From 0ad98c74e093041eb163b01013eb46989f2124aa Mon Sep 17 00:00:00 2001 From: =?utf8?q?Ville=20Syrj=C3=A4l=C3=A4?= Date: Thu, 8 Oct 2015 12:08:20 +0300 Subject: [PATCH] drm/i915: Determine the stolen memory base address on gen2 MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit 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: [ 0.000000] BIOS-e820: [mem 0x0000000000000000-0x000000000009f7ff] usable [ 0.000000] BIOS-e820: [mem 0x000000000009f800-0x000000000009ffff] reserved [ 0.000000] BIOS-e820: [mem 0x00000000000ce000-0x00000000000cffff] reserved [ 0.000000] BIOS-e820: [mem 0x00000000000dc000-0x00000000000fffff] reserved [ 0.000000] BIOS-e820: [mem 0x0000000000100000-0x000000001f6effff] usable [ 0.000000] BIOS-e820: [mem 0x000000001f6f0000-0x000000001f6f7fff] ACPI data [ 0.000000] BIOS-e820: [mem 0x000000001f6f8000-0x000000001f6fffff] ACPI NVS [ 0.000000] BIOS-e820: [mem 0x000000001f700000-0x000000001fffffff] reserved [ 0.000000] BIOS-e820: [mem 0x00000000fec10000-0x00000000fec1ffff] reserved [ 0.000000] BIOS-e820: [mem 0x00000000ffb00000-0x00000000ffbfffff] reserved [ 0.000000] 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. v2: Rewrite to use the TOM-TSEG_SIZE-stolen_size and TOUD methods v3: Fix TSEG size for 830 v4: Add missing 'else' (Chris) Tested-by: Chris Wilson Signed-off-by: Ville Syrjälä Signed-off-by: Daniel Vetter --- drivers/gpu/drm/i915/i915_gem_stolen.c | 92 +++++++++++++++++++++++--- 1 file changed, 81 insertions(+), 11 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_gem_stolen.c b/drivers/gpu/drm/i915/i915_gem_stolen.c index 69eebc678f01..cdacf3f5b77a 100644 --- a/drivers/gpu/drm/i915/i915_gem_stolen.c +++ b/drivers/gpu/drm/i915/i915_gem_stolen.c @@ -30,6 +30,9 @@ #include #include "i915_drv.h" +#define KB(x) ((x) * 1024) +#define MB(x) (KB(x) * 1024) + /* * 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 @@ -91,24 +94,91 @@ static unsigned long i915_stolen_to_physical(struct drm_device *dev) /* Almost universally we can find the Graphics Base of Stolen Memory * at offset 0x5c in the igfx configuration space. On a few (desktop) * machines this is also mirrored in the bridge device at different - * locations, or in the MCHBAR. On gen2, the layout is again 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. + * locations, or in the MCHBAR. + * + * On 865 we just check the TOUD register. + * + * On 830/845/85x the stolen memory base isn't available in any + * register. We need to calculate it as TOM-TSEG_SIZE-stolen_size. * - * XXX However gen2 requires an unavailable symbol. */ base = 0; if (INTEL_INFO(dev)->gen >= 3) { /* Read Graphics Base of Stolen Memory directly */ pci_read_config_dword(dev->pdev, 0x5c, &base); base &= ~((1<<20) - 1); - } else { /* GEN2 */ -#if 0 - /* Stolen is immediately above Top of Memory */ - base = max_low_pfn_mapped << PAGE_SHIFT; -#endif + } else if (IS_I865G(dev)) { + u16 toud = 0; + + /* + * FIXME is the graphics stolen memory region + * always at TOUD? Ie. is it always the last + * one to be allocated by the BIOS? + */ + pci_bus_read_config_word(dev->pdev->bus, PCI_DEVFN(0, 0), + I865_TOUD, &toud); + + base = toud << 16; + } else if (IS_I85X(dev)) { + u32 tseg_size = 0; + u32 tom; + u8 tmp; + + pci_bus_read_config_byte(dev->pdev->bus, PCI_DEVFN(0, 0), + I85X_ESMRAMC, &tmp); + + if (tmp & TSEG_ENABLE) + tseg_size = MB(1); + + pci_bus_read_config_byte(dev->pdev->bus, PCI_DEVFN(0, 1), + I85X_DRB3, &tmp); + tom = tmp * MB(32); + + base = tom - tseg_size - dev_priv->gtt.stolen_size; + } else if (IS_845G(dev)) { + u32 tseg_size = 0; + u32 tom; + u8 tmp; + + pci_bus_read_config_byte(dev->pdev->bus, PCI_DEVFN(0, 0), + I845_ESMRAMC, &tmp); + + if (tmp & TSEG_ENABLE) { + switch (tmp & I845_TSEG_SIZE_MASK) { + case I845_TSEG_SIZE_512K: + tseg_size = KB(512); + break; + case I845_TSEG_SIZE_1M: + tseg_size = MB(1); + break; + } + } + + pci_bus_read_config_byte(dev->pdev->bus, PCI_DEVFN(0, 0), + I830_DRB3, &tmp); + tom = tmp * MB(32); + + base = tom - tseg_size - dev_priv->gtt.stolen_size; + } else if (IS_I830(dev)) { + u32 tseg_size = 0; + u32 tom; + u8 tmp; + + pci_bus_read_config_byte(dev->pdev->bus, PCI_DEVFN(0, 0), + I830_ESMRAMC, &tmp); + + if (tmp & TSEG_ENABLE) { + if (tmp & I830_TSEG_SIZE_1M) + tseg_size = MB(1); + else + tseg_size = KB(512); + } + + pci_bus_read_config_byte(dev->pdev->bus, PCI_DEVFN(0, 0), + I830_DRB3, &tmp); + tom = tmp * MB(32); + + base = tom - tseg_size - dev_priv->gtt.stolen_size; } if (base == 0) -- 2.30.2