[PATCH v2 06/12] drm/xe/pxp: Add GSC session initialization support

[Daniele Ceraolo Spurio]

A session is initialized (i.e. started) by sending a message to the GSC.

Note that this patch is meant to be squashed with the follow-up patches
that implement the other pieces of the session initialization and queue
setup flow. It is separate for now for ease of review.

Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio at intel.com>
---
 drivers/gpu/drm/xe/abi/gsc_pxp_commands_abi.h | 21 ++++++++
 drivers/gpu/drm/xe/xe_pxp_submit.c            | 50 +++++++++++++++++++
 drivers/gpu/drm/xe/xe_pxp_submit.h            |  1 +
 3 files changed, 72 insertions(+)

diff --git a/drivers/gpu/drm/xe/abi/gsc_pxp_commands_abi.h b/drivers/gpu/drm/xe/abi/gsc_pxp_commands_abi.h
index 4a59c564a0d0..734feb38f570 100644
--- a/drivers/gpu/drm/xe/abi/gsc_pxp_commands_abi.h
+++ b/drivers/gpu/drm/xe/abi/gsc_pxp_commands_abi.h
@@ -50,6 +50,7 @@ struct pxp_cmd_header {
 } __packed;
 
 #define PXP43_CMDID_INVALIDATE_STREAM_KEY 0x00000007
+#define PXP43_CMDID_INIT_SESSION 0x00000036
 #define PXP43_CMDID_NEW_HUC_AUTH 0x0000003F /* MTL+ */
 
 /* PXP-Input-Packet: HUC Auth-only */
@@ -64,6 +65,26 @@ struct pxp43_huc_auth_out {
 	struct pxp_cmd_header header;
 } __packed;
 
+/* PXP-Input-Packet: Init PXP session */
+struct pxp43_create_arb_in {
+	struct pxp_cmd_header header;
+		/* header.stream_id fields for vesion 4.3 of Init PXP session: */
+		#define PXP43_INIT_SESSION_VALID BIT(0)
+		#define PXP43_INIT_SESSION_APPTYPE BIT(1)
+		#define PXP43_INIT_SESSION_APPID GENMASK(17, 2)
+	u32 protection_mode;
+		#define PXP43_INIT_SESSION_PROTECTION_ARB 0x2
+	u32 sub_session_id;
+	u32 init_flags;
+	u32 rsvd[12];
+} __packed;
+
+/* PXP-Input-Packet: Init PXP session */
+struct pxp43_create_arb_out {
+	struct pxp_cmd_header header;
+	u32 rsvd[8];
+} __packed;
+
 /* PXP-Input-Packet: Invalidate Stream Key */
 struct pxp43_inv_stream_key_in {
 	struct pxp_cmd_header header;
diff --git a/drivers/gpu/drm/xe/xe_pxp_submit.c b/drivers/gpu/drm/xe/xe_pxp_submit.c
index 41684d666376..c9258c861556 100644
--- a/drivers/gpu/drm/xe/xe_pxp_submit.c
+++ b/drivers/gpu/drm/xe/xe_pxp_submit.c
@@ -26,6 +26,8 @@
 #include "instructions/xe_mi_commands.h"
 #include "regs/xe_gt_regs.h"
 
+#define ARB_SESSION 0xF /* TODO: move to UAPI */
+
 /*
  * The VCS is used for kernel-owned GGTT submissions to issue key termination.
  * Terminations are serialized, so we only need a single queue and a single
@@ -470,6 +472,54 @@ static int gsccs_send_message(struct xe_pxp_gsc_client_resources *gsc_res,
 	return ret;
 }
 
+/**
+ * xe_pxp_submit_session_init - submits a PXP GSC session initialization
+ * @gsc_res: the pxp client resources
+ * @id: the session to initialize
+ *
+ * Submit a message to the GSC FW to initialize (i.e. start) a PXP session.
+ *
+ * Returns 0 if the submission is successful, an errno value otherwise.
+ */
+int xe_pxp_submit_session_init(struct xe_pxp_gsc_client_resources *gsc_res, u32 id)
+{
+	struct xe_device *xe = gsc_res->vm->xe;
+	struct pxp43_create_arb_in msg_in = {0};
+	struct pxp43_create_arb_out msg_out = {0};
+	int ret;
+
+	msg_in.header.api_version = PXP_APIVER(4, 3);
+	msg_in.header.command_id = PXP43_CMDID_INIT_SESSION;
+	msg_in.header.stream_id = (FIELD_PREP(PXP43_INIT_SESSION_APPID, id) |
+				   FIELD_PREP(PXP43_INIT_SESSION_VALID, 1) |
+				   FIELD_PREP(PXP43_INIT_SESSION_APPTYPE, 0));
+	msg_in.header.buffer_len = sizeof(msg_in) - sizeof(msg_in.header);
+
+	if (id == ARB_SESSION)
+		msg_in.protection_mode = PXP43_INIT_SESSION_PROTECTION_ARB;
+
+	ret = gsccs_send_message(gsc_res, &msg_in, sizeof(msg_in),
+				 &msg_out, sizeof(msg_out));
+	if (ret) {
+		drm_err(&xe->drm, "Failed to init session %d, ret=[%d]\n", id, ret);
+	} else if (msg_out.header.status != 0) {
+		if (is_fw_err_platform_config(msg_out.header.status)) {
+			drm_info_once(&xe->drm,
+				      "PXP init-session-%d failed due to BIOS/SOC:0x%08x:%s\n",
+				      id, msg_out.header.status,
+				      fw_err_to_string(msg_out.header.status));
+		} else {
+			drm_dbg(&xe->drm, "PXP init-session-%d failed 0x%08x:%st:\n",
+				id, msg_out.header.status,
+				fw_err_to_string(msg_out.header.status));
+			drm_dbg(&xe->drm, "     cmd-detail: ID=[0x%08x],API-Ver-[0x%08x]\n",
+				msg_in.header.command_id, msg_in.header.api_version);
+		}
+	}
+
+	return ret;
+}
+
 /**
  * xe_pxp_submit_session_invalidation - submits a PXP GSC invalidation
  * @gsc_res: the pxp client resources
diff --git a/drivers/gpu/drm/xe/xe_pxp_submit.h b/drivers/gpu/drm/xe/xe_pxp_submit.h
index 48fdc9b09116..c9efda02f4b0 100644
--- a/drivers/gpu/drm/xe/xe_pxp_submit.h
+++ b/drivers/gpu/drm/xe/xe_pxp_submit.h
@@ -14,6 +14,7 @@ struct xe_pxp_gsc_client_resources;
 int xe_pxp_allocate_execution_resources(struct xe_pxp *pxp);
 void xe_pxp_destroy_execution_resources(struct xe_pxp *pxp);
 
+int xe_pxp_submit_session_init(struct xe_pxp_gsc_client_resources *gsc_res, u32 id);
 int xe_pxp_submit_session_termination(struct xe_pxp *pxp, u32 id);
 int xe_pxp_submit_session_invalidation(struct xe_pxp_gsc_client_resources *gsc_res,
 				       u32 id);
-- 
2.43.0