NVMe has a limit on how many sectors it can handle at most within a single request. Remember that number, so that in a follow-up patch, we can verify that we don't exceed it.
Signed-off-by: Alexander Graf graf@amazon.com --- src/hw/nvme-int.h | 8 +++++++- src/hw/nvme.c | 13 +++++++++++-- 2 files changed, 18 insertions(+), 3 deletions(-)
diff --git a/src/hw/nvme-int.h b/src/hw/nvme-int.h index 9f95dd8..674008a 100644 --- a/src/hw/nvme-int.h +++ b/src/hw/nvme-int.h @@ -117,6 +117,7 @@ struct nvme_namespace {
u32 block_size; u32 metadata_size; + u32 max_req_size;
/* Page aligned buffer of size NVME_PAGE_SIZE. */ char *dma_buffer; @@ -131,7 +132,12 @@ struct nvme_identify_ctrl { char mn[40]; char fr[8];
- char _boring[516 - 72]; + u8 rab; + u8 ieee[3]; + u8 cmic; + u8 mdts; + + char _boring[516 - 78];
u32 nn; /* number of namespaces */ }; diff --git a/src/hw/nvme.c b/src/hw/nvme.c index 6a01204..2cde6a7 100644 --- a/src/hw/nvme.c +++ b/src/hw/nvme.c @@ -238,7 +238,8 @@ nvme_admin_identify_ns(struct nvme_ctrl *ctrl, u32 ns_id) }
static void -nvme_probe_ns(struct nvme_ctrl *ctrl, struct nvme_namespace *ns, u32 ns_id) +nvme_probe_ns(struct nvme_ctrl *ctrl, struct nvme_namespace *ns, u32 ns_id, + u8 mdts) { ns->ctrl = ctrl; ns->ns_id = ns_id; @@ -281,6 +282,14 @@ nvme_probe_ns(struct nvme_ctrl *ctrl, struct nvme_namespace *ns, u32 ns_id) ns->drive.blksize = ns->block_size; ns->drive.sectors = ns->lba_count;
+ if (mdts) { + ns->max_req_size = 1U << mdts; + dprintf(3, "NVME NS %u max request size: %d sectors\n", + ns->max_req_size); + } else { + ns->max_req_size = -1U; + } + ns->dma_buffer = zalloc_page_aligned(&ZoneHigh, NVME_PAGE_SIZE);
char *desc = znprintf(MAXDESCSIZE, "NVMe NS %u: %llu MiB (%llu %u-byte " @@ -567,7 +576,7 @@ nvme_controller_enable(struct nvme_ctrl *ctrl) /* Populate namespace IDs */ int ns_idx; for (ns_idx = 0; ns_idx < ctrl->ns_count; ns_idx++) { - nvme_probe_ns(ctrl, &ctrl->ns[ns_idx], ns_idx + 1); + nvme_probe_ns(ctrl, &ctrl->ns[ns_idx], ns_idx + 1, identify->mdts); }
dprintf(3, "NVMe initialization complete!\n");