kolibrios/drivers/video/Intel-2D/kgem-sna.c

/*
 * Copyright (c) 2011 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.
 *
 * Authors:
 *    Chris Wilson <chris@chris-wilson.co.uk>
 *
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include "sna.h"
#include "sna_reg.h"


unsigned int cpu_cache_size();

static struct kgem_bo *
search_linear_cache(struct kgem *kgem, unsigned int num_pages, unsigned flags);

static struct kgem_bo *
search_snoop_cache(struct kgem *kgem, unsigned int num_pages, unsigned flags);

#define DBG_NO_HW 0
#define DBG_NO_TILING 1
#define DBG_NO_CACHE 0
#define DBG_NO_CACHE_LEVEL 0
#define DBG_NO_CPU 0
#define DBG_NO_USERPTR 0
#define DBG_NO_LLC 0
#define DBG_NO_SEMAPHORES 0
#define DBG_NO_MADV 1
#define DBG_NO_UPLOAD_CACHE 0
#define DBG_NO_UPLOAD_ACTIVE 0
#define DBG_NO_MAP_UPLOAD 0
#define DBG_NO_RELAXED_FENCING 0
#define DBG_NO_SECURE_BATCHES 0
#define DBG_NO_PINNED_BATCHES 0
#define DBG_NO_FAST_RELOC 0
#define DBG_NO_HANDLE_LUT 0
#define DBG_DUMP 0

#ifndef DEBUG_SYNC
#define DEBUG_SYNC 0
#endif

#define SHOW_BATCH 0

#if 0
#define ASSERT_IDLE(kgem__, handle__) assert(!__kgem_busy(kgem__, handle__))
#define ASSERT_MAYBE_IDLE(kgem__, handle__, expect__) assert(!(expect__) || !__kgem_busy(kgem__, handle__))
#else
#define ASSERT_IDLE(kgem__, handle__)
#define ASSERT_MAYBE_IDLE(kgem__, handle__, expect__)
#endif

/* Worst case seems to be 965gm where we cannot write within a cacheline that
 * is being simultaneously being read by the GPU, or within the sampler
 * prefetch. In general, the chipsets seem to have a requirement that sampler
 * offsets be aligned to a cacheline (64 bytes).
 */
#define UPLOAD_ALIGNMENT 128

#define PAGE_ALIGN(x) ALIGN(x, PAGE_SIZE)
#define NUM_PAGES(x) (((x) + PAGE_SIZE-1) / PAGE_SIZE)

#define MAX_GTT_VMA_CACHE 512
#define MAX_CPU_VMA_CACHE INT16_MAX
#define MAP_PRESERVE_TIME 10

#define MAP(ptr) ((void*)((uintptr_t)(ptr) & ~3))
#define MAKE_CPU_MAP(ptr) ((void*)((uintptr_t)(ptr) | 1))
#define MAKE_USER_MAP(ptr) ((void*)((uintptr_t)(ptr) | 3))
#define IS_USER_MAP(ptr) ((uintptr_t)(ptr) & 2)
#define __MAP_TYPE(ptr) ((uintptr_t)(ptr) & 3)

#define MAKE_REQUEST(rq, ring) ((struct kgem_request *)((uintptr_t)(rq) | (ring)))

#define LOCAL_I915_PARAM_HAS_BLT		        11
#define LOCAL_I915_PARAM_HAS_RELAXED_FENCING	12
#define LOCAL_I915_PARAM_HAS_RELAXED_DELTA	    15
#define LOCAL_I915_PARAM_HAS_SEMAPHORES		    20
#define LOCAL_I915_PARAM_HAS_SECURE_BATCHES	    23
#define LOCAL_I915_PARAM_HAS_PINNED_BATCHES	    24
#define LOCAL_I915_PARAM_HAS_NO_RELOC		    25
#define LOCAL_I915_PARAM_HAS_HANDLE_LUT		    26

#define LOCAL_I915_EXEC_IS_PINNED		(1<<10)
#define LOCAL_I915_EXEC_NO_RELOC		(1<<11)
#define LOCAL_I915_EXEC_HANDLE_LUT		(1<<12)
#define UNCACHED	0
#define SNOOPED		1

struct local_i915_gem_cacheing {
	uint32_t handle;
	uint32_t cacheing;
};

#define LOCAL_IOCTL_I915_GEM_SET_CACHEING SRV_I915_GEM_SET_CACHEING

struct kgem_buffer {
	struct kgem_bo base;
	void *mem;
	uint32_t used;
	uint32_t need_io : 1;
	uint32_t write : 2;
	uint32_t mmapped : 1;
};

static struct kgem_bo *__kgem_freed_bo;
static struct kgem_request *__kgem_freed_request;
static struct drm_i915_gem_exec_object2 _kgem_dummy_exec;

static inline int bytes(struct kgem_bo *bo)
{
	return __kgem_bo_size(bo);
}

#define bucket(B) (B)->size.pages.bucket
#define num_pages(B) (B)->size.pages.count

#ifdef DEBUG_MEMORY
static void debug_alloc(struct kgem *kgem, size_t size)
{
	kgem->debug_memory.bo_allocs++;
	kgem->debug_memory.bo_bytes += size;
}
static void debug_alloc__bo(struct kgem *kgem, struct kgem_bo *bo)
{
	debug_alloc(kgem, bytes(bo));
}
#else
#define debug_alloc(k, b)
#define debug_alloc__bo(k, b)
#endif

static void kgem_sna_reset(struct kgem *kgem)
{
	struct sna *sna = container_of(kgem, struct sna, kgem);

	sna->render.reset(sna);
	sna->blt_state.fill_bo = 0;
}

static void kgem_sna_flush(struct kgem *kgem)
{
	struct sna *sna = container_of(kgem, struct sna, kgem);

	sna->render.flush(sna);

//	if (sna->render.solid_cache.dirty)
//		sna_render_flush_solid(sna);
}

static bool gem_set_tiling(int fd, uint32_t handle, int tiling, int stride)
{
	struct drm_i915_gem_set_tiling set_tiling;
	int ret;

	if (DBG_NO_TILING)
		return false;
/*
	VG_CLEAR(set_tiling);
	do {
		set_tiling.handle = handle;
		set_tiling.tiling_mode = tiling;
		set_tiling.stride = stride;

		ret = ioctl(fd, DRM_IOCTL_I915_GEM_SET_TILING, &set_tiling);
	} while (ret == -1 && (errno == EINTR || errno == EAGAIN));
*/	
	return ret == 0;
}

static bool gem_set_cacheing(int fd, uint32_t handle, int cacheing)
{
	struct local_i915_gem_cacheing arg;

	VG_CLEAR(arg);
	arg.handle = handle;
	arg.cacheing = cacheing;
	return drmIoctl(fd, LOCAL_IOCTL_I915_GEM_SET_CACHEING, &arg) == 0;
}
	
	

	

static bool __kgem_throttle_retire(struct kgem *kgem, unsigned flags)
{
	if (flags & CREATE_NO_RETIRE) {
		DBG(("%s: not retiring per-request\n", __FUNCTION__));
		return false;
	}

	if (!kgem->need_retire) {
		DBG(("%s: nothing to retire\n", __FUNCTION__));
		return false;
	}

	if (kgem_retire(kgem))
		return true;

	if (flags & CREATE_NO_THROTTLE || !kgem->need_throttle) {
		DBG(("%s: not throttling\n", __FUNCTION__));
		return false;
	}

	kgem_throttle(kgem);
	return kgem_retire(kgem);
}

static void *__kgem_bo_map__gtt(struct kgem *kgem, struct kgem_bo *bo)
{
	struct drm_i915_gem_mmap_gtt mmap_arg;
	void *ptr;

	DBG(("%s(handle=%d, size=%d)\n", __FUNCTION__,
	     bo->handle, bytes(bo)));
	assert(bo->proxy == NULL);

retry_gtt:
	VG_CLEAR(mmap_arg);
	mmap_arg.handle = bo->handle;
	if (drmIoctl(kgem->fd, DRM_IOCTL_I915_GEM_MMAP_GTT, &mmap_arg)) {
		printf("%s: failed to retrieve GTT offset for handle=%d: %d\n",
		       __FUNCTION__, bo->handle, 0);
		(void)__kgem_throttle_retire(kgem, 0);
		if (kgem_expire_cache(kgem))
			goto retry_gtt;

		if (kgem->need_expire) {
			kgem_cleanup_cache(kgem);
			goto retry_gtt;
		}

		return NULL;
	}

retry_mmap:
//	ptr = mmap(0, bytes(bo), PROT_READ | PROT_WRITE, MAP_SHARED,
//		   kgem->fd, mmap_arg.offset);
	if (ptr == 0) {
		printf("%s: failed to mmap %d, %d bytes, into GTT domain: %d\n",
		       __FUNCTION__, bo->handle, bytes(bo), 0);
		if (__kgem_throttle_retire(kgem, 0))
			goto retry_mmap;

		if (kgem->need_expire) {
			kgem_cleanup_cache(kgem);
			goto retry_mmap;
		}

		ptr = NULL;
	}

	return ptr;
}

static int __gem_write(int fd, uint32_t handle,
		       int offset, int length,
		       const void *src)
{
	struct drm_i915_gem_pwrite pwrite;

	DBG(("%s(handle=%d, offset=%d, len=%d)\n", __FUNCTION__,
	     handle, offset, length));

	VG_CLEAR(pwrite);
	pwrite.handle = handle;
	pwrite.offset = offset;
	pwrite.size = length;
	pwrite.data_ptr = (uintptr_t)src;
	return drmIoctl(fd, DRM_IOCTL_I915_GEM_PWRITE, &pwrite);
}

static int gem_write(int fd, uint32_t handle,
		     int offset, int length,
		     const void *src)
{
	struct drm_i915_gem_pwrite pwrite;

	DBG(("%s(handle=%d, offset=%d, len=%d)\n", __FUNCTION__,
	     handle, offset, length));

	VG_CLEAR(pwrite);
	pwrite.handle = handle;
	/* align the transfer to cachelines; fortuitously this is safe! */
	if ((offset | length) & 63) {
		pwrite.offset = offset & ~63;
		pwrite.size = ALIGN(offset+length, 64) - pwrite.offset;
		pwrite.data_ptr = (uintptr_t)src + pwrite.offset - offset;
	} else {
		pwrite.offset = offset;
		pwrite.size = length;
		pwrite.data_ptr = (uintptr_t)src;
	}
	return drmIoctl(fd, DRM_IOCTL_I915_GEM_PWRITE, &pwrite);
}
	

bool __kgem_busy(struct kgem *kgem, int handle)
{
	struct drm_i915_gem_busy busy;
    
	VG_CLEAR(busy);
	busy.handle = handle;
	busy.busy = !kgem->wedged;
	(void)drmIoctl(kgem->fd, DRM_IOCTL_I915_GEM_BUSY, &busy);
	DBG(("%s: handle=%d, busy=%d, wedged=%d\n",
	     __FUNCTION__, handle, busy.busy, kgem->wedged));

	return busy.busy;
}

static void kgem_bo_retire(struct kgem *kgem, struct kgem_bo *bo)
{
	DBG(("%s: retiring bo handle=%d (needed flush? %d), rq? %d [busy?=%d]\n",
	     __FUNCTION__, bo->handle, bo->needs_flush, bo->rq != NULL,
	     __kgem_busy(kgem, bo->handle)));
	assert(bo->exec == NULL);
	assert(list_is_empty(&bo->vma));

	if (bo->rq) {
		if (!__kgem_busy(kgem, bo->handle)) {
			__kgem_bo_clear_busy(bo);
			kgem_retire(kgem);
		}
	} else {
		assert(!bo->needs_flush);
		ASSERT_IDLE(kgem, bo->handle);
	}
}

bool kgem_bo_write(struct kgem *kgem, struct kgem_bo *bo,
		   const void *data, int length)
{
	assert(bo->refcnt);
	assert(!bo->purged);
	assert(bo->proxy == NULL);
	ASSERT_IDLE(kgem, bo->handle);

	assert(length <= bytes(bo));
	if (gem_write(kgem->fd, bo->handle, 0, length, data))
		return false;

	DBG(("%s: flush=%d, domain=%d\n", __FUNCTION__, bo->flush, bo->domain));
	if (bo->exec == NULL) {
		kgem_bo_retire(kgem, bo);
		bo->domain = DOMAIN_NONE;
	}
	return true;
}

static uint32_t gem_create(int fd, int num_pages)
{
	struct drm_i915_gem_create create;

	VG_CLEAR(create);
	create.handle = 0;
	create.size = PAGE_SIZE * num_pages;
	(void)drmIoctl(fd, DRM_IOCTL_I915_GEM_CREATE, &create);

	return create.handle;
}

static bool
kgem_bo_set_purgeable(struct kgem *kgem, struct kgem_bo *bo)
{
#if DBG_NO_MADV
	return true;
#else
	struct drm_i915_gem_madvise madv;

	assert(bo->exec == NULL);
	assert(!bo->purged);

	VG_CLEAR(madv);
	madv.handle = bo->handle;
	madv.madv = I915_MADV_DONTNEED;
	if (drmIoctl(kgem->fd, DRM_IOCTL_I915_GEM_MADVISE, &madv) == 0) {
		bo->purged = 1;
		kgem->need_purge |= !madv.retained && bo->domain == DOMAIN_GPU;
		return madv.retained;
	}

	return true;
#endif
}

static bool
kgem_bo_is_retained(struct kgem *kgem, struct kgem_bo *bo)
{
#if DBG_NO_MADV
	return true;
#else
	struct drm_i915_gem_madvise madv;

	if (!bo->purged)
		return true;

	VG_CLEAR(madv);
	madv.handle = bo->handle;
	madv.madv = I915_MADV_DONTNEED;
	if (drmIoctl(kgem->fd, DRM_IOCTL_I915_GEM_MADVISE, &madv) == 0)
		return madv.retained;

	return false;
#endif
}

static bool
kgem_bo_clear_purgeable(struct kgem *kgem, struct kgem_bo *bo)
{
#if DBG_NO_MADV
	return true;
#else
	struct drm_i915_gem_madvise madv;

	assert(bo->purged);

	VG_CLEAR(madv);
	madv.handle = bo->handle;
	madv.madv = I915_MADV_WILLNEED;
	if (drmIoctl(kgem->fd, DRM_IOCTL_I915_GEM_MADVISE, &madv) == 0) {
		bo->purged = !madv.retained;
		kgem->need_purge |= !madv.retained && bo->domain == DOMAIN_GPU;
		return madv.retained;
	}

	return false;
#endif
}

static void gem_close(int fd, uint32_t handle)
{
	struct drm_gem_close close;

