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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2011-03-17 19:34:12 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-03-17 19:34:12 -0700 |
| commit | 08351fc6a75731226e1112fc7254542bd3a2912e (patch) | |
| tree | 8b25bd168e0663c766f0332c8be082aa7d6ed265 /arch/tile | |
| parent | 0df0914d414a504b975f3cc66ace0c16ef55b7f3 (diff) | |
| parent | 0dccb0489f9a5a13a33e828ab965aa49685d12f8 (diff) | |
| download | linux-08351fc6a75731226e1112fc7254542bd3a2912e.tar.gz linux-08351fc6a75731226e1112fc7254542bd3a2912e.tar.bz2 linux-08351fc6a75731226e1112fc7254542bd3a2912e.zip | |
Merge git://git.kernel.org/pub/scm/linux/kernel/git/cmetcalf/linux-tile
* git://git.kernel.org/pub/scm/linux/kernel/git/cmetcalf/linux-tile: (27 commits)
arch/tile: support newer binutils assembler shift semantics
arch/tile: fix deadlock bugs in rwlock implementation
drivers/edac: provide support for tile architecture
tile on-chip network driver: sync up with latest fixes
arch/tile: support 4KB page size as well as 64KB
arch/tile: add some more VMSPLIT options and use consistent naming
arch/tile: fix some comments and whitespace
arch/tile: export some additional module symbols
arch/tile: enhance existing finv_buffer_remote() routine
arch/tile: fix two bugs in the backtracer code
arch/tile: use extended assembly to inline __mb_incoherent()
arch/tile: use a cleaner technique to enable interrupt for cpu_idle()
arch/tile: sync up with <arch/sim.h> and <arch/sim_def.h> changes
arch/tile: fix reversed test of strict_strtol() return value
arch/tile: avoid a simulator warning during bootup
arch/tile: export <asm/hardwall.h> to userspace
arch/tile: warn and retry if an IPI is not accepted by the target cpu
arch/tile: stop disabling INTCTRL_1 interrupts during hypervisor downcalls
arch/tile: fix __ndelay etc to work better
arch/tile: bug fix: exec'ed task thought it was still single-stepping
...
Fix up trivial conflict in arch/tile/kernel/vmlinux.lds.S (percpu
alignment vs section naming convention fix)
Diffstat (limited to 'arch/tile')
52 files changed, 865 insertions, 557 deletions
diff --git a/arch/tile/Kconfig b/arch/tile/Kconfig index 08948e4e1503..f3b78701c219 100644 --- a/arch/tile/Kconfig +++ b/arch/tile/Kconfig @@ -1,5 +1,5 @@ # For a description of the syntax of this configuration file, -# see Documentation/kbuild/config-language.txt. +# see Documentation/kbuild/kconfig-language.txt. config TILE def_bool y @@ -11,17 +11,18 @@ config TILE select HAVE_GENERIC_HARDIRQS select GENERIC_IRQ_PROBE select GENERIC_PENDING_IRQ if SMP + select GENERIC_HARDIRQS_NO_DEPRECATED # FIXME: investigate whether we need/want these options. # select HAVE_IOREMAP_PROT -# select HAVE_OPTPROBES -# select HAVE_REGS_AND_STACK_ACCESS_API -# select HAVE_HW_BREAKPOINT -# select PERF_EVENTS -# select HAVE_USER_RETURN_NOTIFIER -# config NO_BOOTMEM -# config ARCH_SUPPORTS_DEBUG_PAGEALLOC -# config HUGETLB_PAGE_SIZE_VARIABLE +# select HAVE_OPTPROBES +# select HAVE_REGS_AND_STACK_ACCESS_API +# select HAVE_HW_BREAKPOINT +# select PERF_EVENTS +# select HAVE_USER_RETURN_NOTIFIER +# config NO_BOOTMEM +# config ARCH_SUPPORTS_DEBUG_PAGEALLOC +# config HUGETLB_PAGE_SIZE_VARIABLE config MMU def_bool y @@ -39,7 +40,7 @@ config HAVE_SETUP_PER_CPU_AREA def_bool y config NEED_PER_CPU_PAGE_FIRST_CHUNK - def_bool y + def_bool y config SYS_SUPPORTS_HUGETLBFS def_bool y @@ -201,12 +202,6 @@ config NODES_SHIFT By default, 2, i.e. 2^2 == 4 DDR2 controllers. In a system with more controllers, this value should be raised. -# Need 16MB areas to enable hugetlb -# See build-time check in arch/tile/mm/init.c. -config FORCE_MAX_ZONEORDER - int - default 9 - choice depends on !TILEGX prompt "Memory split" if EXPERT @@ -233,8 +228,12 @@ choice bool "3.5G/0.5G user/kernel split" config VMSPLIT_3G bool "3G/1G user/kernel split" - config VMSPLIT_3G_OPT - bool "3G/1G user/kernel split (for full 1G low memory)" + config VMSPLIT_2_75G + bool "2.75G/1.25G user/kernel split (for full 1G low memory)" + config VMSPLIT_2_5G + bool "2.5G/1.5G user/kernel split" + config VMSPLIT_2_25G + bool "2.25G/1.75G user/kernel split" config VMSPLIT_2G bool "2G/2G user/kernel split" config VMSPLIT_1G @@ -245,7 +244,9 @@ config PAGE_OFFSET hex default 0xF0000000 if VMSPLIT_3_75G default 0xE0000000 if VMSPLIT_3_5G - default 0xB0000000 if VMSPLIT_3G_OPT + default 0xB0000000 if VMSPLIT_2_75G + default 0xA0000000 if VMSPLIT_2_5G + default 0x90000000 if VMSPLIT_2_25G default 0x80000000 if VMSPLIT_2G default 0x40000000 if VMSPLIT_1G default 0xC0000000 diff --git a/arch/tile/include/arch/interrupts_32.h b/arch/tile/include/arch/interrupts_32.h index 9d0bfa7e59be..96b5710505b6 100644 --- a/arch/tile/include/arch/interrupts_32.h +++ b/arch/tile/include/arch/interrupts_32.h @@ -16,10 +16,11 @@ #define __ARCH_INTERRUPTS_H__ /** Mask for an interrupt. */ -#ifdef __ASSEMBLER__ /* Note: must handle breaking interrupts into high and low words manually. */ -#define INT_MASK(intno) (1 << (intno)) -#else +#define INT_MASK_LO(intno) (1 << (intno)) +#define INT_MASK_HI(intno) (1 << ((intno) - 32)) + +#ifndef __ASSEMBLER__ #define INT_MASK(intno) (1ULL << (intno)) #endif @@ -89,6 +90,7 @@ #define NUM_INTERRUPTS 49 +#ifndef __ASSEMBLER__ #define QUEUED_INTERRUPTS ( \ INT_MASK(INT_MEM_ERROR) | \ INT_MASK(INT_DMATLB_MISS) | \ @@ -301,4 +303,5 @@ INT_MASK(INT_DOUBLE_FAULT) | \ INT_MASK(INT_AUX_PERF_COUNT) | \ 0) +#endif /* !__ASSEMBLER__ */ #endif /* !__ARCH_INTERRUPTS_H__ */ diff --git a/arch/tile/include/arch/sim.h b/arch/tile/include/arch/sim.h index 74b7c1624d34..e54b7b0527f3 100644 --- a/arch/tile/include/arch/sim.h +++ b/arch/tile/include/arch/sim.h @@ -152,16 +152,33 @@ sim_dump(unsigned int mask) /** * Print a string to the simulator stdout. * - * @param str The string to be written; a newline is automatically added. + * @param str The string to be written. + */ +static __inline void +sim_print(const char* str) +{ + for ( ; *str != '\0'; str++) + { + __insn_mtspr(SPR_SIM_CONTROL, SIM_CONTROL_PUTC | + (*str << _SIM_CONTROL_OPERATOR_BITS)); + } + __insn_mtspr(SPR_SIM_CONTROL, SIM_CONTROL_PUTC | + (SIM_PUTC_FLUSH_BINARY << _SIM_CONTROL_OPERATOR_BITS)); +} + + +/** + * Print a string to the simulator stdout. + * + * @param str The string to be written (a newline is automatically added). */ static __inline void sim_print_string(const char* str) { - int i; - for (i = 0; str[i] != 0; i++) + for ( ; *str != '\0'; str++) { __insn_mtspr(SPR_SIM_CONTROL, SIM_CONTROL_PUTC | - (str[i] << _SIM_CONTROL_OPERATOR_BITS)); + (*str << _SIM_CONTROL_OPERATOR_BITS)); } __insn_mtspr(SPR_SIM_CONTROL, SIM_CONTROL_PUTC | (SIM_PUTC_FLUSH_STRING << _SIM_CONTROL_OPERATOR_BITS)); @@ -203,7 +220,7 @@ sim_command(const char* str) * we are passing to the simulator are actually valid in the registers * (i.e. returned from memory) prior to the SIM_CONTROL spr. */ -static __inline int _sim_syscall0(int val) +static __inline long _sim_syscall0(int val) { long result; __asm__ __volatile__ ("mtspr SIM_CONTROL, r0" @@ -211,7 +228,7 @@ static __inline int _sim_syscall0(int val) return result; } -static __inline int _sim_syscall1(int val, long arg1) +static __inline long _sim_syscall1(int val, long arg1) { long result; __asm__ __volatile__ ("{ and zero, r1, r1; mtspr SIM_CONTROL, r0 }" @@ -219,7 +236,7 @@ static __inline int _sim_syscall1(int val, long arg1) return result; } -static __inline int _sim_syscall2(int val, long arg1, long arg2) +static __inline long _sim_syscall2(int val, long arg1, long arg2) { long result; __asm__ __volatile__ ("{ and zero, r1, r2; mtspr SIM_CONTROL, r0 }" @@ -233,7 +250,7 @@ static __inline int _sim_syscall2(int val, long arg1, long arg2) the register values for arguments 3 and up may still be in flight to the core from a stack frame reload. */ -static __inline int _sim_syscall3(int val, long arg1, long arg2, long arg3) +static __inline long _sim_syscall3(int val, long arg1, long arg2, long arg3) { long result; __asm__ __volatile__ ("{ and zero, r3, r3 };" @@ -244,7 +261,7 @@ static __inline int _sim_syscall3(int val, long arg1, long arg2, long arg3) return result; } -static __inline int _sim_syscall4(int val, long arg1, long arg2, long arg3, +static __inline long _sim_syscall4(int val, long arg1, long arg2, long arg3, long arg4) { long result; @@ -256,7 +273,7 @@ static __inline int _sim_syscall4(int val, long arg1, long arg2, long arg3, return result; } -static __inline int _sim_syscall5(int val, long arg1, long arg2, long arg3, +static __inline long _sim_syscall5(int val, long arg1, long arg2, long arg3, long arg4, long arg5) { long result; @@ -268,7 +285,6 @@ static __inline int _sim_syscall5(int val, long arg1, long arg2, long arg3, return result; } - /** * Make a special syscall to the simulator itself, if running under * simulation. This is used as the implementation of other functions @@ -281,7 +297,8 @@ static __inline int _sim_syscall5(int val, long arg1, long arg2, long arg3, */ #define _sim_syscall(syscall_num, nr, args...) \ _sim_syscall##nr( \ - ((syscall_num) << _SIM_CONTROL_OPERATOR_BITS) | SIM_CONTROL_SYSCALL, args) + ((syscall_num) << _SIM_CONTROL_OPERATOR_BITS) | SIM_CONTROL_SYSCALL, \ + ##args) /* Values for the "access_mask" parameters below. */ @@ -365,6 +382,13 @@ sim_validate_lines_evicted(unsigned long long pa, unsigned long length) } +/* Return the current CPU speed in cycles per second. */ +static __inline long +sim_query_cpu_speed(void) +{ + return _sim_syscall(SIM_SYSCALL_QUERY_CPU_SPEED, 0); +} + #endif /* !