diff options
Diffstat (limited to 'drivers/gpu/drm/clients')
| -rw-r--r-- | drivers/gpu/drm/clients/Kconfig | 123 | ||||
| -rw-r--r-- | drivers/gpu/drm/clients/Makefile | 8 | ||||
| -rw-r--r-- | drivers/gpu/drm/clients/drm_client_internal.h | 25 | ||||
| -rw-r--r-- | drivers/gpu/drm/clients/drm_client_setup.c | 91 | ||||
| -rw-r--r-- | drivers/gpu/drm/clients/drm_fbdev_client.c | 167 | ||||
| -rw-r--r-- | drivers/gpu/drm/clients/drm_log.c | 420 |
6 files changed, 834 insertions, 0 deletions
diff --git a/drivers/gpu/drm/clients/Kconfig b/drivers/gpu/drm/clients/Kconfig new file mode 100644 index 000000000000..6096c623d9d5 --- /dev/null +++ b/drivers/gpu/drm/clients/Kconfig @@ -0,0 +1,123 @@ +# SPDX-License-Identifier: GPL-2.0-only + +config DRM_CLIENT_LIB + tristate + depends on DRM + select DRM_KMS_HELPER if DRM_FBDEV_EMULATION + select FB_CORE if DRM_FBDEV_EMULATION + help + This option enables the DRM client library and selects all + modules and components according to the enabled clients. + +config DRM_CLIENT_SELECTION + tristate + depends on DRM + select DRM_CLIENT_LIB if DRM_CLIENT_LOG + select DRM_CLIENT_LIB if DRM_FBDEV_EMULATION + help + Drivers that support in-kernel DRM clients have to select this + option. + +config DRM_CLIENT_SETUP + bool + depends on DRM_CLIENT_SELECTION + help + Enables the DRM client selection. DRM drivers that support the + default clients should select DRM_CLIENT_SELECTION instead. + +menu "Supported DRM clients" + depends on DRM_CLIENT_SELECTION + +config DRM_FBDEV_EMULATION + bool "Enable legacy fbdev support for your modesetting driver" + depends on DRM_CLIENT_SELECTION + select DRM_CLIENT + select DRM_CLIENT_SETUP + select FRAMEBUFFER_CONSOLE_DETECT_PRIMARY if FRAMEBUFFER_CONSOLE + default FB + help + Choose this option if you have a need for the legacy fbdev + support. Note that this support also provides the linux console + support on top of your modesetting driver. + + If in doubt, say "Y". + +config DRM_FBDEV_OVERALLOC + int "Overallocation of the fbdev buffer" + depends on DRM_FBDEV_EMULATION + default 100 + help + Defines the fbdev buffer overallocation in percent. Default + is 100. Typical values for double buffering will be 200, + triple buffering 300. + +config DRM_FBDEV_LEAK_PHYS_SMEM + bool "Shamelessly allow leaking of fbdev physical address (DANGEROUS)" + depends on DRM_FBDEV_EMULATION && EXPERT + default n + help + In order to keep user-space compatibility, we want in certain + use-cases to keep leaking the fbdev physical address to the + user-space program handling the fbdev buffer. + This affects, not only, Amlogic, Allwinner or Rockchip devices + with ARM Mali GPUs using a userspace Blob. + This option is not supported by upstream developers and should be + removed as soon as possible and be considered as a broken and + legacy behaviour from a modern fbdev device driver. + + Please send any bug reports when using this to your proprietary + software vendor that requires this. + + If in doubt, say "N" or spread the word to your closed source + library vendor. + +config DRM_CLIENT_LOG + bool "Print the kernel boot message on the screen" + depends on DRM_CLIENT_SELECTION + select DRM_CLIENT + select DRM_CLIENT_SETUP + select DRM_DRAW + select FONT_SUPPORT + help + This enable a drm logger, that will print the kernel messages to the + screen until the userspace is ready to take over. + + If you only need logs, but no terminal, or if you prefer userspace + terminal, say "Y". + +choice + prompt "Default DRM Client" + depends on DRM_CLIENT_SELECTION + depends on DRM_FBDEV_EMULATION || DRM_CLIENT_LOG + default DRM_CLIENT_DEFAULT_FBDEV + help + Selects the default drm client. + + The selection made here can be overridden by using the kernel + command line 'drm_client_lib.active=fbdev' option. + +config DRM_CLIENT_DEFAULT_FBDEV + bool "fbdev" + depends on DRM_FBDEV_EMULATION + help + Use fbdev emulation as default drm client. This is needed to have + fbcon on top of a drm driver. + +config DRM_CLIENT_DEFAULT_LOG + bool "log" + depends on DRM_CLIENT_LOG + help + Use drm log as default drm client. This will display boot logs on the + screen, but doesn't implement a full terminal. For that you will need + a userspace terminal using drm/kms. + +endchoice + +config DRM_CLIENT_DEFAULT + string + depends on DRM_CLIENT + default "fbdev" if DRM_CLIENT_DEFAULT_FBDEV + default "log" if DRM_CLIENT_DEFAULT_LOG + default "" + +endmenu diff --git a/drivers/gpu/drm/clients/Makefile b/drivers/gpu/drm/clients/Makefile new file mode 100644 index 000000000000..c16addbc327f --- /dev/null +++ b/drivers/gpu/drm/clients/Makefile @@ -0,0 +1,8 @@ +# SPDX-License-Identifier: GPL-2.0 + +subdir-ccflags-y += -I$(src)/.. + +drm_client_lib-y := drm_client_setup.o +drm_client_lib-$(CONFIG_DRM_CLIENT_LOG) += drm_log.o +drm_client_lib-$(CONFIG_DRM_FBDEV_EMULATION) += drm_fbdev_client.o +obj-$(CONFIG_DRM_CLIENT_LIB) += drm_client_lib.o diff --git a/drivers/gpu/drm/clients/drm_client_internal.h b/drivers/gpu/drm/clients/drm_client_internal.h new file mode 100644 index 000000000000..6dc078bf6503 --- /dev/null +++ b/drivers/gpu/drm/clients/drm_client_internal.h @@ -0,0 +1,25 @@ +/* SPDX-License-Identifier: MIT */ + +#ifndef DRM_CLIENT_INTERNAL_H +#define DRM_CLIENT_INTERNAL_H + +struct drm_device; +struct drm_format_info; + +#ifdef CONFIG_DRM_FBDEV_EMULATION +int drm_fbdev_client_setup(struct drm_device *dev, const struct drm_format_info *format); +#else +static inline int drm_fbdev_client_setup(struct drm_device *dev, + const struct drm_format_info *format) +{ + return 0; +} +#endif + +#ifdef CONFIG_DRM_CLIENT_LOG +void drm_log_register(struct drm_device *dev); +#else +static inline void drm_log_register(struct drm_device *dev) {} +#endif + +#endif diff --git a/drivers/gpu/drm/clients/drm_client_setup.c b/drivers/gpu/drm/clients/drm_client_setup.c new file mode 100644 index 000000000000..e17265039ca8 --- /dev/null +++ b/drivers/gpu/drm/clients/drm_client_setup.c @@ -0,0 +1,91 @@ +// SPDX-License-Identifier: MIT + +#include <drm/clients/drm_client_setup.h> +#include <drm/drm_device.h> +#include <drm/drm_fourcc.h> +#include <drm/drm_print.h> + +#include "drm_client_internal.h" + +static char drm_client_default[16] = CONFIG_DRM_CLIENT_DEFAULT; +module_param_string(active, drm_client_default, sizeof(drm_client_default), 0444); +MODULE_PARM_DESC(active, + "Choose which drm client to start, default is" + CONFIG_DRM_CLIENT_DEFAULT "]"); + +/** + * drm_client_setup() - Setup in-kernel DRM clients + * @dev: DRM device + * @format: Preferred pixel format for the device. Use NULL, unless + * there is clearly a driver-preferred format. + * + * This function sets up the in-kernel DRM clients. Restore, hotplug + * events and teardown are all taken care of. + * + * Drivers should call drm_client_setup() after registering the new + * DRM device with drm_dev_register(). This function is safe to call + * even when there are no connectors present. Setup will be retried + * on the next hotplug event. + * + * The clients are destroyed by drm_dev_unregister(). + */ +void drm_client_setup(struct drm_device *dev, const struct drm_format_info *format) +{ + +#ifdef CONFIG_DRM_FBDEV_EMULATION + if (!strcmp(drm_client_default, "fbdev")) { + int ret; + + ret = drm_fbdev_client_setup(dev, format); + if (ret) + drm_warn(dev, "Failed to set up DRM client; error %d\n", ret); + return; + } +#endif + +#ifdef CONFIG_DRM_CLIENT_LOG + if (!strcmp(drm_client_default, "log")) { + drm_log_register(dev); + return; + } +#endif + if (strcmp(drm_client_default, "")) + drm_warn(dev, "Unknown DRM client %s\n", drm_client_default); +} +EXPORT_SYMBOL(drm_client_setup); + +/** + * drm_client_setup_with_fourcc() - Setup in-kernel DRM clients for color mode + * @dev: DRM device + * @fourcc: Preferred pixel format as 4CC code for the device + * + * This function sets up the in-kernel DRM clients. It is equivalent + * to drm_client_setup(), but expects a 4CC code as second argument. + */ +void drm_client_setup_with_fourcc(struct drm_device *dev, u32 fourcc) +{ + drm_client_setup(dev, drm_format_info(fourcc)); +} +EXPORT_SYMBOL(drm_client_setup_with_fourcc); + +/** + * drm_client_setup_with_color_mode() - Setup in-kernel DRM clients for color mode + * @dev: DRM device + * @color_mode: Preferred color mode for the device + * + * This function sets up the in-kernel DRM clients. It is equivalent + * to drm_client_setup(), but expects a color mode as second argument. + * + * Do not use this function in new drivers. Prefer drm_client_setup() with a + * format of NULL. + */ +void drm_client_setup_with_color_mode(struct drm_device *dev, unsigned int color_mode) +{ + u32 fourcc = drm_driver_color_mode_format(dev, color_mode); + + drm_client_setup_with_fourcc(dev, fourcc); +} +EXPORT_SYMBOL(drm_client_setup_with_color_mode); + +MODULE_DESCRIPTION("In-kernel DRM clients"); +MODULE_LICENSE("GPL and additional rights"); diff --git a/drivers/gpu/drm/clients/drm_fbdev_client.c b/drivers/gpu/drm/clients/drm_fbdev_client.c new file mode 100644 index 000000000000..f894ba52bdb5 --- /dev/null +++ b/drivers/gpu/drm/clients/drm_fbdev_client.c @@ -0,0 +1,167 @@ +// SPDX-License-Identifier: MIT + +#include <drm/drm_client.h> +#include <drm/drm_crtc_helper.h> +#include <drm/drm_drv.h> +#include <drm/drm_fb_helper.h> +#include <drm/drm_fourcc.h> +#include <drm/drm_print.h> + +#include "drm_client_internal.h" + +/* + * struct drm_client_funcs + */ + +static void drm_fbdev_client_unregister(struct drm_client_dev *client) +{ + struct drm_fb_helper *fb_helper = drm_fb_helper_from_client(client); + + if (fb_helper->info) { + drm_fb_helper_unregister_info(fb_helper); + } else { + drm_client_release(&fb_helper->client); + drm_fb_helper_unprepare(fb_helper); + kfree(fb_helper); + } +} + +static int drm_fbdev_client_restore(struct drm_client_dev *client) +{ + drm_fb_helper_lastclose(client->dev); + + return 0; +} + +static int drm_fbdev_client_hotplug(struct drm_client_dev *client) +{ + struct drm_fb_helper *fb_helper = drm_fb_helper_from_client(client); + struct drm_device *dev = client->dev; + int ret; + + if (dev->fb_helper) + return drm_fb_helper_hotplug_event(dev->fb_helper); + + ret = drm_fb_helper_init(dev, fb_helper); + if (ret) + goto err_drm_err; + + if (!drm_drv_uses_atomic_modeset(dev)) + drm_helper_disable_unused_functions(dev); + + ret = drm_fb_helper_initial_config(fb_helper); + if (ret) + goto err_drm_fb_helper_fini; + + return 0; + +err_drm_fb_helper_fini: + drm_fb_helper_fini(fb_helper); +err_drm_err: + drm_err(dev, "fbdev: Failed to setup emulation (ret=%d)\n", ret); + return ret; +} + +static int drm_fbdev_client_suspend(struct drm_client_dev *client, bool