hw/nvme: Add support for Secondary Controller List

Introduce handling for Secondary Controller List (Identify command with
CNS value of 15h).

Secondary controller ids are unique in the subsystem, hence they are
reserved by it upon initialization of the primary controller to the
number of sriov_max_vfs.

ID reservation requires the addition of an intermediate controller slot
state, so the reserved controller has the address 0xFFFF.
A secondary controller is in the reserved state when it has no virtual
function assigned, but its primary controller is realized.
Secondary controller reservations are released to NULL when its primary
controller is unregistered.

Signed-off-by: Lukasz Maniak <lukasz.maniak@linux.intel.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Klaus Jensen <k.jensen@samsung.com>
Signed-off-by: Klaus Jensen <k.jensen@samsung.com>

5 files changed, 121 insertions, 10 deletions

diff --git a/hw/nvme/ctrl.c b/hw/nvme/ctrl.c
index d004b48409..b031212758 100644
--- a/hw/nvme/ctrl.c
+++ b/hw/nvme/ctrl.c
@@ -4812,6 +4812,29 @@ static uint16_t nvme_identify_pri_ctrl_cap(NvmeCtrl *n, NvmeRequest *req)
                     sizeof(NvmePriCtrlCap), req);
 }
 
+static uint16_t nvme_identify_sec_ctrl_list(NvmeCtrl *n, NvmeRequest *req)
+{
+    NvmeIdentify *c = (NvmeIdentify *)&req->cmd;
+    uint16_t pri_ctrl_id = le16_to_cpu(n->pri_ctrl_cap.cntlid);
+    uint16_t min_id = le16_to_cpu(c->ctrlid);
+    uint8_t num_sec_ctrl = n->sec_ctrl_list.numcntl;
+    NvmeSecCtrlList list = {0};
+    uint8_t i;
+
+    for (i = 0; i < num_sec_ctrl; i++) {
+        if (n->sec_ctrl_list.sec[i].scid >= min_id) {
+            list.numcntl = num_sec_ctrl - i;
+            memcpy(&list.sec, n->sec_ctrl_list.sec + i,
+                   list.numcntl * sizeof(NvmeSecCtrlEntry));
+            break;
+        }
+    }
+
+    trace_pci_nvme_identify_sec_ctrl_list(pri_ctrl_id, list.numcntl);
+
+    return nvme_c2h(n, (uint8_t *)&list, sizeof(list), req);
+}
+
 static uint16_t nvme_identify_ns_csi(NvmeCtrl *n, NvmeRequest *req,
                                      bool active)
 {
@@ -5030,6 +5053,8 @@ static uint16_t nvme_identify(NvmeCtrl *n, NvmeRequest *req)
         return nvme_identify_ctrl_list(n, req, false);
     case NVME_ID_CNS_PRIMARY_CTRL_CAP:
         return nvme_identify_pri_ctrl_cap(n, req);
+    case NVME_ID_CNS_SECONDARY_CTRL_LIST:
+        return nvme_identify_sec_ctrl_list(n, req);
     case NVME_ID_CNS_CS_NS:
         return nvme_identify_ns_csi(n, req, true);
     case NVME_ID_CNS_CS_NS_PRESENT:
@@ -6622,6 +6647,9 @@ static void nvme_check_constraints(NvmeCtrl *n, Error **errp)
 static void nvme_init_state(NvmeCtrl *n)
 {
     NvmePriCtrlCap *cap = &n->pri_ctrl_cap;
+    NvmeSecCtrlList *list = &n->sec_ctrl_list;
+    NvmeSecCtrlEntry *sctrl;
+    int i;
 
     /* add one to max_ioqpairs to account for the admin queue pair */
     n->reg_size = pow2ceil(sizeof(NvmeBar) +
@@ -6633,6 +6661,13 @@ static void nvme_init_state(NvmeCtrl *n)
     n->starttime_ms = qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL);
     n->aer_reqs = g_new0(NvmeRequest *, n->params.aerl + 1);
 
