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drm: vkms: Alloc the compose frame using vzalloc

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Currently, the memory to the composition frame is being allocated using
the kzmalloc. This comes with the limitation of maximum size of one
page size(which in the x86_64 is 4Kb and 4MB for default and hugepage
respectively).

Somes test of igt (e.g. kms_plane@pixel-format) uses more than 4MB when
testing some pixel formats like ARGB16161616 and the following error were
showing up when running kms_plane@plane-panning-bottom-right*:

[drm:vkms_composer_worker [vkms]] *ERROR* Cannot allocate memory for
output frame.

This problem is addessed by allocating the memory using kvzalloc that
circunvents this limitation.

V5: Improve the commit message and drop the debugging issues in VKMS
TO-DO(Melissa Wen).

Reviewed-by: Melissa Wen <mwen@igalia.com>
Signed-off-by: Igor Torrente <igormtorrente@gmail.com>
Signed-off-by: Melissa Wen <melissa.srw@gmail.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220404204515.42144-2-igormtorrente@gmail.com
This commit is contained in:
Igor Torrente 2022-04-04 17:45:07 -03:00 committed by Melissa Wen
parent 24f6fe3226
commit 16490922a9
2 changed files with 3 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
Documentation/gpu/vkms.rst
View File

@ -102,12 +102,6 @@ Debugging:
- kms_plane: some test cases are failing due to timeout on capturing CRC;
- kms_flip: when running test cases in sequence, some successful individual
test cases are failing randomly; when individually, some successful test
cases display in the log the following error::
[drm:vkms_prepare_fb [vkms]] ERROR vmap failed: -4
Virtual hardware (vblank-less) mode:
- VKMS already has support for vblanks simulated via hrtimers, which can be

6
drivers/gpu/drm/vkms/vkms_composer.c
View File

@ -180,7 +180,7 @@ static int compose_active_planes(void **vaddr_out,
int i;
if (!*vaddr_out) {
*vaddr_out = kzalloc(gem_obj->size, GFP_KERNEL);
*vaddr_out = kvzalloc(gem_obj->size, GFP_KERNEL);
if (!*vaddr_out) {
DRM_ERROR("Cannot allocate memory for output frame.");
return -ENOMEM;
@ -263,7 +263,7 @@ void vkms_composer_worker(struct work_struct *work)
crtc_state);
if (ret) {
if (ret == -EINVAL && !wb_pending)
kfree(vaddr_out);
kvfree(vaddr_out);
return;
}
@ -275,7 +275,7 @@ void vkms_composer_worker(struct work_struct *work)
crtc_state->wb_pending = false;
spin_unlock_irq(&out->composer_lock);
} else {
kfree(vaddr_out);
kvfree(vaddr_out);
}
/*