Adding upstream version 6.1.76.upstream/6.1.76

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 162 insertions, 0 deletions

diff --git a/drivers/platform/x86/intel/pmt/telemetry.c b/drivers/platform/x86/intel/pmt/telemetry.c
new file mode 100644
index 000000000..5e4009c05
--- /dev/null
+++ b/drivers/platform/x86/intel/pmt/telemetry.c
@@ -0,0 +1,162 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Intel Platform Monitory Technology Telemetry driver
+ *
+ * Copyright (c) 2020, Intel Corporation.
+ * All Rights Reserved.
+ *
+ * Author: "David E. Box" <david.e.box@linux.intel.com>
+ */
+
+#include <linux/auxiliary_bus.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/slab.h>
+#include <linux/uaccess.h>
+#include <linux/overflow.h>
+
+#include "../vsec.h"
+#include "class.h"
+
+#define TELEM_SIZE_OFFSET	0x0
+#define TELEM_GUID_OFFSET	0x4
+#define TELEM_BASE_OFFSET	0x8
+#define TELEM_ACCESS(v)		((v) & GENMASK(3, 0))
+#define TELEM_TYPE(v)		(((v) & GENMASK(7, 4)) >> 4)
+/* size is in bytes */
+#define TELEM_SIZE(v)		(((v) & GENMASK(27, 12)) >> 10)
+
+/* Used by client hardware to identify a fixed telemetry entry*/
+#define TELEM_CLIENT_FIXED_BLOCK_GUID	0x10000000
+
+enum telem_type {
+	TELEM_TYPE_PUNIT = 0,
+	TELEM_TYPE_CRASHLOG,
+	TELEM_TYPE_PUNIT_FIXED,
+};
+
+struct pmt_telem_priv {
+	int				num_entries;
+	struct intel_pmt_entry		entry[];
+};
+
+static bool pmt_telem_region_overlaps(struct intel_pmt_entry *entry,
+				      struct device *dev)
+{
+	u32 guid = readl(entry->disc_table + TELEM_GUID_OFFSET);
+
+	if (intel_pmt_is_early_client_hw(dev)) {
+		u32 type = TELEM_TYPE(readl(entry->disc_table));
+
+		if ((type == TELEM_TYPE_PUNIT_FIXED) ||
+		    (guid == TELEM_CLIENT_FIXED_BLOCK_GUID))
+			return true;
+	}
+
+	return false;
+}
+
+static int pmt_telem_header_decode(struct intel_pmt_entry *entry,
+				   struct intel_pmt_header *header,
+				   struct device *dev)
+{
+	void __iomem *disc_table = entry->disc_table;
+
+	if (pmt_telem_region_overlaps(entry, dev))
+		return 1;
+
+	header->access_type = TELEM_ACCESS(readl(disc_table));
+	header->guid = readl(disc_table + TELEM_GUID_OFFSET);
+	header->base_offset = readl(disc_table + TELEM_BASE_OFFSET);
+
+	/* Size is measured in DWORDS, but accessor returns bytes */
+	header->size = TELEM_SIZE(readl(disc_table));
+
+	/*
+	 * Some devices may expose non-functioning entries that are
+	 * reserved for future use. They have zero size. Do not fail
+	 * probe for these. Just ignore them.
+	 */
+	if (header->size == 0)
+		return 1;
+
+	return 0;
+}
+
+static DEFINE_XARRAY_ALLOC(telem_array);
+static struct intel_pmt_namespace pmt_telem_ns = {
+	.name = "telem",
+	.xa = &telem_array,
+	.pmt_header_decode = pmt_telem_header_decode,
+};
+
+static void pmt_telem_remove(struct auxiliary_device *auxdev)
+{
+	struct pmt_telem_priv *priv = auxiliary_get_drvdata(auxdev);
+	int i;
+
+	for (i = 0; i < priv->num_entries; i++)
+		intel_pmt_dev_destroy(&priv->entry[i], &pmt_telem_ns);
+}
+
+static int pmt_telem_probe(struct auxiliary_device *auxdev, const struct auxiliary_device_id *id)
+{
+	struct intel_vsec_device *intel_vsec_dev = auxdev_to_ivdev(auxdev);
+	struct pmt_telem_priv *priv;
+	size_t size;
+	int i, ret;
+
+	size = struct_size(priv, entry, intel_vsec_dev->num_resources);
+	priv = devm_kzalloc(&auxdev->dev, size, GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	auxiliary_set_drvdata(auxdev, priv);
+
+	for (i = 0; i < intel_vsec_dev->num_resources; i++) {
+		struct intel_pmt_entry *entry = &priv->entry[priv->num_entries];
+
+		ret = intel_pmt_dev_create(entry, &pmt_telem_ns, intel_vsec_dev, i);
+		if (ret < 0)
+			goto abort_probe;
+		if (ret)
+			continue;
+
+		priv->num_entries++;
+	}
+
+	return 0;
+abort_probe:
+	pmt_telem_remove(auxdev);
+	return ret;
+}
+
+static const struct auxiliary_device_id pmt_telem_id_table[] = {
+	{ .name = "intel_vsec.telemetry" },
+	{}
+};
+MODULE_DEVICE_TABLE(auxiliary, pmt_telem_id_table);
+
+static struct auxiliary_driver pmt_telem_aux_driver = {
+	.id_table	= pmt_telem_id_table,
+	.remove		= pmt_telem_remove,
+	.probe		= pmt_telem_probe,
+};
+
+static int __init pmt_telem_init(void)
+{
+	return auxiliary_driver_register(&pmt_telem_aux_driver);
+}
+module_init(pmt_telem_init);
+
+static void __exit pmt_telem_exit(void)
+{
+	auxiliary_driver_unregister(&pmt_telem_aux_driver);
+	xa_destroy(&telem_array);
+}
+module_exit(pmt_telem_exit);
+
+MODULE_AUTHOR("David E. Box <david.e.box@linux.intel.com>");
+MODULE_DESCRIPTION("Intel PMT Telemetry driver");
+MODULE_LICENSE("GPL v2");