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Message-ID: <231786897.01592214002170.JavaMail.epsvc@epcpadp1>
Date: Mon, 15 Jun 2020 18:30:47 +0900
From: Daejun Park <daejun7.park@...sung.com>
To: Daejun Park <daejun7.park@...sung.com>,
ALIM AKHTAR <alim.akhtar@...sung.com>,
"avri.altman@....com" <avri.altman@....com>,
"jejb@...ux.ibm.com" <jejb@...ux.ibm.com>,
"martin.petersen@...cle.com" <martin.petersen@...cle.com>,
"asutoshd@...eaurora.org" <asutoshd@...eaurora.org>,
"beanhuo@...ron.com" <beanhuo@...ron.com>,
"stanley.chu@...iatek.com" <stanley.chu@...iatek.com>,
"cang@...eaurora.org" <cang@...eaurora.org>,
"bvanassche@....org" <bvanassche@....org>,
"tomas.winkler@...el.com" <tomas.winkler@...el.com>
CC: "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
Sang-yoon Oh <sangyoon.oh@...sung.com>,
Sung-Jun Park <sungjun07.park@...sung.com>,
yongmyung lee <ymhungry.lee@...sung.com>,
Jinyoung CHOI <j-young.choi@...sung.com>,
Adel Choi <adel.choi@...sung.com>,
BoRam Shin <boram.shin@...sung.com>
Subject: [RFC PATCH v2 4/5] scsi: ufs: L2P map management for HPB read
This is a patch for managing L2P map in HPB module.
The HPB divides logical addresses into several regions. A region consists
of several sub-regions. The sub-region is a basic unit where L2P mapping is
managed. The driver loads L2P mapping data of each sub-region. The loaded
sub-region is called active-state. The HPB driver unloads L2P mapping data
as region unit. The unloaded region is called inactive-state.
Sub-region/region candidates to be loaded and unloaded are delivered from
the UFS device. The UFS device delivers the recommended active sub-region
and inactivate region to the driver using sensedata.
The HPB module performs L2P mapping management on the host through the
delivered information.
A pinned region is a pre-set regions on the UFS device that is always
activate-state.
The data structure for map data request and L2P map uses mempool API,
minimizing allocation overhead while avoiding static allocation.
The map_work manages active/inactive by 2 "to-do" lists.
Each hpb lun maintains 2 "to-do" lists:
hpb->lh_inact_rgn - regions to be inactivated, and
hpb->lh_act_srgn - subregions to be activated
Those lists are maintained on IO completion.
Signed-off-by: Daejun Park <daejun7.park@...sung.com>
---
drivers/scsi/ufs/ufshpb.c | 971 +++++++++++++++++++++++++++++++++++++-
drivers/scsi/ufs/ufshpb.h | 72 +++
2 files changed, 1040 insertions(+), 3 deletions(-)
diff --git a/drivers/scsi/ufs/ufshpb.c b/drivers/scsi/ufs/ufshpb.c
index 07490679d2f1..6229c6fcb5e1 100644
--- a/drivers/scsi/ufs/ufshpb.c
+++ b/drivers/scsi/ufs/ufshpb.c
@@ -25,6 +25,63 @@ static inline int ufshpb_is_valid_srgn(struct ufshpb_region *rgn,
srgn->srgn_state == HPB_SRGN_VALID;
}
+static inline bool ufshpb_is_general_lun(int lun)
+{
+ return lun < UFS_UPIU_MAX_UNIT_NUM_ID;
+}
+
+static inline bool
+ufshpb_is_pinned_region(struct ufshpb_lu *hpb, int rgn_idx)
+{
+ if (hpb->lu_pinned_end != PINNED_NOT_SET &&
+ rgn_idx >= hpb->lu_pinned_start &&
+ rgn_idx <= hpb->lu_pinned_end)
+ return true;
+
+ return false;
+}
+
+static bool ufshpb_is_empty_rsp_lists(struct ufshpb_lu *hpb)
+{
+ bool ret = true;
+ unsigned long flags;
+
+ spin_lock_irqsave(&hpb->rsp_list_lock, flags);
+ if (!list_empty(&hpb->lh_inact_rgn) || !list_empty(&hpb->lh_act_srgn))
+ ret = false;
+ spin_unlock_irqrestore(&hpb->rsp_list_lock, flags);
+
+ return ret;
+}
+
+static inline int ufshpb_may_field_valid(struct ufs_hba *hba,
+ struct ufshcd_lrb *lrbp,
+ struct ufshpb_rsp_field *rsp_field)
+{
+ if (be16_to_cpu(rsp_field->sense_data_len) != DEV_SENSE_SEG_LEN ||
+ rsp_field->desc_type != DEV_DES_TYPE ||
+ rsp_field->additional_len != DEV_ADDITIONAL_LEN ||
+ rsp_field->hpb_type == HPB_RSP_NONE ||
+ rsp_field->active_rgn_cnt > MAX_ACTIVE_NUM ||
+ rsp_field->inactive_rgn_cnt > MAX_INACTIVE_NUM ||
+ (!rsp_field->active_rgn_cnt && !rsp_field->inactive_rgn_cnt))
+ return -EINVAL;
+
+ if (!ufshpb_is_general_lun(lrbp->lun)) {
+ dev_warn(hba->dev, "ufshpb: lun(%d) not supported\n",
+ lrbp->lun);
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+
+static inline struct ufshpb_lu *ufshpb_get_hpb_data(struct scsi_cmnd *cmd)
+{
+ return cmd->device->hostdata;
+}
+
static inline int ufshpb_get_state(struct ufshpb_lu *hpb)
{
return atomic_read(&hpb->hpb_state);
@@ -59,6 +116,767 @@ static inline void ufshpb_lu_put(struct ufshpb_lu *hpb)
put_device(&hpb->hpb_lu_dev);
}
