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arm64: Add HAVE_IOREMAP_PROT support

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With ioremap_prot() definition from generic ioremap, also move
pte_pgprot() from hugetlbpage.c into pgtable.h, then arm64 could
have HAVE_IOREMAP_PROT, which will enable generic_access_phys()
code, it is useful for debug, eg, gdb.

Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Reviewed-by: Anshuman Khandual <anshuman.khandual@arm.com>
Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Link: https://lore.kernel.org/r/20220607125027.44946-7-wangkefeng.wang@huawei.com
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Kefeng Wang 2022-06-07 20:50:27 +08:00 committed by Will Deacon
parent f23eab0bfa
commit 893dea9ccd
4 changed files with 12 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
Documentation/features/vm/ioremap_prot/arch-support.txt
View File

@ -9,7 +9,7 @@
| alpha: | TODO |
| arc: | ok |
| arm: | TODO |
| arm64: | TODO |
| arm64: | ok |
| csky: | TODO |
| hexagon: | TODO |
| ia64: | TODO |

1
arch/arm64/Kconfig
View File

@ -189,6 +189,7 @@ config ARM64
select HAVE_FUNCTION_GRAPH_TRACER
select HAVE_GCC_PLUGINS
select HAVE_HW_BREAKPOINT if PERF_EVENTS
select HAVE_IOREMAP_PROT
select HAVE_IRQ_TIME_ACCOUNTING
select HAVE_KVM
select HAVE_NMI

10
arch/arm64/include/asm/pgtable.h
View File

@ -427,6 +427,16 @@ static inline pte_t pte_swp_clear_exclusive(pte_t pte)
return clear_pte_bit(pte, __pgprot(PTE_SWP_EXCLUSIVE));
}
/*
* Select all bits except the pfn
*/
static inline pgprot_t pte_pgprot(pte_t pte)
{
unsigned long pfn = pte_pfn(pte);
return __pgprot(pte_val(pfn_pte(pfn, __pgprot(0))) ^ pte_val(pte));
}
#ifdef CONFIG_NUMA_BALANCING
/*
* See the comment in include/linux/pgtable.h

10
arch/arm64/mm/hugetlbpage.c
View File

@ -100,16 +100,6 @@ int pud_huge(pud_t pud)
#endif
}
/*
* Select all bits except the pfn
*/
static inline pgprot_t pte_pgprot(pte_t pte)
{
unsigned long pfn = pte_pfn(pte);
return __pgprot(pte_val(pfn_pte(pfn, __pgprot(0))) ^ pte_val(pte));
}
static int find_num_contig(struct mm_struct *mm, unsigned long addr,
pte_t *ptep, size_t *pgsize)
{