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Sun, 7 Feb 2021 16:49:50 -0500 (EST) From: Klaus Jensen To: qemu-devel@nongnu.org Subject: [PATCH RFC v2 6/8] hw/block/nvme: refactor nvme_dma Date: Sun, 7 Feb 2021 22:49:38 +0100 Message-Id: <20210207214940.281889-7-its@irrelevant.dk> X-Mailer: git-send-email 2.30.0 In-Reply-To: <20210207214940.281889-1-its@irrelevant.dk> References: <20210207214940.281889-1-its@irrelevant.dk> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=66.111.4.28; envelope-from=its@irrelevant.dk; helo=out4-smtp.messagingengine.com X-Spam_score_int: -27 X-Spam_score: -2.8 X-Spam_bar: -- X-Spam_report: (-2.8 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Kevin Wolf , Fam Zheng , qemu-block@nongnu.org, Klaus Jensen , Gollu Appalanaidu , Max Reitz , Klaus Jensen , Stefan Hajnoczi , Keith Busch Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" From: Klaus Jensen The nvme_dma function doesn't just do DMA (QEMUSGList-based) memory transfers; it also handles QEMUIOVector copies. Introduce the NvmeTxDirection enum and rename to nvme_tx. Remove mapping of PRPs/SGLs from nvme_tx and instead assert that they have been mapped previously. This allows more fine-grained use in subsequent patches. Add new (better named) helpers, nvme_{c2h,h2c}, that does both PRP/SGL mapping and transfer. Signed-off-by: Klaus Jensen --- hw/block/nvme.c | 143 ++++++++++++++++++++++++++---------------------- 1 file changed, 77 insertions(+), 66 deletions(-) diff --git a/hw/block/nvme.c b/hw/block/nvme.c index 24156699b035..2752e5d8572a 100644 --- a/hw/block/nvme.c +++ b/hw/block/nvme.c @@ -843,48 +843,72 @@ static uint16_t nvme_map_dptr(NvmeCtrl *n, NvmeSg *sg, size_t len, } } -static uint16_t nvme_dma(NvmeCtrl *n, uint8_t *ptr, uint32_t len, - DMADirection dir, NvmeRequest *req) +typedef enum NvmeTxDirection { + NVME_TX_DIRECTION_TO_DEVICE = 0, + NVME_TX_DIRECTION_FROM_DEVICE = 1, +} NvmeTxDirection; + +static uint16_t nvme_tx(NvmeCtrl *n, NvmeSg *sg, uint8_t *ptr, uint32_t len, + NvmeTxDirection dir) { - uint16_t status = NVME_SUCCESS; + /* assert that exactly one of qsg and iov carries data */ + assert((sg->qsg.nsg > 0) != (sg->iov.niov > 0)); + + if (sg->qsg.nsg > 0) { + uint64_t residual; + + if (dir == NVME_TX_DIRECTION_TO_DEVICE) { + residual = dma_buf_write(ptr, len, &sg->qsg); + } else { + residual = dma_buf_read(ptr, len, &sg->qsg); + } + + if (unlikely(residual)) { + trace_pci_nvme_err_invalid_dma(); + return NVME_INVALID_FIELD | NVME_DNR; + } + } else { + size_t bytes; + + if (dir == NVME_TX_DIRECTION_TO_DEVICE) { + bytes = qemu_iovec_to_buf(&sg->iov, 0, ptr, len); + } else { + bytes = qemu_iovec_from_buf(&sg->iov, 0, ptr, len); + } + + if (unlikely(bytes != len)) { + trace_pci_nvme_err_invalid_dma(); + return NVME_INVALID_FIELD | NVME_DNR; + } + } + + return