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[86.3.57.50]) by smtp.gmail.com with ESMTPSA id ef10sm32728270wjd.22.2016.12.07.10.35.35 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Wed, 07 Dec 2016 10:35:35 -0800 (PST) From: Robert Bragg To: intel-gfx@lists.freedesktop.org Subject: [RFC v2] drm: Enable dynamic debug for DRM_[DEV]_DEBUG* Date: Wed, 7 Dec 2016 18:35:29 +0000 Message-Id: <20161207183529.11256-1-robert@sixbynine.org> X-Mailer: git-send-email 2.10.2 Cc: Daniel Vetter , Tvrtko Ursulin , dri-devel@lists.freedesktop.org, Robert Bragg X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" X-Virus-Scanned: ClamAV using ClamSMTP This is still missing corresponding documentation changes, and I haven't moved anything to drm_print.h yet, as suggested. Sending out with a few functional improvements first to get agreement before documenting anything (changes summarised in v2: section below) In particular, affecting the output format, I stole an idea from Tvrtko Ursulin to have the prefix for messages be based on the driver name, such as "[i915]" instead of always being "[drm]". Depending on peoples thoughts on compatibility, we could consider removing the prefix given that the dynamic debug control interface has a way of specifying that messages should include a module name, function or line info like: echo "module i915 +mfp" > dynamic_debug/control That would enable all i915 debug messages with a module and function prefix. A trade-off would be that anyone only using the drm.drm_debug interface to control messages would loose some information. If we really wanted we could have the best of both by adding a utility printing api that can recognise when printing due to a dynamic debug control query vs drm.drm_debug to conditionally add the prefix. --- >8 --- (git am --scissors) Dynamic debug messages (ref: Documentation/dynamic-debug-howto.txt) allow fine grained control over which debug messages are enabled with runtime control through /sysfs/kernel/debug/dynamic_debug/control This provides more control than the current drm.drm_debug parameter which for some use cases is impractical to use given how chatty some drm debug categories are. For example all debug messages in i915_drm.c can be enabled with: echo "file i915_perf.c +p" > dynamic_debug/control This doesn't strictly maintain format compatibility with the previous debug messages since the category is now added as part of the prefix like "[drm][kms] No FB found". Adding the categories with a consistent format makes it possible to enable categories with a dynamic debug query like: echo "format [kms] +p" > dynamic_debug/control This maintains support for enabling debug messages using the drm_debug parameter. If dynamic debug is not enabled via CONFIG_DYNAMIC_DEBUG the debug messages essentially work as before, except with the inclusion of categories in the format strings as described above. This removes the drm_[dev_]printk wrappers considering that the dynamic debug macros are only useful if they can track the __FILE__, __func__ and __LINE__ where they are called. The wrapper didn't seem