[Intel-gfx] [PATCH 11/13] drm/i915: Cut out the infamous ILK w/a from AGP layer

[Ben Widawsky]

And, move it to where the rest of the logic is.

There is some slight functionality changes. There was extra paranoid
checks in AGP code making sure we never do idle maps on gen2 parts. That
was not duplicated as the simple PCI id check should do the right thing.

v2: use IS_GEN5 && IS_MOBILE check instead. For now, this is the same as
IS_IRONLAKE_M but is more future proof. The workaround docs hint that
more than one platform may be effected, but we've never seen such a
platform in the wild. (Rodrigo, Daniel)

Reviewed-by: Rodrigo Vivi <rodrigo.vivi at gmail.com> (v1)
Cc: Dave Airlie <airlied at redhat.com>
Signed-off-by: Ben Widawsky <ben at bwidawsk.net>
---
 drivers/char/agp/intel-gtt.c        | 27 ---------------------------
 drivers/gpu/drm/i915/i915_drv.h     |  1 +
 drivers/gpu/drm/i915/i915_gem_gtt.c | 24 +++++++++++++++++++++---
 include/drm/intel-gtt.h             |  2 --
 4 files changed, 22 insertions(+), 32 deletions(-)

diff --git a/drivers/char/agp/intel-gtt.c b/drivers/char/agp/intel-gtt.c
index a531377..f54ddc0 100644
--- a/drivers/char/agp/intel-gtt.c
+++ b/drivers/char/agp/intel-gtt.c
@@ -849,9 +849,6 @@ static int intel_fake_agp_insert_entries(struct agp_memory *mem,
 {
 	int ret = -EINVAL;
 
-	if (intel_private.base.do_idle_maps)
-		return -ENODEV;
-
 	if (intel_private.clear_fake_agp) {
 		int start = intel_private.stolen_size / PAGE_SIZE;
 		int end = intel_private.gtt_mappable_entries;
@@ -916,9 +913,6 @@ static int intel_fake_agp_remove_entries(struct agp_memory *mem,
 	if (mem->page_count == 0)
 		return 0;
 
-	if (intel_private.base.do_idle_maps)
-		return -ENODEV;
-
 	intel_gtt_clear_range(pg_start, mem->page_count);
 
 	if (intel_private.needs_dmar) {
@@ -1078,24 +1072,6 @@ static void i965_write_entry(dma_addr_t addr,
 	writel(addr | pte_flags, intel_private.gtt + entry);
 }
 
-/* Certain Gen5 chipsets require require idling the GPU before
- * unmapping anything from the GTT when VT-d is enabled.
- */
-static inline int needs_idle_maps(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 int i9xx_setup(void)
 {
@@ -1124,9 +1100,6 @@ static int i9xx_setup(void)
 		break;
 	}
 
-	if (needs_idle_maps())
-		intel_private.base.do_idle_maps = 1;
-
 	intel_i9xx_setup_flush();
 
 	return 0;
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 28f2cc8..2083e91 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -388,6 +388,7 @@ struct i915_gtt {
 	/** "Graphics Stolen Memory" holds the global PTEs */
 	void __iomem *gsm;
 
+	bool do_idle_maps;
 };
 #define gtt_total_entries(gtt) ((gtt).total >> PAGE_SHIFT)
 
diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
index ae96835..38af3c4 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
@@ -330,11 +330,27 @@ void i915_gem_init_ppgtt(struct drm_device *dev)
 	}
 }
 
+extern int intel_iommu_gfx_mapped;
+/* Certain Gen5 chipsets require require idling the GPU before
+ * unmapping anything from the GTT when VT-d is enabled.
+ */
+static inline bool needs_idle_maps(struct drm_device *dev)
+{
+#ifdef CONFIG_INTEL_IOMMU
+	/* Query intel_iommu to see if we need the workaround. Presumably that
+	 * was loaded first.
+	 */
+	if (IS_GEN5(dev) && IS_MOBILE(dev) && intel_iommu_gfx_mapped)
+		return true;
+#endif
+	return false;
+}
+
 static bool do_idling(struct drm_i915_private *dev_priv)
 {
 	bool ret = dev_priv->mm.interruptible;
 
-	if (unlikely(dev_priv->mm.gtt->do_idle_maps)) {
+	if (unlikely(dev_priv->gtt.do_idle_maps)) {
 		dev_priv->mm.interruptible = false;
 		if (i915_gpu_idle(dev_priv->dev)) {
 			DRM_ERROR("Couldn't idle GPU\n");
@@ -348,11 +364,10 @@ static bool do_idling(struct drm_i915_private *dev_priv)
 
 static void undo_idling(struct drm_i915_private *dev_priv, bool interruptible)
 {
-	if (unlikely(dev_priv->mm.gtt->do_idle_maps))
+	if (unlikely(dev_priv->gtt.do_idle_maps))
 		dev_priv->mm.interruptible = interruptible;
 }
 
-
 static void i915_ggtt_clear_range(struct drm_device *dev,
 				 unsigned first_entry,
 				 unsigned num_entries)
@@ -710,6 +725,9 @@ int i915_gem_gtt_init(struct drm_device *dev)
 			intel_gmch_remove();
 			return -ENODEV;
 		}
+
+		dev_priv->gtt.do_idle_maps = needs_idle_maps(dev);
+
 		return 0;
 	}
 
diff --git a/include/drm/intel-gtt.h b/include/drm/intel-gtt.h
index 63157c5..db2785e 100644
--- a/include/drm/intel-gtt.h
+++ b/include/drm/intel-gtt.h
@@ -4,8 +4,6 @@
 #define	_DRM_INTEL_GTT_H
 
 struct intel_gtt {
-	/* Whether we idle the gpu before mapping/unmapping */
-	unsigned int do_idle_maps : 1;
 	/* Share the scratch page dma with ppgtts. */
 	dma_addr_t scratch_page_dma;
 	struct page *scratch_page;
-- 
1.8.1.1