linux-kernel - [PATCH 2/4] x86: early_quirk check all dev/func in domain 0

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Message-ID: <4D2BAA7B.3030800@kernel.org>
Date:	Mon, 10 Jan 2011 16:55:23 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	Jesse Barnes <jbarnes@...tuousgeek.org>, Greg KH <greg@...ah.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>
CC:	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	linux-usb@...r.kernel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH 2/4]  x86: early_quirk check all dev/func in domain 0


go with all buses instead of bus0.
also only check header type on func0.

Signed-off-by: Yinghai Lu <yinghai@...nel.org>

---
 arch/x86/kernel/early-quirks.c |   29 ++++++++++++++++-------------
 1 file changed, 16 insertions(+), 13 deletions(-)

Index: linux-2.6/arch/x86/kernel/early-quirks.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/early-quirks.c
+++ linux-2.6/arch/x86/kernel/early-quirks.c
@@ -243,7 +243,7 @@ static int __init check_dev_quirk(int nu
 	class = read_pci_config_16(num, slot, func, PCI_CLASS_DEVICE);
 
 	if (class == 0xffff)
-		return -1; /* no class, treat as single function */
+		return 0; /* no class, func gap */
 
 	vendor = read_pci_config_16(num, slot, func, PCI_VENDOR_ID);
 
@@ -263,27 +263,30 @@ static int __init check_dev_quirk(int nu
 			}
 	}
 
-	type = read_pci_config_byte(num, slot, func,
-				    PCI_HEADER_TYPE);
-	if (!(type & 0x80))
-		return -1;
+	if (func == 0) {
+		type = read_pci_config_byte(num, slot, func,
+					    PCI_HEADER_TYPE);
+		if (!(type & 0x80))
+			return -1;
+	}
 
 	return 0;
 }
 
 void __init early_quirks(void)
 {
-	int slot, func;
+	int num, slot, func;
 
 	if (!early_pci_allowed())
 		return;
 
 	/* Poor man's PCI discovery */
-	/* Only scan the root bus */
-	for (slot = 0; slot < 32; slot++)
-		for (func = 0; func < 8; func++) {
-			/* Only probe function 0 on single fn devices */
-			if (check_dev_quirk(0, slot, func))
-				break;
-		}
+	/* Only can scan first domain */
+	for (num = 0; num < 256; num++)
+		for (slot = 0; slot < 32; slot++)
+			for (func = 0; func < 8; func++) {
+				/* Only probe func 0 on single fn devices */
+				if (check_dev_quirk(num, slot, func))
+					break;
+			}
 }
--
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