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Subject[PATCH RFC 5/5] scsi: hisi_sas: Switch v3 hw to MQ
Date
Now that the block layer provides a shared tag, we can switch the driver
to expose all HW queues.

Signed-off-by: John Garry <john.garry@huawei.com>
---
drivers/scsi/hisi_sas/hisi_sas.h | 3 +-
drivers/scsi/hisi_sas/hisi_sas_main.c | 43 +++++++------
drivers/scsi/hisi_sas/hisi_sas_v3_hw.c | 85 +++++++++++---------------
3 files changed, 59 insertions(+), 72 deletions(-)

diff --git a/drivers/scsi/hisi_sas/hisi_sas.h b/drivers/scsi/hisi_sas/hisi_sas.h
index 233c73e01246..0405602df2a4 100644
--- a/drivers/scsi/hisi_sas/hisi_sas.h
+++ b/drivers/scsi/hisi_sas/hisi_sas.h
@@ -8,6 +8,8 @@
#define _HISI_SAS_H_

#include <linux/acpi.h>
+#include <linux/blk-mq.h>
+#include <linux/blk-mq-pci.h>
#include <linux/clk.h>
#include <linux/debugfs.h>
#include <linux/dmapool.h>
@@ -431,7 +433,6 @@ struct hisi_hba {
u32 intr_coal_count; /* Interrupt count to coalesce */

int cq_nvecs;
- unsigned int *reply_map;

/* bist */
enum sas_linkrate debugfs_bist_linkrate;
diff --git a/drivers/scsi/hisi_sas/hisi_sas_main.c b/drivers/scsi/hisi_sas/hisi_sas_main.c
index 52d5b9afbb18..cca94b296065 100644
--- a/drivers/scsi/hisi_sas/hisi_sas_main.c
+++ b/drivers/scsi/hisi_sas/hisi_sas_main.c
@@ -183,12 +183,13 @@ static void hisi_sas_slot_index_set(struct hisi_hba *hisi_hba, int slot_idx)
static int hisi_sas_slot_index_alloc(struct hisi_hba *hisi_hba,
struct scsi_cmnd *scsi_cmnd)
{
- int index;
void *bitmap = hisi_hba->slot_index_tags;
+ struct Scsi_Host *shost = hisi_hba->shost;
unsigned long flags;
+ int index;

- if (scsi_cmnd)
- return scsi_cmnd->request->tag;
+ if (shost->hostt->host_tagset && scsi_cmnd)
+ return scsi_cmnd->request->shared_tag;

spin_lock_irqsave(&hisi_hba->lock, flags);
index = find_next_zero_bit(bitmap, hisi_hba->slot_index_count,
@@ -421,6 +422,7 @@ static int hisi_sas_task_prep(struct sas_task *task,
struct device *dev = hisi_hba->dev;
int dlvry_queue_slot, dlvry_queue, rc, slot_idx;
int n_elem = 0, n_elem_dif = 0, n_elem_req = 0;
+ struct scsi_cmnd *scmd = NULL;
struct hisi_sas_dq *dq;
unsigned long flags;
int wr_q_index;
@@ -436,10 +438,23 @@ static int hisi_sas_task_prep(struct sas_task *task,
return -ECOMM;
}

- if (hisi_hba->reply_map) {
- int cpu = raw_smp_processor_id();
- unsigned int dq_index = hisi_hba->reply_map[cpu];
+ if (task->uldd_task) {
+ struct ata_queued_cmd *qc;
+
+ if (dev_is_sata(device)) {
+ qc = task->uldd_task;
+ scmd = qc->scsicmd;
+ } else {
+ scmd = task->uldd_task;
+ }
+ }

+ if (scmd) {
+ unsigned int dq_index;
+ u32 blk_tag;
+
+ blk_tag = blk_mq_unique_tag(scmd->request);
+ dq_index = blk_mq_unique_tag_to_hwq(blk_tag);
*dq_pointer = dq = &hisi_hba->dq[dq_index];
} else {
*dq_pointer = dq = sas_dev->dq;
@@ -468,21 +483,9 @@ static int hisi_sas_task_prep(struct sas_task *task,

if (hisi_hba->hw->slot_index_alloc)
rc = hisi_hba->hw->slot_index_alloc(hisi_hba, device);
- else {
- struct scsi_cmnd *scsi_cmnd = NULL;
-
- if (task->uldd_task) {
- struct ata_queued_cmd *qc;
+ else
+ rc = hisi_sas_slot_index_alloc(hisi_hba, scmd);

- if (dev_is_sata(device)) {
- qc = task->uldd_task;
- scsi_cmnd = qc->scsicmd;
- } else {
- scsi_cmnd = task->uldd_task;
- }
- }
- rc = hisi_sas_slot_index_alloc(hisi_hba, scsi_cmnd);
- }
if (rc < 0)
goto err_out_dif_dma_unmap;

diff --git a/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c b/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c
index bf5d5f138437..98f2bd24a23b 100644
--- a/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c
+++ b/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c
@@ -2353,66 +2353,35 @@ static irqreturn_t cq_interrupt_v3_hw(int irq_no, void *p)
return IRQ_HANDLED;
}