+    list->numcntl = cpu_to_le16(n->params.sriov_max_vfs);
+    for (i = 0; i < n->params.sriov_max_vfs; i++) {
+        sctrl = &list->sec[i];
+        sctrl->pcid = cpu_to_le16(n->cntlid);
+        sctrl->vfn = cpu_to_le16(i + 1);
+    }
+
     cap->cntlid = cpu_to_le16(n->cntlid);
 }
 
diff --git a/hw/nvme/ns.c b/hw/nvme/ns.c
index 1b9c9d1156..870c3ca1a2 100644
--- a/hw/nvme/ns.c
+++ b/hw/nvme/ns.c
@@ -597,7 +597,7 @@ static void nvme_ns_realize(DeviceState *dev, Error **errp)
             for (i = 0; i < ARRAY_SIZE(subsys->ctrls); i++) {
                 NvmeCtrl *ctrl = subsys->ctrls[i];
 
-                if (ctrl) {
+                if (ctrl && ctrl != SUBSYS_SLOT_RSVD) {
                     nvme_attach_ns(ctrl, ns);
                 }
             }
diff --git a/hw/nvme/nvme.h b/hw/nvme/nvme.h
index 6ef458d3bc..b66421cdf9 100644
--- a/hw/nvme/nvme.h
+++ b/hw/nvme/nvme.h
@@ -43,6 +43,7 @@ typedef struct NvmeBus {
 #define TYPE_NVME_SUBSYS "nvme-subsys"
 #define NVME_SUBSYS(obj) \
     OBJECT_CHECK(NvmeSubsystem, (obj), TYPE_NVME_SUBSYS)
+#define SUBSYS_SLOT_RSVD (void *)0xFFFF
 
 typedef struct NvmeSubsystem {
     DeviceState parent_obj;
@@ -68,6 +69,10 @@ static inline NvmeCtrl *nvme_subsys_ctrl(NvmeSubsystem *subsys,
         return NULL;
     }
 
+    if (subsys->ctrls[cntlid] == SUBSYS_SLOT_RSVD) {
+        return NULL;
+    }
+
     return subsys->ctrls[cntlid];
 }
 
@@ -480,6 +485,7 @@ typedef struct NvmeCtrl {
     } features;
 
     NvmePriCtrlCap  pri_ctrl_cap;
+    NvmeSecCtrlList sec_ctrl_list;
 } NvmeCtrl;
 
 static inline NvmeNamespace *nvme_ns(NvmeCtrl *n, uint32_t nsid)
@@ -514,6 +520,18 @@ static inline uint16_t nvme_cid(NvmeRequest *req)
     return le16_to_cpu(req->cqe.cid);
 }
 
+static inline NvmeSecCtrlEntry *nvme_sctrl(NvmeCtrl *n)
+{
+    PCIDevice *pci_dev = &n->parent_obj;
+    NvmeCtrl *pf = NVME(pcie_sriov_get_pf(pci_dev));
+
+    if (pci_is_vf(pci_dev)) {
+        return &pf->sec_ctrl_list.sec[pcie_sriov_vf_number(pci_dev)];
+    }
+
+    return NULL;
+}
+
 void nvme_attach_ns(NvmeCtrl *n, NvmeNamespace *ns);
 uint16_t nvme_bounce_data(NvmeCtrl *n, void *ptr, uint32_t len,
                           NvmeTxDirection dir, NvmeRequest *req);
diff --git a/hw/nvme/subsys.c b/hw/nvme/subsys.c
index 691a90d209..9d2643678b 100644
--- a/hw/nvme/subsys.c
+++ b/hw/nvme/subsys.c
@@ -11,20 +11,71 @@
 
 #include "nvme.h"
 
-int nvme_subsys_register_ctrl(NvmeCtrl *n, Error **errp)
+static int nvme_subsys_reserve_cntlids(NvmeCtrl *n, int start, int num)
 {
     NvmeSubsystem *subsys = n->subsys;
-    int cntlid, nsid;
+    NvmeSecCtrlList *list = &n->sec_ctrl_list;
+    NvmeSecCtrlEntry *sctrl;
+    int i, cnt = 0;
+
+    for (i = start; i < ARRAY_SIZE(subsys->ctrls) && cnt < num; i++) {
+        if (!subsys->ctrls[i]) {
+            sctrl = &list->sec[cnt];
+            sctrl->scid = cpu_to_le16(i);
+            subsys->ctrls[i] = SUBSYS_SLOT_RSVD;
+            cnt++;
+        }
+    }
+
+    return cnt;
+}
 
