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69111bac42
This still has not been merged and now powerpc is the only arch that does
not have this change. Sorry about missing linuxppc-dev before.
V2->V2
- Fix up to work against 3.18-rc1
__get_cpu_var() is used for multiple purposes in the kernel source. One of
them is address calculation via the form &__get_cpu_var(x). This calculates
the address for the instance of the percpu variable of the current processor
based on an offset.
Other use cases are for storing and retrieving data from the current
processors percpu area. __get_cpu_var() can be used as an lvalue when
writing data or on the right side of an assignment.
__get_cpu_var() is defined as :
__get_cpu_var() always only does an address determination. However, store
and retrieve operations could use a segment prefix (or global register on
other platforms) to avoid the address calculation.
this_cpu_write() and this_cpu_read() can directly take an offset into a
percpu area and use optimized assembly code to read and write per cpu
variables.
This patch converts __get_cpu_var into either an explicit address
calculation using this_cpu_ptr() or into a use of this_cpu operations that
use the offset. Thereby address calculations are avoided and less registers
are used when code is generated.
At the end of the patch set all uses of __get_cpu_var have been removed so
the macro is removed too.
The patch set includes passes over all arches as well. Once these operations
are used throughout then specialized macros can be defined in non -x86
arches as well in order to optimize per cpu access by f.e. using a global
register that may be set to the per cpu base.
Transformations done to __get_cpu_var()
1. Determine the address of the percpu instance of the current processor.
DEFINE_PER_CPU(int, y);
int *x = &__get_cpu_var(y);
Converts to
int *x = this_cpu_ptr(&y);
2. Same as #1 but this time an array structure is involved.
DEFINE_PER_CPU(int, y[20]);
int *x = __get_cpu_var(y);
Converts to
int *x = this_cpu_ptr(y);
3. Retrieve the content of the current processors instance of a per cpu
variable.
DEFINE_PER_CPU(int, y);
int x = __get_cpu_var(y)
Converts to
int x = __this_cpu_read(y);
4. Retrieve the content of a percpu struct
DEFINE_PER_CPU(struct mystruct, y);
struct mystruct x = __get_cpu_var(y);
Converts to
memcpy(&x, this_cpu_ptr(&y), sizeof(x));
5. Assignment to a per cpu variable
DEFINE_PER_CPU(int, y)
__get_cpu_var(y) = x;
Converts to
__this_cpu_write(y, x);
6. Increment/Decrement etc of a per cpu variable
DEFINE_PER_CPU(int, y);
__get_cpu_var(y)++
Converts to
__this_cpu_inc(y)
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
CC: Paul Mackerras <paulus@samba.org>
Signed-off-by: Christoph Lameter <cl@linux.com>
[mpe: Fix build errors caused by set/or_softirq_pending(), and rework
assignment in __set_breakpoint() to use memcpy().]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
176 lines
4.9 KiB
C
176 lines
4.9 KiB
C
#ifndef _ASM_POWERPC_TLBFLUSH_H
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#define _ASM_POWERPC_TLBFLUSH_H
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/*
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* TLB flushing:
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*
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* - flush_tlb_mm(mm) flushes the specified mm context TLB's
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* - flush_tlb_page(vma, vmaddr) flushes one page
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* - local_flush_tlb_mm(mm, full) flushes the specified mm context on
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* the local processor
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* - local_flush_tlb_page(vma, vmaddr) flushes one page on the local processor
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* - flush_tlb_page_nohash(vma, vmaddr) flushes one page if SW loaded TLB
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* - flush_tlb_range(vma, start, end) flushes a range of pages
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* - flush_tlb_kernel_range(start, end) flushes a range of kernel pages
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#ifdef __KERNEL__
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#ifdef CONFIG_PPC_MMU_NOHASH
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/*
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* TLB flushing for software loaded TLB chips
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*
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* TODO: (CONFIG_FSL_BOOKE) determine if flush_tlb_range &
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* flush_tlb_kernel_range are best implemented as tlbia vs
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* specific tlbie's
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*/
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struct vm_area_struct;
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struct mm_struct;
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#define MMU_NO_CONTEXT ((unsigned int)-1)
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extern void flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
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unsigned long end);
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extern void flush_tlb_kernel_range(unsigned long start, unsigned long end);
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extern void local_flush_tlb_mm(struct mm_struct *mm);
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extern void local_flush_tlb_page(struct vm_area_struct *vma, unsigned long vmaddr);
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extern void __local_flush_tlb_page(struct mm_struct *mm, unsigned long vmaddr,
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int tsize, int ind);
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#ifdef CONFIG_SMP
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extern void flush_tlb_mm(struct mm_struct *mm);
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extern void flush_tlb_page(struct vm_area_struct *vma, unsigned long vmaddr);
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extern void __flush_tlb_page(struct mm_struct *mm, unsigned long vmaddr,
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int tsize, int ind);
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#else
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#define flush_tlb_mm(mm) local_flush_tlb_mm(mm)
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#define flush_tlb_page(vma,addr) local_flush_tlb_page(vma,addr)
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#define __flush_tlb_page(mm,addr,p,i) __local_flush_tlb_page(mm,addr,p,i)
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#endif
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#define flush_tlb_page_nohash(vma,addr) flush_tlb_page(vma,addr)
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#elif defined(CONFIG_PPC_STD_MMU_32)
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/*
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* TLB flushing for "classic" hash-MMU 32-bit CPUs, 6xx, 7xx, 7xxx
