mirror of
https://github.com/torvalds/linux
synced 2024-11-05 18:23:50 +00:00
d93e4d7d72
This avoids an extra find_vma() and is less error-prone. Signed-off-by: Becky Bruce <beckyb@kernel.crashing.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
122 lines
2.8 KiB
C
122 lines
2.8 KiB
C
/*
|
|
* PPC Huge TLB Page Support for Book3E MMU
|
|
*
|
|
* Copyright (C) 2009 David Gibson, IBM Corporation.
|
|
* Copyright (C) 2011 Becky Bruce, Freescale Semiconductor
|
|
*
|
|
*/
|
|
#include <linux/mm.h>
|
|
#include <linux/hugetlb.h>
|
|
|
|
static inline int mmu_get_tsize(int psize)
|
|
{
|
|
return mmu_psize_defs[psize].enc;
|
|
}
|
|
|
|
static inline int book3e_tlb_exists(unsigned long ea, unsigned long pid)
|
|
{
|
|
int found = 0;
|
|
|
|
mtspr(SPRN_MAS6, pid << 16);
|
|
if (mmu_has_feature(MMU_FTR_USE_TLBRSRV)) {
|
|
asm volatile(
|
|
"li %0,0\n"
|
|
"tlbsx. 0,%1\n"
|
|
"bne 1f\n"
|
|
"li %0,1\n"
|
|
"1:\n"
|
|
: "=&r"(found) : "r"(ea));
|
|
} else {
|
|
asm volatile(
|
|
"tlbsx 0,%1\n"
|
|
"mfspr %0,0x271\n"
|
|
"srwi %0,%0,31\n"
|
|
: "=&r"(found) : "r"(ea));
|
|
}
|
|
|
|
return found;
|
|
}
|
|
|
|
void book3e_hugetlb_preload(struct vm_area_struct *vma, unsigned long ea,
|
|
pte_t pte)
|
|
{
|
|
unsigned long mas1, mas2;
|
|
u64 mas7_3;
|
|
unsigned long psize, tsize, shift;
|
|
unsigned long flags;
|
|
struct mm_struct *mm;
|
|
|
|
#ifdef CONFIG_PPC_FSL_BOOK3E
|
|
int index, ncams;
|
|
#endif
|
|
|
|
if (unlikely(is_kernel_addr(ea)))
|
|
return;
|
|
|
|
mm = vma->vm_mm;
|
|
|
|
#ifdef CONFIG_PPC_MM_SLICES
|
|
psize = get_slice_psize(mm, ea);
|
|
tsize = mmu_get_tsize(psize);
|
|
shift = mmu_psize_defs[psize].shift;
|
|
#else
|
|
psize = vma_mmu_pagesize(vma);
|
|
shift = __ilog2(psize);
|
|
tsize = shift - 10;
|
|
#endif
|
|
|
|
/*
|
|
* We can't be interrupted while we're setting up the MAS
|
|
* regusters or after we've confirmed that no tlb exists.
|
|
*/
|
|
local_irq_save(flags);
|
|
|
|
if (unlikely(book3e_tlb_exists(ea, mm->context.id))) {
|
|
local_irq_restore(flags);
|
|
return;
|
|
}
|
|
|
|
#ifdef CONFIG_PPC_FSL_BOOK3E
|
|
ncams = mfspr(SPRN_TLB1CFG) & TLBnCFG_N_ENTRY;
|
|
|
|
/* We have to use the CAM(TLB1) on FSL parts for hugepages */
|
|
index = __get_cpu_var(next_tlbcam_idx);
|
|
mtspr(SPRN_MAS0, MAS0_ESEL(index) | MAS0_TLBSEL(1));
|
|
|
|
/* Just round-robin the entries and wrap when we hit the end */
|
|
if (unlikely(index == ncams - 1))
|
|
__get_cpu_var(next_tlbcam_idx) = tlbcam_index;
|
|
else
|
|
__get_cpu_var(next_tlbcam_idx)++;
|
|
#endif
|
|
mas1 = MAS1_VALID | MAS1_TID(mm->context.id) | MAS1_TSIZE(tsize);
|
|
mas2 = ea & ~((1UL << shift) - 1);
|
|
mas2 |= (pte_val(pte) >> PTE_WIMGE_SHIFT) & MAS2_WIMGE_MASK;
|
|
mas7_3 = (u64)pte_pfn(pte) << PAGE_SHIFT;
|
|
mas7_3 |= (pte_val(pte) >> PTE_BAP_SHIFT) & MAS3_BAP_MASK;
|
|
if (!pte_dirty(pte))
|
|
mas7_3 &= ~(MAS3_SW|MAS3_UW);
|
|
|
|
mtspr(SPRN_MAS1, mas1);
|
|
mtspr(SPRN_MAS2, mas2);
|
|
|
|
if (mmu_has_feature(MMU_FTR_USE_PAIRED_MAS)) {
|
|
mtspr(SPRN_MAS7_MAS3, mas7_3);
|
|
} else {
|
|
mtspr(SPRN_MAS7, upper_32_bits(mas7_3));
|
|
mtspr(SPRN_MAS3, lower_32_bits(mas7_3));
|
|
}
|
|
|
|
asm volatile ("tlbwe");
|
|
|
|
local_irq_restore(flags);
|
|
}
|
|
|
|
void flush_hugetlb_page(struct vm_area_struct *vma, unsigned long vmaddr)
|
|
{
|
|
struct hstate *hstate = hstate_file(vma->vm_file);
|
|
unsigned long tsize = huge_page_shift(hstate) - 10;
|
|
|
|
__flush_tlb_page(vma ? vma->vm_mm : NULL, vmaddr, tsize, 0);
|
|
|
|
}
|