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/* SPDX-License-Identifier: GPL-2.0 or MIT */
/* Copyright 2019 Linaro, Ltd, Rob Herring <robh@kernel.org> */
/* Copyright 2023 Collabora ltd. */
#ifndef __PANTHOR_GEM_H__
#define __PANTHOR_GEM_H__
#include <drm/drm_gem_shmem_helper.h>
#include <drm/drm_mm.h>
#include <linux/iosys-map.h>
#include <linux/rwsem.h>
struct panthor_vm;
/**
* struct panthor_gem_object - Driver specific GEM object.
*/
struct panthor_gem_object {
/** @base: Inherit from drm_gem_shmem_object. */
struct drm_gem_shmem_object base;
/**
* @exclusive_vm_root_gem: Root GEM of the exclusive VM this GEM object
* is attached to.
*
* If @exclusive_vm_root_gem != NULL, any attempt to bind the GEM to a
* different VM will fail.
*
* All FW memory objects have this field set to the root GEM of the MCU
* VM.
*/
struct drm_gem_object *exclusive_vm_root_gem;
/**
* @gpuva_list_lock: Custom GPUVA lock.
*
* Used to protect insertion of drm_gpuva elements to the
* drm_gem_object.gpuva.list list.
*
* We can't use the GEM resv for that, because drm_gpuva_link() is
* called in a dma-signaling path, where we're not allowed to take
* resv locks.
*/
struct mutex gpuva_list_lock;
/** @flags: Combination of drm_panthor_bo_flags flags. */
u32 flags;
};
/**
* struct panthor_kernel_bo - Kernel buffer object.
*
* These objects are only manipulated by the kernel driver and not
* directly exposed to the userspace. The GPU address of a kernel
* BO might be passed to userspace though.
*/
struct panthor_kernel_bo {
/**
* @obj: The GEM object backing this kernel buffer object.
*/
struct drm_gem_object *obj;
/**
* @vm: VM this private buffer is attached to.
*/
struct panthor_vm *vm;
/**
* @va_node: VA space allocated to this GEM.
*/
struct drm_mm_node va_node;
/**
* @kmap: Kernel CPU mapping of @gem.
*/
void *kmap;
};
static inline
struct panthor_gem_object *to_panthor_bo(struct drm_gem_object *obj)
{
return container_of(to_drm_gem_shmem_obj(obj), struct panthor_gem_object, base);
}
struct drm_gem_object *panthor_gem_create_object(struct drm_device *ddev, size_t size);
struct drm_gem_object *
panthor_gem_prime_import_sg_table(struct drm_device *ddev,
struct dma_buf_attachment *attach,
struct sg_table *sgt);
int
panthor_gem_create_with_handle(struct drm_file *file,
struct drm_device *ddev,
struct panthor_vm *exclusive_vm,
u64 *size, u32 flags, uint32_t *handle);
static inline u64
panthor_kernel_bo_gpuva(struct panthor_kernel_bo *bo)
{
return bo->va_node.start;
}
static inline size_t
panthor_kernel_bo_size(struct panthor_kernel_bo *bo)
{
return bo->obj->size;
}
static inline int
panthor_kernel_bo_vmap(struct panthor_kernel_bo *bo)
{
struct iosys_map map;
int ret;
if (bo->kmap)
return 0;
ret = drm_gem_vmap_unlocked(bo->obj, &map);
if (ret)
return ret;
bo->kmap = map.vaddr;
return 0;
}
static inline void
panthor_kernel_bo_vunmap(struct panthor_kernel_bo *bo)
{
if (bo->kmap) {
struct iosys_map map = IOSYS_MAP_INIT_VADDR(bo->kmap);
drm_gem_vunmap_unlocked(bo->obj, &map);
bo->kmap = NULL;
}
}
struct panthor_kernel_bo *
panthor_kernel_bo_create(struct panthor_device *ptdev, struct panthor_vm *vm,
size_t size, u32 bo_flags, u32 vm_map_flags,
u64 gpu_va);
void panthor_kernel_bo_destroy(struct panthor_kernel_bo *bo);
#endif /* __PANTHOR_GEM_H__ */
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