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/*
* A GEM style CMA backed memory manager for ZynQ based OpenCL accelerators.
*
* Copyright (C) 2016 Xilinx, Inc. All rights reserved.
*
* Authors:
* Sonal Santan <sonal.santan@xilinx.com>
* Umang Parekh <umang.parekh@xilinx.com>
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
* may be copied, distributed, and modified under those terms.
*
* 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/dma-buf.h>
#include <linux/module.h>
#include <linux/ramfs.h>
#include <linux/shmem_fs.h>
#include "zocl_drv.h"
#include <drm/drmP.h>
#include <drm/drm_gem.h>
#include <linux/zocl_ioctl.h>
static inline void __user *to_user_ptr(u64 address)
{
return (void __user *)(uintptr_t)address;
}
void zocl_describe(const struct drm_zocl_bo *obj)
{
size_t size_in_kb = obj->base.base.size / 1024;
size_t physical_addr = obj->base.paddr;
DRM_INFO("%p: H[0x%zxKB] D[0x%zx]\n",
obj,
size_in_kb,
physical_addr);
}
static struct drm_zocl_bo *zocl_create_bo(struct drm_device *dev,
uint64_t unaligned_size)
{
size_t size = PAGE_ALIGN(unaligned_size);
struct drm_gem_cma_object *cma_obj;
DRM_DEBUG("%s:%s:%d: %zd\n", __FILE__, __func__, __LINE__, size);
if (!size)
return ERR_PTR(-EINVAL);
cma_obj = drm_gem_cma_create(dev, size);
if (IS_ERR(cma_obj))
return ERR_PTR(-ENOMEM);
return to_zocl_bo(&cma_obj->base);
}
int zocl_create_bo_ioctl(struct drm_device *dev,
void *data,
struct drm_file *filp)
{
int ret;
struct drm_zocl_create_bo *args = data;
struct drm_zocl_bo *bo;
if (((args->flags & DRM_ZOCL_BO_FLAGS_COHERENT) == 0) ||
((args->flags & DRM_ZOCL_BO_FLAGS_CMA) == 0))
return -EINVAL;
bo = zocl_create_bo(dev, args->size);
bo->flags |= DRM_ZOCL_BO_FLAGS_COHERENT;
bo->flags |= DRM_ZOCL_BO_FLAGS_CMA;
DRM_DEBUG("%s:%s:%d: %p\n", __FILE__, __func__, __LINE__, bo);
if (IS_ERR(bo)) {
DRM_DEBUG("object creation failed\n");
return PTR_ERR(bo);
}
ret = drm_gem_handle_create(filp, &bo->base.base, &args->handle);
if (ret) {
drm_gem_cma_free_object(&bo->base.base);
DRM_DEBUG("handle creation failed\n");
return ret;
}
zocl_describe(bo);
drm_gem_object_unreference_unlocked(&bo->base.base);
return ret;
}
int zocl_map_bo_ioctl(struct drm_device *dev,
void *data,
struct drm_file *filp)
{
struct drm_zocl_map_bo *args = data;
struct drm_gem_object *gem_obj;
DRM_DEBUG("%s:%s:%d: %p\n", __FILE__, __func__, __LINE__, data);
gem_obj = drm_gem_object_lookup(dev, filp, args->handle);
if (!gem_obj) {
DRM_ERROR("Failed to look up GEM BO %d\n", args->handle);
return -EINVAL;
}
/* The mmap offset was set up at BO allocation time. */
args->offset = drm_vma_node_offset_addr(&gem_obj->vma_node);
zocl_describe(to_zocl_bo(gem_obj));
drm_gem_object_unreference_unlocked(gem_obj);
return 0;
}
int zocl_sync_bo_ioctl(struct drm_device *dev,
void *data,
struct drm_file *filp)
{
const struct drm_zocl_sync_bo *args = data;
struct drm_gem_object *gem_obj = drm_gem_object_lookup(dev, filp,
args->handle);
void *kaddr;
int ret = 0;
DRM_DEBUG("%s:%s:%d: %p\n", __FILE__, __func__, __LINE__, data);
