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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
commit2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch)
tree848558de17fb3008cdf4d861b01ac7781903ce39 /include/drm/drm_gem.h
parentInitial commit. (diff)
downloadlinux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz
linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip
Adding upstream version 6.1.76.upstream/6.1.76upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'include/drm/drm_gem.h')
-rw-r--r--include/drm/drm_gem.h480
1 files changed, 480 insertions, 0 deletions
diff --git a/include/drm/drm_gem.h b/include/drm/drm_gem.h
new file mode 100644
index 000000000..60b2dda8d
--- /dev/null
+++ b/include/drm/drm_gem.h
@@ -0,0 +1,480 @@
+#ifndef __DRM_GEM_H__
+#define __DRM_GEM_H__
+
+/*
+ * GEM Graphics Execution Manager Driver Interfaces
+ *
+ * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
+ * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
+ * Copyright (c) 2009-2010, Code Aurora Forum.
+ * All rights reserved.
+ * Copyright © 2014 Intel Corporation
+ * Daniel Vetter <daniel.vetter@ffwll.ch>
+ *
+ * Author: Rickard E. (Rik) Faith <faith@valinux.com>
+ * Author: Gareth Hughes <gareth@valinux.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#include <linux/kref.h>
+#include <linux/dma-resv.h>
+
+#include <drm/drm_vma_manager.h>
+
+struct iosys_map;
+struct drm_gem_object;
+
+/**
+ * struct drm_gem_object_funcs - GEM object functions
+ */
+struct drm_gem_object_funcs {
+ /**
+ * @free:
+ *
+ * Deconstructor for drm_gem_objects.
+ *
+ * This callback is mandatory.
+ */
+ void (*free)(struct drm_gem_object *obj);
+
+ /**
+ * @open:
+ *
+ * Called upon GEM handle creation.
+ *
+ * This callback is optional.
+ */
+ int (*open)(struct drm_gem_object *obj, struct drm_file *file);
+
+ /**
+ * @close:
+ *
+ * Called upon GEM handle release.
+ *
+ * This callback is optional.
+ */
+ void (*close)(struct drm_gem_object *obj, struct drm_file *file);
+
+ /**
+ * @print_info:
+ *
+ * If driver subclasses struct &drm_gem_object, it can implement this
+ * optional hook for printing additional driver specific info.
+ *
+ * drm_printf_indent() should be used in the callback passing it the
+ * indent argument.
+ *
+ * This callback is called from drm_gem_print_info().
+ *
+ * This callback is optional.
+ */
+ void (*print_info)(struct drm_printer *p, unsigned int indent,
+ const struct drm_gem_object *obj);
+
+ /**
+ * @export:
+ *
+ * Export backing buffer as a &dma_buf.
+ * If this is not set drm_gem_prime_export() is used.
+ *
+ * This callback is optional.
+ */
+ struct dma_buf *(*export)(struct drm_gem_object *obj, int flags);
+
+ /**
+ * @pin:
+ *
+ * Pin backing buffer in memory. Used by the drm_gem_map_attach() helper.
+ *
+ * This callback is optional.
+ */
+ int (*pin)(struct drm_gem_object *obj);
+
+ /**
+ * @unpin:
+ *
+ * Unpin backing buffer. Used by the drm_gem_map_detach() helper.
+ *
+ * This callback is optional.
+ */
+ void (*unpin)(struct drm_gem_object *obj);
+
+ /**
+ * @get_sg_table:
+ *
+ * Returns a Scatter-Gather table representation of the buffer.
+ * Used when exporting a buffer by the drm_gem_map_dma_buf() helper.
+ * Releasing is done by calling dma_unmap_sg_attrs() and sg_free_table()
+ * in drm_gem_unmap_buf(), therefore these helpers and this callback
+ * here cannot be used for sg tables pointing at driver private memory
+ * ranges.
+ *
+ * See also drm_prime_pages_to_sg().
