diff --combined drivers/gpu/drm/drm_panic.c
index 5109bfd5d8891,9fe97c4eda6c8..0000000000000
--- a/drivers/gpu/drm/drm_panic.c
+++ b/drivers/gpu/drm/drm_panic.c
@@@ -7,33 -7,23 +7,23 @@@
*/
#include <linux/export.h>
- #include <linux/font.h>
- #include <linux/highmem.h>
#include <linux/init.h>
- #include <linux/iosys-map.h>
#include <linux/kdebug.h>
#include <linux/kmsg_dump.h>
- #include <linux/linux_logo.h>
#include <linux/list.h>
#include <linux/math.h>
#include <linux/module.h>
#include <linux/overflow.h>
#include <linux/printk.h>
#include <linux/types.h>
- #include <linux/utsname.h>
- #include <linux/zlib.h>
#include <drm/drm_drv.h>
- #include <drm/drm_fourcc.h>
- #include <drm/drm_framebuffer.h>
- #include <drm/drm_modeset_helper_vtables.h>
#include <drm/drm_panic.h>
#include <drm/drm_plane.h>
#include <drm/drm_print.h>
- #include <drm/drm_rect.h>
#include "drm_crtc_internal.h"
- #include "drm_draw_internal.h"
+ #include "drm_panic_internal.h"
MODULE_AUTHOR("Jocelyn Falempe");
MODULE_DESCRIPTION("DRM panic handler");
@@@ -42,789 -32,25 +32,25 @@@ MODULE_LICENSE("GPL")
/**
* DOC: overview
*
- * To enable DRM panic for a driver, the primary plane must implement a
- * &drm_plane_helper_funcs.get_scanout_buffer helper function. It is then
- * automatically registered to the drm panic handler.
- * When a panic occurs, the &drm_plane_helper_funcs.get_scanout_buffer will be
- * called, and the driver can provide a framebuffer so the panic handler can
- * draw the panic screen on it. Currently only linear buffer and a few color
- * formats are supported.
- * Optionally the driver can also provide a
&drm_plane_helper_funcs.panic_flush
- * callback, that will be called after that, to send additional commands to
the
- * hardware to make the scanout buffer visible.
- */
-
- /*
- * This module displays a user friendly message on screen when a kernel panic
- * occurs. This is conflicting with fbcon, so you can only enable it when
fbcon
- * is disabled.
- * It's intended for end-user, so have minimal technical/debug information.
+ * This module displays a user friendly message on screen when a kernel
+ * panic occurs. It's intended for end users and therefore have minimal
+ * technical/debug information.
*
- * Implementation details:
+ * To enable DRM panic for a driver, the at least one primary plane must
+ * implement struct &drm_plane_funcs.display_panic_screen. The plane is
+ * then automatically registered to the drm panic handler.
*
- * It is a panic handler, so it can't take lock, allocate memory, run
tasks/irq,
- * or attempt to sleep. It's a best effort, and it may not be able to display
- * the message in all situations (like if the panic occurs in the middle of a
- * modesetting).
- * It will display only one static frame, so performance optimizations are low
- * priority as the machine is already in an unusable state.
+ * When a panic occurs, the DRM panic handler calls struct
+ * &drm_plane_funcs.display_panic_screen. See
+ * drm_plane_helper_display_panic_screen() for a generic implementation.
*/
- struct drm_panic_line {
- u32 len;
- const char *txt;
- };
-
- #define PANIC_LINE(s) {.len = sizeof(s) - 1, .txt = s}
-
- static struct drm_panic_line panic_msg[] = {
- PANIC_LINE("KERNEL PANIC!"),
- PANIC_LINE(""),
- PANIC_LINE("Please reboot your computer."),
- PANIC_LINE(""),
- PANIC_LINE(""), /* will be replaced by the panic description */
- };
-
- static const size_t panic_msg_lines = ARRAY_SIZE(panic_msg);
-
- static const struct drm_panic_line logo_ascii[] = {
- PANIC_LINE(" .--. _"),
- PANIC_LINE(" |o_o | | |"),
- PANIC_LINE(" |:_/ | | |"),
- PANIC_LINE(" // \\ \\ |_|"),
- PANIC_LINE(" (| | ) _"),
- PANIC_LINE(" /'\\_ _/`\\ (_)"),
- PANIC_LINE(" \\___)=(___/"),
- };
-
- static const size_t logo_ascii_lines = ARRAY_SIZE(logo_ascii);
-
- #if defined(CONFIG_LOGO) && !defined(MODULE)
- static const struct linux_logo *logo_mono;
-
- static int drm_panic_setup_logo(void)
- {
- const struct linux_logo *logo = fb_find_logo(1);
- const unsigned char *logo_data;
- struct linux_logo *logo_dup;
