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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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a18b219294
This is something we've needed for a very long time now, as it makes debugging issues with faulty MST hubs along with debugging issues regarding us interfacing with hubs correctly vastly easier to debug. Currently this can actually be done if you trace the i2c devices for DP using ftrace but that's significantly less useful for a couple of reasons: - Tracing the i2c devices through ftrace means all of the traces are going to contain a lot of "garbage" output that we're sending over the i2c line. Most of this garbage comes from retrying transactions, DRM's helper library adding extra transactions to work around bad hubs, etc. - Having a user set up ftrace so that they can provide debugging information is a lot more difficult then being able to say "just boot with drm.debug=0x100" - We can potentially expand upon this tracing in the future to print debugging information in regards to other DP transactions like MST sideband transactions This is inspired by a patch Rob Clark sent to do this a long time back. Neither of us could find the patch however, so we both assumed it would probably just be easier to rewrite it anyway. Cc: Rob Clark <robdclark@gmail.com> Signed-off-by: Lyude Paul <lyude@redhat.com> Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch> Link: https://patchwork.freedesktop.org/patch/msgid/20180716154432.13433-1-lyude@redhat.com
356 lines
10 KiB
C
356 lines
10 KiB
C
/*
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* Copyright (C) 2016 Red Hat
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*
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* Authors:
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* Rob Clark <robdclark@gmail.com>
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*/
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#ifndef DRM_PRINT_H_
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#define DRM_PRINT_H_
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#include <linux/compiler.h>
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#include <linux/printk.h>
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#include <linux/seq_file.h>
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#include <linux/device.h>
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/**
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* DOC: print
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*
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* A simple wrapper for dev_printk(), seq_printf(), etc. Allows same
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* debug code to be used for both debugfs and printk logging.
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*
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* For example::
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*
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* void log_some_info(struct drm_printer *p)
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* {
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* drm_printf(p, "foo=%d\n", foo);
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* drm_printf(p, "bar=%d\n", bar);
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* }
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*
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* #ifdef CONFIG_DEBUG_FS
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* void debugfs_show(struct seq_file *f)
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* {
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* struct drm_printer p = drm_seq_file_printer(f);
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* log_some_info(&p);
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* }
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* #endif
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*
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* void some_other_function(...)
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* {
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* struct drm_printer p = drm_info_printer(drm->dev);
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* log_some_info(&p);
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* }
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*/
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/**
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* struct drm_printer - drm output "stream"
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*
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* Do not use struct members directly. Use drm_printer_seq_file(),
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* drm_printer_info(), etc to initialize. And drm_printf() for output.
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*/
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struct drm_printer {
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/* private: */
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void (*printfn)(struct drm_printer *p, struct va_format *vaf);
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void *arg;
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const char *prefix;
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};
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void __drm_printfn_seq_file(struct drm_printer *p, struct va_format *vaf);
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void __drm_printfn_info(struct drm_printer *p, struct va_format *vaf);
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void __drm_printfn_debug(struct drm_printer *p, struct va_format *vaf);
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__printf(2, 3)
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void drm_printf(struct drm_printer *p, const char *f, ...);
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__printf(2, 0)
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/**
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* drm_vprintf - print to a &drm_printer stream
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* @p: the &drm_printer
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* @fmt: format string
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* @va: the va_list
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*/
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static inline void
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drm_vprintf(struct drm_printer *p, const char *fmt, va_list *va)
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{
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struct va_format vaf = { .fmt = fmt, .va = va };
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p->printfn(p, &vaf);
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}
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/**
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* drm_printf_indent - Print to a &drm_printer stream with indentation
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* @printer: DRM printer
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* @indent: Tab indentation level (max 5)
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* @fmt: Format string
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*/
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#define drm_printf_indent(printer, indent, fmt, ...) \
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drm_printf((printer), "%.*s" fmt, (indent), "\t\t\t\t\tX", ##__VA_ARGS__)
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/**
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* drm_seq_file_printer - construct a &drm_printer that outputs to &seq_file
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* @f: the &struct seq_file to output to
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*
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* RETURNS:
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* The &drm_printer object
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*/
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static inline struct drm_printer drm_seq_file_printer(struct seq_file *f)
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{
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struct drm_printer p = {
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.printfn = __drm_printfn_seq_file,
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.arg = f,
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};
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return p;
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}
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/**
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* drm_info_printer - construct a &drm_printer that outputs to dev_printk()
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* @dev: the &struct device pointer
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*
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* RETURNS:
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* The &drm_printer object
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*/
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static inline struct drm_printer drm_info_printer(struct device *dev)
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{
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struct drm_printer p = {
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.printfn = __drm_printfn_info,
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.arg = dev,
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};
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return p;
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}
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/**
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* drm_debug_printer - construct a &drm_printer that outputs to pr_debug()
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* @prefix: debug output prefix
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*
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* RETURNS:
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* The &drm_printer object
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*/
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static inline struct drm_printer drm_debug_printer(const char *prefix)
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{
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struct drm_printer p = {
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.printfn = __drm_printfn_debug,
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.prefix = prefix
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};
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return p;
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}
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/*
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* The following categories are defined:
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*
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* CORE: Used in the generic drm code: drm_ioctl.c, drm_mm.c, drm_memory.c, ...
