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Subject[PATCH v13 0/3] Fix issues with huge mapping in ioremap for ARM64
Date
This series of patches re-bring huge vmap back for arm64.

Patch 1/3 has been taken by Toshi in his series of patches
by name "[PATCH v3 0/3] fix free pmd/pte page handlings on x86"
to avoid merge conflict with this series.

These patches are tested on 4.16 kernel with Cortex-A75 based SoC.

The test used for verifying these patches is a stress test on
ioremap/unmap which tries to re-use same io-address but changes
size of mapping randomly i.e. 4K to 2M to 1G etc. The same test
used to reproduce 3rd level translation fault without these fixes
(and also of course with Revert "arm64: Enforce BBM for huge IO/VMAP
mappings" being part of the tree).

These patches can also go into '-stable' branch (if accepted)
for 4.6 onwards.

From V12->V13:
- Dropped v12 3/5 and v12 5/5
- Using existing APIs like pte_offset_kernel and pmd_offset
instead of pmd_page_vaddr & pud_page_vaddr
- Updated commit log message for 3/3
- Some other cosmetic corrections in 3/3

From V11->V12:
- Introduced p*d_page_vaddr helper macros and using them
- Rebased over current tip

From V10->V11:
- Updated pud_free_pmd_page & pmd_free_pte_page to use consistent
conding style
- Fixed few bugs by using pmd_page_paddr & pud_page_paddr

From V9->V10:
- Updated commit log for patch 1/4 by Toshi
- Addressed review comments by Will on patch 3/4

From V8->V9:
- Used __TLBI_VADDR macros in new TLB flush API

From V7->V8:
- Properly fixed compilation issue in x86 file

From V6->V7:
- Fixed compilation issue in x86 case
- V6 patches were not properly enumarated

From V5->V6:
- Use __flush_tlb_kernel_pgtable() for both PUD and PMD. Remove
"bool tlb_inv" based variance as it is not need now
- Re-naming for consistency

From V4->V5:
- Add new API __flush_tlb_kernel_pgtable(unsigned long addr)
for kernel addresses

From V3->V4:
- Add header for 'addr' in x86 implementation
- Re-order pmd/pud clear and table free
- Avoid redundant TLB invalidatation in one perticular case

From V2->V3:
- Use the exisiting page table free interface to do arm64
specific things

From V1->V2:
- Rebased my patches on top of "[PATCH v2 1/2] mm/vmalloc:
Add interfaces to free unmapped page table"
- Honored BBM for ARM64


Chintan Pandya (3):
ioremap: Update pgtable free interfaces with addr
arm64: tlbflush: Introduce __flush_tlb_kernel_pgtable
arm64: Implement page table free interfaces

arch/arm64/include/asm/tlbflush.h | 7 ++++++
arch/arm64/mm/mmu.c | 48 +++++++++++++++++++++++++++++++++++----
arch/x86/mm/pgtable.c | 8 ++++---
include/asm-generic/pgtable.h | 8 +++----
lib/ioremap.c | 4 ++--
5 files changed, 62 insertions(+), 13 deletions(-)

--
Qualcomm India Private Limited, on behalf of Qualcomm Innovation
Center, Inc., is a member of Code Aurora Forum, a Linux Foundation
Collaborative Project

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