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[PATCH v2 11/18] hw/block/nvme: Introduce max active and open zone limit
From: |
Dmitry Fomichev |
Subject: |
[PATCH v2 11/18] hw/block/nvme: Introduce max active and open zone limits |
Date: |
Thu, 18 Jun 2020 06:34:08 +0900 |
Added two module properties, "max_active" and "max_open" to control
the maximum number of zones that can be active or open. Once these
variables are set to non-default values, the driver checks these
limits during I/O and returns Too Many Active or Too Many Open
command status if they are exceeded.
Signed-off-by: Hans Holmberg <hans.holmberg@wdc.com>
Signed-off-by: Dmitry Fomichev <dmitry.fomichev@wdc.com>
---
hw/block/nvme.c | 183 +++++++++++++++++++++++++++++++++++++++++++++++-
hw/block/nvme.h | 4 ++
2 files changed, 185 insertions(+), 2 deletions(-)
diff --git a/hw/block/nvme.c b/hw/block/nvme.c
index 2e03b0b6ed..05a7cbcfcc 100644
--- a/hw/block/nvme.c
+++ b/hw/block/nvme.c
@@ -120,6 +120,87 @@ static void nvme_remove_zone(NvmeCtrl *n, NvmeNamespace
*ns, NvmeZoneList *zl,
zone->prev = zone->next = 0;
}
+/*
+ * Take the first zone out from a list, return NULL if the list is empty.
+ */
+static NvmeZone *nvme_remove_zone_head(NvmeCtrl *n, NvmeNamespace *ns,
+ NvmeZoneList *zl)
+{
+ NvmeZone *zone = nvme_peek_zone_head(ns, zl);
+
+ if (zone) {
+ --zl->size;
+ if (zl->size == 0) {
+ zl->head = NVME_ZONE_LIST_NIL;
+ zl->tail = NVME_ZONE_LIST_NIL;
+ } else {
+ zl->head = zone->next;
+ ns->zone_array[zl->head].prev = NVME_ZONE_LIST_NIL;
+ }
+ zone->prev = zone->next = 0;
+ }
+
+ return zone;
+}
+
+/*
+ * Check if we can open a zone without exceeding open/active limits.
+ * AOR stands for "Active and Open Resources" (see TP 4053 section 2.5).
+ */
+static int nvme_aor_check(NvmeCtrl *n, NvmeNamespace *ns,
+ uint32_t act, uint32_t opn)
+{
+ if (n->params.max_active_zones != 0 &&
+ ns->nr_active_zones + act > n->params.max_active_zones) {
+ trace_pci_nvme_err_insuff_active_res(n->params.max_active_zones);
+ return NVME_ZONE_TOO_MANY_ACTIVE | NVME_DNR;
+ }
+ if (n->params.max_open_zones != 0 &&
+ ns->nr_open_zones + opn > n->params.max_open_zones) {
+ trace_pci_nvme_err_insuff_open_res(n->params.max_open_zones);
+ return NVME_ZONE_TOO_MANY_OPEN | NVME_DNR;
+ }
+
+ return NVME_SUCCESS;
+}
+
+static inline void nvme_aor_inc_open(NvmeCtrl *n, NvmeNamespace *ns)
+{
+ assert(ns->nr_open_zones >= 0);
+ if (n->params.max_open_zones) {
+ ns->nr_open_zones++;
+ assert(ns->nr_open_zones <= n->params.max_open_zones);
+ }
+}
+
+static inline void nvme_aor_dec_open(NvmeCtrl *n, NvmeNamespace *ns)
+{
+ if (n->params.max_open_zones) {
+ assert(ns->nr_open_zones > 0);
+ ns->nr_open_zones--;
+ }
+ assert(ns->nr_open_zones >= 0);
+}
+
+static inline void nvme_aor_inc_active(NvmeCtrl *n, NvmeNamespace *ns)
+{
+ assert(ns->nr_active_zones >= 0);
+ if (n->params.max_active_zones) {
+ ns->nr_active_zones++;
+ assert(ns->nr_active_zones <= n->params.max_active_zones);
+ }
+}
+
+static inline void nvme_aor_dec_active(NvmeCtrl *n, NvmeNamespace *ns)
+{
+ if (n->params.max_active_zones) {
+ assert(ns->nr_active_zones > 0);
+ ns->nr_active_zones--;
+ assert(ns->nr_active_zones >= ns->nr_open_zones);
+ }
+ assert(ns->nr_active_zones >= 0);
+}
+
static void nvme_assign_zone_state(NvmeCtrl *n, NvmeNamespace *ns,
NvmeZone *zone, uint8_t state)
{
@@ -454,6 +535,24 @@ static void nvme_enqueue_req_completion(NvmeCQueue *cq,
NvmeRequest *req)
timer_mod(cq->timer, qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + 500);
}
+static void nvme_auto_transition_zone(NvmeCtrl *n, NvmeNamespace *ns,
+ bool implicit, bool adding_active)
+{
+ NvmeZone *zone;
+
+ if (implicit && n->params.max_open_zones &&
+ ns->nr_open_zones == n->params.max_open_zones) {
+ zone = nvme_remove_zone_head(n, ns, ns->imp_open_zones);
+ if (zone) {
+ /*
+ * Automatically close this implicitly open zone.
