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drm/lima: add error sysfs to export error task dump 

Export /sys/class/drm/cardX/device/error sysfs for user read out
error task dump file.

Tested-by: Andreas Baierl <ichgeh@imkreisrum.de>
Reviewed-by: Vasily Khoruzhick <anarsoul@gmail.com>
Signed-off-by: Qiang Yu <yuq825@gmail.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200222024210.18697-5-yuq825@gmail.com
This commit is contained in:
Qiang Yu 2020-02-22 10:42:09 +08:00
parent b78edd46f6
commit 57b517cece
1 changed files with 94 additions and 0 deletions
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94
drivers/gpu/drm/lima/lima_drv.c
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@ -276,6 +276,93 @@ static struct drm_driver lima_drm_driver = {
.gem_prime_mmap = drm_gem_prime_mmap,
};
struct lima_block_reader {
void *dst;
size_t base;
size_t count;
size_t off;
ssize_t read;
};
static bool lima_read_block(struct lima_block_reader *reader,
void *src, size_t src_size)
{
size_t max_off = reader->base + src_size;
if (reader->off < max_off) {
size_t size = min_t(size_t, max_off - reader->off,
reader->count);
memcpy(reader->dst, src + (reader->off - reader->base), size);
reader->dst += size;
reader->off += size;
reader->read += size;
reader->count -= size;
}
reader->base = max_off;
return !!reader->count;
}
static ssize_t lima_error_state_read(struct file *filp, struct kobject *kobj,
struct bin_attribute *attr, char *buf,
loff_t off, size_t count)
{
struct device *dev = kobj_to_dev(kobj);
struct lima_device *ldev = dev_get_drvdata(dev);
struct lima_sched_error_task *et;
struct lima_block_reader reader = {
.dst = buf,
.count = count,
.off = off,
};
mutex_lock(&ldev->error_task_list_lock);
if (lima_read_block(&reader, &ldev->dump, sizeof(ldev->dump))) {
list_for_each_entry(et, &ldev->error_task_list, list) {
if (!lima_read_block(&reader, et->data, et->size))
break;
}
}
mutex_unlock(&ldev->error_task_list_lock);
return reader.read;
}
static ssize_t lima_error_state_write(struct file *file, struct kobject *kobj,
struct bin_attribute *attr, char *buf,
loff_t off, size_t count)
{
struct device *dev = kobj_to_dev(kobj);
struct lima_device *ldev = dev_get_drvdata(dev);
struct lima_sched_error_task *et, *tmp;
mutex_lock(&ldev->error_task_list_lock);
list_for_each_entry_safe(et, tmp, &ldev->error_task_list, list) {
list_del(&et->list);
kvfree(et);
}
ldev->dump.size = 0;
ldev->dump.num_tasks = 0;
mutex_unlock(&ldev->error_task_list_lock);
return count;
}
static const struct bin_attribute lima_error_state_attr = {
.attr.name = "error",
.attr.mode = 0600,
.size = 0,
.read = lima_error_state_read,
.write = lima_error_state_write,
};
static int lima_pdev_probe(struct platform_device *pdev)
{
struct lima_device *ldev;
@ -318,6 +405,11 @@ static int lima_pdev_probe(struct platform_device *pdev)
if (err < 0)
goto err_out2;
platform_set_drvdata(pdev, ldev);
if (sysfs_create_bin_file(&ldev->dev->kobj, &lima_error_state_attr))
dev_warn(ldev->dev, "fail to create error state sysfs\n");
return 0;
err_out2:
@ -334,6 +426,8 @@ static int lima_pdev_remove(struct platform_device *pdev)
struct lima_device *ldev = platform_get_drvdata(pdev);
struct drm_device *ddev = ldev->ddev;
sysfs_remove_bin_file(&ldev->dev->kobj, &lima_error_state_attr);
platform_set_drvdata(pdev, NULL);
drm_dev_unregister(ddev);
lima_device_fini(ldev);
drm_dev_put(ddev);