xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

powerpc/64s/hash: remove user SLB data from the paca

Browse Source 
User SLB mappig data is copied into the PACA from the mm->context so
it can be accessed by the SLB miss handlers.

After the C conversion, SLB miss handlers now run with relocation on,
and user SLB misses are able to take recursive kernel SLB misses, so
the user SLB mapping data can be removed from the paca and accessed
directly.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Nicholas Piggin
2018-09-15 01:30:52 +10:00
committed by Michael Ellerman
parent 5e46e29e6a
commit 8fed04d0f6
8 changed files with 40 additions and 103 deletions
Download Patch File Download Diff File Expand all files Collapse all files

29
arch/powerpc/mm/slice.c
View File

@@ -207,23 +207,6 @@ static bool slice_check_range_fits(struct mm_struct *mm,
return true;
}
static void slice_flush_segments(void *parm)
{
#ifdef CONFIG_PPC64
struct mm_struct *mm = parm;
unsigned long flags;
if (mm != current->active_mm)
return;
copy_mm_to_paca(current->active_mm);
local_irq_save(flags);
slb_flush_and_rebolt();
local_irq_restore(flags);
#endif
}
static void slice_convert(struct mm_struct *mm,
const struct slice_mask *mask, int psize)
{
@@ -289,6 +272,9 @@ static void slice_convert(struct mm_struct *mm,
spin_unlock_irqrestore(&slice_convert_lock, flags);
copro_flush_all_slbs(mm);
#ifdef CONFIG_PPC64
core_flush_all_slbs(mm);
#endif
}
/*
@@ -502,8 +488,9 @@ unsigned long slice_get_unmapped_area(unsigned long addr, unsigned long len,
* be already initialised beyond the old address limit.
*/
mm->context.slb_addr_limit = high_limit;
on_each_cpu(slice_flush_segments, mm, 1);
#ifdef CONFIG_PPC64
core_flush_all_slbs(mm);
#endif
}
/* Sanity checks */
@@ -665,8 +652,10 @@ unsigned long slice_get_unmapped_area(unsigned long addr, unsigned long len,
(SLICE_NUM_HIGH &&
!bitmap_empty(potential_mask.high_slices, SLICE_NUM_HIGH))) {
slice_convert(mm, &potential_mask, psize);
#ifdef CONFIG_PPC64
if (psize > MMU_PAGE_BASE)
on_each_cpu(slice_flush_segments, mm, 1);
core_flush_all_slbs(mm);
#endif
}
return newaddr;