nvme: Add nvme_ensure_shutdown()

We're not using it in the end because we fixed this in Linux, but I went
through the trouble of writing the function so we might as well leave it
lying around.

Signed-off-by: Hector Martin <marcan@marcan.st>

src/asc.c

@@ -52,7 +52,7 @@ asc_dev_t *asc_init(const char *path)
     asc->cpu_base = base;
     asc->base = base + 0x8000;
 
-    clear32(base + ASC_CPU_CONTROL, ASC_CPU_CONTROL_START);
+    // clear32(base + ASC_CPU_CONTROL, ASC_CPU_CONTROL_START);
     return asc;
 }
 
@@ -76,6 +76,11 @@ void asc_cpu_stop(asc_dev_t *asc)
     clear32(asc->cpu_base + ASC_CPU_CONTROL, ASC_CPU_CONTROL_START);
 }
 
+bool asc_cpu_running(asc_dev_t *asc)
+{
+    return read32(asc->cpu_base + ASC_CPU_CONTROL) & ASC_CPU_CONTROL_START;
+}
+
 bool asc_can_recv(asc_dev_t *asc)
 {
     return !(read32(asc->base + ASC_MBOX_I2A_CONTROL) & ASC_MBOX_CONTROL_EMPTY);

src/asc.h

@@ -19,6 +19,7 @@ int asc_get_iop_node(asc_dev_t *asc);
 
 void asc_cpu_start(asc_dev_t *asc);
 void asc_cpu_stop(asc_dev_t *asc);
+bool asc_cpu_running(asc_dev_t *asc);
 
 bool asc_can_recv(asc_dev_t *asc);
 bool asc_can_send(asc_dev_t *asc);

src/nvme.c

@@ -427,10 +427,55 @@ out_adminq:
     return false;
 }
 
+void nvme_ensure_shutdown(void)
+{
+    nvme_asc = asc_init("/arm-io/ans");
+    if (!nvme_asc)
+        return;
+
+    if (!asc_cpu_running(nvme_asc)) {
+        printf("nvme: ANS not running\n");
+        asc_free(nvme_asc);
+        nvme_asc = NULL;
+        return;
+    }
+
+    printf("nvme: Found ANS left powered, doing a proper shutdown\n");
+
+    nvme_sart = sart_init("/arm-io/sart-ans");
+    if (!nvme_sart)
+        goto fail;
+
+    nvme_rtkit = rtkit_init("nvme", nvme_asc, NULL, NULL, nvme_sart);
+    if (!nvme_rtkit)
+        goto fail;
+
+    if (!rtkit_boot(nvme_rtkit))
+        goto fail;
+
+    rtkit_sleep(nvme_rtkit);
+
+fail:
+    if (nvme_rtkit) {
+        rtkit_free(nvme_rtkit);
+        nvme_rtkit = NULL;
+    }
+    if (nvme_sart) {
+        sart_free(nvme_sart);
+        nvme_sart = NULL;
+    }
+    asc_free(nvme_asc);
+    nvme_asc = NULL;
+
+    // Some machines call this ANS, some ANS2...
+    pmgr_reset(nvme_die, "ANS");
+    pmgr_reset(nvme_die, "ANS2");
+}
+
 void nvme_shutdown(void)
 {
     if (!nvme_initialized) {
-        printf("nvme: trying to shut down but not initialized\n");
+        // nvme_ensure_shutdown();
         return;
     }