[deliverable/linux.git] / drivers / gpu / drm / bochs / bochs_mm.c

/*
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 */

#include "bochs.h"

static void bochs_ttm_placement(struct bochs_bo *bo, int domain);

/* ---------------------------------------------------------------------- */

static inline struct bochs_device *bochs_bdev(struct ttm_bo_device *bd)
{
	return container_of(bd, struct bochs_device, ttm.bdev);
}

static int bochs_ttm_mem_global_init(struct drm_global_reference *ref)
{
	return ttm_mem_global_init(ref->object);
}

static void bochs_ttm_mem_global_release(struct drm_global_reference *ref)
{
	ttm_mem_global_release(ref->object);
}

static int bochs_ttm_global_init(struct bochs_device *bochs)
{
	struct drm_global_reference *global_ref;
	int r;

	global_ref = &bochs->ttm.mem_global_ref;
	global_ref->global_type = DRM_GLOBAL_TTM_MEM;
	global_ref->size = sizeof(struct ttm_mem_global);
	global_ref->init = &bochs_ttm_mem_global_init;
	global_ref->release = &bochs_ttm_mem_global_release;
	r = drm_global_item_ref(global_ref);
	if (r != 0) {
		DRM_ERROR("Failed setting up TTM memory accounting "
			  "subsystem.\n");
		return r;
	}

	bochs->ttm.bo_global_ref.mem_glob =
		bochs->ttm.mem_global_ref.object;
	global_ref = &bochs->ttm.bo_global_ref.ref;
	global_ref->global_type = DRM_GLOBAL_TTM_BO;
	global_ref->size = sizeof(struct ttm_bo_global);
	global_ref->init = &ttm_bo_global_init;
	global_ref->release = &ttm_bo_global_release;
	r = drm_global_item_ref(global_ref);
	if (r != 0) {
		DRM_ERROR("Failed setting up TTM BO subsystem.\n");
		drm_global_item_unref(&bochs->ttm.mem_global_ref);
		return r;
	}

	return 0;
}

static void bochs_ttm_global_release(struct bochs_device *bochs)
{
	if (bochs->ttm.mem_global_ref.release == NULL)
		return;

	drm_global_item_unref(&bochs->ttm.bo_global_ref.ref);
	drm_global_item_unref(&bochs->ttm.mem_global_ref);
	bochs->ttm.mem_global_ref.release = NULL;
}


static void bochs_bo_ttm_destroy(struct ttm_buffer_object *tbo)
{
	struct bochs_bo *bo;

	bo = container_of(tbo, struct bochs_bo, bo);
	drm_gem_object_release(&bo->gem);
	kfree(bo);
}

static bool bochs_ttm_bo_is_bochs_bo(struct ttm_buffer_object *bo)
{
	if (bo->destroy == &bochs_bo_ttm_destroy)
		return true;
	return false;
}

static int bochs_bo_init_mem_type(struct ttm_bo_device *bdev, uint32_t type,
				  struct ttm_mem_type_manager *man)
{
	switch (type) {
	case TTM_PL_SYSTEM:
		man->flags = TTM_MEMTYPE_FLAG_MAPPABLE;
		man->available_caching = TTM_PL_MASK_CACHING;
		man->default_caching = TTM_PL_FLAG_CACHED;
		break;
	case TTM_PL_VRAM:
		man->func = &ttm_bo_manager_func;
		man->flags = TTM_MEMTYPE_FLAG_FIXED |
			TTM_MEMTYPE_FLAG_MAPPABLE;
		man->available_caching = TTM_PL_FLAG_UNCACHED |
			TTM_PL_FLAG_WC;
		man->default_caching = TTM_PL_FLAG_WC;
		break;
	default:
		DRM_ERROR("Unsupported memory type %u\n", (unsigned)type);
		return -EINVAL;
	}
	return 0;
}

static void
bochs_bo_evict_flags(struct ttm_buffer_object *bo, struct ttm_placement *pl)
{
	struct bochs_bo *bochsbo = bochs_bo(bo);

	if (!bochs_ttm_bo_is_bochs_bo(bo))
		return;

	bochs_ttm_placement(bochsbo, TTM_PL_FLAG_SYSTEM);
	*pl = bochsbo->placement;
}

static int bochs_bo_verify_access(struct ttm_buffer_object *bo,
				  struct file *filp)
{
	struct bochs_bo *bochsbo = bochs_bo(bo);

	return drm_vma_node_verify_access(&bochsbo->gem.vma_node, filp);
}

static int bochs_ttm_io_mem_reserve(struct ttm_bo_device *bdev,
				    struct ttm_mem_reg *mem)
{
	struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
	struct bochs_device *bochs = bochs_bdev(bdev);

