diff options
Diffstat (limited to 'hw/block/nvme.c')
| -rw-r--r-- | hw/block/nvme.c | 885 |
1 files changed, 885 insertions, 0 deletions
diff --git a/hw/block/nvme.c b/hw/block/nvme.c new file mode 100644 index 0000000..5db941c --- /dev/null +++ b/hw/block/nvme.c @@ -0,0 +1,885 @@ +/* + * QEMU NVM Express Controller + * + * Copyright (c) 2012, Intel Corporation + * + * Written by Keith Busch <keith.busch@intel.com> + * + * This code is licensed under the GNU GPL v2 or later. + */ + +/** + * Reference Specs: http://www.nvmexpress.org, 1.1, 1.0e + * + * http://www.nvmexpress.org/resources/ + */ + +/** + * Usage: add options: + * -drive file=<file>,if=none,id=<drive_id> + * -device nvme,drive=<drive_id>,serial=<serial>,id=<id[optional]> + */ + +#include <hw/block/block.h> +#include <hw/hw.h> +#include <hw/pci/msix.h> +#include <hw/pci/pci.h> + +#include "nvme.h" + +static void nvme_process_sq(void *opaque); + +static int nvme_check_sqid(NvmeCtrl *n, uint16_t sqid) +{ + return sqid < n->num_queues && n->sq[sqid] != NULL ? 0 : -1; +} + +static int nvme_check_cqid(NvmeCtrl *n, uint16_t cqid) +{ + return cqid < n->num_queues && n->cq[cqid] != NULL ? 0 : -1; +} + +static void nvme_inc_cq_tail(NvmeCQueue *cq) +{ + cq->tail++; + if (cq->tail >= cq->size) { + cq->tail = 0; + cq->phase = !cq->phase; + } +} + +static void nvme_inc_sq_head(NvmeSQueue *sq) +{ + sq->head = (sq->head + 1) % sq->size; +} + +static uint8_t nvme_cq_full(NvmeCQueue *cq) +{ + return (cq->tail + 1) % cq->size == cq->head; +} + +static uint8_t nvme_sq_empty(NvmeSQueue *sq) +{ + return sq->head == sq->tail; +} + +static void nvme_isr_notify(NvmeCtrl *n, NvmeCQueue *cq) +{ + if (cq->irq_enabled) { + if (msix_enabled(&(n->parent_obj))) { + msix_notify(&(n->parent_obj), cq->vector); + } else { + qemu_irq_pulse(n->parent_obj.irq[0]); + } + } +} + +static uint16_t nvme_map_prp(QEMUSGList *qsg, uint64_t prp1, uint64_t prp2, + uint32_t len, NvmeCtrl *n) +{ + hwaddr trans_len = n->page_size - (prp1 % n->page_size); + trans_len = MIN(len, trans_len); + int num_prps = (len >> n->page_bits) + 1; + + if (!prp1) { + return NVME_INVALID_FIELD | NVME_DNR; + } + + qemu_sglist_init(qsg, num_prps, pci_dma_context(&n->parent_obj)); + qemu_sglist_add(qsg, prp1, trans_len); + len -= trans_len; + if (len) { + if (!prp2) { + goto unmap; + } + if (len > n->page_size) { + uint64_t prp_list[n->max_prp_ents]; + uint32_t nents, prp_trans; + int i = 0; + + nents = (len + n->page_size - 1) >> n->page_bits; + prp_trans = MIN(n->max_prp_ents, nents) * sizeof(uint64_t); + pci_dma_read(&n->parent_obj, prp2, (void *)prp_list, prp_trans); + while (len != 0) { + uint64_t prp_ent = le64_to_cpu(prp_list[i]); + + if (i == n->max_prp_ents - 1 && len > n->page_size) { + if (!prp_ent || prp_ent & (n->page_size - 1)) { + goto