+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);
+ if (!map_req)
+ return NULL;
+
+ req = blk_get_request(hpb->sdev_ufs_lu->request_queue,
+ REQ_OP_SCSI_IN, BLK_MQ_REQ_PREEMPT);
+ 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;
+ }
+
+ 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;
+ map_req->lun = hpb->lun;
+
+ return map_req;
+
+free_map_req:
+ kmem_cache_free(hpb->map_req_cache, map_req);
+ return NULL;
+}
+
+static inline void ufshpb_put_map_req(struct ufshpb_lu *hpb,
+ 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);
+}
+
+
+static inline int ufshpb_clear_dirty_bitmap(struct ufshpb_lu *hpb,
+ struct ufshpb_subregion *srgn)
+{
+ WARN_ON(!srgn->mctx);
+ bitmap_zero(srgn->mctx->ppn_dirty, hpb->entries_per_srgn);
+ return 0;
+}
+
+static void ufshpb_update_active_info(struct ufshpb_lu *hpb, int rgn_idx,
+ int srgn_idx)
+{
+ struct ufshpb_region *rgn;
+ struct ufshpb_subregion *srgn;
+
+ rgn = hpb->rgn_tbl + rgn_idx;
+ srgn = rgn->srgn_tbl + srgn_idx;
+
+ list_del_init(&rgn->list_inact_rgn);
+
+ if (list_empty(&srgn->list_act_srgn))
+ list_add_tail(&srgn->list_act_srgn, &hpb->lh_act_srgn);
+}
+
+static void ufshpb_update_inactive_info(struct ufshpb_lu *hpb, int rgn_idx)
+{
+ struct ufshpb_region *rgn;
+ struct ufshpb_subregion *srgn;
+ int srgn_idx;
+
+ rgn = hpb->rgn_tbl + rgn_idx;
+
+ for (srgn_idx = 0; srgn_idx < rgn->srgn_cnt; srgn_idx++) {
+ srgn = rgn->srgn_tbl + srgn_idx;
+
+ list_del_init(&srgn->list_act_srgn);
+ }
+
+ if (list_empty(&rgn->list_inact_rgn))
+ list_add_tail(&rgn->list_inact_rgn, &hpb->lh_inact_rgn);
+}
+
+static void ufshpb_activate_subregion(struct ufshpb_lu *hpb,
+ struct ufshpb_subregion *srgn)
+{
+ struct ufshpb_region *rgn;
+
+ /*
+ * If there is no mctx in subregion
+ * after I/O progress for HPB_READ_BUFFER, the region to which the
+ * subregion belongs was evicted.
+ * Mask sure the the region must not evict in I/O progress
+ */
+ WARN_ON(!srgn->mctx);
+
+ rgn = hpb->rgn_tbl + srgn->rgn_idx;
+
+ if (unlikely(rgn->rgn_state == HPB_RGN_INACTIVE)) {
+ dev_err(&hpb->hpb_lu_dev,
+ "region %d subregion %d evicted\n",
+ srgn->rgn_idx, srgn->srgn_idx);
+ return;
+ }
+ srgn->srgn_state = HPB_SRGN_VALID;
+}
+
+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;
+ struct ufshpb_lu *hpb = map_req->hpb;
+ struct ufshpb_subregion *srgn;
+ unsigned long flags;
+
+ srgn = hpb->rgn_tbl[map_req->rgn_idx].srgn_tbl +
+ map_req->srgn_idx;
+
+ spin_lock_irqsave(&hpb->hpb_state_lock, flags);
+ ufshpb_activate_subregion(hpb, srgn);
+ spin_unlock_irqrestore(&hpb->hpb_state_lock, flags);
+
+ ufshpb_put_map_req(map_req->hpb, map_req);
+ ufshpb_lu_put(hpb);
+}
+
+static inline void ufshpb_set_read_buf_cmd(unsigned char *cdb, int rgn_idx,
+ int srgn_idx, int srgn_mem_size)
+{
+ cdb[0] = UFSHPB_READ_BUFFER;
+ cdb[1] = UFSHPB_READ_BUFFER_ID;
+
+ put_unaligned_be16(rgn_idx, &cdb[2]);
+ put_unaligned_be16(srgn_idx, &cdb[4]);
+ put_unaligned_be24(srgn_mem_size, &cdb[6]);
+
+ cdb[9] = 0x00;
+}
+
+static int ufshpb_map_req_add_bio_page(struct ufshpb_lu *hpb,
+ struct request_queue *q, struct bio *bio,
+ struct ufshpb_map_ctx *mctx)
+{
+ int i, ret = 0;
+
+ for (i = 0; i < hpb->pages_per_srgn; i++) {
+ ret = bio_add_pc_page(q, bio, mctx->m_page[i], PAGE_SIZE, 0);
+ if (ret != PAGE_SIZE) {
+ dev_notice(&hpb->hpb_lu_dev,
+ "bio_add_pc_page fail %d\n", ret);
+ return -ENOMEM;
+ }
+ }
+
+ return 0;
+}
+
+static int ufshpb_execute_map_req(struct ufshpb_lu *hpb,
+ struct ufshpb_req *map_req)
+{
+ struct request_queue *q;
+ struct request *req;
+ struct scsi_request *rq;
+ int ret = 0;
+
+ q = hpb->sdev_ufs_lu->request_queue;
+ ret = ufshpb_map_req_add_bio_page(hpb, q, map_req->bio,
+ map_req->mctx);
+ if (ret) {
+ dev_notice(&hpb->hpb_lu_dev,
+ "map_req_add_bio_page fail %d - %d\n",
+ map_req->rgn_idx, map_req->srgn_idx);
+ return ret;
+ }
+
+ req = map_req->req;
+
+ blk_rq_append_bio(req, &map_req->bio);
+
+ req->timeout = 0;
+ req->end_io_data = (void *)map_req;
+
+ rq = scsi_req(req);
+ ufshpb_set_read_buf_cmd(rq->cmd, map_req->rgn_idx,
+ map_req->srgn_idx, hpb->srgn_mem_size);
+ rq->cmd_len = HPB_READ_BUFFER_CMD_LENGTH;
+
+ blk_execute_rq_nowait(q, NULL, req, 1, ufshpb_map_req_compl_fn);
+
+ atomic_inc(&hpb->stats.map_req_cnt);
+ return 0;
+}
+
+static struct ufshpb_map_ctx *ufshpb_get_map_ctx(struct ufshpb_lu *hpb)
+{
+ struct ufshpb_map_ctx *mctx;
+ int i, j;
+
+ mctx = mempool_alloc(ufshpb_drv.ufshpb_mctx_pool, GFP_KERNEL);
+ if (!mctx)
+ return NULL;
