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drm/fb-helper: Consolidate CONFIG_DRM_FBDEV_LEAK_PHYS_SMEM

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Consolidate all handling of CONFIG_DRM_FBDEV_LEAK_PHYS_SMEM by
making the module parameter optional in drm_fb_helper.c.

Without the config option, modules can set smem_start in struct
fb_info for internal usage, but not export if to userspace. The
address can only be exported by enabling the option and setting
the module parameter. Also update the comment.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Acked-by: Zack Rusin <zackr@vmware.com>
Tested-by: Sui Jingfeng<suijingfeng@loongson.cn>
Link: https://patchwork.freedesktop.org/patch/msgid/20230320150751.20399-8-tzimmermann@suse.de
This commit is contained in:
Thomas Zimmermann
2023-03-20 16:07:50 +01:00
parent 61b5d0072a
commit a51c7663f1
3 changed files with 9 additions and 31 deletions
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9
drivers/gpu/drm/drm_fbdev_dma.c
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@@ -136,16 +136,9 @@ static int drm_fbdev_dma_helper_fb_probe(struct drm_fb_helper *fb_helper,
info->flags |= FBINFO_READS_FAST; /* signal caching */
info->screen_size = sizes->surface_height * fb->pitches[0];
info->screen_buffer = map.vaddr;
info->fix.smem_start = page_to_phys(virt_to_page(info->screen_buffer));
info->fix.smem_len = info->screen_size;
#if IS_ENABLED(CONFIG_DRM_FBDEV_LEAK_PHYS_SMEM)
/*
* Shamelessly leak the physical address to user-space.
*/
if (fb_helper->hint_leak_smem_start && !info->fix.smem_start)
info->fix.smem_start = page_to_phys(virt_to_page(info->screen_buffer));
#endif
return 0;
err_drm_client_buffer_vunmap: