Re: [PATCH 2/9] drm/print: add drm_debug_enabled()

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On Friday, 2019-09-13 14:51:39 +0300, Jani Nikula wrote:
> Add helper to check if a drm debug category is enabled. Convert drm core
> to use it. No functional changes.
> 
> Signed-off-by: Jani Nikula <jani.nikula@xxxxxxxxx>
> ---
>  drivers/gpu/drm/drm_atomic_uapi.c     | 2 +-
>  drivers/gpu/drm/drm_dp_mst_topology.c | 6 +++---
>  drivers/gpu/drm/drm_edid.c            | 2 +-
>  drivers/gpu/drm/drm_edid_load.c       | 2 +-
>  drivers/gpu/drm/drm_mipi_dbi.c        | 4 ++--
>  drivers/gpu/drm/drm_print.c           | 4 ++--
>  drivers/gpu/drm/drm_vblank.c          | 6 +++---
>  include/drm/drm_print.h               | 5 +++++
>  8 files changed, 18 insertions(+), 13 deletions(-)
> 
> diff --git a/drivers/gpu/drm/drm_atomic_uapi.c b/drivers/gpu/drm/drm_atomic_uapi.c
> index 5a5b42db6f2a..6576cd997cbd 100644
> --- a/drivers/gpu/drm/drm_atomic_uapi.c
> +++ b/drivers/gpu/drm/drm_atomic_uapi.c
> @@ -1406,7 +1406,7 @@ int drm_mode_atomic_ioctl(struct drm_device *dev,
>  	} else if (arg->flags & DRM_MODE_ATOMIC_NONBLOCK) {
>  		ret = drm_atomic_nonblocking_commit(state);
>  	} else {
> -		if (unlikely(drm_debug & DRM_UT_STATE))
> +		if (unlikely(drm_debug_enabled(DRM_UT_STATE)))
>  			drm_atomic_print_state(state);
>  
>  		ret = drm_atomic_commit(state);
> diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c
> index 97216099a718..f47c5b6b51f7 100644
> --- a/drivers/gpu/drm/drm_dp_mst_topology.c
> +++ b/drivers/gpu/drm/drm_dp_mst_topology.c
> @@ -1180,7 +1180,7 @@ static int drm_dp_mst_wait_tx_reply(struct drm_dp_mst_branch *mstb,
>  		}
>  	}
>  out:
> -	if (unlikely(ret == -EIO && drm_debug & DRM_UT_DP)) {
> +	if (unlikely(ret == -EIO && drm_debug_enabled(DRM_UT_DP))) {
>  		struct drm_printer p = drm_debug_printer(DBG_PREFIX);
>  
>  		drm_dp_mst_dump_sideband_msg_tx(&p, txmsg);
> @@ -2321,7 +2321,7 @@ static int process_single_tx_qlock(struct drm_dp_mst_topology_mgr *mgr,
>  	idx += tosend + 1;
>  
>  	ret = drm_dp_send_sideband_msg(mgr, up, chunk, idx);
> -	if (unlikely(ret && drm_debug & DRM_UT_DP)) {
> +	if (unlikely(ret && drm_debug_enabled(DRM_UT_DP))) {
>  		struct drm_printer p = drm_debug_printer(DBG_PREFIX);
>  
>  		drm_printf(&p, "sideband msg failed to send\n");
> @@ -2388,7 +2388,7 @@ static void drm_dp_queue_down_tx(struct drm_dp_mst_topology_mgr *mgr,
>  	mutex_lock(&mgr->qlock);
>  	list_add_tail(&txmsg->next, &mgr->tx_msg_downq);
>  
> -	if (unlikely(drm_debug & DRM_UT_DP)) {
> +	if (unlikely(drm_debug_enabled(DRM_UT_DP))) {
>  		struct drm_printer p = drm_debug_printer(DBG_PREFIX);
>  
>  		drm_dp_mst_dump_sideband_msg_tx(&p, txmsg);
> diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
> index 12c783f4d956..58dad4d24cd4 100644
> --- a/drivers/gpu/drm/drm_edid.c
> +++ b/drivers/gpu/drm/drm_edid.c
> @@ -1551,7 +1551,7 @@ static void connector_bad_edid(struct drm_connector *connector,
>  {
>  	int i;
>  
> -	if (connector->bad_edid_counter++ && !(drm_debug & DRM_UT_KMS))
> +	if (connector->bad_edid_counter++ && !drm_debug_enabled(DRM_UT_KMS))
>  		return;
>  
>  	dev_warn(connector->dev->dev,
> diff --git a/drivers/gpu/drm/drm_edid_load.c b/drivers/gpu/drm/drm_edid_load.c
> index d38b3b255926..37d8ba3ddb46 100644
> --- a/drivers/gpu/drm/drm_edid_load.c
> +++ b/drivers/gpu/drm/drm_edid_load.c
> @@ -175,7 +175,7 @@ static void *edid_load(struct drm_connector *connector, const char *name,
>  	u8 *edid;
>  	int fwsize, builtin;
>  	int i, valid_extensions = 0;
> -	bool print_bad_edid = !connector->bad_edid_counter || (drm_debug & DRM_UT_KMS);
> +	bool print_bad_edid = !connector->bad_edid_counter || drm_debug_enabled(DRM_UT_KMS);
