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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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c5102f5935
The cacheflush syscall can fail for two reasons: (1) The arguments are invalid (nonsensical address range or no VMA) (2) The region generates a translation fault on a VIPT or PIPT cache This patch allows do_cache_op to return an error code to userspace in the case of the above. The various coherent_user_range implementations are modified to return 0 in the case of VIVT caches or -EFAULT in the case of an abort on v6/v7 cores. Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
599 lines
15 KiB
ArmAsm
599 lines
15 KiB
ArmAsm
/*
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* linux/arch/arm/mm/proc-feroceon.S: MMU functions for Feroceon
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*
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* Heavily based on proc-arm926.S
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* Maintainer: Assaf Hoffman <hoffman@marvell.com>
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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 as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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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/hwcap.h>
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#include <asm/pgtable-hwdef.h>
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#include <asm/pgtable.h>
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#include <asm/page.h>
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#include <asm/ptrace.h>
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#include "proc-macros.S"
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/*
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* This is the maximum size of an area which will be invalidated
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* using the single invalidate entry instructions. Anything larger
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* than this, and we go for the whole cache.
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*
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* This value should be chosen such that we choose the cheapest
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* alternative.
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*/
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#define CACHE_DLIMIT 16384
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/*
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* the cache line size of the I and D cache
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*/
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#define CACHE_DLINESIZE 32
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.bss
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.align 3
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__cache_params_loc:
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.space 8
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.text
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__cache_params:
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.word __cache_params_loc
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/*
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* cpu_feroceon_proc_init()
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*/
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ENTRY(cpu_feroceon_proc_init)
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mrc p15, 0, r0, c0, c0, 1 @ read cache type register
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ldr r1, __cache_params
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mov r2, #(16 << 5)
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tst r0, #(1 << 16) @ get way
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mov r0, r0, lsr #18 @ get cache size order
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movne r3, #((4 - 1) << 30) @ 4-way
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and r0, r0, #0xf
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moveq r3, #0 @ 1-way
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mov r2, r2, lsl r0 @ actual cache size
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movne r2, r2, lsr #2 @ turned into # of sets
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sub r2, r2, #(1 << 5)
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stmia r1, {r2, r3}
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mov pc, lr
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/*
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* cpu_feroceon_proc_fin()
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*/
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ENTRY(cpu_feroceon_proc_fin)
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#if defined(CONFIG_CACHE_FEROCEON_L2) && \
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!defined(CONFIG_CACHE_FEROCEON_L2_WRITETHROUGH)
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mov r0, #0
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mcr p15, 1, r0, c15, c9, 0 @ clean L2
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mcr p15, 0, r0, c7, c10, 4 @ drain WB
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#endif
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mrc p15, 0, r0, c1, c0, 0 @ ctrl register
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bic r0, r0, #0x1000 @ ...i............
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bic r0, r0, #0x000e @ ............wca.
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mcr p15, 0, r0, c1, c0, 0 @ disable caches
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mov pc, lr
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/*
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* cpu_feroceon_reset(loc)
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*
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* Perform a soft reset of the system. Put the CPU into the
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* same state as it would be if it had been reset, and branch
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* to what would be the reset vector.
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*
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* loc: location to jump to for soft reset
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*/
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.align 5
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.pushsection .idmap.text, "ax"
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ENTRY(cpu_feroceon_reset)
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mov ip, #0
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mcr p15, 0, ip, c7, c7, 0 @ invalidate I,D caches
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mcr p15, 0, ip, c7, c10, 4 @ drain WB
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#ifdef CONFIG_MMU
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mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs
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#endif
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mrc p15, 0, ip, c1, c0, 0 @ ctrl register
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bic ip, ip, #0x000f @ ............wcam
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bic ip, ip, #0x1100 @ ...i...s........
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mcr p15, 0, ip, c1, c0, 0 @ ctrl register
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mov pc, r0
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ENDPROC(cpu_feroceon_reset)
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.popsection
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/*
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* cpu_feroceon_do_idle()
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*
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* Called with IRQs disabled
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*/
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.align 5
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ENTRY(cpu_feroceon_do_idle)
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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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mcr p15, 0, r0, c7, c0, 4 @ Wait for interrupt
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mov pc, lr
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/*
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* flush_icache_all()
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*
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* Unconditionally clean and invalidate the entire icache.