+
+ mctx->m_page = kmem_cache_alloc(hpb->m_page_cache, GFP_KERNEL);
+ if (!mctx->m_page)
+ goto release_mctx;
+
+ mctx->ppn_dirty = bitmap_zalloc(hpb->entries_per_srgn, GFP_KERNEL);
+ if (!mctx->ppn_dirty)
+ goto release_m_page;
+
+ for (i = 0; i < hpb->pages_per_srgn; i++) {
+ mctx->m_page[i] = mempool_alloc(ufshpb_drv.ufshpb_page_pool,
+ GFP_KERNEL);
+ if (!mctx->m_page[i]) {
+ for (j = 0; j < i; j++)
+ mempool_free(mctx->m_page[j],
+ ufshpb_drv.ufshpb_page_pool);
+ goto release_ppn_dirty;
+ }
+ clear_page(page_address(mctx->m_page[i]));
+ }
+
+ return mctx;
+release_ppn_dirty:
+ bitmap_free(mctx->ppn_dirty);
+release_m_page:
+ kmem_cache_free(hpb->m_page_cache, mctx->m_page);
+release_mctx:
+ mempool_free(mctx, ufshpb_drv.ufshpb_mctx_pool);
+ return NULL;
+}
+
+static inline void ufshpb_put_map_ctx(struct ufshpb_lu *hpb,
+ struct ufshpb_map_ctx *mctx)
+{
+ int i;
+
+ for (i = 0; i < hpb->pages_per_srgn; i++)
+ mempool_free(mctx->m_page[i],
+ ufshpb_drv.ufshpb_page_pool);
+
+ bitmap_free(mctx->ppn_dirty);
+ kmem_cache_free(hpb->m_page_cache, mctx->m_page);
+ mempool_free(mctx, ufshpb_drv.ufshpb_mctx_pool);
+}
+
+static int ufshpb_check_issue_state_srgns(struct ufshpb_lu *hpb,
+ struct ufshpb_region *rgn)
+{
+ struct ufshpb_subregion *srgn;
+ int srgn_idx;
+
+ for (srgn_idx = 0; srgn_idx < rgn->srgn_cnt; srgn_idx++) {
+ srgn = rgn->srgn_tbl + srgn_idx;
+
+ if (srgn->srgn_state == HPB_SRGN_ISSUED)
+ return -EPERM;
+ }
+ return 0;
+}
+
+static inline void ufshpb_add_lru_info(struct victim_select_info *lru_info,
+ struct ufshpb_region *rgn)
+{
+ rgn->rgn_state = HPB_RGN_ACTIVE;
+ list_add_tail(&rgn->list_lru_rgn, &lru_info->lh_lru_rgn);
+ atomic_inc(&lru_info->active_cnt);
+}
+
+static inline void ufshpb_hit_lru_info(struct victim_select_info *lru_info,
+ struct ufshpb_region *rgn)
+{
+ list_move_tail(&rgn->list_lru_rgn, &lru_info->lh_lru_rgn);
+}
+
+static struct ufshpb_region *ufshpb_victim_lru_info(struct ufshpb_lu *hpb)
+{
+ struct victim_select_info *lru_info = &hpb->lru_info;
+ struct ufshpb_region *rgn, *victim_rgn = NULL;
+
+ list_for_each_entry(rgn, &lru_info->lh_lru_rgn, list_lru_rgn) {
+ WARN_ON(!rgn);
+ if (ufshpb_check_issue_state_srgns(hpb, rgn))
+ continue;
+
+ victim_rgn = rgn;
+ break;
+ }
+
+ return victim_rgn;
+}
+
+static inline void ufshpb_cleanup_lru_info(struct victim_select_info *lru_info,
+ struct ufshpb_region *rgn)
+{
+ list_del_init(&rgn->list_lru_rgn);
+ rgn->rgn_state = HPB_RGN_INACTIVE;
+ atomic_dec(&lru_info->active_cnt);
+}
+
+static inline void ufshpb_purge_active_subregion(struct ufshpb_lu *hpb,
+ struct ufshpb_subregion *srgn)
+{
+ if (srgn->srgn_state != HPB_SRGN_UNUSED) {
+ ufshpb_put_map_ctx(hpb, srgn->mctx);
+ srgn->srgn_state = HPB_SRGN_UNUSED;
+ srgn->mctx = NULL;
+ }
+}
+
+static void __ufshpb_evict_region(struct ufshpb_lu *hpb,
+ struct ufshpb_region *rgn)
+{
+ struct victim_select_info *lru_info;
+ struct ufshpb_subregion *srgn;
+ int srgn_idx;
+
+ lru_info = &hpb->lru_info;
+
+ dev_dbg(&hpb->hpb_lu_dev, "evict region %d\n", rgn->rgn_idx);
+
+ ufshpb_cleanup_lru_info(lru_info, rgn);
+
+ for (srgn_idx = 0; srgn_idx < rgn->srgn_cnt; srgn_idx++) {
+ srgn = rgn->srgn_tbl + srgn_idx;
+
+ ufshpb_purge_active_subregion(hpb, srgn);
+ }
+}
+
+static int ufshpb_evict_region(struct ufshpb_lu *hpb, struct ufshpb_region *rgn)
+{
+ unsigned long flags;
+ int ret = 0;
+
+ spin_lock_irqsave(&hpb->hpb_state_lock, flags);
+ if (rgn->rgn_state == HPB_RGN_PINNED) {
+ dev_warn(&hpb->hpb_lu_dev,
+ "pinned region cannot drop-out. region %d\n",
+ rgn->rgn_idx);
+ goto out;
+ }
+ if (!list_empty(&rgn->list_lru_rgn)) {
+ if (ufshpb_check_issue_state_srgns(hpb, rgn)) {
+ ret = -EBUSY;
+ goto out;
+ }
+
+ __ufshpb_evict_region(hpb, rgn);
+ }
+out:
+ spin_unlock_irqrestore(&hpb->hpb_state_lock, flags);
+ return ret;
+}
+
+static inline struct
+ufshpb_rsp_field *ufshpb_get_hpb_rsp(struct ufshcd_lrb *lrbp)
+{
+ return (struct ufshpb_rsp_field *)&lrbp->ucd_rsp_ptr->sr.sense_data_len;
+}
+
+static int ufshpb_issue_map_req(struct ufshpb_lu *hpb,
+ struct ufshpb_region *rgn,
+ struct ufshpb_subregion *srgn)
+{
+ struct ufshpb_req *map_req;
+ unsigned long flags;
+ int ret;
+ int err = -EAGAIN;
+ bool alloc_required = false;
+ enum HPB_RGN_STATE state = HPB_SRGN_INVALID;
+
+ spin_lock_irqsave(&hpb->hpb_state_lock, flags);
+ /*
+ * Since the region state change occurs only in the map_work,
+ * the state of the region cannot HPB_RGN_INACTIVE at this point.
