From 48c4ac976ae995f263cde8f09578de86bc8e9f1d Mon Sep 17 00:00:00 2001 From: David Daney Date: Mon, 13 May 2013 13:56:44 -0700 Subject: Revert "MIPS: Allow ASID size to be determined at boot time." This reverts commit d532f3d26716a39dfd4b88d687bd344fbe77e390. The original commit has several problems: 1) Doesn't work with 64-bit kernels. 2) Calls TLBMISS_HANDLER_SETUP() before the code is generated. 3) Calls TLBMISS_HANDLER_SETUP() twice in per_cpu_trap_init() when only one call is needed. [ralf@linux-mips.org: Also revert the bits of the ASID patch which were hidden in the KVM merge.] Signed-off-by: David Daney Cc: linux-mips@linux-mips.org Cc: linux-kernel@vger.kernel.org Cc: "Steven J. Hill" Cc: David Daney Patchwork: https://patchwork.linux-mips.org/patch/5242/ Signed-off-by: Ralf Baechle --- arch/mips/include/asm/mmu_context.h | 95 ++++++++++++++----------------------- 1 file changed, 36 insertions(+), 59 deletions(-) (limited to 'arch/mips/include/asm/mmu_context.h') diff --git a/arch/mips/include/asm/mmu_context.h b/arch/mips/include/asm/mmu_context.h index 1554721e4808..820116067c10 100644 --- a/arch/mips/include/asm/mmu_context.h +++ b/arch/mips/include/asm/mmu_context.h @@ -67,68 +67,45 @@ extern unsigned long pgd_current[]; TLBMISS_HANDLER_SETUP_PGD(swapper_pg_dir) #endif #endif /* CONFIG_MIPS_PGD_C0_CONTEXT*/ +#if defined(CONFIG_CPU_R3000) || defined(CONFIG_CPU_TX39XX) -#define ASID_INC(asid) \ -({ \ - unsigned long __asid = asid; \ - __asm__("1:\taddiu\t%0,1\t\t\t\t# patched\n\t" \ - ".section\t__asid_inc,\"a\"\n\t" \ - ".word\t1b\n\t" \ - ".previous" \ - :"=r" (__asid) \ - :"0" (__asid)); \ - __asid; \ -}) -#define ASID_MASK(asid) \ -({ \ - unsigned long __asid = asid; \ - __asm__("1:\tandi\t%0,%1,0xfc0\t\t\t# patched\n\t" \ - ".section\t__asid_mask,\"a\"\n\t" \ - ".word\t1b\n\t" \ - ".previous" \ - :"=r" (__asid) \ - :"r" (__asid)); \ - __asid; \ -}) -#define ASID_VERSION_MASK \ -({ \ - unsigned long __asid; \ - __asm__("1:\taddiu\t%0,$0,0xff00\t\t\t\t# patched\n\t" \ - ".section\t__asid_version_mask,\"a\"\n\t" \ - ".word\t1b\n\t" \ - ".previous" \ - :"=r" (__asid)); \ - __asid; \ -}) -#define ASID_FIRST_VERSION \ -({ \ - unsigned long __asid = asid; \ - __asm__("1:\tli\t%0,0x100\t\t\t\t# patched\n\t" \ - ".section\t__asid_first_version,\"a\"\n\t" \ - ".word\t1b\n\t" \ - ".previous" \ - :"=r" (__asid)); \ - __asid; \ -}) - -#define ASID_FIRST_VERSION_R3000 0x1000 -#define ASID_FIRST_VERSION_R4000 0x100 -#define ASID_FIRST_VERSION_R8000 0x1000 -#define ASID_FIRST_VERSION_RM9000 0x1000 +#define ASID_INC 0x40 +#define ASID_MASK 0xfc0 + +#elif defined(CONFIG_CPU_R8000) + +#define ASID_INC 0x10 +#define ASID_MASK 0xff0 + +#elif defined(CONFIG_MIPS_MT_SMTC) + +#define ASID_INC 0x1 +extern unsigned long smtc_asid_mask; +#define ASID_MASK (smtc_asid_mask) +#define HW_ASID_MASK 0xff +/* End SMTC/34K debug hack */ +#else /* FIXME: not correct for R6000 */ + +#define ASID_INC 0x1 +#define ASID_MASK 0xff -#ifdef CONFIG_MIPS_MT_SMTC -#define SMTC_HW_ASID_MASK 0xff -extern unsigned int smtc_asid_mask; #endif #define