[Intel-gfx] [PXP CLEAN PATCH v06 11/27] drm/i915/pxp: Enable ioctl action to set session in play

Sean Z Huang
2020-11-14T00:37:39Z

With this ioctl action, ring3 driver can set the session in state
"session in play", after ring3 reserved the session slot/id from
ring3 PXP, and sent the TEE commands to activate the corresponding
hardware session. Session state "session in play" means this
session is ready for secure playback.

Signed-off-by: Huang, Sean Z <sean.z.huang@intel.com>
---
drivers/gpu/drm/i915/pxp/intel_pxp.c | 4 ++
drivers/gpu/drm/i915/pxp/intel_pxp_sm.c | 92 +++++++++++++++++++++++++
drivers/gpu/drm/i915/pxp/intel_pxp_sm.h | 2 +
3 files changed, 98 insertions(+)

diff --git a/drivers/gpu/drm/i915/pxp/intel_pxp.c b/drivers/gpu/drm/i915/pxp/intel_pxp.c
index 0f684851ecb2..baa61a3a70ff 100644
--- a/drivers/gpu/drm/i915/pxp/intel_pxp.c
+++ b/drivers/gpu/drm/i915/pxp/intel_pxp.c
@@ -61,6 +61,10 @@ int i915_pxp_ops_ioctl(struct drm_device *dev, void *data, struct drm_file *drmf
pxp_info.sm_status = ret;
ret = 0;
}
+ } else if (params->req_session_state == PXP_SM_REQ_SESSION_IN_PLAY) {
+ ret = pxp_sm_mark_protected_session_in_play(i915, params->session_type,
+ params->pxp_tag);
+
} else {
ret = -EINVAL;
goto end;
diff --git a/drivers/gpu/drm/i915/pxp/intel_pxp_sm.c b/drivers/gpu/drm/i915/pxp/intel_pxp_sm.c
index 62303dc197e2..eb77380367aa 100644
--- a/drivers/gpu/drm/i915/pxp/intel_pxp_sm.c
+++ b/drivers/gpu/drm/i915/pxp/intel_pxp_sm.c
@@ -49,6 +49,25 @@ static int pxp_reg_write(struct drm_i915_private *i915, u32 offset, u32 regval)
return err;
}

+static int pxp_get_session_index(struct drm_i915_private *i915, u32 pxp_tag,
+ int *session_index_out, int *session_type_out)
+{
+ int ret;
+
+ if (!session_index_out || !session_type_out) {
+ ret = -EINVAL;
+ drm_dbg(&i915->drm, "Failed to %s, bad params\n", __func__);
+ goto end;
+ }
+
+ *session_type_out = (pxp_tag & SESSION_TYPE_MASK) ? SESSION_TYPE_TYPE1 : SESSION_TYPE_TYPE0;
+ *session_index_out = pxp_tag & SESSION_ID_MASK;
+
+ ret = 0;
+end:
+ return ret;
+}
+
static u8 pxp_get_session_id(int session_index, int session_type)
{
u8 session_id = session_index & SESSION_ID_MASK;
@@ -492,6 +511,79 @@ int intel_pxp_sm_reserve_session(struct drm_i915_private *i915, struct drm_file
return ret;
}

+/**
+ * pxp_sm_mark_protected_session_in_play - To put an reserved protected session to "in_play" state
+ * @i915: i915 device handle.
+ * @session_type: Type of the session to be updated. One of enum pxp_session_types.
+ * @session_id: Session id identifier of the protected session.
+ *
+ * Return: status. 0 means update is successful.
+ */
+int pxp_sm_mark_protected_session_in_play(struct drm_i915_private *i915, int session_type,
+ u32 session_id)
+{
+ int ret;
+ int session_index;
+ int session_type_in_id;
+ struct pxp_protected_session *current_session;
+
+ drm_dbg(&i915->drm, ">>> %s session_type=[%d] session_id=[0x%08x]\n", __func__,
+ session_type, session_id);
+
+ ret = pxp_get_session_index(i915, session_id, &session_index, &session_type_in_id);
+ if (ret) {
+ drm_dbg(&i915->drm, "Failed to pxp_get_session_index\n");
+ goto end;
+ }
+
+ if (session_type != session_type_in_id) {
+ ret = -EINVAL;
+ drm_dbg(&i915->drm, "Failed to session_type and session_type_in_id don't match\n");
+ goto end;
+ }
+
+ lockdep_assert_held(&i915->pxp.r0ctx->ctx_mutex);
+
+ switch (session_type) {
+ case SESSION_TYPE_TYPE0:
+ list_for_each_entry(current_session, &i915->pxp.r0ctx->active_pxp_type0_sessions, session_list) {
+ DRM_DEBUG("Traverse the active type0 list, session_index=[%d]\n", current_session->session_index);
+ drm_dbg(&i915->drm, "Traverse the active type0 list, session_index=[%d]\n", current_session->session_index);
+ if (current_session->session_index == session_index) {
+ current_session->session_is_in_play = true;
+ ret = 0;
+ goto end;
+ }
+ }
+
+ drm_dbg(&i915->drm, "Failed to %s couldn't find active type0 session\n", __func__);
+ ret = -EINVAL;
+ goto end;
+
+ case SESSION_TYPE_TYPE1:
+ list_for_each_entry(current_session, &i915->pxp.r0ctx->active_pxp_type1_sessions, session_list) {
+ drm_dbg(&i915->drm, "Traverse the active type1 list, session_index=[%d]\n", current_session->session_index);
+ if (current_session->session_index == session_index) {
+ current_session->session_is_in_play = true;
+ ret = 0;
+ goto end;
+ }
+ }
+
+ drm_dbg(&i915->drm, "Failed to %s couldn't find active type1 session\n", __func__);
+ ret = -EINVAL;
+ goto end;
+
+ default:
+ /* invalid session type */
+ ret = -EINVAL;
+ break;
+ }
+end:
+ drm_dbg(&i915->drm, "<<< %s ret=[%d]\n", __func__, ret);
+ return ret;
+}
+
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 44d9f8d1df8e..8f3f7e4a742b 100644
--- a/drivers/gpu/drm/i915/pxp/intel_pxp_sm.h
+++ b/drivers/gpu/drm/i915/pxp/intel_pxp_sm.h
@@ -86,6 +86,8 @@ struct pxp_protected_session {
int intel_pxp_sm_reserve_session(struct drm_i915_private *i915, struct drm_file *drmfile,
int context_id, int session_type, int protection_mode,
u32 *pxp_tag);
+int pxp_sm_mark_protected_session_in_play(struct drm_i915_private *i915, int session_type,
+ u32 session_id);
int pxp_sm_set_kcr_init_reg(struct drm_i915_private *i915);

#endif /* __INTEL_PXP_SM_H__ */