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https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
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1c3b002c6b
Implement the doorbell feature by mapping the EP's MSI interrupt controller message address to a dedicated BAR. The EPF driver should pass the actual message data to be written to the message address by the host through implementation-specific logic. Signed-off-by: Frank Li <Frank.Li@nxp.com> [mani: minor code cleanups and reworded commit message] Signed-off-by: Manivannan Sadhasivam <mani@kernel.org> [bhelgaas: fix kernel-doc] Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Tested-by: Niklas Cassel <cassel@kernel.org> Link: https://patch.msgid.link/20250710-ep-msi-v21-3-57683fc7fb25@nxp.com
29 lines
607 B
C
29 lines
607 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* PCI Endpoint *Function* side MSI header file
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*
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* Copyright (C) 2024 NXP
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* Author: Frank Li <Frank.Li@nxp.com>
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*/
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#ifndef __PCI_EP_MSI__
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#define __PCI_EP_MSI__
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struct pci_epf;
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#ifdef CONFIG_PCI_ENDPOINT_MSI_DOORBELL
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int pci_epf_alloc_doorbell(struct pci_epf *epf, u16 nums);
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void pci_epf_free_doorbell(struct pci_epf *epf);
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#else
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static inline int pci_epf_alloc_doorbell(struct pci_epf *epf, u16 nums)
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{
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return -ENODATA;
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}
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static inline void pci_epf_free_doorbell(struct pci_epf *epf)
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{
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}
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#endif /* CONFIG_GENERIC_MSI_IRQ */
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#endif /* __PCI_EP_MSI__ */
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