/* session->memory_lock must be held when calling this function */
static void mali_mem_release(mali_mem_allocation *descriptor)
{
MALI_DEBUG_ASSERT_POINTER(descriptor);
MALI_DEBUG_ASSERT_LOCK_HELD(descriptor->session->memory_lock);
MALI_DEBUG_ASSERT(MALI_MEM_ALLOCATION_VALID_MAGIC == descriptor->magic);
switch (descriptor->type) {
case MALI_MEM_OS:
mali_mem_os_release(descriptor);
break;
case MALI_MEM_DMA_BUF:
#if defined(CONFIG_DMA_SHARED_BUFFER)
mali_mem_dma_buf_release(descriptor);
#endif
break;
case MALI_MEM_UMP:
#if defined(CONFIG_MALI400_UMP)
mali_mem_ump_release(descriptor);
#endif
break;
case MALI_MEM_EXTERNAL:
mali_mem_external_release(descriptor);
break;
case MALI_MEM_BLOCK:
mali_mem_block_release(descriptor);
break;
default:
MALI_DEBUG_PRINT(1, ("mem type %d is not in the mali_mem_type enum.\n", descriptor->type));
break;
}
}
/** @note munmap handler is done by vma close handler */
int mali_mmap(struct file *filp, struct vm_area_struct *vma)
{
struct mali_session_data *session;
mali_mem_allocation *descriptor;
u32 size = vma->vm_end - vma->vm_start;
u32 mali_addr = vma->vm_pgoff << PAGE_SHIFT;
session = (struct mali_session_data *)filp->private_data;
if (NULL == session) {
MALI_PRINT_ERROR(("mmap called without any session data available\n"));
return -EFAULT;
}
MALI_DEBUG_PRINT(4, ("MMap() handler: start=0x%08X, phys=0x%08X, size=0x%08X vma->flags 0x%08x\n",
(unsigned int)vma->vm_start, (unsigned int)(vma->vm_pgoff << PAGE_SHIFT),
(unsigned int)(vma->vm_end - vma->vm_start), vma->vm_flags));
/* Set some bits which indicate that, the memory is IO memory, meaning
* that no paging is to be performed and the memory should not be
* included in crash dumps. And that the memory is reserved, meaning
* that it's present and can never be paged out (see also previous
* entry)
*/
vma->vm_flags |= VM_IO;
vma->vm_flags |= VM_DONTCOPY;
vma->vm_flags |= VM_PFNMAP;
#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 7, 0)
vma->vm_flags |= VM_RESERVED;
#else
vma->vm_flags |= VM_DONTDUMP;
vma->vm_flags |= VM_DONTEXPAND;
#endif
vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
vma->vm_ops = &mali_kernel_vm_ops; /* Operations used on any memory system */
descriptor = mali_mem_block_alloc(mali_addr, size, vma, session);
if (NULL == descriptor) {
descriptor = mali_mem_os_alloc(mali_addr, size, vma, session);
if (NULL == descriptor) {
MALI_DEBUG_PRINT(3, ("MMAP failed\n"));
return -ENOMEM;
}
}
MALI_DEBUG_ASSERT(MALI_MEM_ALLOCATION_VALID_MAGIC == descriptor->magic);
vma->vm_private_data = (void *)descriptor;
/* Put on descriptor map */
if (_MALI_OSK_ERR_OK != mali_descriptor_mapping_allocate_mapping(session->descriptor_mapping, descriptor, &descriptor->id)) {
_mali_osk_mutex_wait(session->memory_lock);
mali_mem_os_release(descriptor);
_mali_osk_mutex_signal(session->memory_lock);
return -EFAULT;
}
return 0;
}
