From da88a5f7f7d434e2cde1b3e19d952e6d84533662 Mon Sep 17 00:00:00 2001 From: Chris Wilson Date: Wed, 13 Feb 2013 09:31:53 +0000 Subject: [PATCH] drm/i915: Disable WC PTE updates to w/a buggy IOMMU on ILK Whilst IOMMU is enabled for the Intel GPU on Ironlake, it appears that using WC writes to update the PTE on the GPU fails miserably. The result looks like the majority of the writes do not land leading to lots of screen corruption and a hard system hang. v2: s/ Bugzilla: https://bugzilla.freedesktop.org/show_bug.cgi?id=60391 Signed-off-by: Chris Wilson Tested-by: Nathan Myers [danvet: Remove cc: stable and add tested-by.] Signed-off-by: Daniel Vetter --- drivers/char/agp/intel-gtt.c | 37 ++++++++++++++++++++++++++++++++++-- 1 file changed, 35 insertions(+), 2 deletions(-) diff --git a/drivers/char/agp/intel-gtt.c b/drivers/char/agp/intel-gtt.c index 207e5c36e9ec..b8e2014cb9cb 100644 --- a/drivers/char/agp/intel-gtt.c +++ b/drivers/char/agp/intel-gtt.c @@ -572,6 +572,40 @@ static void intel_gtt_cleanup(void) intel_gtt_teardown_scratch_page(); } +/* Certain Gen5 chipsets require require idling the GPU before + * unmapping anything from the GTT when VT-d is enabled. + */ +static inline int needs_ilk_vtd_wa(void) +{ +#ifdef CONFIG_INTEL_IOMMU + const unsigned short gpu_devid = intel_private.pcidev->device; + + /* Query intel_iommu to see if we need the workaround. Presumably that + * was loaded first. + */ + if ((gpu_devid == PCI_DEVICE_ID_INTEL_IRONLAKE_M_HB || + gpu_devid == PCI_DEVICE_ID_INTEL_IRONLAKE_M_IG) && + intel_iommu_gfx_mapped) + return 1; +#endif + return 0; +} + +static bool intel_gtt_can_wc(void) +{ + if (INTEL_GTT_GEN <= 2) + return false; + + if (INTEL_GTT_GEN >= 6) + return false; + + /* Reports of major corruption with ILK vt'd enabled */ + if (needs_ilk_vtd_wa()) + return false; + + return true; +} + static int intel_gtt_init(void) { u32 gma_addr; @@ -601,7 +635,7 @@ static int intel_gtt_init(void) gtt_map_size = intel_private.gtt_total_entries * 4; intel_private.gtt = NULL; - if (INTEL_GTT_GEN < 6 && INTEL_GTT_GEN > 2) + if (intel_gtt_can_wc()) intel_private.gtt = ioremap_wc(intel_private.gtt_bus_addr, gtt_map_size); if (intel_private.gtt == NULL) @@ -1072,7 +1106,6 @@ static void i965_write_entry(dma_addr_t addr, writel(addr | pte_flags, intel_private.gtt + entry); } - static int i9xx_setup(void) { u32 reg_addr, gtt_addr; -- 2.30.2