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// SPDX-License-Identifier: GPL-2.0-only
/* Copyright 2024-2025 Tomeu Vizoso <tomeu@tomeuvizoso.net> */
#include <drm/drm_device.h>
#include <drm/drm_utils.h>
#include <drm/rocket_accel.h>
#include <linux/dma-mapping.h>
#include <linux/iommu.h>
#include "rocket_drv.h"
#include "rocket_gem.h"
static void rocket_gem_bo_free(struct drm_gem_object *obj)
{
struct rocket_gem_object *bo = to_rocket_bo(obj);
struct rocket_file_priv *rocket_priv = bo->driver_priv;
size_t unmapped;
drm_WARN_ON(obj->dev, refcount_read(&bo->base.pages_use_count) > 1);
unmapped = iommu_unmap(bo->domain->domain, bo->mm.start, bo->size);
drm_WARN_ON(obj->dev, unmapped != bo->size);
mutex_lock(&rocket_priv->mm_lock);
drm_mm_remove_node(&bo->mm);
mutex_unlock(&rocket_priv->mm_lock);
rocket_iommu_domain_put(bo->domain);
bo->domain = NULL;
drm_gem_shmem_free(&bo->base);
}
static const struct drm_gem_object_funcs rocket_gem_funcs = {
.free = rocket_gem_bo_free,
.print_info = drm_gem_shmem_object_print_info,
.pin = drm_gem_shmem_object_pin,
.unpin = drm_gem_shmem_object_unpin,
.get_sg_table = drm_gem_shmem_object_get_sg_table,
.vmap = drm_gem_shmem_object_vmap,
.vunmap = drm_gem_shmem_object_vunmap,
.mmap = drm_gem_shmem_object_mmap,
.vm_ops = &drm_gem_shmem_vm_ops,
};
struct drm_gem_object *rocket_gem_create_object(struct drm_device *dev, size_t size)
{
struct rocket_gem_object *obj;
obj = kzalloc(sizeof(*obj), GFP_KERNEL);
if (!obj)
return ERR_PTR(-ENOMEM);
obj->base.base.funcs = &rocket_gem_funcs;
return &obj->base.base;
}
int rocket_ioctl_create_bo(struct drm_device *dev, void *data, struct drm_file *file)
{
struct rocket_file_priv *rocket_priv = file->driver_priv;
struct drm_rocket_create_bo *args = data;
struct drm_gem_shmem_object *shmem_obj;
struct rocket_gem_object *rkt_obj;
struct drm_gem_object *gem_obj;
struct sg_table *sgt;
int ret;
shmem_obj = drm_gem_shmem_create(dev, args->size);
if (IS_ERR(shmem_obj))
return PTR_ERR(shmem_obj);
gem_obj = &shmem_obj->base;
rkt_obj = to_rocket_bo(gem_obj);
rkt_obj->driver_priv = rocket_priv;
rkt_obj->domain = rocket_iommu_domain_get(rocket_priv);
rkt_obj->size = args->size;
rkt_obj->offset = 0;
ret = drm_gem_handle_create(file, gem_obj, &args->handle);
drm_gem_object_put(gem_obj);
if (ret)
goto err;
sgt = drm_gem_shmem_get_pages_sgt(shmem_obj);
if (IS_ERR(sgt)) {
ret = PTR_ERR(sgt);
goto err;
}
mutex_lock(&rocket_priv->mm_lock);
ret = drm_mm_insert_node_generic(&rocket_priv->mm, &rkt_obj->mm,
rkt_obj->size, PAGE_SIZE,
0, 0);
mutex_unlock(&rocket_priv->mm_lock);
ret = iommu_map_sgtable(rocket_priv->domain->domain,
rkt_obj->mm.start,
shmem_obj->sgt,
IOMMU_READ | IOMMU_WRITE);
if (ret < 0 || ret < args->size) {
drm_err(dev, "failed to map buffer: size=%d request_size=%u\n",
ret, args->size);
ret = -ENOMEM;
goto err_remove_node;
}
/* iommu_map_sgtable might have aligned the size */
rkt_obj->size = ret;
args->offset = drm_vma_node_offset_addr(&gem_obj->vma_node);
args->dma_address = rkt_obj->mm.start;
return 0;
err_remove_node:
mutex_lock(&rocket_priv->mm_lock);
drm_mm_remove_node(&rkt_obj->mm);
mutex_unlock(&rocket_priv->mm_lock);
err:
drm_gem_shmem_object_free(gem_obj);
return ret;
}
int rocket_ioctl_prep_bo(struct drm_device *dev, void *data, struct drm_file *file)
{
struct drm_rocket_prep_bo *args = data;
unsigned long timeout = drm_timeout_abs_to_jiffies(args->timeout_ns);
struct drm_gem_object *gem_obj;
struct drm_gem_shmem_object *shmem_obj;
long ret = 0;
if (args->reserved != 0) {
drm_dbg(dev, "Reserved field in drm_rocket_prep_bo struct should be 0.\n");
return -EINVAL;
}
gem_obj = drm_gem_object_lookup(file, args->handle);
if (!gem_obj)
return -ENOENT;
ret = dma_resv_wait_timeout(gem_obj->resv, DMA_RESV_USAGE_WRITE, true, timeout);
if (!ret)
ret = timeout ? -ETIMEDOUT : -EBUSY;
shmem_obj = &to_rocket_bo(gem_obj)->base;
dma_sync_sgtable_for_cpu(dev->dev, shmem_obj->sgt, DMA_BIDIRECTIONAL);
drm_gem_object_put(gem_obj);
return ret;
}
int rocket_ioctl_fini_bo(struct drm_device *dev, void *data, struct drm_file *file)
{
struct drm_rocket_fini_bo *args = data;
struct drm_gem_shmem_object *shmem_obj;
struct rocket_gem_object *rkt_obj;
struct drm_gem_object *gem_obj;
if (args->reserved != 0) {
drm_dbg(dev, "Reserved field in drm_rocket_fini_bo struct should be 0.\n");
return -EINVAL;
}
gem_obj = drm_gem_object_lookup(file, args->handle);
if (!gem_obj)
return -ENOENT;
rkt_obj = to_rocket_bo(gem_obj);
shmem_obj = &rkt_obj->base;
dma_sync_sgtable_for_device(dev->dev, shmem_obj->sgt, DMA_BIDIRECTIONAL);
drm_gem_object_put(gem_obj);
return 0;
}
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