| Message ID | 20230809192514.158062-2-jfalempe@redhat.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | drm/panic: Add a drm panic handler | expand |
Hi Jocelyn, kernel test robot noticed the following build warnings: [auto build test WARNING on 6995e2de6891c724bfeb2db33d7b87775f913ad1] url: https://github.com/intel-lab-lkp/linux/commits/Jocelyn-Falempe/drm-panic-Add-a-drm-panic-handler/20230810-032733 base: 6995e2de6891c724bfeb2db33d7b87775f913ad1 patch link: https://lore.kernel.org/r/20230809192514.158062-2-jfalempe%40redhat.com patch subject: [PATCH 1/2] drm/panic: Add a drm panic handler config: nios2-randconfig-r011-20230809 (https://download.01.org/0day-ci/archive/20230810/202308101307.hbEyAamN-lkp@intel.com/config) compiler: nios2-linux-gcc (GCC) 12.3.0 reproduce: (https://download.01.org/0day-ci/archive/20230810/202308101307.hbEyAamN-lkp@intel.com/reproduce) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot <lkp@intel.com> | Closes: https://lore.kernel.org/oe-kbuild-all/202308101307.hbEyAamN-lkp@intel.com/ All warnings (new ones prefixed by >>): >> drivers/gpu/drm/drm_panic.c:246:6: warning: no previous prototype for 'drm_panic_init_client' [-Wmissing-prototypes] 246 | void drm_panic_init_client(struct drm_device *dev) | ^~~~~~~~~~~~~~~~~~~~~ >> drivers/gpu/drm/drm_panic.c:272:6: warning: no previous prototype for 'drm_panic_init' [-Wmissing-prototypes] 272 | void drm_panic_init(void) | ^~~~~~~~~~~~~~ >> drivers/gpu/drm/drm_panic.c:282:6: warning: no previous prototype for 'drm_panic_exit' [-Wmissing-prototypes] 282 | void drm_panic_exit(void) | ^~~~~~~~~~~~~~ -- >> drivers/gpu/drm/drm_panic.c:28: warning: This comment starts with '/**', but isn't a kernel-doc comment. Refer Documentation/doc-guide/kernel-doc.rst * This module displays a user friendly message on screen when a kernel panic drivers/gpu/drm/drm_panic.c:36: warning: This comment starts with '/**', but isn't a kernel-doc comment. Refer Documentation/doc-guide/kernel-doc.rst * List of drm clients >> drivers/gpu/drm/drm_panic.c:283: warning: expecting prototype for drm_log_exit(). Prototype was for drm_panic_exit() instead vim +/drm_panic_init_client +246 drivers/gpu/drm/drm_panic.c 245 > 246 void drm_panic_init_client(struct drm_device *dev) 247 { 248 struct dpanic_drm_client *new; 249 int ret; 250 251 new = kzalloc(sizeof(*new), GFP_KERNEL); 252 if (!new) 253 return; 254 255 ret = drm_client_init(dev, &new->client, "drm_panic", NULL); 256 if (ret < 0) { 257 kfree(new); 258 return; 259 } 260 drm_client_register(&new->client); 261 list_add_tail(&new->head, &dpanic_clients); 262 263 drm_info(dev, "Registered with drm panic\n"); 264 } 265 EXPORT_SYMBOL(drm_panic_init_client); 266 267 /** 268 * drm_panic_init() - Initialize drm-panic subsystem 269 * 270 * register the panic notifier 271 */ > 272 void drm_panic_init(void) 273 { 274 /* register panic handler */ 275 atomic_notifier_chain_register(&panic_notifier_list, 276 &drm_panic_notifier); 277 } 278 279 /** 280 * drm_log_exit() - Shutdown drm-panic subsystem 281 */ > 282 void drm_panic_exit(void) > 283 {
Hi Jocelyn,
kernel test robot noticed the following build warnings:
[auto build test WARNING on 6995e2de6891c724bfeb2db33d7b87775f913ad1]
url: https://github.com/intel-lab-lkp/linux/commits/Jocelyn-Falempe/drm-panic-Add-a-drm-panic-handler/20230810-032733
