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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legacy.c (1738B)

      1// SPDX-License-Identifier: GPL-2.0
      2/*
      3 * PCI Message Signaled Interrupt (MSI).
      4 *
      5 * Legacy architecture specific setup and teardown mechanism.
      6 */
      7#include "msi.h"
      8
      9/* Arch hooks */
     10int __weak arch_setup_msi_irq(struct pci_dev *dev, struct msi_desc *desc)
     11{
     12	return -EINVAL;
     13}
     14
     15void __weak arch_teardown_msi_irq(unsigned int irq)
     16{
     17}
     18
     19int __weak arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
     20{
     21	struct msi_desc *desc;
     22	int ret;
     23
     24	/*
     25	 * If an architecture wants to support multiple MSI, it needs to
     26	 * override arch_setup_msi_irqs()
     27	 */
     28	if (type == PCI_CAP_ID_MSI && nvec > 1)
     29		return 1;
     30
     31	msi_for_each_desc(desc, &dev->dev, MSI_DESC_NOTASSOCIATED) {
     32		ret = arch_setup_msi_irq(dev, desc);
     33		if (ret)
     34			return ret < 0 ? ret : -ENOSPC;
     35	}
     36
     37	return 0;
     38}
     39
     40void __weak arch_teardown_msi_irqs(struct pci_dev *dev)
     41{
     42	struct msi_desc *desc;
     43	int i;
     44
     45	msi_for_each_desc(desc, &dev->dev, MSI_DESC_ASSOCIATED) {
     46		for (i = 0; i < desc->nvec_used; i++)
     47			arch_teardown_msi_irq(desc->irq + i);
     48	}
     49}
     50
     51static int pci_msi_setup_check_result(struct pci_dev *dev, int type, int ret)
     52{
     53	struct msi_desc *desc;
     54	int avail = 0;
     55
     56	if (type != PCI_CAP_ID_MSIX || ret >= 0)
     57		return ret;
     58
     59	/* Scan the MSI descriptors for successfully allocated ones. */
     60	msi_for_each_desc(desc, &dev->dev, MSI_DESC_ASSOCIATED)
     61		avail++;
     62
     63	return avail ? avail : ret;
     64}
     65
     66int pci_msi_legacy_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
     67{
     68	int ret = arch_setup_msi_irqs(dev, nvec, type);
     69
     70	ret = pci_msi_setup_check_result(dev, type, ret);
     71	if (!ret)
     72		ret = msi_device_populate_sysfs(&dev->dev);
     73	return ret;
     74}
     75
     76void pci_msi_legacy_teardown_msi_irqs(struct pci_dev *dev)
     77{
     78	msi_device_destroy_sysfs(&dev->dev);
     79	arch_teardown_msi_irqs(dev);
     80}