linux-kernel - Re: [Bug #12608] 2.6.29-rc powerpc G5 Xorg legacy

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Date:	Fri, 6 Feb 2009 22:17:41 +0000 (GMT)
From:	Hugh Dickins <hugh@...itas.com>
To:	Jesse Barnes <jbarnes@...tuousgeek.org>
cc:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Kernel Testers List <kernel-testers@...r.kernel.org>
Subject: Re: [Bug #12608] 2.6.29-rc powerpc G5 Xorg legacy_mem regression

On Fri, 6 Feb 2009, Jesse Barnes wrote:
> 
> Hugh, did you get a chance to try my X patch (w/o Ben's patch applied)?  If it 
> also works, we should apply it to X too, if only to make porting to future 
> platforms a little easier.

I have tried it now: I'm sorry to say it does not work, fails with
(WW) xf86MapDomainMem():  mmap() failure: No such device or address

Fatal server error:
AddScreen/ScreenInit failed for driver 0

The "mmap() failure" line is of course the one you're intentionally
showing, but the AddScreen/ScreenInit one is not what you want.
Presumably it demands something other than a NULL addr returned,
but I haven't followed that up at all.

I have tried the obvious patch below, which reverts to the original
code if the mmap fails: this works, but presumably negates much of
what you intended to achieve with legacy_mem.

Easy for me to try something else, fire away.

Hugh

--- a/hw/xfree86/os-support/bus/linuxPci.c
+++ b/hw/xfree86/os-support/bus/linuxPci.c
@@ -501,8 +501,10 @@ xf86MapDomainMemory(int ScreenNum, int F
     if (fd >= 0)
 	close(fd);
     if (addr == NULL || addr == MAP_FAILED) {
-	perror("mmap failure");
-	FatalError("xf86MapDomainMem():  mmap() failure\n");
+	xf86Msg(X_WARNING, "xf86MapDomainMem():  mmap() failure: %s\n",
+		strerror(errno));
+	return linuxMapPci(ScreenNum, Flags, dev, Base, Size,
+			   PCIIOC_MMAP_IS_MEM);
     }
     return addr;
 }
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