lib/i915: Introduce library intel_mocs
Add new library intel_mocs for mocs settings.
v2: make definitions and struct private (Kamil)
Signed-off-by: Apoorva Singh <apoorva1.singh@intel.com>
Cc: Zbigniew Kempczyński <zbigniew.kempczynski@intel.com>
Cc: Arjun Melkaveri <arjun.melkaveri@intel.com>
Reviewed-by: Kamil Konieczny <kamil.konieczny@linux.intel.com>
Reviewed-by: Zbigniew Kempczyński <zbigniew.kempczynski@intel.com>
diff --git a/lib/i915/intel_mocs.c b/lib/i915/intel_mocs.c
new file mode 100644
index 0000000..df541ab
--- /dev/null
+++ b/lib/i915/intel_mocs.c
@@ -0,0 +1,69 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright © 2022 Intel Corporation
+ */
+
+#include "igt.h"
+#include "i915/gem.h"
+#include "intel_mocs.h"
+
+#define DG1_MOCS_UC_IDX 1
+#define DG1_MOCS_WB_IDX 5
+#define DG2_MOCS_UC_IDX 1
+#define DG2_MOCS_WB_IDX 3
+#define GEN12_MOCS_UC_IDX 3
+#define GEN12_MOCS_WB_IDX 2
+#define XY_BLOCK_COPY_BLT_MOCS_SHIFT 21
+#define XY_CTRL_SURF_COPY_BLT_MOCS_SHIFT 25
+
+struct drm_i915_mocs_index {
+ uint8_t uc_index;
+ uint8_t wb_index;
+};
+
+static void get_mocs_index(int fd, struct drm_i915_mocs_index *mocs)
+{
+ uint16_t devid = intel_get_drm_devid(fd);
+
+ /*
+ * Gen >= 12 onwards don't have a setting for PTE,
+ * so using I915_MOCS_PTE as mocs index may leads to
+ * some undefined MOCS behavior.
+ * This helper function is providing current UC as well
+ * as WB MOCS index based on platform.
+ */
+ if (IS_DG1(devid)) {
+ mocs->uc_index = DG1_MOCS_UC_IDX;
+ mocs->wb_index = DG1_MOCS_WB_IDX;
+ } else if (IS_DG2(devid)) {
+ mocs->uc_index = DG2_MOCS_UC_IDX;
+ mocs->wb_index = DG2_MOCS_WB_IDX;
+
+ } else if (IS_GEN12(devid)) {
+ mocs->uc_index = GEN12_MOCS_UC_IDX;
+ mocs->wb_index = GEN12_MOCS_WB_IDX;
+ } else {
+ mocs->uc_index = I915_MOCS_PTE;
+ mocs->wb_index = I915_MOCS_CACHED;
+ }
+}
+
+/* BitField [6:1] represents index to MOCS Tables
+ * BitField [0] represents Encryption/Decryption
+ */
+
+uint8_t intel_get_wb_mocs(int fd)
+{
+ struct drm_i915_mocs_index mocs;
+
+ get_mocs_index(fd, &mocs);
+ return mocs.wb_index << 1;
+}
+
+uint8_t intel_get_uc_mocs(int fd)
+{
+ struct drm_i915_mocs_index mocs;
+
+ get_mocs_index(fd, &mocs);
+ return mocs.uc_index << 1;
+}
diff --git a/lib/i915/intel_mocs.h b/lib/i915/intel_mocs.h
new file mode 100644
index 0000000..255eac0
--- /dev/null
+++ b/lib/i915/intel_mocs.h
@@ -0,0 +1,12 @@
+/* SPDX-License-Identifier: MIT */
+/*
+ * Copyright © 2022 Intel Corporation
+ */
+
+#ifndef _INTEL_MOCS_H
+#define _INTEL_MOCS_H
+
+uint8_t intel_get_wb_mocs(int fd);
+uint8_t intel_get_uc_mocs(int fd);
+
+#endif /* _INTEL_MOCS_H */
diff --git a/lib/meson.build b/lib/meson.build
index 3e43316..a5fe91d 100644
--- a/lib/meson.build
+++ b/lib/meson.build
@@ -11,6 +11,7 @@
'i915/gem_mman.c',
'i915/gem_vm.c',
'i915/intel_memory_region.c',
+ 'i915/intel_mocs.c',
'igt_collection.c',
'igt_color_encoding.c',
'igt_debugfs.c',
