1 files changed, 232 insertions, 0 deletions
diff --git a/drivers/gpu/drm/panthor/panthor_gem.c b/drivers/gpu/drm/panthor/panthor_gem.c
new file mode 100644
index 000000000000..38f560864879
--- /dev/null
+++ b/drivers/gpu/drm/panthor/panthor_gem.c
@@ -0,0 +1,232 @@
+// SPDX-License-Identifier: GPL-2.0 or MIT
+/* Copyright 2019 Linaro, Ltd, Rob Herring <robh@kernel.org> */
+/* Copyright 2023 Collabora ltd. */
+
+#include <linux/dma-buf.h>
+#include <linux/dma-mapping.h>
+#include <linux/err.h>
+#include <linux/slab.h>
+
+#include <drm/panthor_drm.h>
+
+#include "panthor_device.h"
+#include "panthor_gem.h"
+#include "panthor_mmu.h"
+
+static void panthor_gem_free_object(struct drm_gem_object *obj)
+{
+	struct panthor_gem_object *bo = to_panthor_bo(obj);
+	struct drm_gem_object *vm_root_gem = bo->exclusive_vm_root_gem;
+
+	drm_gem_free_mmap_offset(&bo->base.base);
+	mutex_destroy(&bo->gpuva_list_lock);
+	drm_gem_shmem_free(&bo->base);
+	drm_gem_object_put(vm_root_gem);
+}
+
+/**
+ * panthor_kernel_bo_destroy() - Destroy a kernel buffer object
+ * @bo: Kernel buffer object to destroy. If NULL or an ERR_PTR(), the destruction
+ * is skipped.
+ */
+void panthor_kernel_bo_destroy(struct panthor_kernel_bo *bo)
+{
+	struct panthor_vm *vm;
+	int ret;
+
+	if (IS_ERR_OR_NULL(bo))
+		return;
+
+	vm = bo->vm;
+	panthor_kernel_bo_vunmap(bo);
+
+	if (drm_WARN_ON(bo->obj->dev,
+			to_panthor_bo(bo->obj)->exclusive_vm_root_gem != panthor_vm_root_gem(vm)))
+		goto out_free_bo;
+
+	ret = panthor_vm_unmap_range(vm, bo->va_node.start,
+				     panthor_kernel_bo_size(bo));
+	if (ret)
+		goto out_free_bo;
+
+	panthor_vm_free_va(vm, &bo->va_node);
+	drm_gem_object_put(bo->obj);
+
+out_free_bo:
+	panthor_vm_put(vm);
+	kfree(bo);
+}
+
+/**
+ * panthor_kernel_bo_create() - Create and map a GEM object to a VM
+ * @ptdev: Device.
+ * @vm: VM to map the GEM to. If NULL, the kernel object is not GPU mapped.
+ * @size: Size of the buffer object.
+ * @bo_flags: Combination of drm_panthor_bo_flags flags.
+ * @vm_map_flags: Combination of drm_panthor_vm_bind_op_flags (only those
+ * that are related to map operations).
+ * @gpu_va: GPU address assigned when mapping to the VM.
+ * If gpu_va == PANTHOR_VM_KERNEL_AUTO_VA, the virtual address will be
+ * automatically allocated.
+ *
+ * Return: A valid pointer in case of success, an ERR_PTR() otherwise.