base: 6995e2de6891c724bfeb2db33d7b87775f913ad1
patch link: https://lore.kernel.org/r/20230809192514.158062-2-jfalempe%40redhat.com
patch subject: [PATCH 1/2] drm/panic: Add a drm panic handler
config: s390-randconfig-r044-20230809 (https://download.01.org/0day-ci/archive/20230810/202308101423.GSvLgbbe-lkp@intel.com/config)
compiler: clang version 17.0.0 (https://github.com/llvm/llvm-project.git 4a5ac14ee968ff0ad5d2cc1ffa0299048db4c88a)
reproduce: (https://download.01.org/0day-ci/archive/20230810/202308101423.GSvLgbbe-lkp@intel.com/reproduce)
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202308101423.GSvLgbbe-lkp@intel.com/
All warnings (new ones prefixed by >>):
In file included from drivers/gpu/drm/drm_panic.c:9:
In file included from include/linux/iosys-map.h:10:
In file included from include/linux/io.h:13:
In file included from arch/s390/include/asm/io.h:75:
include/asm-generic/io.h:547:31: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
547 | val = __raw_readb(PCI_IOBASE + addr);
| ~~~~~~~~~~ ^
include/asm-generic/io.h:560:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
560 | val = __le16_to_cpu((__le16 __force)__raw_readw(PCI_IOBASE + addr));
| ~~~~~~~~~~ ^
include/uapi/linux/byteorder/big_endian.h:37:59: note: expanded from macro '__le16_to_cpu'
37 | #define __le16_to_cpu(x) __swab16((__force __u16)(__le16)(x))
| ^
include/uapi/linux/swab.h:102:54: note: expanded from macro '__swab16'
102 | #define __swab16(x) (__u16)__builtin_bswap16((__u16)(x))
| ^
In file included from drivers/gpu/drm/drm_panic.c:9:
In file included from include/linux/iosys-map.h:10:
In file included from include/linux/io.h:13:
In file included from arch/s390/include/asm/io.h:75:
include/asm-generic/io.h:573:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
573 | val = __le32_to_cpu((__le32 __force)__raw_readl(PCI_IOBASE + addr));
| ~~~~~~~~~~ ^
include/uapi/linux/byteorder/big_endian.h:35:59: note: expanded from macro '__le32_to_cpu'
35 | #define __le32_to_cpu(x) __swab32((__force __u32)(__le32)(x))
| ^
include/uapi/linux/swab.h:115:54: note: expanded from macro '__swab32'
115 | #define __swab32(x) (__u32)__builtin_bswap32((__u32)(x))
| ^
In file included from drivers/gpu/drm/drm_panic.c:9:
In file included from include/linux/iosys-map.h:10:
In file included from include/linux/io.h:13:
In file included from arch/s390/include/asm/io.h:75:
include/asm-generic/io.h:584:33: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
584 | __raw_writeb(value, PCI_IOBASE + addr);
| ~~~~~~~~~~ ^
include/asm-generic/io.h:594:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
594 | __raw_writew((u16 __force)cpu_to_le16(value), PCI_IOBASE + addr);
| ~~~~~~~~~~ ^
include/asm-generic/io.h:604:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
604 | __raw_writel((u32 __force)cpu_to_le32(value), PCI_IOBASE + addr);
| ~~~~~~~~~~ ^
include/asm-generic/io.h:692:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
692 | readsb(PCI_IOBASE + addr, buffer, count);
| ~~~~~~~~~~ ^
include/asm-generic/io.h:700:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
700 | readsw(PCI_IOBASE + addr, buffer, count);
| ~~~~~~~~~~ ^
include/asm-generic/io.h:708:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
708 | readsl(PCI_IOBASE + addr, buffer, count);
| ~~~~~~~~~~ ^
include/asm-generic/io.h:717:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
