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Subject[PATCH 5/8] lightnvm: implement get log report chunk helpers
Date
From: Javier González <javier@javigon.com>

The 2.0 spec provides a report chunk log page that can be retrieved
using the stangard nvme get log page. This replaces the dedicated
get/put bad block table in 1.2.

This patch implements the helper functions to allow targets retrieve the
chunk metadata using get log page

Signed-off-by: Javier González <javier@cnexlabs.com>
---
drivers/lightnvm/core.c | 28 +++++++++++++++++++++++++
drivers/nvme/host/lightnvm.c | 50 ++++++++++++++++++++++++++++++++++++++++++++
include/linux/lightnvm.h | 32 ++++++++++++++++++++++++++++
3 files changed, 110 insertions(+)

diff --git a/drivers/lightnvm/core.c b/drivers/lightnvm/core.c
index 80492fa6ee76..6857a888544a 100644
--- a/drivers/lightnvm/core.c
+++ b/drivers/lightnvm/core.c
@@ -43,6 +43,8 @@ struct nvm_ch_map {
struct nvm_dev_map {
struct nvm_ch_map *chnls;
int nr_chnls;
+ int bch;
+ int blun;
};

static struct nvm_target *nvm_find_target(struct nvm_dev *dev, const char *name)
@@ -171,6 +173,9 @@ static struct nvm_tgt_dev *nvm_create_tgt_dev(struct nvm_dev *dev,
if (!dev_map->chnls)
goto err_chnls;

+ dev_map->bch = bch;
+ dev_map->blun = blun;
+
luns = kcalloc(nr_luns, sizeof(struct ppa_addr), GFP_KERNEL);
if (!luns)
goto err_luns;
@@ -561,6 +566,19 @@ static void nvm_unregister_map(struct nvm_dev *dev)
kfree(rmap);
}

+static unsigned long nvm_log_off_tgt_to_dev(struct nvm_tgt_dev *tgt_dev)
+{
+ struct nvm_dev_map *dev_map = tgt_dev->map;
+ struct nvm_geo *geo = &tgt_dev->geo;
+ int lun_off;
+ unsigned long off;
+
+ lun_off = dev_map->blun + dev_map->bch * geo->num_lun;
+ off = lun_off * geo->c.num_chk * sizeof(struct nvm_chunk_log_page);
+
+ return off;
+}
+
static void nvm_map_to_dev(struct nvm_tgt_dev *tgt_dev, struct ppa_addr *p)
{
struct nvm_dev_map *dev_map = tgt_dev->map;
@@ -720,6 +738,16 @@ static void nvm_free_rqd_ppalist(struct nvm_tgt_dev *tgt_dev,
nvm_dev_dma_free(tgt_dev->parent, rqd->ppa_list, rqd->dma_ppa_list);
}

+int nvm_get_chunk_log_page(struct nvm_tgt_dev *tgt_dev,
+ struct nvm_chunk_log_page *log,
+ unsigned long off, unsigned long len)
+{
+ struct nvm_dev *dev = tgt_dev->parent;
+
+ off += nvm_log_off_tgt_to_dev(tgt_dev);
+
+ return dev->ops->get_chunk_log_page(tgt_dev->parent, log, off, len);
+}

int nvm_set_tgt_bb_tbl(struct nvm_tgt_dev *tgt_dev, struct ppa_addr *ppas,
int nr_ppas, int type)
diff --git a/drivers/nvme/host/lightnvm.c b/drivers/nvme/host/lightnvm.c
index 7bc75182c723..355d9b0cf084 100644
--- a/drivers/nvme/host/lightnvm.c
+++ b/drivers/nvme/host/lightnvm.c
@@ -35,6 +35,10 @@ enum nvme_nvm_admin_opcode {
nvme_nvm_admin_set_bb_tbl = 0xf1,
};

+enum nvme_nvm_log_page {
+ NVME_NVM_LOG_REPORT_CHUNK = 0xCA,
+};
+
struct nvme_nvm_ph_rw {
__u8 opcode;
__u8 flags;
@@ -553,6 +557,50 @@ static int nvme_nvm_set_bb_tbl(struct nvm_dev *nvmdev, struct ppa_addr *ppas,
return ret;
}