	mem->bus.addr = NULL;
	mem->bus.offset = 0;
	mem->bus.size = mem->num_pages << PAGE_SHIFT;
	mem->bus.base = 0;
	mem->bus.is_iomem = false;
	if (!(man->flags & TTM_MEMTYPE_FLAG_MAPPABLE))
		return -EINVAL;
	switch (mem->mem_type) {
	case TTM_PL_SYSTEM:
		/* system memory */
		return 0;
	case TTM_PL_VRAM:
		mem->bus.offset = mem->start << PAGE_SHIFT;
		mem->bus.base = bochs->fb_base;
		mem->bus.is_iomem = true;
		break;
	default:
		return -EINVAL;
		break;
	}
	return 0;
}

static void bochs_ttm_io_mem_free(struct ttm_bo_device *bdev,
				  struct ttm_mem_reg *mem)
{
}

static int bochs_bo_move(struct ttm_buffer_object *bo,
			 bool evict, bool interruptible,
			 bool no_wait_gpu,
			 struct ttm_mem_reg *new_mem)
{
	return ttm_bo_move_memcpy(bo, evict, no_wait_gpu, new_mem);
}


static void bochs_ttm_backend_destroy(struct ttm_tt *tt)
{
	ttm_tt_fini(tt);
	kfree(tt);
}

static struct ttm_backend_func bochs_tt_backend_func = {
	.destroy = &bochs_ttm_backend_destroy,
};

static struct ttm_tt *bochs_ttm_tt_create(struct ttm_bo_device *bdev,
					  unsigned long size,
					  uint32_t page_flags,
					  struct page *dummy_read_page)
{
	struct ttm_tt *tt;

	tt = kzalloc(sizeof(struct ttm_tt), GFP_KERNEL);
	if (tt == NULL)
		return NULL;
	tt->func = &bochs_tt_backend_func;
	if (ttm_tt_init(tt, bdev, size, page_flags, dummy_read_page)) {
		kfree(tt);
		return NULL;
	}
	return tt;
}

struct ttm_bo_driver bochs_bo_driver = {
	.ttm_tt_create = bochs_ttm_tt_create,
	.ttm_tt_populate = ttm_pool_populate,
	.ttm_tt_unpopulate = ttm_pool_unpopulate,
	.init_mem_type = bochs_bo_init_mem_type,
	.evict_flags = bochs_bo_evict_flags,
	.move = bochs_bo_move,
	.verify_access = bochs_bo_verify_access,
	.io_mem_reserve = &bochs_ttm_io_mem_reserve,
	.io_mem_free = &bochs_ttm_io_mem_free,
};

int bochs_mm_init(struct bochs_device *bochs)
{
	struct ttm_bo_device *bdev = &bochs->ttm.bdev;
	int ret;

	ret = bochs_ttm_global_init(bochs);
	if (ret)
		return ret;

	ret = ttm_bo_device_init(&bochs->ttm.bdev,
				 bochs->ttm.bo_global_ref.ref.object,
				 &bochs_bo_driver, DRM_FILE_PAGE_OFFSET,
				 true);
	if (ret) {
		DRM_ERROR("Error initialising bo driver; %d\n", ret);
		return ret;
	}

	ret = ttm_bo_init_mm(bdev, TTM_PL_VRAM,
			     bochs->fb_size >> PAGE_SHIFT);
	if (ret) {
		DRM_ERROR("Failed ttm VRAM init: %d\n", ret);
		return ret;
	}

	bochs->ttm.initialized = true;
	return 0;
}

void bochs_mm_fini(struct bochs_device *bochs)
{
	if (!bochs->ttm.initialized)
		return;

	ttm_bo_device_release(&bochs->ttm.bdev);
	bochs_ttm_global_release(bochs);
	bochs->ttm.initialized = false;
}

static void bochs_ttm_placement(struct bochs_bo *bo, int domain)
{
	u32 c = 0;
	bo->placement.fpfn = 0;
	bo->placement.lpfn = 0;
	bo->placement.placement = bo->placements;
	bo->placement.busy_placement = bo->placements;
	if (domain & TTM_PL_FLAG_VRAM) {
		bo->placements[c++] = TTM_PL_FLAG_WC | TTM_PL_FLAG_UNCACHED
			| TTM_PL_FLAG_VRAM;
	}
	if (domain & TTM_PL_FLAG_SYSTEM) {
		bo->placements[c++] = TTM_PL_MASK_CACHING | TTM_PL_FLAG_SYSTEM;
	}
	if (!c) {
		bo->placements[c++] = TTM_PL_MASK_CACHING | TTM_PL_FLAG_SYSTEM;
	}
	bo->placement.num_placement = c;
	bo->placement.num_busy_placement = c;
}

static inline u64 bochs_bo_gpu_offset(struct bochs_bo *bo)
{
	return bo->bo.offset;
}