717 | writesb(PCI_IOBASE + addr, buffer, count);
| ~~~~~~~~~~ ^
include/asm-generic/io.h:726:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
726 | writesw(PCI_IOBASE + addr, buffer, count);
| ~~~~~~~~~~ ^
include/asm-generic/io.h:735:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
735 | writesl(PCI_IOBASE + addr, buffer, count);
| ~~~~~~~~~~ ^
>> drivers/gpu/drm/drm_panic.c:246:6: warning: no previous prototype for function 'drm_panic_init_client' [-Wmissing-prototypes]
246 | void drm_panic_init_client(struct drm_device *dev)
| ^
drivers/gpu/drm/drm_panic.c:246:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
246 | void drm_panic_init_client(struct drm_device *dev)
| ^
| static
>> drivers/gpu/drm/drm_panic.c:272:6: warning: no previous prototype for function 'drm_panic_init' [-Wmissing-prototypes]
272 | void drm_panic_init(void)
| ^
drivers/gpu/drm/drm_panic.c:272:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
272 | void drm_panic_init(void)
| ^
| static
>> drivers/gpu/drm/drm_panic.c:282:6: warning: no previous prototype for function 'drm_panic_exit' [-Wmissing-prototypes]
282 | void drm_panic_exit(void)
| ^
drivers/gpu/drm/drm_panic.c:282:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
282 | void drm_panic_exit(void)
| ^
| static
15 warnings generated.
--
>> drivers/gpu/drm/drm_panic.c:28: warning: This comment starts with '/**', but isn't a kernel-doc comment. Refer Documentation/doc-guide/kernel-doc.rst
* This module displays a user friendly message on screen when a kernel panic
drivers/gpu/drm/drm_panic.c:36: warning: This comment starts with '/**', but isn't a kernel-doc comment. Refer Documentation/doc-guide/kernel-doc.rst
* List of drm clients
>> drivers/gpu/drm/drm_panic.c:283: warning: expecting prototype for drm_log_exit(). Prototype was for drm_panic_exit() instead
vim +/drm_panic_init_client +246 drivers/gpu/drm/drm_panic.c
245
> 246 void drm_panic_init_client(struct drm_device *dev)
247 {
248 struct dpanic_drm_client *new;
249 int ret;
250
251 new = kzalloc(sizeof(*new), GFP_KERNEL);
252 if (!new)
253 return;
254
255 ret = drm_client_init(dev, &new->client, "drm_panic", NULL);
256 if (ret < 0) {
257 kfree(new);
258 return;
259 }
260 drm_client_register(&new->client);
261 list_add_tail(&new->head, &dpanic_clients);
262
263 drm_info(dev, "Registered with drm panic\n");
264 }
265 EXPORT_SYMBOL(drm_panic_init_client);
266
267 /**
268 * drm_panic_init() - Initialize drm-panic subsystem
269 *
270 * register the panic notifier
271 */
> 272 void drm_panic_init(void)
273 {
274 /* register panic handler */
275 atomic_notifier_chain_register(&panic_notifier_list,
276 &drm_panic_notifier);
277 }
278
279 /**
280 * drm_log_exit() - Shutdown drm-panic subsystem
281 */
> 282 void drm_panic_exit(void)
> 283 {
diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig index ba3fb04bb691..cc6771351d6d 100644 --- a/drivers/gpu/drm/Kconfig +++ b/drivers/gpu/drm/Kconfig @@ -98,6 +98,17 @@ config DRM_KMS_HELPER help CRTC helpers for KMS drivers. +config DRM_PANIC + bool "Display a user-friendly message when a kernel panic occurs" + depends on DRM && !FRAMEBUFFER_CONSOLE + select FONT_SUPPORT + default y if DRM_SIMPLEDRM + help + Enable a drm panic handler, which will display a user-friendly message + when a kernel panic occurs. It's useful