This adds support for Directives in NVMe, particular for the Streams
directive. Support for Directives is a new feature in NVMe 1.3. It
allows a user to pass in information about where to store the data,
so that it the device can do so most effiently. If an application is
managing and writing data with different life times, mixing differently
retentioned data onto the same locations on flash can cause write
amplification to grow. This, in turn, will reduce performance and
life time of the device.
We default to allocating 4 streams per name space, but it is
configurable with the 'streams_per_ns' module option. If a write stream
is set in a write, flag is as such before sending it to the device.
Some debug stuff in this patch, dumping streams ID params when
we load nvme.
Signed-off-by: Jens Axboe <ax...@kernel.dk>
---
drivers/nvme/host/core.c | 124 +++++++++++++++++++++++++++++++++++++++++++++++
drivers/nvme/host/nvme.h | 1 +
include/linux/nvme.h | 48 ++++++++++++++++++
3 files changed, 173 insertions(+)
diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 903d5813023a..d7cbd050ddf4 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -65,6 +65,10 @@ static bool force_apst;
module_param(force_apst, bool, 0644);
MODULE_PARM_DESC(force_apst, "allow APST for newly enumerated devices even if
quirked off");
+static char streams_per_ns = 4;
+module_param(streams_per_ns, byte, 0644);
+MODULE_PARM_DESC(streams_per_ns, "if available, allocate this many streams per
NS");
+
static LIST_HEAD(nvme_ctrl_list);
static DEFINE_SPINLOCK(dev_list_lock);
@@ -351,6 +355,15 @@ static inline void nvme_setup_rw(struct nvme_ns *ns,
struct request *req,
cmnd->rw.slba = cpu_to_le64(nvme_block_nr(ns, blk_rq_pos(req)));
cmnd->rw.length = cpu_to_le16((blk_rq_bytes(req) >> ns->lba_shift) - 1);
+ if (req_op(req) == REQ_OP_WRITE) {
+ if (bio_stream_valid(req->bio) && ns->nr_streams) {
+ unsigned stream = bio_stream(req->bio) & 0xffff;
+
+ control |= NVME_RW_DTYPE_STREAMS;
+ dsmgmt |= ((stream % (ns->nr_streams + 1)) << 16);
+ }
+ }
+
if (ns->ms) {
switch (ns->pi_type) {
case NVME_NS_DPS_PI_TYPE3:
@@ -1073,6 +1086,109 @@ static int nvme_revalidate_disk(struct gendisk *disk)
return 0;
}
+static int nvme_enable_streams(struct nvme_ns *ns)
+{
+ struct nvme_command c;
+
+ memset(&c, 0, sizeof(c));
+
+ c.directive.opcode = nvme_admin_directive_send;
+ c.directive.nsid = cpu_to_le32(ns->ns_id);
+ c.directive.doper = NVME_DIR_SND_ID_OP_ENABLE;
+ c.directive.dtype = NVME_DIR_IDENTIFY;
+ c.directive.tdtype = NVME_DIR_STREAMS;
+ c.directive.endir = NVME_DIR_ENDIR;
+
+ return nvme_submit_sync_cmd(ns->ctrl->admin_q, &c, NULL, 0);
+}
+
+static int nvme_streams_params(struct nvme_ns *ns)
+{
