drm/xe/debugfs: Add debugfs for pcode information

Introduce a pcode_info debugfs entry to report pcode details.
This initial implementation exposes the pcode version.
This can aid debugging when the pcode version is needed.

Signed-off-by: Karthik Poosa <karthik.poosa@intel.com>
Reviewed-by: Michael J. Ruhl <michael.j.ruhl@intel.com>
Link: https://patch.msgid.link/20260702092540.1005095-3-karthik.poosa@intel.com
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>

1 files changed, 33 insertions, 0 deletions

diff --git a/drivers/gpu/drm/xe/xe_debugfs.c b/drivers/gpu/drm/xe/xe_debugfs.c
index 3c018dbccc07..8c391c7b017a 100644
--- a/drivers/gpu/drm/xe/xe_debugfs.c
+++ b/drivers/gpu/drm/xe/xe_debugfs.c
@@ -21,6 +21,7 @@
 #include "xe_guc_ads.h"
 #include "xe_hw_engine.h"
 #include "xe_mmio.h"
+#include "xe_pcode.h"
 #include "xe_pm.h"
 #include "xe_psmi.h"
 #include "xe_pxp_debugfs.h"
@@ -160,6 +161,22 @@ static int workaround_info(struct seq_file *m, void *data)
 	return 0;
 }
 
+static int pcode_info(struct seq_file *m, void *data)
+{
+	struct xe_device *xe = node_to_xe(m->private);
+	struct drm_printer p = drm_seq_file_printer(m);
+	struct xe_pcode_version version;
+	int ret = 0;
+
+	ret = xe_get_pcode_version(xe, &version);
+	if (ret)
+		return ret;
+
+	drm_printf(&p, "pcode version: %u.%u.%u\n", version.major,
+		   version.minor, version.engg);
+	return 0;
+}
+
 static int dgfx_pkg_residencies_show(struct seq_file *m, void *data)
 {
 	struct xe_device *xe;
@@ -220,6 +237,10 @@ static const struct drm_info_list debugfs_list[] = {
 	{ .name = "workarounds", .show = workaround_info, },
 };
 
+static const struct drm_info_list pcode_info_debugfs[] = {
+	{ .name = "pcode_info", .show = pcode_info, },
+};
+
 static const struct drm_info_list debugfs_residencies[] = {
 	{ .name = "dgfx_pkg_residencies", .show = dgfx_pkg_residencies_show, },
 	{ .name = "dgfx_pcie_link_residencies", .show = dgfx_pcie_link_residencies_show, },
@@ -566,6 +587,18 @@ void xe_debugfs_register(struct xe_device *xe)
 					  &inject_csc_hw_error);
 	}
 
+	/*
+	 * Pcode version read from PMT is currently only supported on CRI and BMG platforms in PF
+	 * mode, as both platforms support the necessary telemetry read mechanism and have a fixed
+	 * PUNIT_VERSION_OFFSET.
+	 * Attempting this access on other platforms must be verified before enabling support.
+	 */
+	if (!IS_SRIOV_VF(xe) &&
+	    (xe->info.platform == XE_CRESCENTISLAND || xe->info.platform == XE_BATTLEMAGE))
+		drm_debugfs_create_files(pcode_info_debugfs,
+					 ARRAY_SIZE(pcode_info_debugfs),
+					 root, minor);
+
 	debugfs_create_file("forcewake_all", 0400, root, xe,
 			    &forcewake_all_fops);