Re: [PATCH v6 2/8] PCI/VGA: Deal only with VGA class devices

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On 6/12/2023 2:25 PM, Sui Jingfeng wrote:
From: Sui Jingfeng <suijingfeng@xxxxxxxxxxx>

Deal only with the VGA devcie(pdev->class == 0x0300), so replace the
pci_get_subsys() function with pci_get_class(). Filter the non-PCI display
device(pdev->class != 0x0300) out. There no need to process the non-display
PCI device.

Signed-off-by: Sui Jingfeng <suijingfeng@xxxxxxxxxxx>
---
This also means that deleting a PCI device no longer needs
to walk the list.

Reviewed-by: Mario Limonciello <mario.limonciello@xxxxxxx>

  drivers/pci/vgaarb.c | 22 ++++++++++++----------
  1 file changed, 12 insertions(+), 10 deletions(-)

diff --git a/drivers/pci/vgaarb.c b/drivers/pci/vgaarb.c
index c1bc6c983932..22a505e877dc 100644
--- a/drivers/pci/vgaarb.c
+++ b/drivers/pci/vgaarb.c
@@ -754,10 +754,6 @@ static bool vga_arbiter_add_pci_device(struct pci_dev *pdev)
  	struct pci_dev *bridge;
  	u16 cmd;
- /* Only deal with VGA class devices */
-	if ((pdev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
-		return false;
-
  	/* Allocate structure */
  	vgadev = kzalloc(sizeof(struct vga_device), GFP_KERNEL);
  	if (vgadev == NULL) {
@@ -1500,7 +1496,9 @@ static int pci_notify(struct notifier_block *nb, unsigned long action,
  	struct pci_dev *pdev = to_pci_dev(dev);
  	bool notify = false;
- vgaarb_dbg(dev, "%s\n", __func__);
+	/* Only deal with VGA class devices */
+	if (pdev->class != PCI_CLASS_DISPLAY_VGA << 8)
+		return 0;
/* For now we're only intereted in devices added and removed. I didn't
  	 * test this thing here, so someone needs to double check for the
@@ -1510,6 +1508,8 @@ static int pci_notify(struct notifier_block *nb, unsigned long action,
  	else if (action == BUS_NOTIFY_DEL_DEVICE)
  		notify = vga_arbiter_del_pci_device(pdev);
+ vgaarb_dbg(dev, "%s: action = %lu\n", __func__, action);
+
  	if (notify)
  		vga_arbiter_notify_clients();
  	return 0;
@@ -1534,8 +1534,8 @@ static struct miscdevice vga_arb_device = {
static int __init vga_arb_device_init(void)
  {
+	struct pci_dev *pdev = NULL;
  	int rc;
-	struct pci_dev *pdev;
rc = misc_register(&vga_arb_device);
  	if (rc < 0)
@@ -1545,11 +1545,13 @@ static int __init vga_arb_device_init(void)
/* We add all PCI devices satisfying VGA class in the arbiter by
  	 * default */
-	pdev = NULL;
-	while ((pdev =
-		pci_get_subsys(PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID,
-			       PCI_ANY_ID, pdev)) != NULL)
+	while (1) {
+		pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev);
+		if (!pdev)
+			break;
+
  		vga_arbiter_add_pci_device(pdev);
+	}
pr_info("loaded\n");
  	return rc;



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