drm/i915/mtl/gsc: extract release and security versions from the gsc binary

The release and security versions of the GSC binary are not used at
runtime to decide interface compatibility (there is a separate version
for that), but they're still useful for debug, so it is still worth
extracting them and printing them out in dmesg.

To get to these version, we need to navigate through various headers in
the binary. See in-code comment for details.

v2: fix and improve size checks when crawling the binary header, add
comment about the different version, wrap the partition base/offset
pairs in the GSC header in a struct (Alan)

Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Cc: Alan Previn <alan.previn.teres.alexis@intel.com>
Reviewed-by: Alan Previn <alan.previn.teres.alexis@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230612181529.2222451-3-daniele.ceraolospurio@intel.com

1 files changed, 156 insertions, 1 deletions

diff --git a/drivers/gpu/drm/i915/gt/uc/intel_gsc_fw.c b/drivers/gpu/drm/i915/gt/uc/intel_gsc_fw.c
index e6fa7745ff77..4c728ba6f4f7 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_gsc_fw.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_gsc_fw.c
@@ -9,6 +9,7 @@
 #include "gt/intel_gt.h"
 #include "gt/intel_gt_print.h"
 #include "gt/intel_ring.h"
+#include "intel_gsc_binary_headers.h"
 #include "intel_gsc_fw.h"
 
 #define GSC_FW_STATUS_REG			_MMIO(0x116C40)
@@ -48,6 +49,156 @@ bool intel_gsc_uc_fw_init_done(struct intel_gsc_uc *gsc)
 	return gsc_uc_get_fw_status(gsc_uc_to_gt(gsc)->uncore) & GSC_FW_INIT_COMPLETE_BIT;
 }
 
