[Intel-gfx] [PATCH 2/2] drm/i915: Extend GET_APERTURE ioctl to report size of the stolen region

[ankitprasad.r.sharma at intel.com]

From: Ankitprasad Sharma <ankitprasad.r.sharma at intel.com>

This patch extends the GET_APERTURE ioctl to add support
for getting total size and available size of the stolen region
as well as single largest block available in the stolen region.
Also adds debugfs support to retieve the size information of the
stolen area.

v2: respinned over Rodrigo's patch which extends the GET_APERTURE
too. Used drm_mm to get the size information of the stolen region
(Chris)
Added debugfs support for testing (Ankit)

v3: Rebased to the latest drm-intel-nightly (Ankit)

Signed-off-by: Ankitprasad Sharma <ankitprasad.r.sharma at intel.com>
---
 drivers/gpu/drm/i915/i915_debugfs.c    |  6 +++++
 drivers/gpu/drm/i915/i915_drv.h        |  3 +++
 drivers/gpu/drm/i915/i915_gem.c        |  7 ++++++
 drivers/gpu/drm/i915/i915_gem_stolen.c | 35 +++++++++++++++++++++++++++++
 include/uapi/drm/i915_drm.h            | 40 ++++++++++++++++++++++++++++++++++
 5 files changed, 91 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 49ec438..d12ef0a 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -534,6 +534,12 @@ static int i915_gem_aperture_info(struct seq_file *m, void *data)
 		   arg.fence_available_size);
 	seq_printf(m, "Single largest fence available: %llu bytes\n",
 		   arg.fence_largest_size);
+	seq_printf(m, "Total size of the stolen region: %llu bytes\n",
+		   arg.stolen_total_size);
+	seq_printf(m, "Available size of the stolen region: %llu bytes\n",
+		   arg.stolen_available_size);
+	seq_printf(m, "Single largest area in the stolen region: %llu bytes\n",
+		   arg.stolen_largest_size);
 
 	return 0;
 }
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index ea9caf2..7cd1b2e 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -3101,6 +3101,9 @@ i915_gem_object_create_stolen_for_preallocated(struct drm_device *dev,
 					       u32 stolen_offset,
 					       u32 gtt_offset,
 					       u32 size);
+void i915_gem_stolen_size_info(struct drm_mm *mm, uint64_t *stolen_total,
+			       uint64_t *stolen_free,
+			       uint64_t *stolen_largest);
 
 /* i915_gem_shrinker.c */
 unsigned long i915_gem_shrink(struct drm_i915_private *dev_priv,
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index ccfc8d3..ec20c67 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -203,6 +203,7 @@ i915_gem_get_aperture_ioctl(struct drm_device *dev, void *data,
 	struct list_head map_list;
 	const u32 map_limit = dev_priv->gtt.mappable_end;
 	size_t pinned, map_space, map_largest, fence_space, fence_largest;
+	uint64_t stolen_total, stolen_available, stolen_largest;
 	u32 last, size;
 
 	INIT_LIST_HEAD(&map_list);
@@ -260,6 +261,9 @@ skip_first:
 			fence_largest = size;
 		fence_space += size;
 	}
+
+	i915_gem_stolen_size_info(&dev_priv->mm.stolen, &stolen_total,
+				  &stolen_available, &stolen_largest);
 	mutex_unlock(&dev->struct_mutex);
 
 	args->aper_size = dev_priv->gtt.base.total;
@@ -269,6 +273,9 @@ skip_first:
 	args->map_total_size = dev_priv->gtt.mappable_end;
 	args->fence_available_size = fence_space;
 	args->fence_largest_size = fence_largest;
+	args->stolen_total_size = stolen_total;
+	args->stolen_available_size = stolen_available;
+	args->stolen_largest_size = stolen_largest;
 
 	return 0;
 }
diff --git a/drivers/gpu/drm/i915/i915_gem_stolen.c b/drivers/gpu/drm/i915/i915_gem_stolen.c
index 348ed5a..08d983f 100644
--- a/drivers/gpu/drm/i915/i915_gem_stolen.c
+++ b/drivers/gpu/drm/i915/i915_gem_stolen.c
@@ -551,3 +551,38 @@ err_out:
 	drm_gem_object_unreference(&obj->base);
 	return NULL;
 }
+
+void i915_gem_stolen_size_info(struct drm_mm *mm, uint64_t *stolen_total,
+			       uint64_t *stolen_free,
+			       uint64_t *stolen_largest)
+{
+	struct drm_mm_node *entry;
+	struct drm_mm_node *head_node = &mm->head_node;
+	uint64_t hole_size, hole_start, hole_end, largest_hole = 0;
+	uint64_t total_used = 0, total_free = 0;
+
+	if (head_node->hole_follows) {
+		hole_start = drm_mm_hole_node_start(head_node);
+		hole_end = drm_mm_hole_node_end(head_node);
+		hole_size = hole_end - hole_start;
+		total_free += hole_size;
+		if (largest_hole < hole_size)
+			largest_hole = hole_size;
+	}
+
+	drm_mm_for_each_node(entry, mm) {
+		total_used += entry->size;
+		if (entry->hole_follows) {
+			hole_start = drm_mm_hole_node_start(entry);
+			hole_end = drm_mm_hole_node_end(entry);
+			hole_size = hole_end - hole_start;
+			total_free += hole_size;
+			if (largest_hole < hole_size)
+				largest_hole = hole_size;
+		}
+	}
+
+	*stolen_total = total_free + total_used;
+	*stolen_free = total_free;
+	*stolen_largest = largest_hole;
+}
diff --git a/include/uapi/drm/i915_drm.h b/include/uapi/drm/i915_drm.h
index f88cc1c..9d59fb0 100644
--- a/include/uapi/drm/i915_drm.h
+++ b/include/uapi/drm/i915_drm.h
@@ -922,6 +922,46 @@ struct drm_i915_gem_get_aperture {
 	 * bytes
 	 */
 	__u64 aper_available_size;
+
+	/**
+	 * Total space in the mappable region of the aperture, in bytes
+	 */
+	__u64 map_total_size;
+
+	/**
+	 * Available space in the mappable region of the aperture, in bytes
+	 */
+	__u64 map_available_size;
+
+	/**
+	 * Single largest available region inside the mappable region, in bytes.
+	 */
+	__u64 map_largest_size;
+
+	/**
+	 * Culmulative space available for fences, in bytes
+	 */
+	__u64 fence_available_size;
+
+	/**
+	 * Single largest fenceable region, in bytes.
+	 */
+	__u64 fence_largest_size;
+
+	/**
+	 * Total space in the stolen region, in bytes
+	 */
+	__u64 stolen_total_size;
+
+	/**
+	 * Available space in the stolen region, in bytes
+	 */
+	__u64 stolen_available_size;
+
+	/**
+	 * Single largest block in stolen region, in bytes
+	 */
+	__u64 stolen_largest_size;
 };
 
 struct drm_i915_get_pipe_from_crtc_id {
-- 
1.9.1