+ */
+ nvme_aor_dec_open(n, ns);
+ nvme_assign_zone_state(n, ns, zone, NVME_ZONE_STATE_CLOSED);
+ }
+ }
+}
+
static uint16_t nvme_check_zone_write(NvmeZone *zone, uint64_t slba,
uint32_t nlb)
{
@@ -531,6 +630,23 @@ static uint16_t nvme_check_zone_read(NvmeCtrl *n, NvmeZone
*zone, uint64_t slba,
return status;
}
+static uint16_t nvme_auto_open_zone(NvmeCtrl *n, NvmeNamespace *ns,
+ NvmeZone *zone)
+{
+ uint16_t status = NVME_SUCCESS;
+ uint8_t zs = nvme_get_zone_state(zone);
+
+ if (zs == NVME_ZONE_STATE_EMPTY) {
+ nvme_auto_transition_zone(n, ns, true, true);
+ status = nvme_aor_check(n, ns, 1, 1);
+ } else if (zs == NVME_ZONE_STATE_CLOSED) {
+ nvme_auto_transition_zone(n, ns, true, false);
+ status = nvme_aor_check(n, ns, 0, 1);
+ }
+
+ return status;
+}
+
static uint64_t nvme_finalize_zone_write(NvmeCtrl *n, NvmeNamespace *ns,
NvmeZone *zone, uint32_t nlb)
{
@@ -543,7 +659,11 @@ static uint64_t nvme_finalize_zone_write(NvmeCtrl *n,
NvmeNamespace *ns,
switch (zs) {
case NVME_ZONE_STATE_IMPLICITLY_OPEN:
case NVME_ZONE_STATE_EXPLICITLY_OPEN:
+ nvme_aor_dec_open(n, ns);
+ /* fall through */
case NVME_ZONE_STATE_CLOSED:
+ nvme_aor_dec_active(n, ns);
+ /* fall through */
case NVME_ZONE_STATE_EMPTY:
break;
default:
@@ -553,7 +673,10 @@ static uint64_t nvme_finalize_zone_write(NvmeCtrl *n,
NvmeNamespace *ns,
} else {
switch (zs) {
case NVME_ZONE_STATE_EMPTY:
+ nvme_aor_inc_active(n, ns);
+ /* fall through */
case NVME_ZONE_STATE_CLOSED:
+ nvme_aor_inc_open(n, ns);
nvme_assign_zone_state(n, ns, zone,
NVME_ZONE_STATE_IMPLICITLY_OPEN);
}
@@ -636,6 +759,11 @@ static uint16_t nvme_write_zeros(NvmeCtrl *n,
NvmeNamespace *ns, NvmeCmd *cmd,
zone->d.wp);
return NVME_ZONE_INVALID_WRITE | NVME_DNR;
}
+
+ status = nvme_auto_open_zone(n, ns, zone);
+ if (status != NVME_SUCCESS) {
+ return status;
+ }
}
block_acct_start(blk_get_stats(n->conf.blk), &req->acct, 0,
@@ -709,6 +837,11 @@ static uint16_t nvme_rw(NvmeCtrl *n, NvmeNamespace *ns,
NvmeCmd *cmd,
zone->d.wp);
return NVME_ZONE_INVALID_WRITE | NVME_DNR;
}
+
+ status = nvme_auto_open_zone(n, ns, zone);
+ if (status != NVME_SUCCESS) {
+ return status;
+ }
} else {
status = nvme_check_zone_read(n, zone, slba, nlb,
n->params.cross_zone_read);
@@ -804,9 +937,27 @@ static uint16_t nvme_get_mgmt_zone_slba_idx(NvmeCtrl *n,
NvmeNamespace *ns,
static uint16_t nvme_open_zone(NvmeCtrl *n, NvmeNamespace *ns,
NvmeZone *zone, uint8_t state)
{
+ uint16_t status;
+
switch (state) {
case NVME_ZONE_STATE_EMPTY:
+ nvme_auto_transition_zone(n, ns, false, true);
+ status = nvme_aor_check(n, ns, 1, 0);
+ if (status != NVME_SUCCESS) {
+ return status;
+ }
+ nvme_aor_inc_active(n, ns);
+ /* fall through */
