81 lines
1.7 KiB
C
81 lines
1.7 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* PCI Message Signaled Interrupt (MSI).
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*
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* Legacy architecture specific setup and teardown mechanism.
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*/
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#include "msi.h"
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/* Arch hooks */
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int __weak arch_setup_msi_irq(struct pci_dev *dev, struct msi_desc *desc)
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{
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return -EINVAL;
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}
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void __weak arch_teardown_msi_irq(unsigned int irq)
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{
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}
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int __weak arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
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{
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struct msi_desc *desc;
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int ret;
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/*
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* If an architecture wants to support multiple MSI, it needs to
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* override arch_setup_msi_irqs()
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*/
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if (type == PCI_CAP_ID_MSI && nvec > 1)
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return 1;
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msi_for_each_desc(desc, &dev->dev, MSI_DESC_NOTASSOCIATED) {
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ret = arch_setup_msi_irq(dev, desc);
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if (ret)
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return ret < 0 ? ret : -ENOSPC;
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}
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return 0;
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}
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void __weak arch_teardown_msi_irqs(struct pci_dev *dev)
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{
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struct msi_desc *desc;
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int i;
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msi_for_each_desc(desc, &dev->dev, MSI_DESC_ASSOCIATED) {
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for (i = 0; i < desc->nvec_used; i++)
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arch_teardown_msi_irq(desc->irq + i);
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}
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}
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static int pci_msi_setup_check_result(struct pci_dev *dev, int type, int ret)
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{
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struct msi_desc *desc;
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int avail = 0;
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if (type != PCI_CAP_ID_MSIX || ret >= 0)
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return ret;
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/* Scan the MSI descriptors for successfully allocated ones. */
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msi_for_each_desc(desc, &dev->dev, MSI_DESC_ASSOCIATED)
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avail++;
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return avail ? avail : ret;
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}
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int pci_msi_legacy_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
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{
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int ret = arch_setup_msi_irqs(dev, nvec, type);
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ret = pci_msi_setup_check_result(dev, type, ret);
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if (!ret)
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ret = msi_device_populate_sysfs(&dev->dev);
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return ret;
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}
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void pci_msi_legacy_teardown_msi_irqs(struct pci_dev *dev)
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{
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msi_device_destroy_sysfs(&dev->dev);
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arch_teardown_msi_irqs(dev);
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}
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