358 lines
11 KiB
C
358 lines
11 KiB
C
/*
|
|
* include/linux/ion.h
|
|
*
|
|
* Copyright (C) 2011 Google, Inc.
|
|
*
|
|
* This software is licensed under the terms of the GNU General Public
|
|
* License version 2, as published by the Free Software Foundation, and
|
|
* may be copied, distributed, and modified under those terms.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
*/
|
|
|
|
#ifndef _LINUX_ION_H
|
|
#define _LINUX_ION_H
|
|
|
|
#include <linux/types.h>
|
|
|
|
struct ion_handle;
|
|
typedef struct ion_handle *ion_user_handle_t;
|
|
/**
|
|
* enum ion_heap_types - list of all possible types of heaps
|
|
* @ION_HEAP_TYPE_SYSTEM: memory allocated via vmalloc
|
|
* @ION_HEAP_TYPE_SYSTEM_CONTIG: memory allocated via kmalloc
|
|
* @ION_HEAP_TYPE_CARVEOUT: memory allocated from a prereserved
|
|
* carveout heap, allocations are physically
|
|
* contiguous
|
|
* @ION_NUM_HEAPS: helper for iterating over heaps, a bit mask
|
|
* is used to identify the heaps, so only 32
|
|
* total heap types are supported
|
|
*/
|
|
enum ion_heap_type {
|
|
ION_HEAP_TYPE_SYSTEM,
|
|
ION_HEAP_TYPE_SYSTEM_CONTIG,
|
|
ION_HEAP_TYPE_CARVEOUT,
|
|
ION_HEAP_TYPE_CUSTOM, /* must be last so device specific heaps always
|
|
are at the end of this enum */
|
|
ION_NUM_HEAPS = 16,
|
|
};
|
|
|
|
#define ION_HEAP_SYSTEM_MASK (1 << ION_HEAP_TYPE_SYSTEM)
|
|
#define ION_HEAP_SYSTEM_CONTIG_MASK (1 << ION_HEAP_TYPE_SYSTEM_CONTIG)
|
|
#define ION_HEAP_CARVEOUT_MASK (1 << ION_HEAP_TYPE_CARVEOUT)
|
|
|
|
/**
|
|
* heap flags - the lower 16 bits are used by core ion, the upper 16
|
|
* bits are reserved for use by the heaps themselves.
|
|
*/
|
|
#define ION_FLAG_CACHED 1 /* mappings of this buffer should be
|
|
cached, ion will do cache
|
|
maintenance when the buffer is
|
|
mapped for dma */
|
|
#define ION_FLAG_CACHED_NEEDS_SYNC 2 /* mappings of this buffer will created
|
|
at mmap time, if this is set
|
|
caches must be managed manually */
|
|
|
|
#ifdef __KERNEL__
|
|
struct ion_device;
|
|
struct ion_heap;
|
|
struct ion_mapper;
|
|
struct ion_client;
|
|
struct ion_buffer;
|
|
|
|
/* This should be removed some day when phys_addr_t's are fully
|
|
plumbed in the kernel, and all instances of ion_phys_addr_t should
|
|
be converted to phys_addr_t. For the time being many kernel interfaces
|
|
do not accept phys_addr_t's that would have to */
|
|
#define ion_phys_addr_t unsigned long
|
|
|
|
/**
|
|
* struct ion_platform_heap - defines a heap in the given platform
|
|
* @type: type of the heap from ion_heap_type enum
|
|
* @id: unique identifier for heap. When allocating (lower numbers
|
|
* will be allocated from first)
|
|
* @name: used for debug purposes
|
|
* @base: base address of heap in physical memory if applicable
|
|
* @size: size of the heap in bytes if applicable
|
|
*
|
|
* Provided by the board file.
|
|
*/
|
|
struct ion_platform_heap {
|
|
enum ion_heap_type type;
|
|
unsigned int id;
|
|
const char *name;
|
|
ion_phys_addr_t base;
|
|
size_t size;
|
|
};
|
|
|
|
/**
|
|
* struct ion_platform_data - array of platform heaps passed from board file
|
|
* @nr: number of structures in the array
|
|
* @heaps: array of platform_heap structions
|
|
*
|
|
* Provided by the board file in the form of platform data to a platform device.
|
|
*/
|
|
struct ion_platform_data {
|
|
int nr;
|
|
struct ion_platform_heap heaps[];
|
|
};
|
|
|
|
/**
|
|
* ion_reserve() - reserve memory for ion heaps if applicable
|
|
* @data: platform data specifying starting physical address and
|
|
* size
|
|
*
|
|
* Calls memblock reserve to set aside memory for heaps that are
|
|
* located at specific memory addresses or of specfic sizes not
|
|
* managed by the kernel
|
|
*/
|
|
void ion_reserve(struct ion_platform_data *data);
|
|
|
|
/**
|
|
* ion_client_create() - allocate a client and returns it
|
|
* @dev: the global ion device
|
|
* @heap_mask: mask of heaps this client can allocate from
|
|
* @name: used for debugging
|
|
*/
|
|
struct ion_client *ion_client_create(struct ion_device *dev,
|
|
unsigned int heap_mask, const char *name);
|
|
|
|
/**
|
|
* ion_client_destroy() - free's a client and all it's handles
|
|
* @client: the client
|
|
*
|
|
* Free the provided client and all it's resources including
|
|
* any handles it is holding.
