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