[PULL 06/10] hw/nvme: be compliant wrt. dsm processing limits

[Klaus Jensen <its@irrelevant.dk>]

From: Klaus Jensen <k.jensen@samsung.com>

The specification states that,

> The controller shall set all three processing limit fields (i.e., the
> DMRL, DMRSL and DMSL fields) to non-zero values or shall clear all
> three processing limit fields to 0h.

So, set the DMRL and DMSL fields in addition to DMRSL.

Reviewed-by: Jesper Wendel Devantier <foss@defmacro.it>
Signed-off-by: Klaus Jensen <k.jensen@samsung.com>
---
 hw/nvme/ctrl.c       | 24 +++++++++++++++---------
 include/block/nvme.h |  2 ++
 2 files changed, 17 insertions(+), 9 deletions(-)

diff --git a/hw/nvme/ctrl.c b/hw/nvme/ctrl.c
index 2b73f601608f..86e1c48fab82 100644
--- a/hw/nvme/ctrl.c
+++ b/hw/nvme/ctrl.c
@@ -5639,7 +5639,9 @@ static uint16_t nvme_identify_ctrl_csi(NvmeCtrl *n, NvmeRequest *req)
     switch (c->csi) {
     case NVME_CSI_NVM:
         id_nvm->vsl = n->params.vsl;
+        id_nvm->dmrl = NVME_ID_CTRL_NVM_DMRL_MAX;
         id_nvm->dmrsl = cpu_to_le32(n->dmrsl);
+        id_nvm->dmsl = NVME_ID_CTRL_NVM_DMRL_MAX * n->dmrsl;
         break;
 
     case NVME_CSI_ZONED:
@@ -6696,18 +6698,23 @@ static uint16_t nvme_aer(NvmeCtrl *n, NvmeRequest *req)
     return NVME_NO_COMPLETE;
 }
 
-static void nvme_update_dmrsl(NvmeCtrl *n)
+static void nvme_update_dsm_limits(NvmeCtrl *n, NvmeNamespace *ns)
 {
-    int nsid;
+    if (ns) {
+        n->dmrsl =
+            MIN_NON_ZERO(n->dmrsl, BDRV_REQUEST_MAX_BYTES / nvme_l2b(ns, 1));
 
-    for (nsid = 1; nsid <= NVME_MAX_NAMESPACES; nsid++) {
-        NvmeNamespace *ns = nvme_ns(n, nsid);
+        return;
+    }
+
+    for (uint32_t nsid = 1; nsid <= NVME_MAX_NAMESPACES; nsid++) {
+        ns = nvme_ns(n, nsid);
         if (!ns) {
             continue;
         }
 
-        n->dmrsl = MIN_NON_ZERO(n->dmrsl,
-                                BDRV_REQUEST_MAX_BYTES / nvme_l2b(ns, 1));
+        n->dmrsl =
+            MIN_NON_ZERO(n->dmrsl, BDRV_REQUEST_MAX_BYTES / nvme_l2b(ns, 1));
     }
 }
 
@@ -6795,7 +6802,7 @@ static uint16_t nvme_ns_attachment(NvmeCtrl *n, NvmeRequest *req)
             ctrl->namespaces[nsid] = NULL;
             ns->attached--;
 
-            nvme_update_dmrsl(ctrl);
+            nvme_update_dsm_limits(ctrl, NULL);
 
             break;
 
@@ -8902,8 +8909,7 @@ void nvme_attach_ns(NvmeCtrl *n, NvmeNamespace *ns)
     n->namespaces[nsid] = ns;
     ns->attached++;
 
-    n->dmrsl = MIN_NON_ZERO(n->dmrsl,
-                            BDRV_REQUEST_MAX_BYTES / nvme_l2b(ns, 1));
+    nvme_update_dsm_limits(n, ns);
 }
 
 static void nvme_realize(PCIDevice *pci_dev, Error **errp)
diff --git a/include/block/nvme.h b/include/block/nvme.h
index aecfc9ce66b4..763b2b2f0ec7 100644
--- a/include/block/nvme.h
+++ b/include/block/nvme.h
@@ -1207,6 +1207,8 @@ typedef struct NvmeIdCtrlZoned {
     uint8_t     rsvd1[4095];
 } NvmeIdCtrlZoned;
 
+#define NVME_ID_CTRL_NVM_DMRL_MAX 255
+
 typedef struct NvmeIdCtrlNvm {
     uint8_t     vsl;
     uint8_t     wzsl;
-- 
2.47.2