[Intel-xe] [PATCH 1/2] drm/xe/dgfx: Block rpm for active mmap mappings

[Badal Nilawar <badal.nilawar@intel.com>]

Block rpm for discrete cards when mmap mappings are active.
Ideally rpm wake ref should be taken in vm_open call and put in vm_close
call but it is seen that vm_open doesn't get called for xe_gem_vm_ops.
Therefore rpm wake ref is being get in xe_drm_gem_ttm_mmap and put
in vm_close.

Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Anshuman Gupta <anshuman.gupta@intel.com>
Signed-off-by: Badal Nilawar <badal.nilawar@intel.com>
---
 drivers/gpu/drm/xe/xe_bo.c | 35 +++++++++++++++++++++++++++++++++--
 1 file changed, 33 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/xe/xe_bo.c b/drivers/gpu/drm/xe/xe_bo.c
index 72dc4a4eed4e..5741948a2a51 100644
--- a/drivers/gpu/drm/xe/xe_bo.c
+++ b/drivers/gpu/drm/xe/xe_bo.c
@@ -15,6 +15,7 @@
 #include <drm/ttm/ttm_tt.h>
 #include <drm/xe_drm.h>
 
+#include "i915_drv.h"
 #include "xe_device.h"
 #include "xe_dma_buf.h"
 #include "xe_drm_client.h"
@@ -1158,17 +1159,47 @@ static vm_fault_t xe_gem_fault(struct vm_fault *vmf)
 	return ret;
 }
 
+static void xe_ttm_bo_vm_close(struct vm_area_struct *vma)
+{
+	struct ttm_buffer_object *tbo = vma->vm_private_data;
+	struct drm_device *ddev = tbo->base.dev;
+	struct xe_device *xe = to_xe_device(ddev);
+
+	ttm_bo_vm_close(vma);
+
+	if (tbo->resource->bus.is_iomem)
+		xe_device_mem_access_put(xe);
+}
+
 static const struct vm_operations_struct xe_gem_vm_ops = {
 	.fault = xe_gem_fault,
 	.open = ttm_bo_vm_open,
-	.close = ttm_bo_vm_close,
+	.close = xe_ttm_bo_vm_close,
 	.access = ttm_bo_vm_access
 };
 
+int xe_drm_gem_ttm_mmap(struct drm_gem_object *gem,
+			struct vm_area_struct *vma)
+{
+	struct ttm_buffer_object *tbo = drm_gem_ttm_of_gem(gem);
+	struct drm_device *ddev = tbo->base.dev;
+	struct xe_device *xe = to_xe_device(ddev);
+	int ret;
+
+	ret = drm_gem_ttm_mmap(gem, vma);
+	if (ret < 0)
+		return ret;
+
+	if (tbo->resource->bus.is_iomem)
+		xe_device_mem_access_get(xe);
+
+	return 0;
+}
+
 static const struct drm_gem_object_funcs xe_gem_object_funcs = {
 	.free = xe_gem_object_free,
 	.close = xe_gem_object_close,
-	.mmap = drm_gem_ttm_mmap,
+	.mmap = xe_drm_gem_ttm_mmap,
 	.export = xe_gem_prime_export,
 	.vm_ops = &xe_gem_vm_ops,
 };
-- 
2.25.1