From aefd9461d34a1b0a2acad0750c43216c1c27b9d4 Mon Sep 17 00:00:00 2001 From: Guo Ren Date: Sat, 28 Mar 2020 19:14:37 +0800 Subject: [PATCH] csky: Fixup cpu speculative execution to IO area For the memory size ( > 512MB, < 1GB), the MSA setting is: - SSEG0: PHY_START , PHY_START + 512MB - SSEG1: PHY_START + 512MB, PHY_START + 1GB But the real memory is no more than 1GB, there is a gap between the end size of memory and border of 1GB. CPU could speculatively execute to that gap and if the gap of the bus couldn't respond to the CPU request, then the crash will happen. Now make the setting with: - SSEG0: PHY_START , PHY_START + 512MB (no change) - SSEG1: Disabled (We use highmem to use the memory of 512MB~1GB) We also deprecated zhole_szie[] settings, it's only used by arm style CPUs. All memory gap should use Reserved setting of dts in csky system. Signed-off-by: Guo Ren --- arch/csky/abiv1/inc/abi/entry.h | 5 +-- arch/csky/abiv2/inc/abi/entry.h | 7 ++-- arch/csky/kernel/head.S | 5 +++ arch/csky/kernel/setup.c | 63 ++++++++------------------------- arch/csky/kernel/smp.c | 3 ++ 5 files changed, 25 insertions(+), 58 deletions(-) diff --git a/arch/csky/abiv1/inc/abi/entry.h b/arch/csky/abiv1/inc/abi/entry.h index f35a9f3315ee..5056ebb902d1 100644 --- a/arch/csky/abiv1/inc/abi/entry.h +++ b/arch/csky/abiv1/inc/abi/entry.h @@ -172,10 +172,7 @@ addi r6, 0xe cpwcr r6, cpcr30 - lsri r6, 28 - addi r6, 2 - lsli r6, 28 - addi r6, 0xe + movi r6, 0 cpwcr r6, cpcr31 .endm diff --git a/arch/csky/abiv2/inc/abi/entry.h b/arch/csky/abiv2/inc/abi/entry.h index 6a404393d0f4..a99aff555a0a 100644 --- a/arch/csky/abiv2/inc/abi/entry.h +++ b/arch/csky/abiv2/inc/abi/entry.h @@ -290,11 +290,8 @@ addi r6, 0x1ce mtcr r6, cr<30, 15> /* Set MSA0 */ - lsri r6, 28 - addi r6, 2 - lsli r6, 28 - addi r6, 0x1ce - mtcr r6, cr<31, 15> /* Set MSA1 */ + movi r6, 0 + mtcr r6, cr<31, 15> /* Clr MSA1 */ /* enable MMU */ mfcr r6, cr18 diff --git a/arch/csky/kernel/head.S b/arch/csky/kernel/head.S index 61989f9241c0..17ed9d250480 100644 --- a/arch/csky/kernel/head.S +++ b/arch/csky/kernel/head.S @@ -21,6 +21,11 @@ END(_start) ENTRY(_start_smp_secondary) SETUP_MMU + /* copy msa1 from CPU0 */ + lrw r6, secondary_msa1 + ld.w r6, (r6, 0) + mtcr r6, cr<31, 15> + /* set stack point */ lrw r6, secondary_stack ld.w r6, (r6, 0) diff --git a/arch/csky/kernel/setup.c b/arch/csky/kernel/setup.c index 3821e55742f4..819a9a7bf786 100644 --- a/arch/csky/kernel/setup.c +++ b/arch/csky/kernel/setup.c @@ -24,26 +24,9 @@ struct screen_info screen_info = { }; #endif -phys_addr_t __init_memblock memblock_end_of_REG0(void) -{ - return (memblock.memory.regions[0].base + - memblock.memory.regions[0].size); -} - -phys_addr_t __init_memblock memblock_start_of_REG1(void) -{ - return memblock.memory.regions[1].base; -} - -size_t __init_memblock memblock_size_of_REG1(void) -{ - return memblock.memory.regions[1].size; -} - static void __init csky_memblock_init(void) { unsigned