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*/
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ENTRY(feroceon_flush_icache_all)
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mov r0, #0
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mcr p15, 0, r0, c7, c5, 0 @ invalidate I cache
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mov pc, lr
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ENDPROC(feroceon_flush_icache_all)
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/*
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* flush_user_cache_all()
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*
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* Clean and invalidate all cache entries in a particular
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* address space.
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*/
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.align 5
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ENTRY(feroceon_flush_user_cache_all)
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/* FALLTHROUGH */
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/*
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* flush_kern_cache_all()
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*
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* Clean and invalidate the entire cache.
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*/
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ENTRY(feroceon_flush_kern_cache_all)
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mov r2, #VM_EXEC
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__flush_whole_cache:
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ldr r1, __cache_params
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ldmia r1, {r1, r3}
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1: orr ip, r1, r3
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2: mcr p15, 0, ip, c7, c14, 2 @ clean + invalidate D set/way
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subs ip, ip, #(1 << 30) @ next way
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bcs 2b
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subs r1, r1, #(1 << 5) @ next set
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bcs 1b
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tst r2, #VM_EXEC
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mov ip, #0
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mcrne p15, 0, ip, c7, c5, 0 @ invalidate I cache
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mcrne p15, 0, ip, c7, c10, 4 @ drain WB
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mov pc, lr
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/*
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* flush_user_cache_range(start, end, flags)
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*
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* Clean and invalidate a range of cache entries in the
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* specified address range.
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*
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* - start - start address (inclusive)
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* - end - end address (exclusive)
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* - flags - vm_flags describing address space
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*/
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.align 5
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ENTRY(feroceon_flush_user_cache_range)
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sub r3, r1, r0 @ calculate total size
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cmp r3, #CACHE_DLIMIT
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bgt __flush_whole_cache
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1: tst r2, #VM_EXEC
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mcr p15, 0, r0, c7, c14, 1 @ clean and invalidate D entry
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mcrne p15, 0, r0, c7, c5, 1 @ invalidate I entry
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add r0, r0, #CACHE_DLINESIZE
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mcr p15, 0, r0, c7, c14, 1 @ clean and invalidate D entry
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mcrne p15, 0, r0, c7, c5, 1 @ invalidate I entry
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add r0, r0, #CACHE_DLINESIZE
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cmp r0, r1
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blo 1b
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tst r2, #VM_EXEC
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mov ip, #0
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mcrne p15, 0, ip, c7, c10, 4 @ drain WB
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mov pc, lr
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/*
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* coherent_kern_range(start, end)
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*
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* Ensure coherency between the Icache and the Dcache in the
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* region described by start, end. If you have non-snooping
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* Harvard caches, you need to implement this function.
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*
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* - start - virtual start address
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* - end - virtual end address
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*/
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.align 5
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ENTRY(feroceon_coherent_kern_range)
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/* FALLTHROUGH */
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/*
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* coherent_user_range(start, end)
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*
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* Ensure coherency between the Icache and the Dcache in the
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* region described by start, end. If you have non-snooping
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* Harvard caches, you need to implement this function.
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*
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* - start - virtual start address
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* - end - virtual end address
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*/
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ENTRY(feroceon_coherent_user_range)
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bic r0, r0, #CACHE_DLINESIZE - 1
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1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
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mcr p15, 0, r0, c7, c5, 1 @ invalidate I entry
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add r0, r0, #CACHE_DLINESIZE
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cmp r0, r1
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blo 1b
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mcr p15, 0, r0, c7, c10, 4 @ drain WB
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mov r0, #0
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mov pc, lr
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/*
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* flush_kern_dcache_area(void *addr, size_t size)
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*
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* Ensure no D cache aliasing occurs, either with itself or
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* the I cache
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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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.align 5
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ENTRY(feroceon_flush_kern_dcache_area)
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add r1, r0, r1
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1: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
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add r0, r0, #CACHE_DLINESIZE
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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, c5, 0 @ invalidate I cache
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mcr p15, 0, r0, c7, c10, 4 @ drain WB
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mov pc, lr
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.align 5
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ENTRY(feroceon_range_flush_kern_dcache_area)
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mrs r2, cpsr
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add r1, r0, #PAGE_SZ - CACHE_DLINESIZE @ top addr is inclusive
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orr r3, r2, #PSR_I_BIT
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msr cpsr_c, r3 @ disable interrupts
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mcr p15, 5, r0, c15, c15, 0 @ D clean/inv range start
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mcr p15, 5, r1, c15, c15, 1 @ D clean/inv range top
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msr cpsr_c, r2 @ restore interrupts
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mov r0, #0
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mcr p15, 0, r0, c7, c5, 0 @ invalidate I cache
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mcr p15, 0, r0, c7, c10, 4 @ drain WB
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mov pc, lr
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/*
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* dma_inv_range(start, end)
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*
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* Invalidate (discard) the specified virtual address range.
