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scsi: mvsas: Use sas_task_find_rq() for tagging
The request associated with a SCSI command coming from the block layer has
a unique tag, so use that when possible for getting a slot.
Unfortunately we don't support reserved commands in the SCSI midlayer yet.
As such, SMP tasks - as an example - will not have a request associated, so
in the interim continue to manage those tags for that type of sas_task
internally.
We reserve an arbitrary 4 tags for these internal tags. Indeed, we already
decrement MVS_RSVD_SLOTS by 2 for the shost can_queue when flag
MVF_FLAG_SOC is set. This change was made in commit 20b09c2992
("[SCSI]
mvsas: add support for 94xx; layout change; bug fixes"), but what those 2
slots are used for is not obvious.
Also make the tag management functions static, where possible.
Signed-off-by: John Garry <john.garry@huawei.com>
Link: https://lore.kernel.org/r/1666091763-11023-8-git-send-email-john.garry@huawei.com
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
parent
ffc9f9bf3f
commit
2acf97f199
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@ -40,6 +40,7 @@ enum driver_configuration {
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MVS_ATA_CMD_SZ = 96, /* SATA command table buffer size */
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MVS_OAF_SZ = 64, /* Open address frame buffer size */
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MVS_QUEUE_SIZE = 64, /* Support Queue depth */
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MVS_RSVD_SLOTS = 4,
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MVS_SOC_CAN_QUEUE = MVS_SOC_SLOTS - 2,
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};
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@ -142,7 +142,7 @@ static void mvs_free(struct mvs_info *mvi)
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scsi_host_put(mvi->shost);
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list_for_each_entry(mwq, &mvi->wq_list, entry)
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cancel_delayed_work(&mwq->work_q);
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kfree(mvi->tags);
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kfree(mvi->rsvd_tags);
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kfree(mvi);
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}
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@ -284,7 +284,6 @@ static int mvs_alloc(struct mvs_info *mvi, struct Scsi_Host *shost)
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printk(KERN_DEBUG "failed to create dma pool %s.\n", pool_name);
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goto err_out;
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}
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mvi->tags_num = slot_nr;
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return 0;
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err_out:
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@ -367,8 +366,8 @@ static struct mvs_info *mvs_pci_alloc(struct pci_dev *pdev,
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mvi->sas = sha;
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mvi->shost = shost;
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mvi->tags = kzalloc(MVS_CHIP_SLOT_SZ>>3, GFP_KERNEL);
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if (!mvi->tags)
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mvi->rsvd_tags = bitmap_zalloc(MVS_RSVD_SLOTS, GFP_KERNEL);
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if (!mvi->rsvd_tags)
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goto err_out;
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if (MVS_CHIP_DISP->chip_ioremap(mvi))
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@ -469,6 +468,8 @@ static void mvs_post_sas_ha_init(struct Scsi_Host *shost,
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else
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can_queue = MVS_CHIP_SLOT_SZ;
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can_queue -= MVS_RSVD_SLOTS;
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shost->sg_tablesize = min_t(u16, SG_ALL, MVS_MAX_SG);
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shost->can_queue = can_queue;
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mvi->shost->cmd_per_lun = MVS_QUEUE_SIZE;
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@ -20,31 +20,34 @@ static int mvs_find_tag(struct mvs_info *mvi, struct sas_task *task, u32 *tag)
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return 0;
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}
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void mvs_tag_clear(struct mvs_info *mvi, u32 tag)
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static void mvs_tag_clear(struct mvs_info *mvi, u32 tag)
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{
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void *bitmap = mvi->tags;
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void *bitmap = mvi->rsvd_tags;
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clear_bit(tag, bitmap);
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}
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void mvs_tag_free(struct mvs_info *mvi, u32 tag)
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static void mvs_tag_free(struct mvs_info *mvi, u32 tag)
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{
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if (tag >= MVS_RSVD_SLOTS)
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return;
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mvs_tag_clear(mvi, tag);
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}
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void mvs_tag_set(struct mvs_info *mvi, unsigned int tag)
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static void mvs_tag_set(struct mvs_info *mvi, unsigned int tag)
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{
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void *bitmap = mvi->tags;
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void *bitmap = mvi->rsvd_tags;
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set_bit(tag, bitmap);
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}
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inline int mvs_tag_alloc(struct mvs_info *mvi, u32 *tag_out)
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static int mvs_tag_alloc(struct mvs_info *mvi, u32 *tag_out)
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{
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unsigned int index, tag;
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void *bitmap = mvi->tags;
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void *bitmap = mvi->rsvd_tags;
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index = find_first_zero_bit(bitmap, mvi->tags_num);
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index = find_first_zero_bit(bitmap, MVS_RSVD_SLOTS);
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tag = index;
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if (tag >= mvi->tags_num)
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if (tag >= MVS_RSVD_SLOTS)
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return -SAS_QUEUE_FULL;
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mvs_tag_set(mvi, tag);
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*tag_out = tag;
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@ -696,6 +699,7 @@ static int mvs_task_prep(struct sas_task *task, struct mvs_info *mvi, int is_tmf
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struct mvs_task_exec_info tei;
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struct mvs_slot_info *slot;
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u32 tag = 0xdeadbeef, n_elem = 0;
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struct request *rq;
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int rc = 0;
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if (!dev->port) {
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@ -760,9 +764,14 @@ static int mvs_task_prep(struct sas_task *task, struct mvs_info *mvi, int is_tmf
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n_elem = task->num_scatter;
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}
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rc = mvs_tag_alloc(mvi, &tag);
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if (rc)
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goto err_out;
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rq = sas_task_find_rq(task);
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if (rq) {
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tag = rq->tag + MVS_RSVD_SLOTS;
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} else {
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rc = mvs_tag_alloc(mvi, &tag);
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if (rc)
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goto err_out;
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}
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slot = &mvi->slot_info[tag];
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@ -857,7 +866,7 @@ int mvs_queue_command(struct sas_task *task, gfp_t gfp_flags)
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static void mvs_slot_free(struct mvs_info *mvi, u32 rx_desc)
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{
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u32 slot_idx = rx_desc & RXQ_SLOT_MASK;
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mvs_tag_clear(mvi, slot_idx);
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mvs_tag_free(mvi, slot_idx);
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}
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static void mvs_slot_task_free(struct mvs_info *mvi, struct sas_task *task,
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@ -370,8 +370,7 @@ struct mvs_info {
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u32 chip_id;
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const struct mvs_chip_info *chip;
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int tags_num;
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unsigned long *tags;
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unsigned long *rsvd_tags;
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/* further per-slot information */
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struct mvs_phy phy[MVS_MAX_PHYS];
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struct mvs_port port[MVS_MAX_PHYS];
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@ -424,10 +423,6 @@ struct mvs_task_exec_info {
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/******************** function prototype *********************/
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void mvs_get_sas_addr(void *buf, u32 buflen);
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void mvs_tag_clear(struct mvs_info *mvi, u32 tag);
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void mvs_tag_free(struct mvs_info *mvi, u32 tag);
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void mvs_tag_set(struct mvs_info *mvi, unsigned int tag);
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int mvs_tag_alloc(struct mvs_info *mvi, u32 *tag_out);
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void mvs_iounmap(void __iomem *regs);
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int mvs_ioremap(struct mvs_info *mvi, int bar, int bar_ex);
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void mvs_phys_reset(struct mvs_info *mvi, u32 phy_mask, int hard);
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