drivers/media/video/samsung/ump/linux/ump_kernel_memory_backend_os.c

   1 /*
   2  * Copyright (C) 2010 ARM Limited. All rights reserved.
   3  *
   4  * This program is free software and is provided to you under the terms of the GNU General Public License version 2
   5  * as published by the Free Software Foundation, and any use by you of this program is subject to the terms of such GNU licence.
   6  *
   7  * A copy of the licence is included with the program, and can also be obtained from Free Software
   8  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
   9  */
  10
  11 /* needed to detect kernel version specific code */
  12 #include <linux/version.h>
  13
  14 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,26)
  15 #include <linux/semaphore.h>
  16 #else /* pre 2.6.26 the file was in the arch specific location */
  17 #include <asm/semaphore.h>
  18 #endif
  19
  20 #include <linux/dma-mapping.h>
  21 #include <linux/mm.h>
  22 #include <linux/slab.h>
  23 #include <asm/atomic.h>
  24 #include <linux/vmalloc.h>
  25 #include <asm/cacheflush.h>
  26 #include "ump_kernel_common.h"
  27 #include "ump_kernel_memory_backend.h"
  28
  29
  30
  31 typedef struct os_allocator
  32 {
  33         struct semaphore mutex;
  34         u32 num_pages_max;       /**< Maximum number of pages to allocate from the OS */
  35         u32 num_pages_allocated; /**< Number of pages allocated from the OS */
  36 } os_allocator;
  37
  38
  39
  40 static void os_free(void* ctx, ump_dd_mem * descriptor);
  41 static int os_allocate(void* ctx, ump_dd_mem * descriptor);
  42 static void os_memory_backend_destroy(ump_memory_backend * backend);
  43 static u32 os_stat(struct ump_memory_backend *backend);
  44
  45
  46
  47 /*
  48  * Create OS memory backend
  49  */
  50 ump_memory_backend * ump_os_memory_backend_create(const int max_allocation)
  51 {
  52         ump_memory_backend * backend;
  53         os_allocator * info;
  54
  55         info = kmalloc(sizeof(os_allocator), GFP_KERNEL);
  56         if (NULL == info)
  57         {
  58                 return NULL;
  59         }
  60
  61         info->num_pages_max = max_allocation >> PAGE_SHIFT;
  62         info->num_pages_allocated = 0;
  63
  64         sema_init(&info->mutex, 1);
  65
  66         backend = kmalloc(sizeof(ump_memory_backend), GFP_KERNEL);
  67         if (NULL == backend)
  68         {
  69                 kfree(info);
  70                 return NULL;
  71         }
  72
  73         backend->ctx = info;
  74         backend->allocate = os_allocate;
  75         backend->release = os_free;
  76         backend->shutdown = os_memory_backend_destroy;
  77         backend->stat = os_stat;
  78         backend->pre_allocate_physical_check = NULL;
  79         backend->adjust_to_mali_phys = NULL;
  80         backend->get = NULL;
  81         backend->set = NULL;
  82
  83         return backend;
  84 }
  85
  86
  87
  88 /*
  89  * Destroy specified OS memory backend
  90  */
  91 static void os_memory_backend_destroy(ump_memory_backend * backend)
  92 {
  93         os_allocator * info = (os_allocator*)backend->ctx;
  94
  95         DBG_MSG_IF(1, 0 != info->num_pages_allocated, ("%d pages still in use during shutdown\n", info->num_pages_allocated));
  96
  97         kfree(info);
  98         kfree(backend);
  99 }
 100
 101
 102
 103 /*
 104  * Allocate UMP memory
 105  */
 106 static int os_allocate(void* ctx, ump_dd_mem * descriptor)
 107 {
 108         u32 left;
 109         os_allocator * info;
 110         int pages_allocated = 0;
 111         int is_cached;
 112
 113         BUG_ON(!descriptor);
 114         BUG_ON(!ctx);
 115
 116         info = (os_allocator*)ctx;
 117         left = descriptor->size_bytes;
 118         is_cached = descriptor->is_cached;
 119
 120         if (down_interruptible(&info->mutex))
 121         {
 122                 DBG_MSG(1, ("Failed to get mutex in os_free\n"));
 123                 return 0; /* failure */
 124         }
 125
 126         descriptor->backend_info = NULL;
 127         descriptor->nr_blocks = ((left + PAGE_SIZE - 1) & ~(PAGE_SIZE - 1)) >> PAGE_SHIFT;
 128
 129         DBG_MSG(5, ("Allocating page array. Size: %lu\n", descriptor->nr_blocks * sizeof(ump_dd_physical_block)));
 130
 131         descriptor->block_array = (ump_dd_physical_block *)vmalloc(sizeof(ump_dd_physical_block) * descriptor->nr_blocks);
 132         if (NULL == descriptor->block_array)
 133         {
 134                 up(&info->mutex);