|
|
*/
|
|
void ion_client_destroy(struct ion_client *client);
|
|
|
|
/**
|
|
* ion_alloc - allocate ion memory
|
|
* @client: the client
|
|
* @len: size of the allocation
|
|
* @align: requested allocation alignment, lots of hardware blocks have
|
|
* alignment requirements of some kind
|
|
* @heap_mask: mask of heaps to allocate from, if multiple bits are set
|
|
* heaps will be tried in order from lowest to highest order bit
|
|
* @flags: heap flags, the low 16 bits are consumed by ion, the high 16
|
|
* bits are passed on to the respective heap and can be heap
|
|
* custom
|
|
*
|
|
* Allocate memory in one of the heaps provided in heap mask and return
|
|
* an opaque handle to it.
|
|
*/
|
|
struct ion_handle *ion_alloc(struct ion_client *client, size_t len,
|
|
size_t align, unsigned int heap_mask,
|
|
unsigned int flags);
|
|
|
|
/**
|
|
* ion_free - free a handle
|
|
* @client: the client
|
|
* @handle: the handle to free
|
|
*
|
|
* Free the provided handle.
|
|
*/
|
|
void ion_free(struct ion_client *client, struct ion_handle *handle);
|
|
|
|
/**
|
|
* ion_phys - returns the physical address and len of a handle
|
|
* @client: the client
|
|
* @handle: the handle
|
|
* @addr: a pointer to put the address in
|
|
* @len: a pointer to put the length in
|
|
*
|
|
* This function queries the heap for a particular handle to get the
|
|
* handle's physical address. It't output is only correct if
|
|
* a heap returns physically contiguous memory -- in other cases
|
|
* this api should not be implemented -- ion_sg_table should be used
|
|
* instead. Returns -EINVAL if the handle is invalid. This has
|
|
* no implications on the reference counting of the handle --
|
|
* the returned value may not be valid if the caller is not
|
|
* holding a reference.
|
|
*/
|
|
int ion_phys(struct ion_client *client, struct ion_handle *handle,
|
|
ion_phys_addr_t *addr, size_t *len);
|
|
|
|
/**
|
|
* ion_map_dma - return an sg_table describing a handle
|
|
* @client: the client
|
|
* @handle: the handle
|
|
*
|
|
* This function returns the sg_table describing
|
|
* a particular ion handle.
|
|
*/
|
|
struct sg_table *ion_sg_table(struct ion_client *client,
|
|
struct ion_handle *handle);
|
|
|
|
/**
|
|
* ion_map_kernel - create mapping for the given handle
|
|
* @client: the client
|
|
* @handle: handle to map
|
|
*
|
|
* Map the given handle into the kernel and return a kernel address that
|
|
* can be used to access this address.
|
|
*/
|
|
void *ion_map_kernel(struct ion_client *client, struct ion_handle *handle);
|
|
|
|
/**
|
|
* ion_unmap_kernel() - destroy a kernel mapping for a handle
|
|
* @client: the client
|
|
* @handle: handle to unmap
|
|
*/
|
|
void ion_unmap_kernel(struct ion_client *client, struct ion_handle *handle);
|
|
|
|
/**
|
|
* ion_share_dma_buf() - given an ion client, create a dma-buf fd
|
|
* @client: the client
|
|
* @handle: the handle
|
|
*/
|
|
int ion_share_dma_buf(struct ion_client *client, struct ion_handle *handle);
|
|
|
|
/**
|
|
* ion_import_dma_buf() - given an dma-buf fd from the ion exporter get handle
|
|
* @client: the client
|
|
* @fd: the dma-buf fd
|
|
*
|
|
* Given an dma-buf fd that was allocated through ion via ion_share_dma_buf,
|
|
* import that fd and return a handle representing it. If a dma-buf from
|
|
* another exporter is passed in this function will return ERR_PTR(-EINVAL)
|
|
*/
|
|
struct ion_handle *ion_import_dma_buf(struct ion_client *client, int fd);
|
|
|
|
#endif /* __KERNEL__ */
|
|
|
|
/**
|
|
* DOC: Ion Userspace API
|
|
*
|
|
* create a client by opening /dev/ion
|
|
* most operations handled via following ioctls
|
|
*
|
|
*/
|
|
|
|
/**
|
|
* struct ion_allocation_data - metadata passed from userspace for allocations
|
|
* @len: size of the allocation
|
|
* @align: required alignment of the allocation
|
|
* @heap_mask: mask of heaps to allocate from
|
|
* @flags: flags passed to heap
|
|
* @handle: pointer that will be populated with a cookie to use to refer
|
|
* to this allocation
|
|
*
|
|
* Provided by userspace as an argument to the ioctl
|
|
*/
|
|
struct ion_allocation_data {
|
|
size_t len;
|
|
size_t align;
|
|
unsigned int heap_id_mask;
|
|
unsigned int flags;
|
|
ion_user_handle_t handle;
|
|
};
|
|
|
|
/**
|
|
* struct ion_fd_data - metadata passed to/from userspace for a handle/fd pair
|
|
* @handle: a handle
|
|
* @fd: a file descriptor representing that handle
|
|
*
|
|
* For ION_IOC_SHARE or ION_IOC_MAP userspace populates the handle field with
|
|
* the handle returned from ion alloc, and the kernel returns the file
|
|
* descriptor to share or map in the fd field. For ION_IOC_IMPORT, userspace
|
|
* provides the file descriptor and the kernel returns the handle.
