diff options
| -rw-r--r-- | Documentation/arm/memory.txt | 9 | ||||
| -rw-r--r-- | arch/arm/Kconfig | 17 | ||||
| -rw-r--r-- | arch/arm/common/dmabounce.c | 7 | ||||
| -rw-r--r-- | arch/arm/include/asm/dma-mapping.h | 14 | ||||
| -rw-r--r-- | arch/arm/include/asm/fixmap.h | 41 | ||||
| -rw-r--r-- | arch/arm/include/asm/highmem.h | 31 | ||||
| -rw-r--r-- | arch/arm/include/asm/kmap_types.h | 1 | ||||
| -rw-r--r-- | arch/arm/include/asm/memory.h | 14 | ||||
| -rw-r--r-- | arch/arm/mach-iop13xx/include/mach/memory.h | 5 | ||||
| -rw-r--r-- | arch/arm/mach-ks8695/include/mach/memory.h | 6 | ||||
| -rw-r--r-- | arch/arm/mm/Makefile | 1 | ||||
| -rw-r--r-- | arch/arm/mm/cache-feroceon-l2.c | 54 | ||||
| -rw-r--r-- | arch/arm/mm/cache-xsc3l2.c | 107 | ||||
| -rw-r--r-- | arch/arm/mm/dma-mapping.c | 92 | ||||
| -rw-r--r-- | arch/arm/mm/flush.c | 2 | ||||
| -rw-r--r-- | arch/arm/mm/highmem.c | 116 | ||||
| -rw-r--r-- | arch/arm/mm/init.c | 23 | ||||
| -rw-r--r-- | arch/arm/mm/mm.h | 3 | ||||
| -rw-r--r-- | arch/arm/mm/mmap.c | 2 | ||||
| -rw-r--r-- | arch/arm/mm/mmu.c | 18 | ||||
| -rw-r--r-- | arch/arm/plat-omap/include/mach/memory.h | 8 | ||||
| -rw-r--r-- | mm/highmem.c | 65 |
22 files changed, 557 insertions, 79 deletions
diff --git a/Documentation/arm/memory.txt b/Documentation/arm/memory.txt index dc60455..43cb100 100644 --- a/Documentation/arm/memory.txt +++ b/Documentation/arm/memory.txt @@ -29,7 +29,14 @@ ffff0000 ffff0fff CPU vector page. CPU supports vector relocation (control register V bit.) -ffc00000 fffeffff DMA memory mapping region. Memory returned +fffe0000 fffeffff XScale cache flush area. This is used + in proc-xscale.S to flush the whole data + cache. Free for other usage on non-XScale. + +fff00000 fffdffff Fixmap mapping region. Addresses provided + by fix_to_virt() will be located here. + +ffc00000 ffefffff DMA memory mapping region. Memory returned by the dma_alloc_xxx functions will be dynamically mapped here. diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index cb4486a..e62b37a 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -939,6 +939,23 @@ config NODES_SHIFT default "2" depends on NEED_MULTIPLE_NODES +config HIGHMEM + bool "High Memory Support (EXPERIMENTAL)" + depends on MMU && EXPERIMENTAL + help + The address space of ARM processors is only 4 Gigabytes large + and it has to accommodate user address space, kernel address + space as well as some memory mapped IO. That means that, if you + have a large amount of physical memory and/or IO, not all of the + memory can be "permanently mapped" by the kernel. The physical + memory that is not permanently mapped is called "high memory". + + Depending on the selected kernel/user memory split, minimum + vmalloc space and actual amount of RAM, you may not need this + option which should result in a slightly faster kernel. + + If unsure, say n. + source "mm/Kconfig" config LEDS diff --git a/arch/arm/common/dmabounce.c b/arch/arm/common/dmabounce.c index f030f07..734ac91 100644 --- a/arch/arm/common/dmabounce.c +++ b/arch/arm/common/dmabounce.c @@ -25,6 +25,7 @@ #include <linux/module.h> #include <linux/init.h> #include <linux/slab.h> +#include <linux/page-flags.h> #include <linux/device.h> #include <linux/dma-mapping.h> #include <linux/dmapool.h> @@ -349,6 +350,12 @@ dma_addr_t dma_map_page(struct device *dev, struct page *page, BUG_ON(!valid_dma_direction(dir)); + if (PageHighMem(page)) { + dev_err(dev, "DMA buffer bouncing of HIGHMEM pages " + "is not supported\n"); + return ~0; + } + return map_single(dev, page_address(page) + offset, size, dir); } EXPORT_SYMBOL(dma_map_page); diff --git a/arch/arm/include/asm/dma-mapping.h b/arch/arm/include/asm/dma-mapping.h index 22cb14e..ff46dfa 100644 --- a/arch/arm/include/asm/dma-mapping.h +++ b/arch/arm/include/asm/dma-mapping.h @@ -15,10 +15,20 @@ * must not be used by drivers. */ #ifndef __arch_page_to_dma + +#if !defined(CONFIG_HIGHMEM) static inline dma_addr_t page_to_dma(struct device *dev, struct page *page) { return (dma_addr_t)__virt_to_bus((unsigned long)page_address(page)); } +#elif defined(__pfn_to_bus) +static inline dma_addr_t page_to_dma(struct device *dev, struct page *page) +{ + return (dma_addr_t)__pfn_to_bus(page_to_pfn(page)); +} +#else +#error "this machine class