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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shpchp_pci.c (2065B)

      1// SPDX-License-Identifier: GPL-2.0+
      2/*
      3 * Standard Hot Plug Controller Driver
      4 *
      5 * Copyright (C) 1995,2001 Compaq Computer Corporation
      6 * Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com)
      7 * Copyright (C) 2001 IBM Corp.
      8 * Copyright (C) 2003-2004 Intel Corporation
      9 *
     10 * All rights reserved.
     11 *
     12 * Send feedback to <greg@kroah.com>, <kristen.c.accardi@intel.com>
     13 *
     14 */
     15
     16#include <linux/module.h>
     17#include <linux/kernel.h>
     18#include <linux/types.h>
     19#include <linux/pci.h>
     20#include "../pci.h"
     21#include "shpchp.h"
     22
     23int shpchp_configure_device(struct slot *p_slot)
     24{
     25	struct pci_dev *dev;
     26	struct controller *ctrl = p_slot->ctrl;
     27	struct pci_dev *bridge = ctrl->pci_dev;
     28	struct pci_bus *parent = bridge->subordinate;
     29	int num, ret = 0;
     30
     31	pci_lock_rescan_remove();
     32
     33	dev = pci_get_slot(parent, PCI_DEVFN(p_slot->device, 0));
     34	if (dev) {
     35		ctrl_err(ctrl, "Device %s already exists at %04x:%02x:%02x, cannot hot-add\n",
     36			 pci_name(dev), pci_domain_nr(parent),
     37			 p_slot->bus, p_slot->device);
     38		pci_dev_put(dev);
     39		ret = -EINVAL;
     40		goto out;
     41	}
     42
     43	num = pci_scan_slot(parent, PCI_DEVFN(p_slot->device, 0));
     44	if (num == 0) {
     45		ctrl_err(ctrl, "No new device found\n");
     46		ret = -ENODEV;
     47		goto out;
     48	}
     49
     50	for_each_pci_bridge(dev, parent) {
     51		if (PCI_SLOT(dev->devfn) == p_slot->device)
     52			pci_hp_add_bridge(dev);
     53	}
     54
     55	pci_assign_unassigned_bridge_resources(bridge);
     56	pcie_bus_configure_settings(parent);
     57	pci_bus_add_devices(parent);
     58
     59 out:
     60	pci_unlock_rescan_remove();
     61	return ret;
     62}
     63
     64void shpchp_unconfigure_device(struct slot *p_slot)
     65{
     66	struct pci_bus *parent = p_slot->ctrl->pci_dev->subordinate;
     67	struct pci_dev *dev, *temp;
     68	struct controller *ctrl = p_slot->ctrl;
     69
     70	ctrl_dbg(ctrl, "%s: domain:bus:dev = %04x:%02x:%02x\n",
     71		 __func__, pci_domain_nr(parent), p_slot->bus, p_slot->device);
     72
     73	pci_lock_rescan_remove();
     74
     75	list_for_each_entry_safe(dev, temp, &parent->devices, bus_list) {
     76		if (PCI_SLOT(dev->devfn) != p_slot->device)
     77			continue;
     78
     79		pci_dev_get(dev);
     80		pci_stop_and_remove_bus_device(dev);
     81		pci_dev_put(dev);
     82	}
     83
     84	pci_unlock_rescan_remove();
     85}