	VG_CLEAR(close);
	close.handle = handle;
	(void)drmIoctl(fd, DRM_IOCTL_GEM_CLOSE, &close);
}

constant inline static unsigned long __fls(unsigned long word)
{
#if defined(__GNUC__) && (defined(__i386__) || defined(__x86__) || defined(__x86_64__))
	asm("bsr %1,%0"
	    : "=r" (word)
	    : "rm" (word));
	return word;
#else
	unsigned int v = 0;

	while (word >>= 1)
		v++;

	return v;
#endif
}

constant inline static int cache_bucket(int num_pages)
{
	return __fls(num_pages);
}

static struct kgem_bo *__kgem_bo_init(struct kgem_bo *bo,
				      int handle, int num_pages)
{
	assert(num_pages);
	memset(bo, 0, sizeof(*bo));

	bo->refcnt = 1;
	bo->handle = handle;
	bo->target_handle = -1;
	num_pages(bo) = num_pages;
	bucket(bo) = cache_bucket(num_pages);
	bo->reusable = true;
	bo->domain = DOMAIN_CPU;
	list_init(&bo->request);
	list_init(&bo->list);
	list_init(&bo->vma);

	return bo;
}

static struct kgem_bo *__kgem_bo_alloc(int handle, int num_pages)
{
	struct kgem_bo *bo;

	if (__kgem_freed_bo) {
		bo = __kgem_freed_bo;
		__kgem_freed_bo = *(struct kgem_bo **)bo;
	} else {
		bo = malloc(sizeof(*bo));
		if (bo == NULL)
			return NULL;
	}

	return __kgem_bo_init(bo, handle, num_pages);
}

static struct kgem_request *__kgem_request_alloc(struct kgem *kgem)
{
	struct kgem_request *rq;

	rq = __kgem_freed_request;
	if (rq) {
		__kgem_freed_request = *(struct kgem_request **)rq;
	} else {
		rq = malloc(sizeof(*rq));
		if (rq == NULL)
			rq = &kgem->static_request;
	}

	list_init(&rq->buffers);
	rq->bo = NULL;
	rq->ring = 0;

	return rq;
}

static void __kgem_request_free(struct kgem_request *rq)
{
	_list_del(&rq->list);
	*(struct kgem_request **)rq = __kgem_freed_request;
	__kgem_freed_request = rq;
}

static struct list *inactive(struct kgem *kgem, int num_pages)
{
	assert(num_pages < MAX_CACHE_SIZE / PAGE_SIZE);
	assert(cache_bucket(num_pages) < NUM_CACHE_BUCKETS);
	return &kgem->inactive[cache_bucket(num_pages)];
}

static struct list *active(struct kgem *kgem, int num_pages, int tiling)
{
	assert(num_pages < MAX_CACHE_SIZE / PAGE_SIZE);
	assert(cache_bucket(num_pages) < NUM_CACHE_BUCKETS);
	return &kgem->active[cache_bucket(num_pages)][tiling];
}

static size_t
agp_aperture_size(struct pci_device *dev, unsigned gen)
{
	/* XXX assume that only future chipsets are unknown and follow
	 * the post gen2 PCI layout.
	 */
//	return dev->regions[gen < 030 ? 0 : 2].size;

    return 0;
}

static size_t
total_ram_size(void)
{
    uint32_t  data[9];
    size_t    size = 0;
    
    asm volatile("int $0x40"
        : "=a" (size)
        : "a" (18),"b"(20), "c" (data)
        : "memory");
    
    return size != -1 ? size : 0;
}

static int gem_param(struct kgem *kgem, int name)
{
    drm_i915_getparam_t gp;
    int v = -1; /* No param uses the sign bit, reserve it for errors */

    VG_CLEAR(gp);
    gp.param = name;
    gp.value = &v;
	if (drmIoctl(kgem->fd, DRM_IOCTL_I915_GETPARAM, &gp))
        return -1;

    VG(VALGRIND_MAKE_MEM_DEFINED(&v, sizeof(v)));
    return v;
}

static bool test_has_execbuffer2(struct kgem *kgem)
{
	return 1;
}

static bool test_has_no_reloc(struct kgem *kgem)
{
	if (DBG_NO_FAST_RELOC)
		return false;

	return gem_param(kgem, LOCAL_I915_PARAM_HAS_NO_RELOC) > 0;
}

static bool test_has_handle_lut(struct kgem *kgem)
{
	if (DBG_NO_HANDLE_LUT)
		return false;

	return gem_param(kgem, LOCAL_I915_PARAM_HAS_HANDLE_LUT) > 0;
}

static bool test_has_semaphores_enabled(struct kgem *kgem)
{
	FILE *file;
	bool detected = false;
	int ret;

	if (DBG_NO_SEMAPHORES)
		return false;

	ret = gem_param(kgem, LOCAL_I915_PARAM_HAS_SEMAPHORES);
	if (ret != -1)
		return ret > 0;

	return detected;
}

static bool __kgem_throttle(struct kgem *kgem)
{
//	if (drmIoctl(kgem->fd, DRM_IOCTL_I915_GEM_THROTTLE, NULL) == 0)
		return false;

//	return errno == EIO;
}

static bool is_hw_supported(struct kgem *kgem,
			    struct pci_device *dev)
{
	if (DBG_NO_HW)
		return false;

	if (!test_has_execbuffer2(kgem))
		return false;

	if (kgem->gen == (unsigned)-1) /* unknown chipset, assume future gen */
		return kgem->has_blt;

	/* Although pre-855gm the GMCH is fubar, it works mostly. So
	 * let the user decide through "NoAccel" whether or not to risk
	 * hw acceleration.
	 */

	if (kgem->gen == 060 && dev->revision < 8) {
		/* pre-production SNB with dysfunctional BLT */
		return false;
	}

	if (kgem->gen >= 060) /* Only if the kernel supports the BLT ring */
		return kgem->has_blt;

	return true;
}

static bool test_has_relaxed_fencing(struct kgem *kgem)
{
	if (kgem->gen < 040) {
		if (DBG_NO_RELAXED_FENCING)
			return false;

		return gem_param(kgem, LOCAL_I915_PARAM_HAS_RELAXED_FENCING) > 0;
	} else
		return true;
}

static bool test_has_llc(struct kgem *kgem)
{
	int has_llc = -1;

	if (DBG_NO_LLC)
		return false;

#if defined(I915_PARAM_HAS_LLC) /* Expected in libdrm-2.4.31 */
	has_llc = gem_param(kgem, I915_PARAM_HAS_LLC);
#endif
	if (has_llc == -1) {
		DBG(("%s: no kernel/drm support for HAS_LLC, assuming support for LLC based on GPU generation\n", __FUNCTION__));
		has_llc = kgem->gen >= 060;
	}

	return has_llc;
}

static bool test_has_cacheing(struct kgem *kgem)
{
	uint32_t handle;
	bool ret;

	if (DBG_NO_CACHE_LEVEL)
		return false;

	/* Incoherent blt and sampler hangs the GPU */
	if (kgem->gen == 040)
		return false;

	handle = gem_create(kgem->fd, 1);
	if (handle == 0)
		return false;

	ret = gem_set_cacheing(kgem->fd, handle, UNCACHED);
	gem_close(kgem->fd, handle);
	return ret;
}

static bool test_has_userptr(struct kgem *kgem)
{
#if defined(USE_USERPTR)
	uint32_t handle;
	void *ptr;

	if (DBG_NO_USERPTR)
		return false;

	/* Incoherent blt and sampler hangs the GPU */
	if (kgem->gen == 040)
		return false;

	ptr = malloc(PAGE_SIZE);
	handle = gem_userptr(kgem->fd, ptr, PAGE_SIZE, false);
	gem_close(kgem->fd, handle);
	free(ptr);

	return handle != 0;
#else
	return false;
#endif
}

static bool test_has_secure_batches(struct kgem *kgem)
{
	if (DBG_NO_SECURE_BATCHES)
		return false;

	return gem_param(kgem, LOCAL_I915_PARAM_HAS_SECURE_BATCHES) > 0;
}

static bool test_has_pinned_batches(struct kgem *kgem)
{
	if (DBG_NO_PINNED_BATCHES)
		return false;

	return gem_param(kgem, LOCAL_I915_PARAM_HAS_PINNED_BATCHES) > 0;
}


static bool kgem_init_pinned_batches(struct kgem *kgem)
{
	int count[2] = { 4, 2 };
	int size[2] = { 1, 4 };
	int n, i;

	if (kgem->wedged)
		return true;

	for (n = 0; n < ARRAY_SIZE(count); n++) {
		for (i = 0; i < count[n]; i++) {
			struct drm_i915_gem_pin pin;
			struct kgem_bo *bo;

			VG_CLEAR(pin);

			pin.handle = gem_create(kgem->fd, size[n]);
			if (pin.handle == 0)
				goto err;

			DBG(("%s: new handle=%d, num_pages=%d\n",
			     __FUNCTION__, pin.handle, size[n]));

			bo = __kgem_bo_alloc(pin.handle, size[n]);
			if (bo == NULL) {
				gem_close(kgem->fd, pin.handle);
				goto err;
			}

			pin.alignment = 0;
			if (drmIoctl(kgem->fd, DRM_IOCTL_I915_GEM_PIN, &pin)) {
				gem_close(kgem->fd, pin.handle);
				goto err;
			}
			bo->presumed_offset = pin.offset;
			debug_alloc__bo(kgem, bo);
			list_add(&bo->list, &kgem->pinned_batches[n]);
		}
	}

	return true;

err:
	for (n = 0; n < ARRAY_SIZE(kgem->pinned_batches); n++) {
		while (!list_is_empty(&kgem->pinned_batches[n])) {
			kgem_bo_destroy(kgem,
					list_first_entry(&kgem->pinned_batches[n],
							 struct kgem_bo, list));
		}
	}

	/* For simplicity populate the lists with a single unpinned bo */
	for (n = 0; n < ARRAY_SIZE(count); n++) {
		struct kgem_bo *bo;
		uint32_t handle;

		handle = gem_create(kgem->fd, size[n]);
		if (handle == 0)
			break;

		bo = __kgem_bo_alloc(handle, size[n]);
		if (bo == NULL) {
			gem_close(kgem->fd, handle);
			break;
		}

		debug_alloc__bo(kgem, bo);
		list_add(&bo->list, &kgem->pinned_batches[n]);
	}
	return false;
}

void kgem_init(struct kgem *kgem, int fd, struct pci_device *dev, unsigned gen)
{
    struct drm_i915_gem_get_aperture aperture;
    size_t totalram;
    unsigned half_gpu_max;
    unsigned int i, j;

    DBG(("%s: fd=%d, gen=%d\n", __FUNCTION__, fd, gen));

    memset(kgem, 0, sizeof(*kgem));

    kgem->fd = fd;
    kgem->gen = gen;

    list_init(&kgem->requests[0]);
    list_init(&kgem->requests[1]);
    list_init(&kgem->batch_buffers);
    list_init(&kgem->active_buffers);
    list_init(&kgem->flushing);
    list_init(&kgem->large);
    list_init(&kgem->large_inactive);
    list_init(&kgem->snoop);
    list_init(&kgem->scanout);
    for (i = 0; i < ARRAY_SIZE(kgem->pinned_batches); i++)
        list_init(&kgem->pinned_batches[i]);
    for (i = 0; i < ARRAY_SIZE(kgem->inactive); i++)
        list_init(&kgem->inactive[i]);
    for (i = 0; i < ARRAY_SIZE(kgem->active); i++) {
        for (j = 0; j < ARRAY_SIZE(kgem->active[i]); j++)
            list_init(&kgem->active[i][j]);
    }
    for (i = 0; i < ARRAY_SIZE(kgem->vma); i++) {
        for (j = 0; j < ARRAY_SIZE(kgem->vma[i].inactive); j++)
            list_init(&kgem->vma[i].inactive[j]);
    }
    kgem->vma[MAP_GTT].count = -MAX_GTT_VMA_CACHE;
    kgem->vma[MAP_CPU].count = -MAX_CPU_VMA_CACHE;

    kgem->has_blt = gem_param(kgem, LOCAL_I915_PARAM_HAS_BLT) > 0;
    DBG(("%s: has BLT ring? %d\n", __FUNCTION__,
         kgem->has_blt));

    kgem->has_relaxed_delta =
        gem_param(kgem, LOCAL_I915_PARAM_HAS_RELAXED_DELTA) > 0;
    DBG(("%s: has relaxed delta? %d\n", __FUNCTION__,
         kgem->has_relaxed_delta));

    kgem->has_relaxed_fencing = test_has_relaxed_fencing(kgem);
    DBG(("%s: has relaxed fencing? %d\n", __FUNCTION__,
         kgem->has_relaxed_fencing));

    kgem->has_llc = test_has_llc(kgem);
    DBG(("%s: has shared last-level-cache? %d\n", __FUNCTION__,
         kgem->has_llc));

    kgem->has_cacheing = test_has_cacheing(kgem);
    DBG(("%s: has set-cache-level? %d\n", __FUNCTION__,
         kgem->has_cacheing));

    kgem->has_userptr = test_has_userptr(kgem);
    DBG(("%s: has userptr? %d\n", __FUNCTION__,
         kgem->has_userptr));

    kgem->has_no_reloc = test_has_no_reloc(kgem);
    DBG(("%s: has no-reloc? %d\n", __FUNCTION__,
         kgem->has_no_reloc));

    kgem->has_handle_lut = test_has_handle_lut(kgem);
    DBG(("%s: has handle-lut? %d\n", __FUNCTION__,
         kgem->has_handle_lut));

    kgem->has_semaphores = false;
    if (kgem->has_blt && test_has_semaphores_enabled(kgem))
        kgem->has_semaphores = true;
    DBG(("%s: semaphores enabled? %d\n", __FUNCTION__,
         kgem->has_semaphores));

    kgem->can_blt_cpu = gen >= 030;
    DBG(("%s: can blt to cpu? %d\n", __FUNCTION__,
         kgem->can_blt_cpu));

    kgem->has_secure_batches = test_has_secure_batches(kgem);
    DBG(("%s: can use privileged batchbuffers? %d\n", __FUNCTION__,
         kgem->has_secure_batches));

    kgem->has_pinned_batches = test_has_pinned_batches(kgem);
    DBG(("%s: can use pinned batchbuffers (to avoid CS w/a)? %d\n", __FUNCTION__,
         kgem->has_pinned_batches));

    if (!is_hw_supported(kgem, dev)) {
        printf("Detected unsupported/dysfunctional hardware, disabling acceleration.\n");
        kgem->wedged = 1;
    } else if (__kgem_throttle(kgem)) {
        printf("Detected a hung GPU, disabling acceleration.\n");
        kgem->wedged = 1;
    }

    kgem->batch_size = ARRAY_SIZE(kgem->batch);
    if (gen == 020 && !kgem->has_pinned_batches)
        /* Limited to what we can pin */
        kgem->batch_size = 4*1024;
    if (gen == 022)
        /* 865g cannot handle a batch spanning multiple pages */
        kgem->batch_size = PAGE_SIZE / sizeof(uint32_t);
    if ((gen >> 3) == 7)
        kgem->batch_size = 16*1024;
    if (!kgem->has_relaxed_delta && kgem->batch_size > 4*1024)
        kgem->batch_size = 4*1024;

    if (!kgem_init_pinned_batches(kgem) && gen == 020) {
        printf("Unable to reserve memory for GPU, disabling acceleration.\n");
        kgem->wedged = 1;
    }

    DBG(("%s: maximum batch size? %d\n", __FUNCTION__,
         kgem->batch_size));

    kgem->min_alignment = 4;
    if (gen < 040)
        kgem->min_alignment = 64;

    kgem->half_cpu_cache_pages = cpu_cache_size() >> 13;
    DBG(("%s: half cpu cache %d pages\n", __FUNCTION__,
         kgem->half_cpu_cache_pages));

    kgem->next_request = __kgem_request_alloc(kgem);

    DBG(("%s: cpu bo enabled %d: llc? %d, set-cache-level? %d, userptr? %d\n", __FUNCTION__,
         !DBG_NO_CPU && (kgem->has_llc | kgem->has_userptr | kgem->has_cacheing),
         kgem->has_llc, kgem->has_cacheing, kgem->has_userptr));

    VG_CLEAR(aperture);
    aperture.aper_size = 0;
	(void)drmIoctl(fd, DRM_IOCTL_I915_GEM_GET_APERTURE, &aperture);
    if (aperture.aper_size == 0)
        aperture.aper_size = 64*1024*1024;

