[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,
				 bochs->dev->anon_inode->i_mapping,
				 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)
{
	unsigned i;
	u32 c = 0;
	bo->placement.placement = bo->placements;
	bo->placement.busy_placement = bo->placements;
	if (domain & TTM_PL_FLAG_VRAM) {
		bo->placements[c++].flags = TTM_PL_FLAG_WC
			| TTM_PL_FLAG_UNCACHED
			| TTM_PL_FLAG_VRAM;
	}
	if (domain & TTM_PL_FLAG_SYSTEM) {
		bo->placements[c++].flags = TTM_PL_MASK_CACHING
			| TTM_PL_FLAG_SYSTEM;
	}
	if (!c) {
		bo->placements[c++].flags = TTM_PL_MASK_CACHING
			| TTM_PL_FLAG_SYSTEM;
	}
	for (i = 0; i < c; ++i) {
		bo->placements[i].fpfn = 0;
		bo->placements[i].lpfn = 0;
	}
	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].flags |= 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].flags &= ~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 -EINVAL;

	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->anon_inode->i_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, 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 = PAGE_ALIGN(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);
	*bo = NULL;
}

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

	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;
	struct bochs_bo *bo;

	obj = drm_gem_object_lookup(dev, file, handle);
	if (obj == NULL)
		return -ENOENT;