|
|
*/
|
|
struct ion_fd_data {
|
|
ion_user_handle_t handle;
|
|
int fd;
|
|
};
|
|
|
|
/**
|
|
* struct ion_handle_data - a handle passed to/from the kernel
|
|
* @handle: a handle
|
|
*/
|
|
struct ion_handle_data {
|
|
ion_user_handle_t handle;
|
|
};
|
|
|
|
/**
|
|
* struct ion_custom_data - metadata passed to/from userspace for a custom ioctl
|
|
* @cmd: the custom ioctl function to call
|
|
* @arg: additional data to pass to the custom ioctl, typically a user
|
|
* pointer to a predefined structure
|
|
*
|
|
* This works just like the regular cmd and arg fields of an ioctl.
|
|
*/
|
|
struct ion_custom_data {
|
|
unsigned int cmd;
|
|
unsigned long arg;
|
|
};
|
|
|
|
#define ION_IOC_MAGIC 'I'
|
|
|
|
/**
|
|
* DOC: ION_IOC_ALLOC - allocate memory
|
|
*
|
|
* Takes an ion_allocation_data struct and returns it with the handle field
|
|
* populated with the opaque handle for the allocation.
|
|
*/
|
|
#define ION_IOC_ALLOC _IOWR(ION_IOC_MAGIC, 0, \
|
|
struct ion_allocation_data)
|
|
|
|
/**
|
|
* DOC: ION_IOC_FREE - free memory
|
|
*
|
|
* Takes an ion_handle_data struct and frees the handle.
|
|
*/
|
|
#define ION_IOC_FREE _IOWR(ION_IOC_MAGIC, 1, struct ion_handle_data)
|
|
|
|
/**
|
|
* DOC: ION_IOC_MAP - get a file descriptor to mmap
|
|
*
|
|
* Takes an ion_fd_data struct with the handle field populated with a valid
|
|
* opaque handle. Returns the struct with the fd field set to a file
|
|
* descriptor open in the current address space. This file descriptor
|
|
* can then be used as an argument to mmap.
|
|
*/
|
|
#define ION_IOC_MAP _IOWR(ION_IOC_MAGIC, 2, struct ion_fd_data)
|
|
|
|
/**
|
|
* DOC: ION_IOC_SHARE - creates a file descriptor to use to share an allocation
|
|
*
|
|
* Takes an ion_fd_data struct with the handle field populated with a valid
|
|
* opaque handle. Returns the struct with the fd field set to a file
|
|
* descriptor open in the current address space. This file descriptor
|
|
* can then be passed to another process. The corresponding opaque handle can
|
|
* be retrieved via ION_IOC_IMPORT.
|
|
*/
|
|
#define ION_IOC_SHARE _IOWR(ION_IOC_MAGIC, 4, struct ion_fd_data)
|
|
|
|
/**
|
|
* DOC: ION_IOC_IMPORT - imports a shared file descriptor
|
|
*
|
|
* Takes an ion_fd_data struct with the fd field populated with a valid file
|
|
* descriptor obtained from ION_IOC_SHARE and returns the struct with the handle
|
|
* filed set to the corresponding opaque handle.
|
|
*/
|
|
#define ION_IOC_IMPORT _IOWR(ION_IOC_MAGIC, 5, struct ion_fd_data)
|
|
|
|
/**
|
|
* DOC: ION_IOC_SYNC - syncs a shared file descriptors to memory
|
|
*
|
|
* Deprecated in favor of using the dma_buf api's correctly (syncing
|
|
* will happend automatically when the buffer is mapped to a device).
|
|
* If necessary should be used after touching a cached buffer from the cpu,
|
|
* this will make the buffer in memory coherent.
|
|
*/
|
|
#define ION_IOC_SYNC _IOWR(ION_IOC_MAGIC, 7, struct ion_fd_data)
|
|
|
|
/**
|
|
* DOC: ION_IOC_CUSTOM - call architecture specific ion ioctl
|
|
*
|
|
* Takes the argument of the architecture specific ioctl to call and
|
|
* passes appropriate userdata for that ioctl
|
|
*/
|
|
#define ION_IOC_CUSTOM _IOWR(ION_IOC_MAGIC, 6, struct ion_custom_data)
|
|
|
|
#endif /* _LINUX_ION_H */
|