Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758751AbZAWWyq (ORCPT ); Fri, 23 Jan 2009 17:54:46 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1757563AbZAWWyX (ORCPT ); Fri, 23 Jan 2009 17:54:23 -0500 Received: from 69-30-77-85.dq1sn.easystreet.com ([69.30.77.85]:63396 "EHLO camus.anholt.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757513AbZAWWyW (ORCPT ); Fri, 23 Jan 2009 17:54:22 -0500 From: Eric Anholt To: linux-kernel@vger.kernel.org Cc: Eric Anholt Subject: [PATCH] drm/i915: Set up an MTRR covering the GTT at driver load. Date: Fri, 23 Jan 2009 14:54:17 -0800 Message-Id: <1232751258-32611-1-git-send-email-eric@anholt.net> X-Mailer: git-send-email 1.5.6.5 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3948 Lines: 116 We'd love to just be using PAT, but even on chips with PAT it gets disabled sometimes due to an errata. It would probably be better to have pat_enabled exported and only bother with this when !pat_enabled. --- drivers/gpu/drm/i915/i915_dma.c | 30 +++++++++++++++++++++++++----- drivers/gpu/drm/i915/i915_drv.h | 1 + drivers/gpu/drm/i915/i915_gem.c | 6 ------ 3 files changed, 26 insertions(+), 11 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c index 439d271..c391568 100644 --- a/drivers/gpu/drm/i915/i915_dma.c +++ b/drivers/gpu/drm/i915/i915_dma.c @@ -968,10 +968,6 @@ static int i915_load_modeset_init(struct drm_device *dev) if (ret) goto kfree_devname; - dev_priv->mm.gtt_mapping = - io_mapping_create_wc(dev->agp->base, - dev->agp->agp_info.aper_size * 1024*1024); - /* Allow hardware batchbuffers unless told otherwise. */ dev_priv->allow_batchbuffer = 1; @@ -1083,6 +1079,24 @@ int i915_driver_load(struct drm_device *dev, unsigned long flags) goto free_priv; } + dev_priv->mm.gtt_mapping = + io_mapping_create_wc(dev->agp->base, + dev->agp->agp_info.aper_size * 1024*1024); + /* Set up a WC MTRR for non-PAT systems. This is more common than + * one would think, because the kernel disables PAT on first + * generation Core chips because WC PAT gets overridden by a UC + * MTRR if present. Even if a UC MTRR isn't present. + */ + dev_priv->mm.gtt_mtrr = -1; + dev_priv->mm.gtt_mtrr = mtrr_add(dev->agp->base, + dev->agp->agp_info.aper_size * + 1024 * 1024, + MTRR_TYPE_WRCOMB, 1); + if (dev_priv->mm.gtt_mtrr < 0) { + DRM_INFO("MTRR allocation failed\n. Graphics " + "performance may suffer.\n"); + } + #ifdef CONFIG_HIGHMEM64G /* don't enable GEM on PAE - needs agp + set_memory_* interface fixes */ dev_priv->has_gem = 0; @@ -1147,8 +1161,14 @@ int i915_driver_unload(struct drm_device *dev) { struct drm_i915_private *dev_priv = dev->dev_private; + io_mapping_free(dev_priv->mm.gtt_mapping); + if (dev_priv->mm.gtt_mtrr >= 0) { + mtrr_del(dev_priv->mm.gtt_mtrr, dev->agp->base, + dev->agp->agp_info.aper_size * 1024 * 1024); + dev_priv->mm.gtt_mtrr = -1; + } + if (drm_core_check_feature(dev, DRIVER_MODESET)) { - io_mapping_free(dev_priv->mm.gtt_mapping); drm_irq_uninstall(dev); } diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h index e135182..f471d21 100644 --- a/drivers/gpu/drm/i915/i915_drv.h +++ b/drivers/gpu/drm/i915/i915_drv.h @@ -284,6 +284,7 @@ typedef struct drm_i915_private { struct drm_mm gtt_space; struct io_mapping *gtt_mapping; + int gtt_mtrr; /** * List of objects currently involved in rendering from the diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c index 3741101..66a2dc1 100644 --- a/drivers/gpu/drm/i915/i915_gem.c +++ b/drivers/gpu/drm/i915/i915_gem.c @@ -3229,10 +3229,6 @@ i915_gem_entervt_ioctl(struct drm_device *dev, void *data, dev_priv->mm.wedged = 0; } - dev_priv->mm.gtt_mapping = io_mapping_create_wc(dev->agp->base, - dev->agp->agp_info.aper_size - * 1024 * 1024); - mutex_lock(&dev->struct_mutex); dev_priv->mm.suspended = 0; @@ -3255,7 +3251,6 @@ int i915_gem_leavevt_ioctl(struct drm_device *dev, void *data, struct drm_file *file_priv) { - drm_i915_private_t *dev_priv = dev->dev_private; int ret; if (drm_core_check_feature(dev, DRIVER_MODESET)) @@ -3264,7 +3259,6 @@ i915_gem_leavevt_ioctl(struct drm_device *dev, void *data, ret = i915_gem_idle(dev); drm_irq_uninstall(dev); - io_mapping_free(dev_priv->mm.gtt_mapping); return ret; } -- 1.5.6.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/