+ * The region state must be changed in the map_work
+ */
+ WARN_ON(rgn->rgn_state == HPB_RGN_INACTIVE);
+
+ if (srgn->srgn_state == HPB_SRGN_UNUSED)
+ alloc_required = true;
+
+ /*
+ * If the subregion is already ISSUED state,
+ * a specific event (e.g., GC or wear-leveling, etc.) occurs in
+ * the device and HPB response for map loading is received.
+ * In this case, after finishing the HPB_READ_BUFFER,
+ * the next HPB_READ_BUFFER is performed again to obtain the latest
+ * map data.
+ */
+ if (srgn->srgn_state == HPB_SRGN_ISSUED)
+ goto unlock_out;
+
+ srgn->srgn_state = HPB_SRGN_ISSUED;
+ spin_unlock_irqrestore(&hpb->hpb_state_lock, flags);
+
+ if (alloc_required) {
+ WARN_ON(srgn->mctx);
+ srgn->mctx = ufshpb_get_map_ctx(hpb);
+ if (!srgn->mctx) {
+ dev_notice(&hpb->hpb_lu_dev,
+ "get map_ctx failed. region %d - %d\n",
+ rgn->rgn_idx, srgn->srgn_idx);
+ state = HPB_SRGN_UNUSED;
+ goto change_srgn_state;
+ }
+ }
+
+ ufshpb_clear_dirty_bitmap(hpb, srgn);
+ map_req = ufshpb_get_map_req(hpb, srgn);
+ if (!map_req)
+ goto change_srgn_state;
+
+ ret = ufshpb_lu_get(hpb);
+ if (unlikely(ret)) {
+ dev_notice(&hpb->hpb_lu_dev,
+ "%s: ufshpb_lu_get failed: %d", __func__, ret);
+ goto free_map_req;
+ }
+
+ ret = ufshpb_execute_map_req(hpb, map_req);
+ if (ret) {
+ dev_notice(&hpb->hpb_lu_dev,
+ "%s: issue map_req failed: %d, region %d - %d\n",
+ __func__, ret, srgn->rgn_idx, srgn->srgn_idx);
+ ufshpb_lu_put(hpb);
+ goto free_map_req;
+ }
+ return 0;
+
+free_map_req:
+ ufshpb_put_map_req(hpb, map_req);
+change_srgn_state:
+ spin_lock_irqsave(&hpb->hpb_state_lock, flags);
+ srgn->srgn_state = state;
+unlock_out:
+ spin_unlock_irqrestore(&hpb->hpb_state_lock, flags);
+ return err;
+}
+
+static int ufshpb_add_region(struct ufshpb_lu *hpb, struct ufshpb_region *rgn)
+{
+ struct ufshpb_region *victim_rgn;
+ struct victim_select_info *lru_info = &hpb->lru_info;
+ unsigned long flags;
+ int ret = 0;
+
+ spin_lock_irqsave(&hpb->hpb_state_lock, flags);
+ /*
+ * If region belongs to lru_list, just move the region
+ * to the front of lru list. because the state of the region
+ * is already active-state
+ */
+ if (!list_empty(&rgn->list_lru_rgn)) {
+ ufshpb_hit_lru_info(lru_info, rgn);
+ goto out;
+ }
+
+ if (rgn->rgn_state == HPB_RGN_INACTIVE) {
+ if (atomic_read(&lru_info->active_cnt)
+ == lru_info->max_lru_active_cnt) {
+ /*
+ * If the maximum number of active regions
+ * is exceeded, evict the least recently used region.
+ * This case may occur when the device responds
+ * to the eviction information late.
+ * It is okay to evict the least recently used region,
+ * because the device could detect this region
+ * by not issuing HPB_READ
+ */
+ victim_rgn = ufshpb_victim_lru_info(hpb);
+ if (!victim_rgn) {
+ dev_warn(&hpb->hpb_lu_dev,
+ "cannot get victim region error\n");
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ dev_dbg(&hpb->hpb_lu_dev,
+ "LRU full (%d), choost victim %d\n",
+ atomic_read(&lru_info->active_cnt),
+ victim_rgn->rgn_idx);
+ __ufshpb_evict_region(hpb, victim_rgn);
+ }
+
+ /*
+ * When a region is added to lru_info list_head,
+ * it is guaranteed that the subregion has been
+ * assigned all mctx. If failed, try to receive mctx again
+ * without being added to lru_info list_head
+ */
+ ufshpb_add_lru_info(lru_info, rgn);
+ }
+out:
+ spin_unlock_irqrestore(&hpb->hpb_state_lock, flags);
+ return ret;
+}
+
+static void ufshpb_rsp_req_region_update(struct ufshpb_lu *hpb,
+ struct ufshpb_rsp_field *rsp_field)
+{
+ int i, rgn_idx, srgn_idx;
+
+ /*
+ * If the active region and the inactive region are the same,
+ * we will inactivate this region.
+ * The device could check this (region inactivated) and
+ * will response the proper active region information
+ */
+ spin_lock(&hpb->rsp_list_lock);
+ for (i = 0; i < rsp_field->active_rgn_cnt; i++) {
+ rgn_idx =
+ be16_to_cpu(rsp_field->hpb_active_field[i].active_rgn);
+ srgn_idx =
+ be16_to_cpu(rsp_field->hpb_active_field[i].active_srgn);
+
+ dev_dbg(&hpb->hpb_lu_dev, "activate(%d) region %d - %d\n",
+ i, rgn_idx, srgn_idx);
+ ufshpb_update_active_info(hpb, rgn_idx, srgn_idx);
+ atomic_inc(&hpb->stats.rb_active_cnt);
+ }
+
+ for (i = 0; i < rsp_field->inactive_rgn_cnt; i++) {
+ rgn_idx = be16_to_cpu(rsp_field->hpb_inactive_field[i]);
+ dev_dbg(&hpb->hpb_lu_dev, "inactivate(%d) region %d\n",
+ i, rgn_idx);
+ ufshpb_update_inactive_info(hpb, rgn_idx);
+ atomic_inc(&hpb->stats.rb_inactive_cnt);
+ }
+ spin_unlock(&hpb->rsp_list_lock);
+
+ dev_dbg(&hpb->hpb_lu_dev, "Noti: #ACT %u #INACT %u\n",
+ rsp_field->active_rgn_cnt, rsp_field->inactive_rgn_cnt);
+
+ queue_work(ufshpb_drv.ufshpb_wq, &hpb->map_work);
+}
+
+/* routine : isr (ufs) */
+static void ufshpb_rsp_upiu(struct ufs_hba *hba, struct ufshcd_lrb *lrbp)
+{
+ struct ufshpb_lu *hpb;
+ struct ufshpb_rsp_field *rsp_field;
+ int data_seg_len, ret;
+
+ data_seg_len = be32_to_cpu(lrbp->ucd_rsp_ptr->header.dword_2)
+ & MASK_RSP_UPIU_DATA_SEG_LEN;
+
+ /* To flush remained rsp_list, we queue the map_work task */
+ if (!data_seg_len) {
+ if (!ufshpb_is_general_lun(lrbp->lun))
+ return;
+
+ hpb = ufshpb_get_hpb_data(lrbp->cmd);
+ ret = ufshpb_lu_get(hpb);
+ if (ret)
+ return;
+
+ if (!ufshpb_is_empty_rsp_lists(hpb))
+ queue_work(ufshpb_drv.ufshpb_wq, &hpb->map_work);
+
+ goto put_hpb;
+ }
+
+ /* Check HPB_UPDATE_ALERT */
+ if (!(lrbp->ucd_rsp_ptr->header.dword_2 &
+ UPIU_HEADER_DWORD(0, 2, 0, 0)))
+ return;
+
+ rsp_field = ufshpb_get_hpb_rsp(lrbp);
+ if (ufshpb_may_field_valid(hba, lrbp, rsp_field))
+ return;
+
+ hpb = ufshpb_get_hpb_data(lrbp->cmd);
+ ret = ufshpb_lu_get(hpb);
+ if (ret)
+ return;
+
+ atomic_inc(&hpb->stats.rb_noti_cnt);
+
+ switch (rsp_field->hpb_type) {
+ case HPB_RSP_REQ_REGION_UPDATE:
+ WARN_ON(data_seg_len != DEV_DATA_SEG_LEN);
+ ufshpb_rsp_req_region_update(hpb, rsp_field);
+ break;
+ case HPB_RSP_DEV_RESET:
+ dev_warn(&hpb->hpb_lu_dev,
+ "UFS device lost HPB information during PM.\n");
+ break;
+ default:
+ dev_notice(&hpb->hpb_lu_dev, "hpb_type is not available: %d\n",
+ rsp_field->hpb_type);
+ break;
+ }
+put_hpb:
+ ufshpb_lu_put(hpb);
+}
+
+static void ufshpb_add_active_list(struct ufshpb_lu *hpb,
+ struct ufshpb_region *rgn,
+ struct ufshpb_subregion *srgn)
+{
+ if (!list_empty(&rgn->list_inact_rgn))
+ return;
+
+ if (!list_empty(&srgn->list_act_srgn)) {
+ list_move(&srgn->list_act_srgn, &hpb->lh_act_srgn);
+ return;
+ }
+
+ list_add(&srgn->list_act_srgn, &hpb->lh_act_srgn);
+}
+
+static void ufshpb_add_pending_evict_list(struct ufshpb_lu *hpb,
+ struct ufshpb_region *rgn,
+ struct list_head *pending_list)
+{
+ struct ufshpb_subregion *srgn;
+ int srgn_idx;
+
+ if (!list_empty(&rgn->list_inact_rgn))
+ return;
+
+ for (srgn_idx = 0; srgn_idx < rgn->srgn_cnt; srgn_idx++) {
+ srgn = rgn->srgn_tbl + srgn_idx;
+
+ if (!list_empty(&srgn->list_act_srgn))
+ return;
+ }
+
+ list_add_tail(&rgn->list_inact_rgn, pending_list);
+}
+
+static void ufshpb_run_active_subregion_list(struct ufshpb_lu *hpb)
+{
+ struct ufshpb_region *rgn;
+ struct ufshpb_subregion *srgn;
+ struct ufshpb_map_ctx *mctx;
+ unsigned long flags;
+ int ret = 0;
+
+ spin_lock_irqsave(&hpb->rsp_list_lock, flags);
+ while ((srgn = list_first_entry_or_null(&hpb->lh_act_srgn,
+ struct ufshpb_subregion,
+ list_act_srgn))) {
+ list_del_init(&srgn->list_act_srgn);
+ spin_unlock_irqrestore(&hpb->rsp_list_lock, flags);
+
+ rgn = hpb->rgn_tbl + srgn->rgn_idx;
+ mctx = NULL;
+ ret = ufshpb_add_region(hpb, rgn);
+ if (ret)
+ break;
+
+ ret = ufshpb_issue_map_req(hpb, rgn, srgn);
+ if (ret) {
+ dev_notice(&hpb->hpb_lu_dev,
+ "issue map_req failed. ret %d, region %d - %d\n",
+ ret, rgn->rgn_idx, srgn->srgn_idx);
+ break;
+ }
+ spin_lock_irqsave(&hpb->rsp_list_lock, flags);
+ }
+
+ if (ret) {