-
- if (!logo || logo->type != LINUX_LOGO_MONO)
- return 0;
-
- /* The logo is __init, so we must make a copy for later use */
- logo_data = kmemdup(logo->data,
- size_mul(DIV_ROUND_UP(logo->width, BITS_PER_BYTE),
logo->height),
- GFP_KERNEL);
- if (!logo_data)
- return -ENOMEM;
-
- logo_dup = kmemdup(logo, sizeof(*logo), GFP_KERNEL);
- if (!logo_dup) {
- kfree(logo_data);
- return -ENOMEM;
- }
-
- logo_dup->data = logo_data;
- logo_mono = logo_dup;
-
- return 0;
- }
-
- device_initcall(drm_panic_setup_logo);
- #else
- #define logo_mono ((const struct linux_logo *)NULL)
- #endif
-
- /*
- * Blit & Fill functions
- */
- static void drm_panic_blit_pixel(struct drm_scanout_buffer *sb, struct
drm_rect *clip,
- const u8 *sbuf8, unsigned int spitch, unsigned
int scale,
- u32 fg_color)
- {
- unsigned int y, x;
-
- for (y = 0; y < drm_rect_height(clip); y++)
- for (x = 0; x < drm_rect_width(clip); x++)
- if (drm_draw_is_pixel_fg(sbuf8, spitch, x / scale, y /
scale))
- sb->set_pixel(sb, clip->x1 + x, clip->y1 + y,
fg_color);
- }
-
- static void drm_panic_write_pixel16(void *vaddr, unsigned int offset, u16
color)
- {
- u16 *p = vaddr + offset;
-
- *p = color;
- }
-
- static void drm_panic_write_pixel24(void *vaddr, unsigned int offset, u32
color)
- {
- u8 *p = vaddr + offset;
-
- *p++ = color & 0xff;
- color >>= 8;
- *p++ = color & 0xff;
- color >>= 8;
- *p = color & 0xff;
- }
-
- /*
- * Special case if the pixel crosses page boundaries
- */
- static void drm_panic_write_pixel24_xpage(void *vaddr, struct page *next_page,
- unsigned int offset, u32 color)
- {
- u8 *vaddr2;
- u8 *p = vaddr + offset;
-
- vaddr2 = kmap_local_page_try_from_panic(next_page);
-
- *p++ = color & 0xff;
- color >>= 8;
-
- if (offset == PAGE_SIZE - 1)
- p = vaddr2;
-
- *p++ = color & 0xff;
- color >>= 8;
-
- if (offset == PAGE_SIZE - 2)
- p = vaddr2;
-
- *p = color & 0xff;
- kunmap_local(vaddr2);
- }
-
- static void drm_panic_write_pixel32(void *vaddr, unsigned int offset, u32
color)
- {
- u32 *p = vaddr + offset;
-
- *p = color;
- }
-
- static void drm_panic_write_pixel(void *vaddr, unsigned int offset, u32
color, unsigned int cpp)
- {
- switch (cpp) {
- case 2:
- drm_panic_write_pixel16(vaddr, offset, color);
- break;
- case 3:
- drm_panic_write_pixel24(vaddr, offset, color);
- break;
- case 4:
- drm_panic_write_pixel32(vaddr, offset, color);
- break;
- default:
- pr_debug_once("Can't blit with pixel width %d\n", cpp);
- }
- }
-
- /*
- * The scanout buffer pages are not mapped, so for each pixel,
- * use kmap_local_page_try_from_panic() to map the page, and write the pixel.
- * Try to keep the map from the previous pixel, to avoid too much map/unmap.
- */
- static void drm_panic_blit_page(struct page **pages, unsigned int dpitch,
- unsigned int cpp, const u8 *sbuf8,
- unsigned int spitch, struct drm_rect *clip,
- unsigned int scale, u32 fg32)
- {
- unsigned int y, x;
- unsigned int page = ~0;
- unsigned int height = drm_rect_height(clip);
- unsigned int width = drm_rect_width(clip);
- void *vaddr = NULL;
-
- for (y = 0; y < height; y++) {
- for (x = 0; x < width; x++) {
- if (drm_draw_is_pixel_fg(sbuf8, spitch, x / scale, y /
scale)) {
- unsigned int new_page;
- unsigned int offset;
-
- offset = (y + clip->y1) * dpitch + (x +
clip->x1) * cpp;
- new_page = offset >> PAGE_SHIFT;
- offset = offset % PAGE_SIZE;
- if (new_page != page) {
- if (!pages[new_page])
- continue;
- if (vaddr)
- kunmap_local(vaddr);
- page = new_page;
- vaddr =
kmap_local_page_try_from_panic(pages[page]);
- }
- if (!vaddr)
- continue;
-
- // Special case for 24bit, as a pixel might
cross page boundaries
- if (cpp == 3 && offset + 3 > PAGE_SIZE)
- drm_panic_write_pixel24_xpage(vaddr,
pages[page + 1],
- offset,
fg32);
- else
- drm_panic_write_pixel(vaddr, offset,
fg32, cpp);
- }
- }
- }
- if (vaddr)
- kunmap_local(vaddr);
- }
-
- /*
- * drm_panic_blit - convert a monochrome image to a linear framebuffer
- * @sb: destination scanout buffer
- * @clip: destination rectangle
- * @sbuf8: source buffer, in monochrome format, 8 pixels per byte.
