diff options
| author | Keith Busch <keith.busch@intel.com> | 2013-04-25 01:44:24 +0400 |
|---|---|---|
| committer | Matthew Wilcox <matthew.r.wilcox@intel.com> | 2013-05-02 22:32:08 +0400 |
| commit | ec5037335064dcc52c2fbbf3d505bae0eb27e713 (patch) | |
| tree | 6106acdb426250fb2e69e72efde4a86d78ffd1d8 /drivers/block/nvme-scsi.c | |
| parent | 14385de117882fa253954063d8b8d8a6bdeae650 (diff) | |
| download | linux-ec5037335064dcc52c2fbbf3d505bae0eb27e713.tar.xz | |
NVMe: Add scsi unmap to SG_IO
Translates a scsi unmap request from SG_IO ioctl to NVMe
data-set-management deallocate.
Signed-off-by: Keith Busch <keith.busch@intel.com>
Acked-by: Vishal Verma <vishal.l.verma@linux.intel.com>
Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com>
Diffstat (limited to 'drivers/block/nvme-scsi.c')
| -rw-r--r-- | drivers/block/nvme-scsi.c | 78 |
1 files changed, 78 insertions, 0 deletions
diff --git a/drivers/block/nvme-scsi.c b/drivers/block/nvme-scsi.c index fe2fcfff4c0f..1c0710ca55d6 100644 --- a/drivers/block/nvme-scsi.c +++ b/drivers/block/nvme-scsi.c @@ -100,6 +100,7 @@ static int sg_version_num = 30534; /* 2 digits for each component */ #define FORMAT_UNIT_PROT_INT_OFFSET 3 #define FORMAT_UNIT_PROT_FIELD_USAGE_OFFSET 0 #define FORMAT_UNIT_PROT_FIELD_USAGE_MASK 0x07 +#define UNMAP_CDB_PARAM_LIST_LENGTH_OFFSET 7 /* Misc. defines */ #define NIBBLE_SHIFT 4 @@ -2862,6 +2863,80 @@ static int nvme_trans_write_buffer(struct nvme_ns *ns, struct sg_io_hdr *hdr, return res; } +struct scsi_unmap_blk_desc { + __be64 slba; + __be32 nlb; + u32 resv; +}; + +struct scsi_unmap_parm_list { + __be16 unmap_data_len; + __be16 unmap_blk_desc_data_len; + u32 resv; + struct scsi_unmap_blk_desc desc[0]; +}; + +static int nvme_trans_unmap(struct nvme_ns *ns, struct sg_io_hdr *hdr, + u8 *cmd) +{ + struct nvme_dev *dev = ns->dev; + struct scsi_unmap_parm_list *plist; + struct nvme_dsm_range *range; + struct nvme_queue *nvmeq; + struct nvme_command c; + int i, nvme_sc, res = -ENOMEM; + u16 ndesc, list_len; + dma_addr_t dma_addr; + + list_len = GET_U16_FROM_CDB(cmd, UNMAP_CDB_PARAM_LIST_LENGTH_OFFSET); + if (!list_len) + return -EINVAL; + + plist = kmalloc(list_len, GFP_KERNEL); + if (!plist) + return -ENOMEM; + + res = nvme_trans_copy_from_user(hdr, plist, list_len); + if (res != SNTI_TRANSLATION_SUCCESS) + goto out; + + ndesc = be16_to_cpu(plist->unmap_blk_desc_data_len) >> 4; + if (!ndesc || ndesc > 256) { + res = -EINVAL; + goto out; + } + + range = dma_alloc_coherent(&dev->pci_dev->dev, ndesc * sizeof(*range), + &dma_addr, GFP_KERNEL); + if (!range) + goto out; + + for (i = 0; i < ndesc; i++) { + range[i].nlb = cpu_to_le32(be32_to_cpu(plist->desc[i].nlb)); + range[i].slba = cpu_to_le64(be64_to_cpu(plist->desc[i].slba)); + range[i].cattr = 0; + } + + memset(&c, 0, sizeof(c)); + c.dsm.opcode = nvme_cmd_dsm; + c.dsm.nsid = cpu_to_le32(ns->ns_id); + c.dsm.prp1 = cpu_to_le64(dma_addr); + c.dsm.nr = cpu_to_le32(ndesc - 1); + c.dsm.attributes = cpu_to_le32(NVME_DSMGMT_AD); + + nvmeq = get_nvmeq(dev); + put_nvmeq(nvmeq); + + nvme_sc = nvme_submit_sync_cmd(nvmeq, &c, NULL, NVME_IO_TIMEOUT); + res = nvme_trans_status_code(hdr, nvme_sc); + + dma_free_coherent(&dev->pci_dev->dev, ndesc * sizeof(*range), + range, dma_addr); + out: + kfree(plist); + return res; +} + static int nvme_scsi_translate(struct nvme_ns *ns, struct sg_io_hdr *hdr) { u8 cmd[BLK_MAX_CDB]; @@ -2936,6 +3011,9 @@ static int nvme_scsi_translate(struct nvme_ns *ns, struct sg_io_hdr *hdr) case WRITE_BUFFER: retcode = nvme_trans_write_buffer(ns, hdr, cmd); break; + case UNMAP: + retcode = nvme_trans_unmap(ns, hdr, cmd); + break; default: out: retcode = nvme_trans_completion(hdr, SAM_STAT_CHECK_CONDITION, |