Capture the GPU state on a GPU hang and store it for later playback
using the 'crash' node in the debugfs directory. Only one crash
state is stored at a time on the assumption that the first hang is
usually the most interesting. The existing crash state can be cleared
by writing to the debugfs node and then a new one will be captured
on the next hang.
Signed-off-by: Jordan Crouse <jcro...@codeaurora.org>
---
drivers/gpu/drm/msm/adreno/a3xx_gpu.c | 1 +
drivers/gpu/drm/msm/adreno/a4xx_gpu.c | 1 +
drivers/gpu/drm/msm/adreno/a5xx_gpu.c | 1 +
drivers/gpu/drm/msm/adreno/adreno_gpu.c | 16 +++++++--
drivers/gpu/drm/msm/adreno/adreno_gpu.h | 2 +-
drivers/gpu/drm/msm/msm_debugfs.c | 57 +++++++++++++++++++++++++++++++++
drivers/gpu/drm/msm/msm_gpu.h | 44 ++++++++++++++++++++++++-
7 files changed, 117 insertions(+), 5 deletions(-)
diff --git a/drivers/gpu/drm/msm/adreno/a3xx_gpu.c
b/drivers/gpu/drm/msm/adreno/a3xx_gpu.c
index 8a7d56ec..be65b4e 100644
--- a/drivers/gpu/drm/msm/adreno/a3xx_gpu.c
+++ b/drivers/gpu/drm/msm/adreno/a3xx_gpu.c
@@ -320,6 +320,7 @@ static void a3xx_recover(struct msm_gpu *gpu)
gpu_write(gpu, REG_A3XX_RBBM_SW_RESET_CMD, 0);
adreno_recover(gpu);
+ msm_gpu_crashstate_set(gpu, state);
gpu->funcs->gpu_state_put(state);
}
diff --git a/drivers/gpu/drm/msm/adreno/a4xx_gpu.c
b/drivers/gpu/drm/msm/adreno/a4xx_gpu.c
index e64c7fc..943e13f 100644
--- a/drivers/gpu/drm/msm/adreno/a4xx_gpu.c
+++ b/drivers/gpu/drm/msm/adreno/a4xx_gpu.c
@@ -319,6 +319,7 @@ static void a4xx_recover(struct msm_gpu *gpu)
gpu_write(gpu, REG_A4XX_RBBM_SW_RESET_CMD, 0);
adreno_recover(gpu);
+ msm_gpu_crashstate_set(gpu, state);
gpu->funcs->gpu_state_put(state);
}
diff --git a/drivers/gpu/drm/msm/adreno/a5xx_gpu.c
b/drivers/gpu/drm/msm/adreno/a5xx_gpu.c
index 6747b7b..1e32c2e 100644
--- a/drivers/gpu/drm/msm/adreno/a5xx_gpu.c
+++ b/drivers/gpu/drm/msm/adreno/a5xx_gpu.c
@@ -774,6 +774,7 @@ static void a5xx_recover(struct msm_gpu *gpu)
gpu_write(gpu, REG_A5XX_RBBM_SW_RESET_CMD, 0);
adreno_recover(gpu);
+ msm_gpu_crashstate_set(gpu, state);
gpu->funcs->gpu_state_put(state);
}
diff --git a/drivers/gpu/drm/msm/adreno/adreno_gpu.c
b/drivers/gpu/drm/msm/adreno/adreno_gpu.c
index ba1b912..e1785c2 100644
--- a/drivers/gpu/drm/msm/adreno/adreno_gpu.c
+++ b/drivers/gpu/drm/msm/adreno/adreno_gpu.c
@@ -372,6 +372,8 @@ struct msm_gpu_state *adreno_gpu_state_get(struct msm_gpu
*gpu)
if (!state)
return ERR_PTR(-ENOMEM);
+ kref_init(&state->ref);
+
do_gettimeofday(&state->time);
for (i = 0; i < gpu->nr_rings; i++) {
@@ -407,15 +409,23 @@ struct msm_gpu_state *adreno_gpu_state_get(struct msm_gpu
*gpu)
return state;
}
-void adreno_gpu_state_put(struct msm_gpu_state *state)
+static void adreno_gpu_state_destroy(struct kref *kref)
{
- if (IS_ERR_OR_NULL(state))
- return;
+ struct msm_gpu_state *state = container_of(kref,
+ struct msm_gpu_state, ref);
kfree(state->registers);
kfree(state);
}
+int adreno_gpu_state_put(struct msm_gpu_state *state)
+{
+ if (IS_ERR_OR_NULL(state))
+ return 1;
+
+ return kref_put(&state->ref, adreno_gpu_state_destroy);
+}
+
void adreno_show_info(struct msm_gpu *gpu, struct msm_gpu_state *state,
struct drm_printer *p)
{
diff --git a/drivers/gpu/drm/msm/adreno/adreno_gpu.h
b/drivers/gpu/drm/msm/adreno/adreno_gpu.h
index 4542b6b..e304a3e 100644
--- a/drivers/gpu/drm/msm/adreno/adreno_gpu.h
+++ b/drivers/gpu/drm/msm/adreno/adreno_gpu.h
@@ -230,7 +230,7 @@ void adreno_show_regs(struct msm_gpu *gpu, struct
msm_gpu_state *state,
struct drm_printer *p);
struct msm_gpu_state *adreno_gpu_state_get(struct msm_gpu *gpu);
-void adreno_gpu_state_put(struct msm_gpu_state *state);
+int adreno_gpu_state_put(struct msm_gpu_state *state);
/* ringbuffer helpers (the parts that are adreno specific) */
diff --git a/drivers/gpu/drm/msm/msm_debugfs.c