NVME_SUCCESS; +} + +static inline uint16_t nvme_c2h(NvmeCtrl *n, uint8_t *ptr, uint32_t len, + NvmeRequest *req) +{ + uint16_t status; status = nvme_map_dptr(n, &req->sg, len, &req->cmd); if (status) { return status; } - /* assert that only one of qsg and iov carries data */ - assert((req->sg.qsg.nsg > 0) != (req->sg.iov.niov > 0)); + return nvme_tx(n, &req->sg, ptr, len, NVME_TX_DIRECTION_FROM_DEVICE); +} - if (req->sg.qsg.nsg > 0) { - uint64_t residual; +static inline uint16_t nvme_h2c(NvmeCtrl *n, uint8_t *ptr, uint32_t len, + NvmeRequest *req) +{ + uint16_t status; - if (dir == DMA_DIRECTION_TO_DEVICE) { - residual = dma_buf_write(ptr, len, &req->sg.qsg); - } else { - residual = dma_buf_read(ptr, len, &req->sg.qsg); - } - - if (unlikely(residual)) { - trace_pci_nvme_err_invalid_dma(); - status = NVME_INVALID_FIELD | NVME_DNR; - } - } else { - size_t bytes; - - if (dir == DMA_DIRECTION_TO_DEVICE) { - bytes = qemu_iovec_to_buf(&req->sg.iov, 0, ptr, len); - } else { - bytes = qemu_iovec_from_buf(&req->sg.iov, 0, ptr, len); - } - - if (unlikely(bytes != len)) { - trace_pci_nvme_err_invalid_dma(); - status = NVME_INVALID_FIELD | NVME_DNR; - } + status = nvme_map_dptr(n, &req->sg, len, &req->cmd); + if (status) { + return status; } - return status; + return nvme_tx(n, &req->sg, ptr, len, NVME_TX_DIRECTION_TO_DEVICE); } static inline void nvme_blk_read(BlockBackend *blk, int64_t offset, @@ -1683,8 +1707,7 @@ static void nvme_compare_cb(void *opaque, int ret) buf = g_malloc(ctx->iov.size); - status = nvme_dma(nvme_ctrl(req), buf, ctx->iov.size, - DMA_DIRECTION_TO_DEVICE, req); + status = nvme_h2c(nvme_ctrl(req), buf, ctx->iov.size, req); if (status) { req->status = status; goto out; @@ -1720,8 +1743,7 @@ static uint16_t nvme_dsm(NvmeCtrl *n, NvmeRequest *req) NvmeDsmRange range[nr]; uintptr_t *discards = (uintptr_t *)&req->opaque; - status = nvme_dma(n, (uint8_t *)range, sizeof(range), - DMA_DIRECTION_TO_DEVICE, req); + status = nvme_h2c(n, (uint8_t *)range, sizeof(range), req); if (status) { return status; } @@ -1803,8 +1825,8 @@ static uint16_t nvme_copy(NvmeCtrl *n, NvmeRequest *req) range = g_new(NvmeCopySourceRange, nr); - status = nvme_dma(n, (uint8_t *)range, nr * sizeof(NvmeCopySourceRange), - DMA_DIRECTION_TO_DEVICE, req); + status = nvme_h2c(n, (uint8_t *)range, nr * sizeof(NvmeCopySourceRange), + req); if (status) { return status; } @@ -2413,8 +2435,7 @@ static uint16_t nvme_zone_mgmt_send(NvmeCtrl *n, NvmeRequest *req) return NVME_INVALID_FIELD | NVME_DNR; } zd_ext = nvme_get_zd_extension(ns, zone_idx); - status = nvme_dma(n, zd_ext, ns->params.zd_extension_size, - DMA_DIRECTION_TO_DEVICE, req); + status = nvme_h2c(n, zd_ext, ns->params.zd_extension_size, req); if (status) { trace_pci_nvme_err_zd_extension_map_error(zone_idx); return status; @@ -2569,8 +2590,7 @@ static uint16_t nvme_zone_mgmt_recv(NvmeCtrl *n, NvmeRequest *req) } } - status = nvme_dma(n, (uint8_t *)buf, data_size, - DMA_DIRECTION_FROM_DEVICE, req); + status = nvme_c2h(n, (uint8_t *)buf, data_size, req); g_free(buf); @@ -2814,8 +2834,7 @@ static uint16_t nvme_smart_info(NvmeCtrl *n, uint8_t rae, uint32_t buf_len, nvme_clear_events(n, NVME_AER_TYPE_SMART); } - return nvme_dma(n, (uint8_t *) &smart + off, trans_len, - DMA_DIRECTION_FROM_DEVICE, req); + return nvme_c2h(n, (uint8_t *) &smart + off, trans_len, req); } static uint16_t nvme_fw_log_info(NvmeCtrl *n, uint32_t buf_len, uint64_t off, @@ -2833,8 +2852,7 @@ static uint16_t nvme_fw_log_info(NvmeCtrl *n, uint32_t buf_len, uint64_t off, strpadcpy((char *)&fw_log.frs1, sizeof(fw_log.frs1), "1.0", ' '); trans_len = MIN(sizeof(fw_log) - off, buf_len); - return nvme_dma(n, (uint8_t *) &fw_log + off, trans_len, - DMA_DIRECTION_FROM_DEVICE, req); + return nvme_c2h(n, (uint8_t *) &fw_log + off, trans_len, req); } static uint16_t nvme_error_info(NvmeCtrl *n, uint8_t rae, uint32_t buf_len, @@ -2854,8 +2872,7 @@ static uint16_t nvme_error_info(NvmeCtrl *n, uint8_t rae, uint32_t buf_len, memset(&errlog, 0x0, sizeof(errlog)); trans_len = MIN(sizeof(errlog) - off, buf_len); - return nvme_dma(n, (uint8_t *)&errlog, trans_len, - DMA_DIRECTION_FROM_DEVICE, req); + return nvme_c2h(n, (uint8_t *)&errlog, trans_len, req); } static uint16_t nvme_cmd_effects(NvmeCtrl *n, uint8_t csi, uint32_t buf_len, @@ -2895,8 +2912,7 @@ static uint16_t nvme_cmd_effects(NvmeCtrl *n, uint8_t csi, uint32_t buf_len, trans_len = MIN(sizeof(log) - off, buf_len); - return nvme_dma(n, ((uint8_t *)&log) + off, trans_len, - DMA_DIRECTION_FROM_DEVICE, req); + return nvme_c2h(n, ((uint8_t *)&log) + off, trans_len, req); } static uint16_t nvme_get_log(NvmeCtrl *n, NvmeRequest *req) @@ -3066,7 +3082,7 @@ static uint16_t nvme_rpt_empty_id_struct(NvmeCtrl *n, NvmeRequest *req) { uint8_t id[NVME_IDENTIFY_DATA_SIZE] = {}; - return nvme_dma(n, id, sizeof(id), DMA_DIRECTION_FROM_DEVICE, req); + return nvme_c2h(n, id, sizeof(id), req); } static inline bool nvme_csi_has_nvm_support(NvmeNamespace *ns) @@ -3083,8 +3099,7 @@ static uint16_t nvme_identify_ctrl(NvmeCtrl *n, NvmeRequest *req) { trace_pci_nvme_identify_ctrl(); - return nvme_dma(n, (uint8_t *)&n->id_ctrl, sizeof(n->id_ctrl), - DMA_DIRECTION_FROM_DEVICE, req); + return nvme_c2h(n, (uint8_t *)&n->id_ctrl, sizeof(n->id_ctrl), req); } static uint16_t nvme_identify_ctrl_csi(NvmeCtrl *n, NvmeRequest *req) @@ -3100,8 +3115,7 @@ static uint16_t nvme_identify_ctrl_csi(NvmeCtrl *n, NvmeRequest *req) if (n->params.zasl_bs) { id.zasl = n->zasl; } - return nvme_dma(n, (uint8_t *)&id, sizeof(id), - DMA_DIRECTION_FROM_DEVICE, req); + return nvme_c2h(n, (uint8_t *)&id, sizeof(id), req); } return