necessary in the DRM_UT_NONE case with no category flag. The non _DEV macros are no longer defined in terms of passing NULL to a _DEV variant to avoid have the core.c dev_printk implementation adding "(NULL device *)". The previous drm_[dev_]prink function used to handle this as a special case. Instead of using DRM_NAME to add [drm] to the start of every message, the prefix is now based on module_name(THIS_MODULE) so it will be [drm] or e.g. [i915] for the Intel driver. Later we might consider removing the prefix altogether considering that the dynamic debug control interface has a way of optionally adding the module, function or line to the formatting of messages. v2: Add categories to format like "[drm][kms] No FB found" Only single conditional call per message (macros expand to less code) Uses __dynamic_pr_debug/dev_dbg for dynamic formatting features Use module name for msg prefix like [drm] or [i915] Signed-off-by: Robert Bragg Cc: dri-devel@lists.freedesktop.org Cc: Daniel Vetter Cc: Tvrtko Ursulin --- drivers/gpu/drm/drm_drv.c | 47 ----------- include/drm/drmP.h | 202 +++++++++++++++++++++++++++++----------------- 2 files changed, 127 insertions(+), 122 deletions(-) diff --git a/drivers/gpu/drm/drm_drv.c b/drivers/gpu/drm/drm_drv.c index f74b7d0..25d00aa 100644 --- a/drivers/gpu/drm/drm_drv.c +++ b/drivers/gpu/drm/drm_drv.c @@ -65,53 +65,6 @@ static struct idr drm_minors_idr; static struct dentry *drm_debugfs_root; -#define DRM_PRINTK_FMT "[" DRM_NAME ":%s]%s %pV" - -void drm_dev_printk(const struct device *dev, const char *level, - unsigned int category, const char *function_name, - const char *prefix, const char *format, ...) -{ - struct va_format vaf; - va_list args; - - if (category != DRM_UT_NONE && !(drm_debug & category)) - return; - - va_start(args, format); - vaf.fmt = format; - vaf.va = &args; - - if (dev) - dev_printk(level, dev, DRM_PRINTK_FMT, function_name, prefix, - &vaf); - else - printk("%s" DRM_PRINTK_FMT, level, function_name, prefix, &vaf); - - va_end(args); -} -EXPORT_SYMBOL(drm_dev_printk); - -void drm_printk(const char *level, unsigned int category, - const char *format, ...) -{ - struct va_format vaf; - va_list args; - - if (category != DRM_UT_NONE && !(drm_debug & category)) - return; - - va_start(args, format); - vaf.fmt = format; - vaf.va = &args; - - printk("%s" "[" DRM_NAME ":%ps]%s %pV", - level, __builtin_return_address(0), - strcmp(level, KERN_ERR) == 0 ? " *ERROR*" : "", &vaf); - - va_end(args); -} -EXPORT_SYMBOL(drm_printk); - /* * DRM Minors * A DRM device can provide several char-dev interfaces on the DRM-Major. Each diff --git a/include/drm/drmP.h b/include/drm/drmP.h index a9cfd33..0416114 100644 --- a/include/drm/drmP.h +++ b/include/drm/drmP.h @@ -58,6 +58,7 @@ #include #include #include +#include #include #include @@ -129,15 +130,22 @@ struct dma_buf_attachment; * run-time by echoing the debug value in its sysfs node: * # echo 0xf > /sys/module/drm/parameters/debug */ -#define DRM_UT_NONE 0x00 #define DRM_UT_CORE 0x01 +#define _DRM_UT_core 0x01 #define DRM_UT_DRIVER 0x02 +#define _DRM_UT_drv 0x02 #define DRM_UT_KMS 