[PATCH v6 11/42] nvme: add temperature threshold feature

[Klaus Jensen]

From: Klaus Jensen <address@hidden>

It might seem wierd to implement this feature for an emulated device,
but it is mandatory to support and the feature is useful for testing
asynchronous event request support, which will be added in a later
patch.

Signed-off-by: Klaus Jensen <address@hidden>
Acked-by: Keith Busch <address@hidden>
---
 hw/block/nvme.c      | 48 ++++++++++++++++++++++++++++++++++++++++++++
 hw/block/nvme.h      |  2 ++
 include/block/nvme.h |  8 +++++++-
 3 files changed, 57 insertions(+), 1 deletion(-)

diff --git a/hw/block/nvme.c b/hw/block/nvme.c
index 665485045066..64c42101df5c 100644
--- a/hw/block/nvme.c
+++ b/hw/block/nvme.c
@@ -45,6 +45,9 @@
 #include "nvme.h"
 
 #define NVME_CMB_BIR 2
+#define NVME_TEMPERATURE 0x143
+#define NVME_TEMPERATURE_WARNING 0x157
+#define NVME_TEMPERATURE_CRITICAL 0x175
 
 #define NVME_GUEST_ERR(trace, fmt, ...) \
     do { \
@@ -798,9 +801,31 @@ static uint16_t nvme_get_feature_timestamp(NvmeCtrl *n, 
NvmeCmd *cmd)
 static uint16_t nvme_get_feature(NvmeCtrl *n, NvmeCmd *cmd, NvmeRequest *req)
 {
     uint32_t dw10 = le32_to_cpu(cmd->cdw10);
+    uint32_t dw11 = le32_to_cpu(cmd->cdw11);
     uint32_t result;
 
     switch (dw10) {
+    case NVME_TEMPERATURE_THRESHOLD:
+        result = 0;
+
+        /*
+         * The controller only implements the Composite Temperature sensor, so
+         * return 0 for all other sensors.
+         */
+        if (NVME_TEMP_TMPSEL(dw11)) {
+            break;
+        }
+
+        switch (NVME_TEMP_THSEL(dw11)) {
+        case 0x0:
+            result = cpu_to_le16(n->features.temp_thresh_hi);
+            break;
+        case 0x1:
+            result = cpu_to_le16(n->features.temp_thresh_low);
+            break;
+        }
+
+        break;
     case NVME_VOLATILE_WRITE_CACHE:
         result = blk_enable_write_cache(n->conf.blk);
         trace_nvme_dev_getfeat_vwcache(result ? "enabled" : "disabled");
@@ -845,6 +870,23 @@ static uint16_t nvme_set_feature(NvmeCtrl *n, NvmeCmd 
*cmd, NvmeRequest *req)
     uint32_t dw11 = le32_to_cpu(cmd->cdw11);
 
     switch (dw10) {
+    case NVME_TEMPERATURE_THRESHOLD:
+        if (NVME_TEMP_TMPSEL(dw11)) {
+            break;
+        }
+
+        switch (NVME_TEMP_THSEL(dw11)) {
+        case 0x0:
+            n->features.temp_thresh_hi = NVME_TEMP_TMPTH(dw11);
+            break;
+        case 0x1:
+            n->features.temp_thresh_low = NVME_TEMP_TMPTH(dw11);
+            break;
+        default:
+            return NVME_INVALID_FIELD | NVME_DNR;
+        }
+
+        break;
     case NVME_VOLATILE_WRITE_CACHE:
         blk_set_enable_write_cache(n->conf.blk, dw11 & 1);
         break;
@@ -1374,6 +1416,7 @@ static void nvme_init_state(NvmeCtrl *n)
     n->namespaces = g_new0(NvmeNamespace, n->num_namespaces);
     n->sq = g_new0(NvmeSQueue *, n->params.max_ioqpairs + 1);
     n->cq = g_new0(NvmeCQueue *, n->params.max_ioqpairs + 1);
+    n->features.temp_thresh_hi = NVME_TEMPERATURE_WARNING;
 }
 
 static void nvme_init_cmb(NvmeCtrl *n, PCIDevice *pci_dev)
@@ -1451,6 +1494,11 @@ static void nvme_init_ctrl(NvmeCtrl *n)
     id->acl = 3;
     id->frmw = 7 << 1;
     id->lpa = 1 << 0;
+
+    /* recommended default value (~70 C) */
+    id->wctemp = cpu_to_le16(NVME_TEMPERATURE_WARNING);
+    id->cctemp = cpu_to_le16(NVME_TEMPERATURE_CRITICAL);
+
     id->sqes = (0x6 << 4) | 0x6;
     id->cqes = (0x4 << 4) | 0x4;
     id->nn = cpu_to_le32(n->num_namespaces);
diff --git a/hw/block/nvme.h b/hw/block/nvme.h
index b7c465560eea..8cda5f02c622 100644
--- a/hw/block/nvme.h
+++ b/hw/block/nvme.h
@@ -108,6 +108,7 @@ typedef struct NvmeCtrl {
     uint64_t    irq_status;
     uint64_t    host_timestamp;                 /* Timestamp sent by the host 
*/
     uint64_t    timestamp_set_qemu_clock_ms;    /* QEMU clock time */
+    uint16_t    temperature;
 
     NvmeNamespace   *namespaces;
     NvmeSQueue      **sq;
@@ -115,6 +116,7 @@ typedef struct NvmeCtrl {
     NvmeSQueue      admin_sq;
     NvmeCQueue      admin_cq;
     NvmeIdCtrl      id_ctrl;
+    NvmeFeatureVal  features;
 } NvmeCtrl;
 
 static inline uint64_t nvme_ns_nlbas(NvmeCtrl *n, NvmeNamespace *ns)
diff --git a/include/block/nvme.h b/include/block/nvme.h
index a083c1b3a613..91fc4738a3e0 100644
--- a/include/block/nvme.h
+++ b/include/block/nvme.h
@@ -688,7 +688,13 @@ enum NvmeIdCtrlOncs {
 typedef struct NvmeFeatureVal {
     uint32_t    arbitration;
     uint32_t    power_mgmt;
-    uint32_t    temp_thresh;
+    union {
+        struct {
+            uint16_t temp_thresh_hi;
+            uint16_t temp_thresh_low;
+        };
+        uint32_t temp_thresh;
+    };
     uint32_t    err_rec;
     uint32_t    volatile_wc;
     uint32_t    num_queues;
-- 
2.25.1