nvme: Record maximum allowed request size
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>
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@ -117,6 +117,7 @@ struct nvme_namespace {
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u32 block_size;
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u32 metadata_size;
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u32 max_req_size;
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/* Page aligned buffer of size NVME_PAGE_SIZE. */
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char *dma_buffer;
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@ -131,7 +132,12 @@ struct nvme_identify_ctrl {
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char mn[40];
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char fr[8];
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char _boring[516 - 72];
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u8 rab;
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u8 ieee[3];
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u8 cmic;
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u8 mdts;
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char _boring[516 - 78];
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u32 nn; /* number of namespaces */
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};
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@ -238,7 +238,8 @@ nvme_admin_identify_ns(struct nvme_ctrl *ctrl, u32 ns_id)
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}
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static void
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nvme_probe_ns(struct nvme_ctrl *ctrl, struct nvme_namespace *ns, u32 ns_id)
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nvme_probe_ns(struct nvme_ctrl *ctrl, struct nvme_namespace *ns, u32 ns_id,
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u8 mdts)
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{
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ns->ctrl = ctrl;
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ns->ns_id = ns_id;
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@ -281,6 +282,14 @@ nvme_probe_ns(struct nvme_ctrl *ctrl, struct nvme_namespace *ns, u32 ns_id)
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ns->drive.blksize = ns->block_size;
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ns->drive.sectors = ns->lba_count;
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if (mdts) {
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ns->max_req_size = ((1U << mdts) * NVME_PAGE_SIZE) / ns->block_size;
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dprintf(3, "NVME NS %u max request size: %d sectors\n",
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ns_id, ns->max_req_size);
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} else {
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ns->max_req_size = -1U;
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}
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ns->dma_buffer = zalloc_page_aligned(&ZoneHigh, NVME_PAGE_SIZE);
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char *desc = znprintf(MAXDESCSIZE, "NVMe NS %u: %llu MiB (%llu %u-byte "
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@ -567,7 +576,7 @@ nvme_controller_enable(struct nvme_ctrl *ctrl)
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/* Populate namespace IDs */
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int ns_idx;
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for (ns_idx = 0; ns_idx < ctrl->ns_count; ns_idx++) {
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nvme_probe_ns(ctrl, &ctrl->ns[ns_idx], ns_idx + 1);
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nvme_probe_ns(ctrl, &ctrl->ns[ns_idx], ns_idx + 1, identify->mdts);
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}
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dprintf(3, "NVMe initialization complete!\n");
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