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Subject[PATCH 5/8] scsi: ufshpb: Region inactivation in host mode
Date
I host mode, the host is expected to send HPB-WRITE-BUFFER with
buffer-id = 0x1 when it inactivates a region.

Use the map-requests pool as there is no point in assigning a
designated cache for umap-requests.

Signed-off-by: Avri Altman <avri.altman@wdc.com>
---
drivers/scsi/ufs/ufshpb.c | 120 +++++++++++++++++++++++++++++++-------
drivers/scsi/ufs/ufshpb.h | 4 ++
2 files changed, 104 insertions(+), 20 deletions(-)

diff --git a/drivers/scsi/ufs/ufshpb.c b/drivers/scsi/ufs/ufshpb.c
index a16c0f2d5fac..c09c8dce0745 100644
--- a/drivers/scsi/ufs/ufshpb.c
+++ b/drivers/scsi/ufs/ufshpb.c
@@ -386,49 +386,66 @@ void ufshpb_prep(struct ufs_hba *hba, struct ufshcd_lrb *lrbp)
hpb->stats.hit_cnt++;
}

+static struct ufshpb_req *ufshpb_get_req(struct ufshpb_lu *hpb,
+ int rgn_idx, enum req_opf dir)
+{
+ struct ufshpb_req *rq;
+ struct request *req;
+
+ rq = kmem_cache_alloc(hpb->map_req_cache, GFP_KERNEL);
+ if (!rq)
+ return NULL;
+
+ req = blk_get_request(hpb->sdev_ufs_lu->request_queue,
+ dir, 0);
+ if (IS_ERR(req))
+ goto free_rq;
+
+ rq->hpb = hpb;
+ rq->req = req;
+ rq->rgn_idx = rgn_idx;
+
+ return rq;
+
+free_rq:
+ kmem_cache_free(hpb->map_req_cache, rq);
+ return NULL;
+}
+
+static void ufshpb_put_req(struct ufshpb_lu *hpb, struct ufshpb_req *rq)
+{
+ blk_put_request(rq->req);
+ kmem_cache_free(hpb->map_req_cache, rq);
+}
+
static struct ufshpb_req *ufshpb_get_map_req(struct ufshpb_lu *hpb,
struct ufshpb_subregion *srgn)
{
struct ufshpb_req *map_req;
- struct request *req;
struct bio *bio;

- map_req = kmem_cache_alloc(hpb->map_req_cache, GFP_KERNEL);
+ map_req = ufshpb_get_req(hpb, srgn->rgn_idx, REQ_OP_SCSI_IN);
if (!map_req)
return NULL;

- req = blk_get_request(hpb->sdev_ufs_lu->request_queue,
- REQ_OP_SCSI_IN, 0);
- if (IS_ERR(req))
- goto free_map_req;
-
bio = bio_alloc(GFP_KERNEL, hpb->pages_per_srgn);
if (!bio) {
- blk_put_request(req);
- goto free_map_req;
+ ufshpb_put_req(hpb, map_req);
+ return NULL;
}

- map_req->hpb = hpb;
- map_req->req = req;
map_req->bio = bio;
-
- map_req->rgn_idx = srgn->rgn_idx;
map_req->srgn_idx = srgn->srgn_idx;
map_req->mctx = srgn->mctx;

return map_req;
-
-free_map_req:
- kmem_cache_free(hpb->map_req_cache, map_req);
- return NULL;
}

static void ufshpb_put_map_req(struct ufshpb_lu *hpb,
- struct ufshpb_req *map_req)
+ struct ufshpb_req *map_req)
{
bio_put(map_req->bio);
- blk_put_request(map_req->req);
- kmem_cache_free(hpb->map_req_cache, map_req);
+ ufshpb_put_req(hpb, map_req);
}

static int ufshpb_clear_dirty_bitmap(struct ufshpb_lu *hpb,
@@ -483,6 +500,13 @@ static void ufshpb_activate_subregion(struct ufshpb_lu *hpb,
srgn->srgn_state = HPB_SRGN_VALID;
}

+static void ufshpb_umap_req_compl_fn(struct request *req, blk_status_t error)
+{
+ struct ufshpb_req *umap_req = (struct ufshpb_req *)req->end_io_data;
+
+ ufshpb_put_req(umap_req->hpb, umap_req);
+}
+
static void ufshpb_map_req_compl_fn(struct request *req, blk_status_t error)
{
struct ufshpb_req *map_req = (struct ufshpb_req *) req->end_io_data;
@@ -501,6 +525,14 @@ static void ufshpb_map_req_compl_fn(struct request *req, blk_status_t error)
ufshpb_put_map_req(map_req->hpb, map_req);
}

+static void ufshpb_set_write_buf_cmd(unsigned char *cdb, int rgn_idx)
+{
+ cdb[0] = UFSHPB_WRITE_BUFFER;
+ cdb[1] = UFSHPB_WRITE_BUFFER_ID;
+ put_unaligned_be16(rgn_idx, &cdb[2]);
+ cdb[9] = 0x00;
+}
+
static void ufshpb_set_read_buf_cmd(unsigned char *cdb, int rgn_idx,
int srgn_idx, int srgn_mem_size)
{
@@ -514,6 +546,27 @@ static void ufshpb_set_read_buf_cmd(unsigned char *cdb, int rgn_idx,
cdb[9] = 0x00;
}

