338 lines
8.0 KiB
C
338 lines
8.0 KiB
C
|
/*
|
||
|
|
* Copyright (C) 2013 Red Hat
|
||
|
|
* Author: Rob Clark <robdclark@gmail.com>
|
||
|
|
*
|
||
|
|
* This program is free software; you can redistribute it and/or modify it
|
||
|
|
* under the terms of the GNU General Public License version 2 as published by
|
||
|
|
* the Free Software Foundation.
|
||
|
|
*
|
||
|
|
* This program is distributed in the hope that it will be useful, but WITHOUT
|
||
|
|
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
||
|
|
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
|
||
|
|
* more details.
|
||
|
|
*
|
||
|
|
* You should have received a copy of the GNU General Public License along with
|
||
|
|
* this program. If not, see <http://www.gnu.org/licenses/>.
|
||
|
|
*/
|
||
|
|
|
||
|
|
/* For debugging crashes, userspace can:
|
||
|
|
*
|
||
|
|
* tail -f /sys/kernel/debug/dri/<minor>/rd > logfile.rd
|
||
|
|
*
|
||
|
|
* To log the cmdstream in a format that is understood by freedreno/cffdump
|
||
|
|
* utility. By comparing the last successfully completed fence #, to the
|
||
|
|
* cmdstream for the next fence, you can narrow down which process and submit
|
||
|
|
* caused the gpu crash/lockup.
|
||
|
|
*
|
||
|
|
* This bypasses drm_debugfs_create_files() mainly because we need to use
|
||
|
|
* our own fops for a bit more control. In particular, we don't want to
|
||
|
|
* do anything if userspace doesn't have the debugfs file open.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#ifdef CONFIG_DEBUG_FS
|
||
|
|
|
||
|
|
#include <linux/kfifo.h>
|
||
|
|
#include <linux/debugfs.h>
|
||
|
|
#include <linux/circ_buf.h>
|
||
|
|
#include <linux/wait.h>
|
||
|
|
|
||
|
|
#include "msm_drv.h"
|
||
|
|
#include "msm_gpu.h"
|
||
|
|
#include "msm_gem.h"
|
||
|
|
|
||
|
|
enum rd_sect_type {
|
||
|
|
RD_NONE,
|
||
|
|
RD_TEST, /* ascii text */
|
||
|
|
RD_CMD, /* ascii text */
|
||
|
|
RD_GPUADDR, /* u32 gpuaddr, u32 size */
|
||
|
|
RD_CONTEXT, /* raw dump */
|
||
|
|
RD_CMDSTREAM, /* raw dump */
|
||
|
|
RD_CMDSTREAM_ADDR, /* gpu addr of cmdstream */
|
||
|
|
RD_PARAM, /* u32 param_type, u32 param_val, u32 bitlen */
|
||
|
|
RD_FLUSH, /* empty, clear previous params */
|
||
|
|
RD_PROGRAM, /* shader program, raw dump */
|
||
|
|
RD_VERT_SHADER,
|
||
|
|
RD_FRAG_SHADER,
|
||
|
|
RD_BUFFER_CONTENTS,
|
||
|
|
RD_GPU_ID,
|
||
|
|
};
|
||
|
|
|
||
|
|
#define BUF_SZ 512 /* should be power of 2 */
|
||
|
|
|
||
|
|
/* space used: */
|
||
|
|
#define circ_count(circ) \
|
||
|
|
(CIRC_CNT((circ)->head, (circ)->tail, BUF_SZ))
|
||
|
|
#define circ_count_to_end(circ) \
|
||
|
|
(CIRC_CNT_TO_END((circ)->head, (circ)->tail, BUF_SZ))
|
||
|
|
/* space available: */
|
||
|
|
#define circ_space(circ) \
|
||
|
|
(CIRC_SPACE((circ)->head, (circ)->tail, BUF_SZ))
|
||
|
|
#define circ_space_to_end(circ) \
|
||
|
|
(CIRC_SPACE_TO_END((circ)->head, (circ)->tail, BUF_SZ))
|
||
|
|
|
||
|
|
struct msm_rd_state {
|
||
|
|
struct drm_device *dev;
|
||
|
|
|
||
|
|
bool open;
|
||
|
|
|
||
|
|
struct dentry *ent;