+ dev_notice(&hpb->hpb_lu_dev, "region %d - %d, will retry\n",
+ rgn->rgn_idx, srgn->srgn_idx);
+ spin_lock_irqsave(&hpb->rsp_list_lock, flags);
+ ufshpb_add_active_list(hpb, rgn, srgn);
+ }
+ spin_unlock_irqrestore(&hpb->rsp_list_lock, flags);
+}
+
+static void ufshpb_run_inactive_region_list(struct ufshpb_lu *hpb)
+{
+ struct ufshpb_region *rgn;
+ unsigned long flags;
+ int ret;
+ LIST_HEAD(pending_list);
+
+ spin_lock_irqsave(&hpb->rsp_list_lock, flags);
+ while ((rgn = list_first_entry_or_null(&hpb->lh_inact_rgn,
+ struct ufshpb_region,
+ list_inact_rgn))) {
+ list_del_init(&rgn->list_inact_rgn);
+ spin_unlock_irqrestore(&hpb->rsp_list_lock, flags);
+
+ ret = ufshpb_evict_region(hpb, rgn);
+ if (ret) {
+ spin_lock_irqsave(&hpb->rsp_list_lock, flags);
+ ufshpb_add_pending_evict_list(hpb, rgn, &pending_list);
+ spin_unlock_irqrestore(&hpb->rsp_list_lock, flags);
+ }
+
+ spin_lock_irqsave(&hpb->rsp_list_lock, flags);
+ }
+
+ list_splice(&pending_list, &hpb->lh_inact_rgn);
+ spin_unlock_irqrestore(&hpb->rsp_list_lock, flags);
+}
+
+static void ufshpb_map_work_handler(struct work_struct *work)
+{
+ struct ufshpb_lu *hpb;
+ int ret;
+
+ hpb = container_of(work, struct ufshpb_lu, map_work);
+ ret = ufshpb_lu_get(hpb);
+ if (ret) {
+ dev_info(&hpb->hpb_lu_dev, "%s: exit, state %d\n",
+ __func__, ufshpb_get_state(hpb));
+ return;
+ }
+
+ ufshpb_run_inactive_region_list(hpb);
+ ufshpb_run_active_subregion_list(hpb);
+
+ ufshpb_lu_put(hpb);
+}
+
+/*
+ * this function doesn't need to hold lock due to be called in init.
+ * (hpb_state_lock, rsp_list_lock, etc..)
+ */
+static int ufshpb_init_pinned_active_region(struct ufs_hba *hba,
+ struct ufshpb_lu *hpb,
+ struct ufshpb_region *rgn)
+{
+ struct ufshpb_subregion *srgn;
+ int srgn_idx, i;
+ int err = 0;
+
+ for (srgn_idx = 0; srgn_idx < rgn->srgn_cnt; srgn_idx++) {
+ srgn = rgn->srgn_tbl + srgn_idx;
+
+ srgn->mctx = ufshpb_get_map_ctx(hpb);
+ srgn->srgn_state = HPB_SRGN_INVALID;
+ if (!srgn->mctx) {
+ dev_err(hba->dev,
+ "alloc mctx for pinned region failed\n");
+ goto release;
+ }
+
+ list_add_tail(&srgn->list_act_srgn, &hpb->lh_act_srgn);
+ }
+
+ rgn->rgn_state = HPB_RGN_PINNED;
+ return 0;
+
+release:
+ for (i = 0; i < srgn_idx; i++) {
+ srgn = rgn->srgn_tbl + i;
+ ufshpb_put_map_ctx(hpb, srgn->mctx);
+ }
+ return err;
+}
+
static void ufshpb_init_subregion_tbl(struct ufshpb_lu *hpb,
struct ufshpb_region *rgn)
{
@@ -101,6 +919,8 @@ static void ufshpb_init_lu_parameter(struct ufs_hba *hba,
hpb->lu_pinned_end = hpb_lu_info->num_pinned ?
(hpb_lu_info->pinned_start + hpb_lu_info->num_pinned - 1)
: PINNED_NOT_SET;
+ hpb->lru_info.max_lru_active_cnt =
+ hpb_lu_info->max_active_rgns - hpb_lu_info->num_pinned;
rgn_mem_size = (1ULL << hpb_dev_info->rgn_size) * HPB_RGN_SIZE_UNIT
/ HPB_ENTRY_BLOCK_SIZE * HPB_ENTRY_SIZE;
@@ -154,6 +974,9 @@ static int ufshpb_alloc_region_tbl(struct ufs_hba *hba, struct ufshpb_lu *hpb)
rgn = rgn_table + rgn_idx;
rgn->rgn_idx = rgn_idx;
+ INIT_LIST_HEAD(&rgn->list_inact_rgn);
+ INIT_LIST_HEAD(&rgn->list_lru_rgn);
+
if (rgn_idx == hpb->rgns_per_lu - 1)
srgn_cnt = ((hpb->srgns_per_lu - 1) %
hpb->srgns_per_rgn) + 1;
@@ -163,7 +986,13 @@ static int ufshpb_alloc_region_tbl(struct ufs_hba *hba, struct ufshpb_lu *hpb)
goto release_srgn_table;
ufshpb_init_subregion_tbl(hpb, rgn);
- rgn->rgn_state = HPB_RGN_INACTIVE;
+ if (ufshpb_is_pinned_region(hpb, rgn_idx)) {
+ ret = ufshpb_init_pinned_active_region(hba, hpb, rgn);
+ if (ret)
+ goto release_srgn_table;
+ } else {
+ rgn->rgn_state = HPB_RGN_INACTIVE;
+ }
}
return 0;
@@ -187,7 +1016,10 @@ static void ufshpb_destroy_subregion_tbl(struct ufshpb_lu *hpb,
struct ufshpb_subregion *srgn;
srgn = rgn->srgn_tbl + srgn_idx;
- srgn->srgn_state = HPB_SRGN_UNUSED;
+ if (srgn->srgn_state != HPB_SRGN_UNUSED) {
+ srgn->srgn_state = HPB_SRGN_UNUSED;
+ ufshpb_put_map_ctx(hpb, srgn->mctx);
+ }
}
}
@@ -217,6 +1049,33 @@ static int ufshpb_lu_hpb_init(struct ufs_hba *hba, struct ufshpb_lu *hpb,
int ret;
spin_lock_init(&hpb->hpb_state_lock);
+ spin_lock_init(&hpb->rsp_list_lock);
+
+ INIT_LIST_HEAD(&hpb->lru_info.lh_lru_rgn);
