IRQ_MSIX; > > if (instance->smp_affinity_enable) > - irq_flags |= PCI_IRQ_AFFINITY; > + irq_flags |= PCI_IRQ_AFFINITY | PCI_IRQ_ALL_TYPES; > else > descp = NULL; > > + /* Do not allocate msix vectors for poll_queues. > + * msix_vectors is always within a range of FW supported reply queue. > + */ > i = pci_alloc_irq_vectors_affinity(instance->pdev, > instance->low_latency_index_start, > - instance->msix_vectors, irq_flags, descp); > + instance->msix_vectors - instance->iopoll_q_count, irq_flags, descp); > > return i; > } > @@ -5856,10 +5901,25 @@ megasas_alloc_irq_vectors(struct megasas_instance *instance) > int i; > unsigned int num_msix_req; > > + instance->iopoll_q_count = 0; > + if ((instance->adapter_type != MFI_SERIES) && > + poll_queues) { > + > + instance->perf_mode = MR_LATENCY_PERF_MODE; > + instance->low_latency_index_start = 1; > + > + /* reserve for default and non-mananged pre-vector. */ > + if (instance->msix_vectors > (instance->iopoll_q_count + 2)) > + instance->iopoll_q_count = poll_queues; > + else > + instance->iopoll_q_count = 0; > + } > + > i = __megasas_alloc_irq_vectors(instance); > > - if ((instance->perf_mode == MR_BALANCED_PERF_MODE) && > - (i != instance->msix_vectors)) { > + if (((instance->perf_mode == MR_BALANCED_PERF_MODE) > + || instance->iopoll_q_count) && > + (i != (instance->msix_vectors - instance->iopoll_q_count))) { > if (instance->msix_vectors) > pci_free_irq_vectors(instance->pdev); > /* Disable Balanced IOPS mode and try realloc vectors */ > @@ -5870,12 +5930,15 @@ megasas_alloc_irq_vectors(struct megasas_instance *instance) > instance->msix_vectors = min(num_msix_req, > instance->msix_vectors); > > + instance->iopoll_q_count = 0; > i = __megasas_alloc_irq_vectors(instance); > > } > > dev_info(&instance->pdev->dev, > - "requested/available msix %d/%d\n", instance->msix_vectors, i); > + "requested/available msix %d/%d poll_queue %d\n", > + instance->msix_vectors - instance->iopoll_q_count, > + i, instance->iopoll_q_count); > > if (i > 0) > instance->msix_vectors = i; > @@ -6841,12 +6904,18 @@ static int megasas_io_attach(struct megasas_instance *instance) > instance->smp_affinity_enable) { > host->host_tagset = 1; > host->nr_hw_queues = instance->msix_vectors - > - instance->low_latency_index_start; > + instance->low_latency_index_start + instance->iopoll_q_count; > + if (instance->iopoll_q_count) > + host->nr_maps = 3; > + } else { > + instance->iopoll_q_count = 0; > } > > dev_info(&instance->pdev->dev, > - "Max firmware commands: %d shared with nr_hw_queues = %d\n", > - instance->max_fw_cmds, host->nr_hw_queues); > + "Max firmware commands: %d shared with default " > + "hw_queues = %d poll_queues %d\n", instance->max_fw_cmds, > + host->nr_hw_queues - instance->iopoll_q_count, > + instance->iopoll_q_count); > /* > * Notify the mid-layer about the new controller > */ > @@ -8861,6 +8930,7 @@ static int __init megasas_init(void) > msix_vectors = 1; > rdpq_enable = 0; > dual_qdepth_disable = 1; > + poll_queues = 0; > } > > /* > diff --git a/drivers/scsi/megaraid/megaraid_sas_fusion.c