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hw/block/nvme: add max_ioqpairs device parameter 

The num_queues device paramater has a slightly confusing meaning because
it accounts for the admin queue pair which is not really optional.
Secondly, it is really a maximum value of queues allowed.

Add a new max_ioqpairs parameter that only accounts for I/O queue pairs,
but keep num_queues for compatibility.

Signed-off-by: Klaus Jensen <k.jensen@samsung.com>
Reviewed-by: Maxim Levitsky <mlevitsk@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Keith Busch <kbusch@kernel.org>
Message-Id: <20200609190333.59390-9-its@irrelevant.dk>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Klaus Jensen 2020-06-09 21:03:19 +02:00 committed by Kevin Wolf
parent ca247d3509
commit dce22c8646
2 changed files with 33 additions and 21 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

51
hw/block/nvme.c
View File

@ -20,7 +20,7 @@
* -device nvme,drive=<drive_id>,serial=<serial>,id=<id[optional]>, \
* cmb_size_mb=<cmb_size_mb[optional]>, \
* [pmrdev=<mem_backend_file_id>,] \
* num_queues=<N[optional]>
* max_ioqpairs=<N[optional]>
*
* Note cmb_size_mb denotes size of CMB in MB. CMB is assumed to be at
* offset 0 in BAR2 and supports only WDS, RDS and SQS for now.
@ -36,6 +36,7 @@
#include "qemu/osdep.h"
#include "qemu/units.h"
#include "qemu/error-report.h"
#include "hw/block/block.h"
#include "hw/pci/msix.h"
#include "hw/pci/pci.h"
@ -85,12 +86,12 @@ static void nvme_addr_read(NvmeCtrl *n, hwaddr addr, void *buf, int size)
static int nvme_check_sqid(NvmeCtrl *n, uint16_t sqid)
{
return sqid < n->params.num_queues && n->sq[sqid] != NULL ? 0 : -1;
return sqid < n->params.max_ioqpairs + 1 && n->sq[sqid] != NULL ? 0 : -1;
}
static int nvme_check_cqid(NvmeCtrl *n, uint16_t cqid)
{
return cqid < n->params.num_queues && n->cq[cqid] != NULL ? 0 : -1;
return cqid < n->params.max_ioqpairs + 1 && n->cq[cqid] != NULL ? 0 : -1;
}
static void nvme_inc_cq_tail(NvmeCQueue *cq)
@ -656,7 +657,7 @@ static uint16_t nvme_create_cq(NvmeCtrl *n, NvmeCmd *cmd)
trace_pci_nvme_err_invalid_create_cq_vector(vector);
return NVME_INVALID_IRQ_VECTOR | NVME_DNR;
}
if (unlikely(vector > n->params.num_queues)) {
if (unlikely(vector > n->params.max_ioqpairs)) {
trace_pci_nvme_err_invalid_create_cq_vector(vector);
return NVME_INVALID_IRQ_VECTOR | NVME_DNR;
}
@ -808,8 +809,8 @@ static uint16_t nvme_get_feature(NvmeCtrl *n, NvmeCmd *cmd, NvmeRequest *req)
trace_pci_nvme_getfeat_vwcache(result ? "enabled" : "disabled");
break;
case NVME_NUMBER_OF_QUEUES:
result = cpu_to_le32((n->params.num_queues - 2) |
((n->params.num_queues - 2) << 16));
result = cpu_to_le32((n->params.max_ioqpairs - 1) |
((n->params.max_ioqpairs - 1) << 16));
trace_pci_nvme_getfeat_numq(result);
break;
case NVME_TIMESTAMP:
@ -853,10 +854,10 @@ static uint16_t nvme_set_feature(NvmeCtrl *n, NvmeCmd *cmd, NvmeRequest *req)
case NVME_NUMBER_OF_QUEUES:
trace_pci_nvme_setfeat_numq((dw11 & 0xFFFF) + 1,
((dw11 >> 16) & 0xFFFF) + 1,
n->params.num_queues - 1,
n->params.num_queues - 1);