unmap; + } + + i = 0; + nents = (len + n->page_size - 1) >> n->page_bits; + prp_trans = MIN(n->max_prp_ents, nents) * sizeof(uint64_t); + pci_dma_read(&n->parent_obj, prp_ent, (void *)prp_list, + prp_trans); + prp_ent = le64_to_cpu(prp_list[i]); + } + + if (!prp_ent || prp_ent & (n->page_size - 1)) { + goto unmap; + } + + trans_len = MIN(len, n->page_size); + qemu_sglist_add(qsg, prp_ent, trans_len); + len -= trans_len; + i++; + } + } else { + if (prp2 & (n->page_size - 1)) { + goto unmap; + } + qemu_sglist_add(qsg, prp2, len); + } + } + return NVME_SUCCESS; + + unmap: + qemu_sglist_destroy(qsg); + return NVME_INVALID_FIELD | NVME_DNR; +} + +static uint16_t nvme_dma_read_prp(NvmeCtrl *n, uint8_t *ptr, uint32_t len, + uint64_t prp1, uint64_t prp2) +{ + QEMUSGList qsg; + + if (nvme_map_prp(&qsg, prp1, prp2, len, n)) { + return NVME_INVALID_FIELD | NVME_DNR; + } + if (dma_buf_read(ptr, len, &qsg)) { + qemu_sglist_destroy(&qsg); + return NVME_INVALID_FIELD | NVME_DNR; + } + return NVME_SUCCESS; +} + +static void nvme_post_cqes(void *opaque) +{ + NvmeCQueue *cq = opaque; + NvmeCtrl *n = cq->ctrl; + NvmeRequest *req, *next; + + QTAILQ_FOREACH_SAFE(req, &cq->req_list, entry, next) { + NvmeSQueue *sq; + hwaddr addr; + + if (nvme_cq_full(cq)) { + break; + } + + QTAILQ_REMOVE(&cq->req_list, req, entry); + sq = req->sq; + req->cqe.status = cpu_to_le16((req->status << 1) | cq->phase); + req->cqe.sq_id = cpu_to_le16(sq->sqid); + req->cqe.sq_head = cpu_to_le16(sq->head); + addr = cq->dma_addr + cq->tail * n->cqe_size; + nvme_inc_cq_tail(cq); + pci_dma_write(&n->parent_obj, addr, (void *)&req->cqe, + sizeof(req->cqe)); + QTAILQ_INSERT_TAIL(&sq->req_list, req, entry); + } + nvme_isr_notify(n, cq); +} + +static void nvme_enqueue_req_completion(NvmeCQueue *cq, NvmeRequest *req) +{ + assert(cq->cqid == req->sq->cqid); + QTAILQ_REMOVE(&req->sq->out_req_list, req, entry); + QTAILQ_INSERT_TAIL(&cq->req_list, req, entry); + qemu_mod_timer(cq->timer, qemu_get_clock_ns(vm_clock) + 500); +} + +static void nvme_rw_cb(void *opaque, int ret) +{ + NvmeRequest *req = opaque; + NvmeSQueue *sq = req->sq; + NvmeCtrl *n = sq->ctrl; + NvmeCQueue *cq = n->cq[sq->cqid]; + + bdrv_acct_done(n->conf.bs, &req->acct); + if (!ret) { + req->status = NVME_SUCCESS; + } else { + req->status = NVME_INTERNAL_DEV_ERROR; + } + + qemu_sglist_destroy(&req->qsg); + nvme_enqueue_req_completion(cq, req); +} + +static uint16_t nvme_rw(NvmeCtrl *n, NvmeNamespace *ns, NvmeCmd *cmd, + NvmeRequest *req) +{ + NvmeRwCmd *rw = (NvmeRwCmd *)cmd; + uint32_t nlb = le32_to_cpu(rw->nlb) + 1; + uint64_t slba = le64_to_cpu(rw->slba); + uint64_t prp1 = le64_to_cpu(rw->prp1); + uint64_t prp2 = le64_to_cpu(rw->prp2); + + uint8_t lba_index = NVME_ID_NS_FLBAS_INDEX(ns->id_ns.flbas); + uint8_t data_shift = ns->id_ns.lbaf[lba_index].ds; + uint64_t data_size = nlb << data_shift; + uint64_t aio_slba = slba << (data_shift - BDRV_SECTOR_BITS); + int is_write = rw->opcode == NVME_CMD_WRITE ? 