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

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Hi,

On 2023/6/20 02:12, Limonciello, Mario wrote:

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>

Thanks a lot,

can you help to resend this precious R-B to the V7 of this series [1],

This is V6.

[1] https://patchwork.freedesktop.org/series/119250/

  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;

--
Jingfeng




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