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drm/msm/gpu: Capture the GPU state on a GPU hang 

Capture the GPU state on a GPU hang and store it for later playback
via the devcoredump facility. 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 after capturing
it and then a new one will be captured on the next hang.

Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>
Signed-off-by: Rob Clark <robdclark@gmail.com>
This commit is contained in:
Jordan Crouse 2018-07-24 10:33:27 -06:00 committed by Rob Clark
parent 65a3c2748e
commit c0fec7f562
9 changed files with 154 additions and 23 deletions
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1
drivers/gpu/drm/msm/Kconfig
View File

@ -12,6 +12,7 @@ config DRM_MSM
select SHMEM
select TMPFS
select QCOM_SCM
select WANT_DEV_COREDUMP
select SND_SOC_HDMI_CODEC if SND_SOC
select SYNC_FILE
select PM_OPP

2
drivers/gpu/drm/msm/adreno/a3xx_gpu.c
View File

@ -454,7 +454,7 @@ static const struct adreno_gpu_funcs funcs = {
.active_ring = adreno_active_ring,
.irq = a3xx_irq,
.destroy = a3xx_destroy,
#ifdef CONFIG_DEBUG_FS
#if defined(CONFIG_DEBUG_FS) || defined(CONFIG_DEV_COREDUMP)
.show = adreno_show,
#endif
.gpu_state_get = a3xx_gpu_state_get,

2
drivers/gpu/drm/msm/adreno/a4xx_gpu.c
View File

@ -540,7 +540,7 @@ static const struct adreno_gpu_funcs funcs = {
.active_ring = adreno_active_ring,
.irq = a4xx_irq,
.destroy = a4xx_destroy,
#ifdef CONFIG_DEBUG_FS
#if defined(CONFIG_DEBUG_FS) || defined(CONFIG_DEV_COREDUMP)
.show = adreno_show,
#endif
.gpu_state_get = a4xx_gpu_state_get,

4
drivers/gpu/drm/msm/adreno/a5xx_gpu.c
View File

@ -1243,8 +1243,10 @@ static const struct adreno_gpu_funcs funcs = {
.active_ring = a5xx_active_ring,
.irq = a5xx_irq,
.destroy = a5xx_destroy,
#ifdef CONFIG_DEBUG_FS
#if defined(CONFIG_DEBUG_FS) || defined(CONFIG_DEV_COREDUMP)
.show = adreno_show,
#endif
#if defined(CONFIG_DEBUG_FS)
.debugfs_init = a5xx_debugfs_init,
#endif
.gpu_busy = a5xx_gpu_busy,

36
drivers/gpu/drm/msm/adreno/adreno_gpu.c
View File

@ -378,6 +378,8 @@ 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++) {
@ -414,18 +416,28 @@ 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->comm);
kfree(state->cmd);
kfree(state->registers);
kfree(state);
}
#ifdef CONFIG_DEBUG_FS
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);
}
#if defined(CONFIG_DEBUG_FS) || defined(CONFIG_DEV_COREDUMP)
void adreno_show(struct msm_gpu *gpu, struct msm_gpu_state *state,
struct seq_file *m)
struct drm_printer *p)
{
struct adreno_gpu *adreno_gpu = to_adreno_gpu(gpu);
int i;
@ -433,23 +445,23 @@ void adreno_show(struct msm_gpu *gpu, struct msm_gpu_state *state,
if (IS_ERR_OR_NULL(state))
return;
seq_printf(m, "status: %08x\n", state->rbbm_status);
seq_printf(m, "revision: %d (%d.%d.%d.%d)\n",
drm_printf(p, "status: %08x\n", state->rbbm_status);
drm_printf(p, "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);
for (i = 0; i < gpu->nr_rings; i++) {
seq_printf(m, "rb %d: fence: %d/%d\n", i,
drm_printf(p, "rb %d: fence: %d/%d\n", i,
state->ring[i].fence, state->ring[i].seqno);
seq_printf(m, " rptr: %d\n", state->ring[i].rptr);
seq_printf(m, "rb wptr: %d\n", state->ring[i].wptr);
drm_printf(p, " rptr: %d\n", state->ring[i].rptr);
drm_printf(p, "rb wptr: %d\n", state->ring[i].wptr);
}
seq_printf(m, "IO:region %s 00000000 00020000\n", gpu->name);
drm_printf(p, "IO:region %s 00000000 00020000\n", gpu->name);
for (i = 0; i < state->nr_registers; i++) {
seq_printf(m, "IO:R %08x %08x\n",
drm_printf(p, "IO:R %08x %08x\n",
state->registers[i * 2] << 2,
state->registers[(i * 2) + 1]);
}

6
drivers/gpu/drm/msm/adreno/adreno_gpu.h
View File

@ -215,9 +215,9 @@ void adreno_submit(struct msm_gpu *gpu, struct msm_gem_submit *submit,
struct msm_file_private *ctx);
void adreno_flush(struct msm_gpu *gpu, struct msm_ringbuffer *ring);
bool adreno_idle(struct msm_gpu *gpu, struct msm_ringbuffer *ring);
#ifdef CONFIG_DEBUG_FS
#if defined(CONFIG_DEBUG_FS) || defined(CONFIG_DEV_COREDUMP)
void adreno_show(struct msm_gpu *gpu, struct msm_gpu_state *state,
struct seq_file *m);
struct drm_printer *p);
#endif
void adreno_dump_info(struct msm_gpu *gpu);
void adreno_dump(struct msm_gpu *gpu);
@ -231,7 +231,7 @@ void adreno_gpu_cleanup(struct adreno_gpu *gpu);
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) */