+ */
+ struct sg_table *(*get_sg_table)(struct drm_gem_object *obj);
+
+ /**
+ * @vmap:
+ *
+ * Returns a virtual address for the buffer. Used by the
+ * drm_gem_dmabuf_vmap() helper.
+ *
+ * This callback is optional.
+ */
+ int (*vmap)(struct drm_gem_object *obj, struct iosys_map *map);
+
+ /**
+ * @vunmap:
+ *
+ * Releases the address previously returned by @vmap. Used by the
+ * drm_gem_dmabuf_vunmap() helper.
+ *
+ * This callback is optional.
+ */
+ void (*vunmap)(struct drm_gem_object *obj, struct iosys_map *map);
+
+ /**
+ * @mmap:
+ *
+ * Handle mmap() of the gem object, setup vma accordingly.
+ *
+ * This callback is optional.
+ *
+ * The callback is used by both drm_gem_mmap_obj() and
+ * drm_gem_prime_mmap(). When @mmap is present @vm_ops is not
+ * used, the @mmap callback must set vma->vm_ops instead.
+ */
+ int (*mmap)(struct drm_gem_object *obj, struct vm_area_struct *vma);
+
+ /**
+ * @vm_ops:
+ *
+ * Virtual memory operations used with mmap.
+ *
+ * This is optional but necessary for mmap support.
+ */
+ const struct vm_operations_struct *vm_ops;
+};
+
+/**
+ * struct drm_gem_lru - A simple LRU helper
+ *
+ * A helper for tracking GEM objects in a given state, to aid in
+ * driver's shrinker implementation. Tracks the count of pages
+ * for lockless &shrinker.count_objects, and provides
+ * &drm_gem_lru_scan for driver's &shrinker.scan_objects
+ * implementation.
+ */
+struct drm_gem_lru {
+ /**
+ * @lock:
+ *
+ * Lock protecting movement of GEM objects between LRUs. All
+ * LRUs that the object can move between should be protected
+ * by the same lock.
+ */
+ struct mutex *lock;
+
+ /**
+ * @count:
+ *
+ * The total number of backing pages of the GEM objects in
+ * this LRU.
+ */
+ long count;
+
+ /**
+ * @list:
+ *
+ * The LRU list.
+ */
+ struct list_head list;
+};
+
+/**
+ * struct drm_gem_object - GEM buffer object
+ *
+ * This structure defines the generic parts for GEM buffer objects, which are
+ * mostly around handling mmap and userspace handles.
+ *
+ * Buffer objects are often abbreviated to BO.
+ */
+struct drm_gem_object {
+ /**
+ * @refcount:
+ *
+ * Reference count of this object
+ *
+ * Please use drm_gem_object_get() to acquire and drm_gem_object_put_locked()
+ * or drm_gem_object_put() to release a reference to a GEM
+ * buffer object.
+ */
+ struct kref refcount;
+
+ /**
+ * @handle_count:
+ *
+ * This is the GEM file_priv handle count of this object.
+ *
+ * Each handle also holds a reference. Note that when the handle_count
+ * drops to 0 any global names (e.g. the id in the flink namespace) will
+ * be cleared.
+ *
+ * Protected by &drm_device.object_name_lock.
+ */
+ unsigned handle_count;
+
+ /**
+ * @dev: DRM dev this object belongs to.
+ */
+ struct drm_device *dev;
+
+ /**
+ * @filp:
+ *
+ * SHMEM file node used as backing storage for swappable buffer objects.
+ * GEM also supports driver private objects with driver-specific backing
+ * storage (contiguous DMA memory, special reserved blocks). In this
+ * case @filp is NULL.
+ */
+ struct file *filp;
+
+ /**
+ * @vma_node:
+ *
+ * Mapping info for this object to support mmap. Drivers are supposed to
+ * allocate the mmap offset using drm_gem_create_mmap_offset(). The
+ * offset itself can be retrieved using drm_vma_node_offset_addr().
