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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pci-host-common.c (2318B)

      1// SPDX-License-Identifier: GPL-2.0
      2/*
      3 * Generic PCI host driver common code
      4 *
      5 * Copyright (C) 2014 ARM Limited
      6 *
      7 * Author: Will Deacon <will.deacon@arm.com>
      8 */
      9
     10#include <linux/kernel.h>
     11#include <linux/module.h>
     12#include <linux/of_address.h>
     13#include <linux/of_device.h>
     14#include <linux/of_pci.h>
     15#include <linux/pci-ecam.h>
     16#include <linux/platform_device.h>
     17
     18static void gen_pci_unmap_cfg(void *ptr)
     19{
     20	pci_ecam_free((struct pci_config_window *)ptr);
     21}
     22
     23static struct pci_config_window *gen_pci_init(struct device *dev,
     24		struct pci_host_bridge *bridge, const struct pci_ecam_ops *ops)
     25{
     26	int err;
     27	struct resource cfgres;
     28	struct resource_entry *bus;
     29	struct pci_config_window *cfg;
     30
     31	err = of_address_to_resource(dev->of_node, 0, &cfgres);
     32	if (err) {
     33		dev_err(dev, "missing \"reg\" property\n");
     34		return ERR_PTR(err);
     35	}
     36
     37	bus = resource_list_first_type(&bridge->windows, IORESOURCE_BUS);
     38	if (!bus)
     39		return ERR_PTR(-ENODEV);
     40
     41	cfg = pci_ecam_create(dev, &cfgres, bus->res, ops);
     42	if (IS_ERR(cfg))
     43		return cfg;
     44
     45	err = devm_add_action_or_reset(dev, gen_pci_unmap_cfg, cfg);
     46	if (err)
     47		return ERR_PTR(err);
     48
     49	return cfg;
     50}
     51
     52int pci_host_common_probe(struct platform_device *pdev)
     53{
     54	struct device *dev = &pdev->dev;
     55	struct pci_host_bridge *bridge;
     56	struct pci_config_window *cfg;
     57	const struct pci_ecam_ops *ops;
     58
     59	ops = of_device_get_match_data(&pdev->dev);
     60	if (!ops)
     61		return -ENODEV;
     62
     63	bridge = devm_pci_alloc_host_bridge(dev, 0);
     64	if (!bridge)
     65		return -ENOMEM;
     66
     67	platform_set_drvdata(pdev, bridge);
     68
     69	of_pci_check_probe_only();
     70
     71	/* Parse and map our Configuration Space windows */
     72	cfg = gen_pci_init(dev, bridge, ops);
     73	if (IS_ERR(cfg))
     74		return PTR_ERR(cfg);
     75
     76	/* Do not reassign resources if probe only */
     77	if (!pci_has_flag(PCI_PROBE_ONLY))
     78		pci_add_flags(PCI_REASSIGN_ALL_BUS);
     79
     80	bridge->sysdata = cfg;
     81	bridge->ops = (struct pci_ops *)&ops->pci_ops;
     82	bridge->msi_domain = true;
     83
     84	return pci_host_probe(bridge);
     85}
     86EXPORT_SYMBOL_GPL(pci_host_common_probe);
     87
     88int pci_host_common_remove(struct platform_device *pdev)
     89{
     90	struct pci_host_bridge *bridge = platform_get_drvdata(pdev);
     91
     92	pci_lock_rescan_remove();
     93	pci_stop_root_bus(bridge->bus);
     94	pci_remove_root_bus(bridge->bus);
     95	pci_unlock_rescan_remove();
     96
     97	return 0;
     98}
     99EXPORT_SYMBOL_GPL(pci_host_common_remove);
    100
    101MODULE_LICENSE("GPL v2");