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/* SPDX-License-Identifier: MIT */
/*
* Copyright © 2021 Intel Corporation
*/
#ifndef _I915_VMA_SNAPSHOT_H_
#define _I915_VMA_SNAPSHOT_H_
#include <linux/kref.h>
#include <linux/slab.h>
#include <linux/types.h>
struct i915_active;
struct i915_refct_sgt;
struct i915_vma;
struct intel_memory_region;
struct sg_table;
/**
* DOC: Simple utilities for snapshotting GPU vma metadata, later used for
* error capture. Vi use a separate header for this to avoid issues due to
* recursive header includes.
*/
/**
* struct i915_vma_snapshot - Snapshot of vma metadata.
* @size: The vma size in bytes.
* @obj_size: The size of the underlying object in bytes.
* @gtt_offset: The gtt offset the vma is bound to.
* @gtt_size: The size in bytes allocated for the vma in the GTT.
* @pages: The struct sg_table pointing to the pages bound.
* @pages_rsgt: The refcounted sg_table holding the reference for @pages if any.
* @mr: The memory region pointed for the pages bound.
* @kref: Reference for this structure.
* @vma_resource: FIXME: A means to keep the unbind fence from signaling.
* Temporarily while we have only sync unbinds, and still use the vma
* active, we use that. With async unbinding we need a signaling refcount
* for the unbind fence.
* @page_sizes: The vma GTT page sizes information.
* @onstack: Whether the structure shouldn't be freed on final put.
* @present: Whether the structure is present and initialized.
*/
struct i915_vma_snapshot {
const char *name;
size_t size;
size_t obj_size;
size_t gtt_offset;
size_t gtt_size;
struct sg_table *pages;
struct i915_refct_sgt *pages_rsgt;
struct intel_memory_region *mr;
struct kref kref;
struct i915_active *vma_resource;
u32 page_sizes;
bool onstack:1;
bool present:1;
};
void i915_vma_snapshot_init(struct i915_vma_snapshot *vsnap,
struct i915_vma *vma,
const char *name);
void i915_vma_snapshot_init_onstack(struct i915_vma_snapshot *vsnap,
struct i915_vma *vma,
const char *name);
void i915_vma_snapshot_put(struct i915_vma_snapshot *vsnap);
void i915_vma_snapshot_put_onstack(struct i915_vma_snapshot *vsnap);
bool i915_vma_snapshot_resource_pin(struct i915_vma_snapshot *vsnap,
bool *lockdep_cookie);
void i915_vma_snapshot_resource_unpin(struct i915_vma_snapshot *vsnap,
bool lockdep_cookie);
/**
* i915_vma_snapshot_alloc - Allocate a struct i915_vma_snapshot
* @gfp: Allocation mode.
*
* Return: A pointer to a struct i915_vma_snapshot if successful.
* NULL otherwise.
*/
static inline struct i915_vma_snapshot *i915_vma_snapshot_alloc(gfp_t gfp)
{
return kmalloc(sizeof(struct i915_vma_snapshot), gfp);
}
/**
* i915_vma_snapshot_get - Take a reference on a struct i915_vma_snapshot
*
* Return: A pointer to a struct i915_vma_snapshot.
*/
static inline struct i915_vma_snapshot *
i915_vma_snapshot_get(struct i915_vma_snapshot *vsnap)
{
kref_get(&vsnap->kref);
return vsnap;
}
/**
* i915_vma_snapshot_present - Whether a struct i915_vma_snapshot is
* present and initialized.
*
* Return: true if present and initialized; false otherwise.
*/
static inline bool
i915_vma_snapshot_present(const struct i915_vma_snapshot *vsnap)
{
return vsnap && vsnap->present;
}
#endif
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