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tee: flexible shared memory pool creation

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Makes creation of shm pools more flexible by adding new more primitive
functions to allocate a shm pool. This makes it easier to add driver
specific shm pool management.

Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>
Signed-off-by: Volodymyr Babchuk <vlad.babchuk@gmail.com>
This commit is contained in:
Jens Wiklander
2017-11-29 14:48:25 +02:00
parent 50c4c4e268
commit e2aca5d892
4 changed files with 200 additions and 123 deletions
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91
include/linux/tee_drv.h
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@@ -149,6 +149,97 @@ int tee_device_register(struct tee_device *teedev);
*/
void tee_device_unregister(struct tee_device *teedev);
/**
* struct tee_shm - shared memory object
* @teedev: device used to allocate the object
* @ctx: context using the object, if NULL the context is gone
* @link link element
* @paddr: physical address of the shared memory
* @kaddr: virtual address of the shared memory
* @size: size of shared memory
* @offset: offset of buffer in user space
* @pages: locked pages from userspace
* @num_pages: number of locked pages
* @dmabuf: dmabuf used to for exporting to user space
* @flags: defined by TEE_SHM_* in tee_drv.h
* @id: unique id of a shared memory object on this device
*
* This pool is only supposed to be accessed directly from the TEE
* subsystem and from drivers that implements their own shm pool manager.
*/
struct tee_shm {
struct tee_device *teedev;
struct tee_context *ctx;
struct list_head link;
phys_addr_t paddr;
void *kaddr;
size_t size;
unsigned int offset;
struct page **pages;
size_t num_pages;
struct dma_buf *dmabuf;
u32 flags;
int id;
};
/**
* struct tee_shm_pool_mgr - shared memory manager
* @ops: operations
* @private_data: private data for the shared memory manager
*/
struct tee_shm_pool_mgr {
const struct tee_shm_pool_mgr_ops *ops;
void *private_data;
};
/**
* struct tee_shm_pool_mgr_ops - shared memory pool manager operations
* @alloc: called when allocating shared memory
* @free: called when freeing shared memory
* @destroy_poolmgr: called when destroying the pool manager
*/
struct tee_shm_pool_mgr_ops {
int (*alloc)(struct tee_shm_pool_mgr *poolmgr, struct tee_shm *shm,
size_t size);
void (*free)(struct tee_shm_pool_mgr *poolmgr, struct tee_shm *shm);
void (*destroy_poolmgr)(struct tee_shm_pool_mgr *poolmgr);
};
/**
* tee_shm_pool_alloc() - Create a shared memory pool from shm managers
* @priv_mgr: manager for driver private shared memory allocations
* @dmabuf_mgr: manager for dma-buf shared memory allocations
*
* Allocation with the flag TEE_SHM_DMA_BUF set will use the range supplied
* in @dmabuf, others will use the range provided by @priv.
*
* @returns pointer to a 'struct tee_shm_pool' or an ERR_PTR on failure.
*/
struct tee_shm_pool *tee_shm_pool_alloc(struct tee_shm_pool_mgr *priv_mgr,
struct tee_shm_pool_mgr *dmabuf_mgr);
/*
* tee_shm_pool_mgr_alloc_res_mem() - Create a shm manager for reserved
* memory
* @vaddr: Virtual address of start of pool
* @paddr: Physical address of start of pool
* @size: Size in bytes of the pool
*
* @returns pointer to a 'struct tee_shm_pool_mgr' or an ERR_PTR on failure.
*/
struct tee_shm_pool_mgr *tee_shm_pool_mgr_alloc_res_mem(unsigned long vaddr,
phys_addr_t paddr,
size_t size,
int min_alloc_order);
/**
* tee_shm_pool_mgr_destroy() - Free a shared memory manager
*/
static inline void tee_shm_pool_mgr_destroy(struct tee_shm_pool_mgr *poolm)
{
poolm->ops->destroy_poolmgr(poolm);
}
/**
* struct tee_shm_pool_mem_info - holds information needed to create a shared
* memory pool