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Subject[PATCH V2 3/4] lightnvm: add 2.0 geometry identification
Date
Implement the geometry data structures for 2.0 and enable a drive
to be identified as one, including exposing the appropriate 2.0
sysfs entries.

Signed-off-by: Matias Bjørling <mb@lightnvm.io>
---
drivers/lightnvm/core.c | 8 +-
drivers/nvme/host/lightnvm.c | 334 +++++++++++++++++++++++++++++++++++++------
include/linux/lightnvm.h | 11 +-
3 files changed, 297 insertions(+), 56 deletions(-)

diff --git a/drivers/lightnvm/core.c b/drivers/lightnvm/core.c
index c72863b36439..9b1255b3e05e 100644
--- a/drivers/lightnvm/core.c
+++ b/drivers/lightnvm/core.c
@@ -931,11 +931,9 @@ static int nvm_init(struct nvm_dev *dev)
goto err;
}

- pr_debug("nvm: ver:%x nvm_vendor:%x\n",
- dev->identity.ver_id, dev->identity.vmnt);
-
- if (dev->identity.ver_id != 1) {
- pr_err("nvm: device not supported by kernel.");
+ if (dev->identity.ver_id != 1 && dev->identity.ver_id != 2) {
+ pr_err("nvm: device ver_id %d not supported by kernel.\n",
+ dev->identity.ver_id);
goto err;
}

diff --git a/drivers/nvme/host/lightnvm.c b/drivers/nvme/host/lightnvm.c
index 6412551ecc65..8b243af8a949 100644
--- a/drivers/nvme/host/lightnvm.c
+++ b/drivers/nvme/host/lightnvm.c
@@ -184,6 +184,58 @@ struct nvme_nvm_bb_tbl {
__u8 blk[0];
};

+struct nvme_nvm_id20_addrf {
+ __u8 grp_len;
+ __u8 pu_len;
+ __u8 chk_len;
+ __u8 lba_len;
+ __u8 resv[4];
+};
+
+struct nvme_nvm_id20 {
+ __u8 mjr;
+ __u8 mnr;
+ __u8 resv[6];
+
+ struct nvme_nvm_id20_addrf lbaf;
+
+ __le32 mccap;
+ __u8 resv2[12];
+
+ __u8 wit;
+ __u8 resv3[31];
+
+ /* Geometry */
+ __le16 num_grp;
+ __le16 num_pu;
+ __le32 num_chk;
+ __le32 clba;
+ __u8 resv4[52];
+
+ /* Write data requirements */
+ __le32 ws_min;
+ __le32 ws_opt;
+ __le32 mw_cunits;
+ __le32 maxoc;
+ __le32 maxocpu;
+ __u8 resv5[44];
+
+ /* Performance related metrics */
+ __le32 trdt;
+ __le32 trdm;
+ __le32 twrt;
+ __le32 twrm;
+ __le32 tcrst;
+ __le32 tcrsm;
+ __u8 resv6[40];
+
+ /* Reserved area */
+ __u8 resv7[2816];
+
+ /* Vendor specific */
+ __u8 vs[1024];
+};
+
/*
* Check we didn't inadvertently grow the command struct
*/
@@ -198,6 +250,8 @@ static inline void _nvme_nvm_check_size(void)
BUILD_BUG_ON(sizeof(struct nvme_nvm_id12_addrf) != 16);
BUILD_BUG_ON(sizeof(struct nvme_nvm_id12) != NVME_IDENTIFY_DATA_SIZE);
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);
}

static int init_grp(struct nvm_id *nvm_id, struct nvme_nvm_id12 *id12)
@@ -256,6 +310,49 @@ static int init_grp(struct nvm_id *nvm_id, struct nvme_nvm_id12 *id12)
return 0;
}