when using a user-space + console instead of fbcon. + It will only work if your graphic driver supports this feature. + config DRM_DEBUG_DP_MST_TOPOLOGY_REFS bool "Enable refcount backtrace history in the DP MST helpers" depends on STACKTRACE_SUPPORT diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile index a33257d2bc7f..c73dbac9c01e 100644 --- a/drivers/gpu/drm/Makefile +++ b/drivers/gpu/drm/Makefile @@ -72,6 +72,7 @@ drm-$(CONFIG_DRM_PRIVACY_SCREEN) += \ drm_privacy_screen_x86.o drm-$(CONFIG_DRM_ACCEL) += ../../accel/drm_accel.o obj-$(CONFIG_DRM) += drm.o +drm-$(CONFIG_DRM_PANIC) += drm_panic.o obj-$(CONFIG_DRM_PANEL_ORIENTATION_QUIRKS) += drm_panel_orientation_quirks.o diff --git a/drivers/gpu/drm/drm_drv.c b/drivers/gpu/drm/drm_drv.c index cee0cc522ed9..0f2d96edd86d 100644 --- a/drivers/gpu/drm/drm_drv.c +++ b/drivers/gpu/drm/drm_drv.c @@ -45,6 +45,7 @@ #include <drm/drm_mode_object.h> #include <drm/drm_print.h> #include <drm/drm_privacy_screen_machine.h> +#include <drm/drm_panic.h> #include "drm_crtc_internal.h" #include "drm_internal.h" @@ -1065,6 +1066,7 @@ static void drm_core_exit(void) unregister_chrdev(DRM_MAJOR, "drm"); debugfs_remove(drm_debugfs_root); drm_sysfs_destroy(); + drm_panic_exit(); idr_destroy(&drm_minors_idr); drm_connector_ida_destroy(); } @@ -1076,6 +1078,7 @@ static int __init drm_core_init(void) drm_connector_ida_init(); idr_init(&drm_minors_idr); drm_memcpy_init_early(); + drm_panic_init(); ret = drm_sysfs_init(); if (ret < 0) { diff --git a/drivers/gpu/drm/drm_panic.c b/drivers/gpu/drm/drm_panic.c new file mode 100644 index 000000000000..538ca5daaebf --- /dev/null +++ b/drivers/gpu/drm/drm_panic.c @@ -0,0 +1,286 @@ +// SPDX-License-Identifier: GPL-2.0 or MIT +/* + * Copyright (c) 2023 Jocelyn Falempe <jfalempe@redhat.com> + * inspired by the drm_log driver from David Herrmann <dh.herrmann@gmail.com> + * Tux Ascii art taken from cowsay written by Tony Monroe + */ + +#include <linux/font.h> +#include <linux/iosys-map.h> +#include <linux/kdebug.h> +#include <linux/list.h> +#include <linux/module.h> +#include <linux/mutex.h> +#include <linux/panic_notifier.h> +#include <linux/types.h> +#include <linux/slab.h> + +#include <drm/drm_client.h> +#include <drm/drm_fourcc.h> +#include <drm/drm_framebuffer.h> +#include <drm/drm_print.h> + +MODULE_AUTHOR("Jocelyn Falempe"); +MODULE_DESCRIPTION("DRM PANIC"); +MODULE_LICENSE("GPL"); + +/** + * This module displays a user friendly message on screen when a kernel panic + * occurs. + * It will display only one frame, so just clear it, and draw white pixels for + * the characters. Performance optimizations are low priority as the machine is + * already in an unusable state. + */ + +/** + * List of drm clients + */ +struct dpanic_drm_client { + struct list_head head; + struct drm_client_dev client; +}; + +struct dpanic_line { + u32 len; + const char *txt; +}; + +#define PANIC_LINE(s) {.len = sizeof(s), .txt = s} + +const struct dpanic_line panic_msg[] = { + PANIC_LINE("KERNEL PANIC !"), + PANIC_LINE(""), + PANIC_LINE("Please reboot your computer.") +}; + +const struct dpanic_line logo[] = { + PANIC_LINE(" .