cpu_context(cpu, mm) ((mm)->context.asid[cpu]) -#define cpu_asid(cpu, mm) ASID_MASK(cpu_context((cpu), (mm))) +#define cpu_asid(cpu, mm) (cpu_context((cpu), (mm)) & ASID_MASK) #define asid_cache(cpu) (cpu_data[cpu].asid_cache) static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk) { } +/* + * All unused by hardware upper bits will be considered + * as a software asid extension. + */ +#define ASID_VERSION_MASK ((unsigned long)~(ASID_MASK|(ASID_MASK-1))) +#define ASID_FIRST_VERSION ((unsigned long)(~ASID_VERSION_MASK) + 1) + #ifndef CONFIG_MIPS_MT_SMTC /* Normal, classic MIPS get_new_mmu_context */ static inline void @@ -137,7 +114,7 @@ get_new_mmu_context(struct mm_struct *mm, unsigned long cpu) extern void kvm_local_flush_tlb_all(void); unsigned long asid = asid_cache(cpu); - if (!ASID_MASK((asid = ASID_INC(asid)))) { + if (! ((asid += ASID_INC) & ASID_MASK) ) { if (cpu_has_vtag_icache) flush_icache_all(); #ifdef CONFIG_VIRTUALIZATION @@ -200,7 +177,7 @@ static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, * free up the ASID value for use and flush any old * instances of it from the TLB. */ - oldasid = ASID_MASK(read_c0_entryhi()); + oldasid = (read_c0_entryhi() & ASID_MASK); if(smtc_live_asid[mytlb][oldasid]) { smtc_live_asid[mytlb][oldasid] &= ~(0x1 << cpu); if(smtc_live_asid[mytlb][oldasid] == 0) @@ -211,7 +188,7 @@ static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, * having ASID_MASK smaller than the hardware maximum, * make sure no "soft" bits become "hard"... */ - write_c0_entryhi((read_c0_entryhi() & ~SMTC_HW_ASID_MASK) | + write_c0_entryhi((read_c0_entryhi() & ~HW_ASID_MASK) | cpu_asid(cpu, next)); ehb(); /* Make sure it propagates to TCStatus */ evpe(mtflags); @@ -264,15 +241,15 @@ activate_mm(struct mm_struct *prev, struct mm_struct *next) #ifdef CONFIG_MIPS_MT_SMTC /* See comments for similar code above */ mtflags = dvpe(); - oldasid = ASID_MASK(read_c0_entryhi()); + oldasid = read_c0_entryhi() & ASID_MASK; if(smtc_live_asid[mytlb][oldasid]) { smtc_live_asid[mytlb][oldasid] &= ~(0x1 << cpu); if(smtc_live_asid[mytlb][oldasid] == 0) smtc_flush_tlb_asid(oldasid); } /* See comments for similar code above */ - write_c0_entryhi((read_c0_entryhi() & ~SMTC_HW_ASID_MASK) | - cpu_asid(cpu, next)); + write_c0_entryhi((read_c0_entryhi() & ~HW_ASID_MASK) | + cpu_asid(cpu, next)); ehb(); /* Make sure it propagates to TCStatus */ evpe(mtflags); #else @@ -309,14 +286,14 @@ drop_mmu_context(struct mm_struct *mm, unsigned cpu) #ifdef CONFIG_MIPS_MT_SMTC /* See comments for similar code above */ prevvpe = dvpe(); - oldasid = ASID_MASK(read_c0_entryhi()); + oldasid = (read_c0_entryhi() & ASID_MASK); if (smtc_live_asid[mytlb][oldasid]) { smtc_live_asid[mytlb][oldasid] &= ~(0x1 << cpu); if(smtc_live_asid[mytlb][oldasid] == 0) smtc_flush_tlb_asid(oldasid); } /* See comments for similar code above */ - write_c0_entryhi((read_c0_entryhi() & ~SMTC_HW_ASID_MASK) + write_c0_entryhi((read_c0_entryhi() & ~HW_ASID_MASK) | cpu_asid(cpu, mm)); ehb(); /* Make sure it propagates to TCStatus */ evpe(prevvpe); -- cgit v1.2.3