[PATCH v5 06/14] hw/block/nvme: Add support for active/inactive namespaces

[Dmitry Fomichev]

From: Niklas Cassel <niklas.cassel@wdc.com>

In NVMe, a namespace is active if it exists and is attached to the
controller.

CAP.CSS (together with the I/O Command Set data structure) defines what
command sets are supported by the controller.

CC.CSS (together with Set Profile) can be set to enable a subset of the
available command sets. The namespaces belonging to a disabled command set
will not be able to attach to the controller, and will thus be inactive.

E.g., if the user sets CC.CSS to Admin Only, NVM namespaces should be
marked as inactive.

The identify namespace, the identify namespace CSI specific, and the namespace
list commands have two different versions, one that only shows active
namespaces, and the other version that shows existing namespaces, regardless
of whether the namespace is attached or not.

Add an attached member to struct NvmeNamespace, and implement the missing CNS
commands.

The added functionality will also simplify the implementation of namespace
management in the future, since namespace management can also attach and
detach namespaces.

Signed-off-by: Niklas Cassel <niklas.cassel@wdc.com>
Signed-off-by: Dmitry Fomichev <dmitry.fomichev@wdc.com>
---
 hw/block/nvme-ns.h   |  1 +
 hw/block/nvme.c      | 60 ++++++++++++++++++++++++++++++++++++++------
 include/block/nvme.h | 20 +++++++++------
 3 files changed, 65 insertions(+), 16 deletions(-)

diff --git a/hw/block/nvme-ns.h b/hw/block/nvme-ns.h
index cca23bc0b3..acdb76f058 100644
--- a/hw/block/nvme-ns.h
+++ b/hw/block/nvme-ns.h
@@ -22,6 +22,7 @@
 typedef struct NvmeNamespaceParams {
     uint32_t nsid;
     uint8_t  csi;
+    bool     attached;
     QemuUUID uuid;
 } NvmeNamespaceParams;
 
diff --git a/hw/block/nvme.c b/hw/block/nvme.c
index 4ec1ddc90a..63ad03d6d6 100644
--- a/hw/block/nvme.c
+++ b/hw/block/nvme.c
@@ -1523,7 +1523,8 @@ static uint16_t nvme_identify_ctrl_csi(NvmeCtrl *n, 
NvmeRequest *req)
     return NVME_INVALID_FIELD | NVME_DNR;
 }
 
-static uint16_t nvme_identify_ns(NvmeCtrl *n, NvmeRequest *req)
+static uint16_t nvme_identify_ns(NvmeCtrl *n, NvmeRequest *req,
+                                 bool only_active)
 {
     NvmeNamespace *ns;
     NvmeIdentify *c = (NvmeIdentify *)&req->cmd;
@@ -1540,11 +1541,16 @@ static uint16_t nvme_identify_ns(NvmeCtrl *n, 
NvmeRequest *req)
         return nvme_rpt_empty_id_struct(n, req);
     }
 
+    if (only_active && !ns->params.attached) {
+        return nvme_rpt_empty_id_struct(n, req);
+    }
+
     return nvme_dma(n, (uint8_t *)&ns->id_ns, sizeof(NvmeIdNs),
                     DMA_DIRECTION_FROM_DEVICE, req);
 }
 
-static uint16_t nvme_identify_ns_csi(NvmeCtrl *n, NvmeRequest *req)
+static uint16_t nvme_identify_ns_csi(NvmeCtrl *n, NvmeRequest *req,
+                                     bool only_active)
 {
     NvmeNamespace *ns;
     NvmeIdentify *c = (NvmeIdentify *)&req->cmd;
@@ -1561,6 +1567,10 @@ static uint16_t nvme_identify_ns_csi(NvmeCtrl *n, 
NvmeRequest *req)
         return nvme_rpt_empty_id_struct(n, req);
     }
 
+    if (only_active && !ns->params.attached) {
+        return nvme_rpt_empty_id_struct(n, req);
+    }
+
     if (c->csi == NVME_CSI_NVM) {
         return nvme_rpt_empty_id_struct(n, req);
     }
@@ -1568,7 +1578,8 @@ static uint16_t nvme_identify_ns_csi(NvmeCtrl *n, 
NvmeRequest *req)
     return NVME_INVALID_FIELD | NVME_DNR;
 }
 
-static uint16_t nvme_identify_nslist(NvmeCtrl *n, NvmeRequest *req)
+static uint16_t nvme_identify_nslist(NvmeCtrl *n, NvmeRequest *req,
+                                     bool only_active)
 {
     NvmeNamespace *ns;
     NvmeIdentify *c = (NvmeIdentify *)&req->cmd;
@@ -1598,6 +1609,9 @@ static uint16_t nvme_identify_nslist(NvmeCtrl *n, 
NvmeRequest *req)
         if (ns->params.nsid < min_nsid) {
             continue;
         }
+        if (only_active && !ns->params.attached) {
+            continue;
+        }
         list_ptr[j++] = cpu_to_le32(ns->params.nsid);
         if (j == data_len / sizeof(uint32_t)) {
             break;
@@ -1607,7 +1621,8 @@ static uint16_t nvme_identify_nslist(NvmeCtrl *n, 
NvmeRequest *req)
     return nvme_dma(n, list, data_len, DMA_DIRECTION_FROM_DEVICE, req);
 }
 