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* May not write back any entries. If 'start' or 'end'
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* are not cache line aligned, those lines must be written
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* back.
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*
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* - start - virtual start address
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* - end - virtual end address
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*
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* (same as v4wb)
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*/
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.align 5
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feroceon_dma_inv_range:
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tst r0, #CACHE_DLINESIZE - 1
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bic r0, r0, #CACHE_DLINESIZE - 1
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mcrne p15, 0, r0, c7, c10, 1 @ clean D entry
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tst r1, #CACHE_DLINESIZE - 1
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mcrne p15, 0, r1, c7, c10, 1 @ clean D entry
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1: mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry
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add r0, r0, #CACHE_DLINESIZE
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cmp r0, r1
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blo 1b
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mcr p15, 0, r0, c7, c10, 4 @ drain WB
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mov pc, lr
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.align 5
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feroceon_range_dma_inv_range:
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mrs r2, cpsr
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tst r0, #CACHE_DLINESIZE - 1
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mcrne p15, 0, r0, c7, c10, 1 @ clean D entry
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tst r1, #CACHE_DLINESIZE - 1
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mcrne p15, 0, r1, c7, c10, 1 @ clean D entry
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cmp r1, r0
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subne r1, r1, #1 @ top address is inclusive
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orr r3, r2, #PSR_I_BIT
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msr cpsr_c, r3 @ disable interrupts
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mcr p15, 5, r0, c15, c14, 0 @ D inv range start
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mcr p15, 5, r1, c15, c14, 1 @ D inv range top
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msr cpsr_c, r2 @ restore interrupts
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mov pc, lr
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/*
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* dma_clean_range(start, end)
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*
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* Clean the specified virtual address range.
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*
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* - start - virtual start address
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* - end - virtual end address
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*
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* (same as v4wb)
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*/
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.align 5
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feroceon_dma_clean_range:
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bic r0, r0, #CACHE_DLINESIZE - 1
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1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
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add r0, r0, #CACHE_DLINESIZE
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cmp r0, r1
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blo 1b
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mcr p15, 0, r0, c7, c10, 4 @ drain WB
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mov pc, lr
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.align 5
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feroceon_range_dma_clean_range:
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mrs r2, cpsr
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cmp r1, r0
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subne r1, r1, #1 @ top address is inclusive
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orr r3, r2, #PSR_I_BIT
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msr cpsr_c, r3 @ disable interrupts
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mcr p15, 5, r0, c15, c13, 0 @ D clean range start
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mcr p15, 5, r1, c15, c13, 1 @ D clean range top
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msr cpsr_c, r2 @ restore interrupts
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mcr p15, 0, r0, c7, c10, 4 @ drain WB
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mov pc, lr
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/*
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* dma_flush_range(start, end)
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*
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* Clean and invalidate the specified virtual address range.
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*
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* - start - virtual start address
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* - end - virtual end address
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*/
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.align 5
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ENTRY(feroceon_dma_flush_range)
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bic r0, r0, #CACHE_DLINESIZE - 1
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1: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
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add r0, r0, #CACHE_DLINESIZE
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cmp r0, r1
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blo 1b
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mcr p15, 0, r0, c7, c10, 4 @ drain WB
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mov pc, lr
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.align 5
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ENTRY(feroceon_range_dma_flush_range)
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mrs r2, cpsr
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cmp r1, r0
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subne r1, r1, #1 @ top address is inclusive
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orr r3, r2, #PSR_I_BIT
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msr cpsr_c, r3 @ disable interrupts
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mcr p15, 5, r0, c15, c15, 0 @ D clean/inv range start
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mcr p15, 5, r1, c15, c15, 1 @ D clean/inv range top
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msr cpsr_c, r2 @ restore interrupts
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mcr p15, 0, r0, c7, c10, 4 @ drain WB
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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(feroceon_dma_map_area)
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add r1, r1, r0
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cmp r2, #DMA_TO_DEVICE
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beq feroceon_dma_clean_range
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bcs feroceon_dma_inv_range
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b feroceon_dma_flush_range
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ENDPROC(feroceon_dma_map_area)
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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(feroceon_range_dma_map_area)
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add r1, r1, r0
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cmp r2, #DMA_TO_DEVICE
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beq feroceon_range_dma_clean_range
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bcs feroceon_range_dma_inv_range
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b feroceon_range_dma_flush_range
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ENDPROC(feroceon_range_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(feroceon_dma_unmap_area)
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mov pc, lr
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ENDPROC(feroceon_dma_unmap_area)
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@ define struct cpu_cache_fns (see <asm/cacheflush.h> and proc-macros.S)
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define_cache_functions feroceon
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.macro range_alias basename
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.globl feroceon_range_\basename
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.type feroceon_range_\basename , %function
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.equ feroceon_range_\basename , feroceon_\basename
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.endm
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/*
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* Most of the cache functions are unchanged for this case.
