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Currently, drm_gem_fb_create() doesn't check if the pixel format is supported, which can lead to the acceptance of invalid pixel formats e.g. the acceptance of invalid modifiers. Therefore, add a check for valid formats on drm_gem_fb_create(). Note that this check is only valid for atomic drivers, because, for non-atomic drivers, checking drm_any_plane_has_format() is not possible since the format list for the primary plane is fake, and we'd therefore reject valid formats. Adding this check to drm_gem_fb_create() will guarantee that the igt@kms_addfb_basic@addfb25-bad-modifier IGT test passes for drivers using this callback. This commit is a recapture of a series sent a while ago. Initially, I sent a patch [1] similar to this one in which I introduced the format check to drm_gem_fb_create(). Based on the feedback on the patch, I placed the check inside framebuffer_check() [2] so that it wouldn't be needed to hit any driver-specific code path when the check fails. Therefore, we could remove the check from the specific drivers (i915, amdgpu, and vmwgfx). But, with some new feedback, it was shown that introducing this check inside framebuffer_check() is problematic for the i915 driver [3]. For the i915 driver, in the legacy case, in which we don't get the modifier from the userspace, i915's fb_create hook computes the right modifier, which isn't necessarily linear. Therefore, if we check the modifier before that point, we might get wrong answers. So, I kept the check inside the i915 driver and removed the check from amdgpu and vmwgfx [4]. But, this yet hasn't solved the i915 problem [5]. As we cannot add the check inside framebuffer_check() without affecting the i915 behavior, this commit went back to the original patch. This way we can guarantee a more uniform behavior from the drivers that use the drm_gem_fb_create() callback. [1] https://lore.kernel.org/dri-devel/20230103125322.855089-1-mcanal@igalia.com/T/ [2] https://lore.kernel.org/dri-devel/20230109105807.18172-1-mcanal@igalia.com/T/ [3] https://lore.kernel.org/dri-devel/Y8AAdW2y7zN7DCUZ@intel.com/ [4] https://lore.kernel.org/dri-devel/20230113112743.188486-1-mcanal@igalia.com/T/ [5] https://lore.kernel.org/dri-devel/Y8FXWvEhO7GCRKVJ@intel.com/ Signed-off-by: Maíra Canal <mcanal@igalia.com> Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch> Signed-off-by: Maíra Canal <mairacanal@riseup.net> Link: https://patchwork.freedesktop.org/patch/msgid/20230412142923.136707-1-mcanal@igalia.com |
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.