149 lines
3.4 KiB
C
149 lines
3.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Intel Platform Monitory Technology Telemetry driver
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*
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* Copyright (c) 2020, Intel Corporation.
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* All Rights Reserved.
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*
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* Author: "David E. Box" <david.e.box@linux.intel.com>
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/pci.h>
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#include <linux/slab.h>
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#include <linux/uaccess.h>
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#include <linux/overflow.h>
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#include "class.h"
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#define TELEM_DEV_NAME "pmt_telemetry"
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#define TELEM_SIZE_OFFSET 0x0
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#define TELEM_GUID_OFFSET 0x4
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#define TELEM_BASE_OFFSET 0x8
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#define TELEM_ACCESS(v) ((v) & GENMASK(3, 0))
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/* size is in bytes */
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#define TELEM_SIZE(v) (((v) & GENMASK(27, 12)) >> 10)
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/* Used by client hardware to identify a fixed telemetry entry*/
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#define TELEM_CLIENT_FIXED_BLOCK_GUID 0x10000000
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struct pmt_telem_priv {
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int num_entries;
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struct intel_pmt_entry entry[];
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};
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static bool pmt_telem_region_overlaps(struct intel_pmt_entry *entry,
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struct device *dev)
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{
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u32 guid = readl(entry->disc_table + TELEM_GUID_OFFSET);
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if (guid != TELEM_CLIENT_FIXED_BLOCK_GUID)
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return false;
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return intel_pmt_is_early_client_hw(dev);
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}
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static int pmt_telem_header_decode(struct intel_pmt_entry *entry,
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struct intel_pmt_header *header,
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struct device *dev)
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{
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void __iomem *disc_table = entry->disc_table;
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if (pmt_telem_region_overlaps(entry, dev))
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return 1;
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header->access_type = TELEM_ACCESS(readl(disc_table));
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header->guid = readl(disc_table + TELEM_GUID_OFFSET);
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header->base_offset = readl(disc_table + TELEM_BASE_OFFSET);
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/* Size is measured in DWORDS, but accessor returns bytes */
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header->size = TELEM_SIZE(readl(disc_table));
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/*
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* Some devices may expose non-functioning entries that are
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* reserved for future use. They have zero size. Do not fail
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* probe for these. Just ignore them.
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*/
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if (header->size == 0)
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return 1;
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return 0;
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}
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static DEFINE_XARRAY_ALLOC(telem_array);
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static struct intel_pmt_namespace pmt_telem_ns = {
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.name = "telem",
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.xa = &telem_array,
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.pmt_header_decode = pmt_telem_header_decode,
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};
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static int pmt_telem_remove(struct platform_device *pdev)
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{
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struct pmt_telem_priv *priv = platform_get_drvdata(pdev);
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int i;
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for (i = 0; i < priv->num_entries; i++)
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intel_pmt_dev_destroy(&priv->entry[i], &pmt_telem_ns);
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return 0;
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}
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static int pmt_telem_probe(struct platform_device *pdev)
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{
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struct pmt_telem_priv *priv;
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size_t size;
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int i, ret;
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size = struct_size(priv, entry, pdev->num_resources);
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priv = devm_kzalloc(&pdev->dev, size, GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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platform_set_drvdata(pdev, priv);
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for (i = 0; i < pdev->num_resources; i++) {
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struct intel_pmt_entry *entry = &priv->entry[i];
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ret = intel_pmt_dev_create(entry, &pmt_telem_ns, pdev, i);
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if (ret < 0)
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goto abort_probe;
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if (ret)
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continue;
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priv->num_entries++;
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}
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return 0;
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abort_probe:
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pmt_telem_remove(pdev);
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return ret;
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}
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static struct platform_driver pmt_telem_driver = {
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.driver = {
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.name = TELEM_DEV_NAME,
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},
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.remove = pmt_telem_remove,
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.probe = pmt_telem_probe,
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};
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static int __init pmt_telem_init(void)
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{
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return platform_driver_register(&pmt_telem_driver);
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}
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module_init(pmt_telem_init);
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static void __exit pmt_telem_exit(void)
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{
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platform_driver_unregister(&pmt_telem_driver);
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xa_destroy(&telem_array);
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}
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module_exit(pmt_telem_exit);
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MODULE_AUTHOR("David E. Box <david.e.box@linux.intel.com>");
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MODULE_DESCRIPTION("Intel PMT Telemetry driver");
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MODULE_ALIAS("platform:" TELEM_DEV_NAME);
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MODULE_LICENSE("GPL v2");
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