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

	drm_gem_object_unreference_unlocked(obj);
	return 0;
}

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

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,
44d847b7 DH	228	&bochs_bo_driver,
	229	bochs->dev->anon_inode->i_mapping,
	230	DRM_FILE_PAGE_OFFSET,
0a6659bd GH	231	true);
	232	if (ret) {
	233	DRM_ERROR("Error initialising bo driver; %d\n", ret);
	234	return ret;
	235	}
	236
	237	ret = ttm_bo_init_mm(bdev, TTM_PL_VRAM,
	238	bochs->fb_size >> PAGE_SHIFT);
	239	if (ret) {
	240	DRM_ERROR("Failed ttm VRAM init: %d\n", ret);
	241	return ret;
	242	}
	243
	244	bochs->ttm.initialized = true;
	245	return 0;
	246	}
	247
	248	void bochs_mm_fini(struct bochs_device *bochs)
	249	{
	250	if (!bochs->ttm.initialized)
	251	return;
	252
	253	ttm_bo_device_release(&bochs->ttm.bdev);
	254	bochs_ttm_global_release(bochs);
	255	bochs->ttm.initialized = false;
	256	}
	257
	258	static void bochs_ttm_placement(struct bochs_bo *bo, int domain)
	259	{
f1217ed0	260	unsigned i;
0a6659bd	261	u32 c = 0;
0a6659bd GH	262	bo->placement.placement = bo->placements;
	263	bo->placement.busy_placement = bo->placements;
	264	if (domain & TTM_PL_FLAG_VRAM) {
f1217ed0 CK	265	bo->placements[c++].flags = TTM_PL_FLAG_WC
f1217ed0 CK	266	\| TTM_PL_FLAG_UNCACHED
0a6659bd GH	267	\| TTM_PL_FLAG_VRAM;
	268	}
	269	if (domain & TTM_PL_FLAG_SYSTEM) {
f1217ed0 CK	270	bo->placements[c++].flags = TTM_PL_MASK_CACHING
f1217ed0 CK	271	\| TTM_PL_FLAG_SYSTEM;
0a6659bd GH	272	}
0a6659bd GH	273	if (!c) {
f1217ed0 CK	274	bo->placements[c++].flags = TTM_PL_MASK_CACHING
	275	\| TTM_PL_FLAG_SYSTEM;
	276	}
	277	for (i = 0; i < c; ++i) {
	278	bo->placements[i].fpfn = 0;
	279	bo->placements[i].lpfn = 0;
0a6659bd GH	280	}
	281	bo->placement.num_placement = c;
	282	bo->placement.num_busy_placement = c;
	283	}
	284
	285	static inline u64 bochs_bo_gpu_offset(struct bochs_bo *bo)
	286	{
	287	return bo->bo.offset;
	288	}
	289
	290	int bochs_bo_pin(struct bochs_bo bo, u32 pl_flag, u64 gpu_addr)
	291	{
	292	int i, ret;
	293
	294	if (bo->pin_count) {
	295	bo->pin_count++;
	296	if (gpu_addr)
	297	*gpu_addr = bochs_bo_gpu_offset(bo);
	298	return 0;
	299	}
	300
	301	bochs_ttm_placement(bo, pl_flag);
	302	for (i = 0; i < bo->placement.num_placement; i++)
f1217ed0	303	bo->placements[i].flags \|= TTM_PL_FLAG_NO_EVICT;
0a6659bd GH	304	ret = ttm_bo_validate(&bo->bo, &bo->placement, false, false);
	305	if (ret)
	306	return ret;
	307
	308	bo->pin_count = 1;
	309	if (gpu_addr)
	310	*gpu_addr = bochs_bo_gpu_offset(bo);
	311	return 0;
	312	}
	313
	314	int bochs_bo_unpin(struct bochs_bo *bo)
	315	{
	316	int i, ret;
	317
	318	if (!bo->pin_count) {
	319	DRM_ERROR("unpin bad %p\n", bo);
	320	return 0;
	321	}
	322	bo->pin_count--;
	323
	324	if (bo->pin_count)
	325	return 0;
	326
	327	for (i = 0; i < bo->placement.num_placement; i++)
f1217ed0	328	bo->placements[i].flags &= ~TTM_PL_FLAG_NO_EVICT;
0a6659bd GH	329	ret = ttm_bo_validate(&bo->bo, &bo->placement, false, false);
	330	if (ret)
	331	return ret;
	332
	333	return 0;
	334	}
	335
	336	int bochs_mmap(struct file filp, struct vm_area_struct vma)
	337	{
	338	struct drm_file *file_priv;
	339	struct bochs_device *bochs;
	340
	341	if (unlikely(vma->vm_pgoff < DRM_FILE_PAGE_OFFSET))
884c6dab	342	return -EINVAL;
0a6659bd GH	343
	344	file_priv = filp->private_data;
	345	bochs = file_priv->minor->dev->dev_private;
	346	return ttm_bo_mmap(filp, vma, &bochs->ttm.bdev);
	347	}
	348
	349	/* ---------------------------------------------------------------------- */
	350
	351	static int bochs_bo_create(struct drm_device *dev, int size, int align,
	352	uint32_t flags, struct bochs_bo **pbochsbo)
	353	{
	354	struct bochs_device *bochs = dev->dev_private;
	355	struct bochs_bo *bochsbo;
	356	size_t acc_size;
	357	int ret;
	358
	359	bochsbo = kzalloc(sizeof(struct bochs_bo), GFP_KERNEL);
	360	if (!bochsbo)
	361	return -ENOMEM;
	362
	363	ret = drm_gem_object_init(dev, &bochsbo->gem, size);
	364	if (ret) {
	365	kfree(bochsbo);
	366	return ret;
	367	}
	368
	369	bochsbo->bo.bdev = &bochs->ttm.bdev;
6796cb16	370	bochsbo->bo.bdev->dev_mapping = dev->anon_inode->i_mapping;
0a6659bd GH	371
	372	bochs_ttm_placement(bochsbo, TTM_PL_FLAG_VRAM \| TTM_PL_FLAG_SYSTEM);
	373
	374	acc_size = ttm_bo_dma_acc_size(&bochs->ttm.bdev, size,
	375	sizeof(struct bochs_bo));
	376
	377	ret = ttm_bo_init(&bochs->ttm.bdev, &bochsbo->bo, size,
	378	ttm_bo_type_device, &bochsbo->placement,