 135                 DBG_MSG(1, ("Block array could not be allocated\n"));
 136                 return 0; /* failure */
 137         }
 138
 139         while (left > 0 && ((info->num_pages_allocated + pages_allocated) < info->num_pages_max))
 140         {
 141                 struct page * new_page;
 142
 143                 if (is_cached)
 144                 {
 145                         new_page = alloc_page(GFP_KERNEL | __GFP_ZERO | __GFP_NORETRY | __GFP_NOWARN );
 146                 } else
 147                 {
 148                         new_page = alloc_page(GFP_KERNEL | __GFP_ZERO | __GFP_NORETRY | __GFP_NOWARN | __GFP_COLD);
 149                 }
 150                 if (NULL == new_page)
 151                 {
 152                         break;
 153                 }
 154
 155                 /* Ensure page caches are flushed. */
 156                 if ( is_cached )
 157                 {
 158                         descriptor->block_array[pages_allocated].addr = page_to_phys(new_page);
 159                         descriptor->block_array[pages_allocated].size = PAGE_SIZE;
 160                 } else
 161                 {
 162                         descriptor->block_array[pages_allocated].addr = dma_map_page(NULL, new_page, 0, PAGE_SIZE, DMA_BIDIRECTIONAL );
 163                         descriptor->block_array[pages_allocated].size = PAGE_SIZE;
 164                 }
 165
 166                 DBG_MSG(5, ("Allocated page 0x%08lx cached: %d\n", descriptor->block_array[pages_allocated].addr, is_cached));
 167
 168                 if (left < PAGE_SIZE)
 169                 {
 170                         left = 0;
 171                 }
 172                 else
 173                 {
 174                         left -= PAGE_SIZE;
 175                 }
 176
 177                 pages_allocated++;
 178         }
 179
 180         DBG_MSG(5, ("Alloce for ID:%2d got %d pages, cached: %d\n", descriptor->secure_id,  pages_allocated));
 181
 182         if (left)
 183         {
 184                 DBG_MSG(1, ("Failed to allocate needed pages\n"));
 185
 186                 while(pages_allocated)
 187                 {
 188                         pages_allocated--;
 189                         if ( !is_cached )
 190                         {
 191                                 dma_unmap_page(NULL, descriptor->block_array[pages_allocated].addr, PAGE_SIZE, DMA_BIDIRECTIONAL);
 192                         }
 193                         __free_page(pfn_to_page(descriptor->block_array[pages_allocated].addr >> PAGE_SHIFT) );
 194                 }
 195
 196                 up(&info->mutex);
 197
 198                 return 0; /* failure */
 199         }
 200
 201         info->num_pages_allocated += pages_allocated;
 202
 203         DBG_MSG(6, ("%d out of %d pages now allocated\n", info->num_pages_allocated, info->num_pages_max));
 204
 205         up(&info->mutex);
 206
 207         return 1; /* success*/
 208 }
 209
 210
 211 /*
 212  * Free specified UMP memory
 213  */
 214 static void os_free(void* ctx, ump_dd_mem * descriptor)
 215 {
 216         os_allocator * info;
 217         int i;
 218
 219         BUG_ON(!ctx);
 220         BUG_ON(!descriptor);
 221
 222         info = (os_allocator*)ctx;
 223
 224         BUG_ON(descriptor->nr_blocks > info->num_pages_allocated);
 225
 226         if (down_interruptible(&info->mutex))
 227         {
 228                 DBG_MSG(1, ("Failed to get mutex in os_free\n"));
 229                 return;
 230         }
 231
 232         DBG_MSG(5, ("Releasing %lu OS pages\n", descriptor->nr_blocks));
 233
 234         info->num_pages_allocated -= descriptor->nr_blocks;
 235
 236         up(&info->mutex);
 237
 238         for ( i = 0; i < descriptor->nr_blocks; i++)
 239         {
 240                 DBG_MSG(6, ("Freeing physical page. Address: 0x%08lx\n", descriptor->block_array[i].addr));
 241                 if ( ! descriptor->is_cached)
 242                 {
 243                         dma_unmap_page(NULL, descriptor->block_array[i].addr, PAGE_SIZE, DMA_BIDIRECTIONAL);
 244                 }
 245                 __free_page(pfn_to_page(descriptor->block_array[i].addr>>PAGE_SHIFT) );
 246         }
 247
 248         vfree(descriptor->block_array);
 249 }
 250
 251
 252 static u32 os_stat(struct ump_memory_backend *backend)
 253 {
 254         os_allocator *info;
 255         info = (os_allocator*)backend->ctx;
 256         return info->num_pages_allocated * _MALI_OSK_MALI_PAGE_SIZE;
 257 }