needs to define __arch_page_to_dma to use HIGHMEM" +#endif static inline void *dma_to_virt(struct device *dev, dma_addr_t addr) { @@ -57,6 +67,8 @@ static inline dma_addr_t virt_to_dma(struct device *dev, void *addr) * Use the driver DMA support - see dma-mapping.h (dma_sync_*) */ extern void dma_cache_maint(const void *kaddr, size_t size, int rw); +extern void dma_cache_maint_page(struct page *page, unsigned long offset, + size_t size, int rw); /* * Return whether the given device DMA address mask can be supported @@ -316,7 +328,7 @@ static inline dma_addr_t dma_map_page(struct device *dev, struct page *page, BUG_ON(!valid_dma_direction(dir)); if (!arch_is_coherent()) - dma_cache_maint(page_address(page) + offset, size, dir); + dma_cache_maint_page(page, offset, size, dir); return page_to_dma(dev, page) + offset; } diff --git a/arch/arm/include/asm/fixmap.h b/arch/arm/include/asm/fixmap.h new file mode 100644 index 0000000..bbae919 --- /dev/null +++ b/arch/arm/include/asm/fixmap.h @@ -0,0 +1,41 @@ +#ifndef _ASM_FIXMAP_H +#define _ASM_FIXMAP_H + +/* + * Nothing too fancy for now. + * + * On ARM we already have well known fixed virtual addresses imposed by + * the architecture such as the vector page which is located at 0xffff0000, + * therefore a second level page table is already allocated covering + * 0xfff00000 upwards. + * + * The cache flushing code in proc-xscale.S uses the virtual area between + * 0xfffe0000 and 0xfffeffff. + */ + +#define FIXADDR_START 0xfff00000UL +#define FIXADDR_TOP 0xfffe0000UL +#define FIXADDR_SIZE (FIXADDR_TOP - FIXADDR_START) + +#define FIX_KMAP_BEGIN 0 +#define FIX_KMAP_END (FIXADDR_SIZE >> PAGE_SHIFT) + +#define __fix_to_virt(x) (FIXADDR_START + ((x) << PAGE_SHIFT)) +#define __virt_to_fix(x) (((x) - FIXADDR_START) >> PAGE_SHIFT) + +extern void __this_fixmap_does_not_exist(void); + +static inline unsigned long fix_to_virt(const unsigned int idx) +{ + if (idx >= FIX_KMAP_END) + __this_fixmap_does_not_exist(); + return __fix_to_virt(idx); +} + +static inline unsigned int virt_to_fix(const unsigned long vaddr) +{ + BUG_ON(vaddr >= FIXADDR_TOP || vaddr < FIXADDR_START); + return __virt_to_fix(vaddr); +} + +#endif diff --git a/arch/arm/include/asm/highmem.h b/arch/arm/include/asm/highmem.h new file mode 100644 index 0000000..7f36d00 --- /dev/null +++ b/arch/arm/include/asm/highmem.h @@ -0,0 +1,31 @@ +#ifndef _ASM_HIGHMEM_H +#define _ASM_HIGHMEM_H + +#include <asm/kmap_types.h> + +#define PKMAP_BASE (PAGE_OFFSET - PMD_SIZE) +#define LAST_PKMAP PTRS_PER_PTE +#define LAST_PKMAP_MASK (LAST_PKMAP - 1) +#define PKMAP_NR(virt) (((virt) - PKMAP_BASE) >> PAGE_SHIFT) +#define PKMAP_ADDR(nr) (PKMAP_BASE + ((nr) << PAGE_SHIFT)) + +#define kmap_prot PAGE_KERNEL + +#define flush_cache_kmaps() flush_cache_all() + +extern pte_t *pkmap_page_table; + +#define ARCH_NEEDS_KMAP_HIGH_GET + +extern void *kmap_high(struct page *page); +extern void *kmap_high_get(struct page *page); +extern void kunmap_high(struct page *page); + +extern void *kmap(struct page *page); +extern void kunmap(struct page *page); +extern void *kmap_atomic(struct page *page, enum km_type type); +extern void kunmap_atomic(void *kvaddr, enum km_type type); +extern void *kmap_atomic_pfn(unsigned long pfn, enum km_type type); +extern struct page *kmap_atomic_to_page(const void *ptr); + +#endif diff --git a/arch/arm/include/asm/kmap_types.h b/arch/arm/include/asm/kmap_types.h index 45def13..d16ec97 100644 --- a/arch/arm/include/asm/kmap_types.h +++ b/arch/arm/include/asm/kmap_types.h @@ -18,6 +18,7 @@ enum km_type { KM_IRQ1, KM_SOFTIRQ0, KM_SOFTIRQ1, + KM_L2_CACHE, KM_TYPE_NR }; diff --git a/arch/arm/include/asm/memory.h b/arch/arm/include/asm/memory.h index 0202a7c..85763db 100644 --- a/arch/arm/include/asm/memory.h +++ b/arch/arm/include/asm/memory.h @@ -44,14 +44,21 @@ * The module space lives between the addresses given by TASK_SIZE * and PAGE_OFFSET - it must be within 32MB of the kernel text. */ -#define MODULES_END (PAGE_OFFSET) -#define MODULES_VADDR (MODULES_END - 16*1048576) - +#define MODULES_VADDR (PAGE_OFFSET - 16*1024*1024) #if TASK_SIZE > MODULES_VADDR #error Top of user space clashes with start of module space #endif /* + * The highmem pkmap virtual space shares the end of the module area. + */ +#ifdef