b/drivers/gpu/drm/msm/msm_debugfs.c
index 89ee74b..1bde88d 100644
--- a/drivers/gpu/drm/msm/msm_debugfs.c
+++ b/drivers/gpu/drm/msm/msm_debugfs.c
@@ -16,11 +16,65 @@
*/
#ifdef CONFIG_DEBUG_FS
+
+#include <generated/utsrelease.h>
+#include <linux/debugfs.h>
#include "msm_drv.h"
#include "msm_gpu.h"
#include "msm_kms.h"
#include "msm_debugfs.h"
+static int msm_gpu_crash_show(struct seq_file *m, void *data)
+{
+ struct msm_gpu *gpu = m->private;
+ struct msm_gpu_state *state;
+
+ state = msm_gpu_crashstate_get(gpu);
+ if (!state)
+ return 0;
+
+ seq_printf(m, "%s Crash Status:\n", gpu->name);
+ seq_puts(m, "Kernel: " UTS_RELEASE "\n");
+ seq_printf(m, "Time: %ld s %ld us\n",
+ state->time.tv_sec, state->time.tv_usec);
+
+ gpu->funcs->show(gpu, state, m);
+
+ msm_gpu_crashstate_put(gpu);
+
+ return 0;
+}
+
+static ssize_t msm_gpu_crash_write(struct file *file, const char __user *buf,
+ size_t count, loff_t *pos)
+{
+ struct msm_gpu *gpu = ((struct seq_file *)file->private_data)->private;
+
+ dev_err(gpu->dev->dev, "Releasing the GPU crash state\n");
+ msm_gpu_crashstate_put(gpu);
+
+ return count;
+}
+
+static int msm_gpu_crash_open(struct inode *inode, struct file *file)
+{
+ struct msm_drm_private *priv = inode->i_private;
+
+ if (!priv->gpu)
+ return -ENODEV;
+
+ return single_open(file, msm_gpu_crash_show, priv->gpu);
+}
+
+static const struct file_operations msm_gpu_crash_fops = {
+ .owner = THIS_MODULE,
+ .open = msm_gpu_crash_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+ .write = msm_gpu_crash_write,
+};
+
static int msm_gpu_show(struct drm_device *dev, struct seq_file *m)
{
struct msm_drm_private *priv = dev->dev_private;
@@ -170,6 +224,9 @@ int msm_debugfs_init(struct drm_minor *minor)
return ret;
}
+ debugfs_create_file("crash", 0644, minor->debugfs_root,
+ priv, &msm_gpu_crash_fops);
+
if (priv->kms->funcs->debugfs_init)
ret = priv->kms->funcs->debugfs_init(priv->kms, minor);
diff --git a/drivers/gpu/drm/msm/msm_gpu.h b/drivers/gpu/drm/msm/msm_gpu.h
index cff52ca..7ce2cba 100644
--- a/drivers/gpu/drm/msm/msm_gpu.h
+++ b/drivers/gpu/drm/msm/msm_gpu.h
@@ -69,7 +69,7 @@ struct msm_gpu_funcs {
struct seq_file *m);
#endif
struct msm_gpu_state *(*gpu_state_get)(struct msm_gpu *gpu);
- void (*gpu_state_put)(struct msm_gpu_state *state);
+ int (*gpu_state_put)(struct msm_gpu_state *state);
};
struct msm_gpu {
@@ -129,6 +129,8 @@ struct msm_gpu {
struct work_struct recover_work;
struct drm_gem_object *memptrs_bo;
+
+ struct msm_gpu_state *crashstate;
};
/* It turns out that all targets use the same ringbuffer size */
@@ -176,6 +178,7 @@ struct msm_gpu_submitqueue {
};
struct msm_gpu_state {
+ struct kref ref;
struct timeval time;
struct {
@@ -270,4 +273,43 @@ static inline void msm_submitqueue_put(struct
msm_gpu_submitqueue *queue)
kref_put(&queue->ref, msm_submitqueue_destroy);
}
+static inline void msm_gpu_crashstate_set(struct msm_gpu *gpu,
+ struct msm_gpu_state *state)
+{
+ /* FIXME: make sure the mutex is set? */
+
+ if (!IS_ERR_OR_NULL(state) && !gpu->crashstate) {
+ kref_get(&state->ref);
+ gpu->crashstate = state;
+ }
+}
+
+static inline struct msm_gpu_state *msm_gpu_crashstate_get(struct msm_gpu *gpu)
+{
+ struct msm_gpu_state *state = NULL;
+
+ mutex_lock(&gpu->dev->struct_mutex);
+
+ if (gpu->crashstate) {
+ kref_get(&gpu->crashstate->ref);
+ state = gpu->crashstate;
+ }
+
+ mutex_unlock(&gpu->dev->struct_mutex);
+
+ return state;
+}
+
+static inline void msm_gpu_crashstate_put(struct msm_gpu *gpu)
+{
+ mutex_lock(&gpu->dev->struct_mutex);
+
+ if (gpu->crashstate) {
+ if (gpu->funcs->gpu_state_put(gpu->crashstate))
+ gpu->crashstate = NULL;
+ }
+
+ mutex_unlock(&gpu->dev->struct_mutex);
+}
+
#endif /* __MSM_GPU_H__ */
--
1.9.1
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