b/drivers/scsi/megaraid/megaraid_sas_fusion.c > index fd607287608e..49c8cc3507e0 100644 > --- a/drivers/scsi/megaraid/megaraid_sas_fusion.c > +++ b/drivers/scsi/megaraid/megaraid_sas_fusion.c > @@ -685,6 +685,8 @@ megasas_alloc_reply_fusion(struct megasas_instance *instance) > fusion = instance->ctrl_context; > > count = instance->msix_vectors > 0 ? instance->msix_vectors : 1; > + count += instance->iopoll_q_count; > + > fusion->reply_frames_desc_pool = > dma_pool_create("mr_reply", &instance->pdev->dev, > fusion->reply_alloc_sz * count, 16, 0); > @@ -779,6 +781,7 @@ megasas_alloc_rdpq_fusion(struct megasas_instance *instance) > } > > msix_count = instance->msix_vectors > 0 ? instance->msix_vectors : 1; > + msix_count += instance->iopoll_q_count; > > fusion->reply_frames_desc_pool = dma_pool_create("mr_rdpq", > &instance->pdev->dev, > @@ -1129,7 +1132,7 @@ megasas_ioc_init_fusion(struct megasas_instance *instance) > MPI2_IOCINIT_MSGFLAG_RDPQ_ARRAY_MODE : 0; > IOCInitMessage->SystemRequestFrameBaseAddress = cpu_to_le64(fusion->io_request_frames_phys); > IOCInitMessage->SenseBufferAddressHigh = cpu_to_le32(upper_32_bits(fusion->sense_phys_addr)); > - IOCInitMessage->HostMSIxVectors = instance->msix_vectors; > + IOCInitMessage->HostMSIxVectors = instance->msix_vectors + instance->iopoll_q_count; > IOCInitMessage->HostPageSize = MR_DEFAULT_NVME_PAGE_SHIFT; > > time = ktime_get_real(); > @@ -1823,6 +1826,8 @@ megasas_init_adapter_fusion(struct megasas_instance *instance) > sizeof(union MPI2_SGE_IO_UNION))/16; > > count = instance->msix_vectors > 0 ? instance->msix_vectors : 1; > + count += instance->iopoll_q_count; > + > for (i = 0 ; i < count; i++) > fusion->last_reply_idx[i] = 0; > > @@ -1835,6 +1840,9 @@ megasas_init_adapter_fusion(struct megasas_instance *instance) > MEGASAS_FUSION_IOCTL_CMDS); > sema_init(&instance->ioctl_sem, MEGASAS_FUSION_IOCTL_CMDS); > > + for (i = 0; i < MAX_MSIX_QUEUES_FUSION; i++) > + atomic_set(&fusion->busy_mq_poll[i], 0); > + > if (megasas_alloc_ioc_init_frame(instance)) > return 1; > > @@ -3500,6 +3508,9 @@ complete_cmd_fusion(struct megasas_instance *instance, u32 MSIxIndex, > if (reply_descript_type == MPI2_RPY_DESCRIPT_FLAGS_UNUSED) > return IRQ_NONE; > > + if (irq_context && !atomic_add_unless(&irq_context->in_used, 1, 1)) > + return 0; > + > num_completed = 0; > > while (d_val.u.low != cpu_to_le32(UINT_MAX) && > @@ -3613,6 +3624,7 @@ complete_cmd_fusion(struct megasas_instance *instance, u32 MSIxIndex, > irq_context->irq_line_enable = true; > irq_poll_sched(&irq_context->irqpoll); > } > + atomic_dec(&irq_context->in_used); > return num_completed; > } > } > @@ -3630,9 +3642,36 @@ complete_cmd_fusion(struct megasas_instance *instance, u32 MSIxIndex, > instance->reply_post_host_index_addr[0]); > megasas_check_and_restore_queue_depth(instance); > } > + > + if (irq_context) > + atomic_dec(&irq_context->in_used); > + > return num_completed; > } > > +int megasas_blk_mq_poll(struct Scsi_Host *shost, unsigned int queue_num) > +{ > + > + struct megasas_instance *instance; > + int num_entries = 0; > + struct fusion_context *fusion; > + > + instance = (struct megasas_instance *)shost->hostdata; > + > + fusion = instance->ctrl_context; > + > + queue_num = queue_num + instance->low_latency_index_start; > + > + if (!atomic_add_unless(&fusion->busy_mq_poll[queue_num], 1, 1)) > + return 0; > + > + num_entries = complete_cmd_fusion(instance, queue_num, NULL); > + atomic_dec(&fusion->busy_mq_poll[queue_num]); > + > + return num_entries; > +} > + > + > /** > * megasas_enable_irq_poll() - enable irqpoll > * @instance: Adapter soft state Double newline > @@ -4164,6 +4203,8 @@ void megasas_reset_reply_desc(struct megasas_instance *instance) > > fusion = instance->ctrl_context; > count = instance->msix_vectors > 0 ? instance->msix_vectors : 1; > + count += instance->iopoll_q_count; > + > for (i = 0 ; i < count ; i++) { > fusion->last_reply_idx[i] = 0; > reply_desc = fusion->reply_frames_desc[i]; > diff --git a/drivers/scsi/megaraid/megaraid_sas_fusion.h b/drivers/scsi/megaraid/megaraid_sas_fusion.h > index 30de4b01f703..242ff58a3404 100644 > --- a/drivers/scsi/megaraid/megaraid_sas_fusion.h > +++ b/drivers/scsi/megaraid/megaraid_sas_fusion.h > @@ -1303,6 +1303,9 @@ struct fusion_context { > u8 *sense; > dma_addr_t sense_phys_addr; > > + atomic_t busy_mq_poll[MAX_MSIX_QUEUES_FUSION]; > + > + > dma_addr_t reply_frames_desc_phys[MAX_MSIX_QUEUES_FUSION]; > union MPI2_REPLY_DESCRIPTORS_UNION *reply_frames_desc[MAX_MSIX_QUEUES_FUSION]; > struct rdpq_alloc_detail rdpq_tracker[RDPQ_MAX_CHUNK_COUNT]; > Same here. Cheers, Hannes
Hi Kashyap,
I love your patch! Perhaps something to improve:
[auto build test WARNING on 0eedceafd3a63fd082743c914853ef4b9247dbe6]
url: https://github.com/0day-ci/linux/commits/Kashyap-Desai/io_uring-iopoll-in-scsi-layer/20201203-194918
base: 0eedceafd3a63fd082743c914853ef4b9247dbe6
config: i386-randconfig-s001-20201203 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-15) 9.3.0
reproduce:
# apt-get install sparse
# sparse version: v0.6.3-179-ga00755aa-dirty
# https://github.com/0day-ci/linux/commit/f2b4b005fc618696e1b343f91cf9907427e0df91
git remote add linux-review https://github.com/0day-ci/linux
git fetch --no-tags linux-review Kashyap-Desai/io_uring-iopoll-in-scsi-layer/20201203-194918
git checkout f2b4b005fc618696e1b343f91cf9907427e0df91
# save the attached .config to linux build tree
make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=i386
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>
All warnings (new ones prefixed by >>):
>> drivers/scsi/megaraid/megaraid_sas_fusion.c:3652:5: warning: no previous prototype for 'megasas_blk_mq_poll' [-Wmissing-prototypes]
3652 | int megasas_blk_mq_poll(struct Scsi_Host *shost, unsigned int queue_num)
| ^~~~~~~~~~~~~~~~~~~
vim +/megasas_blk_mq_poll +3652 drivers/scsi/megaraid/megaraid_sas_fusion.c
3651
> 3652 int megasas_blk_mq_poll(struct Scsi_Host *shost, unsigned int queue_num)
3653 {
3654
3655 struct megasas_instance *instance;
3656 int num_entries = 0;
3657 struct fusion_context *fusion;
3658
