blob: ec56794ad0399277693b9185c75b6abcf9241e4a [file] [log] [blame]
/*
* 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.
*
* The module-param "rd_full", which defaults to false, enables snapshotting
* all (non-written) buffers in the submit, rather than just cmdstream bo's.
* This is useful to capture the contents of (for example) vbo's or textures,
* or shader programs (if not emitted inline in cmdstream).
*/
#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"
static bool rd_full = false;
MODULE_PARM_DESC(rd_full, "If true, $debugfs/.../rd will snapshot all buffer contents");
module_param_named(rd_full, rd_full, bool, 0600);
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;
/* 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);
/* Note that smp_load_acquire() is not strictly required
* as CIRC_SPACE_TO_END() does not access the tail more
* than once.
*/
n = min(sz, circ_space_to_end(&rd->fifo));
memcpy(fptr, ptr, n);
smp_store_release(&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;
/* Note that smp_load_acquire() is not strictly required
* as CIRC_CNT_TO_END() does not access the head more than
* once.
*/
n = min_t(int, sz, circ_count_to_end(&rd->fifo));
if (copy_to_user(buf, fptr, n)) {
ret = -EFAULT;
goto out;
}
smp_store_release(&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;
struct dentry *ent;
/* 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);
ent = debugfs_create_file("rd", S_IFREG | S_IRUGO,
minor->debugfs_root, rd, &rd_debugfs_fops);
if (!ent) {
DRM_ERROR("Cannot create /sys/kernel/debug/dri/%pd/rd\n",
minor->debugfs_root);
goto fail;
}
return 0;
fail:
msm_rd_debugfs_cleanup(priv);
return -1;
}
void msm_rd_debugfs_cleanup(struct msm_drm_private *priv)
{
struct msm_rd_state *rd = priv->rd;
if (!rd)
return;
priv->rd = NULL;
mutex_destroy(&rd->read_lock);
kfree(rd);
}
static void snapshot_buf(struct msm_rd_state *rd,
struct msm_gem_submit *submit, int idx,
uint64_t iova, uint32_t size)
{
struct msm_gem_object *obj = submit->bos[idx].obj;
const char *buf;
buf = msm_gem_get_vaddr(&obj->base);
if (IS_ERR(buf))
return;
if (iova) {
buf += iova - submit->bos[idx].iova;
} else {
iova = submit->bos[idx].iova;
size = obj->base.size;
}
rd_write_section(rd, RD_GPUADDR,
(uint32_t[3]){ iova, size, iova >> 32 }, 12);
rd_write_section(rd, RD_BUFFER_CONTENTS, buf, size);
msm_gem_put_vaddr(&obj->base);
}
/* 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->seqno);
rd_write_section(rd, RD_CMD, msg, ALIGN(n, 4));
if (rd_full) {
for (i = 0; i < submit->nr_bos; i++) {
/* buffers that are written to probably don't start out
* with anything interesting:
*/
if (submit->bos[i].flags & MSM_SUBMIT_BO_WRITE)
continue;
snapshot_buf(rd, submit, i, 0, 0);
}
}
for (i = 0; i < submit->nr_cmds; i++) {
uint64_t iova = submit->cmd[i].iova;
uint32_t szd = submit->cmd[i].size; /* in dwords */
/* snapshot cmdstream bo's (if we haven't already): */
if (!rd_full) {
snapshot_buf(rd, submit, submit->cmd[i].idx,
submit->cmd[i].iova, 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[3]){ iova, szd, iova >> 32 }, 12);
break;
}
}
}
#endif