- * @spitch: source pitch in bytes
- * @scale: integer scale, source buffer is scale time smaller than destination
- * rectangle
- * @fg_color: foreground color, in destination format
- *
- * This can be used to draw a font character, which is a monochrome image, to
a
- * framebuffer in other supported format.
- */
- static void drm_panic_blit(struct drm_scanout_buffer *sb, struct drm_rect
*clip,
- const u8 *sbuf8, unsigned int spitch,
- unsigned int scale, u32 fg_color)
-
- {
- struct iosys_map map;
-
- if (sb->set_pixel)
- return drm_panic_blit_pixel(sb, clip, sbuf8, spitch, scale,
fg_color);
-
- if (sb->pages)
- return drm_panic_blit_page(sb->pages, sb->pitch[0],
sb->format->cpp[0],
- sbuf8, spitch, clip, scale,
fg_color);
-
- map = sb->map[0];
- iosys_map_incr(&map, clip->y1 * sb->pitch[0] + clip->x1 *
sb->format->cpp[0]);
-
- switch (sb->format->cpp[0]) {
- case 2:
- drm_draw_blit16(&map, sb->pitch[0], sbuf8, spitch,
- drm_rect_height(clip), drm_rect_width(clip),
scale, fg_color);
- break;
- case 3:
- drm_draw_blit24(&map, sb->pitch[0], sbuf8, spitch,
- drm_rect_height(clip), drm_rect_width(clip),
scale, fg_color);
- break;
- case 4:
- drm_draw_blit32(&map, sb->pitch[0], sbuf8, spitch,
- drm_rect_height(clip), drm_rect_width(clip),
scale, fg_color);
- break;
- default:
- WARN_ONCE(1, "Can't blit with pixel width %d\n",
sb->format->cpp[0]);
- }
- }
-
- static void drm_panic_fill_pixel(struct drm_scanout_buffer *sb,
- struct drm_rect *clip,
- u32 color)
- {
- unsigned int y, x;
-
- for (y = 0; y < drm_rect_height(clip); y++)
- for (x = 0; x < drm_rect_width(clip); x++)
- sb->set_pixel(sb, clip->x1 + x, clip->y1 + y, color);
- }
-
- static void drm_panic_fill_page(struct page **pages, unsigned int dpitch,
- unsigned int cpp, struct drm_rect *clip,
- u32 color)
- {
- unsigned int y, x;
- unsigned int page = ~0;
- void *vaddr = NULL;
-
- for (y = clip->y1; y < clip->y2; y++) {
- for (x = clip->x1; x < clip->x2; x++) {
- unsigned int new_page;
- unsigned int offset;
-
- offset = y * dpitch + x * cpp;
- new_page = offset >> PAGE_SHIFT;
- offset = offset % PAGE_SIZE;
- if (new_page != page) {
- if (vaddr)
- kunmap_local(vaddr);
- page = new_page;
- vaddr =
kmap_local_page_try_from_panic(pages[page]);
- }
- if (!vaddr)
- continue;
-
- // Special case for 24bit, as a pixel might cross page
boundaries
- if (cpp == 3 && offset + 3 > PAGE_SIZE)
- drm_panic_write_pixel24_xpage(vaddr, pages[page
+ 1],
- offset, color);
- else
- drm_panic_write_pixel(vaddr, offset, color,
cpp);
- }
- }
- if (vaddr)
- kunmap_local(vaddr);
- }
-
- /*
- * drm_panic_fill - Fill a rectangle with a color
- * @sb: destination scanout buffer
- * @clip: destination rectangle
- * @color: foreground color, in destination format
- *
- * Fill a rectangle with a color, in a linear framebuffer.
