linux-kernel - RE: [PATCH 1/2] msi: set 'En' bit of MSI Mapping Capability on HT platform

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Message-ID: <15F501D1A78BD343BE8F4D8DB854566B1D8A3CF3@hkemmail01.nvidia.com>
Date:	Mon, 26 Nov 2007 12:01:58 +0800
From:	"Peer Chen" <pchen@...dia.com>
To:	"Robert Hancock" <hancockr@...w.ca>,
	"peerchen" <peerchen@...il.com>
Cc:	"linux-kernel" <linux-kernel@...r.kernel.org>,
	"akpm" <akpm@...ux-foundation.org>,
	"Andy Currid" <ACurrid@...dia.com>
Subject: RE: [PATCH 1/2] msi: set 'En' bit of MSI Mapping Capability on HT platform

I think the following lines are suitable for other bridges besides
nvidia's, :) :
===================
+		if (pci_enable_msi_ht_cap(dev) != 0) {
+			return 0;
+		} else {
+			/* Get upstream bridge device handle */
+
+			bridge_dev = dev->bus->self;
+			while(bridge_dev != 0) {
+				if (pci_enable_msi_ht_cap(bridge_dev) !=
0) {
+					return 0;
+				} else
+					bridge_dev =
bridge_dev->bus->self;
+			}
+
+			return 1;
+		} 


BRs
Peer Chen

-----Original Message-----
From: Robert Hancock [mailto:hancockr@...w.ca] 
Sent: Monday, November 26, 2007 2:34 AM
To: peerchen
Cc: linux-kernel; akpm; Peer Chen; Andy Currid
Subject: Re: [PATCH 1/2] msi: set 'En' bit of MSI Mapping Capability on
HT platform

peerchen wrote:
> According to the HyperTransport spec, 'En' indicate if the MSI Mapping
is active. So it should be set when enable the MSI.
> 
> The patch base on kernel 2.6.24-rc3
> 
> Signed-off-by: Andy Currid <acurrid@...dia.com>
> Signed-off-by: Peer Chen <pchen@...dia.com>

Isn't there a way we can make this work for any upstream HT bridge,
rather than only for specific NVIDIA chipsets?

-- 
Robert Hancock      Saskatoon, SK, Canada
To email, remove "nospam" from hancockr@...pamshaw.ca Home Page:
http://www.roberthancock.com/

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