    DBG(("%s: aperture size %lld, available now %lld\n",
         __FUNCTION__,
         (long long)aperture.aper_size,
         (long long)aperture.aper_available_size));

    kgem->aperture_total = aperture.aper_size;
    kgem->aperture_high = aperture.aper_size * 3/4;
    kgem->aperture_low = aperture.aper_size * 1/3;
    if (gen < 033) {
        /* Severe alignment penalties */
        kgem->aperture_high /= 2;
        kgem->aperture_low /= 2;
    }
    DBG(("%s: aperture low=%d [%d], high=%d [%d]\n", __FUNCTION__,
         kgem->aperture_low, kgem->aperture_low / (1024*1024),
         kgem->aperture_high, kgem->aperture_high / (1024*1024)));

    kgem->aperture_mappable = agp_aperture_size(dev, gen);
    if (kgem->aperture_mappable == 0 ||
        kgem->aperture_mappable > aperture.aper_size)
        kgem->aperture_mappable = aperture.aper_size;
    DBG(("%s: aperture mappable=%d [%d MiB]\n", __FUNCTION__,
         kgem->aperture_mappable, kgem->aperture_mappable / (1024*1024)));

    kgem->buffer_size = 64 * 1024;
    while (kgem->buffer_size < kgem->aperture_mappable >> 10)
        kgem->buffer_size *= 2;
    if (kgem->buffer_size >> 12 > kgem->half_cpu_cache_pages)
        kgem->buffer_size = kgem->half_cpu_cache_pages << 12;
    DBG(("%s: buffer size=%d [%d KiB]\n", __FUNCTION__,
         kgem->buffer_size, kgem->buffer_size / 1024));

    kgem->max_object_size = 3 * (kgem->aperture_high >> 12) << 10;
    kgem->max_gpu_size = kgem->max_object_size;
    if (!kgem->has_llc)
        kgem->max_gpu_size = MAX_CACHE_SIZE;

    totalram = total_ram_size();
    if (totalram == 0) {
        DBG(("%s: total ram size unknown, assuming maximum of total aperture\n",
             __FUNCTION__));
        totalram = kgem->aperture_total;
    }
    DBG(("%s: total ram=%u\n", __FUNCTION__, totalram));
    if (kgem->max_object_size > totalram / 2)
        kgem->max_object_size = totalram / 2;
    if (kgem->max_gpu_size > totalram / 4)
        kgem->max_gpu_size = totalram / 4;

    kgem->max_cpu_size = kgem->max_object_size;

    half_gpu_max = kgem->max_gpu_size / 2;
    kgem->max_copy_tile_size = (MAX_CACHE_SIZE + 1)/2;
    if (kgem->max_copy_tile_size > half_gpu_max)
        kgem->max_copy_tile_size = half_gpu_max;

    if (kgem->has_llc)
        kgem->max_upload_tile_size = kgem->max_copy_tile_size;
    else
        kgem->max_upload_tile_size = kgem->aperture_mappable / 4;
    if (kgem->max_upload_tile_size > half_gpu_max)
        kgem->max_upload_tile_size = half_gpu_max;

    kgem->large_object_size = MAX_CACHE_SIZE;
    if (kgem->large_object_size > kgem->max_gpu_size)
        kgem->large_object_size = kgem->max_gpu_size;

    if (kgem->has_llc | kgem->has_cacheing | kgem->has_userptr) {
        if (kgem->large_object_size > kgem->max_cpu_size)
            kgem->large_object_size = kgem->max_cpu_size;
    } else
        kgem->max_cpu_size = 0;
    if (DBG_NO_CPU)
        kgem->max_cpu_size = 0;

    DBG(("%s: maximum object size=%d\n",
         __FUNCTION__, kgem->max_object_size));
    DBG(("%s: large object thresold=%d\n",
         __FUNCTION__, kgem->large_object_size));
    DBG(("%s: max object sizes (gpu=%d, cpu=%d, tile upload=%d, copy=%d)\n",
         __FUNCTION__,
         kgem->max_gpu_size, kgem->max_cpu_size,
         kgem->max_upload_tile_size, kgem->max_copy_tile_size));

    /* Convert the aperture thresholds to pages */
    kgem->aperture_low /= PAGE_SIZE;
    kgem->aperture_high /= PAGE_SIZE;

    kgem->fence_max = gem_param(kgem, I915_PARAM_NUM_FENCES_AVAIL) - 2;
    if ((int)kgem->fence_max < 0)
        kgem->fence_max = 5; /* minimum safe value for all hw */
    DBG(("%s: max fences=%d\n", __FUNCTION__, kgem->fence_max));

    kgem->batch_flags_base = 0;
    if (kgem->has_no_reloc)
        kgem->batch_flags_base |= LOCAL_I915_EXEC_NO_RELOC;
    if (kgem->has_handle_lut)
        kgem->batch_flags_base |= LOCAL_I915_EXEC_HANDLE_LUT;
    if (kgem->has_pinned_batches)
        kgem->batch_flags_base |= LOCAL_I915_EXEC_IS_PINNED;

}

static struct drm_i915_gem_exec_object2 *
kgem_add_handle(struct kgem *kgem, struct kgem_bo *bo)
{
	struct drm_i915_gem_exec_object2 *exec;

	DBG(("%s: handle=%d, index=%d\n",
	     __FUNCTION__, bo->handle, kgem->nexec));

	assert(kgem->nexec < ARRAY_SIZE(kgem->exec));
	bo->target_handle = kgem->has_handle_lut ? kgem->nexec : bo->handle;
	exec = memset(&kgem->exec[kgem->nexec++], 0, sizeof(*exec));
	exec->handle = bo->handle;
	exec->offset = bo->presumed_offset;

	kgem->aperture += num_pages(bo);

	return exec;
}

static void kgem_add_bo(struct kgem *kgem, struct kgem_bo *bo)
{
	bo->exec = kgem_add_handle(kgem, bo);
	bo->rq = MAKE_REQUEST(kgem->next_request, kgem->ring);

	list_move_tail(&bo->request, &kgem->next_request->buffers);

	/* XXX is it worth working around gcc here? */
	kgem->flush |= bo->flush;
}

static uint32_t kgem_end_batch(struct kgem *kgem)
{
	kgem->batch[kgem->nbatch++] = MI_BATCH_BUFFER_END;
	if (kgem->nbatch & 1)
		kgem->batch[kgem->nbatch++] = MI_NOOP;

	return kgem->nbatch;
}

static void kgem_fixup_self_relocs(struct kgem *kgem, struct kgem_bo *bo)
{
	int n;

	if (kgem->nreloc__self == 0)
		return;

	for (n = 0; n < kgem->nreloc__self; n++) {
		int i = kgem->reloc__self[n];
		assert(kgem->reloc[i].target_handle == ~0U);
		kgem->reloc[i].target_handle = bo->target_handle;
		kgem->reloc[i].presumed_offset = bo->presumed_offset;
		kgem->batch[kgem->reloc[i].offset/sizeof(kgem->batch[0])] =
			kgem->reloc[i].delta + bo->presumed_offset;
	}

	if (n == 256) {
		for (n = kgem->reloc__self[255]; n < kgem->nreloc; n++) {
			if (kgem->reloc[n].target_handle == ~0U) {
				kgem->reloc[n].target_handle = bo->target_handle;
				kgem->reloc[n].presumed_offset = bo->presumed_offset;
				kgem->batch[kgem->reloc[n].offset/sizeof(kgem->batch[0])] =
					kgem->reloc[n].delta + bo->presumed_offset;
			}
		}

	}

}

static void kgem_bo_binding_free(struct kgem *kgem, struct kgem_bo *bo)
{
	struct kgem_bo_binding *b;

	b = bo->binding.next;
	while (b) {
		struct kgem_bo_binding *next = b->next;
		free (b);
		b = next;
	}
}

static void kgem_bo_release_map(struct kgem *kgem, struct kgem_bo *bo)
{
	int type = IS_CPU_MAP(bo->map);

	assert(!IS_USER_MAP(bo->map));

	DBG(("%s: releasing %s vma for handle=%d, count=%d\n",
	     __FUNCTION__, type ? "CPU" : "GTT",
	     bo->handle, kgem->vma[type].count));

	VG(if (type) VALGRIND_MAKE_MEM_NOACCESS(MAP(bo->map), bytes(bo)));
//	munmap(MAP(bo->map), bytes(bo));
	bo->map = NULL;

	if (!list_is_empty(&bo->vma)) {
		list_del(&bo->vma);
		kgem->vma[type].count--;
	}
}

static void kgem_bo_free(struct kgem *kgem, struct kgem_bo *bo)
{
	DBG(("%s: handle=%d\n", __FUNCTION__, bo->handle));
	assert(bo->refcnt == 0);
	assert(bo->exec == NULL);
	assert(!bo->snoop || bo->rq == NULL);

#ifdef DEBUG_MEMORY
	kgem->debug_memory.bo_allocs--;
	kgem->debug_memory.bo_bytes -= bytes(bo);
#endif

	kgem_bo_binding_free(kgem, bo);

	if (IS_USER_MAP(bo->map)) {
		assert(bo->rq == NULL);
		assert(MAP(bo->map) != bo || bo->io);
		if (bo != MAP(bo->map)) {
			DBG(("%s: freeing snooped base\n", __FUNCTION__));
			free(MAP(bo->map));
		}
		bo->map = NULL;
	}
	if (bo->map)
		kgem_bo_release_map(kgem, bo);
	assert(list_is_empty(&bo->vma));

	_list_del(&bo->list);
	_list_del(&bo->request);
	gem_close(kgem->fd, bo->handle);

	if (!bo->io) {
		*(struct kgem_bo **)bo = __kgem_freed_bo;
		__kgem_freed_bo = bo;
	} else
		free(bo);
}

inline static void kgem_bo_move_to_inactive(struct kgem *kgem,
					    struct kgem_bo *bo)
{
	DBG(("%s: moving handle=%d to inactive\n", __FUNCTION__, bo->handle));

	assert(bo->refcnt == 0);
	assert(bo->reusable);
	assert(bo->rq == NULL);
	assert(bo->exec == NULL);
	assert(bo->domain != DOMAIN_GPU);
	assert(!bo->proxy);
	assert(!bo->io);
	assert(!bo->scanout);
	assert(!bo->needs_flush);
	assert(list_is_empty(&bo->vma));
	ASSERT_IDLE(kgem, bo->handle);

	kgem->need_expire = true;

	if (bucket(bo) >= NUM_CACHE_BUCKETS) {
		list_move(&bo->list, &kgem->large_inactive);
		return;
	}

	assert(bo->flush == false);
	list_move(&bo->list, &kgem->inactive[bucket(bo)]);
	if (bo->map) {
		int type = IS_CPU_MAP(bo->map);
		if (bucket(bo) >= NUM_CACHE_BUCKETS ||
		    (!type && !__kgem_bo_is_mappable(kgem, bo))) {
//			munmap(MAP(bo->map), bytes(bo));
			bo->map = NULL;
		}
		if (bo->map) {
			list_add(&bo->vma, &kgem->vma[type].inactive[bucket(bo)]);
			kgem->vma[type].count++;
		}
	}
}

static struct kgem_bo *kgem_bo_replace_io(struct kgem_bo *bo)
{
	struct kgem_bo *base;

	if (!bo->io)
		return bo;

	assert(!bo->snoop);
	base = malloc(sizeof(*base));
	if (base) {
		DBG(("%s: transferring io handle=%d to bo\n",
		     __FUNCTION__, bo->handle));
		/* transfer the handle to a minimum bo */
		memcpy(base, bo, sizeof(*base));
		base->io = false;
		list_init(&base->list);
		list_replace(&bo->request, &base->request);
		list_replace(&bo->vma, &base->vma);
		free(bo);
		bo = base;
	} else
		bo->reusable = false;

	return bo;
}

inline static void kgem_bo_remove_from_inactive(struct kgem *kgem,
						struct kgem_bo *bo)
{
	DBG(("%s: removing handle=%d from inactive\n", __FUNCTION__, bo->handle));

	list_del(&bo->list);
	assert(bo->rq == NULL);
	assert(bo->exec == NULL);
	if (bo->map) {
		assert(!list_is_empty(&bo->vma));
		list_del(&bo->vma);
		kgem->vma[IS_CPU_MAP(bo->map)].count--;
	}
}

inline static void kgem_bo_remove_from_active(struct kgem *kgem,
					      struct kgem_bo *bo)
{
	DBG(("%s: removing handle=%d from active\n", __FUNCTION__, bo->handle));

	list_del(&bo->list);
	assert(bo->rq != NULL);
	if (bo->rq == (void *)kgem)
		list_del(&bo->request);
	assert(list_is_empty(&bo->vma));
}

static void kgem_bo_clear_scanout(struct kgem *kgem, struct kgem_bo *bo)
{
	assert(bo->scanout);
	assert(!bo->refcnt);
	assert(bo->exec == NULL);
	assert(bo->proxy == NULL);

	DBG(("%s: handle=%d, fb=%d (reusable=%d)\n",
	     __FUNCTION__, bo->handle, bo->delta, bo->reusable));
	if (bo->delta) {
		/* XXX will leak if we are not DRM_MASTER. *shrug* */
//		drmModeRmFB(kgem->fd, bo->delta);
		bo->delta = 0;
	}

	bo->scanout = false;
	bo->flush = false;
	bo->reusable = true;

	if (kgem->has_llc &&
	    !gem_set_cacheing(kgem->fd, bo->handle, SNOOPED))
		bo->reusable = false;
}

static void _kgem_bo_delete_buffer(struct kgem *kgem, struct kgem_bo *bo)
{
	struct kgem_buffer *io = (struct kgem_buffer *)bo->proxy;

	DBG(("%s: size=%d, offset=%d, parent used=%d\n",
	     __FUNCTION__, bo->size.bytes, bo->delta, io->used));

	if (ALIGN(bo->delta + bo->size.bytes, UPLOAD_ALIGNMENT) == io->used)
		io->used = bo->delta;
}

static void kgem_bo_move_to_scanout(struct kgem *kgem, struct kgem_bo *bo)
{
	assert(bo->refcnt == 0);
	assert(bo->scanout);
	assert(bo->delta);
	assert(!bo->snoop);
	assert(!bo->io);

	DBG(("%s: moving %d [fb %d] to scanout cache, active? %d\n",
	     __FUNCTION__, bo->handle, bo->delta, bo->rq != NULL));
	if (bo->rq)
		list_move_tail(&bo->list, &kgem->scanout);
	else
	list_move(&bo->list, &kgem->scanout);
}

static void kgem_bo_move_to_snoop(struct kgem *kgem, struct kgem_bo *bo)
{
	assert(bo->refcnt == 0);
	assert(bo->exec == NULL);

	if (num_pages(bo) > kgem->max_cpu_size >> 13) {
		DBG(("%s handle=%d discarding large CPU buffer (%d >%d pages)\n",
		     __FUNCTION__, bo->handle, num_pages(bo), kgem->max_cpu_size >> 13));
		kgem_bo_free(kgem, bo);
		return;
	}

	assert(bo->tiling == I915_TILING_NONE);
	assert(bo->rq == NULL);

	DBG(("%s: moving %d to snoop cachee\n", __FUNCTION__, bo->handle));
	list_add(&bo->list, &kgem->snoop);
}

static struct kgem_bo *
search_snoop_cache(struct kgem *kgem, unsigned int num_pages, unsigned flags)
{
	struct kgem_bo *bo, *first = NULL;

	DBG(("%s: num_pages=%d, flags=%x\n", __FUNCTION__, num_pages, flags));

	if ((kgem->has_cacheing | kgem->has_userptr) == 0)
		return NULL;

	if (list_is_empty(&kgem->snoop)) {
		DBG(("%s: inactive and cache empty\n", __FUNCTION__));
		if (!__kgem_throttle_retire(kgem, flags)) {
			DBG(("%s: nothing retired\n", __FUNCTION__));
			return NULL;
		}
	}

	list_for_each_entry(bo, &kgem->snoop, list) {
		assert(bo->refcnt == 0);
		assert(bo->snoop);
		assert(!bo->scanout);
		assert(bo->proxy == NULL);
		assert(bo->tiling == I915_TILING_NONE);
		assert(bo->rq == NULL);
		assert(bo->exec == NULL);

		if (num_pages > num_pages(bo))
			continue;

		if (num_pages(bo) > 2*num_pages) {
			if (first == NULL)
				first = bo;
			continue;
		}

		list_del(&bo->list);
		bo->pitch = 0;
		bo->delta = 0;

		DBG(("  %s: found handle=%d (num_pages=%d) in snoop cache\n",
		     __FUNCTION__, bo->handle, num_pages(bo)));
		return bo;
	}

	if (first) {
		list_del(&first->list);
		first->pitch = 0;
		first->delta = 0;

