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riscv: add ARCH_SUPPORTS_DEBUG_PAGEALLOC support

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ARCH_SUPPORTS_DEBUG_PAGEALLOC provides a hook to map and unmap
pages for debugging purposes. Implement the __kernel_map_pages
functions to fill the poison pattern.

Signed-off-by: Zong Li <zong.li@sifive.com>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
This commit is contained in:
Zong Li 2020-03-10 00:55:38 +08:00 • committed by Palmer Dabbelt
parent 395a21ff85
commit 5fde3db5eb
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2 changed files with 16 additions and 0 deletions
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3
arch/riscv/Kconfig
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@ -131,6 +131,9 @@ config ARCH_SELECT_MEMORY_MODEL
config ARCH_WANT_GENERAL_HUGETLB config ARCH_WANT_GENERAL_HUGETLB
def_bool y def_bool y
config ARCH_SUPPORTS_DEBUG_PAGEALLOC
def_bool y
config SYS_SUPPORTS_HUGETLBFS config SYS_SUPPORTS_HUGETLBFS
def_bool y def_bool y

13
arch/riscv/mm/pageattr.c
View file

@ -172,3 +172,16 @@ int set_direct_map_default_noflush(struct page *page)
return walk_page_range(&init_mm, start, end, &pageattr_ops, &masks); return walk_page_range(&init_mm, start, end, &pageattr_ops, &masks);
} }
void __kernel_map_pages(struct page *page, int numpages, int enable)
{
if (!debug_pagealloc_enabled())
return;
if (enable)
__set_memory((unsigned long)page_address(page), numpages,
__pgprot(_PAGE_PRESENT), __pgprot(0));
else
__set_memory((unsigned long)page_address(page), numpages,
__pgprot(0), __pgprot(_PAGE_PRESENT));
}