arm64: mm: Move PCI I/O emulation region above the vmemmap region
Move the PCI I/O region above the vmemmap region in the kernel's VA space. This will permit us to reclaim the lower part of the vmemmap region for vmalloc/vmap allocations when running a 52-bit VA capable build on a 48-bit VA capable system. Also, given that PCI_IO_START is derived from VMEMMAP_END, use that symbolic constant directly in ptdump rather than deriving it from VMEMMAP_START and VMEMMAP_SIZE, as those definitions will change in subsequent patches. Signed-off-by: Ard Biesheuvel <ardb@kernel.org> Link: https://lore.kernel.org/r/20231213084024.2367360-10-ardb@google.com Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Acked-by: Mark Rutland <mark.rutland@arm.com>
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@ -49,8 +49,8 @@
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#define MODULES_VSIZE (SZ_2G)
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#define VMEMMAP_START (-(UL(1) << (VA_BITS - VMEMMAP_SHIFT)))
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#define VMEMMAP_END (VMEMMAP_START + VMEMMAP_SIZE)
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#define PCI_IO_END (VMEMMAP_START - SZ_8M)
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#define PCI_IO_START (PCI_IO_END - PCI_IO_SIZE)
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#define PCI_IO_START (VMEMMAP_END + SZ_8M)
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#define PCI_IO_END (PCI_IO_START + PCI_IO_SIZE)
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#define FIXADDR_TOP (VMEMMAP_START - SZ_32M)
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#if VA_BITS > 48
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@ -47,10 +47,10 @@ static struct addr_marker address_markers[] = {
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{ VMALLOC_END, "vmalloc() end" },
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{ FIXADDR_TOT_START, "Fixmap start" },
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{ FIXADDR_TOP, "Fixmap end" },
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{ VMEMMAP_START, "vmemmap start" },
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{ VMEMMAP_END, "vmemmap end" },
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{ PCI_IO_START, "PCI I/O start" },
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{ PCI_IO_END, "PCI I/O end" },
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{ VMEMMAP_START, "vmemmap start" },
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{ VMEMMAP_START + VMEMMAP_SIZE, "vmemmap end" },
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{ -1, NULL },
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};
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