0e4ccb1505
Certain platforms do not allow writes in the MSI-X BARs to setup or tear down vector values. To combat against the generic code trying to write to that and either silently being ignored or crashing due to the pagetables being marked R/O this patch introduces a platform override. Note that we keep two separate, non-weak, functions default_mask_msi_irqs() and default_mask_msix_irqs() for the behavior of the arch_mask_msi_irqs() and arch_mask_msix_irqs(), as the default behavior is needed by x86 PCI code. For Xen, which does not allow the guest to write to MSI-X tables - as the hypervisor is solely responsible for setting the vector values - we implement two nops. This fixes a Xen guest crash when passing a PCI device with MSI-X to the guest. See the bugzilla for more details. [bhelgaas: add bugzilla info] Reference: https://bugzilla.kernel.org/show_bug.cgi?id=64581 Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> CC: Sucheta Chakraborty <sucheta.chakraborty@qlogic.com> CC: Zhenzhong Duan <zhenzhong.duan@oracle.com>
84 lines
2.6 KiB
C
84 lines
2.6 KiB
C
#ifndef LINUX_MSI_H
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#define LINUX_MSI_H
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#include <linux/kobject.h>
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#include <linux/list.h>
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struct msi_msg {
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u32 address_lo; /* low 32 bits of msi message address */
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u32 address_hi; /* high 32 bits of msi message address */
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u32 data; /* 16 bits of msi message data */
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};
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/* Helper functions */
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struct irq_data;
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struct msi_desc;
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void mask_msi_irq(struct irq_data *data);
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void unmask_msi_irq(struct irq_data *data);
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void __read_msi_msg(struct msi_desc *entry, struct msi_msg *msg);
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void __get_cached_msi_msg(struct msi_desc *entry, struct msi_msg *msg);
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void __write_msi_msg(struct msi_desc *entry, struct msi_msg *msg);
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void read_msi_msg(unsigned int irq, struct msi_msg *msg);
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void get_cached_msi_msg(unsigned int irq, struct msi_msg *msg);
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void write_msi_msg(unsigned int irq, struct msi_msg *msg);
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struct msi_desc {
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struct {
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__u8 is_msix : 1;
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__u8 multiple: 3; /* log2 number of messages */
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__u8 maskbit : 1; /* mask-pending bit supported ? */
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__u8 is_64 : 1; /* Address size: 0=32bit 1=64bit */
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__u8 pos; /* Location of the msi capability */
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__u16 entry_nr; /* specific enabled entry */
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unsigned default_irq; /* default pre-assigned irq */
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} msi_attrib;
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u32 masked; /* mask bits */
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unsigned int irq;
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unsigned int nvec_used; /* number of messages */
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struct list_head list;
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union {
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void __iomem *mask_base;
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u8 mask_pos;
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};
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struct pci_dev *dev;
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/* Last set MSI message */
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struct msi_msg msg;
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struct kobject kobj;
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};
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/*
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* The arch hooks to setup up msi irqs. Those functions are
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* implemented as weak symbols so that they /can/ be overriden by
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* architecture specific code if needed.
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*/
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int arch_setup_msi_irq(struct pci_dev *dev, struct msi_desc *desc);
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void arch_teardown_msi_irq(unsigned int irq);
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int arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type);
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void arch_teardown_msi_irqs(struct pci_dev *dev);
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int arch_msi_check_device(struct pci_dev* dev, int nvec, int type);
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void arch_restore_msi_irqs(struct pci_dev *dev, int irq);
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void default_teardown_msi_irqs(struct pci_dev *dev);
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void default_restore_msi_irqs(struct pci_dev *dev, int irq);
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u32 default_msi_mask_irq(struct msi_desc *desc, u32 mask, u32 flag);
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u32 default_msix_mask_irq(struct msi_desc *desc, u32 flag);
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struct msi_chip {
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struct module *owner;
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struct device *dev;
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struct device_node *of_node;
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struct list_head list;
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int (*setup_irq)(struct msi_chip *chip, struct pci_dev *dev,
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struct msi_desc *desc);
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void (*teardown_irq)(struct msi_chip *chip, unsigned int irq);
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int (*check_device)(struct msi_chip *chip, struct pci_dev *dev,
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int nvec, int type);
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};
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#endif /* LINUX_MSI_H */
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