From dce22c864612659793342bb99bd3d7a91f31afd6 Mon Sep 17 00:00:00 2001 From: Klaus Jensen Date: Tue, 9 Jun 2020 21:03:19 +0200 Subject: [PATCH] hw/block/nvme: add max_ioqpairs device parameter MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 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 Reviewed-by: Maxim Levitsky Reviewed-by: Philippe Mathieu-Daudé Reviewed-by: Keith Busch Message-Id: <20200609190333.59390-9-its@irrelevant.dk> Signed-off-by: Kevin Wolf --- hw/block/nvme.c | 51 ++++++++++++++++++++++++++++++------------------- hw/block/nvme.h | 3 ++- 2 files changed, 33 insertions(+), 21 deletions(-) diff --git a/hw/block/nvme.c b/hw/block/nvme.c index ee514625ee..1c1d2f8b77 100644 --- a/hw/block/nvme.c +++ b/hw/block/nvme.c @@ -20,7 +20,7 @@ * -device nvme,drive=,serial=,id=, \ * cmb_size_mb=, \ * [pmrdev=,] \ - * num_queues= + * max_ioqpairs= * * 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(), }; diff --git a/hw/block/nvme.h b/hw/block/nvme.h index 91f16c8125..26c38bd913 100644 --- a/hw/block/nvme.h +++ b/hw/block/nvme.h @@ -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;