-    for (cntlid = 0; cntlid < ARRAY_SIZE(subsys->ctrls); cntlid++) {
-        if (!subsys->ctrls[cntlid]) {
-            break;
+static void nvme_subsys_unreserve_cntlids(NvmeCtrl *n)
+{
+    NvmeSubsystem *subsys = n->subsys;
+    NvmeSecCtrlList *list = &n->sec_ctrl_list;
+    NvmeSecCtrlEntry *sctrl;
+    int i, cntlid;
+
+    for (i = 0; i < n->params.sriov_max_vfs; i++) {
+        sctrl = &list->sec[i];
+        cntlid = le16_to_cpu(sctrl->scid);
+
+        if (cntlid) {
+            assert(subsys->ctrls[cntlid] == SUBSYS_SLOT_RSVD);
+            subsys->ctrls[cntlid] = NULL;
+            sctrl->scid = 0;
         }
     }
+}
 
-    if (cntlid == ARRAY_SIZE(subsys->ctrls)) {
-        error_setg(errp, "no more free controller id");
-        return -1;
+int nvme_subsys_register_ctrl(NvmeCtrl *n, Error **errp)
+{
+    NvmeSubsystem *subsys = n->subsys;
+    NvmeSecCtrlEntry *sctrl = nvme_sctrl(n);
+    int cntlid, nsid, num_rsvd, num_vfs = n->params.sriov_max_vfs;
+
+    if (pci_is_vf(&n->parent_obj)) {
+        cntlid = le16_to_cpu(sctrl->scid);
+    } else {
+        for (cntlid = 0; cntlid < ARRAY_SIZE(subsys->ctrls); cntlid++) {
+            if (!subsys->ctrls[cntlid]) {
+                break;
+            }
+        }
+
+        if (cntlid == ARRAY_SIZE(subsys->ctrls)) {
+            error_setg(errp, "no more free controller id");
+            return -1;
+        }
+
+        num_rsvd = nvme_subsys_reserve_cntlids(n, cntlid + 1, num_vfs);
+        if (num_rsvd != num_vfs) {
+            nvme_subsys_unreserve_cntlids(n);
+            error_setg(errp,
+                       "no more free controller ids for secondary controllers");
+            return -1;
+        }
     }
 
     if (!subsys->serial) {
@@ -48,7 +99,13 @@ int nvme_subsys_register_ctrl(NvmeCtrl *n, Error **errp)
 
 void nvme_subsys_unregister_ctrl(NvmeSubsystem *subsys, NvmeCtrl *n)
 {
-    subsys->ctrls[n->cntlid] = NULL;
+    if (pci_is_vf(&n->parent_obj)) {
+        subsys->ctrls[n->cntlid] = SUBSYS_SLOT_RSVD;
+    } else {
+        subsys->ctrls[n->cntlid] = NULL;
+        nvme_subsys_unreserve_cntlids(n);
+    }
+
     n->cntlid = -1;
 }
 
diff --git a/hw/nvme/trace-events b/hw/nvme/trace-events
index 1834b17cf2..889bbb3101 100644
--- a/hw/nvme/trace-events
+++ b/hw/nvme/trace-events
@@ -57,6 +57,7 @@ pci_nvme_identify_ctrl_csi(uint8_t csi) "identify controller, csi=0x%"PRIx8""
 pci_nvme_identify_ns(uint32_t ns) "nsid %"PRIu32""
 pci_nvme_identify_ctrl_list(uint8_t cns, uint16_t cntid) "cns 0x%"PRIx8" cntid %"PRIu16""
 pci_nvme_identify_pri_ctrl_cap(uint16_t cntlid) "identify primary controller capabilities cntlid=%"PRIu16""
+pci_nvme_identify_sec_ctrl_list(uint16_t cntlid, uint8_t numcntl) "identify secondary controller list cntlid=%"PRIu16" numcntl=%"PRIu8""
 pci_nvme_identify_ns_csi(uint32_t ns, uint8_t csi) "nsid=%"PRIu32", csi=0x%"PRIx8""
 pci_nvme_identify_nslist(uint32_t ns) "nsid %"PRIu32""
 pci_nvme_identify_nslist_csi(uint16_t ns, uint8_t csi) "nsid=%"PRIu16", csi=0x%"PRIx8""