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author | Mark Rutland <mark.rutland@arm.com> | 2015-01-15 16:42:14 (GMT) |
---|---|---|
committer | Catalin Marinas <catalin.marinas@arm.com> | 2015-01-16 16:21:58 (GMT) |
commit | 6083fe74b7bfffc2c7be8c711596608bda0cda6e (patch) | |
tree | 2a7b9401b1d12ff52ee38645f8156a91a6c4cccf /arch/arm64/mm/init.c | |
parent | 7fe5d2b1daf6fd82857a8d0ee47547d7852ebe7b (diff) | |
download | linux-6083fe74b7bfffc2c7be8c711596608bda0cda6e.tar.xz |
arm64: respect mem= for EFI
When booting with EFI, we acquire the EFI memory map after parsing the
early params. This unfortuantely renders the option useless as we call
memblock_enforce_memory_limit (which uses memblock_remove_range behind
the scenes) before we've added any memblocks. We end up removing
nothing, then adding all of memory later when efi_init calls
reserve_regions.
Instead, we can log the limit and apply this later when we do the rest
of the memblock work in memblock_init, which should work regardless of
the presence of EFI. At the same time we may as well move the early
parameter into arm64's mm/init.c, close to arm64_memblock_init.
Any memory which must be mapped (e.g. for use by EFI runtime services)
must be mapped explicitly reather than relying on the linear mapping,
which may be truncated as a result of a mem= option passed on the kernel
command line.
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Tested-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Leif Lindholm <leif.lindholm@linaro.org>
Cc: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'arch/arm64/mm/init.c')
-rw-r--r-- | arch/arm64/mm/init.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c index bac492c..11c7b70 100644 --- a/arch/arm64/mm/init.c +++ b/arch/arm64/mm/init.c @@ -136,10 +136,29 @@ static void arm64_memory_present(void) } #endif +static phys_addr_t memory_limit = (phys_addr_t)ULLONG_MAX; + +/* + * Limit the memory size that was specified via FDT. + */ +static int __init early_mem(char *p) +{ + if (!p) + return 1; + + memory_limit = memparse(p, &p) & PAGE_MASK; + pr_notice("Memory limited to %lldMB\n", memory_limit >> 20); + + return 0; +} +early_param("mem", early_mem); + void __init arm64_memblock_init(void) { phys_addr_t dma_phys_limit = 0; + memblock_enforce_memory_limit(memory_limit); + /* * Register the kernel text, kernel data, initrd, and initial * pagetables with memblock. |