drivers/gpu/drm/etnaviv/etnaviv_cmdbuf.c

   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 }