1 : 0; + + if ((slba + nlb) > ns->id_ns.nsze) { + return NVME_LBA_RANGE | NVME_DNR; + } + if (nvme_map_prp(&req->qsg, prp1, prp2, data_size, n)) { + return NVME_INVALID_FIELD | NVME_DNR; + } + assert((nlb << data_shift) == req->qsg.size); + + dma_acct_start(n->conf.bs, &req->acct, &req->qsg, is_write ? + BDRV_ACCT_WRITE : BDRV_ACCT_READ); + req->aiocb = is_write ? + dma_bdrv_write(n->conf.bs, &req->qsg, aio_slba, nvme_rw_cb, req) : + dma_bdrv_read(n->conf.bs, &req->qsg, aio_slba, nvme_rw_cb, req); + + return NVME_NO_COMPLETE; +} + +static uint16_t nvme_io_cmd(NvmeCtrl *n, NvmeCmd *cmd, NvmeRequest *req) +{ + NvmeNamespace *ns; + uint32_t nsid = le32_to_cpu(cmd->nsid); + + if (nsid == 0 || nsid > n->num_namespaces) { + return NVME_INVALID_NSID | NVME_DNR; + } + + ns = &n->namespaces[nsid - 1]; + switch (cmd->opcode) { + case NVME_CMD_FLUSH: + return NVME_SUCCESS; + case NVME_CMD_WRITE: + case NVME_CMD_READ: + return nvme_rw(n, ns, cmd, req); + default: + return NVME_INVALID_OPCODE | NVME_DNR; + } +} + +static void nvme_free_sq(NvmeSQueue *sq, NvmeCtrl *n) +{ + n->sq[sq->sqid] = NULL; + qemu_del_timer(sq->timer); + qemu_free_timer(sq->timer); + g_free(sq->io_req); + if (sq->sqid) { + g_free(sq); + } +} + +static uint16_t nvme_del_sq(NvmeCtrl *n, NvmeCmd *cmd) +{ + NvmeDeleteQ *c = (NvmeDeleteQ *)cmd; + NvmeRequest *req, *next; + NvmeSQueue *sq; + NvmeCQueue *cq; + uint16_t qid = le16_to_cpu(c->qid); + + if (!qid || nvme_check_sqid(n, qid)) { + return NVME_INVALID_QID | NVME_DNR; + } + + sq = n->sq[qid]; + while (!QTAILQ_EMPTY(&sq->out_req_list)) { + req = QTAILQ_FIRST(&sq->out_req_list); + assert(req->aiocb); + bdrv_aio_cancel(req->aiocb); + } + if (!nvme_check_cqid(n, sq->cqid)) { + cq = n->cq[sq->cqid]; + QTAILQ_REMOVE(&cq->sq_list, sq, entry); + + nvme_post_cqes(cq); + QTAILQ_FOREACH_SAFE(req, &cq->req_list, entry, next) { + if (req->sq == sq) { + QTAILQ_REMOVE(&cq->req_list, req, entry); + QTAILQ_INSERT_TAIL(&sq->req_list, req, entry); + } + } + } + + nvme_free_sq(sq, n); + return NVME_SUCCESS; +} + +static void nvme_init_sq(NvmeSQueue *sq, NvmeCtrl *n, uint64_t dma_addr, + uint16_t sqid, uint16_t cqid, uint16_t size) +{ + int i; + NvmeCQueue *cq; + + sq->ctrl = n; + sq->dma_addr = dma_addr; + sq->sqid = sqid; + sq->size = size; + sq->cqid = cqid; + sq->head = sq->tail = 0; + sq->io_req = g_malloc(sq->size * sizeof(*sq->io_req)); + + QTAILQ_INIT(&sq->req_list); + QTAILQ_INIT(&sq->out_req_list); + for (i = 0; i < sq->size; i++) { + sq->io_req[i].sq = sq; + QTAILQ_INSERT_TAIL(&(sq->req_list), &sq->io_req[i], entry); + } + sq->timer = qemu_new_timer_ns(vm_clock, nvme_process_sq, sq); + + assert(n->cq[cqid]); + cq = n->cq[cqid]; + QTAILQ_INSERT_TAIL(&(cq->sq_list), sq, entry); + n->sq[sqid] = sq; +} + +static uint16_t nvme_create_sq(NvmeCtrl *n, NvmeCmd *cmd) +{ + NvmeSQueue *sq; + NvmeCreateSq *c = (NvmeCreateSq *)cmd; + + uint16_t cqid = le16_to_cpu(c->cqid); + uint16_t sqid = le16_to_cpu(c->sqid); + uint16_t qsize = le16_to_cpu(c->qsize); + uint16_t qflags = le16_to_cpu(c->sq_flags); + uint64_t prp1 = le64_to_cpu(c->prp1); + + if (!cqid || nvme_check_cqid(n, cqid)) { + return NVME_INVALID_CQID | NVME_DNR; + } + if (!sqid || (sqid && !nvme_check_sqid(n, sqid))) { + return NVME_INVALID_QID | NVME_DNR; + } + if (!qsize || qsize > NVME_CAP_MQES(n->bar.cap)) { + return NVME_MAX_QSIZE_EXCEEDED | NVME_DNR; + } + if (!prp1 || prp1 & (n->page_size - 1)) { + return NVME_INVALID_FIELD | NVME_DNR; + } + if (!(NVME_SQ_FLAGS_PC(qflags))) { + return NVME_INVALID_FIELD | NVME_DNR; + } + sq = g_malloc0(sizeof(*sq)); + nvme_init_sq(sq, n, prp1, sqid, cqid, qsize + 1); + return NVME_SUCCESS; +} + +static void nvme_free_cq(NvmeCQueue *cq, NvmeCtrl *n) +{ + n->cq[cq->cqid] = NULL; + qemu_del_timer(cq->timer); + qemu_free_timer(cq->timer); + msix_vector_unuse(&n->parent_obj, cq->vector); + if (cq->cqid) { + g_free(cq); + } +} + +static uint16_t nvme_del_cq(NvmeCtrl *n, NvmeCmd *cmd) +{ + NvmeDeleteQ *c = (NvmeDeleteQ *)cmd; + NvmeCQueue *cq; + uint16_t qid = le16_to_cpu(c->qid); + + if (!qid || nvme_check_cqid(n, qid)) { + return NVME_INVALID_CQID | NVME_DNR; + } + + cq = n->cq[qid]; + if (!QTAILQ_EMPTY(&cq->sq_list)) { + return NVME_INVALID_QUEUE_DEL; + } + nvme_free_cq(cq, n); + return NVME_SUCCESS; +} + +static void nvme_init_cq(NvmeCQueue *cq, NvmeCtrl *n, uint64_t dma_addr, + uint16_t cqid, uint16_t vector, uint16_t size, uint16_t irq_enabled) +{ + cq->ctrl = n; + cq->cqid = cqid; + cq->size = size; + cq->dma_addr = dma_addr; + cq->phase = 1; + cq->irq_enabled = irq_enabled; + cq->vector = vector; + cq->head = cq->tail = 0; + QTAILQ_INIT(&cq->req_list); + QTAILQ_INIT(&cq->sq_list); + msix_vector_use(&n->parent_obj, cq->vector); + n->cq[cqid] = cq; + cq->timer = qemu_new_timer_ns(vm_clock, nvme_post_cqes, cq); +} + +static uint16_t nvme_create_cq(NvmeCtrl *n, NvmeCmd *cmd) +{ + NvmeCQueue *cq; + NvmeCreateCq *c = (NvmeCreateCq *)cmd; + uint16_t cqid = le16_to_cpu(c->cqid); + uint16_t vector = le16_to_cpu(c->irq_vector); + uint16_t qsize = le16_to_cpu(c->qsize); + uint16_t qflags = le16_to_cpu(c->cq_flags); + uint64_t prp1 = le64_to_cpu(c->prp1); + + if (!cqid || (cqid && !nvme_check_cqid(n, cqid))) { + return NVME_INVALID_CQID | NVME_DNR; + } + if (!qsize || qsize > NVME_CAP_MQES(n->bar.cap)) { + return NVME_MAX_QSIZE_EXCEEDED | NVME_DNR; + } + if (!prp1) { + return NVME_INVALID_FIELD | NVME_DNR; + } + if (vector > n->num_queues) { + return NVME_INVALID_IRQ_VECTOR | NVME_DNR; + } + if (!