- */
- static void drm_panic_fill(struct drm_scanout_buffer *sb, struct drm_rect
*clip,
- u32 color)
- {
- struct iosys_map map;
-
- if (sb->set_pixel)
- return drm_panic_fill_pixel(sb, clip, color);
-
- if (sb->pages)
- return drm_panic_fill_page(sb->pages, sb->pitch[0],
sb->format->cpp[0],
- clip, color);
-
- map = sb->map[0];
- iosys_map_incr(&map, clip->y1 * sb->pitch[0] + clip->x1 *
sb->format->cpp[0]);
-
- switch (sb->format->cpp[0]) {
- case 2:
- drm_draw_fill16(&map, sb->pitch[0], drm_rect_height(clip),
- drm_rect_width(clip), color);
- break;
- case 3:
- drm_draw_fill24(&map, sb->pitch[0], drm_rect_height(clip),
- drm_rect_width(clip), color);
- break;
- case 4:
- drm_draw_fill32(&map, sb->pitch[0], drm_rect_height(clip),
- drm_rect_width(clip), color);
- break;
- default:
- WARN_ONCE(1, "Can't fill with pixel width %d\n",
sb->format->cpp[0]);
- }
- }
-
- static unsigned int get_max_line_len(const struct drm_panic_line *lines, int
len)
- {
- int i;
- unsigned int max = 0;
-
- for (i = 0; i < len; i++)
- max = max(lines[i].len, max);
- return max;
- }
-
- /*
- * Draw a text in a rectangle on a framebuffer. The text is truncated if it
overflows the rectangle
- */
- static void draw_txt_rectangle(struct drm_scanout_buffer *sb,
- const struct font_desc *font,
- const struct drm_panic_line *msg,
- unsigned int msg_lines,
- bool centered,
- struct drm_rect *clip,
- u32 color)
- {
- int i, j;
- const u8 *src;
- size_t font_pitch = DIV_ROUND_UP(font->width, 8);
- struct drm_rect rec;
-
- msg_lines = min(msg_lines, drm_rect_height(clip) / font->height);
- for (i = 0; i < msg_lines; i++) {
- size_t line_len = min(msg[i].len, drm_rect_width(clip) /
font->width);
-
- rec.y1 = clip->y1 + i * font->height;
- rec.y2 = rec.y1 + font->height;
- rec.x1 = clip->x1;
-
- if (centered)
- rec.x1 += (drm_rect_width(clip) - (line_len *
font->width)) / 2;
-
- for (j = 0; j < line_len; j++) {
- src = font_data_glyph_buf(font->data, font->width,
font->height,
- (unsigned char)msg[i].txt[j]);
- rec.x2 = rec.x1 + font->width;
- if (src)
- drm_panic_blit(sb, &rec, src, font_pitch, 1,
color);
- rec.x1 += font->width;
- }
- }
- }
-
- static void drm_panic_logo_rect(struct drm_rect *rect, const struct font_desc
*font)
- {
- if (logo_mono) {
- drm_rect_init(rect, 0, 0, logo_mono->width, logo_mono->height);
- } else {
- int logo_width = get_max_line_len(logo_ascii, logo_ascii_lines) *
font->width;
-
- drm_rect_init(rect, 0, 0, logo_width, logo_ascii_lines *
font->height);
- }
- }
-
- static void drm_panic_logo_draw(struct drm_scanout_buffer *sb, struct
drm_rect *rect,
- const struct font_desc *font, u32 fg_color)
- {
- if (rect->x2 > sb->width || rect->y2 > sb->height)
- return;
-
- if (logo_mono)
- drm_panic_blit(sb, rect, logo_mono->data,
- DIV_ROUND_UP(drm_rect_width(rect), 8), 1,
fg_color);
- else
- draw_txt_rectangle(sb, font, logo_ascii, logo_ascii_lines,
false, rect,
- fg_color);
- }
-
- static void draw_panic_screen_user(struct drm_scanout_buffer *sb)
- {
- u32 fg_color =
drm_draw_color_from_xrgb8888(CONFIG_DRM_PANIC_FOREGROUND_COLOR,
- sb->format->format);
- u32 bg_color =
drm_draw_color_from_xrgb8888(CONFIG_DRM_PANIC_BACKGROUND_COLOR,
- sb->format->format);
- const struct font_desc *font = get_default_font(sb->width, sb->height,
NULL, NULL);
- struct drm_rect r_screen, r_logo, r_msg;
- unsigned int msg_width, msg_height;
-
- if (!font)
- return;
-
- r_screen = DRM_RECT_INIT(0, 0, sb->width, sb->height);
- drm_panic_logo_rect(&r_logo, font);
-
- msg_width = min(get_max_line_len(panic_msg, panic_msg_lines) *
font->width, sb->width);
- msg_height = min(panic_msg_lines * font->height, sb->height);
- r_msg = DRM_RECT_INIT(0, 0, msg_width, msg_height);
-
- /* Center the panic message */
- drm_rect_translate(&r_msg, (sb->width - r_msg.x2) / 2, (sb->height -
r_msg.y2) / 2);
-
- /* Fill with the background color, and draw text on top */
- drm_panic_fill(sb, &r_screen, bg_color);
-
- if (!drm_rect_overlap(&r_logo, &r_msg))
- drm_panic_logo_draw(sb, &r_logo, font, fg_color);
-
- draw_txt_rectangle(sb, font, panic_msg, panic_msg_lines, true, &r_msg,
fg_color);
- }
-
- /*
- * Draw one line of kmsg, and handle wrapping if it won't fit in the screen
width.
- * Return the y-offset of the next line.
- */
- static int draw_line_with_wrap(struct drm_scanout_buffer *sb, const struct
font_desc *font,
- struct drm_panic_line *line, int yoffset, u32
fg_color)
- {
- int chars_per_row = sb->width / font->width;
- struct drm_rect r_txt = DRM_RECT_INIT(0, yoffset, sb->width,
font->height);
- struct drm_panic_line line_wrap;
-
- if (line->len > chars_per_row) {
- line_wrap.len = line->len % chars_per_row;
- line_wrap.txt = line->txt + line->len - line_wrap.len;
- draw_txt_rectangle(sb, font, &line_wrap, 1, false, &r_txt,
fg_color);
- r_txt.y1 -= font->height;
- if (r_txt.y1 < 0)
- return r_txt.y1;
- while (line_wrap.txt > line->txt) {
- line_wrap.txt -= chars_per_row;
- line_wrap.len = chars_per_row;
- draw_txt_rectangle(sb, font, &line_wrap, 1, false,
&r_txt, fg_color);
- r_txt.y1 -= font->height;
- if (r_txt.y1 < 0)
- return r_txt.y1;
- }
- } else {
- draw_txt_rectangle(sb, font, line, 1, false, &r_txt, fg_color);
- r_txt.y1 -= font->height;
- }
- return r_txt.y1;
- }
-
- /*
- * Draw the kmsg buffer to the screen, starting from the youngest message at
the bottom,
- * and going up until reaching the top of the screen.
