[Intel-gfx] [PATCH 5/5] drm: Use names of ioctls in debug traces

[Ville Syrjälä]

On Wed, May 08, 2013 at 05:03:34PM +0100, Damien Lespiau wrote:
> From: Chris Cummins <christopher.e.cummins at intel.com>
> 
> The intention here is to make the output of dmesg with full verbosity a
> bit easier for a human to parse. This commit transforms:
> 
> [drm:drm_ioctl], pid=699, cmd=0x6458, nr=0x58, dev 0xe200, auth=1
> [drm:drm_ioctl], pid=699, cmd=0xc010645b, nr=0x5b, dev 0xe200, auth=1
> [drm:drm_ioctl], pid=699, cmd=0xc0106461, nr=0x61, dev 0xe200, auth=1
> [drm:drm_ioctl], pid=699, cmd=0xc01c64ae, nr=0xae, dev 0xe200, auth=1
> [drm:drm_mode_addfb], [FB:32]
> [drm:drm_ioctl], pid=699, cmd=0xc0106464, nr=0x64, dev 0xe200, auth=1
> [drm:drm_vm_open_locked], 0x7fd9302fe000,0x00a00000
> [drm:drm_ioctl], pid=699, cmd=0x400c645f, nr=0x5f, dev 0xe200, auth=1
> [drm:drm_ioctl], pid=699, cmd=0xc00464af, nr=0xaf, dev 0xe200, auth=1
> [drm:intel_crtc_set_config], [CRTC:3] [NOFB]
> 
> into:
> 
> [drm:drm_ioctl], pid=699, dev=0xe200, auth=1, I915_GEM_THROTTLE
> [drm:drm_ioctl], pid=699, dev=0xe200, auth=1, I915_GEM_CREATE
> [drm:drm_ioctl], pid=699, dev=0xe200, auth=1, I915_GEM_SET_TILING
> [drm:drm_ioctl], pid=699, dev=0xe200, auth=1, IOCTL_MODE_ADDFB
> [drm:drm_mode_addfb], [FB:32]
> [drm:drm_ioctl], pid=699, dev=0xe200, auth=1, I915_GEM_MMAP_GTT
> [drm:drm_vm_open_locked], 0x7fd9302fe000,0x00a00000
> [drm:drm_ioctl], pid=699, dev=0xe200, auth=1, I915_GEM_SET_DOMAIN
> [drm:drm_ioctl], pid=699, dev=0xe200, auth=1, DRM_IOCTL_MODE_RMFB
> [drm:intel_crtc_set_config], [CRTC:3] [NOFB]

I like it. But I made drm_ioctls const recently so the patch needs a
small refresh.

BTW am I the only one who hates the DRM_IOCTL_DEF_DRV() macro? Thanks to
the cpp magic it's difficult to look up the ioctls using cscope. OTOH
with this patch looking up the numbers does become less important.

> Signed-off-by: Chris Cummins <christopher.e.cummins at intel.com>
> ---
>  drivers/gpu/drm/drm_drv.c | 20 +++++++++++++-------
>  include/drm/drmP.h        |  3 ++-
>  2 files changed, 15 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/gpu/drm/drm_drv.c b/drivers/gpu/drm/drm_drv.c
> index 25f91cd..0382f6e 100644
> --- a/drivers/gpu/drm/drm_drv.c
> +++ b/drivers/gpu/drm/drm_drv.c
> @@ -57,7 +57,7 @@ static int drm_version(struct drm_device *dev, void *data,
>  		       struct drm_file *file_priv);
>  
>  #define DRM_IOCTL_DEF(ioctl, _func, _flags) \
> -	[DRM_IOCTL_NR(ioctl)] = {.cmd = ioctl, .func = _func, .flags = _flags, .cmd_drv = 0}
> +	[DRM_IOCTL_NR(ioctl)] = {.cmd = ioctl, .func = _func, .flags = _flags, .cmd_drv = 0, .name = #ioctl}
>  
>  /** Ioctl table */
>  static struct drm_ioctl_desc drm_ioctls[] = {
> @@ -375,7 +375,7 @@ long drm_ioctl(struct file *filp,
>  {
>  	struct drm_file *file_priv = filp->private_data;
>  	struct drm_device *dev;
> -	struct drm_ioctl_desc *ioctl;
> +	struct drm_ioctl_desc *ioctl = NULL;
>  	drm_ioctl_t *func;
>  	unsigned int nr = DRM_IOCTL_NR(cmd);
>  	int retcode = -EINVAL;
> @@ -392,11 +392,6 @@ long drm_ioctl(struct file *filp,
>  	atomic_inc(&dev->counts[_DRM_STAT_IOCTLS]);
>  	++file_priv->ioctl_count;
>  
> -	DRM_DEBUG("pid=%d, cmd=0x%02x, nr=0x%02x, dev 0x%lx, auth=%d\n",
> -		  task_pid_nr(current), cmd, nr,
> -		  (long)old_encode_dev(file_priv->minor->device),
> -		  file_priv->authenticated);
> -
>  	if ((nr >= DRM_CORE_IOCTL_COUNT) &&
>  	    ((nr < DRM_COMMAND_BASE) || (nr >= DRM_COMMAND_END)))
>  		goto err_i1;
> @@ -416,6 +411,11 @@ long drm_ioctl(struct file *filp,
>  	} else
>  		goto err_i1;
>  
> +	DRM_DEBUG("pid=%d, dev=0x%lx, auth=%d, %s\n",
> +		  task_pid_nr(current),
> +		  (long)old_encode_dev(file_priv->minor->device),
> +		  file_priv->authenticated, ioctl->name);
> +
>  	/* Do not trust userspace, use our own definition */
>  	func = ioctl->func;
>  	/* is there a local override? */
> @@ -470,6 +470,12 @@ long drm_ioctl(struct file *filp,
>  	}
>  
>        err_i1:
> +	if (!ioctl)
> +		DRM_DEBUG("invalid iotcl: pid=%d, dev=0x%lx, auth=%d, cmd=0x%02x, nr=0x%02x\n",
> +			  task_pid_nr(current),
> +			  (long)old_encode_dev(file_priv->minor->device),
> +			  file_priv->authenticated, cmd, nr);
> +
>  	if (kdata != stack_kdata)
>  		kfree(kdata);
>  	atomic_dec(&dev->ioctl_count);
> diff --git a/include/drm/drmP.h b/include/drm/drmP.h
> index 2d94d74..379787c 100644
> --- a/include/drm/drmP.h
> +++ b/include/drm/drmP.h
> @@ -316,6 +316,7 @@ struct drm_ioctl_desc {
>  	int flags;
>  	drm_ioctl_t *func;
>  	unsigned int cmd_drv;
> +	const char *name;
>  };
>  
>  /**
> @@ -324,7 +325,7 @@ struct drm_ioctl_desc {
>   */
>  
>  #define DRM_IOCTL_DEF_DRV(ioctl, _func, _flags)			\
> -	[DRM_IOCTL_NR(DRM_##ioctl)] = {.cmd = DRM_##ioctl, .func = _func, .flags = _flags, .cmd_drv = DRM_IOCTL_##ioctl}
> +	[DRM_IOCTL_NR(DRM_##ioctl)] = {.cmd = DRM_##ioctl, .func = _func, .flags = _flags, .cmd_drv = DRM_IOCTL_##ioctl, .name = #ioctl}
>  
>  struct drm_magic_entry {
>  	struct list_head head;
> -- 
> 1.8.1.4
> 
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-- 
Ville Syrjälä
Intel OTC