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150 lines
3.7 KiB
150 lines
3.7 KiB
// 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" <[email protected]> |
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*/ |
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#include <linux/auxiliary_bus.h> |
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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 "../vsec.h" |
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#include "class.h" |
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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 void pmt_telem_remove(struct auxiliary_device *auxdev) |
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{ |
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struct pmt_telem_priv *priv = auxiliary_get_drvdata(auxdev); |
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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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} |
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static int pmt_telem_probe(struct auxiliary_device *auxdev, const struct auxiliary_device_id *id) |
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{ |
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struct intel_vsec_device *intel_vsec_dev = auxdev_to_ivdev(auxdev); |
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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, intel_vsec_dev->num_resources); |
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priv = devm_kzalloc(&auxdev->dev, size, GFP_KERNEL); |
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if (!priv) |
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return -ENOMEM; |
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auxiliary_set_drvdata(auxdev, priv); |
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for (i = 0; i < intel_vsec_dev->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, intel_vsec_dev, 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(auxdev); |
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return ret; |
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} |
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static const struct auxiliary_device_id pmt_telem_id_table[] = { |
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{ .name = "intel_vsec.telemetry" }, |
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{} |
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}; |
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MODULE_DEVICE_TABLE(auxiliary, pmt_telem_id_table); |
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static struct auxiliary_driver pmt_telem_aux_driver = { |
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.id_table = pmt_telem_id_table, |
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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 auxiliary_driver_register(&pmt_telem_aux_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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auxiliary_driver_unregister(&pmt_telem_aux_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 <[email protected]>"); |
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MODULE_DESCRIPTION("Intel PMT Telemetry driver"); |
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MODULE_LICENSE("GPL v2");
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