Comments say macros DRM_DEBUG_* are deprecated in favor of drm_dbg_*(NULL, ...), but they have broken support for it, as the macro will result in `(NULL) ? (NULL)->dev : NULL`. Thus, fix them by separating logic to get dev ptr in a new function, which will return the dev ptr if arg is not NULL. Use it in drm_dbg_*, and also in __DRM_DEFINE_DBG_RATELIMITED, where a similar (but correct) NULL check was in place. Also, add support for NULL in __drm_printk, so that all the drm_* macros will hence support NULL as the first argument. This also means that deprecation comments mentioning pr_()* can now be changed to the drm equivalents. There is a need to support device pointers, as in some cases, we may not have drm_device but just the device ptr, such as when dealing with struct mipi_dsi_host. Before this change, passing just mipi_dsi_host would have worked, since due to preprocessing, the resultant would be "host->dev", but now due to NULL check that cannot happen. Signed-off-by: Siddh Raman Pant <code@xxxxxxxx> --- include/drm/drm_print.h | 101 +++++++++++++++++++++++++++++----------- 1 file changed, 73 insertions(+), 28 deletions(-) diff --git a/include/drm/drm_print.h b/include/drm/drm_print.h index a44fb7ef257f..df791cd747da 100644 --- a/include/drm/drm_print.h +++ b/include/drm/drm_print.h @@ -34,6 +34,7 @@ #include <linux/dynamic_debug.h> #include <drm/drm.h> +#include <drm/drm_device.h> /* Do *not* use outside of drm_print.[ch]! */ extern unsigned long __drm_debug; @@ -451,9 +452,52 @@ void __drm_dev_dbg(struct _ddebug *desc, const struct device *dev, * Prefer drm_device based logging over device or prink based logging. */ -/* Helper for struct drm_device based logging. */ +/** + * ___drm_get_dev_ptr - Helper function to get device pointer. + * @ptr: struct drm_device pointer, struct device pointer, or NULL. + * @is_drm: True implies @ptr is drm_device pointer, else device pointer. + * + * RETURNS: + * The device pointer (NULL if @ptr is NULL). + */ +static inline struct device *___drm_get_dev_ptr(const void *ptr, bool is_drm) +{ + if (!ptr) + return NULL; + + if (is_drm) + return ((struct drm_device *)ptr)->dev; + + return (struct device *)ptr; +} + +/** + * __drm_get_dev_ptr - Helper to get device pointer even if NULL is passed. + * Primarily for use in drm_*() print macros, since they + * need to handle NULL as the first argument passed. + */ +#define __drm_get_dev_ptr(drm) \ + _Generic((drm), \ + struct drm_device * : \ + __drm_get_dev_ptr((drm), true), \ + struct device * : \ + __drm_get_dev_ptr((drm), false), \ + default : \ + NULL \ + ) + +/** + * Helper for struct drm_device based logging (prefer this over struct device). + * Also supports struct device ptr as an argument for edge cases. + */ #define __drm_printk(drm, level, type, fmt, ...) \ - dev_##level##type((drm)->dev, "[drm] " fmt, ##__VA_ARGS__) +({ \ + struct device *__dev_ = __drm_get_dev_ptr(drm); \ + if (__dev_) \ + dev_##level##type(__dev_, "[drm] " fmt, ##__VA_ARGS__); \ + else \ + pr_##level##type("[drm] " fmt, ##__VA_ARGS__); \ +}) #define drm_info(drm, fmt, ...) \ @@ -487,25 +531,25 @@ void __drm_dev_dbg(struct _ddebug *desc, const struct device *dev, #define drm_dbg_core(drm, fmt, ...) \ - drm_dev_dbg((drm) ? (drm)->dev : NULL, DRM_UT_CORE, fmt, ##__VA_ARGS__) -#define drm_dbg_driver(drm, fmt, ...) \ - drm_dev_dbg((drm) ? (drm)->dev : NULL, DRM_UT_DRIVER, fmt, ##__VA_ARGS__) + drm_dev_dbg(__drm_get_dev_ptr(drm), DRM_UT_CORE, fmt, ##__VA_ARGS__) +#define drm_dbg_driver(drm, fmt, ...) \ + drm_dev_dbg(__drm_get_dev_ptr(drm), DRM_UT_DRIVER, fmt, ##__VA_ARGS__) #define drm_dbg_kms(drm, fmt, ...) \ - drm_dev_dbg((drm) ? (drm)->dev : NULL, DRM_UT_KMS, fmt, ##__VA_ARGS__) + drm_dev_dbg(__drm_get_dev_ptr(drm), DRM_UT_KMS, fmt, ##__VA_ARGS__) #define drm_dbg_prime(drm, fmt, ...) \ - drm_dev_dbg((drm) ? (drm)->dev : NULL, DRM_UT_PRIME, fmt, ##__VA_ARGS__) + drm_dev_dbg(__drm_get_dev_ptr(drm), DRM_UT_PRIME, fmt, ##__VA_ARGS__) #define drm_dbg_atomic(drm, fmt, ...) \ - drm_dev_dbg((drm) ? (drm)->dev : NULL, DRM_UT_ATOMIC, fmt, ##__VA_ARGS__) + drm_dev_dbg(__drm_get_dev_ptr(drm), DRM_UT_ATOMIC, fmt, ##__VA_ARGS__) #define drm_dbg_vbl(drm, fmt, ...) \ - drm_dev_dbg((drm) ? (drm)->dev : NULL, DRM_UT_VBL, fmt, ##__VA_ARGS__) + drm_dev_dbg(__drm_get_dev_ptr(drm), DRM_UT_VBL, fmt, ##__VA_ARGS__) #define drm_dbg_state(drm, fmt, ...) \ - drm_dev_dbg((drm) ? (drm)->dev : NULL, DRM_UT_STATE, fmt, ##__VA_ARGS__) + drm_dev_dbg(__drm_get_dev_ptr(drm), DRM_UT_STATE, fmt, ##__VA_ARGS__) #define drm_dbg_lease(drm, fmt, ...) \ - drm_dev_dbg((drm) ? (drm)->dev : NULL, DRM_UT_LEASE, fmt, ##__VA_ARGS__) + drm_dev_dbg(__drm_get_dev_ptr(drm), DRM_UT_LEASE, fmt, ##__VA_ARGS__) #define drm_dbg_dp(drm, fmt, ...) \ - drm_dev_dbg((drm) ? (drm)->dev : NULL, DRM_UT_DP, fmt, ##__VA_ARGS__) + drm_dev_dbg(__drm_get_dev_ptr(drm), DRM_UT_DP, fmt, ##__VA_ARGS__) #define drm_dbg_drmres(drm, fmt, ...) \ - drm_dev_dbg((drm) ? (drm)->dev : NULL, DRM_UT_DRMRES, fmt, ##__VA_ARGS__) + drm_dev_dbg(__drm_get_dev_ptr(drm), DRM_UT_DRMRES, fmt, ##__VA_ARGS__) #define drm_dbg(drm, fmt, ...) drm_dbg_driver(drm, fmt, ##__VA_ARGS__) @@ -533,31 +577,31 @@ void __drm_err(const char *format, ...); #define _DRM_PRINTK(once, level, fmt, ...) \ printk##once(KERN_##level "[" DRM_NAME "] " fmt, ##__VA_ARGS__) -/* NOTE: this is deprecated in favor of pr_info(). */ +/* NOTE: this is deprecated in favor of drm_info(NULL, ...). */ #define DRM_INFO(fmt, ...) \ _DRM_PRINTK(, INFO, fmt, ##__VA_ARGS__) -/* NOTE: this is deprecated in favor of pr_notice(). */ +/* NOTE: this is deprecated in favor of drm_notice(NULL, ...). */ #define DRM_NOTE(fmt, ...) \ _DRM_PRINTK(, NOTICE, fmt, ##__VA_ARGS__) -/* NOTE: this is deprecated in favor of pr_warn(). */ +/* NOTE: this is deprecated in favor of drm_warn(NULL, ...). */ #define DRM_WARN(fmt, ...) \ _DRM_PRINTK(, WARNING, fmt, ##__VA_ARGS__) -/* NOTE: this is deprecated in favor of pr_info_once(). */ +/* NOTE: this is deprecated in favor of drm_info_once(NULL, ...). */ #define DRM_INFO_ONCE(fmt, ...) \ _DRM_PRINTK(_once, INFO, fmt, ##__VA_ARGS__) -/* NOTE: this is deprecated in favor of pr_notice_once(). */ +/* NOTE: this is deprecated in favor of drm_notice_once(NULL, ...). */ #define DRM_NOTE_ONCE(fmt, ...) \ _DRM_PRINTK(_once, NOTICE, fmt, ##__VA_ARGS__) -/* NOTE: this is deprecated in favor of pr_warn_once(). */ +/* NOTE: this is deprecated in favor of drm_warn_once(NULL, ...). */ #define DRM_WARN_ONCE(fmt, ...) \ _DRM_PRINTK(_once, WARNING, fmt, ##__VA_ARGS__) -/* NOTE: this is deprecated in favor of pr_err(). */ +/* NOTE: this is deprecated in favor of drm_err(NULL, ...). */ #define DRM_ERROR(fmt, ...) \ __drm_err(fmt, ##__VA_ARGS__) -/* NOTE: this is deprecated in favor of pr_err_ratelimited(). */ +/* NOTE: this is deprecated in favor of drm_err_ratelimited(NULL, ...). */ #define DRM_ERROR_RATELIMITED(fmt, ...) \ DRM_DEV_ERROR_RATELIMITED(NULL, fmt, ##__VA_ARGS__) @@ -593,13 +637,14 @@ void __drm_err(const char *format, ...); #define DRM_DEBUG_DP(fmt, ...) \ __drm_dbg(DRM_UT_DP, fmt, ## __VA_ARGS__) -#define __DRM_DEFINE_DBG_RATELIMITED(category, drm, fmt, ...) \ -({ \ - static DEFINE_RATELIMIT_STATE(rs_, DEFAULT_RATELIMIT_INTERVAL, DEFAULT_RATELIMIT_BURST);\ - const struct drm_device *drm_ = (drm); \ - \ - if (drm_debug_enabled(DRM_UT_ ## category) && __ratelimit(&rs_)) \ - drm_dev_printk(drm_ ? drm_->dev : NULL, KERN_DEBUG, fmt, ## __VA_ARGS__); \ +#define __DRM_DEFINE_DBG_RATELIMITED(category, drm, fmt, ...) \ +({ \ + static DEFINE_RATELIMIT_STATE(rs_, DEFAULT_RATELIMIT_INTERVAL, \ + DEFAULT_RATELIMIT_BURST); \ + \ + if (drm_debug_enabled(DRM_UT_ ## category) && __ratelimit(&rs_))\ + drm_dev_printk(__drm_get_dev_ptr(drm), KERN_DEBUG, \ + fmt, ## __VA_ARGS__); \ }) #define drm_dbg_kms_ratelimited(drm, fmt, ...) \ -- 2.39.0