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From 7f5c3f8c6c8960d1c374b9c95821c19f230fa34f Mon Sep 17 00:00:00 2001
From: Angel Pons <th3fanbus@gmail.com>
Date: Sun, 8 May 2022 00:56:00 +0200
Subject: [PATCH 09/20] haswell NRI: Add range tracking library
Implement a small library used to keep track of passing ranges. This
will be used by 1D training algorithms when margining some parameter.
Change-Id: I8718e85165160afd7c0c8e730b5ce6c9c00f8a60
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
---
.../intel/haswell/native_raminit/Makefile.mk | 1 +
.../intel/haswell/native_raminit/ranges.c | 109 ++++++++++++++++++
.../intel/haswell/native_raminit/ranges.h | 68 +++++++++++
3 files changed, 178 insertions(+)
create mode 100644 src/northbridge/intel/haswell/native_raminit/ranges.c
create mode 100644 src/northbridge/intel/haswell/native_raminit/ranges.h
diff --git a/src/northbridge/intel/haswell/native_raminit/Makefile.mk b/src/northbridge/intel/haswell/native_raminit/Makefile.mk
index 6e1b365602..2da950771d 100644
--- a/src/northbridge/intel/haswell/native_raminit/Makefile.mk
+++ b/src/northbridge/intel/haswell/native_raminit/Makefile.mk
@@ -9,6 +9,7 @@ romstage-y += io_comp_control.c
romstage-y += memory_map.c
romstage-y += raminit_main.c
romstage-y += raminit_native.c
+romstage-y += ranges.c
romstage-y += reut.c
romstage-y += setup_wdb.c
romstage-y += spd_bitmunching.c
diff --git a/src/northbridge/intel/haswell/native_raminit/ranges.c b/src/northbridge/intel/haswell/native_raminit/ranges.c
new file mode 100644
index 0000000000..cdebc1fa66
--- /dev/null
+++ b/src/northbridge/intel/haswell/native_raminit/ranges.c
@@ -0,0 +1,109 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+#include <types.h>
+
+#include "ranges.h"
+
+void linear_record_pass(
+ struct linear_train_data *const data,
+ const bool pass,
+ const int32_t value,
+ const int32_t start,
+ const int32_t step)
+{
+ /* If this is the first time, initialize all values */
+ if (value == start) {
+ /*
+ * If value passed, create a zero-length region for the current value,
+ * which may be extended as long as the successive values are passing.
+ *
+ * Otherwise, create a zero-length range for the preceding value. This
+ * range cannot be extended by other passing values, which is desired.
+ */
+ data->current.start = start - (pass ? 0 : step);
+ data->current.end = data->current.start;
+ data->largest = data->current;
+ } else if (pass) {
+ /* If this pass is not contiguous, it belongs to a new region */
+ if (data->current.end != (value - step))
+ data->current.start = value;
+
+ /* Update end of current region */
+ data->current.end = value;
+
+ /* Update largest region */
+ if (range_width(data->current) > range_width(data->largest))
+ data->largest = data->current;
+ }
+}
+
+void phase_record_pass(
+ struct phase_train_data *const data,
+ const bool pass,
+ const int32_t value,
+ const int32_t start,
+ const int32_t step)
+{
+ /* If this is the first time, initialize all values */
+ if (value == start) {
+ /*
+ * If value passed, create a zero-length region for the current value,
+ * which may be extended as long as the successive values are passing.
+ *
+ * Otherwise, create a zero-length range for the preceding value. This
+ * range cannot be extended by other passing values, which is desired.
+ */
+ data->current.start = start - (pass ? 0 : step);
+ data->current.end = data->current.start;
+ data->largest = data->current;
+ data->initial = data->current;
+ return;
+ }
+ if (!pass)
+ return;
+
+ /* Update initial region */
+ if (data->initial.end == (value - step))
+ data->initial.end = value;
+
+ /* If this pass is not contiguous, it belongs to a new region */
+ if (data->current.end != (value - step))
+ data->current.start = value;
+
+ /* Update end of current region */
+ data->current.end = value;
+
+ /* Update largest region */
+ if (range_width(data->current) > range_width(data->largest))
+ data->largest = data->current;
+}
+
+void phase_append_initial_to_current(
+ struct phase_train_data *const data,
+ const int32_t start,
+ const int32_t step)
+{
+ /* If initial region is valid and does not overlap, append it */
+ if (data->initial.start == start && data->initial.end != data->current.end)
+ data->current.end += step + range_width(data->initial);
+
+ /* Update largest region */
+ if (range_width(data->current) > range_width(data->largest))
+ data->largest = data->current;
+}
+
+void phase_append_current_to_initial(
+ struct phase_train_data *const data,
+ const int32_t start,
+ const int32_t step)
+{
+ /* If initial region is valid and does not overlap, append it */
+ if (data->initial.start == start && data->initial.end != data->current.end) {
+ data->initial.start -= (step + range_width(data->current));
+ data->current = data->initial;
+ }
+
+ /* Update largest region */
+ if (range_width(data->current) > range_width(data->largest))
+ data->largest = data->current;
+}
diff --git a/src/northbridge/intel/haswell/native_raminit/ranges.h b/src/northbridge/intel/haswell/native_raminit/ranges.h
new file mode 100644
index 0000000000..235392df96
--- /dev/null
+++ b/src/northbridge/intel/haswell/native_raminit/ranges.h
@@ -0,0 +1,68 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+#ifndef HASWELL_RAMINIT_RANGES_H
+#define HASWELL_RAMINIT_RANGES_H
+
+#include <types.h>
+
+/*
+ * Many algorithms shmoo some parameter to determine the largest passing
+ * range. Provide a common implementation to avoid redundant boilerplate.
+ */
+struct passing_range {
+ int32_t start;
+ int32_t end;
+};
+
+/* Structure for linear parameters, such as roundtrip delays */
+struct linear_train_data {
+ struct passing_range current;
+ struct passing_range largest;
+};
+
+/*
+ * Phase ranges are "circular": the first and last indices are contiguous.
+ * To correctly determine the largest passing range, one has to combine
+ * the initial range and the current range when processing the last index.
+ */
+struct phase_train_data {
+ struct passing_range initial;
+ struct passing_range current;
+ struct passing_range largest;
+};
+
+static inline int32_t range_width(const struct passing_range range)
+{
+ return range.end - range.start;
+}
+
+static inline int32_t range_center(const struct passing_range range)
+{
+ return range.start + range_width(range) / 2;
+}
+
+void linear_record_pass(
+ struct linear_train_data *data,
+ bool pass,
+ int32_t value,
+ int32_t start,
+ int32_t step);
+
+void phase_record_pass(
+ struct phase_train_data *data,
+ bool pass,
+ int32_t value,
+ int32_t start,
+ int32_t step);
+
+void phase_append_initial_to_current(
+ struct phase_train_data *data,
+ int32_t start,
+ int32_t step);
+
+void phase_append_current_to_initial(
+ struct phase_train_data *data,
+ int32_t start,
+ int32_t step);
+
+#endif
--
2.39.2
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