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drm/bochs: Validate display modes against available video memory

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For each mode, test the required memory against the available video
memory. Filters out modes that do not fit into display memory.

Also remove the old test against the 4 MiB limit. It is now obsolete
and did not necessarily produce correct results.

v2:
- fix __udivdi3 linker error (kernel test robot)
- fix vdisplay and hdisplay usage

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Acked-by: Gerd Hoffmann <kraxel@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240902105546.792625-10-tzimmermann@suse.de
This commit is contained in:
Thomas Zimmermann
2024-09-02 12:53:47 +02:00
parent c3ac343c14
commit 4dc9bb66eb
1 changed files with 20 additions and 7 deletions
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27
drivers/gpu/drm/tiny/bochs.c
View File

@@ -558,8 +558,28 @@ static const struct drm_connector_funcs bochs_connector_funcs = {
.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
};
static enum drm_mode_status bochs_mode_config_mode_valid(struct drm_device *dev,
const struct drm_display_mode *mode)
{
struct bochs_device *bochs = to_bochs_device(dev);
const struct drm_format_info *format = drm_format_info(DRM_FORMAT_XRGB8888);
u64 pitch;
if (drm_WARN_ON(dev, !format))
return MODE_ERROR;
pitch = drm_format_info_min_pitch(format, 0, mode->hdisplay);
if (!pitch)
return MODE_BAD_WIDTH;
if (mode->vdisplay > DIV_ROUND_DOWN_ULL(bochs->fb_size, pitch))
return MODE_MEM;
return MODE_OK;
}
static const struct drm_mode_config_funcs bochs_mode_config_funcs = {
.fb_create = drm_gem_fb_create_with_dirty,
.mode_valid = bochs_mode_config_mode_valid,
.atomic_check = drm_atomic_helper_check,
.atomic_commit = drm_atomic_helper_commit,
};
@@ -687,15 +707,8 @@ static int bochs_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent
{
struct bochs_device *bochs;
struct drm_device *dev;
unsigned long fbsize;
int ret;
fbsize = pci_resource_len(pdev, 0);
if (fbsize < 4 * 1024 * 1024) {
DRM_ERROR("less than 4 MB video memory, ignoring device\n");
return -ENOMEM;
}
ret = drm_aperture_remove_conflicting_pci_framebuffers(pdev, &bochs_driver);
if (ret)
return ret;