long zone_size[MAX_NR_ZONES]; - unsigned long zhole_size[MAX_NR_ZONES]; signed long size; memblock_reserve(__pa(_stext), _end - _stext); @@ -54,54 +37,36 @@ static void __init csky_memblock_init(void) memblock_dump_all(); memset(zone_size, 0, sizeof(zone_size)); - memset(zhole_size, 0, sizeof(zhole_size)); min_low_pfn = PFN_UP(memblock_start_of_DRAM()); - max_pfn = PFN_DOWN(memblock_end_of_DRAM()); - - max_low_pfn = PFN_UP(memblock_end_of_REG0()); - if (max_low_pfn == 0) - max_low_pfn = max_pfn; + max_low_pfn = max_pfn = PFN_DOWN(memblock_end_of_DRAM()); size = max_pfn - min_low_pfn; - if (memblock.memory.cnt > 1) { - zone_size[ZONE_NORMAL] = - PFN_DOWN(memblock_start_of_REG1()) - min_low_pfn; - zhole_size[ZONE_NORMAL] = - PFN_DOWN(memblock_start_of_REG1()) - max_low_pfn; + if (size <= PFN_DOWN(SSEG_SIZE - PHYS_OFFSET_OFFSET)) + zone_size[ZONE_NORMAL] = size; + else if (size < PFN_DOWN(LOWMEM_LIMIT - PHYS_OFFSET_OFFSET)) { + zone_size[ZONE_NORMAL] = + PFN_DOWN(SSEG_SIZE - PHYS_OFFSET_OFFSET); + max_low_pfn = min_low_pfn + zone_size[ZONE_NORMAL]; } else { - if (size <= PFN_DOWN(LOWMEM_LIMIT - PHYS_OFFSET_OFFSET)) - zone_size[ZONE_NORMAL] = max_pfn - min_low_pfn; - else { - zone_size[ZONE_NORMAL] = + zone_size[ZONE_NORMAL] = PFN_DOWN(LOWMEM_LIMIT - PHYS_OFFSET_OFFSET); - max_low_pfn = min_low_pfn + zone_size[ZONE_NORMAL]; - } + max_low_pfn = min_low_pfn + zone_size[ZONE_NORMAL]; + write_mmu_msa1(read_mmu_msa0() + SSEG_SIZE); } #ifdef CONFIG_HIGHMEM - size = 0; - if (memblock.memory.cnt > 1) { - size = PFN_DOWN(memblock_size_of_REG1()); - highstart_pfn = PFN_DOWN(memblock_start_of_REG1()); - } else { - size = max_pfn - min_low_pfn - - PFN_DOWN(LOWMEM_LIMIT - PHYS_OFFSET_OFFSET); - highstart_pfn = min_low_pfn + - PFN_DOWN(LOWMEM_LIMIT - PHYS_OFFSET_OFFSET); - } + zone_size[ZONE_HIGHMEM] = max_pfn - max_low_pfn; - if (size > 0) - zone_size[ZONE_HIGHMEM] = size; - - highend_pfn = max_pfn; + highstart_pfn = max_low_pfn; + highend_pfn = max_pfn; #endif memblock_set_current_limit(PFN_PHYS(max_low_pfn)); dma_contiguous_reserve(0); - free_area_init_node(0, zone_size, min_low_pfn, zhole_size); + free_area_init_node(0, zone_size, min_low_pfn, NULL); } void __init setup_arch(char **cmdline_p) diff --git a/arch/csky/kernel/smp.c b/arch/csky/kernel/smp.c index df2e2174dbd0..b5c5bc3afeb5 100644 --- a/arch/csky/kernel/smp.c +++ b/arch/csky/kernel/smp.c @@ -159,6 +159,8 @@ volatile unsigned int secondary_hint; volatile unsigned int secondary_ccr; volatile unsigned int secondary_stack; +unsigned long secondary_msa1; + int __cpu_up(unsigned int cpu, struct task_struct *tidle) { unsigned long mask = 1 << cpu; @@ -167,6 +169,7 @@ int __cpu_up(unsigned int cpu, struct task_struct *tidle) (unsigned int) task_stack_page(tidle) + THREAD_SIZE - 8; secondary_hint = mfcr("cr31"); secondary_ccr = mfcr("cr18"); + secondary_msa1 = read_mmu_msa1(); /* * Because other CPUs are in reset status, we must flush data