From 8d2e630899165d413ae8a2adc36846ac0b71bada Mon Sep 17 00:00:00 2001 From: Ben Widawsky Date: Fri, 18 Jan 2013 12:30:33 -0800 Subject: [PATCH] drm/i915: Needs_dmar, not The reasoning behind our code taking two paths depending upon whether or not we may have been configured for IOMMU isn't clear to me. It should always be safe to use the pci mapping functions as they are designed to abstract the decision we were handling in i915. Aside from simpler code, removing another member for the intel_gtt struct is a nice motivation. I ran this by Chris, and he wasn't concerned about the extra kzalloc, and memory references vs. page_to_phys calculation in the case without IOMMU. v2: Update commit message v3: Remove needs_dmar addition from Zhenyu upstream This reverts (and then other stuff) commit 20652097dadd9a7fb4d652f25466299974bc78f9 Author: Zhenyu Wang Date: Thu Dec 13 23:47:47 2012 +0800 drm/i915: Fix missed needs_dmar setting Reviewed-by: Rodrigo Vivi (v2) Cc: Zhenyu Wang Signed-off-by: Ben Widawsky [danvet: Squash in follow-up fix to remove the bogus hunk which deleted the dma_mask configuration for gen6+.] Signed-off-by: Daniel Vetter --- drivers/char/agp/intel-gtt.c | 10 ++++--- drivers/gpu/drm/i915/i915_gem_gtt.c | 45 ++++++++++------------------- include/drm/intel-gtt.h | 2 -- 3 files changed, 22 insertions(+), 35 deletions(-) diff --git a/drivers/char/agp/intel-gtt.c b/drivers/char/agp/intel-gtt.c index 7fcee5c2e986..b45241479a56 100644 --- a/drivers/char/agp/intel-gtt.c +++ b/drivers/char/agp/intel-gtt.c @@ -77,6 +77,8 @@ static struct _intel_private { struct page *scratch_page; phys_addr_t scratch_page_dma; int refcount; + /* Whether i915 needs to use the dmar apis or not. */ + unsigned int needs_dmar : 1; } intel_private; #define INTEL_GTT_GEN intel_private.driver->gen @@ -292,7 +294,7 @@ static int intel_gtt_setup_scratch_page(void) get_page(page); set_pages_uc(page, 1); - if (intel_private.base.needs_dmar) { + if (intel_private.needs_dmar) { dma_addr = pci_map_page(intel_private.pcidev, page, 0, PAGE_SIZE, PCI_DMA_BIDIRECTIONAL); if (pci_dma_mapping_error(intel_private.pcidev, dma_addr)) @@ -608,7 +610,7 @@ static int intel_gtt_init(void) intel_private.base.stolen_size = intel_gtt_stolen_size(); - intel_private.base.needs_dmar = USE_PCI_DMA_API && INTEL_GTT_GEN > 2; + intel_private.needs_dmar = USE_PCI_DMA_API && INTEL_GTT_GEN > 2; ret = intel_gtt_setup_scratch_page(); if (ret != 0) { @@ -866,7 +868,7 @@ static int intel_fake_agp_insert_entries(struct agp_memory *mem, if (!mem->is_flushed) global_cache_flush(); - if (intel_private.base.needs_dmar) { + if (intel_private.needs_dmar) { struct sg_table st; ret = intel_gtt_map_memory(mem->pages, mem->page_count, &st); @@ -907,7 +909,7 @@ static int intel_fake_agp_remove_entries(struct agp_memory *mem, intel_gtt_clear_range(pg_start, mem->page_count); - if (intel_private.base.needs_dmar) { + if (intel_private.needs_dmar) { intel_gtt_unmap_memory(mem->sg_list, mem->num_sg); mem->sg_list = NULL; mem->num_sg = 0; diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c index 3c1f66ebc245..a0ba4a9e53c7 100644 --- a/drivers/gpu/drm/i915/i915_gem_gtt.c +++ b/drivers/gpu/drm/i915/i915_gem_gtt.c @@ -138,28 +138,23 @@ int i915_gem_init_aliasing_ppgtt(struct drm_device *dev) goto err_pt_alloc; } - if (dev_priv->mm.gtt->needs_dmar) { - ppgtt->pt_dma_addr = kzalloc(sizeof(dma_addr_t) - *ppgtt->num_pd_entries, - GFP_KERNEL); - if (!ppgtt->pt_dma_addr) - goto err_pt_alloc; + ppgtt->pt_dma_addr = kzalloc(sizeof(dma_addr_t) *ppgtt->num_pd_entries, + GFP_KERNEL); + if (!ppgtt->pt_dma_addr) + goto err_pt_alloc; - for (i = 0; i < ppgtt->num_pd_entries; i++) { - dma_addr_t pt_addr; + for (i = 0; i < ppgtt->num_pd_entries; i++) { + dma_addr_t pt_addr; - pt_addr = pci_map_page(dev->pdev, ppgtt->pt_pages[i], - 0, 4096, - PCI_DMA_BIDIRECTIONAL); + pt_addr = pci_map_page(dev->pdev, ppgtt->pt_pages[i], 0, 4096, + PCI_DMA_BIDIRECTIONAL); - if (pci_dma_mapping_error(dev->pdev, - pt_addr)) { - ret = -EIO; - goto err_pd_pin; + if (pci_dma_mapping_error(dev->pdev, pt_addr)) { + ret = -EIO; + goto err_pd_pin; - } - ppgtt->pt_dma_addr[i] = pt_addr; } + ppgtt->pt_dma_addr[i] = pt_addr; } ppgtt->scratch_page_dma_addr = dev_priv->gtt.scratch_page_dma; @@ -294,11 +289,7 @@ void i915_gem_init_ppgtt(struct drm_device *dev) for (i = 0; i < ppgtt->num_pd_entries; i++) { dma_addr_t pt_addr; - if (dev_priv->mm.gtt->needs_dmar) - pt_addr = ppgtt->pt_dma_addr[i]; - else - pt_addr = page_to_phys(ppgtt->pt_pages[i]); - + pt_addr = ppgtt->pt_dma_addr[i]; pd_entry = GEN6_PDE_ADDR_ENCODE(pt_addr); pd_entry |= GEN6_PDE_VALID; @@ -730,16 +721,12 @@ int i915_gem_gtt_init(struct drm_device *dev) return 0; } - dev_priv->mm.gtt = kzalloc(sizeof(*dev_priv->mm.gtt), GFP_KERNEL); - if (!dev_priv->mm.gtt) - return -ENOMEM; - if (!pci_set_dma_mask(dev->pdev, DMA_BIT_MASK(40))) pci_set_consistent_dma_mask(dev->pdev, DMA_BIT_MASK(40)); -#ifdef CONFIG_INTEL_IOMMU - dev_priv->mm.gtt->needs_dmar = 1; -#endif + dev_priv->mm.gtt = kzalloc(sizeof(*dev_priv->mm.gtt), GFP_KERNEL); + if (!dev_priv->mm.gtt) + return -ENOMEM; /* For GEN6+ the PTEs for the ggtt live at 2MB + BAR0 */ gtt_bus_addr = pci_resource_start(dev->pdev, 0) + (2<<20); diff --git a/include/drm/intel-gtt.h b/include/drm/intel-gtt.h index c787ee4c4c07..984105cddc57 100644 --- a/include/drm/intel-gtt.h +++ b/include/drm/intel-gtt.h @@ -11,8 +11,6 @@ struct intel_gtt { /* Part of the gtt that is mappable by the cpu, for those chips where * this is not the full gtt. */ unsigned int gtt_mappable_entries; - /* Whether i915 needs to use the dmar apis or not. */ - unsigned int needs_dmar : 1; /* needed for ioremap in drm/i915 */ phys_addr_t gma_bus_addr; } *intel_gtt_get(void); -- 2.39.5