[PATCH v8 0/4] ACPI: parse the SPCR table

[Itaru Kitayama]

Hi Aleksey,

I've wondering whether your V8 patch set should support !4K-page kernels.
So far I've seen that on Mustang, 4K-page kernel boots fine, but 64K-page
kernel always ends up with a panic.

[    0.000000] cma: Reserved 512 MiB at 0x00000040e0000000
[    0.000000] ACPI: Early table checksum verification disabled
[    0.000000] ACPI: RSDP 0x00000043FA859014 000024 (v02 APM   )
[    0.000000] ACPI: XSDT 0x00000043FA8580E8 00007C (v01 APM XGENE    
00000003      01000013)
[    0.000000] ACPI: FACP 0x00000043FA850000 00010C (v05 APM XGENE    
00000003 INTL 20140724)
[    0.000000] ACPI: DSDT 0x00000043FA851000 003A00 (v05 APM APM88xxx 
00000001 INTL 20140724)
[    0.000000] ACPI: DBG2 0x00000043FA855000 0000AA (v00 APMC0D XGENEDBG 
00000000 INTL 20140724)
[    0.000000] ACPI: GTDT 0x00000043FA84E000 0000E0 (v02 APM XGENE    
00000001 INTL 20140724)
[    0.000000] ACPI: MCFG 0x00000043FA84D000 00003C (v01 APM XGENE    
00000002 INTL 20140724)
[    0.000000] ACPI: SPCR 0x00000043FA84C000 000050 (v02 APMC0D XGENESPC 
00000000 INTL 20140724)
[    0.000000] ACPI: SSDT 0x00000043FA84B000 00002D (v02 APM XGENE    
00000001 INTL 20140724)
[    0.000000] ACPI: BERT 0x00000043FA84A000 000030 (v01 APM XGENE    
00000002 INTL 20140724)
[    0.000000] ACPI: HEST 0x00000043FA849000 0002A8 (v01 APM XGENE    
00000002 INTL 20140724)
[    0.000000] ACPI: APIC 0x00000043FA848000 0002A4 (v03 APM XGENE    
00000003      01000013)
[    0.000000] ACPI: SSDT 0x00000043FA847000 000063 (v02 REDHAT MACADDRS 
00000001      01000013)
[    0.000000] ACPI: SSDT 0x00000043FA846000 000032 (v02 REDHAT UARTCLKS 
00000001      01000013)
[    0.000000] ACPI: SPCR: console: uart,mmio,0x1c020000,115200
[    0.000000] memblock_reserve: [0x000043ffff0000-0x000043ffffffff] 
flags 0x0 memblock_alloc_range_nid+0x64/0x78
[    0.000000] ------------[ cut here ]------------
[    0.000000] kernel BUG at arch/arm64/mm/mmu.c:480!
[    0.000000] Internal error: Oops - BUG: 0 [#1] PREEMPT SMP
[    0.000000] Modules linked in:
[    0.000000] CPU: 0 PID: 0 Comm: swapper Not tainted 4.7.0-rc1-dev+ #28
[    0.000000] Hardware name: APM X-Gene Mustang board (DT)
[    0.000000] task: ffff000008e18980 ti: ffff000008df0000 task.ti: 
ffff000008df0000
[    0.000000] PC is at map_kernel_segment+0x44/0xb0
[    0.000000] LR is at paging_init+0x84/0x5b0
[    0.000000] pc : [<ffff000008b350e0>] lr : [<ffff000008b351d0>] 
pstate: 600002c5
[    0.000000] sp : ffff000008df3e60
[    0.000000] x29: ffff000008df3e60 x28: 0000004000d3001c
[    0.000000] x27: 00000040009b2074 x26: 0000004001bd0000
[    0.000000] x25: ffff7fdffe5e0000 x24: 00000043ffff0000
[    0.000000] x23: 0000000000000000 x22: 000000000078b000
[    0.000000] x21: 0000004000235000 x20: ffff000008b30000
[    0.000000] x19: ffff000008f01300 x18: 0000000000000006
[    0.000000] x17: ffff00000993a638 x16: 0000000000000004
[    0.000000] x15: ffff00000992e03d x14: 2030783020736761
[    0.000000] x13: 6c66205d66666666 x12: 6666666633343030
[    0.000000] x11: 303078302d303030 x10: 3066666666333430
