powerpc: Move dma-noncoherent.c from arch/powerpc/lib to arch/powerpc/mm

(pre-requisite to make the next patches more palatable)

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

2 files changed, 0 insertions, 427 deletions

diff --git a/arch/powerpc/lib/Makefile b/arch/powerpc/lib/Makefile
index 8db35278a4b4..29b742b90f1f 100644
--- a/arch/powerpc/lib/Makefile
+++ b/arch/powerpc/lib/Makefile
@@ -18,7 +18,6 @@ obj-$(CONFIG_PPC64)	+= copypage_64.o copyuser_64.o \
                            memcpy_64.o usercopy_64.o mem_64.o string.o
 obj-$(CONFIG_XMON)      += sstep.o
 obj-$(CONFIG_KPROBES)   += sstep.o
-obj-$(CONFIG_NOT_COHERENT_CACHE)        += dma-noncoherent.o
 
 ifeq ($(CONFIG_PPC64),y)
 obj-$(CONFIG_SMP)       += locks.o
diff --git a/arch/powerpc/lib/dma-noncoherent.c b/arch/powerpc/lib/dma-noncoherent.c
deleted file mode 100644
index b7dc4c19f582..000000000000
--- a/arch/powerpc/lib/dma-noncoherent.c
+++ /dev/null
@@ -1,426 +0,0 @@
-/*
- *  PowerPC version derived from arch/arm/mm/consistent.c
- *    Copyright (C) 2001 Dan Malek (dmalek@jlc.net)
- *
- *  Copyright (C) 2000 Russell King
- *
- * Consistent memory allocators.  Used for DMA devices that want to
- * share uncached memory with the processor core.  The function return
- * is the virtual address and 'dma_handle' is the physical address.
- * Mostly stolen from the ARM port, with some changes for PowerPC.
- *                                              -- Dan
- *
- * Reorganized to get rid of the arch-specific consistent_* functions
- * and provide non-coherent implementations for the DMA API. -Matt
- *
- * Added in_interrupt() safe dma_alloc_coherent()/dma_free_coherent()
- * implementation. This is pulled straight from ARM and barely
- * modified. -Matt
- *
- * 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/sched.h>
-#include <linux/kernel.h>
-#include <linux/errno.h>
-#include <linux/string.h>
-#include <linux/types.h>
-#include <linux/highmem.h>
-#include <linux/dma-mapping.h>
-
-#include <asm/tlbflush.h>
-
-/*
- * This address range defaults to a value that is safe for all
- * platforms which currently set CONFIG_NOT_COHERENT_CACHE. It
- * can be further configured for specific applications under
- * the "Advanced Setup" menu. -Matt
- */
-#define CONSISTENT_BASE (CONFIG_CONSISTENT_START)
-#define CONSISTENT_END  (CONFIG_CONSISTENT_START + CONFIG_CONSISTENT_SIZE)
-#define CONSISTENT_OFFSET(x)    (((unsigned long)(x) - CONSISTENT_BASE) >> PAGE_SHIFT)
-
-/*
- * This is the page table (2MB) covering uncached, DMA consistent allocations
- */
-static pte_t *consistent_pte;
-static DEFINE_SPINLOCK(consistent_lock);
-
-/*
- * VM region handling support.
- *
- * This should become something generic, handling VM region allocations for
- * vmalloc and similar (ioremap, module space, etc).
- *
- * I envisage vmalloc()'s supporting vm_struct becoming:
- *
- *  struct vm_struct {
- *    struct vm_region  region;
- *    unsigned long     flags;
- *    struct page       **pages;
- *    unsigned int      nr_pages;
- *    unsigned long     phys_addr;
- *  };
- *
- * get_vm_area() would then call vm_region_alloc with an appropriate
- * struct vm_region head (eg):
- *
- *  struct vm_region vmalloc_head = {
- *      .vm_list        = LIST_HEAD_INIT(vmalloc_head.vm_list),
- *      .vm_start       = VMALLOC_START,
- *      .vm_end         = VMALLOC_END,
- *  };
- *
- * However, vmalloc_head.vm_start is variable (typically, it is dependent on
- * the amount of RAM found at boot time.)  I would imagine that get_vm_area()
- * would have to initialise this each time prior to calling vm_region_alloc().
