[deliverable/linux.git] / drivers / gpu / drm / cirrus / cirrus_main.c

/*
 * Copyright 2012 Red Hat
 *
 * This file is subject to the terms and conditions of the GNU General
 * Public License version 2. See the file COPYING in the main
 * directory of this archive for more details.
 *
 * Authors: Matthew Garrett
 *          Dave Airlie
 */
#include <drm/drmP.h>
#include <drm/drm_crtc_helper.h>

#include "cirrus_drv.h"


static void cirrus_user_framebuffer_destroy(struct drm_framebuffer *fb)
{
	struct cirrus_framebuffer *cirrus_fb = to_cirrus_framebuffer(fb);

	drm_gem_object_unreference_unlocked(cirrus_fb->obj);
	drm_framebuffer_cleanup(fb);
	kfree(fb);
}

static const struct drm_framebuffer_funcs cirrus_fb_funcs = {
	.destroy = cirrus_user_framebuffer_destroy,
};

int cirrus_framebuffer_init(struct drm_device *dev,
			    struct cirrus_framebuffer *gfb,
			    const 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, &cirrus_fb_funcs);
	if (ret) {
		DRM_ERROR("drm_framebuffer_init failed: %d\n", ret);
		return ret;
	}
	return 0;
}

static struct drm_framebuffer *
cirrus_user_framebuffer_create(struct drm_device *dev,
			       struct drm_file *filp,
			       const struct drm_mode_fb_cmd2 *mode_cmd)
{
	struct cirrus_device *cdev = dev->dev_private;
	struct drm_gem_object *obj;
	struct cirrus_framebuffer *cirrus_fb;
	int ret;
	u32 bpp, depth;

	drm_fb_get_bpp_depth(mode_cmd->pixel_format, &depth, &bpp);

	if (!cirrus_check_framebuffer(cdev, mode_cmd->width, mode_cmd->height,
				      bpp, mode_cmd->pitches[0]))
		return ERR_PTR(-EINVAL);

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

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

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

static const struct drm_mode_config_funcs cirrus_mode_funcs = {
	.fb_create = cirrus_user_framebuffer_create,
};

/* Unmap the framebuffer from the core and release the memory */
static void cirrus_vram_fini(struct cirrus_device *cdev)
{
	iounmap(cdev->rmmio);
	cdev->rmmio = NULL;
	if (cdev->mc.vram_base)
		release_mem_region(cdev->mc.vram_base, cdev->mc.vram_size);
}

/* Map the framebuffer from the card and configure the core */
static int cirrus_vram_init(struct cirrus_device *cdev)
{
	/* BAR 0 is VRAM */
	cdev->mc.vram_base = pci_resource_start(cdev->dev->pdev, 0);
	cdev->mc.vram_size = pci_resource_len(cdev->dev->pdev, 0);

	if (!request_mem_region(cdev->mc.vram_base, cdev->mc.vram_size,
				"cirrusdrmfb_vram")) {
		DRM_ERROR("can't reserve VRAM\n");
		return -ENXIO;
	}

	return 0;
}

/*
 * Our emulated hardware has two sets of memory. One is video RAM and can
 * simply be used as a linear framebuffer - the other provides mmio access
 * to the display registers. The latter can also be accessed via IO port
 * access, but we map the range and use mmio to program them instead
 */

int cirrus_device_init(struct cirrus_device *cdev,
		       struct drm_device *ddev,
		       struct pci_dev *pdev, uint32_t flags)
{
	int ret;

	cdev->dev = ddev;
	cdev->flags = flags;

	/* Hardcode the number of CRTCs to 1 */
	cdev->num_crtc = 1;

	/* BAR 0 is the framebuffer, BAR 1 contains registers */
	cdev->rmmio_base = pci_resource_start(cdev->dev->pdev, 1);
	cdev->rmmio_size = pci_resource_len(cdev->dev->pdev, 1);

	if (!request_mem_region(cdev->rmmio_base, cdev->rmmio_size,
				"cirrusdrmfb_mmio")) {
		DRM_ERROR("can't reserve mmio registers\n");
		return -ENOMEM;
	}

	cdev->rmmio = ioremap(cdev->rmmio_base, cdev->rmmio_size);

	if (cdev->rmmio == NULL)
		return -ENOMEM;

	ret = cirrus_vram_init(cdev);
	if (ret) {
		release_mem_region(cdev->rmmio_base, cdev->rmmio_size);
		return ret;
	}

	return 0;
}

void cirrus_device_fini(struct cirrus_device *cdev)
{
	release_mem_region(cdev->rmmio_base, cdev->rmmio_size);
	cirrus_vram_fini(cdev);
}

