063e1567d8
This patch contain minimal set of changes to initial IVRS implementation to make it work reliably. Code in this patch was tested with Xen 4.8 and Debian 4.14.y - this software stack survived 100x reboots without any hang on PC Engines apu2c4. Previously using IVRS provided by AGESA lead to 29/100 hangs. MMIO base shall not be hard coded since this value depends on platform design. Performance counters were selected experimentally, since lack of them cause 4.14.y panic: [ 1.064229] AMD-Vi: IOMMU performance counters supported [ 1.069579] BUG: unable to handle kernel paging request at ffffaffc4065c000 [ 1.073554] IP: iommu_go_to_state+0xf8a/0x1260 [ 1.073554] PGD 12a11f067 P4D 12a11f067 PUD 12a120067 PMD 129b69067 PTE 0 [ 1.073554] Oops: 0000 [#1] SMP NOPTI [ 1.073554] Modules linked in: [ 1.073554] CPU: 1 PID: 1 Comm: swapper/0 Not tainted 4.14.50 #13 [ 1.073554] Hardware name: PC Engines apu2/apu2, BIOS 4.8-1174-gf12b3046f0-d2 [ 1.073554] task: ffff8d5d69b9f040 task.stack: ffffaffc40648000 [ 1.073554] RIP: 0010:iommu_go_to_state+0xf8a/0x1260 [ 1.073554] RSP: 0018:ffffaffc4064be28 EFLAGS: 00010282 [ 1.073554] RAX: ffffaffc40658000 RBX: ffff8d5d69bae000 RCX: ffffffff99e57b88 [ 1.073554] RDX: 0000000000000000 RSI: 0000000000000092 RDI: 0000000000000246 [ 1.073554] RBP: 0000000000000040 R08: 0000000000000001 R09: 0000000000000170 [ 1.073554] R10: 0000000000000000 R11: ffffffff9a435e2d R12: 0000000000000000 [ 1.073554] R13: ffffffff9a29a830 R14: 0000000000000000 R15: 0000000000000000 [ 1.073554] FS: 0000000000000000(0000) GS:ffff8d5d6ec80000(0000) knlGS:00000 [ 1.073554] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 1.073554] CR2: ffffaffc4065c000 CR3: 000000010fa0a000 CR4: 00000000000406e0 [ 1.073554] Call Trace: [ 1.073554] ? set_debug_rodata+0x11/0x11 [ 1.073554] amd_iommu_init+0x11/0x89 [ 1.073554] pci_iommu_init+0x16/0x3f [ 1.073554] ? e820__memblock_setup+0x60/0x60 [ 1.073554] do_one_initcall+0x51/0x190 [ 1.073554] ? set_debug_rodata+0x11/0x11 [ 1.073554] kernel_init_freeable+0x16b/0x1ec [ 1.073554] ? rest_init+0xb0/0xb0 [ 1.073554] kernel_init+0xa/0xf7 [ 1.073554] ret_from_fork+0x22/0x40 [ 1.073554] Code: d2 31 f6 48 89 df e8 d8 15 02 ff 85 c0 75 d1 48 8b 44 24 2 [ 1.073554] RIP: iommu_go_to_state+0xf8a/0x1260 RSP: ffffaffc4064be28 [ 1.073554] CR2: ffffaffc4065c000 [ 1.073554] ---[ end trace 44588f98aa7c7c0b ]--- [ 1.255973] Kernel panic - not syncing: Attempted to kill init! exitcode=0x09 [ 1.255973] [ 1.259934] ---[ end Kernel panic - not syncing: Attempted to kill init! exi9 Possible future improvements: - compare device entries with values returned by AGESA - enable EFRSup (this is enabled in AGESA) - try various IVHD flags (there is difference between initial implementation and AGESA) Change-Id: I7e3a3d21f295ae96962d7718b9568fc4b67eb23d Signed-off-by: Piotr Król <piotr.krol@3mdeb.com> Reviewed-on: https://review.coreboot.org/27602 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Marc Jones <marc@marcjonesconsulting.com> |
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| .. | ||
| acpi | ||
| arch | ||
| commonlib | ||
| console | ||
| cpu | ||
| device | ||
| drivers | ||
| ec | ||
| include | ||
| lib | ||
| mainboard | ||
| northbridge | ||
| security | ||
| soc | ||
| southbridge | ||
| superio | ||
| vendorcode | ||
| Kconfig | ||