diff options
| author | Will Deacon <will@kernel.org> | 2020-04-14 22:40:09 +0100 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2020-05-13 15:32:00 -0700 |
| commit | 8e958839e4b9fb6ea4385ff2c52d1333a3a618de (patch) | |
| tree | 487521d3d5161f12c348a62d97b35201e0131f28 /arch/sparc/include/asm/viking.h | |
| parent | ed894bf5a76357eb92045c79d6ae2f29814c6183 (diff) | |
| download | linux-8e958839e4b9fb6ea4385ff2c52d1333a3a618de.tar.bz2 | |
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/viking.h')
| -rw-r--r-- | arch/sparc/include/asm/viking.h | 5 |
1 files changed, 3 insertions, 2 deletions
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); } |