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[Qemu-block] [PATCH 2/2] nvme: properly report volatile write caches
From: |
Christoph Hellwig |
Subject: |
[Qemu-block] [PATCH 2/2] nvme: properly report volatile write caches |
Date: |
Thu, 11 Jun 2015 12:01:39 +0200 |
Implement support in Identify and Get/Set Features to properly report
and allow to change the Volatile Write Cache status reported by the
virtual NVMe device.
Signed-off-by: Christoph Hellwig <address@hidden>
---
hw/block/nvme.c | 18 +++++++++++++-----
1 file changed, 13 insertions(+), 5 deletions(-)
diff --git a/hw/block/nvme.c b/hw/block/nvme.c
index 6c654d3..49941f3 100644
--- a/hw/block/nvme.c
+++ b/hw/block/nvme.c
@@ -485,26 +485,32 @@ static uint16_t nvme_identify(NvmeCtrl *n, NvmeCmd *cmd)
static uint16_t nvme_get_feature(NvmeCtrl *n, NvmeCmd *cmd, NvmeRequest *req)
{
uint32_t dw10 = le32_to_cpu(cmd->cdw10);
+ uint32_t result;
switch (dw10) {
- case NVME_NUMBER_OF_QUEUES:
- req->cqe.result =
- cpu_to_le32((n->num_queues - 1) | ((n->num_queues - 1) << 16));
- break;
case NVME_VOLATILE_WRITE_CACHE:
- req->cqe.result = cpu_to_le32(1);
+ result = blk_enable_write_cache(n->conf.blk);
+ break;
+ case NVME_NUMBER_OF_QUEUES:
+ result = cpu_to_le32((n->num_queues - 1) | ((n->num_queues - 1) <<
16));
break;
default:
return NVME_INVALID_FIELD | NVME_DNR;
}
+
+ req->cqe.result = result;
return NVME_SUCCESS;
}
static uint16_t nvme_set_feature(NvmeCtrl *n, NvmeCmd *cmd, NvmeRequest *req)
{
uint32_t dw10 = le32_to_cpu(cmd->cdw10);
+ uint32_t dw11 = le32_to_cpu(cmd->cdw11);
switch (dw10) {
+ case NVME_VOLATILE_WRITE_CACHE:
+ blk_set_enable_write_cache(n->conf.blk, dw11 & 1);
+ break;
case NVME_NUMBER_OF_QUEUES:
req->cqe.result =
cpu_to_le32((n->num_queues - 1) | ((n->num_queues - 1) << 16));
@@ -829,6 +835,8 @@ static int nvme_init(PCIDevice *pci_dev)
id->psd[0].mp = cpu_to_le16(0x9c4);
id->psd[0].enlat = cpu_to_le32(0x10);
id->psd[0].exlat = cpu_to_le32(0x4);
+ if (blk_enable_write_cache(n->conf.blk))
+ id->vwc = 1;
n->bar.cap = 0;
NVME_CAP_SET_MQES(n->bar.cap, 0x7ff);
--
1.9.1