+static int nvme_nvm_setup_12(struct nvm_dev *nvmdev, struct nvm_id *nvm_id,
+ struct nvme_nvm_id12 *id)
+{
+ nvm_id->ver_id = id->ver_id;
+ nvm_id->vmnt = id->vmnt;
+ nvm_id->cap = le32_to_cpu(id->cap);
+ nvm_id->dom = le32_to_cpu(id->dom);
+ memcpy(&nvm_id->ppaf, &id->ppaf,
+ sizeof(struct nvm_addr_format));
+
+ return init_grp(nvm_id, id);
+}
+
+static int nvme_nvm_setup_20(struct nvm_dev *nvmdev, struct nvm_id *nvm_id,
+ struct nvme_nvm_id20 *id)
+{
+ nvm_id->ver_id = id->mjr;
+
+ nvm_id->num_ch = le16_to_cpu(id->num_grp);
+ nvm_id->num_lun = le16_to_cpu(id->num_pu);
+ nvm_id->num_chk = le32_to_cpu(id->num_chk);
+ nvm_id->clba = le32_to_cpu(id->clba);
+
+ nvm_id->ws_min = le32_to_cpu(id->ws_min);
+ nvm_id->ws_opt = le32_to_cpu(id->ws_opt);
+ nvm_id->mw_cunits = le32_to_cpu(id->mw_cunits);
+
+ nvm_id->trdt = le32_to_cpu(id->trdt);
+ nvm_id->trdm = le32_to_cpu(id->trdm);
+ nvm_id->tprt = le32_to_cpu(id->twrt);
+ nvm_id->tprm = le32_to_cpu(id->twrm);
+ nvm_id->tbet = le32_to_cpu(id->tcrst);
+ nvm_id->tbem = le32_to_cpu(id->tcrsm);
+
+ /* calculated values */
+ nvm_id->ws_per_chk = nvm_id->clba / nvm_id->ws_min;
+
+ /* 1.2 compatibility */
+ nvm_id->ws_seq = NVM_IO_SNGL_ACCESS;
+
+ return 0;
+}
+
static int nvme_nvm_identity(struct nvm_dev *nvmdev, struct nvm_id *nvm_id)
{
struct nvme_ns *ns = nvmdev->q->queuedata;
@@ -277,14 +374,24 @@ static int nvme_nvm_identity(struct nvm_dev *nvmdev, struct nvm_id *nvm_id)
goto out;
}

- nvm_id->ver_id = id->ver_id;
- nvm_id->vmnt = id->vmnt;
- nvm_id->cap = le32_to_cpu(id->cap);
- nvm_id->dom = le32_to_cpu(id->dom);
- memcpy(&nvm_id->ppaf, &id->ppaf,
- sizeof(struct nvm_addr_format));
-
- ret = init_grp(nvm_id, id);
+ /*
+ * The 1.2 and 2.0 specifications share the first byte in their geometry
+ * command to make it possible to know what version a device implements.
+ */
+ switch (id->ver_id) {
+ case 1:
+ ret = nvme_nvm_setup_12(nvmdev, nvm_id, id);
+ break;
+ case 2:
+ ret = nvme_nvm_setup_20(nvmdev, nvm_id,
+ (struct nvme_nvm_id20 *)id);
+ break;
+ default:
+ dev_err(ns->ctrl->device,
+ "OCSSD revision not supported (%d)\n",
+ nvm_id->ver_id);
+ ret = -EINVAL;
+ }
out:
kfree(id);
return ret;
@@ -733,7 +840,7 @@ void nvme_nvm_unregister(struct nvme_ns *ns)
}

static ssize_t nvm_dev_attr_show(struct device *dev,
- struct device_attribute *dattr, char *page)
+ struct device_attribute *dattr, char *page)
{
struct nvme_ns *ns = nvme_get_ns_from_dev(dev);
struct nvm_dev *ndev = ns->ndev;
@@ -748,10 +855,36 @@ static ssize_t nvm_dev_attr_show(struct device *dev,