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* This is the category used by the DRM_DEBUG() macro.
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*
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* DRIVER: Used in the vendor specific part of the driver: i915, radeon, ...
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* This is the category used by the DRM_DEBUG_DRIVER() macro.
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*
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* KMS: used in the modesetting code.
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* This is the category used by the DRM_DEBUG_KMS() macro.
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*
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* PRIME: used in the prime code.
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* This is the category used by the DRM_DEBUG_PRIME() macro.
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*
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* ATOMIC: used in the atomic code.
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* This is the category used by the DRM_DEBUG_ATOMIC() macro.
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*
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* VBL: used for verbose debug message in the vblank code
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* This is the category used by the DRM_DEBUG_VBL() macro.
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*
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* Enabling verbose debug messages is done through the drm.debug parameter,
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* each category being enabled by a bit.
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*
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* drm.debug=0x1 will enable CORE messages
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* drm.debug=0x2 will enable DRIVER messages
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* drm.debug=0x3 will enable CORE and DRIVER messages
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* ...
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* drm.debug=0x3f will enable all messages
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*
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* An interesting feature is that it's possible to enable verbose logging at
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* run-time by echoing the debug value in its sysfs node:
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* # echo 0xf > /sys/module/drm/parameters/debug
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*/
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#define DRM_UT_NONE 0x00
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#define DRM_UT_CORE 0x01
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#define DRM_UT_DRIVER 0x02
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#define DRM_UT_KMS 0x04
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#define DRM_UT_PRIME 0x08
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#define DRM_UT_ATOMIC 0x10
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#define DRM_UT_VBL 0x20
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#define DRM_UT_STATE 0x40
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#define DRM_UT_LEASE 0x80
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#define DRM_UT_DP 0x100
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__printf(3, 4)
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void drm_dev_printk(const struct device *dev, const char *level,
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const char *format, ...);
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__printf(3, 4)
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void drm_dev_dbg(const struct device *dev, unsigned int category,
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const char *format, ...);
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__printf(2, 3)
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void drm_dbg(unsigned int category, const char *format, ...);
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__printf(1, 2)
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void drm_err(const char *format, ...);
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/* Macros to make printk easier */
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#define _DRM_PRINTK(once, level, fmt, ...) \
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printk##once(KERN_##level "[" DRM_NAME "] " fmt, ##__VA_ARGS__)
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#define DRM_INFO(fmt, ...) \
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_DRM_PRINTK(, INFO, fmt, ##__VA_ARGS__)
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#define DRM_NOTE(fmt, ...) \
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_DRM_PRINTK(, NOTICE, fmt, ##__VA_ARGS__)
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#define DRM_WARN(fmt, ...) \
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_DRM_PRINTK(, WARNING, fmt, ##__VA_ARGS__)
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#define DRM_INFO_ONCE(fmt, ...) \
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_DRM_PRINTK(_once, INFO, fmt, ##__VA_ARGS__)
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#define DRM_NOTE_ONCE(fmt, ...) \
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_DRM_PRINTK(_once, NOTICE, fmt, ##__VA_ARGS__)
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#define DRM_WARN_ONCE(fmt, ...) \
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_DRM_PRINTK(_once, WARNING, fmt, ##__VA_ARGS__)
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/**
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* Error output.
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*
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* @dev: device pointer
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* @fmt: printf() like format string.
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*/
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#define DRM_DEV_ERROR(dev, fmt, ...) \
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drm_dev_printk(dev, KERN_ERR, "*ERROR* " fmt, ##__VA_ARGS__)
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#define DRM_ERROR(fmt, ...) \
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drm_err(fmt, ##__VA_ARGS__)
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/**
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* Rate limited error output. Like DRM_ERROR() but won't flood the log.
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*
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* @dev: device pointer
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* @fmt: printf() like format string.
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*/
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#define DRM_DEV_ERROR_RATELIMITED(dev, fmt, ...) \
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({ \
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static DEFINE_RATELIMIT_STATE(_rs, \
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DEFAULT_RATELIMIT_INTERVAL, \
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DEFAULT_RATELIMIT_BURST); \
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\
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if (__ratelimit(&_rs)) \
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DRM_DEV_ERROR(dev, fmt, ##__VA_ARGS__); \
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})
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#define DRM_ERROR_RATELIMITED(fmt, ...) \
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DRM_DEV_ERROR_RATELIMITED(NULL, fmt, ##__VA_ARGS__)
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#define DRM_DEV_INFO(dev, fmt, ...) \
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drm_dev_printk(dev, KERN_INFO, fmt, ##__VA_ARGS__)
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#define DRM_DEV_INFO_ONCE(dev, fmt, ...) \
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({ \
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static bool __print_once __read_mostly; \
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if (!__print_once) { \
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__print_once = true; \
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DRM_DEV_INFO(dev, fmt, ##__VA_ARGS__); \
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} \
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})
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/**
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* Debug output.
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*
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* @dev: device pointer
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* @fmt: printf() like format string.
