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// SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note
/*
*
* (C) COPYRIGHT 2019-2021 ARM Limited. All rights reserved.
*
* This program is free software and is provided to you under the terms of the
* GNU General Public License version 2 as published by the Free Software
* Foundation, and any use by you of this program is subject to the terms
* of such GNU license.
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, you can access it online at
* http://www.gnu.org/licenses/gpl-2.0.html.
*
*/
#include "mali_kbase_csf_protected_memory.h"
#include <linux/protected_memory_allocator.h>
#if IS_ENABLED(CONFIG_OF)
#include <linux/of_platform.h>
#endif
int kbase_csf_protected_memory_init(struct kbase_device *const kbdev)
{
int err = 0;
#if IS_ENABLED(CONFIG_OF)
struct device_node *pma_node = of_parse_phandle(kbdev->dev->of_node,
"protected-memory-allocator", 0);
if (!pma_node) {
dev_info(kbdev->dev, "Protected memory allocator not available\n");
} else {
struct platform_device *const pdev =
of_find_device_by_node(pma_node);
kbdev->csf.pma_dev = NULL;
if (!pdev) {
dev_err(kbdev->dev, "Platform device for Protected memory allocator not found\n");
} else {
kbdev->csf.pma_dev = platform_get_drvdata(pdev);
if (!kbdev->csf.pma_dev) {
dev_info(kbdev->dev, "Protected memory allocator is not ready\n");
err = -EPROBE_DEFER;
} else if (!try_module_get(kbdev->csf.pma_dev->owner)) {
dev_err(kbdev->dev, "Failed to get Protected memory allocator module\n");
err = -ENODEV;
} else {
err = dma_set_mask_and_coherent(&pdev->dev,
DMA_BIT_MASK(kbdev->gpu_props.mmu.pa_bits));
if (err)
dev_err(&(pdev->dev), "protected_memory_allocator set dma fail\n");
else
dev_info(kbdev->dev, "Protected memory allocator successfully loaded\n");
}
}
of_node_put(pma_node);
}
#endif
return err;
}
void kbase_csf_protected_memory_term(struct kbase_device *const kbdev)
{
if (kbdev->csf.pma_dev)
module_put(kbdev->csf.pma_dev->owner);
}
struct protected_memory_allocation **
kbase_csf_protected_memory_alloc(
struct kbase_device *const kbdev,
struct tagged_addr *phys,
size_t num_pages,
bool is_small_page)
{
size_t i;
struct protected_memory_allocator_device *pma_dev =
kbdev->csf.pma_dev;
struct protected_memory_allocation **pma = NULL;
unsigned int order = KBASE_MEM_POOL_2MB_PAGE_TABLE_ORDER;
unsigned int num_pages_order;
if (is_small_page)
order = KBASE_MEM_POOL_4KB_PAGE_TABLE_ORDER;
num_pages_order = (1u << order);
/* Ensure the requested num_pages is aligned with
* the order type passed as argument.
*
* pma_alloc_page() will then handle the granularity
* of the allocation based on order.
*/
num_pages = div64_u64(num_pages + num_pages_order - 1, num_pages_order);
pma = kmalloc_array(num_pages, sizeof(*pma), GFP_KERNEL);
if (WARN_ON(!pma_dev) || WARN_ON(!phys) || !pma)
return NULL;
for (i = 0; i < num_pages; i++) {
phys_addr_t phys_addr;
pma[i] = pma_dev->ops.pma_alloc_page(pma_dev, order);
if (!pma[i])
break;
phys_addr = pma_dev->ops.pma_get_phys_addr(pma_dev, pma[i]);
if (order) {
size_t j;
*phys++ = as_tagged_tag(phys_addr, HUGE_HEAD | HUGE_PAGE);
for (j = 1; j < num_pages_order; j++) {
*phys++ = as_tagged_tag(phys_addr +
PAGE_SIZE * j,
HUGE_PAGE);
}
} else {
phys[i] = as_tagged(phys_addr);
}
}
if (i != num_pages) {
kbase_csf_protected_memory_free(kbdev, pma, i * num_pages_order, is_small_page);
return NULL;
}
return pma;
}
void kbase_csf_protected_memory_free(
struct kbase_device *const kbdev,
struct protected_memory_allocation **pma,
size_t num_pages,
bool is_small_page)
{
size_t i;
struct protected_memory_allocator_device *pma_dev =
kbdev->csf.pma_dev;
unsigned int num_pages_order = (1u << KBASE_MEM_POOL_2MB_PAGE_TABLE_ORDER);
if (is_small_page)
num_pages_order = (1u << KBASE_MEM_POOL_4KB_PAGE_TABLE_ORDER);
if (WARN_ON(!pma_dev) || WARN_ON(!pma))
return;
/* Ensure the requested num_pages is aligned with
* the order type passed as argument.
*
* pma_alloc_page() will then handle the granularity
* of the allocation based on order.
*/
num_pages = div64_u64(num_pages + num_pages_order - 1, num_pages_order);
for (i = 0; i < num_pages; i++)
pma_dev->ops.pma_free_page(pma_dev, pma[i]);
kfree(pma);
}
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