498 lines
12 KiB
C
498 lines
12 KiB
C
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (c) 2015-2016, Linaro Limited
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*/
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#include <linux/device.h>
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#include <linux/dma-buf.h>
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#include <linux/fdtable.h>
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#include <linux/idr.h>
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include <linux/tee_drv.h>
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#include "tee_private.h"
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static void tee_shm_release(struct tee_shm *shm)
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{
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struct tee_device *teedev = shm->teedev;
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mutex_lock(&teedev->mutex);
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idr_remove(&teedev->idr, shm->id);
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if (shm->ctx)
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list_del(&shm->link);
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mutex_unlock(&teedev->mutex);
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if (shm->flags & TEE_SHM_POOL) {
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struct tee_shm_pool_mgr *poolm;
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if (shm->flags & TEE_SHM_DMA_BUF)
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poolm = teedev->pool->dma_buf_mgr;
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else
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poolm = teedev->pool->private_mgr;
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poolm->ops->free(poolm, shm);
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} else if (shm->flags & TEE_SHM_REGISTER) {
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size_t n;
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int rc = teedev->desc->ops->shm_unregister(shm->ctx, shm);
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if (rc)
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dev_err(teedev->dev.parent,
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"unregister shm %p failed: %d", shm, rc);
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for (n = 0; n < shm->num_pages; n++)
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put_page(shm->pages[n]);
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kfree(shm->pages);
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}
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if (shm->ctx)
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teedev_ctx_put(shm->ctx);
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kfree(shm);
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tee_device_put(teedev);
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}
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static struct sg_table *tee_shm_op_map_dma_buf(struct dma_buf_attachment
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*attach, enum dma_data_direction dir)
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{
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return NULL;
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}
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static void tee_shm_op_unmap_dma_buf(struct dma_buf_attachment *attach,
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struct sg_table *table,
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enum dma_data_direction dir)
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{
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}
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static void tee_shm_op_release(struct dma_buf *dmabuf)
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{
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struct tee_shm *shm = dmabuf->priv;
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tee_shm_release(shm);
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}
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static void *tee_shm_op_map(struct dma_buf *dmabuf, unsigned long pgnum)
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{
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return NULL;
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}
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static int tee_shm_op_mmap(struct dma_buf *dmabuf, struct vm_area_struct *vma)
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{
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struct tee_shm *shm = dmabuf->priv;
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size_t size = vma->vm_end - vma->vm_start;
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/* Refuse sharing shared memory provided by application */
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if (shm->flags & TEE_SHM_REGISTER)
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return -EINVAL;
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return remap_pfn_range(vma, vma->vm_start, shm->paddr >> PAGE_SHIFT,
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size, vma->vm_page_prot);
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}
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static const struct dma_buf_ops tee_shm_dma_buf_ops = {
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.map_dma_buf = tee_shm_op_map_dma_buf,
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.unmap_dma_buf = tee_shm_op_unmap_dma_buf,
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.release = tee_shm_op_release,
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.map = tee_shm_op_map,
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.mmap = tee_shm_op_mmap,
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};
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static struct tee_shm *__tee_shm_alloc(struct tee_context *ctx,
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struct tee_device *teedev,
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size_t size, u32 flags)
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{
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struct tee_shm_pool_mgr *poolm = NULL;
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struct tee_shm *shm;
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void *ret;
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int rc;
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if (ctx && ctx->teedev != teedev) {
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dev_err(teedev->dev.parent, "ctx and teedev mismatch\n");
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return ERR_PTR(-EINVAL);
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}
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if (!(flags & TEE_SHM_MAPPED)) {
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dev_err(teedev->dev.parent,
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"only mapped allocations supported\n");
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return ERR_PTR(-EINVAL);