if (strcmp(attr->name, "version") == 0) {
return scnprintf(page, PAGE_SIZE, "%u\n", id->ver_id);
- } else if (strcmp(attr->name, "vendor_opcode") == 0) {
- return scnprintf(page, PAGE_SIZE, "%u\n", id->vmnt);
} else if (strcmp(attr->name, "capabilities") == 0) {
return scnprintf(page, PAGE_SIZE, "%u\n", id->cap);
+ } else if (strcmp(attr->name, "read_typ") == 0) {
+ return scnprintf(page, PAGE_SIZE, "%u\n", id->trdt);
+ } else if (strcmp(attr->name, "read_max") == 0) {
+ return scnprintf(page, PAGE_SIZE, "%u\n", id->trdm);
+ } else {
+ return scnprintf(page,
+ PAGE_SIZE,
+ "Unhandled attr(%s) in `nvm_dev_attr_show`\n",
+ attr->name);
+ }
+}
+
+static ssize_t nvm_dev_attr_show_12(struct device *dev,
+ struct device_attribute *dattr, char *page)
+{
+ struct nvme_ns *ns = nvme_get_ns_from_dev(dev);
+ struct nvm_dev *ndev = ns->ndev;
+ struct nvm_id *id;
+ struct attribute *attr;
+
+ if (!ndev)
+ return 0;
+
+ id = &ndev->identity;
+ attr = &dattr->attr;
+
+ if (strcmp(attr->name, "vendor_opcode") == 0) {
+ return scnprintf(page, PAGE_SIZE, "%u\n", id->vmnt);
} else if (strcmp(attr->name, "device_mode") == 0) {
return scnprintf(page, PAGE_SIZE, "%u\n", id->dom);
/* kept for compatibility */
@@ -786,10 +919,6 @@ static ssize_t nvm_dev_attr_show(struct device *dev,
return scnprintf(page, PAGE_SIZE, "%u\n", id->csecs);
} else if (strcmp(attr->name, "oob_sector_size") == 0) {/* u32 */
return scnprintf(page, PAGE_SIZE, "%u\n", id->sos);
- } else if (strcmp(attr->name, "read_typ") == 0) {
- return scnprintf(page, PAGE_SIZE, "%u\n", id->trdt);
- } else if (strcmp(attr->name, "read_max") == 0) {
- return scnprintf(page, PAGE_SIZE, "%u\n", id->trdm);
} else if (strcmp(attr->name, "prog_typ") == 0) {
return scnprintf(page, PAGE_SIZE, "%u\n", id->tprt);
} else if (strcmp(attr->name, "prog_max") == 0) {
@@ -808,48 +937,99 @@ static ssize_t nvm_dev_attr_show(struct device *dev,
} else {
return scnprintf(page,
PAGE_SIZE,
- "Unhandled attr(%s) in `nvm_dev_attr_show`\n",
+ "Unhandled attr(%s) in `nvm_dev_attr_show_12`\n",
attr->name);
}
}

-#define NVM_DEV_ATTR_RO(_name) \
+static ssize_t nvm_dev_attr_show_20(struct device *dev,
+ struct device_attribute *dattr, char *page)
+{
+ struct nvme_ns *ns = nvme_get_ns_from_dev(dev);
+ struct nvm_dev *ndev = ns->ndev;
+ struct nvm_id *id;
+ struct attribute *attr;
+
+ if (!ndev)
+ return 0;
+
+ id = &ndev->identity;
+ attr = &dattr->attr;
+
+ if (strcmp(attr->name, "groups") == 0) {
+ return scnprintf(page, PAGE_SIZE, "%u\n", id->num_ch);
+ } else if (strcmp(attr->name, "punits") == 0) {
+ return scnprintf(page, PAGE_SIZE, "%u\n", id->num_lun);
+ } else if (strcmp(attr->name, "chunks") == 0) {
+ return scnprintf(page, PAGE_SIZE, "%u\n", id->num_chk);
+ } else if (strcmp(attr->name, "clba") == 0) {
+ return scnprintf(page, PAGE_SIZE, "%u\n", id->clba);
+ } else if (strcmp(attr->name, "ws_min") == 0) {
+ return scnprintf(page, PAGE_SIZE, "%u\n", id->ws_min);
+ } else if (strcmp(attr->name, "ws_opt") == 0) {
+ return scnprintf(page, PAGE_SIZE, "%u\n", id->ws_opt);
+ } else if (strcmp(attr->name, "mw_cunits") == 0) {
+ return scnprintf(page, PAGE_SIZE, "%u\n", id->mw_cunits);
+ } else if (strcmp(attr->name, "write_typ") == 0) {
+ return scnprintf(page, PAGE_SIZE, "%u\n", id->tprt);
+ } else if (strcmp(attr->name, "write_max") == 0) {
+ return scnprintf(page, PAGE_SIZE, "%u\n", id->tprm);
+ } else if (strcmp(attr->name, "reset_typ") == 0) {
+ return scnprintf(page, PAGE_SIZE, "%u\n", id->tbet);
+ } else if (strcmp(attr->name, "reset_max") == 0) {
+ return scnprintf(page, PAGE_SIZE, "%u\n", id->tbem);
+ } else {
+ return scnprintf(page,
+ PAGE_SIZE,
+ "Unhandled attr(%s) in `nvm_dev_attr_show_20`\n",
+ attr->name);
+ }
+}
+
+#define NVM_DEV_ATTR_RO(_name) \
DEVICE_ATTR(_name, S_IRUGO, nvm_dev_attr_show, NULL)
+#define NVM_DEV_ATTR_12_RO(_name) \
+ DEVICE_ATTR(_name, S_IRUGO, nvm_dev_attr_show_12, NULL)
+#define NVM_DEV_ATTR_20_RO(_name) \
+ DEVICE_ATTR(_name, S_IRUGO, nvm_dev_attr_show_20, NULL)