		DBG(("  %s: found handle=%d (num_pages=%d) in snoop cache\n",
		     __FUNCTION__, first->handle, num_pages(first)));
		return first;
	}

	return NULL;
}

static void __kgem_bo_destroy(struct kgem *kgem, struct kgem_bo *bo)
{
	DBG(("%s: handle=%d\n", __FUNCTION__, bo->handle));

	assert(list_is_empty(&bo->list));
	assert(bo->refcnt == 0);
	assert(!bo->purged);
	assert(bo->proxy == NULL);

	bo->binding.offset = 0;

	if (DBG_NO_CACHE)
		goto destroy;

	if (bo->snoop && !bo->flush) {
		DBG(("%s: handle=%d is snooped\n", __FUNCTION__, bo->handle));
		assert(!bo->flush);
		assert(list_is_empty(&bo->list));
		if (bo->exec == NULL && bo->rq && !__kgem_busy(kgem, bo->handle))
			__kgem_bo_clear_busy(bo);
		if (bo->rq == NULL) {
			assert(!bo->needs_flush);
			kgem_bo_move_to_snoop(kgem, bo);
		}
		return;
	}

	if (bo->scanout) {
		kgem_bo_move_to_scanout(kgem, bo);
		return;
	}

	if (bo->io)
		bo = kgem_bo_replace_io(bo);
	if (!bo->reusable) {
		DBG(("%s: handle=%d, not reusable\n",
		     __FUNCTION__, bo->handle));
		goto destroy;
	}

	if (!kgem->has_llc && IS_CPU_MAP(bo->map) && bo->domain != DOMAIN_CPU)
		kgem_bo_release_map(kgem, bo);

	assert(list_is_empty(&bo->vma));
	assert(list_is_empty(&bo->list));
	assert(bo->snoop == false);
	assert(bo->io == false);
	assert(bo->scanout == false);

	if (bo->exec && kgem->nexec == 1) {
		DBG(("%s: only handle in batch, discarding last operations\n",
		     __FUNCTION__));
		assert(bo->exec == &kgem->exec[0]);
		assert(kgem->exec[0].handle == bo->handle);
		assert(RQ(bo->rq) == kgem->next_request);
		bo->refcnt = 1;
		kgem_reset(kgem);
		bo->refcnt = 0;
	}

	if (bo->rq && bo->exec == NULL && !__kgem_busy(kgem, bo->handle))
		__kgem_bo_clear_busy(bo);

	if (bo->rq) {
		struct list *cache;

		DBG(("%s: handle=%d -> active\n", __FUNCTION__, bo->handle));
		if (bucket(bo) < NUM_CACHE_BUCKETS)
			cache = &kgem->active[bucket(bo)][bo->tiling];
		else
			cache = &kgem->large;
		list_add(&bo->list, cache);
		return;
	}

	assert(bo->exec == NULL);
	assert(list_is_empty(&bo->request));

	if (!IS_CPU_MAP(bo->map)) {
		if (!kgem_bo_set_purgeable(kgem, bo))
			goto destroy;

		if (!kgem->has_llc && bo->domain == DOMAIN_CPU)
			goto destroy;

		DBG(("%s: handle=%d, purged\n",
		     __FUNCTION__, bo->handle));
	}

	kgem_bo_move_to_inactive(kgem, bo);
	return;

destroy:
	if (!bo->exec)
		kgem_bo_free(kgem, bo);
}

static void kgem_bo_unref(struct kgem *kgem, struct kgem_bo *bo)
{
	assert(bo->refcnt);
	if (--bo->refcnt == 0)
		__kgem_bo_destroy(kgem, bo);
}

static void kgem_buffer_release(struct kgem *kgem, struct kgem_buffer *bo)
{
	while (!list_is_empty(&bo->base.vma)) {
		struct kgem_bo *cached;

		cached = list_first_entry(&bo->base.vma, struct kgem_bo, vma);
		assert(cached->proxy == &bo->base);
		list_del(&cached->vma);

		assert(*(struct kgem_bo **)cached->map == cached);
		*(struct kgem_bo **)cached->map = NULL;
		cached->map = NULL;

		kgem_bo_destroy(kgem, cached);
	}
}

static bool kgem_retire__buffers(struct kgem *kgem)
{
	bool retired = false;

	while (!list_is_empty(&kgem->active_buffers)) {
		struct kgem_buffer *bo =
			list_last_entry(&kgem->active_buffers,
					struct kgem_buffer,
					base.list);

		if (bo->base.rq)
			break;

		DBG(("%s: releasing upload cache for handle=%d? %d\n",
		     __FUNCTION__, bo->base.handle, !list_is_empty(&bo->base.vma)));
		list_del(&bo->base.list);
		kgem_buffer_release(kgem, bo);
		kgem_bo_unref(kgem, &bo->base);
		retired = true;
	}

	return retired;
}

static bool kgem_retire__flushing(struct kgem *kgem)
{
	struct kgem_bo *bo, *next;
	bool retired = false;

	list_for_each_entry_safe(bo, next, &kgem->flushing, request) {
		assert(bo->rq == (void *)kgem);
		assert(bo->exec == NULL);

		if (__kgem_busy(kgem, bo->handle))
			break;

		__kgem_bo_clear_busy(bo);

		if (bo->refcnt)
			continue;

		if (bo->snoop) {
			kgem_bo_move_to_snoop(kgem, bo);
		} else if (bo->scanout) {
			kgem_bo_move_to_scanout(kgem, bo);
		} else if ((bo = kgem_bo_replace_io(bo))->reusable &&
			   kgem_bo_set_purgeable(kgem, bo)) {
			kgem_bo_move_to_inactive(kgem, bo);
			retired = true;
		} else
			kgem_bo_free(kgem, bo);
	}
#if HAS_DEBUG_FULL
	{
		int count = 0;
		list_for_each_entry(bo, &kgem->flushing, request)
			count++;
		printf("%s: %d bo on flushing list\n", __FUNCTION__, count);
	}
#endif

	kgem->need_retire |= !list_is_empty(&kgem->flushing);

	return retired;
}


static bool __kgem_retire_rq(struct kgem *kgem, struct kgem_request *rq)
{
	bool retired = false;

	DBG(("%s: request %d complete\n",
	     __FUNCTION__, rq->bo->handle));

	while (!list_is_empty(&rq->buffers)) {
		struct kgem_bo *bo;

		bo = list_first_entry(&rq->buffers,
				      struct kgem_bo,
				      request);

		assert(RQ(bo->rq) == rq);
		assert(bo->exec == NULL);
		assert(bo->domain == DOMAIN_GPU || bo->domain == DOMAIN_NONE);

		list_del(&bo->request);

		if (bo->needs_flush)
			bo->needs_flush = __kgem_busy(kgem, bo->handle);
		if (bo->needs_flush) {
			DBG(("%s: moving %d to flushing\n",
			     __FUNCTION__, bo->handle));
			list_add(&bo->request, &kgem->flushing);
			bo->rq = (void *)kgem;
			continue;
		}

		bo->domain = DOMAIN_NONE;
		bo->rq = NULL;
		if (bo->refcnt)
			continue;

		if (bo->snoop) {
			kgem_bo_move_to_snoop(kgem, bo);
		} else if (bo->scanout) {
			kgem_bo_move_to_scanout(kgem, bo);
		} else if ((bo = kgem_bo_replace_io(bo))->reusable &&
			   kgem_bo_set_purgeable(kgem, bo)) {
			kgem_bo_move_to_inactive(kgem, bo);
			retired = true;
		} else {
			DBG(("%s: closing %d\n",
			     __FUNCTION__, bo->handle));
			kgem_bo_free(kgem, bo);
		}
	}

	assert(rq->bo->rq == NULL);
	assert(list_is_empty(&rq->bo->request));

	if (--rq->bo->refcnt == 0) {
		if (kgem_bo_set_purgeable(kgem, rq->bo)) {
			kgem_bo_move_to_inactive(kgem, rq->bo);
			retired = true;
		} else {
			DBG(("%s: closing %d\n",
			     __FUNCTION__, rq->bo->handle));
			kgem_bo_free(kgem, rq->bo);
		}
	}

	__kgem_request_free(rq);
	return retired;
}

static bool kgem_retire__requests_ring(struct kgem *kgem, int ring)
{
	bool retired = false;

	while (!list_is_empty(&kgem->requests[ring])) {
		struct kgem_request *rq;

		rq = list_first_entry(&kgem->requests[ring],
				      struct kgem_request,
				      list);
		if (__kgem_busy(kgem, rq->bo->handle))
			break;

		retired |= __kgem_retire_rq(kgem, rq);
	}

#if HAS_DEBUG_FULL
	{
		struct kgem_bo *bo;
		int count = 0;

		list_for_each_entry(bo, &kgem->requests[ring], request)
			count++;

		bo = NULL;
		if (!list_is_empty(&kgem->requests[ring]))
			bo = list_first_entry(&kgem->requests[ring],
					      struct kgem_request,
					      list)->bo;

		printf("%s: ring=%d, %d outstanding requests, oldest=%d\n",
		       __FUNCTION__, ring, count, bo ? bo->handle : 0);
	}
#endif

	return retired;
}

static bool kgem_retire__requests(struct kgem *kgem)
{
	bool retired = false;
	int n;

	for (n = 0; n < ARRAY_SIZE(kgem->requests); n++) {
		retired |= kgem_retire__requests_ring(kgem, n);
		kgem->need_retire |= !list_is_empty(&kgem->requests[n]);
	}

	return retired;
}

bool kgem_retire(struct kgem *kgem)
{
	bool retired = false;

	DBG(("%s\n", __FUNCTION__));

	kgem->need_retire = false;

	retired |= kgem_retire__flushing(kgem);
	retired |= kgem_retire__requests(kgem);
	retired |= kgem_retire__buffers(kgem);

	DBG(("%s -- retired=%d, need_retire=%d\n",
	     __FUNCTION__, retired, kgem->need_retire));

	kgem->retire(kgem);

	return retired;
}







static void kgem_commit(struct kgem *kgem)
{
	struct kgem_request *rq = kgem->next_request;
	struct kgem_bo *bo, *next;

	list_for_each_entry_safe(bo, next, &rq->buffers, request) {
		assert(next->request.prev == &bo->request);

		DBG(("%s: release handle=%d (proxy? %d), dirty? %d flush? %d, snoop? %d -> offset=%x\n",
		     __FUNCTION__, bo->handle, bo->proxy != NULL,
		     bo->dirty, bo->needs_flush, bo->snoop,
		     (unsigned)bo->exec->offset));

		assert(!bo->purged);
		assert(bo->exec);
		assert(bo->proxy == NULL || bo->exec == &_kgem_dummy_exec);
		assert(RQ(bo->rq) == rq || (RQ(bo->proxy->rq) == rq));

		bo->presumed_offset = bo->exec->offset;
		bo->exec = NULL;
		bo->target_handle = -1;

		if (!bo->refcnt && !bo->reusable) {
			assert(!bo->snoop);
			kgem_bo_free(kgem, bo);
			continue;
		}

		bo->binding.offset = 0;
		bo->domain = DOMAIN_GPU;
		bo->dirty = false;

		if (bo->proxy) {
			/* proxies are not used for domain tracking */
			bo->exec = NULL;
			__kgem_bo_clear_busy(bo);
		}

		kgem->scanout_busy |= bo->scanout;
	}

	if (rq == &kgem->static_request) {
		struct drm_i915_gem_set_domain set_domain;

		DBG(("%s: syncing due to allocation failure\n", __FUNCTION__));

		VG_CLEAR(set_domain);
		set_domain.handle = rq->bo->handle;
		set_domain.read_domains = I915_GEM_DOMAIN_GTT;
		set_domain.write_domain = I915_GEM_DOMAIN_GTT;
		if (drmIoctl(kgem->fd, DRM_IOCTL_I915_GEM_SET_DOMAIN, &set_domain)) {
			DBG(("%s: sync: GPU hang detected\n", __FUNCTION__));
			kgem_throttle(kgem);
		}

		kgem_retire(kgem);
		assert(list_is_empty(&rq->buffers));

		gem_close(kgem->fd, rq->bo->handle);
		kgem_cleanup_cache(kgem);
	} else {
		list_add_tail(&rq->list, &kgem->requests[rq->ring]);
		kgem->need_throttle = kgem->need_retire = 1;
	}

	kgem->next_request = NULL;
}

static void kgem_close_list(struct kgem *kgem, struct list *head)
{
	while (!list_is_empty(head))
		kgem_bo_free(kgem, list_first_entry(head, struct kgem_bo, list));
}

static void kgem_close_inactive(struct kgem *kgem)
{
	unsigned int i;

	for (i = 0; i < ARRAY_SIZE(kgem->inactive); i++)
		kgem_close_list(kgem, &kgem->inactive[i]);
}

static void kgem_finish_buffers(struct kgem *kgem)
{
	struct kgem_buffer *bo, *next;

	list_for_each_entry_safe(bo, next, &kgem->batch_buffers, base.list) {
		DBG(("%s: buffer handle=%d, used=%d, exec?=%d, write=%d, mmapped=%d\n",
		     __FUNCTION__, bo->base.handle, bo->used, bo->base.exec!=NULL,
		     bo->write, bo->mmapped));

		assert(next->base.list.prev == &bo->base.list);
		assert(bo->base.io);
		assert(bo->base.refcnt >= 1);

		if (!bo->base.exec) {
			DBG(("%s: skipping unattached handle=%d, used=%d\n",
			     __FUNCTION__, bo->base.handle, bo->used));
			continue;
		}

		if (!bo->write) {
			assert(bo->base.exec || bo->base.refcnt > 1);
			goto decouple;
		}

		if (bo->mmapped) {
			int used;

			assert(!bo->need_io);

			used = ALIGN(bo->used, PAGE_SIZE);
			if (!DBG_NO_UPLOAD_ACTIVE &&
			    used + PAGE_SIZE <= bytes(&bo->base) &&
			    (kgem->has_llc || !IS_CPU_MAP(bo->base.map) || bo->base.snoop)) {
				DBG(("%s: retaining upload buffer (%d/%d)\n",
				     __FUNCTION__, bo->used, bytes(&bo->base)));
				bo->used = used;
				list_move(&bo->base.list,
					  &kgem->active_buffers);
				continue;
			}
			DBG(("%s: discarding mmapped buffer, used=%d, map type=%d\n",
			     __FUNCTION__, bo->used, (int)__MAP_TYPE(bo->base.map)));
			goto decouple;
		}

		if (!bo->used) {
			/* Unless we replace the handle in the execbuffer,
			 * then this bo will become active. So decouple it
			 * from the buffer list and track it in the normal
			 * manner.
			 */
			goto decouple;
		}

		assert(bo->need_io);
		assert(bo->base.rq == MAKE_REQUEST(kgem->next_request, kgem->ring));
		assert(bo->base.domain != DOMAIN_GPU);

		if (bo->base.refcnt == 1 &&
		    bo->base.size.pages.count > 1 &&
		    bo->used < bytes(&bo->base) / 2) {
			struct kgem_bo *shrink;
			unsigned alloc = NUM_PAGES(bo->used);

			shrink = search_snoop_cache(kgem, alloc,
						    CREATE_INACTIVE | CREATE_NO_RETIRE);
			if (shrink) {
				void *map;
				int n;

				DBG(("%s: used=%d, shrinking %d to %d, handle %d to %d\n",
				     __FUNCTION__,
				     bo->used, bytes(&bo->base), bytes(shrink),
				     bo->base.handle, shrink->handle));

				assert(bo->used <= bytes(shrink));
				map = kgem_bo_map__cpu(kgem, shrink);
				if (map) {
					kgem_bo_sync__cpu(kgem, shrink);
					memcpy(map, bo->mem, bo->used);

					shrink->target_handle =
						kgem->has_handle_lut ? bo->base.target_handle : shrink->handle;
					for (n = 0; n < kgem->nreloc; n++) {
						if (kgem->reloc[n].target_handle == bo->base.target_handle) {
							kgem->reloc[n].target_handle = shrink->target_handle;
							kgem->reloc[n].presumed_offset = shrink->presumed_offset;
							kgem->batch[kgem->reloc[n].offset/sizeof(kgem->batch[0])] =
								kgem->reloc[n].delta + shrink->presumed_offset;
						}
					}

					bo->base.exec->handle = shrink->handle;
					bo->base.exec->offset = shrink->presumed_offset;
					shrink->exec = bo->base.exec;
					shrink->rq = bo->base.rq;
					list_replace(&bo->base.request,
						     &shrink->request);
					list_init(&bo->base.request);
					shrink->needs_flush = bo->base.dirty;

					bo->base.exec = NULL;
					bo->base.rq = NULL;
					bo->base.dirty = false;
					bo->base.needs_flush = false;
					bo->used = 0;

					goto decouple;
				}

				__kgem_bo_destroy(kgem, shrink);
			}

			shrink = search_linear_cache(kgem, alloc,
						     CREATE_INACTIVE | CREATE_NO_RETIRE);
			if (shrink) {
				int n;