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}
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if ((flags & ~(TEE_SHM_MAPPED | TEE_SHM_DMA_BUF))) {
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dev_err(teedev->dev.parent, "invalid shm flags 0x%x", flags);
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return ERR_PTR(-EINVAL);
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}
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if (!tee_device_get(teedev))
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return ERR_PTR(-EINVAL);
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if (!teedev->pool) {
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/* teedev has been detached from driver */
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ret = ERR_PTR(-EINVAL);
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goto err_dev_put;
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}
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shm = kzalloc(sizeof(*shm), GFP_KERNEL);
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if (!shm) {
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ret = ERR_PTR(-ENOMEM);
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goto err_dev_put;
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}
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shm->flags = flags | TEE_SHM_POOL;
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shm->teedev = teedev;
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shm->ctx = ctx;
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if (flags & TEE_SHM_DMA_BUF)
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poolm = teedev->pool->dma_buf_mgr;
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else
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poolm = teedev->pool->private_mgr;
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rc = poolm->ops->alloc(poolm, shm, size);
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if (rc) {
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ret = ERR_PTR(rc);
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goto err_kfree;
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}
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mutex_lock(&teedev->mutex);
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shm->id = idr_alloc(&teedev->idr, shm, 1, 0, GFP_KERNEL);
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mutex_unlock(&teedev->mutex);
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if (shm->id < 0) {
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ret = ERR_PTR(shm->id);
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goto err_pool_free;
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}
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if (flags & TEE_SHM_DMA_BUF) {
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DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
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exp_info.ops = &tee_shm_dma_buf_ops;
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exp_info.size = shm->size;
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exp_info.flags = O_RDWR;
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exp_info.priv = shm;
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shm->dmabuf = dma_buf_export(&exp_info);
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if (IS_ERR(shm->dmabuf)) {
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ret = ERR_CAST(shm->dmabuf);
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goto err_rem;
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}
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}
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if (ctx) {
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teedev_ctx_get(ctx);
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mutex_lock(&teedev->mutex);
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list_add_tail(&shm->link, &ctx->list_shm);
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mutex_unlock(&teedev->mutex);
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}
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return shm;
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err_rem:
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mutex_lock(&teedev->mutex);
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idr_remove(&teedev->idr, shm->id);
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mutex_unlock(&teedev->mutex);
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err_pool_free:
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poolm->ops->free(poolm, shm);
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err_kfree:
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kfree(shm);
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err_dev_put:
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tee_device_put(teedev);
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return ret;
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}
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/**
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* tee_shm_alloc() - Allocate shared memory
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* @ctx: Context that allocates the shared memory
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* @size: Requested size of shared memory
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* @flags: Flags setting properties for the requested shared memory.
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*
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* Memory allocated as global shared memory is automatically freed when the
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* TEE file pointer is closed. The @flags field uses the bits defined by
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* TEE_SHM_* in <linux/tee_drv.h>. TEE_SHM_MAPPED must currently always be
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* set. If TEE_SHM_DMA_BUF global shared memory will be allocated and
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* associated with a dma-buf handle, else driver private memory.
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*/
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struct tee_shm *tee_shm_alloc(struct tee_context *ctx, size_t size, u32 flags)
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{
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return __tee_shm_alloc(ctx, ctx->teedev, size, flags);
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}
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EXPORT_SYMBOL_GPL(tee_shm_alloc);
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struct tee_shm *tee_shm_priv_alloc(struct tee_device *teedev, size_t size)
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{
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return __tee_shm_alloc(NULL, teedev, size, TEE_SHM_MAPPED);
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}
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EXPORT_SYMBOL_GPL(tee_shm_priv_alloc);
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struct tee_shm *tee_shm_register(struct tee_context *ctx, unsigned long addr,