0x04 +#define _DRM_UT_kms 0x04 #define DRM_UT_PRIME 0x08 +#define _DRM_UT_prime 0x08 #define DRM_UT_ATOMIC 0x10 +#define _DRM_UT_atomic 0x10 #define DRM_UT_VBL 0x20 +#define _DRM_UT_vbl 0x20 #define DRM_UT_STATE 0x40 +#define _DRM_PREFIX module_name(THIS_MODULE) + /***********************************************************************/ /** \name DRM template customization defaults */ /*@{*/ @@ -146,25 +154,19 @@ struct dma_buf_attachment; /** \name Macros to make printk easier */ /*@{*/ -#define _DRM_PRINTK(once, level, fmt, ...) \ - do { \ - printk##once(KERN_##level "[" DRM_NAME "] " fmt, \ - ##__VA_ARGS__); \ - } while (0) - -#define DRM_INFO(fmt, ...) \ - _DRM_PRINTK(, INFO, fmt, ##__VA_ARGS__) -#define DRM_NOTE(fmt, ...) \ - _DRM_PRINTK(, NOTICE, fmt, ##__VA_ARGS__) -#define DRM_WARN(fmt, ...) \ - _DRM_PRINTK(, WARNING, fmt, ##__VA_ARGS__) - -#define DRM_INFO_ONCE(fmt, ...) \ - _DRM_PRINTK(_once, INFO, fmt, ##__VA_ARGS__) -#define DRM_NOTE_ONCE(fmt, ...) \ - _DRM_PRINTK(_once, NOTICE, fmt, ##__VA_ARGS__) -#define DRM_WARN_ONCE(fmt, ...) \ - _DRM_PRINTK(_once, WARNING, fmt, ##__VA_ARGS__) +#define DRM_INFO(fmt, args...) \ + pr_info("[%s] " fmt, _DRM_PREFIX, ##args) +#define DRM_NOTE(fmt, args...) \ + pr_notice("[%s] " fmt, _DRM_PREFIX, ##args) +#define DRM_WARN(fmt, args...) \ + pr_warn("[%s] " fmt, _DRM_PREFIX, ##args) + +#define DRM_INFO_ONCE(fmt, args...) \ + pr_info_once("[%s] " fmt, _DRM_PREFIX, ##args) +#define DRM_NOTE_ONCE(fmt, args...) \ + pr_notice_once("[%s] " fmt, _DRM_PREFIX, ##args) +#define DRM_WARN_ONCE(fmt, args...) \ + pr_warn_once("[%s] " fmt, _DRM_PREFIX, ##args) /** * Error output. @@ -172,11 +174,10 @@ struct dma_buf_attachment; * \param fmt printf() like format string. * \param arg arguments */ -#define DRM_DEV_ERROR(dev, fmt, ...) \ - drm_dev_printk(dev, KERN_ERR, DRM_UT_NONE, __func__, " *ERROR*",\ - fmt, ##__VA_ARGS__) -#define DRM_ERROR(fmt, ...) \ - drm_printk(KERN_ERR, DRM_UT_NONE, fmt, ##__VA_ARGS__) +#define DRM_DEV_ERROR(dev, fmt, args...) \ + dev_err(dev, "[%s:%s]*ERROR*" fmt, _DRM_PREFIX, __func__, ##args) +#define DRM_ERROR(fmt, args...) \ + pr_err("[%s:%s]*ERROR*" fmt, _DRM_PREFIX, __func__, ##args) /** * Rate limited error output. Like DRM_ERROR() but won't flood the log. @@ -184,81 +185,129 @@ struct dma_buf_attachment; * \param fmt printf() like format string. * \param arg arguments */ -#define DRM_DEV_ERROR_RATELIMITED(dev, fmt, ...) \ +#define DRM_DEV_ERROR_RATELIMITED(dev, fmt, args...) \ ({ \ static DEFINE_RATELIMIT_STATE(_rs, \ DEFAULT_RATELIMIT_INTERVAL, \ DEFAULT_RATELIMIT_BURST); \ \ if (__ratelimit(&_rs)) \ - DRM_DEV_ERROR(dev, fmt, ##__VA_ARGS__); \ + DRM_DEV_ERROR(dev, fmt, ##args); \ }) -#define DRM_ERROR_RATELIMITED(fmt, ...) \ - DRM_DEV_ERROR_RATELIMITED(NULL, fmt, ##__VA_ARGS__) - -#define DRM_DEV_INFO(dev, fmt, ...) \ - drm_dev_printk(dev, KERN_INFO, DRM_UT_NONE, __func__, "", fmt, \ - ##__VA_ARGS__) - -#define DRM_DEV_INFO_ONCE(dev, fmt, ...) \ +#define DRM_ERROR_RATELIMITED(fmt, args...) \ ({ \ - static bool __print_once __read_mostly; \ - if (!