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There isn't an explicit stolen memory base register on gen2. Some old comment in the i915 code suggests we should get it via max_low_pfn_mapped, but that's clearly a bad idea on my MGM. The e820 map in said machine looks like this: BIOS-e820: [mem 0x0000000000000000-0x000000000009f7ff] usable BIOS-e820: [mem 0x000000000009f800-0x000000000009ffff] reserved BIOS-e820: [mem 0x00000000000ce000-0x00000000000cffff] reserved BIOS-e820: [mem 0x00000000000dc000-0x00000000000fffff] reserved BIOS-e820: [mem 0x0000000000100000-0x000000001f6effff] usable BIOS-e820: [mem 0x000000001f6f0000-0x000000001f6f7fff] ACPI data BIOS-e820: [mem 0x000000001f6f8000-0x000000001f6fffff] ACPI NVS BIOS-e820: [mem 0x000000001f700000-0x000000001fffffff] reserved BIOS-e820: [mem 0x00000000fec10000-0x00000000fec1ffff] reserved BIOS-e820: [mem 0x00000000ffb00000-0x00000000ffbfffff] reserved BIOS-e820: [mem 0x00000000fff00000-0x00000000ffffffff] reserved That makes max_low_pfn_mapped = 1f6f0000, so assuming our stolen memory would start there would place it on top of some ACPI memory regions. So not a good idea as already stated. The 9MB region after the ACPI regions at 0x1f700000 however looks promising given that the macine reports the stolen memory size to be 8MB. Looking at the PGTBL_CTL register, the GTT entries are at offset 0x1fee00000, and given that the GTT entries occupy 128KB, it looks like the stolen memory could start at 0x1f700000 and the GTT entries would occupy the last 128KB of the stolen memory. After some more digging through chipset documentation, I've determined the BIOS first allocates space for something called TSEG (something to do with SMM) from the top of memory, and then it allocates the graphics stolen memory below that. Accordind to the chipset documentation TSEG has a fixed size of 1MB on 855. So that explains the top 1MB in the e820 region. And it also confirms that the GTT entries are in fact at the end of the the stolen memory region. Derive the stolen memory base address on gen2 the same as the BIOS does (TOM-TSEG_SIZE-stolen_size). There are a few differences between the registers on various gen2 chipsets, so a few different codepaths are required. 865G is again bit more special since it seems to support enough memory to hit 4GB address space issues. This means the PCI allocations will also affect the location of the stolen memory. Fortunately there appears to be the TOUD register which may give us the correct answer directly. But the chipset docs are a bit unclear, so I'm not 100% sure that the graphics stolen memory is always the last thing the BIOS steals. Someone would need to verify it on a real system. I tested this on the my 830 and 855 machines, and so far everything looks peachy. Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Cc: Bjorn Helgaas <bhelgaas@google.com> Link: http://lkml.kernel.org/r/1391628540-23072-3-git-send-email-ville.syrjala@linux.intel.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
96 lines
3.4 KiB
C
96 lines
3.4 KiB
C
/*
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* Copyright 2003 Tungsten Graphics, Inc., Cedar Park, Texas.
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* All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sub license, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice (including the
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* next paragraph) shall be included in all copies or substantial portions
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* of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
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* IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
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* ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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*/
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#ifndef _I915_DRM_H_
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#define _I915_DRM_H_
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#include <drm/i915_pciids.h>
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#include <uapi/drm/i915_drm.h>
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/* For use by IPS driver */
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extern unsigned long i915_read_mch_val(void);
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extern bool i915_gpu_raise(void);
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extern bool i915_gpu_lower(void);
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extern bool i915_gpu_busy(void);
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extern bool i915_gpu_turbo_disable(void);
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/*
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* The Bridge device's PCI config space has information about the
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* fb aperture size and the amount of pre-reserved memory.
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* This is all handled in the intel-gtt.ko module. i915.ko only
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* cares about the vga bit for the vga rbiter.
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*/
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#define INTEL_GMCH_CTRL 0x52
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#define INTEL_GMCH_VGA_DISABLE (1 << 1)
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#define SNB_GMCH_CTRL 0x50
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#define SNB_GMCH_GGMS_SHIFT 8 /* GTT Graphics Memory Size */
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#define SNB_GMCH_GGMS_MASK 0x3
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#define SNB_GMCH_GMS_SHIFT 3 /* Graphics Mode Select */
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#define SNB_GMCH_GMS_MASK 0x1f
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#define BDW_GMCH_GGMS_SHIFT 6
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#define BDW_GMCH_GGMS_MASK 0x3
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#define BDW_GMCH_GMS_SHIFT 8
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#define BDW_GMCH_GMS_MASK 0xff
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#define I830_GMCH_CTRL 0x52
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#define I830_GMCH_GMS_MASK 0x70
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#define I830_GMCH_GMS_LOCAL 0x10
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#define I830_GMCH_GMS_STOLEN_512 0x20
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#define I830_GMCH_GMS_STOLEN_1024 0x30
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#define I830_GMCH_GMS_STOLEN_8192 0x40
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#define I855_GMCH_GMS_MASK 0xF0
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#define I855_GMCH_GMS_STOLEN_0M 0x0
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#define I855_GMCH_GMS_STOLEN_1M (0x1 << 4)
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#define I855_GMCH_GMS_STOLEN_4M (0x2 << 4)
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#define I855_GMCH_GMS_STOLEN_8M (0x3 << 4)
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#define I855_GMCH_GMS_STOLEN_16M (0x4 << 4)
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#define I855_GMCH_GMS_STOLEN_32M (0x5 << 4)
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#define I915_GMCH_GMS_STOLEN_48M (0x6 << 4)
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#define I915_GMCH_GMS_STOLEN_64M (0x7 << 4)
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#define G33_GMCH_GMS_STOLEN_128M (0x8 << 4)
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#define G33_GMCH_GMS_STOLEN_256M (0x9 << 4)
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#define INTEL_GMCH_GMS_STOLEN_96M (0xa << 4)
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#define INTEL_GMCH_GMS_STOLEN_160M (0xb << 4)
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#define INTEL_GMCH_GMS_STOLEN_224M (0xc << 4)
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#define INTEL_GMCH_GMS_STOLEN_352M (0xd << 4)
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#define I830_DRB3 0x63
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#define I85X_DRB3 0x43
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#define I865_TOUD 0xc4
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#define I830_ESMRAMC 0x91
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#define I845_ESMRAMC 0x9e
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#define I85X_ESMRAMC 0x61
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#define TSEG_ENABLE (1 << 0)
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#define I830_TSEG_SIZE_512K (0 << 1)
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#define I830_TSEG_SIZE_1M (1 << 1)
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#define I845_TSEG_SIZE_MASK (3 << 1)
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#define I845_TSEG_SIZE_512K (2 << 1)
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#define I845_TSEG_SIZE_1M (3 << 1)
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#endif /* _I915_DRM_H_ */
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