[RFC-v4 13/26] drm/i915/pxp: Enable ioctl action to query PXP tag

["Huang, Sean Z" <sean.z.huang@xxxxxxxxx>]

Enable the PXP ioctl action to allow user space driver to query the
PXP tag, which is a 32-bit bitwise value indicating the current
session info, including protection type, session id, and whether
the session is enabled.

Signed-off-by: Huang, Sean Z <sean.z.huang@xxxxxxxxx>
---
 drivers/gpu/drm/i915/pxp/intel_pxp.c    |  7 +++++++
 drivers/gpu/drm/i915/pxp/intel_pxp.h    |  7 +++++++
 drivers/gpu/drm/i915/pxp/intel_pxp_sm.c | 20 ++++++++++++++++++++
 drivers/gpu/drm/i915/pxp/intel_pxp_sm.h |  3 +++
 4 files changed, 37 insertions(+)

diff --git a/drivers/gpu/drm/i915/pxp/intel_pxp.c b/drivers/gpu/drm/i915/pxp/intel_pxp.c
index 3856e1060d11..969f3fdf0804 100644
--- a/drivers/gpu/drm/i915/pxp/intel_pxp.c
+++ b/drivers/gpu/drm/i915/pxp/intel_pxp.c
@@ -70,6 +70,13 @@ int i915_pxp_ops_ioctl(struct drm_device *dev, void *data, struct drm_file *drmf
 		}
 		break;
 	}
+	case PXP_ACTION_QUERY_PXP_TAG:
+	{
+		struct pxp_sm_query_pxp_tag *params = &pxp_info.query_pxp_tag;
+
+		ret = pxp_sm_ioctl_query_pxp_tag(i915, &params->session_is_alive, &params->pxp_tag);
+		break;
+	}
 	case PXP_ACTION_SET_USER_CONTEXT:
 	{
 		ret = intel_pxp_set_user_ctx(i915, pxp_info.set_user_ctx);
diff --git a/drivers/gpu/drm/i915/pxp/intel_pxp.h b/drivers/gpu/drm/i915/pxp/intel_pxp.h
index ed77630bb7c4..9ba17c620ea2 100644
--- a/drivers/gpu/drm/i915/pxp/intel_pxp.h
+++ b/drivers/gpu/drm/i915/pxp/intel_pxp.h
@@ -31,6 +31,7 @@ enum pxp_sm_session_req {
 };
 
 enum pxp_ioctl_action {
+	PXP_ACTION_QUERY_PXP_TAG = 0,
 	PXP_ACTION_SET_SESSION_STATUS = 1,
 	PXP_ACTION_SET_USER_CONTEXT = 5,
 };
@@ -42,6 +43,11 @@ enum pxp_sm_status {
 	PXP_SM_STATUS_ERROR_UNKNOWN
 };
 
+struct pxp_sm_query_pxp_tag {
+	u32 session_is_alive;
+	u32 pxp_tag; /* in  - Session ID, out pxp tag */
+};
+
 struct pxp_sm_set_session_status_params {
 	/** @pxp_tag: in [optional], for Arbitrator session, out pxp tag */
 	u32 pxp_tag;
@@ -57,6 +63,7 @@ struct pxp_info {
 	u32 action;
 	u32 sm_status;
 	union {
+		struct pxp_sm_query_pxp_tag             query_pxp_tag;
 		struct pxp_sm_set_session_status_params set_session_status;
 		u32 set_user_ctx;
 	};
diff --git a/drivers/gpu/drm/i915/pxp/intel_pxp_sm.c b/drivers/gpu/drm/i915/pxp/intel_pxp_sm.c
index 65b89728251d..fdfb366d7472 100644
--- a/drivers/gpu/drm/i915/pxp/intel_pxp_sm.c
+++ b/drivers/gpu/drm/i915/pxp/intel_pxp_sm.c
@@ -970,6 +970,26 @@ int pxp_sm_terminate_protected_session_unsafe(struct drm_i915_private *i915, int
 	return ret;
 }
 
+int pxp_sm_ioctl_query_pxp_tag(struct drm_i915_private *i915, u32 *session_is_alive, u32 *pxp_tag)
+{
+	int session_type = 0;
+	int session_index = 0;
+	int ret;
+
+	if (!session_is_alive || !pxp_tag)
+		return -EINVAL;
+
+	ret = pxp_get_session_index(i915, *pxp_tag, &session_index, &session_type);
+	if (ret) {
+		drm_err(&i915->drm, "Failed to __pxpsessionid_to_sessionid\n");
+		return ret;
+	}
+
+	*pxp_tag = intel_pxp_get_pxp_tag(i915, session_index, session_type, session_is_alive);
+end:
+	return 0;
+}
+
 int pxp_sm_set_kcr_init_reg(struct drm_i915_private *i915)
 {
 	int ret;
diff --git a/drivers/gpu/drm/i915/pxp/intel_pxp_sm.h b/drivers/gpu/drm/i915/pxp/intel_pxp_sm.h
index a68e1d109437..7ae001ccb60f 100644
--- a/drivers/gpu/drm/i915/pxp/intel_pxp_sm.h
+++ b/drivers/gpu/drm/i915/pxp/intel_pxp_sm.h
@@ -109,7 +109,10 @@ int pxp_sm_terminate_protected_session_safe(struct drm_i915_private *i915, int c
 					    int session_type, int session_id);
 int pxp_sm_terminate_protected_session_unsafe(struct drm_i915_private *i915, int session_type,
 					      int session_id);
+int pxp_sm_ioctl_query_pxp_tag(struct drm_i915_private *i915, u32 *session_is_alive, u32 *pxp_tag);
 int pxp_sm_set_kcr_init_reg(struct drm_i915_private *i915);
+u32 intel_pxp_get_pxp_tag(struct drm_i915_private *i915, int session_idx,
+			  int session_type, u32 *session_is_alive);
 bool intel_pxp_sm_is_any_type0_session_in_play(struct drm_i915_private *i915, int protection_mode);
 
 #endif /* __INTEL_PXP_SM_H__ */
-- 
2.17.1

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