[Intel-gfx] [RFC-v4 08/26] drm/i915/pxp: Implement funcs to get/set PXP tag

[Huang, Sean Z]

Implement the functions to get/set the PXP tag, which is 32-bit
bitwise value containing the hardware session info, such as its
session id, protection mode or whether it's enabled.

Signed-off-by: Huang, Sean Z <sean.z.huang at intel.com>
---
 drivers/gpu/drm/i915/pxp/intel_pxp_sm.c | 95 +++++++++++++++++++++++++
 drivers/gpu/drm/i915/pxp/intel_pxp_sm.h | 18 +++++
 2 files changed, 113 insertions(+)

diff --git a/drivers/gpu/drm/i915/pxp/intel_pxp_sm.c b/drivers/gpu/drm/i915/pxp/intel_pxp_sm.c
index 6413f401d939..469810390c9b 100644
--- a/drivers/gpu/drm/i915/pxp/intel_pxp_sm.c
+++ b/drivers/gpu/drm/i915/pxp/intel_pxp_sm.c
@@ -41,6 +41,16 @@ static int pxp_reg_write(struct drm_i915_private *i915, u32 offset, u32 regval)
 	return 0;
 }
 
+static u8 pxp_get_session_id(int session_index, int session_type)
+{
+	u8 session_id = session_index & SESSION_ID_MASK;
+
+	if (session_type == SESSION_TYPE_TYPE1)
+		session_id |= SESSION_TYPE_MASK;
+
+	return session_id;
+}
+
 /**
  * is_sw_session_active - Check if the given sw session id is active.
  * @i915: i915 device handle.
@@ -78,6 +88,91 @@ static bool is_sw_session_active(struct drm_i915_private *i915, int session_type
 	return false;
 }
 
+static int pxp_set_pxp_tag(struct drm_i915_private *i915, int session_type,
+			   int session_idx, int protection_mode)
+{
+	struct pxp_tag *pxp_tag;
+
+	if (!i915 || session_type >= SESSION_TYPE_MAX)
+		return -EINVAL;
+
+	if (session_type == SESSION_TYPE_TYPE0 && session_idx < MAX_TYPE0_SESSIONS) {
+		pxp_tag = (struct pxp_tag *)&i915->pxp.ctx->type0_session_pxp_tag[session_idx];
+	} else if (session_type == SESSION_TYPE_TYPE1 && session_idx < MAX_TYPE1_SESSIONS) {
+		pxp_tag = (struct pxp_tag *)&i915->pxp.ctx->type1_session_pxp_tag[session_idx];
+	} else {
+		drm_err(&i915->drm, "Failed to %s, bad params session_type=[%d], session_idx=[%d]\n",
+			__func__, session_type, session_idx);
+		return -EINVAL;
+	}
+
+	switch (protection_mode) {
+	case PROTECTION_MODE_NONE:
+	{
+		pxp_tag->enable = false;
+		pxp_tag->hm = false;
+		pxp_tag->sm = false;
+		break;
+	}
+	case PROTECTION_MODE_LM:
+	{
+		pxp_tag->enable = true;
+		pxp_tag->hm = false;
+		pxp_tag->sm = false;
+		pxp_tag->instance_id++;
+		break;
+	}
+	case PROTECTION_MODE_HM:
+	{
+		pxp_tag->enable = true;
+		pxp_tag->hm = true;
+		pxp_tag->sm = false;
+		pxp_tag->instance_id++;
+		break;
+	}
+	case PROTECTION_MODE_SM:
+	{
+		pxp_tag->enable = true;
+		pxp_tag->hm = true;
+		pxp_tag->sm = true;
+		pxp_tag->instance_id++;
+		break;
+	}
+	default:
+		drm_err(&i915->drm, "Failed to %s, bad params protection_mode=[%d]\n",
+			__func__, protection_mode);
+		return -EINVAL;
+	}
+
+	pxp_tag->session_id = pxp_get_session_id(session_idx, session_type);
+end:
+	return 0;
+}
+
+u32 intel_pxp_get_pxp_tag(struct drm_i915_private *i915, int session_idx,
+			  int session_type, u32 *session_is_alive)
+{
+	struct pxp_tag *pxp_tag;
+
+	if (!i915 || session_type >= SESSION_TYPE_MAX)
+		return -EINVAL;
+
+	if (session_type == SESSION_TYPE_TYPE0 && session_idx < MAX_TYPE0_SESSIONS) {
+		pxp_tag = (struct pxp_tag *)&i915->pxp.ctx->type0_session_pxp_tag[session_idx];
+	} else if (session_type == SESSION_TYPE_TYPE1 && session_idx < MAX_TYPE1_SESSIONS) {
+		pxp_tag = (struct pxp_tag *)&i915->pxp.ctx->type1_session_pxp_tag[session_idx];
+	} else {
+		drm_err(&i915->drm, "Failed to %s, bad params session_type=[%d], session_idx=[%d]\n",
+			__func__, session_type, session_idx);
+		return -EINVAL;
+	}
+
+	if (session_is_alive)
+		*session_is_alive = pxp_tag->enable;
+
+	return pxp_tag->value;
+}
+
 static bool is_hw_type0_session_in_play(struct drm_i915_private *i915, int session_index)
 {
 	u32 regval_sip = 0;
diff --git a/drivers/gpu/drm/i915/pxp/intel_pxp_sm.h b/drivers/gpu/drm/i915/pxp/intel_pxp_sm.h
index 222a879be96d..b5012948f971 100644
--- a/drivers/gpu/drm/i915/pxp/intel_pxp_sm.h
+++ b/drivers/gpu/drm/i915/pxp/intel_pxp_sm.h
@@ -20,6 +20,9 @@
 #define GEN12_KCR_TSIP_LOW  _MMIO(0x32264)   /* KCR type1 session in play 0-31 */
 #define GEN12_KCR_TSIP_HIGH _MMIO(0x32268)   /* KCR type1 session in play 32-63 */
 
+#define SESSION_TYPE_MASK BIT(7)
+#define SESSION_ID_MASK (BIT(7) - 1)
+
 enum pxp_session_types {
 	SESSION_TYPE_TYPE0 = 0,
 	SESSION_TYPE_TYPE1 = 1,
@@ -36,6 +39,21 @@ enum pxp_protection_modes {
 	PROTECTION_MODE_ALL
 };
 
+struct pxp_tag {
+	union {
+		u32 value;
+		struct {
+			u32 session_id  : 8;
+			u32 instance_id : 8;
+			u32 enable      : 1;
+			u32 hm          : 1;
+			u32 reserved_1  : 1;
+			u32 sm          : 1;
+			u32 reserved_2  : 12;
+		};
+	};
+};
+
 /**
  * struct pxp_protected_session - linked list to track all active sessions.
  */
-- 
2.17.1