kernel/drivers/staging/android/ion/ion_dummy_driver.c

   1 /*
   2  * drivers/gpu/ion/ion_dummy_driver.c
   3  *
   4  * Copyright (C) 2013 Linaro, Inc
   5  *
   6  * This software is licensed under the terms of the GNU General Public
   7  * License version 2, as published by the Free Software Foundation, and
   8  * may be copied, distributed, and modified under those terms.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  */
  16
  17 #include <linux/err.h>
  18 #include <linux/platform_device.h>
  19 #include <linux/slab.h>
  20 #include <linux/init.h>
  21 #include <linux/bootmem.h>
  22 #include <linux/memblock.h>
  23 #include <linux/sizes.h>
  24 #include <linux/io.h>
  25 #include "ion.h"
  26 #include "ion_priv.h"
  27
  28 static struct ion_device *idev;
  29 static struct ion_heap **heaps;
  30
  31 static void *carveout_ptr;
  32 static void *chunk_ptr;
  33
  34 static struct ion_platform_heap dummy_heaps[] = {
  35                 {
  36                         .id     = ION_HEAP_TYPE_SYSTEM,
  37                         .type   = ION_HEAP_TYPE_SYSTEM,
  38                         .name   = "system",
  39                 },
  40                 {
  41                         .id     = ION_HEAP_TYPE_SYSTEM_CONTIG,
  42                         .type   = ION_HEAP_TYPE_SYSTEM_CONTIG,
  43                         .name   = "system contig",
  44                 },
  45                 {
  46                         .id     = ION_HEAP_TYPE_CARVEOUT,
  47                         .type   = ION_HEAP_TYPE_CARVEOUT,
  48                         .name   = "carveout",
  49                         .size   = SZ_4M,
  50                 },
  51                 {
  52                         .id     = ION_HEAP_TYPE_CHUNK,
  53                         .type   = ION_HEAP_TYPE_CHUNK,
  54                         .name   = "chunk",
  55                         .size   = SZ_4M,
  56                         .align  = SZ_16K,
  57                         .priv   = (void *)(SZ_16K),
  58                 },
  59 };
  60
  61 static struct ion_platform_data dummy_ion_pdata = {
  62         .nr = ARRAY_SIZE(dummy_heaps),
  63         .heaps = dummy_heaps,
  64 };
  65
  66 static int __init ion_dummy_init(void)
  67 {
  68         int i, err;
  69
  70         idev = ion_device_create(NULL);
  71         heaps = kcalloc(dummy_ion_pdata.nr, sizeof(struct ion_heap *),
  72                         GFP_KERNEL);
  73         if (!heaps)
  74                 return -ENOMEM;
  75
  76
  77         /* Allocate a dummy carveout heap */
  78         carveout_ptr = alloc_pages_exact(
  79                                 dummy_heaps[ION_HEAP_TYPE_CARVEOUT].size,
  80                                 GFP_KERNEL);
  81         if (carveout_ptr)
  82                 dummy_heaps[ION_HEAP_TYPE_CARVEOUT].base =
  83                                                 virt_to_phys(carveout_ptr);
  84         else
  85                 pr_err("ion_dummy: Could not allocate carveout\n");
  86
  87         /* Allocate a dummy chunk heap */
  88         chunk_ptr = alloc_pages_exact(
  89                                 dummy_heaps[ION_HEAP_TYPE_CHUNK].size,
  90                                 GFP_KERNEL);
  91         if (chunk_ptr)
  92                 dummy_heaps[ION_HEAP_TYPE_CHUNK].base = virt_to_phys(chunk_ptr);
  93         else
  94                 pr_err("ion_dummy: Could not allocate chunk\n");
  95
  96         for (i = 0; i < dummy_ion_pdata.nr; i++) {
  97                 struct ion_platform_heap *heap_data = &dummy_ion_pdata.heaps[i];
  98
  99                 if (heap_data->type == ION_HEAP_TYPE_CARVEOUT &&
 100                                                         !heap_data->base)
 101                         continue;
 102
 103                 if (heap_data->type == ION_HEAP_TYPE_CHUNK && !heap_data->base)
 104                         continue;
 105
 106                 heaps[i] = ion_heap_create(heap_data);
 107                 if (IS_ERR_OR_NULL(heaps[i])) {
 108                         err = PTR_ERR(heaps[i]);
 109                         goto err;
 110                 }
 111                 ion_device_add_heap(idev, heaps[i]);
 112         }
 113         return 0;
 114 err:
 115         for (i = 0; i < dummy_ion_pdata.nr; ++i)
 116                 ion_heap_destroy(heaps[i]);
 117         kfree(heaps);
 118
 119         if (carveout_ptr) {
 120                 free_pages_exact(carveout_ptr,
 121                                 dummy_heaps[ION_HEAP_TYPE_CARVEOUT].size);
 122                 carveout_ptr = NULL;
 123         }
 124         if (chunk_ptr) {
 125                 free_pages_exact(chunk_ptr,
 126                                 dummy_heaps[ION_HEAP_TYPE_CHUNK].size);
 127                 chunk_ptr = NULL;
 128         }
 129         return err;
 130 }
 131 device_initcall(ion_dummy_init);
 132
 133 static void __exit ion_dummy_exit(void)
 134 {
 135         int i;
 136
 137         ion_device_destroy(idev);
 138
 139         for (i = 0; i < dummy_ion_pdata.nr; i++)
 140                 ion_heap_destroy(heaps[i]);
 141         kfree(heaps);
 142
 143         if (carveout_ptr) {
 144                 free_pages_exact(carveout_ptr,
 145                                 dummy_heaps[ION_HEAP_TYPE_CARVEOUT].size);
 146                 carveout_ptr = NULL;
 147         }
 148         if (chunk_ptr) {
 149                 free_pages_exact(chunk_ptr,
 150                                 dummy_heaps[ION_HEAP_TYPE_CHUNK].size);
 151                 chunk_ptr = NULL;
 152         }
 153 }
 154 __exitcall(ion_dummy_exit);