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hyperv: avoid dependency on screen_info

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The two hyperv framebuffer drivers (hyperv_fb or hyperv_drm_drv) access the
global screen_info in order to take over from the sysfb framebuffer, which
in turn could be handled by simplefb, simpledrm or efifb. Similarly, the
vmbus_drv code marks the original EFI framebuffer as reserved, but this
is not required if there is no sysfb.

As a preparation for making screen_info itself more local to the sysfb
helper code, add a compile-time conditional in all three files that relate
to hyperv fb and just skip this code if there is no sysfb that needs to
be unregistered.

Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Acked-by: Helge Deller <deller@gmx.de>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Link: https://lore.kernel.org/r/20231009211845.3136536-9-arnd@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Arnd Bergmann 2023-10-09 23:18:44 +02:00 committed by Greg Kroah-Hartman
parent b858a97bf0
commit a07b50d80a
3 changed files with 12 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
drivers/gpu/drm/hyperv/hyperv_drm_drv.c
View File

@ -73,9 +73,10 @@ static int hyperv_setup_vram(struct hyperv_drm_device *hv,
struct drm_device *dev = &hv->dev;
int ret;
drm_aperture_remove_conflicting_framebuffers(screen_info.lfb_base,
screen_info.lfb_size,
&hyperv_driver);
if (IS_ENABLED(CONFIG_SYSFB))
drm_aperture_remove_conflicting_framebuffers(screen_info.lfb_base,
screen_info.lfb_size,
&hyperv_driver);
hv->fb_size = (unsigned long)hv->mmio_megabytes * 1024 * 1024;

6
drivers/hv/vmbus_drv.c
View File

@ -2100,8 +2100,10 @@ static void __maybe_unused vmbus_reserve_fb(void)
if (efi_enabled(EFI_BOOT)) {
/* Gen2 VM: get FB base from EFI framebuffer */
start = screen_info.lfb_base;
size = max_t(__u32, screen_info.lfb_size, 0x800000);
if (IS_ENABLED(CONFIG_SYSFB)) {
start = screen_info.lfb_base;
size = max_t(__u32, screen_info.lfb_size, 0x800000);
}
} else {
/* Gen1 VM: get FB base from PCI */
pdev = pci_get_device(PCI_VENDOR_ID_MICROSOFT,

8
drivers/video/fbdev/hyperv_fb.c
View File

@ -1030,7 +1030,7 @@ static int hvfb_getmem(struct hv_device *hdev, struct fb_info *info)
goto getmem_done;
}
pr_info("Unable to allocate enough contiguous physical memory on Gen 1 VM. Using MMIO instead.\n");
} else {
} else if (IS_ENABLED(CONFIG_SYSFB)) {
base = screen_info.lfb_base;
size = screen_info.lfb_size;
}
@ -1076,13 +1076,13 @@ static int hvfb_getmem(struct hv_device *hdev, struct fb_info *info)
getmem_done:
aperture_remove_conflicting_devices(base, size, KBUILD_MODNAME);
if (gen2vm) {
if (!gen2vm) {
pci_dev_put(pdev);
} else if (IS_ENABLED(CONFIG_SYSFB)) {
/* framebuffer is reallocated, clear screen_info to avoid misuse from kexec */
screen_info.lfb_size = 0;
screen_info.lfb_base = 0;
screen_info.orig_video_isVGA = 0;
} else {
pci_dev_put(pdev);
}
return 0;