+static int ufshpb_execute_umap_req(struct ufshpb_lu *hpb,
+ struct ufshpb_req *umap_req)
+{
+ struct request_queue *q;
+ struct request *req;
+ struct scsi_request *rq;
+
+ q = hpb->sdev_ufs_lu->request_queue;
+ req = umap_req->req;
+ req->timeout = 0;
+ req->end_io_data = (void *)umap_req;
+ rq = scsi_req(req);
+ ufshpb_set_write_buf_cmd(rq->cmd, umap_req->rgn_idx);
+ rq->cmd_len = HPB_WRITE_BUFFER_CMD_LENGTH;
+
+ blk_execute_rq_nowait(q, NULL, req, 1, ufshpb_umap_req_compl_fn);
+
+ hpb->stats.umap_req_cnt++;
+ return 0;
+}
+
static int ufshpb_execute_map_req(struct ufshpb_lu *hpb,
struct ufshpb_req *map_req)
{
@@ -673,6 +726,25 @@ static void ufshpb_purge_active_subregion(struct ufshpb_lu *hpb,
}
}

+static int ufshpb_issue_umap_req(struct ufshpb_lu *hpb,
+ struct ufshpb_region *rgn)
+{
+ struct ufshpb_req *umap_req;
+
+ umap_req = ufshpb_get_req(hpb, rgn->rgn_idx, REQ_OP_SCSI_OUT);
+ if (!umap_req)
+ return -ENOMEM;
+
+ if (ufshpb_execute_umap_req(hpb, umap_req))
+ goto free_umap_req;
+
+ return 0;
+
+free_umap_req:
+ ufshpb_put_req(hpb, umap_req);
+ return -EAGAIN;
+}
+
static void __ufshpb_evict_region(struct ufshpb_lu *hpb,
struct ufshpb_region *rgn)
{
@@ -680,6 +752,11 @@ static void __ufshpb_evict_region(struct ufshpb_lu *hpb,
struct ufshpb_subregion *srgn;
int srgn_idx;

+
+ if (ufshpb_mode == HPB_HOST_CONTROL &&
+ ufshpb_issue_umap_req(hpb, rgn))
+ return;
+
lru_info = &hpb->lru_info;

dev_dbg(&hpb->sdev_ufs_lu->sdev_dev, "evict region %d\n", rgn->rgn_idx);
@@ -1368,6 +1445,7 @@ ufshpb_sysfs_attr_show_func(rb_noti_cnt);
ufshpb_sysfs_attr_show_func(rb_active_cnt);
ufshpb_sysfs_attr_show_func(rb_inactive_cnt);
ufshpb_sysfs_attr_show_func(map_req_cnt);
+ufshpb_sysfs_attr_show_func(umap_req_cnt);

static struct attribute *hpb_dev_attrs[] = {
&dev_attr_hit_cnt.attr,
@@ -1376,6 +1454,7 @@ static struct attribute *hpb_dev_attrs[] = {
&dev_attr_rb_active_cnt.attr,
&dev_attr_rb_inactive_cnt.attr,
&dev_attr_map_req_cnt.attr,
+ &dev_attr_umap_req_cnt.attr,
NULL,
};

@@ -1392,6 +1471,7 @@ static void ufshpb_stat_init(struct ufshpb_lu *hpb)
hpb->stats.rb_active_cnt = 0;
hpb->stats.rb_inactive_cnt = 0;
hpb->stats.map_req_cnt = 0;
+ hpb->stats.umap_req_cnt = 0;
}

static int ufshpb_lu_hpb_init(struct ufs_hba *hba, struct ufshpb_lu *hpb)
diff --git a/drivers/scsi/ufs/ufshpb.h b/drivers/scsi/ufs/ufshpb.h
index b0e78728af38..47a8877f9cdb 100644
--- a/drivers/scsi/ufs/ufshpb.h
+++ b/drivers/scsi/ufs/ufshpb.h
@@ -35,8 +35,11 @@
/* hpb vender defined opcode */
#define UFSHPB_READ 0xF8
#define UFSHPB_READ_BUFFER 0xF9
+#define UFSHPB_WRITE_BUFFER 0xFA
#define UFSHPB_READ_BUFFER_ID 0x01
+#define UFSHPB_WRITE_BUFFER_ID 0x01
#define HPB_READ_BUFFER_CMD_LENGTH 10
+#define HPB_WRITE_BUFFER_CMD_LENGTH 10
#define LU_ENABLED_HPB_FUNC 0x02

#define HPB_RESET_REQ_RETRIES 10
@@ -158,6 +161,7 @@ struct ufshpb_stats {
u64 rb_active_cnt;
u64 rb_inactive_cnt;
u64 map_req_cnt;
+ u64 umap_req_cnt;
};

struct ufshpb_lu {
--
2.25.1
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