Since "drm/fb: Stop leaking physical address", the default behaviour of the DRM fbdev emulation is to set the smem_base to 0 and pass the new FBINFO_HIDE_SMEM_START flag.

The main reason is to avoid leaking physical addresse to user-space, and it follows a general move over the kernel code to avoid user-space to manipulate physical addresses and then use some other mechanisms like dma-buf to transfer physical buffer handles over multiple subsystems.

But, a lot of devices depends on closed sources binaries to enable OpenGL hardware acceleration that uses this smem_start value to pass physical addresses to out-of-tree modules in order to render into these physical adresses. These should use dma-buf buffers allocated from the DRM display device instead and stop relying on fbdev overallocation to gather DMA memory (some HW vendors delivers GBM and Wayland capable binaries, but older unsupported devices won't have these new binaries and are doomed until an Open Source solution like Lima finalizes).

Since these devices heavily depends on this kind of software and because the smem_start population was available for years, it's a breakage to stop leaking smem_start without any alternative solutions.

This patch adds a Kconfig depending on the EXPERT config and an unsafe kernel module parameter tainting the kernel when enabled.

A clear comment and Kconfig help text was added to clarify why and when this patch should be reverted, but in the meantime it's a necessary feature to keep.

Cc: Dave Airlie airlied@gmail.com Cc: Daniel Vetter daniel.vetter@ffwll.ch Cc: Bartlomiej Zolnierkiewicz b.zolnierkie@samsung.com Cc: Noralf Trønnes noralf@tronnes.org Cc: Maxime Ripard maxime.ripard@bootlin.com Cc: Eric Anholt eric@anholt.net Cc: Lucas Stach l.stach@pengutronix.de Cc: Rob Clark robdclark@gmail.com Cc: Ben Skeggs skeggsb@gmail.com Cc: Christian König christian.koenig@amd.com Signed-off-by: Neil Armstrong narmstrong@baylibre.com Reviewed-by: Maxime Ripard maxime.ripard@bootlin.com Tested-by: Maxime Ripard maxime.ripard@bootlin.com Acked-by: Daniel Vetter daniel.vetter@ffwll.ch --- drivers/gpu/drm/Kconfig | 20 ++++++++++++++++++++ drivers/gpu/drm/drm_fb_helper.c | 33 +++++++++++++++++++++++++++++++-- 2 files changed, 51 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig index 8871b3f..0b4067f 100644 --- a/drivers/gpu/drm/Kconfig +++ b/drivers/gpu/drm/Kconfig @@ -110,6 +110,26 @@ config DRM_FBDEV_OVERALLOC 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 an 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_LOAD_EDID_FIRMWARE bool "Allow to specify an EDID data set instead of probing for it" depends on DRM diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c index bf2190c..61a0d2b 100644 --- a/drivers/gpu/drm/drm_fb_helper.c +++ b/drivers/gpu/drm/drm_fb_helper.c @@ -56,6 +56,25 @@ MODULE_PARM_DESC(drm_fbdev_overalloc, "Overallocation of the fbdev buffer (%) [default=" __MODULE_STRING(CONFIG_DRM_FBDEV_OVERALLOC) "]");

+/* + * 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 is a bad habit essentially kept into closed source opengl driver + * that should really be moved into open-source upstream projects instead + * of using legacy physical addresses in user space to communicate with + * other out-of-tree kernel modules. + * + * This module_param *should* be removed as soon as possible and be + * considered as a broken and legacy behaviour from a modern fbdev device. + */ +#if IS_ENABLED(CONFIG_DRM_FBDEV_LEAK_PHYS_SMEM) +static bool drm_leak_fbdev_smem = false; +module_param_unsafe(drm_leak_fbdev_smem, bool, 0600); +MODULE_PARM_DESC(fbdev_emulation, + "Allow unsafe leaking fbdev physical smem address [default=false]"); +#endif + static LIST_HEAD(kernel_fb_helper_list); static DEFINE_MUTEX(kernel_fb_helper_lock);

@@ -2673,8 +2692,12 @@ __drm_fb_helper_initial_config_and_unlock(struct drm_fb_helper *fb_helper,

info = fb_helper->fbdev; info->var.pixclock = 0; - /* don't leak any physical addresses to userspace */ - info->flags |= FBINFO_HIDE_SMEM_START; + /* Shamelessly allow physical address leaking to userspace */ +#if IS_ENABLED(CONFIG_DRM_FBDEV_LEAK_PHYS_SMEM) + if (!drm_leak_fbdev_smem) +#endif + /* don't leak any physical addresses to userspace */ + info->flags |= FBINFO_HIDE_SMEM_START;

/* Need to drop locks to avoid recursive deadlock in * register_framebuffer. This is ok because the only thing left to do is @@ -3084,6 +3107,12 @@ int drm_fb_helper_generic_probe(struct drm_fb_helper *fb_helper, fbi->screen_size = fb->height * fb->pitches[0]; fbi->fix.smem_len = fbi->screen_size; fbi->screen_buffer = buffer->vaddr; + /* Shamelessly leak the physical address to user-space */ +#if IS_ENABLED(CONFIG_DRM_FBDEV_LEAK_PHYS_SMEM) + if (drm_leak_fbdev_smem && fbi->fix.smem_start == 0) + fbi->fix.smem_start = + page_to_phys(virt_to_page(fbi->screen_buffer)); +#endif strcpy(fbi->fix.id, "DRM emulated");

drm_fb_helper_fill_fix(fbi, fb->pitches[0], fb->format->depth);