CONFIG_HIGHMEM +#define MODULES_END (PAGE_OFFSET - PMD_SIZE) +#else +#define MODULES_END (PAGE_OFFSET) +#endif + +/* * The XIP kernel gets mapped at the bottom of the module vm area. * Since we use sections to map it, this macro replaces the physical address * with its virtual address while keeping offset from the base section. @@ -181,6 +188,7 @@ static inline void *phys_to_virt(unsigned long x) #ifndef __virt_to_bus #define __virt_to_bus __virt_to_phys #define __bus_to_virt __phys_to_virt +#define __pfn_to_bus(x) ((x) << PAGE_SHIFT) #endif static inline __deprecated unsigned long virt_to_bus(void *x) diff --git a/arch/arm/mach-iop13xx/include/mach/memory.h b/arch/arm/mach-iop13xx/include/mach/memory.h index e012bf1..42ae29b 100644 --- a/arch/arm/mach-iop13xx/include/mach/memory.h +++ b/arch/arm/mach-iop13xx/include/mach/memory.h @@ -59,7 +59,10 @@ static inline unsigned long __lbus_to_virt(dma_addr_t x) }) #define __arch_page_to_dma(dev, page) \ - __arch_virt_to_dma(dev, page_address(page)) + ({ \ + /* __is_lbus_virt() can never be true for RAM pages */ \ + (dma_addr_t)page_to_phys(page); \ + }) #endif /* CONFIG_ARCH_IOP13XX */ #endif /* !ASSEMBLY */ diff --git a/arch/arm/mach-ks8695/include/mach/memory.h b/arch/arm/mach-ks8695/include/mach/memory.h index 6d5887c..76e5308 100644 --- a/arch/arm/mach-ks8695/include/mach/memory.h +++ b/arch/arm/mach-ks8695/include/mach/memory.h @@ -35,7 +35,11 @@ extern struct bus_type platform_bus_type; __phys_to_virt(x) : __bus_to_virt(x)); }) #define __arch_virt_to_dma(dev, x) ({ is_lbus_device(dev) ? \ (dma_addr_t)__virt_to_phys(x) : (dma_addr_t)__virt_to_bus(x); }) -#define __arch_page_to_dma(dev, x) __arch_virt_to_dma(dev, page_address(x)) +#define __arch_page_to_dma(dev, x) \ + ({ dma_addr_t __dma = page_to_phys(page); \ + if (!is_lbus_device(dev)) \ + __dma = __dma - PHYS_OFFSET + KS8695_PCIMEM_PA; \ + __dma; }) #endif diff --git a/arch/arm/mm/Makefile b/arch/arm/mm/Makefile index 64149d9..c264683 100644 --- a/arch/arm/mm/Makefile +++ b/arch/arm/mm/Makefile @@ -16,6 +16,7 @@ obj-$(CONFIG_MODULES) += proc-syms.o obj-$(CONFIG_ALIGNMENT_TRAP) += alignment.o obj-$(CONFIG_DISCONTIGMEM) += discontig.o +obj-$(CONFIG_HIGHMEM) += highmem.o obj-$(CONFIG_CPU_ABRT_NOMMU) += abort-nommu.o obj-$(CONFIG_CPU_ABRT_EV4) += abort-ev4.o diff --git a/arch/arm/mm/cache-feroceon-l2.c b/arch/arm/mm/cache-feroceon-l2.c index 80cd207..d6dd838 100644 --- a/arch/arm/mm/cache-feroceon-l2.c +++ b/arch/arm/mm/cache-feroceon-l2.c @@ -14,8 +14,12 @@ #include <linux/init.h> #include <asm/cacheflush.h> +#include <asm/kmap_types.h> +#include <asm/fixmap.h> +#include <asm/pgtable.h> +#include <asm/tlbflush.h> #include <plat/cache-feroceon-l2.h> - +#include "mm.h" /* * Low-level cache maintenance operations. @@ -34,14 +38,36 @@ * The range operations require two successive cp15 writes, in * between which we don't want to be preempted. */ + +static inline unsigned long l2_start_va(unsigned long paddr) +{ +#ifdef CONFIG_HIGHMEM + /* + * Let's do our own fixmap stuff in a minimal way here. + * Because range ops can't be done on physical addresses, + * we simply install a virtual mapping for it only for the + * TLB lookup to occur, hence no need to flush the untouched + * memory mapping. This is protected with the disabling of + * interrupts by the caller. + */ + unsigned long idx = KM_L2_CACHE + KM_TYPE_NR * smp_processor_id(); + unsigned long vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx); + set_pte_ext(TOP_PTE(vaddr), pfn_pte(paddr >> PAGE_SHIFT, PAGE_KERNEL), 0); + local_flush_tlb_kernel_page(vaddr); + return vaddr + (paddr & ~PAGE_MASK); +#else + return __phys_to_virt(paddr); +#endif +} + static inline void l2_clean_pa(unsigned long addr) { __asm__("mcr p15, 1, %0, c15, c9, 3" : : "r" (addr)); } -static inline void l2_clean_mva_range(unsigned long start, unsigned long end) +static inline void l2_clean_pa_range(unsigned long start, unsigned long end) { - unsigned long flags; + unsigned long va_start, va_end, flags; /* * Make sure 'start' and 'end' reference the same page, as @@ -51,17 +77,14 @@ static inline void l2_clean_mva_range(unsigned long start, unsigned long end) BUG_ON((start ^ end) >> PAGE_SHIFT); raw_local_irq_save(flags); + va_start = l2_start_va(start); + va_end = va_start + (end - start); __asm__("mcr p15, 1, %0, c15, c9, 4\n\t" "mcr p15, 1, %1, c15, c9, 5" - : : "r" (start), "r" (end)); + : : "r" (va_start), "r" (va_end)); raw_local_irq_restore(flags); } -static inline void l2_clean_pa_range(unsigned long start, unsigned long end) -{ - l2_clean_mva_range(__phys_to_virt(start), __phys_to_virt(end)); -} - static inline void l2_clean_inv_pa(unsigned long addr) { __asm__("mcr p15, 1, %0, c15, c10, 3" : : "r" (addr)); @@ -72,9 +95,9 @@ static inline void l2_inv_pa(unsigned long addr) __asm__("mcr p15, 1, %0, c15, c11, 3" : : "r" (addr)); } -static inline void l2_inv_mva_range(unsigned long start, unsigned long end) +static inline void l2_inv_pa_range(unsigned long start, unsigned long end) { - unsigned long flags; + unsigned long va_start, va_end, flags; /* * Make sure 'start' and 'end' reference the same page, as @@ -84,17 +107,14 @@ static inline void l2_inv_mva_range(unsigned long start, unsigned long end) BUG_ON((start ^ end) >> PAGE_SHIFT); raw_local_irq_save(flags); + va_start = l2_start_va(start); + va_end = va_start + (end - start); __asm__("mcr p15, 1, %0, c15, c11, 4\n\t" "mcr p15, 1, %1, c15, c11, 5" - : : "r" (start), "r" (end)); + : : "r" (va_start), "r" (va_end)); raw_local_irq_restore(flags); } -static inline void l2_inv_pa_range(unsigned long start, unsigned long end) -{ - l2_inv_mva_range(__phys_to_virt(start), __phys_to_virt(end)); -} - /* * Linux primitives. diff --git a/arch/arm/mm/cache-xsc3l2.c b/arch/arm/mm/cache-xsc3l2.c index 464de89..5d180cb 100644 --- a/arch/arm/mm/cache-xsc3l2.c +++ b/arch/arm/mm/cache-xsc3l2.c @@ -17,12 +17,14 @@ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #include <linux/init.h> -#include <linux/spinlock.h> -#include <linux/io.h> - #include <asm/system.h> #include <asm/cputype.h> #include <asm/cacheflush.h> +#include <asm/kmap_types.h> +#include <asm/fixmap.h> +#include <asm/pgtable.h> +#include <asm/tlbflush.h> +#include "mm.h" #define CR_L2 (1 << 26) @@ -47,21 +49,11 @@ static inline void xsc3_l2_clean_mva(unsigned long addr) __asm__("mcr p15, 1, %0, c7, c11, 1" : : "r" (addr)); } -static inline void xsc3_l2_clean_pa(unsigned long addr) -{ - xsc3_l2_clean_mva(__phys_to_virt(addr)); -} - static inline void xsc3_l2_inv_mva(unsigned long addr) { __asm__("mcr p15, 1, %0, c7, c7, 1" : : "r" (addr)); } -static inline void xsc3_l2_inv_pa(unsigned long addr) -{ - xsc3_l2_inv_mva(__phys_to_virt(addr)); -} - static inline void xsc3_l2_inv_all(void) { unsigned long l2ctype, set_way; @@ -79,50 +71,103 @@ static inline void xsc3_l2_inv_all(void) dsb(); } +#ifdef CONFIG_HIGHMEM +#define l2_map_save_flags(x) raw_local_save_flags(x) +#define l2_map_restore_flags(x) raw_local_irq_restore(x) +#else +#define l2_map_save_flags(x) ((x) = 0) +#define l2_map_restore_flags(x) ((void)(x)) +#endif + +static inline unsigned long l2_map_va(unsigned long pa, unsigned long prev_va, + unsigned long flags) +{ +#ifdef CONFIG_HIGHMEM + unsigned long va = prev_va & PAGE_MASK; + unsigned long pa_offset = pa << (32 - PAGE_SHIFT); + if (unlikely(pa_offset < (prev_va << (32 - PAGE_SHIFT)))) { + /* + * Switching to a new page. Because cache ops are + * using virtual addresses only, we must put a mapping + * in place for it. We also enable interrupts for a + * short while and disable them again to protect this + * mapping. + */ + unsigned long idx; + raw_local_irq_restore(flags); + idx = KM_L2_CACHE + KM_TYPE_NR * smp_processor_id(); + va = __fix_to_virt(FIX_KMAP_BEGIN + idx); + raw_local_irq_restore(flags | PSR_I_BIT); + set_pte_ext(TOP_PTE(va), pfn_pte(pa >> PAGE_SHIFT, PAGE_KERNEL), 0); + local_flush_tlb_kernel_page(va); + } + return va + (pa_offset >> (32 - PAGE_SHIFT)); +#else + return __phys_to_virt(pa); +#endif +} + static void xsc3_l2_inv_range(unsigned long start, unsigned long end) { + unsigned long vaddr, flags; + if (start == 0 && end == -1ul) { xsc3_l2_inv_all(); return; } + vaddr = -1; /* to force the first mapping */ + l2_map_save_flags(flags); + /* * Clean and invalidate partial first cache line. */ if (start & (CACHE_LINE_SIZE - 1)) { - xsc3_l2_clean_pa(start & ~(CACHE_LINE_SIZE - 1)); - xsc3_l2_inv_pa(start & ~(CACHE_LINE_SIZE - 1)); + vaddr = l2_map_va(start & ~(CACHE_LINE_SIZE - 1), vaddr, flags); + xsc3_l2_clean_mva(vaddr); + xsc3_l2_inv_mva(vaddr); start = (start | (CACHE_LINE_SIZE - 1)) + 1; } /* - * Clean and invalidate partial last cache line. + * Invalidate all full cache lines between 'start' and 'end'. */ - if (start < end && (end & (CACHE_LINE_SIZE - 1))) { - xsc3_l2_clean_pa(end & ~(CACHE_LINE_SIZE - 1)); - xsc3_l2_inv_pa(end & ~(CACHE_LINE_SIZE - 1)); - end &= ~(CACHE_LINE_SIZE - 1); + while (start < (end & ~(CACHE_LINE_SIZE - 1))) { + vaddr = l2_map_va(start, vaddr, flags); + xsc3_l2_inv_mva(vaddr); + start += CACHE_LINE_SIZE; } /* - * Invalidate all full cache lines between 'start' and 'end'. + * Clean and invalidate partial last cache line. */ - while (start < end) { - xsc3_l2_inv_pa(start); - start += CACHE_LINE_SIZE; + if (start < end) { + vaddr = l2_map_va(start, vaddr, flags); + xsc3_l2_clean_mva(vaddr); + xsc3_l2_inv_mva(vaddr); } + l2_map_restore_flags(flags); + dsb(); } static void xsc3_l2_clean_range(unsigned long start, unsigned long end) { + unsigned long vaddr, flags; + + vaddr = -1; /* to force the first mapping */ + l2_map_save_flags(flags); + start &= ~(CACHE_LINE_SIZE - 1); while (start < end) { - xsc3_l2_clean_pa(start); + vaddr = l2_map_va(start, vaddr, flags); + xsc3_l2_clean_mva(vaddr); start += CACHE_LINE_SIZE; } + l2_map_restore_flags(flags); + dsb(); } @@ -148,18 +193,26 @@ static inline void xsc3_l2_flush_all(void) static void xsc3_l2_flush_range(unsigned long start, unsigned long end) { + unsigned long vaddr, flags; + if (start == 0 && end == -1ul) { xsc3_l2_flush_all(); return; } + vaddr = -1; /* to force the first mapping */ + l2_map_save_flags(flags); + start &= ~(CACHE_LINE_SIZE - 1); while (start < end) { - xsc3_l2_clean_pa(start); - xsc3_l2_inv_pa(start); + vaddr = l2_map_va(start, vaddr, flags); + xsc3_l2_clean_mva(vaddr); + xsc3_l2_inv_mva(vaddr); start += CACHE_LINE_SIZE; } + l2_map_restore_flags(flags); + dsb(); } diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c index 310e479..510c179 100644 --- a/arch/arm/mm/dma-mapping.c +++ b/arch/arm/mm/dma-mapping.c @@ -19,6 +19,7 @@ #include <linux/dma-mapping.h> #include <asm/memory.h> +#include <asm/highmem.h> #include <asm/cacheflush.h> #include <asm/tlbflush.h> #include <asm/sizes.h> @@ -490,29 +491,101 @@ core_initcall(consistent_init); */ void dma_cache_maint(const void *start, size_t size, int direction) { - const void *end = start + size; + void (*inner_op)(const void *, const void *); + void (*outer_op)(unsigned long, unsigned long); - BUG_ON(!virt_addr_valid(start) || !virt_addr_valid(end - 1)); + BUG_ON(!virt_addr_valid(start) || !virt_addr_valid(start + size - 1)); switch (direction) { case DMA_FROM_DEVICE: /* invalidate only */ - dmac_inv_range(start, end); - outer_inv_range(__pa(start), __pa(end)); + inner_op = dmac_inv_range; + outer_op = outer_inv_range; break; case DMA_TO_DEVICE: /* writeback only */ - dmac_clean_range(start, end); - outer_clean_range(__pa(start), __pa(end)); + inner_op = dmac_clean_range; + outer_op = outer_clean_range; break; case DMA_BIDIRECTIONAL: /* writeback and invalidate */ - dmac_flush_range(start, end); - outer_flush_range(__pa(start), __pa(end)); + inner_op = dmac_flush_range; + outer_op = outer_flush_range; break; default: BUG(); } + + inner_op(start, start + size); + outer_op(__pa(start), __pa(start) + size); } EXPORT_SYMBOL(dma_cache_maint); +static void dma_cache_maint_contiguous(struct page *page, unsigned long offset, + size_t size, int direction) +{ + void *vaddr; + unsigned long paddr; + void (*inner_op)(const void *, const void *); + void (*outer_op)(unsigned long, unsigned long); + + switch (direction) { + case DMA_FROM_DEVICE: /* invalidate only */ + inner_op = dmac_inv_range; + outer_op = outer_inv_range; + break; + case DMA_TO_DEVICE: /* writeback only */ + inner_op = dmac_clean_range; + outer_op = outer_clean_range; + break; + case DMA_BIDIRECTIONAL: /* writeback and invalidate */ + inner_op = dmac_flush_range; + outer_op = outer_flush_range; + break; + default: + BUG(); + } + + if (!PageHighMem(page)) { + vaddr = page_address(page) + offset; + inner_op(vaddr, vaddr + size); + } else { + vaddr = kmap_high_get(page); + if (vaddr) { + vaddr += offset; + inner_op(vaddr, vaddr + size); + kunmap_high(page); + } + } + + paddr = page_to_phys(page) + offset; + outer_op(paddr, paddr + size); +} + +void dma_cache_maint_page(struct page *page, unsigned long offset, + size_t size, int dir) +{ + /* + * A single sg entry may refer to multiple physically contiguous + * pages. But we still need to process highmem pages individually. + * If highmem is not configured then the bulk of this loop gets + * optimized out. + */ + size_t left = size; + do { + size_t len = left; + if (PageHighMem(page) && len + offset > PAGE_SIZE) { + if (offset >= PAGE_SIZE) { + page += offset / PAGE_SIZE; + offset %= PAGE_SIZE; + } + len = PAGE_SIZE - offset; + } + dma_cache_maint_contiguous(page, offset, len, dir); + offset = 0; + page++; + left -= len; + } while (left); +} +EXPORT_SYMBOL(dma_cache_maint_page); + /** * dma_map_sg - map a set of SG buffers for streaming mode DMA * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices @@ -610,7 +683,8 @@ void dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, continue; if (!arch_is_coherent()) - dma_cache_maint(sg_virt(s), s->length, dir); + dma_cache_maint_page(sg_page(s), s->offset, + s->length, dir); } } EXPORT_SYMBOL(dma_sync_sg_for_device); diff --git a/arch/arm/mm/flush.c b/arch/arm/mm/flush.c index 0fa9bf3..4e28348 100644 --- a/arch/arm/mm/flush.c +++ b/arch/arm/mm/flush.c @@ -192,7 +192,7 @@ void flush_dcache_page(struct page *page) struct address_space *mapping = page_mapping(page); #ifndef CONFIG_SMP - if (mapping && !mapping_mapped(mapping)) + if (!PageHighMem(page) && mapping && !mapping_mapped(mapping)) set_bit(PG_dcache_dirty, &page->flags); else #endif diff --git a/arch/arm/mm/highmem.c b/arch/arm/mm/highmem.c new file mode 100644 index 0000000..a34954d --- /dev/null +++ b/arch/arm/mm/highmem.c @@ -0,0 +1,116 @@ +/* + * arch/arm/mm/highmem.c -- ARM highmem support + * + * Author: Nicolas Pitre + * Created: september 8, 2008 + * Copyright: Marvell Semiconductors Inc. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include <linux/module.h> +#include <linux/highmem.h> +#include <linux/interrupt.h> +#include <asm/fixmap.h> +#include <asm/cacheflush.h> +#include <asm/tlbflush.h> +#include "mm.h" + +void *kmap(struct page *page) +{ + might_sleep(); + if (!PageHighMem(page)) + return page_address(page); + return kmap_high(page); +} +EXPORT_SYMBOL(kmap); + +void kunmap(struct page *page) +{ + BUG_ON(in_interrupt()); + if (!PageHighMem(page)) + return; + kunmap_high(page); +} +EXPORT_SYMBOL(kunmap); + +void *kmap_atomic(struct page *page, enum km_type type) +{ + unsigned int idx; + unsigned long vaddr; + + pagefault_disable(); + if (!PageHighMem(page)) + return page_address(page); + + idx = type + KM_TYPE_NR * smp_processor_id(); + vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx); +#ifdef CONFIG_DEBUG_HIGHMEM + /* + * With debugging enabled, kunmap_atomic forces that entry to 0. + * Make sure it was indeed properly unmapped. + */ + BUG_ON(!pte_none(*(TOP_PTE(vaddr)))); +#endif + set_pte_ext(TOP_PTE(vaddr), mk_pte(page, kmap_prot), 0); + /* + * When debugging is off, kunmap_atomic leaves the previous mapping + * in place, so this TLB flush ensures the TLB is updated with the + * new mapping. + */ + local_flush_tlb_kernel_page(vaddr); + + return (void *)vaddr; +} +EXPORT_SYMBOL(kmap_atomic); + +void kunmap_atomic(void *kvaddr, enum km_type type) +{ + unsigned long vaddr = (unsigned long) kvaddr & PAGE_MASK; + unsigned int idx = type + KM_TYPE_NR * smp_processor_id(); + + if (kvaddr >= (void *)FIXADDR_START) { + __cpuc_flush_dcache_page((void *)vaddr); +#ifdef CONFIG_DEBUG_HIGHMEM + BUG_ON(vaddr != __fix_to_virt(FIX_KMAP_BEGIN + idx)); + set_pte_ext(TOP_PTE(vaddr), __pte(0), 0); + local_flush_tlb_kernel_page(vaddr); +#else + (void) idx; /* to kill a warning */ +#endif + } + pagefault_enable(); +} +EXPORT_SYMBOL(kunmap_atomic); + +void *kmap_atomic_pfn(unsigned long pfn, enum km_type type) +{ + unsigned int idx; + unsigned long vaddr; + + pagefault_disable(); + + idx = type + KM_TYPE_NR * smp_processor_id(); + vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx); +#ifdef CONFIG_DEBUG_HIGHMEM + BUG_ON(!pte_none(*(TOP_PTE(vaddr)))); +#endif + set_pte_ext(TOP_PTE(vaddr), pfn_pte(pfn, kmap_prot), 0); + local_flush_tlb_kernel_page(vaddr); + + return (void *)vaddr; +} + +struct page *kmap_atomic_to_page(const void *ptr) +{ + unsigned long