-static uint16_t nvme_identify_nslist_csi(NvmeCtrl *n, NvmeRequest *req)
+static uint16_t nvme_identify_nslist_csi(NvmeCtrl *n, NvmeRequest *req,
+                                         bool only_active)
 {
     NvmeNamespace *ns;
     NvmeIdentify *c = (NvmeIdentify *)&req->cmd;
@@ -1631,6 +1646,9 @@ static uint16_t nvme_identify_nslist_csi(NvmeCtrl *n, 
NvmeRequest *req)
         if (ns->params.nsid < min_nsid) {
             continue;
         }
+        if (only_active && !ns->params.attached) {
+            continue;
+        }
         list_ptr[j++] = cpu_to_le32(ns->params.nsid);
         if (j == data_len / sizeof(uint32_t)) {
             break;
@@ -1700,17 +1718,25 @@ static uint16_t nvme_identify(NvmeCtrl *n, NvmeRequest 
*req)
 
     switch (le32_to_cpu(c->cns)) {
     case NVME_ID_CNS_NS:
-        return nvme_identify_ns(n, req);
+        return nvme_identify_ns(n, req, true);
     case NVME_ID_CNS_CS_NS:
-        return nvme_identify_ns_csi(n, req);
+        return nvme_identify_ns_csi(n, req, true);
+    case NVME_ID_CNS_NS_PRESENT:
+        return nvme_identify_ns(n, req, false);
+    case NVME_ID_CNS_CS_NS_PRESENT:
+        return nvme_identify_ns_csi(n, req, false);
     case NVME_ID_CNS_CTRL:
         return nvme_identify_ctrl(n, req);
     case NVME_ID_CNS_CS_CTRL:
         return nvme_identify_ctrl_csi(n, req);
     case NVME_ID_CNS_NS_ACTIVE_LIST:
-        return nvme_identify_nslist(n, req);
+        return nvme_identify_nslist(n, req, true);
     case NVME_ID_CNS_CS_NS_ACTIVE_LIST:
-        return nvme_identify_nslist_csi(n, req);
+        return nvme_identify_nslist_csi(n, req, true);
+    case NVME_ID_CNS_NS_PRESENT_LIST:
+        return nvme_identify_nslist(n, req, false);
+    case NVME_ID_CNS_CS_NS_PRESENT_LIST:
+        return nvme_identify_nslist_csi(n, req, false);
     case NVME_ID_CNS_NS_DESCR_LIST:
         return nvme_identify_ns_descr_list(n, req);
     case NVME_ID_CNS_IO_COMMAND_SET:
@@ -2188,8 +2214,10 @@ static void nvme_clear_ctrl(NvmeCtrl *n)
 
 static int nvme_start_ctrl(NvmeCtrl *n)
 {
+    NvmeNamespace *ns;
     uint32_t page_bits = NVME_CC_MPS(n->bar.cc) + 12;
     uint32_t page_size = 1 << page_bits;
+    int i;
 
     if (unlikely(n->cq[0])) {
         trace_pci_nvme_err_startfail_cq();
@@ -2276,6 +2304,22 @@ static int nvme_start_ctrl(NvmeCtrl *n)
     nvme_init_sq(&n->admin_sq, n, n->bar.asq, 0, 0,
                  NVME_AQA_ASQS(n->bar.aqa) + 1);
 
+    for (i = 1; i <= n->num_namespaces; i++) {
+        ns = nvme_ns(n, i);
+        if (!ns) {
+            continue;
+        }
+        ns->params.attached = false;
+        switch (ns->params.csi) {
+        case NVME_CSI_NVM:
+            if (NVME_CC_CSS(n->bar.cc) == CSS_NVM_ONLY ||
+                NVME_CC_CSS(n->bar.cc) == CSS_CSI) {
+                ns->params.attached = true;
+            }
+            break;
+        }
+    }
+
     nvme_set_timestamp(n, 0ULL);
 
     QTAILQ_INIT(&n->aer_queue);
diff --git a/include/block/nvme.h b/include/block/nvme.h
index 4587311783..b182fe40b2 100644
--- a/include/block/nvme.h
+++ b/include/block/nvme.h
@@ -804,14 +804,18 @@ typedef struct QEMU_PACKED NvmePSD {
 #define NVME_IDENTIFY_DATA_SIZE 4096
 
 enum NvmeIdCns {
-    NVME_ID_CNS_NS                = 0x00,
-    NVME_ID_CNS_CTRL              = 0x01,
-    NVME_ID_CNS_NS_ACTIVE_LIST    = 0x02,
-    NVME_ID_CNS_NS_DESCR_LIST     = 0x03,
-    NVME_ID_CNS_CS_NS             = 0x05,
-    NVME_ID_CNS_CS_CTRL           = 0x06,
-    NVME_ID_CNS_CS_NS_ACTIVE_LIST = 0x07,
-    NVME_ID_CNS_IO_COMMAND_SET    = 0x1c,
+    NVME_ID_CNS_NS                    = 0x00,
+    NVME_ID_CNS_CTRL                  = 0x01,
+    NVME_ID_CNS_NS_ACTIVE_LIST        = 0x02,
+    NVME_ID_CNS_NS_DESCR_LIST         = 0x03,
+    NVME_ID_CNS_CS_NS                 = 0x05,
+    NVME_ID_CNS_CS_CTRL               = 0x06,
+    NVME_ID_CNS_CS_NS_ACTIVE_LIST     = 0x07,
+    NVME_ID_CNS_NS_PRESENT_LIST       = 0x10,
+    NVME_ID_CNS_NS_PRESENT            = 0x11,
+    NVME_ID_CNS_CS_NS_PRESENT_LIST    = 0x1a,
+    NVME_ID_CNS_CS_NS_PRESENT         = 0x1b,
+    NVME_ID_CNS_IO_COMMAND_SET        = 0x1c,
 };
 
 typedef struct QEMU_PACKED NvmeIdCtrl {
-- 
2.21.0