- */
- static void draw_panic_screen_kmsg(struct drm_scanout_buffer *sb)
- {
- u32 fg_color =
drm_draw_color_from_xrgb8888(CONFIG_DRM_PANIC_FOREGROUND_COLOR,
- sb->format->format);
- u32 bg_color =
drm_draw_color_from_xrgb8888(CONFIG_DRM_PANIC_BACKGROUND_COLOR,
- sb->format->format);
- const struct font_desc *font = get_default_font(sb->width, sb->height,
NULL, NULL);
- struct drm_rect r_screen = DRM_RECT_INIT(0, 0, sb->width, sb->height);
- struct kmsg_dump_iter iter;
- /* the size printk formats one record into, too big for the stack */
- static char kmsg_buf[2048];
- size_t kmsg_len;
- struct drm_panic_line line;
- int yoffset;
-
- if (!font || font->width > sb->width)
- return;
-
- yoffset = sb->height - font->height - (sb->height % font->height) / 2;
-
- /* Fill with the background color, and draw text on top */
- drm_panic_fill(sb, &r_screen, bg_color);
-
- kmsg_dump_rewind(&iter);
- while (yoffset >= 0 && kmsg_dump_get_buffer(&iter, false, kmsg_buf,
- sizeof(kmsg_buf), &kmsg_len)) {
- char *start;
- char *end;
-
- /* a record that does not fit comes back empty, every time */
- if (!kmsg_len)
- break;
-
- /* ignore terminating NUL and newline */
- start = kmsg_buf + kmsg_len - 2;
- end = kmsg_buf + kmsg_len - 1;
- while (start > kmsg_buf && yoffset >= 0) {
- while (start > kmsg_buf && *start != '\n')
- start--;
- /* don't count the newline character */
- line.txt = start + (start == kmsg_buf ? 0 : 1);
- line.len = end - line.txt;
-
- yoffset = draw_line_with_wrap(sb, font, &line, yoffset,
fg_color);
- end = start;
- start--;
- }
- }
- }
-
#if defined(CONFIG_DRM_PANIC_SCREEN_QR_CODE)
- /*
- * It is unwise to allocate memory in the panic callback, so the buffers are
- * pre-allocated. Only 2 buffers and the zlib workspace are needed.
- * Two buffers are enough, using the following buffer usage:
- * 1) kmsg messages are dumped in buffer1
- * 2) kmsg is zlib-compressed into buffer2
- * 3) compressed kmsg is encoded as QR-code Numeric stream in buffer1
- * 4) QR-code image is generated in buffer2
- * The Max QR code size is V40, 177x177, 4071 bytes for image, 2956 bytes for
- * data segments.
- *
- * Typically, ~7500 bytes of kmsg, are compressed into 2800 bytes, which fits
in
- * a V40 QR-code (177x177).
- *
- * If CONFIG_DRM_PANIC_SCREEN_QR_CODE_URL is not set, the kmsg data will be
put
- * directly in the QR code.
- * 1) kmsg messages are dumped in buffer1
- * 2) kmsg message is encoded as byte stream in buffer2
- * 3) QR-code image is generated in buffer1
- */
-
static uint panic_qr_version = CONFIG_DRM_PANIC_SCREEN_QR_VERSION;
module_param(panic_qr_version, uint, 0644);
MODULE_PARM_DESC(panic_qr_version, "maximum version (size) of the QR code");
-
- #define MAX_QR_DATA 2956
- #define MAX_ZLIB_RATIO 3
- #define QR_BUFFER1_SIZE (MAX_ZLIB_RATIO * MAX_QR_DATA) /* Must also be > 4071
*/
- #define QR_BUFFER2_SIZE 4096
- #define QR_MARGIN 4 /* 4 modules of foreground color around the qr
code */
-
- /* Compression parameters */
- #define COMPR_LEVEL 6
- #define WINDOW_BITS 12
- #define MEM_LEVEL 4
-
- static char *qrbuf1;
- static char *qrbuf2;
- static struct z_stream_s stream;
-
- static void __init drm_panic_qr_init(void)
- {
- qrbuf1 = kmalloc(QR_BUFFER1_SIZE, GFP_KERNEL);
- qrbuf2 = kmalloc(QR_BUFFER2_SIZE, GFP_KERNEL);
- stream.workspace = kmalloc(zlib_deflate_workspacesize(WINDOW_BITS,
MEM_LEVEL),
- GFP_KERNEL);
- }
-
- static void drm_panic_qr_exit(void)
- {
- kfree(qrbuf1);
- qrbuf1 = NULL;
- kfree(qrbuf2);
- qrbuf2 = NULL;
- kfree(stream.workspace);
- stream.workspace = NULL;
- }
-
- static int drm_panic_get_qr_code_url(u8 **qr_image)
- {
