1 /* 2 * Copyright (C) 2017 Etnaviv Project 3 * 4 * This program is free software; you can redistribute it and/or modify it 5 * under the terms of the GNU General Public License version 2 as published by 6 * the Free Software Foundation. 7 * 8 * This program is distributed in the hope that it will be useful, but WITHOUT 9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 11 * more details. 12 * 13 * You should have received a copy of the GNU General Public License along with 14 * this program. If not, see <http://www.gnu.org/licenses/>. 15 */ 16 17 #include <drm/drm_mm.h> 18 19 #include "etnaviv_cmdbuf.h" 20 #include "etnaviv_gpu.h" 21 #include "etnaviv_mmu.h" 22 #include "etnaviv_perfmon.h" 23 24 #define SUBALLOC_SIZE SZ_256K 25 #define SUBALLOC_GRANULE SZ_4K 26 #define SUBALLOC_GRANULES (SUBALLOC_SIZE / SUBALLOC_GRANULE) 27 28 struct etnaviv_cmdbuf_suballoc { 29 /* suballocated dma buffer properties */ 30 struct etnaviv_gpu *gpu; 31 void *vaddr; 32 dma_addr_t paddr; 33 34 /* GPU mapping */ 35 u32 iova; 36 struct drm_mm_node vram_node; /* only used on MMUv2 */ 37 38 /* allocation management */ 39 struct mutex lock; 40 DECLARE_BITMAP(granule_map, SUBALLOC_GRANULES); 41 int free_space; 42 wait_queue_head_t free_event; 43 }; 44 45 struct etnaviv_cmdbuf_suballoc * 46 etnaviv_cmdbuf_suballoc_new(struct etnaviv_gpu * gpu) 47 { 48 struct etnaviv_cmdbuf_suballoc *suballoc; 49 int ret; 50 51 suballoc = kzalloc(sizeof(*suballoc), GFP_KERNEL); 52 if (!suballoc) 53 return ERR_PTR(-ENOMEM); 54 55 suballoc->gpu = gpu; 56 mutex_init(&suballoc->lock); 57 init_waitqueue_head(&suballoc->free_event); 58 59 suballoc->vaddr = dma_alloc_wc(gpu->dev, SUBALLOC_SIZE, 60 &suballoc->paddr, GFP_KERNEL); 61 if (!suballoc->vaddr) 62 goto free_suballoc; 63 64 ret = etnaviv_iommu_get_suballoc_va(gpu, suballoc->paddr, 65 &suballoc->vram_node, SUBALLOC_SIZE, 66 &suballoc->iova); 67 if (ret) 68 goto free_dma; 69 70 return suballoc; 71 72 free_dma: 73 dma_free_wc(gpu->dev, SUBALLOC_SIZE, suballoc->vaddr, suballoc->paddr); 74 free_suballoc: 75 kfree(suballoc); 76 77 return NULL; 78 } 79 80 void etnaviv_cmdbuf_suballoc_destroy(struct etnaviv_cmdbuf_suballoc *suballoc) 81 { 82 etnaviv_iommu_put_suballoc_va(suballoc->gpu, &suballoc->vram_node, 83 SUBALLOC_SIZE, suballoc->iova); 84 dma_free_wc(suballoc->gpu->dev, SUBALLOC_SIZE, suballoc->vaddr, 85 suballoc->paddr); 86 kfree(suballoc); 87 } 88 89 int etnaviv_cmdbuf_init(struct etnaviv_cmdbuf_suballoc *suballoc, 90 struct etnaviv_cmdbuf *cmdbuf, u32 size) 91 { 92 int granule_offs, order, ret; 93 94 cmdbuf->suballoc = suballoc; 95 cmdbuf->size = size; 96 97 order = order_base_2(ALIGN(size, SUBALLOC_GRANULE) / SUBALLOC_GRANULE); 98 retry: 99 mutex_lock(&suballoc->lock); 100 granule_offs = bitmap_find_free_region(suballoc->granule_map, 101 SUBALLOC_GRANULES, order); 102 if (granule_offs < 0) { 103 suballoc->free_space = 0; 104 mutex_unlock(&suballoc->lock); 105 ret = wait_event_interruptible_timeout(suballoc->free_event, 106 suballoc->free_space, 107 msecs_to_jiffies(10 * 1000)); 108 if (!ret) { 109 dev_err(suballoc->gpu->dev, 110 "Timeout waiting for cmdbuf space\n"); 111 return -ETIMEDOUT; 112 } 113 goto retry; 114 } 115 mutex_unlock(&suballoc->lock); 116 cmdbuf->suballoc_offset = granule_offs * SUBALLOC_GRANULE; 117 cmdbuf->vaddr = suballoc->vaddr + cmdbuf->suballoc_offset; 118 119 return 0; 120 } 121 122 void etnaviv_cmdbuf_free(struct etnaviv_cmdbuf *cmdbuf) 123 { 124 struct etnaviv_cmdbuf_suballoc *suballoc = cmdbuf->suballoc; 125 int order = order_base_2(ALIGN(cmdbuf->size, SUBALLOC_GRANULE) / 126 SUBALLOC_GRANULE); 127 128 mutex_lock(&suballoc->lock); 129 bitmap_release_region(suballoc->granule_map, 130 cmdbuf->suballoc_offset / SUBALLOC_GRANULE, 131 order); 132 suballoc->free_space = 1; 133 mutex_unlock(&suballoc->lock); 134 wake_up_all(&suballoc->free_event); 135 } 136 137 u32 etnaviv_cmdbuf_get_va(struct etnaviv_cmdbuf *buf) 138 { 139 return buf->suballoc->iova + buf->suballoc_offset; 140 } 141 142 dma_addr_t etnaviv_cmdbuf_get_pa(struct etnaviv_cmdbuf *buf) 143 { 144 return buf->suballoc->paddr + buf->suballoc_offset; 145 } 146