diff options
author | Will Deacon <will@kernel.org> | 2020-04-15 00:40:09 +0300 |
---|---|---|
committer | David S. Miller <davem@davemloft.net> | 2020-05-14 01:32:00 +0300 |
commit | 8e958839e4b9fb6ea4385ff2c52d1333a3a618de (patch) | |
tree | 487521d3d5161f12c348a62d97b35201e0131f28 /arch/sparc/include/asm | |
parent | ed894bf5a76357eb92045c79d6ae2f29814c6183 (diff) | |
download | linux-8e958839e4b9fb6ea4385ff2c52d1333a3a618de.tar.xz |
sparc32: mm: Restructure sparc32 MMU page-table layout
The "SRMMU" supports 4k pages using a fixed three-level walk with a
256-entry PGD and 64-entry PMD/PTE levels. In order to fill a page
with a 'pgtable_t', the SRMMU code allocates four native PTE tables
into a single PTE allocation and similarly for the PMD level, leading
to an array of 16 physical pointers in a 'pmd_t'
This breaks the generic code which assumes READ_ONCE(*pmd) will be
word sized.
In a manner similar to ef22d8abd876 ("m68k: mm: Restructure Motorola
MMU page-table layout"), this patch implements the native page-table
setup directly. This significantly increases the page-table memory
overhead, but will be addresses in a subsequent patch.
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'arch/sparc/include/asm')
-rw-r--r-- | arch/sparc/include/asm/page_32.h | 10 | ||||
-rw-r--r-- | arch/sparc/include/asm/pgalloc_32.h | 5 | ||||
-rw-r--r-- | arch/sparc/include/asm/pgtable_32.h | 29 | ||||
-rw-r--r-- | arch/sparc/include/asm/pgtsrmmu.h | 36 | ||||
-rw-r--r-- | arch/sparc/include/asm/viking.h | 5 |
5 files changed, 29 insertions, 56 deletions
diff --git a/arch/sparc/include/asm/page_32.h b/arch/sparc/include/asm/page_32.h index 478260002836..da01c8c45412 100644 --- a/arch/sparc/include/asm/page_32.h +++ b/arch/sparc/include/asm/page_32.h @@ -54,7 +54,7 @@ extern struct sparc_phys_banks sp_banks[SPARC_PHYS_BANKS+1]; */ typedef struct { unsigned long pte; } pte_t; typedef struct { unsigned long iopte; } iopte_t; -typedef struct { unsigned long pmdv[16]; } pmd_t; +typedef struct { unsigned long pmd; } pmd_t; typedef struct { unsigned long pgd; } pgd_t; typedef struct { unsigned long ctxd; } ctxd_t; typedef struct { unsigned long pgprot; } pgprot_t; @@ -62,7 +62,7 @@ typedef struct { unsigned long iopgprot; } iopgprot_t; #define pte_val(x) ((x).pte) #define iopte_val(x) ((x).iopte) -#define pmd_val(x) ((x).pmdv[0]) +#define pmd_val(x) ((x).pmd) #define pgd_val(x) ((x).pgd) #define ctxd_val(x) ((x).ctxd) #define pgprot_val(x) ((x).pgprot) @@ -82,7 +82,7 @@ typedef struct { unsigned long iopgprot; } iopgprot_t; */ typedef unsigned long pte_t; typedef unsigned long iopte_t; -typedef struct { unsigned long pmdv[16]; } pmd_t; +typedef unsigned long pmd_t; typedef unsigned long pgd_t; typedef unsigned long ctxd_t; typedef unsigned long pgprot_t; @@ -90,14 +90,14 @@ typedef unsigned long iopgprot_t; #define pte_val(x) (x) #define