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* Export suitable alias symbols for the unchanged functions:
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*/
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range_alias flush_icache_all
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range_alias flush_user_cache_all
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range_alias flush_kern_cache_all
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range_alias flush_user_cache_range
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range_alias coherent_kern_range
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range_alias coherent_user_range
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range_alias dma_unmap_area
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define_cache_functions feroceon_range
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.align 5
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ENTRY(cpu_feroceon_dcache_clean_area)
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#if defined(CONFIG_CACHE_FEROCEON_L2) && \
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!defined(CONFIG_CACHE_FEROCEON_L2_WRITETHROUGH)
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mov r2, r0
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mov r3, r1
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#endif
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1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
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add r0, r0, #CACHE_DLINESIZE
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subs r1, r1, #CACHE_DLINESIZE
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bhi 1b
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#if defined(CONFIG_CACHE_FEROCEON_L2) && \
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!defined(CONFIG_CACHE_FEROCEON_L2_WRITETHROUGH)
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1: mcr p15, 1, r2, c15, c9, 1 @ clean L2 entry
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add r2, r2, #CACHE_DLINESIZE
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subs r3, r3, #CACHE_DLINESIZE
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bhi 1b
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#endif
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mcr p15, 0, r0, c7, c10, 4 @ drain WB
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mov pc, lr
|
|
|
|
/* =============================== PageTable ============================== */
|
|
|
|
/*
|
|
* cpu_feroceon_switch_mm(pgd)
|
|
*
|
|
* Set the translation base pointer to be as described by pgd.
|
|
*
|
|
* pgd: new page tables
|
|
*/
|
|
.align 5
|
|
ENTRY(cpu_feroceon_switch_mm)
|
|
#ifdef CONFIG_MMU
|
|
/*
|
|
* Note: we wish to call __flush_whole_cache but we need to preserve
|
|
* lr to do so. The only way without touching main memory is to
|
|
* use r2 which is normally used to test the VM_EXEC flag, and
|
|
* compensate locally for the skipped ops if it is not set.
|
|
*/
|
|
mov r2, lr @ abuse r2 to preserve lr
|
|
bl __flush_whole_cache
|
|
@ if r2 contains the VM_EXEC bit then the next 2 ops are done already
|
|
tst r2, #VM_EXEC
|
|
mcreq p15, 0, ip, c7, c5, 0 @ invalidate I cache