/*
 * Functions here will be called by the core once it's bound the driver to
 * a PCI device
 */

int cirrus_driver_load(struct drm_device *dev, unsigned long flags)
{
	struct cirrus_device *cdev;
	int r;

	cdev = kzalloc(sizeof(struct cirrus_device), GFP_KERNEL);
	if (cdev == NULL)
		return -ENOMEM;
	dev->dev_private = (void *)cdev;

	r = cirrus_device_init(cdev, dev, dev->pdev, flags);
	if (r) {
		dev_err(&dev->pdev->dev, "Fatal error during GPU init: %d\n", r);
		goto out;
	}

	r = cirrus_mm_init(cdev);
	if (r) {
		dev_err(&dev->pdev->dev, "fatal err on mm init\n");
		goto out;
	}

	/*
	 * cirrus_modeset_init() is initializing/registering the emulated fbdev
	 * and DRM internals can access/test some of the fields in
	 * mode_config->funcs as part of the fbdev registration process.
	 * Make sure dev->mode_config.funcs is properly set to avoid
	 * dereferencing a NULL pointer.
	 * FIXME: mode_config.funcs assignment should probably be done in
	 * cirrus_modeset_init() (that's a common pattern seen in other DRM
	 * drivers).
	 */
	dev->mode_config.funcs = &cirrus_mode_funcs;
	r = cirrus_modeset_init(cdev);
	if (r) {
		dev_err(&dev->pdev->dev, "Fatal error during modeset init: %d\n", r);
		goto out;
	}

	return 0;
out:
	cirrus_driver_unload(dev);
	return r;
}

int cirrus_driver_unload(struct drm_device *dev)
{
	struct cirrus_device *cdev = dev->dev_private;

	if (cdev == NULL)
		return 0;
	cirrus_modeset_fini(cdev);
	cirrus_mm_fini(cdev);
	cirrus_device_fini(cdev);
	kfree(cdev);
	dev->dev_private = NULL;
	return 0;
}

int cirrus_gem_create(struct drm_device *dev,
		   u32 size, bool iskernel,
		   struct drm_gem_object **obj)
{
	struct cirrus_bo *cirrusbo;
	int ret;

	*obj = NULL;

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

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

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

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

	ret = cirrus_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 cirrus_bo_unref(struct cirrus_bo **bo)
{
	struct ttm_buffer_object *tbo;

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

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

void cirrus_gem_free_object(struct drm_gem_object *obj)
{
	struct cirrus_bo *cirrus_bo = gem_to_cirrus_bo(obj);

	cirrus_bo_unref(&cirrus_bo);
}


static inline u64 cirrus_bo_mmap_offset(struct cirrus_bo *bo)
{
	return drm_vma_node_offset_addr(&bo->bo.vma_node);
}

int
cirrus_dumb_mmap_offset(struct drm_file *file,
		     struct drm_device *dev,
		     uint32_t handle,
		     uint64_t *offset)
{
	struct drm_gem_object *obj;
	struct cirrus_bo *bo;

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

	bo = gem_to_cirrus_bo(obj);
	*offset = cirrus_bo_mmap_offset(bo);

	drm_gem_object_unreference_unlocked(obj);

	return 0;
}

bool cirrus_check_framebuffer(struct cirrus_device *cdev, int width, int height,
			      int bpp, int pitch)
{
	const int max_pitch = 0x1FF << 3; /* (4096 - 1) & ~111b bytes */
	const int max_size = cdev->mc.vram_size;

	if (bpp > cirrus_bpp)
		return false;
	if (bpp > 32)
		return false;

	if (pitch > max_pitch)
		return false;

	if (pitch * height > max_size)
		return false;

