diff options
Diffstat (limited to 'arch/sh/mm')
| -rw-r--r-- | arch/sh/mm/Makefile_32 | 1 | ||||
| -rw-r--r-- | arch/sh/mm/Makefile_64 | 1 | ||||
| -rw-r--r-- | arch/sh/mm/asids-debugfs.c | 79 | ||||
| -rw-r--r-- | arch/sh/mm/consistent.c | 7 | ||||
| -rw-r--r-- | arch/sh/mm/fault_32.c | 17 | ||||
| -rw-r--r-- | arch/sh/mm/ioremap_32.c | 3 | ||||
| -rw-r--r-- | arch/sh/mm/mmap.c | 94 |
7 files changed, 183 insertions, 19 deletions
diff --git a/arch/sh/mm/Makefile_32 b/arch/sh/mm/Makefile_32 index f066e76da204..cb2f3f299591 100644 --- a/arch/sh/mm/Makefile_32 +++ b/arch/sh/mm/Makefile_32 @@ -18,6 +18,7 @@ mmu-y := tlb-nommu.o pg-nommu.o mmu-$(CONFIG_MMU) := fault_32.o tlbflush_32.o ioremap_32.o obj-y += $(mmu-y) +obj-$(CONFIG_DEBUG_FS) += asids-debugfs.o ifdef CONFIG_DEBUG_FS obj-$(CONFIG_CPU_SH4) += cache-debugfs.o diff --git a/arch/sh/mm/Makefile_64 b/arch/sh/mm/Makefile_64 index 9481d0f54efd..2863ffb7006d 100644 --- a/arch/sh/mm/Makefile_64 +++ b/arch/sh/mm/Makefile_64 @@ -13,6 +13,7 @@ obj-y += cache-sh5.o endif obj-y += $(mmu-y) +obj-$(CONFIG_DEBUG_FS) += asids-debugfs.o obj-$(CONFIG_HUGETLB_PAGE) += hugetlbpage.o obj-$(CONFIG_NUMA) += numa.o diff --git a/arch/sh/mm/asids-debugfs.c b/arch/sh/mm/asids-debugfs.c new file mode 100644 index 000000000000..8e912a15e94f --- /dev/null +++ b/arch/sh/mm/asids-debugfs.c @@ -0,0 +1,79 @@ +/* + * debugfs ops for process ASIDs + * + * Copyright (C) 2000, 2001 Paolo Alberelli + * Copyright (C) 2003 - 2008 Paul Mundt + * Copyright (C) 2003, 2004 Richard Curnow + * + * Provides a debugfs file that lists out the ASIDs currently associated + * with the processes. + * + * In the SH-5 case, if the DM.PC register is examined through the debug + * link, this shows ASID + PC. To make use of this, the PID->ASID + * relationship needs to be known. This is primarily for debugging. + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + */ +#include <linux/init.h> +#include <linux/module.h> +#include <linux/debugfs.h> +#include <linux/seq_file.h> +#include <linux/spinlock.h> +#include <asm/processor.h> +#include <asm/mmu_context.h> + +static int asids_seq_show(struct seq_file *file, void *iter) +{ + struct task_struct *p; + + read_lock(&tasklist_lock); + + for_each_process(p) { + int pid = p->pid; + + if (unlikely(!pid)) + continue; + + if (p->mm) + seq_printf(file, "%5d : %02lx\n", pid, + cpu_asid(smp_processor_id(), p->mm)); + else + seq_printf(file, "%5d : (none)\n", pid); + } + + read_unlock(&tasklist_lock); + + return 0; +} + +static int asids_debugfs_open(struct inode *inode, struct file *file) +{ + return single_open(file, asids_seq_show, inode->i_private); +} + +static const struct file_operations asids_debugfs_fops = { + .owner = THIS_MODULE, + .open = asids_debugfs_open, + .read = seq_read, + .llseek = seq_lseek, + .release = single_release, +}; + +static int __init asids_debugfs_init(void) +{ + struct dentry *asids_dentry; + + asids_dentry = debugfs_create_file("asids", S_IRUSR, sh_debugfs_root, + NULL, &asids_debugfs_fops); + if (!asids_dentry) + return -ENOMEM; + if (IS_ERR(asids_dentry)) + return PTR_ERR(asids_dentry); + + return 0; +} +module_init(asids_debugfs_init); + +MODULE_LICENSE("GPL v2"); diff --git a/arch/sh/mm/consistent.c b/arch/sh/mm/consistent.c index 9f8ea3ada4db..edcd5fbf9651 100644 --- a/arch/sh/mm/consistent.c +++ b/arch/sh/mm/consistent.c @@ -42,6 +42,8 @@ void *dma_alloc_coherent(struct device *dev, size_t size, return NULL; } + split_page(pfn_to_page(virt_to_phys(ret) >> PAGE_SHIFT), order); + *dma_handle = virt_to_phys(ret); return ret_nocache; } @@ -51,10 +53,13 @@ void dma_free_coherent(struct device *dev, size_t size, void *vaddr, dma_addr_t dma_handle) { int order = get_order(size); + unsigned long pfn = dma_handle >> PAGE_SHIFT; + int k; if (!dma_release_from_coherent(dev, order, vaddr)) { WARN_ON(irqs_disabled()); /* for portability */ - free_pages((unsigned long)phys_to_virt(dma_handle), order); + for (k = 0; k < (1 << order); k++) + __free_pages(pfn_to_page(pfn + k), 0); iounmap(vaddr); } } diff --git a/arch/sh/mm/fault_32.c b/arch/sh/mm/fault_32.c index 