				DBG(("%s: used=%d, shrinking %d to %d, handle %d to %d\n",
				     __FUNCTION__,
				     bo->used, bytes(&bo->base), bytes(shrink),
				     bo->base.handle, shrink->handle));

				assert(bo->used <= bytes(shrink));
				if (gem_write(kgem->fd, shrink->handle,
					      0, bo->used, bo->mem) == 0) {
					shrink->target_handle =
						kgem->has_handle_lut ? bo->base.target_handle : shrink->handle;
					for (n = 0; n < kgem->nreloc; n++) {
						if (kgem->reloc[n].target_handle == bo->base.target_handle) {
							kgem->reloc[n].target_handle = shrink->target_handle;
							kgem->reloc[n].presumed_offset = shrink->presumed_offset;
							kgem->batch[kgem->reloc[n].offset/sizeof(kgem->batch[0])] =
								kgem->reloc[n].delta + shrink->presumed_offset;
						}
					}

					bo->base.exec->handle = shrink->handle;
					bo->base.exec->offset = shrink->presumed_offset;
					shrink->exec = bo->base.exec;
					shrink->rq = bo->base.rq;
					list_replace(&bo->base.request,
						     &shrink->request);
					list_init(&bo->base.request);
					shrink->needs_flush = bo->base.dirty;

					bo->base.exec = NULL;
					bo->base.rq = NULL;
					bo->base.dirty = false;
					bo->base.needs_flush = false;
					bo->used = 0;

					goto decouple;
				}

				__kgem_bo_destroy(kgem, shrink);
			}
		}

		DBG(("%s: handle=%d, uploading %d/%d\n",
		     __FUNCTION__, bo->base.handle, bo->used, bytes(&bo->base)));
		ASSERT_IDLE(kgem, bo->base.handle);
		assert(bo->used <= bytes(&bo->base));
		gem_write(kgem->fd, bo->base.handle,
			  0, bo->used, bo->mem);
		bo->need_io = 0;

decouple:
		DBG(("%s: releasing handle=%d\n",
		     __FUNCTION__, bo->base.handle));
		list_del(&bo->base.list);
		kgem_bo_unref(kgem, &bo->base);
	}
}

static void kgem_cleanup(struct kgem *kgem)
{
	int n;

	for (n = 0; n < ARRAY_SIZE(kgem->requests); n++) {
		while (!list_is_empty(&kgem->requests[n])) {
			struct kgem_request *rq;

			rq = list_first_entry(&kgem->requests[n],
					      struct kgem_request,
					      list);
			while (!list_is_empty(&rq->buffers)) {
				struct kgem_bo *bo;

				bo = list_first_entry(&rq->buffers,
						      struct kgem_bo,
						      request);

				bo->exec = NULL;
				bo->dirty = false;
				__kgem_bo_clear_busy(bo);
				if (bo->refcnt == 0)
					kgem_bo_free(kgem, bo);
			}

			__kgem_request_free(rq);
		}
	}

	kgem_close_inactive(kgem);
}

static int kgem_batch_write(struct kgem *kgem, uint32_t handle, uint32_t size)
{
	int ret;

	ASSERT_IDLE(kgem, handle);

	/* If there is no surface data, just upload the batch */
	if (kgem->surface == kgem->batch_size)
		return gem_write(kgem->fd, handle,
				 0, sizeof(uint32_t)*kgem->nbatch,
				 kgem->batch);

	/* Are the batch pages conjoint with the surface pages? */
	if (kgem->surface < kgem->nbatch + PAGE_SIZE/sizeof(uint32_t)) {
		assert(size == PAGE_ALIGN(kgem->batch_size*sizeof(uint32_t)));
		return gem_write(kgem->fd, handle,
				 0, kgem->batch_size*sizeof(uint32_t),
				 kgem->batch);
	}

	/* Disjoint surface/batch, upload separately */
	ret = gem_write(kgem->fd, handle,
			0, sizeof(uint32_t)*kgem->nbatch,
			kgem->batch);
	if (ret)
		return ret;

	ret = PAGE_ALIGN(sizeof(uint32_t) * kgem->batch_size);
	ret -= sizeof(uint32_t) * kgem->surface;
	assert(size-ret >= kgem->nbatch*sizeof(uint32_t));
	return __gem_write(kgem->fd, handle,
			size - ret, (kgem->batch_size - kgem->surface)*sizeof(uint32_t),
			kgem->batch + kgem->surface);
}

void kgem_reset(struct kgem *kgem)
{
	if (kgem->next_request) {
		struct kgem_request *rq = kgem->next_request;

		while (!list_is_empty(&rq->buffers)) {
			struct kgem_bo *bo =
				list_first_entry(&rq->buffers,
						 struct kgem_bo,
						 request);
			list_del(&bo->request);

			assert(RQ(bo->rq) == rq);

			bo->binding.offset = 0;
			bo->exec = NULL;
			bo->target_handle = -1;
			bo->dirty = false;

			if (bo->needs_flush && __kgem_busy(kgem, bo->handle)) {
				list_add(&bo->request, &kgem->flushing);
				bo->rq = (void *)kgem;
			} else
				__kgem_bo_clear_busy(bo);

			if (!bo->refcnt && !bo->reusable) {
				assert(!bo->snoop);
				DBG(("%s: discarding handle=%d\n",
				     __FUNCTION__, bo->handle));
				kgem_bo_free(kgem, bo);
			}
		}

		if (rq != &kgem->static_request) {
			list_init(&rq->list);
			__kgem_request_free(rq);
		}
	}

	kgem->nfence = 0;
	kgem->nexec = 0;
	kgem->nreloc = 0;
	kgem->nreloc__self = 0;
	kgem->aperture = 0;
	kgem->aperture_fenced = 0;
	kgem->nbatch = 0;
	kgem->surface = kgem->batch_size;
	kgem->mode = KGEM_NONE;
	kgem->flush = 0;
	kgem->batch_flags = kgem->batch_flags_base;

	kgem->next_request = __kgem_request_alloc(kgem);

	kgem_sna_reset(kgem);
}

static int compact_batch_surface(struct kgem *kgem)
{
	int size, shrink, n;

	if (!kgem->has_relaxed_delta)
		return kgem->batch_size;

	/* See if we can pack the contents into one or two pages */
	n = ALIGN(kgem->batch_size, 1024);
	size = n - kgem->surface + kgem->nbatch;
	size = ALIGN(size, 1024);

	shrink = n - size;
	if (shrink) {
		DBG(("shrinking from %d to %d\n", kgem->batch_size, size));

		shrink *= sizeof(uint32_t);
		for (n = 0; n < kgem->nreloc; n++) {
			if (kgem->reloc[n].read_domains == I915_GEM_DOMAIN_INSTRUCTION &&
			    kgem->reloc[n].target_handle == ~0U)
				kgem->reloc[n].delta -= shrink;

			if (kgem->reloc[n].offset >= sizeof(uint32_t)*kgem->nbatch)
				kgem->reloc[n].offset -= shrink;
		}
	}

	return size * sizeof(uint32_t);
}

static struct kgem_bo *
kgem_create_batch(struct kgem *kgem, int size)
{
	struct drm_i915_gem_set_domain set_domain;
	struct kgem_bo *bo;

	if (size <= 4096) {
		bo = list_first_entry(&kgem->pinned_batches[0],
				      struct kgem_bo,
				      list);
		if (!bo->rq) {
out_4096:
			list_move_tail(&bo->list, &kgem->pinned_batches[0]);
			return kgem_bo_reference(bo);
		}

		if (!__kgem_busy(kgem, bo->handle)) {
			assert(RQ(bo->rq)->bo == bo);
			__kgem_retire_rq(kgem, RQ(bo->rq));
			goto out_4096;
		}
	}

	if (size <= 16384) {
		bo = list_first_entry(&kgem->pinned_batches[1],
				      struct kgem_bo,
				      list);
		if (!bo->rq) {
out_16384:
			list_move_tail(&bo->list, &kgem->pinned_batches[1]);
			return kgem_bo_reference(bo);
		}

		if (!__kgem_busy(kgem, bo->handle)) {
			assert(RQ(bo->rq)->bo == bo);
			__kgem_retire_rq(kgem, RQ(bo->rq));
			goto out_16384;
		}
	}

	if (kgem->gen == 020 && !kgem->has_pinned_batches) {
		assert(size <= 16384);

		bo = list_first_entry(&kgem->pinned_batches[size > 4096],
				      struct kgem_bo,
				      list);
		list_move_tail(&bo->list, &kgem->pinned_batches[size > 4096]);

		DBG(("%s: syncing due to busy batches\n", __FUNCTION__));

		VG_CLEAR(set_domain);
		set_domain.handle = bo->handle;
		set_domain.read_domains = I915_GEM_DOMAIN_GTT;
		set_domain.write_domain = I915_GEM_DOMAIN_GTT;
		if (drmIoctl(kgem->fd, DRM_IOCTL_I915_GEM_SET_DOMAIN, &set_domain)) {
			DBG(("%s: sync: GPU hang detected\n", __FUNCTION__));
			kgem_throttle(kgem);
			return NULL;
		}

		kgem_retire(kgem);
		assert(bo->rq == NULL);
		return kgem_bo_reference(bo);
	}

	return kgem_create_linear(kgem, size, CREATE_NO_THROTTLE);
}

void _kgem_submit(struct kgem *kgem)
{
	struct kgem_request *rq;
	uint32_t batch_end;
	int size;

	assert(!DBG_NO_HW);
	assert(!kgem->wedged);

	assert(kgem->nbatch);
	assert(kgem->nbatch <= KGEM_BATCH_SIZE(kgem));
	assert(kgem->nbatch <= kgem->surface);

	batch_end = kgem_end_batch(kgem);
	kgem_sna_flush(kgem);

	DBG(("batch[%d/%d]: %d %d %d %d, nreloc=%d, nexec=%d, nfence=%d, aperture=%d\n",
	     kgem->mode, kgem->ring, batch_end, kgem->nbatch, kgem->surface, kgem->batch_size,
	     kgem->nreloc, kgem->nexec, kgem->nfence, kgem->aperture));

	assert(kgem->nbatch <= kgem->batch_size);
	assert(kgem->nbatch <= kgem->surface);
	assert(kgem->nreloc <= ARRAY_SIZE(kgem->reloc));
	assert(kgem->nexec < ARRAY_SIZE(kgem->exec));
	assert(kgem->nfence <= kgem->fence_max);

	kgem_finish_buffers(kgem);

#if SHOW_BATCH
	__kgem_batch_debug(kgem, batch_end);
#endif

	rq = kgem->next_request;
	if (kgem->surface != kgem->batch_size)
		size = compact_batch_surface(kgem);
	else
		size = kgem->nbatch * sizeof(kgem->batch[0]);
	rq->bo = kgem_create_batch(kgem, size);
	if (rq->bo) {
		uint32_t handle = rq->bo->handle;
		int i;

		assert(!rq->bo->needs_flush);

		i = kgem->nexec++;
		kgem->exec[i].handle = handle;
		kgem->exec[i].relocation_count = kgem->nreloc;
		kgem->exec[i].relocs_ptr = (uintptr_t)kgem->reloc;
		kgem->exec[i].alignment = 0;
		kgem->exec[i].offset = rq->bo->presumed_offset;
		kgem->exec[i].flags = 0;
		kgem->exec[i].rsvd1 = 0;
		kgem->exec[i].rsvd2 = 0;

		rq->bo->target_handle = kgem->has_handle_lut ? i : handle;
		rq->bo->exec = &kgem->exec[i];
		rq->bo->rq = MAKE_REQUEST(rq, kgem->ring); /* useful sanity check */
		list_add(&rq->bo->request, &rq->buffers);
		rq->ring = kgem->ring == KGEM_BLT;

		kgem_fixup_self_relocs(kgem, rq->bo);

		if (kgem_batch_write(kgem, handle, size) == 0) {
			struct drm_i915_gem_execbuffer2 execbuf;
			int ret, retry = 3;

			VG_CLEAR(execbuf);
			execbuf.buffers_ptr = (uintptr_t)kgem->exec;
			execbuf.buffer_count = kgem->nexec;
			execbuf.batch_start_offset = 0;
			execbuf.batch_len = batch_end*sizeof(uint32_t);
			execbuf.cliprects_ptr = 0;
			execbuf.num_cliprects = 0;
			execbuf.DR1 = 0;
			execbuf.DR4 = 0;
			execbuf.flags = kgem->ring | kgem->batch_flags;
			execbuf.rsvd1 = 0;
			execbuf.rsvd2 = 0;



//			ret = drmIoctl(kgem->fd,
//				       DRM_IOCTL_I915_GEM_EXECBUFFER2,
//				       &execbuf);
//			while (ret == -1 && errno == EBUSY && retry--) {
//				__kgem_throttle(kgem);
//				ret = drmIoctl(kgem->fd,
//					       DRM_IOCTL_I915_GEM_EXECBUFFER2,
//					       &execbuf);
//			}
			if (DEBUG_SYNC && ret == 0) {
				struct drm_i915_gem_set_domain set_domain;

				VG_CLEAR(set_domain);
				set_domain.handle = handle;
				set_domain.read_domains = I915_GEM_DOMAIN_GTT;
				set_domain.write_domain = I915_GEM_DOMAIN_GTT;

				ret = drmIoctl(kgem->fd, DRM_IOCTL_I915_GEM_SET_DOMAIN, &set_domain);
			}
			if (ret == -1) {
//				DBG(("%s: GPU hang detected [%d]\n",
//				     __FUNCTION__, errno));
				kgem_throttle(kgem);
				kgem->wedged = true;

#if 0
				ret = errno;
				ErrorF("batch[%d/%d]: %d %d %d, nreloc=%d, nexec=%d, nfence=%d, aperture=%d: errno=%d\n",
				       kgem->mode, kgem->ring, batch_end, kgem->nbatch, kgem->surface,
				       kgem->nreloc, kgem->nexec, kgem->nfence, kgem->aperture, errno);

				for (i = 0; i < kgem->nexec; i++) {
					struct kgem_bo *bo, *found = NULL;

					list_for_each_entry(bo, &kgem->next_request->buffers, request) {
						if (bo->handle == kgem->exec[i].handle) {
							found = bo;
							break;
						}
					}
					ErrorF("exec[%d] = handle:%d, presumed offset: %x, size: %d, tiling %d, fenced %d, snooped %d, deleted %d\n",
					       i,
					       kgem->exec[i].handle,
					       (int)kgem->exec[i].offset,
					       found ? kgem_bo_size(found) : -1,
					       found ? found->tiling : -1,
					       (int)(kgem->exec[i].flags & EXEC_OBJECT_NEEDS_FENCE),
					       found ? found->snoop : -1,
					       found ? found->purged : -1);
				}
				for (i = 0; i < kgem->nreloc; i++) {
					ErrorF("reloc[%d] = pos:%d, target:%d, delta:%d, read:%x, write:%x, offset:%x\n",
					       i,
					       (int)kgem->reloc[i].offset,
					       kgem->reloc[i].target_handle,
					       kgem->reloc[i].delta,
					       kgem->reloc[i].read_domains,
					       kgem->reloc[i].write_domain,
					       (int)kgem->reloc[i].presumed_offset);
				}

				if (DEBUG_SYNC) {
					int fd = open("/tmp/batchbuffer", O_WRONLY | O_CREAT | O_APPEND, 0666);
					if (fd != -1) {
						write(fd, kgem->batch, batch_end*sizeof(uint32_t));
						close(fd);
					}

