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// SPDX-License-Identifier: MIT
/*
* Copyright © 2019 Intel Corporation
*/
#include "intel_memory_region.h"
#include "i915_gem_region.h"
#include "i915_drv.h"
#include "i915_trace.h"
void i915_gem_object_init_memory_region(struct drm_i915_gem_object *obj,
struct intel_memory_region *mem)
{
obj->mm.region = mem;
mutex_lock(&mem->objects.lock);
list_add(&obj->mm.region_link, &mem->objects.list);
mutex_unlock(&mem->objects.lock);
}
void i915_gem_object_release_memory_region(struct drm_i915_gem_object *obj)
{
struct intel_memory_region *mem = obj->mm.region;
mutex_lock(&mem->objects.lock);
list_del(&obj->mm.region_link);
mutex_unlock(&mem->objects.lock);
}
struct drm_i915_gem_object *
i915_gem_object_create_region(struct intel_memory_region *mem,
resource_size_t size,
resource_size_t page_size,
unsigned int flags)
{
struct drm_i915_gem_object *obj;
resource_size_t default_page_size;
int err;
/*
* NB: Our use of resource_size_t for the size stems from using struct
* resource for the mem->region. We might need to revisit this in the
* future.
*/
GEM_BUG_ON(flags & ~I915_BO_ALLOC_FLAGS);
if (WARN_ON_ONCE(flags & I915_BO_ALLOC_GPU_ONLY &&
(flags & I915_BO_ALLOC_CPU_CLEAR ||
flags & I915_BO_ALLOC_PM_EARLY)))
return ERR_PTR(-EINVAL);
if (!mem)
return ERR_PTR(-ENODEV);
default_page_size = mem->min_page_size;
if (page_size)
default_page_size = page_size;
GEM_BUG_ON(!is_power_of_2_u64(default_page_size));
GEM_BUG_ON(default_page_size < PAGE_SIZE);
size = round_up(size, default_page_size);
GEM_BUG_ON(!size);
GEM_BUG_ON(!IS_ALIGNED(size, I915_GTT_MIN_ALIGNMENT));
if (i915_gem_object_size_2big(size))
return ERR_PTR(-E2BIG);
obj = i915_gem_object_alloc();
if (!obj)
return ERR_PTR(-ENOMEM);
/*
* Anything smaller than the min_page_size can't be freely inserted into
* the GTT, due to alignemnt restrictions. For such special objects,
* make sure we force memcpy based suspend-resume. In the future we can
* revisit this, either by allowing special mis-aligned objects in the
* migration path, or by mapping all of LMEM upfront using cheap 1G
* GTT entries.
*/
if (default_page_size < mem->min_page_size)
flags |= I915_BO_ALLOC_PM_EARLY;
err = mem->ops->init_object(mem, obj, size, page_size, flags);
if (err)
goto err_object_free;
trace_i915_gem_object_create(obj);
return obj;
err_object_free:
i915_gem_object_free(obj);
return ERR_PTR(err);
}
/**
* i915_gem_process_region - Iterate over all objects of a region using ops
* to process and optionally skip objects
* @mr: The memory region
* @apply: ops and private data
*
* This function can be used to iterate over the regions object list,
* checking whether to skip objects, and, if not, lock the objects and
* process them using the supplied ops. Note that this function temporarily
* removes objects from the region list while iterating, so that if run
* concurrently with itself may not iterate over all objects.
*
* Return: 0 if successful, negative error code on failure.
*/
int i915_gem_process_region(struct intel_memory_region *mr,
struct i915_gem_apply_to_region *apply)
{
const struct i915_gem_apply_to_region_ops *ops = apply->ops;
struct drm_i915_gem_object *obj;
struct list_head still_in_list;
int ret = 0;
/*
* In the future, a non-NULL apply->ww could mean the caller is
* already in a locking transaction and provides its own context.
*/
GEM_WARN_ON(apply->ww);
INIT_LIST_HEAD(&still_in_list);
mutex_lock(&mr->objects.lock);
for (;;) {
struct i915_gem_ww_ctx ww;
obj = list_first_entry_or_null(&mr->objects.list, typeof(*obj),
mm.region_link);
if (!obj)
break;
list_move_tail(&obj->mm.region_link, &still_in_list);
if (!kref_get_unless_zero(&obj->base.refcount))
continue;
/*
* Note: Someone else might be migrating the object at this
* point. The object's region is not stable until we lock
* the object.
*/
mutex_unlock(&mr->objects.lock);
apply->ww = &ww;
for_i915_gem_ww(&ww, ret, apply->interruptible) {
ret = i915_gem_object_lock(obj, apply->ww);
if (ret)
continue;
if (obj->mm.region == mr)
ret = ops->process_obj(apply, obj);
/* Implicit object unlock */
}
i915_gem_object_put(obj);
mutex_lock(&mr->objects.lock);
if (ret)
break;
}
list_splice_tail(&still_in_list, &mr->objects.list);
mutex_unlock(&mr->objects.lock);
return ret;
}
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