mirror of
https://github.com/rd-stuffs/msm-4.14.git
synced 2025-02-20 11:45:48 +08:00
65111b1f1c
Not all targets support hyp_assign. Ignore the return error if scm_call return indicate that SMC_ID is not supported. Change-Id: Ia3e25b1c7d1f4b24f6da0143901aa1cb9a8ea3e2 Signed-off-by: Prakash Gupta <guptap@codeaurora.org>
54 lines
1.4 KiB
C
54 lines
1.4 KiB
C
/*
|
|
* Copyright (c) 2017-2018, The Linux Foundation. All rights reserved.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 and
|
|
* only version 2 as published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <soc/qcom/secure_buffer.h>
|
|
#include <linux/arm-smmu-errata.h>
|
|
|
|
static struct page *guard_pages[VMID_LAST];
|
|
static DEFINE_MUTEX(guard_page_lock);
|
|
|
|
struct page *arm_smmu_errata_get_guard_page(int vmid)
|
|
{
|
|
struct page *page;
|
|
int ret;
|
|
int source_vm = VMID_HLOS;
|
|
int dest_vm = vmid;
|
|
int dest_perm = PERM_READ | PERM_WRITE | PERM_EXEC;
|
|
size_t size = ARM_SMMU_MIN_IOVA_ALIGN;
|
|
|
|
mutex_lock(&guard_page_lock);
|
|
page = guard_pages[vmid];
|
|
if (page)
|
|
goto out;
|
|
|
|
page = alloc_pages(GFP_KERNEL, get_order(size));
|
|
if (!page)
|
|
goto out;
|
|
|
|
if (vmid != VMID_HLOS) {
|
|
ret = hyp_assign_phys(page_to_phys(page), PAGE_ALIGN(size),
|
|
&source_vm, 1,
|
|
&dest_vm, &dest_perm, 1);
|
|
if (ret && (ret != -EIO)) {
|
|
__free_pages(page, get_order(size));
|
|
page = NULL;
|
|
}
|
|
}
|
|
guard_pages[vmid] = page;
|
|
out:
|
|
mutex_unlock(&guard_page_lock);
|
|
return page;
|
|
}
|