	return true;
}
Commit	Line	Data
f9aa76a8 DA	1	/*
	2	* Copyright 2012 Red Hat
	3	*
	4	* This file is subject to the terms and conditions of the GNU General
	5	* Public License version 2. See the file COPYING in the main
	6	* directory of this archive for more details.
	7	*
	8	* Authors: Matthew Garrett
	9	* Dave Airlie
	10	*/
760285e7 DH	11	#include <drm/drmP.h>
760285e7 DH	12	#include <drm/drm_crtc_helper.h>
f9aa76a8 DA	13
	14	#include "cirrus_drv.h"
	15
	16
	17	static void cirrus_user_framebuffer_destroy(struct drm_framebuffer *fb)
	18	{
	19	struct cirrus_framebuffer *cirrus_fb = to_cirrus_framebuffer(fb);
63ecf572 ME	20
63ecf572 ME	21	drm_gem_object_unreference_unlocked(cirrus_fb->obj);
f9aa76a8 DA	22	drm_framebuffer_cleanup(fb);
	23	kfree(fb);
	24	}
	25
f9aa76a8 DA	26	static const struct drm_framebuffer_funcs cirrus_fb_funcs = {
f9aa76a8 DA	27	.destroy = cirrus_user_framebuffer_destroy,
f9aa76a8 DA	28	};
	29
	30	int cirrus_framebuffer_init(struct drm_device *dev,
	31	struct cirrus_framebuffer *gfb,
1eb83451	32	const struct drm_mode_fb_cmd2 *mode_cmd,
f9aa76a8 DA	33	struct drm_gem_object *obj)
	34	{
	35	int ret;
	36
c7d73f6a DV	37	drm_helper_mode_fill_fb_struct(&gfb->base, mode_cmd);
c7d73f6a DV	38	gfb->obj = obj;
f9aa76a8 DA	39	ret = drm_framebuffer_init(dev, &gfb->base, &cirrus_fb_funcs);
	40	if (ret) {
	41	DRM_ERROR("drm_framebuffer_init failed: %d\n", ret);
	42	return ret;
	43	}
f9aa76a8 DA	44	return 0;
	45	}
	46
	47	static struct drm_framebuffer *
	48	cirrus_user_framebuffer_create(struct drm_device *dev,
	49	struct drm_file *filp,
1eb83451	50	const struct drm_mode_fb_cmd2 *mode_cmd)
f9aa76a8	51	{
8975626e	52	struct cirrus_device *cdev = dev->dev_private;
f9aa76a8 DA	53	struct drm_gem_object *obj;
	54	struct cirrus_framebuffer *cirrus_fb;
	55	int ret;
	56	u32 bpp, depth;
	57
	58	drm_fb_get_bpp_depth(mode_cmd->pixel_format, &depth, &bpp);
8975626e ZR	59
	60	if (!cirrus_check_framebuffer(cdev, mode_cmd->width, mode_cmd->height,
	61	bpp, mode_cmd->pitches[0]))
f9aa76a8 DA	62	return ERR_PTR(-EINVAL);
f9aa76a8 DA	63
a8ad0bd8	64	obj = drm_gem_object_lookup(filp, mode_cmd->handles[0]);
f9aa76a8 DA	65	if (obj == NULL)
	66	return ERR_PTR(-ENOENT);
	67
	68	cirrus_fb = kzalloc(sizeof(*cirrus_fb), GFP_KERNEL);
	69	if (!cirrus_fb) {
	70	drm_gem_object_unreference_unlocked(obj);
	71	return ERR_PTR(-ENOMEM);
	72	}
	73
	74	ret = cirrus_framebuffer_init(dev, cirrus_fb, mode_cmd, obj);
	75	if (ret) {
	76	drm_gem_object_unreference_unlocked(obj);
	77	kfree(cirrus_fb);
	78	return ERR_PTR(ret);
	79	}
	80	return &cirrus_fb->base;
	81	}
	82
	83	static const struct drm_mode_config_funcs cirrus_mode_funcs = {
	84	.fb_create = cirrus_user_framebuffer_create,
	85	};
	86
	87	/* Unmap the framebuffer from the core and release the memory */
	88	static void cirrus_vram_fini(struct cirrus_device *cdev)
	89	{
	90	iounmap(cdev->rmmio);
	91	cdev->rmmio = NULL;
	92	if (cdev->mc.vram_base)
	93	release_mem_region(cdev->mc.vram_base, cdev->mc.vram_size);
	94	}
	95
	96	/* Map the framebuffer from the card and configure the core */
	97	static int cirrus_vram_init(struct cirrus_device *cdev)
	98	{
	99	/* BAR 0 is VRAM */
	100	cdev->mc.vram_base = pci_resource_start(cdev->dev->pdev, 0);