|
|
mcreq p15, 0, ip, c7, c10, 4 @ drain WB
|
|
|
|
mcr p15, 0, r0, c2, c0, 0 @ load page table pointer
|
|
mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs
|
|
mov pc, r2
|
|
#else
|
|
mov pc, lr
|
|
#endif
|
|
|
|
/*
|
|
* cpu_feroceon_set_pte_ext(ptep, pte, ext)
|
|
*
|
|
* Set a PTE and flush it out
|
|
*/
|
|
.align 5
|
|
ENTRY(cpu_feroceon_set_pte_ext)
|
|
#ifdef CONFIG_MMU
|
|
armv3_set_pte_ext wc_disable=0
|
|
mov r0, r0
|
|
mcr p15, 0, r0, c7, c10, 1 @ clean D entry
|
|
#if defined(CONFIG_CACHE_FEROCEON_L2) && \
|
|
!defined(CONFIG_CACHE_FEROCEON_L2_WRITETHROUGH)
|
|
mcr p15, 1, r0, c15, c9, 1 @ clean L2 entry
|
|
#endif
|
|
mcr p15, 0, r0, c7, c10, 4 @ drain WB
|
|
#endif
|
|
mov pc, lr
|
|
|
|
__CPUINIT
|
|
|
|
.type __feroceon_setup, #function
|
|
__feroceon_setup:
|
|
mov r0, #0
|
|
mcr p15, 0, r0, c7, c7 @ invalidate I,D caches on v4
|
|
mcr p15, 0, r0, c7, c10, 4 @ drain write buffer on v4
|
|
#ifdef CONFIG_MMU
|
|
mcr p15, 0, r0, c8, c7 @ invalidate I,D TLBs on v4
|
|
#endif
|
|
|
|
adr r5, feroceon_crval
|
|
ldmia r5, {r5, r6}
|
|
mrc p15, 0, r0, c1, c0 @ get control register v4
|
|
bic r0, r0, r5
|
|
orr r0, r0, r6
|
|
mov pc, lr
|
|
.size __feroceon_setup, . - __feroceon_setup
|
|
|
|
/*
|
|
* B
|
|
* R P
|
|
* .RVI UFRS BLDP WCAM
|
|
* .011 .001 ..11 0101
|
|
*
|
|
*/
|
|
.type feroceon_crval, #object
|
|
feroceon_crval:
|
|
crval clear=0x0000773f, mmuset=0x00003135, ucset=0x00001134
|
|
|
|
__INITDATA
|
|
|
|
@ define struct processor (see <asm/proc-fns.h> and proc-macros.S)
|
|
define_processor_functions feroceon, dabort=v5t_early_abort, pabort=legacy_pabort
|
|
|
|
.section ".rodata"
|
|
|
|
string cpu_arch_name, "armv5te"
|
|
string cpu_elf_name, "v5"
|
|
string cpu_feroceon_name, "Feroceon"
|
|
string cpu_88fr531_name, "Feroceon 88FR531-vd"
|
|
string cpu_88fr571_name, "Feroceon 88FR571-vd"
|
|
string cpu_88fr131_name, "Feroceon 88FR131"
|
|
|
|
.align
|
|
|
|
.section ".proc.info.init", #alloc, #execinstr
|
|
|
|
.macro feroceon_proc_info name:req, cpu_val:req, cpu_mask:req, cpu_name:req, cache:req
|
|
.type __\name\()_proc_info,#object
|
|
__\name\()_proc_info:
|
|
.long \cpu_val
|
|
.long \cpu_mask
|
|
.long PMD_TYPE_SECT | \
|
|
PMD_SECT_BUFFERABLE | \
|
|
PMD_SECT_CACHEABLE | \
|
|
PMD_BIT4 | \
|
|
PMD_SECT_AP_WRITE | \
|
|
PMD_SECT_AP_READ
|
|
.long PMD_TYPE_SECT | \
|
|
PMD_BIT4 | \
|
|
PMD_SECT_AP_WRITE | \
|
|
PMD_SECT_AP_READ
|
|
b __feroceon_setup
|
|
.long cpu_arch_name
|
|
.long cpu_elf_name
|
|
.long HWCAP_SWP|HWCAP_HALF|HWCAP_THUMB|HWCAP_FAST_MULT|HWCAP_EDSP
|
|
.long \cpu_name
|
|
.long feroceon_processor_functions
|
|
.long v4wbi_tlb_fns
|
|
.long feroceon_user_fns
|
|
.long \cache
|
|
.size __\name\()_proc_info, . - __\name\()_proc_info
|
|
.endm
|
|
|
|
#ifdef CONFIG_CPU_FEROCEON_OLD_ID
|
|
feroceon_proc_info feroceon_old_id, 0x41009260, 0xff00fff0, \
|
|
cpu_name=cpu_feroceon_name, cache=feroceon_cache_fns
|
|
#endif
|
|
|
|
feroceon_proc_info 88fr531, 0x56055310, 0xfffffff0, cpu_88fr531_name, \
|
|
cache=feroceon_cache_fns
|
|
feroceon_proc_info 88fr571, 0x56155710, 0xfffffff0, cpu_88fr571_name, \
|
|
cache=feroceon_range_cache_fns
|
|
feroceon_proc_info 88fr131, 0x56251310, 0xfffffff0, cpu_88fr131_name, \
|
|
cache=feroceon_range_cache_fns
|