/*
* include/linux/ion.h
*
* Copyright (C) 2011 Google, Inc.
* Copyright (c) 2011-2012, The Linux Foundation. All rights reserved.
*
* 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/ioctl.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_HEAP_TYPE_IOMMU: IOMMU memory
* @ION_HEAP_TYPE_CP: memory allocated from a prereserved
* carveout heap, allocations are physically
* contiguous. Used for content protection.
* @ION_HEAP_TYPE_DMA: memory allocated via DMA API
* @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_DMA,
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)
#define ION_HEAP_TYPE_DMA_MASK (1 << ION_HEAP_TYPE_DMA)
/**
* 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 */
#ifdef __KERNEL__
#include <linux/err.h>
#include <mach/ion.h>
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
#define ion_virt_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
* @memory_type:Memory type used for the heap
* @has_outer_cache: set to 1 if outer cache is used, 0 otherwise.
* @extra_data: Extra data specific to each heap type
* @priv: heap private data
*/
struct ion_platform_heap {
enum ion_heap_type type;
unsigned int id;
const char *name;
ion_phys_addr_t base;
size_t size;
enum ion_memory_types memory_type;
unsigned int has_outer_cache;
void *extra_data;
void *priv;
};
/**
* struct ion_platform_data - array of platform heaps passed from board file
* @has_outer_cache: set to 1 if outer cache is used, 0 otherwise.
* @nr: number of structures in the array
* @request_region: function to be called when the number of allocations goes
* from 0 -> 1
* @release_region: function to be called when the number of allocations goes
* from 1 -> 0
* @setup_region: function to be called upon ion registration
* @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 {
unsigned int has_outer_cache;
int nr;
int (*request_region)(void *);
int (*release_region)(void *);
void *(*setup_region)(void);
struct ion_platform_heap *heaps;
};
#ifdef CONFIG_ION
/**
* 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);
/**
* msm_ion_client_create - allocate a client using the ion_device specified in
* drivers/gpu/ion/msm/msm_ion.c
*
* heap_mask and name are the same as ion_client_create, return values
* are the same as ion_client_create.
*/
struct ion_client *msm_ion_client_create(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
* @flags: flags for this mapping
*
* Map the given handle into the kernel and return a kernel address that
* can be used to access this address. If no flags are specified, this
* will return a non-secure uncached mapping.
*/
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);
/**
* ion_handle_get_flags - get the flags for a given handle
*
* @client - client who allocated the handle
* @handle - handle to get the flags
* @flags - pointer to store the flags
*
* Gets the current flags for a handle. These flags indicate various options
* of the buffer (caching, security, etc.)
*/
int ion_handle_get_flags(struct ion_client *client, struct ion_handle *handle,
unsigned long *flags);
/**
* ion_map_iommu - map the given handle into an iommu
*
* @client - client who allocated the handle
* @handle - handle to map
* @domain_num - domain number to map to
* @partition_num - partition number to allocate iova from
* @align - alignment for the iova
* @iova_length - length of iova to map. If the iova length is
* greater than the handle length, the remaining
* address space will be mapped to a dummy buffer.
* @iova - pointer to store the iova address
* @buffer_size - pointer to store the size of the buffer
* @flags - flags for options to map
* @iommu_flags - flags specific to the iommu.
*
* Maps the handle into the iova space specified via domain number. Iova
* will be allocated from the partition specified via partition_num.
* Returns 0 on success, negative value on error.
*/
int ion_map_iommu(struct ion_client *client, struct ion_handle *handle,
int domain_num, int partition_num, unsigned long align,
unsigned long iova_length, unsigned long *iova,
unsigned long *buffer_size,
unsigned long flags, unsigned long iommu_flags);
/**
* ion_handle_get_size - get the allocated size of a given handle
*
* @client - client who allocated the handle
* @handle - handle to get the size
* @size - pointer to store the size
*
* gives the allocated size of a handle. returns 0 on success, negative
* value on error
*
* NOTE: This is intended to be used only to get a size to pass to map_iommu.
* You should *NOT* rely on this for any other usage.
*/
int ion_handle_get_size(struct ion_client *client, struct ion_handle *handle,
unsigned long *size);
/**
* ion_unmap_iommu - unmap the handle from an iommu
*
* @client - client who allocated the handle
* @handle - handle to unmap
* @domain_num - domain to unmap from
* @partition_num - partition to unmap from
*
* Decrement the reference count on the iommu mapping. If the count is
* 0, the mapping will be removed from the iommu.