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size_t length, u32 flags)
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{
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struct tee_device *teedev = ctx->teedev;
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const u32 req_flags = TEE_SHM_DMA_BUF | TEE_SHM_USER_MAPPED;
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struct tee_shm *shm;
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void *ret;
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int rc;
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int num_pages;
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unsigned long start;
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if (flags != req_flags)
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return ERR_PTR(-ENOTSUPP);
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if (!tee_device_get(teedev))
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return ERR_PTR(-EINVAL);
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if (!teedev->desc->ops->shm_register ||
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!teedev->desc->ops->shm_unregister) {
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tee_device_put(teedev);
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return ERR_PTR(-ENOTSUPP);
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}
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teedev_ctx_get(ctx);
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shm = kzalloc(sizeof(*shm), GFP_KERNEL);
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if (!shm) {
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ret = ERR_PTR(-ENOMEM);
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goto err;
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}
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shm->flags = flags | TEE_SHM_REGISTER;
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shm->teedev = teedev;
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shm->ctx = ctx;
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shm->id = -1;
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addr = untagged_addr(addr);
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start = rounddown(addr, PAGE_SIZE);
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shm->offset = addr - start;
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shm->size = length;
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num_pages = (roundup(addr + length, PAGE_SIZE) - start) / PAGE_SIZE;
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shm->pages = kcalloc(num_pages, sizeof(*shm->pages), GFP_KERNEL);
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if (!shm->pages) {
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ret = ERR_PTR(-ENOMEM);
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goto err;
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}
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rc = get_user_pages_fast(start, num_pages, FOLL_WRITE, shm->pages);
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if (rc > 0)
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shm->num_pages = rc;
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if (rc != num_pages) {
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if (rc >= 0)
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rc = -ENOMEM;
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ret = ERR_PTR(rc);
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goto err;
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}
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mutex_lock(&teedev->mutex);
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shm->id = idr_alloc(&teedev->idr, shm, 1, 0, GFP_KERNEL);
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mutex_unlock(&teedev->mutex);
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if (shm->id < 0) {
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ret = ERR_PTR(shm->id);
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goto err;
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}
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rc = teedev->desc->ops->shm_register(ctx, shm, shm->pages,
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shm->num_pages, start);
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if (rc) {
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ret = ERR_PTR(rc);
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goto err;
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}
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if (flags & TEE_SHM_DMA_BUF) {
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DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
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exp_info.ops = &tee_shm_dma_buf_ops;
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exp_info.size = shm->size;
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exp_info.flags = O_RDWR;
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exp_info.priv = shm;
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shm->dmabuf = dma_buf_export(&exp_info);
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if (IS_ERR(shm->dmabuf)) {
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ret = ERR_CAST(shm->dmabuf);
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teedev->desc->ops->shm_unregister(ctx, shm);
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goto err;
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}
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}
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mutex_lock(&teedev->mutex);
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list_add_tail(&shm->link, &ctx->list_shm);
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mutex_unlock(&teedev->mutex);
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return shm;
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err:
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if (shm) {
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size_t n;
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if (shm->id >= 0) {
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mutex_lock(&teedev->mutex);
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idr_remove(&teedev->idr, shm->id);
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mutex_unlock(&teedev->mutex);
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}
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if (shm->pages) {
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for (n = 0; n < shm->num_pages; n++)
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put_page(shm->pages[n]);
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kfree(shm->pages);
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}
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}
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kfree(shm);
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teedev_ctx_put(ctx);
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tee_device_put(teedev);
