[deliverable/linux.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.
 */

static unsigned long i915_stolen_to_physical(struct drm_device *dev)
{
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct pci_dev *pdev = dev_priv->bridge_dev;
	u32 base;

	/* On the machines I have tested the Graphics Base of Stolen Memory
	 * is unreliable, so on those 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.
	 *
	 * On gen2, the layout is slightly different with the Graphics Segment
	 * immediately following Top of Memory (or Top of Usable DRAM). Note
	 * it appears that TOUD is only reported by 865g, so we just use the
	 * top of memory as determined by the e820 probe.
	 *
	 * XXX gen2 requires an unavailable symbol and 945gm fails with
	 * its value of TOLUD.
	 */
	base = 0;
	if (INTEL_INFO(dev)->gen >= 6) {
		/* Read Base Data of Stolen Memory Register (BDSM) directly.
		 * Note that there is also a MCHBAR miror at 0x1080c0 or
		 * we could use device 2:0x5c instead.
		*/
		pci_read_config_dword(pdev, 0xB0, &base);
		base &= ~4095; /* lower bits used for locking register */
	} else if (INTEL_INFO(dev)->gen > 3 || IS_G33(dev)) {
		/* Read Graphics Base of Stolen Memory directly */
		pci_read_config_dword(pdev, 0xA4, &base);
#if 0
	} else if (IS_GEN3(dev)) {
		u8 val;
		/* Stolen is immediately below Top of Low Usable DRAM */
		pci_read_config_byte(pdev, 0x9c, &val);
		base = val >> 3 << 27;
		base -= dev_priv->mm.gtt->stolen_size;
	} else {
		/* Stolen is immediately above Top of Memory */
		base = max_low_pfn_mapped << PAGE_SHIFT;
#endif
	}

	return base;
}

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 = dev_priv->mm.stolen_base + 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 = dev_priv->mm.stolen_base + 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",
		      (long)cfb_base, (long)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;

	dev_priv->mm.stolen_base = i915_stolen_to_physical(dev);
	if (dev_priv->mm.stolen_base == 0)
		return 0;

	DRM_DEBUG_KMS("found %d bytes of stolen memory at %08lx\n",
		      dev_priv->mm.gtt->stolen_size, dev_priv->mm.stolen_base);