__DOXYGEN__ */ diff --git a/arch/tile/include/arch/sim_def.h b/arch/tile/include/arch/sim_def.h index 7a17082c3773..4b44a2b6a09a 100644 --- a/arch/tile/include/arch/sim_def.h +++ b/arch/tile/include/arch/sim_def.h @@ -243,6 +243,9 @@ */ #define SIM_SYSCALL_VALIDATE_LINES_EVICTED 5 +/** Syscall number for sim_query_cpu_speed(). */ +#define SIM_SYSCALL_QUERY_CPU_SPEED 6 + /* * Bit masks which can be shifted by 8, combined with diff --git a/arch/tile/include/asm/Kbuild b/arch/tile/include/asm/Kbuild index 3b8f55b82dee..849ab2fa1f5c 100644 --- a/arch/tile/include/asm/Kbuild +++ b/arch/tile/include/asm/Kbuild @@ -1,3 +1,4 @@ include include/asm-generic/Kbuild.asm header-y += ucontext.h +header-y += hardwall.h diff --git a/arch/tile/include/asm/atomic.h b/arch/tile/include/asm/atomic.h index b8c49f98a44c..75a16028a952 100644 --- a/arch/tile/include/asm/atomic.h +++ b/arch/tile/include/asm/atomic.h @@ -32,7 +32,7 @@ */ static inline int atomic_read(const atomic_t *v) { - return v->counter; + return ACCESS_ONCE(v->counter); } /** diff --git a/arch/tile/include/asm/bitops_32.h b/arch/tile/include/asm/bitops_32.h index 7a93c001ac19..2638be51a164 100644 --- a/arch/tile/include/asm/bitops_32.h +++ b/arch/tile/include/asm/bitops_32.h @@ -122,7 +122,7 @@ static inline int test_and_change_bit(unsigned nr, return (_atomic_xor(addr, mask) & mask) != 0; } -/* See discussion at smp_mb__before_atomic_dec() in <asm/atomic.h>. */ +/* See discussion at smp_mb__before_atomic_dec() in <asm/atomic_32.h>. */ #define smp_mb__before_clear_bit() smp_mb() #define smp_mb__after_clear_bit() do {} while (0) diff --git a/arch/tile/include/asm/cache.h b/arch/tile/include/asm/cache.h index 08a2815b5e4e..392e5333dd8b 100644 --- a/arch/tile/include/asm/cache.h +++ b/arch/tile/include/asm/cache.h @@ -40,7 +40,7 @@ #define INTERNODE_CACHE_BYTES L2_CACHE_BYTES /* Group together read-mostly things to avoid cache false sharing */ -#define __read_mostly __attribute__((__section__(".data.read_mostly"))) +#define __read_mostly __attribute__((__section__(".data..read_mostly"))) /* * Attribute for data that is kept read/write coherent until the end of diff --git a/arch/tile/include/asm/cacheflush.h b/arch/tile/include/asm/cacheflush.h index 14a3f8556ace..12fb0fb330ee 100644 --- a/arch/tile/include/asm/cacheflush.h +++ b/arch/tile/include/asm/cacheflush.h @@ -138,55 +138,12 @@ static inline void finv_buffer(void *buffer, size_t size) } /* - * Flush & invalidate a VA range that is homed remotely on a single core, - * waiting until the memory controller holds the flushed values. + * Flush and invalidate a VA range that is homed remotely, waiting + * until the memory controller holds the flushed values. If "hfh" is + * true, we will do a more expensive flush involving additional loads + * to make sure we have touched all the possible home cpus of a buffer + * that is homed with "hash for home". */ -static inline void finv_buffer_remote(void *buffer, size_t size) -{ - char *p; - int i; - - /* - * Flush and invalidate the buffer out of the local L1/L2 - * and request the home cache to flush and invalidate as well. - */ - __finv_buffer(buffer, size); - - /* - * Wait for the home cache to acknowledge that it has processed - * all the flush-and-invalidate requests. This does not mean - * that the flushed data has reached the memory controller yet, - * but it does mean the home cache is processing the flushes. - */ - __insn_mf(); - - /* - * Issue a load to the last cache line, which can't complete - * until all the previously-issued flushes to the same memory - * controller have also completed. If we weren't striping - * memory, that one load would be sufficient, but since we may - * be, we also need to back up to the last load issued to - * another memory controller, which would be the point where - * we crossed an 8KB boundary (the granularity of striping - * across memory controllers). Keep backing up and doing this - * until we are before the beginning of the buffer, or have - * hit all the controllers. - */ - for (i = 0, p = (char *)buffer + size - 1; - i < (1 << CHIP_LOG_NUM_MSHIMS()) && p >= (char *)buffer; - ++i) { - const unsigned long STRIPE_WIDTH = 8192; - - /* Force a load instruction to issue. */ - *(volatile char *)p; - - /* Jump to end of previous stripe. */ - p -= STRIPE_WIDTH; - p = (char *)((unsigned long)p | (STRIPE_WIDTH - 1)); - } - - /* Wait for the loads (and thus flushes) to have completed. */ - __insn_mf(); -} +void finv_buffer_remote(void *buffer, size_t size, int hfh); #endif /* _ASM_TILE_CACHEFLUSH_H */ diff --git a/arch/tile/include/asm/edac.h b/arch/tile/include/asm/edac.h new file mode 100644 index 000000000000..87fc83eeaffd --- /dev/null +++ b/arch/tile/include/asm/edac.h @@ -0,0 +1,29 @@ +/* + * Copyright 2011 Tilera Corporation. All Rights Reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation, version 2. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or + * NON INFRINGEMENT. See the GNU General Public License for + * more details. + */ + +#ifndef _ASM_TILE_EDAC_H +#define _ASM_TILE_EDAC_H + +/* ECC atomic, DMA, SMP and interrupt safe scrub function */ + +static inline void atomic_scrub(void *va, u32 size) +{ + /* + * These is nothing to be done here because CE is + * corrected by the mshim. + */ + return; +} + +#endif /* _ASM_TILE_EDAC_H */ diff --git a/arch/tile/include/asm/hugetlb.h b/arch/tile/include/asm/hugetlb.h index 0521c277bbde..d396d1805163 100644 --- a/arch/tile/include/asm/hugetlb.h +++ b/arch/tile/include/asm/hugetlb.h @@ -54,7 +54,7 @@ static inline void hugetlb_free_pgd_range(struct mmu_gather *tlb, static inline void set_huge_pte_at(struct mm_struct *mm, unsigned long addr, pte_t *ptep, pte_t pte) { - set_pte_order(ptep, pte, HUGETLB_PAGE_ORDER); + set_pte(ptep, pte); } static inline pte_t huge_ptep_get_and_clear(struct mm_struct *mm, diff --git a/arch/tile/include/asm/irqflags.h b/arch/tile/include/asm/irqflags.h index 641e4ff3d805..5db0ce54284d 100644 --- a/arch/tile/include/asm/irqflags.h +++ b/arch/tile/include/asm/irqflags.h @@ -18,6 +18,8 @@ #include <arch/interrupts.h> #include <arch/chip.h> +#if !defined(__tilegx__) && defined(__ASSEMBLY__) + /* * The set of interrupts we want to allow when interrupts are nominally * disabled. The remainder are effectively "NMI" interrupts from @@ -25,6 +27,16 @@ * interrupts (aka "non-queued") are not blocked by the mask in any case. */ #if CHIP_HAS_AUX_PERF_COUNTERS() +#define LINUX_MASKABLE_INTERRUPTS_HI \ + (~(INT_MASK_HI(INT_PERF_COUNT) | INT_MASK_HI(INT_AUX_PERF_COUNT))) +#else +#define LINUX_MASKABLE_INTERRUPTS_HI \ + (~(INT_MASK_HI(INT_PERF_COUNT))) +#endif + +#else + +#if CHIP_HAS_AUX_PERF_COUNTERS() #define LINUX_MASKABLE_INTERRUPTS \ (~(INT_MASK(INT_PERF_COUNT) | INT_MASK(INT_AUX_PERF_COUNT))) #else @@ -32,6 +44,8 @@ (~(INT_MASK(INT_PERF_COUNT))) #endif +#endif + #ifndef __ASSEMBLY__ /* NOTE: we can't include <linux/percpu.h> due to #include dependencies. */ @@ -224,11 +238,11 @@ DECLARE_PER_CPU(unsigned long long, interrupts_enabled_mask); #define IRQ_DISABLE(tmp0, tmp1) \ { \ movei tmp0, -1; \ - moveli tmp1, lo16(LINUX_MASKABLE_INTERRUPTS) \ + moveli tmp1, lo16(LINUX_MASKABLE_INTERRUPTS_HI) \ }; \ { \ mtspr SPR_INTERRUPT_MASK_SET_K_0, tmp0; \ - auli tmp1, tmp1, ha16(LINUX_MASKABLE_INTERRUPTS) \ + auli tmp1, tmp1, ha16(LINUX_MASKABLE_INTERRUPTS_HI) \ }; \ mtspr SPR_INTERRUPT_MASK_SET_K_1, tmp1 diff --git a/arch/tile/include/asm/page.h b/arch/tile/include/asm/page.h index 7979a45430d3..3eb53525bf9d 100644 --- a/arch/tile/include/asm/page.h +++ b/arch/tile/include/asm/page.h @@ -16,10 +16,11 @@ #define _ASM_TILE_PAGE_H #include <linux/const.h> +#include <hv/pagesize.h> /* PAGE_SHIFT and HPAGE_SHIFT determine the page sizes. */ -#define PAGE_SHIFT 16 -#define HPAGE_SHIFT 24 +#define PAGE_SHIFT HV_LOG2_PAGE_SIZE_SMALL +#define HPAGE_SHIFT HV_LOG2_PAGE_SIZE_LARGE #define PAGE_SIZE (_AC(1, UL) << PAGE_SHIFT) #define HPAGE_SIZE (_AC(1, UL) << HPAGE_SHIFT) @@ -29,25 +30,18 @@ #ifdef __KERNEL__ -#include <hv/hypervisor.h> -#include <arch/chip.h> - /* - * The {,H}PAGE_SHIFT values must match the HV_LOG2_PAGE_SIZE_xxx - * definitions in <hv/hypervisor.h>. We validate this at build time - * here, and again at runtime during early boot. We provide a - * separate definition since userspace doesn't have <hv/hypervisor.h>. - * - * Be careful to distinguish PAGE_SHIFT from HV_PTE_INDEX_PFN, since - * they are the same on i386 but not TILE. + * If the Kconfig doesn't specify, set a maximum zone order that + * is enough so that we can create huge pages from small pages given + * the respective sizes of the two page types. See <linux/mmzone.h>. */ -#if HV_LOG2_PAGE_SIZE_SMALL != PAGE_SHIFT -# error Small page size mismatch in Linux -#endif -#if HV_LOG2_PAGE_SIZE_LARGE != HPAGE_SHIFT -# error Huge page size mismatch in Linux +#ifndef CONFIG_FORCE_MAX_ZONEORDER +#define CONFIG_FORCE_MAX_ZONEORDER (HPAGE_SHIFT - PAGE_SHIFT + 1) #endif +#include <hv/hypervisor.h> +#include <arch/chip.h> + #ifndef __ASSEMBLY__ #include <linux/types.h> @@ -81,12 +75,6 @@ static inline void copy_user_page(void *to, void *from, unsigned long vaddr, * Hypervisor page tables are made of the same basic structure. */ -typedef __u64 pteval_t; -typedef __u64 pmdval_t; -typedef __u64 pudval_t; -typedef __u64 pgdval_t; -typedef __u64 pgprotval_t; - typedef HV_PTE pte_t; typedef HV_PTE pgd_t; typedef HV_PTE pgprot_t; diff --git a/arch/tile/include/asm/pgalloc.h b/arch/tile/include/asm/pgalloc.h index cf52791a5501..e919c0bdc22d 100644 --- a/arch/tile/include/asm/pgalloc.h +++ b/arch/tile/include/asm/pgalloc.h @@ -41,9 +41,9 @@ static inline void set_pmd(pmd_t *pmdp, pmd_t pmd) { #ifdef CONFIG_64BIT - set_pte_order(pmdp, pmd, L2_USER_PGTABLE_ORDER); + set_pte(pmdp, pmd); #else - set_pte_order(&pmdp->pud.pgd, pmd.pud.pgd, L2_USER_PGTABLE_ORDER); + set_pte(&pmdp->pud.pgd, pmd.pud.pgd); #endif } @@ -100,6 +100,9 @@ pte_t *get_prealloc_pte(unsigned long pfn); /* During init, we can shatter kernel huge pages if needed. */ void shatter_pmd(pmd_t *pmd); +/* After init, a more complex technique is required. */ +void shatter_huge_page(unsigned long addr); + #ifdef __tilegx__ /* We share a single page allocator for both L1 and L2 page tables. */ #if HV_L1_SIZE != HV_L2_SIZE diff --git a/arch/tile/include/asm/pgtable.h b/arch/tile/include/asm/pgtable.h index a6604e9485da..1a20b7ef8ea2 100644 --- a/arch/tile/include/asm/pgtable.h +++ b/arch/tile/include/asm/pgtable.h @@ -233,15 +233,23 @@ static inline void __pte_clear(pte_t *ptep) #define pgd_ERROR(e) \ pr_err("%s:%d: bad pgd 0x%016llx.