diff options
| author | Philip Elcan <pelcan@codeaurora.org> | 2018-03-28 04:55:32 +0300 |
|---|---|---|
| committer | Will Deacon <will.deacon@arm.com> | 2018-03-28 17:20:17 +0300 |
| commit | 7f170499f734c417290518aa50cac11953bf8161 (patch) | |
| tree | 57430fc906fc301e499c2beadb8df75b1c6f50be /arch/arm64/include | |
| parent | 2a58fca9a7b4a3953c3e983ef80e36df85293a7c (diff) | |
| download | linux-7f170499f734c417290518aa50cac11953bf8161.tar.xz | |
arm64: tlbflush: avoid writing RES0 bits
Several of the bits of the TLBI register operand are RES0 per the ARM
ARM, so TLBI operations should avoid writing non-zero values to these
bits.
This patch adds a macro __TLBI_VADDR(addr, asid) that creates the
operand register in the correct format and honors the RES0 bits.
Acked-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Philip Elcan <pelcan@codeaurora.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'arch/arm64/include')
| -rw-r--r-- | arch/arm64/include/asm/tlbflush.h | 25 |
1 files changed, 17 insertions, 8 deletions
diff --git a/arch/arm64/include/asm/tlbflush.h b/arch/arm64/include/asm/tlbflush.h index 9e82dd79c7db..dfc61d73f740 100644 --- a/arch/arm64/include/asm/tlbflush.h +++ b/arch/arm64/include/asm/tlbflush.h @@ -60,6 +60,15 @@ __tlbi(op, (arg) | USER_ASID_FLAG); \ } while (0) +/* This macro creates a properly formatted VA operand for the TLBI */ +#define __TLBI_VADDR(addr, asid) \ + ({ \ + unsigned long __ta = (addr) >> 12; \ + __ta &= GENMASK_ULL(43, 0); \ + __ta |= (unsigned long)(asid) << 48; \ + __ta; \ + }) + /* * TLB Management * ============== @@ -117,7 +126,7 @@ static inline void flush_tlb_all(void) static inline void flush_tlb_mm(struct mm_struct *mm) { - unsigned long asid = ASID(mm) << 48; + unsigned long asid = __TLBI_VADDR(0, ASID(mm)); dsb(ishst); __tlbi(aside1is, asid); @@ -128,7 +137,7 @@ static inline void flush_tlb_mm(struct mm_struct *mm) static inline void flush_tlb_page(struct vm_area_struct *vma, unsigned long uaddr) { - unsigned long addr = uaddr >> 12 | (ASID(vma->vm_mm) << 48); + unsigned long addr = __TLBI_VADDR(uaddr, ASID(vma->vm_mm)); dsb(ishst); __tlbi(vale1is, addr); @@ -146,7 +155,7 @@ static inline void __flush_tlb_range(struct vm_area_struct *vma, unsigned long start, unsigned long end, bool last_level) { - unsigned long asid = ASID(vma->vm_mm) << 48; + unsigned long asid = ASID(vma->vm_mm); unsigned long addr; if ((end - start) > MAX_TLB_RANGE) { @@ -154,8 +163,8 @@ static inline void __flush_tlb_range(struct vm_area_struct *vma, return; } - start = asid | (start >> 12); - end = asid | (end >> 12); + start = __TLBI_VADDR(start, asid); + end = __TLBI_VADDR(end, asid); dsb(ishst); for (addr = start; addr < end; addr += 1 << (PAGE_SHIFT - 12)) { @@ -185,8 +194,8 @@ static inline void flush_tlb_kernel_range(unsigned long start, unsigned long end return; } - start >>= 12; - end >>= 12; + start = __TLBI_VADDR(start, 0); + end = __TLBI_VADDR(end, 0); dsb(ishst); for (addr = start; addr < end; addr += 1 << (PAGE_SHIFT - 12)) @@ -202,7 +211,7 @@ static inline void flush_tlb_kernel_range(unsigned long start, unsigned long end static inline void __flush_tlb_pgtable(struct mm_struct *mm, unsigned long uaddr) { - unsigned long addr = uaddr >> 12 | (ASID(mm) << 48); + unsigned long addr = __TLBI_VADDR(uaddr, ASID(mm)); __tlbi(vae1is, addr); __tlbi_user(vae1is, addr); |