NVME_INVALID_FIELD | NVME_DNR; @@ -3125,8 +3139,7 @@ static uint16_t nvme_identify_ns(NvmeCtrl *n, NvmeRequest *req) } if (c->csi == NVME_CSI_NVM && nvme_csi_has_nvm_support(ns)) { - return nvme_dma(n, (uint8_t *)&ns->id_ns, sizeof(NvmeIdNs), - DMA_DIRECTION_FROM_DEVICE, req); + return nvme_c2h(n, (uint8_t *)&ns->id_ns, sizeof(NvmeIdNs), req); } return NVME_INVALID_CMD_SET | NVME_DNR; @@ -3152,8 +3165,8 @@ static uint16_t nvme_identify_ns_csi(NvmeCtrl *n, NvmeRequest *req) if (c->csi == NVME_CSI_NVM && nvme_csi_has_nvm_support(ns)) { return nvme_rpt_empty_id_struct(n, req); } else if (c->csi == NVME_CSI_ZONED && ns->csi == NVME_CSI_ZONED) { - return nvme_dma(n, (uint8_t *)ns->id_ns_zoned, sizeof(NvmeIdNsZoned), - DMA_DIRECTION_FROM_DEVICE, req); + return nvme_c2h(n, (uint8_t *)ns->id_ns_zoned, sizeof(NvmeIdNsZoned), + req); } return NVME_INVALID_FIELD | NVME_DNR; @@ -3195,7 +3208,7 @@ static uint16_t nvme_identify_nslist(NvmeCtrl *n, NvmeRequest *req) } } - return nvme_dma(n, list, data_len, DMA_DIRECTION_FROM_DEVICE, req); + return nvme_c2h(n, list, data_len, req); } static uint16_t nvme_identify_nslist_csi(NvmeCtrl *n, NvmeRequest *req) @@ -3235,7 +3248,7 @@ static uint16_t nvme_identify_nslist_csi(NvmeCtrl *n, NvmeRequest *req) } } - return nvme_dma(n, list, data_len, DMA_DIRECTION_FROM_DEVICE, req); + return nvme_c2h(n, list, data_len, req); } static uint16_t nvme_identify_ns_descr_list(NvmeCtrl *n, NvmeRequest *req) @@ -3282,7 +3295,7 @@ static uint16_t nvme_identify_ns_descr_list(NvmeCtrl *n, NvmeRequest *req) ns_descrs->csi.hdr.nidl = NVME_NIDL_CSI; ns_descrs->csi.v = ns->csi; - return nvme_dma(n, list, sizeof(list), DMA_DIRECTION_FROM_DEVICE, req); + return nvme_c2h(n, list, sizeof(list), req); } static uint16_t nvme_identify_cmd_set(NvmeCtrl *n, NvmeRequest *req) @@ -3295,7 +3308,7 @@ static uint16_t nvme_identify_cmd_set(NvmeCtrl *n, NvmeRequest *req) NVME_SET_CSI(*list, NVME_CSI_NVM); NVME_SET_CSI(*list, NVME_CSI_ZONED); - return nvme_dma(n, list, data_len, DMA_DIRECTION_FROM_DEVICE, req); + return nvme_c2h(n, list, data_len, req); } static uint16_t nvme_identify(NvmeCtrl *n, NvmeRequest *req) @@ -3384,8 +3397,7 @@ static uint16_t nvme_get_feature_timestamp(NvmeCtrl *n, NvmeRequest *req) { uint64_t timestamp = nvme_get_timestamp(n); - return nvme_dma(n, (uint8_t *)×tamp, sizeof(timestamp), - DMA_DIRECTION_FROM_DEVICE, req); + return nvme_c2h(n, (uint8_t *)×tamp, sizeof(timestamp), req); } static uint16_t nvme_get_feature(NvmeCtrl *n, NvmeRequest *req) @@ -3545,8 +3557,7 @@ static uint16_t nvme_set_feature_timestamp(NvmeCtrl *n, NvmeRequest *req) uint16_t ret; uint64_t timestamp; - ret = nvme_dma(n, (uint8_t *)×tamp, sizeof(timestamp), - DMA_DIRECTION_TO_DEVICE, req); + ret = nvme_h2c(n, (uint8_t *)×tamp, sizeof(timestamp), req); if (ret) { return ret; } -- 2.30.0