- */
-struct ppc_vm_region {
-        struct list_head        vm_list;
-        unsigned long           vm_start;
-        unsigned long           vm_end;
-};
-
-static struct ppc_vm_region consistent_head = {
-        .vm_list        = LIST_HEAD_INIT(consistent_head.vm_list),
-        .vm_start       = CONSISTENT_BASE,
-        .vm_end         = CONSISTENT_END,
-};
-
-static struct ppc_vm_region *
-ppc_vm_region_alloc(struct ppc_vm_region *head, size_t size, gfp_t gfp)
-{
-        unsigned long addr = head->vm_start, end = head->vm_end - size;
-        unsigned long flags;
-        struct ppc_vm_region *c, *new;
-
-        new = kmalloc(sizeof(struct ppc_vm_region), gfp);
-        if (!new)
-                goto out;
-
-        spin_lock_irqsave(&consistent_lock, flags);
-
-        list_for_each_entry(c, &head->vm_list, vm_list) {
-                if ((addr + size) < addr)
-                        goto nospc;
-                if ((addr + size) <= c->vm_start)
-                        goto found;
-                addr = c->vm_end;
-                if (addr > end)
-                        goto nospc;
-        }
-
- found:
-        /*
-         * Insert this entry _before_ the one we found.
-         */
-        list_add_tail(&new->vm_list, &c->vm_list);
-        new->vm_start = addr;
-        new->vm_end = addr + size;
-
-        spin_unlock_irqrestore(&consistent_lock, flags);
-        return new;
-
- nospc:
-        spin_unlock_irqrestore(&consistent_lock, flags);
-        kfree(new);
- out:
-        return NULL;
-}
-
-static struct ppc_vm_region *ppc_vm_region_find(struct ppc_vm_region *head, unsigned long addr)
-{
-        struct ppc_vm_region *c;
-
-        list_for_each_entry(c, &head->vm_list, vm_list) {
-                if (c->vm_start == addr)
-                        goto out;
-        }
-        c = NULL;
- out:
-        return c;
-}
-
-/*
- * Allocate DMA-coherent memory space and return both the kernel remapped
- * virtual and bus address for that space.
- */
-void *
-__dma_alloc_coherent(size_t size, dma_addr_t *handle, gfp_t gfp)
-{
-        struct page *page;
-        struct ppc_vm_region *c;
-        unsigned long order;
-        u64 mask = 0x00ffffff, limit; /* ISA default */
-
-        if (!consistent_pte) {
-                printk(KERN_ERR "%s: not initialised\n", __func__);
-                dump_stack();
-                return NULL;
-        }
-
-        size = PAGE_ALIGN(size);
-        limit = (mask + 1) & ~mask;
-        if ((limit && size >= limit) || size >= (CONSISTENT_END - CONSISTENT_BASE)) {
-                printk(KERN_WARNING "coherent allocation too big (requested %#x mask %#Lx)\n",
-                       size, mask);
-                return NULL;
-        }
-
-        order = get_order(size);
-
-        if (mask != 0xffffffff)
-                gfp |= GFP_DMA;
-
-        page = alloc_pages(gfp, order);
-        if (!page)
-                goto no_page;
-
-        /*
-         * Invalidate any data that might be lurking in the
-         * kernel direct-mapped region for device DMA.
-         */
-        {
-                unsigned long kaddr = (unsigned long)page_address(page);
-                memset(page_address(page), 0, size);
-                flush_dcache_range(kaddr, kaddr + size);
-        }
-
-        /*
-         * Allocate a virtual address in the consistent mapping region.