	379	align >> PAGE_SHIFT, false, NULL, acc_size,
f4f4e3e3	380	NULL, NULL, bochs_bo_ttm_destroy);
0a6659bd GH	381	if (ret)
	382	return ret;
	383
	384	*pbochsbo = bochsbo;
	385	return 0;
	386	}
	387
	388	int bochs_gem_create(struct drm_device *dev, u32 size, bool iskernel,
	389	struct drm_gem_object **obj)
	390	{
	391	struct bochs_bo *bochsbo;
	392	int ret;
	393
	394	*obj = NULL;
	395
a8ba29cd	396	size = PAGE_ALIGN(size);
0a6659bd GH	397	if (size == 0)
	398	return -EINVAL;
	399
	400	ret = bochs_bo_create(dev, size, 0, 0, &bochsbo);
	401	if (ret) {
	402	if (ret != -ERESTARTSYS)
	403	DRM_ERROR("failed to allocate GEM object\n");
	404	return ret;
	405	}
	406	*obj = &bochsbo->gem;
	407	return 0;
	408	}
	409
	410	int bochs_dumb_create(struct drm_file file, struct drm_device dev,
	411	struct drm_mode_create_dumb *args)
	412	{
	413	struct drm_gem_object *gobj;
	414	u32 handle;
	415	int ret;
	416
	417	args->pitch = args->width * ((args->bpp + 7) / 8);
	418	args->size = args->pitch * args->height;
	419
	420	ret = bochs_gem_create(dev, args->size, false,
	421	&gobj);
	422	if (ret)
	423	return ret;
	424
	425	ret = drm_gem_handle_create(file, gobj, &handle);
	426	drm_gem_object_unreference_unlocked(gobj);
	427	if (ret)
	428	return ret;
	429
	430	args->handle = handle;
	431	return 0;
	432	}
	433
	434	static void bochs_bo_unref(struct bochs_bo **bo)
	435	{
	436	struct ttm_buffer_object *tbo;
	437
	438	if ((*bo) == NULL)
	439	return;
	440
	441	tbo = &((*bo)->bo);
	442	ttm_bo_unref(&tbo);
dcb1ee57	443	*bo = NULL;
0a6659bd GH	444	}
	445
	446	void bochs_gem_free_object(struct drm_gem_object *obj)
	447	{
	448	struct bochs_bo *bochs_bo = gem_to_bochs_bo(obj);
	449
0a6659bd GH	450	bochs_bo_unref(&bochs_bo);
	451	}
	452
	453	int bochs_dumb_mmap_offset(struct drm_file file, struct drm_device dev,
	454	uint32_t handle, uint64_t *offset)
	455	{
	456	struct drm_gem_object *obj;
0a6659bd GH	457	struct bochs_bo *bo;
0a6659bd GH	458
0a6659bd	459	obj = drm_gem_object_lookup(dev, file, handle);
37ae75c8 DV	460	if (obj == NULL)
37ae75c8 DV	461	return -ENOENT;
0a6659bd GH	462
	463	bo = gem_to_bochs_bo(obj);
	464	*offset = bochs_bo_mmap_offset(bo);
	465
37ae75c8 DV	466	drm_gem_object_unreference_unlocked(obj);
37ae75c8 DV	467	return 0;
0a6659bd GH	468	}
	469
	470	/* ---------------------------------------------------------------------- */
	471
	472	static void bochs_user_framebuffer_destroy(struct drm_framebuffer *fb)
	473	{
	474	struct bochs_framebuffer *bochs_fb = to_bochs_framebuffer(fb);
	475	if (bochs_fb->obj)
	476	drm_gem_object_unreference_unlocked(bochs_fb->obj);
	477	drm_framebuffer_cleanup(fb);
	478	kfree(fb);
	479	}
	480
	481	static const struct drm_framebuffer_funcs bochs_fb_funcs = {
	482	.destroy = bochs_user_framebuffer_destroy,
	483	};
	484
	485	int bochs_framebuffer_init(struct drm_device *dev,
	486	struct bochs_framebuffer *gfb,
	487	struct drm_mode_fb_cmd2 *mode_cmd,
	488	struct drm_gem_object *obj)
	489	{
	490	int ret;
	491
	492	drm_helper_mode_fill_fb_struct(&gfb->base, mode_cmd);
	493	gfb->obj = obj;
	494	ret = drm_framebuffer_init(dev, &gfb->base, &bochs_fb_funcs);
	495	if (ret) {
	496	DRM_ERROR("drm_framebuffer_init failed: %d\n", ret);
	497	return ret;
	498	}
	499	return 0;
	500	}
	501
	502	static struct drm_framebuffer *
	503	bochs_user_framebuffer_create(struct drm_device *dev,
	504	struct drm_file *filp,
	505	struct drm_mode_fb_cmd2 *mode_cmd)
	506	{
	507	struct drm_gem_object *obj;
	508	struct bochs_framebuffer *bochs_fb;
	509	int ret;
	510
	511	DRM_DEBUG_DRIVER("%dx%d, format %c%c%c%c\n",
	512	mode_cmd->width, mode_cmd->height,
	513	(mode_cmd->pixel_format) & 0xff,
	514	(mode_cmd->pixel_format >> 8) & 0xff,
	515	(mode_cmd->pixel_format >> 16) & 0xff,
	516	(mode_cmd->pixel_format >> 24) & 0xff);
	517
	518	if (mode_cmd->pixel_format != DRM_FORMAT_XRGB8888)
	519	return ERR_PTR(-ENOENT);
	520
	521	obj = drm_gem_object_lookup(dev, filp, mode_cmd->handles[0]);
	522	if (obj == NULL)
	523	return ERR_PTR(-ENOENT);
	524
	525	bochs_fb = kzalloc(sizeof(*bochs_fb), GFP_KERNEL);
	526	if (!bochs_fb) {
	527	drm_gem_object_unreference_unlocked(obj);
	528	return ERR_PTR(-ENOMEM);
	529	}
	530
	531	ret = bochs_framebuffer_init(dev, bochs_fb, mode_cmd, obj);
532	if (ret) {
533	drm_gem_object_unreference_unlocked(obj);
534	kfree(bochs_fb);
535	return ERR_PTR(ret);
536	}
537	return &bochs_fb->base;
538	}
539
540	const struct drm_mode_config_funcs bochs_mode_funcs = {
541	.fb_create = bochs_user_framebuffer_create,
542	};