WebSVN – Kolibri OS – Blame – /drivers/video/drm/i915/i915_gem_stolen.c

Rev	Author	Line No.	Line
3031	serge	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
		25	* Chris Wilson
		26	*
		27	*/
		28
		29	#include
		30	#include
		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	}

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(root)/drivers/video/drm/i915/i915_gem_stolen.c @ 3764 – Rev 3031