-         */
-        c = ppc_vm_region_alloc(&consistent_head, size,
-                            gfp & ~(__GFP_DMA | __GFP_HIGHMEM));
-        if (c) {
-                unsigned long vaddr = c->vm_start;
-                pte_t *pte = consistent_pte + CONSISTENT_OFFSET(vaddr);
-                struct page *end = page + (1 << order);
-
-                split_page(page, order);
-
-                /*
-                 * Set the "dma handle"
-                 */
-                *handle = page_to_phys(page);
-
-                do {
-                        BUG_ON(!pte_none(*pte));
-
-                        SetPageReserved(page);
-                        set_pte_at(&init_mm, vaddr,
-                                   pte, mk_pte(page, pgprot_noncached(PAGE_KERNEL)));
-                        page++;
-                        pte++;
-                        vaddr += PAGE_SIZE;
-                } while (size -= PAGE_SIZE);
-
-                /*
-                 * Free the otherwise unused pages.
-                 */
-                while (page < end) {
-                        __free_page(page);
-                        page++;
-                }
-
-                return (void *)c->vm_start;
-        }
-
-        if (page)
-                __free_pages(page, order);
- no_page:
-        return NULL;
-}
-EXPORT_SYMBOL(__dma_alloc_coherent);
-
-/*
- * free a page as defined by the above mapping.
- */
-void __dma_free_coherent(size_t size, void *vaddr)
-{
-        struct ppc_vm_region *c;
-        unsigned long flags, addr;
-        pte_t *ptep;
-
-        size = PAGE_ALIGN(size);
-
-        spin_lock_irqsave(&consistent_lock, flags);
-
-        c = ppc_vm_region_find(&consistent_head, (unsigned long)vaddr);
-        if (!c)
-                goto no_area;
-
-        if ((c->vm_end - c->vm_start) != size) {
-                printk(KERN_ERR "%s: freeing wrong coherent size (%ld != %d)\n",
-                       __func__, c->vm_end - c->vm_start, size);
-                dump_stack();
-                size = c->vm_end - c->vm_start;
-        }
-
-        ptep = consistent_pte + CONSISTENT_OFFSET(c->vm_start);
-        addr = c->vm_start;
-        do {
-                pte_t pte = ptep_get_and_clear(&init_mm, addr, ptep);
-                unsigned long pfn;
-
-                ptep++;
-                addr += PAGE_SIZE;
-
-                if (!pte_none(pte) && pte_present(pte)) {
-                        pfn = pte_pfn(pte);
-
-                        if (pfn_valid(pfn)) {
-                                struct page *page = pfn_to_page(pfn);
-                                ClearPageReserved(page);
-
-                                __free_page(page);
-                                continue;
-                        }
-                }
-
-                printk(KERN_CRIT "%s: bad page in kernel page table\n",
-                       __func__);
-        } while (size -= PAGE_SIZE);
-
-        flush_tlb_kernel_range(c->vm_start, c->vm_end);
-
-        list_del(&c->vm_list);
-
-        spin_unlock_irqrestore(&consistent_lock, flags);
-
-        kfree(c);
-        return;
-
- no_area:
-        spin_unlock_irqrestore(&consistent_lock, flags);
-        printk(KERN_ERR "%s: trying to free invalid coherent area: %p\n",
-               __func__, vaddr);
-        dump_stack();
-}
-EXPORT_SYMBOL(__dma_free_coherent);
-
-/*
- * Initialise the consistent memory allocation.
