1 files changed, 192 insertions, 13 deletions

diff --git a/drivers/gpu/drm/xe/display/xe_hdcp_gsc.c b/drivers/gpu/drm/xe/display/xe_hdcp_gsc.c
index 0f11a39333e2..b35a6f201d4a 100644
--- a/drivers/gpu/drm/xe/display/xe_hdcp_gsc.c
+++ b/drivers/gpu/drm/xe/display/xe_hdcp_gsc.c
@@ -3,32 +3,211 @@
  * Copyright 2023, Intel Corporation.
  */
 
-#include "i915_drv.h"
+#include <drm/drm_print.h>
+#include <drm/intel/i915_hdcp_interface.h>
+#include <linux/delay.h>
+
+#include "abi/gsc_command_header_abi.h"
 #include "intel_hdcp_gsc.h"
+#include "xe_bo.h"
+#include "xe_device.h"
+#include "xe_device_types.h"
+#include "xe_force_wake.h"
+#include "xe_gsc_proxy.h"
+#include "xe_gsc_submit.h"
+#include "xe_map.h"
+#include "xe_pm.h"
+#include "xe_uc_fw.h"
+
+#define HECI_MEADDRESS_HDCP 18
+
+struct intel_hdcp_gsc_context {
+	struct xe_device *xe;
+	struct xe_bo *hdcp_bo;
+	u64 hdcp_cmd_in;
+	u64 hdcp_cmd_out;
+};
 
-bool intel_hdcp_gsc_cs_required(struct drm_i915_private *i915)
+#define HDCP_GSC_HEADER_SIZE sizeof(struct intel_gsc_mtl_header)
+
+bool intel_hdcp_gsc_check_status(struct drm_device *drm)
 {
-	return true;
+	struct xe_device *xe = to_xe_device(drm);
+	struct xe_tile *tile = xe_device_get_root_tile(xe);
+	struct xe_gt *gt = tile->media_gt;
+	struct xe_gsc *gsc = &gt->uc.gsc;
+	bool ret = true;
+	unsigned int fw_ref;
+
+	if (!gsc || !xe_uc_fw_is_enabled(&gsc->fw)) {
+		drm_dbg_kms(&xe->drm,
+			    "GSC Components not ready for HDCP2.x\n");
+		return false;
+	}
+
+	xe_pm_runtime_get(xe);
+	fw_ref = xe_force_wake_get(gt_to_fw(gt), XE_FW_GSC);
+	if (!fw_ref) {
+		drm_dbg_kms(&xe->drm,
+			    "failed to get forcewake to check proxy status\n");
+		ret = false;
+		goto out;
+	}
+
+	if (!xe_gsc_proxy_init_done(gsc))
+		ret = false;
+
+	xe_force_wake_put(gt_to_fw(gt), fw_ref);
+out:
+	xe_pm_runtime_put(xe);
+	return ret;
 }
 
-bool intel_hdcp_gsc_check_status(struct drm_i915_private *i915)
+/*This function helps allocate memory for the command that we will send to gsc cs */
+static int intel_hdcp_gsc_initialize_message(struct xe_device *xe,
+					     struct intel_hdcp_gsc_context *gsc_context)
 {
-	return false;
+	struct xe_bo *bo = NULL;
+	u64 cmd_in, cmd_out;
+	int ret = 0;
+
+	/* allocate object of two page for HDCP command memory and store it */
+	bo = xe_bo_create_pin_map(xe, xe_device_get_root_tile(xe), NULL, PAGE_SIZE * 2,
+				  ttm_bo_type_kernel,
+				  XE_BO_FLAG_SYSTEM |
+				  XE_BO_FLAG_GGTT);
+
+	if (IS_ERR(bo)) {
+		drm_err(&xe->drm, "Failed to allocate bo for HDCP streaming command!\n");
+		ret = PTR_ERR(bo);
+		goto out;
+	}
+
+	cmd_in = xe_bo_ggtt_addr(bo);
+	cmd_out = cmd_in + PAGE_SIZE;
+	xe_map_memset(xe, &bo->vmap, 0, 0, bo->size);
+
+	gsc_context->hdcp_bo = bo;
+	gsc_context->hdcp_cmd_in = cmd_in;
+	gsc_context->hdcp_cmd_out = cmd_out;
+	gsc_context->xe = xe;
+
+out:
+	return ret;
 }
 
