[Intel-gfx] [PATCH 16/27] drm/i915/pxp: Termiante the session upon app crash

[Huang, Sean Z]

Ring0 PXP should terminate the hardware session and cleanup the
software state gracefully when the application has established
the protection session, but doesn't close the session correctly
due to some cases like application crash.

Signed-off-by: Huang, Sean Z <sean.z.huang at intel.com>
---
 drivers/gpu/drm/i915/i915_drv.c         |  2 ++
 drivers/gpu/drm/i915/pxp/intel_pxp.c    | 15 +++++++++++++++
 drivers/gpu/drm/i915/pxp/intel_pxp.h    |  1 +
 drivers/gpu/drm/i915/pxp/intel_pxp_sm.c | 21 +++++++++++++++++++++
 drivers/gpu/drm/i915/pxp/intel_pxp_sm.h |  1 +
 5 files changed, 40 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index 43ea85b5f14b..e61ffce52e3e 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -1028,6 +1028,8 @@ static void i915_driver_postclose(struct drm_device *dev, struct drm_file *file)
 
 	/* Catch up with all the deferred frees from "this" client */
 	i915_gem_flush_free_objects(to_i915(dev));
+
+	intel_pxp_close(to_i915(dev), file);
 }
 
 static void intel_suspend_encoders(struct drm_i915_private *dev_priv)
diff --git a/drivers/gpu/drm/i915/pxp/intel_pxp.c b/drivers/gpu/drm/i915/pxp/intel_pxp.c
index c9b6ac42b215..50968373c68e 100644
--- a/drivers/gpu/drm/i915/pxp/intel_pxp.c
+++ b/drivers/gpu/drm/i915/pxp/intel_pxp.c
@@ -103,6 +103,21 @@ int i915_pxp_ops_ioctl(struct drm_device *dev, void *data, struct drm_file *drmf
 	return ret;
 }
 
+int intel_pxp_close(struct drm_i915_private *i915, struct drm_file *drmfile)
+{
+	int ret;
+
+	drm_dbg(&i915->drm, ">>> %s i915=[%p] drmfile=[%p] pid=[%d]\n", __func__,
+		i915, drmfile, pid_nr(drmfile->pid));
+
+	mutex_lock(&i915->pxp.r0ctx->ctx_mutex);
+	ret = intel_pxp_sm_close(i915, drmfile);
+	mutex_unlock(&i915->pxp.r0ctx->ctx_mutex);
+
+	drm_dbg(&i915->drm, "<<< %s ret=[%d]\n", __func__, ret);
+	return ret;
+}
+
 static void intel_pxp_write_irq_mask_reg(struct drm_i915_private *i915, u32 mask)
 {
 	WARN_ON(INTEL_GEN(i915) < 11);
diff --git a/drivers/gpu/drm/i915/pxp/intel_pxp.h b/drivers/gpu/drm/i915/pxp/intel_pxp.h
index 8851c28a0e57..3d70b9bab79f 100644
--- a/drivers/gpu/drm/i915/pxp/intel_pxp.h
+++ b/drivers/gpu/drm/i915/pxp/intel_pxp.h
@@ -83,6 +83,7 @@ struct intel_gt;
 struct drm_i915_private;
 
 int i915_pxp_ops_ioctl(struct drm_device *dev, void *data, struct drm_file *drmfile);
+int intel_pxp_close(struct drm_i915_private *i915, struct drm_file *drmfile);
 void intel_pxp_irq_handler(struct intel_gt *gt, u16 iir);
 int i915_pxp_teardown_required_callback(struct drm_i915_private *i915);
 int i915_pxp_global_terminate_complete_callback(struct drm_i915_private *i915);
diff --git a/drivers/gpu/drm/i915/pxp/intel_pxp_sm.c b/drivers/gpu/drm/i915/pxp/intel_pxp_sm.c
index 89c32b06c52e..ec28eb5d77e5 100644
--- a/drivers/gpu/drm/i915/pxp/intel_pxp_sm.c
+++ b/drivers/gpu/drm/i915/pxp/intel_pxp_sm.c
@@ -1243,3 +1243,24 @@ bool intel_pxp_sm_is_any_type0_session_in_play(struct drm_i915_private *i915, in
 
 	return false;
 }
+
+int intel_pxp_sm_close(struct drm_i915_private *i915, struct drm_file *drmfile)
+{
+	struct pxp_protected_session *s, *n;
+	int ret = 0;
+
+	drm_dbg(&i915->drm, ">>> %s\n", __func__);
+
+	list_for_each_entry_safe(s, n, pxp_session_list(i915, SESSION_TYPE_TYPE0), session_list) {
+		if (s->drmfile && s->drmfile == drmfile && s->pid == pid_nr(drmfile->pid)) {
+			ret = terminate_protected_session(i915, 0, s->session_type, s->session_index, false);
+			if (ret) {
+				drm_dbg(&i915->drm, "Failed to terminate_protected_session()\n");
+				return ret;
+			}
+		}
+	}
+
+	drm_dbg(&i915->drm, "<<< %s ret=[%d]\n", __func__, ret);
+	return ret;
+}
diff --git a/drivers/gpu/drm/i915/pxp/intel_pxp_sm.h b/drivers/gpu/drm/i915/pxp/intel_pxp_sm.h
index 955182a90bfe..b968a3169133 100644
--- a/drivers/gpu/drm/i915/pxp/intel_pxp_sm.h
+++ b/drivers/gpu/drm/i915/pxp/intel_pxp_sm.h
@@ -114,5 +114,6 @@ 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);
+int intel_pxp_sm_close(struct drm_i915_private *i915, struct drm_file *drmfile);
 
 #endif /* __INTEL_PXP_SM_H__ */
-- 
2.17.1