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Date: Fri, 29 Sep 2006 20:11:19 +0300
From: Muli Ben-Yehuda <muli@il.ibm.com>
To: Jon Mason <jdmason@kudzu.us>
Cc: Jeff Garzik <jeff@garzik.org>, Andrew Morton <akpm@osdl.org>,
       Greg KH <greg@kroah.com>, Jim Paradis <jparadis@redhat.com>,
       Andi Kleen <ak@suse.de>, LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] x86[-64] PCI domain support
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On Fri, Sep 29, 2006 at 08:43:31AM -0500, Jon Mason wrote:

> Nak!  The calgary code should not be affected by these patches.

It is. It triggers the BUG() I put there exactly in case someone tries
to grab ->sysdata from uder us.

PCI-DMA: Using Calgary IOMMU
Calgary: dev ffff8101979a7800 has sysdata ffff81019795f620
----------- [cut here ] --------- [please bite here ] ---------
Kernel BUG at ...uli/w/iommu/calgary/linux/arch/x86_64/kernel/tce.c:143
invalid opcode: 0000 [1] SMP
CPU 1
Modules linked in:
Pid: 1, comm: swapper Not tainted 2.6.18mx #115
RIP: 0010:[<ffffffff8021b38c>]  [<ffffffff8021b38c>] build_tce_table+0x2b/0x126
RSP: 0000:ffff810197c7de70  EFLAGS: 00010282
RAX: 000000000000003e RBX: 00000000ffffffc3 RCX: 0000000000000000
RDX: ffffffff8022e3ee RSI: 0000000000000000 RDI: ffff810197c67040
RBP: ffff810197c7de90 R08: 0000000000000002 R09: ffffffff8022df0a
R10: 0000000000000000 R11: ffffffff80762280 R12: ffffc20000080000
R13: ffff8101979a7800 R14: ffffc20000080000 R15: 00000000ffffffed
FS:  0000000000000000(0000) GS:ffff810197c75cc0(0000) knlGS:0000000000000000
CS:  0010 DS: 0018 ES: 0018 CR0: 000000ffff80c728db 0000000000000000 00000000000 00000
 ffffffff80c9cf18 0000000000000000 0000000000000000 0000000000000000
Call Trace:
 [<ffffffff80c728db>] calgary_iommu_init+0x11e/0x569
 [<ffffffff80c6b6fe>] pci_iommu_init+0x9/0x17
 [<ffffffff8020718d>] init+0x145/0x300
 [<ffffffff805d8e51>] trace_hardirqs_on_thunk+0x35/0x37
 [<ffffffff80244a46>] trace_hardirqs_on+0xfe/0x129
 [<ffffffff8020a6c8>] child_rip+0xa/0x12
 [<ffffffff805d95ea>] _spin_unlock_irq+0x29/0x2f
 [<ffffffff80209e4d>] restore_args+0x0/0x30
 [<ffffffff80207048>] init+0x0/0x300
 [<ffffffff8020a6be>] child_rip+0x0/0x12

> The PCI domain code uses the sysdata pointer from struct pci_bus,
> where as calgary uses the sysdata pointer from struct pci_dev.  This
> should not be an issue.  Can you confirm actual breakage?

See above. This is with mainline + Jeff's PCI domains patch.

In any case, even if it wasn't necessary, I'd like to take advantage
of Jeff's sysdata changes and get rid of our hack, as having an
extensible struct hanging of ->sysdata is the right way to go
forward.

Cheers,
Muli
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