drm/msm: add hang_debug module param

msm.hang_debug=y will dump out current register values if the gpu locks
up, for easier debugging.

Signed-off-by: Rob Clark <robdclark@gmail.com>

3 files changed, 52 insertions, 1 deletions

diff --git a/drivers/gpu/drm/msm/adreno/a3xx_gpu.c b/drivers/gpu/drm/msm/adreno/a3xx_gpu.c
index 461df93e825e..8b6fb847789e 100644
--- a/drivers/gpu/drm/msm/adreno/a3xx_gpu.c
+++ b/drivers/gpu/drm/msm/adreno/a3xx_gpu.c
@@ -35,6 +35,12 @@
          A3XX_INT0_CP_AHB_ERROR_HALT |     \
          A3XX_INT0_UCHE_OOB_ACCESS)
 
+
+static bool hang_debug = false;
+MODULE_PARM_DESC(hang_debug, "Dump registers when hang is detected (can be slow!)");
+module_param_named(hang_debug, hang_debug, bool, 0600);
+static void a3xx_dump(struct msm_gpu *gpu);
+
 static struct platform_device *a3xx_pdev;
 
 static void a3xx_me_init(struct msm_gpu *gpu)
@@ -291,6 +297,9 @@ static int a3xx_hw_init(struct msm_gpu *gpu)
 
 static void a3xx_recover(struct msm_gpu *gpu)
 {
+        /* dump registers before resetting gpu, if enabled: */
+        if (hang_debug)
+                a3xx_dump(gpu);
         gpu_write(gpu, REG_A3XX_RBBM_SW_RESET_CMD, 1);
         gpu_read(gpu, REG_A3XX_RBBM_SW_RESET_CMD);
         gpu_write(gpu, REG_A3XX_RBBM_SW_RESET_CMD, 0);
@@ -352,7 +361,6 @@ static irqreturn_t a3xx_irq(struct msm_gpu *gpu)
         return IRQ_HANDLED;
 }
 
-#ifdef CONFIG_DEBUG_FS
 static const unsigned int a3xx_registers[] = {
         0x0000, 0x0002, 0x0010, 0x0012, 0x0018, 0x0018, 0x0020, 0x0027,
         0x0029, 0x002b, 0x002e, 0x0033, 0x0040, 0x0042, 0x0050, 0x005c,
@@ -392,6 +400,7 @@ static const unsigned int a3xx_registers[] = {
         0x303c, 0x303c, 0x305e, 0x305f,
 };
 
+#ifdef CONFIG_DEBUG_FS
 static void a3xx_show(struct msm_gpu *gpu, struct seq_file *m)
 {
         int i;
@@ -415,6 +424,29 @@ static void a3xx_show(struct msm_gpu *gpu, struct seq_file *m)
 }
 #endif
 
+/* would be nice to not have to duplicate the _show() stuff with printk(): */
+static void a3xx_dump(struct msm_gpu *gpu)
+{
+        int i;
+
+        adreno_dump(gpu);
+        printk("status:   %08x\n",
+                        gpu_read(gpu, REG_A3XX_RBBM_STATUS));
+
+        /* dump these out in a form that can be parsed by demsm: */
+        printk("IO:region %s 00000000 00020000\n", gpu->name);
+        for (i = 0; i < ARRAY_SIZE(a3xx_registers); i += 2) {
+                uint32_t start = a3xx_registers[i];
+                uint32_t end   = a3xx_registers[i+1];
+                uint32_t addr;
+
+                for (addr = start; addr <= end; addr++) {
+                        uint32_t val = gpu_read(gpu, addr);
+                        printk("IO:R %08x %08x\n", addr<<2, val);
+                }
+        }
+}
+
 static const struct adreno_gpu_funcs funcs = {
         .base = {
                 .get_param = adreno_get_param,
diff --git a/drivers/gpu/drm/msm/adreno/adreno_gpu.c b/drivers/gpu/drm/msm/adreno/adreno_gpu.c
index d321099abdd4..cf6eb976dda7 100644
--- a/drivers/gpu/drm/msm/adreno/adreno_gpu.c
+++ b/drivers/gpu/drm/msm/adreno/adreno_gpu.c
@@ -260,6 +260,24 @@ void adreno_show(struct msm_gpu *gpu, struct seq_file *m)
 }
 #endif
 
+/* would be nice to not have to duplicate the _show() stuff with printk(): */
+void adreno_dump(struct msm_gpu *gpu)
+{
+        struct adreno_gpu *adreno_gpu = to_adreno_gpu(gpu);
+
+        printk("revision: %d (%d.%d.%d.%d)\n",
+                        adreno_gpu->info->revn, adreno_gpu->rev.core,
+                        adreno_gpu->rev.major, adreno_gpu->rev.minor,
+                        adreno_gpu->rev.patchid);
+
+        printk("fence:    %d/%d\n", adreno_gpu->memptrs->fence,
+                        gpu->submitted_fence);
+        printk("rptr:     %d\n", adreno_gpu->memptrs->rptr);
+        printk("wptr:     %d\n", adreno_gpu->memptrs->wptr);
+        printk("rb wptr:  %d\n", get_wptr(gpu->rb));
+
+}
+
 void adreno_wait_ring(struct msm_gpu *gpu, uint32_t ndwords)
 {
         struct adreno_gpu *adreno_gpu = to_adreno_gpu(gpu);
diff --git a/drivers/gpu/drm/msm/adreno/adreno_gpu.h b/drivers/gpu/drm/msm/adreno/adreno_gpu.h
index ca11ea4da165..e16200ddc60b 100644
--- a/drivers/gpu/drm/msm/adreno/adreno_gpu.h
+++ b/drivers/gpu/drm/msm/adreno/adreno_gpu.h
@@ -114,6 +114,7 @@ void adreno_idle(struct msm_gpu *gpu);
 #ifdef CONFIG_DEBUG_FS
 void adreno_show(struct msm_gpu *gpu, struct seq_file *m);
 #endif
+void adreno_dump(struct msm_gpu *gpu);
 void adreno_wait_ring(struct msm_gpu *gpu, uint32_t ndwords);
 
 int adreno_gpu_init(struct drm_device *drm, struct platform_device *pdev,