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nvme: properly report volatile write caches 

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 <hch@lst.de>
Acked-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Christoph Hellwig 2015-06-11 12:01:39 +02:00 committed by Kevin Wolf
parent 8b9d74e0ee
commit 30349fd038
1 changed files with 14 additions and 5 deletions
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19
hw/block/nvme.c
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@ -487,26 +487,32 @@ 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));
@ -831,6 +837,9 @@ 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);