|
||
|
|
struct drm_info_node *node;
|
||
|
|
|
||
|
|
/* current submit to read out: */
|
||
|
|
struct msm_gem_submit *submit;
|
||
|
|
|
||
|
|
/* fifo access is synchronized on the producer side by
|
||
|
|
* struct_mutex held by submit code (otherwise we could
|
||
|
|
* end up w/ cmds logged in different order than they
|
||
|
|
* were executed). And read_lock synchronizes the reads
|
||
|
|
*/
|
||
|
|
struct mutex read_lock;
|
||
|
|
|
||
|
|
wait_queue_head_t fifo_event;
|
||
|
|
struct circ_buf fifo;
|
||
|
|
|
||
|
|
char buf[BUF_SZ];
|
||
|
|
};
|
||
|
|
|
||
|
|
static void rd_write(struct msm_rd_state *rd, const void *buf, int sz)
|
||
|
|
{
|
||
|
|
struct circ_buf *fifo = &rd->fifo;
|
||
|
|
const char *ptr = buf;
|
||
|
|
|
||
|
|
while (sz > 0) {
|
||
|
|
char *fptr = &fifo->buf[fifo->head];
|
||
|
|
int n;
|
||
|
|
|
||
|
|
wait_event(rd->fifo_event, circ_space(&rd->fifo) > 0);
|
||
|
|
|
||
|
|
n = min(sz, circ_space_to_end(&rd->fifo));
|
||
|
|
memcpy(fptr, ptr, n);
|
||
|
|
|
||
|
|
fifo->head = (fifo->head + n) & (BUF_SZ - 1);
|
||
|
|
sz -= n;
|
||
|
|
ptr += n;
|
||
|
|
|
||
|
|
wake_up_all(&rd->fifo_event);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
static void rd_write_section(struct msm_rd_state *rd,
|
||
|
|
enum rd_sect_type type, const void *buf, int sz)
|
||
|
|
{
|
||
|
|
rd_write(rd, &type, 4);
|
||
|
|
rd_write(rd, &sz, 4);
|
||
|
|
rd_write(rd, buf, sz);
|
||
|
|
}
|
||
|
|
|
||
|
|
static ssize_t rd_read(struct file *file, char __user *buf,
|
||
|
|
size_t sz, loff_t *ppos)
|
||
|
|
{
|
||
|
|
struct msm_rd_state *rd = file->private_data;
|
||
|
|
struct circ_buf *fifo = &rd->fifo;
|
||
|
|
const char *fptr = &fifo->buf[fifo->tail];
|
||
|
|
int n = 0, ret = 0;
|
||
|
|
|
||
|
|
mutex_lock(&rd->read_lock);
|
||
|
|
|
||
|
|
ret = wait_event_interruptible(rd->fifo_event,
|
||
|
|
circ_count(&rd->fifo) > 0);
|
||
|
|
if (ret)
|
||
|
|
goto out;
|
||
|
|
|
||
|
|
n = min_t(int, sz, circ_count_to_end(&rd->fifo));
|
||
|
|
ret = copy_to_user(buf, fptr, n);
|
||
|
|
if (ret)
|
||
|
|
goto out;
|
||
|
|
|
||
|
|
fifo->tail = (fifo->tail + n) & (BUF_SZ - 1);
|
||
|
|
*ppos += n;
|
||
|
|
|
||
|
|
wake_up_all(&rd->fifo_event);
|
||
|
|
|
||
|
|
out:
|
||
|
|
mutex_unlock(&rd->read_lock);
|
||
|
|
if (ret)
|
||
|
|
return ret;
|
||
|
|
return n;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int rd_open(struct inode *inode, struct file *file)
|
||
|
|
{
|
||
|
|
struct msm_rd_state *rd = inode->i_private;
|
||
|
|
struct drm_device *dev = rd->dev;
|
||
|
|
struct msm_drm_private *priv = dev->dev_private;
|
||
|
|
struct msm_gpu *gpu = priv->gpu;
|
||
|
|
uint64_t val;
|
||
|
|
uint32_t gpu_id;
|
||
|
|
int ret = 0;
|
||
|
|
|
||
|
|
mutex_lock(&dev->struct_mutex);
|
||
|
|
|
||
|
|
if (rd->open || !gpu) {
|
||
|
|
ret = -EBUSY;
|
||
|
|
goto out;
|
||
|
|
}
|
||
|
|
|
||
|
|
file->private_data = rd;
|
||
|
|
rd->open = true;
|
||
|
|
|
||
|
|
/* the parsing tools need to know gpu-id to know which
|
||
|
|
* register database to load.
