[linux-2.6-block.git] / drivers / gpu / drm / i915 / i915_gem_stolen.c

/*
 * Copyright © 2008-2012 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:
 *    Eric Anholt <eric@anholt.net>
 *    Chris Wilson <chris@chris-wilson.co.uk>
 *
 */

#include <drm/drmP.h>
#include <drm/i915_drm.h>
#include "i915_drv.h"

/*
 * The BIOS typically reserves some of the system's memory for the exclusive
 * use of the integrated graphics. This memory is no longer available for
 * use by the OS and so the user finds that his system has less memory
 * available than he put in. We refer to this memory as stolen.
 *
 * The BIOS will allocate its framebuffer from the stolen memory. Our
 * goal is try to reuse that object for our own fbcon which must always
 * be available for panics. Anything else we can reuse the stolen memory
 * for is a boon.
 */

#define PTE_ADDRESS_MASK		0xfffff000
#define PTE_ADDRESS_MASK_HIGH		0x000000f0 /* i915+ */
#define PTE_MAPPING_TYPE_UNCACHED	(0 << 1)
#define PTE_MAPPING_TYPE_DCACHE		(1 << 1) /* i830 only */
#define PTE_MAPPING_TYPE_CACHED		(3 << 1)
#define PTE_MAPPING_TYPE_MASK		(3 << 1)
#define PTE_VALID			(1 << 0)

/**
 * i915_stolen_to_phys - take an offset into stolen memory and turn it into
 *                       a physical one
 * @dev: drm device
 * @offset: address to translate
 *
 * Some chip functions require allocations from stolen space and need the
 * physical address of the memory in question.
 */
static unsigned long i915_stolen_to_phys(struct drm_device *dev, u32 offset)
{
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct pci_dev *pdev = dev_priv->bridge_dev;
	u32 base;

#if 0
	/* On the machines I have tested the Graphics Base of Stolen Memory
	 * is unreliable, so compute the base by subtracting the stolen memory
	 * from the Top of Low Usable DRAM which is where the BIOS places
	 * the graphics stolen memory.
	 */
	if (INTEL_INFO(dev)->gen > 3 || IS_G33(dev)) {
		/* top 32bits are reserved = 0 */
		pci_read_config_dword(pdev, 0xA4, &base);
	} else {
		/* XXX presume 8xx is the same as i915 */
		pci_bus_read_config_dword(pdev->bus, 2, 0x5C, &base);
	}
#else
	if (INTEL_INFO(dev)->gen > 3 || IS_G33(dev)) {
		u16 val;
		pci_read_config_word(pdev, 0xb0, &val);
		base = val >> 4 << 20;
	} else {
		u8 val;
		pci_read_config_byte(pdev, 0x9c, &val);
		base = val >> 3 << 27;
	}
	base -= dev_priv->mm.gtt->stolen_size;
#endif

	return base + offset;
}

static void i915_warn_stolen(struct drm_device *dev)
{
	DRM_INFO("not enough stolen space for compressed buffer, disabling\n");
	DRM_INFO("hint: you may be able to increase stolen memory size in the BIOS to avoid this\n");
}

static void i915_setup_compression(struct drm_device *dev, int size)
{
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct drm_mm_node *compressed_fb, *uninitialized_var(compressed_llb);
	unsigned long cfb_base;
	unsigned long ll_base = 0;

	/* Just in case the BIOS is doing something questionable. */
	intel_disable_fbc(dev);

	compressed_fb = drm_mm_search_free(&dev_priv->mm.stolen, size, 4096, 0);
	if (compressed_fb)
		compressed_fb = drm_mm_get_block(compressed_fb, size, 4096);
	if (!compressed_fb)
		goto err;

	cfb_base = i915_stolen_to_phys(dev, compressed_fb->start);
	if (!cfb_base)
		goto err_fb;

	if (!(IS_GM45(dev) || HAS_PCH_SPLIT(dev))) {
		compressed_llb = drm_mm_search_free(&dev_priv->mm.stolen,
						    4096, 4096, 0);
		if (compressed_llb)
			compressed_llb = drm_mm_get_block(compressed_llb,
							  4096, 4096);
		if (!compressed_llb)
			goto err_fb;

		ll_base = i915_stolen_to_phys(dev, compressed_llb->start);
		if (!ll_base)
			goto err_llb;
	}

	dev_priv->cfb_size = size;

	dev_priv->compressed_fb = compressed_fb;
	if (HAS_PCH_SPLIT(dev))
		I915_WRITE(ILK_DPFC_CB_BASE, compressed_fb->start);
	else if (IS_GM45(dev)) {
		I915_WRITE(DPFC_CB_BASE, compressed_fb->start);
	} else {
		I915_WRITE(FBC_CFB_BASE, cfb_base);
		I915_WRITE(FBC_LL_BASE, ll_base);
		dev_priv->compressed_llb = compressed_llb;
	}

