Export /sys/class/drm/cardX/device/error sysfs for user read out error task dump file.
Signed-off-by: Qiang Yu yuq825@gmail.com --- drivers/gpu/drm/lima/lima_drv.c | 93 +++++++++++++++++++++++++++++++++ 1 file changed, 93 insertions(+)
diff --git a/drivers/gpu/drm/lima/lima_drv.c b/drivers/gpu/drm/lima/lima_drv.c index e235d4545b6c..8c5adc025902 100644 --- a/drivers/gpu/drm/lima/lima_drv.c +++ b/drivers/gpu/drm/lima/lima_drv.c @@ -276,6 +276,92 @@ 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 = S_IRUSR | S_IWUSR, + .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 +404,11 @@ 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 +425,8 @@ 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);