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031bd879f7
ARM v7 architecture introduced the concept of cache levels and related control registers. New processors like A7 and A15 embed an L2 unified cache controller that becomes part of the cache level hierarchy. Some operations in the kernel like cpu_suspend and __cpu_disable do not require a flush of the entire cache hierarchy to DRAM but just the cache levels belonging to the Level of Unification Inner Shareable (LoUIS), which in most of ARM v7 systems correspond to L1. The current cache flushing API used in cpu_suspend and __cpu_disable, flush_cache_all(), ends up flushing the whole cache hierarchy since for v7 it cleans and invalidates all cache levels up to Level of Coherency (LoC) which cripples system performance when used in hot paths like hotplug and cpuidle. Therefore a new kernel cache maintenance API must be added to cope with latest ARM system requirements. This patch adds flush_cache_louis() to the ARM kernel cache maintenance API. This function cleans and invalidates all data cache levels up to the Level of Unification Inner Shareable (LoUIS) and invalidates the instruction cache for processors that support it (> v7). This patch also creates an alias of the cache LoUIS function to flush_kern_all for all processor versions prior to v7, so that the current cache flushing behaviour is unchanged for those processors. v7 cache maintenance code implements a cache LoUIS function that cleans and invalidates the D-cache up to LoUIS and invalidates the I-cache, according to the new API. Reviewed-by: Santosh Shilimkar <santosh.shilimkar@ti.com> Reviewed-by: Nicolas Pitre <nico@linaro.org> Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Tested-by: Shawn Guo <shawn.guo@linaro.org>
336 lines
7.9 KiB
ArmAsm
336 lines
7.9 KiB
ArmAsm
/*
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* linux/arch/arm/mm/cache-v6.S
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*
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* Copyright (C) 2001 Deep Blue Solutions Ltd.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This is the "shell" of the ARMv6 processor support.
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*/
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#include <linux/linkage.h>
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#include <linux/init.h>
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#include <asm/assembler.h>
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#include <asm/errno.h>
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#include <asm/unwind.h>
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#include "proc-macros.S"
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#define HARVARD_CACHE
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#define CACHE_LINE_SIZE 32
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#define D_CACHE_LINE_SIZE 32
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#define BTB_FLUSH_SIZE 8
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/*
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* v6_flush_icache_all()
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*
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* Flush the whole I-cache.
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*
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* ARM1136 erratum 411920 - Invalidate Instruction Cache operation can fail.
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* This erratum is present in 1136, 1156 and 1176. It does not affect the
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* MPCore.
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*
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* Registers:
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* r0 - set to 0
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* r1 - corrupted
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*/
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ENTRY(v6_flush_icache_all)
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mov r0, #0
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#ifdef CONFIG_ARM_ERRATA_411920
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mrs r1, cpsr
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cpsid ifa @ disable interrupts
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mcr p15, 0, r0, c7, c5, 0 @ invalidate entire I-cache
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mcr p15, 0, r0, c7, c5, 0 @ invalidate entire I-cache
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mcr p15, 0, r0, c7, c5, 0 @ invalidate entire I-cache
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mcr p15, 0, r0, c7, c5, 0 @ invalidate entire I-cache
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msr cpsr_cx, r1 @ restore interrupts
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.rept 11 @ ARM Ltd recommends at least
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nop @ 11 NOPs
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.endr
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#else
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mcr p15, 0, r0, c7, c5, 0 @ invalidate I-cache
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#endif
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mov pc, lr
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ENDPROC(v6_flush_icache_all)
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/*
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* v6_flush_cache_all()
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*
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* Flush the entire cache.
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*
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* It is assumed that:
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*/
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ENTRY(v6_flush_kern_cache_all)
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mov r0, #0
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#ifdef HARVARD_CACHE
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mcr p15, 0, r0, c7, c14, 0 @ D cache clean+invalidate
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#ifndef CONFIG_ARM_ERRATA_411920
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mcr p15, 0, r0, c7, c5, 0 @ I+BTB cache invalidate
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#else
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b v6_flush_icache_all
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#endif
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#else
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mcr p15, 0, r0, c7, c15, 0 @ Cache clean+invalidate
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#endif
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mov pc, lr
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/*
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* v6_flush_cache_all()
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*
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* Flush all TLB entries in a particular address space
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*
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* - mm - mm_struct describing address space
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*/
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ENTRY(v6_flush_user_cache_all)
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/*FALLTHROUGH*/
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/*
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* v6_flush_cache_range(start, end, flags)
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*
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* Flush a range of TLB entries in the specified address space.