iopte_val(x) (x) -#define pmd_val(x) ((x).pmdv[0]) +#define pmd_val(x) (x) #define pgd_val(x) (x) #define ctxd_val(x) (x) #define pgprot_val(x) (x) #define iopgprot_val(x) (x) #define __pte(x) (x) -#define __pmd(x) ((pmd_t) { { (x) }, }) +#define __pmd(x) (x) #define __iopte(x) (x) #define __pgd(x) (x) #define __ctxd(x) (x) diff --git a/arch/sparc/include/asm/pgalloc_32.h b/arch/sparc/include/asm/pgalloc_32.h index eae0c92ec422..99c032424946 100644 --- a/arch/sparc/include/asm/pgalloc_32.h +++ b/arch/sparc/include/asm/pgalloc_32.h @@ -60,13 +60,14 @@ pgtable_t pte_alloc_one(struct mm_struct *mm); static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm) { - return srmmu_get_nocache(PTE_SIZE, PTE_SIZE); + return srmmu_get_nocache(SRMMU_PTE_TABLE_SIZE, + SRMMU_PTE_TABLE_SIZE); } static inline void free_pte_fast(pte_t *pte) { - srmmu_free_nocache(pte, PTE_SIZE); + srmmu_free_nocache(pte, SRMMU_PTE_TABLE_SIZE); } #define pte_free_kernel(mm, pte) free_pte_fast(pte) diff --git a/arch/sparc/include/asm/pgtable_32.h b/arch/sparc/include/asm/pgtable_32.h index 0de659ae0ba4..3367e2ba89e0 100644 --- a/arch/sparc/include/asm/pgtable_32.h +++ b/arch/sparc/include/asm/pgtable_32.h @@ -11,6 +11,16 @@ #include <linux/const.h> +#define PMD_SHIFT 18 +#define PMD_SIZE (1UL << PMD_SHIFT) +#define PMD_MASK (~(PMD_SIZE-1)) +#define PMD_ALIGN(__addr) (((__addr) + ~PMD_MASK) & PMD_MASK) + +#define PGDIR_SHIFT 24 +#define PGDIR_SIZE (1UL << PGDIR_SHIFT) +#define PGDIR_MASK (~(PGDIR_SIZE-1)) +#define PGDIR_ALIGN(__addr) (((__addr) + ~PGDIR_MASK) & PGDIR_MASK) + #ifndef __ASSEMBLY__ #include <asm-generic/pgtable-nopud.h> @@ -34,17 +44,10 @@ unsigned long __init bootmem_init(unsigned long *pages_avail); #define pmd_ERROR(e) __builtin_trap() #define pgd_ERROR(e) __builtin_trap() -#define PMD_SHIFT 22 -#define PMD_SIZE (1UL << PMD_SHIFT) -#define PMD_MASK (~(PMD_SIZE-1)) -#define PMD_ALIGN(__addr) (((__addr) + ~PMD_MASK) & PMD_MASK) -#define PGDIR_SHIFT SRMMU_PGDIR_SHIFT -#define PGDIR_SIZE SRMMU_PGDIR_SIZE -#define PGDIR_MASK SRMMU_PGDIR_MASK -#define PTRS_PER_PTE 1024 -#define PTRS_PER_PMD SRMMU_PTRS_PER_PMD -#define PTRS_PER_PGD SRMMU_PTRS_PER_PGD -#define USER_PTRS_PER_PGD PAGE_OFFSET / SRMMU_PGDIR_SIZE +#define PTRS_PER_PTE 64 +#define PTRS_PER_PMD 64 +#define PTRS_PER_PGD 256 +#define USER_PTRS_PER_PGD PAGE_OFFSET / PGDIR_SIZE #define FIRST_USER_ADDRESS 0UL #define PTE_SIZE (PTRS_PER_PTE*4) @@ -179,9 +182,7 @@ static inline int pmd_none(pmd_t pmd) static inline void pmd_clear(pmd_t *pmdp) { - int i; - for (i = 0; i < PTRS_PER_PTE/SRMMU_REAL_PTRS_PER_PTE; i++) - set_pte((pte_t *)&pmdp->pmdv[i], __pte(0)); + set_pte((pte_t *)&pmd_val(*pmdp), __pte(0)); } static inline int pud_none(pud_t pud) diff --git a/arch/sparc/include/asm/pgtsrmmu.h b/arch/sparc/include/asm/pgtsrmmu.h index 32a508897501..58ea8e8c6ee7 100644 --- a/arch/sparc/include/asm/pgtsrmmu.h +++ b/arch/sparc/include/asm/pgtsrmmu.h @@ -17,39 +17,9 @@ /* Number of contexts is implementation-dependent; 64k is the most we support */ #define SRMMU_MAX_CONTEXTS 65536 -/* PMD_SHIFT determines the size of the area a second-level page table entry can map */ -#define SRMMU_REAL_PMD_SHIFT 18 -#define SRMMU_REAL_PMD_SIZE (1UL << SRMMU_REAL_PMD_SHIFT) -#define SRMMU_REAL_PMD_MASK (~(SRMMU_REAL_PMD_SIZE-1)) -#define SRMMU_REAL_PMD_ALIGN(__addr) (((__addr)+SRMMU_REAL_PMD_SIZE-1)&SRMMU_REAL_PMD_MASK) - -/* PGDIR_SHIFT determines what a third-level page table entry can map */ -#define SRMMU_PGDIR_SHIFT 24 -#define SRMMU_PGDIR_SIZE (1UL << SRMMU_PGDIR_SHIFT) -#define SRMMU_PGDIR_MASK (~(SRMMU_PGDIR_SIZE-1)) -#define SRMMU_PGDIR_ALIGN(addr) (((addr)+SRMMU_PGDIR_SIZE-1)&SRMMU_PGDIR_MASK) - -#define SRMMU_REAL_PTRS_PER_PTE 64 -#define SRMMU_REAL_PTRS_PER_PMD 64 -#define SRMMU_PTRS_PER_PGD 256 - -#define SRMMU_REAL_PTE_TABLE_SIZE (SRMMU_REAL_PTRS_PER_PTE*4) -#define SRMMU_PMD_TABLE_SIZE (SRMMU_REAL_PTRS_PER_PMD*4) -#define SRMMU_PGD_TABLE_SIZE (SRMMU_PTRS_PER_PGD*4) - -/* - * To support pagetables in highmem, Linux introduces APIs which - * return struct page* and generally manipulate page tables when - * they are not mapped into kernel space. Our hardware page tables - * are smaller than pages. We lump hardware tabes into big, page sized - * software tables. - * - * PMD_SHIFT determines the size of the area a second-level page table entry - * can map, and our pmd_t is 16 times larger than normal. The values which - * were once defined here are now generic for 4c and srmmu, so they're - * found in pgtable.h. - */ -#define SRMMU_PTRS_PER_PMD 4 +#define SRMMU_PTE_TABLE_SIZE (PAGE_SIZE) +#define SRMMU_PMD_TABLE_SIZE (PAGE_SIZE) +#define SRMMU_PGD_TABLE_SIZE (PTRS_PER_PGD*4) /* Definition of the values in the ET field of PTD's and PTE's */ #define SRMMU_ET_MASK 0x3 diff --git a/arch/sparc/include/asm/viking.h b/arch/sparc/include/asm/viking.h index 0bbefd184221..08ffc605035f 100644 --- a/arch/sparc/include/asm/viking.h +++ b/arch/sparc/include/asm/viking.h @@ -10,6 +10,7 @@ #include <asm/asi.h> #include <asm/mxcc.h> +#include <asm/pgtable.h> #include <asm/pgtsrmmu.h> /* Bits in the SRMMU control register for GNU/Viking modules. @@ -227,7 +228,7 @@ static inline unsigned long viking_hwprobe(unsigned long vaddr) : "=r" (val) : "r" (vaddr | 0x200), "i" (ASI_M_FLUSH_PROBE)); if ((val & SRMMU_ET_MASK) == SRMMU_ET_PTE) { - vaddr &= ~SRMMU_PGDIR_MASK; + vaddr &= ~PGDIR_MASK; vaddr >>= PAGE_SHIFT; return val | (vaddr << 8); } @@ -237,7 +238,7 @@ static inline unsigned long viking_hwprobe(unsigned long vaddr) : "=r" (val) : "r" (vaddr | 0x100), "i" (ASI_M_FLUSH_PROBE)); if ((val & SRMMU_ET_MASK) == SRMMU_ET_PTE) { - vaddr &= ~SRMMU_REAL_PMD_MASK; + vaddr &= ~PMD_MASK; vaddr >>= PAGE_SHIFT; return val | (vaddr << 8); } |