	DRM_DEBUG_KMS("FBC base 0x%08lx, ll base 0x%08lx, size %dM\n",
		      cfb_base, ll_base, size >> 20);
	return;

err_llb:
	drm_mm_put_block(compressed_llb);
err_fb:
	drm_mm_put_block(compressed_fb);
err:
	dev_priv->no_fbc_reason = FBC_STOLEN_TOO_SMALL;
	i915_warn_stolen(dev);
}

static void i915_cleanup_compression(struct drm_device *dev)
{
	struct drm_i915_private *dev_priv = dev->dev_private;

	drm_mm_put_block(dev_priv->compressed_fb);
	if (dev_priv->compressed_llb)
		drm_mm_put_block(dev_priv->compressed_llb);
}

void i915_gem_cleanup_stolen(struct drm_device *dev)
{
	if (I915_HAS_FBC(dev) && i915_powersave)
		i915_cleanup_compression(dev);
}

int i915_gem_init_stolen(struct drm_device *dev)
{
	struct drm_i915_private *dev_priv = dev->dev_private;
	unsigned long prealloc_size = dev_priv->mm.gtt->stolen_size;

	/* Basic memrange allocator for stolen space */
	drm_mm_init(&dev_priv->mm.stolen, 0, prealloc_size);

	/* Try to set up FBC with a reasonable compressed buffer size */
	if (I915_HAS_FBC(dev) && i915_powersave) {
		int cfb_size;

		/* Leave 1M for line length buffer & misc. */

		/* Try to get a 32M buffer... */
		if (prealloc_size > (36*1024*1024))
			cfb_size = 32*1024*1024;
		else /* fall back to 7/8 of the stolen space */
			cfb_size = prealloc_size * 7 / 8;
		i915_setup_compression(dev, cfb_size);
	}