+static int nvme_nvm_get_chunk_log_page(struct nvm_dev *nvmdev,
+ struct nvm_chunk_log_page *log,
+ unsigned long off,
+ unsigned long total_len)
+{
+ struct nvme_ns *ns = nvmdev->q->queuedata;
+ struct nvme_command c = { };
+ unsigned long offset = off, left = total_len;
+ unsigned long len, len_dwords;
+ void *buf = log;
+ int ret;
+
+ /* The offset needs to be dword-aligned */
+ if (offset & 0x3)
+ return -EINVAL;
+
+ do {
+ /* Send 256KB at a time */
+ len = (1 << 18) > left ? left : (1 << 18);
+ len_dwords = (len >> 2) - 1;
+
+ c.get_log_page.opcode = nvme_admin_get_log_page;
+ c.get_log_page.nsid = cpu_to_le32(ns->head->ns_id);
+ c.get_log_page.lid = NVME_NVM_LOG_REPORT_CHUNK;
+ c.get_log_page.lpol = cpu_to_le32(offset & 0xffffffff);
+ c.get_log_page.lpou = cpu_to_le32(offset >> 32);
+ c.get_log_page.numdl = cpu_to_le16(len_dwords & 0xffff);
+ c.get_log_page.numdu = cpu_to_le16(len_dwords >> 16);
+
+ ret = nvme_submit_sync_cmd(ns->ctrl->admin_q, &c, buf, len);
+ if (ret) {
+ dev_err(ns->ctrl->device,
+ "get chunk log page failed (%d)\n", ret);
+ break;
+ }
+
+ buf += len;
+ offset += len;
+ left -= len;
+ } while (left);
+
+ return ret;
+}
+
static inline void nvme_nvm_rqtocmd(struct nvm_rq *rqd, struct nvme_ns *ns,
struct nvme_nvm_command *c)
{
@@ -684,6 +732,8 @@ static struct nvm_dev_ops nvme_nvm_dev_ops = {
.get_bb_tbl = nvme_nvm_get_bb_tbl,
.set_bb_tbl = nvme_nvm_set_bb_tbl,

+ .get_chunk_log_page = nvme_nvm_get_chunk_log_page,
+
.submit_io = nvme_nvm_submit_io,
.submit_io_sync = nvme_nvm_submit_io_sync,

diff --git a/include/linux/lightnvm.h b/include/linux/lightnvm.h
index 1148b3f22b27..eb2900a18160 100644
--- a/include/linux/lightnvm.h
+++ b/include/linux/lightnvm.h
@@ -73,10 +73,13 @@ struct nvm_rq;
struct nvm_id;
struct nvm_dev;
struct nvm_tgt_dev;
+struct nvm_chunk_log_page;

typedef int (nvm_id_fn)(struct nvm_dev *);
typedef int (nvm_op_bb_tbl_fn)(struct nvm_dev *, struct ppa_addr, u8 *);
typedef int (nvm_op_set_bb_fn)(struct nvm_dev *, struct ppa_addr *, int, int);
+typedef int (nvm_get_chunk_lp_fn)(struct nvm_dev *, struct nvm_chunk_log_page *,
+ unsigned long, unsigned long);
typedef int (nvm_submit_io_fn)(struct nvm_dev *, struct nvm_rq *);
typedef int (nvm_submit_io_sync_fn)(struct nvm_dev *, struct nvm_rq *);
typedef void *(nvm_create_dma_pool_fn)(struct nvm_dev *, char *);
@@ -90,6 +93,8 @@ struct nvm_dev_ops {
nvm_op_bb_tbl_fn *get_bb_tbl;
nvm_op_set_bb_fn *set_bb_tbl;

+ nvm_get_chunk_lp_fn *get_chunk_log_page;
+
nvm_submit_io_fn *submit_io;
nvm_submit_io_sync_fn *submit_io_sync;

@@ -286,6 +291,30 @@ struct nvm_dev_geo {
struct nvm_common_geo c;
};

+enum {
+ /* Chunk states */
+ NVM_CHK_ST_FREE = 1 << 0,
+ NVM_CHK_ST_CLOSED = 1 << 1,
+ NVM_CHK_ST_OPEN = 1 << 2,
+ NVM_CHK_ST_OFFLINE = 1 << 3,
+ NVM_CHK_ST_HOST_USE = 1 << 7,
+
+ /* Chunk types */
+ NVM_CHK_TP_W_SEQ = 1 << 0,
+ NVM_CHK_TP_W_RAN = 1 << 2,
+ NVM_CHK_TP_SZ_SPEC = 1 << 4,
+};
+
+struct nvm_chunk_log_page {
+ __u8 state;
+ __u8 type;
+ __u8 wear_index;
+ __u8 rsvd[5];
+ __u64 slba;
+ __u64 cnlb;
+ __u64 wp;
+};
+
struct nvm_target {
struct list_head list;
struct nvm_tgt_dev *dev;
@@ -505,6 +534,9 @@ extern struct nvm_dev *nvm_alloc_dev(int);
extern int nvm_register(struct nvm_dev *);
extern void nvm_unregister(struct nvm_dev *);

+extern int nvm_get_chunk_log_page(struct nvm_tgt_dev *,
+ struct nvm_chunk_log_page *,
+ unsigned long, unsigned long);
extern int nvm_set_tgt_bb_tbl(struct nvm_tgt_dev *, struct ppa_addr *,
int, int);
extern int nvm_max_phys_sects(struct nvm_tgt_dev *);
--
2.7.4
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