+/* general attributes */
static NVM_DEV_ATTR_RO(version);
-static NVM_DEV_ATTR_RO(vendor_opcode);
static NVM_DEV_ATTR_RO(capabilities);
-static NVM_DEV_ATTR_RO(device_mode);
-static NVM_DEV_ATTR_RO(ppa_format);
-static NVM_DEV_ATTR_RO(media_manager);

-static NVM_DEV_ATTR_RO(media_type);
-static NVM_DEV_ATTR_RO(flash_media_type);
-static NVM_DEV_ATTR_RO(num_channels);
-static NVM_DEV_ATTR_RO(num_luns);
-static NVM_DEV_ATTR_RO(num_planes);
-static NVM_DEV_ATTR_RO(num_blocks);
-static NVM_DEV_ATTR_RO(num_pages);
-static NVM_DEV_ATTR_RO(page_size);
-static NVM_DEV_ATTR_RO(hw_sector_size);
-static NVM_DEV_ATTR_RO(oob_sector_size);
static NVM_DEV_ATTR_RO(read_typ);
static NVM_DEV_ATTR_RO(read_max);
-static NVM_DEV_ATTR_RO(prog_typ);
-static NVM_DEV_ATTR_RO(prog_max);
-static NVM_DEV_ATTR_RO(erase_typ);
-static NVM_DEV_ATTR_RO(erase_max);
-static NVM_DEV_ATTR_RO(multiplane_modes);
-static NVM_DEV_ATTR_RO(media_capabilities);
-static NVM_DEV_ATTR_RO(max_phys_secs);

-static struct attribute *nvm_dev_attrs[] = {
+/* 1.2 values */
+static NVM_DEV_ATTR_12_RO(vendor_opcode);
+static NVM_DEV_ATTR_12_RO(device_mode);
+static NVM_DEV_ATTR_12_RO(ppa_format);
+static NVM_DEV_ATTR_12_RO(media_manager);
+static NVM_DEV_ATTR_12_RO(media_type);
+static NVM_DEV_ATTR_12_RO(flash_media_type);
+static NVM_DEV_ATTR_12_RO(num_channels);
+static NVM_DEV_ATTR_12_RO(num_luns);
+static NVM_DEV_ATTR_12_RO(num_planes);
+static NVM_DEV_ATTR_12_RO(num_blocks);
+static NVM_DEV_ATTR_12_RO(num_pages);
+static NVM_DEV_ATTR_12_RO(page_size);
+static NVM_DEV_ATTR_12_RO(hw_sector_size);
+static NVM_DEV_ATTR_12_RO(oob_sector_size);
+static NVM_DEV_ATTR_12_RO(prog_typ);
+static NVM_DEV_ATTR_12_RO(prog_max);
+static NVM_DEV_ATTR_12_RO(erase_typ);
+static NVM_DEV_ATTR_12_RO(erase_max);
+static NVM_DEV_ATTR_12_RO(multiplane_modes);
+static NVM_DEV_ATTR_12_RO(media_capabilities);
+static NVM_DEV_ATTR_12_RO(max_phys_secs);
+
+static struct attribute *nvm_dev_attrs_12[] = {
&dev_attr_version.attr,
+ &dev_attr_capabilities.attr,
+
&dev_attr_vendor_opcode.attr,
- &dev_attr_capabilities.attr,
&dev_attr_device_mode.attr,
&dev_attr_media_manager.attr,
-
&dev_attr_ppa_format.attr,
&dev_attr_media_type.attr,
&dev_attr_flash_media_type.attr,
@@ -870,22 +1050,82 @@ static struct attribute *nvm_dev_attrs[] = {
&dev_attr_multiplane_modes.attr,
&dev_attr_media_capabilities.attr,
&dev_attr_max_phys_secs.attr,
+
+ NULL,
+};
+
+static const struct attribute_group nvm_dev_attr_group_12 = {
+ .name = "lightnvm",
+ .attrs = nvm_dev_attrs_12,
+};
+
+/* 2.0 values */
+static NVM_DEV_ATTR_20_RO(groups);
+static NVM_DEV_ATTR_20_RO(punits);
+static NVM_DEV_ATTR_20_RO(chunks);
+static NVM_DEV_ATTR_20_RO(clba);
+static NVM_DEV_ATTR_20_RO(ws_min);
+static NVM_DEV_ATTR_20_RO(ws_opt);
+static NVM_DEV_ATTR_20_RO(mw_cunits);
+static NVM_DEV_ATTR_20_RO(write_typ);
+static NVM_DEV_ATTR_20_RO(write_max);
+static NVM_DEV_ATTR_20_RO(reset_typ);
+static NVM_DEV_ATTR_20_RO(reset_max);
+
+static struct attribute *nvm_dev_attrs_20[] = {
+ &dev_attr_version.attr,
+ &dev_attr_capabilities.attr,
+
+ &dev_attr_groups.attr,
+ &dev_attr_punits.attr,
+ &dev_attr_chunks.attr,
+ &dev_attr_clba.attr,
+ &dev_attr_ws_min.attr,
+ &dev_attr_ws_opt.attr,
+ &dev_attr_mw_cunits.attr,
+
+ &dev_attr_read_typ.attr,
+ &dev_attr_read_max.attr,
+ &dev_attr_write_typ.attr,
+ &dev_attr_write_max.attr,
+ &dev_attr_reset_typ.attr,
+ &dev_attr_reset_max.attr,
+
NULL,
};