898d477e47c1..31a33ebdef6f 100644 --- a/arch/sh/mm/fault_32.c +++ b/arch/sh/mm/fault_32.c @@ -20,7 +20,6 @@ #include <asm/system.h> #include <asm/mmu_context.h> #include <asm/tlbflush.h> -#include <asm/kgdb.h> /* * This routine handles page faults. It determines the address, @@ -265,17 +264,6 @@ static inline int notify_page_fault(struct pt_regs *regs, int trap) return ret; } -#ifdef CONFIG_SH_STORE_QUEUES -/* - * This is a special case for the SH-4 store queues, as pages for this - * space still need to be faulted in before it's possible to flush the - * store queue cache for writeout to the remapped region. - */ -#define P3_ADDR_MAX (P4SEG_STORE_QUE + 0x04000000) -#else -#define P3_ADDR_MAX P4SEG -#endif - /* * Called with interrupts disabled. */ @@ -293,11 +281,6 @@ asmlinkage int __kprobes __do_page_fault(struct pt_regs *regs, if (notify_page_fault(regs, lookup_exception_vector())) goto out; -#ifdef CONFIG_SH_KGDB - if (kgdb_nofault && kgdb_bus_err_hook) - kgdb_bus_err_hook(); -#endif - ret = 1; /* diff --git a/arch/sh/mm/ioremap_32.c b/arch/sh/mm/ioremap_32.c index 882a32ebc6b7..32946fba123e 100644 --- a/arch/sh/mm/ioremap_32.c +++ b/arch/sh/mm/ioremap_32.c @@ -116,9 +116,10 @@ EXPORT_SYMBOL(__ioremap); void __iounmap(void __iomem *addr) { unsigned long vaddr = (unsigned long __force)addr; + unsigned long seg = PXSEG(vaddr); struct vm_struct *p; - if (PXSEG(vaddr) < P3SEG || is_pci_memaddr(vaddr)) + if (seg < P3SEG || seg >= P3_ADDR_MAX || is_pci_memaddr(vaddr)) return; #ifdef CONFIG_32BIT diff --git a/arch/sh/mm/mmap.c b/arch/sh/mm/mmap.c index 8837d511710a..931f4d003fa0 100644 --- a/arch/sh/mm/mmap.c +++ b/arch/sh/mm/mmap.c @@ -9,7 +9,101 @@ */ #include <linux/io.h> #include <linux/mm.h> +#include <linux/mman.h> +#include <linux/module.h> #include <asm/page.h> +#include <asm/processor.h> + +#ifdef CONFIG_MMU +unsigned long shm_align_mask = PAGE_SIZE - 1; /* Sane caches */ +EXPORT_SYMBOL(shm_align_mask); + +/* + * To avoid cache aliases, we map the shared page with same color. + */ +#define COLOUR_ALIGN(addr, pgoff) \ + ((((addr) + shm_align_mask) & ~shm_align_mask) + \ + (((pgoff) << PAGE_SHIFT) & shm_align_mask)) + +unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, + unsigned long len, unsigned long pgoff, unsigned long flags) +{ + struct mm_struct *mm = current->mm; + struct vm_area_struct *vma; + unsigned long start_addr; + int do_colour_align; + + if (flags & MAP_FIXED) { + /* We do not accept a shared mapping if it would violate + * cache aliasing constraints. + */ + if ((flags & MAP_SHARED) && (addr & shm_align_mask)) + return -EINVAL; + return addr; + } + + if (unlikely(len > TASK_SIZE)) + return -ENOMEM; + + do_colour_align = 0; + if (filp || (flags & MAP_SHARED)) + do_colour_align = 1; + + if (addr) { + if (do_colour_align) + addr = COLOUR_ALIGN(addr, pgoff); + else + addr = PAGE_ALIGN(addr); + + vma = find_vma(mm, addr); + if (TASK_SIZE - len >= addr && + (!vma || addr + len <= vma->vm_start)) + return addr; + } + + if (len > mm->cached_hole_size) { + start_addr = addr = mm->free_area_cache; + } else { + mm->cached_hole_size = 0; + start_addr = addr = TASK_UNMAPPED_BASE; + } + +full_search: + if (do_colour_align) + addr = COLOUR_ALIGN(addr, pgoff); + else + addr = PAGE_ALIGN(mm->free_area_cache); + + for (vma = find_vma(mm, addr); ; vma = vma->vm_next) { + /* At this point: (!vma || addr < vma->vm_end). */ + if (unlikely(TASK_SIZE - len < addr)) { + /* + * Start a new search - just in case we missed + * some holes. + */ + if (start_addr != TASK_UNMAPPED_BASE) { + start_addr = addr = TASK_UNMAPPED_BASE; + mm->cached_hole_size = 0; + goto full_search; + } + return -ENOMEM; + } + if (likely(!vma || addr + len <= vma->vm_start)) { + /* + * Remember the place where we stopped the search: + */ + mm->free_area_cache = addr + len; + return addr; + } + if (addr + mm->cached_hole_size < vma->vm_start) + mm->cached_hole_size = vma->vm_start - addr; + + addr = vma->vm_end; + if (do_colour_align) + addr = COLOUR_ALIGN(addr, pgoff); + } +} +#endif /* CONFIG_MMU */ /* * You really shouldn't be using read() or write() on /dev/mem. This |