From 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 Mon Sep 17 00:00:00 2001 From: Yunhong Jiang Date: Tue, 4 Aug 2015 12:17:53 -0700 Subject: Add the rt linux 4.1.3-rt3 as base Import the rt linux 4.1.3-rt3 as OPNFV kvm base. It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and the base is: commit 0917f823c59692d751951bf5ea699a2d1e2f26a2 Author: Sebastian Andrzej Siewior Date: Sat Jul 25 12:13:34 2015 +0200 Prepare v4.1.3-rt3 Signed-off-by: Sebastian Andrzej Siewior We lose all the git history this way and it's not good. We should apply another opnfv project repo in future. Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423 Signed-off-by: Yunhong Jiang --- kernel/arch/sh/mm/consistent.c | 159 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 159 insertions(+) create mode 100644 kernel/arch/sh/mm/consistent.c (limited to 'kernel/arch/sh/mm/consistent.c') diff --git a/kernel/arch/sh/mm/consistent.c b/kernel/arch/sh/mm/consistent.c new file mode 100644 index 000000000..b81d9dbf9 --- /dev/null +++ b/kernel/arch/sh/mm/consistent.c @@ -0,0 +1,159 @@ +/* + * arch/sh/mm/consistent.c + * + * Copyright (C) 2004 - 2007 Paul Mundt + * + * Declared coherent memory functions based on arch/x86/kernel/pci-dma_32.c + * + * 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 +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define PREALLOC_DMA_DEBUG_ENTRIES 4096 + +struct dma_map_ops *dma_ops; +EXPORT_SYMBOL(dma_ops); + +static int __init dma_init(void) +{ + dma_debug_init(PREALLOC_DMA_DEBUG_ENTRIES); + return 0; +} +fs_initcall(dma_init); + +void *dma_generic_alloc_coherent(struct device *dev, size_t size, + dma_addr_t *dma_handle, gfp_t gfp, + struct dma_attrs *attrs) +{ + void *ret, *ret_nocache; + int order = get_order(size); + + gfp |= __GFP_ZERO; + + ret = (void *)__get_free_pages(gfp, order); + if (!ret) + return NULL; + + /* + * Pages from the page allocator may have data present in + * cache. So flush the cache before using uncached memory. + */ + dma_cache_sync(dev, ret, size, DMA_BIDIRECTIONAL); + + ret_nocache = (void __force *)ioremap_nocache(virt_to_phys(ret), size); + if (!ret_nocache) { + free_pages((unsigned long)ret, order); + return NULL; + } + + split_page(pfn_to_page(virt_to_phys(ret) >> PAGE_SHIFT), order); + + *dma_handle = virt_to_phys(ret); + + return ret_nocache; +} + +void dma_generic_free_coherent(struct device *dev, size_t size, + void *vaddr, dma_addr_t dma_handle, + struct dma_attrs *attrs) +{ + int order = get_order(size); + unsigned long pfn = dma_handle >> PAGE_SHIFT; + int k; + + for (k = 0; k < (1 << order); k++) + __free_pages(pfn_to_page(pfn + k), 0); + + iounmap(vaddr); +} + +void dma_cache_sync(struct device *dev, void *vaddr, size_t size, + enum dma_data_direction direction) +{ + void *addr; + + addr = __in_29bit_mode() ? + (void *)CAC_ADDR((unsigned long)vaddr) : vaddr; + + switch (direction) { + case DMA_FROM_DEVICE: /* invalidate only */ + __flush_invalidate_region(addr, size); + break; + case DMA_TO_DEVICE: /* writeback only */ + __flush_wback_region(addr, size); + break; + case DMA_BIDIRECTIONAL: /* writeback and invalidate */ + __flush_purge_region(addr, size); + break; + default: + BUG(); + } +} +EXPORT_SYMBOL(dma_cache_sync); + +static int __init memchunk_setup(char *str) +{ + return 1; /* accept anything that begins with "memchunk." */ +} +__setup("memchunk.", memchunk_setup); + +static void __init memchunk_cmdline_override(char *name, unsigned long *sizep) +{ + char *p = boot_command_line; + int k = strlen(name); + + while ((p = strstr(p, "memchunk."))) { + p += 9; /* strlen("memchunk.") */ + if (!strncmp(name, p, k) && p[k] == '=') { + p += k + 1; + *sizep = memparse(p, NULL); + pr_info("%s: forcing memory chunk size to 0x%08lx\n", + name, *sizep); + break; + } + } +} + +int __init platform_resource_setup_memory(struct platform_device *pdev, + char *name, unsigned long memsize) +{ + struct resource *r; + dma_addr_t dma_handle; + void *buf; + + r = pdev->resource + pdev->num_resources - 1; + if (r->flags) { + pr_warning("%s: unable to find empty space for resource\n", + name); + return -EINVAL; + } + + memchunk_cmdline_override(name, &memsize); + if (!memsize) + return 0; + + buf = dma_alloc_coherent(NULL, memsize, &dma_handle, GFP_KERNEL); + if (!buf) { + pr_warning("%s: unable to allocate memory\n", name); + return -ENOMEM; + } + + memset(buf, 0, memsize); + + r->flags = IORESOURCE_MEM; + r->start = dma_handle; + r->end = r->start + memsize - 1; + r->name = name; + return 0; +} -- cgit 1.2.3-korg