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![Ville Syrjälä](/assets/img/avatar_default.png)
A bunch of files have a stray newline at the end. Remove it. Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20210318181039.17260-2-ville.syrjala@linux.intel.com Reviewed-by: Imre Deak <imre.deak@intel.com>
288 lines
9.6 KiB
C
288 lines
9.6 KiB
C
/* SPDX-License-Identifier: MIT */
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/*
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* Copyright © 2016 Intel Corporation
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*
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*/
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#ifndef __I915_VMA_TYPES_H__
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#define __I915_VMA_TYPES_H__
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#include <linux/rbtree.h>
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#include <drm/drm_mm.h>
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#include "gem/i915_gem_object_types.h"
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enum i915_cache_level;
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/**
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* DOC: Global GTT views
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*
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* Background and previous state
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*
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* Historically objects could exists (be bound) in global GTT space only as
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* singular instances with a view representing all of the object's backing pages
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* in a linear fashion. This view will be called a normal view.
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*
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* To support multiple views of the same object, where the number of mapped
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* pages is not equal to the backing store, or where the layout of the pages
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* is not linear, concept of a GGTT view was added.
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*
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* One example of an alternative view is a stereo display driven by a single
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* image. In this case we would have a framebuffer looking like this
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* (2x2 pages):
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*
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* 12
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* 34
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*
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* Above would represent a normal GGTT view as normally mapped for GPU or CPU
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* rendering. In contrast, fed to the display engine would be an alternative
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* view which could look something like this:
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*
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* 1212
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* 3434
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*
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* In this example both the size and layout of pages in the alternative view is
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* different from the normal view.
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*
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* Implementation and usage
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*
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* GGTT views are implemented using VMAs and are distinguished via enum
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* i915_ggtt_view_type and struct i915_ggtt_view.
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*
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* A new flavour of core GEM functions which work with GGTT bound objects were
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* added with the _ggtt_ infix, and sometimes with _view postfix to avoid
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* renaming in large amounts of code. They take the struct i915_ggtt_view
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* parameter encapsulating all metadata required to implement a view.
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*
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* As a helper for callers which are only interested in the normal view,
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* globally const i915_ggtt_view_normal singleton instance exists. All old core
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* GEM API functions, the ones not taking the view parameter, are operating on,
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* or with the normal GGTT view.
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*
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* Code wanting to add or use a new GGTT view needs to:
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*
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* 1. Add a new enum with a suitable name.
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* 2. Extend the metadata in the i915_ggtt_view structure if required.
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* 3. Add support to i915_get_vma_pages().
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*
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* New views are required to build a scatter-gather table from within the
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* i915_get_vma_pages function. This table is stored in the vma.ggtt_view and
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* exists for the lifetime of an VMA.
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*
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* Core API is designed to have copy semantics which means that passed in
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* struct i915_ggtt_view does not need to be persistent (left around after
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* calling the core API functions).
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*
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*/
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struct intel_remapped_plane_info {
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/* in gtt pages */
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u32 offset;
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u16 width;
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u16 height;
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u16 src_stride;
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u16 dst_stride;
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} __packed;
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struct intel_remapped_info {
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struct intel_remapped_plane_info plane[2];
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u32 unused_mbz;
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} __packed;
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struct intel_rotation_info {
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struct intel_remapped_plane_info plane[2];
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} __packed;
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struct intel_partial_info {
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u64 offset;
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unsigned int size;
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} __packed;
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enum i915_ggtt_view_type {
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I915_GGTT_VIEW_NORMAL = 0,
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I915_GGTT_VIEW_ROTATED = sizeof(struct intel_rotation_info),
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I915_GGTT_VIEW_PARTIAL = sizeof(struct intel_partial_info),
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I915_GGTT_VIEW_REMAPPED = sizeof(struct intel_remapped_info),
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};
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static inline void assert_i915_gem_gtt_types(void)
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{
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BUILD_BUG_ON(sizeof(struct intel_rotation_info) != 2 * sizeof(u32) + 8 * sizeof(u16));
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BUILD_BUG_ON(sizeof(struct intel_partial_info) != sizeof(u64) + sizeof(unsigned int));
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BUILD_BUG_ON(sizeof(struct intel_remapped_info) != 3 * sizeof(u32) + 8 * sizeof(u16));
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/* Check that rotation/remapped shares offsets for simplicity */
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BUILD_BUG_ON(offsetof(struct intel_remapped_info, plane[0]) !=
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offsetof(struct intel_rotation_info, plane[0]));
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BUILD_BUG_ON(offsetofend(struct intel_remapped_info, plane[1]) !=
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offsetofend(struct intel_rotation_info, plane[1]));
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/* As we encode the size of each branch inside the union into its type,
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* we have to be careful that each branch has a unique size.
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*/
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switch ((enum i915_ggtt_view_type)0) {
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case I915_GGTT_VIEW_NORMAL:
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case I915_GGTT_VIEW_PARTIAL:
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case I915_GGTT_VIEW_ROTATED:
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case I915_GGTT_VIEW_REMAPPED:
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/* gcc complains if these are identical cases */
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break;
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}
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}
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struct i915_ggtt_view {
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enum i915_ggtt_view_type type;
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union {
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/* Members need to contain no holes/padding */
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struct intel_partial_info partial;
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struct intel_rotation_info rotated;
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struct intel_remapped_info remapped;
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};
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};
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/**
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* DOC: Virtual Memory Address
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*
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* A VMA represents a GEM BO that is bound into an address space. Therefore, a
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* VMA's presence cannot be guaranteed before binding, or after unbinding the
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* object into/from the address space.