int bochs_bo_pin(struct bochs_bo *bo, u32 pl_flag, u64 *gpu_addr)
{
	int i, ret;

	if (bo->pin_count) {
		bo->pin_count++;
		if (gpu_addr)
			*gpu_addr = bochs_bo_gpu_offset(bo);
		return 0;
	}

	bochs_ttm_placement(bo, pl_flag);
	for (i = 0; i < bo->placement.num_placement; i++)
		bo->placements[i] |= TTM_PL_FLAG_NO_EVICT;
	ret = ttm_bo_validate(&bo->bo, &bo->placement, false, false);
	if (ret)
		return ret;

	bo->pin_count = 1;
	if (gpu_addr)
		*gpu_addr = bochs_bo_gpu_offset(bo);
	return 0;
}

int bochs_bo_unpin(struct bochs_bo *bo)
{
	int i, ret;

	if (!bo->pin_count) {
		DRM_ERROR("unpin bad %p\n", bo);
		return 0;
	}
	bo->pin_count--;

	if (bo->pin_count)
		return 0;

	for (i = 0; i < bo->placement.num_placement; i++)
		bo->placements[i] &= ~TTM_PL_FLAG_NO_EVICT;
	ret = ttm_bo_validate(&bo->bo, &bo->placement, false, false);
	if (ret)
		return ret;

	return 0;
}

int bochs_mmap(struct file *filp, struct vm_area_struct *vma)
{
	struct drm_file *file_priv;
	struct bochs_device *bochs;

	if (unlikely(vma->vm_pgoff < DRM_FILE_PAGE_OFFSET))
		return drm_mmap(filp, vma);

	file_priv = filp->private_data;
	bochs = file_priv->minor->dev->dev_private;
	return ttm_bo_mmap(filp, vma, &bochs->ttm.bdev);
}

/* ---------------------------------------------------------------------- */

static int bochs_bo_create(struct drm_device *dev, int size, int align,
			   uint32_t flags, struct bochs_bo **pbochsbo)
{
	struct bochs_device *bochs = dev->dev_private;
	struct bochs_bo *bochsbo;
	size_t acc_size;
	int ret;

	bochsbo = kzalloc(sizeof(struct bochs_bo), GFP_KERNEL);
	if (!bochsbo)
		return -ENOMEM;

	ret = drm_gem_object_init(dev, &bochsbo->gem, size);
	if (ret) {
		kfree(bochsbo);
		return ret;
	}

	bochsbo->bo.bdev = &bochs->ttm.bdev;
	bochsbo->bo.bdev->dev_mapping = dev->dev_mapping;

	bochs_ttm_placement(bochsbo, TTM_PL_FLAG_VRAM | TTM_PL_FLAG_SYSTEM);

	acc_size = ttm_bo_dma_acc_size(&bochs->ttm.bdev, size,
				       sizeof(struct bochs_bo));

	ret = ttm_bo_init(&bochs->ttm.bdev, &bochsbo->bo, size,
			  ttm_bo_type_device, &bochsbo->placement,
			  align >> PAGE_SHIFT, false, NULL, acc_size,
			  NULL, bochs_bo_ttm_destroy);
	if (ret)
		return ret;

	*pbochsbo = bochsbo;
	return 0;
}

int bochs_gem_create(struct drm_device *dev, u32 size, bool iskernel,
		     struct drm_gem_object **obj)
{
	struct bochs_bo *bochsbo;
	int ret;

	*obj = NULL;

	size = ALIGN(size, PAGE_SIZE);
	if (size == 0)
		return -EINVAL;

	ret = bochs_bo_create(dev, size, 0, 0, &bochsbo);
	if (ret) {
		if (ret != -ERESTARTSYS)
			DRM_ERROR("failed to allocate GEM object\n");
		return ret;
	}
	*obj = &bochsbo->gem;
	return 0;
}

int bochs_dumb_create(struct drm_file *file, struct drm_device *dev,
		      struct drm_mode_create_dumb *args)
{
	struct drm_gem_object *gobj;
	u32 handle;
	int ret;

	args->pitch = args->width * ((args->bpp + 7) / 8);
	args->size = args->pitch * args->height;

	ret = bochs_gem_create(dev, args->size, false,
			       &gobj);
	if (ret)
		return ret;

	ret = drm_gem_handle_create(file, gobj, &handle);
	drm_gem_object_unreference_unlocked(gobj);
	if (ret)
		return ret;

	args->handle = handle;
	return 0;
}

static void bochs_bo_unref(struct bochs_bo **bo)
{
	struct ttm_buffer_object *tbo;

	if ((*bo) == NULL)
		return;

	tbo = &((*bo)->bo);
	ttm_bo_unref(&tbo);
	if (tbo == NULL)
		*bo = NULL;