+ INIT_LIST_HEAD(&hpb->lh_act_srgn);
+ INIT_LIST_HEAD(&hpb->lh_inact_rgn);
+ INIT_LIST_HEAD(&hpb->list_hpb_lu);
+
+ INIT_WORK(&hpb->map_work, ufshpb_map_work_handler);
+
+ hpb->map_req_cache = kmem_cache_create("ufshpb_req_cache",
+ sizeof(struct ufshpb_req), 0, 0, NULL);
+ if (!hpb->map_req_cache) {
+ dev_err(hba->dev, "ufshpb(%d) ufshpb_req_cache create fail",
+ hpb->lun);
+ return -ENOMEM;
+ }
+
+ hpb->m_page_cache = kmem_cache_create("ufshpb_m_page_cache",
+ sizeof(struct page *) * hpb->pages_per_srgn,
+ 0, 0, NULL);
+ if (!hpb->m_page_cache) {
+ dev_err(hba->dev, "ufshpb(%d) ufshpb_m_page_cache create fail",
+ hpb->lun);
+ ret = -ENOMEM;
+ goto release_req_cache;
+ }
+
ret = ufshpb_alloc_region_tbl(hba, hpb);
if (ret)
@@ -230,6 +1089,10 @@ static int ufshpb_lu_hpb_init(struct ufs_hba *hba, struct ufshpb_lu *hpb,
release_rgn_table:
ufshpb_destroy_region_tbl(hpb);
+release_m_page_cache:
+ kmem_cache_destroy(hpb->m_page_cache);
+release_req_cache:
+ kmem_cache_destroy(hpb->map_req_cache);
return ret;
}
@@ -261,10 +1124,42 @@ static struct ufshpb_lu *ufshpb_alloc_hpb_lu(struct ufs_hba *hba, int lun,
return NULL;
}
+static void ufshpb_discard_rsp_lists(struct ufshpb_lu *hpb)
+{
+ struct ufshpb_region *rgn, *next_rgn;
+ struct ufshpb_subregion *srgn, *next_srgn;
+ unsigned long flags;
+
+ /*
+ * If the device reset occurred, the remained HPB region information
+ * may be stale. Therefore, by dicarding the lists of HPB response
+ * that remained after reset, it prevents unnecessary work.
+ */
+ spin_lock_irqsave(&hpb->rsp_list_lock, flags);
+ list_for_each_entry_safe(rgn, next_rgn, &hpb->lh_inact_rgn,
+ list_inact_rgn)
+ list_del_init(&rgn->list_inact_rgn);
+
+ list_for_each_entry_safe(srgn, next_srgn, &hpb->lh_act_srgn,
+ list_act_srgn)
+ list_del_init(&srgn->list_act_srgn);
+ spin_unlock_irqrestore(&hpb->rsp_list_lock, flags);
+}
+
+static inline void ufshpb_cancel_jobs(struct ufshpb_lu *hpb)
+{
+ cancel_work_sync(&hpb->map_work);
+}
+
static void ufshpb_lu_release(struct ufshpb_lu *hpb)
{
+ ufshpb_cancel_jobs(hpb);
+
ufshpb_destroy_region_tbl(hpb);
+ kmem_cache_destroy(hpb->map_req_cache);
+ kmem_cache_destroy(hpb->m_page_cache);
+
list_del_init(&hpb->list_hpb_lu);
}
@@ -351,6 +1246,9 @@ static void ufshpb_reset_host(struct ufs_hba *hba)
dev_info(&hpb->hpb_lu_dev, "ufshpb run reset_host");
ufshpb_set_state(hpb, HPB_RESET);
+ ufshpb_cancel_jobs(hpb);
+ ufshpb_discard_rsp_lists(hpb);
+
ufshpb_lu_put(hpb);
}
}
@@ -365,6 +1263,7 @@ static void ufshpb_suspend(struct ufs_hba *hba)
dev_info(&hpb->hpb_lu_dev, "ufshpb goto suspend");
ufshpb_set_state(hpb, HPB_SUSPEND);
+ ufshpb_cancel_jobs(hpb);
ufshpb_lu_put(hpb);
}
@@ -380,6 +1279,9 @@ static void ufshpb_resume(struct ufs_hba *hba)
dev_info(&hpb->hpb_lu_dev, "ufshpb resume");
ufshpb_set_state(hpb, HPB_PRESENT);
+ if (!ufshpb_is_empty_rsp_lists(hpb))
+ queue_work(ufshpb_drv.ufshpb_wq, &hpb->map_work);
+
ufshpb_lu_put(hpb);
}
}
@@ -661,6 +1563,14 @@ static void ufshpb_scan_hpb_lu(struct ufs_hba *hba,
list_for_each_entry(hpb, &ufshpb_drv.lh_hpb_lu, list_hpb_lu) {
dev_info(&hpb->hpb_lu_dev, "set state to present\n");
ufshpb_set_state(hpb, HPB_PRESENT);
+
+ if ((hpb->lu_pinned_end - hpb->lu_pinned_start) > 0) {
+ dev_info(&hpb->hpb_lu_dev,
+ "loading pinned regions %d - %d\n",
+ hpb->lu_pinned_start, hpb->lu_pinned_end);
+ queue_work(ufshpb_drv.ufshpb_wq,
+ &hpb->map_work);
+ }
}
}
}
@@ -728,6 +1638,8 @@ static int ufshpb_remove(struct device *dev)
sdev = hpb->sdev_ufs_lu;
sdev->hostdata = NULL;
+ ufshpb_cancel_jobs(hpb);
+
device_del(&hpb->hpb_lu_dev);
dev_info(&hpb->hpb_lu_dev, "hpb_lu_dev refcnt %d\n",
@@ -768,16 +1680,69 @@ static int __init ufshpb_init(void)
unsigned int pool_size;
int ret;
+
+ ufshpb_drv.ufshpb_mctx_cache = kmem_cache_create("ufshpb_mctx_cache",
+ sizeof(struct ufshpb_map_ctx),
+ 0, 0, NULL);
+ if (!ufshpb_drv.ufshpb_mctx_cache) {
+ pr_err("ufshpb: cannot init mctx cache\n");
+ return -ENOMEM;
+ }
+
+ pool_size = DIV_ROUND_UP(ufshpb_host_map_kbytes * 1024, 4096);
+ pr_info("%s:%d ufshpb_host_map_kbytes %u pool_size %u\n",