\n", __FILE__, __LINE__, pgd_val(e)) +/* Return PA and protection info for a given kernel VA. */ +int va_to_cpa_and_pte(void *va, phys_addr_t *cpa, pte_t *pte); + +/* + * __set_pte() ensures we write the 64-bit PTE with 32-bit words in + * the right order on 32-bit platforms and also allows us to write + * hooks to check valid PTEs, etc., if we want. + */ +void __set_pte(pte_t *ptep, pte_t pte); + /* - * set_pte_order() sets the given PTE and also sanity-checks the + * set_pte() sets the given PTE and also sanity-checks the * requested PTE against the page homecaching. Unspecified parts * of the PTE are filled in when it is written to memory, i.e. all * caching attributes if "!forcecache", or the home cpu if "anyhome". */ -extern void set_pte_order(pte_t *ptep, pte_t pte, int order); - -#define set_pte(ptep, pteval) set_pte_order(ptep, pteval, 0) +extern void set_pte(pte_t *ptep, pte_t pte); #define set_pte_at(mm, addr, ptep, pteval) set_pte(ptep, pteval) #define set_pte_atomic(pteptr, pteval) set_pte(pteptr, pteval) @@ -293,21 +301,6 @@ extern void check_mm_caching(struct mm_struct *prev, struct mm_struct *next); #define __swp_entry_to_pte(swp) ((pte_t) { (((long long) ((swp).val)) << 32) }) /* - * clone_pgd_range(pgd_t *dst, pgd_t *src, int count); - * - * dst - pointer to pgd range anwhere on a pgd page - * src - "" - * count - the number of pgds to copy. - * - * dst and src can be on the same page, but the range must not overlap, - * and must not cross a page boundary. - */ -static inline void clone_pgd_range(pgd_t *dst, pgd_t *src, int count) -{ - memcpy(dst, src, count * sizeof(pgd_t)); -} - -/* * Conversion functions: convert a page and protection to a page entry, * and a page entry and page directory to the page they refer to. */ diff --git a/arch/tile/include/asm/pgtable_32.h b/arch/tile/include/asm/pgtable_32.h index 53ec34884744..9f98529761fd 100644 --- a/arch/tile/include/asm/pgtable_32.h +++ b/arch/tile/include/asm/pgtable_32.h @@ -24,6 +24,7 @@ #define PGDIR_SIZE HV_PAGE_SIZE_LARGE #define PGDIR_MASK (~(PGDIR_SIZE-1)) #define PTRS_PER_PGD (1 << (32 - PGDIR_SHIFT)) +#define SIZEOF_PGD (PTRS_PER_PGD * sizeof(pgd_t)) /* * The level-2 index is defined by the difference between the huge @@ -33,6 +34,7 @@ * this nomenclature is somewhat confusing. */ #define PTRS_PER_PTE (1 << (HV_LOG2_PAGE_SIZE_LARGE - HV_LOG2_PAGE_SIZE_SMALL)) +#define SIZEOF_PTE (PTRS_PER_PTE * sizeof(pte_t)) #ifndef __ASSEMBLY__ @@ -94,7 +96,6 @@ static inline int pgd_addr_invalid(unsigned long addr) */ #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG #define __HAVE_ARCH_PTEP_SET_WRPROTECT -#define __HAVE_ARCH_PTEP_GET_AND_CLEAR extern int ptep_test_and_clear_young(struct vm_area_struct *, unsigned long addr, pte_t *); @@ -110,6 +111,11 @@ static inline pte_t ptep_get_and_clear(struct mm_struct *mm, return pte; } +static inline void __set_pmd(pmd_t *pmdp, pmd_t pmdval) +{ + set_pte(&pmdp->pud.pgd, pmdval.pud.pgd); +} + /* Create a pmd from a PTFN. */ static inline pmd_t ptfn_pmd(unsigned long ptfn, pgprot_t prot) { diff --git a/arch/tile/include/asm/processor.h b/arch/tile/include/asm/processor.h index a9e7c8760334..e6889474038a 100644 --- a/arch/tile/include/asm/processor.h +++ b/arch/tile/include/asm/processor.h @@ -269,7 +269,6 @@ extern char chip_model[64]; /* Data on which physical memory controller corresponds to which NUMA node. */ extern int node_controller[]; - /* Do we dump information to the console when a user application crashes? */ extern int show_crashinfo; diff --git a/arch/tile/include/asm/ptrace.h b/arch/tile/include/asm/ptrace.h index ac6d343129d3..6be2246e015c 100644 --- a/arch/tile/include/asm/ptrace.h +++ b/arch/tile/include/asm/ptrace.h @@ -141,6 +141,9 @@ struct single_step_state { /* Single-step the instruction at regs->pc */ extern void single_step_once(struct pt_regs *regs); +/* Clean up after execve(). */ +extern void single_step_execve(void); + struct task_struct; extern void send_sigtrap(struct task_struct *tsk, struct pt_regs *regs, diff --git a/arch/tile/include/asm/spinlock_32.h b/arch/tile/include/asm/spinlock_32.h index 88efdde8dd2b..a8f2c6e31a87 100644 --- a/arch/tile/include/asm/spinlock_32.h +++ b/arch/tile/include/asm/spinlock_32.h @@ -78,13 +78,6 @@ void arch_spin_unlock_wait(arch_spinlock_t *lock); #define _RD_COUNT_SHIFT 24 #define _RD_COUNT_WIDTH 8 -/* Internal functions; do not use. */ -void arch_read_lock_slow(arch_rwlock_t *, u32); -int arch_read_trylock_slow(arch_rwlock_t *); -void arch_read_unlock_slow(arch_rwlock_t *); -void arch_write_lock_slow(arch_rwlock_t *, u32); -void arch_write_unlock_slow(arch_rwlock_t *, u32); - /** * arch_read_can_lock() - would read_trylock() succeed? */ @@ -104,94 +97,32 @@ static inline int arch_write_can_lock(arch_rwlock_t *rwlock) /** * arch_read_lock() - acquire a read lock. */ -static inline void arch_read_lock(arch_rwlock_t *rwlock) -{ - u32 val = __insn_tns((int *)&rwlock->lock); - if (unlikely(val << _RD_COUNT_WIDTH)) { - arch_read_lock_slow(rwlock, val); - return; - } - rwlock->lock = val + (1 << _RD_COUNT_SHIFT); -} +void arch_read_lock(arch_rwlock_t *rwlock); /** - * arch_read_lock() - acquire a write lock. + * arch_write_lock() - acquire a write lock. */ -static inline void arch_write_lock(arch_rwlock_t *rwlock) -{ - u32 val = __insn_tns((int *)&rwlock->lock); - if (unlikely(val != 0)) { - arch_write_lock_slow(rwlock, val); - return; - } - rwlock->lock = 1 << _WR_NEXT_SHIFT; -} +void arch_write_lock(arch_rwlock_t *rwlock); /** * arch_read_trylock() - try to acquire a read lock. */ -static inline int arch_read_trylock(arch_rwlock_t *rwlock) -{ - int locked; - u32 val = __insn_tns((int *)&rwlock->lock); - if (unlikely(val & 1)) - return arch_read_trylock_slow(rwlock); - locked = (val << _RD_COUNT_WIDTH) == 0; - rwlock->lock = val + (locked << _RD_COUNT_SHIFT); - return locked; -} +int arch_read_trylock(arch_rwlock_t *rwlock); /** * arch_write_trylock() - try to acquire a write lock. */ -static inline int arch_write_trylock(arch_rwlock_t *rwlock) -{ - u32 val = __insn_tns((int *)&rwlock->lock); - - /* - * If a tns is in progress, or there's a waiting or active locker, - * or active readers, we can't take the lock, so give up. - */ - if (unlikely(val != 0)) { - if (!(val & 1)) - rwlock->lock = val; - return 0; - } - - /* Set the "next" field to mark it locked. */ - rwlock->lock = 1 << _WR_NEXT_SHIFT; - return 1; -} +int arch_write_trylock(arch_rwlock_t *rwlock); /** * arch_read_unlock() - release a read lock. */ -static inline void arch_read_unlock(arch_rwlock_t *rwlock) -{ - u32 val; - mb(); /* guarantee anything modified under the lock is visible */ - val = __insn_tns((int *)&rwlock->lock); - if (unlikely(val & 1)) { - arch_read_unlock_slow(rwlock); - return; - } - rwlock->lock = val - (1 << _RD_COUNT_SHIFT); -} +void arch_read_unlock(arch_rwlock_t *rwlock); /** * arch_write_unlock() - release a write lock. */ -static inline void arch_write_unlock(arch_rwlock_t *rwlock) -{ - u32 val; - mb(); /* guarantee anything modified under the lock is visible */ - val = __insn_tns((int *)&rwlock->lock); - if (unlikely(val != (1 << _WR_NEXT_SHIFT))) { - arch_write_unlock_slow(rwlock, val); - return; - } - rwlock->lock = 0; -} +void arch_write_unlock(arch_rwlock_t *rwlock); #define arch_read_lock_flags(lock, flags) arch_read_lock(lock) #define arch_write_lock_flags(lock, flags) arch_write_lock(lock) diff --git a/arch/tile/include/asm/stack.h b/arch/tile/include/asm/stack.h index f908473c322d..4d97a2db932e 100644 --- a/arch/tile/include/asm/stack.h +++ b/arch/tile/include/asm/stack.h @@ -18,13 +18,14 @@ #include <linux/types.h> #include <linux/sched.h> #include <asm/backtrace.h> +#include <asm/page.h> #include <hv/hypervisor.h> /* Everything we need to keep track of a backtrace iteration */ struct KBacktraceIterator { BacktraceIterator it; struct task_struct *task; /* task we are backtracing */ - HV_PTE *pgtable; /* page table for user space access */ + pte_t *pgtable; /* page table for user space access */ int end; /* iteration complete. */ int new_context; /* new context is starting */ int profile; /* profiling, so stop on async intrpt */ diff --git a/arch/tile/include/asm/system.h b/arch/tile/include/asm/system.h index 5388850deeb2..23d1842f4839 100644 --- a/arch/tile/include/asm/system.h +++ b/arch/tile/include/asm/system.h @@ -90,7 +90,24 @@ #endif #if !CHIP_HAS_MF_WAITS_FOR_VICTIMS() -int __mb_incoherent(void); /* Helper routine for mb_incoherent(). */ +#include <hv/syscall_public.h> +/* + * Issue an uncacheable load to each memory controller, then + * wait until those loads have completed. + */ +static inline void __mb_incoherent(void) +{ + long clobber_r10; + asm volatile("swint2" + : "=R10" (clobber_r10) + : "R10" (HV_SYS_fence_incoherent) + : "r0", "r1", "r2", "r3", "r4", + "r5", "r6", "r7", "r8", "r9", + "r11", "r12", "r13", "r14", + "r15", "r16", "r17", "r18", "r19", + "r20", "r21", "r22", "r23", "r24", + "r25", "r26", "r27", "r28", "r29"); +} #endif /* Fence to guarantee visibility of stores to incoherent memory. */ diff --git a/arch/tile/include/asm/thread_info.h b/arch/tile/include/asm/thread_info.h index 3872f2b345d2..9e8e9c4dfa2a 100644 --- a/arch/tile/include/asm/thread_info.h +++ b/arch/tile/include/asm/thread_info.h @@ -68,6 +68,7 @@ struct thread_info { #else #define THREAD_SIZE_ORDER (0) #endif +#define THREAD_SIZE_PAGES (1 << THREAD_SIZE_ORDER) #define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER) #define LOG2_THREAD_SIZE (PAGE_SHIFT + THREAD_SIZE_ORDER) diff --git a/arch/tile/include/asm/timex.h b/arch/tile/include/asm/timex.h index 3baf5fc4c0a1..29921f0b86da 100644 --- a/arch/tile/include/asm/timex.h +++ b/arch/tile/include/asm/timex.h @@ -38,6 +38,9 @@ static inline cycles_t get_cycles(void) cycles_t get_clock_rate(void); +/* Convert nanoseconds to core clock cycles. */ +cycles_t ns2cycles(unsigned long nsecs); + /* Called at cpu initialization to set some low-level constants. */ void setup_clock(void); diff --git a/arch/tile/include/hv/drv_mshim_intf.h b/arch/tile/include/hv/drv_mshim_intf.h new file mode 100644 index 000000000000..c6ef3bdc55cf --- /dev/null +++ b/arch/tile/include/hv/drv_mshim_intf.h @@ -0,0 +1,50 @@ +/* + * Copyright 2011 Tilera Corporation. All Rights Reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation, version 2. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or + * NON INFRINGEMENT. See the GNU General Public License for + * more details. + */ + +/** + * @file drv_mshim_intf.h + * Interface definitions for the Linux EDAC memory controller driver. + */ + +#ifndef _SYS_HV_INCLUDE_DRV_MSHIM_INTF_H +#define _SYS_HV_INCLUDE_DRV_MSHIM_INTF_H + +/** Number of memory controllers in the public API. */ +#define TILE_MAX_MSHIMS 4 + +/** Memory info under each memory controller. */ +struct mshim_mem_info +{ + uint64_t mem_size; /**< Total memory size in bytes. */ + uint8_t mem_type; /**< Memory type, DDR2 or DDR3. */ + uint8_t mem_ecc; /**< Memory supports ECC. */ +}; + +/** + * DIMM error structure. + * For now, only correctable errors are counted and the mshim doesn't record + * the error PA. HV takes panic upon uncorrectable errors. + */ +struct mshim_mem_error +{ + uint32_t sbe_count; /**< Number of single-bit errors. */ +}; + +/** Read this offset to get the memory info per mshim. */ +#define MSHIM_MEM_INFO_OFF 0x100 + +/** Read this offset to check DIMM error. */ +#define MSHIM_MEM_ERROR_OFF 0x200 + +#endif /* _SYS_HV_INCLUDE_DRV_MSHIM_INTF_H */ diff --git a/arch/tile/include/hv/hypervisor.h b/arch/tile/include/hv/hypervisor.h index f672544cd4f9..1b8bf03d62a0 100644 --- a/arch/tile/include/hv/hypervisor.h +++ b/arch/tile/include/hv/hypervisor.h @@ -338,9 +338,10 @@ typedef int HV_Errno; #define HV_ENOTREADY -812 /**< Device not ready */ #define HV_EIO -813 /**< I/O error */ #define HV_ENOMEM -814 /**< Out of memory */ +#define HV_EAGAIN -815 /**< Try again */ #define HV_ERR_MAX -801 /**< Largest HV error code */ -#define HV_ERR_MIN -814 /**< Smallest HV error code */ +#define HV_ERR_MIN -815 /**< Smallest HV error code */ #ifndef __ASSEMBLER__ @@ -867,6 +868,43 @@ typedef struct */ HV_PhysAddrRange hv_inquire_physical(int idx); +/** Possible DIMM types. */ +typedef enum +{ + NO_DIMM = 0, /**< No DIMM */ + DDR2 = 1, /**< DDR2 */ + DDR3 = 2 /**< DDR3 */ +} HV_DIMM_Type; + +#ifdef __tilegx__ + +/** Log2 of minimum DIMM bytes supported by the memory controller. */ +#define HV_MSH_MIN_DIMM_SIZE_SHIFT 29 + +/** Max number of DIMMs contained by one memory controller. */ +#define HV_MSH_MAX_DIMMS 8 + +#else + +/** Log2 of minimum DIMM bytes supported by the memory controller. */ +#define HV_MSH_MIN_DIMM_SIZE_SHIFT 26 + +/** Max number of DIMMs contained by one memory controller. */ +#define HV_MSH_MAX_DIMMS 2 + +#endif + +/** Number of bits to right-shift to get the DIMM type. */ +#define HV_DIMM_TYPE_SHIFT 0 + +/** Bits to mask to get the DIMM type. */ +#define HV_DIMM_TYPE_MASK 0xf + +/** Number of bits to right-shift to get the DIMM size. */ +#define HV_DIMM_SIZE_SHIFT 4 + +/** Bits to mask to get the DIMM size. */ +#define HV_DIMM_SIZE_MASK 0xf /** Memory controller information. */ typedef struct @@ -964,6 +1002,11 @@ HV_ASIDRange hv_inquire_asid(int idx); /** Waits for at least the specified number of nanoseconds then returns. * + * NOTE: this deprecated function currently assumes a 750 MHz clock, + * and is thus not generally suitable for use. New code should call + * hv_sysconf(HV_SYSCONF_CPU_SPEED), compute a cycle count to wait for, + * and delay by looping while checking the cycle counter SPR. + * * @param nanosecs The number of nanoseconds to sleep. */ void hv_nanosleep(int nanosecs); @@ -1038,6 +1081,7 @@ int hv_console_write(HV_VirtAddr bytes, int len); * downcall: * * INT_MESSAGE_RCV_DWNCL (hypervisor message available) + * INT_DEV_INTR_DWNCL (device interrupt) * INT_DMATLB_MISS_DWNCL (DMA TLB miss) * INT_SNITLB_MISS_DWNCL (SNI TLB miss) * INT_DMATLB_ACCESS_DWNCL (DMA TLB access violation) diff --git a/arch/tile/kernel/entry.S b/arch/tile/kernel/entry.S index fd8dc42abdcb..431e9ae60488 100644 --- a/arch/tile/kernel/entry.S +++ b/arch/tile/kernel/entry.S @@ -38,12 +38,6 @@ STD_ENTRY(kernel_execve) jrp lr STD_ENDPROC(kernel_execve) -/* Delay a fixed number of cycles. */ -STD_ENTRY(__delay) - { addi r0, r0, -1; bnzt r0, . } - jrp lr - STD_ENDPROC(__delay) - /* * We don't run this function directly, but instead copy it to a page * we map into every user process. See vdso_setup(). @@ -97,23 +91,17 @@ STD_ENTRY(smp_nap) /* * Enable interrupts racelessly and then nap until interrupted. + * Architecturally, we are guaranteed that enabling interrupts via + * mtspr to INTERRUPT_CRITICAL_SECTION only interrupts at the next PC. * This function's _cpu_idle_nap address is special; see intvec.S. * When interrupted at _cpu_idle_nap, we bump the PC forward 8, and * as a result return to the function that called _cpu_idle(). */ STD_ENTRY(_cpu_idle) - { - lnk r0 - movei r1, KERNEL_PL - } - { - addli r0, r0, _cpu_idle_nap - . - mtspr INTERRUPT_CRITICAL_SECTION, r1 - } + movei r1, 1 + mtspr INTERRUPT_CRITICAL_SECTION, r1 IRQ_ENABLE(r2, r3) /* unmask, but still with ICS set */ - mtspr SPR_EX_CONTEXT_K_1, r1 /* Kernel PL, ICS clear */ - mtspr SPR_EX_CONTEXT_K_0, r0 - iret + mtspr INTERRUPT_CRITICAL_SECTION, zero .global _cpu_idle_nap _cpu_idle_nap: nap diff --git a/arch/tile/kernel/head_32.S b/arch/tile/kernel/head_32.S index 90e7c4435693..1a39b7c1c87e 100644 --- a/arch/tile/kernel/head_32.S +++ b/arch/tile/kernel/head_32.S @@ -133,7 +133,7 @@ ENTRY(_start) } ENDPROC(_start) -.section ".bss.page_aligned","w" +__PAGE_ALIGNED_BSS .align PAGE_SIZE ENTRY(empty_zero_page) .fill PAGE_SIZE,1,0 @@ -145,10 +145,10 @@ ENTRY(empty_zero_page) .endif .word HV_PTE_PAGE | HV_PTE_DIRTY | HV_PTE_PRESENT | HV_PTE_ACCESSED | \ (HV_PTE_MODE_CACHE_NO_L3 << HV_PTE_INDEX_MODE) - .word (\bits1) | (HV_CPA_TO_PFN(\cpa) << HV_PTE_INDEX_PFN) + .word (\bits1) | (HV_CPA_TO_PFN(\cpa) << (HV_PTE_INDEX_PFN - 32)) .endm -.section ".data.page_aligned","wa" +__PAGE_ALIGNED_DATA .align PAGE_SIZE ENTRY(swapper_pg_dir) /* @@ -158,12 +158,14 @@ ENTRY(swapper_pg_dir) */ .set addr, 0 .rept (MEM_USER_INTRPT - PAGE_OFFSET) >> PGDIR_SHIFT - PTE addr + PAGE_OFFSET, addr, HV_PTE_READABLE | HV_PTE_WRITABLE + PTE addr + PAGE_OFFSET, addr, (1 << (HV_PTE_INDEX_READABLE - 32)) | \ + (1 << (HV_PTE_INDEX_WRITABLE - 32)) .set addr, addr + PGDIR_SIZE .endr /* The true text VAs are mapped as VA = PA + MEM_SV_INTRPT */ - PTE MEM_SV_INTRPT, 0, HV_PTE_READABLE | HV_PTE_EXECUTABLE + PTE MEM_SV_INTRPT, 0, (1 << (HV_PTE_INDEX_READABLE - 32)) | \ + (1 << (HV_PTE_INDEX_EXECUTABLE - 32)) .org swapper_pg_dir + HV_L1_SIZE END(swapper_pg_dir) @@ -176,6 +178,7 @@ ENTRY(swapper_pg_dir) __INITDATA .align CHIP_L2_LINE_SIZE() ENTRY(swapper_pgprot) - PTE 0, 0, HV_PTE_READABLE | HV_PTE_WRITABLE, 1 + PTE 0, 0, (1 << (HV_PTE_INDEX_READABLE - 32)) | \ + (1 << (HV_PTE_INDEX_WRITABLE - 32)), 1 .align CHIP_L2_LINE_SIZE() END(swapper_pgprot) diff --git a/arch/tile/kernel/intvec_32.S b/arch/tile/kernel/intvec_32.S index 5eed4a02bf62..fffcfa6b3a62 100644 --- a/arch/tile/kernel/intvec_32.S +++ b/arch/tile/kernel/intvec_32.S @@ -32,10 +32,6 @@ # error "No support for kernel preemption currently" #endif -#if INT_INTCTRL_K < 32 || INT_INTCTRL_K >= 48 -# error INT_INTCTRL_K coded to set high interrupt mask -#endif - #define PTREGS_PTR(reg, ptreg) addli reg, sp, C_ABI_SAVE_AREA_SIZE + (ptreg) #define PTREGS_OFFSET_SYSCALL PTREGS_OFFSET_REG(TREG_SYSCALL_NR) @@ -1199,46 +1195,6 @@ STD_ENTRY(interrupt_return) STD_ENDPROC(interrupt_return) /* - * This interrupt variant clears the INT_INTCTRL_K interrupt mask bit - * before returning, so we can properly get more downcalls. - */ - .pushsection .text.handle_interrupt_downcall,"ax" -handle_interrupt_downcall: - finish_interrupt_save handle_interrupt_downcall - check_single_stepping normal, .Ldispatch_downcall -.Ldispatch_downcall: - - /* Clear INTCTRL_K from the set of interrupts we ever enable. */ - GET_INTERRUPTS_ENABLED_MASK_PTR(r30) - { - addi r30, r30, 4 - movei r31, INT_MASK(INT_INTCTRL_K) - } - { - lw r20, r30 - nor r21, r31, zero - } - and r20, r20, r21 - sw r30, r20 - - { - jalr r0 - PTREGS_PTR(r0, PTREGS_OFFSET_BASE) - } - FEEDBACK_REENTER(handle_interrupt_downcall) - - /* Allow INTCTRL_K to be enabled next time we enable interrupts. */ - lw r20, r30 - or r20, r20, r31 - sw r30, r20 - - { - movei r30, 0 /* not an NMI */ - j interrupt_return - } - STD_ENDPROC(handle_interrupt_downcall) - - /* * Some interrupts don't check for single stepping */ .pushsection .text.handle_interrupt_no_single_step,"ax" @@ -1600,7 +1556,10 @@ STD_ENTRY(_sys_clone) .align 64 /* Align much later jump on the start of a cache line. */ #if !ATOMIC_LOCKS_FOUND_VIA_TABLE() - nop; nop + nop +#if PAGE_SIZE >= 0x10000 + nop +#endif #endif ENTRY(sys_cmpxchg) @@ -1628,9 +1587,13 @@ ENTRY(sys_cmpxchg) * about aliasing among multiple mappings of the same physical page, * and we ignore the low 3 bits so we have one lock that covers * both a cmpxchg64() and a cmpxchg() on either its low or high word. - * NOTE: this code must match __atomic_hashed_lock() in lib/atomic.c. + * NOTE: this must match __atomic_hashed_lock() in lib/atomic_32.c. */ +#if (PAGE_OFFSET & 0xffff) != 0 +# error Code here assumes PAGE_OFFSET can be loaded with just hi16() +#endif + #if ATOMIC_LOCKS_FOUND_VIA_TABLE() { /* Check for unaligned input. */ @@ -1723,11 +1686,14 @@ ENTRY(sys_cmpxchg) lw r26, r0 } { - /* atomic_locks is page aligned so this suffices to get its addr. */ - auli r21, zero, hi16(atomic_locks) + auli r21, zero, ha16(atomic_locks) bbns r23, .Lcmpxchg_badaddr } +#if PAGE_SIZE < 0x10000 + /* atomic_locks is page-aligned so for big pages we don't need this. */ + addli r21, r21, lo16(atomic_locks) +#endif { /* * Insert the hash bits into the page-aligned pointer. @@ -1762,7 +1728,7 @@ ENTRY(sys_cmpxchg) /* * Perform the actual cmpxchg or atomic_update. - * Note that __futex_mark_unlocked() in uClibc relies on + * Note that the system <arch/atomic.h> header relies on * atomic_update() to always perform an "mf", so don't make * it optional or conditional without modifying that code. */ @@ -2014,17 +1980,17 @@ int_unalign: #endif int_hand INT_INTCTRL_0, INTCTRL_0, bad_intr int_hand INT_MESSAGE_RCV_DWNCL, MESSAGE_RCV_DWNCL, \ - hv_message_intr, handle_interrupt_downcall + hv_message_intr int_hand INT_DEV_INTR_DWNCL, DEV_INTR_DWNCL, \ - tile_dev_intr, handle_interrupt_downcall + tile_dev_intr int_hand INT_I_ASID, I_ASID, bad_intr int_hand INT_D_ASID, D_ASID, bad_intr int_hand INT_DMATLB_MISS_DWNCL, DMATLB_MISS_DWNCL, \ - do_page_fault, handle_interrupt_downcall + do_page_fault int_hand INT_SNITLB_MISS_DWNCL, SNITLB_MISS_DWNCL, \ - do_page_fault, handle_interrupt_downcall + do_page_fault int_hand INT_DMATLB_ACCESS_DWNCL, DMATLB_ACCESS_DWNCL, \ - do_page_fault, handle_interrupt_downcall + do_page_fault int_hand INT_SN_CPL, SN_CPL, bad_intr int_hand INT_DOUBLE_FAULT, DOUBLE_FAULT, do_trap #if CHIP_HAS_AUX_PERF_COUNTERS() diff --git a/arch/tile/kernel/irq.c b/arch/tile/kernel/irq.c index 128805ef8f2c..0baa7580121f 100644 --- a/arch/tile/kernel/irq.c +++ b/arch/tile/kernel/irq.c @@ -176,43 +176,43 @@ void disable_percpu_irq(unsigned int irq) EXPORT_SYMBOL(disable_percpu_irq); /* Mask an interrupt. */ -static void tile_irq_chip_mask(unsigned int irq) +static void tile_irq_chip_mask(struct irq_data *d) { - mask_irqs(1UL << irq); + mask_irqs(1UL << d->irq); } /* Unmask an interrupt. */ -static void tile_irq_chip_unmask(unsigned int irq) +static void tile_irq_chip_unmask(struct irq_data *d) { - unmask_irqs(1UL << irq); + unmask_irqs(1UL << d->irq); } /* * Clear an interrupt before processing it so that any new assertions * will trigger another irq. */ -static void tile_irq_chip_ack(unsigned int irq) +static void tile_irq_chip_ack(struct irq_data *d) { - if ((unsigned long)get_irq_chip_data(irq) != IS_HW_CLEARED) - clear_irqs(1UL << irq); + if ((unsigned long)irq_data_get_irq_chip_data(d) != IS_HW_CLEARED) + clear_irqs(1UL << d->irq); } /* * For per-cpu interrupts, we need to avoid unmasking any interrupts * that we disabled via disable_percpu_irq(). */ -static void tile_irq_chip_eoi(unsigned int irq) +static void tile_irq_chip_eoi(struct irq_data *d) { - if (!(__get_cpu_var(irq_disable_mask) & (1UL << irq))) - unmask_irqs(1UL << irq); + if (!