-static const struct attribute_group nvm_dev_attr_group = {
+static const struct attribute_group nvm_dev_attr_group_20 = {
.name = "lightnvm",
- .attrs = nvm_dev_attrs,
+ .attrs = nvm_dev_attrs_20,
};

int nvme_nvm_register_sysfs(struct nvme_ns *ns)
{
- return sysfs_create_group(&disk_to_dev(ns->disk)->kobj,
- &nvm_dev_attr_group);
+ if (!ns->ndev)
+ return -EINVAL;
+
+ switch (ns->ndev->identity.ver_id) {
+ case 1:
+ return sysfs_create_group(&disk_to_dev(ns->disk)->kobj,
+ &nvm_dev_attr_group_12);
+ case 2:
+ return sysfs_create_group(&disk_to_dev(ns->disk)->kobj,
+ &nvm_dev_attr_group_20);
+ }
+
+ return -EINVAL;
}

void nvme_nvm_unregister_sysfs(struct nvme_ns *ns)
{
- sysfs_remove_group(&disk_to_dev(ns->disk)->kobj,
- &nvm_dev_attr_group);
+ switch (ns->ndev->identity.ver_id) {
+ case 1:
+ sysfs_remove_group(&disk_to_dev(ns->disk)->kobj,
+ &nvm_dev_attr_group_12);
+ break;
+ case 2:
+ sysfs_remove_group(&disk_to_dev(ns->disk)->kobj,
+ &nvm_dev_attr_group_20);
+ break;
+ }
}
diff --git a/include/linux/lightnvm.h b/include/linux/lightnvm.h
index 94b704a8d83d..b717c000b712 100644
--- a/include/linux/lightnvm.h
+++ b/include/linux/lightnvm.h
@@ -184,10 +184,9 @@ struct nvm_id {
u16 csecs;
u16 sos;

- u16 ws_min;
- u16 ws_opt;
- u16 ws_seq;
- u16 ws_per_chk;
+ u32 ws_min;
+ u32 ws_opt;
+ u32 mw_cunits;

u32 trdt;
u32 trdm;
@@ -199,6 +198,10 @@ struct nvm_id {
u32 mccap;
u16 cpar;

+ /* calculated values */
+ u16 ws_seq;
+ u16 ws_per_chk;
+
/* 1.2 compatibility */
u8 mtype;
u8 fmtype;
--
2.11.0
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