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53 lines
1.4 KiB
53 lines
1.4 KiB
/*
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* Copyright (c) 2017-2018, The Linux Foundation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 and
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* only version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#include <linux/kernel.h>
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#include <soc/qcom/secure_buffer.h>
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#include <linux/arm-smmu-errata.h>
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static struct page *guard_pages[VMID_LAST];
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static DEFINE_MUTEX(guard_page_lock);
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struct page *arm_smmu_errata_get_guard_page(int vmid)
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{
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struct page *page;
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int ret;
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int source_vm = VMID_HLOS;
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int dest_vm = vmid;
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int dest_perm = PERM_READ | PERM_WRITE | PERM_EXEC;
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size_t size = ARM_SMMU_MIN_IOVA_ALIGN;
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mutex_lock(&guard_page_lock);
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page = guard_pages[vmid];
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if (page)
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goto out;
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page = alloc_pages(GFP_KERNEL, get_order(size));
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if (!page)
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goto out;
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if (vmid != VMID_HLOS) {
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ret = hyp_assign_phys(page_to_phys(page), PAGE_ALIGN(size),
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&source_vm, 1,
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&dest_vm, &dest_perm, 1);
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if (ret && (ret != -EIO)) {
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__free_pages(page, get_order(size));
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page = NULL;
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}
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}
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guard_pages[vmid] = page;
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out:
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mutex_unlock(&guard_page_lock);
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return page;
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}
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