drm/xe/gsc: Query GSC compatibility version

The version is obtained via a dedicated MKHI GSC HECI command.
The compatibility version is what we want to match against for the GSC,
so we need to call the FW version checker after obtaining the version.

Since this is the first time we send a GSC HECI command via the GSCCS,
this patch also introduces common infrastructure to send such commands
to the GSC. Communication with the GSC FW is done via input/output
buffers, whose addresses are provided via a GSCCS command. The buffers
contain a generic header and a client-specific packet (e.g. PXP, HDCP);
the clients don't care about the header format and/or the GSCCS command
in the batch, they only care about their client-specific header. This
patch therefore introduces helpers that allow the callers to
automatically fill in the input header, submit the GSCCS job and decode
the output header, to make it so that the caller only needs to worry about
their client-specific input and output messages.

v3: squash of 2 separate patches ahead of merge, so that the common
functions and their first user are added at the same time

Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Cc: Alan Previn <alan.previn.teres.alexis@intel.com>
Cc: Suraj Kandpal <suraj.kandpal@intel.com>
Cc: John Harrison <John.C.Harrison@Intel.com>
Reviewed-by: John Harrison <John.C.Harrison@Intel.Com> #v1
Reviewed-by: Suraj Kandpal <suraj.kandpal@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

1 files changed, 82 insertions, 0 deletions

diff --git a/drivers/gpu/drm/xe/xe_gsc.c b/drivers/gpu/drm/xe/xe_gsc.c
index 907585846a89..d8ec04e3c006 100644
--- a/drivers/gpu/drm/xe/xe_gsc.c
+++ b/drivers/gpu/drm/xe/xe_gsc.c
@@ -7,11 +7,13 @@
 
 #include <drm/drm_managed.h>
 
+#include "abi/gsc_mkhi_commands_abi.h"
 #include "generated/xe_wa_oob.h"
 #include "xe_bb.h"
 #include "xe_bo.h"
 #include "xe_device.h"
 #include "xe_exec_queue.h"
+#include "xe_gsc_submit.h"
 #include "xe_gt.h"
 #include "xe_gt_printk.h"
 #include "xe_map.h"
@@ -91,6 +93,78 @@ static int emit_gsc_upload(struct xe_gsc *gsc)
 	return 0;
 }
 
+#define version_query_wr(xe_, map_, offset_, field_, val_) \
+	xe_map_wr_field(xe_, map_, offset_, struct gsc_get_compatibility_version_in, field_, val_)
+#define version_query_rd(xe_, map_, offset_, field_) \
+	xe_map_rd_field(xe_, map_, offset_, struct gsc_get_compatibility_version_out, field_)
+
+static u32 emit_version_query_msg(struct xe_device *xe, struct iosys_map *map, u32 wr_offset)
+{
+	xe_map_memset(xe, map, wr_offset, 0, sizeof(struct gsc_get_compatibility_version_in));
+
+	version_query_wr(xe, map, wr_offset, header.group_id, MKHI_GROUP_ID_GFX_SRV);
+	version_query_wr(xe, map, wr_offset, header.command,
+			 MKHI_GFX_SRV_GET_HOST_COMPATIBILITY_VERSION);
+
+	return wr_offset + sizeof(struct gsc_get_compatibility_version_in);
+}
+
+#define GSC_VER_PKT_SZ SZ_4K /* 4K each for input and output */
+static int query_compatibility_version(struct xe_gsc *gsc)
+{
+	struct xe_uc_fw_version *compat = &gsc->fw.versions.found[XE_UC_FW_VER_COMPATIBILITY];
+	struct xe_gt *gt = gsc_to_gt(gsc);
+	struct xe_tile *tile = gt_to_tile(gt);
+	struct xe_device *xe = gt_to_xe(gt);
+	struct xe_bo *bo;
+	u32 wr_offset;
+	u32 rd_offset;
+	u64 ggtt_offset;
+	int err;
+
+	bo = xe_bo_create_pin_map(xe, tile, NULL, GSC_VER_PKT_SZ * 2,
+				  ttm_bo_type_kernel,
+				  XE_BO_CREATE_SYSTEM_BIT |
+				  XE_BO_CREATE_GGTT_BIT);
+	if (IS_ERR(bo)) {
+		xe_gt_err(gt, "failed to allocate bo for GSC version query\n");
+		return PTR_ERR(bo);
+	}
+
+	ggtt_offset = xe_bo_ggtt_addr(bo);
+
+	wr_offset = xe_gsc_emit_header(xe, &bo->vmap, 0, HECI_MEADDRESS_MKHI, 0,
+				       sizeof(struct gsc_get_compatibility_version_in));
+	wr_offset = emit_version_query_msg(xe, &bo->vmap, wr_offset);
+
+	err = xe_gsc_pkt_submit_kernel(gsc, ggtt_offset, wr_offset,
+				       ggtt_offset + GSC_VER_PKT_SZ,
+				       GSC_VER_PKT_SZ);
+	if (err) {
+		xe_gt_err(gt,
+			  "failed to submit GSC request for compatibility version: %d\n",
+			  err);
+		goto out_bo;
+	}
+
+	err = xe_gsc_read_out_header(xe, &bo->vmap, GSC_VER_PKT_SZ,
+				     sizeof(struct gsc_get_compatibility_version_out),
+				     &rd_offset);
+	if (err) {
+		xe_gt_err(gt, "HuC: invalid GSC reply for version query (err=%d)\n", err);
+		return err;
+	}
+
+	compat->major = version_query_rd(xe, &bo->vmap, rd_offset, compat_major);
+	compat->minor = version_query_rd(xe, &bo->vmap, rd_offset, compat_minor);
+
+	xe_gt_info(gt, "found GSC cv%u.%u\n", compat->major, compat->minor);
+
+out_bo:
+	xe_bo_unpin_map_no_vm(bo);
+	return err;
+}
+
 static int gsc_fw_is_loaded(struct xe_gt *gt)
 {
 	return xe_mmio_read32(gt, HECI_FWSTS1(MTL_GSC_HECI1_BASE)) &
@@ -159,6 +233,14 @@ static int gsc_upload(struct xe_gsc *gsc)
 		return err;
 	}
 
+	err = query_compatibility_version(gsc);
+	if (err)
+		return err;
+
+	err = xe_uc_fw_check_version_requirements(&gsc->fw);
+	if (err)
+		return err;
+
 	xe_gt_dbg(gt, "GSC FW async load completed\n");
 
 	return 0;