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
---
drivers/scsi/ufs/ufshpb.c | 992 +-
drivers/scsi/ufs/ufshpb.h | 72 +++
2 files changed, 1060 insertions(+), 4 deletions(-)
diff --git a/drivers/scsi/ufs/ufshpb.c b/drivers/scsi/ufs/ufshpb.c
index 84a9af2fdc80..e1af4c2ed9ab 100644
--- a/drivers/scsi/ufs/ufshpb.c
+++ b/drivers/scsi/ufs/ufshpb.c
@@ -15,6 +15,7 @@
#include "ufshpb.h"
static struct ufshpb_driver ufshpb_drv;
+unsigned int ufshpb_host_map_kbytes = 1 * 1024;
static int ufshpb_create_sysfs(struct ufs_hba *hba, struct ufshpb_lu *hpb);
@@ -25,6 +26,63 @@ 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(>rsp_list_lock, flags);
+ if (!list_empty(>lh_inact_rgn) || !list_empty(>lh_act_srgn))
+ ret = false;
+ spin_unlock_irqrestore(>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_state);
@@ -59,6 +117,765 @@ static inline void ufshpb_lu_put(struct ufshpb_lu *hpb)
put_device(>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
