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nvme-pci: implement the HMB entry number and size limitations

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Adds support for the new Host Memory Buffer Minimum Descriptor Entry Size
and Host Memory Maximum Descriptors Entries field that were added in
TP 4002 HMB Enhancements.  These allow the controller to advertise
limits for the usual number of segments in the host memory buffer, as
well as a minimum usable per-segment size.

Signed-off-by: Christoph Hellwig <[email protected]>
Reviewed-by: Keith Busch <[email protected]>
This commit is contained in:
Christoph Hellwig 2017-09-11 12:09:28 -04:00
commit 044a9df1a7
4 changed files with 13 additions and 2 deletions
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2
drivers/nvme/host/core.c
View file

@ -1897,6 +1897,8 @@ int nvme_init_identify(struct nvme_ctrl *ctrl)
ctrl->cntlid = le16_to_cpu(id->cntlid);
ctrl->hmpre = le32_to_cpu(id->hmpre);
ctrl->hmmin = le32_to_cpu(id->hmmin);
ctrl->hmminds = le32_to_cpu(id->hmminds);
ctrl->hmmaxd = le16_to_cpu(id->hmmaxd);
}
kfree(id);

3
drivers/nvme/host/nvme.h
View file

@ -181,8 +181,11 @@ struct nvme_ctrl {
u64 ps_max_latency_us;
bool apst_enabled;
/* PCIe only: */
u32 hmpre;
u32 hmmin;
u32 hmminds;
u16 hmmaxd;
/* Fabrics only */
u16 sqsize;

6
drivers/nvme/host/pci.c
View file

@ -1625,6 +1625,10 @@ static int __nvme_alloc_host_mem(struct nvme_dev *dev, u64 preferred,
tmp = (preferred + chunk_size - 1);
do_div(tmp, chunk_size);
max_entries = tmp;
if (dev->ctrl.hmmaxd && dev->ctrl.hmmaxd < max_entries)
max_entries = dev->ctrl.hmmaxd;
descs = dma_zalloc_coherent(dev->dev, max_entries * sizeof(*descs),
&descs_dma, GFP_KERNEL);
if (!descs)
@ -1681,7 +1685,7 @@ static int nvme_alloc_host_mem(struct nvme_dev *dev, u64 min, u64 preferred)
/* start big and work our way down */
for (chunk_size = min_t(u64, preferred, PAGE_SIZE * MAX_ORDER_NR_PAGES);
chunk_size >= PAGE_SIZE * 2;
chunk_size >= max_t(u32, dev->ctrl.hmminds * 4096, PAGE_SIZE * 2);
chunk_size /= 2) {
if (!__nvme_alloc_host_mem(dev, preferred, chunk_size)) {
if (!min || dev->host_mem_size >= min)