3659 instance = (struct megasas_instance *)shost->hostdata;
3660
3661 fusion = instance->ctrl_context;
3662
3663 queue_num = queue_num + instance->low_latency_index_start;
3664
3665 if (!atomic_add_unless(&fusion->busy_mq_poll[queue_num], 1, 1))
3666 return 0;
3667
3668 num_entries = complete_cmd_fusion(instance, queue_num, NULL);
3669 atomic_dec(&fusion->busy_mq_poll[queue_num]);
3670
3671 return num_entries;
3672 }
3673
---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
> > static int megasas_map_queues(struct Scsi_Host *shost) > > { > > struct megasas_instance *instance; > > + int i, qoff, offset; > > > > instance = (struct megasas_instance *)shost->hostdata; > > > > if (shost->nr_hw_queues == 1) > > return 0; > > > > - return blk_mq_pci_map_queues(&shost- > >tag_set.map[HCTX_TYPE_DEFAULT], > > - instance->pdev, instance->low_latency_index_start); > > + offset = instance->low_latency_index_start; > > + > > + for (i = 0, qoff = 0; i < HCTX_MAX_TYPES; i++) { > > + struct blk_mq_queue_map *map = &shost->tag_set.map[i]; > > + > > + map->nr_queues = 0; > > + > > + if (i == HCTX_TYPE_DEFAULT) > > + map->nr_queues = instance->msix_vectors - offset; > > + else if (i == HCTX_TYPE_POLL) > > + map->nr_queues = instance->iopoll_q_count; > > + > > + if (!map->nr_queues) { > > + BUG_ON(i == HCTX_TYPE_DEFAULT); > > + continue; > > + } > > + > > + /* > > + * The poll queue(s) doesn't have an IRQ (and hence IRQ > > + * affinity), so use the regular blk-mq cpu mapping > > + */ > > + map->queue_offset = qoff; > > + if (i != HCTX_TYPE_POLL) > > + blk_mq_pci_map_queues(map, instance->pdev, > offset); > > + else > > + blk_mq_map_queues(map); > > + > > + qoff += map->nr_queues; > > + offset += map->nr_queues; > > + } > > + > Seeing that you only ever use HCTX_TYPE_DEFAULT and HCTX_TYPE_POLL > that loop is a bit non-obvious; maybe it's better to unroll it and assigne > the > values manually. Hannes- I have taken care this in V3 series. Please review. > > /** > > * megasas_enable_irq_poll() - enable irqpoll > > * @instance: Adapter soft state > > Double newline Taken care in V3. > > > @@ -4164,6 +4203,8 @@ void megasas_reset_reply_desc(struct > > megasas_instance *instance) > > > > fusion = instance->ctrl_context; > > count = instance->msix_vectors > 0 ? instance->msix_vectors : 1; > > + count += instance->iopoll_q_count; > > + > > for (i = 0 ; i < count ; i++) { > > fusion->last_reply_idx[i] = 0; > > reply_desc = fusion->reply_frames_desc[i]; diff --git > > a/drivers/scsi/megaraid/megaraid_sas_fusion.h > > b/drivers/scsi/megaraid/megaraid_sas_fusion.h > > index 30de4b01f703..242ff58a3404 100644 > > --- a/drivers/scsi/megaraid/megaraid_sas_fusion.h > > +++ b/drivers/scsi/megaraid/megaraid_sas_fusion.h > > @@ -1303,6 +1303,9 @@ struct fusion_context { > > u8 *sense; > > dma_addr_t sense_phys_addr; > > > > + atomic_t busy_mq_poll[MAX_MSIX_QUEUES_FUSION]; > > + > > + > > dma_addr_t reply_frames_desc_phys[MAX_MSIX_QUEUES_FUSION]; > > union MPI2_REPLY_DESCRIPTORS_UNION > *reply_frames_desc[MAX_MSIX_QUEUES_FUSION]; > > struct rdpq_alloc_detail rdpq_tracker[RDPQ_MAX_CHUNK_COUNT]; > > > Same here. Taken care in V3. > > Cheers, > > Hannes > -- > Dr. Hannes Reinecke Kernel Storage Architect > hare@suse.de +49 911 74053 688 > SUSE Software Solutions GmbH, Maxfeldstr. 5, 90409 Nürnberg HRB 36809 > (AG Nürnberg), Geschäftsführer: Felix Imendörffer
