diff options
Diffstat (limited to 'drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c')
| -rw-r--r-- | drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c | 39 |
1 files changed, 36 insertions, 3 deletions
diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c index e79ac1e2c460..35ca732f7ffe 100644 --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c @@ -720,16 +720,49 @@ int connector_debugfs_init(struct amdgpu_dm_connector *connector) return 0; } +/* + * Writes DTN log state to the user supplied buffer. + * Example usage: cat /sys/kernel/debug/dri/0/amdgpu_dm_dtn_log + */ static ssize_t dtn_log_read( struct file *f, char __user *buf, size_t size, loff_t *pos) { - /* TODO: Write log output to the user supplied buffer. */ - return 0; + struct amdgpu_device *adev = file_inode(f)->i_private; + struct dc *dc = adev->dm.dc; + struct dc_log_buffer_ctx log_ctx = { 0 }; + ssize_t result = 0; + + if (!buf || !size) + return -EINVAL; + + if (!dc->hwss.log_hw_state) + return 0; + + dc->hwss.log_hw_state(dc, &log_ctx); + + if (*pos < log_ctx.pos) { + size_t to_copy = log_ctx.pos - *pos; + + to_copy = min(to_copy, size); + + if (!copy_to_user(buf, log_ctx.buf + *pos, to_copy)) { + *pos += to_copy; + result = to_copy; + } + } + + kfree(log_ctx.buf); + + return result; } +/* + * Writes DTN log state to dmesg when triggered via a write. + * Example usage: echo 1 > /sys/kernel/debug/dri/0/amdgpu_dm_dtn_log + */ static ssize_t dtn_log_write( struct file *f, const char __user *buf, @@ -744,7 +777,7 @@ static ssize_t dtn_log_write( return 0; if (dc->hwss.log_hw_state) - dc->hwss.log_hw_state(dc); + dc->hwss.log_hw_state(dc, NULL); return size; } |