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*
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* - start - start address (may not be aligned)
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* - end - end address (exclusive, may not be aligned)
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* - flags - vm_area_struct flags describing address space
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*
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* It is assumed that:
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* - we have a VIPT cache.
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*/
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ENTRY(v6_flush_user_cache_range)
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mov pc, lr
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/*
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* v6_coherent_kern_range(start,end)
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*
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* Ensure that the I and D caches are coherent within specified
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* region. This is typically used when code has been written to
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* a memory region, and will be executed.
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*
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* - start - virtual start address of region
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* - end - virtual end address of region
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*
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* It is assumed that:
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* - the Icache does not read data from the write buffer
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*/
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ENTRY(v6_coherent_kern_range)
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/* FALLTHROUGH */
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/*
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* v6_coherent_user_range(start,end)
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*
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* Ensure that the I and D caches are coherent within specified
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* region. This is typically used when code has been written to
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* a memory region, and will be executed.
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*
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* - start - virtual start address of region
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* - end - virtual end address of region
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*
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* It is assumed that:
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* - the Icache does not read data from the write buffer
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*/
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ENTRY(v6_coherent_user_range)
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UNWIND(.fnstart )
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#ifdef HARVARD_CACHE
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bic r0, r0, #CACHE_LINE_SIZE - 1
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1:
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USER( mcr p15, 0, r0, c7, c10, 1 ) @ clean D line
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add r0, r0, #CACHE_LINE_SIZE
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cmp r0, r1
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blo 1b
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#endif
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mov r0, #0
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#ifdef HARVARD_CACHE
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mcr p15, 0, r0, c7, c10, 4 @ drain write buffer
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#ifndef CONFIG_ARM_ERRATA_411920
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mcr p15, 0, r0, c7, c5, 0 @ I+BTB cache invalidate
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#else
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b v6_flush_icache_all
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#endif
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#else
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mcr p15, 0, r0, c7, c5, 6 @ invalidate BTB
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#endif
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mov pc, lr
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/*
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* Fault handling for the cache operation above. If the virtual address in r0
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* isn't mapped, fail with -EFAULT.
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*/
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9001:
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mov r0, #-EFAULT
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mov pc, lr
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UNWIND(.fnend )
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ENDPROC(v6_coherent_user_range)
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ENDPROC(v6_coherent_kern_range)
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/*
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* v6_flush_kern_dcache_area(void *addr, size_t size)
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*
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* Ensure that the data held in the page kaddr is written back
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* to the page in question.
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*
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* - addr - kernel address
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* - size - region size
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*/
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ENTRY(v6_flush_kern_dcache_area)
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add r1, r0, r1
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bic r0, r0, #D_CACHE_LINE_SIZE - 1
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1:
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#ifdef HARVARD_CACHE
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mcr p15, 0, r0, c7, c14, 1 @ clean & invalidate D line
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#else
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mcr p15, 0, r0, c7, c15, 1 @ clean & invalidate unified line
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#endif
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add r0, r0, #D_CACHE_LINE_SIZE
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cmp r0, r1
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blo 1b
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#ifdef HARVARD_CACHE
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mov r0, #0
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mcr p15, 0, r0, c7, c10, 4
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#endif
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mov pc, lr
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/*
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* v6_dma_inv_range(start,end)
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*
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* Invalidate the data cache within the specified region; we will
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* be performing a DMA operation in this region and we want to
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* purge old data in the cache.
