diff options
Diffstat (limited to 'drivers/nvme')
| -rw-r--r-- | drivers/nvme/nvme.c | 25 |
1 files changed, 20 insertions, 5 deletions
diff --git a/drivers/nvme/nvme.c b/drivers/nvme/nvme.c index c9efeff4bc..c61dab20c5 100644 --- a/drivers/nvme/nvme.c +++ b/drivers/nvme/nvme.c @@ -489,6 +489,7 @@ int nvme_get_features(struct nvme_dev *dev, unsigned fid, unsigned nsid, dma_addr_t dma_addr, u32 *result) { struct nvme_command c; + int ret; memset(&c, 0, sizeof(c)); c.features.opcode = nvme_admin_get_features; @@ -496,12 +497,20 @@ int nvme_get_features(struct nvme_dev *dev, unsigned fid, unsigned nsid, c.features.prp1 = cpu_to_le64(dma_addr); c.features.fid = cpu_to_le32(fid); + ret = nvme_submit_admin_cmd(dev, &c, result); + /* - * TODO: add cache invalidate operation when the size of - * the DMA buffer is known + * TODO: Add some cache invalidation when a DMA buffer is involved + * in the request, here and before the command gets submitted. The + * buffer size varies by feature, also some features use a different + * field in the command packet to hold the buffer address. + * Section 5.21.1 (Set Features command) in the NVMe specification + * details the buffer requirements for each feature. + * + * At the moment there is no user of this function. */ - return nvme_submit_admin_cmd(dev, &c, result); + return ret; } int nvme_set_features(struct nvme_dev *dev, unsigned fid, unsigned dword11, @@ -516,8 +525,14 @@ int nvme_set_features(struct nvme_dev *dev, unsigned fid, unsigned dword11, c.features.dword11 = cpu_to_le32(dword11); /* - * TODO: add cache flush operation when the size of - * the DMA buffer is known + * TODO: Add a cache clean (aka flush) operation when a DMA buffer is + * involved in the request. The buffer size varies by feature, also + * some features use a different field in the command packet to hold + * the buffer address. Section 5.21.1 (Set Features command) in the + * NVMe specification details the buffer requirements for each + * feature. + * At the moment the only user of this function is not using + * any DMA buffer at all. */ return nvme_submit_admin_cmd(dev, &c, result); |