					FatalError("SNA: failed to submit batchbuffer, errno=%d\n", ret);
				}
#endif
			}
		}

		kgem_commit(kgem);
	}
	if (kgem->wedged)
		kgem_cleanup(kgem);

	kgem_reset(kgem);

	assert(kgem->next_request != NULL);
}

void kgem_throttle(struct kgem *kgem)
{
	kgem->need_throttle = 0;
	if (kgem->wedged)
		return;

	kgem->wedged = __kgem_throttle(kgem);
	if (kgem->wedged) {
		printf("Detected a hung GPU, disabling acceleration.\n");
		printf("When reporting this, please include i915_error_state from debugfs and the full dmesg.\n");
	}
}

void kgem_purge_cache(struct kgem *kgem)
{
	struct kgem_bo *bo, *next;
	int i;

	for (i = 0; i < ARRAY_SIZE(kgem->inactive); i++) {
		list_for_each_entry_safe(bo, next, &kgem->inactive[i], list) {
			if (!kgem_bo_is_retained(kgem, bo)) {
				DBG(("%s: purging %d\n",
				     __FUNCTION__, bo->handle));
				kgem_bo_free(kgem, bo);
			}
		}
	}

	kgem->need_purge = false;
}

bool kgem_expire_cache(struct kgem *kgem)
{
	time_t now, expire;
	struct kgem_bo *bo;
	unsigned int size = 0, count = 0;
	bool idle;
	unsigned int i;

	time(&now);

	while (__kgem_freed_bo) {
		bo = __kgem_freed_bo;
		__kgem_freed_bo = *(struct kgem_bo **)bo;
		free(bo);
	}

	while (__kgem_freed_request) {
		struct kgem_request *rq = __kgem_freed_request;
		__kgem_freed_request = *(struct kgem_request **)rq;
		free(rq);
	}

	while (!list_is_empty(&kgem->large_inactive)) {
		kgem_bo_free(kgem,
			     list_first_entry(&kgem->large_inactive,
					      struct kgem_bo, list));

	}

	while (!list_is_empty(&kgem->scanout)) {
		bo = list_first_entry(&kgem->scanout, struct kgem_bo, list);
		if (__kgem_busy(kgem, bo->handle))
			break;

		list_del(&bo->list);
		kgem_bo_clear_scanout(kgem, bo);
		__kgem_bo_destroy(kgem, bo);
	}

	expire = 0;
	list_for_each_entry(bo, &kgem->snoop, list) {
		if (bo->delta) {
			expire = now - MAX_INACTIVE_TIME/2;
			break;
		}

		bo->delta = now;
	}
	if (expire) {
		while (!list_is_empty(&kgem->snoop)) {
			bo = list_last_entry(&kgem->snoop, struct kgem_bo, list);

			if (bo->delta > expire)
				break;

			kgem_bo_free(kgem, bo);
		}
	}
#ifdef DEBUG_MEMORY
	{
		long snoop_size = 0;
		int snoop_count = 0;
		list_for_each_entry(bo, &kgem->snoop, list)
			snoop_count++, snoop_size += bytes(bo);
		ErrorF("%s: still allocated %d bo, %ld bytes, in snoop cache\n",
		       __FUNCTION__, snoop_count, snoop_size);
	}
#endif

	kgem_retire(kgem);
	if (kgem->wedged)
		kgem_cleanup(kgem);

	kgem->expire(kgem);

	if (kgem->need_purge)
		kgem_purge_cache(kgem);

	expire = 0;

	idle = !kgem->need_retire;
	for (i = 0; i < ARRAY_SIZE(kgem->inactive); i++) {
		idle &= list_is_empty(&kgem->inactive[i]);
		list_for_each_entry(bo, &kgem->inactive[i], list) {
			if (bo->delta) {
				expire = now - MAX_INACTIVE_TIME;
				break;
			}

			bo->delta = now;
		}
	}
	if (idle) {
		DBG(("%s: idle\n", __FUNCTION__));
		kgem->need_expire = false;
		return false;
	}
	if (expire == 0)
		return true;

	idle = !kgem->need_retire;
	for (i = 0; i < ARRAY_SIZE(kgem->inactive); i++) {
		struct list preserve;

		list_init(&preserve);
		while (!list_is_empty(&kgem->inactive[i])) {
			bo = list_last_entry(&kgem->inactive[i],
					     struct kgem_bo, list);

			if (bo->delta > expire) {
				idle = false;
				break;
			}

			if (bo->map && bo->delta + MAP_PRESERVE_TIME > expire) {
				idle = false;
				list_move_tail(&bo->list, &preserve);
			} else {
				count++;
				size += bytes(bo);
				kgem_bo_free(kgem, bo);
				DBG(("%s: expiring %d\n",
				     __FUNCTION__, bo->handle));
			}
		}
		if (!list_is_empty(&preserve)) {
			preserve.prev->next = kgem->inactive[i].next;
			kgem->inactive[i].next->prev = preserve.prev;
			kgem->inactive[i].next = preserve.next;
			preserve.next->prev = &kgem->inactive[i];
		}
	}

#ifdef DEBUG_MEMORY
	{
		long inactive_size = 0;
		int inactive_count = 0;
		for (i = 0; i < ARRAY_SIZE(kgem->inactive); i++)
			list_for_each_entry(bo, &kgem->inactive[i], list)
				inactive_count++, inactive_size += bytes(bo);
		ErrorF("%s: still allocated %d bo, %ld bytes, in inactive cache\n",
		       __FUNCTION__, inactive_count, inactive_size);
	}
#endif

	DBG(("%s: expired %d objects, %d bytes, idle? %d\n",
	     __FUNCTION__, count, size, idle));

	kgem->need_expire = !idle;
	return !idle;
	(void)count;
	(void)size;
}

void kgem_cleanup_cache(struct kgem *kgem)
{
	unsigned int i;
	int n;

	/* sync to the most recent request */
	for (n = 0; n < ARRAY_SIZE(kgem->requests); n++) {
		if (!list_is_empty(&kgem->requests[n])) {
			struct kgem_request *rq;
			struct drm_i915_gem_set_domain set_domain;

			rq = list_first_entry(&kgem->requests[n],
					      struct kgem_request,
					      list);

			DBG(("%s: sync on cleanup\n", __FUNCTION__));

			VG_CLEAR(set_domain);
			set_domain.handle = rq->bo->handle;
			set_domain.read_domains = I915_GEM_DOMAIN_GTT;
			set_domain.write_domain = I915_GEM_DOMAIN_GTT;
			(void)drmIoctl(kgem->fd,
				       DRM_IOCTL_I915_GEM_SET_DOMAIN,
				       &set_domain);
		}
	}

	kgem_retire(kgem);
	kgem_cleanup(kgem);

	for (i = 0; i < ARRAY_SIZE(kgem->inactive); i++) {
		while (!list_is_empty(&kgem->inactive[i]))
			kgem_bo_free(kgem,
				     list_last_entry(&kgem->inactive[i],
						     struct kgem_bo, list));
	}

	while (!list_is_empty(&kgem->snoop))
		kgem_bo_free(kgem,
			     list_last_entry(&kgem->snoop,
					     struct kgem_bo, list));

	while (__kgem_freed_bo) {
		struct kgem_bo *bo = __kgem_freed_bo;
		__kgem_freed_bo = *(struct kgem_bo **)bo;
		free(bo);
	}

	kgem->need_purge = false;
	kgem->need_expire = false;
}

static struct kgem_bo *
search_linear_cache(struct kgem *kgem, unsigned int num_pages, unsigned flags)
{
	struct kgem_bo *bo, *first = NULL;
	bool use_active = (flags & CREATE_INACTIVE) == 0;
	struct list *cache;

	DBG(("%s: num_pages=%d, flags=%x, use_active? %d\n",
	     __FUNCTION__, num_pages, flags, use_active));

	if (num_pages >= MAX_CACHE_SIZE / PAGE_SIZE)
		return NULL;

	if (!use_active && list_is_empty(inactive(kgem, num_pages))) {
		DBG(("%s: inactive and cache bucket empty\n",
		     __FUNCTION__));

		if (flags & CREATE_NO_RETIRE) {
			DBG(("%s: can not retire\n", __FUNCTION__));
			return NULL;
		}

		if (list_is_empty(active(kgem, num_pages, I915_TILING_NONE))) {
			DBG(("%s: active cache bucket empty\n", __FUNCTION__));
			return NULL;
		}

		if (!__kgem_throttle_retire(kgem, flags)) {
			DBG(("%s: nothing retired\n", __FUNCTION__));
			return NULL;
		}

		if (list_is_empty(inactive(kgem, num_pages))) {
			DBG(("%s: active cache bucket still empty after retire\n",
			     __FUNCTION__));
			return NULL;
		}
	}

	if (!use_active && flags & (CREATE_CPU_MAP | CREATE_GTT_MAP)) {
		int for_cpu = !!(flags & CREATE_CPU_MAP);
		DBG(("%s: searching for inactive %s map\n",
		     __FUNCTION__, for_cpu ? "cpu" : "gtt"));
		cache = &kgem->vma[for_cpu].inactive[cache_bucket(num_pages)];
		list_for_each_entry(bo, cache, vma) {
			assert(IS_CPU_MAP(bo->map) == for_cpu);
			assert(bucket(bo) == cache_bucket(num_pages));
			assert(bo->proxy == NULL);
			assert(bo->rq == NULL);
			assert(bo->exec == NULL);
			assert(!bo->scanout);

			if (num_pages > num_pages(bo)) {
				DBG(("inactive too small: %d < %d\n",
				     num_pages(bo), num_pages));
				continue;
			}

			if (bo->purged && !kgem_bo_clear_purgeable(kgem, bo)) {
				kgem_bo_free(kgem, bo);
				break;
			}

			if (I915_TILING_NONE != bo->tiling &&
			    !gem_set_tiling(kgem->fd, bo->handle,
					    I915_TILING_NONE, 0))
				continue;

			kgem_bo_remove_from_inactive(kgem, bo);

			bo->tiling = I915_TILING_NONE;
			bo->pitch = 0;
			bo->delta = 0;
			DBG(("  %s: found handle=%d (num_pages=%d) in linear vma cache\n",
			     __FUNCTION__, bo->handle, num_pages(bo)));
			assert(use_active || bo->domain != DOMAIN_GPU);
			assert(!bo->needs_flush);
			ASSERT_MAYBE_IDLE(kgem, bo->handle, !use_active);
			return bo;
		}

		if (flags & CREATE_EXACT)
			return NULL;

		if (flags & CREATE_CPU_MAP && !kgem->has_llc)
			return NULL;
	}

	cache = use_active ? active(kgem, num_pages, I915_TILING_NONE) : inactive(kgem, num_pages);
	list_for_each_entry(bo, cache, list) {
		assert(bo->refcnt == 0);
		assert(bo->reusable);
		assert(!!bo->rq == !!use_active);
		assert(bo->proxy == NULL);
		assert(!bo->scanout);

		if (num_pages > num_pages(bo))
			continue;

		if (use_active &&
		    kgem->gen <= 040 &&
		    bo->tiling != I915_TILING_NONE)
			continue;

		if (bo->purged && !kgem_bo_clear_purgeable(kgem, bo)) {
			kgem_bo_free(kgem, bo);
			break;
		}

		if (I915_TILING_NONE != bo->tiling) {
			if (flags & (CREATE_CPU_MAP | CREATE_GTT_MAP))
				continue;

			if (first)
				continue;

			if (!gem_set_tiling(kgem->fd, bo->handle,
					    I915_TILING_NONE, 0))
				continue;

			bo->tiling = I915_TILING_NONE;
			bo->pitch = 0;
		}

		if (bo->map) {
			if (flags & (CREATE_CPU_MAP | CREATE_GTT_MAP)) {
				int for_cpu = !!(flags & CREATE_CPU_MAP);
				if (IS_CPU_MAP(bo->map) != for_cpu) {
					if (first != NULL)
						break;

					first = bo;
					continue;
				}
			} else {
				if (first != NULL)
					break;

				first = bo;
				continue;
			}
		} else {
			if (flags & (CREATE_CPU_MAP | CREATE_GTT_MAP)) {
				if (first != NULL)
					break;

				first = bo;
				continue;
			}
		}

		if (use_active)
			kgem_bo_remove_from_active(kgem, bo);
		else
			kgem_bo_remove_from_inactive(kgem, bo);

		assert(bo->tiling == I915_TILING_NONE);
		bo->pitch = 0;
		bo->delta = 0;
		DBG(("  %s: found handle=%d (num_pages=%d) in linear %s cache\n",
		     __FUNCTION__, bo->handle, num_pages(bo),
		     use_active ? "active" : "inactive"));
		assert(list_is_empty(&bo->list));
		assert(use_active || bo->domain != DOMAIN_GPU);
		assert(!bo->needs_flush || use_active);
		ASSERT_MAYBE_IDLE(kgem, bo->handle, !use_active);
		return bo;
	}

	if (first) {
		assert(first->tiling == I915_TILING_NONE);

		if (use_active)
			kgem_bo_remove_from_active(kgem, first);
		else
			kgem_bo_remove_from_inactive(kgem, first);

		first->pitch = 0;
		first->delta = 0;
		DBG(("  %s: found handle=%d (near-miss) (num_pages=%d) in linear %s cache\n",
		     __FUNCTION__, first->handle, num_pages(first),
		     use_active ? "active" : "inactive"));
		assert(list_is_empty(&first->list));
		assert(use_active || first->domain != DOMAIN_GPU);
		assert(!first->needs_flush || use_active);
		ASSERT_MAYBE_IDLE(kgem, first->handle, !use_active);
		return first;
	}

	return NULL;
}


struct kgem_bo *kgem_create_linear(struct kgem *kgem, int size, unsigned flags)
{
	struct kgem_bo *bo;
	uint32_t handle;

	DBG(("%s(%d)\n", __FUNCTION__, size));

	if (flags & CREATE_GTT_MAP && kgem->has_llc) {
		flags &= ~CREATE_GTT_MAP;
		flags |= CREATE_CPU_MAP;
	}

	size = (size + PAGE_SIZE - 1) / PAGE_SIZE;
	bo = search_linear_cache(kgem, size, CREATE_INACTIVE | flags);
	if (bo) {
		assert(bo->domain != DOMAIN_GPU);
		ASSERT_IDLE(kgem, bo->handle);
		bo->refcnt = 1;
		return bo;
	}

	if (flags & CREATE_CACHED)
		return NULL;

	handle = gem_create(kgem->fd, size);
	if (handle == 0)
		return NULL;

	DBG(("%s: new handle=%d, num_pages=%d\n", __FUNCTION__, handle, size));
	bo = __kgem_bo_alloc(handle, size);
	if (bo == NULL) {
		gem_close(kgem->fd, handle);
		return NULL;
	}

	debug_alloc__bo(kgem, bo);
	return bo;
}

inline int kgem_bo_fenced_size(struct kgem *kgem, struct kgem_bo *bo)
{
	unsigned int size;

	assert(bo->tiling);
	assert(kgem->gen < 040);

	if (kgem->gen < 030)
		size = 512 * 1024;
	else
		size = 1024 * 1024;
	while (size < bytes(bo))
		size *= 2;

	return size;
}

#if 0

struct kgem_bo *kgem_create_2d(struct kgem *kgem,
			       int width,
			       int height,
			       int bpp,
			       int tiling,
			       uint32_t flags)
{
	struct list *cache;
	struct kgem_bo *bo;
	uint32_t pitch, untiled_pitch, tiled_height, size;
	uint32_t handle;
	int i, bucket, retry;

	if (tiling < 0)
		tiling = -tiling, flags |= CREATE_EXACT;