(NVME_CQ_FLAGS_PC(qflags))) { + return NVME_INVALID_FIELD | NVME_DNR; + } + + cq = g_malloc0(sizeof(*cq)); + nvme_init_cq(cq, n, prp1, cqid, vector, qsize + 1, + NVME_CQ_FLAGS_IEN(qflags)); + return NVME_SUCCESS; +} + +static uint16_t nvme_identify(NvmeCtrl *n, NvmeCmd *cmd) +{ + NvmeNamespace *ns; + NvmeIdentify *c = (NvmeIdentify *)cmd; + uint32_t cns = le32_to_cpu(c->cns); + uint32_t nsid = le32_to_cpu(c->nsid); + uint64_t prp1 = le64_to_cpu(c->prp1); + uint64_t prp2 = le64_to_cpu(c->prp2); + + if (cns) { + return nvme_dma_read_prp(n, (uint8_t *)&n->id_ctrl, sizeof(n->id_ctrl), + prp1, prp2); + } + if (nsid == 0 || nsid > n->num_namespaces) { + return NVME_INVALID_NSID | NVME_DNR; + } + + ns = &n->namespaces[nsid - 1]; + return nvme_dma_read_prp(n, (uint8_t *)&ns->id_ns, sizeof(ns->id_ns), + prp1, prp2); +} + +static uint16_t nvme_get_feature(NvmeCtrl *n, NvmeCmd *cmd, NvmeRequest *req) +{ + uint32_t dw10 = le32_to_cpu(cmd->cdw10); + + switch (dw10) { + case NVME_NUMBER_OF_QUEUES: + req->cqe.result = cpu_to_le32(n->num_queues); + break; + default: + return NVME_INVALID_FIELD | NVME_DNR; + } + return NVME_SUCCESS; +} + +static uint16_t nvme_set_feature(NvmeCtrl *n, NvmeCmd *cmd, NvmeRequest *req) +{ + uint32_t dw10 = le32_to_cpu(cmd->cdw10); + + switch (dw10) { + case NVME_NUMBER_OF_QUEUES: + req->cqe.result = cpu_to_le32(n->num_queues); + break; + default: + return NVME_INVALID_FIELD | NVME_DNR; + } + return NVME_SUCCESS; +} + +static uint16_t nvme_admin_cmd(NvmeCtrl *n, NvmeCmd *cmd, NvmeRequest *req) +{ + switch (cmd->opcode) { + case NVME_ADM_CMD_DELETE_SQ: + return nvme_del_sq(n, cmd); + case NVME_ADM_CMD_CREATE_SQ: + return nvme_create_sq(n, cmd); + case NVME_ADM_CMD_DELETE_CQ: + return nvme_del_cq(n, cmd); + case NVME_ADM_CMD_CREATE_CQ: + return nvme_create_cq(n, cmd); + case NVME_ADM_CMD_IDENTIFY: + return nvme_identify(n, cmd); + case NVME_ADM_CMD_SET_FEATURES: + return nvme_set_feature(n, cmd, req); + case NVME_ADM_CMD_GET_FEATURES: + return nvme_get_feature(n, cmd, req); + default: + return NVME_INVALID_OPCODE | NVME_DNR; + } +} + +static void nvme_process_sq(void *opaque) +{ + NvmeSQueue *sq = opaque; + NvmeCtrl *n = sq->ctrl; + NvmeCQueue *cq = n->cq[sq->cqid]; + + uint16_t status; + hwaddr addr; + NvmeCmd cmd; + NvmeRequest *req; + + while (!(nvme_sq_empty(sq) || QTAILQ_EMPTY(&sq->req_list))) { + addr = sq->dma_addr + sq->head * n->sqe_size; + pci_dma_read(&n->parent_obj, addr, (void *)&cmd, sizeof(cmd)); + nvme_inc_sq_head(sq); + + req = QTAILQ_FIRST(&sq->req_list); + QTAILQ_REMOVE(&sq->req_list, req, entry); + QTAILQ_INSERT_TAIL(&sq->out_req_list, req, entry); + memset(&req->cqe, 0, sizeof(req->cqe)); + req->cqe.cid = cmd.cid; + + status = sq->sqid ? nvme_io_cmd(n, &cmd, req) : + nvme_admin_cmd(n, &cmd, req); + if (status != NVME_NO_COMPLETE) { + req->status = status; + nvme_enqueue_req_completion(cq, req); + } + } +} + +static void nvme_clear_ctrl(NvmeCtrl *n) +{ + int i; + + for (i = 0; i < n->num_queues; i++) { + if (n->sq[i] != NULL) { + nvme_free_sq(n->sq[i], n); + } + } + for (i = 0; i < n->num_queues; i++) { + if (n->cq[i] != NULL) { + nvme_free_cq(n->cq[i], n); + } + } + + bdrv_flush(n->conf.bs); + n->bar.cc = 0; +} + +static int nvme_start_ctrl(NvmeCtrl *n) +{ + uint32_t page_bits = NVME_CC_MPS(n->bar.cc) + 12; + uint32_t page_size = 1 << page_bits; + + if (n->cq[0] || n->sq[0] || !n->bar.asq || !n->bar.acq || + n->bar.asq & (page_size - 1) || n->bar.acq & (page_size - 1) || + NVME_CC_MPS(n->bar.cc) < NVME_CAP_MPSMIN(n->bar.cap) || + NVME_CC_MPS(n->bar.cc) > NVME_CAP_MPSMAX(n->bar.cap) || + NVME_CC_IOCQES(n->bar.cc) < NVME_CTRL_CQES_MIN(n->id_ctrl.cqes) || + NVME_CC_IOCQES(n->bar.cc) > NVME_CTRL_CQES_MAX(n->id_ctrl.cqes) || + NVME_CC_IOSQES(n->bar.cc) < NVME_CTRL_SQES_MIN(n->id_ctrl.sqes) || + NVME_CC_IOSQES(n->bar.cc) > NVME_CTRL_SQES_MAX(n->id_ctrl.sqes) || + !NVME_AQA_ASQS(n->bar.aqa) || NVME_AQA_ASQS(n->bar.aqa) > 4095 || + !NVME_AQA_ACQS(n->bar.aqa) || NVME_AQA_ACQS(n->bar.aqa) > 4095) { + return -1; + } + + n->page_bits = page_bits; + n->page_size = page_size; + n->max_prp_ents = n->page_size / sizeof(uint64_t); + n->cqe_size = 1 << NVME_CC_IOCQES(n->bar.cc); + n->sqe_size = 1 << NVME_CC_IOSQES(n->bar.cc); + nvme_init_cq(&n->admin_cq, n, n->bar.acq, 0, 0, + NVME_AQA_ACQS(n->bar.aqa) + 1, 1); + nvme_init_sq(&n->admin_sq, n, n->bar.asq, 0, 0, + NVME_AQA_ASQS(n->bar.aqa) + 1); + + return 0; +} + +static void nvme_write_bar(NvmeCtrl *n, hwaddr offset, uint64_t data, + unsigned size) +{ + switch (offset) { + case 0xc: + n->bar.intms |= data & 0xffffffff; + n->bar.intmc = n->bar.intms; + break; + case 0x10: + n->bar.intms &= ~(data & 0xffffffff); + n->bar.intmc = n->bar.intms; + break; + case 0x14: + if (NVME_CC_EN(data) && !NVME_CC_EN(n->bar.cc)) { + n->bar.cc = data; + if (nvme_start_ctrl(n)) { + n->bar.csts = NVME_CSTS_FAILED; + } else { + n->bar.csts = NVME_CSTS_READY; + } + } else if (!NVME_CC_EN(data) && NVME_CC_EN(n->bar.cc)) { + nvme_clear_ctrl(n); + n->bar.csts &= ~NVME_CSTS_READY; + } + if (NVME_CC_SHN(data) && !(NVME_CC_SHN(n->bar.cc))) { + nvme_clear_ctrl(n); + n->bar.cc = data; + n->bar.csts |= NVME_CSTS_SHST_COMPLETE; + } else if (!NVME_CC_SHN(data) && NVME_CC_SHN(n->bar.cc)) { + n->bar.csts &= ~NVME_CSTS_SHST_COMPLETE; + n->bar.cc = data; + } + break; + case 0x24: + n->bar.aqa = data & 0xffffffff; + break; + case 0x28: + n->bar.asq = data; + break; + case 0x2c: + n->bar.asq |= data << 32; + break; + case 0x30: + n->bar.acq = data; + break; + case 0x34: + n->bar.acq |= data << 32; + break; + default: + break; + } +} + +static uint64_t nvme_mmio_read(void *opaque, hwaddr addr, unsigned size) +{ + NvmeCtrl *n = (NvmeCtrl *)opaque; + uint8_t *ptr = (uint8_t *)&n->bar; + uint64_t val = 0; + + if (addr < sizeof(n->bar)) { + memcpy(&val, ptr + addr, size); + } + return val; +} + +static void nvme_process_db(NvmeCtrl *n, hwaddr addr, int val) +{ + uint32_t qid; + + if (addr & ((1 << 2) - 1)) { + return; + } + + if (((addr - 0x1000) >> 2) & 1) { + uint16_t new_head = val & 0xffff; + int start_sqs; + NvmeCQueue *cq; + + qid = (addr - (0x1000 + (1 << 2))) >> 3; + if (nvme_check_cqid(n, qid)) { + return; + } + + cq = n->cq[qid]; + if (new_head >= cq->size) { + return; + } + + start_sqs = nvme_cq_full(cq) ? 1 : 0; + cq->head = new_head; + if (start_sqs) { + NvmeSQueue *sq; + QTAILQ_FOREACH(sq, &cq->sq_list, entry) { + qemu_mod_timer(sq->timer, qemu_get_clock_ns(vm_clock) + 500); + } + qemu_mod_timer(cq->timer, qemu_get_clock_ns(vm_clock) + 500); + } + + if (cq->tail != cq->head) { + nvme_isr_notify(n, cq); + } + } else { + uint16_t new_tail = val & 0xffff; + NvmeSQueue *sq; + + qid = (addr - 0x1000) >> 3; + if (nvme_check_sqid(n, qid)) { + return; + } + + sq = n->sq[qid]; + if (new_tail >= sq->size) { + return; + } + + sq->tail = new_tail; + qemu_mod_timer(sq->timer, qemu_get_clock_ns(vm_clock) + 500); + } +} + +static void nvme_mmio_write(void *opaque, hwaddr addr, uint64_t data, + unsigned size) +{ + NvmeCtrl *n = (NvmeCtrl *)opaque; + if (addr < sizeof(n->bar)) { + nvme_write_bar(n, addr, data, size); + } else if (addr >= 0x1000) { + nvme_process_db(n, addr, data); + } +} + +static const MemoryRegionOps nvme_mmio_ops = { + .read = nvme_mmio_read, + .write = nvme_mmio_write, + .endianness = DEVICE_LITTLE_ENDIAN, + .impl = { + .min_access_size = 2, + .max_access_size = 8, + }, +}; + +static int nvme_init(PCIDevice *pci_dev) +{ + NvmeCtrl *n = NVME(pci_dev); + NvmeIdCtrl *id = &n->id_ctrl; + + int i; + int64_t bs_size; + uint8_t *pci_conf; + + if (!(n->conf.bs)) { + return -1; + } + + bs_size = bdrv_getlength(n->conf.bs); + if (bs_size <= 0) { + return -1; + } + + blkconf_serial(&n->conf, &n->serial); + if (!n->serial) { + return -1; + } + + pci_conf = pci_dev->config; + pci_conf[PCI_INTERRUPT_PIN] = 1; + pci_config_set_prog_interface(pci_dev->config, 0x2); + pci_config_set_class(pci_dev->config, PCI_CLASS_STORAGE_EXPRESS); + pcie_endpoint_cap_init(&n->parent_obj, 0x80); + + n->num_namespaces = 1; + n->num_queues = 64; + n->reg_size = 1 << qemu_fls(0x1004 + 2 * (n->num_queues + 1) * 4); + n->ns_size = bs_size / (uint64_t)n->num_namespaces; + + n->namespaces = g_malloc0(sizeof(*n->namespaces)*n->num_namespaces); + n->sq = g_malloc0(sizeof(*n->sq)*n->num_queues); + n->cq = g_malloc0(sizeof(*n->cq)*n->num_queues); + + memory_region_init_io(&n->iomem, &nvme_mmio_ops, n, "nvme", n->reg_size); + pci_register_bar(&n->parent_obj, 0, + PCI_BASE_ADDRESS_SPACE_MEMORY | PCI_BASE_ADDRESS_MEM_TYPE_64, + &n->iomem); + msix_init_exclusive_bar(&n->parent_obj, n->num_queues, 4); + + 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)); + strpadcpy((char *)id->mn, sizeof(id->mn), "QEMU NVMe Ctrl", ' '); + strpadcpy((char *)id->fr, sizeof(id->fr), "1.0", ' '); + strpadcpy((char *)id->sn, sizeof(id->sn), n->serial, ' '); + id->rab = 6; + id->ieee[0] = 0x00; + id->ieee[1] = 0x02; + id->ieee[2] = 0xb3; + id->oacs = cpu_to_le16(0); + id->frmw = 7 << 1; + id->lpa = 1 << 0; + id->sqes = (0x6 << 4) | 0x6; + id->cqes = (0x4 << 4) | 0x4; + id->nn = cpu_to_le32(n->num_namespaces); + id->psd[0].mp = cpu_to_le16(0x9c4); + id->psd[0].enlat = cpu_to_le32(0x10); + id->psd[0].exlat = cpu_to_le32(0x4); + + n->bar.cap = 0; + NVME_CAP_SET_MQES(n->bar.cap, 0x7ff); + NVME_CAP_SET_CQR(n->bar.cap, 1); + NVME_CAP_SET_AMS(n->bar.cap, 1); + NVME_CAP_SET_TO(n->bar.cap, 0xf); + NVME_CAP_SET_CSS(n->bar.cap, 1); + + n->bar.vs = 0x00010001; + n->bar.intmc = n->bar.intms = 0; + + for (i = 0; i < n->num_namespaces; i++) { + NvmeNamespace *ns = &n->namespaces[i]; + NvmeIdNs *id_ns = &ns->id_ns; + id_ns->nsfeat = 0; + id_ns->nlbaf = 0; + id_ns->flbas = 0; + id_ns->mc = 0; + id_ns->dpc = 0; + id_ns->dps = 0; + id_ns->lbaf[0].ds = BDRV_SECTOR_BITS; + id_ns->ncap = id_ns->nuse = id_ns->nsze = + cpu_to_le64(n->ns_size >> + id_ns->lbaf[NVME_ID_NS_FLBAS_INDEX(ns->id_ns.flbas)].ds); + } + return 0; +} + +static void nvme_exit(PCIDevice *pci_dev) +{ + NvmeCtrl *n = NVME(pci_dev); + + nvme_clear_ctrl(n); + g_free(n->namespaces); + g_free(n->cq); + g_free(n->sq); + msix_uninit_exclusive_bar(pci_dev); + memory_region_destroy(&n->iomem); +} + +static Property nvme_props[] = { + DEFINE_BLOCK_PROPERTIES(NvmeCtrl, conf), + DEFINE_PROP_STRING("serial", NvmeCtrl, serial), + DEFINE_PROP_END_OF_LIST(), +}; + +static const VMStateDescription nvme_vmstate = { + .name = "nvme", + .unmigratable = 1, +}; + +static void nvme_class_init(ObjectClass *oc, void *data) +{ + DeviceClass *dc = DEVICE_CLASS(oc); + PCIDeviceClass *pc = PCI_DEVICE_CLASS(oc); + + pc->init = nvme_init; + pc->exit = nvme_exit; + pc->class_id = PCI_CLASS_STORAGE_EXPRESS; + pc->vendor_id = PCI_VENDOR_ID_INTEL; + pc->device_id = 0x5845; + pc->revision = 1; + pc->is_express = 1; + + dc->desc = "Non-Volatile Memory Express"; + dc->props = nvme_props; + dc->vmsd = &nvme_vmstate; +} + +static const TypeInfo nvme_info = { + .name = "nvme", + .parent = TYPE_PCI_DEVICE, + .instance_size = sizeof(NvmeCtrl), + .class_init = nvme_class_init, +}; + +static void nvme_register_types(void) +{ + type_register_static(&nvme_info); +} + +type_init(nvme_register_types) |