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authorHuacai Chen <chenhuacai@loongson.cn>2022-02-25 01:47:51 +0300
committerBjorn Helgaas <bhelgaas@google.com>2022-03-10 03:31:28 +0300
commit4e6c91847a7fa94a6a0caeeb388718b8ae005d56 (patch)
treed4f7cd8f995d0e4a27d932918641e8183727a08b /drivers/pci/vgaarb.c
parentdc593fd48abbea1e840c847c464eabc9c6bca180 (diff)
downloadlinux-4e6c91847a7fa94a6a0caeeb388718b8ae005d56.tar.xz
PCI/VGA: Log bridge control messages when adding devices
Previously vga_arb_device_init() iterated through all VGA devices and indicated whether legacy VGA routing to each could be controlled by an upstream bridge. But we determine that information in vga_arbiter_add_pci_device(), which we call for every device, so we can log it there without iterating through the VGA devices again. Note that we call vga_arbiter_check_bridge_sharing() before adding the device to vga_list, so we have to handle the very first device separately. Link: https://lore.kernel.org/r/20220224224753.297579-10-helgaas@kernel.org Signed-off-by: Huacai Chen <chenhuacai@loongson.cn> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Diffstat (limited to 'drivers/pci/vgaarb.c')
-rw-r--r--drivers/pci/vgaarb.c19
1 files changed, 8 insertions, 11 deletions
diff --git a/drivers/pci/vgaarb.c b/drivers/pci/vgaarb.c
index 582f0054b71a..7b1bfdea9d10 100644
--- a/drivers/pci/vgaarb.c
+++ b/drivers/pci/vgaarb.c
@@ -719,8 +719,10 @@ static void vga_arbiter_check_bridge_sharing(struct vga_device *vgadev)
vgadev->bridge_has_one_vga = true;
- if (list_empty(&vga_list))
+ if (list_empty(&vga_list)) {
+ vgaarb_info(&vgadev->pdev->dev, "bridge control possible\n");
return;
+ }
/* okay iterate the new devices bridge hierarachy */
new_bus = vgadev->pdev->bus;
@@ -759,6 +761,11 @@ static void vga_arbiter_check_bridge_sharing(struct vga_device *vgadev)
}
new_bus = new_bus->parent;
}
+
+ if (vgadev->bridge_has_one_vga)
+ vgaarb_info(&vgadev->pdev->dev, "bridge control possible\n");
+ else
+ vgaarb_info(&vgadev->pdev->dev, "no bridge control possible\n");
}
/*
@@ -1557,7 +1564,6 @@ static int __init vga_arb_device_init(void)
{
int rc;
struct pci_dev *pdev;
- struct vga_device *vgadev;
rc = misc_register(&vga_arb_device);
if (rc < 0)
@@ -1573,15 +1579,6 @@ static int __init vga_arb_device_init(void)
PCI_ANY_ID, pdev)) != NULL)
vga_arbiter_add_pci_device(pdev);
- list_for_each_entry(vgadev, &vga_list, list) {
- struct device *dev = &vgadev->pdev->dev;
-
- if (vgadev->bridge_has_one_vga)
- vgaarb_info(dev, "bridge control possible\n");
- else
- vgaarb_info(dev, "no bridge control possible\n");
- }
-
pr_info("loaded\n");
return rc;
}