drm/i915: Introduce an internal allocator for disposable private objects

	  i915_gem_execbuffer.o \

	  i915_gem_fence.o \

	  i915_gem_gtt.o \

	  i915_gem_internal.o \

	  i915_gem.o \

	  i915_gem_render_state.o \

	  i915_gem_request.o \

					       u32 gtt_offset,

					       u32 size);

/* i915_gem_internal.c */

struct drm_i915_gem_object *

i915_gem_object_create_internal(struct drm_i915_private *dev_priv,

				unsigned int size);

/* i915_gem_shrinker.c */

unsigned long i915_gem_shrink(struct drm_i915_private *dev_priv,

			      unsigned long target,

			size_t size)

{

	struct drm_i915_gem_object *obj = NULL;

	struct drm_i915_gem_object *tmp, *next;

	struct drm_i915_gem_object *tmp;

	struct list_head *list;

	int n;

	int n, ret;

	lockdep_assert_held(&pool->engine->i915->drm.struct_mutex);

		n = ARRAY_SIZE(pool->cache_list) - 1;

	list = &pool->cache_list[n];

	list_for_each_entry_safe(tmp, next, list, batch_pool_link) {

	list_for_each_entry(tmp, list, batch_pool_link) {

		/* The batches are strictly LRU ordered */

		if (!i915_gem_active_is_idle(&tmp->last_read[pool->engine->id],

					     &tmp->base.dev->struct_mutex))

			break;

		/* While we're looping, do some clean up */

		if (tmp->madv == __I915_MADV_PURGED) {

			list_del(&tmp->batch_pool_link);

			i915_gem_object_put(tmp);

			continue;

		}

		if (tmp->base.size >= size) {

			obj = tmp;

			break;

	}

	if (obj == NULL) {

		int ret;

		obj = i915_gem_object_create(&pool->engine->i915->drm, size);

		obj = i915_gem_object_create_internal(pool->engine->i915, size);

		if (IS_ERR(obj))

			return obj;

	}

	ret = i915_gem_object_get_pages(obj);

	if (ret)

		return ERR_PTR(ret);

		obj->madv = I915_MADV_DONTNEED;

	}

	list_move_tail(&obj->batch_pool_link, list);

	i915_gem_object_pin_pages(obj);

	return obj;

/*

 * Copyright © 2014-2016 Intel Corporation

 *

 * Permission is hereby granted, free of charge, to any person obtaining a

 * copy of this software and associated documentation files (the "Software"),

 * to deal in the Software without restriction, including without limitation

 * the rights to use, copy, modify, merge, publish, distribute, sublicense,

 * and/or sell copies of the Software, and to permit persons to whom the

 * Software is furnished to do so, subject to the following conditions:

 *

 * The above copyright notice and this permission notice (including the next

 * paragraph) shall be included in all copies or substantial portions of the

 * Software.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL

 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING

 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS

 * IN THE SOFTWARE.

 *

 */

#include <drm/drmP.h>

#include <drm/i915_drm.h>

#include "i915_drv.h"

#define QUIET (__GFP_NORETRY | __GFP_NOWARN)

/* convert swiotlb segment size into sensible units (pages)! */

#define IO_TLB_SEGPAGES (IO_TLB_SEGSIZE << IO_TLB_SHIFT >> PAGE_SHIFT)

static void internal_free_pages(struct sg_table *st)

{

	struct scatterlist *sg;

	for (sg = st->sgl; sg; sg = __sg_next(sg))

		__free_pages(sg_page(sg), get_order(sg->length));

	sg_free_table(st);

	kfree(st);

}

static int i915_gem_object_get_pages_internal(struct drm_i915_gem_object *obj)

{

	struct drm_i915_private *i915 = to_i915(obj->base.dev);

	unsigned int npages = obj->base.size / PAGE_SIZE;

	struct sg_table *st;

	struct scatterlist *sg;

	int max_order;

	gfp_t gfp;

	st = kmalloc(sizeof(*st), GFP_KERNEL);

	if (!st)

		return -ENOMEM;

	if (sg_alloc_table(st, npages, GFP_KERNEL)) {

		kfree(st);

		return -ENOMEM;