|
||
|
|
*/
|
||
|
|
gpu->funcs->get_param(gpu, MSM_PARAM_GPU_ID, &val);
|
||
|
|
gpu_id = val;
|
||
|
|
|
||
|
|
rd_write_section(rd, RD_GPU_ID, &gpu_id, sizeof(gpu_id));
|
||
|
|
|
||
|
|
out:
|
||
|
|
mutex_unlock(&dev->struct_mutex);
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int rd_release(struct inode *inode, struct file *file)
|
||
|
|
{
|
||
|
|
struct msm_rd_state *rd = inode->i_private;
|
||
|
|
rd->open = false;
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
static const struct file_operations rd_debugfs_fops = {
|
||
|
|
.owner = THIS_MODULE,
|
||
|
|
.open = rd_open,
|
||
|
|
.read = rd_read,
|
||
|
|
.llseek = no_llseek,
|
||
|
|
.release = rd_release,
|
||
|
|
};
|
||
|
|
|
||
|
|
int msm_rd_debugfs_init(struct drm_minor *minor)
|
||
|
|
{
|
||
|
|
struct msm_drm_private *priv = minor->dev->dev_private;
|
||
|
|
struct msm_rd_state *rd;
|
||
|
|
|
||
|
|
/* only create on first minor: */
|
||
|
|
if (priv->rd)
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
rd = kzalloc(sizeof(*rd), GFP_KERNEL);
|
||
|
|
if (!rd)
|
||
|
|
return -ENOMEM;
|
||
|
|
|
||
|
|
rd->dev = minor->dev;
|
||
|
|
rd->fifo.buf = rd->buf;
|
||
|
|
|
||
|
|
mutex_init(&rd->read_lock);
|
||
|
|
priv->rd = rd;
|
||
|
|
|
||
|
|
init_waitqueue_head(&rd->fifo_event);
|
||
|
|
|
||
|
|
rd->node = kzalloc(sizeof(*rd->node), GFP_KERNEL);
|
||
|
|
if (!rd->node)
|
||
|
|
goto fail;
|
||
|
|
|
||
|
|
rd->ent = debugfs_create_file("rd", S_IFREG | S_IRUGO,
|
||
|
|
minor->debugfs_root, rd, &rd_debugfs_fops);
|
||
|
|
if (!rd->ent) {
|
||
|
|
DRM_ERROR("Cannot create /sys/kernel/debug/dri/%s/rd\n",
|
||
|
|
minor->debugfs_root->d_name.name);
|
||
|
|
goto fail;
|
||
|
|
}
|
||
|
|
|
||
|
|
rd->node->minor = minor;
|
||
|
|
rd->node->dent = rd->ent;
|
||
|
|
rd->node->info_ent = NULL;
|
||
|
|
|
||
|
|
mutex_lock(&minor->debugfs_lock);
|
||
|
|
list_add(&rd->node->list, &minor->debugfs_list);
|
||
|
|
mutex_unlock(&minor->debugfs_lock);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
fail:
|
||
|
|
msm_rd_debugfs_cleanup(minor);
|
||
|
|
return -1;
|
||
|
|
}
|
||
|
|
|
||
|
|
void msm_rd_debugfs_cleanup(struct drm_minor *minor)
|
||
|
|
{
|
||
|
|
struct msm_drm_private *priv = minor->dev->dev_private;
|
||
|
|
struct msm_rd_state *rd = priv->rd;
|
||
|
|
|
||
|
|
if (!rd)
|
||
|
|
return;
|
||
|
|
|
||
|
|
priv->rd = NULL;
|
||
|
|
|
||
|
|