- struct kmsg_dump_iter iter;
- char url[256];
- size_t kmsg_len, max_kmsg_size;
- char *kmsg;
- int max_qr_data_size, url_len;
-
- url_len = snprintf(url, sizeof(url), CONFIG_DRM_PANIC_SCREEN_QR_CODE_URL
"?a=%s&v=%s&z=",
- utsname()->machine, utsname()->release);
-
- max_qr_data_size = drm_panic_qr_max_data_size(panic_qr_version,
url_len);
- max_kmsg_size = min(MAX_ZLIB_RATIO * max_qr_data_size, QR_BUFFER1_SIZE);
-
- /* get kmsg to buffer 1 */
- kmsg_dump_rewind(&iter);
- kmsg_dump_get_buffer(&iter, false, qrbuf1, max_kmsg_size, &kmsg_len);
-
- if (!kmsg_len)
- return -ENODATA;
- kmsg = qrbuf1;
-
- try_again:
- if (zlib_deflateInit2(&stream, COMPR_LEVEL, Z_DEFLATED, WINDOW_BITS,
- MEM_LEVEL, Z_DEFAULT_STRATEGY) != Z_OK)
- return -EINVAL;
-
- stream.next_in = kmsg;
- stream.avail_in = kmsg_len;
- stream.total_in = 0;
- stream.next_out = qrbuf2;
- stream.avail_out = QR_BUFFER2_SIZE;
- stream.total_out = 0;
-
- if (zlib_deflate(&stream, Z_FINISH) != Z_STREAM_END)
- return -EINVAL;
-
- if (zlib_deflateEnd(&stream) != Z_OK)
- return -EINVAL;
-
- if (stream.total_out > max_qr_data_size) {
- /* too much data for the QR code, so skip the first line and
try again */
- kmsg = strchr(kmsg, '\n');
- if (!kmsg)
- return -EINVAL;
- /* skip the first \n */
- kmsg += 1;
- kmsg_len = strlen(kmsg);
- goto try_again;
- }
- *qr_image = qrbuf2;
-
- /* generate qr code image in buffer2 */
- return drm_panic_qr_generate(url, qrbuf2, stream.total_out,
QR_BUFFER2_SIZE,
- qrbuf1, QR_BUFFER1_SIZE);
- }
-
- static int drm_panic_get_qr_code_raw(u8 **qr_image)
- {
- struct kmsg_dump_iter iter;
- size_t kmsg_len;
- size_t max_kmsg_size = min(drm_panic_qr_max_data_size(panic_qr_version,
0),
- QR_BUFFER1_SIZE);
-
- kmsg_dump_rewind(&iter);
- kmsg_dump_get_buffer(&iter, false, qrbuf1, max_kmsg_size, &kmsg_len);
- if (!kmsg_len)
- return -ENODATA;
-
- *qr_image = qrbuf1;
- return drm_panic_qr_generate(NULL, qrbuf1, kmsg_len, QR_BUFFER1_SIZE,
- qrbuf2, QR_BUFFER2_SIZE);
- }
-
- static int drm_panic_get_qr_code(u8 **qr_image)
- {
- if (strlen(CONFIG_DRM_PANIC_SCREEN_QR_CODE_URL) > 0)
- return drm_panic_get_qr_code_url(qr_image);
- else
- return drm_panic_get_qr_code_raw(qr_image);
- }
-
- /*
- * Draw the panic message at the center of the screen, with a QR Code
- */
- static int _draw_panic_screen_qr_code(struct drm_scanout_buffer *sb)
- {
- u32 fg_color =
drm_draw_color_from_xrgb8888(CONFIG_DRM_PANIC_FOREGROUND_COLOR,
- sb->format->format);
- u32 bg_color =
drm_draw_color_from_xrgb8888(CONFIG_DRM_PANIC_BACKGROUND_COLOR,
- sb->format->format);
- const struct font_desc *font = get_default_font(sb->width, sb->height,
NULL, NULL);
- struct drm_rect r_screen, r_logo, r_msg, r_qr, r_qr_canvas;
- unsigned int max_qr_size, scale;
- unsigned int msg_width, msg_height;
- int qr_width, qr_canvas_width, qr_pitch, v_margin;
- u8 *qr_image;
-
- if (!font || !qrbuf1 || !qrbuf2 || !stream.workspace)
- return -ENOMEM;
-
- r_screen = DRM_RECT_INIT(0, 0, sb->width, sb->height);
-
- drm_panic_logo_rect(&r_logo, font);
-
- msg_width = min(get_max_line_len(panic_msg, panic_msg_lines) *
font->width, sb->width);
- msg_height = min(panic_msg_lines * font->height, sb->height);
- r_msg = DRM_RECT_INIT(0, 0, msg_width, msg_height);
-
- max_qr_size = min(3 * sb->width / 4, 3 * sb->height / 4);
-
- qr_width = drm_panic_get_qr_code(&qr_image);
- if (qr_width <= 0)
- return -ENOSPC;
-
- qr_canvas_width = qr_width + QR_MARGIN * 2;
- scale = max_qr_size / qr_canvas_width;
- /* QR code is not readable if not scaled at least by 2 */
- if (scale < 2)
- return -ENOSPC;
-
- pr_debug("QR width %d and scale %d\n", qr_width, scale);
