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path: root/drivers/char/agp/intel-gtt.c
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Diffstat (limited to 'drivers/char/agp/intel-gtt.c')
-rw-r--r--drivers/char/agp/intel-gtt.c32
1 files changed, 30 insertions, 2 deletions
diff --git a/drivers/char/agp/intel-gtt.c b/drivers/char/agp/intel-gtt.c
index 85151019dde1..66cd0b8096ca 100644
--- a/drivers/char/agp/intel-gtt.c
+++ b/drivers/char/agp/intel-gtt.c
@@ -30,10 +30,10 @@
/*
* If we have Intel graphics, we're not going to have anything other than
* an Intel IOMMU. So make the correct use of the PCI DMA API contingent
- * on the Intel IOMMU support (CONFIG_DMAR).
+ * on the Intel IOMMU support (CONFIG_INTEL_IOMMU).
* Only newer chipsets need to bother with this, of course.
*/
-#ifdef CONFIG_DMAR
+#ifdef CONFIG_INTEL_IOMMU
#define USE_PCI_DMA_API 1
#else
#define USE_PCI_DMA_API 0
@@ -923,6 +923,9 @@ 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.base.stolen_size / PAGE_SIZE;
int end = intel_private.base.gtt_mappable_entries;
@@ -985,6 +988,9 @@ 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.base.needs_dmar) {
@@ -1177,6 +1183,25 @@ static void gen6_cleanup(void)
{
}
+/* Certain Gen5 chipsets require require idling the GPU before
+ * unmapping anything from the GTT when VT-d is enabled.
+ */
+extern int intel_iommu_gfx_mapped;
+static inline int needs_idle_maps(void)
+{
+ 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;
+
+ return 0;
+}
+
static int i9xx_setup(void)
{
u32 reg_addr;
@@ -1211,6 +1236,9 @@ static int i9xx_setup(void)
intel_private.gtt_bus_addr = reg_addr + gtt_offset;
}
+ if (needs_idle_maps());
+ intel_private.base.do_idle_maps = 1;
+
intel_i9xx_setup_flush();
return 0;