[+cc linux-pci; I don't apply or ack PCI patches unless they appear there]
On Wed, Jul 12, 2023 at 12:43:04AM +0800, Sui Jingfeng wrote:
From: Sui Jingfeng <suijingfeng@xxxxxxxxxxx>Because it's better to access the global screen_info from
The observation behind this is that we should avoid accessing the global
screen_info directly. Call the aperture_contain_firmware_fb_nonreloc()
function to implement the detection of whether an aperture contains the
firmware FB.
aperture_contain_firmware_fb_nonreloc()? The reasoning here is not
super clear to me.
Ok, will be fixed at the next version.This patch helps to decouple the determination from the implementation."how the determination ..." (drop the "does")
Or, in other words, we intend to make the determination opaque to the
caller. The determination may choose to be arch-dependent or
arch-independent. But vgaarb, as a consumer of the determination,
shouldn't care how the does determination is implemented.
Are you saying that aperture_contain_firmware_fb_nonreloc() might be
arch-dependent? Are there multiple callers? Or does this just move
code from one place to a more appropriate place?
Signed-off-by: Sui Jingfeng <suijingfeng@xxxxxxxxxxx>
---
drivers/pci/vgaarb.c | 19 ++++---------------
1 file changed, 4 insertions(+), 15 deletions(-)
diff --git a/drivers/pci/vgaarb.c b/drivers/pci/vgaarb.c
index bf96e085751d..953daf731b2c 100644
--- a/drivers/pci/vgaarb.c
+++ b/drivers/pci/vgaarb.c
@@ -14,6 +14,7 @@
#define vgaarb_info(dev, fmt, arg...) dev_info(dev, "vgaarb: " fmt, ##arg)
#define vgaarb_err(dev, fmt, arg...) dev_err(dev, "vgaarb: " fmt, ##arg)
+#include <linux/aperture.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/pci.h>
@@ -26,7 +27,6 @@
#include <linux/poll.h>
#include <linux/miscdevice.h>
#include <linux/slab.h>
-#include <linux/screen_info.h>
#include <linux/vt.h>
#include <linux/console.h>
#include <linux/acpi.h>
@@ -558,20 +558,11 @@ void vga_put(struct pci_dev *pdev, unsigned int rsrc)
}
EXPORT_SYMBOL(vga_put);
+/* Select the device owning the boot framebuffer if there is one */
static bool vga_is_firmware_default(struct pci_dev *pdev)
{
#if defined(CONFIG_X86) || defined(CONFIG_IA64)
- u64 base = screen_info.lfb_base;
- u64 size = screen_info.lfb_size;
struct resource *r;
- u64 limit;
-
- /* Select the device owning the boot framebuffer if there is one */
-
- if (screen_info.capabilities & VIDEO_CAPABILITY_64BIT_BASE)
- base |= (u64)screen_info.ext_lfb_base << 32;
-
- limit = base + size;
/* Does firmware framebuffer belong to us? */
pci_dev_for_each_resource(pdev, r) {
@@ -581,10 +572,8 @@ static bool vga_is_firmware_default(struct pci_dev *pdev)
if (!r->start || !r->end)
continue;
- if (base < r->start || limit >= r->end)
- continue;
-
- return true;
+ if (aperture_contain_firmware_fb_nonreloc(r->start, r->end))
+ return true;
}
#endif
return false;
--
2.25.1