	}

	sg = st->sgl;

	st->nents = 0;

	max_order = MAX_ORDER;

#ifdef CONFIG_SWIOTLB

	if (swiotlb_nr_tbl()) /* minimum max swiotlb size is IO_TLB_SEGSIZE */

		max_order = min(max_order, ilog2(IO_TLB_SEGPAGES));

#endif

	gfp = GFP_KERNEL | __GFP_HIGHMEM | __GFP_RECLAIMABLE;

	if (IS_CRESTLINE(i915) || IS_BROADWATER(i915)) {

		/* 965gm cannot relocate objects above 4GiB. */

		gfp &= ~__GFP_HIGHMEM;

		gfp |= __GFP_DMA32;

	}

	do {

		int order = min(fls(npages) - 1, max_order);

		struct page *page;

		do {

			page = alloc_pages(gfp | (order ? QUIET : 0), order);

			if (page)

				break;

			if (!order--)

				goto err;

			/* Limit subsequent allocations as well */

			max_order = order;

		} while (1);

		sg_set_page(sg, page, PAGE_SIZE << order, 0);

		st->nents++;

		npages -= 1 << order;

		if (!npages) {

			sg_mark_end(sg);

			break;

		}

		sg = __sg_next(sg);

	} while (1);

	obj->pages = st;

	if (i915_gem_gtt_prepare_object(obj)) {

		obj->pages = NULL;

		goto err;

	}

	/* Mark the pages as dontneed whilst they are still pinned. As soon

	 * as they are unpinned they are allowed to be reaped by the shrinker,

	 * and the caller is expected to repopulate - the contents of this

	 * object are only valid whilst active and pinned.

	 */

	obj->madv = I915_MADV_DONTNEED;

	return 0;

err:

	sg_mark_end(sg);

	internal_free_pages(st);

	return -ENOMEM;

}

static void i915_gem_object_put_pages_internal(struct drm_i915_gem_object *obj)

{

	i915_gem_gtt_finish_object(obj);

	internal_free_pages(obj->pages);

	obj->dirty = 0;

	obj->madv = I915_MADV_WILLNEED;

}

static const struct drm_i915_gem_object_ops i915_gem_object_internal_ops = {

	.flags = I915_GEM_OBJECT_HAS_STRUCT_PAGE,

	.get_pages = i915_gem_object_get_pages_internal,

	.put_pages = i915_gem_object_put_pages_internal,

};

/**

 * Creates a new object that wraps some internal memory for private use.

 * This object is not backed by swappable storage, and as such its contents

 * are volatile and only valid whilst pinned. If the object is reaped by the

 * shrinker, its pages and data will be discarded. Equally, it is not a full

 * GEM object and so not valid for access from userspace. This makes it useful

 * for hardware interfaces like ringbuffers (which are pinned from the time

 * the request is written to the time the hardware stops accessing it), but

 * not for contexts (which need to be preserved when not active for later

 * reuse). Note that it is not cleared upon allocation.

 */

struct drm_i915_gem_object *

i915_gem_object_create_internal(struct drm_i915_private *i915,

				unsigned int size)

{

	struct drm_i915_gem_object *obj;

	obj = i915_gem_object_alloc(&i915->drm);

	if (!obj)

		return ERR_PTR(-ENOMEM);

	drm_gem_private_object_init(&i915->drm, &obj->base, size);

	i915_gem_object_init(obj, &i915_gem_object_internal_ops);

	obj->base.write_domain = I915_GEM_DOMAIN_CPU;

	obj->base.read_domains = I915_GEM_DOMAIN_CPU;

	obj->cache_level = HAS_LLC(i915) ? I915_CACHE_LLC : I915_CACHE_NONE;

	return obj;

}

	if (so.rodata->batch_items * 4 > 4096)

		return -EINVAL;

	obj = i915_gem_object_create(&req->i915->drm, 4096);

	obj = i915_gem_object_create_internal(req->i915, 4096);

	if (IS_ERR(obj))

		return PTR_ERR(obj);