>  
>  	builtin = match_string(generic_edid_name, GENERIC_EDIDS, name);
>  	if (builtin >= 0) {
> diff --git a/drivers/gpu/drm/drm_mipi_dbi.c b/drivers/gpu/drm/drm_mipi_dbi.c
> index f8154316a3b0..ccfb5b33c5e3 100644
> --- a/drivers/gpu/drm/drm_mipi_dbi.c
> +++ b/drivers/gpu/drm/drm_mipi_dbi.c
> @@ -783,7 +783,7 @@ static int mipi_dbi_spi1e_transfer(struct mipi_dbi *dbi, int dc,
>  	int i, ret;
>  	u8 *dst;
>  
> -	if (drm_debug & DRM_UT_DRIVER)
> +	if (drm_debug_enabled(DRM_UT_DRIVER))
>  		pr_debug("[drm:%s] dc=%d, max_chunk=%zu, transfers:\n",
>  			 __func__, dc, max_chunk);
>  
> @@ -907,7 +907,7 @@ static int mipi_dbi_spi1_transfer(struct mipi_dbi *dbi, int dc,
>  	max_chunk = dbi->tx_buf9_len;
>  	dst16 = dbi->tx_buf9;
>  
> -	if (drm_debug & DRM_UT_DRIVER)
> +	if (drm_debug_enabled(DRM_UT_DRIVER))
>  		pr_debug("[drm:%s] dc=%d, max_chunk=%zu, transfers:\n",
>  			 __func__, dc, max_chunk);
>  
> diff --git a/drivers/gpu/drm/drm_print.c b/drivers/gpu/drm/drm_print.c
> index c9b57012d412..a7c89ec5ff26 100644
> --- a/drivers/gpu/drm/drm_print.c
> +++ b/drivers/gpu/drm/drm_print.c
> @@ -264,7 +264,7 @@ void drm_dev_dbg(const struct device *dev, unsigned int category,
>  	struct va_format vaf;
>  	va_list args;
>  
> -	if (!(drm_debug & category))
> +	if (!drm_debug_enabled(category))
>  		return;
>  
>  	va_start(args, format);
> @@ -287,7 +287,7 @@ void drm_dbg(unsigned int category, const char *format, ...)
>  	struct va_format vaf;
>  	va_list args;
>  
> -	if (!(drm_debug & category))
> +	if (!drm_debug_enabled(category))
>  		return;
>  
>  	va_start(args, format);
> diff --git a/drivers/gpu/drm/drm_vblank.c b/drivers/gpu/drm/drm_vblank.c
> index 9c6899758bc9..4f7962b6427b 100644
> --- a/drivers/gpu/drm/drm_vblank.c
> +++ b/drivers/gpu/drm/drm_vblank.c
> @@ -332,7 +332,7 @@ u64 drm_crtc_accurate_vblank_count(struct drm_crtc *crtc)
>  	u64 vblank;
>  	unsigned long flags;
>  
> -	WARN_ONCE(drm_debug & DRM_UT_VBL && !dev->driver->get_vblank_timestamp,
> +	WARN_ONCE(drm_debug_enabled(DRM_UT_VBL) && !dev->driver->get_vblank_timestamp,
>  		  "This function requires support for accurate vblank timestamps.");
>  
>  	spin_lock_irqsave(&dev->vblank_time_lock, flags);
> @@ -706,7 +706,7 @@ bool drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev,
>  	 */
>  	*vblank_time = ktime_sub_ns(etime, delta_ns);
>  
> -	if ((drm_debug & DRM_UT_VBL) == 0)
> +	if (!drm_debug_enabled(DRM_UT_VBL))
>  		return true;
>  
>  	ts_etime = ktime_to_timespec64(etime);
> @@ -1352,7 +1352,7 @@ void drm_vblank_restore(struct drm_device *dev, unsigned int pipe)
>  	assert_spin_locked(&dev->vblank_time_lock);
>  
>  	vblank = &dev->vblank[pipe];
> -	WARN_ONCE((drm_debug & DRM_UT_VBL) && !vblank->framedur_ns,
> +	WARN_ONCE(drm_debug_enabled(DRM_UT_VBL) && !vblank->framedur_ns,
>  		  "Cannot compute missed vblanks without frame duration\n");
>  	framedur_ns = vblank->framedur_ns;
>  
> diff --git a/include/drm/drm_print.h b/include/drm/drm_print.h
> index e5c421abce48..e13f901312a4 100644
> --- a/include/drm/drm_print.h
> +++ b/include/drm/drm_print.h
> @@ -294,6 +294,11 @@ static inline struct drm_printer drm_err_printer(const char *prefix)
>  #define DRM_UT_LEASE		0x80
>  #define DRM_UT_DP		0x100
>  
> +static inline bool drm_debug_enabled(unsigned int category)
> +{
> +	return drm_debug & category;

Worth making that `return unlikely(drm_debug & category);` to make sure
the preloaded path is always to skip the debug stuff?

> +}
> +
>  __printf(3, 4)
>  void drm_dev_printk(const struct device *dev, const char *level,
>  		    const char *format, ...);
> -- 
> 2.20.1
> 
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