}

void bochs_gem_free_object(struct drm_gem_object *obj)
{
	struct bochs_bo *bochs_bo = gem_to_bochs_bo(obj);

	if (!bochs_bo)
		return;
	bochs_bo_unref(&bochs_bo);
}

int bochs_dumb_mmap_offset(struct drm_file *file, struct drm_device *dev,
			   uint32_t handle, uint64_t *offset)
{
	struct drm_gem_object *obj;
	int ret;
	struct bochs_bo *bo;

	mutex_lock(&dev->struct_mutex);
	obj = drm_gem_object_lookup(dev, file, handle);
	if (obj == NULL) {
		ret = -ENOENT;
		goto out_unlock;
	}

	bo = gem_to_bochs_bo(obj);
	*offset = bochs_bo_mmap_offset(bo);

	drm_gem_object_unreference(obj);
	ret = 0;
out_unlock:
	mutex_unlock(&dev->struct_mutex);
	return ret;

}

/* ---------------------------------------------------------------------- */

static void bochs_user_framebuffer_destroy(struct drm_framebuffer *fb)
{
	struct bochs_framebuffer *bochs_fb = to_bochs_framebuffer(fb);
	if (bochs_fb->obj)
		drm_gem_object_unreference_unlocked(bochs_fb->obj);
	drm_framebuffer_cleanup(fb);
	kfree(fb);
}

static const struct drm_framebuffer_funcs bochs_fb_funcs = {
	.destroy = bochs_user_framebuffer_destroy,
};

int bochs_framebuffer_init(struct drm_device *dev,
			   struct bochs_framebuffer *gfb,
			   struct drm_mode_fb_cmd2 *mode_cmd,
			   struct drm_gem_object *obj)
{
	int ret;

	drm_helper_mode_fill_fb_struct(&gfb->base, mode_cmd);
	gfb->obj = obj;
	ret = drm_framebuffer_init(dev, &gfb->base, &bochs_fb_funcs);
	if (ret) {
		DRM_ERROR("drm_framebuffer_init failed: %d\n", ret);
		return ret;
	}
	return 0;
}

static struct drm_framebuffer *
bochs_user_framebuffer_create(struct drm_device *dev,
			      struct drm_file *filp,
			      struct drm_mode_fb_cmd2 *mode_cmd)
{
	struct drm_gem_object *obj;
	struct bochs_framebuffer *bochs_fb;
	int ret;

	DRM_DEBUG_DRIVER("%dx%d, format %c%c%c%c\n",
	       mode_cmd->width, mode_cmd->height,
	       (mode_cmd->pixel_format)       & 0xff,
	       (mode_cmd->pixel_format >> 8)  & 0xff,
	       (mode_cmd->pixel_format >> 16) & 0xff,
	       (mode_cmd->pixel_format >> 24) & 0xff);

	if (mode_cmd->pixel_format != DRM_FORMAT_XRGB8888)
		return ERR_PTR(-ENOENT);

	obj = drm_gem_object_lookup(dev, filp, mode_cmd->handles[0]);
	if (obj == NULL)
		return ERR_PTR(-ENOENT);

	bochs_fb = kzalloc(sizeof(*bochs_fb), GFP_KERNEL);
	if (!bochs_fb) {
		drm_gem_object_unreference_unlocked(obj);
		return ERR_PTR(-ENOMEM);
	}

	ret = bochs_framebuffer_init(dev, bochs_fb, mode_cmd, obj);
	if (ret) {
		drm_gem_object_unreference_unlocked(obj);
		kfree(bochs_fb);
		return ERR_PTR(ret);
	}
	return &bochs_fb->base;
}