	DBG(("%s(%dx%d, bpp=%d, tiling=%d, exact=%d, inactive=%d, cpu-mapping=%d, gtt-mapping=%d, scanout?=%d, prime?=%d, temp?=%d)\n", __FUNCTION__,
	     width, height, bpp, tiling,
	     !!(flags & CREATE_EXACT),
	     !!(flags & CREATE_INACTIVE),
	     !!(flags & CREATE_CPU_MAP),
	     !!(flags & CREATE_GTT_MAP),
	     !!(flags & CREATE_SCANOUT),
	     !!(flags & CREATE_PRIME),
	     !!(flags & CREATE_TEMPORARY)));

	size = kgem_surface_size(kgem, kgem->has_relaxed_fencing, flags,
				 width, height, bpp, tiling, &pitch);
	assert(size && size <= kgem->max_object_size);
	size /= PAGE_SIZE;
	bucket = cache_bucket(size);

	if (flags & CREATE_SCANOUT) {
		assert((flags & CREATE_INACTIVE) == 0);
		list_for_each_entry_reverse(bo, &kgem->scanout, list) {
			assert(bo->scanout);
			assert(bo->delta);
			assert(!bo->purged);

			if (size > num_pages(bo) || num_pages(bo) > 2*size)
				continue;

			if (bo->tiling != tiling ||
			    (tiling != I915_TILING_NONE && bo->pitch != pitch)) {
				if (!gem_set_tiling(kgem->fd, bo->handle,
						    tiling, pitch))
					continue;

				bo->tiling = tiling;
				bo->pitch = pitch;
			}

			list_del(&bo->list);

			bo->unique_id = kgem_get_unique_id(kgem);
			DBG(("  1:from scanout: pitch=%d, tiling=%d, handle=%d, id=%d\n",
			     bo->pitch, bo->tiling, bo->handle, bo->unique_id));
			assert(bo->pitch*kgem_aligned_height(kgem, height, bo->tiling) <= kgem_bo_size(bo));
			bo->refcnt = 1;
			return bo;
		}
	}

	if (bucket >= NUM_CACHE_BUCKETS) {
		DBG(("%s: large bo num pages=%d, bucket=%d\n",
		     __FUNCTION__, size, bucket));

		if (flags & CREATE_INACTIVE)
			goto large_inactive;

		tiled_height = kgem_aligned_height(kgem, height, tiling);
		untiled_pitch = kgem_untiled_pitch(kgem, width, bpp, flags);

		list_for_each_entry(bo, &kgem->large, list) {
			assert(!bo->purged);
			assert(!bo->scanout);
			assert(bo->refcnt == 0);
			assert(bo->reusable);
			assert(bo->flush == true);

			if (kgem->gen < 040) {
				if (bo->pitch < pitch) {
					DBG(("tiled and pitch too small: tiling=%d, (want %d), pitch=%d, need %d\n",
					     bo->tiling, tiling,
					     bo->pitch, pitch));
					continue;
				}

				if (bo->pitch * tiled_height > bytes(bo))
					continue;
			} else {
				if (num_pages(bo) < size)
					continue;

				if (bo->pitch != pitch || bo->tiling != tiling) {
					if (!gem_set_tiling(kgem->fd, bo->handle,
							    tiling, pitch))
						continue;

					bo->pitch = pitch;
					bo->tiling = tiling;
				}
			}

			kgem_bo_remove_from_active(kgem, bo);

			bo->unique_id = kgem_get_unique_id(kgem);
			bo->delta = 0;
			DBG(("  1:from active: pitch=%d, tiling=%d, handle=%d, id=%d\n",
			     bo->pitch, bo->tiling, bo->handle, bo->unique_id));
			assert(bo->pitch*kgem_aligned_height(kgem, height, bo->tiling) <= kgem_bo_size(bo));
			bo->refcnt = 1;
			return bo;
		}

large_inactive:
		list_for_each_entry(bo, &kgem->large_inactive, list) {
			assert(bo->refcnt == 0);
			assert(bo->reusable);
			assert(!bo->scanout);

			if (size > num_pages(bo))
				continue;

			if (bo->tiling != tiling ||
			    (tiling != I915_TILING_NONE && bo->pitch != pitch)) {
				if (!gem_set_tiling(kgem->fd, bo->handle,
						    tiling, pitch))
					continue;

				bo->tiling = tiling;
				bo->pitch = pitch;
			}

			if (bo->purged && !kgem_bo_clear_purgeable(kgem, bo)) {
				kgem_bo_free(kgem, bo);
				break;
			}

			list_del(&bo->list);

			bo->unique_id = kgem_get_unique_id(kgem);
			bo->pitch = pitch;
			bo->delta = 0;
			DBG(("  1:from large inactive: pitch=%d, tiling=%d, handle=%d, id=%d\n",
			     bo->pitch, bo->tiling, bo->handle, bo->unique_id));
			assert(bo->pitch*kgem_aligned_height(kgem, height, bo->tiling) <= kgem_bo_size(bo));
			bo->refcnt = 1;
			return bo;
		}

		goto create;
	}

	if (flags & (CREATE_CPU_MAP | CREATE_GTT_MAP)) {
		int for_cpu = !!(flags & CREATE_CPU_MAP);
		if (kgem->has_llc && tiling == I915_TILING_NONE)
			for_cpu = 1;
		/* We presume that we will need to upload to this bo,
		 * and so would prefer to have an active VMA.
		 */
		cache = &kgem->vma[for_cpu].inactive[bucket];
		do {
			list_for_each_entry(bo, cache, vma) {
				assert(bucket(bo) == bucket);
				assert(bo->refcnt == 0);
				assert(!bo->scanout);
				assert(bo->map);
				assert(IS_CPU_MAP(bo->map) == for_cpu);
				assert(bo->rq == NULL);
				assert(list_is_empty(&bo->request));
				assert(bo->flush == false);

				if (size > num_pages(bo)) {
					DBG(("inactive too small: %d < %d\n",
					     num_pages(bo), size));
					continue;
				}

				if (bo->tiling != tiling ||
				    (tiling != I915_TILING_NONE && bo->pitch != pitch)) {
					DBG(("inactive vma with wrong tiling: %d < %d\n",
					     bo->tiling, tiling));
					continue;
				}

				if (bo->purged && !kgem_bo_clear_purgeable(kgem, bo)) {
					kgem_bo_free(kgem, bo);
					break;
				}

				bo->pitch = pitch;
				bo->delta = 0;
				bo->unique_id = kgem_get_unique_id(kgem);

				kgem_bo_remove_from_inactive(kgem, bo);

				DBG(("  from inactive vma: pitch=%d, tiling=%d: handle=%d, id=%d\n",
				     bo->pitch, bo->tiling, bo->handle, bo->unique_id));
				assert(bo->reusable);
				assert(bo->domain != DOMAIN_GPU);
				ASSERT_IDLE(kgem, bo->handle);
				assert(bo->pitch*kgem_aligned_height(kgem, height, bo->tiling) <= kgem_bo_size(bo));
				bo->refcnt = 1;
				return bo;
			}
		} while (!list_is_empty(cache) &&
			 __kgem_throttle_retire(kgem, flags));

		if (flags & CREATE_CPU_MAP && !kgem->has_llc)
			goto create;
	}

	if (flags & CREATE_INACTIVE)
		goto skip_active_search;

	/* Best active match */
	retry = NUM_CACHE_BUCKETS - bucket;
	if (retry > 3 && (flags & CREATE_TEMPORARY) == 0)
		retry = 3;
search_again:
	assert(bucket < NUM_CACHE_BUCKETS);
	cache = &kgem->active[bucket][tiling];
	if (tiling) {
		tiled_height = kgem_aligned_height(kgem, height, tiling);
		list_for_each_entry(bo, cache, list) {
			assert(!bo->purged);
			assert(bo->refcnt == 0);
			assert(bucket(bo) == bucket);
			assert(bo->reusable);
			assert(bo->tiling == tiling);
			assert(bo->flush == false);
			assert(!bo->scanout);

			if (kgem->gen < 040) {
				if (bo->pitch < pitch) {
					DBG(("tiled and pitch too small: tiling=%d, (want %d), pitch=%d, need %d\n",
					     bo->tiling, tiling,
					     bo->pitch, pitch));
					continue;
				}

				if (bo->pitch * tiled_height > bytes(bo))
					continue;
			} else {
				if (num_pages(bo) < size)
					continue;

				if (bo->pitch != pitch) {
					if (!gem_set_tiling(kgem->fd,
							    bo->handle,
							    tiling, pitch))
						continue;

					bo->pitch = pitch;
				}
			}

			kgem_bo_remove_from_active(kgem, bo);

			bo->unique_id = kgem_get_unique_id(kgem);
			bo->delta = 0;
			DBG(("  1:from active: pitch=%d, tiling=%d, handle=%d, id=%d\n",
			     bo->pitch, bo->tiling, bo->handle, bo->unique_id));
			assert(bo->pitch*kgem_aligned_height(kgem, height, bo->tiling) <= kgem_bo_size(bo));
			bo->refcnt = 1;
			return bo;
		}
	} else {
		list_for_each_entry(bo, cache, list) {
			assert(bucket(bo) == bucket);
			assert(!bo->purged);
			assert(bo->refcnt == 0);
			assert(bo->reusable);
			assert(!bo->scanout);
			assert(bo->tiling == tiling);
			assert(bo->flush == false);

			if (num_pages(bo) < size)
				continue;

			kgem_bo_remove_from_active(kgem, bo);

			bo->pitch = pitch;
			bo->unique_id = kgem_get_unique_id(kgem);
			bo->delta = 0;
			DBG(("  1:from active: pitch=%d, tiling=%d, handle=%d, id=%d\n",
			     bo->pitch, bo->tiling, bo->handle, bo->unique_id));
			assert(bo->pitch*kgem_aligned_height(kgem, height, bo->tiling) <= kgem_bo_size(bo));
			bo->refcnt = 1;
			return bo;
		}
	}

	if (--retry && flags & CREATE_EXACT) {
		if (kgem->gen >= 040) {
			for (i = I915_TILING_NONE; i <= I915_TILING_Y; i++) {
				if (i == tiling)
					continue;

				cache = &kgem->active[bucket][i];
				list_for_each_entry(bo, cache, list) {
					assert(!bo->purged);
					assert(bo->refcnt == 0);
					assert(bo->reusable);
					assert(!bo->scanout);
					assert(bo->flush == false);

					if (num_pages(bo) < size)
						continue;

					if (!gem_set_tiling(kgem->fd,
							    bo->handle,
							    tiling, pitch))
						continue;

					kgem_bo_remove_from_active(kgem, bo);

					bo->unique_id = kgem_get_unique_id(kgem);
					bo->pitch = pitch;
					bo->tiling = tiling;
					bo->delta = 0;
					DBG(("  1:from active: pitch=%d, tiling=%d, handle=%d, id=%d\n",
					     bo->pitch, bo->tiling, bo->handle, bo->unique_id));
					assert(bo->pitch*kgem_aligned_height(kgem, height, bo->tiling) <= kgem_bo_size(bo));
					bo->refcnt = 1;
					return bo;
				}
			}
		}

		bucket++;
		goto search_again;
	}

	if ((flags & CREATE_EXACT) == 0) { /* allow an active near-miss? */
		untiled_pitch = kgem_untiled_pitch(kgem, width, bpp, flags);
		i = tiling;
		while (--i >= 0) {
			tiled_height = kgem_surface_size(kgem, kgem->has_relaxed_fencing, flags,
							 width, height, bpp, tiling, &pitch);
			cache = active(kgem, tiled_height / PAGE_SIZE, i);
			tiled_height = kgem_aligned_height(kgem, height, i);
			list_for_each_entry(bo, cache, list) {
				assert(!bo->purged);
				assert(bo->refcnt == 0);
				assert(bo->reusable);
				assert(!bo->scanout);
				assert(bo->flush == false);

				if (bo->tiling) {
					if (bo->pitch < pitch) {
						DBG(("tiled and pitch too small: tiling=%d, (want %d), pitch=%d, need %d\n",
						     bo->tiling, tiling,
						     bo->pitch, pitch));
						continue;
					}
				} else
					bo->pitch = untiled_pitch;

				if (bo->pitch * tiled_height > bytes(bo))
					continue;

				kgem_bo_remove_from_active(kgem, bo);

				bo->unique_id = kgem_get_unique_id(kgem);
				bo->delta = 0;
				DBG(("  1:from active: pitch=%d, tiling=%d, handle=%d, id=%d\n",
				     bo->pitch, bo->tiling, bo->handle, bo->unique_id));
				assert(bo->pitch*kgem_aligned_height(kgem, height, bo->tiling) <= kgem_bo_size(bo));
				bo->refcnt = 1;
				return bo;
			}
		}
	}

skip_active_search:
	bucket = cache_bucket(size);
	retry = NUM_CACHE_BUCKETS - bucket;
	if (retry > 3)
		retry = 3;
search_inactive:
	/* Now just look for a close match and prefer any currently active */
	assert(bucket < NUM_CACHE_BUCKETS);
	cache = &kgem->inactive[bucket];
	list_for_each_entry(bo, cache, list) {
		assert(bucket(bo) == bucket);
		assert(bo->reusable);
		assert(!bo->scanout);
		assert(bo->flush == false);

		if (size > num_pages(bo)) {
			DBG(("inactive too small: %d < %d\n",
			     num_pages(bo), size));
			continue;
		}

		if (bo->tiling != tiling ||
		    (tiling != I915_TILING_NONE && bo->pitch != pitch)) {
			if (!gem_set_tiling(kgem->fd, bo->handle,
					    tiling, pitch))
				continue;

			if (bo->map)
				kgem_bo_release_map(kgem, bo);
		}

		if (bo->purged && !kgem_bo_clear_purgeable(kgem, bo)) {
			kgem_bo_free(kgem, bo);
			break;
		}

		kgem_bo_remove_from_inactive(kgem, bo);

		bo->pitch = pitch;
		bo->tiling = tiling;

		bo->delta = 0;
		bo->unique_id = kgem_get_unique_id(kgem);
		assert(bo->pitch);
		DBG(("  from inactive: pitch=%d, tiling=%d: handle=%d, id=%d\n",
		     bo->pitch, bo->tiling, bo->handle, bo->unique_id));
		assert(bo->refcnt == 0);
		assert(bo->reusable);
		assert((flags & CREATE_INACTIVE) == 0 || bo->domain != DOMAIN_GPU);
		ASSERT_MAYBE_IDLE(kgem, bo->handle, flags & CREATE_INACTIVE);
		assert(bo->pitch*kgem_aligned_height(kgem, height, bo->tiling) <= kgem_bo_size(bo));
		bo->refcnt = 1;
		return bo;
	}

	if (flags & CREATE_INACTIVE &&
	    !list_is_empty(&kgem->active[bucket][tiling]) &&
	    __kgem_throttle_retire(kgem, flags)) {
		flags &= ~CREATE_INACTIVE;
		goto search_inactive;
	}

	if (--retry) {
		bucket++;
		flags &= ~CREATE_INACTIVE;
		goto search_inactive;
	}

create:
	if (bucket >= NUM_CACHE_BUCKETS)
		size = ALIGN(size, 1024);
	handle = gem_create(kgem->fd, size);
	if (handle == 0)
		return NULL;

	bo = __kgem_bo_alloc(handle, size);
	if (!bo) {
		gem_close(kgem->fd, handle);
		return NULL;
	}

	bo->domain = DOMAIN_CPU;
	bo->unique_id = kgem_get_unique_id(kgem);
	bo->pitch = pitch;
	if (tiling != I915_TILING_NONE &&
	    gem_set_tiling(kgem->fd, handle, tiling, pitch))
		bo->tiling = tiling;
	if (bucket >= NUM_CACHE_BUCKETS) {
		DBG(("%s: marking large bo for automatic flushing\n",
		     __FUNCTION__));
		bo->flush = true;
	}

	assert(bytes(bo) >= bo->pitch * kgem_aligned_height(kgem, height, bo->tiling));

	debug_alloc__bo(kgem, bo);