case NVME_ZONE_STATE_CLOSED:
+ status = nvme_aor_check(n, ns, 0, 1);
+ if (status != NVME_SUCCESS) {
+ if (state == NVME_ZONE_STATE_EMPTY) {
+ nvme_aor_dec_active(n, ns);
+ }
+ return status;
+ }
+ nvme_aor_inc_open(n, ns);
+ /* fall through */
case NVME_ZONE_STATE_IMPLICITLY_OPEN:
nvme_assign_zone_state(n, ns, zone, NVME_ZONE_STATE_EXPLICITLY_OPEN);
/* fall through */
@@ -828,6 +979,7 @@ static uint16_t nvme_close_zone(NvmeCtrl *n, NvmeNamespace
*ns,
switch (state) {
case NVME_ZONE_STATE_EXPLICITLY_OPEN:
case NVME_ZONE_STATE_IMPLICITLY_OPEN:
+ nvme_aor_dec_open(n, ns);
nvme_assign_zone_state(n, ns, zone, NVME_ZONE_STATE_CLOSED);
/* fall through */
case NVME_ZONE_STATE_CLOSED:
@@ -849,7 +1001,11 @@ static uint16_t nvme_finish_zone(NvmeCtrl *n,
NvmeNamespace *ns,
switch (state) {
case NVME_ZONE_STATE_EXPLICITLY_OPEN:
case NVME_ZONE_STATE_IMPLICITLY_OPEN:
+ nvme_aor_dec_open(n, ns);
+ /* fall through */
case NVME_ZONE_STATE_CLOSED:
+ nvme_aor_dec_active(n, ns);
+ /* fall through */
case NVME_ZONE_STATE_EMPTY:
zone->d.wp = nvme_zone_wr_boundary(zone);
nvme_assign_zone_state(n, ns, zone, NVME_ZONE_STATE_FULL);
@@ -874,7 +1030,11 @@ static uint16_t nvme_reset_zone(NvmeCtrl *n,
NvmeNamespace *ns,
switch (state) {
case NVME_ZONE_STATE_EXPLICITLY_OPEN:
case NVME_ZONE_STATE_IMPLICITLY_OPEN:
+ nvme_aor_dec_open(n, ns);
+ /* fall through */
case NVME_ZONE_STATE_CLOSED:
+ nvme_aor_dec_active(n, ns);
+ /* fall through */
case NVME_ZONE_STATE_FULL:
zone->d.wp = zone->d.zslba;
nvme_assign_zone_state(n, ns, zone, NVME_ZONE_STATE_EMPTY);
@@ -2412,6 +2572,15 @@ static void nvme_zoned_init_ctrl(NvmeCtrl *n, Error
**errp)
uint64_t zone_size = 0, capacity;
uint32_t nz;
+ if (n->params.max_open_zones < 0) {
+ error_setg(errp, "invalid max_open_zones value");
+ return;
+ }
+ if (n->params.max_active_zones < 0) {
+ error_setg(errp, "invalid max_active_zones value");
+ return;
+ }
+
if (n->params.zone_size) {
zone_size = n->params.zone_size;
} else {
@@ -2435,6 +2604,14 @@ static void nvme_zoned_init_ctrl(NvmeCtrl *n, Error
**errp)
n->num_zones = nz;
n->zone_array_size = sizeof(NvmeZone) * nz;
+ /* Make sure that the values of all Zoned Command Set properties are sane
*/
+ if (n->params.max_open_zones > nz) {
+ n->params.max_open_zones = nz;
+ }
+ if (n->params.max_active_zones > nz) {
+ n->params.max_active_zones = nz;
+ }
+
return;
}
@@ -2452,8 +2629,8 @@ static int nvme_zoned_init_ns(NvmeCtrl *n, NvmeNamespace
*ns, int lba_index,
ns->id_ns_zoned = g_malloc0(sizeof(*ns->id_ns_zoned));
/* MAR/MOR are zeroes-based, 0xffffffff means no limit */
- ns->id_ns_zoned->mar = 0xffffffff;
- ns->id_ns_zoned->mor = 0xffffffff;
+ ns->id_ns_zoned->mar = cpu_to_le32(n->params.max_active_zones - 1);