const struct drm_mode_config_funcs bochs_mode_funcs = {
	.fb_create = bochs_user_framebuffer_create,
};
Commit	Line	Data
0a6659bd GH	1	/*
	2	* This program is free software; you can redistribute it and/or modify
	3	* it under the terms of the GNU General Public License as published by
	4	* the Free Software Foundation; either version 2 of the License, or
	5	* (at your option) any later version.
	6	*/
	7
	8	#include "bochs.h"
	9
	10	static void bochs_ttm_placement(struct bochs_bo *bo, int domain);
	11
	12	/* ---------------------------------------------------------------------- */
	13
	14	static inline struct bochs_device bochs_bdev(struct ttm_bo_device bd)
	15	{
	16	return container_of(bd, struct bochs_device, ttm.bdev);
	17	}
	18
	19	static int bochs_ttm_mem_global_init(struct drm_global_reference *ref)
	20	{
	21	return ttm_mem_global_init(ref->object);
	22	}
	23
	24	static void bochs_ttm_mem_global_release(struct drm_global_reference *ref)
	25	{
	26	ttm_mem_global_release(ref->object);
	27	}
	28
	29	static int bochs_ttm_global_init(struct bochs_device *bochs)
	30	{
	31	struct drm_global_reference *global_ref;
	32	int r;
	33
	34	global_ref = &bochs->ttm.mem_global_ref;
	35	global_ref->global_type = DRM_GLOBAL_TTM_MEM;
	36	global_ref->size = sizeof(struct ttm_mem_global);
	37	global_ref->init = &bochs_ttm_mem_global_init;
	38	global_ref->release = &bochs_ttm_mem_global_release;
	39	r = drm_global_item_ref(global_ref);
	40	if (r != 0) {
	41	DRM_ERROR("Failed setting up TTM memory accounting "
	42	"subsystem.\n");
	43	return r;
	44	}
	45
	46	bochs->ttm.bo_global_ref.mem_glob =
	47	bochs->ttm.mem_global_ref.object;
	48	global_ref = &bochs->ttm.bo_global_ref.ref;
	49	global_ref->global_type = DRM_GLOBAL_TTM_BO;
	50	global_ref->size = sizeof(struct ttm_bo_global);
	51	global_ref->init = &ttm_bo_global_init;
	52	global_ref->release = &ttm_bo_global_release;
	53	r = drm_global_item_ref(global_ref);
	54	if (r != 0) {
	55	DRM_ERROR("Failed setting up TTM BO subsystem.\n");
	56	drm_global_item_unref(&bochs->ttm.mem_global_ref);
	57	return r;
	58	}
	59
	60	return 0;
	61	}
	62
	63	static void bochs_ttm_global_release(struct bochs_device *bochs)
	64	{
65	if (bochs->ttm.mem_global_ref.release == NULL)
66	return;
67
68	drm_global_item_unref(&bochs->ttm.bo_global_ref.ref);
69	drm_global_item_unref(&bochs->ttm.mem_global_ref);
70	bochs->ttm.mem_global_ref.release = NULL;
71	}
72
73
74	static void bochs_bo_ttm_destroy(struct ttm_buffer_object *tbo)
75	{
76	struct bochs_bo *bo;
77
78	bo = container_of(tbo, struct bochs_bo, bo);
79	drm_gem_object_release(&bo->gem);
80	kfree(bo);
81	}
82
83	static bool bochs_ttm_bo_is_bochs_bo(struct ttm_buffer_object *bo)
84	{
85	if (bo->destroy == &bochs_bo_ttm_destroy)
86	return true;
87	return false;
88	}
89
90	static int bochs_bo_init_mem_type(struct ttm_bo_device *bdev, uint32_t type,
91	struct ttm_mem_type_manager *man)
92	{
93	switch (type) {
94	case TTM_PL_SYSTEM:
95	man->flags = TTM_MEMTYPE_FLAG_MAPPABLE;
96	man->available_caching = TTM_PL_MASK_CACHING;
97	man->default_caching = TTM_PL_FLAG_CACHED;
98	break;
99	case TTM_PL_VRAM:
100	man->func = &ttm_bo_manager_func;
101	man->flags = TTM_MEMTYPE_FLAG_FIXED \|
102	TTM_MEMTYPE_FLAG_MAPPABLE;
103	man->available_caching = TTM_PL_FLAG_UNCACHED \|
104	TTM_PL_FLAG_WC;
105	man->default_caching = TTM_PL_FLAG_WC;
106	break;
107	default:
108	DRM_ERROR("Unsupported memory type %u\n", (unsigned)type);
109	return -EINVAL;
110	}
111	return 0;
112	}
113
114	static void
115	bochs_bo_evict_flags(struct ttm_buffer_object bo, struct ttm_placement pl)
116	{
117	struct bochs_bo *bochsbo = bochs_bo(bo);
118