	DBG(("  new pitch=%d, tiling=%d, handle=%d, id=%d, num_pages=%d [%d], bucket=%d\n",
	     bo->pitch, bo->tiling, bo->handle, bo->unique_id,
	     size, num_pages(bo), bucket(bo)));
	return bo;
}

struct kgem_bo *kgem_create_cpu_2d(struct kgem *kgem,
				   int width,
				   int height,
				   int bpp,
				   uint32_t flags)
{
	struct kgem_bo *bo;
	int stride, size;

	if (DBG_NO_CPU)
		return NULL;

	DBG(("%s(%dx%d, bpp=%d)\n", __FUNCTION__, width, height, bpp));

	if (kgem->has_llc) {
		bo = kgem_create_2d(kgem, width, height, bpp,
				    I915_TILING_NONE, flags);
		if (bo == NULL)
			return bo;

		assert(bo->tiling == I915_TILING_NONE);

		if (kgem_bo_map__cpu(kgem, bo) == NULL) {
			kgem_bo_destroy(kgem, bo);
			return NULL;
		}

		return bo;
	}

	assert(width > 0 && height > 0);
	stride = ALIGN(width, 2) * bpp >> 3;
	stride = ALIGN(stride, 4);
	size = stride * ALIGN(height, 2);
	assert(size >= PAGE_SIZE);

	DBG(("%s: %dx%d, %d bpp, stride=%d\n",
	     __FUNCTION__, width, height, bpp, stride));

	bo = search_snoop_cache(kgem, NUM_PAGES(size), 0);
	if (bo) {
		assert(bo->tiling == I915_TILING_NONE);
		assert(bo->snoop);
		bo->refcnt = 1;
		bo->pitch = stride;
		bo->unique_id = kgem_get_unique_id(kgem);
		return bo;
	}

	if (kgem->has_cacheing) {
		bo = kgem_create_linear(kgem, size, flags);
		if (bo == NULL)
			return NULL;

		assert(bo->tiling == I915_TILING_NONE);

		if (!gem_set_cacheing(kgem->fd, bo->handle, SNOOPED)) {
			kgem_bo_destroy(kgem, bo);
			return NULL;
		}
		bo->snoop = true;

		if (kgem_bo_map__cpu(kgem, bo) == NULL) {
			kgem_bo_destroy(kgem, bo);
			return NULL;
		}

		bo->pitch = stride;
		bo->unique_id = kgem_get_unique_id(kgem);
		return bo;
	}

	if (kgem->has_userptr) {
		void *ptr;

		/* XXX */
		//if (posix_memalign(&ptr, 64, ALIGN(size, 64)))
		if (posix_memalign(&ptr, PAGE_SIZE, ALIGN(size, PAGE_SIZE)))
			return NULL;

		bo = kgem_create_map(kgem, ptr, size, false);
		if (bo == NULL) {
			free(ptr);
			return NULL;
		}

		bo->map = MAKE_USER_MAP(ptr);
		bo->pitch = stride;
		bo->unique_id = kgem_get_unique_id(kgem);
		return bo;
	}

		return NULL;
}
 

#endif


void _kgem_bo_destroy(struct kgem *kgem, struct kgem_bo *bo)
{
	DBG(("%s: handle=%d, proxy? %d\n",
	     __FUNCTION__, bo->handle, bo->proxy != NULL));

	if (bo->proxy) {
		_list_del(&bo->vma);
		_list_del(&bo->request);
		if (bo->io && bo->exec == NULL)
			_kgem_bo_delete_buffer(kgem, bo);
		kgem_bo_unref(kgem, bo->proxy);
		kgem_bo_binding_free(kgem, bo);
		free(bo);
		return;
		}

	__kgem_bo_destroy(kgem, bo);
}




































uint32_t kgem_add_reloc(struct kgem *kgem,
			uint32_t pos,
			struct kgem_bo *bo,
			uint32_t read_write_domain,
			uint32_t delta)
{
	int index;

	DBG(("%s: handle=%d, pos=%d, delta=%d, domains=%08x\n",
	     __FUNCTION__, bo ? bo->handle : 0, pos, delta, read_write_domain));

	assert((read_write_domain & 0x7fff) == 0 || bo != NULL);

	index = kgem->nreloc++;
	assert(index < ARRAY_SIZE(kgem->reloc));
	kgem->reloc[index].offset = pos * sizeof(kgem->batch[0]);
	if (bo) {
		assert(bo->refcnt);
		assert(!bo->purged);

		while (bo->proxy) {
			DBG(("%s: adding proxy [delta=%d] for handle=%d\n",
			     __FUNCTION__, bo->delta, bo->handle));
			delta += bo->delta;
			assert(bo->handle == bo->proxy->handle);
			/* need to release the cache upon batch submit */
			if (bo->exec == NULL) {
				list_move_tail(&bo->request,
					       &kgem->next_request->buffers);
				bo->rq = MAKE_REQUEST(kgem->next_request,
						      kgem->ring);
				bo->exec = &_kgem_dummy_exec;
		}

			if (read_write_domain & 0x7fff && !bo->dirty)
				__kgem_bo_mark_dirty(bo);

			bo = bo->proxy;
			assert(bo->refcnt);
			assert(!bo->purged);
		}

		if (bo->exec == NULL)
			kgem_add_bo(kgem, bo);
		assert(bo->rq == MAKE_REQUEST(kgem->next_request, kgem->ring));
		assert(RQ_RING(bo->rq) == kgem->ring);

		if (kgem->gen < 040 && read_write_domain & KGEM_RELOC_FENCED) {
			if (bo->tiling &&
			    (bo->exec->flags & EXEC_OBJECT_NEEDS_FENCE) == 0) {
				assert(kgem->nfence < kgem->fence_max);
				kgem->aperture_fenced +=
					kgem_bo_fenced_size(kgem, bo);
				kgem->nfence++;
			}
			bo->exec->flags |= EXEC_OBJECT_NEEDS_FENCE;
		}

		kgem->reloc[index].delta = delta;
		kgem->reloc[index].target_handle = bo->target_handle;
		kgem->reloc[index].presumed_offset = bo->presumed_offset;

		if (read_write_domain & 0x7fff && !bo->dirty) {
			assert(!bo->snoop || kgem->can_blt_cpu);
			__kgem_bo_mark_dirty(bo);
		}

		delta += bo->presumed_offset;
	} else {
		kgem->reloc[index].delta = delta;
		kgem->reloc[index].target_handle = ~0U;
		kgem->reloc[index].presumed_offset = 0;
		if (kgem->nreloc__self < 256)
			kgem->reloc__self[kgem->nreloc__self++] = index;
		}
	kgem->reloc[index].read_domains = read_write_domain >> 16;
	kgem->reloc[index].write_domain = read_write_domain & 0x7fff;

	return delta;
}

static void kgem_trim_vma_cache(struct kgem *kgem, int type, int bucket)
{
	int i, j;

	DBG(("%s: type=%d, count=%d (bucket: %d)\n",
	     __FUNCTION__, type, kgem->vma[type].count, bucket));
	if (kgem->vma[type].count <= 0)
	       return;

	if (kgem->need_purge)
		kgem_purge_cache(kgem);

	/* vma are limited on a per-process basis to around 64k.
	 * This includes all malloc arenas as well as other file
	 * mappings. In order to be fair and not hog the cache,
	 * and more importantly not to exhaust that limit and to
	 * start failing mappings, we keep our own number of open
	 * vma to within a conservative value.
	 */
	i = 0;
	while (kgem->vma[type].count > 0) {
		struct kgem_bo *bo = NULL;

		for (j = 0;
		     bo == NULL && j < ARRAY_SIZE(kgem->vma[type].inactive);
		     j++) {
			struct list *head = &kgem->vma[type].inactive[i++%ARRAY_SIZE(kgem->vma[type].inactive)];
			if (!list_is_empty(head))
				bo = list_last_entry(head, struct kgem_bo, vma);
	}
		if (bo == NULL)
			break;

		DBG(("%s: discarding inactive %s vma cache for %d\n",
		     __FUNCTION__,
		     IS_CPU_MAP(bo->map) ? "CPU" : "GTT", bo->handle));
		assert(IS_CPU_MAP(bo->map) == type);
		assert(bo->map);
			assert(bo->rq == NULL);

		VG(if (type) VALGRIND_MAKE_MEM_NOACCESS(MAP(bo->map), bytes(bo)));
//		munmap(MAP(bo->map), bytes(bo));
		bo->map = NULL;
		list_del(&bo->vma);
		kgem->vma[type].count--;

		if (!bo->purged && !kgem_bo_set_purgeable(kgem, bo)) {
			DBG(("%s: freeing unpurgeable old mapping\n",
			     __FUNCTION__));
				kgem_bo_free(kgem, bo);
			}
	}
}


void *kgem_bo_map(struct kgem *kgem, struct kgem_bo *bo)
{
	void *ptr;

	DBG(("%s: handle=%d, offset=%d, tiling=%d, map=%p, domain=%d\n", __FUNCTION__,
	     bo->handle, bo->presumed_offset, bo->tiling, bo->map, bo->domain));

	assert(!bo->purged);
	assert(bo->proxy == NULL);
	assert(list_is_empty(&bo->list));
	assert(bo->exec == NULL);

	if (bo->tiling == I915_TILING_NONE && !bo->scanout &&
	    (kgem->has_llc || bo->domain == DOMAIN_CPU)) {
		DBG(("%s: converting request for GTT map into CPU map\n",
		     __FUNCTION__));
		ptr = kgem_bo_map__cpu(kgem, bo);
		kgem_bo_sync__cpu(kgem, bo);
		return ptr;
	}

	if (IS_CPU_MAP(bo->map))
		kgem_bo_release_map(kgem, bo);

	ptr = bo->map;
	if (ptr == NULL) {
		assert(kgem_bo_size(bo) <= kgem->aperture_mappable / 2);
		assert(kgem->gen != 021 || bo->tiling != I915_TILING_Y);

		kgem_trim_vma_cache(kgem, MAP_GTT, bucket(bo));

		ptr = __kgem_bo_map__gtt(kgem, bo);
		if (ptr == NULL)
			return NULL;

		/* Cache this mapping to avoid the overhead of an
		 * excruciatingly slow GTT pagefault. This is more an
		 * issue with compositing managers which need to frequently
		 * flush CPU damage to their GPU bo.
		 */
		bo->map = ptr;
		DBG(("%s: caching GTT vma for %d\n", __FUNCTION__, bo->handle));
		}

	if (bo->domain != DOMAIN_GTT) {
		struct drm_i915_gem_set_domain set_domain;

		DBG(("%s: sync: needs_flush? %d, domain? %d, busy? %d\n", __FUNCTION__,
		     bo->needs_flush, bo->domain, __kgem_busy(kgem, bo->handle)));

		/* XXX use PROT_READ to avoid the write flush? */

		VG_CLEAR(set_domain);
		set_domain.handle = bo->handle;
		set_domain.read_domains = I915_GEM_DOMAIN_GTT;
		set_domain.write_domain = I915_GEM_DOMAIN_GTT;
		if (drmIoctl(kgem->fd, DRM_IOCTL_I915_GEM_SET_DOMAIN, &set_domain) == 0) {
			kgem_bo_retire(kgem, bo);
			bo->domain = DOMAIN_GTT;
		}
		}

	return ptr;
}

void *kgem_bo_map__gtt(struct kgem *kgem, struct kgem_bo *bo)
{
	void *ptr;

	DBG(("%s: handle=%d, offset=%d, tiling=%d, map=%p, domain=%d\n", __FUNCTION__,
	     bo->handle, bo->presumed_offset, bo->tiling, bo->map, bo->domain));

	assert(!bo->purged);
	assert(bo->exec == NULL);
	assert(list_is_empty(&bo->list));

	if (IS_CPU_MAP(bo->map))
		kgem_bo_release_map(kgem, bo);

	ptr = bo->map;
	if (ptr == NULL) {
		assert(bytes(bo) <= kgem->aperture_mappable / 4);

		kgem_trim_vma_cache(kgem, MAP_GTT, bucket(bo));

		ptr = __kgem_bo_map__gtt(kgem, bo);
		if (ptr == NULL)
			return NULL;

		/* Cache this mapping to avoid the overhead of an
		 * excruciatingly slow GTT pagefault. This is more an
		 * issue with compositing managers which need to frequently
		 * flush CPU damage to their GPU bo.
		 */
		bo->map = ptr;
		DBG(("%s: caching GTT vma for %d\n", __FUNCTION__, bo->handle));
	}

	return ptr;
}


void *kgem_bo_map__cpu(struct kgem *kgem, struct kgem_bo *bo)
{
	struct drm_i915_gem_mmap mmap_arg;

	DBG(("%s(handle=%d, size=%d, mapped? %d)\n",
	     __FUNCTION__, bo->handle, bytes(bo), (int)__MAP_TYPE(bo->map)));
	assert(!bo->purged);
	assert(list_is_empty(&bo->list));
	assert(!bo->scanout);
	assert(bo->proxy == NULL);

	if (IS_CPU_MAP(bo->map))
		return MAP(bo->map);

	if (bo->map)
		kgem_bo_release_map(kgem, bo);

	kgem_trim_vma_cache(kgem, MAP_CPU, bucket(bo));

retry:
	VG_CLEAR(mmap_arg);
	mmap_arg.handle = bo->handle;
	mmap_arg.offset = 0;
	mmap_arg.size = bytes(bo);
	if (drmIoctl(kgem->fd, DRM_IOCTL_I915_GEM_MMAP, &mmap_arg)) {
		printf("%s: failed to mmap %d, %d bytes, into CPU domain: %d\n",
		       __FUNCTION__, bo->handle, bytes(bo), 0);
		if (__kgem_throttle_retire(kgem, 0))
			goto retry;

		if (kgem->need_expire) {
			kgem_cleanup_cache(kgem);
			goto retry;
		}

		return NULL;
	}

	VG(VALGRIND_MAKE_MEM_DEFINED(mmap_arg.addr_ptr, bytes(bo)));

	DBG(("%s: caching CPU vma for %d\n", __FUNCTION__, bo->handle));
	bo->map = MAKE_CPU_MAP(mmap_arg.addr_ptr);
	return (void *)(uintptr_t)mmap_arg.addr_ptr;
}

void kgem_bo_sync__cpu(struct kgem *kgem, struct kgem_bo *bo)
{
	assert(bo->proxy == NULL);
	kgem_bo_submit(kgem, bo);

	if (bo->domain != DOMAIN_CPU) {
		struct drm_i915_gem_set_domain set_domain;

		DBG(("%s: SYNC: needs_flush? %d, domain? %d, busy? %d\n", __FUNCTION__,
		     bo->needs_flush, bo->domain, __kgem_busy(kgem, bo->handle)));

		VG_CLEAR(set_domain);
		set_domain.handle = bo->handle;
		set_domain.read_domains = I915_GEM_DOMAIN_CPU;
		set_domain.write_domain = I915_GEM_DOMAIN_CPU;

		if (drmIoctl(kgem->fd, DRM_IOCTL_I915_GEM_SET_DOMAIN, &set_domain) == 0) {
			kgem_bo_retire(kgem, bo);
			bo->domain = DOMAIN_CPU;
		}
	}
}

void kgem_clear_dirty(struct kgem *kgem)
{
	struct list * const buffers = &kgem->next_request->buffers;
	struct kgem_bo *bo;

	list_for_each_entry(bo, buffers, request) {
		if (!bo->dirty)
			break;

		bo->dirty = false;
	}
}

uint32_t kgem_bo_get_binding(struct kgem_bo *bo, uint32_t format)
{
	struct kgem_bo_binding *b;

	for (b = &bo->binding; b && b->offset; b = b->next)
		if (format == b->format)
			return b->offset;

	return 0;
}

void kgem_bo_set_binding(struct kgem_bo *bo, uint32_t format, uint16_t offset)
{
	struct kgem_bo_binding *b;

	for (b = &bo->binding; b; b = b->next) {
		if (b->offset)
			continue;

		b->offset = offset;
		b->format = format;

		if (b->next)
			b->next->offset = 0;

		return;
	}

	b = malloc(sizeof(*b));
	if (b) {
		b->next = bo->binding.next;
		b->format = format;
		b->offset = offset;
		bo->binding.next = b;
	}
}