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From: "Maciej W. Rozycki" <macro@orcam.me.uk>
To: Bjorn Helgaas <bhelgaas@google.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
	"H. Peter Anvin" <hpa@zytor.com>
Cc: x86@kernel.org, linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [RESEND][PATCH v2 2/4] x86/PCI: Include function number in $PIR table dump
Date: Thu, 31 Mar 2022 08:10:17 +0100 (BST)	[thread overview]
Message-ID: <alpine.DEB.2.21.2203301534440.22465@angie.orcam.me.uk> (raw)
In-Reply-To: <alpine.DEB.2.21.2203301527270.22465@angie.orcam.me.uk>

Contrary to the PCI BIOS specification[1] some systems include the PCI 
function number for motherboard devices in their $PIR table, e.g. this 
is what the Tyan Tomcat IV S1564D board reports:

00:14 slot=01
 0:60/deb8
 1:61/deb8
 2:62/deb8
 3:63/deb8

00:13 slot=02
 0:61/deb8
 1:62/deb8
 2:63/deb8
 3:60/deb8

00:12 slot=03
 0:62/deb8
 1:63/deb8
 2:60/deb8
 3:61/deb8

00:11 slot=04
 0:63/deb8
 1:60/deb8
 2:61/deb8
 3:62/deb8

00:07 slot=00
 0:00/deb8
 1:00/deb8
 2:00/deb8
 3:00/deb8

00:07 slot=00
 0:00/deb8
 1:00/deb8
 2:00/deb8
 3:63/deb8

Print the function number then in the debug $PIR table dump:

00:14.0 slot=01
 0:60/deb8
 1:61/deb8
 2:62/deb8
 3:63/deb8

00:13.0 slot=02
 0:61/deb8
 1:62/deb8
 2:63/deb8
 3:60/deb8

00:12.0 slot=03
 0:62/deb8
 1:63/deb8
 2:60/deb8
 3:61/deb8

00:11.0 slot=04
 0:63/deb8
 1:60/deb8
 2:61/deb8
 3:62/deb8

00:07.1 slot=00
 0:00/deb8
 1:00/deb8
 2:00/deb8
 3:00/deb8

00:07.2 slot=00
 0:00/deb8
 1:00/deb8
 2:00/deb8
 3:63/deb8

References:

[1] "PCI BIOS Specification", Revision 2.1, PCI Special Interest Group, 
    August 26, 1994, Table 4-1 "Layout of IRQ routing table entry.", p. 
    12

Signed-off-by: Maciej W. Rozycki <macro@orcam.me.uk>
---
No change from v1.
---
 arch/x86/pci/irq.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

linux-x86-debug-pirq-fn.diff
Index: linux-macro/arch/x86/pci/irq.c
===================================================================
--- linux-macro.orig/arch/x86/pci/irq.c
+++ linux-macro/arch/x86/pci/irq.c
@@ -135,7 +135,8 @@ static void __init pirq_peer_trick(void)
 #ifdef DEBUG
 		{
 			int j;
-			DBG(KERN_DEBUG "%02x:%02x slot=%02x", e->bus, e->devfn/8, e->slot);
+			DBG(KERN_DEBUG "%02x:%02x.%x slot=%02x",
+			    e->bus, e->devfn / 8, e->devfn % 8, e->slot);
 			for (j = 0; j < 4; j++)
 				DBG(" %d:%02x/%04x", j, e->irq[j].link, e->irq[j].bitmap);
 			DBG("\n");

  parent reply	other threads:[~2022-03-31  7:10 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-03-31  7:10 [RESEND][PATCH v2 0/4] x86/PCI: Odd generic PIRQ router improvements Maciej W. Rozycki
2022-03-31  7:10 ` [RESEND][PATCH v2 1/4] x86/PCI: Show the physical address of the $PIR table Maciej W. Rozycki
2022-04-10 10:54   ` [tip: x86/irq] " tip-bot2 for Maciej W. Rozycki
2022-03-31  7:10 ` Maciej W. Rozycki [this message]
2022-04-10 10:54   ` [tip: x86/irq] x86/PCI: Include function number in $PIR table dump tip-bot2 for Maciej W. Rozycki
2022-03-31  7:10 ` [RESEND][PATCH v2 3/4] x86/PCI: Also match function number in $PIR table Maciej W. Rozycki
2022-04-10 10:54   ` [tip: x86/irq] " tip-bot2 for Maciej W. Rozycki
2022-03-31  7:10 ` [RESEND][PATCH v2 4/4] x86/PCI: Handle IRQ swizzling with PIRQ routers Maciej W. Rozycki
2022-04-10 10:54   ` [tip: x86/irq] " tip-bot2 for Maciej W. Rozycki

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