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*/
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#define DRM_DEV_DEBUG(dev, fmt, ...) \
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drm_dev_dbg(dev, DRM_UT_CORE, fmt, ##__VA_ARGS__)
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#define DRM_DEBUG(fmt, ...) \
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drm_dbg(DRM_UT_CORE, fmt, ##__VA_ARGS__)
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#define DRM_DEV_DEBUG_DRIVER(dev, fmt, ...) \
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drm_dev_dbg(dev, DRM_UT_DRIVER, fmt, ##__VA_ARGS__)
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#define DRM_DEBUG_DRIVER(fmt, ...) \
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drm_dbg(DRM_UT_DRIVER, fmt, ##__VA_ARGS__)
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#define DRM_DEV_DEBUG_KMS(dev, fmt, ...) \
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drm_dev_dbg(dev, DRM_UT_KMS, fmt, ##__VA_ARGS__)
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#define DRM_DEBUG_KMS(fmt, ...) \
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drm_dbg(DRM_UT_KMS, fmt, ##__VA_ARGS__)
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#define DRM_DEV_DEBUG_PRIME(dev, fmt, ...) \
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drm_dev_dbg(dev, DRM_UT_PRIME, fmt, ##__VA_ARGS__)
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#define DRM_DEBUG_PRIME(fmt, ...) \
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drm_dbg(DRM_UT_PRIME, fmt, ##__VA_ARGS__)
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#define DRM_DEV_DEBUG_ATOMIC(dev, fmt, ...) \
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drm_dev_dbg(dev, DRM_UT_ATOMIC, fmt, ##__VA_ARGS__)
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#define DRM_DEBUG_ATOMIC(fmt, ...) \
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drm_dbg(DRM_UT_ATOMIC, fmt, ##__VA_ARGS__)
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#define DRM_DEV_DEBUG_VBL(dev, fmt, ...) \
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drm_dev_dbg(dev, DRM_UT_VBL, fmt, ##__VA_ARGS__)
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#define DRM_DEBUG_VBL(fmt, ...) \
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drm_dbg(DRM_UT_VBL, fmt, ##__VA_ARGS__)
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#define DRM_DEBUG_LEASE(fmt, ...) \
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drm_dbg(DRM_UT_LEASE, fmt, ##__VA_ARGS__)
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#define DRM_DEV_DEBUG_DP(dev, fmt, ...) \
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drm_dev_dbg(dev, DRM_UT_DP, fmt, ## __VA_ARGS__)
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#define DRM_DEBUG_DP(dev, fmt, ...) \
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drm_dbg(DRM_UT_DP, fmt, ## __VA_ARGS__)
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#define _DRM_DEV_DEFINE_DEBUG_RATELIMITED(dev, category, fmt, ...) \
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({ \
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static DEFINE_RATELIMIT_STATE(_rs, \
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DEFAULT_RATELIMIT_INTERVAL, \
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DEFAULT_RATELIMIT_BURST); \
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if (__ratelimit(&_rs)) \
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drm_dev_dbg(dev, category, fmt, ##__VA_ARGS__); \
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})
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/**
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* Rate limited debug output. Like DRM_DEBUG() but won't flood the log.
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*
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* @dev: device pointer
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* @fmt: printf() like format string.
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*/
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#define DRM_DEV_DEBUG_RATELIMITED(dev, fmt, ...) \
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_DEV_DRM_DEFINE_DEBUG_RATELIMITED(dev, DRM_UT_CORE, \
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fmt, ##__VA_ARGS__)
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#define DRM_DEBUG_RATELIMITED(fmt, ...) \
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DRM_DEV_DEBUG_RATELIMITED(NULL, fmt, ##__VA_ARGS__)
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#define DRM_DEV_DEBUG_DRIVER_RATELIMITED(dev, fmt, ...) \
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_DRM_DEV_DEFINE_DEBUG_RATELIMITED(dev, DRM_UT_DRIVER, \
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fmt, ##__VA_ARGS__)
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#define DRM_DEBUG_DRIVER_RATELIMITED(fmt, ...) \
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DRM_DEV_DEBUG_DRIVER_RATELIMITED(NULL, fmt, ##__VA_ARGS__)
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#define DRM_DEV_DEBUG_KMS_RATELIMITED(dev, fmt, ...) \
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_DRM_DEV_DEFINE_DEBUG_RATELIMITED(dev, DRM_UT_KMS, \
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fmt, ##__VA_ARGS__)
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#define DRM_DEBUG_KMS_RATELIMITED(fmt, ...) \
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DRM_DEV_DEBUG_KMS_RATELIMITED(NULL, fmt, ##__VA_ARGS__)
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#define DRM_DEV_DEBUG_PRIME_RATELIMITED(dev, fmt, ...) \
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_DRM_DEV_DEFINE_DEBUG_RATELIMITED(dev, DRM_UT_PRIME, \
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fmt, ##__VA_ARGS__)
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#define DRM_DEBUG_PRIME_RATELIMITED(fmt, ...) \
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DRM_DEV_DEBUG_PRIME_RATELIMITED(NULL, fmt, ##__VA_ARGS__)
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#endif /* DRM_PRINT_H_ */
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