holds_console_lock) +{ + struct drm_fb_helper *fb_helper = drm_fb_helper_from_client(client); + + if (holds_console_lock) + drm_fb_helper_set_suspend(fb_helper, true); + else + drm_fb_helper_set_suspend_unlocked(fb_helper, true); + + return 0; +} + +static int drm_fbdev_client_resume(struct drm_client_dev *client, bool holds_console_lock) +{ + struct drm_fb_helper *fb_helper = drm_fb_helper_from_client(client); + + if (holds_console_lock) + drm_fb_helper_set_suspend(fb_helper, false); + else + drm_fb_helper_set_suspend_unlocked(fb_helper, false); + + return 0; +} + +static const struct drm_client_funcs drm_fbdev_client_funcs = { + .owner = THIS_MODULE, + .unregister = drm_fbdev_client_unregister, + .restore = drm_fbdev_client_restore, + .hotplug = drm_fbdev_client_hotplug, + .suspend = drm_fbdev_client_suspend, + .resume = drm_fbdev_client_resume, +}; + +/** + * drm_fbdev_client_setup() - Setup fbdev emulation + * @dev: DRM device + * @format: Preferred color format for the device. DRM_FORMAT_XRGB8888 + * is used if this is zero. + * + * This function sets up fbdev emulation. Restore, hotplug events and + * teardown are all taken care of. Drivers that do suspend/resume need + * to call drm_client_dev_suspend() and drm_client_dev_resume() by + * themselves. Simple drivers might use drm_mode_config_helper_suspend(). + * + * This function is safe to call even when there are no connectors present. + * Setup will be retried on the next hotplug event. + * + * The fbdev client is destroyed by drm_dev_unregister(). + * + * Returns: + * 0 on success, or a negative errno code otherwise. + */ +int drm_fbdev_client_setup(struct drm_device *dev, const struct drm_format_info *format) +{ + struct drm_fb_helper *fb_helper; + unsigned int color_mode; + int ret; + + /* TODO: Use format info throughout DRM */ + if (format) { + unsigned int bpp = drm_format_info_bpp(format, 0); + + switch (bpp) { + case 16: + color_mode = format->depth; // could also be 15 + break; + default: + color_mode = bpp; + } + } else { + switch (dev->mode_config.preferred_depth) { + case 0: + case 24: + color_mode = 32; + break; + default: + color_mode = dev->mode_config.preferred_depth; + } + } + + drm_WARN(dev, !dev->registered, "Device has not been registered.\n"); + drm_WARN(dev, dev->fb_helper, "fb_helper is already set!\n"); + + fb_helper = kzalloc(sizeof(*fb_helper), GFP_KERNEL); + if (!fb_helper) + return -ENOMEM; + drm_fb_helper_prepare(dev, fb_helper, color_mode, NULL); + + ret = drm_client_init(dev, &fb_helper->client, "fbdev", &drm_fbdev_client_funcs); + if (ret) { + drm_err(dev, "Failed to register client: %d\n", ret); + goto err_drm_client_init; + } + + drm_client_register(&fb_helper->client); + + return 0; + +err_drm_client_init: + drm_fb_helper_unprepare(fb_helper); + kfree(fb_helper); + return ret; +} diff --git a/drivers/gpu/drm/clients/drm_log.c b/drivers/gpu/drm/clients/drm_log.c new file mode 100644 index 000000000000..379850c83e51 --- /dev/null +++ b/drivers/gpu/drm/clients/drm_log.c @@ -0,0 +1,420 @@ +// SPDX-License-Identifier: GPL-2.0 or MIT +/* + * Copyright (c) 2024 Red Hat. + * Author: Jocelyn Falempe <jfalempe@redhat.com> + */ + +#include <linux/console.h> +#include <linux/font.h> +#include <linux/init.h> +#include <linux/iosys-map.h> +#include <linux/module.h> +#include <linux/types.h> + +#include <drm/drm_client.h> +#include <drm/drm_drv.h> +#include <drm/drm_fourcc.h> +#include <drm/drm_framebuffer.h> +#include <drm/drm_print.h> + +#include "drm_client_internal.h" +#include "drm_draw_internal.h" +#include "drm_internal.h" + +MODULE_AUTHOR("Jocelyn Falempe"); +MODULE_DESCRIPTION("DRM boot logger"); +MODULE_LICENSE("GPL"); + +static unsigned int scale = 1; +module_param(scale, uint, 0444); +MODULE_PARM_DESC(scale, "Integer scaling factor for drm_log, default is 1"); + +/** + * DOC: overview + * + * This is a simple graphic logger, to print the kernel message on screen, until + * a userspace application is able to take over. + * It is only for debugging purpose. + */ + +struct drm_log_scanout { + struct drm_client_buffer *buffer; + const struct font_desc *font; + u32 rows; + u32 columns; + u32 scaled_font_h; + u32 scaled_font_w; + u32 line; + u32 format; + u32 px_width; + u32 front_color; + u32 prefix_color; +}; + +struct drm_log { + struct mutex lock; + struct drm_client_dev client; + struct console con; + bool probed; + u32 n_scanout; + struct drm_log_scanout *scanout; +}; + +static struct drm_log *client_to_drm_log(struct drm_client_dev *client) +{ + return container_of(client, struct drm_log, client); +} + +static struct drm_log *console_to_drm_log(struct console *con) +{ + return container_of(con, struct drm_log, con); +} + +static void drm_log_blit(struct iosys_map *dst, unsigned int dst_pitch, + const u8 *src, unsigned int src_pitch, + u32 height, u32 width, u32 px_width, u32 color) +{ + switch (px_width) { + case 2: + drm_draw_blit16(dst, dst_pitch, src, src_pitch, height, width, scale, color); + break; + case 3: + drm_draw_blit24(dst, dst_pitch, src, src_pitch, height, width, scale, color); + break; + case 4: + drm_draw_blit32(dst, dst_pitch, src, src_pitch, height, width, scale, color); + break; + default: + WARN_ONCE(1, "Can't blit with pixel width %d\n", px_width); + } +} + +static void drm_log_clear_line(struct drm_log_scanout *scanout, u32 line) +{ + struct drm_framebuffer *fb = scanout->buffer->fb; + unsigned long height = scanout->scaled_font_h; + struct iosys_map map; + struct drm_rect r = DRM_RECT_INIT(0, line * height, fb->width, height); + + if (drm_client_buffer_vmap_local(scanout->buffer, &map)) + return; + iosys_map_memset(&map, r.y1 * fb->pitches[0], 0, height * fb->pitches[0]); + drm_client_buffer_vunmap_local(scanout->buffer); + drm_client_framebuffer_flush(scanout->buffer, &r); +} + +static void drm_log_draw_line(struct drm_log_scanout *scanout, const char *s, + unsigned int len, unsigned int prefix_len) +{ + struct drm_framebuffer *fb = scanout->buffer->fb; + struct iosys_map map; + const struct font_desc *font = scanout->font; + size_t font_pitch = DIV_ROUND_UP(font->width, 8); + const u8 *src; + u32 px_width = fb->format->cpp[0]; + struct drm_rect r = DRM_RECT_INIT(0, scanout->line * scanout->scaled_font_h, + fb->width, (scanout->line + 1) * scanout->scaled_font_h); + u32 i; + + if (drm_client_buffer_vmap_local(scanout->buffer, &map)) + return; + + iosys_map_incr(&map, r.y1 * fb->pitches[0]); + for (i = 0; i < len && i < scanout->columns; i++) { + u32 color = (i < prefix_len) ? scanout->prefix_color : scanout->front_color; + src = drm_draw_get_char_bitmap(font, s[i], font_pitch); + drm_log_blit(&map, fb->pitches[0], src, font_pitch, + scanout->scaled_font_h, scanout->scaled_font_w, + px_width, color); + iosys_map_incr(&map, scanout->scaled_font_w * px_width); + } + + scanout->line++; + if (scanout->line >= scanout->rows) + scanout->line = 0; + drm_client_buffer_vunmap_local(scanout->buffer); + drm_client_framebuffer_flush(scanout->buffer, &r); +} + +static void drm_log_draw_new_line(struct drm_log_scanout *scanout, + const char *s, unsigned int len, unsigned int prefix_len) +{ + if (scanout->line == 0) { + drm_log_clear_line(scanout, 0); + drm_log_clear_line(scanout, 1); + drm_log_clear_line(scanout, 2); + } else if (scanout->line + 2 < scanout->rows) + drm_log_clear_line(scanout, scanout->line + 2); + + drm_log_draw_line(scanout, s, len, prefix_len); +} + +/* + * Depends on print_time() in printk.c + * Timestamp is written with "[%5lu.