--."), + PANIC_LINE(" |o_o |"), + PANIC_LINE(" |:_/ |"), + PANIC_LINE(" // \\ \\"), + PANIC_LINE(" (| | )"), + PANIC_LINE(" /'\\_ _/`\\"), + PANIC_LINE(" \\___)=(___/"), +}; + +static LIST_HEAD(dpanic_clients); +static DEFINE_MUTEX(dpanic_lock); + +#define IOSYS_WRITE8(offset, val) iosys_map_wr(screen_base, offset, u8, val) +/* + * Only handle DRM_FORMAT_XRGB8888 for testing + */ +static inline void dpanic_draw_px(struct iosys_map *screen_base, size_t offset, u32 pixel_format, + u8 r, u8 g, u8 b) +{ + switch (pixel_format) { + case DRM_FORMAT_XRGB8888: + IOSYS_WRITE8(offset++, b); + IOSYS_WRITE8(offset++, g); + IOSYS_WRITE8(offset++, r); + IOSYS_WRITE8(offset++, 0xff); + break; + default: + pr_err("Format not supported\n"); + break; + /* TODO other format */ + } +} + +/* Draw a single character at given destination */ +static void dpanic_draw_char(char ch, size_t x, size_t y, + struct drm_framebuffer *fb, + struct iosys_map *map, + const struct font_desc *font) +{ + size_t src_width, src_height, src_stride, i, dst_off; + const u8 *src; + + src_width = font->width; + src_height = font->height; + src_stride = DIV_ROUND_UP(src_width, 8); + + dst_off = x * font->width * fb->format->cpp[0] + y * font->height * fb->pitches[0]; + + src = font->data; + src += ch * src_height * src_stride; + + while (src_height--) { + for (i = 0; i < src_width; ++i) { + /* only draw white pixels */ + if (src[i / 8] & (0x80 >> (i % 8))) + dpanic_draw_px(map, dst_off + i * fb->format->cpp[0], + fb->format->format, 0xff, 0xff, 0xff); + } + src += src_stride; + dst_off += fb->pitches[0]; + } +} + +static void dpanic_draw_line_centered(const struct dpanic_line *line, size_t y, + struct drm_framebuffer *fb, + struct iosys_map *map, + const struct font_desc *font) +{ + size_t chars_per_line = fb->width / font->width; + size_t skip_left, x; + + if (line->len > chars_per_line) + return; + + skip_left = (chars_per_line - line->len) / 2; + + for (x = 0; x < line->len; x++) + dpanic_draw_char(line->txt[x], skip_left + x, y, fb, map, font); +} + +/* + * Draw the Tux logo at the upper left corner + */ +static void dpanic_draw_logo(struct drm_framebuffer *fb, + struct iosys_map *map, + const struct font_desc *font) +{ + size_t chars_per_line = fb->width / font->width; + size_t x, y; + + for (y = 0; y < ARRAY_SIZE(logo); y++) + for (x = 0; x < logo[y].len && x < chars_per_line; x++) + dpanic_draw_char(logo[y].txt[x], x, y, fb, map, font); +} + +/* + * Draw the panic message at the center of the screen + */ +static void dpanic_static_draw(struct drm_client_buffer *buffer) +{ + size_t y, lines, skip_top; + size_t len = ARRAY_SIZE(panic_msg); + struct iosys_map map; + struct drm_framebuffer *fb = buffer->fb; + const struct font_desc *font = get_default_font(fb->width, fb->height, 0x8080, 0x8080); + + if (!font) + return; + + if (drm_client_buffer_vmap(buffer, &map)) { + pr_err("VMAP failed\n"); + return; + } + lines = fb->height / font->height; + skip_top = (lines - len) / 2; + + /* clear screen */ + iosys_map_memset(&map, 0, 0, fb->height * fb->pitches[0]); + + for (y = 0; y < len; y++) + dpanic_draw_line_centered(&panic_msg[y], y + skip_top, fb, &map, font); + + if (skip_top >= ARRAY_SIZE(logo)) + dpanic_draw_logo(fb, &map, font); + + drm_client_framebuffer_flush(buffer, NULL); +} + +#define MAX_MODESET 8 + +static void drm_panic_client(struct drm_client_dev *client) +{ + struct drm_client_buffer *buffer[MAX_MODESET]; + int ret, n_modeset, i; + struct drm_mode_set *mode_set; + + ret = drm_client_modeset_probe(client, 0, 0); + if (ret) + return; + + n_modeset = 0; + drm_client_for_each_modeset(mode_set, client) { + struct drm_plane *primary = mode_set->crtc->primary; + struct drm_framebuffer *fb; + + if (primary->state && primary->state->fb) + fb = primary->state->fb; + else if (primary->fb) + fb = primary->fb; + else + continue; + + pr_debug("DRM Panic, FB width %d, height %d\n", fb->width, fb->height); + buffer[n_modeset] = drm_client_framebuffer_create(client, fb->width, + fb->height, + fb->format->format); + + if (IS_ERR(buffer[n_modeset])) { + pr_err("DRM Panic can't allocate buffer\n"); + continue; + } + mode_set->fb = buffer[n_modeset]->fb; + n_modeset++; + if (n_modeset == MAX_MODESET) + break; + } + ret = drm_client_modeset_commit_locked(client); + if (ret) + return; + + for (i = 0; i < n_modeset; i++) + dpanic_static_draw(buffer[i]); +} + +static int drm_panic(struct notifier_block *this, unsigned long event, + void *ptr) +{ + struct dpanic_drm_client *dpanic_client; + + list_for_each_entry(dpanic_client, &dpanic_clients, head) { + drm_panic_client(&dpanic_client->client); + } + return NOTIFY_OK; +} + +struct notifier_block drm_panic_notifier = { + .notifier_call = drm_panic, +}; + +void drm_panic_init_client(struct drm_device *dev) +{ + struct dpanic_drm_client *new; + int ret; + + new = kzalloc(sizeof(*new), GFP_KERNEL); + if (!new) + return; + + ret = drm_client_init(dev, &new->client, "drm_panic", NULL); + if (ret < 0) { + kfree(new); + return; + } + drm_client_register(&new->client); + list_add_tail(&new->head, &dpanic_clients); + + drm_info(dev, "Registered with drm panic\n"); +} +EXPORT_SYMBOL(drm_panic_init_client); + +/** + * drm_panic_init() - Initialize drm-panic subsystem + * + * register the panic notifier + */ +void drm_panic_init(void) +{ + /* register panic handler */ + atomic_notifier_chain_register(&panic_notifier_list, + &drm_panic_notifier); +} + +/** + * drm_log_exit() - Shutdown drm-panic subsystem + */ +void drm_panic_exit(void) +{ + atomic_notifier_chain_unregister(&panic_notifier_list, + &drm_panic_notifier); +} diff --git a/include/drm/drm_panic.h b/include/drm/drm_panic.h new file mode 100644 index 000000000000..a943b82324e3 --- /dev/null +++ b/include/drm/drm_panic.h @@ -0,0 +1,26 @@ +/* SPDX-License-Identifier: GPL-2.0 or MIT */ +#ifndef __DRM_PANIC_H__ +#define __DRM_PANIC_H__ + +/* + * Copyright (c) 2023 Jocelyn Falempe <jfalempe@redhat.com> + */ + +#include <linux/module.h> +#include <linux/types.h> +#include <linux/iosys-map.h> + +#ifdef CONFIG_DRM_PANIC + +void drm_panic_init(void); +void drm_panic_exit(void); + +void drm_panic_init_client(struct drm_device *dev); +#else + +static inline void drm_panic_init(void) {} +static inline void drm_panic_exit(void) {} +static inline void drm_panic_init_client(struct drm_device *dev) {} +#endif + +#endif /* __DRM_LOG_H__ */
This module displays a user friendly message when a kernel panic occurs. It currently doesn't contain any debug information, but that can be added later. Signed-off-by: Jocelyn Falempe <jfalempe@redhat.com> --- drivers/gpu/drm/Kconfig | 11 ++ drivers/gpu/drm/Makefile | 1 + drivers/gpu/drm/drm_drv.c | 3 + drivers/gpu/drm/drm_panic.c | 286 ++++++++++++++++++++++++++++++++++++ include/drm/drm_panic.h | 26 ++++ 5 files changed, 327 insertions(+) create mode 100644 drivers/gpu/drm/drm_panic.c create mode 100644 include/drm/drm_panic.h