(__get_cpu_var(irq_disable_mask) & (1UL << d->irq))) + unmask_irqs(1UL << d->irq); } static struct irq_chip tile_irq_chip = { .name = "tile_irq_chip", - .ack = tile_irq_chip_ack, - .eoi = tile_irq_chip_eoi, - .mask = tile_irq_chip_mask, - .unmask = tile_irq_chip_unmask, + .irq_ack = tile_irq_chip_ack, + .irq_eoi = tile_irq_chip_eoi, + .irq_mask = tile_irq_chip_mask, + .irq_unmask = tile_irq_chip_unmask, }; void __init init_IRQ(void) @@ -277,8 +277,10 @@ int show_interrupts(struct seq_file *p, void *v) } if (i < NR_IRQS) { - raw_spin_lock_irqsave(&irq_desc[i].lock, flags); - action = irq_desc[i].action; + struct irq_desc *desc = irq_to_desc(i); + + raw_spin_lock_irqsave(&desc->lock, flags); + action = desc->action; if (!action) goto skip; seq_printf(p, "%3d: ", i); @@ -288,7 +290,7 @@ int show_interrupts(struct seq_file *p, void *v) for_each_online_cpu(j) seq_printf(p, "%10u ", kstat_irqs_cpu(i, j)); #endif - seq_printf(p, " %14s", irq_desc[i].chip->name); + seq_printf(p, " %14s", get_irq_desc_chip(desc)->name); seq_printf(p, " %s", action->name); for (action = action->next; action; action = action->next) @@ -296,7 +298,7 @@ int show_interrupts(struct seq_file *p, void *v) seq_putc(p, '\n'); skip: - raw_spin_unlock_irqrestore(&irq_desc[i].lock, flags); + raw_spin_unlock_irqrestore(&desc->lock, flags); } return 0; } diff --git a/arch/tile/kernel/machine_kexec.c b/arch/tile/kernel/machine_kexec.c index 0d8b9e933487..e00d7179989e 100644 --- a/arch/tile/kernel/machine_kexec.c +++ b/arch/tile/kernel/machine_kexec.c @@ -240,8 +240,11 @@ static void setup_quasi_va_is_pa(void) pte = hv_pte(_PAGE_KERNEL | _PAGE_HUGE_PAGE); pte = hv_pte_set_mode(pte, HV_PTE_MODE_CACHE_NO_L3); - for (i = 0; i < pgd_index(PAGE_OFFSET); i++) - pgtable[i] = pfn_pte(i << (HPAGE_SHIFT - PAGE_SHIFT), pte); + for (i = 0; i < pgd_index(PAGE_OFFSET); i++) { + unsigned long pfn = i << (HPAGE_SHIFT - PAGE_SHIFT); + if (pfn_valid(pfn)) + __set_pte(&pgtable[i], pfn_pte(pfn, pte)); + } } diff --git a/arch/tile/kernel/pci-dma.c b/arch/tile/kernel/pci-dma.c index 5ad5e13b0fa6..658752b2835e 100644 --- a/arch/tile/kernel/pci-dma.c +++ b/arch/tile/kernel/pci-dma.c @@ -86,6 +86,21 @@ EXPORT_SYMBOL(dma_free_coherent); * can count on nothing having been touched. */ +/* Flush a PA range from cache page by page. */ +static void __dma_map_pa_range(dma_addr_t dma_addr, size_t size) +{ + struct page *page = pfn_to_page(PFN_DOWN(dma_addr)); + size_t bytesleft = PAGE_SIZE - (dma_addr & (PAGE_SIZE - 1)); + + while ((ssize_t)size > 0) { + /* Flush the page. */ + homecache_flush_cache(page++, 0); + + /* Figure out if we need to continue on the next page. */ + size -= bytesleft; + bytesleft = PAGE_SIZE; + } +} /* * dma_map_single can be passed any memory address, and there appear @@ -97,26 +112,12 @@ EXPORT_SYMBOL(dma_free_coherent); dma_addr_t dma_map_single(struct device *dev, void *ptr, size_t size, enum dma_data_direction direction) { - struct page *page; - dma_addr_t dma_addr; - int thispage; + dma_addr_t dma_addr = __pa(ptr); BUG_ON(!valid_dma_direction(direction)); WARN_ON(size == 0); - dma_addr = __pa(ptr); - - /* We might have been handed a buffer that wraps a page boundary */ - while ((int)size > 0) { - /* The amount to flush that's on this page */ - thispage = PAGE_SIZE - ((unsigned long)ptr & (PAGE_SIZE - 1)); - thispage = min((int)thispage, (int)size); - /* Is this valid for any page we could be handed? */ - page = pfn_to_page(kaddr_to_pfn(ptr)); - homecache_flush_cache(page, 0); - ptr += thispage; - size -= thispage; - } + __dma_map_pa_range(dma_addr, size); return dma_addr; } @@ -140,10 +141,8 @@ int dma_map_sg(struct device *dev, struct scatterlist *sglist, int nents, WARN_ON(nents == 0 || sglist->length == 0); for_each_sg(sglist, sg, nents, i) { - struct page *page; sg->dma_address = sg_phys(sg); - page = pfn_to_page(sg->dma_address >> PAGE_SHIFT); - homecache_flush_cache(page, 0); + __dma_map_pa_range(sg->dma_address, sg->length); } return nents; @@ -163,6 +162,7 @@ dma_addr_t dma_map_page(struct device *dev, struct page *page, { BUG_ON(!valid_dma_direction(direction)); + BUG_ON(offset + size > PAGE_SIZE); homecache_flush_cache(page, 0); return page_to_pa(page) + offset; diff --git a/arch/tile/kernel/process.c b/arch/tile/kernel/process.c index e90eb53173b0..b9cd962e1d30 100644 --- a/arch/tile/kernel/process.c +++ b/arch/tile/kernel/process.c @@ -165,7 +165,7 @@ void free_thread_info(struct thread_info *info) kfree(step_state); } - free_page((unsigned long)info); + free_pages((unsigned long)info, THREAD_SIZE_ORDER); } static void save_arch_state(struct thread_struct *t); @@ -574,6 +574,8 @@ SYSCALL_DEFINE4(execve, const char __user *, path, goto out; error = do_execve(filename, argv, envp, regs); putname(filename); + if (error == 0) + single_step_execve(); out: return error; } @@ -593,6 +595,8 @@ long compat_sys_execve(const char __user *path, goto out; error = compat_do_execve(filename, argv, envp, regs); putname(filename); + if (error == 0) + single_step_execve(); out: return error; } diff --git a/arch/tile/kernel/setup.c b/arch/tile/kernel/setup.c index f18573643ed1..3696b1832566 100644 --- a/arch/tile/kernel/setup.c +++ b/arch/tile/kernel/setup.c @@ -59,6 +59,8 @@ unsigned long __initdata node_memmap_pfn[MAX_NUMNODES]; unsigned long __initdata node_percpu_pfn[MAX_NUMNODES]; unsigned long __initdata node_free_pfn[MAX_NUMNODES]; +static unsigned long __initdata node_percpu[MAX_NUMNODES]; + #ifdef CONFIG_HIGHMEM /* Page frame index of end of lowmem on each controller. */ unsigned long __cpuinitdata node_lowmem_end_pfn[MAX_NUMNODES]; @@ -554,7 +556,6 @@ static void __init setup_bootmem_allocator(void) reserve_bootmem(crashk_res.start, crashk_res.end - crashk_res.start + 1, 0); #endif - } void *__init alloc_remap(int nid, unsigned long size) @@ -568,11 +569,13 @@ void *__init alloc_remap(int nid, unsigned long size) static int __init percpu_size(void) { - int size = ALIGN(__per_cpu_end - __per_cpu_start, PAGE_SIZE); -#ifdef CONFIG_MODULES - if (size < PERCPU_ENOUGH_ROOM) - size = PERCPU_ENOUGH_ROOM; -#endif + int size = __per_cpu_end - __per_cpu_start; + size += PERCPU_MODULE_RESERVE; + size += PERCPU_DYNAMIC_EARLY_SIZE; + if (size < PCPU_MIN_UNIT_SIZE) + size = PCPU_MIN_UNIT_SIZE; + size = roundup(size, PAGE_SIZE); + /* In several places we assume the per-cpu data fits on a huge page. */ BUG_ON(kdata_huge && size > HPAGE_SIZE); return size; @@ -589,7 +592,6 @@ static inline unsigned long alloc_bootmem_pfn(int size, unsigned long goal) static void __init zone_sizes_init(void) { unsigned long zones_size[MAX_NR_ZONES] = { 0 }; - unsigned long node_percpu[MAX_NUMNODES] = { 0 }; int size = percpu_size(); int num_cpus = smp_height * smp_width; int i; @@ -674,7 +676,7 @@ static void __init zone_sizes_init(void) NODE_DATA(i)->bdata = NODE_DATA(0)->bdata; free_area_init_node(i, zones_size, start, NULL); - printk(KERN_DEBUG " DMA zone: %ld per-cpu pages\n", + printk(KERN_DEBUG " Normal zone: %ld per-cpu pages\n", PFN_UP(node_percpu[i])); /* Track the type of memory on each node */ @@ -1312,6 +1314,8 @@ static void *__init pcpu_fc_alloc(unsigned int cpu, size_t size, size_t align) BUG_ON(size % PAGE_SIZE != 0); pfn_offset[nid] += size / PAGE_SIZE; + BUG_ON(node_percpu[nid] < size); + node_percpu[nid] -= size; if (percpu_pfn[cpu] == 0) percpu_pfn[cpu] = pfn; return pfn_to_kaddr(pfn); diff --git a/arch/tile/kernel/single_step.c b/arch/tile/kernel/single_step.c index 1eb3b39e36c7..84a729e06ec4 100644 --- a/arch/tile/kernel/single_step.c +++ b/arch/tile/kernel/single_step.c @@ -56,7 +56,7 @@ enum mem_op { MEMOP_STORE_POSTINCR }; -static inline tile_bundle_bits set_BrOff_X1(tile_bundle_bits n, int32_t offset) +static inline tile_bundle_bits set_BrOff_X1(tile_bundle_bits n, s32 offset) { tile_bundle_bits result; @@ -254,6 +254,18 @@ P("\n"); return bundle; } +/* + * Called after execve() has started the new image. This allows us + * to reset the info state. Note that the the mmap'ed memory, if there + * was any, has already been unmapped by the exec. + */ +void single_step_execve(void) +{ + struct thread_info *ti = current_thread_info(); + kfree(ti->step_state); + ti->step_state = NULL; +} + /** * single_step_once() - entry point when single stepping has been triggered. * @regs: The machine register state @@ -373,7 +385,7 @@ void single_step_once(struct pt_regs *regs) /* branches */ case BRANCH_OPCODE_X1: { - int32_t offset = signExtend17(get_BrOff_X1(bundle)); + s32 offset = signExtend17(get_BrOff_X1(bundle)); /* * For branches, we use a rewriting trick to let the @@ -731,4 +743,9 @@ void single_step_once(struct pt_regs *regs) __insn_mtspr(SPR_SINGLE_STEP_EN_K_K, 1 << USER_PL); } +void single_step_execve(void) +{ + /* Nothing */ +} + #endif /* !__tilegx__ */ diff --git a/arch/tile/kernel/smp.c b/arch/tile/kernel/smp.c index 9575b37a8b75..a4293102ef81 100644 --- a/arch/tile/kernel/smp.c +++ b/arch/tile/kernel/smp.c @@ -36,6 +36,22 @@ static unsigned long __iomem *ipi_mappings[NR_CPUS]; /* Set by smp_send_stop() to avoid recursive panics. */ static int stopping_cpus; +static void __send_IPI_many(HV_Recipient *recip, int nrecip, int tag) +{ + int sent = 0; + while (sent < nrecip) { + int rc = hv_send_message(recip, nrecip, + (HV_VirtAddr)&tag, sizeof(tag)); + if (rc < 0) { + if (!stopping_cpus) /* avoid recursive panic */ + panic("hv_send_message returned %d", rc); + break; + } + WARN_ONCE(rc == 0, "hv_send_message() returned zero\n"); + sent += rc; + } +} + void send_IPI_single(int cpu, int tag) { HV_Recipient recip = { @@ -43,14 +59,13 @@ void send_IPI_single(int cpu, int tag) .x = cpu % smp_width, .state = HV_TO_BE_SENT }; - int rc = hv_send_message(&recip, 1, (HV_VirtAddr)&tag, sizeof(tag)); - BUG_ON(rc <= 0); + __send_IPI_many(&recip, 1, tag); } void send_IPI_many(const struct cpumask *mask, int tag) { HV_Recipient recip[NR_CPUS]; - int cpu, sent; + int cpu; int nrecip = 0; int my_cpu = smp_processor_id(); for_each_cpu(cpu, mask) { @@ -61,17 +76,7 @@ void send_IPI_many(const struct cpumask *mask, int tag) r->x = cpu % smp_width; r->state = HV_TO_BE_SENT; } - sent = 0; - while (sent < nrecip) { - int rc = hv_send_message(recip, nrecip, - (HV_VirtAddr)&tag, sizeof(tag)); - if (rc <= 0) { - if (!stopping_cpus) /* avoid recursive panic */ - panic("hv_send_message returned %d", rc); - break; - } - sent += rc; - } + __send_IPI_many(recip, nrecip, tag); } void send_IPI_allbutself(int tag) diff --git a/arch/tile/kernel/stack.c b/arch/tile/kernel/stack.c index 0d54106be3d6..dd81713a90dc 100644 --- a/arch/tile/kernel/stack.c +++ b/arch/tile/kernel/stack.c @@ -44,13 +44,6 @@ static int in_kernel_stack(struct KBacktraceIterator *kbt, VirtualAddress sp) return sp >= kstack_base && sp < kstack_base + THREAD_SIZE; } -/* Is address in the specified kernel code? */ -static int in_kernel_text(VirtualAddress address) -{ - return (address >= MEM_SV_INTRPT && - address < MEM_SV_INTRPT + HPAGE_SIZE); -} - /* Is address valid for reading? */ static int valid_address(struct KBacktraceIterator *kbt, VirtualAddress address) { @@ -63,6 +56,23 @@ static int valid_address(struct KBacktraceIterator *kbt, VirtualAddress address) if (l1_pgtable == NULL) return 0; /* can't read user space in other tasks */ +#ifdef CONFIG_64BIT + /* Find the real l1_pgtable by looking in the l0_pgtable. */ + pte = l1_pgtable[HV_L0_INDEX(address)]; + if (!hv_pte_get_present(pte)) + return 0; + pfn = hv_pte_get_pfn(pte); + if (pte_huge(pte)) { + if (!pfn_valid(pfn)) { + pr_err("L0 huge page has bad pfn %#lx\n", pfn); + return 0; + } + return hv_pte_get_present(pte) && hv_pte_get_readable(pte); + } + page = pfn_to_page(pfn); + BUG_ON(PageHighMem(page)); /* No HIGHMEM on 64-bit. */ + l1_pgtable = (HV_PTE *)pfn_to_kaddr(pfn); +#endif pte = l1_pgtable[HV_L1_INDEX(address)]; if (!hv_pte_get_present(pte)) return 0; @@ -92,7 +102,7 @@ static bool read_memory_func(void *result, VirtualAddress address, { int retval; struct KBacktraceIterator *kbt = (struct KBacktraceIterator *)vkbt; - if (in_kernel_text(address)) { + if (__kernel_text_address(address)) { /* OK to read kernel code. */ } else if (address >= PAGE_OFFSET) { /* We only tolerate kernel-space reads of this task's stack */ @@ -132,7 +142,7 @@ static struct pt_regs *valid_fault_handler(struct KBacktraceIterator* kbt) } } if (EX1_PL(p->ex1) == KERNEL_PL && - in_kernel_text(p->pc) && + __kernel_text_address(p->pc) && in_kernel_stack(kbt, p->sp) && p->sp >= sp) { if (kbt->verbose) diff --git a/arch/tile/kernel/time.c b/arch/tile/kernel/time.c index f2e156e44692..49a605be94c5 100644 --- a/arch/tile/kernel/time.c +++ b/arch/tile/kernel/time.c @@ -224,3 +224,13 @@ int setup_profiling_timer(unsigned int multiplier) { return -EINVAL; } + +/* + * Use the tile timer to convert nsecs to core clock cycles, relying + * on it having the same frequency as SPR_CYCLE. + */ +cycles_t ns2cycles(unsigned long nsecs) +{ + struct clock_event_device *dev = &__get_cpu_var(tile_timer); + return ((u64)nsecs * dev->mult) >> dev->shift; +} diff --git a/arch/tile/kernel/vmlinux.lds.S b/arch/tile/kernel/vmlinux.lds.S index c6ce378e0678..38f64fafdc10 100644 --- a/arch/tile/kernel/vmlinux.lds.S +++ b/arch/tile/kernel/vmlinux.lds.S @@ -59,10 +59,7 @@ SECTIONS . = ALIGN(PAGE_SIZE); VMLINUX_SYMBOL(_sinitdata) = .; - .init.page : AT (ADDR(.init.page) - LOAD_OFFSET) { - *(.init.page) - } :data =0 - INIT_DATA_SECTION(16) + INIT_DATA_SECTION(16) :data =0 PERCPU(L2_CACHE_BYTES, PAGE_SIZE) . = ALIGN(PAGE_SIZE); VMLINUX_SYMBOL(_einitdata) = .; diff --git a/arch/tile/lib/Makefile b/arch/tile/lib/Makefile index 93122d5b1558..0c26086ecbef 100644 --- a/arch/tile/lib/Makefile +++ b/arch/tile/lib/Makefile @@ -2,9 +2,8 @@ # Makefile for TILE-specific library files.. # -lib-y = cacheflush.o checksum.o cpumask.o delay.o \ - mb_incoherent.o uaccess.o memmove.o \ - memcpy_$(BITS).o memchr_$(BITS).o memset_$(BITS).o \ +lib-y = cacheflush.o checksum.o cpumask.o delay.o uaccess.o \ + memmove.o memcpy_$(BITS).o memchr_$(BITS).o memset_$(BITS).o \ strchr_$(BITS).o strlen_$(BITS).o ifeq ($(CONFIG_TILEGX),y) diff --git a/arch/tile/lib/atomic_32.c b/arch/tile/lib/atomic_32.c index 7a5cc706ab62..f02040d3614e 100644 --- a/arch/tile/lib/atomic_32.c +++ b/arch/tile/lib/atomic_32.c @@ -46,14 +46,13 @@ struct atomic_locks_on_cpu *atomic_lock_ptr[ATOMIC_HASH_L1_SIZE] #else /* ATOMIC_LOCKS_FOUND_VIA_TABLE() */ /* This page is remapped on startup to be hash-for-home. */ -int atomic_locks[PAGE_SIZE / sizeof(int) /* Only ATOMIC_HASH_SIZE is used */] - __attribute__((aligned(PAGE_SIZE), section(".bss.page_aligned"))); +int atomic_locks[PAGE_SIZE / sizeof(int)] __page_aligned_bss; #endif /* ATOMIC_LOCKS_FOUND_VIA_TABLE() */ static inline int *__atomic_hashed_lock(volatile void *v) { - /* NOTE: this code must match "sys_cmpxchg" in kernel/intvec.S */ + /* NOTE: this code must match "sys_cmpxchg" in kernel/intvec_32.S */ #if ATOMIC_LOCKS_FOUND_VIA_TABLE() unsigned long i = (unsigned long) v & ((PAGE_SIZE-1) & -sizeof(long long)); diff --git a/arch/tile/lib/atomic_asm_32.S b/arch/tile/lib/atomic_asm_32.S index 5a5514b77e78..82f64cc63658 100644 --- a/arch/tile/lib/atomic_asm_32.S +++ b/arch/tile/lib/atomic_asm_32.S @@ -14,7 +14,7 @@ * Support routines for atomic operations. Each function takes: * * r0: address to manipulate - * r1: pointer to atomic lock guarding this operation (for FUTEX_LOCK_REG) + * r1: pointer to atomic lock guarding this operation (for ATOMIC_LOCK_REG) * r2: new value to write, or for cmpxchg/add_unless, value to compare against * r3: (cmpxchg/xchg_add_unless) new value to write or add; * (atomic64 ops) high word of value to write diff --git a/arch/tile/lib/cacheflush.c b/arch/tile/lib/cacheflush.c index 11b6164c2097..35c1d8ca5f38 100644 --- a/arch/tile/lib/cacheflush.c +++ b/arch/tile/lib/cacheflush.c @@ -21,3 +21,105 @@ void __flush_icache_range(unsigned long start, unsigned long end) { invalidate_icache((const void *)start, end - start, PAGE_SIZE); } + + +/* Force a load instruction to issue. */ +static inline void force_load(char *p) +{ + *(volatile char *)p; +} + +/* + * Flush and invalidate a VA range that is homed remotely on a single + * core (if "!hfh") or homed via hash-for-home (if "hfh"), waiting + * until the memory controller holds the flushed values. + */ +void finv_buffer_remote(void *buffer, size_t size, int hfh) +{ + char *p, *base; + size_t step_size, load_count; + const unsigned long STRIPE_WIDTH = 8192; + + /* + * Flush and invalidate the buffer out of the local L1/L2 + * and request the home cache to flush and invalidate as well. + */ + __finv_buffer(buffer, size); + + /* + * Wait for the home cache to acknowledge that it has processed + * all the flush-and-invalidate requests. This does not mean + * that the flushed data has reached the memory controller yet, + * but it does mean the home cache is processing the flushes. + */ + __insn_mf(); + + /* + * Issue a load to the last cache line, which can't complete + * until all the previously-issued flushes to the same memory + * controller have also completed. If we weren't striping + * memory, that one load would be sufficient, but since we may + * be, we also need to back up to the last load issued to + * another memory controller, which would be the point where + * we crossed an 8KB boundary (the granularity of striping + * across memory controllers). Keep backing up and doing this + * until we are before the beginning of the buffer, or have + * hit all the controllers. + * + * If we are flushing a hash-for-home buffer, it's even worse. + * Each line may be homed on a different tile, and each tile + * may have up to four lines that are on different + * controllers. So as we walk backwards, we have to touch + * enough cache lines to satisfy these constraints. In + * practice this ends up being close enough to "load from + * every cache line on a full memory stripe on each + * controller" that we simply do that, to simplify the logic. + * + * FIXME: See bug 9535 for some issues with this code. + */ + if (hfh) { + step_size = L2_CACHE_BYTES; + load_count = (STRIPE_WIDTH / L2_CACHE_BYTES) * + (1 << CHIP_LOG_NUM_MSHIMS()); + } else { + step_size = STRIPE_WIDTH; + load_count = (1 << CHIP_LOG_NUM_MSHIMS()); + } + + /* Load the last byte of the buffer. */ + p = (char *)buffer + size - 1; + force_load(p); + + /* Bump down to the end of the previous stripe or cache line. */ + p -= step_size; + p = (char *)((unsigned long)p | (step_size - 1)); + + /* Figure out how far back we need to go. */ + base = p - (step_size * (load_count - 2)); + if ((long)base < (long)buffer) + base = buffer; + + /* + * Fire all the loads we need. The MAF only has eight entries + * so we can have at most eight outstanding loads, so we + * unroll by that amount. + */ +#pragma unroll 8 + for (; p >= base; p -= step_size) + force_load(p); + + /* + * Repeat, but with inv's instead of loads, to get rid of the + * data we just loaded into our own cache and the old home L3. + * No need to unroll since inv's don't target a register. + */ + p = (char *)buffer + size - 1; + __insn_inv(p); + p -= step_size; + p = (char *)((unsigned long)p | (step_size - 1)); + for (; p >= base; p -= step_size) + __insn_inv(p); + + /* Wait for the load+inv's (and thus finvs) to have completed. */ + __insn_mf(); +} diff --git a/arch/tile/lib/delay.c b/arch/tile/lib/delay.c index 5801b03c13ef..cdacdd11d360 100644 --- a/arch/tile/lib/delay.c +++ b/arch/tile/lib/delay.c @@ -15,20 +15,31 @@ #include <linux/module.h> #include <linux/delay.h> #include <linux/thread_info.h> -#include <asm/fixmap.h> -#include <hv/hypervisor.h> +#include <asm/timex.h> void __udelay(unsigned long usecs) { - hv_nanosleep(usecs * 1000); + if (usecs > ULONG_MAX / 1000) { + WARN_ON_ONCE(usecs > ULONG_MAX / 1000); + usecs = ULONG_MAX / 1000; + } + __ndelay(usecs * 1000); } EXPORT_SYMBOL(__udelay); void __ndelay(unsigned long nsecs) { - hv_nanosleep(nsecs); + cycles_t target = get_cycles(); + target += ns2cycles(nsecs); + while (get_cycles() < target) + cpu_relax(); } EXPORT_SYMBOL(__ndelay); -/* FIXME: should be declared in a header somewhere. */ +void __delay(unsigned long cycles) +{ + cycles_t target = get_cycles() + cycles; + while (get_cycles() < target) + cpu_relax(); +} EXPORT_SYMBOL(__delay); diff --git a/arch/tile/lib/exports.c b/arch/tile/lib/exports.c index 1509c5597653..49284fae9d09 100644 --- a/arch/tile/lib/exports.c +++ b/arch/tile/lib/exports.c @@ -29,6 +29,9 @@ EXPORT_SYMBOL(__put_user_8); EXPORT_SYMBOL(strnlen_user_asm); EXPORT_SYMBOL(strncpy_from_user_asm); EXPORT_SYMBOL(clear_user_asm); +EXPORT_SYMBOL(flush_user_asm); +EXPORT_SYMBOL(inv_user_asm); +EXPORT_SYMBOL(finv_user_asm); /* arch/tile/kernel/entry.S */ #include <linux/kernel.h> @@ -45,9 +48,6 @@ EXPORT_SYMBOL(__copy_from_user_zeroing); EXPORT_SYMBOL(__copy_in_user_inatomic); #endif -/* arch/tile/lib/mb_incoherent.S */ -EXPORT_SYMBOL(__mb_incoherent); - /* hypervisor glue */ #include <hv/hypervisor.h> EXPORT_SYMBOL(hv_dev_open); @@ -85,4 +85,8 @@ int64_t __muldi3(int64_t, int64_t); EXPORT_SYMBOL(__muldi3); uint64_t __lshrdi3(uint64_t, unsigned int); EXPORT_SYMBOL(__lshrdi3); +uint64_t __ashrdi3(uint64_t, unsigned int); +EXPORT_SYMBOL(__ashrdi3); +uint64_t __ashldi3(uint64_t, unsigned int); +EXPORT_SYMBOL(__ashldi3); #endif diff --git a/arch/tile/lib/mb_incoherent.S b/arch/tile/lib/mb_incoherent.S deleted file mode 100644 index 989ad7b68d5a..000000000000 --- a/arch/tile/lib/mb_incoherent.S +++ /dev/null @@ -1,34 +0,0 @@ -/* - * Copyright 2010 Tilera Corporation. All Rights Reserved. - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License - * as published by the Free Software Foundation, version 2. - * - * This program is distributed in the hope that it will be useful, but - * WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or - * NON INFRINGEMENT. See the GNU General Public License for - * more details. - * - * Assembly code for invoking the HV's fence_incoherent syscall. - */ - -#include <linux/linkage.h> -#include <hv/syscall_public.h> -#include <arch/abi.h> -#include <arch/chip.h> - -#if !CHIP_HAS_MF_WAITS_FOR_VICTIMS() - -/* - * Invoke the hypervisor's fence_incoherent syscall, which guarantees - * that all victims for cachelines homed on this tile have reached memory. - */ -STD_ENTRY(__mb_incoherent) - moveli TREG_SYSCALL_NR_NAME, HV_SYS_fence_incoherent - swint2 - jrp lr - STD_ENDPROC(__mb_incoherent) - -#endif diff --git a/arch/tile/lib/memcpy_tile64.c b/arch/tile/lib/memcpy_tile64.c index f7d4a6ad61e8..b2fe15e01075 100644 --- a/arch/tile/lib/memcpy_tile64.c +++ b/arch/tile/lib/memcpy_tile64.c @@ -96,7 +96,7 @@ static void memcpy_multicache(void *dest, const void *source, newsrc = __fix_to_virt(idx) + ((unsigned long)source & (PAGE_SIZE-1)); pmdp = pmd_offset(pud_offset(pgd_offset_k(newsrc), newsrc), newsrc); ptep = pte_offset_kernel(pmdp, newsrc); - *ptep = src_pte; /* set_pte() would be confused by this */ + __set_pte(ptep, src_pte); /* set_pte() would be confused by this */ local_flush_tlb_page(NULL, newsrc, PAGE_SIZE); /* Actually move the data. */ @@ -109,7 +109,7 @@ static void memcpy_multicache(void *dest, const void *source, */ src_pte = hv_pte_set_mode(src_pte, HV_PTE_MODE_CACHE_NO_L3); src_pte = hv_pte_set_writable(src_pte); /* need write access for inv */ - *ptep = src_pte; /* set_pte() would be confused by this */ + __set_pte(ptep, src_pte); /* set_pte() would be confused by this */ local_flush_tlb_page(NULL, newsrc, PAGE_SIZE); /* diff --git a/arch/tile/lib/spinlock_32.c b/arch/tile/lib/spinlock_32.c index 5cd1c4004eca..cb0999fb64b4 100644 --- a/arch/tile/lib/spinlock_32.c +++ b/arch/tile/lib/spinlock_32.c @@ -15,6 +15,7 @@ #include <linux/spinlock.h> #include <linux/module.h> #include <asm/processor.h> +#include <arch/spr_def.h> #include "spinlock_common.h" @@ -91,75 +92,75 @@ EXPORT_SYMBOL(arch_spin_unlock_wait); #define RD_COUNT_MASK ((1 << RD_COUNT_WIDTH) - 1) -/* Lock the word, spinning until there are no tns-ers. */ -static inline u32 get_rwlock(arch_rwlock_t *rwlock) -{ - u32 iterations = 0; - for (;;) { - u32 val = __insn_tns((int *)&rwlock->lock); - if (unlikely(val & 1)) { - delay_backoff(iterations++); - continue; - } - return val; - } -} - -int arch_read_trylock_slow(arch_rwlock_t *rwlock) -{ - u32 val = get_rwlock(rwlock); - int locked = (val << RD_COUNT_WIDTH) == 0; - rwlock->lock = val + (locked << RD_COUNT_SHIFT); - return locked; -} -EXPORT_SYMBOL(arch_read_trylock_slow); - -void arch_read_unlock_slow(arch_rwlock_t *rwlock) -{ - u32 val = get_rwlock(rwlock); - rwlock->lock = val - (1 << RD_COUNT_SHIFT); -} -EXPORT_SYMBOL(arch_read_unlock_slow); - -void arch_write_unlock_slow(arch_rwlock_t *rwlock, u32 val) +/* + * We can get the read lock if everything but the reader bits (which + * are in the high part of the word) is zero, i.e. no active or + * waiting writers, no tns. + * + * We guard the tns/store-back with an interrupt critical section to + * preserve the semantic that the same read lock can be acquired in an + * interrupt context. + */ +inline int arch_read_trylock(arch_rwlock_t *rwlock) { - u32 eq, mask = 1 << WR_CURR_SHIFT; - while (unlikely(val & 1)) { - /* Limited backoff since we are the highest-priority task. */ - relax(4); - val = __insn_tns((int *)&rwlock->lock); + u32 val; + __insn_mtspr(SPR_INTERRUPT_CRITICAL_SECTION, 1); + val = __insn_tns((int *)&rwlock->lock); + if (likely((val << _RD_COUNT_WIDTH) == 0)) { + val += 1 << RD_COUNT_SHIFT; + rwlock->lock = val; + __insn_mtspr(SPR_INTERRUPT_CRITICAL_SECTION, 0); + BUG_ON(val == 0); /* we don't expect wraparound */ + return 1; } - val = __insn_addb(val, mask); - eq = __insn_seqb(val, val << (WR_CURR_SHIFT - WR_NEXT_SHIFT)); - val = __insn_mz(eq & mask, val); - rwlock->lock = val; + if ((val & 1) == 0) + rwlock->lock = val; + __insn_mtspr(SPR_INTERRUPT_CRITICAL_SECTION, 0); + return 0; } -EXPORT_SYMBOL(arch_write_unlock_slow); +EXPORT_SYMBOL(arch_read_trylock); /* - * We spin until everything but the reader bits (which are in the high - * part of the word) are zero, i.e. no active or waiting writers, no tns. - * + * Spin doing arch_read_trylock() until we acquire the lock. * ISSUE: This approach can permanently starve readers. A reader who sees * a writer could instead take a ticket lock (just like a writer would), * and atomically enter read mode (with 1 reader) when it gets the ticket. - * This way both readers and writers will always make forward progress + * This way both readers and writers would always make forward progress * in a finite time. */ -void arch_read_lock_slow(arch_rwlock_t *rwlock, u32 val) +void arch_read_lock(arch_rwlock_t *rwlock) { u32 iterations = 0; - do { - if (!(val & 1)) - rwlock->lock = val; + while (unlikely(!arch_read_trylock(rwlock))) delay_backoff(iterations++); +} +EXPORT_SYMBOL(arch_read_lock); + +void arch_read_unlock(arch_rwlock_t *rwlock) +{ + u32 val, iterations = 0; + + mb(); /* guarantee anything modified under the lock is visible */ + for (;;) { + __insn_mtspr(SPR_INTERRUPT_CRITICAL_SECTION, 1); val = __insn_tns((int *)&rwlock->lock); - } while ((val << RD_COUNT_WIDTH) != 0); - rwlock->lock = val + (1 << RD_COUNT_SHIFT); + if (likely(val & 1) == 0) { + rwlock->lock = val - (1 << _RD_COUNT_SHIFT); + __insn_mtspr(SPR_INTERRUPT_CRITICAL_SECTION, 0); + break; + } + __insn_mtspr(SPR_INTERRUPT_CRITICAL_SECTION, 0); + delay_backoff(iterations++); + } } -EXPORT_SYMBOL(arch_read_lock_slow); +EXPORT_SYMBOL(arch_read_unlock); -void arch_write_lock_slow(arch_rwlock_t *rwlock, u32 val) +/* + * We don't need an interrupt critical section here (unlike for + * arch_read_lock) since we should never use a bare write lock where + * it could be interrupted by code that could try to re-acquire it. + */ +void arch_write_lock(arch_rwlock_t *rwlock) { /* * The trailing underscore on this variable (and curr_ below) @@ -168,6 +169,12 @@ void arch_write_lock_slow(arch_rwlock_t *rwlock, u32 val) */ u32 my_ticket_; u32 iterations = 0; + u32 val = __insn_tns((int *)&rwlock->lock); + + if (likely(val == 0)) { + rwlock->lock = 1 << _WR_NEXT_SHIFT; + return; + } /* * Wait until there are no readers, then bump up the next @@ -206,23 +213,47 @@ void arch_write_lock_slow(arch_rwlock_t *rwlock, u32 val) relax(4); } } -EXPORT_SYMBOL(arch_write_lock_slow); +EXPORT_SYMBOL(arch_write_lock); -int __tns_atomic_acquire(atomic_t *lock) +int arch_write_trylock(arch_rwlock_t *rwlock) { - int ret; - u32 iterations = 0; + u32 val = __insn_tns((int *)&rwlock->lock); - BUG_ON(__insn_mfspr(SPR_INTERRUPT_CRITICAL_SECTION)); - __insn_mtspr(SPR_INTERRUPT_CRITICAL_SECTION, 1); + /* + * If a tns is in progress, or there's a waiting or active locker, + * or active readers, we can't take the lock, so give up. + */ + if (unlikely(val != 0)) { + if (!(val & 1)) + rwlock->lock = val; + return 0; + } - while ((ret = __insn_tns((void *)&lock->counter)) == 1) - delay_backoff(iterations++); - return ret; + /* Set the "next" field to mark it locked. */ + rwlock->lock = 1 << _WR_NEXT_SHIFT; + return 1; } +EXPORT_SYMBOL(arch_write_trylock); -void __tns_atomic_release(atomic_t *p, int v) +void arch_write_unlock(arch_rwlock_t *rwlock) { - p->counter = v; - __insn_mtspr(SPR_INTERRUPT_CRITICAL_SECTION, 0); + u32 val, eq, mask; + + mb(); /* guarantee anything modified under the lock is visible */ + val = __insn_tns((int *)&rwlock->lock); + if (likely(val == (1 << _WR_NEXT_SHIFT))) { + rwlock->lock = 0; + return; + } + while (unlikely(val & 1)) { + /* Limited backoff since we are the highest-priority task. */ + relax(4); + val = __insn_tns((int *)&rwlock->lock); + } + mask = 1 << WR_CURR_SHIFT; + val = __insn_addb(val, mask); + eq = __insn_seqb(val, val << (WR_CURR_SHIFT - WR_NEXT_SHIFT)); + val = __insn_mz(eq & mask, val); + rwlock->lock = val; } +EXPORT_SYMBOL(arch_write_unlock); diff --git a/arch/tile/mm/fault.c b/arch/tile/mm/fault.c index dcebfc831cd6..758f597f488c 100644 --- a/arch/tile/mm/fault.c +++ b/arch/tile/mm/fault.c @@ -655,14 +655,6 @@ struct intvec_state do_page_fault_ics(struct pt_regs *regs, int fault_num, } /* - * NOTE: the one other type of access that might bring us here - * are the memory ops in __tns_atomic_acquire/__tns_atomic_release, - * but we don't have to check specially for them since we can - * always safely return to the address of the fault and retry, - * since no separate atomic locks are involved. - */ - - /* * Now that we have released the atomic lock (if necessary), * it's safe to spin if the PTE that caused the fault was migrating. */ diff --git a/arch/tile/mm/homecache.c b/arch/tile/mm/homecache.c index d78df3a6ee15..cbe6f4f9eca3 100644 --- a/arch/tile/mm/homecache.c +++ b/arch/tile/mm/homecache.c @@ -179,23 +179,46 @@ void flush_remote(unsigned long cache_pfn, unsigned long cache_control, panic("Unsafe to continue."); } +void flush_remote_page(struct page *page, int order) +{ + int i, pages = (1 << order); + for (i = 0; i < pages; ++i, ++page) { + void *p = kmap_atomic(page); + int hfh = 0; + int home = page_home(page); +#if CHIP_HAS_CBOX_HOME_MAP() + if (home == PAGE_HOME_HASH) + hfh = 1; + else +#endif + BUG_ON(home < 0 || home >= NR_CPUS); + finv_buffer_remote(p, PAGE_SIZE, hfh); + kunmap_atomic(p); + } +} + void homecache_evict(const struct cpumask *mask) { flush_remote(0, HV_FLUSH_EVICT_L2, mask, 0, 0, 0, NULL, NULL, 0); } -/* Return a mask of the cpus whose caches currently own these pages. */ -static void homecache_mask(struct page *page, int pages, - struct cpumask *home_mask) +/* + * Return a mask of the cpus whose caches currently own these pages. + * The return value is whether the pages are all coherently cached + * (i.e. none are immutable, incoherent, or uncached). + */ +static int homecache_mask(struct page *page, int pages, + struct cpumask *home_mask) { int i; + int cached_coherently = 1; cpumask_clear(home_mask); for (i = 0; i < pages; ++i) { int home = page_home(&page[i]); if (home == PAGE_HOME_IMMUTABLE || home == PAGE_HOME_INCOHERENT) { cpumask_copy(home_mask, cpu_possible_mask); - return; + return 0; } #if CHIP_HAS_CBOX_HOME_MAP() if (home == PAGE_HOME_HASH) { @@ -203,11 +226,14 @@ static void homecache_mask(struct page *page, int pages, continue; } #endif - if (home == PAGE_HOME_UNCACHED) + if (home == PAGE_HOME_UNCACHED) { + cached_coherently = 0; continue; + } BUG_ON(home < 0 || home >= NR_CPUS); cpumask_set_cpu(home, home_mask); } + return cached_coherently; } /* @@ -386,7 +412,7 @@ void homecache_change_page_home(struct page *page, int order, int home) pte_t *ptep = virt_to_pte(NULL, kva); pte_t pteval = *ptep; BUG_ON(!pte_present(pteval) || pte_huge(pteval)); - *ptep = pte_set_home(pteval, home); + __set_pte(ptep, pte_set_home(pteval, home)); } } diff --git a/arch/tile/mm/init.c b/arch/tile/mm/init.c index 0b9ce69b0ee5..d6e87fda2fb2 100644 --- a/arch/tile/mm/init.c +++ b/arch/tile/mm/init.c @@ -53,22 +53,11 @@ #include "migrate.h" -/* - * We could set FORCE_MAX_ZONEORDER to "(HPAGE_SHIFT - PAGE_SHIFT + 1)" - * in the Tile Kconfig, but this generates configure warnings. - * Do it here and force people to get it right to compile this file. - * The problem is that with 4KB small pages and 16MB huge pages, - * the default value doesn't allow us to group enough small pages - * together to make up a huge page. - */ -#if CONFIG_FORCE_MAX_ZONEORDER < HPAGE_SHIFT - PAGE_SHIFT + 1 -# error "Change FORCE_MAX_ZONEORDER in arch/tile/Kconfig to match page size" -#endif - #define clear_pgd(pmdptr) (*(pmdptr) = hv_pte(0)) #ifndef __tilegx__ unsigned long VMALLOC_RESERVE = CONFIG_VMALLOC_RESERVE; +EXPORT_SYMBOL(VMALLOC_RESERVE); #endif DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); @@ -445,7 +434,7 @@ static pmd_t *__init get_pmd(pgd_t pgtables[], unsigned long va) /* Temporary page table we use for staging. */ static pgd_t pgtables[PTRS_PER_PGD] - __attribute__((section(".init.page"))); + __attribute__((aligned(HV_PAGE_TABLE_ALIGN))); /* * This maps the physical memory to kernel virtual address space, a total @@ -653,6 +642,17 @@ static void __init kernel_physical_mapping_init(pgd_t *pgd_base) memcpy(pgd_base, pgtables, sizeof(pgtables)); __install_page_table(pgd_base, __get_cpu_var(current_asid), swapper_pgprot); + + /* + * We just read swapper_pgprot and thus brought it into the cache, + * with its new home & caching mode. When we start the other CPUs, + * they're going to reference swapper_pgprot via their initial fake + * VA-is-PA mappings, which cache everything locally. At that + * time, if it's in our cache with a conflicting home, the + * simulator's coherence checker will complain. So, flush it out + * of our cache; we're not going to ever use it again anyway. + */ + __insn_finv(&swapper_pgprot); } /* @@ -950,11 +950,7 @@ struct kmem_cache *pgd_cache; void __init pgtable_cache_init(void) { - pgd_cache = kmem_cache_create("pgd", - PTRS_PER_PGD*sizeof(pgd_t), - PTRS_PER_PGD*sizeof(pgd_t), - 0, - NULL); + pgd_cache = kmem_cache_create("pgd", SIZEOF_PGD, SIZEOF_PGD, 0, NULL); if (!pgd_cache) panic("pgtable_cache_init(): Cannot create pgd cache"); } @@ -989,7 +985,7 @@ static long __write_once initfree = 1; static int __init set_initfree(char *str) { long val; - if (strict_strtol(str, 0, &val)) { + if (strict_strtol(str, 0, &val) == 0) { initfree = val; pr_info("initfree: %s free init pages\n", initfree ? "will" : "won't"); diff --git a/arch/tile/mm/migrate_32.S b/arch/tile/mm/migrate_32.S index f738765cd1e6..ac01a7cdf77f 100644 --- a/arch/tile/mm/migrate_32.S +++ b/arch/tile/mm/migrate_32.S @@ -18,6 +18,7 @@ #include <linux/linkage.h> #include <linux/threads.h> #include <asm/page.h> +#include <asm/thread_info.h> #include <asm/types.h> #include <asm/asm-offsets.h> #include <hv/hypervisor.h> diff --git a/arch/tile/mm/pgtable.c b/arch/tile/mm/pgtable.c index 1f5430c53d0d..1a2b36f8866d 100644 --- a/arch/tile/mm/pgtable.c +++ b/arch/tile/mm/pgtable.c @@ -142,6 +142,76 @@ pte_t *_pte_offset_map(pmd_t *dir, unsigned long address) } #endif +/** + * shatter_huge_page() - ensure a given address is mapped by a small page. + * + * This function converts a huge PTE mapping kernel LOWMEM into a bunch + * of small PTEs with the same caching. No cache flush required, but we + * must do a global TLB flush. + * + * Any caller that wishes to modify a kernel mapping that might + * have been made with a huge page should call this function, + * since doing so properly avoids race conditions with installing the + * newly-shattered page and then flushing all the TLB entries. + * + * @addr: Address at which to shatter any existing huge page. + */ +void shatter_huge_page(unsigned long addr) +{ + pgd_t *pgd; + pud_t *pud; + pmd_t *pmd; + unsigned long flags = 0; /* happy compiler */ +#ifdef __PAGETABLE_PMD_FOLDED + struct list_head *pos; +#endif + + /* Get a pointer to the pmd entry that we need to change. */ + addr &= HPAGE_MASK; + BUG_ON(pgd_addr_invalid(addr)); + BUG_ON(addr < PAGE_OFFSET); /* only for kernel LOWMEM */ + pgd = swapper_pg_dir + pgd_index(addr); + pud = pud_offset(pgd, addr); + BUG_ON(!pud_present(*pud)); + pmd = pmd_offset(pud, addr); + BUG_ON(!pmd_present(*pmd)); + if (!pmd_huge_page(*pmd)) + return; + + /* + * Grab the pgd_lock, since we may need it to walk the pgd_list, + * and since we need some kind of lock here to avoid races. + */ + spin_lock_irqsave(&pgd_lock, flags); + if (!pmd_huge_page(*pmd)) { + /* Lost the race to convert the huge page. */ + spin_unlock_irqrestore(&pgd_lock, flags); + return; + } + + /* Shatter the huge page into the preallocated L2 page table. */ + pmd_populate_kernel(&init_mm, pmd, + get_prealloc_pte(pte_pfn(*(pte_t *)pmd))); + +#ifdef __PAGETABLE_PMD_FOLDED + /* Walk every pgd on the system and update the pmd there. */ + list_for_each(pos, &pgd_list) { + pmd_t *copy_pmd; + pgd = list_to_pgd(pos) + pgd_index(addr); + pud = pud_offset(pgd, addr); + copy_pmd = pmd_offset(pud, addr); + __set_pmd(copy_pmd, *pmd); + } +#endif + + /* Tell every cpu to notice the change. */ + flush_remote(0, 0, NULL, addr, HPAGE_SIZE, HPAGE_SIZE, + cpu_possible_mask, NULL, 0); + + /* Hold the lock until the TLB flush is finished to avoid races. */ + spin_unlock_irqrestore(&pgd_lock, flags); +} + /* * List of all pgd's needed so it can invalidate entries in both cached * and uncached pgd's. This is essentially codepath-based locking @@ -184,9 +254,9 @@ static void pgd_ctor(pgd_t *pgd) BUG_ON(((u64 *)swapper_pg_dir)[pgd_index(MEM_USER_INTRPT)] != 0); #endif - clone_pgd_range(pgd + KERNEL_PGD_INDEX_START, - swapper_pg_dir + KERNEL_PGD_INDEX_START, - KERNEL_PGD_PTRS); + memcpy(pgd + KERNEL_PGD_INDEX_START, + swapper_pg_dir + KERNEL_PGD_INDEX_START, + KERNEL_PGD_PTRS * sizeof(pgd_t)); pgd_list_add(pgd); spin_unlock_irqrestore(&pgd_lock, flags); @@ -220,8 +290,11 @@ void pgd_free(struct mm_struct *mm, pgd_t *pgd) struct page *pte_alloc_one(struct mm_struct *mm, unsigned long address) { - gfp_t flags = GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO|__GFP_COMP; + gfp_t flags = GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO; struct page *p; +#if L2_USER_PGTABLE_ORDER > 0 + int i; +#endif #ifdef CONFIG_HIGHPTE flags |= __GFP_HIGHMEM; @@ -231,6 +304,18 @@ struct page *pte_alloc_one(struct mm_struct *mm, unsigned long address) if (p == NULL) return NULL; +#if L2_USER_PGTABLE_ORDER > 0 + /* + * Make every page have a page_count() of one, not just the first. + * We don't use __GFP_COMP since it doesn't look like it works + * correctly with tlb_remove_page(). + */ + for (i = 1; i < L2_USER_PGTABLE_PAGES; ++i) { + init_page_count(p+i); + inc_zone_page_state(p+i, NR_PAGETABLE); + } +#endif + pgtable_page_ctor(p); return p; } @@ -242,8 +327,15 @@ struct page *pte_alloc_one(struct mm_struct *mm, unsigned long address) */ void pte_free(struct mm_struct *mm, struct page *p) { + int i; + pgtable_page_dtor(p); - __free_pages(p, L2_USER_PGTABLE_ORDER); + __free_page(p); + + for (i = 1; i < L2_USER_PGTABLE_PAGES; ++i) { + __free_page(p+i); + dec_zone_page_state(p+i, NR_PAGETABLE); + } } void __pte_free_tlb(struct mmu_gather *tlb, struct page *pte, @@ -252,18 +344,11 @@ void __pte_free_tlb(struct mmu_gather *tlb, struct page *pte, int i; pgtable_page_dtor(pte); - tlb->need_flush = 1; - if (tlb_fast_mode(tlb)) { - struct page *pte_pages[L2_USER_PGTABLE_PAGES]; - for (i = 0; i < L2_USER_PGTABLE_PAGES; ++i) - pte_pages[i] = pte + i; - free_pages_and_swap_cache(pte_pages, L2_USER_PGTABLE_PAGES); - return; - } - for (i = 0; i < L2_USER_PGTABLE_PAGES; ++i) { - tlb->pages[tlb->nr++] = pte + i; - if (tlb->nr >= FREE_PTE_NR) - tlb_flush_mmu(tlb, 0, 0); + tlb_remove_page(tlb, pte); + + for (i = 1; i < L2_USER_PGTABLE_PAGES; ++i) { + tlb_remove_page(tlb, pte + i); + dec_zone_page_state(pte + i, NR_PAGETABLE); } } @@ -346,35 +431,51 @@ int get_remote_cache_cpu(pgprot_t prot) return x + y * smp_width; } -void set_pte_order(pte_t *ptep, pte_t pte, int order) +/* + * Convert a kernel VA to a PA and homing information. + */ +int va_to_cpa_and_pte(void *va, unsigned long long *cpa, pte_t *pte) { - unsigned long pfn = pte_pfn(pte); - struct page *page = pfn_to_page(pfn); + struct page *page = virt_to_page(va); + pte_t null_pte = { 0 }; - /* Update the home of a PTE if necessary */ - pte = pte_set_home(pte, page_home(page)); + *cpa = __pa(va); + /* Note that this is not writing a page table, just returning a pte. */ + *pte = pte_set_home(null_pte, page_home(page)); + + return 0; /* return non-zero if not hfh? */ +} +EXPORT_SYMBOL(va_to_cpa_and_pte); + +void __set_pte(pte_t *ptep, pte_t pte) +{ #ifdef __tilegx__ *ptep = pte; #else - /* - * When setting a PTE, write the high bits first, then write - * the low bits. This sets the "present" bit only after the - * other bits are in place. If a particular PTE update - * involves transitioning from one valid PTE to another, it - * may be necessary to call set_pte_order() more than once, - * transitioning via a suitable intermediate state. - * Note that this sequence also means that if we are transitioning - * from any migrating PTE to a non-migrating one, we will not - * see a half-updated PTE with the migrating bit off. - */ -#if HV_PTE_INDEX_PRESENT >= 32 || HV_PTE_INDEX_MIGRATING >= 32 -# error Must write the present and migrating bits last -#endif - ((u32 *)ptep)[1] = (u32)(pte_val(pte) >> 32); - barrier(); - ((u32 *)ptep)[0] = (u32)(pte_val(pte)); -#endif +# if HV_PTE_INDEX_PRESENT >= 32 || HV_PTE_INDEX_MIGRATING >= 32 +# error Must write the present and migrating bits last +# endif + if (pte_present(pte)) { + ((u32 *)ptep)[1] = (u32)(pte_val(pte) >> 32); + barrier(); + ((u32 *)ptep)[0] = (u32)(pte_val(pte)); + } else { + ((u32 *)ptep)[0] = (u32)(pte_val(pte)); + barrier(); + ((u32 *)ptep)[1] = (u32)(pte_val(pte) >> 32); + } +#endif /* __tilegx__ */ +} + +void set_pte(pte_t *ptep, pte_t pte) +{ + struct page *page = pfn_to_page(pte_pfn(pte)); + + /* Update the home of a PTE if necessary */ + pte = pte_set_home(pte, page_home(page)); + + __set_pte(ptep, pte); } /* Can this mm load a PTE with cached_priority set? */ |