+static inline u32 cpd_entry_offset(const struct intel_gsc_cpd_entry *entry)
+{
+	return entry->offset & INTEL_GSC_CPD_ENTRY_OFFSET_MASK;
+}
+
+int intel_gsc_fw_get_binary_info(struct intel_uc_fw *gsc_fw, const void *data, size_t size)
+{
+	struct intel_gsc_uc *gsc = container_of(gsc_fw, struct intel_gsc_uc, fw);
+	struct intel_gt *gt = gsc_uc_to_gt(gsc);
+	const struct intel_gsc_layout_pointers *layout = data;
+	const struct intel_gsc_bpdt_header *bpdt_header = NULL;
+	const struct intel_gsc_bpdt_entry *bpdt_entry = NULL;
+	const struct intel_gsc_cpd_header_v2 *cpd_header = NULL;
+	const struct intel_gsc_cpd_entry *cpd_entry = NULL;
+	const struct intel_gsc_manifest_header *manifest;
+	size_t min_size = sizeof(*layout);
+	int i;
+
+	if (size < min_size) {
+		gt_err(gt, "GSC FW too small! %zu < %zu\n", size, min_size);
+		return -ENODATA;
+	}
+
+	/*
+	 * The GSC binary starts with the pointer layout, which contains the
+	 * locations of the various partitions of the binary. The one we're
+	 * interested in to get the version is the boot1 partition, where we can
+	 * find a BPDT header followed by entries, one of which points to the
+	 * RBE sub-section of the partition. From here, we can parse the CPD
+	 * header and the following entries to find the manifest location
+	 * (entry identified by the "RBEP.man" name), from which we can finally
+	 * extract the version.
+	 *
+	 * --------------------------------------------------
+	 * [  intel_gsc_layout_pointers                     ]
+	 * [      ...                                       ]
+	 * [      boot1.offset  >---------------------------]------o
+	 * [      ...                                       ]      |
+	 * --------------------------------------------------      |
+	 *                                                         |
+	 * --------------------------------------------------      |
+	 * [  intel_gsc_bpdt_header                         ]<-----o
+	 * --------------------------------------------------
+	 * [  intel_gsc_bpdt_entry[]                        ]
+	 * [      entry1                                    ]
+	 * [      ...                                       ]
+	 * [      entryX                                    ]
+	 * [          type == GSC_RBE                       ]
+	 * [          offset  >-----------------------------]------o
+	 * [      ...                                       ]      |
+	 * --------------------------------------------------      |
+	 *                                                         |
+	 * --------------------------------------------------      |
+	 * [  intel_gsc_cpd_header_v2                       ]<-----o
+	 * --------------------------------------------------
+	 * [  intel_gsc_cpd_entry[]                         ]
+	 * [      entry1                                    ]
+	 * [      ...                                       ]
+	 * [      entryX                                    ]
+	 * [          "RBEP.man"                            ]
+	 * [           ...                                  ]
+	 * [           offset  >----------------------------]------o
+	 * [      ...                                       ]      |
+	 * --------------------------------------------------      |
+	 *                                                         |
+	 * --------------------------------------------------      |
+	 * [ intel_gsc_manifest_header                      ]<-----o
+	 * [  ...                                           ]
+	 * [  intel_gsc_version     fw_version              ]
+	 * [  ...                                           ]
+	 * --------------------------------------------------
+	 */
+
+	min_size = layout->boot1.offset + layout->boot1.size;
+	if (size < min_size) {
+		gt_err(gt, "GSC FW too small for boot section! %zu < %zu\n",
+		       size, min_size);
+		return -ENODATA;
+	}
+
+	min_size = sizeof(*bpdt_header);
+	if (layout->boot1.size < min_size) {
+		gt_err(gt, "GSC FW boot section too small for BPDT header: %u < %zu\n",
+		       layout->boot1.size, min_size);
+		return -ENODATA;
+	}
+
+	bpdt_header = data + layout->boot1.offset;
+	if (bpdt_header->signature != INTEL_GSC_BPDT_HEADER_SIGNATURE) {
+		gt_err(gt, "invalid signature for BPDT header: 0x%08x!\n",
+		       bpdt_header->signature);
+		return -EINVAL;
+	}
+
+	min_size += sizeof(*bpdt_entry) * bpdt_header->descriptor_count;
+	if (layout->boot1.size < min_size) {
+		gt_err(gt, "GSC FW boot section too small for BPDT entries: %u < %zu\n",
+		       layout->boot1.size, min_size);
+		return -ENODATA;
+	}
+
+	bpdt_entry = (void *)bpdt_header + sizeof(*bpdt_header);
+	for (i = 0; i < bpdt_header->descriptor_count; i++, bpdt_entry++) {
+		if ((bpdt_entry->type & INTEL_GSC_BPDT_ENTRY_TYPE_MASK) !=
+		    INTEL_GSC_BPDT_ENTRY_TYPE_GSC_RBE)
+			continue;
+
+		cpd_header = (void *)bpdt_header + bpdt_entry->sub_partition_offset;
+		min_size = bpdt_entry->sub_partition_offset + sizeof(*cpd_header);
+		break;
+	}
+
+	if (!cpd_header) {
+		gt_err(gt, "couldn't find CPD header in GSC binary!\n");
+		return -ENODATA;
+	}
+
+	if (layout->boot1.size < min_size) {
+		gt_err(gt, "GSC FW boot section too small for CPD header: %u < %zu\n",
+		       layout->boot1.size, min_size);
+		return -ENODATA;
+	}
+
+	if (cpd_header->header_marker != INTEL_GSC_CPD_HEADER_MARKER) {
+		gt_err(gt, "invalid marker for CPD header in GSC bin: 0x%08x!\n",
+		       cpd_header->header_marker);
+		return -EINVAL;
+	}
+
+	min_size += sizeof(*cpd_entry) * cpd_header->num_of_entries;
+	if (layout->boot1.size < min_size) {
+		gt_err(gt, "GSC FW boot section too small for CPD entries: %u < %zu\n",
+		       layout->boot1.size, min_size);
+		return -ENODATA;
+	}
+
+	cpd_entry = (void *)cpd_header + cpd_header->header_length;
+	for (i = 0; i < cpd_header->num_of_entries; i++, cpd_entry++) {
+		if (strcmp(cpd_entry->name, "RBEP.man") == 0) {
+			manifest = (void *)cpd_header + cpd_entry_offset(cpd_entry);
+			intel_uc_fw_version_from_gsc_manifest(&gsc->release,
+							      manifest);
+			gsc->security_version = manifest->security_version;
+			break;
+		}
+	}
+
+	return 0;
+}
+
 static int emit_gsc_fw_load(struct i915_request *rq, struct intel_gsc_uc *gsc)
 {
 	u32 offset = i915_ggtt_offset(gsc->local);
@@ -212,7 +363,11 @@ int intel_gsc_uc_fw_upload(struct intel_gsc_uc *gsc)
 	/* FW is not fully operational until we enable SW proxy */
 	intel_uc_fw_change_status(gsc_fw, INTEL_UC_FIRMWARE_TRANSFERRED);
 
-	gt_info(gt, "Loaded GSC firmware %s\n", gsc_fw->file_selected.path);
+	gt_info(gt, "Loaded GSC firmware %s (r%u.%u.%u.%u, svn%u)\n",
+		gsc_fw->file_selected.path,
+		gsc->release.major, gsc->release.minor,
+		gsc->release.patch, gsc->release.build,
+		gsc->security_version);
 
 	return 0;