forked from Minki/linux
aa47ad3f85
Adds PMT Telemetry aggregator support for the DG1 graphics PCIe card. The device does not have the DVSEC region in its PCI config space so hard code the discovery table data in the driver. Also requires a fix for DG1 in the Telemetry driver for how the ACCESS_TYPE field is used. Signed-off-by: David E. Box <david.e.box@linux.intel.com> Reviewed-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Lee Jones <lee.jones@linaro.org>
141 lines
3.2 KiB
C
141 lines
3.2 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 "intel_pmt_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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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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