req->cqe.result = cpu_to_le32((n->params.num_queues - 2) |
((n->params.num_queues - 2) << 16));
n->params.max_ioqpairs,
n->params.max_ioqpairs);
req->cqe.result = cpu_to_le32((n->params.max_ioqpairs - 1) |
((n->params.max_ioqpairs - 1) << 16));
break;
case NVME_TIMESTAMP:
return nvme_set_feature_timestamp(n, cmd);
@ -927,12 +928,12 @@ static void nvme_clear_ctrl(NvmeCtrl *n)
blk_drain(n->conf.blk);
for (i = 0; i < n->params.num_queues; i++) {
for (i = 0; i < n->params.max_ioqpairs + 1; i++) {
if (n->sq[i] != NULL) {
nvme_free_sq(n->sq[i], n);
}
}
for (i = 0; i < n->params.num_queues; i++) {
for (i = 0; i < n->params.max_ioqpairs + 1; i++) {
if (n->cq[i] != NULL) {
nvme_free_cq(n->cq[i], n);
}
@ -1362,8 +1363,17 @@ static void nvme_realize(PCIDevice *pci_dev, Error **errp)
int64_t bs_size;
uint8_t *pci_conf;
if (!n->params.num_queues) {
error_setg(errp, "num_queues can't be zero");
if (n->params.num_queues) {
warn_report("num_queues is deprecated; please use max_ioqpairs "
"instead");
n->params.max_ioqpairs = n->params.num_queues - 1;
}
if (n->params.max_ioqpairs < 1 ||
n->params.max_ioqpairs > PCI_MSIX_FLAGS_QSIZE) {
error_setg(errp, "max_ioqpairs must be between 1 and %d",
PCI_MSIX_FLAGS_QSIZE);
return;
}
@ -1413,21 +1423,21 @@ static void nvme_realize(PCIDevice *pci_dev, Error **errp)
n->num_namespaces = 1;
/* num_queues is really number of pairs, so each has two doorbells */
/* add one to max_ioqpairs to account for the admin queue pair */
n->reg_size = pow2ceil(NVME_REG_SIZE +
2 * n->params.num_queues * NVME_DB_SIZE);
2 * (n->params.max_ioqpairs + 1) * NVME_DB_SIZE);
n->ns_size = bs_size / (uint64_t)n->num_namespaces;
n->namespaces = g_new0(NvmeNamespace, n->num_namespaces);
n->sq = g_new0(NvmeSQueue *, n->params.num_queues);
n->cq = g_new0(NvmeCQueue *, n->params.num_queues);
n->sq = g_new0(NvmeSQueue *, n->params.max_ioqpairs + 1);
n->cq = g_new0(NvmeCQueue *, n->params.max_ioqpairs + 1);
memory_region_init_io(&n->iomem, OBJECT(n), &nvme_mmio_ops, n,
"nvme", n->reg_size);
pci_register_bar(pci_dev, 0,
PCI_BASE_ADDRESS_SPACE_MEMORY | PCI_BASE_ADDRESS_MEM_TYPE_64,
&n->iomem);
msix_init_exclusive_bar(pci_dev, n->params.num_queues, 4, NULL);
msix_init_exclusive_bar(pci_dev, n->params.max_ioqpairs + 1, 4, NULL);
id->vid = cpu_to_le16(pci_get_word(pci_conf + PCI_VENDOR_ID));
id->ssvid = cpu_to_le16(pci_get_word(pci_conf + PCI_SUBSYSTEM_VENDOR_ID));
@ -1573,7 +1583,8 @@ static Property nvme_props[] = {
HostMemoryBackend *),
DEFINE_PROP_STRING("serial", NvmeCtrl, params.serial),
DEFINE_PROP_UINT32("cmb_size_mb", NvmeCtrl, params.cmb_size_mb, 0),
DEFINE_PROP_UINT32("num_queues", NvmeCtrl, params.num_queues, 64),
DEFINE_PROP_UINT32("num_queues", NvmeCtrl, params.num_queues, 0),
DEFINE_PROP_UINT32("max_ioqpairs", NvmeCtrl, params.max_ioqpairs, 64),
DEFINE_PROP_END_OF_LIST(),
};

3
hw/block/nvme.h
View File

@ -5,7 +5,8 @@
typedef struct NvmeParams {
char *serial;
uint32_t num_queues;
uint32_t num_queues; /* deprecated since 5.1 */
uint32_t max_ioqpairs;
uint32_t cmb_size_mb;
} NvmeParams;