drm/xe/gsc: Parse GSC FW header

The GSC blob starts with a layout header, from which we can move to the
boot directory, which in turns allows us to find the CPD. The CPD uses
the same format as the one in the HuC binary, so we can re-use the same
parsing code to get to the manifest, which contains the release and
security versions of the FW.

v2: Fix comments in struct definition (John)

Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Cc: Alan Previn <alan.previn.teres.alexis@intel.com>
Cc: John Harrison <John.C.Harrison@Intel.com>
Cc: Lucas De Marchi <lucas.demarchi@intel.com>
Reviewed-by: John Harrison <John.C.Harrison@Intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

1 files changed, 77 insertions, 0 deletions

diff --git a/drivers/gpu/drm/xe/xe_uc_fw.c b/drivers/gpu/drm/xe/xe_uc_fw.c
index 5eaf6ce0d025..2d0fb7058d66 100644
--- a/drivers/gpu/drm/xe/xe_uc_fw.c
+++ b/drivers/gpu/drm/xe/xe_uc_fw.c
@@ -12,6 +12,7 @@
 #include "xe_bo.h"
 #include "xe_device_types.h"
 #include "xe_force_wake.h"
+#include "xe_gsc.h"
 #include "xe_gt.h"
 #include "xe_map.h"
 #include "xe_mmio.h"
@@ -488,6 +489,13 @@ static int parse_cpd_header(struct xe_uc_fw *uc_fw, const void *data, size_t siz
 	release->minor = manifest->fw_version.minor;
 	release->patch = manifest->fw_version.hotfix;
 
+	if (uc_fw->type == XE_UC_FW_TYPE_GSC) {
+		struct xe_gsc *gsc = container_of(uc_fw, struct xe_gsc, fw);
+
+		release->build = manifest->fw_version.build;
+		gsc->security_version = manifest->security_version;
+	}
+
 	/* then optionally look for the css header */
 	if (css_entry) {
 		int ret;
@@ -517,6 +525,73 @@ static int parse_cpd_header(struct xe_uc_fw *uc_fw, const void *data, size_t siz
 	return 0;
 }
 
+static int parse_gsc_layout(struct xe_uc_fw *uc_fw, const void *data, size_t size)
+{
+	struct xe_gt *gt = uc_fw_to_gt(uc_fw);
+	const struct gsc_layout_pointers *layout = data;
+	const struct gsc_bpdt_header *bpdt_header = NULL;
+	const struct gsc_bpdt_entry *bpdt_entry = NULL;
+	size_t min_size = sizeof(*layout);
+	int i;
+
+	if (size < min_size) {
+		xe_gt_err(gt, "GSC FW too small! %zu < %zu\n", size, min_size);
+		return -ENODATA;
+	}
+
+	min_size = layout->boot1.offset + layout->boot1.size;
+	if (size < min_size) {
+		xe_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) {
+		xe_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 != GSC_BPDT_HEADER_SIGNATURE) {
+		xe_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) {
+		xe_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 & GSC_BPDT_ENTRY_TYPE_MASK) !=
+		    GSC_BPDT_ENTRY_TYPE_GSC_RBE)
+			continue;
+
+		min_size = bpdt_entry->sub_partition_offset;
+
+		/* the CPD header parser will check that the CPD header fits */
+		if (layout->boot1.size < min_size) {
+			xe_gt_err(gt, "GSC FW boot section too small for CPD offset: %u < %zu\n",
+				  layout->boot1.size, min_size);
+			return -ENODATA;
+		}
+
+		return parse_cpd_header(uc_fw,
+					(void *)bpdt_header + min_size,
+					layout->boot1.size - min_size,
+					"RBEP.man", NULL);
+	}
+
+	xe_gt_err(gt, "couldn't find CPD header in GSC binary!\n");
+	return -ENODATA;
+}
+
 static int parse_headers(struct xe_uc_fw *uc_fw, const struct firmware *fw)
 {
 	int ret;
@@ -526,6 +601,8 @@ static int parse_headers(struct xe_uc_fw *uc_fw, const struct firmware *fw)
 	 * releases use GSC CPD headers.
 	 */
 	switch (uc_fw->type) {
+	case XE_UC_FW_TYPE_GSC:
+		return parse_gsc_layout(uc_fw, fw->data, fw->size);
 	case XE_UC_FW_TYPE_HUC:
 		ret = parse_cpd_header(uc_fw, fw->data, fw->size, "HUCP.man", "huc_fw");
 		if (!ret || ret != -ENOENT)