-static void setup_reply_map_v3_hw(struct hisi_hba *hisi_hba, int nvecs)
+static int interrupt_preinit_v3_hw(struct hisi_hba *hisi_hba)
{
- const struct cpumask *mask;
- int queue, cpu;
-
- for (queue = 0; queue < nvecs; queue++) {
- struct hisi_sas_cq *cq = &hisi_hba->cq[queue];
+ int vectors;
+ int max_msi = HISI_SAS_MSI_COUNT_V3_HW, min_msi;
+ struct Scsi_Host *shost = hisi_hba->shost;
+ struct irq_affinity desc = {
+ .pre_vectors = BASE_VECTORS_V3_HW,
+ };
+
+ min_msi = MIN_AFFINE_VECTORS_V3_HW;
+ vectors = pci_alloc_irq_vectors_affinity(hisi_hba->pci_dev,
+ min_msi, max_msi,
+ PCI_IRQ_MSI |
+ PCI_IRQ_AFFINITY,
+ &desc);
+ if (vectors < 0)
+ return -ENOENT;

- mask = pci_irq_get_affinity(hisi_hba->pci_dev, queue +
- BASE_VECTORS_V3_HW);
- if (!mask)
- goto fallback;
- cq->pci_irq_mask = mask;
- for_each_cpu(cpu, mask)
- hisi_hba->reply_map[cpu] = queue;
- }
- return;
+ hisi_hba->cq_nvecs = vectors - BASE_VECTORS_V3_HW;
+ shost->nr_hw_queues = hisi_hba->cq_nvecs;

-fallback:
- for_each_possible_cpu(cpu)
- hisi_hba->reply_map[cpu] = cpu % hisi_hba->queue_count;
- /* Don't clean all CQ masks */
+ return 0;
}

static int interrupt_init_v3_hw(struct hisi_hba *hisi_hba)
{
struct device *dev = hisi_hba->dev;
struct pci_dev *pdev = hisi_hba->pci_dev;
- int vectors, rc, i;
- int max_msi = HISI_SAS_MSI_COUNT_V3_HW, min_msi;
-
- if (auto_affine_msi_experimental) {
- struct irq_affinity desc = {
- .pre_vectors = BASE_VECTORS_V3_HW,
- };
-
- min_msi = MIN_AFFINE_VECTORS_V3_HW;
-
- hisi_hba->reply_map = devm_kcalloc(dev, nr_cpu_ids,
- sizeof(unsigned int),
- GFP_KERNEL);
- if (!hisi_hba->reply_map)
- return -ENOMEM;
- vectors = pci_alloc_irq_vectors_affinity(hisi_hba->pci_dev,
- min_msi, max_msi,
- PCI_IRQ_MSI |
- PCI_IRQ_AFFINITY,
- &desc);
- if (vectors < 0)
- return -ENOENT;
- setup_reply_map_v3_hw(hisi_hba, vectors - BASE_VECTORS_V3_HW);
- } else {
- min_msi = max_msi;
- vectors = pci_alloc_irq_vectors(hisi_hba->pci_dev, min_msi,
- max_msi, PCI_IRQ_MSI);
- if (vectors < 0)
- return vectors;
- }
-
- hisi_hba->cq_nvecs = vectors - BASE_VECTORS_V3_HW;
+ int rc, i;

rc = devm_request_irq(dev, pci_irq_vector(pdev, 1),
int_phy_up_down_bcast_v3_hw, 0,
@@ -3057,6 +3026,15 @@ static int debugfs_set_bist_v3_hw(struct hisi_hba *hisi_hba, bool enable)
return 0;
}

+static int hisi_sas_map_queues(struct Scsi_Host *shost)
+{
+ struct hisi_hba *hisi_hba = shost_priv(shost);
+ struct blk_mq_queue_map *qmap = &shost->tag_set.map[HCTX_TYPE_DEFAULT];
+
+ return blk_mq_pci_map_queues(qmap, hisi_hba->pci_dev,
+ BASE_VECTORS_V3_HW);
+}
+
static struct scsi_host_template sht_v3_hw = {
.name = DRV_NAME,
.module = THIS_MODULE,
@@ -3065,6 +3043,7 @@ static struct scsi_host_template sht_v3_hw = {
.slave_configure = hisi_sas_slave_configure,
.scan_finished = hisi_sas_scan_finished,
.scan_start = hisi_sas_scan_start,
+ .map_queues = hisi_sas_map_queues,
.change_queue_depth = sas_change_queue_depth,
.bios_param = sas_bios_param,
.this_id = -1,
@@ -3078,6 +3057,7 @@ static struct scsi_host_template sht_v3_hw = {
.shost_attrs = host_attrs_v3_hw,
.tag_alloc_policy = BLK_TAG_ALLOC_RR,
.host_reset = hisi_sas_host_reset,
+ .host_tagset = 1,
};

static const struct hisi_sas_hw hisi_sas_v3_hw = {
@@ -3249,6 +3229,9 @@ hisi_sas_v3_probe(struct pci_dev *pdev, const struct pci_device_id *id)
if (hisi_sas_debugfs_enable)
hisi_sas_debugfs_init(hisi_hba);

+ rc = interrupt_preinit_v3_hw(hisi_hba);
+ if (rc)
+ goto err_out_ha;
rc = scsi_add_host(shost, dev);
if (rc)
goto err_out_ha;
--
2.17.1
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