+ ns->id_ns_zoned->mor = cpu_to_le32(n->params.max_open_zones - 1);
ns->id_ns_zoned->zoc = 0;
ns->id_ns_zoned->ozcs = n->params.cross_zone_read ? 0x01 : 0x00;
@@ -2813,6 +2990,8 @@ static Property nvme_props[] = {
DEFINE_PROP_UINT64("zone_size", NvmeCtrl, params.zone_size, 512),
DEFINE_PROP_UINT64("zone_capacity", NvmeCtrl, params.zone_capacity, 512),
DEFINE_PROP_UINT32("zone_append_max_size", NvmeCtrl, params.zamds_bs, 0),
+ DEFINE_PROP_INT32("max_active", NvmeCtrl, params.max_active_zones, 0),
+ DEFINE_PROP_INT32("max_open", NvmeCtrl, params.max_open_zones, 0),
DEFINE_PROP_BOOL("cross_zone_read", NvmeCtrl, params.cross_zone_read,
true),
DEFINE_PROP_UINT8("fill_pattern", NvmeCtrl, params.fill_pattern, 0),
DEFINE_PROP_END_OF_LIST(),
diff --git a/hw/block/nvme.h b/hw/block/nvme.h
index 2c932b5e29..f5a4679702 100644
--- a/hw/block/nvme.h
+++ b/hw/block/nvme.h
@@ -19,6 +19,8 @@ typedef struct NvmeParams {
uint32_t zamds_bs;
uint64_t zone_size;
uint64_t zone_capacity;
+ int32_t max_active_zones;
+ int32_t max_open_zones;
} NvmeParams;
typedef struct NvmeAsyncEvent {
@@ -103,6 +105,8 @@ typedef struct NvmeNamespace {
NvmeZoneList *imp_open_zones;
NvmeZoneList *closed_zones;
NvmeZoneList *full_zones;
+ int32_t nr_open_zones;
+ int32_t nr_active_zones;
} NvmeNamespace;
static inline NvmeLBAF *nvme_ns_lbaf(NvmeNamespace *ns)
--
2.21.0
- [PATCH v2 08/18] hw/block/nvme: Make Zoned NS Command Set definitions, (continued)
- [PATCH v2 08/18] hw/block/nvme: Make Zoned NS Command Set definitions, Dmitry Fomichev, 2020/06/17
- [PATCH v2 09/18] hw/block/nvme: Define Zoned NS Command Set trace events, Dmitry Fomichev, 2020/06/17
- [PATCH v2 10/18] hw/block/nvme: Support Zoned Namespace Command Set, Dmitry Fomichev, 2020/06/17
- [PATCH v2 12/18] hw/block/nvme: Simulate Zone Active excursions, Dmitry Fomichev, 2020/06/17
- [PATCH v2 11/18] hw/block/nvme: Introduce max active and open zone limits,
Dmitry Fomichev <=
- [PATCH v2 13/18] hw/block/nvme: Set Finish/Reset Zone Recommended attributes, Dmitry Fomichev, 2020/06/17
- [PATCH v2 15/18] hw/block/nvme: Support Zone Descriptor Extensions, Dmitry Fomichev, 2020/06/17
- [PATCH v2 14/18] hw/block/nvme: Generate zone AENs, Dmitry Fomichev, 2020/06/17
- [PATCH v2 16/18] hw/block/nvme: Add injection of Offline/Read-Only zones, Dmitry Fomichev, 2020/06/17
- [PATCH v2 18/18] hw/block/nvme: Document zoned parameters in usage text, Dmitry Fomichev, 2020/06/17
- [PATCH v2 17/18] hw/block/nvme: Use zone metadata file for persistence, Dmitry Fomichev, 2020/06/17
- RE: [PATCH v2 00/18] hw/block/nvme: Support Namespace Types and Zoned Namespace Command Set, Dmitry Fomichev, 2020/06/29