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*/
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extern void flush_tlb_mm(struct mm_struct *mm);
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extern void flush_tlb_page(struct vm_area_struct *vma, unsigned long vmaddr);
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extern void flush_tlb_page_nohash(struct vm_area_struct *vma, unsigned long addr);
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extern void flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
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unsigned long end);
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extern void flush_tlb_kernel_range(unsigned long start, unsigned long end);
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static inline void local_flush_tlb_page(struct vm_area_struct *vma,
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unsigned long vmaddr)
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{
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flush_tlb_page(vma, vmaddr);
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}
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static inline void local_flush_tlb_mm(struct mm_struct *mm)
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{
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flush_tlb_mm(mm);
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}
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#elif defined(CONFIG_PPC_STD_MMU_64)
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#define MMU_NO_CONTEXT 0
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/*
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* TLB flushing for 64-bit hash-MMU CPUs
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*/
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#include <linux/percpu.h>
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#include <asm/page.h>
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#define PPC64_TLB_BATCH_NR 192
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struct ppc64_tlb_batch {
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int active;
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unsigned long index;
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struct mm_struct *mm;
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real_pte_t pte[PPC64_TLB_BATCH_NR];
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unsigned long vpn[PPC64_TLB_BATCH_NR];
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unsigned int psize;
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int ssize;
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};
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DECLARE_PER_CPU(struct ppc64_tlb_batch, ppc64_tlb_batch);
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extern void __flush_tlb_pending(struct ppc64_tlb_batch *batch);
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#define __HAVE_ARCH_ENTER_LAZY_MMU_MODE
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static inline void arch_enter_lazy_mmu_mode(void)
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{
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struct ppc64_tlb_batch *batch = this_cpu_ptr(&ppc64_tlb_batch);
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batch->active = 1;
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}
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static inline void arch_leave_lazy_mmu_mode(void)
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{
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struct ppc64_tlb_batch *batch = this_cpu_ptr(&ppc64_tlb_batch);
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if (batch->index)
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__flush_tlb_pending(batch);
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batch->active = 0;
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}
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#define arch_flush_lazy_mmu_mode() do {} while (0)
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extern void flush_hash_page(unsigned long vpn, real_pte_t pte, int psize,
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int ssize, int local);
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extern void flush_hash_range(unsigned long number, int local);
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static inline void local_flush_tlb_mm(struct mm_struct *mm)
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{
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}
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static inline void flush_tlb_mm(struct mm_struct *mm)
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{
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}
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static inline void local_flush_tlb_page(struct vm_area_struct *vma,
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unsigned long vmaddr)
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{
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}
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static inline void flush_tlb_page(struct vm_area_struct *vma,
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unsigned long vmaddr)
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{
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}
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static inline void flush_tlb_page_nohash(struct vm_area_struct *vma,
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unsigned long vmaddr)
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{
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}
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static inline void flush_tlb_range(struct vm_area_struct *vma,
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unsigned long start, unsigned long end)
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{
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}
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static inline void flush_tlb_kernel_range(unsigned long start,
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unsigned long end)
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{
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}
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/* Private function for use by PCI IO mapping code */
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extern void __flush_hash_table_range(struct mm_struct *mm, unsigned long start,
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unsigned long end);
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extern void flush_tlb_pmd_range(struct mm_struct *mm, pmd_t *pmd,
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unsigned long addr);
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#else
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#error Unsupported MMU type
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#endif
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#endif /*__KERNEL__ */
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#endif /* _ASM_POWERPC_TLBFLUSH_H */
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