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// SPDX-License-Identifier: MIT
/*
* Copyright © 2021 Intel Corporation
*/
#include "i915_vma_snapshot.h"
#include "i915_vma_types.h"
#include "i915_vma.h"
/**
* i915_vma_snapshot_init - Initialize a struct i915_vma_snapshot from
* a struct i915_vma.
* @vsnap: The i915_vma_snapshot to init.
* @vma: A struct i915_vma used to initialize @vsnap.
* @name: Name associated with the snapshot. The character pointer needs to
* stay alive over the lifitime of the shapsot
*/
void i915_vma_snapshot_init(struct i915_vma_snapshot *vsnap,
struct i915_vma *vma,
const char *name)
{
if (!i915_vma_is_pinned(vma))
assert_object_held(vma->obj);
vsnap->name = name;
vsnap->size = vma->size;
vsnap->obj_size = vma->obj->base.size;
vsnap->gtt_offset = vma->node.start;
vsnap->gtt_size = vma->node.size;
vsnap->page_sizes = vma->page_sizes.gtt;
vsnap->pages = vma->pages;
vsnap->pages_rsgt = NULL;
vsnap->mr = NULL;
if (vma->obj->mm.rsgt)
vsnap->pages_rsgt = i915_refct_sgt_get(vma->obj->mm.rsgt);
vsnap->mr = vma->obj->mm.region;
kref_init(&vsnap->kref);
vsnap->vma_resource = &vma->active;
vsnap->onstack = false;
vsnap->present = true;
}
/**
* i915_vma_snapshot_init_onstack - Initialize a struct i915_vma_snapshot from
* a struct i915_vma, but avoid kfreeing it on last put.
* @vsnap: The i915_vma_snapshot to init.
* @vma: A struct i915_vma used to initialize @vsnap.
* @name: Name associated with the snapshot. The character pointer needs to
* stay alive over the lifitime of the shapsot
*/
void i915_vma_snapshot_init_onstack(struct i915_vma_snapshot *vsnap,
struct i915_vma *vma,
const char *name)
{
i915_vma_snapshot_init(vsnap, vma, name);
vsnap->onstack = true;
}
static void vma_snapshot_release(struct kref *ref)
{
struct i915_vma_snapshot *vsnap =
container_of(ref, typeof(*vsnap), kref);
vsnap->present = false;
if (vsnap->pages_rsgt)
i915_refct_sgt_put(vsnap->pages_rsgt);
if (!vsnap->onstack)
kfree(vsnap);
}
/**
* i915_vma_snapshot_put - Put an i915_vma_snapshot pointer reference
* @vsnap: The pointer reference
*/
void i915_vma_snapshot_put(struct i915_vma_snapshot *vsnap)
{
kref_put(&vsnap->kref, vma_snapshot_release);
}
/**
* i915_vma_snapshot_put_onstack - Put an onstcak i915_vma_snapshot pointer
* reference and varify that the structure is released
* @vsnap: The pointer reference
*
* This function is intended to be paired with a i915_vma_init_onstack()
* and should be called before exiting the scope that declared or
* freeing the structure that embedded @vsnap to verify that all references
* have been released.
*/
void i915_vma_snapshot_put_onstack(struct i915_vma_snapshot *vsnap)
{
if (!kref_put(&vsnap->kref, vma_snapshot_release))
GEM_BUG_ON(1);
}
/**
* i915_vma_snapshot_resource_pin - Temporarily block the memory the
* vma snapshot is pointing to from being released.
* @vsnap: The vma snapshot.
* @lockdep_cookie: Pointer to bool needed for lockdep support. This needs
* to be passed to the paired i915_vma_snapshot_resource_unpin.
*
* This function will temporarily try to hold up a fence or similar structure
* and will therefore enter a fence signaling critical section.
*
* Return: true if we succeeded in blocking the memory from being released,
* false otherwise.
*/
bool i915_vma_snapshot_resource_pin(struct i915_vma_snapshot *vsnap,
bool *lockdep_cookie)
{
bool pinned = i915_active_acquire_if_busy(vsnap->vma_resource);
if (pinned)
*lockdep_cookie = dma_fence_begin_signalling();
return pinned;
}
/**
* i915_vma_snapshot_resource_unpin - Unblock vma snapshot memory from
* being released.
* @vsnap: The vma snapshot.
* @lockdep_cookie: Cookie returned from matching i915_vma_resource_pin().
*
* Might leave a fence signalling critical section and signal a fence.
*/
void i915_vma_snapshot_resource_unpin(struct i915_vma_snapshot *vsnap,
bool lockdep_cookie)
{
dma_fence_end_signalling(lockdep_cookie);
return i915_active_release(vsnap->vma_resource);
}
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