From 2605257a26b873eb8a0917391063df9c7ed7a976 Mon Sep 17 00:00:00 2001
From: Klaus Jensen <k.jensen@samsung.com>
Date: Wed, 21 Oct 2020 14:03:19 +0200
Subject: hw/block/nvme: add the dataset management command
Add support for the Dataset Management command and the Deallocate
attribute. Deallocation results in discards being sent to the underlying
block device. Whether of not the blocks are actually deallocated is
affected by the same factors as Write Zeroes (see previous commit).
format | discard | dsm (512B) dsm (4KiB) dsm (64KiB)
--------------------------------------------------------
qcow2 ignore n n n
qcow2 unmap n n y
raw ignore n n n
raw unmap n y y
Again, a raw format and 4KiB LBAs are preferable.
In order to set the Namespace Preferred Deallocate Granularity and
Alignment fields (NPDG and NPDA), choose a sane minimum discard
granularity of 4KiB. If we are using a passthru device supporting
discard at a 512B granularity, user should set the discard_granularity
property explicitly. NPDG and NPDA will also account for the
cluster_size of the block driver if required (i.e. for QCOW2).
See NVM Express 1.3d, Section 6.7 ("Dataset Management command").
Signed-off-by: Klaus Jensen <k.jensen@samsung.com>
Reviewed-by: Keith Busch <kbusch@kernel.org>
---
hw/block/nvme.h | 2 ++
1 file changed, 2 insertions(+)
(limited to 'hw/block/nvme.h')
diff --git a/hw/block/nvme.h b/hw/block/nvme.h
index e080a2318a..574333caa3 100644
--- a/hw/block/nvme.h
+++ b/hw/block/nvme.h
@@ -28,6 +28,7 @@ typedef struct NvmeRequest {
struct NvmeNamespace *ns;
BlockAIOCB *aiocb;
uint16_t status;
+ void *opaque;
NvmeCqe cqe;
NvmeCmd cmd;
BlockAcctCookie acct;
@@ -60,6 +61,7 @@ static inline const char *nvme_io_opc_str(uint8_t opc)
case NVME_CMD_WRITE: return "NVME_NVM_CMD_WRITE";
case NVME_CMD_READ: return "NVME_NVM_CMD_READ";
case NVME_CMD_WRITE_ZEROES: return "NVME_NVM_CMD_WRITE_ZEROES";
+ case NVME_CMD_DSM: return "NVME_NVM_CMD_DSM";
default: return "NVME_NVM_CMD_UNKNOWN";
}
}
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