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arm64: Force SPARSEMEM_VMEMMAP as the only memory management model

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Currently arm64 allows a choice of FLATMEM, SPARSEMEM and
SPARSEMEM_VMEMMAP. However, only the latter is tested regularly. FLATMEM
does not seem to boot in certain configurations (guest under KVM with
Qemu as a VMM). Since the reduction of the SECTION_SIZE_BITS to 27 (4K
pages) or 29 (64K page), there's little argument against the memory
wasted by the mem_map array with SPARSEMEM.

Make SPARSEMEM_VMEMMAP the only available option, non-selectable, and
remove the corresponding #ifdefs under arch/arm64/.

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will@kernel.org>
Acked-by: Will Deacon <will@kernel.org>
Acked-by: Ard Biesheuvel <ardb@kernel.org>
Acked-by: Marc Zyngier <maz@kernel.org>
Reviewed-by: Anshuman Khandual <anshuman.khandual@arm.com>
Acked-by: Mike Rapoport <rppt@linux.ibm.com>
Link: https://lore.kernel.org/r/20210420093559.23168-1-catalin.marinas@arm.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Catalin Marinas 2021-04-20 10:35:59 +01:00
parent ef94340583
commit 782276b4d0
7 changed files with 6 additions and 25 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
arch/arm64/Kconfig
View File

@ -1040,15 +1040,7 @@ source "kernel/Kconfig.hz"
config ARCH_SPARSEMEM_ENABLE
def_bool y
select SPARSEMEM_VMEMMAP_ENABLE
config ARCH_SPARSEMEM_DEFAULT
def_bool ARCH_SPARSEMEM_ENABLE
config ARCH_SELECT_MEMORY_MODEL
def_bool ARCH_SPARSEMEM_ENABLE
config ARCH_FLATMEM_ENABLE
def_bool !NUMA
select SPARSEMEM_VMEMMAP
config HW_PERF_EVENTS
def_bool y

2
arch/arm64/include/asm/kernel-pgtable.h
View File

@ -136,7 +136,7 @@
* has a direct correspondence, and needs to appear sufficiently aligned
* in the virtual address space.
*/
#if defined(CONFIG_SPARSEMEM_VMEMMAP) && ARM64_MEMSTART_SHIFT < SECTION_SIZE_BITS
#if ARM64_MEMSTART_SHIFT < SECTION_SIZE_BITS
#define ARM64_MEMSTART_ALIGN (1UL << SECTION_SIZE_BITS)
#else
#define ARM64_MEMSTART_ALIGN (1UL << ARM64_MEMSTART_SHIFT)

4
arch/arm64/include/asm/memory.h
View File

@ -329,7 +329,7 @@ static inline void *phys_to_virt(phys_addr_t x)
*/
#define ARCH_PFN_OFFSET ((unsigned long)PHYS_PFN_OFFSET)
#if !defined(CONFIG_SPARSEMEM_VMEMMAP) || defined(CONFIG_DEBUG_VIRTUAL)
#if defined(CONFIG_DEBUG_VIRTUAL)
#define page_to_virt(x) ({ \
__typeof__(x) __page = x; \
void *__addr = __va(page_to_phys(__page)); \
@ -349,7 +349,7 @@ static inline void *phys_to_virt(phys_addr_t x)
u64 __addr = VMEMMAP_START + (__idx * sizeof(struct page)); \
(struct page *)__addr; \
})
#endif /* !CONFIG_SPARSEMEM_VMEMMAP || CONFIG_DEBUG_VIRTUAL */
#endif /* CONFIG_DEBUG_VIRTUAL */
#define virt_addr_valid(addr) ({ \
__typeof__(addr) __addr = __tag_reset(addr); \

3
arch/arm64/include/asm/sparsemem.h
View File

@ -5,7 +5,6 @@
#ifndef __ASM_SPARSEMEM_H
#define __ASM_SPARSEMEM_H
#ifdef CONFIG_SPARSEMEM
#define MAX_PHYSMEM_BITS CONFIG_ARM64_PA_BITS
/*
@ -27,6 +26,4 @@
#define SECTION_SIZE_BITS 27
#endif /* CONFIG_ARM64_64K_PAGES */
#endif /* CONFIG_SPARSEMEM*/
#endif

8
arch/arm64/mm/init.c
View File

@ -220,6 +220,7 @@ static void __init zone_sizes_init(unsigned long min, unsigned long max)
int pfn_valid(unsigned long pfn)
{
phys_addr_t addr = PFN_PHYS(pfn);
struct mem_section *ms;
/*
* Ensure the upper PAGE_SHIFT bits are clear in the
@ -230,10 +231,6 @@ int pfn_valid(unsigned long pfn)
if (PHYS_PFN(addr) != pfn)
return 0;
#ifdef CONFIG_SPARSEMEM
{
struct mem_section *ms;
if (pfn_to_section_nr(pfn) >= NR_MEM_SECTIONS)
return 0;
@ -252,8 +249,7 @@ int pfn_valid(unsigned long pfn)
*/
if (!early_section(ms))
return pfn_section_valid(ms, pfn);
}
#endif
return memblock_is_map_memory(addr);
}
EXPORT_SYMBOL(pfn_valid);

2
arch/arm64/mm/mmu.c
View File

@ -1113,7 +1113,6 @@ static void free_empty_tables(unsigned long addr, unsigned long end,
}
#endif
#ifdef CONFIG_SPARSEMEM_VMEMMAP
#if !ARM64_SWAPPER_USES_SECTION_MAPS
int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node,
struct vmem_altmap *altmap)
@ -1177,7 +1176,6 @@ void vmemmap_free(unsigned long start, unsigned long end,
free_empty_tables(start, end, VMEMMAP_START, VMEMMAP_END);
#endif
}
#endif /* CONFIG_SPARSEMEM_VMEMMAP */
static inline pud_t *fixmap_pud(unsigned long addr)
{

2
arch/arm64/mm/ptdump.c
View File

@ -51,10 +51,8 @@ static struct addr_marker address_markers[] = {
{ FIXADDR_TOP, "Fixmap end" },
{ PCI_IO_START, "PCI I/O start" },
{ PCI_IO_END, "PCI I/O end" },
#ifdef CONFIG_SPARSEMEM_VMEMMAP
{ VMEMMAP_START, "vmemmap start" },
{ VMEMMAP_START + VMEMMAP_SIZE, "vmemmap end" },
#endif
{ -1, NULL },
};