x86: Make 64-bit efi_ioremap use ioremap on MMIO regions ...
Booting current 64-bit x86 kernels on the latest Apple MacBook
(MacBook5,2) via EFI gives the following warning:
[ 0.182209] ------------[ cut here ]------------
[ 0.182222] WARNING: at arch/x86/mm/pageattr.c:581 __cpa_process_fault+0x44/0xa0()
[ 0.182227] Hardware name: MacBook5,2
[ 0.182231] CPA: called for zero pte. vaddr = ffff8800ffe00000 cpa->vaddr = ffff8800ffe00000
[ 0.182236] Modules linked in:
[ 0.182242] Pid: 0, comm: swapper Not tainted 2.6.31-rc4 #6
[ 0.182246] Call Trace:
[ 0.182254] [<ffffffff8102c754>] ? __cpa_process_fault+0x44/0xa0
[ 0.182261] [<ffffffff81048668>] warn_slowpath_common+0x78/0xd0
[ 0.182266] [<ffffffff81048744>] warn_slowpath_fmt+0x64/0x70
[ 0.182272] [<ffffffff8102c7ec>] ? update_page_count+0x3c/0x50
[ 0.182280] [<ffffffff818d25c5>] ? phys_pmd_init+0x140/0x22e
[ 0.182286] [<ffffffff8102c754>] __cpa_process_fault+0x44/0xa0
[ 0.182292] [<ffffffff8102ce60>] __change_page_attr_set_clr+0x5f0/0xb40
[ 0.182301] [<ffffffff810d1035>] ? vm_unmap_aliases+0x175/0x190
[ 0.182307] [<ffffffff8102d4ae>] change_page_attr_set_clr+0xfe/0x3d0
[ 0.182314] [<ffffffff8102dcca>] _set_memory_uc+0x2a/0x30
[ 0.182319] [<ffffffff8102dd4b>] set_memory_uc+0x7b/0xb0
[ 0.182327] [<ffffffff818afe31>] efi_enter_virtual_mode+0x2ad/0x2c9
[ 0.182334] [<ffffffff818a1c66>] start_kernel+0x2db/0x3f4
[ 0.182340] [<ffffffff818a1289>] x86_64_start_reservations+0x99/0xb9
[ 0.182345] [<ffffffff818a1389>] x86_64_start_kernel+0xe0/0xf2
[ 0.182357] ---[ end trace 4eaa2a86a8e2da22 ]---
[ 0.182982] init_memory_mapping: 00000000ffffc000-0000000100000000
[ 0.182993] 00ffffc000 - 0100000000 page 4k
This happens because the 64-bit version of efi_ioremap calls
init_memory_mapping for all addresses, regardless of whether they are
RAM or MMIO. The EFI tables on this machine ask for runtime access to
some MMIO regions:
[ 0.000000] EFI: mem195: type=11, attr=0x8000000000000000, range=[0x0000000093400000-0x0000000093401000) (0MB)
[ 0.000000] EFI: mem196: type=11, attr=0x8000000000000000, range=[0x00000000ffc00000-0x00000000ffc40000) (0MB)
[ 0.000000] EFI: mem197: type=11, attr=0x8000000000000000, range=[0x00000000ffc40000-0x00000000ffc80000) (0MB)
[ 0.000000] EFI: mem198: type=11, attr=0x8000000000000000, range=[0x00000000ffc80000-0x00000000ffca4000) (0MB)
[ 0.000000] EFI: mem199: type=11, attr=0x8000000000000000, range=[0x00000000ffca4000-0x00000000ffcb4000) (0MB)
[ 0.000000] EFI: mem200: type=11, attr=0x8000000000000000, range=[0x00000000ffcb4000-0x00000000ffffc000) (3MB)
[ 0.000000] EFI: mem201: type=11, attr=0x8000000000000000, range=[0x00000000ffffc000-0x0000000100000000) (0MB)
This arranges to pass the EFI memory type through to efi_ioremap, and
makes efi_ioremap use ioremap rather than init_memory_mapping if the
type is EFI_MEMORY_MAPPED_IO. With this, the above warning goes away.
Signed-off-by: Paul Mackerras <paulus@samba.org>
LKML-Reference: <19062.55858.533494.471153@cargo.ozlabs.ibm.com>
Cc: Huang Ying <ying.huang@intel.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
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