if (!gem_obj) {
DRM_ERROR("Failed to look up GEM BO %d\n", args->handle);
return -EINVAL;
}
if ((args->offset > gem_obj->size) || (args->size > gem_obj->size) ||
((args->offset + args->size) > gem_obj->size)) {
ret = -EINVAL;
goto out;
}
kaddr = drm_gem_cma_prime_vmap(gem_obj);
/* only invalidate the range of addresses requested by the user */
kaddr += args->offset;
if (args->dir == DRM_ZOCL_SYNC_BO_TO_DEVICE)
flush_kernel_vmap_range(kaddr, args->size);
else if (args->dir == DRM_ZOCL_SYNC_BO_FROM_DEVICE)
invalidate_kernel_vmap_range(kaddr, args->size);
else
ret = -EINVAL;
out:
drm_gem_object_unreference_unlocked(gem_obj);
return ret;
}
int zocl_info_bo_ioctl(struct drm_device *dev,
void *data,
struct drm_file *filp)
{
const struct drm_zocl_bo *bo;
struct drm_zocl_info_bo *args = data;
struct drm_gem_object *gem_obj = drm_gem_object_lookup(dev, filp,
args->handle);
DRM_DEBUG("%s:%s:%d: %p\n", __FILE__, __func__, __LINE__, data);
if (!gem_obj) {
DRM_ERROR("Failed to look up GEM BO %d\n", args->handle);
return -EINVAL;
}
bo = to_zocl_bo(gem_obj);
args->size = bo->base.base.size;
args->paddr = bo->base.paddr;
drm_gem_object_unreference_unlocked(gem_obj);
return 0;
}
int zocl_pwrite_bo_ioctl(struct drm_device *dev, void *data,
struct drm_file *filp)
{
const struct drm_zocl_pwrite_bo *args = data;
struct drm_gem_object *gem_obj = drm_gem_object_lookup(dev, filp,
args->handle);
char __user *user_data = to_user_ptr(args->data_ptr);
int ret = 0;
void *kaddr;
DRM_DEBUG("%s:%s:%d: %p\n", __FILE__, __func__, __LINE__, data);
if (!gem_obj) {
DRM_ERROR("Failed to look up GEM BO %d\n", args->handle);
return -EINVAL;
}
if ((args->offset > gem_obj->size) || (args->size > gem_obj->size)
|| ((args->offset + args->size) > gem_obj->size)) {
ret = -EINVAL;
goto out;
}
if (args->size == 0) {
ret = 0;
goto out;
}
if (!access_ok(VERIFY_READ, user_data, args->size)) {
ret = -EFAULT;
goto out;
}
kaddr = drm_gem_cma_prime_vmap(gem_obj);
kaddr += args->offset;
ret = copy_from_user(kaddr, user_data, args->size);
out:
drm_gem_object_unreference_unlocked(gem_obj);
return ret;
}
int zocl_pread_bo_ioctl(struct drm_device *dev, void *data,
struct drm_file *filp)
{
const struct drm_zocl_pread_bo *args = data;
struct drm_gem_object *gem_obj = drm_gem_object_lookup(dev, filp,
args->handle);
char __user *user_data = to_user_ptr(args->data_ptr);
int ret = 0;
void *kaddr;
DRM_DEBUG("%s:%s:%d: %p\n", __FILE__, __func__, __LINE__, data);
if (!gem_obj) {
DRM_ERROR("Failed to look up GEM BO %d\n", args->handle);
return -EINVAL;
}
if ((args->offset > gem_obj->size) || (args->size > gem_obj->size)
|| ((args->offset + args->size) > gem_obj->size)) {
ret = -EINVAL;
goto out;
}
if (args->size == 0) {
ret = 0;
goto out;
}
if (!access_ok(VERIFY_WRITE, user_data, args->size)) {
ret = EFAULT;
goto out;
}
kaddr = drm_gem_cma_prime_vmap(gem_obj);
kaddr += args->offset;
ret = copy_to_user(user_data, kaddr, args->size);
out:
drm_gem_object_unreference_unlocked(gem_obj);
return ret;
}
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