%06lu]" + */ +#define TS_PREFIX_LEN 13 + +static void drm_log_draw_kmsg_record(struct drm_log_scanout *scanout, + const char *s, unsigned int len) +{ + u32 prefix_len = 0; + + if (len > TS_PREFIX_LEN && s[0] == '[' && s[6] == '.' && s[TS_PREFIX_LEN] == ']') + prefix_len = TS_PREFIX_LEN + 1; + + /* do not print the ending \n character */ + if (s[len - 1] == '\n') + len--; + + while (len > scanout->columns) { + drm_log_draw_new_line(scanout, s, scanout->columns, prefix_len); + s += scanout->columns; + len -= scanout->columns; + prefix_len = 0; + } + if (len) + drm_log_draw_new_line(scanout, s, len, prefix_len); +} + +static u32 drm_log_find_usable_format(struct drm_plane *plane) +{ + int i; + + for (i = 0; i < plane->format_count; i++) + if (drm_draw_color_from_xrgb8888(0xffffff, plane->format_types[i]) != 0) + return plane->format_types[i]; + return DRM_FORMAT_INVALID; +} + +static int drm_log_setup_modeset(struct drm_client_dev *client, + struct drm_mode_set *mode_set, + struct drm_log_scanout *scanout) +{ + struct drm_crtc *crtc = mode_set->crtc; + u32 width = mode_set->mode->hdisplay; + u32 height = mode_set->mode->vdisplay; + u32 format; + + scanout->font = get_default_font(width, height, NULL, NULL); + if (!scanout->font) + return -ENOENT; + + format = drm_log_find_usable_format(crtc->primary); + if (format == DRM_FORMAT_INVALID) + return -EINVAL; + + scanout->buffer = drm_client_framebuffer_create(client, width, height, format); + if (IS_ERR(scanout->buffer)) { + drm_warn(client->dev, "drm_log can't create framebuffer %d %d %p4cc\n", + width, height, &format); + return -ENOMEM; + } + mode_set->fb = scanout->buffer->fb; + scanout->scaled_font_h = scanout->font->height * scale; + scanout->scaled_font_w = scanout->font->width * scale; + scanout->rows = height / scanout->scaled_font_h; + scanout->columns = width / scanout->scaled_font_w; + scanout->front_color = drm_draw_color_from_xrgb8888(0xffffff, format); + scanout->prefix_color = drm_draw_color_from_xrgb8888(0x4e9a06, format); + return 0; +} + +static int drm_log_count_modeset(struct drm_client_dev *client) +{ + struct drm_mode_set *mode_set; + int count = 0; + + mutex_lock(&client->modeset_mutex); + drm_client_for_each_modeset(mode_set, client) + count++; + mutex_unlock(&client->modeset_mutex); + return count; +} + +static void drm_log_init_client(struct drm_log *dlog) +{ + struct drm_client_dev *client = &dlog->client; + struct drm_mode_set *mode_set; + int i, max_modeset; + int n_modeset = 0; + + dlog->probed = true; + + if (drm_client_modeset_probe(client, 0, 0)) + return; + + max_modeset = drm_log_count_modeset(client); + if (!max_modeset) + return; + + dlog->scanout = kcalloc(max_modeset, sizeof(*dlog->scanout), GFP_KERNEL); + if (!dlog->scanout) + return; + + mutex_lock(&client->modeset_mutex); + drm_client_for_each_modeset(mode_set, client) { + if (!mode_set->mode) + continue; + if (drm_log_setup_modeset(client, mode_set, &dlog->scanout[n_modeset])) + continue; + n_modeset++; + } + mutex_unlock(&client->modeset_mutex); + if (n_modeset == 0) + goto err_nomodeset; + + if (drm_client_modeset_commit(client)) + goto err_failed_commit; + + dlog->n_scanout = n_modeset; + return; + +err_failed_commit: + for (i = 0; i < n_modeset; i++) + drm_client_framebuffer_delete(dlog->scanout[i].buffer); + +err_nomodeset: + kfree(dlog->scanout); + dlog->scanout = NULL; +} + +static void drm_log_free_scanout(struct drm_client_dev *client) +{ + struct drm_log *dlog = client_to_drm_log(client); + int i; + + if (dlog->n_scanout) { + for (i = 0; i < dlog->n_scanout; i++) + drm_client_framebuffer_delete(dlog->scanout[i].buffer); + dlog->n_scanout = 0; + kfree(dlog->scanout); + dlog->scanout = NULL; + } +} + +static void drm_log_client_unregister(struct drm_client_dev *client) +{ + struct drm_log *dlog = client_to_drm_log(client); + struct drm_device *dev = client->dev; + + unregister_console(&dlog->con); + + mutex_lock(&dlog->lock); + drm_log_free_scanout(client); + drm_client_release(client); + mutex_unlock(&dlog->lock); + kfree(dlog); + drm_dbg(dev, "Unregistered with drm log\n"); +} + +static int drm_log_client_hotplug(struct drm_client_dev *client) +{ + struct drm_log *dlog = client_to_drm_log(client); + + mutex_lock(&dlog->lock); + drm_log_free_scanout(client); + dlog->probed = false; + mutex_unlock(&dlog->lock); + return 0; +} + +static int drm_log_client_suspend(struct drm_client_dev *client, bool _console_lock) +{ + struct drm_log *dlog = client_to_drm_log(client); + + console_stop(&dlog->con); + + return 0; +} + +static int drm_log_client_resume(struct drm_client_dev *client, bool _console_lock) +{ + struct drm_log *dlog = client_to_drm_log(client); + + console_start(&dlog->con); + + return 0; +} + +static const struct drm_client_funcs drm_log_client_funcs = { + .owner = THIS_MODULE, + .unregister = drm_log_client_unregister, + .hotplug = drm_log_client_hotplug, + .suspend = drm_log_client_suspend, + .resume = drm_log_client_resume, +}; + +static void drm_log_write_thread(struct console *con, struct nbcon_write_context *wctxt) +{ + struct drm_log *dlog = console_to_drm_log(con); + int i; + + if (!dlog->probed) + drm_log_init_client(dlog); + + /* Check that we are still the master before drawing */ + if (drm_master_internal_acquire(dlog->client.dev)) { + drm_master_internal_release(dlog->client.dev); + + for (i = 0; i < dlog->n_scanout; i++) + drm_log_draw_kmsg_record(&dlog->scanout[i], wctxt->outbuf, wctxt->len); + } +} + +static void drm_log_lock(struct console *con, unsigned long *flags) +{ + struct drm_log *dlog = console_to_drm_log(con); + + mutex_lock(&dlog->lock); + migrate_disable(); +} + +static void drm_log_unlock(struct console *con, unsigned long flags) +{ + struct drm_log *dlog = console_to_drm_log(con); + + migrate_enable(); + mutex_unlock(&dlog->lock); +} + +static void drm_log_register_console(struct console *con) +{ + strscpy(con->name, "drm_log"); + con->write_thread = drm_log_write_thread; + con->device_lock = drm_log_lock; + con->device_unlock = drm_log_unlock; + con->flags = CON_PRINTBUFFER | CON_NBCON; + con->index = -1; + + register_console(con); +} + +/** + * drm_log_register() - Register a drm device to drm_log + * @dev: the drm device to register. + */ +void drm_log_register(struct drm_device *dev) +{ + struct drm_log *new; + + new = kzalloc(sizeof(*new), GFP_KERNEL); + if (!new) + goto err_warn; + + mutex_init(&new->lock); + if (drm_client_init(dev, &new->client, "drm_log", &drm_log_client_funcs)) + goto err_free; + + drm_client_register(&new->client); + + drm_log_register_console(&new->con); + + drm_dbg(dev, "Registered with drm log as %s\n", new->con.name); + return; + +err_free: + kfree(new); +err_warn: + drm_warn(dev, "Failed to register with drm log\n"); +} |