5
drivers/gpu/drm/msm/msm_debugfs.c
View File

@ -29,6 +29,7 @@ struct msm_gpu_show_priv {
static int msm_gpu_show(struct seq_file *m, void *arg)
{
struct drm_printer p = drm_seq_file_printer(m);
struct msm_gpu_show_priv *show_priv = m->private;
struct msm_drm_private *priv = show_priv->dev->dev_private;
struct msm_gpu *gpu = priv->gpu;
@ -38,8 +39,8 @@ static int msm_gpu_show(struct seq_file *m, void *arg)
if (ret)
return ret;
seq_printf(m, "%s Status:\n", gpu->name);
gpu->funcs->show(gpu, show_priv->state, m);
drm_printf(&p, "%s Status:\n", gpu->name);
gpu->funcs->show(gpu, show_priv->state, &p);
mutex_unlock(&show_priv->dev->struct_mutex);

83
drivers/gpu/drm/msm/msm_gpu.c
View File

@ -20,10 +20,11 @@
#include "msm_mmu.h"
#include "msm_fence.h"
#include <generated/utsrelease.h>
#include <linux/string_helpers.h>
#include <linux/pm_opp.h>
#include <linux/devfreq.h>
#include <linux/devcoredump.h>
/*
* Power Management:
@ -273,6 +274,81 @@ int msm_gpu_hw_init(struct msm_gpu *gpu)
return ret;
}
#ifdef CONFIG_DEV_COREDUMP
static ssize_t msm_gpu_devcoredump_read(char *buffer, loff_t offset,
size_t count, void *data, size_t datalen)
{
struct msm_gpu *gpu = data;
struct drm_print_iterator iter;
struct drm_printer p;
struct msm_gpu_state *state;
state = msm_gpu_crashstate_get(gpu);
if (!state)
return 0;
iter.data = buffer;
iter.offset = 0;
iter.start = offset;
iter.remain = count;
p = drm_coredump_printer(&iter);
drm_printf(&p, "---\n");
drm_printf(&p, "kernel: " UTS_RELEASE "\n");
drm_printf(&p, "module: " KBUILD_MODNAME "\n");
drm_printf(&p, "time: %ld.%ld\n",
state->time.tv_sec, state->time.tv_usec);
if (state->comm)
drm_printf(&p, "comm: %s\n", state->comm);
if (state->cmd)
drm_printf(&p, "cmdline: %s\n", state->cmd);
gpu->funcs->show(gpu, state, &p);
msm_gpu_crashstate_put(gpu);
return count - iter.remain;
}
static void msm_gpu_devcoredump_free(void *data)
{
struct msm_gpu *gpu = data;
msm_gpu_crashstate_put(gpu);
}
static void msm_gpu_crashstate_capture(struct msm_gpu *gpu, char *comm,
char *cmd)
{
struct msm_gpu_state *state;
/* Only save one crash state at a time */
if (gpu->crashstate)
return;
state = gpu->funcs->gpu_state_get(gpu);
if (IS_ERR_OR_NULL(state))
return;
/* Fill in the additional crash state information */
state->comm = kstrdup(comm, GFP_KERNEL);
state->cmd = kstrdup(cmd, GFP_KERNEL);
/* Set the active crash state to be dumped on failure */
gpu->crashstate = state;
/* FIXME: Release the crashstate if this errors out? */
dev_coredumpm(gpu->dev->dev, THIS_MODULE, gpu, 0, GFP_KERNEL,
msm_gpu_devcoredump_read, msm_gpu_devcoredump_free);
}
#else
static void msm_gpu_crashstate_capture(struct msm_gpu *gpu, char *comm,
char *cmd)
{
}
#endif
/*
* Hangcheck detection for locked gpu:
*/
@ -356,6 +432,11 @@ static void recover_worker(struct work_struct *work)
msm_rd_dump_submit(priv->hangrd, submit, NULL);
}
/* Record the crash state */
pm_runtime_get_sync(&gpu->pdev->dev);
msm_gpu_crashstate_capture(gpu, comm, cmd);
pm_runtime_put_sync(&gpu->pdev->dev);
kfree(cmd);
kfree(comm);

38
drivers/gpu/drm/msm/msm_gpu.h
View File

@ -66,13 +66,13 @@ struct msm_gpu_funcs {
#ifdef CONFIG_DEBUG_FS
/* show GPU status in debugfs: */
void (*show)(struct msm_gpu *gpu, struct msm_gpu_state *state,
struct seq_file *m);
struct drm_printer *p);
/* for generation specific debugfs: */
int (*debugfs_init)(struct msm_gpu *gpu, struct drm_minor *minor);
#endif
int (*gpu_busy)(struct msm_gpu *gpu, uint64_t *value);
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 {
@ -133,6 +133,8 @@ struct msm_gpu {
u64 busy_cycles;
ktime_t time;
} devfreq;
struct msm_gpu_state *crashstate;
};
/* It turns out that all targets use the same ringbuffer size */
@ -180,6 +182,7 @@ struct msm_gpu_submitqueue {
};
struct msm_gpu_state {
struct kref ref;
struct timeval time;
struct {
@ -194,6 +197,9 @@ struct msm_gpu_state {
u32 *registers;
u32 rbbm_status;
char *comm;
char *cmd;
};
static inline void gpu_write(struct msm_gpu *gpu, u32 reg, u32 data)
@ -275,4 +281,32 @@ static inline void msm_submitqueue_put(struct msm_gpu_submitqueue *queue)
kref_put(&queue->ref, msm_submitqueue_destroy);
}
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__ */