119	if (!bochs_ttm_bo_is_bochs_bo(bo))
120	return;
121
122	bochs_ttm_placement(bochsbo, TTM_PL_FLAG_SYSTEM);
123	*pl = bochsbo->placement;
124	}
125
126	static int bochs_bo_verify_access(struct ttm_buffer_object *bo,
127	struct file *filp)
128	{
129	struct bochs_bo *bochsbo = bochs_bo(bo);
130
131	return drm_vma_node_verify_access(&bochsbo->gem.vma_node, filp);
132	}
133
134	static int bochs_ttm_io_mem_reserve(struct ttm_bo_device *bdev,
135	struct ttm_mem_reg *mem)
136	{
137	struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
138	struct bochs_device *bochs = bochs_bdev(bdev);
139
140	mem->bus.addr = NULL;
141	mem->bus.offset = 0;
142	mem->bus.size = mem->num_pages << PAGE_SHIFT;
143	mem->bus.base = 0;
144	mem->bus.is_iomem = false;
145	if (!(man->flags & TTM_MEMTYPE_FLAG_MAPPABLE))
146	return -EINVAL;
147	switch (mem->mem_type) {
148	case TTM_PL_SYSTEM:
149	/* system memory */
150	return 0;
151	case TTM_PL_VRAM:
152	mem->bus.offset = mem->start << PAGE_SHIFT;
153	mem->bus.base = bochs->fb_base;
154	mem->bus.is_iomem = true;
155	break;
156	default:
157	return -EINVAL;
158	break;
159	}
160	return 0;
161	}
162
163	static void bochs_ttm_io_mem_free(struct ttm_bo_device *bdev,
164	struct ttm_mem_reg *mem)
165	{
166	}
167
168	static int bochs_bo_move(struct ttm_buffer_object *bo,
169	bool evict, bool interruptible,
170	bool no_wait_gpu,
171	struct ttm_mem_reg *new_mem)
172	{
173	return ttm_bo_move_memcpy(bo, evict, no_wait_gpu, new_mem);
174	}
175
176
177	static void bochs_ttm_backend_destroy(struct ttm_tt *tt)
178	{
179	ttm_tt_fini(tt);
180	kfree(tt);
181	}
182
183	static struct ttm_backend_func bochs_tt_backend_func = {
184	.destroy = &bochs_ttm_backend_destroy,
185	};
186
187	static struct ttm_tt bochs_ttm_tt_create(struct ttm_bo_device bdev,
188	unsigned long size,
189	uint32_t page_flags,
190	struct page *dummy_read_page)
191	{
192	struct ttm_tt *tt;
193
194	tt = kzalloc(sizeof(struct ttm_tt), GFP_KERNEL);
195	if (tt == NULL)
196	return NULL;
197	tt->func = &bochs_tt_backend_func;
198	if (ttm_tt_init(tt, bdev, size, page_flags, dummy_read_page)) {
199	kfree(tt);
200	return NULL;
201	}
202	return tt;
203	}
204
205	struct ttm_bo_driver bochs_bo_driver = {
206	.ttm_tt_create = bochs_ttm_tt_create,
207	.ttm_tt_populate = ttm_pool_populate,
208	.ttm_tt_unpopulate = ttm_pool_unpopulate,
209	.init_mem_type = bochs_bo_init_mem_type,
210	.evict_flags = bochs_bo_evict_flags,
211	.move = bochs_bo_move,
212	.verify_access = bochs_bo_verify_access,
213	.io_mem_reserve = &bochs_ttm_io_mem_reserve,
214	.io_mem_free = &bochs_ttm_io_mem_free,
215	};
216
217	int bochs_mm_init(struct bochs_device *bochs)
218	{
219	struct ttm_bo_device *bdev = &bochs->ttm.bdev;
220	int ret;
221
222	ret = bochs_ttm_global_init(bochs);
223	if (ret)
224	return ret;
225
226	ret = ttm_bo_device_init(&bochs->ttm.bdev,
227	bochs->ttm.bo_global_ref.ref.object,
228	&bochs_bo_driver, DRM_FILE_PAGE_OFFSET,
229	true);
230	if (ret) {
231	DRM_ERROR("Error initialising bo driver; %d\n", ret);
232	return ret;
233	}
234
235	ret = ttm_bo_init_mm(bdev, TTM_PL_VRAM,
236	bochs->fb_size >> PAGE_SHIFT);
237	if (ret) {
238	DRM_ERROR("Failed ttm VRAM init: %d\n", ret);
239	return ret;
240	}
241
242	bochs->ttm.initialized = true;
243	return 0;
244	}
245
246	void bochs_mm_fini(struct bochs_device *bochs)
247	{
248	if (!bochs->ttm.initialized)
249	return;
250
251	ttm_bo_device_release(&bochs->ttm.bdev);
252	bochs_ttm_global_release(bochs);
253	bochs->ttm.initialized = false;
254	}
255
256	static void bochs_ttm_placement(struct bochs_bo *bo, int domain)
257	{
258	u32 c = 0;
259	bo->placement.fpfn = 0;
260	bo->placement.lpfn = 0;