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return ret;
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}
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EXPORT_SYMBOL_GPL(tee_shm_register);
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/**
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* tee_shm_get_fd() - Increase reference count and return file descriptor
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* @shm: Shared memory handle
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* @returns user space file descriptor to shared memory
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*/
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int tee_shm_get_fd(struct tee_shm *shm)
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{
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int fd;
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if (!(shm->flags & TEE_SHM_DMA_BUF))
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return -EINVAL;
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get_dma_buf(shm->dmabuf);
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fd = dma_buf_fd(shm->dmabuf, O_CLOEXEC);
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if (fd < 0)
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dma_buf_put(shm->dmabuf);
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return fd;
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}
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/**
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* tee_shm_free() - Free shared memory
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* @shm: Handle to shared memory to free
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*/
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void tee_shm_free(struct tee_shm *shm)
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{
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/*
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* dma_buf_put() decreases the dmabuf reference counter and will
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* call tee_shm_release() when the last reference is gone.
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*
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* In the case of driver private memory we call tee_shm_release
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* directly instead as it doesn't have a reference counter.
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*/
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if (shm->flags & TEE_SHM_DMA_BUF)
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dma_buf_put(shm->dmabuf);
|
||
|
|
else
|
||
|
|
tee_shm_release(shm);
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL_GPL(tee_shm_free);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* tee_shm_va2pa() - Get physical address of a virtual address
|
||
|
|
* @shm: Shared memory handle
|
||
|
|
* @va: Virtual address to tranlsate
|
||
|
|
* @pa: Returned physical address
|
||
|
|
* @returns 0 on success and < 0 on failure
|
||
|
|
*/
|
||
|
|
int tee_shm_va2pa(struct tee_shm *shm, void *va, phys_addr_t *pa)
|
||
|
|
{
|
||
|
|
if (!(shm->flags & TEE_SHM_MAPPED))
|
||
|
|
return -EINVAL;
|
||
|
|
/* Check that we're in the range of the shm */
|
||
|
|
if ((char *)va < (char *)shm->kaddr)
|
||
|
|
return -EINVAL;
|
||
|
|
if ((char *)va >= ((char *)shm->kaddr + shm->size))
|
||
|
|
return -EINVAL;
|
||
|
|
|
||
|
|
return tee_shm_get_pa(
|
||
|
|
shm, (unsigned long)va - (unsigned long)shm->kaddr, pa);
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL_GPL(tee_shm_va2pa);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* tee_shm_pa2va() - Get virtual address of a physical address
|
||
|
|
* @shm: Shared memory handle
|
||
|
|
* @pa: Physical address to tranlsate
|
||
|
|
* @va: Returned virtual address
|
||
|
|
* @returns 0 on success and < 0 on failure
|
||
|
|
*/
|
||
|
|
int tee_shm_pa2va(struct tee_shm *shm, phys_addr_t pa, void **va)
|
||
|
|
{
|
||
|
|
if (!(shm->flags & TEE_SHM_MAPPED))
|
||
|
|
return -EINVAL;
|
||
|
|
/* Check that we're in the range of the shm */
|
||
|
|
if (pa < shm->paddr)
|
||
|
|
return -EINVAL;
|
||
|
|
if (pa >= (shm->paddr + shm->size))
|
||
|
|
return -EINVAL;
|
||
|
|
|
||
|
|
if (va) {
|
||
|
|
void *v = tee_shm_get_va(shm, pa - shm->paddr);
|
||
|
|
|
||
|
|
if (IS_ERR(v))
|
||
|
|
return PTR_ERR(v);
|
||
|
|
*va = v;
|
||
|
|
}
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL_GPL(tee_shm_pa2va);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* tee_shm_get_va() - Get virtual address of a shared memory plus an offset
|
||
|
|
* @shm: Shared memory handle
|
||
|
|
* @offs: Offset from start of this shared memory
|
||
|
|
* @returns virtual address of the shared memory + offs if offs is within
|
||
|
|
* the bounds of this shared memory, else an ERR_PTR
|
||
|
|
*/
|
||
|
|
void *tee_shm_get_va(struct tee_shm *shm, size_t offs)
|
||
|
|
{
|
||
|
|
if (!(shm->flags & TEE_SHM_MAPPED))
|
||
|
|
return ERR_PTR(-EINVAL);
|
||
|
|
if (offs >= shm->size)
|
||
|
|
return ERR_PTR(-EINVAL);
|
||
|
|
return (char *)shm->kaddr + offs;
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL_GPL(tee_shm_get_va);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* tee_shm_get_pa() - Get physical address of a shared memory plus an offset
|
||
|
|
* @shm: Shared memory handle
|
||
|
|
* @offs: Offset from start of this shared memory
|
||
|
|
* @pa: Physical address to return
|
||
|
|
* @returns 0 if offs is within the bounds of this shared memory, else an
|
||
|
|
* error code.
|
||
|
|
*/
|
||
|
|
int tee_shm_get_pa(struct tee_shm *shm, size_t offs, phys_addr_t *pa)
|
||
|
|
{
|
||
|
|
if (offs >= shm->size)
|
||
|
|
return -EINVAL;
|
||
|
|
if (pa)
|
||
|
|
*pa = shm->paddr + offs;
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL_GPL(tee_shm_get_pa);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* tee_shm_get_from_id() - Find shared memory object and increase reference
|
||
|
|
* count
|
||
|
|
* @ctx: Context owning the shared memory
|
||
|
|
* @id: Id of shared memory object
|
||
|
|
* @returns a pointer to 'struct tee_shm' on success or an ERR_PTR on failure
|
||
|
|
*/
|
||
|
|
struct tee_shm *tee_shm_get_from_id(struct tee_context *ctx, int id)
|
||
|
|
{
|
||
|
|
struct tee_device *teedev;
|
||
|
|
struct tee_shm *shm;
|
||
|
|
|
||
|
|
if (!ctx)
|
||
|
|
return ERR_PTR(-EINVAL);
|
||
|
|
|
||
|
|
teedev = ctx->teedev;
|
||
|
|
mutex_lock(&teedev->mutex);
|
||
|
|
shm = idr_find(&teedev->idr, id);
|
||
|
|
if (!shm || shm->ctx != ctx)
|
||
|
|
shm = ERR_PTR(-EINVAL);
|
||
|
|
else if (shm->flags & TEE_SHM_DMA_BUF)
|
||
|
|
get_dma_buf(shm->dmabuf);
|
||
|
|
mutex_unlock(&teedev->mutex);
|
||
|
|
return shm;
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL_GPL(tee_shm_get_from_id);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* tee_shm_put() - Decrease reference count on a shared memory handle
|
||
|
|
* @shm: Shared memory handle
|
||
|
|
*/
|
||
|
|
void tee_shm_put(struct tee_shm *shm)
|
||
|
|
{
|
||
|
|
if (shm->flags & TEE_SHM_DMA_BUF)
|
||
|
|
dma_buf_put(shm->dmabuf);
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL_GPL(tee_shm_put);
|