diff --git a/drivers/scsi/megaraid/megaraid_sas.h b/drivers/scsi/megaraid/megaraid_sas.h index 0f808d63580e..0d58b123f0d0 100644 --- a/drivers/scsi/megaraid/megaraid_sas.h +++ b/drivers/scsi/megaraid/megaraid_sas.h @@ -2212,6 +2212,7 @@ struct megasas_irq_context { struct irq_poll irqpoll; bool irq_poll_scheduled; bool irq_line_enable; + atomic_t in_used; }; struct MR_DRV_SYSTEM_INFO { @@ -2446,6 +2447,7 @@ struct megasas_instance { bool support_pci_lane_margining; u8 low_latency_index_start; int perf_mode; + int iopoll_q_count; }; struct MR_LD_VF_MAP { diff --git a/drivers/scsi/megaraid/megaraid_sas_base.c b/drivers/scsi/megaraid/megaraid_sas_base.c index af192096a82b..c9987411d215 100644 --- a/drivers/scsi/megaraid/megaraid_sas_base.c +++ b/drivers/scsi/megaraid/megaraid_sas_base.c @@ -114,6 +114,15 @@ unsigned int enable_sdev_max_qd; module_param(enable_sdev_max_qd, int, 0444); MODULE_PARM_DESC(enable_sdev_max_qd, "Enable sdev max qd as can_queue. Default: 0"); +int poll_queues; +module_param(poll_queues, int, 0444); +MODULE_PARM_DESC(poll_queues, "Number of queues to be use for io_uring poll mode.\n\t\t" + "This parameter is effective only if host_tagset_enable=1 &\n\t\t" + "It is not applicable for MFI_SERIES. &\n\t\t" + "Driver will work in latency mode. &\n\t\t" + "High iops queues are not allocated &\n\t\t" + ); + int host_tagset_enable = 1; module_param(host_tagset_enable, int, 0444); MODULE_PARM_DESC(host_tagset_enable, "Shared host tagset enable/disable Default: enable(1)"); @@ -207,6 +216,7 @@ static bool support_pci_lane_margining; static spinlock_t poll_aen_lock; extern struct dentry *megasas_debugfs_root; +extern int megasas_blk_mq_poll(struct Scsi_Host *shost, unsigned int queue_num); void megasas_complete_cmd(struct megasas_instance *instance, struct megasas_cmd *cmd, @@ -3127,14 +3137,45 @@ megasas_bios_param(struct scsi_device *sdev, struct block_device *bdev, static int megasas_map_queues(struct Scsi_Host *shost) { struct megasas_instance *instance; + int i, qoff, offset; instance = (struct megasas_instance *)shost->hostdata; if (shost->nr_hw_queues == 1) return 0; - return blk_mq_pci_map_queues(&shost->tag_set.map[HCTX_TYPE_DEFAULT], - instance->pdev, instance->low_latency_index_start); + offset = instance->low_latency_index_start; + + for (i = 0, qoff = 0; i < HCTX_MAX_TYPES; i++) { + struct blk_mq_queue_map *map = &shost->tag_set.map[i]; + + map->nr_queues = 0; + + if (i == HCTX_TYPE_DEFAULT) + map->nr_queues = instance->msix_vectors - offset; + else if (i == HCTX_TYPE_POLL) + map->nr_queues = instance->iopoll_q_count; + + if (!map->nr_queues) { + BUG_ON(i == HCTX_TYPE_DEFAULT); + continue; + } + + /* + * The poll queue(s) doesn't have an IRQ (and hence IRQ + * affinity), so use the regular blk-mq cpu mapping + */ + map->queue_offset = qoff; + if (i != HCTX_TYPE_POLL) + blk_mq_pci_map_queues(map, instance->pdev, offset); + else + blk_mq_map_queues(map); + + qoff += map->nr_queues; + offset += map->nr_queues; + } + + return 0; } static void megasas_aen_polling(struct work_struct *work); @@ -3446,6 +3487,7 @@ static struct scsi_host_template megasas_template = { .shost_attrs = megaraid_host_attrs, .bios_param = megasas_bios_param, .map_queues = megasas_map_queues, + .mq_poll = megasas_blk_mq_poll, .change_queue_depth = scsi_change_queue_depth, .max_segment_size = 0xffffffff, }; @@ -5834,13 +5876,16 @@ __megasas_alloc_irq_vectors(struct megasas_instance *instance) irq_flags = PCI_IRQ_MSIX; if (instance->smp_affinity_enable) - irq_flags |= PCI_IRQ_AFFINITY; + irq_flags |= PCI_IRQ_AFFINITY | PCI_IRQ_ALL_TYPES; else descp = NULL; + /* Do not allocate msix vectors for poll_queues. + * msix_vectors is always within a range of FW supported reply queue. + */ i = pci_alloc_irq_vectors_affinity(instance->pdev, instance->low_latency_index_start, - instance->msix_vectors, irq_flags, descp); + instance->msix_vectors - instance->iopoll_q_count, irq_flags, descp); return i; } @@ -5856,10 +5901,25 @@ megasas_alloc_irq_vectors(struct megasas_instance *instance) int i; unsigned int num_msix_req; + instance->iopoll_q_count = 0; + if ((instance->adapter_type != MFI_SERIES) && + poll_queues) { + + instance->perf_mode = MR_LATENCY_PERF_MODE; + instance->low_latency_index_start = 1; + + /* reserve for default and non-mananged pre-vector. */ + if (instance->msix_vectors > (instance->iopoll_q_count + 2)) + instance->iopoll_q_count = poll_queues; + else + instance->iopoll_q_count = 0; + } + i = __megasas_alloc_irq_vectors(instance); - if ((instance->perf_mode == MR_BALANCED_PERF_MODE) && - (i != instance->msix_vectors)) { + if (((instance->perf_mode == MR_BALANCED_PERF_MODE) + || instance->iopoll_q_count) && + (i != (instance->msix_vectors - instance->iopoll_q_count))) { if (instance->msix_vectors) pci_free_irq_vectors(instance->pdev); /* Disable Balanced IOPS mode and try realloc vectors */ @@ -5870,12 +5930,15 @@ megasas_alloc_irq_vectors(struct megasas_instance *instance) instance->msix_vectors = min(num_msix_req, instance->msix_vectors); + instance->iopoll_q_count = 0; i = __megasas_alloc_irq_vectors(instance); } dev_info(&instance->pdev->dev, - "requested/available msix %d/%d\n", instance->msix_vectors, i); + "requested/available msix %d/%d poll_queue %d\n", + instance->msix_vectors - instance->iopoll_q_count, + i, instance->iopoll_q_count); if (i > 0) instance->msix_vectors = i; @@ -6841,12 +6904,18 @@ static int megasas_io_attach(struct megasas_instance *instance) instance->smp_affinity_enable) { host->host_tagset = 1; host->nr_hw_queues = instance->msix_vectors - - instance->low_latency_index_start; + instance->low_latency_index_start + instance->iopoll_q_count; + if (instance->iopoll_q_count) + host->nr_maps = 3; + } else { + instance->iopoll_q_count = 0; } dev_info(&instance->pdev->dev, - "Max