261	bo->placement.placement = bo->placements;
262	bo->placement.busy_placement = bo->placements;
263	if (domain & TTM_PL_FLAG_VRAM) {
264	bo->placements[c++] = TTM_PL_FLAG_WC \| TTM_PL_FLAG_UNCACHED
265	\| TTM_PL_FLAG_VRAM;
266	}
267	if (domain & TTM_PL_FLAG_SYSTEM) {
268	bo->placements[c++] = TTM_PL_MASK_CACHING \| TTM_PL_FLAG_SYSTEM;
269	}
270	if (!c) {
271	bo->placements[c++] = TTM_PL_MASK_CACHING \| TTM_PL_FLAG_SYSTEM;
272	}
273	bo->placement.num_placement = c;
274	bo->placement.num_busy_placement = c;
275	}
276
277	static inline u64 bochs_bo_gpu_offset(struct bochs_bo *bo)
278	{
279	return bo->bo.offset;
280	}
281
282	int bochs_bo_pin(struct bochs_bo bo, u32 pl_flag, u64 gpu_addr)
283	{
284	int i, ret;
285
286	if (bo->pin_count) {
287	bo->pin_count++;
288	if (gpu_addr)
289	*gpu_addr = bochs_bo_gpu_offset(bo);
290	return 0;
291	}
292
293	bochs_ttm_placement(bo, pl_flag);
294	for (i = 0; i < bo->placement.num_placement; i++)
295	bo->placements[i] \|= TTM_PL_FLAG_NO_EVICT;
296	ret = ttm_bo_validate(&bo->bo, &bo->placement, false, false);
297	if (ret)
298	return ret;
299
300	bo->pin_count = 1;
301	if (gpu_addr)
302	*gpu_addr = bochs_bo_gpu_offset(bo);
303	return 0;
304	}
305
306	int bochs_bo_unpin(struct bochs_bo *bo)
307	{
308	int i, ret;
309
310	if (!bo->pin_count) {
311	DRM_ERROR("unpin bad %p\n", bo);
312	return 0;
313	}
314	bo->pin_count--;
315
316	if (bo->pin_count)
317	return 0;
318
319	for (i = 0; i < bo->placement.num_placement; i++)
320	bo->placements[i] &= ~TTM_PL_FLAG_NO_EVICT;
321	ret = ttm_bo_validate(&bo->bo, &bo->placement, false, false);
322	if (ret)
323	return ret;
324
325	return 0;
326	}
327
328	int bochs_mmap(struct file filp, struct vm_area_struct vma)
329	{
330	struct drm_file *file_priv;
331	struct bochs_device *bochs;
332
333	if (unlikely(vma->vm_pgoff < DRM_FILE_PAGE_OFFSET))
334	return drm_mmap(filp, vma);
335
336	file_priv = filp->private_data;
337	bochs = file_priv->minor->dev->dev_private;
338	return ttm_bo_mmap(filp, vma, &bochs->ttm.bdev);
339	}
340
341	/* ---------------------------------------------------------------------- */
342
343	static int bochs_bo_create(struct drm_device *dev, int size, int align,
344	uint32_t flags, struct bochs_bo **pbochsbo)
345	{
346	struct bochs_device *bochs = dev->dev_private;
347	struct bochs_bo *bochsbo;
348	size_t acc_size;
349	int ret;
350
351	bochsbo = kzalloc(sizeof(struct bochs_bo), GFP_KERNEL);
352	if (!bochsbo)
353	return -ENOMEM;
354
355	ret = drm_gem_object_init(dev, &bochsbo->gem, size);
356	if (ret) {
357	kfree(bochsbo);
358	return ret;
359	}
360
361	bochsbo->bo.bdev = &bochs->ttm.bdev;
362	bochsbo->bo.bdev->dev_mapping = dev->dev_mapping;
363
364	bochs_ttm_placement(bochsbo, TTM_PL_FLAG_VRAM \| TTM_PL_FLAG_SYSTEM);
365
366	acc_size = ttm_bo_dma_acc_size(&bochs->ttm.bdev, size,
367	sizeof(struct bochs_bo));
368
369	ret = ttm_bo_init(&bochs->ttm.bdev, &bochsbo->bo, size,
370	ttm_bo_type_device, &bochsbo->placement,
371	align >> PAGE_SHIFT, false, NULL, acc_size,
372	NULL, bochs_bo_ttm_destroy);
373	if (ret)
374	return ret;
375
376	*pbochsbo = bochsbo;
377	return 0;
378	}
379
380	int bochs_gem_create(struct drm_device *dev, u32 size, bool iskernel,
381	struct drm_gem_object **obj)
382	{
383	struct bochs_bo *bochsbo;
384	int ret;
385
386	*obj = NULL;
387
388	size = ALIGN(size, PAGE_SIZE);
389	if (size == 0)
390	return -EINVAL;
391
392	ret = bochs_bo_create(dev, size, 0, 0, &bochsbo);
393	if (ret) {
394	if (ret != -ERESTARTSYS)
395	DRM_ERROR("failed to allocate GEM object\n");
396	return ret;
397	}
398	*obj = &bochsbo->gem;
399	return 0;
400	}
401
402	int bochs_dumb_create(struct drm_file file, struct drm_device dev,
