projects / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| def85743 KB |
1 | #include <linux/device.h> |
| 2 | #include <linux/dma-map-ops.h> | |
| 3 | #include <linux/dma-mapping.h> | |
| 4 | #include <linux/dmapool.h> | |
| 5 | #include <linux/kernel.h> | |
| 6 | #include <linux/ktime.h> | |
| 7 | #include <linux/module.h> | |
| 8 | ||
| 9 | #define NR_TESTS (100) | |
| 10 | ||
| 11 | struct dma_pool_pair { | |
| 12 | dma_addr_t dma; | |
| 13 | void *v; | |
| 14 | }; | |
| 15 | ||
| 16 | struct dmapool_parms { | |
| 17 | size_t size; | |
| 18 | size_t align; | |
| 19 | size_t boundary; | |
| 20 | }; | |
| 21 | ||
| 22 | static const struct dmapool_parms pool_parms[] = { | |
| 23 | { .size = 16, .align = 16, .boundary = 0 }, | |
| 24 | { .size = 64, .align = 64, .boundary = 0 }, | |
| 25 | { .size = 256, .align = 256, .boundary = 0 }, | |
| 26 | { .size = 1024, .align = 1024, .boundary = 0 }, | |
| 27 | { .size = 4096, .align = 4096, .boundary = 0 }, | |
| 28 | { .size = 68, .align = 32, .boundary = 4096 }, | |
| 29 | }; | |
| 30 | ||
| 31 | static struct dma_pool *pool; | |
| 32 | static struct device test_dev; | |
| 33 | static u64 dma_mask; | |
| 34 | ||
| 35 | static inline int nr_blocks(int size) | |
| 36 | { | |
| 37 | return clamp_t(int, (PAGE_SIZE / size) * 512, 1024, 8192); | |
| 38 | } | |
| 39 | ||
| 40 | static int dmapool_test_alloc(struct dma_pool_pair *p, int blocks) | |
| 41 | { | |
| 42 | int i; | |
| 43 | ||
| 44 | for (i = 0; i < blocks; i++) { | |
| 45 | p[i].v = dma_pool_alloc(pool, GFP_KERNEL, | |
| 46 | &p[i].dma); | |
| 47 | if (!p[i].v) | |
| 48 | goto pool_fail; | |
| 49 | } | |
| 50 | ||
| 51 | for (i = 0; i < blocks; i++) | |
| 52 | dma_pool_free(pool, p[i].v, p[i].dma); | |
| 53 | ||
| 54 | return 0; | |
| 55 | ||
| 56 | pool_fail: | |
| 57 | for (--i; i >= 0; i--) | |
| 58 | dma_pool_free(pool, p[i].v, p[i].dma); | |
| 59 | return -ENOMEM; | |
| 60 | } | |
| 61 | ||
| 62 | static int dmapool_test_block(const struct dmapool_parms *parms) | |
| 63 | { | |
| 64 | int blocks = nr_blocks(parms->size); | |
| 65 | ktime_t start_time, end_time; | |
| 66 | struct dma_pool_pair *p; | |
| 67 | int i, ret; | |
| 68 | ||
| 69 | p = kcalloc(blocks, sizeof(*p), GFP_KERNEL); | |
| 70 | if (!p) | |
| 71 | return -ENOMEM; | |
| 72 | ||
| 73 | pool = dma_pool_create("test pool", &test_dev, parms->size, | |
| 74 | parms->align, parms->boundary); | |
| 75 | if (!pool) { | |
| 76 | ret = -ENOMEM; | |
| 77 | goto free_pairs; | |
| 78 | } | |
| 79 | ||
| 80 | start_time = ktime_get(); | |
| 81 | for (i = 0; i < NR_TESTS; i++) { | |
| 82 | ret = dmapool_test_alloc(p, blocks); | |
| 83 | if (ret) | |
| 84 | goto free_pool; | |
| 85 | if (need_resched()) | |
| 86 | cond_resched(); | |
| 87 | } | |
| 88 | end_time = ktime_get(); | |
| 89 | ||
| 90 | printk("dmapool test: size:%-4zu align:%-4zu blocks:%-4d time:%llu\n", | |
| 91 | parms->size, parms->align, blocks, | |
| 92 | ktime_us_delta(end_time, start_time)); | |
| 93 | ||
| 94 | free_pool: | |
| 95 | dma_pool_destroy(pool); | |
| 96 | free_pairs: | |
| 97 | kfree(p); | |
| 98 | return ret; | |
| 99 | } | |
| 100 | ||
| 101 | static void dmapool_test_release(struct device *dev) | |
| 102 | { | |
| 103 | } | |
| 104 | ||
| 105 | static int dmapool_checks(void) | |
| 106 | { | |
| 107 | int i, ret; | |
| 108 | ||
| 109 | ret = dev_set_name(&test_dev, "dmapool-test"); | |
| 110 | if (ret) | |
| 111 | return ret; | |
| 112 | ||
| 113 | ret = device_register(&test_dev); | |
| 114 | if (ret) { | |
| 115 | printk("%s: register failed:%d\n", __func__, ret); | |
| 116 | goto put_device; | |
| 117 | } | |
| 118 | ||
| 119 | test_dev.release = dmapool_test_release; | |
| 120 | set_dma_ops(&test_dev, NULL); | |
| 121 | test_dev.dma_mask = &dma_mask; | |
| 122 | ret = dma_set_mask_and_coherent(&test_dev, DMA_BIT_MASK(64)); | |
| 123 | if (ret) { | |
| 124 | printk("%s: mask failed:%d\n", __func__, ret); | |
| 125 | goto del_device; | |
| 126 | } | |
| 127 | ||
| 128 | for (i = 0; i < ARRAY_SIZE(pool_parms); i++) { | |
| 129 | ret = dmapool_test_block(&pool_parms[i]); | |
| 130 | if (ret) | |
| 131 | break; | |
| 132 | } | |
| 133 | ||
| 134 | del_device: | |
| 135 | device_del(&test_dev); | |
| 136 | put_device: | |
| 137 | put_device(&test_dev); | |
| 138 | return ret; | |
| 139 | } | |
| 140 | ||
| 141 | static void dmapool_exit(void) | |
| 142 | { | |
| 143 | } | |
| 144 | ||
| 145 | module_init(dmapool_checks); | |
| 146 | module_exit(dmapool_exit); | |
| 147 | MODULE_LICENSE("GPL"); |