- r_qr_canvas = DRM_RECT_INIT(0, 0, qr_canvas_width * scale,
qr_canvas_width * scale);
-
- v_margin = sb->height - drm_rect_height(&r_qr_canvas) -
drm_rect_height(&r_msg);
- if (v_margin < 0)
- return -ENOSPC;
- v_margin /= 5;
-
- drm_rect_translate(&r_qr_canvas, (sb->width - r_qr_canvas.x2) / 2, 2 *
v_margin);
- r_qr = DRM_RECT_INIT(r_qr_canvas.x1 + QR_MARGIN * scale, r_qr_canvas.y1
+ QR_MARGIN * scale,
- qr_width * scale, qr_width * scale);
-
- /* Center the panic message */
- drm_rect_translate(&r_msg, (sb->width - r_msg.x2) / 2,
- 3 * v_margin + drm_rect_height(&r_qr_canvas));
-
- /* Fill with the background color, and draw text on top */
- drm_panic_fill(sb, &r_screen, bg_color);
-
- if (!drm_rect_overlap(&r_logo, &r_msg) && !drm_rect_overlap(&r_logo,
&r_qr_canvas))
- drm_panic_logo_draw(sb, &r_logo, font, fg_color);
-
- draw_txt_rectangle(sb, font, panic_msg, panic_msg_lines, true, &r_msg,
fg_color);
-
- /* Draw the qr code */
- qr_pitch = DIV_ROUND_UP(qr_width, 8);
- drm_panic_fill(sb, &r_qr_canvas, fg_color);
- drm_panic_fill(sb, &r_qr, bg_color);
- drm_panic_blit(sb, &r_qr, qr_image, qr_pitch, scale, fg_color);
- return 0;
- }
-
- static void draw_panic_screen_qr_code(struct drm_scanout_buffer *sb)
- {
- if (_draw_panic_screen_qr_code(sb))
- draw_panic_screen_user(sb);
- }
- #else
- static void drm_panic_qr_init(void) {};
- static void drm_panic_qr_exit(void) {};
#endif
- enum drm_panic_type {
- DRM_PANIC_TYPE_KMSG,
- DRM_PANIC_TYPE_USER,
- DRM_PANIC_TYPE_QR,
- };
-
static enum drm_panic_type drm_panic_type = -1;
static const char *drm_panic_type_map[] = {
@@@ -840,7 -66,7 +66,7 @@@ static int drm_panic_type_set(const cha
unsigned int i;
for (i = 0; i < ARRAY_SIZE(drm_panic_type_map); i++) {
- if (!strcmp(val, drm_panic_type_map[i])) {
+ if (sysfs_streq(val, drm_panic_type_map[i])) {
drm_panic_type = i;
return 0;
}
@@@ -869,91 -95,34 +95,34 @@@ MODULE_PARM_DESC(panic_screen
#endif
CONFIG_DRM_PANIC_SCREEN "]");
- /*
- * drm_panic_is_format_supported()
- * @format: a fourcc color code
- * Returns: true if supported, false otherwise.
- *
- * Check if drm_panic will be able to use this color format.
- */
- static bool drm_panic_is_format_supported(const struct drm_format_info
*format)
- {
- if (format->num_planes != 1)
- return false;
- return drm_draw_can_convert_from_xrgb8888(format->format);
- }
+ #define drm_panic_trylock(dev, flags) \
+ raw_spin_trylock_irqsave(&(dev)->mode_config.panic_lock, flags)
- static void draw_panic_dispatch(struct drm_scanout_buffer *sb)
+ static void drm_panic_display_panic_screen(struct drm_plane *plane, const
char *description)
{
- switch (drm_panic_type) {
- case DRM_PANIC_TYPE_KMSG:
- draw_panic_screen_kmsg(sb);
- break;
-
- #if IS_ENABLED(CONFIG_DRM_PANIC_SCREEN_QR_CODE)
- case DRM_PANIC_TYPE_QR:
- draw_panic_screen_qr_code(sb);
- break;
+ #if defined(CONFIG_DRM_PANIC_FOREGROUND_COLOR)
+ u32 fg_color = CONFIG_DRM_PANIC_FOREGROUND_COLOR;
+ #else
+ u32 fg_color = 0x00ffffff;
#endif
-
- case DRM_PANIC_TYPE_USER:
- default:
- draw_panic_screen_user(sb);
- }
- }
-
- static void drm_panic_set_description(const char *description)
- {
- u32 len;
-
- if (description) {
- struct drm_panic_line *desc_line = &panic_msg[panic_msg_lines -
1];
-
- desc_line->txt = description;
- len = strlen(description);
- /* ignore the last newline character */
- if (len && description[len - 1] == '\n')
- len -= 1;
- desc_line->len = len;
- }
- }
-
- static void drm_panic_clear_description(void)
- {
- struct drm_panic_line *desc_line = &panic_msg[panic_msg_lines - 1];
-
- desc_line->len = 0;
- desc_line->txt = NULL;
- }
-