-int intel_hdcp_gsc_init(struct drm_i915_private *i915)
+struct intel_hdcp_gsc_context *intel_hdcp_gsc_context_alloc(struct drm_device *drm)
 {
-	drm_info(&i915->drm, "HDCP support not yet implemented\n");
-	return -ENODEV;
+	struct xe_device *xe = to_xe_device(drm);
+	struct intel_hdcp_gsc_context *gsc_context;
+	int ret;
+
+	gsc_context = kzalloc(sizeof(*gsc_context), GFP_KERNEL);
+	if (!gsc_context)
+		return ERR_PTR(-ENOMEM);
+
+	/*
+	 * NOTE: No need to lock the comp mutex here as it is already
+	 * going to be taken before this function called
+	 */
+	ret = intel_hdcp_gsc_initialize_message(xe, gsc_context);
+	if (ret) {
+		drm_err(&xe->drm, "Could not initialize gsc_context\n");
+		kfree(gsc_context);
+		gsc_context = ERR_PTR(ret);
+	}
+
+	return gsc_context;
 }
 
-void intel_hdcp_gsc_fini(struct drm_i915_private *i915)
+void intel_hdcp_gsc_context_free(struct intel_hdcp_gsc_context *gsc_context)
 {
+	if (!gsc_context)
+		return;
+
+	xe_bo_unpin_map_no_vm(gsc_context->hdcp_bo);
+	kfree(gsc_context);
 }
 
-ssize_t intel_hdcp_gsc_msg_send(struct drm_i915_private *i915, u8 *msg_in,
-				size_t msg_in_len, u8 *msg_out,
-				size_t msg_out_len)
+static int xe_gsc_send_sync(struct xe_device *xe,
+			    struct intel_hdcp_gsc_context *gsc_context,
+			    u32 msg_size_in, u32 msg_size_out,
+			    u32 addr_out_off)
 {
-	return -ENODEV;
+	struct xe_gt *gt = gsc_context->hdcp_bo->tile->media_gt;
+	struct iosys_map *map = &gsc_context->hdcp_bo->vmap;
+	struct xe_gsc *gsc = &gt->uc.gsc;
+	int ret;
+
+	ret = xe_gsc_pkt_submit_kernel(gsc, gsc_context->hdcp_cmd_in, msg_size_in,
+				       gsc_context->hdcp_cmd_out, msg_size_out);
+	if (ret) {
+		drm_err(&xe->drm, "failed to send gsc HDCP msg (%d)\n", ret);
+		return ret;
+	}
+
+	if (xe_gsc_check_and_update_pending(xe, map, 0, map, addr_out_off))
+		return -EAGAIN;
+
+	ret = xe_gsc_read_out_header(xe, map, addr_out_off,
+				     sizeof(struct hdcp_cmd_header), NULL);
+
+	return ret;
+}
+
+ssize_t intel_hdcp_gsc_msg_send(struct intel_hdcp_gsc_context *gsc_context,
+				void *msg_in, size_t msg_in_len,
+				void *msg_out, size_t msg_out_len)
+{
+	struct xe_device *xe = gsc_context->xe;
+	const size_t max_msg_size = PAGE_SIZE - HDCP_GSC_HEADER_SIZE;
+	u64 host_session_id;
+	u32 msg_size_in, msg_size_out;
+	u32 addr_out_off, addr_in_wr_off = 0;
+	int ret, tries = 0;
+
+	if (msg_in_len > max_msg_size || msg_out_len > max_msg_size) {
+		ret = -ENOSPC;
+		goto out;
+	}
+
+	msg_size_in = msg_in_len + HDCP_GSC_HEADER_SIZE;
+	msg_size_out = msg_out_len + HDCP_GSC_HEADER_SIZE;
+	addr_out_off = PAGE_SIZE;
+
+	host_session_id = xe_gsc_create_host_session_id();
+	xe_pm_runtime_get_noresume(xe);
+	addr_in_wr_off = xe_gsc_emit_header(xe, &gsc_context->hdcp_bo->vmap,
+					    addr_in_wr_off, HECI_MEADDRESS_HDCP,
+					    host_session_id, msg_in_len);
+	xe_map_memcpy_to(xe, &gsc_context->hdcp_bo->vmap, addr_in_wr_off,
+			 msg_in, msg_in_len);
+	/*
+	 * Keep sending request in case the pending bit is set no need to add
+	 * message handle as we are using same address hence loc. of header is
+	 * same and it will contain the message handle. we will send the message
+	 * 20 times each message 50 ms apart
+	 */
+	do {
+		ret = xe_gsc_send_sync(xe, gsc_context, msg_size_in, msg_size_out,
+				       addr_out_off);
+
+		/* Only try again if gsc says so */
+		if (ret != -EAGAIN)
+			break;
+
+		msleep(50);
+
+	} while (++tries < 20);
+
+	if (ret)
+		goto out;
+
+	xe_map_memcpy_from(xe, msg_out, &gsc_context->hdcp_bo->vmap,
+			   addr_out_off + HDCP_GSC_HEADER_SIZE,
+			   msg_out_len);
+
+out:
+	xe_pm_runtime_put(xe);
+	return ret;
 }