8975626e	101	cdev->mc.vram_size = pci_resource_len(cdev->dev->pdev, 0);
f9aa76a8 DA	102
	103	if (!request_mem_region(cdev->mc.vram_base, cdev->mc.vram_size,
	104	"cirrusdrmfb_vram")) {
	105	DRM_ERROR("can't reserve VRAM\n");
	106	return -ENXIO;
	107	}
	108
	109	return 0;
	110	}
	111
	112	/*
	113	* Our emulated hardware has two sets of memory. One is video RAM and can
	114	* simply be used as a linear framebuffer - the other provides mmio access
	115	* to the display registers. The latter can also be accessed via IO port
	116	* access, but we map the range and use mmio to program them instead
	117	*/
	118
	119	int cirrus_device_init(struct cirrus_device *cdev,
	120	struct drm_device *ddev,
	121	struct pci_dev *pdev, uint32_t flags)
	122	{
	123	int ret;
	124
	125	cdev->dev = ddev;
	126	cdev->flags = flags;
	127
	128	/* Hardcode the number of CRTCs to 1 */
	129	cdev->num_crtc = 1;
	130
	131	/* BAR 0 is the framebuffer, BAR 1 contains registers */
	132	cdev->rmmio_base = pci_resource_start(cdev->dev->pdev, 1);
	133	cdev->rmmio_size = pci_resource_len(cdev->dev->pdev, 1);
	134
	135	if (!request_mem_region(cdev->rmmio_base, cdev->rmmio_size,
	136	"cirrusdrmfb_mmio")) {
	137	DRM_ERROR("can't reserve mmio registers\n");
	138	return -ENOMEM;
	139	}
	140
	141	cdev->rmmio = ioremap(cdev->rmmio_base, cdev->rmmio_size);
	142
	143	if (cdev->rmmio == NULL)
	144	return -ENOMEM;
	145
	146	ret = cirrus_vram_init(cdev);
	147	if (ret) {
	148	release_mem_region(cdev->rmmio_base, cdev->rmmio_size);
	149	return ret;
	150	}
	151
	152	return 0;
	153	}
	154
	155	void cirrus_device_fini(struct cirrus_device *cdev)
	156	{
	157	release_mem_region(cdev->rmmio_base, cdev->rmmio_size);
	158	cirrus_vram_fini(cdev);
	159	}
	160
	161	/*
	162	* Functions here will be called by the core once it's bound the driver to
	163	* a PCI device
	164	*/
	165
166	int cirrus_driver_load(struct drm_device *dev, unsigned long flags)
167	{
168	struct cirrus_device *cdev;
169	int r;
170
171	cdev = kzalloc(sizeof(struct cirrus_device), GFP_KERNEL);
172	if (cdev == NULL)
173	return -ENOMEM;
174	dev->dev_private = (void *)cdev;
175
176	r = cirrus_device_init(cdev, dev, dev->pdev, flags);
177	if (r) {
178	dev_err(&dev->pdev->dev, "Fatal error during GPU init: %d\n", r);
179	goto out;
180	}
181
182	r = cirrus_mm_init(cdev);
a7ca52e1	183	if (r) {
f9aa76a8	184	dev_err(&dev->pdev->dev, "fatal err on mm init\n");
a7ca52e1 ZR	185	goto out;
a7ca52e1 ZR	186	}
f9aa76a8	187
36e9d08b BB	188	/*
	189	* cirrus_modeset_init() is initializing/registering the emulated fbdev
	190	* and DRM internals can access/test some of the fields in
	191	* mode_config->funcs as part of the fbdev registration process.
	192	* Make sure dev->mode_config.funcs is properly set to avoid
	193	* dereferencing a NULL pointer.
	194	* FIXME: mode_config.funcs assignment should probably be done in
	195	* cirrus_modeset_init() (that's a common pattern seen in other DRM
	196	* drivers).
	197	*/
	198	dev->mode_config.funcs = &cirrus_mode_funcs;
f9aa76a8	199	r = cirrus_modeset_init(cdev);
a7ca52e1	200	if (r) {
f9aa76a8	201	dev_err(&dev->pdev->dev, "Fatal error during modeset init: %d\n", r);
a7ca52e1 ZR	202	goto out;
a7ca52e1 ZR	203	}
f9aa76a8	204
a7ca52e1	205	return 0;