- */
-static int __init dma_alloc_init(void)
-{
-        pgd_t *pgd;
-        pud_t *pud;
-        pmd_t *pmd;
-        pte_t *pte;
-        int ret = 0;
-
-        do {
-                pgd = pgd_offset(&init_mm, CONSISTENT_BASE);
-                pud = pud_alloc(&init_mm, pgd, CONSISTENT_BASE);
-                pmd = pmd_alloc(&init_mm, pud, CONSISTENT_BASE);
-                if (!pmd) {
-                        printk(KERN_ERR "%s: no pmd tables\n", __func__);
-                        ret = -ENOMEM;
-                        break;
-                }
-
-                pte = pte_alloc_kernel(pmd, CONSISTENT_BASE);
-                if (!pte) {
-                        printk(KERN_ERR "%s: no pte tables\n", __func__);
-                        ret = -ENOMEM;
-                        break;
-                }
-
-                consistent_pte = pte;
-        } while (0);
-
-        return ret;
-}
-
-core_initcall(dma_alloc_init);
-
-/*
- * make an area consistent.
- */
-void __dma_sync(void *vaddr, size_t size, int direction)
-{
-        unsigned long start = (unsigned long)vaddr;
-        unsigned long end   = start + size;
-
-        switch (direction) {
-        case DMA_NONE:
-                BUG();
-        case DMA_FROM_DEVICE:
-                /*
-                 * invalidate only when cache-line aligned otherwise there is
-                 * the potential for discarding uncommitted data from the cache
-                 */
-                if ((start & (L1_CACHE_BYTES - 1)) || (size & (L1_CACHE_BYTES - 1)))
-                        flush_dcache_range(start, end);
-                else
-                        invalidate_dcache_range(start, end);
-                break;
-        case DMA_TO_DEVICE:             /* writeback only */
-                clean_dcache_range(start, end);
-                break;
-        case DMA_BIDIRECTIONAL: /* writeback and invalidate */
-                flush_dcache_range(start, end);
-                break;
-        }
-}
-EXPORT_SYMBOL(__dma_sync);
-
-#ifdef CONFIG_HIGHMEM
-/*
- * __dma_sync_page() implementation for systems using highmem.
- * In this case, each page of a buffer must be kmapped/kunmapped
- * in order to have a virtual address for __dma_sync(). This must
- * not sleep so kmap_atomic()/kunmap_atomic() are used.
- *
- * Note: yes, it is possible and correct to have a buffer extend
- * beyond the first page.
- */
-static inline void __dma_sync_page_highmem(struct page *page,
-                unsigned long offset, size_t size, int direction)
-{
-        size_t seg_size = min((size_t)(PAGE_SIZE - offset), size);
-        size_t cur_size = seg_size;
-        unsigned long flags, start, seg_offset = offset;
-        int nr_segs = 1 + ((size - seg_size) + PAGE_SIZE - 1)/PAGE_SIZE;
-        int seg_nr = 0;
-
-        local_irq_save(flags);
-
-        do {
-                start = (unsigned long)kmap_atomic(page + seg_nr,
-                                KM_PPC_SYNC_PAGE) + seg_offset;
-
-                /* Sync this buffer segment */
-                __dma_sync((void *)start, seg_size, direction);
-                kunmap_atomic((void *)start, KM_PPC_SYNC_PAGE);
-                seg_nr++;
-
-                /* Calculate next buffer segment size */
-                seg_size = min((size_t)PAGE_SIZE, size - cur_size);
-
-                /* Add the segment size to our running total */
-                cur_size += seg_size;
-                seg_offset = 0;
-        } while (seg_nr < nr_segs);
-
-        local_irq_restore(flags);
-}
-#endif /* CONFIG_HIGHMEM */
-
-/*
- * __dma_sync_page makes memory consistent. identical to __dma_sync, but
- * takes a struct page instead of a virtual address
- */
-void __dma_sync_page(struct page *page, unsigned long offset,
-        size_t size, int direction)
-{
-#ifdef CONFIG_HIGHMEM
-        __dma_sync_page_highmem(page, offset, size, direction);
-#else
-        unsigned long start = (unsigned long)page_address(page) + offset;
-        __dma_sync((void *)start, size, direction);
-#endif
-}
-EXPORT_SYMBOL(__dma_sync_page);