	/* 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
e12a2d53	45	static unsigned long i915_stolen_to_physical(struct drm_device *dev)
9797fbfb CW	46	{
	47	struct drm_i915_private *dev_priv = dev->dev_private;
	48	struct pci_dev *pdev = dev_priv->bridge_dev;
	49	u32 base;
	50
9797fbfb	51	/* On the machines I have tested the Graphics Base of Stolen Memory
e12a2d53 CW	52	* is unreliable, so on those compute the base by subtracting the
	53	* stolen memory from the Top of Low Usable DRAM which is where the
	54	* BIOS places the graphics stolen memory.
	55	*
	56	* On gen2, the layout is slightly different with the Graphics Segment
	57	* immediately following Top of Memory (or Top of Usable DRAM). Note
	58	* it appears that TOUD is only reported by 865g, so we just use the
	59	* top of memory as determined by the e820 probe.
	60	*
	61	* XXX gen2 requires an unavailable symbol and 945gm fails with
	62	* its value of TOLUD.
9797fbfb	63	*/
e12a2d53 CW	64	base = 0;
	65	if (INTEL_INFO(dev)->gen >= 6) {
	66	/* Read Base Data of Stolen Memory Register (BDSM) directly.
	67	* Note that there is also a MCHBAR miror at 0x1080c0 or
	68	* we could use device 2:0x5c instead.
	69	*/
	70	pci_read_config_dword(pdev, 0xB0, &base);
	71	base &= ~4095; /* lower bits used for locking register */
	72	} else if (INTEL_INFO(dev)->gen > 3 \|\| IS_G33(dev)) {
	73	/* Read Graphics Base of Stolen Memory directly */
9797fbfb	74	pci_read_config_dword(pdev, 0xA4, &base);
e12a2d53 CW	75	#if 0
e12a2d53 CW	76	} else if (IS_GEN3(dev)) {
9797fbfb	77	u8 val;
e12a2d53	78	/* Stolen is immediately below Top of Low Usable DRAM */
9797fbfb CW	79	pci_read_config_byte(pdev, 0x9c, &val);
9797fbfb CW	80	base = val >> 3 << 27;
e12a2d53 CW	81	base -= dev_priv->mm.gtt->stolen_size;
	82	} else {
	83	/* Stolen is immediately above Top of Memory */
	84	base = max_low_pfn_mapped << PAGE_SHIFT;
9797fbfb	85	#endif
e12a2d53	86	}
9797fbfb	87
e12a2d53	88	return base;
9797fbfb CW	89	}
	90
	91	static void i915_warn_stolen(struct drm_device *dev)
	92	{
	93	DRM_INFO("not enough stolen space for compressed buffer, disabling\n");
	94	DRM_INFO("hint: you may be able to increase stolen memory size in the BIOS to avoid this\n");
	95	}
	96
	97	static void i915_setup_compression(struct drm_device *dev, int size)
	98	{
	99	struct drm_i915_private *dev_priv = dev->dev_private;
	100	struct drm_mm_node compressed_fb, uninitialized_var(compressed_llb);
	101	unsigned long cfb_base;
	102	unsigned long ll_base = 0;
	103
	104	/* Just in case the BIOS is doing something questionable. */
	105	intel_disable_fbc(dev);
	106
	107	compressed_fb = drm_mm_search_free(&dev_priv->mm.stolen, size, 4096, 0);
	108	if (compressed_fb)
	109	compressed_fb = drm_mm_get_block(compressed_fb, size, 4096);
	110	if (!compressed_fb)
	111	goto err;
	112
e12a2d53	113	cfb_base = dev_priv->mm.stolen_base + compressed_fb->start;
9797fbfb CW	114	if (!cfb_base)
	115	goto err_fb;
	116
	117	if (!(IS_GM45(dev) \|\| HAS_PCH_SPLIT(dev))) {
	118	compressed_llb = drm_mm_search_free(&dev_priv->mm.stolen,
	119	4096, 4096, 0);
	120	if (compressed_llb)
	121	compressed_llb = drm_mm_get_block(compressed_llb,
	122	4096, 4096);
	123	if (!compressed_llb)
	124	goto err_fb;
	125
e12a2d53	126	ll_base = dev_priv->mm.stolen_base + compressed_llb->start;
9797fbfb CW	127	if (!ll_base)
	128	goto err_llb;
	129	}
	130
	131	dev_priv->cfb_size = size;
	132
	133	dev_priv->compressed_fb = compressed_fb;
	134	if (HAS_PCH_SPLIT(dev))
	135	I915_WRITE(ILK_DPFC_CB_BASE, compressed_fb->start);
	136	else if (IS_GM45(dev)) {
	137	I915_WRITE(DPFC_CB_BASE, compressed_fb->start);
	138	} else {
	139	I915_WRITE(FBC_CFB_BASE, cfb_base);
	140	I915_WRITE(FBC_LL_BASE, ll_base);
	141	dev_priv->compressed_llb = compressed_llb;
	142	}
	143
	144	DRM_DEBUG_KMS("FBC base 0x%08lx, ll base 0x%08lx, size %dM\n",
e12a2d53	145	(long)cfb_base, (long)ll_base, size >> 20);
9797fbfb CW	146	return;
	147
	148	err_llb:
	149	drm_mm_put_block(compressed_llb);
	150	err_fb:
	151	drm_mm_put_block(compressed_fb);
	152	err:
	153	dev_priv->no_fbc_reason = FBC_STOLEN_TOO_SMALL;
	154	i915_warn_stolen(dev);
	155	}
	156
	157	static void i915_cleanup_compression(struct drm_device *dev)
	158	{
	159	struct drm_i915_private *dev_priv = dev->dev_private;
	160
	161	drm_mm_put_block(dev_priv->compressed_fb);
	162	if (dev_priv->compressed_llb)
	163	drm_mm_put_block(dev_priv->compressed_llb);
	164	}
	165
	166	void i915_gem_cleanup_stolen(struct drm_device *dev)
	167	{
	168	if (I915_HAS_FBC(dev) && i915_powersave)
	169	i915_cleanup_compression(dev);
	170	}
	171
	172	int i915_gem_init_stolen(struct drm_device *dev)
	173	{
	174	struct drm_i915_private *dev_priv = dev->dev_private;
	175	unsigned long prealloc_size = dev_priv->mm.gtt->stolen_size;
	176
e12a2d53 CW	177	dev_priv->mm.stolen_base = i915_stolen_to_physical(dev);
	178	if (dev_priv->mm.stolen_base == 0)
	179	return 0;
	180
	181	DRM_DEBUG_KMS("found %d bytes of stolen memory at %08lx\n",
	182	dev_priv->mm.gtt->stolen_size, dev_priv->mm.stolen_base);
	183
9797fbfb CW	184	/* Basic memrange allocator for stolen space */
	185	drm_mm_init(&dev_priv->mm.stolen, 0, prealloc_size);
	186
	187	/* Try to set up FBC with a reasonable compressed buffer size */
	188	if (I915_HAS_FBC(dev) && i915_powersave) {
	189	int cfb_size;
	190
	191	/* Leave 1M for line length buffer & misc. */
	192
	193	/* Try to get a 32M buffer... */
	194	if (prealloc_size > (3610241024))
	195	cfb_size = 3210241024;
	196	else /* fall back to 7/8 of the stolen space */
	197	cfb_size = prealloc_size * 7 / 8;
	198	i915_setup_compression(dev, cfb_size);
	199	}
	200
	201	return 0;
	202	}