+ __func__, __LINE__, ufshpb_host_map_kbytes, pool_size);
+
+ ufshpb_drv.ufshpb_mctx_pool = mempool_create_slab_pool(
+ pool_size, ufshpb_drv.ufshpb_mctx_cache);
+ if (!ufshpb_drv.ufshpb_mctx_pool) {
+ pr_err("ufshpb: cannot init mctx pool\n");
+ ret = -ENOMEM;
+ goto release_mctx_cache;
+ }
+
+ ufshpb_drv.ufshpb_page_pool = mempool_create_page_pool(pool_size, 0);
+ if (!ufshpb_drv.ufshpb_page_pool) {
+ pr_err("ufshpb: cannot init page pool\n");
+ ret = -ENOMEM;
+ goto release_mctx_pool;
+ }
+
+ ufshpb_drv.ufshpb_wq = alloc_workqueue("ufshpb-wq",
+ WQ_UNBOUND | WQ_MEM_RECLAIM, 0);
+ if (!ufshpb_drv.ufshpb_wq) {
+ pr_err("ufshpb: alloc workqueue failed\n");
+ ret = -ENOMEM;
+ goto release_page_pool;
+ }
+
ret = driver_register(&ufshpb_drv.drv);
- if (ret)
+ if (ret) {
pr_err("ufshpb: driver register failed\n");
+ goto release_wq;
+ }
+ return 0;
+release_wq:
+ destroy_workqueue(ufshpb_drv.ufshpb_wq);
+release_page_pool:
+ mempool_destroy(ufshpb_drv.ufshpb_page_pool);
+release_mctx_pool:
+ mempool_destroy(ufshpb_drv.ufshpb_mctx_pool);
+release_mctx_cache:
+ kmem_cache_destroy(ufshpb_drv.ufshpb_mctx_cache);
return ret;
}
static void __exit ufshpb_exit(void)
{
driver_unregister(&ufshpb_drv.drv);
+
+ mempool_destroy(ufshpb_drv.ufshpb_page_pool);
+ mempool_destroy(ufshpb_drv.ufshpb_mctx_pool);
+ kmem_cache_destroy(ufshpb_drv.ufshpb_mctx_cache);
+
+ destroy_workqueue(ufshpb_drv.ufshpb_wq);
}
MODULE_AUTHOR("Yongmyong Lee <ymhungry.lee@...sung.com>");
diff --git a/drivers/scsi/ufs/ufshpb.h b/drivers/scsi/ufs/ufshpb.h
index eaa4a3e035b1..d9c27348d354 100644
--- a/drivers/scsi/ufs/ufshpb.h
+++ b/drivers/scsi/ufs/ufshpb.h
@@ -101,10 +101,36 @@ struct ufshpb_lu_info {
int max_active_rgns;
};
+struct ufshpb_active_field {
+ __be16 active_rgn;
+ __be16 active_srgn;
+} __packed;
+
+struct ufshpb_rsp_field {
+ __be16 sense_data_len;
+ u8 desc_type;
+ u8 additional_len;
+ u8 hpb_type;
+ u8 reserved;
+ u8 active_rgn_cnt;
+ u8 inactive_rgn_cnt;
+ struct ufshpb_active_field hpb_active_field[2];
+ __be16 hpb_inactive_field[2];
+} __packed;
+
+struct ufshpb_map_ctx {
+ struct page **m_page;
+ unsigned long *ppn_dirty;
+};
+
struct ufshpb_subregion {
+ struct ufshpb_map_ctx *mctx;
enum HPB_SRGN_STATE srgn_state;
int rgn_idx;
int srgn_idx;
+
+ /* below information is used by rsp_list */
+ struct list_head list_act_srgn;
};
struct ufshpb_region {
@@ -112,6 +138,39 @@ struct ufshpb_region {
enum HPB_RGN_STATE rgn_state;
int rgn_idx;
int srgn_cnt;
+
+ /* below information is used by rsp_list */
+ struct list_head list_inact_rgn;
+
+ /* below information is used by lru */
+ struct list_head list_lru_rgn;
+};
+
+/**
+ * struct ufshpb_req - UFSHPB READ BUFFER (for caching map) request structure
+ * @req: block layer request for READ BUFFER
+ * @bio: bio for holding map page
+ * @hpb: ufshpb_lu structure that related to the L2P map
+ * @mctx: L2P map information
+ * @rgn_idx: target region index
+ * @srgn_idx: target sub-region index
+ * @lun: target logical unit number
+ */
+struct ufshpb_req {
+ struct request *req;
+ struct bio *bio;
+ struct ufshpb_lu *hpb;
+ struct ufshpb_map_ctx *mctx;
+
+ unsigned int rgn_idx;
+ unsigned int srgn_idx;
+ unsigned int lun;
+};
+
+struct victim_select_info {
+ struct list_head lh_lru_rgn;
+ int max_lru_active_cnt; /* supported hpb #region - pinned #region */
+ atomic_t active_cnt;
};
struct ufshpb_stats {
@@ -134,6 +193,16 @@ struct ufshpb_lu {
spinlock_t hpb_state_lock;
atomic_t hpb_state; /* hpb_state_lock */
+ spinlock_t rsp_list_lock;
+ struct list_head lh_act_srgn; /* rsp_list_lock */
+ struct list_head lh_inact_rgn; /* rsp_list_lock */
+
+ /* cached L2P map management worker */
+ struct work_struct map_work;
+
+ /* for selecting victim */
+ struct victim_select_info lru_info;
+
/* pinned region information */
u32 lu_pinned_start;
u32 lu_pinned_end;
@@ -152,6 +221,9 @@ struct ufshpb_lu {
struct ufshpb_stats stats;
+ struct kmem_cache *map_req_cache;
+ struct kmem_cache *m_page_cache;
+
struct ufsf_feature_info *ufsf;
struct list_head list_hpb_lu;
};
--
2.17.1
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