On Thu, Jul 30, 2020 at 10:26:17AM -0700, James Jones wrote:
Accept the DRM_FORMAT_MOD_NVIDIA_16BX2_BLOCK() family of modifiers to handle broken userspace Xorg modesetting and Mesa drivers. Existing Mesa drivers are still aware of only these older format modifiers which do not differentiate between different variations of the block linear layout. When the format modifier support flag was flipped in the nouveau kernel driver, the X.org modesetting driver began attempting to use its format modifier-enabled framebuffer path. Because the set of format modifiers advertised by the kernel prior to this change do not intersect with the set of format modifiers advertised by Mesa, allocating GBM buffers using format modifiers fails and the modesetting driver falls back to non-modifier allocation. However, it still later queries the modifier of the GBM buffer when creating its DRM-KMS framebuffer object, receives the old-format modifier from Mesa, and attempts to create a framebuffer with it. Since the kernel is still not aware of these formats, this fails.
Userspace should not be attempting to query format modifiers of GBM buffers allocated with a non- format-modifier-aware allocation path, but to avoid breaking existing userspace behavior, this change accepts the old-style format modifiers when creating framebuffers and applying them to planes by translating them to the equivalent new-style modifier. To accomplish this, some layout parameters must be assumed to match properties of the device targeted by the relevant ioctls. To avoid perpetuating misuse of the old-style modifiers, this change does not advertise support for them. Doing so would imply compatibility between devices with incompatible memory layouts.
Tested with Xorg 1.20 modesetting driver, weston@c46c70dac84a4b3030cd05b380f9f410536690fc, gnome & KDE wayland desktops from Ubuntu 18.04, kmscube hacked to use linear mod, and sway 1.5
Reported-by: Kirill A. Shutemov kirill@shutemov.name Fixes: fa4f4c213f5f ("drm/nouveau/kms: Support NVIDIA format modifiers") Link: https://lkml.org/lkml/2020/6/30/1251 Signed-off-by: James Jones jajones@nvidia.com
drivers/gpu/drm/nouveau/nouveau_display.c | 26 +++++++++++++++++++++-- 1 file changed, 24 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/nouveau/nouveau_display.c b/drivers/gpu/drm/nouveau/nouveau_display.c index 496c4621cc78..31543086254b 100644 --- a/drivers/gpu/drm/nouveau/nouveau_display.c +++ b/drivers/gpu/drm/nouveau/nouveau_display.c @@ -191,8 +191,14 @@ nouveau_decode_mod(struct nouveau_drm *drm, uint32_t *tile_mode, uint8_t *kind) {
struct nouveau_display *disp = nouveau_display(drm->dev); BUG_ON(!tile_mode || !kind);
if ((modifier & (0xffull << 12)) == 0ull) {
/* Legacy modifier. Translate to this device's 'kind.' */modifier |= disp->format_modifiers[0] & (0xffull << 12);}
if (modifier == DRM_FORMAT_MOD_LINEAR) { /* tile_mode will not be used in this case */ *tile_mode = 0;
Em. I thought Ben's suggestion was to move it under != MOD_LINEAR. I don't see it here.