Author | Tokens | Token Proportion | Commits | Commit Proportion |
---|---|---|---|---|
Rob Clark | 1684 | 95.90% | 25 | 73.53% |
Jordan Crouse | 28 | 1.59% | 3 | 8.82% |
Kristian H. Kristensen | 13 | 0.74% | 1 | 2.94% |
Dmitry Eremin-Solenikov | 10 | 0.57% | 1 | 2.94% |
Dan Carpenter | 9 | 0.51% | 1 | 2.94% |
Sam Ravnborg | 5 | 0.28% | 1 | 2.94% |
Noralf Trönnes | 5 | 0.28% | 1 | 2.94% |
Thomas Gleixner | 2 | 0.11% | 1 | 2.94% |
Total | 1756 | 34 |
// SPDX-License-Identifier: GPL-2.0-only /* * Copyright (C) 2013 Red Hat * Author: Rob Clark <robdclark@gmail.com> */ /* 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. * * Additionally: * * tail -f /sys/kernel/debug/dri/<minor>/hangrd > logfile.rd * * will capture just the cmdstream from submits which triggered a GPU hang. * * 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). */ #include <linux/circ_buf.h> #include <linux/debugfs.h> #include <linux/kfifo.h> #include <linux/uaccess.h> #include <linux/wait.h> #include <drm/drm_file.h> #include "msm_drv.h" #include "msm_gpu.h" #include "msm_gem.h" 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); #ifdef CONFIG_DEBUG_FS 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, RD_CHIP_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; /* fifo access is synchronized on the producer side by * write_lock. And read_lock synchronizes the reads */ struct mutex read_lock, write_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 || !rd->open); if (!rd->open) return; /* 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; uint32_t zero = 0; int ret = 0; if (!gpu) return -ENODEV; mutex_lock(&gpu->lock); if (rd->open) { ret = -EBUSY; goto out; } file->private_data = rd; rd->open = true; /* Reset fifo to clear any previously unread data: */ rd->fifo.head = rd->fifo.tail = 0; /* the parsing tools need to know gpu-id to know which * register database to load. * * Note: These particular params do not require a context */ gpu->funcs->get_param(gpu, NULL, MSM_PARAM_GPU_ID, &val, &zero); gpu_id = val; rd_write_section(rd, RD_GPU_ID, &gpu_id, sizeof(gpu_id)); gpu->funcs->get_param(gpu, NULL, MSM_PARAM_CHIP_ID, &val, &zero); rd_write_section(rd, RD_CHIP_ID, &val, sizeof(val)); out: mutex_unlock(&gpu->lock); return ret; } static int rd_release(struct inode *inode, struct file *file) { struct msm_rd_state *rd = inode->i_private; rd->open = false; wake_up_all(&rd->fifo_event); 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, }; static void rd_cleanup(struct msm_rd_state *rd) { if (!rd) return; mutex_destroy(&rd->read_lock); mutex_destroy(&rd->write_lock); kfree(rd); } static struct msm_rd_state *rd_init(struct drm_minor *minor, const char *name) { struct msm_rd_state *rd; rd = kzalloc(sizeof(*rd), GFP_KERNEL); if (!rd) return ERR_PTR(-ENOMEM); rd->dev = minor->dev; rd->fifo.buf = rd->buf; mutex_init(&rd->read_lock); mutex_init(&rd->write_lock); init_waitqueue_head(&rd->fifo_event); debugfs_create_file(name, S_IFREG | S_IRUGO, minor->debugfs_root, rd, &rd_debugfs_fops); return rd; } int msm_rd_debugfs_init(struct drm_minor *minor) { struct msm_drm_private *priv = minor->dev->dev_private; struct msm_rd_state *rd; int ret; if (!priv->gpu_pdev) return 0; /* only create on first minor: */ if (priv->rd) return 0; rd = rd_init(minor, "rd"); if (IS_ERR(rd)) { ret = PTR_ERR(rd); goto fail; } priv->rd = rd; rd = rd_init(minor, "hangrd"); if (IS_ERR(rd)) { ret = PTR_ERR(rd); goto fail; } priv->hangrd = rd; return 0; fail: msm_rd_debugfs_cleanup(priv); return ret; } void msm_rd_debugfs_cleanup(struct msm_drm_private *priv) { rd_cleanup(priv->rd); priv->rd = NULL; rd_cleanup(priv->hangrd); priv->hangrd = NULL; } static void snapshot_buf(struct msm_rd_state *rd, struct msm_gem_submit *submit, int idx, uint64_t iova, uint32_t size, bool full) { struct drm_gem_object *obj = submit->bos[idx].obj; unsigned offset = 0; const char *buf; if (iova) { offset = iova - submit->bos[idx].iova; } else { iova = submit->bos[idx].iova; size = obj->size; } /* * Always write the GPUADDR header so can get a complete list of all the * buffers in the cmd */ rd_write_section(rd, RD_GPUADDR, (uint32_t[3]){ iova, size, iova >> 32 }, 12); if (!full) return; /* But only dump the contents of buffers marked READ */ if (!(submit->bos[idx].flags & MSM_SUBMIT_BO_READ)) return; buf = msm_gem_get_vaddr_active(obj); if (IS_ERR(buf)) return; buf += offset; rd_write_section(rd, RD_BUFFER_CONTENTS, buf, size); msm_gem_put_vaddr_locked(obj); } /* called under gpu->lock */ void msm_rd_dump_submit(struct msm_rd_state *rd, struct msm_gem_submit *submit, const char *fmt, ...) { struct task_struct *task; char msg[256]; int i, n; if (!rd->open) return; mutex_lock(&rd->write_lock); if (fmt) { va_list args; va_start(args, fmt); n = vscnprintf(msg, sizeof(msg), fmt, args); va_end(args); rd_write_section(rd, RD_CMD, msg, ALIGN(n, 4)); } rcu_read_lock(); task = pid_task(submit->pid, PIDTYPE_PID); if (task) { n = scnprintf(msg, sizeof(msg), "%.*s/%d: fence=%u", TASK_COMM_LEN, task->comm, pid_nr(submit->pid), submit->seqno); } else { n = scnprintf(msg, sizeof(msg), "???/%d: fence=%u", pid_nr(submit->pid), submit->seqno); } rcu_read_unlock(); rd_write_section(rd, RD_CMD, msg, ALIGN(n, 4)); for (i = 0; i < submit->nr_bos; i++) snapshot_buf(rd, submit, i, 0, 0, should_dump(submit, i)); for (i = 0; i < submit->nr_cmds; i++) { uint32_t szd = submit->cmd[i].size; /* in dwords */ /* snapshot cmdstream bo's (if we haven't already): */ if (!should_dump(submit, i)) { snapshot_buf(rd, submit, submit->cmd[i].idx, submit->cmd[i].iova, szd * 4, true); } } for (i = 0; i < submit->nr_cmds; i++) { uint64_t iova = submit->cmd[i].iova; uint32_t szd = submit->cmd[i].size; /* in dwords */ 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; } } mutex_unlock(&rd->write_lock); } #endif
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