+ struct nvme_ctrl *ctrl = ns->ctrl;
+ struct streams_directive_params s;
+ struct nvme_command c;
+ int ret;
+
+ memset(&c, 0, sizeof(c));
+ memset(&s, 0, sizeof(s));
+
+ c.directive.opcode = nvme_admin_directive_recv;
+ c.directive.nsid = cpu_to_le32(ns->ns_id);
+ c.directive.numd = sizeof(s);
+ c.directive.doper = NVME_DIR_RCV_ST_OP_PARAM;
+ c.directive.dtype = NVME_DIR_STREAMS;
+
+ ret = nvme_submit_sync_cmd(ctrl->admin_q, &c, &s, sizeof(s));
+ if (ret)
+ return ret;
+
+ s.msl = le16_to_cpu(s.msl);
+ s.nssa = le16_to_cpu(s.nssa);
+ s.nsso = le16_to_cpu(s.nsso);
+ s.sws = le32_to_cpu(s.sws);
+ s.sgs = le16_to_cpu(s.sgs);
+ s.nsa = le16_to_cpu(s.nsa);
+ s.nso = le16_to_cpu(s.nso);
+
+ dev_info(ctrl->device, "streams: msl=%u, nssa=%u, nsso=%u, sws=%u "
+ "sgs=%u, nsa=%u, nso=%u\n", s.msl, s.nssa,
+ s.nsso, s.sws, s.sgs, s.nsa, s.nso);
+ return 0;
+}
+
+static int nvme_streams_allocate(struct nvme_ns *ns, unsigned int streams)
+{
+ struct nvme_command c;
+
+ memset(&c, 0, sizeof(c));
+
+ c.directive.opcode = nvme_admin_directive_recv;
+ c.directive.nsid = cpu_to_le32(ns->ns_id);
+ c.directive.doper = NVME_DIR_RCV_ST_OP_RESOURCE;
+ c.directive.dtype = NVME_DIR_STREAMS;
+ c.directive.endir = streams;
+
+ return nvme_submit_sync_cmd(ns->ctrl->admin_q, &c, NULL, 0);
+}
+
+static int nvme_streams_deallocate(struct nvme_ns *ns)
+{
+ struct nvme_command c;
+
+ memset(&c, 0, sizeof(c));
+
+ c.directive.opcode = nvme_admin_directive_send;
+ c.directive.nsid = cpu_to_le32(ns->ns_id);
+ c.directive.doper = NVME_DIR_SND_ST_OP_REL_RSC;
+ c.directive.dtype = NVME_DIR_STREAMS;
+
+ return nvme_submit_sync_cmd(ns->ctrl->admin_q, &c, NULL, 0);
+}
+
+static void nvme_config_streams(struct nvme_ns *ns)
+{
+ int ret;
+
+ ret = nvme_enable_streams(ns);
+ if (ret)
+ return;
+
+ ret = nvme_streams_params(ns);
+ if (ret)
+ return;
+
+ ret = nvme_streams_allocate(ns, streams_per_ns);
+ if (ret)
+ return;
+
+ ret = nvme_streams_params(ns);
+ if (ret)
+ return;
+
+ ns->nr_streams = streams_per_ns;
+ dev_info(ns->ctrl->device, "successfully enabled streams\n");
+}
+
static char nvme_pr_type(enum pr_type type)
{
switch (type) {
@@ -1606,6 +1722,9 @@ int nvme_init_identify(struct nvme_ctrl *ctrl)
ctrl->sgls = le32_to_cpu(id->sgls);
ctrl->kas = le16_to_cpu(id->kas);
+ if (ctrl->oacs & NVME_CTRL_OACS_DIRECTIVES)
+ dev_info(ctrl->dev, "supports directives\n");
+
ctrl->npss = id->npss;
prev_apsta = ctrl->apsta;
if (ctrl->quirks & NVME_QUIRK_NO_APST) {
@@ -2060,6 +2179,9 @@ static void nvme_alloc_ns(struct nvme_ctrl *ctrl,
unsigned nsid)
goto out_free_id;
}
+ if (ctrl->oacs & NVME_CTRL_OACS_DIRECTIVES)
+ nvme_config_streams(ns);
+
disk = alloc_disk_node(0, node);
if (!disk)
goto out_free_id;
