[PATCH v2 2/2] drm/msm/gem: Add metadata

[Rob Clark]

From: Rob Clark <robdclark@xxxxxxxxxxxx>

The EXT_external_objects extension is a bit awkward as it doesn't pass
explicit modifiers, leaving the importer to guess with incomplete
information.  In the case of vk (turnip) exporting and gl (freedreno)
importing, the "OPTIMAL_TILING_EXT" layout depends on VkImageCreateInfo
flags (among other things), which the importer does not know.  Which
unfortunately leaves us with the need for a metadata back-channel.

The contents of the metadata are defined by userspace.  The
EXT_external_objects extension is only required to work between
compatible versions of gl and vk drivers, as defined by device and
driver UUIDs.

v2: add missing metadata kfree

Signed-off-by: Rob Clark <robdclark@xxxxxxxxxxxx>
---
 drivers/gpu/drm/msm/msm_drv.c | 57 ++++++++++++++++++++++++++++++++++-
 drivers/gpu/drm/msm/msm_gem.c |  1 +
 drivers/gpu/drm/msm/msm_gem.h |  4 +++
 include/uapi/drm/msm_drm.h    |  2 ++
 4 files changed, 63 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/msm/msm_drv.c b/drivers/gpu/drm/msm/msm_drv.c
index 781db689fb16..9ec74ab4cfea 100644
--- a/drivers/gpu/drm/msm/msm_drv.c
+++ b/drivers/gpu/drm/msm/msm_drv.c
@@ -49,9 +49,10 @@
  * - 1.9.0 - Add MSM_SUBMIT_FENCE_SN_IN
  * - 1.10.0 - Add MSM_SUBMIT_BO_NO_IMPLICIT
  * - 1.11.0 - Add wait boost (MSM_WAIT_FENCE_BOOST, MSM_PREP_BOOST)
+ * - 1.12.0 - Add MSM_INFO_SET_METADATA and MSM_INFO_GET_METADATA
  */
 #define MSM_VERSION_MAJOR	1
-#define MSM_VERSION_MINOR	11
+#define MSM_VERSION_MINOR	12
 #define MSM_VERSION_PATCHLEVEL	0
 
 static void msm_deinit_vram(struct drm_device *ddev);
@@ -844,6 +845,8 @@ static int msm_ioctl_gem_info(struct drm_device *dev, void *data,
 		break;
 	case MSM_INFO_SET_NAME:
 	case MSM_INFO_GET_NAME:
+	case MSM_INFO_SET_METADATA:
+	case MSM_INFO_GET_METADATA:
 		break;
 	default:
 		return -EINVAL;
@@ -905,6 +908,58 @@ static int msm_ioctl_gem_info(struct drm_device *dev, void *data,
 					 msm_obj->name, args->len))
 				ret = -EFAULT;
 		}
+		break;
+	case MSM_INFO_SET_METADATA:
+		/* Impose a moderate upper bound on metadata size: */
+		if (args->len > 128) {
+			ret = -EOVERFLOW;
+			break;
+		}
+
+		ret = msm_gem_lock_interruptible(obj);
+		if (ret)
+			break;
+
+		msm_obj->metadata =
+			krealloc(msm_obj->metadata, args->len, GFP_KERNEL);
+		msm_obj->metadata_size = args->len;
+
+		if (copy_from_user(msm_obj->metadata, u64_to_user_ptr(args->value),
+				   args->len)) {
+			msm_obj->metadata_size = 0;
+			ret = -EFAULT;
+		}
+
+		msm_gem_unlock(obj);
+
+		break;
+	case MSM_INFO_GET_METADATA:
+		if (!args->value) {
+			/*
+			 * Querying the size is inherently racey, but
+			 * EXT_external_objects expects the app to confirm
+			 * via device and driver UUIDs that the exporter and
+			 * importer versions match.  All we can do from the
+			 * kernel side is check the length under obj lock
+			 * when userspace tries to retrieve the metadata
+			 */
+			args->len = msm_obj->metadata_size;
+			break;
+		}
+
+		ret = msm_gem_lock_interruptible(obj);
+		if (ret)
+			break;
+
+		if (args->len < msm_obj->metadata_size) {
+			ret = -ETOOSMALL;
+		} else if (copy_to_user(u64_to_user_ptr(args->value),
+					msm_obj->metadata, args->len)) {
+			ret = -EFAULT;
+		}
+
+		msm_gem_unlock(obj);
+
 		break;
 	}
 
diff --git a/drivers/gpu/drm/msm/msm_gem.c b/drivers/gpu/drm/msm/msm_gem.c
index 1113e6b2ec8e..175ee4ab8a6f 100644
--- a/drivers/gpu/drm/msm/msm_gem.c
+++ b/drivers/gpu/drm/msm/msm_gem.c
@@ -1058,6 +1058,7 @@ static void msm_gem_free_object(struct drm_gem_object *obj)
 
 	drm_gem_object_release(obj);
 
+	kfree(msm_obj->metadata);
 	kfree(msm_obj);
 }
 
diff --git a/drivers/gpu/drm/msm/msm_gem.h b/drivers/gpu/drm/msm/msm_gem.h
index 7f34263048a3..8d414b072c29 100644
--- a/drivers/gpu/drm/msm/msm_gem.h
+++ b/drivers/gpu/drm/msm/msm_gem.h
@@ -109,6 +109,10 @@ struct msm_gem_object {
 
 	char name[32]; /* Identifier to print for the debugfs files */
 
+	/* userspace metadata backchannel */
+	void *metadata;
+	u32 metadata_size;
+
 	/**
 	 * pin_count: Number of times the pages are pinned
 	 *
diff --git a/include/uapi/drm/msm_drm.h b/include/uapi/drm/msm_drm.h
index 6c34272a13fd..6f2a7ad04aa4 100644
--- a/include/uapi/drm/msm_drm.h
+++ b/include/uapi/drm/msm_drm.h
@@ -139,6 +139,8 @@ struct drm_msm_gem_new {
 #define MSM_INFO_GET_NAME	0x03   /* get debug name, returned by pointer */
 #define MSM_INFO_SET_IOVA	0x04   /* set the iova, passed by value */
 #define MSM_INFO_GET_FLAGS	0x05   /* get the MSM_BO_x flags */
+#define MSM_INFO_SET_METADATA	0x06   /* set userspace metadata */
+#define MSM_INFO_GET_METADATA	0x07   /* get userspace metadata */
 
 struct drm_msm_gem_info {
 	__u32 handle;         /* in */
-- 
2.41.0