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*
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* - start - virtual start address of region
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* - end - virtual end address of region
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*/
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v6_dma_inv_range:
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#ifdef CONFIG_DMA_CACHE_RWFO
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ldrb r2, [r0] @ read for ownership
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strb r2, [r0] @ write for ownership
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#endif
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tst r0, #D_CACHE_LINE_SIZE - 1
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bic r0, r0, #D_CACHE_LINE_SIZE - 1
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#ifdef HARVARD_CACHE
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mcrne p15, 0, r0, c7, c10, 1 @ clean D line
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#else
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mcrne p15, 0, r0, c7, c11, 1 @ clean unified line
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#endif
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tst r1, #D_CACHE_LINE_SIZE - 1
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#ifdef CONFIG_DMA_CACHE_RWFO
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ldrneb r2, [r1, #-1] @ read for ownership
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strneb r2, [r1, #-1] @ write for ownership
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#endif
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bic r1, r1, #D_CACHE_LINE_SIZE - 1
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#ifdef HARVARD_CACHE
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mcrne p15, 0, r1, c7, c14, 1 @ clean & invalidate D line
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#else
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mcrne p15, 0, r1, c7, c15, 1 @ clean & invalidate unified line
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#endif
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1:
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#ifdef HARVARD_CACHE
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mcr p15, 0, r0, c7, c6, 1 @ invalidate D line
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#else
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mcr p15, 0, r0, c7, c7, 1 @ invalidate unified line
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#endif
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add r0, r0, #D_CACHE_LINE_SIZE
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cmp r0, r1
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#ifdef CONFIG_DMA_CACHE_RWFO
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ldrlo r2, [r0] @ read for ownership
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strlo r2, [r0] @ write for ownership
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#endif
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blo 1b
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mov r0, #0
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mcr p15, 0, r0, c7, c10, 4 @ drain write buffer
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mov pc, lr
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/*
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* v6_dma_clean_range(start,end)
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* - start - virtual start address of region
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* - end - virtual end address of region
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*/
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v6_dma_clean_range:
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bic r0, r0, #D_CACHE_LINE_SIZE - 1
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1:
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#ifdef CONFIG_DMA_CACHE_RWFO
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ldr r2, [r0] @ read for ownership
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#endif
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#ifdef HARVARD_CACHE
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mcr p15, 0, r0, c7, c10, 1 @ clean D line
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#else
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mcr p15, 0, r0, c7, c11, 1 @ clean unified line
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#endif
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add r0, r0, #D_CACHE_LINE_SIZE
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cmp r0, r1
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blo 1b
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mov r0, #0
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mcr p15, 0, r0, c7, c10, 4 @ drain write buffer
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mov pc, lr
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/*
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* v6_dma_flush_range(start,end)
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* - start - virtual start address of region
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* - end - virtual end address of region
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*/
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ENTRY(v6_dma_flush_range)
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#ifdef CONFIG_DMA_CACHE_RWFO
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ldrb r2, [r0] @ read for ownership
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strb r2, [r0] @ write for ownership
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#endif
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bic r0, r0, #D_CACHE_LINE_SIZE - 1
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1:
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#ifdef HARVARD_CACHE
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mcr p15, 0, r0, c7, c14, 1 @ clean & invalidate D line
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#else
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mcr p15, 0, r0, c7, c15, 1 @ clean & invalidate line
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#endif
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add r0, r0, #D_CACHE_LINE_SIZE
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cmp r0, r1
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#ifdef CONFIG_DMA_CACHE_RWFO
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ldrlob r2, [r0] @ read for ownership
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strlob r2, [r0] @ write for ownership
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#endif
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blo 1b
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mov r0, #0
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mcr p15, 0, r0, c7, c10, 4 @ drain write buffer
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mov pc, lr
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/*
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* dma_map_area(start, size, dir)
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* - start - kernel virtual start address
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* - size - size of region
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* - dir - DMA direction
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*/
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ENTRY(v6_dma_map_area)
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add r1, r1, r0
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teq r2, #DMA_FROM_DEVICE
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beq v6_dma_inv_range
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#ifndef CONFIG_DMA_CACHE_RWFO
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b v6_dma_clean_range
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#else
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teq r2, #DMA_TO_DEVICE
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beq v6_dma_clean_range
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b v6_dma_flush_range
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#endif
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ENDPROC(v6_dma_map_area)
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/*
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* dma_unmap_area(start, size, dir)
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* - start - kernel virtual start address
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* - size - size of region
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* - dir - DMA direction
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*/
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ENTRY(v6_dma_unmap_area)
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#ifndef CONFIG_DMA_CACHE_RWFO
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add r1, r1, r0
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teq r2, #DMA_TO_DEVICE
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bne v6_dma_inv_range
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#endif
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mov pc, lr
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ENDPROC(v6_dma_unmap_area)
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.globl v6_flush_kern_cache_louis
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.equ v6_flush_kern_cache_louis, v6_flush_kern_cache_all
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__INITDATA
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@ define struct cpu_cache_fns (see <asm/cacheflush.h> and proc-macros.S)
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define_cache_functions v6
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