debugfs_remove(rd->ent);
|
||
|
|
|
||
|
|
if (rd->node) {
|
||
|
|
mutex_lock(&minor->debugfs_lock);
|
||
|
|
list_del(&rd->node->list);
|
||
|
|
mutex_unlock(&minor->debugfs_lock);
|
||
|
|
kfree(rd->node);
|
||
|
|
}
|
||
|
|
|
||
|
|
mutex_destroy(&rd->read_lock);
|
||
|
|
|
||
|
|
kfree(rd);
|
||
|
|
}
|
||
|
|
|
||
|
|
/* called under struct_mutex */
|
||
|
|
void msm_rd_dump_submit(struct msm_gem_submit *submit)
|
||
|
|
{
|
||
|
|
struct drm_device *dev = submit->dev;
|
||
|
|
struct msm_drm_private *priv = dev->dev_private;
|
||
|
|
struct msm_rd_state *rd = priv->rd;
|
||
|
|
char msg[128];
|
||
|
|
int i, n;
|
||
|
|
|
||
|
|
if (!rd->open)
|
||
|
|
return;
|
||
|
|
|
||
|
|
/* writing into fifo is serialized by caller, and
|
||
|
|
* rd->read_lock is used to serialize the reads
|
||
|
|
*/
|
||
|
|
WARN_ON(!mutex_is_locked(&dev->struct_mutex));
|
||
|
|
|
||
|
|
n = snprintf(msg, sizeof(msg), "%.*s/%d: fence=%u",
|
||
|
|
TASK_COMM_LEN, current->comm, task_pid_nr(current),
|
||
|
|
submit->fence);
|
||
|
|
|
||
|
|
rd_write_section(rd, RD_CMD, msg, ALIGN(n, 4));
|
||
|
|
|
||
|
|
/* could be nice to have an option (module-param?) to snapshot
|
||
|
|
* all the bo's associated with the submit. Handy to see vtx
|
||
|
|
* buffers, etc. For now just the cmdstream bo's is enough.
|
||
|
|
*/
|
||
|
|
|
||
|
|
for (i = 0; i < submit->nr_cmds; i++) {
|
||
|
|
uint32_t idx = submit->cmd[i].idx;
|
||
|
|
uint32_t iova = submit->cmd[i].iova;
|
||
|
|
uint32_t szd = submit->cmd[i].size; /* in dwords */
|
||
|
|
struct msm_gem_object *obj = submit->bos[idx].obj;
|
||
|
|
const char *buf = msm_gem_vaddr_locked(&obj->base);
|
||
|
|
|
||
|
|
buf += iova - submit->bos[idx].iova;
|
||
|
|
|
||
|
|
rd_write_section(rd, RD_GPUADDR,
|
||
|
|
(uint32_t[2]){ iova, szd * 4 }, 8);
|
||
|
|
rd_write_section(rd, RD_BUFFER_CONTENTS,
|
||
|
|
buf, szd * 4);
|
||
|
|
|
||
|
|
switch (submit->cmd[i].type) {
|
||
|
|
case MSM_SUBMIT_CMD_IB_TARGET_BUF:
|
||
|
|
/* ignore IB-targets, we've logged the buffer, the
|
||
|
|
* parser tool will follow the IB based on the logged
|
||
|
|
* buffer/gpuaddr, so nothing more to do.
|
||
|
|
*/
|
||
|
|
break;
|
||
|
|
case MSM_SUBMIT_CMD_CTX_RESTORE_BUF:
|
||
|
|
case MSM_SUBMIT_CMD_BUF:
|
||
|
|
rd_write_section(rd, RD_CMDSTREAM_ADDR,
|
||
|
|
(uint32_t[2]){ iova, szd }, 8);
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
#endif
|