@@ -2112,6 +2234,8 @@ static void nvme_ns_remove(struct nvme_ns *ns)
&nvme_ns_attr_group);
if (ns->ndev)
nvme_nvm_unregister_sysfs(ns);
+ if (ns->nr_streams)
+ nvme_streams_deallocate(ns);
del_gendisk(ns->disk);
blk_cleanup_queue(ns->queue);
}
diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h
index 9d6a070d4391..dc87c8284259 100644
--- a/drivers/nvme/host/nvme.h
+++ b/drivers/nvme/host/nvme.h
@@ -192,6 +192,7 @@ struct nvme_ns {
u8 uuid[16];
unsigned ns_id;
+ unsigned nr_streams;
int lba_shift;
u16 ms;
bool ext;
diff --git a/include/linux/nvme.h b/include/linux/nvme.h
index b625bacf37ef..8b2f5b140134 100644
--- a/include/linux/nvme.h
+++ b/include/linux/nvme.h
@@ -245,6 +245,7 @@ enum {
NVME_CTRL_ONCS_WRITE_ZEROES = 1 << 3,
NVME_CTRL_VWC_PRESENT = 1 << 0,
NVME_CTRL_OACS_SEC_SUPP = 1 << 0,
+ NVME_CTRL_OACS_DIRECTIVES = 1 << 5,
NVME_CTRL_OACS_DBBUF_SUPP = 1 << 7,
};
@@ -295,6 +296,19 @@ enum {
};
enum {
+ NVME_DIR_IDENTIFY = 0x00,
+ NVME_DIR_STREAMS = 0x01,
+ NVME_DIR_SND_ID_OP_ENABLE = 0x01,
+ NVME_DIR_SND_ST_OP_REL_ID = 0x01,
+ NVME_DIR_SND_ST_OP_REL_RSC = 0x02,
+ NVME_DIR_RCV_ID_OP_PARAM = 0x01,
+ NVME_DIR_RCV_ST_OP_PARAM = 0x01,
+ NVME_DIR_RCV_ST_OP_STATUS = 0x02,
+ NVME_DIR_RCV_ST_OP_RESOURCE = 0x03,
+ NVME_DIR_ENDIR = 0x01,
+};
+
+enum {
NVME_NS_FEAT_THIN = 1 << 0,
NVME_NS_FLBAS_LBA_MASK = 0xf,
NVME_NS_FLBAS_META_EXT = 0x10,
@@ -535,6 +549,7 @@ enum {
NVME_RW_PRINFO_PRCHK_APP = 1 << 11,
NVME_RW_PRINFO_PRCHK_GUARD = 1 << 12,
NVME_RW_PRINFO_PRACT = 1 << 13,
+ NVME_RW_DTYPE_STREAMS = 1 << 4,
};
struct nvme_dsm_cmd {
@@ -604,6 +619,8 @@ enum nvme_admin_opcode {
nvme_admin_download_fw = 0x11,
nvme_admin_ns_attach = 0x15,
nvme_admin_keep_alive = 0x18,
+ nvme_admin_directive_send = 0x19,
+ nvme_admin_directive_recv = 0x1a,
nvme_admin_dbbuf = 0x7C,
nvme_admin_format_nvm = 0x80,
nvme_admin_security_send = 0x81,
@@ -756,6 +773,24 @@ struct nvme_get_log_page_command {
__u32 rsvd14[2];
};
+struct nvme_directive_cmd {
+ __u8 opcode;
+ __u8 flags;
+ __u16 command_id;
+ __le32 nsid;
+ __u64 rsvd2[2];
+ union nvme_data_ptr dptr;
+ __le32 numd;
+ __u8 doper;
+ __u8 dtype;
+ __le16 dspec;
+ __u8 endir;
+ __u8 tdtype;
+ __u16 rsvd15;
+
+ __u32 rsvd16[3];
+};
+
/*
* Fabrics subcommands.
*/
@@ -886,6 +921,18 @@ struct nvme_dbbuf {
__u32 rsvd12[6];
};
+struct streams_directive_params {
+ __u16 msl;
+ __u16 nssa;
+ __u16 nsso;
+ __u8 rsvd[10];
+ __u32 sws;
+ __u16 sgs;
+ __u16 nsa;
+ __u16 nso;
+ __u8 rsvd2[6];
+};
+
struct nvme_command {
union {
struct nvme_common_command common;
@@ -906,6 +953,7 @@ struct nvme_command {
struct nvmf_property_set_command prop_set;
struct nvmf_property_get_command prop_get;
struct nvme_dbbuf dbbuf;
+ struct nvme_directive_cmd directive;
};
};
--
2.7.4
