Commit 324420bf authored by Ard Biesheuvel's avatar Ard Biesheuvel Committed by Catalin Marinas
Browse files

arm64: add support for ioremap() block mappings 



This wires up the existing generic huge-vmap feature, which allows
ioremap() to use PMD or PUD sized block mappings. It also adds support
to the unmap path for dealing with block mappings, which will allow us
to unmap the __init region using unmap_kernel_range() in a subsequent
patch.

Signed-off-by: default avatarArd Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
parent 03336b1d

Documentation/features/vm/huge-vmap/arch-support.txt

+1 −1
Original line number Diff line number Diff line
@@ -9,7 +9,7 @@ 
    |       alpha: | TODO |

    |         arc: | TODO |

    |         arm: | TODO |

    |       arm64: | TODO |

    |       arm64: |  ok  |

    |       avr32: | TODO |

    |    blackfin: | TODO |

    |         c6x: | TODO |

arch/arm64/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -50,6 +50,7 @@ config ARM64 
	select HAVE_ALIGNED_STRUCT_PAGE if SLUB

	select HAVE_ARCH_AUDITSYSCALL

	select HAVE_ARCH_BITREVERSE

	select HAVE_ARCH_HUGE_VMAP

	select HAVE_ARCH_JUMP_LABEL

	select HAVE_ARCH_KASAN if SPARSEMEM_VMEMMAP && !(ARM64_16K_PAGES && ARM64_VA_BITS_48)

	select HAVE_ARCH_KGDB

arch/arm64/include/asm/memory.h

+6 −0
Original line number Diff line number Diff line
@@ -100,6 +100,12 @@ 
#define MT_S2_NORMAL		0xf

#define MT_S2_DEVICE_nGnRE	0x1



#ifdef CONFIG_ARM64_4K_PAGES

#define IOREMAP_MAX_ORDER	(PUD_SHIFT)

#else

#define IOREMAP_MAX_ORDER	(PMD_SHIFT)

#endif



#ifndef __ASSEMBLY__



extern phys_addr_t		memstart_addr;

arch/arm64/mm/mmu.c

+41 −0
Original line number Diff line number Diff line
@@ -747,3 +747,44 @@ void *__init fixmap_remap_fdt(phys_addr_t dt_phys) 


	return dt_virt;

}



int __init arch_ioremap_pud_supported(void)

{

	/* only 4k granule supports level 1 block mappings */

	return IS_ENABLED(CONFIG_ARM64_4K_PAGES);

}



int __init arch_ioremap_pmd_supported(void)

{

	return 1;

}



int pud_set_huge(pud_t *pud, phys_addr_t phys, pgprot_t prot)

{

	BUG_ON(phys & ~PUD_MASK);

	set_pud(pud, __pud(phys | PUD_TYPE_SECT | pgprot_val(mk_sect_prot(prot))));

	return 1;

}



int pmd_set_huge(pmd_t *pmd, phys_addr_t phys, pgprot_t prot)

{

	BUG_ON(phys & ~PMD_MASK);

	set_pmd(pmd, __pmd(phys | PMD_TYPE_SECT | pgprot_val(mk_sect_prot(prot))));

	return 1;

}



int pud_clear_huge(pud_t *pud)

{

	if (!pud_sect(*pud))

		return 0;

	pud_clear(pud);

	return 1;

}



int pmd_clear_huge(pmd_t *pmd)

{

	if (!pmd_sect(*pmd))

		return 0;

	pmd_clear(pmd);

	return 1;

}

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