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Message-Id: <1519832975-25432-10-git-send-email-javier@cnexlabs.com>
Date: Wed, 28 Feb 2018 16:49:29 +0100
From: "Javier González" <jg@...htnvm.io>
To: mb@...htnvm.io
Cc: linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-nvme@...ts.infradead.org,
Javier González <javier@...xlabs.com>
Subject: [PATCH 09/15] lightnvm: implement get log report chunk helpers
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. It makes nvme_get_log_ext available
outside of nvme core so that we can use it form lightnvm.
Signed-off-by: Javier González <javier@...xlabs.com>
---
drivers/lightnvm/core.c | 11 +++++++
drivers/nvme/host/core.c | 6 ++--
drivers/nvme/host/lightnvm.c | 74 ++++++++++++++++++++++++++++++++++++++++++++
drivers/nvme/host/nvme.h | 3 ++
include/linux/lightnvm.h | 24 ++++++++++++++
5 files changed, 115 insertions(+), 3 deletions(-)
diff --git a/drivers/lightnvm/core.c b/drivers/lightnvm/core.c
index ed33e0b11788..4141871f460d 100644
--- a/drivers/lightnvm/core.c
+++ b/drivers/lightnvm/core.c
@@ -712,6 +712,17 @@ 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_meta(struct nvm_tgt_dev *tgt_dev, struct nvm_chk_meta *meta,
+ struct ppa_addr ppa, int nchks)
+{
+ struct nvm_dev *dev = tgt_dev->parent;
+
+ nvm_ppa_tgt_to_dev(tgt_dev, &ppa, 1);
+
+ return dev->ops->get_chk_meta(tgt_dev->parent, meta,
+ (sector_t)ppa.ppa, nchks);
+}
+EXPORT_SYMBOL(nvm_get_chunk_meta);
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/core.c b/drivers/nvme/host/core.c
index 2e9e9f973a75..af642ce6ba69 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -2127,9 +2127,9 @@ static int nvme_init_subsystem(struct nvme_ctrl *ctrl, struct nvme_id_ctrl *id)
return ret;
}
-static int nvme_get_log_ext(struct nvme_ctrl *ctrl, struct nvme_ns *ns,
- u8 log_page, void *log,
- size_t size, size_t offset)
+int nvme_get_log_ext(struct nvme_ctrl *ctrl, struct nvme_ns *ns,
+ u8 log_page, void *log,
+ size_t size, size_t offset)
{
struct nvme_command c = { };
unsigned long dwlen = size / 4 - 1;
diff --git a/drivers/nvme/host/lightnvm.c b/drivers/nvme/host/lightnvm.c
index f7135659f918..a1796241040f 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;
@@ -236,6 +240,16 @@ struct nvme_nvm_id20 {
__u8 vs[1024];
};
+struct nvme_nvm_chk_meta {
+ __u8 state;
+ __u8 type;
+ __u8 wi;
+ __u8 rsvd[5];
+ __le64 slba;
+ __le64 cnlb;
+ __le64 wp;
+};
+
/*
* Check we didn't inadvertently grow the command struct
*/
@@ -252,6 +266,9 @@ static inline void _nvme_nvm_check_size(void)
BUILD_BUG_ON(sizeof(struct nvme_nvm_bb_tbl) != 64);
BUILD_BUG_ON(sizeof(struct nvme_nvm_id20_addrf) != 8);
BUILD_BUG_ON(sizeof(struct nvme_nvm_id20) != NVME_IDENTIFY_DATA_SIZE);
+ BUILD_BUG_ON(sizeof(struct nvme_nvm_chk_meta) != 32);
+ BUILD_BUG_ON(sizeof(struct nvme_nvm_chk_meta) !=
+ sizeof(struct nvm_chk_meta));
}
static void nvme_nvm_set_addr_12(struct nvm_addr_format_12 *dst,
@@ -555,6 +572,61 @@ static int nvme_nvm_set_bb_tbl(struct nvm_dev *nvmdev, struct ppa_addr *ppas,
return ret;
}
+/*
+ * Expect the lba in device format
+ */
+static int nvme_nvm_get_chk_meta(struct nvm_dev *ndev,
+ struct nvm_chk_meta *meta,
+ sector_t slba, int nchks)
+{
+ struct nvm_geo *geo = &ndev->geo;
+ struct nvme_ns *ns = ndev->q->queuedata;
+ struct nvme_ctrl *ctrl = ns->ctrl;
+ struct nvme_nvm_chk_meta *dev_meta = (struct nvme_nvm_chk_meta *)meta;
