projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
1 | /* Fallback functions when the main IOMMU code is not compiled in. This |
| 2 | code is roughly equivalent to i386. */ | |
| 3 | #include <linux/mm.h> | |
| 4 | #include <linux/init.h> | |
| 5 | #include <linux/pci.h> | |
| 6 | #include <linux/string.h> | |
| 7 | #include <asm/proto.h> | |
| 8 | #include <asm/processor.h> | |
| 9 | ||
| 10 | int iommu_merge = 0; | |
| 11 | EXPORT_SYMBOL(iommu_merge); | |
| 12 | ||
| 13 | dma_addr_t bad_dma_address; | |
| 14 | EXPORT_SYMBOL(bad_dma_address); | |
| 15 | ||
| 16 | int iommu_bio_merge = 0; | |
| 17 | EXPORT_SYMBOL(iommu_bio_merge); | |
| 18 | ||
| 19 | int iommu_sac_force = 0; | |
| 20 | EXPORT_SYMBOL(iommu_sac_force); | |
| 21 | ||
| 22 | /* | |
| 23 | * Dummy IO MMU functions | |
| 24 | */ | |
| 25 | ||
| 26 | void *dma_alloc_coherent(struct device *hwdev, size_t size, | |
| f80aabb0 | 27 | dma_addr_t *dma_handle, gfp_t gfp) |
| 1da177e4 LT |
28 | { |
| 29 | void *ret; | |
| 30 | u64 mask; | |
| 31 | int order = get_order(size); | |
| 32 | ||
| 33 | if (hwdev) | |
| 34 | mask = hwdev->coherent_dma_mask & *hwdev->dma_mask; | |
| 35 | else | |
| 36 | mask = 0xffffffff; | |
| 37 | for (;;) { | |
| 38 | ret = (void *)__get_free_pages(gfp, order); | |
| 39 | if (ret == NULL) | |
| 40 | return NULL; | |
| 41 | *dma_handle = virt_to_bus(ret); | |
| 42 | if ((*dma_handle & ~mask) == 0) | |
| 43 | break; | |
| 44 | free_pages((unsigned long)ret, order); | |
| 45 | if (gfp & GFP_DMA) | |
| 46 | return NULL; | |
| 47 | gfp |= GFP_DMA; | |
| 48 | } | |
| 49 | ||
| 50 | memset(ret, 0, size); | |
| 51 | return ret; | |
| 52 | } | |
| 53 | EXPORT_SYMBOL(dma_alloc_coherent); | |
| 54 | ||
| 55 | void dma_free_coherent(struct device *hwdev, size_t size, | |
| 56 | void *vaddr, dma_addr_t dma_handle) | |
| 57 | { | |
| 58 | free_pages((unsigned long)vaddr, get_order(size)); | |
| 59 | } | |
| 60 | EXPORT_SYMBOL(dma_free_coherent); | |
| 61 | ||
| 62 | int dma_supported(struct device *hwdev, u64 mask) | |
| 63 | { | |
| 64 | /* | |
| 65 | * we fall back to GFP_DMA when the mask isn't all 1s, | |
| 66 | * so we can't guarantee allocations that must be | |
| 67 | * within a tighter range than GFP_DMA.. | |
| 68 | * RED-PEN this won't work for pci_map_single. Caller has to | |
| 69 | * use GFP_DMA in the first place. | |
| 70 | */ | |
| 71 | if (mask < 0x00ffffff) | |
| 72 | return 0; | |
| 73 | ||
| 74 | return 1; | |
| 75 | } | |
| 76 | EXPORT_SYMBOL(dma_supported); | |
| 77 | ||
| 78 | int dma_get_cache_alignment(void) | |
| 79 | { | |
| 80 | return boot_cpu_data.x86_clflush_size; | |
| 81 | } | |
| 82 | EXPORT_SYMBOL(dma_get_cache_alignment); | |
| 83 | ||
| 84 | static int __init check_ram(void) | |
| 85 | { | |
| 86 | if (end_pfn >= 0xffffffff>>PAGE_SHIFT) { | |
| 87 | printk( | |
| 88 | KERN_ERR "WARNING more than 4GB of memory but IOMMU not compiled in.\n" | |
| 89 | KERN_ERR "WARNING 32bit PCI may malfunction.\n"); | |
| 90 | } | |
| 91 | return 0; | |
| 92 | } | |
| 93 | __initcall(check_ram); | |
| 94 |