*/
void ion_unmap_iommu(struct ion_client *client, struct ion_handle *handle,
int domain_num, int partition_num);
/**
* ion_secure_heap - secure a heap
*
* @client - a client that has allocated from the heap heap_id
* @heap_id - heap id to secure.
* @version - version of content protection
* @data - extra data needed for protection
*
* Secure a heap
* Returns 0 on success
*/
int ion_secure_heap(struct ion_device *dev, int heap_id, int version,
void *data);
/**
* ion_unsecure_heap - un-secure a heap
*
* @client - a client that has allocated from the heap heap_id
* @heap_id - heap id to un-secure.
* @version - version of content protection
* @data - extra data needed for protection
*
* Un-secure a heap
* Returns 0 on success
*/
int ion_unsecure_heap(struct ion_device *dev, int heap_id, int version,
void *data);
/**
* msm_ion_do_cache_op - do cache operations.
*
* @client - pointer to ION client.
* @handle - pointer to buffer handle.
* @vaddr - virtual address to operate on.
* @len - Length of data to do cache operation on.
* @cmd - Cache operation to perform:
* ION_IOC_CLEAN_CACHES
* ION_IOC_INV_CACHES
* ION_IOC_CLEAN_INV_CACHES
*
* Returns 0 on success
*/
int msm_ion_do_cache_op(struct ion_client *client, struct ion_handle *handle,
void *vaddr, unsigned long len, unsigned int cmd);
#else
static inline void ion_reserve(struct ion_platform_data *data)
{
}
static inline struct ion_client *ion_client_create(struct ion_device *dev,
unsigned int heap_mask, const char *name)
{
return ERR_PTR(-ENODEV);
}
static inline struct ion_client *msm_ion_client_create(unsigned int heap_mask,
const char *name)
{
return ERR_PTR(-ENODEV);
}
static inline void ion_client_destroy(struct ion_client *client) { }
static inline struct ion_handle *ion_alloc(struct ion_client *client,
size_t len, size_t align,
unsigned int heap_mask,
unsigned int flags)
{
return ERR_PTR(-ENODEV);
}
static inline void ion_free(struct ion_client *client,
struct ion_handle *handle) { }
static inline int ion_phys(struct ion_client *client,
struct ion_handle *handle, ion_phys_addr_t *addr, size_t *len)
{
return -ENODEV;
}
static inline struct sg_table *ion_sg_table(struct ion_client *client,
struct ion_handle *handle)
{
return ERR_PTR(-ENODEV);
}
static inline void *ion_map_kernel(struct ion_client *client,
struct ion_handle *handle, unsigned long flags)
{
return ERR_PTR(-ENODEV);
}
static inline void ion_unmap_kernel(struct ion_client *client,
struct ion_handle *handle) { }
static inline int ion_share_dma_buf(struct ion_client *client, struct ion_handle *handle)
{
return -ENODEV;
}
static inline struct ion_handle *ion_import_dma_buf(struct ion_client *client, int fd)
{
return ERR_PTR(-ENODEV);
}
static inline int ion_handle_get_flags(struct ion_client *client,
struct ion_handle *handle, unsigned long *flags)
{
return -ENODEV;
}
static inline int ion_map_iommu(struct ion_client *client,
struct ion_handle *handle, int domain_num,
int partition_num, unsigned long align,
unsigned long iova_length, unsigned long *iova,
unsigned long *buffer_size,
unsigned long flags,
unsigned long iommu_flags)
{
return -ENODEV;
}
static inline void ion_unmap_iommu(struct ion_client *client,
struct ion_handle *handle, int domain_num,
int partition_num)
{
return;
}
static inline int ion_secure_heap(struct ion_device *dev, int heap_id,
int version, void *data)
{
return -ENODEV;
}
static inline int ion_unsecure_heap(struct ion_device *dev, int heap_id,
int version, void *data)
{
return -ENODEV;
}
static inline int msm_ion_do_cache_op(struct ion_client *client,
struct ion_handle *handle, void *vaddr,
unsigned long len, unsigned int cmd)
{
return -ENODEV;
}
#endif /* CONFIG_ION */
#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_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)
/**
* 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)
#endif /* _LINUX_ION_H */