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89 lines
2.0 KiB
89 lines
2.0 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Copyright (c) 2015, Linaro Limited |
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* Copyright (c) 2017, EPAM Systems |
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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/genalloc.h> |
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#include <linux/slab.h> |
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#include <linux/tee_drv.h> |
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#include "optee_private.h" |
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#include "optee_smc.h" |
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#include "shm_pool.h" |
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static int pool_op_alloc(struct tee_shm_pool_mgr *poolm, |
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struct tee_shm *shm, size_t size) |
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{ |
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unsigned int order = get_order(size); |
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struct page *page; |
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int rc = 0; |
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page = alloc_pages(GFP_KERNEL | __GFP_ZERO, order); |
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if (!page) |
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return -ENOMEM; |
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shm->kaddr = page_address(page); |
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shm->paddr = page_to_phys(page); |
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shm->size = PAGE_SIZE << order; |
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if (shm->flags & TEE_SHM_DMA_BUF) { |
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unsigned int nr_pages = 1 << order, i; |
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struct page **pages; |
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pages = kcalloc(nr_pages, sizeof(pages), GFP_KERNEL); |
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if (!pages) |
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return -ENOMEM; |
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for (i = 0; i < nr_pages; i++) { |
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pages[i] = page; |
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page++; |
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} |
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shm->flags |= TEE_SHM_REGISTER; |
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rc = optee_shm_register(shm->ctx, shm, pages, nr_pages, |
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(unsigned long)shm->kaddr); |
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kfree(pages); |
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} |
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return rc; |
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} |
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static void pool_op_free(struct tee_shm_pool_mgr *poolm, |
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struct tee_shm *shm) |
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{ |
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if (shm->flags & TEE_SHM_DMA_BUF) |
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optee_shm_unregister(shm->ctx, shm); |
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free_pages((unsigned long)shm->kaddr, get_order(shm->size)); |
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shm->kaddr = NULL; |
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} |
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static void pool_op_destroy_poolmgr(struct tee_shm_pool_mgr *poolm) |
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{ |
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kfree(poolm); |
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} |
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static const struct tee_shm_pool_mgr_ops pool_ops = { |
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.alloc = pool_op_alloc, |
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.free = pool_op_free, |
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.destroy_poolmgr = pool_op_destroy_poolmgr, |
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}; |
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/** |
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* optee_shm_pool_alloc_pages() - create page-based allocator pool |
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* |
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* This pool is used when OP-TEE supports dymanic SHM. In this case |
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* command buffers and such are allocated from kernel's own memory. |
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*/ |
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struct tee_shm_pool_mgr *optee_shm_pool_alloc_pages(void) |
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{ |
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struct tee_shm_pool_mgr *mgr = kzalloc(sizeof(*mgr), GFP_KERNEL); |
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if (!mgr) |
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return ERR_PTR(-ENOMEM); |
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mgr->ops = &pool_ops; |
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return mgr; |
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}
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