cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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pvpanic-pci.c (2496B)

      1// SPDX-License-Identifier: GPL-2.0+
      2/*
      3 *  Pvpanic PCI Device Support
      4 *
      5 *  Copyright (C) 2021 Oracle.
      6 */
      7
      8#include <linux/kernel.h>
      9#include <linux/module.h>
     10#include <linux/pci.h>
     11#include <linux/types.h>
     12#include <linux/slab.h>
     13
     14#include <uapi/misc/pvpanic.h>
     15
     16#include "pvpanic.h"
     17
     18#define PCI_VENDOR_ID_REDHAT             0x1b36
     19#define PCI_DEVICE_ID_REDHAT_PVPANIC     0x0011
     20
     21MODULE_AUTHOR("Mihai Carabas <mihai.carabas@oracle.com>");
     22MODULE_DESCRIPTION("pvpanic device driver");
     23MODULE_LICENSE("GPL");
     24
     25static ssize_t capability_show(struct device *dev, struct device_attribute *attr, char *buf)
     26{
     27	struct pvpanic_instance *pi = dev_get_drvdata(dev);
     28
     29	return sysfs_emit(buf, "%x\n", pi->capability);
     30}
     31static DEVICE_ATTR_RO(capability);
     32
     33static ssize_t events_show(struct device *dev, struct device_attribute *attr, char *buf)
     34{
     35	struct pvpanic_instance *pi = dev_get_drvdata(dev);
     36
     37	return sysfs_emit(buf, "%x\n", pi->events);
     38}
     39
     40static ssize_t events_store(struct device *dev, struct device_attribute *attr,
     41			    const char *buf, size_t count)
     42{
     43	struct pvpanic_instance *pi = dev_get_drvdata(dev);
     44	unsigned int tmp;
     45	int err;
     46
     47	err = kstrtouint(buf, 16, &tmp);
     48	if (err)
     49		return err;
     50
     51	if ((tmp & pi->capability) != tmp)
     52		return -EINVAL;
     53
     54	pi->events = tmp;
     55
     56	return count;
     57}
     58static DEVICE_ATTR_RW(events);
     59
     60static struct attribute *pvpanic_pci_dev_attrs[] = {
     61	&dev_attr_capability.attr,
     62	&dev_attr_events.attr,
     63	NULL
     64};
     65ATTRIBUTE_GROUPS(pvpanic_pci_dev);
     66
     67static int pvpanic_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
     68{
     69	struct pvpanic_instance *pi;
     70	void __iomem *base;
     71	int ret;
     72
     73	ret = pcim_enable_device(pdev);
     74	if (ret < 0)
     75		return ret;
     76
     77	base = pcim_iomap(pdev, 0, 0);
     78	if (!base)
     79		return -ENOMEM;
     80
     81	pi = devm_kmalloc(&pdev->dev, sizeof(*pi), GFP_KERNEL);
     82	if (!pi)
     83		return -ENOMEM;
     84
     85	pi->base = base;
     86	pi->capability = PVPANIC_PANICKED | PVPANIC_CRASH_LOADED;
     87
     88	/* initlize capability by RDPT */
     89	pi->capability &= ioread8(base);
     90	pi->events = pi->capability;
     91
     92	return devm_pvpanic_probe(&pdev->dev, pi);
     93}
     94
     95static const struct pci_device_id pvpanic_pci_id_tbl[]  = {
     96	{ PCI_DEVICE(PCI_VENDOR_ID_REDHAT, PCI_DEVICE_ID_REDHAT_PVPANIC)},
     97	{}
     98};
     99MODULE_DEVICE_TABLE(pci, pvpanic_pci_id_tbl);
    100
    101static struct pci_driver pvpanic_pci_driver = {
    102	.name =         "pvpanic-pci",
    103	.id_table =     pvpanic_pci_id_tbl,
    104	.probe =        pvpanic_pci_probe,
    105	.driver = {
    106		.dev_groups = pvpanic_pci_dev_groups,
    107	},
    108};
    109module_pci_driver(pvpanic_pci_driver);