- static void draw_panic_plane(struct drm_plane *plane, const char *description)
- {
- struct drm_scanout_buffer sb = { };
- int ret;
+ #if defined(CONFIG_DRM_PANIC_BACKGROUND_COLOR)
+ u32 bg_color = CONFIG_DRM_PANIC_BACKGROUND_COLOR;
+ #else
+ u32 bg_color = 0x00000000;
+ #endif
+ #if IS_ENABLED(CONFIG_DRM_PANIC_SCREEN_QR_CODE)
+ unsigned int qr_version = panic_qr_version;
+ #else
+ unsigned int qr_version = 0;
+ #endif
+ struct drm_device *dev = plane->dev;
unsigned long flags;
- if (!drm_panic_trylock(plane->dev, flags))
- return;
-
- ret = plane->helper_private->get_scanout_buffer(plane, &sb);
-
- if (ret || !drm_panic_is_format_supported(sb.format))
- goto unlock;
-
- /* One of these should be set, or it can't draw pixels */
- if (!sb.set_pixel && !sb.pages && iosys_map_is_null(&sb.map[0]))
- goto unlock;
-
- drm_panic_set_description(description);
-
- draw_panic_dispatch(&sb);
- if (plane->helper_private->panic_flush)
- plane->helper_private->panic_flush(plane);
-
- drm_panic_clear_description();
-
- unlock:
- drm_panic_unlock(plane->dev, flags);
+ if (drm_panic_trylock(dev, flags)) {
+ plane->funcs->display_panic_screen(plane, description,
drm_panic_type,
+ fg_color, bg_color,
qr_version);
+ drm_panic_unlock(dev, flags);
+ }
}
static struct drm_plane *to_drm_plane(struct kmsg_dumper *kd)
@@@ -966,10 -135,9 +135,9 @@@ static void drm_panic(struct kmsg_dumpe
struct drm_plane *plane = to_drm_plane(dumper);
if (detail->reason == KMSG_DUMP_PANIC)
- draw_panic_plane(plane, detail->description);
+ drm_panic_display_panic_screen(plane, detail->description);
}
-
/*
* DEBUG FS, This is currently unsafe.
* Create one file per plane, so it's possible to debug one plane at a time.
@@@ -986,7 -154,7 +154,7 @@@ static ssize_t debugfs_trigger_write(st
if (kstrtobool_from_user(user_buf, count, &run) == 0 && run) {
struct drm_plane *plane = file->private_data;
- draw_panic_plane(plane, "Test from debugfs");
+ drm_panic_display_panic_screen(plane, "Test from debugfs");
}
return count;
}
@@@ -1022,9 -190,13 +190,13 @@@ bool drm_panic_is_enabled(struct drm_de
if (!dev->mode_config.num_total_plane)
return false;
- drm_for_each_plane(plane, dev)
- if (plane->helper_private &&
plane->helper_private->get_scanout_buffer)
- return true;
+ drm_for_each_plane(plane, dev) {
+ if (plane->type != DRM_PLANE_TYPE_PRIMARY)
+ continue;
+ if (!plane->funcs || !plane->funcs->display_panic_screen)
+ continue;
+ return true;
+ }
return false;
}
EXPORT_SYMBOL(drm_panic_is_enabled);
@@@ -1042,7 -214,9 +214,9 @@@ void drm_panic_register(struct drm_devi
return;
drm_for_each_plane(plane, dev) {
- if (!plane->helper_private ||
!plane->helper_private->get_scanout_buffer)
+ if (plane->type != DRM_PLANE_TYPE_PRIMARY)
+ continue;
+ if (!plane->funcs || !plane->funcs->display_panic_screen)
continue;
plane->kmsg_panic.dump = drm_panic;
plane->kmsg_panic.max_reason = KMSG_DUMP_PANIC;
@@@ -1069,7 -243,9 +243,9 @@@ void drm_panic_unregister(struct drm_de
return;
drm_for_each_plane(plane, dev) {
- if (!plane->helper_private ||
!plane->helper_private->get_scanout_buffer)
+ if (plane->type != DRM_PLANE_TYPE_PRIMARY)
+ continue;
+ if (!plane->funcs || !plane->funcs->display_panic_screen)
continue;
kmsg_dump_unregister(&plane->kmsg_panic);
}
@@@ -1085,17 -261,4 +261,4 @@@ void __init drm_panic_init(void
CONFIG_DRM_PANIC_SCREEN);
drm_panic_type = DRM_PANIC_TYPE_USER;
}
- drm_panic_qr_init();
}
-
- /**
- * drm_panic_exit() - Free the resources taken by drm_panic_exit()
- */
- void drm_panic_exit(void)
- {
- drm_panic_qr_exit();
- }
-
- #ifdef CONFIG_DRM_KUNIT_TEST
- #include "tests/drm_panic_test.c"
- #endif
