drm/nouveau/platform: probe IOMMU if present
Tegra SoCs have an IOMMU that can be used to present non-contiguous
physical memory as contiguous to the GPU and maximize the use of large
pages in the GPU MMU, leading to performance gains. This patch adds
support for probing such a IOMMU if present and make its properties
available in the nouveau_platform_gpu structure so subsystems can take
advantage of it.
Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
diff --git a/drivers/gpu/drm/nouveau/nouveau_platform.h b/drivers/gpu/drm/nouveau/nouveau_platform.h
index 268bb72..392874c 100644
--- a/drivers/gpu/drm/nouveau/nouveau_platform.h
+++ b/drivers/gpu/drm/nouveau/nouveau_platform.h
@@ -24,10 +24,12 @@
#define __NOUVEAU_PLATFORM_H__
#include "core/device.h"
+#include "core/mm.h"
struct reset_control;
struct clk;
struct regulator;
+struct iommu_domain;
struct platform_driver;
struct nouveau_platform_gpu {
@@ -36,6 +38,22 @@
struct clk *clk_pwr;
struct regulator *vdd;
+
+ struct {
+ /*
+ * Protects accesses to mm from subsystems
+ */
+ struct mutex mutex;
+
+ struct nvkm_mm _mm;
+ /*
+ * Just points to _mm. We need this to avoid embedding
+ * struct nvkm_mm in os.h
+ */
+ struct nvkm_mm *mm;
+ struct iommu_domain *domain;
+ unsigned long pgshift;
+ } iommu;
};
struct nouveau_platform_device {