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List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Fam Zheng , Kevin Wolf , Paolo Bonzini , qemu-block@nongnu.org, Max Reitz Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Archived-At: List-Archive: On 8/25/19 3:15 AM, Maxim Levitsky wrote: > Signed-off-by: Maxim Levitsky > --- > block/nvme.c | 83 ++++++++++++++++++++++++++++++++++++++++++++++ > block/trace-events | 2 ++ > 2 files changed, 85 insertions(+) > > diff --git a/block/nvme.c b/block/nvme.c > index f8bd11e19a..dd041f39c9 100644 > --- a/block/nvme.c > +++ b/block/nvme.c > @@ -112,6 +112,7 @@ typedef struct { > bool plugged; > > bool supports_write_zeros; > + bool supports_discard; > > CoMutex dma_map_lock; > CoQueue dma_flush_queue; > @@ -463,6 +464,7 @@ static void nvme_identify(BlockDriverState *bs, int namespace, Error **errp) > > oncs = le16_to_cpu(idctrl->oncs); > s->supports_write_zeros = (oncs & NVME_ONCS_WRITE_ZEROS) != 0; > + s->supports_discard = (oncs & NVME_ONCS_DSM) != 0; Same comment -- checking !!(register & FIELD) is nicer than the negative. (I'm actually not sure even the !! is needed, but it seems to be a QEMU-ism and I've caught myself using it...) Rest looks good to me on a skim, but I'm not very well-versed in NVME. > > memset(resp, 0, 4096); > > @@ -1153,6 +1155,86 @@ static coroutine_fn int nvme_co_pwrite_zeroes(BlockDriverState *bs, > } > > > +static int coroutine_fn nvme_co_pdiscard(BlockDriverState *bs, > + int64_t offset, > + int bytes) > +{ > + BDRVNVMeState *s = bs->opaque; > + NVMeQueuePair *ioq = s->queues[1]; > + NVMeRequest *req; > + NvmeDsmRange *buf; > + QEMUIOVector local_qiov; > + int ret; > + > + NvmeCmd cmd = { > + .opcode = NVME_CMD_DSM, > + .nsid = cpu_to_le32(s->nsid), > + .cdw10 = cpu_to_le32(0), /*number of ranges - 0 based*/ > + .cdw11 = cpu_to_le32(1 << 2), /*deallocate bit*/ > + }; > + > + NVMeCoData data = { > + .ctx = bdrv_get_aio_context(bs), > + .ret = -EINPROGRESS, > + }; > + > + if (!s->supports_discard) { > + return -ENOTSUP; > + } > + > + assert(s->nr_queues > 1); > + > + buf = qemu_try_blockalign0(bs, s->page_size); > + if (!buf) { > + return -ENOMEM; > + } > + > + buf->nlb = cpu_to_le32(bytes >> s->blkshift); > + buf->slba = cpu_to_le64(offset >> s->blkshift); > + buf->cattr = 0; > + > + qemu_iovec_init(&local_qiov, 1); > + qemu_iovec_add(&local_qiov, buf, 4096); > + > + req = nvme_get_free_req(ioq); > + assert(req); > + > + qemu_co_mutex_lock(&s->dma_map_lock); > + ret = nvme_cmd_map_qiov(bs, &cmd, req, &local_qiov); > + qemu_co_mutex_unlock(&s->dma_map_lock); > + > + if (ret) { > + req->busy = false; > + goto out; > + } > + > + trace_nvme_dsm(s, offset, bytes); > + > + nvme_submit_command(s, ioq, req, &cmd, nvme_rw_cb, &data); > + > + data.co = qemu_coroutine_self(); > + while (data.ret == -EINPROGRESS) { > + qemu_coroutine_yield(); > + } > + > + qemu_co_mutex_lock(&s->dma_map_lock); > + ret = nvme_cmd_unmap_qiov(bs, &local_qiov); > + qemu_co_mutex_unlock(&s->dma_map_lock); > + > + if (ret) { > + goto out; > + } > + > + ret = data.ret; > + trace_nvme_dsm_done(s, offset, bytes, ret); > +out: > + qemu_iovec_destroy(&local_qiov); > + qemu_vfree(buf); > + return ret; > + > +} > + > + > static int nvme_reopen_prepare(BDRVReopenState *reopen_state, > BlockReopenQueue *queue, Error **errp) > { > @@ -1259,6 +1341,7 @@ static BlockDriver bdrv_nvme = { > .bdrv_co_pwritev = nvme_co_pwritev, > > .bdrv_co_pwrite_zeroes = nvme_co_pwrite_zeroes, > + .bdrv_co_pdiscard = nvme_co_pdiscard, > > .bdrv_co_flush_to_disk = nvme_co_flush, > .bdrv_reopen_prepare = nvme_reopen_prepare, > diff --git a/block/trace-events b/block/trace-events > index 8209fbd0c7..7d1d48b502 100644 > --- a/block/trace-events > +++ b/block/trace-events > @@ -153,6 +153,8 @@ nvme_write_zeros(void *s, uint64_t offset, uint64_t bytes, int flags) "s %p offs > nvme_qiov_unaligned(const void *qiov, int n, void *base, size_t size, int align) "qiov %p n %d base %p size 0x%zx align 0x%x" > nvme_prw_buffered(void *s, uint64_t offset, uint64_t bytes, int niov, int is_write) "s %p offset %"PRId64" bytes %"PRId64" niov %d is_write %d" > nvme_rw_done(void *s, int is_write, uint64_t offset, uint64_t bytes, int ret) "s %p is_write %d offset %"PRId64" bytes %"PRId64" ret %d" > +nvme_dsm(void *s, uint64_t offset, uint64_t bytes) "s %p offset %"PRId64" bytes %"PRId64"" > +nvme_dsm_done(void *s, uint64_t offset, uint64_t bytes, int ret) "s %p offset %"PRId64" bytes %"PRId64" ret %d" > nvme_dma_map_flush(void *s) "s %p" > nvme_free_req_queue_wait(void *q) "q %p" > nvme_cmd_map_qiov(void *s, void *cmd, void *req, void *qiov, int entries) "s %p cmd %p req %p qiov %p entries %d" >