__print_once) { \ - __print_once = true; \ - DRM_DEV_INFO(dev, fmt, ##__VA_ARGS__); \ - } \ + static DEFINE_RATELIMIT_STATE(_rs, \ + DEFAULT_RATELIMIT_INTERVAL, \ + DEFAULT_RATELIMIT_BURST); \ + \ + if (__ratelimit(&_rs)) \ + DRM_ERROR(fmt, ##args); \ }) +#define DRM_DEV_INFO(dev, fmt, args...) \ + dev_info(dev, "[%s:%s] " fmt, _DRM_PREFIX, __func__, ##args) + +#define DRM_DEV_INFO_ONCE(dev, fmt, args...) \ + dev_info_once(dev, "[%s:%s] " fmt, _DRM_PREFIX, __func__, ##args) + /** * Debug output. * * \param fmt printf() like format string. * \param arg arguments */ + +#if defined(CONFIG_DYNAMIC_DEBUG) +#define DRM_DEF_DYN_DEBUG_DATA(name, fmt) \ + DEFINE_DYNAMIC_DEBUG_METADATA(name, fmt); +#define DRM_DYN_DEBUG_BRANCH(descriptor) \ + DYNAMIC_DEBUG_BRANCH(descriptor) + +#define __drm_dyn_dev_dbg(descriptor, dev, fmt, args...) \ + __dynamic_dev_dbg(descriptor, dev, fmt, ##args) +#define __drm_dyn_pr_debug(descriptor, fmt, args...) \ + __dynamic_pr_debug(descriptor, fmt, ##args) +#else +#define DRM_DEF_DYN_DEBUG_DATA(name, fmt) do {} while(0) +#define DRM_DYN_DEBUG_BRANCH(descriptor) 0 + +#define __drm_dyn_dev_dbg(descriptor, dev, fmt, args...) \ + dev_dbg(dev, fmt, ##args) +#define __drm_dyn_pr_debug(descriptor, fmt, args...) \ + pr_debug(fmt, ##args) +#endif + +/* If modifying, note the duplication of the format strings for the + * dynamic debug meta data and for passing to printk. We don't + * deref descriptor->format to handle building without + * CONFIG_DYNAMIC_DEBUG + */ +#define _DRM_DEV_DEBUG(dev, cat, fmt, args...) \ +({ \ + DRM_DEF_DYN_DEBUG_DATA(descriptor, "[%s:%s]["#cat"] " fmt); \ + if (DRM_DYN_DEBUG_BRANCH(descriptor) || \ + unlikely(drm_debug & _DRM_UT_##cat)) { \ + __drm_dyn_dev_dbg(&descriptor, dev, \ + "[%s:%s]["#cat"] " fmt, \ + _DRM_PREFIX, __func__, ##args); \ + } \ +}) +#define _DRM_DEBUG(cat, fmt, args...) \ +({ \ + DRM_DEF_DYN_DEBUG_DATA(descriptor, "[%s:%s]["#cat"] " fmt); \ + if (DRM_DYN_DEBUG_BRANCH(descriptor) || \ + unlikely(drm_debug & _DRM_UT_##cat)) { \ + __drm_dyn_pr_debug(&descriptor, \ + "[%s:%s]["#cat"] " fmt, \ + _DRM_PREFIX, __func__, ##args); \ + } \ +}) + #define DRM_DEV_DEBUG(dev, fmt, args...) \ - drm_dev_printk(dev, KERN_DEBUG, DRM_UT_CORE, __func__, "", fmt, \ - ##args) -#define DRM_DEBUG(fmt, ...) \ - drm_printk(KERN_DEBUG, DRM_UT_CORE, fmt, ##__VA_ARGS__) + _DRM_DEV_DEBUG(dev, core, fmt, ##args) +#define DRM_DEBUG(fmt, args...) \ + _DRM_DEBUG(core, fmt, ##args) #define DRM_DEV_DEBUG_DRIVER(dev, fmt, args...) \ - drm_dev_printk(dev, KERN_DEBUG, DRM_UT_DRIVER, __func__, "", \ - fmt, ##args) -#define DRM_DEBUG_DRIVER(fmt, ...) \ - drm_printk(KERN_DEBUG, DRM_UT_DRIVER, fmt, ##__VA_ARGS__) + _DRM_DEV_DEBUG(dev, drv, fmt, ##args) +#define DRM_DEBUG_DRIVER(fmt, args...) \ + _DRM_DEBUG(drv, fmt, ##args) #define DRM_DEV_DEBUG_KMS(dev, fmt, args...) \ - drm_dev_printk(dev, KERN_DEBUG, DRM_UT_KMS, __func__, "", fmt, \ - ##args) -#define DRM_DEBUG_KMS(fmt, ...) \ - drm_printk(KERN_DEBUG, DRM_UT_KMS, fmt, ##__VA_ARGS__) + _DRM_DEV_DEBUG(dev, kms, fmt, ##args) +#define DRM_DEBUG_KMS(fmt, args...) \ + _DRM_DEBUG(kms, fmt, ##args) #define DRM_DEV_DEBUG_PRIME(dev, fmt, args...) \ - drm_dev_printk(dev, KERN_DEBUG, DRM_UT_PRIME, __func__, "", \ - fmt, ##args) -#define DRM_DEBUG_PRIME(fmt, ...) \ - drm_printk(KERN_DEBUG, DRM_UT_PRIME, fmt, ##__VA_ARGS__) + _DRM_DEV_DEBUG(dev, prime, fmt, ##args) +#define DRM_DEBUG_PRIME(fmt, args...) \ + _DRM_DEBUG(prime, fmt, ##args) #define DRM_DEV_DEBUG_ATOMIC(dev, fmt, args...) \ - drm_dev_printk(dev, KERN_DEBUG, DRM_UT_ATOMIC, __func__, "", \ - fmt, ##args) -#define DRM_DEBUG_ATOMIC(fmt, ...) \ - drm_printk(KERN_DEBUG, DRM_UT_ATOMIC, fmt, ##__VA_ARGS__) + _DRM_DEV_DEBUG(dev, atomic, fmt, ##args) +#define DRM_DEBUG_ATOMIC(fmt, args...) \ + _DRM_DEBUG(atomic, fmt, ##args) #define DRM_DEV_DEBUG_VBL(dev, fmt, args...) \ - drm_dev_printk(dev, KERN_DEBUG, DRM_UT_VBL, __func__, "", fmt, \ - ##args) -#define DRM_DEBUG_VBL(fmt, ...) \ - drm_printk(KERN_DEBUG, DRM_UT_VBL, fmt, ##__VA_ARGS__) + _DRM_DEV_DEBUG(dev, vbl, fmt, ##args) +#define DRM_DEBUG_VBL(fmt, args...) \ + _DRM_DEBUG(vbl, fmt, ##args) -#define _DRM_DEV_DEFINE_DEBUG_RATELIMITED(dev, level, fmt, args...) \ +#define _DRM_DEV_DEFINE_DEBUG_RATELIMITED(dev, category, fmt, args...) \ ({ \ static DEFINE_RATELIMIT_STATE(_rs, \ DEFAULT_RATELIMIT_INTERVAL, \ DEFAULT_RATELIMIT_BURST); \ if (__ratelimit(&_rs)) \ - drm_dev_printk(dev, KERN_DEBUG, DRM_UT_ ## level, \ - __func__, "", fmt, ##args); \ + _DRM_DEV_DEBUG(dev, category, fmt, ##args); \ +}) +#define _DRM_DEFINE_DEBUG_RATELIMITED(category, fmt, args...) \ +({ \ + static DEFINE_RATELIMIT_STATE(_rs, \ + DEFAULT_RATELIMIT_INTERVAL, \ + DEFAULT_RATELIMIT_BURST); \ + if (__ratelimit(&_rs)) \ + _DRM_DEBUG(category, fmt, ##args); \ }) /** @@ -268,21 +317,24 @@ struct dma_buf_attachment; * \param arg arguments */ #define DRM_DEV_DEBUG_RATELIMITED(dev, fmt, args...) \ - DEV__DRM_DEFINE_DEBUG_RATELIMITED(dev, CORE, fmt, ##args) + _DRM_DEFINE_DEBUG_RATELIMITED(dev, core, fmt, ##args) #define DRM_DEBUG_RATELIMITED(fmt, args...) \ - DRM_DEV_DEBUG_RATELIMITED(NULL, fmt, ##args) + _DRM_DEFINE_DEBUG_RATELIMITED(core, fmt, ##args) + #define DRM_DEV_DEBUG_DRIVER_RATELIMITED(dev, fmt, args...) \ - _DRM_DEV_DEFINE_DEBUG_RATELIMITED(dev, DRIVER, fmt, ##args) + _DRM_DEV_DEFINE_DEBUG_RATELIMITED(dev, drv, fmt, ##args) #define DRM_DEBUG_DRIVER_RATELIMITED(fmt, args...) \ - DRM_DEV_DEBUG_DRIVER_RATELIMITED(NULL, fmt, ##args) + _DRM_DEV_DEFINE_DEBUG_RATELIMITED(drv, fmt, ##args) + #define DRM_DEV_DEBUG_KMS_RATELIMITED(dev, fmt, args...) \ - _DRM_DEV_DEFINE_DEBUG_RATELIMITED(dev, KMS, fmt, ##args) + _DRM_DEV_DEFINE_DEBUG_RATELIMITED(dev, kms, fmt, ##args) #define DRM_DEBUG_KMS_RATELIMITED(fmt, args...) \ - DRM_DEV_DEBUG_KMS_RATELIMITED(NULL, fmt, ##args) + _DRM_DEFINE_DEBUG_RATELIMITED(kms, fmt, ##args) + #define DRM_DEV_DEBUG_PRIME_RATELIMITED(dev, fmt, args...) \ - _DRM_DEV_DEFINE_DEBUG_RATELIMITED(dev, PRIME, fmt, ##args) + _DRM_DEV_DEFINE_DEBUG_RATELIMITED(dev, prime, fmt, ##args) #define DRM_DEBUG_PRIME_RATELIMITED(fmt, args...) \ - DRM_DEV_DEBUG_PRIME_RATELIMITED(NULL, fmt, ##args) + _DRM_DEFINE_DEBUG_RATELIMITED(prime, fmt, ##args) /* Format strings and argument splitters to simplify printing * various "complex" objects