firmware commands: %d shared with nr_hw_queues = %d\n", - instance->max_fw_cmds, host->nr_hw_queues); + "Max firmware commands: %d shared with default " + "hw_queues = %d poll_queues %d\n", instance->max_fw_cmds, + host->nr_hw_queues - instance->iopoll_q_count, + instance->iopoll_q_count); /* * Notify the mid-layer about the new controller */ @@ -8861,6 +8930,7 @@ static int __init megasas_init(void) msix_vectors = 1; rdpq_enable = 0; dual_qdepth_disable = 1; + poll_queues = 0; } /* diff --git a/drivers/scsi/megaraid/megaraid_sas_fusion.c b/drivers/scsi/megaraid/megaraid_sas_fusion.c index fd607287608e..49c8cc3507e0 100644 --- a/drivers/scsi/megaraid/megaraid_sas_fusion.c +++ b/drivers/scsi/megaraid/megaraid_sas_fusion.c @@ -685,6 +685,8 @@ megasas_alloc_reply_fusion(struct megasas_instance *instance) fusion = instance->ctrl_context; count = instance->msix_vectors > 0 ? instance->msix_vectors : 1; + count += instance->iopoll_q_count; + fusion->reply_frames_desc_pool = dma_pool_create("mr_reply", &instance->pdev->dev, fusion->reply_alloc_sz * count, 16, 0); @@ -779,6 +781,7 @@ megasas_alloc_rdpq_fusion(struct megasas_instance *instance) } msix_count = instance->msix_vectors > 0 ? instance->msix_vectors : 1; + msix_count += instance->iopoll_q_count; fusion->reply_frames_desc_pool = dma_pool_create("mr_rdpq", &instance->pdev->dev, @@ -1129,7 +1132,7 @@ megasas_ioc_init_fusion(struct megasas_instance *instance) MPI2_IOCINIT_MSGFLAG_RDPQ_ARRAY_MODE : 0; IOCInitMessage->SystemRequestFrameBaseAddress = cpu_to_le64(fusion->io_request_frames_phys); IOCInitMessage->SenseBufferAddressHigh = cpu_to_le32(upper_32_bits(fusion->sense_phys_addr)); - IOCInitMessage->HostMSIxVectors = instance->msix_vectors; + IOCInitMessage->HostMSIxVectors = instance->msix_vectors + instance->iopoll_q_count; IOCInitMessage->HostPageSize = MR_DEFAULT_NVME_PAGE_SHIFT; time = ktime_get_real(); @@ -1823,6 +1826,8 @@ megasas_init_adapter_fusion(struct megasas_instance *instance) sizeof(union MPI2_SGE_IO_UNION))/16; count = instance->msix_vectors > 0 ? instance->msix_vectors : 1; + count += instance->iopoll_q_count; + for (i = 0 ; i < count; i++) fusion->last_reply_idx[i] = 0; @@ -1835,6 +1840,9 @@ megasas_init_adapter_fusion(struct megasas_instance *instance) MEGASAS_FUSION_IOCTL_CMDS); sema_init(&instance->ioctl_sem, MEGASAS_FUSION_IOCTL_CMDS); + for (i = 0; i < MAX_MSIX_QUEUES_FUSION; i++) + atomic_set(&fusion->busy_mq_poll[i], 0); + if (megasas_alloc_ioc_init_frame(instance)) return 1; @@ -3500,6 +3508,9 @@ complete_cmd_fusion(struct megasas_instance *instance, u32 MSIxIndex, if (reply_descript_type == MPI2_RPY_DESCRIPT_FLAGS_UNUSED) return IRQ_NONE; + if (irq_context && !atomic_add_unless(&irq_context->in_used, 1, 1)) + return 0; + num_completed = 0; while (d_val.u.low != cpu_to_le32(UINT_MAX) && @@ -3613,6 +3624,7 @@ complete_cmd_fusion(struct megasas_instance *instance, u32 MSIxIndex, irq_context->irq_line_enable = true; irq_poll_sched(&irq_context->irqpoll); } + atomic_dec(&irq_context->in_used); return num_completed; } } @@ -3630,9 +3642,36 @@ complete_cmd_fusion(struct megasas_instance *instance, u32 MSIxIndex, instance->reply_post_host_index_addr[0]); megasas_check_and_restore_queue_depth(instance); } + + if (irq_context) + atomic_dec(&irq_context->in_used); + return num_completed; } +int megasas_blk_mq_poll(struct Scsi_Host *shost, unsigned int queue_num) +{ + + struct megasas_instance *instance; + int num_entries = 0; + struct fusion_context *fusion; + + instance = (struct megasas_instance *)shost->hostdata; + + fusion = instance->ctrl_context; + + queue_num = queue_num + instance->low_latency_index_start; + + if (!atomic_add_unless(&fusion->busy_mq_poll[queue_num], 1, 1)) + return 0; + + num_entries = complete_cmd_fusion(instance, queue_num, NULL); + atomic_dec(&fusion->busy_mq_poll[queue_num]); + + return num_entries; +} + + /** * megasas_enable_irq_poll() - enable irqpoll * @instance: Adapter soft state @@ -4164,6 +4203,8 @@ void megasas_reset_reply_desc(struct megasas_instance *instance) fusion = instance->ctrl_context; count = instance->msix_vectors > 0 ? instance->msix_vectors : 1; + count += instance->iopoll_q_count; + for (i = 0 ; i < count ; i++) { fusion->last_reply_idx[i] = 0; reply_desc = fusion->reply_frames_desc[i]; diff --git a/drivers/scsi/megaraid/megaraid_sas_fusion.h b/drivers/scsi/megaraid/megaraid_sas_fusion.h index 30de4b01f703..242ff58a3404 100644 --- a/drivers/scsi/megaraid/megaraid_sas_fusion.h +++ b/drivers/scsi/megaraid/megaraid_sas_fusion.h @@ -1303,6 +1303,9 @@ struct fusion_context { u8 *sense; dma_addr_t sense_phys_addr; + atomic_t busy_mq_poll[MAX_MSIX_QUEUES_FUSION]; + + dma_addr_t reply_frames_desc_phys[MAX_MSIX_QUEUES_FUSION]; union MPI2_REPLY_DESCRIPTORS_UNION *reply_frames_desc[MAX_MSIX_QUEUES_FUSION]; struct rdpq_alloc_detail rdpq_tracker[RDPQ_MAX_CHUNK_COUNT];
Add support of iouring iopoll interface. This feature requires shared hosttag support in kernel and driver. Driver will work in non-IRQ mode = There will not be any msix vector associated for poll_queues and h/w can still work in this mode. MegaRaid h/w is single submission queue and multiple reply queue, but using shared host tagset support it will enable simulated multiple hw queue. Driver allocates some extra reply queues and it will be marked as poll_queue. These poll_queues will not have associated msix vectors. All the IO completion on this queue will be done from IOPOLL interface. megaraid_sas driver having 8 poll_queues and using io_uring hiprio=1 settings, It can reach 3.2M IOPs and there is zero interrupt generated by h/w. This feature can be enabled using module parameter poll_queues. Signed-off-by: Kashyap Desai <kashyap.desai@broadcom.com> Cc: sumit.saxena@broadcom.com Cc: chandrakanth.patil@broadcom.com Cc: linux-block@vger.kernel.org --- drivers/scsi/megaraid/megaraid_sas.h | 2 + drivers/scsi/megaraid/megaraid_sas_base.c | 90 ++++++++++++++++++--- drivers/scsi/megaraid/megaraid_sas_fusion.c | 43 +++++++++- drivers/scsi/megaraid/megaraid_sas_fusion.h | 3 + 4 files changed, 127 insertions(+), 11 deletions(-)