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arm64: Expose the end of the linear map in PHYSMEM_END

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The memory hot-plug and resource management code needs to know the
largest address which can fit in the linear map, so set PHYSMEM_END for
that purpose.

This fixes a crash at boot when amdgpu tries to create
DEVICE_PRIVATE_MEMORY and is given a physical address by the resource
management code which is outside the range which can have a `struct
page`

 | Unable to handle kernel paging request at virtual address 000001ffa6000034
 | user pgtable: 4k pages, 48-bit VAs, pgdp=000008000287c000
 | [000001ffa6000034] pgd=0000000000000000, p4d=0000000000000000
 | Call trace:
 |  __init_zone_device_page.constprop.0+0x2c/0xa8
 |  memmap_init_zone_device+0xf0/0x210
 |  pagemap_range+0x1e0/0x410
 |  memremap_pages+0x18c/0x2e0
 |  devm_memremap_pages+0x30/0x90
 |  kgd2kfd_init_zone_device+0xf0/0x200 [amdgpu]
 |  amdgpu_device_ip_init+0x674/0x888 [amdgpu]
 |  amdgpu_device_init+0x7a4/0xea0 [amdgpu]
 |  amdgpu_driver_load_kms+0x28/0x1c0 [amdgpu]
 |  amdgpu_pci_probe+0x1a0/0x560 [amdgpu]

Signed-off-by: D Scott Phillips <scott@os.amperecomputing.com>
Link: https://lore.kernel.org/r/20240903164532.3874988-1-scott@os.amperecomputing.com
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
D Scott Phillips 2024-09-03 09:45:32 -07:00 committed by Will Deacon
parent 7eced90b20
commit eeb8fdfcf0
1 changed files with 2 additions and 0 deletions
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2
arch/arm64/include/asm/memory.h
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@ -110,6 +110,8 @@
#define PAGE_END (_PAGE_END(VA_BITS_MIN))
#endif /* CONFIG_KASAN */
#define PHYSMEM_END __pa(PAGE_END - 1)
#define MIN_THREAD_SHIFT (14 + KASAN_THREAD_SHIFT)
/*