403	struct drm_mode_create_dumb *args)
404	{
405	struct drm_gem_object *gobj;
406	u32 handle;
407	int ret;
408
409	args->pitch = args->width * ((args->bpp + 7) / 8);
410	args->size = args->pitch * args->height;
411
412	ret = bochs_gem_create(dev, args->size, false,
413	&gobj);
414	if (ret)
415	return ret;
416
417	ret = drm_gem_handle_create(file, gobj, &handle);
418	drm_gem_object_unreference_unlocked(gobj);
419	if (ret)
420	return ret;
421
422	args->handle = handle;
423	return 0;
424	}
425
426	static void bochs_bo_unref(struct bochs_bo **bo)
427	{
428	struct ttm_buffer_object *tbo;
429
430	if ((*bo) == NULL)
431	return;
432
433	tbo = &((*bo)->bo);
434	ttm_bo_unref(&tbo);
435	if (tbo == NULL)
436	*bo = NULL;
437
438	}
439
440	void bochs_gem_free_object(struct drm_gem_object *obj)
441	{
442	struct bochs_bo *bochs_bo = gem_to_bochs_bo(obj);
443
444	if (!bochs_bo)
445	return;
446	bochs_bo_unref(&bochs_bo);
447	}
448
449	int bochs_dumb_mmap_offset(struct drm_file file, struct drm_device dev,
450	uint32_t handle, uint64_t *offset)
451	{
452	struct drm_gem_object *obj;
453	int ret;
454	struct bochs_bo *bo;
455
456	mutex_lock(&dev->struct_mutex);
457	obj = drm_gem_object_lookup(dev, file, handle);
458	if (obj == NULL) {
459	ret = -ENOENT;
460	goto out_unlock;
461	}
462
463	bo = gem_to_bochs_bo(obj);
464	*offset = bochs_bo_mmap_offset(bo);
465
466	drm_gem_object_unreference(obj);
467	ret = 0;
468	out_unlock:
469	mutex_unlock(&dev->struct_mutex);
470	return ret;
471
472	}
473
474	/* ---------------------------------------------------------------------- */
475
476	static void bochs_user_framebuffer_destroy(struct drm_framebuffer *fb)
477	{
478	struct bochs_framebuffer *bochs_fb = to_bochs_framebuffer(fb);
479	if (bochs_fb->obj)
480	drm_gem_object_unreference_unlocked(bochs_fb->obj);
481	drm_framebuffer_cleanup(fb);
482	kfree(fb);
483	}
484
485	static const struct drm_framebuffer_funcs bochs_fb_funcs = {
486	.destroy = bochs_user_framebuffer_destroy,
487	};
488
489	int bochs_framebuffer_init(struct drm_device *dev,
490	struct bochs_framebuffer *gfb,
491	struct drm_mode_fb_cmd2 *mode_cmd,
492	struct drm_gem_object *obj)
493	{
494	int ret;
495
496	drm_helper_mode_fill_fb_struct(&gfb->base, mode_cmd);
497	gfb->obj = obj;
498	ret = drm_framebuffer_init(dev, &gfb->base, &bochs_fb_funcs);
499	if (ret) {
500	DRM_ERROR("drm_framebuffer_init failed: %d\n", ret);
501	return ret;
502	}
503	return 0;
504	}
505
506	static struct drm_framebuffer *
507	bochs_user_framebuffer_create(struct drm_device *dev,
508	struct drm_file *filp,
509	struct drm_mode_fb_cmd2 *mode_cmd)
510	{
511	struct drm_gem_object *obj;
512	struct bochs_framebuffer *bochs_fb;
513	int ret;
514
515	DRM_DEBUG_DRIVER("%dx%d, format %c%c%c%c\n",
516	mode_cmd->width, mode_cmd->height,
517	(mode_cmd->pixel_format) & 0xff,
518	(mode_cmd->pixel_format >> 8) & 0xff,
519	(mode_cmd->pixel_format >> 16) & 0xff,
520	(mode_cmd->pixel_format >> 24) & 0xff);
521
522	if (mode_cmd->pixel_format != DRM_FORMAT_XRGB8888)
523	return ERR_PTR(-ENOENT);
524
525	obj = drm_gem_object_lookup(dev, filp, mode_cmd->handles[0]);
526	if (obj == NULL)
527	return ERR_PTR(-ENOENT);
528
529	bochs_fb = kzalloc(sizeof(*bochs_fb), GFP_KERNEL);
530	if (!bochs_fb) {
531	drm_gem_object_unreference_unlocked(obj);
532	return ERR_PTR(-ENOMEM);
533	}
534
535	ret = bochs_framebuffer_init(dev, bochs_fb, mode_cmd, obj);
536	if (ret) {
537	drm_gem_object_unreference_unlocked(obj);
538	kfree(bochs_fb);
539	return ERR_PTR(ret);
540	}
541	return &bochs_fb->base;
542	}
543
544	const struct drm_mode_config_funcs bochs_mode_funcs = {
545	.fb_create = bochs_user_framebuffer_create,
546	};