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fbdev: fbmem: add a helper to determine if an aperture is used by a fw fb 

Add a function for drivers to check if the a firmware initialized
fb is corresponds to their aperture.  This allows drivers to check if the
device corresponds to what the firmware set up as the display device.

Bug: https://bugzilla.kernel.org/show_bug.cgi?id=215203
Bug: https://gitlab.freedesktop.org/drm/amd/-/issues/1840
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Alex Deucher 2021-12-22 22:41:18 -05:00
parent eaa090538e
commit 9a45ac2320
2 changed files with 48 additions and 0 deletions
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47
drivers/video/fbdev/core/fbmem.c
View File

@ -1762,6 +1762,53 @@ int remove_conflicting_framebuffers(struct apertures_struct *a,
}
EXPORT_SYMBOL(remove_conflicting_framebuffers);
/**
* is_firmware_framebuffer - detect if firmware-configured framebuffer matches
* @a: memory range, users of which are to be checked
*
* This function checks framebuffer devices (initialized by firmware/bootloader)
* which use memory range described by @a. If @a matchesm the function returns
* true, otherwise false.
*/
bool is_firmware_framebuffer(struct apertures_struct *a)
{
bool do_free = false;
bool found = false;
int i;
if (!a) {
a = alloc_apertures(1);
if (!a)
return false;
a->ranges[0].base = 0;
a->ranges[0].size = ~0;
do_free = true;
}
mutex_lock(&registration_lock);
/* check all firmware fbs and kick off if the base addr overlaps */
for_each_registered_fb(i) {
struct apertures_struct *gen_aper;
if (!(registered_fb[i]->flags & FBINFO_MISC_FIRMWARE))
continue;
gen_aper = registered_fb[i]->apertures;
if (fb_do_apertures_overlap(gen_aper, a)) {
found = true;
break;
}
}
mutex_unlock(&registration_lock);
if (do_free)
kfree(a);
return found;
}
EXPORT_SYMBOL(is_firmware_framebuffer);
/**
* remove_conflicting_pci_framebuffers - remove firmware-configured framebuffers for PCI devices
* @pdev: PCI device

1
include/linux/fb.h
View File

@ -610,6 +610,7 @@ extern int remove_conflicting_pci_framebuffers(struct pci_dev *pdev,
const char *name);
extern int remove_conflicting_framebuffers(struct apertures_struct *a,
const char *name, bool primary);
extern bool is_firmware_framebuffer(struct apertures_struct *a);
extern int fb_prepare_logo(struct fb_info *fb_info, int rotate);
extern int fb_show_logo(struct fb_info *fb_info, int rotate);
extern char* fb_get_buffer_offset(struct fb_info *info, struct fb_pixmap *buf, u32 size);