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*
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* To make things as simple as possible (ie. no refcounting), a VMA's lifetime
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* will always be <= an objects lifetime. So object refcounting should cover us.
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*/
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struct i915_vma {
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struct drm_mm_node node;
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struct i915_address_space *vm;
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const struct i915_vma_ops *ops;
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struct drm_i915_gem_object *obj;
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struct dma_resv *resv; /** Alias of obj->resv */
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struct sg_table *pages;
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void __iomem *iomap;
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void *private; /* owned by creator */
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struct i915_fence_reg *fence;
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u64 size;
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u64 display_alignment;
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struct i915_page_sizes page_sizes;
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/* mmap-offset associated with fencing for this vma */
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struct i915_mmap_offset *mmo;
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u32 fence_size;
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u32 fence_alignment;
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/**
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* Count of the number of times this vma has been opened by different
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* handles (but same file) for execbuf, i.e. the number of aliases
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* that exist in the ctx->handle_vmas LUT for this vma.
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*/
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struct kref ref;
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atomic_t open_count;
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atomic_t flags;
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/**
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* How many users have pinned this object in GTT space.
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*
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* This is a tightly bound, fairly small number of users, so we
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* stuff inside the flags field so that we can both check for overflow
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* and detect a no-op i915_vma_pin() in a single check, while also
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* pinning the vma.
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*
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* The worst case display setup would have the same vma pinned for
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* use on each plane on each crtc, while also building the next atomic
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* state and holding a pin for the length of the cleanup queue. In the
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* future, the flip queue may be increased from 1.
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* Estimated worst case: 3 [qlen] * 4 [max crtcs] * 7 [max planes] = 84
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*
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* For GEM, the number of concurrent users for pwrite/pread is
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* unbounded. For execbuffer, it is currently one but will in future
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* be extended to allow multiple clients to pin vma concurrently.
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*
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* We also use suballocated pages, with each suballocation claiming
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* its own pin on the shared vma. At present, this is limited to
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* exclusive cachelines of a single page, so a maximum of 64 possible
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* users.
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*/
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#define I915_VMA_PIN_MASK 0x3ff
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#define I915_VMA_OVERFLOW 0x200
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/** Flags and address space this VMA is bound to */
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#define I915_VMA_GLOBAL_BIND_BIT 10
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#define I915_VMA_LOCAL_BIND_BIT 11
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#define I915_VMA_GLOBAL_BIND ((int)BIT(I915_VMA_GLOBAL_BIND_BIT))
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#define I915_VMA_LOCAL_BIND ((int)BIT(I915_VMA_LOCAL_BIND_BIT))
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#define I915_VMA_BIND_MASK (I915_VMA_GLOBAL_BIND | I915_VMA_LOCAL_BIND)
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#define I915_VMA_ALLOC_BIT 12
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#define I915_VMA_ERROR_BIT 13
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#define I915_VMA_ERROR ((int)BIT(I915_VMA_ERROR_BIT))
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#define I915_VMA_GGTT_BIT 14
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#define I915_VMA_CAN_FENCE_BIT 15
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#define I915_VMA_USERFAULT_BIT 16
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#define I915_VMA_GGTT_WRITE_BIT 17
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#define I915_VMA_GGTT ((int)BIT(I915_VMA_GGTT_BIT))
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#define I915_VMA_CAN_FENCE ((int)BIT(I915_VMA_CAN_FENCE_BIT))
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#define I915_VMA_USERFAULT ((int)BIT(I915_VMA_USERFAULT_BIT))
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#define I915_VMA_GGTT_WRITE ((int)BIT(I915_VMA_GGTT_WRITE_BIT))
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#define I915_VMA_SCANOUT_BIT 18
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#define I915_VMA_SCANOUT ((int)BIT(I915_VMA_SCANOUT_BIT))
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struct i915_active active;
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#define I915_VMA_PAGES_BIAS 24
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#define I915_VMA_PAGES_ACTIVE (BIT(24) | 1)
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atomic_t pages_count; /* number of active binds to the pages */
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struct mutex pages_mutex; /* protect acquire/release of backing pages */
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/**
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* Support different GGTT views into the same object.
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* This means there can be multiple VMA mappings per object and per VM.
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* i915_ggtt_view_type is used to distinguish between those entries.
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* The default one of zero (I915_GGTT_VIEW_NORMAL) is default and also
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* assumed in GEM functions which take no ggtt view parameter.
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*/
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struct i915_ggtt_view ggtt_view;
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/** This object's place on the active/inactive lists */
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struct list_head vm_link;
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struct list_head obj_link; /* Link in the object's VMA list */
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struct rb_node obj_node;
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struct hlist_node obj_hash;
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/** This vma's place in the eviction list */
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struct list_head evict_link;
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struct list_head closed_link;
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};
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#endif
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