[    0.000000] x9 : 0000000000000000 x8 : ffff7fdffe620000
[    0.000000] x7 : 0000000000000000 x6 : 000000000000003f
[    0.000000] x5 : 0000000000005000 x4 : ffff000008f01300
[    0.000000] x3 : 00c8000000000713 x2 : ffff0000087c0000
[    0.000000] x1 : ffff000008035000 x0 : ffff7fdffe5e0000
[    0.000000]
[    0.000000] Process swapper (pid: 0, stack limit = 0xffff000008df0020)
[    0.000000] Stack: (0xffff000008df3e60 to 0xffff000008df4000)
[    0.000000] 3e60: ffff000008df3ea0 ffff000008b351d0 ffff000008f01300 
ffff000008b30000
[    0.000000] 3e80: ffff000008035000 ffff0000087c0000 0000000000000000 
ffff000008b55480
[    0.000000] 3ea0: ffff000008df3f20 ffff000008b32708 ffff000008035000 
ffff000008e30cd8
[    0.000000] 3ec0: ffff7fdffe800000 ffff000008e10000 0000000000000000 
0000004000200000
[    0.000000] 3ee0: 0000004001ba0000 0000004001bd0000 00000040009b2074 
0000004000d3001c
[    0.000000] 3f00: ffff7fdffe800000 0000004000200000 ffff7fdffe620000 
000000000000010c
[    0.000000] 3f20: ffff000008df3fa0 ffff000008b30848 ffff000008b7d588 
ffff000008f00000
[    0.000000] 3f40: ffff000008f00000 ffff000008e10000 0000000000000000 
0000004000200000
[    0.000000] 3f60: 0000004001ba0000 0000004001bd0000 0000000000000001 
000000401fe00000
[    0.000000] 3f80: ffffffffffffffff 0000000000000000 0000000000000080 
fefefefefefefefe
[    0.000000] 3fa0: 0000000000000000 ffff000008b301bc 00000043f7f1f408 
0000000000000e12
[    0.000000] 3fc0: 000000401fe00000 0000000030d00800 0000000000000000 
0000004000200000
[    0.000000] 3fe0: 0000000000000000 ffff000008b7d588 0000000000000000 
0000000000000000
[    0.000000] Call trace:
[    0.000000] Exception stack(0xffff000008df3ca0 to 0xffff000008df3dc0)
[    0.000000] 3ca0: ffff000008f01300 ffff000008b30000 ffff000008df3e60 
ffff000008b350e0
[    0.000000] 3cc0: 0000004001ba0000 0000004001bd0000 00000040009b2074 
0000004000d3001c
[    0.000000] 3ce0: 0000000000000030 0000000000000000 000000000993045a 
00000000000002c0
[    0.000000] 3d00: ffff000008df3e00 ffff000008df3e00 ffff000008df3dc0 
00000000ffffffc8
[    0.000000] 3d20: ffff000008df3d50 ffff00000811b3d8 ffff000008df3e00 
ffff000008df3e00
[    0.000000] 3d40: ffff7fdffe5e0000 ffff000008035000 ffff0000087c0000 
00c8000000000713
[    0.000000] 3d60: ffff000008f01300 0000000000005000 000000000000003f 
0000000000000000
[    0.000000] 3d80: ffff7fdffe620000 0000000000000000 3066666666333430 
303078302d303030
[    0.000000] 3da0: 6666666633343030 6c66205d66666666 2030783020736761 
ffff00000992e03d
[    0.000000] [<ffff000008b350e0>] map_kernel_segment+0x44/0xb0
[    0.000000] [<ffff000008b351d0>] paging_init+0x84/0x5b0
[    0.000000] [<ffff000008b32708>] setup_arch+0x198/0x534
[    0.000000] [<ffff000008b30848>] start_kernel+0x70/0x388
[    0.000000] [<ffff000008b301bc>] __primary_switched+0x30/0x74
[    0.000000] Code: cb150035 92403ea5 cb010056 b4000045 (d4210000)
[    0.000000] ---[ end trace cb88537fdc8fa200 ]---
[    0.000000] Kernel panic - not syncing: Attempted to kill the idle task!
[    0.000000] ---[ end Kernel panic - not syncing: Attempted to kill 
the idle task!