![Jens Wiklander](/assets/img/avatar_default.png)
tee_shm_op_mmap() uses the TEE_SHM_USER_MAPPED flag instead of the TEE_SHM_REGISTER flag to tell if a shared memory object is originating from registered user space memory. Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>
455 lines
10 KiB
C
455 lines
10 KiB
C
// 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->ctx->teedev;
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if (shm->flags & TEE_SHM_DMA_BUF) {
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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->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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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 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_USER_MAPPED)
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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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.mmap = tee_shm_op_mmap,
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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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struct tee_device *teedev = ctx->teedev;
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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 (!(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->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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if (flags & TEE_SHM_DMA_BUF) {
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DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
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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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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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return shm;
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err_rem:
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if (flags & TEE_SHM_DMA_BUF) {
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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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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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EXPORT_SYMBOL_GPL(tee_shm_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->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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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);
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else
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tee_shm_release(shm);
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}
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EXPORT_SYMBOL_GPL(tee_shm_free);
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/**
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* tee_shm_va2pa() - Get physical address of a virtual address
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* @shm: Shared memory handle
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* @va: Virtual address to tranlsate
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* @pa: Returned physical address
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* @returns 0 on success and < 0 on failure
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*/
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int tee_shm_va2pa(struct tee_shm *shm, void *va, phys_addr_t *pa)
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{
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if (!(shm->flags & TEE_SHM_MAPPED))
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return -EINVAL;
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/* Check that we're in the range of the shm */
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if ((char *)va < (char *)shm->kaddr)
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return -EINVAL;
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if ((char *)va >= ((char *)shm->kaddr + shm->size))
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return -EINVAL;
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return tee_shm_get_pa(
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shm, (unsigned long)va - (unsigned long)shm->kaddr, pa);
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}
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EXPORT_SYMBOL_GPL(tee_shm_va2pa);
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/**
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* tee_shm_pa2va() - Get virtual address of a physical address
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* @shm: Shared memory handle
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* @pa: Physical address to tranlsate
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* @va: Returned virtual address
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* @returns 0 on success and < 0 on failure
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*/
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int tee_shm_pa2va(struct tee_shm *shm, phys_addr_t pa, void **va)
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{
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if (!(shm->flags & TEE_SHM_MAPPED))
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return -EINVAL;
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/* Check that we're in the range of the shm */
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if (pa < shm->paddr)
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return -EINVAL;
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if (pa >= (shm->paddr + shm->size))
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return -EINVAL;
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if (va) {
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void *v = tee_shm_get_va(shm, pa - shm->paddr);
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if (IS_ERR(v))
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return PTR_ERR(v);
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*va = v;
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}
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return 0;
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}
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EXPORT_SYMBOL_GPL(tee_shm_pa2va);
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/**
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* tee_shm_get_va() - Get virtual address of a shared memory plus an offset
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* @shm: Shared memory handle
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* @offs: Offset from start of this shared memory
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* @returns virtual address of the shared memory + offs if offs is within
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* the bounds of this shared memory, else an ERR_PTR
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*/
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void *tee_shm_get_va(struct tee_shm *shm, size_t offs)
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{
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if (!(shm->flags & TEE_SHM_MAPPED))
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return ERR_PTR(-EINVAL);
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if (offs >= shm->size)
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return ERR_PTR(-EINVAL);
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return (char *)shm->kaddr + offs;
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}
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EXPORT_SYMBOL_GPL(tee_shm_get_va);
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/**
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* tee_shm_get_pa() - Get physical address of a shared memory plus an offset
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* @shm: Shared memory handle
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* @offs: Offset from start of this shared memory
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* @pa: Physical address to return
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* @returns 0 if offs is within the bounds of this shared memory, else an
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* error code.
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*/
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int tee_shm_get_pa(struct tee_shm *shm, size_t offs, phys_addr_t *pa)
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{
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if (offs >= shm->size)
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return -EINVAL;
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if (pa)
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*pa = shm->paddr + offs;
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return 0;
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}
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EXPORT_SYMBOL_GPL(tee_shm_get_pa);
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/**
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* tee_shm_get_from_id() - Find shared memory object and increase reference
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* count
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* @ctx: Context owning the shared memory
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* @id: Id of shared memory object
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* @returns a pointer to 'struct tee_shm' on success or an ERR_PTR on failure
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*/
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struct tee_shm *tee_shm_get_from_id(struct tee_context *ctx, int id)
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{
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struct tee_device *teedev;
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struct tee_shm *shm;
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if (!ctx)
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return ERR_PTR(-EINVAL);
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teedev = ctx->teedev;
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mutex_lock(&teedev->mutex);
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shm = idr_find(&teedev->idr, id);
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if (!shm || shm->ctx != ctx)
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shm = ERR_PTR(-EINVAL);
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else if (shm->flags & TEE_SHM_DMA_BUF)
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get_dma_buf(shm->dmabuf);
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mutex_unlock(&teedev->mutex);
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return shm;
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}
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EXPORT_SYMBOL_GPL(tee_shm_get_from_id);
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/**
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* tee_shm_put() - Decrease reference count on a shared memory handle
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* @shm: Shared memory handle
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*/
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void tee_shm_put(struct tee_shm *shm)
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{
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if (shm->flags & TEE_SHM_DMA_BUF)
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dma_buf_put(shm->dmabuf);
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}
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EXPORT_SYMBOL_GPL(tee_shm_put);
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