vaddr = (unsigned long)ptr; + pte_t *pte; + + if (vaddr < FIXADDR_START) + return virt_to_page(ptr); + + pte = TOP_PTE(vaddr); + return pte_page(*pte); +} diff --git a/arch/arm/mm/init.c b/arch/arm/mm/init.c index 34df4d9..8277802 100644 --- a/arch/arm/mm/init.c +++ b/arch/arm/mm/init.c @@ -15,6 +15,7 @@ #include <linux/mman.h> #include <linux/nodemask.h> #include <linux/initrd.h> +#include <linux/highmem.h> #include <asm/mach-types.h> #include <asm/sections.h> @@ -382,7 +383,7 @@ void __init bootmem_init(void) for_each_node(node) bootmem_free_node(node, mi); - high_memory = __va(memend_pfn << PAGE_SHIFT); + high_memory = __va((memend_pfn << PAGE_SHIFT) - 1) + 1; /* * This doesn't seem to be used by the Linux memory manager any @@ -485,7 +486,7 @@ void __init mem_init(void) int i, node; #ifndef CONFIG_DISCONTIGMEM - max_mapnr = virt_to_page(high_memory) - mem_map; + max_mapnr = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map; #endif /* this will put all unused low memory onto the freelists */ @@ -504,6 +505,19 @@ void __init mem_init(void) __phys_to_pfn(__pa(swapper_pg_dir)), NULL); #endif +#ifdef CONFIG_HIGHMEM + /* set highmem page free */ + for_each_online_node(node) { + for_each_nodebank (i, &meminfo, node) { + unsigned long start = bank_pfn_start(&meminfo.bank[i]); + unsigned long end = bank_pfn_end(&meminfo.bank[i]); + if (start >= max_low_pfn + PHYS_PFN_OFFSET) + totalhigh_pages += free_area(start, end, NULL); + } + } + totalram_pages += totalhigh_pages; +#endif + /* * Since our memory may not be contiguous, calculate the * real number of pages we have in this system @@ -521,9 +535,10 @@ void __init mem_init(void) initsize = __init_end - __init_begin; printk(KERN_NOTICE "Memory: %luKB available (%dK code, " - "%dK data, %dK init)\n", + "%dK data, %dK init, %luK highmem)\n", (unsigned long) nr_free_pages() << (PAGE_SHIFT-10), - codesize >> 10, datasize >> 10, initsize >> 10); + codesize >> 10, datasize >> 10, initsize >> 10, + (unsigned long) (totalhigh_pages << (PAGE_SHIFT-10))); if (PAGE_SIZE >= 16384 && num_physpages <= 128) { extern int sysctl_overcommit_memory; diff --git a/arch/arm/mm/mm.h b/arch/arm/mm/mm.h index 95bbe11..c4f6f05 100644 --- a/arch/arm/mm/mm.h +++ b/arch/arm/mm/mm.h @@ -1,7 +1,6 @@ -/* the upper-most page table pointer */ - #ifdef CONFIG_MMU +/* the upper-most page table pointer */ extern pmd_t *top_pmd; #define TOP_PTE(x) pte_offset_kernel(top_pmd, x) diff --git a/arch/arm/mm/mmap.c b/arch/arm/mm/mmap.c index 5358fcc..f7457fe 100644 --- a/arch/arm/mm/mmap.c +++ b/arch/arm/mm/mmap.c @@ -124,7 +124,7 @@ int valid_phys_addr_range(unsigned long addr, size_t size) { if (addr < PHYS_OFFSET) return 0; - if (addr + size > __pa(high_memory)) + if (addr + size >= __pa(high_memory - 1)) return 0; return 1; diff --git a/arch/arm/mm/mmu.c b/arch/arm/mm/mmu.c index 8c6fc5a..1585814 100644 --- a/arch/arm/mm/mmu.c +++ b/arch/arm/mm/mmu.c @@ -18,9 +18,11 @@ #include <asm/cputype.h> #include <asm/mach-types.h> #include <asm/sections.h> +#include <asm/cachetype.h> #include <asm/setup.h> #include <asm/sizes.h> #include <asm/tlb.h> +#include <asm/highmem.h> #include <asm/mach/arch.h> #include <asm/mach/map.h> @@ -700,6 +702,10 @@ static void __init sanity_check_meminfo(void) if (meminfo.nr_banks >= NR_BANKS) { printk(KERN_CRIT "NR_BANKS too low, " "ignoring high memory\n"); + } else if (cache_is_vipt_aliasing()) { + printk(KERN_CRIT "HIGHMEM is not yet supported " + "with VIPT aliasing cache, " + "ignoring high memory\n"); } else { memmove(bank + 1, bank, (meminfo.nr_banks - i) * sizeof(*bank)); @@ -918,6 +924,17 @@ static void __init devicemaps_init(struct machine_desc *mdesc) flush_cache_all(); } +static void __init kmap_init(void) +{ +#ifdef CONFIG_HIGHMEM + pmd_t *pmd = pmd_off_k(PKMAP_BASE); + pte_t *pte = alloc_bootmem_low_pages(2 * PTRS_PER_PTE * sizeof(pte_t)); + BUG_ON(!pmd_none(*pmd) || !pte); + __pmd_populate(pmd, __pa(pte) | _PAGE_KERNEL_TABLE); + pkmap_page_table = pte + PTRS_PER_PTE; +#endif +} + /* * paging_init() sets up the page tables, initialises the zone memory * maps, and sets up the zero page, bad page and bad page tables. @@ -931,6 +948,7 @@ void __init paging_init(struct machine_desc *mdesc) prepare_page_table(); bootmem_init(); devicemaps_init(mdesc); + kmap_init(); top_pmd = pmd_off_k(0xffff0000); diff --git a/arch/arm/plat-omap/include/mach/memory.h b/arch/arm/plat-omap/include/mach/memory.h index d6b5ca6..99ed564 100644 --- a/arch/arm/plat-omap/include/mach/memory.h +++ b/arch/arm/plat-omap/include/mach/memory.h @@ -61,9 +61,11 @@ #define lbus_to_virt(x) ((x) - OMAP1510_LB_OFFSET + PAGE_OFFSET) #define is_lbus_device(dev) (cpu_is_omap15xx() && dev && (strncmp(dev_name(dev), "ohci", 4) == 0)) -#define __arch_page_to_dma(dev, page) ({is_lbus_device(dev) ? \ - (dma_addr_t)virt_to_lbus(page_address(page)) : \ - (dma_addr_t)__virt_to_phys(page_address(page));}) +#define __arch_page_to_dma(dev, page) \ + ({ dma_addr_t __dma = page_to_phys(page); \ + if (is_lbus_device(dev)) \ + __dma = __dma - PHYS_OFFSET + OMAP1510_LB_OFFSET; \ + __dma; }) #define __arch_dma_to_virt(dev, addr) ({ (void *) (is_lbus_device(dev) ? \ lbus_to_virt(addr) : \ diff --git a/mm/highmem.c b/mm/highmem.c index b36b83b..9101980 100644 --- a/mm/highmem.c +++ b/mm/highmem.c @@ -67,6 +67,25 @@ pte_t * pkmap_page_table; static DECLARE_WAIT_QUEUE_HEAD(pkmap_map_wait); +/* + * Most architectures have no use for kmap_high_get(), so let's abstract + * the disabling of IRQ out of the locking in that case to save on a + * potential useless overhead. + */ +#ifdef ARCH_NEEDS_KMAP_HIGH_GET +#define lock_kmap() spin_lock_irq(&kmap_lock) +#define unlock_kmap() spin_unlock_irq(&kmap_lock) +#define lock_kmap_any(flags) spin_lock_irqsave(&kmap_lock, flags) +#define unlock_kmap_any(flags) spin_unlock_irqrestore(&kmap_lock, flags) +#else +#define lock_kmap() spin_lock(&kmap_lock) +#define unlock_kmap() spin_unlock(&kmap_lock) +#define lock_kmap_any(flags) \ + do { spin_lock(&kmap_lock); (void)(flags); } while (0) +#define unlock_kmap_any(flags) \ + do { spin_unlock(&kmap_lock); (void)(flags); } while (0) +#endif + static void flush_all_zero_pkmaps(void) { int i; @@ -113,9 +132,9 @@ static void flush_all_zero_pkmaps(void) */ void kmap_flush_unused(void) { - spin_lock(&kmap_lock); + lock_kmap(); flush_all_zero_pkmaps(); - spin_unlock(&kmap_lock); + unlock_kmap(); } static inline unsigned long map_new_virtual(struct page *page) @@ -145,10 +164,10 @@ start: __set_current_state(TASK_UNINTERRUPTIBLE); add_wait_queue(&pkmap_map_wait, &wait); - spin_unlock(&kmap_lock); + unlock_kmap(); schedule(); remove_wait_queue(&pkmap_map_wait, &wait); - spin_lock(&kmap_lock); + lock_kmap(); /* Somebody else might have mapped it while we slept */ if (page_address(page)) @@ -184,29 +203,59 @@ void *kmap_high(struct page *page) * For highmem pages, we can't trust "virtual" until * after we have the lock. */ - spin_lock(&kmap_lock); + lock_kmap(); vaddr = (unsigned long)page_address(page); if (!vaddr) vaddr = map_new_virtual(page); pkmap_count[PKMAP_NR(vaddr)]++; BUG_ON(pkmap_count[PKMAP_NR(vaddr)] < 2); - spin_unlock(&kmap_lock); + unlock_kmap(); return (void*) vaddr; } EXPORT_SYMBOL(kmap_high); +#ifdef ARCH_NEEDS_KMAP_HIGH_GET +/** + * kmap_high_get - pin a highmem page into memory + * @page: &struct page to pin + * + * Returns the page's current virtual memory address, or NULL if no mapping + * exists. When and only when a non null address is returned then a + * matching call to kunmap_high() is necessary. + * + * This can be called from any context. + */ +void *kmap_high_get(struct page *page) +{ + unsigned long vaddr, flags; + + lock_kmap_any(flags); + vaddr = (unsigned long)page_address(page); + if (vaddr) { + BUG_ON(pkmap_count[PKMAP_NR(vaddr)] < 1); + pkmap_count[PKMAP_NR(vaddr)]++; + } + unlock_kmap_any(flags); + return (void*) vaddr; +} +#endif + /** * kunmap_high - map a highmem page into memory * @page: &struct page to unmap + * + * If ARCH_NEEDS_KMAP_HIGH_GET is not defined then this may be called + * only from user context. */ void kunmap_high(struct page *page) { unsigned long vaddr; unsigned long nr; + unsigned long flags; int need_wakeup; - spin_lock(&kmap_lock); + lock_kmap_any(flags); vaddr = (unsigned long)page_address(page); BUG_ON(!vaddr); nr = PKMAP_NR(vaddr); @@ -232,7 +281,7 @@ void kunmap_high(struct page *page) */ need_wakeup = waitqueue_active(&pkmap_map_wait); } - spin_unlock(&kmap_lock); + unlock_kmap_any(flags); /* do wake-up, if needed, race-free outside of the spin lock */ if (need_wakeup) |