f9aa76a8	206	out:
a7ca52e1	207	cirrus_driver_unload(dev);
f9aa76a8 DA	208	return r;
	209	}
	210
	211	int cirrus_driver_unload(struct drm_device *dev)
	212	{
	213	struct cirrus_device *cdev = dev->dev_private;
	214
	215	if (cdev == NULL)
	216	return 0;
	217	cirrus_modeset_fini(cdev);
	218	cirrus_mm_fini(cdev);
	219	cirrus_device_fini(cdev);
	220	kfree(cdev);
	221	dev->dev_private = NULL;
	222	return 0;
	223	}
	224
	225	int cirrus_gem_create(struct drm_device *dev,
	226	u32 size, bool iskernel,
	227	struct drm_gem_object **obj)
	228	{
	229	struct cirrus_bo *cirrusbo;
	230	int ret;
	231
	232	*obj = NULL;
	233
	234	size = roundup(size, PAGE_SIZE);
	235	if (size == 0)
	236	return -EINVAL;
	237
	238	ret = cirrus_bo_create(dev, size, 0, 0, &cirrusbo);
	239	if (ret) {
	240	if (ret != -ERESTARTSYS)
	241	DRM_ERROR("failed to allocate GEM object\n");
	242	return ret;
	243	}
	244	*obj = &cirrusbo->gem;
	245	return 0;
	246	}
	247
	248	int cirrus_dumb_create(struct drm_file *file,
	249	struct drm_device *dev,
	250	struct drm_mode_create_dumb *args)
	251	{
	252	int ret;
	253	struct drm_gem_object *gobj;
	254	u32 handle;
	255
	256	args->pitch = args->width * ((args->bpp + 7) / 8);
	257	args->size = args->pitch * args->height;
	258
	259	ret = cirrus_gem_create(dev, args->size, false,
	260	&gobj);
	261	if (ret)
	262	return ret;
	263
	264	ret = drm_gem_handle_create(file, gobj, &handle);
	265	drm_gem_object_unreference_unlocked(gobj);
	266	if (ret)
	267	return ret;
	268
	269	args->handle = handle;
	270	return 0;
	271	}
272
70d5422b	273	static void cirrus_bo_unref(struct cirrus_bo **bo)
f9aa76a8 DA	274	{
	275	struct ttm_buffer_object *tbo;
	276
	277	if ((*bo) == NULL)
	278	return;
	279
	280	tbo = &((*bo)->bo);
	281	ttm_bo_unref(&tbo);
275c6322	282	*bo = NULL;
f9aa76a8 DA	283	}
	284
	285	void cirrus_gem_free_object(struct drm_gem_object *obj)
	286	{
	287	struct cirrus_bo *cirrus_bo = gem_to_cirrus_bo(obj);
	288
f9aa76a8 DA	289	cirrus_bo_unref(&cirrus_bo);
	290	}
	291
	292
	293	static inline u64 cirrus_bo_mmap_offset(struct cirrus_bo *bo)
	294	{
72525b3f	295	return drm_vma_node_offset_addr(&bo->bo.vma_node);
f9aa76a8 DA	296	}
	297
	298	int
	299	cirrus_dumb_mmap_offset(struct drm_file *file,
	300	struct drm_device *dev,
	301	uint32_t handle,
	302	uint64_t *offset)
	303	{
	304	struct drm_gem_object *obj;
f9aa76a8 DA	305	struct cirrus_bo *bo;
f9aa76a8 DA	306
a8ad0bd8	307	obj = drm_gem_object_lookup(file, handle);
6cc56234 DV	308	if (obj == NULL)
6cc56234 DV	309	return -ENOENT;
f9aa76a8 DA	310
	311	bo = gem_to_cirrus_bo(obj);
	312	*offset = cirrus_bo_mmap_offset(bo);
	313
6cc56234	314	drm_gem_object_unreference_unlocked(obj);
f9aa76a8	315
6cc56234	316	return 0;
f9aa76a8	317	}
8975626e ZR	318
	319	bool cirrus_check_framebuffer(struct cirrus_device *cdev, int width, int height,
	320	int bpp, int pitch)
	321	{
	322	const int max_pitch = 0x1FF << 3; /* (4096 - 1) & ~111b bytes */
	323	const int max_size = cdev->mc.vram_size;
	324
7f551b1e TI	325	if (bpp > cirrus_bpp)
7f551b1e TI	326	return false;
8975626e ZR	327	if (bpp > 32)
	328	return false;
	329
	330	if (pitch > max_pitch)
	331	return false;
	332
	333	if (pitch * height > max_size)
	334	return false;
	335
	336	return true;
	337	}