pvr_gem.h

  1/* SPDX-License-Identifier: GPL-2.0-only OR MIT */
  2/* Copyright (c) 2023 Imagination Technologies Ltd. */
  3
  4#ifndef PVR_GEM_H
  5#define PVR_GEM_H
  6
  7#include "pvr_rogue_heap_config.h"
  8#include "pvr_rogue_meta.h"
  9
 10#include <uapi/drm/pvr_drm.h>
 11
 12#include <drm/drm_gem.h>
 13#include <drm/drm_gem_shmem_helper.h>
 14#include <drm/drm_mm.h>
 15
 16#include <linux/bitfield.h>
 17#include <linux/bits.h>
 18#include <linux/const.h>
 19#include <linux/compiler_attributes.h>
 20#include <linux/kernel.h>
 21#include <linux/mutex.h>
 22#include <linux/refcount.h>
 23#include <linux/scatterlist.h>
 24#include <linux/sizes.h>
 25#include <linux/types.h>
 26
 27/* Forward declaration from "pvr_device.h". */
 28struct pvr_device;
 29struct pvr_file;
 30
 31/**
 32 * DOC: Flags for DRM_IOCTL_PVR_CREATE_BO (kernel-only)
 33 *
 34 * Kernel-only values allowed in &pvr_gem_object->flags. The majority of options
 35 * for this field are specified in the UAPI header "pvr_drm.h" with a
 36 * DRM_PVR_BO_ prefix. To distinguish these internal options (which must exist
 37 * in ranges marked as "reserved" in the UAPI header), we drop the DRM prefix.
 38 * The public options should be used directly, DRM prefix and all.
 39 *
 40 * To avoid potentially confusing gaps in the UAPI options, these kernel-only
 41 * options are specified "in reverse", starting at bit 63.
 42 *
 43 * We use "reserved" to refer to bits defined here and not exposed in the UAPI.
 44 * Bits not defined anywhere are "undefined".
 45 *
 46 * CPU mapping options
 47 *    :PVR_BO_CPU_CACHED: By default, all GEM objects are mapped write-combined on the CPU. Set
 48 *       this flag to override this behaviour and map the object cached. If the dma_coherent
 49 *       property is present in devicetree, all allocations will be mapped as if this flag was set.
 50 *       This does not require any additional consideration at allocation time.
 51 *
 52 * Firmware options
 53 *    :PVR_BO_FW_NO_CLEAR_ON_RESET: By default, all FW objects are cleared and reinitialised on hard
 54 *       reset. Set this flag to override this behaviour and preserve buffer contents on reset.
 55 */
 56#define PVR_BO_CPU_CACHED BIT_ULL(63)
 57
 58#define PVR_BO_FW_NO_CLEAR_ON_RESET BIT_ULL(62)
 59
 60#define PVR_BO_KERNEL_FLAGS_MASK (PVR_BO_CPU_CACHED | PVR_BO_FW_NO_CLEAR_ON_RESET)
 61
 62/* Bits 61..3 are undefined. */
 63/* Bits 2..0 are defined in the UAPI. */
 64
 65/* Other utilities. */
 66#define PVR_BO_UNDEFINED_MASK ~(PVR_BO_KERNEL_FLAGS_MASK | DRM_PVR_BO_FLAGS_MASK)
 67
 68/*
 69 * All firmware-mapped memory uses (mostly) the same flags. Specifically,
 70 * firmware-mapped memory should be:
 71 *  * Read/write on the device,
 72 *  * Read/write on the CPU, and
 73 *  * Write-combined on the CPU.
 74 *
 75 * The only variation is in caching on the device.
 76 */
 77#define PVR_BO_FW_FLAGS_DEVICE_CACHED (ULL(0))
 78#define PVR_BO_FW_FLAGS_DEVICE_UNCACHED DRM_PVR_BO_BYPASS_DEVICE_CACHE
 79
 80/**
 81 * struct pvr_gem_object - powervr-specific wrapper for &struct drm_gem_object
 82 */
 83struct pvr_gem_object {
 84	/**
 85	 * @base: The underlying &struct drm_gem_shmem_object.
 86	 *
 87	 * Do not access this member directly, instead call
 88	 * shem_gem_from_pvr_gem().
 89	 */
 90	struct drm_gem_shmem_object base;
 91
 92	/**
 93	 * @flags: Options set at creation-time. Some of these options apply to
 94	 * the creation operation itself (which are stored here for reference)
 95	 * with the remainder used for mapping options to both the device and
 96	 * CPU. These are used every time this object is mapped, but may be
 97	 * changed after creation.
 98	 *
 99	 * Must be a combination of DRM_PVR_BO_* and/or PVR_BO_* flags.
100	 *
101	 * .. note::
102	 *
103	 *    This member is declared const to indicate that none of these
104	 *    options may change or be changed throughout the object's
105	 *    lifetime.
106	 */
107	u64 flags;
108
109};
110
111static_assert(offsetof(struct pvr_gem_object, base) == 0,
112	      "offsetof(struct pvr_gem_object, base) not zero");
113
114#define shmem_gem_from_pvr_gem(pvr_obj) (&(pvr_obj)->base)
115
116#define shmem_gem_to_pvr_gem(shmem_obj) container_of_const(shmem_obj, struct pvr_gem_object, base)
117
118#define gem_from_pvr_gem(pvr_obj) (&(pvr_obj)->base.base)
119
120#define gem_to_pvr_gem(gem_obj) container_of_const(gem_obj, struct pvr_gem_object, base.base)
121
122/* Functions defined in pvr_gem.c */
123
124struct drm_gem_object *pvr_gem_create_object(struct drm_device *drm_dev, size_t size);
125
126struct pvr_gem_object *pvr_gem_object_create(struct pvr_device *pvr_dev,
127					     size_t size, u64 flags);
128
129int pvr_gem_object_into_handle(struct pvr_gem_object *pvr_obj,
130			       struct pvr_file *pvr_file, u32 *handle);
131struct pvr_gem_object *pvr_gem_object_from_handle(struct pvr_file *pvr_file,
132						  u32 handle);
133
134static __always_inline struct sg_table *
135pvr_gem_object_get_pages_sgt(struct pvr_gem_object *pvr_obj)
136{
137	return drm_gem_shmem_get_pages_sgt(shmem_gem_from_pvr_gem(pvr_obj));
138}
139
140void *pvr_gem_object_vmap(struct pvr_gem_object *pvr_obj);
141void pvr_gem_object_vunmap(struct pvr_gem_object *pvr_obj);
142
143int pvr_gem_get_dma_addr(struct pvr_gem_object *pvr_obj, u32 offset,
144			 dma_addr_t *dma_addr_out);
145
146/**
147 * pvr_gem_object_get() - Acquire reference on pvr_gem_object
148 * @pvr_obj: Pointer to object to acquire reference on.
149 */
150static __always_inline void
151pvr_gem_object_get(struct pvr_gem_object *pvr_obj)
152{
153	drm_gem_object_get(gem_from_pvr_gem(pvr_obj));
154}
155
156/**
157 * pvr_gem_object_put() - Release reference on pvr_gem_object
158 * @pvr_obj: Pointer to object to release reference on.
159 */
160static __always_inline void
161pvr_gem_object_put(struct pvr_gem_object *pvr_obj)
162{
163	drm_gem_object_put(gem_from_pvr_gem(pvr_obj));
164}
165
166static __always_inline size_t
167pvr_gem_object_size(struct pvr_gem_object *pvr_obj)
168{
169	return gem_from_pvr_gem(pvr_obj)->size;
170}
171
172#endif /* PVR_GEM_H */