hdata/tpmrel.c: add firmware event log info to the tpm node

This parses the firmware event log information from the
secureboot_tpm_info HDAT structure and add it to the tpm device tree
node.

There can be multiple secureboot_tpm_info entries with each entry
corresponding to a master processor that has a tpm device, however,
multiple tpm is not supported.

Signed-off-by: Claudio Carvalho <cclaudio@linux.vnet.ibm.com>
Signed-off-by: Stewart Smith <stewart@linux.vnet.ibm.com>

1 files changed, 116 insertions, 0 deletions

diff --git a/hdata/tpmrel.c b/hdata/tpmrel.c
new file mode 100644
index 0000000..5b6731f
--- /dev/null
+++ b/hdata/tpmrel.c
@@ -0,0 +1,116 @@
+/* Copyright 2013-2017 IBM Corp.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * 	http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+ * implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef pr_fmt
+#define pr_fmt(fmt) "TPMREL: " fmt
+#endif
+
+#include <skiboot.h>
+#include <device.h>
+
+#include "spira.h"
+#include "hdata.h"
+#include "hdif.h"
+
+static void tpmrel_add_firmware_event_log(const struct HDIF_common_hdr *hdif_hdr)
+{
+	const struct secureboot_tpm_info *stinfo;
+	struct dt_node *xscom, *node;
+	uint64_t addr;
+	int count, i;
+	unsigned int asize;
+
+	/* Are the hdat values populated? */
+	if (!HDIF_get_idata(hdif_hdr, TPMREL_IDATA_SECUREBOOT_TPM_INFO, &asize))
+		return;
+	if (asize < sizeof(struct HDIF_array_hdr)) {
+		prlog(PR_ERR, "secureboot_tpm_info idata not populated\n");
+		return;
+	}
+
+	count = HDIF_get_iarray_size(hdif_hdr, TPMREL_IDATA_SECUREBOOT_TPM_INFO);
+	if (count > 1) {
+		prlog(PR_ERR, "multiple TPM not supported, count=%d\n", count);
+		return;
+	}
+
+	/*
+	 * There can be multiple secureboot_tpm_info entries with each entry
+	 * corresponding to a master processor that has a tpm device.
+	 * This looks for the tpm node that supposedly exists under the xscom
+	 * node associated with the respective chip_id.
+	 */
+	for (i = 0; i < count; i++) {
+
+		stinfo = HDIF_get_iarray_item(hdif_hdr,
+					      TPMREL_IDATA_SECUREBOOT_TPM_INFO,
+					      i, NULL);
+
+		xscom = find_xscom_for_chip(be32_to_cpu(stinfo->chip_id));
+		if (xscom) {
+			dt_for_each_node(xscom, node) {
+				if (dt_has_node_property(node, "label", "tpm"))
+					break;
+			}
+
+			if (node) {
+				addr = (uint64_t) stinfo +
+					be32_to_cpu(stinfo->srtm_log_offset);
+				dt_add_property_u64s(node, "linux,sml-base", addr);
+				dt_add_property_cells(node, "linux,sml-size",
+						      be32_to_cpu(stinfo->srtm_log_size));
+
+				if (stinfo->tpm_status == TPM_PRESENT_AND_NOT_FUNCTIONAL)
+					dt_add_property_string(node, "status", "disabled");
+			} else {
+				/**
+				 * @fwts-label HDATNoTpmForChipId
+				 * @fwts-advice HDAT secureboot_tpm_info
+				 * structure described a chip id, but no tpm
+				 * node was found under that xscom chip id.
+				 * This is most certainly a hostboot bug.
+				 */
+				prlog(PR_ERR, "TPM node not found for "
+				      "chip_id=%d (HB bug)\n", stinfo->chip_id);
+				continue;
+			}
+		} else {
+			/**
+			 * @fwts-label HDATBadChipIdForTPM
+			 * @fwts-advice HDAT secureboot_tpm_info structure
+			 * described a chip id, but the xscom node for the
+			 * chip_id was not found.
+			 * This is most certainly a firmware bug.
+			 */
+			prlog(PR_ERR, "xscom node not found for chip_id=%d\n",
+			      stinfo->chip_id);
+			continue;
+		}
+	}
+}
+
+void node_stb_parse(void)
+{
+	struct HDIF_common_hdr *hdif_hdr;
+
+	hdif_hdr = get_hdif(&spira.ntuples.node_stb_data, "TPMREL");
+	if (!hdif_hdr) {
+		prlog(PR_DEBUG, "TPMREL data not found\n");
+		return;
+	}
+
+	tpmrel_add_firmware_event_log(hdif_hdr);
+}