+ */
+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)
+{
+	struct drm_gem_shmem_object *obj;
+	struct panthor_kernel_bo *kbo;
+	struct panthor_gem_object *bo;
+	int ret;
+
+	if (drm_WARN_ON(&ptdev->base, !vm))
+		return ERR_PTR(-EINVAL);
+
+	kbo = kzalloc(sizeof(*kbo), GFP_KERNEL);
+	if (!kbo)
+		return ERR_PTR(-ENOMEM);
+
+	obj = drm_gem_shmem_create(&ptdev->base, size);
+	if (IS_ERR(obj)) {
+		ret = PTR_ERR(obj);
+		goto err_free_bo;
+	}
+
+	bo = to_panthor_bo(&obj->base);
+	size = obj->base.size;
+	kbo->obj = &obj->base;
+	bo->flags = bo_flags;
+
+	ret = panthor_vm_alloc_va(vm, gpu_va, size, &kbo->va_node);
+	if (ret)
+		goto err_put_obj;
+
+	ret = panthor_vm_map_bo_range(vm, bo, 0, size, kbo->va_node.start, vm_map_flags);
+	if (ret)
+		goto err_free_va;
+
+	kbo->vm = panthor_vm_get(vm);
+	bo->exclusive_vm_root_gem = panthor_vm_root_gem(vm);
+	drm_gem_object_get(bo->exclusive_vm_root_gem);
+	bo->base.base.resv = bo->exclusive_vm_root_gem->resv;
+	return kbo;
+
+err_free_va:
+	panthor_vm_free_va(vm, &kbo->va_node);
+
+err_put_obj:
+	drm_gem_object_put(&obj->base);
+
+err_free_bo:
+	kfree(kbo);
+	return ERR_PTR(ret);
+}
+
+static int panthor_gem_mmap(struct drm_gem_object *obj, struct vm_area_struct *vma)
+{
+	struct panthor_gem_object *bo = to_panthor_bo(obj);
+
+	/* Don't allow mmap on objects that have the NO_MMAP flag set. */
+	if (bo->flags & DRM_PANTHOR_BO_NO_MMAP)
+		return -EINVAL;
+
+	return drm_gem_shmem_object_mmap(obj, vma);
+}
+
+static struct dma_buf *
+panthor_gem_prime_export(struct drm_gem_object *obj, int flags)
+{
+	/* We can't export GEMs that have an exclusive VM. */
+	if (to_panthor_bo(obj)->exclusive_vm_root_gem)
+		return ERR_PTR(-EINVAL);
+
+	return drm_gem_prime_export(obj, flags);
+}
+
+static const struct drm_gem_object_funcs panthor_gem_funcs = {
+	.free = panthor_gem_free_object,
+	.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 = panthor_gem_mmap,
+	.export = panthor_gem_prime_export,
+	.vm_ops = &drm_gem_shmem_vm_ops,
+};
+
+/**
+ * panthor_gem_create_object - Implementation of driver->gem_create_object.
+ * @ddev: DRM device
+ * @size: Size in bytes of the memory the object will reference
+ *
+ * This lets the GEM helpers allocate object structs for us, and keep
+ * our BO stats correct.
+ */
+struct drm_gem_object *panthor_gem_create_object(struct drm_device *ddev, size_t size)
+{
+	struct panthor_device *ptdev = container_of(ddev, struct panthor_device, base);
+	struct panthor_gem_object *obj;
+
+	obj = kzalloc(sizeof(*obj), GFP_KERNEL);
+	if (!obj)
+		return ERR_PTR(-ENOMEM);
+
+	obj->base.base.funcs = &panthor_gem_funcs;
+	obj->base.map_wc = !ptdev->coherent;
+	mutex_init(&obj->gpuva_list_lock);
+	drm_gem_gpuva_set_lock(&obj->base.base, &obj->gpuva_list_lock);
+
+	return &obj->base.base;
+}
+
+/**
+ * panthor_gem_create_with_handle() - Create a GEM object and attach it to a handle.
+ * @file: DRM file.
+ * @ddev: DRM device.
+ * @exclusive_vm: Exclusive VM. Not NULL if the GEM object can't be shared.
+ * @size: Size of the GEM object to allocate.
+ * @flags: Combination of drm_panthor_bo_flags flags.
+ * @handle: Pointer holding the handle pointing to the new GEM object.
+ *
+ * Return: Zero on success
+ */
+int
+panthor_gem_create_with_handle(struct drm_file *file,
+			       struct drm_device *ddev,
+			       struct panthor_vm *exclusive_vm,
+			       u64 *size, u32 flags, u32 *handle)
+{
+	int ret;
+	struct drm_gem_shmem_object *shmem;
+	struct panthor_gem_object *bo;
+
+	shmem = drm_gem_shmem_create(ddev, *size);
+	if (IS_ERR(shmem))
+		return PTR_ERR(shmem);
+
+	bo = to_panthor_bo(&shmem->base);
+	bo->flags = flags;
+
+	if (exclusive_vm) {
+		bo->exclusive_vm_root_gem = panthor_vm_root_gem(exclusive_vm);
+		drm_gem_object_get(bo->exclusive_vm_root_gem);
+		bo->base.base.resv = bo->exclusive_vm_root_gem->resv;
+	}
+
+	/*
+	 * Allocate an id of idr table where the obj is registered
+	 * and handle has the id what user can see.
+	 */
+	ret = drm_gem_handle_create(file, &shmem->base, handle);
+	if (!ret)
+		*size = bo->base.base.size;
+
+	/* drop reference from allocate - handle holds it now. */
+	drm_gem_object_put(&shmem->base);
+
+	return ret;
+}