+ *
+ * Memory mapping itself is handled by drm_gem_mmap(), which also checks
+ * that userspace is allowed to access the object.
+ */
+ struct drm_vma_offset_node vma_node;
+
+ /**
+ * @size:
+ *
+ * Size of the object, in bytes. Immutable over the object's
+ * lifetime.
+ */
+ size_t size;
+
+ /**
+ * @name:
+ *
+ * Global name for this object, starts at 1. 0 means unnamed.
+ * Access is covered by &drm_device.object_name_lock. This is used by
+ * the GEM_FLINK and GEM_OPEN ioctls.
+ */
+ int name;
+
+ /**
+ * @dma_buf:
+ *
+ * dma-buf associated with this GEM object.
+ *
+ * Pointer to the dma-buf associated with this gem object (either
+ * through importing or exporting). We break the resulting reference
+ * loop when the last gem handle for this object is released.
+ *
+ * Protected by &drm_device.object_name_lock.
+ */
+ struct dma_buf *dma_buf;
+
+ /**
+ * @import_attach:
+ *
+ * dma-buf attachment backing this object.
+ *
+ * Any foreign dma_buf imported as a gem object has this set to the
+ * attachment point for the device. This is invariant over the lifetime
+ * of a gem object.
+ *
+ * The &drm_gem_object_funcs.free callback is responsible for
+ * cleaning up the dma_buf attachment and references acquired at import
+ * time.
+ *
+ * Note that the drm gem/prime core does not depend upon drivers setting
+ * this field any more. So for drivers where this doesn't make sense
+ * (e.g. virtual devices or a displaylink behind an usb bus) they can
+ * simply leave it as NULL.
+ */
+ struct dma_buf_attachment *import_attach;
+
+ /**
+ * @resv:
+ *
+ * Pointer to reservation object associated with the this GEM object.
+ *
+ * Normally (@resv == &@_resv) except for imported GEM objects.
+ */
+ struct dma_resv *resv;
+
+ /**
+ * @_resv:
+ *
+ * A reservation object for this GEM object.
+ *
+ * This is unused for imported GEM objects.
+ */
+ struct dma_resv _resv;
+
+ /**
+ * @funcs:
+ *
+ * Optional GEM object functions. If this is set, it will be used instead of the
+ * corresponding &drm_driver GEM callbacks.
+ *
+ * New drivers should use this.
+ *
+ */
+ const struct drm_gem_object_funcs *funcs;
+
+ /**
+ * @lru_node:
+ *
+ * List node in a &drm_gem_lru.
+ */
+ struct list_head lru_node;
+
+ /**
+ * @lru:
+ *
+ * The current LRU list that the GEM object is on.
+ */
+ struct drm_gem_lru *lru;
+};
+
+/**
+ * DRM_GEM_FOPS - Default drm GEM file operations
+ *
+ * This macro provides a shorthand for setting the GEM file ops in the
+ * &file_operations structure. If all you need are the default ops, use
+ * DEFINE_DRM_GEM_FOPS instead.
+ */
+#define DRM_GEM_FOPS \
+ .open = drm_open,\
+ .release = drm_release,\
+ .unlocked_ioctl = drm_ioctl,\
+ .compat_ioctl = drm_compat_ioctl,\
+ .poll = drm_poll,\
+ .read = drm_read,\
+ .llseek = noop_llseek,\
+ .mmap = drm_gem_mmap
+
+/**
+ * DEFINE_DRM_GEM_FOPS() - macro to generate file operations for GEM drivers
+ * @name: name for the generated structure
+ *
+ * This macro autogenerates a suitable &struct file_operations for GEM based
+ * drivers, which can be assigned to &drm_driver.fops. Note that this structure
+ * cannot be shared between drivers, because it contains a reference to the
+ * current module using THIS_MODULE.
+ *
+ * Note that the declaration is already marked as static - if you need a
+ * non-static version of this you're probably doing it wrong and will break the
+ * THIS_MODULE reference by accident.