+ struct ppa_addr ppa;
+ size_t left = nchks * sizeof(struct nvme_nvm_chk_meta);
+ size_t log_pos, offset, len;
+ int ret, i;
+
+ /* Normalize lba address space to obtain log offset */
+ ppa.ppa = slba;
+ ppa = dev_to_generic_addr(ndev, ppa);
+
+ log_pos = ppa.m.chk;
+ log_pos += ppa.m.pu * geo->num_chk;
+ log_pos += ppa.m.grp * geo->num_lun * geo->num_chk;
+
+ offset = log_pos * sizeof(struct nvme_nvm_chk_meta);
+
+ while (left) {
+ len = min_t(unsigned int, left, ctrl->max_hw_sectors << 9);
+
+ ret = nvme_get_log_ext(ctrl, ns, NVME_NVM_LOG_REPORT_CHUNK,
+ dev_meta, len, offset);
+ if (ret) {
+ dev_err(ctrl->device, "Get REPORT CHUNK log error\n");
+ break;
+ }
+
+ for (i = 0; i < len; i += sizeof(struct nvme_nvm_chk_meta)) {
+ meta->state = dev_meta->state;
+ meta->type = dev_meta->type;
+ meta->wi = dev_meta->wi;
+ meta->slba = le64_to_cpu(dev_meta->slba);
+ meta->cnlb = le64_to_cpu(dev_meta->cnlb);
+ meta->wp = le64_to_cpu(dev_meta->wp);
+
+ meta++;
+ dev_meta++;
+ }
+
+ offset += len;
+ left -= len;
+ }
+
+ return ret;
+}
+
static inline void nvme_nvm_rqtocmd(struct nvm_rq *rqd, struct nvme_ns *ns,
struct nvme_nvm_command *c)
{
@@ -686,6 +758,8 @@ 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_chk_meta = nvme_nvm_get_chk_meta,
+
.submit_io = nvme_nvm_submit_io,
.submit_io_sync = nvme_nvm_submit_io_sync,
diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h
index 1ca08f4993ba..505f797f8c6c 100644
--- a/drivers/nvme/host/nvme.h
+++ b/drivers/nvme/host/nvme.h
@@ -396,6 +396,9 @@ int nvme_reset_ctrl(struct nvme_ctrl *ctrl);
int nvme_delete_ctrl(struct nvme_ctrl *ctrl);
int nvme_delete_ctrl_sync(struct nvme_ctrl *ctrl);
+int nvme_get_log_ext(struct nvme_ctrl *ctrl, struct nvme_ns *ns,
+ u8 log_page, void *log, size_t size, size_t offset);
+
extern const struct attribute_group nvme_ns_id_attr_group;
extern const struct block_device_operations nvme_ns_head_ops;
diff --git a/include/linux/lightnvm.h b/include/linux/lightnvm.h
index e878b95aeec4..9fe37f7e8185 100644
--- a/include/linux/lightnvm.h
+++ b/include/linux/lightnvm.h
@@ -81,10 +81,13 @@ struct nvm_rq;
struct nvm_id;
struct nvm_dev;
struct nvm_tgt_dev;
+struct nvm_chk_meta;
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_chk_meta_fn)(struct nvm_dev *, struct nvm_chk_meta *,
+ sector_t, int);
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 *);
@@ -98,6 +101,8 @@ struct nvm_dev_ops {
nvm_op_bb_tbl_fn *get_bb_tbl;
nvm_op_set_bb_fn *set_bb_tbl;
+ nvm_get_chk_meta_fn *get_chk_meta;
+
nvm_submit_io_fn *submit_io;
nvm_submit_io_sync_fn *submit_io_sync;
@@ -227,6 +232,20 @@ struct nvm_addr_format {
u64 rsv_mask[2];
};
+/*
+ * Note: The structure size is linked to nvme_nvm_chk_meta such that the same
+ * buffer can be used when converting from little endian to cpu addressing.
+ */
+struct nvm_chk_meta {
+ u8 state;
+ u8 type;
+ u8 wi;
+ u8 rsvd[5];
+ u64 slba;
+ u64 cnlb;
+ u64 wp;
+};
+
struct nvm_target {
struct list_head list;
struct nvm_tgt_dev *dev;
@@ -496,6 +515,11 @@ 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_meta(struct nvm_tgt_dev *tgt_dev,
+ struct nvm_chk_meta *meta, struct ppa_addr ppa,
+ int nchks);
+
extern int nvm_set_tgt_bb_tbl(struct nvm_tgt_dev *, struct ppa_addr *,
int, int);
extern int nvm_submit_io(struct nvm_tgt_dev *, struct nvm_rq *);
--
2.7.4
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