	return 0;
}
Commit	Line	Data
9797fbfb CW	1	/*
	2	* Copyright © 2008-2012 Intel Corporation
	3	*
	4	* Permission is hereby granted, free of charge, to any person obtaining a
	5	* copy of this software and associated documentation files (the "Software"),
	6	* to deal in the Software without restriction, including without limitation
	7	* the rights to use, copy, modify, merge, publish, distribute, sublicense,
	8	* and/or sell copies of the Software, and to permit persons to whom the
	9	* Software is furnished to do so, subject to the following conditions:
	10	*
	11	* The above copyright notice and this permission notice (including the next
	12	* paragraph) shall be included in all copies or substantial portions of the
	13	* Software.
	14	*
	15	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	16	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	17	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
	18	* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
	19	* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
	20	* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
	21	* IN THE SOFTWARE.
	22	*
	23	* Authors:
	24	* Eric Anholt <eric@anholt.net>
	25	* Chris Wilson <chris@chris-wilson.co.uk>
	26	*
	27	*/
	28
760285e7 DH	29	#include <drm/drmP.h>
760285e7 DH	30	#include <drm/i915_drm.h>
9797fbfb CW	31	#include "i915_drv.h"
	32
	33	/*
	34	* The BIOS typically reserves some of the system's memory for the exclusive
	35	* use of the integrated graphics. This memory is no longer available for
	36	* use by the OS and so the user finds that his system has less memory
	37	* available than he put in. We refer to this memory as stolen.
	38	*
	39	* The BIOS will allocate its framebuffer from the stolen memory. Our
	40	* goal is try to reuse that object for our own fbcon which must always
	41	* be available for panics. Anything else we can reuse the stolen memory
	42	* for is a boon.
	43	*/
	44
	45	#define PTE_ADDRESS_MASK 0xfffff000
	46	#define PTE_ADDRESS_MASK_HIGH 0x000000f0 /* i915+ */
	47	#define PTE_MAPPING_TYPE_UNCACHED (0 << 1)
	48	#define PTE_MAPPING_TYPE_DCACHE (1 << 1) /* i830 only */
	49	#define PTE_MAPPING_TYPE_CACHED (3 << 1)
	50	#define PTE_MAPPING_TYPE_MASK (3 << 1)
	51	#define PTE_VALID (1 << 0)
	52
	53	/**
	54	* i915_stolen_to_phys - take an offset into stolen memory and turn it into
	55	* a physical one
	56	* @dev: drm device
	57	* @offset: address to translate
	58	*
	59	* Some chip functions require allocations from stolen space and need the
	60	* physical address of the memory in question.
	61	*/
	62	static unsigned long i915_stolen_to_phys(struct drm_device *dev, u32 offset)
	63	{
	64	struct drm_i915_private *dev_priv = dev->dev_private;
	65	struct pci_dev *pdev = dev_priv->bridge_dev;
	66	u32 base;
	67
	68	#if 0
	69	/* On the machines I have tested the Graphics Base of Stolen Memory
	70	* is unreliable, so compute the base by subtracting the stolen memory
	71	* from the Top of Low Usable DRAM which is where the BIOS places
	72	* the graphics stolen memory.
	73	*/
	74	if (INTEL_INFO(dev)->gen > 3 \|\| IS_G33(dev)) {
	75	/* top 32bits are reserved = 0 */
	76	pci_read_config_dword(pdev, 0xA4, &base);
	77	} else {
	78	/* XXX presume 8xx is the same as i915 */
	79	pci_bus_read_config_dword(pdev->bus, 2, 0x5C, &base);
	80	}
	81	#else
	82	if (INTEL_INFO(dev)->gen > 3 \|\| IS_G33(dev)) {
	83	u16 val;
	84	pci_read_config_word(pdev, 0xb0, &val);
	85	base = val >> 4 << 20;
	86	} else {
	87	u8 val;
	88	pci_read_config_byte(pdev, 0x9c, &val);
	89	base = val >> 3 << 27;
	90	}
	91	base -= dev_priv->mm.gtt->stolen_size;
	92	#endif
	93
	94	return base + offset;
95	}
96
97	static void i915_warn_stolen(struct drm_device *dev)
98	{
99	DRM_INFO("not enough stolen space for compressed buffer, disabling\n");
100	DRM_INFO("hint: you may be able to increase stolen memory size in the BIOS to avoid this\n");
101	}
102
103	static void i915_setup_compression(struct drm_device *dev, int size)
104	{
105	struct drm_i915_private *dev_priv = dev->dev_private;
106	struct drm_mm_node compressed_fb, uninitialized_var(compressed_llb);
107	unsigned long cfb_base;
108	unsigned long ll_base = 0;
109
110	/* Just in case the BIOS is doing something questionable. */
111	intel_disable_fbc(dev);
112
113	compressed_fb = drm_mm_search_free(&dev_priv->mm.stolen, size, 4096, 0);
114	if (compressed_fb)
115	compressed_fb = drm_mm_get_block(compressed_fb, size, 4096);
116	if (!compressed_fb)
117	goto err;
118
119	cfb_base = i915_stolen_to_phys(dev, compressed_fb->start);
120	if (!cfb_base)
121	goto err_fb;
122
123	if (!(IS_GM45(dev) \|\| HAS_PCH_SPLIT(dev))) {
124	compressed_llb = drm_mm_search_free(&dev_priv->mm.stolen,
125	4096, 4096, 0);
126	if (compressed_llb)
127	compressed_llb = drm_mm_get_block(compressed_llb,
128	4096, 4096);
129	if (!compressed_llb)
130	goto err_fb;
131
132	ll_base = i915_stolen_to_phys(dev, compressed_llb->start);
133	if (!ll_base)
134	goto err_llb;
135	}
136
137	dev_priv->cfb_size = size;
138
139	dev_priv->compressed_fb = compressed_fb;
140	if (HAS_PCH_SPLIT(dev))
141	I915_WRITE(ILK_DPFC_CB_BASE, compressed_fb->start);
142	else if (IS_GM45(dev)) {
143	I915_WRITE(DPFC_CB_BASE, compressed_fb->start);
144	} else {
145	I915_WRITE(FBC_CFB_BASE, cfb_base);
146	I915_WRITE(FBC_LL_BASE, ll_base);
147	dev_priv->compressed_llb = compressed_llb;
148	}
149
150	DRM_DEBUG_KMS("FBC base 0x%08lx, ll base 0x%08lx, size %dM\n",
151	cfb_base, ll_base, size >> 20);
152	return;
153
154	err_llb:
155	drm_mm_put_block(compressed_llb);
156	err_fb:
157	drm_mm_put_block(compressed_fb);
158	err:
159	dev_priv->no_fbc_reason = FBC_STOLEN_TOO_SMALL;
160	i915_warn_stolen(dev);
161	}
162
163	static void i915_cleanup_compression(struct drm_device *dev)
164	{
165	struct drm_i915_private *dev_priv = dev->dev_private;
166
167	drm_mm_put_block(dev_priv->compressed_fb);
168	if (dev_priv->compressed_llb)
169	drm_mm_put_block(dev_priv->compressed_llb);
170	}
171
172	void i915_gem_cleanup_stolen(struct drm_device *dev)
173	{
174	if (I915_HAS_FBC(dev) && i915_powersave)
175	i915_cleanup_compression(dev);
176	}
177
178	int i915_gem_init_stolen(struct drm_device *dev)
179	{
180	struct drm_i915_private *dev_priv = dev->dev_private;
181	unsigned long prealloc_size = dev_priv->mm.gtt->stolen_size;
182
183	/* Basic memrange allocator for stolen space */
184	drm_mm_init(&dev_priv->mm.stolen, 0, prealloc_size);
185
186	/* Try to set up FBC with a reasonable compressed buffer size */
187	if (I915_HAS_FBC(dev) && i915_powersave) {
188	int cfb_size;
189
190	/* Leave 1M for line length buffer & misc. */
191
192	/* Try to get a 32M buffer... */
193	if (prealloc_size > (3610241024))
194	cfb_size = 3210241024;
195	else /* fall back to 7/8 of the stolen space */
196	cfb_size = prealloc_size * 7 / 8;
197	i915_setup_compression(dev, cfb_size);
198	}
199
200	return 0;
201	}