+ */
+#define DEFINE_DRM_GEM_FOPS(name) \
+ static const struct file_operations name = {\
+ .owner = THIS_MODULE,\
+ DRM_GEM_FOPS,\
+ }
+
+void drm_gem_object_release(struct drm_gem_object *obj);
+void drm_gem_object_free(struct kref *kref);
+int drm_gem_object_init(struct drm_device *dev,
+ struct drm_gem_object *obj, size_t size);
+void drm_gem_private_object_init(struct drm_device *dev,
+ struct drm_gem_object *obj, size_t size);
+void drm_gem_vm_open(struct vm_area_struct *vma);
+void drm_gem_vm_close(struct vm_area_struct *vma);
+int drm_gem_mmap_obj(struct drm_gem_object *obj, unsigned long obj_size,
+ struct vm_area_struct *vma);
+int drm_gem_mmap(struct file *filp, struct vm_area_struct *vma);
+
+/**
+ * drm_gem_object_get - acquire a GEM buffer object reference
+ * @obj: GEM buffer object
+ *
+ * This function acquires an additional reference to @obj. It is illegal to
+ * call this without already holding a reference. No locks required.
+ */
+static inline void drm_gem_object_get(struct drm_gem_object *obj)
+{
+ kref_get(&obj->refcount);
+}
+
+__attribute__((nonnull))
+static inline void
+__drm_gem_object_put(struct drm_gem_object *obj)
+{
+ kref_put(&obj->refcount, drm_gem_object_free);
+}
+
+/**
+ * drm_gem_object_put - drop a GEM buffer object reference
+ * @obj: GEM buffer object
+ *
+ * This releases a reference to @obj.
+ */
+static inline void
+drm_gem_object_put(struct drm_gem_object *obj)
+{
+ if (obj)
+ __drm_gem_object_put(obj);
+}
+
+int drm_gem_handle_create(struct drm_file *file_priv,
+ struct drm_gem_object *obj,
+ u32 *handlep);
+int drm_gem_handle_delete(struct drm_file *filp, u32 handle);
+
+
+void drm_gem_free_mmap_offset(struct drm_gem_object *obj);
+int drm_gem_create_mmap_offset(struct drm_gem_object *obj);
+int drm_gem_create_mmap_offset_size(struct drm_gem_object *obj, size_t size);
+
+struct page **drm_gem_get_pages(struct drm_gem_object *obj);
+void drm_gem_put_pages(struct drm_gem_object *obj, struct page **pages,
+ bool dirty, bool accessed);
+
+int drm_gem_objects_lookup(struct drm_file *filp, void __user *bo_handles,
+ int count, struct drm_gem_object ***objs_out);
+struct drm_gem_object *drm_gem_object_lookup(struct drm_file *filp, u32 handle);
+long drm_gem_dma_resv_wait(struct drm_file *filep, u32 handle,
+ bool wait_all, unsigned long timeout);
+int drm_gem_lock_reservations(struct drm_gem_object **objs, int count,
+ struct ww_acquire_ctx *acquire_ctx);
+void drm_gem_unlock_reservations(struct drm_gem_object **objs, int count,
+ struct ww_acquire_ctx *acquire_ctx);
+int drm_gem_dumb_map_offset(struct drm_file *file, struct drm_device *dev,
+ u32 handle, u64 *offset);
+
+void drm_gem_lru_init(struct drm_gem_lru *lru, struct mutex *lock);
+void drm_gem_lru_remove(struct drm_gem_object *obj);
+void drm_gem_lru_move_tail(struct drm_gem_lru *lru, struct drm_gem_object *obj);
+unsigned long drm_gem_lru_scan(struct drm_gem_lru *lru,
+ unsigned int nr_to_scan,
+ unsigned long *remaining,
+ bool (*shrink)(struct drm_gem_object *obj));
+
+#endif /* __DRM_GEM_H__ */