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From 4a2a0f1420af5a9c869a35afee06f2db8cd2debd Mon Sep 17 00:00:00 2001
From: Scott B <arglebargle@arglebargle.dev>
Date: Sat, 5 Feb 2022 00:53:23 -0800
Subject: [PATCH] iommu/amd: W/A for warning during iommu initialization v2
Workaround for iommu warning introduced by upstream commit
a8d4a37d1bb93608501d0d0545f902061152669a
see LKML: https://lore.kernel.org/lkml/6cf58a4cd925726ef10481d38f9f4e8090f5023d.camel@redhat.com/
------------[ cut here ]------------
WARNING: CPU: 0 PID: 1 at amd_iommu_enable_interrupts+0x36a/0x440
Modules linked in:
CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.16.6-rc1-prexan0-rog-1 #1
Hardware name: ASUSTeK COMPUTER INC. ROG Zephyrus G15 GA503QR_GA503QR/GA503QR, BIOS GA503QR.413 11/03/2021
RIP: 0010:amd_iommu_enable_interrupts+0x36a/0x440
Code: 89 41 18 b8 a0 86 01 00 0f 1f 84 00 00 00 00 00 48 8b 4b 38 8b 89 20 20 00 00 f7 c1 00 01 00 00 0f 85 fa fc ff ff ff c8 75 e6 <0f> 0b e9 ef fc ff ff 48 8b 7b 18 80 7f 6d 00 0f 84 81 00 00 00 be
RSP: 0018:ffff996880087c18 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff8bfb0004a800 RCX: 0000000000000098
RDX: 0000000000000008 RSI: ffff996880087c20 RDI: ffff9968801000f0
RBP: ffff996880087c18 R08: ffff8bfb015eabc8 R09: 0000000000000000
R10: 0000000000000000 R11: ffffffffffffffff R12: ffffffff7fffffff
R13: 000fffff80000000 R14: 0000000000000000 R15: ffffffffa217af68
FS: 0000000000000000(0000) GS:ffff8bfdde400000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 00000000bee10000 CR4: 0000000000750ef0
PKRU: 55555554
Call Trace:
<TASK>
? iommu_setup+0x2a2/0x2a2
state_next+0x6e/0x1c9
? iommu_setup+0x2a2/0x2a2
iommu_go_to_state+0x1f/0x33
amd_iommu_init+0xb/0x45
pci_iommu_init+0xd/0x45
? iommu_setup+0x2a2/0x2a2
__initstub__kmod_pci_dma__271_136_pci_iommu_initrootfs+0x5/0x8
do_one_initcall+0xb6/0x230
? parse_one+0xa8/0x2a0
? parse_one+0x53/0x2a0
? parse_args+0xe7/0x1e0
? do_initcall_level+0x96/0x96
do_initcall_level+0x83/0x96
do_initcalls+0x44/0x6d
kernel_init_freeable+0x13f/0x1a0
? rest_init+0xb0/0xb0
kernel_init+0x11/0x1b0
ret_from_fork+0x1f/0x30
</TASK>
---[ end trace aec8e9a873f1d2d8 ]---
---
drivers/iommu/amd/init.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/iommu/amd/init.c b/drivers/iommu/amd/init.c
index b94822fc2c9f..7afdbb156288 100644
--- a/drivers/iommu/amd/init.c
+++ b/drivers/iommu/amd/init.c
@@ -83,7 +83,7 @@
#define ACPI_DEVFLAG_LINT1 0x80
#define ACPI_DEVFLAG_ATSDIS 0x10000000
-#define LOOP_TIMEOUT 100000
+#define LOOP_TIMEOUT 1000000
/*
* ACPI table definitions
*
--
2.35.1
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