151 lines
4.0 KiB
C
151 lines
4.0 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* Copyright (c) Qualcomm Technologies, Inc. and/or its subsidiaries.
|
|
*/
|
|
|
|
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
|
|
|
|
#include <linux/firmware/qcom/qcom_tzmem.h>
|
|
#include <linux/mm.h>
|
|
|
|
#include "qcomtee.h"
|
|
|
|
/**
|
|
* define MAX_OUTBOUND_BUFFER_SIZE - Maximum size of outbound buffers.
|
|
*
|
|
* The size of outbound buffer depends on QTEE callback requests.
|
|
*/
|
|
#define MAX_OUTBOUND_BUFFER_SIZE SZ_4K
|
|
|
|
/**
|
|
* define MAX_INBOUND_BUFFER_SIZE - Maximum size of the inbound buffer.
|
|
*
|
|
* The size of the inbound buffer depends on the user's requests,
|
|
* specifically the number of IB and OB arguments. If an invocation
|
|
* requires a size larger than %MAX_INBOUND_BUFFER_SIZE, the user should
|
|
* consider using another form of shared memory with QTEE.
|
|
*/
|
|
#define MAX_INBOUND_BUFFER_SIZE SZ_4M
|
|
|
|
/**
|
|
* qcomtee_msg_buffers_alloc() - Allocate inbound and outbound buffers.
|
|
* @oic: context to use for the current invocation.
|
|
* @u: array of arguments for the current invocation.
|
|
*
|
|
* It calculates the size of inbound and outbound buffers based on the
|
|
* arguments in @u. It allocates the buffers from the teedev pool.
|
|
*
|
|
* Return: On success, returns 0. On error, returns < 0.
|
|
*/
|
|
int qcomtee_msg_buffers_alloc(struct qcomtee_object_invoke_ctx *oic,
|
|
struct qcomtee_arg *u)
|
|
{
|
|
struct tee_context *ctx = oic->ctx;
|
|
struct tee_shm *shm;
|
|
size_t size;
|
|
int i;
|
|
|
|
/* Start offset in a message for buffer arguments. */
|
|
size = qcomtee_msg_buffer_args(struct qcomtee_msg_object_invoke,
|
|
qcomtee_args_len(u));
|
|
if (size > MAX_INBOUND_BUFFER_SIZE)
|
|
return -EINVAL;
|
|
|
|
/* Add size of IB arguments. */
|
|
qcomtee_arg_for_each_input_buffer(i, u) {
|
|
size = size_add(size, qcomtee_msg_offset_align(u[i].b.size));
|
|
if (size > MAX_INBOUND_BUFFER_SIZE)
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* Add size of OB arguments. */
|
|
qcomtee_arg_for_each_output_buffer(i, u) {
|
|
size = size_add(size, qcomtee_msg_offset_align(u[i].b.size));
|
|
if (size > MAX_INBOUND_BUFFER_SIZE)
|
|
return -EINVAL;
|
|
}
|
|
|
|
shm = tee_shm_alloc_priv_buf(ctx, size);
|
|
if (IS_ERR(shm))
|
|
return PTR_ERR(shm);
|
|
|
|
/* Allocate inbound buffer. */
|
|
oic->in_shm = shm;
|
|
shm = tee_shm_alloc_priv_buf(ctx, MAX_OUTBOUND_BUFFER_SIZE);
|
|
if (IS_ERR(shm)) {
|
|
tee_shm_free(oic->in_shm);
|
|
|
|
return PTR_ERR(shm);
|
|
}
|
|
/* Allocate outbound buffer. */
|
|
oic->out_shm = shm;
|
|
|
|
oic->in_msg.addr = tee_shm_get_va(oic->in_shm, 0);
|
|
oic->in_msg.size = tee_shm_get_size(oic->in_shm);
|
|
oic->out_msg.addr = tee_shm_get_va(oic->out_shm, 0);
|
|
oic->out_msg.size = tee_shm_get_size(oic->out_shm);
|
|
/* QTEE assume unused buffers are zeroed. */
|
|
memzero_explicit(oic->in_msg.addr, oic->in_msg.size);
|
|
memzero_explicit(oic->out_msg.addr, oic->out_msg.size);
|
|
|
|
return 0;
|
|
}
|
|
|
|
void qcomtee_msg_buffers_free(struct qcomtee_object_invoke_ctx *oic)
|
|
{
|
|
tee_shm_free(oic->in_shm);
|
|
tee_shm_free(oic->out_shm);
|
|
}
|
|
|
|
/* Dynamic shared memory pool based on tee_dyn_shm_alloc_helper(). */
|
|
|
|
static int qcomtee_shm_register(struct tee_context *ctx, struct tee_shm *shm,
|
|
struct page **pages, size_t num_pages,
|
|
unsigned long start)
|
|
{
|
|
return qcom_tzmem_shm_bridge_create(shm->paddr, shm->size,
|
|
&shm->sec_world_id);
|
|
}
|
|
|
|
static int qcomtee_shm_unregister(struct tee_context *ctx, struct tee_shm *shm)
|
|
{
|
|
qcom_tzmem_shm_bridge_delete(shm->sec_world_id);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int pool_op_alloc(struct tee_shm_pool *pool, struct tee_shm *shm,
|
|
size_t size, size_t align)
|
|
{
|
|
return tee_dyn_shm_alloc_helper(shm, size, align, qcomtee_shm_register);
|
|
}
|
|
|
|
static void pool_op_free(struct tee_shm_pool *pool, struct tee_shm *shm)
|
|
{
|
|
tee_dyn_shm_free_helper(shm, qcomtee_shm_unregister);
|
|
}
|
|
|
|
static void pool_op_destroy_pool(struct tee_shm_pool *pool)
|
|
{
|
|
kfree(pool);
|
|
}
|
|
|
|
static const struct tee_shm_pool_ops pool_ops = {
|
|
.alloc = pool_op_alloc,
|
|
.free = pool_op_free,
|
|
.destroy_pool = pool_op_destroy_pool,
|
|
};
|
|
|
|
struct tee_shm_pool *qcomtee_shm_pool_alloc(void)
|
|
{
|
|
struct tee_shm_pool *pool;
|
|
|
|
pool = kzalloc(sizeof(*pool), GFP_KERNEL);
|
|
if (!pool)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
pool->ops = &pool_ops;
|
|
|
|
return pool;
|
|
}
|