494 lines
16 KiB
C
494 lines
16 KiB
C
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/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef LINUX_MSI_H
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#define LINUX_MSI_H
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/*
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* This header file contains MSI data structures and functions which are
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* only relevant for:
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* - Interrupt core code
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* - PCI/MSI core code
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* - MSI interrupt domain implementations
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* - IOMMU, low level VFIO, NTB and other justified exceptions
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* dealing with low level MSI details.
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*
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* Regular device drivers have no business with any of these functions and
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* especially storing MSI descriptor pointers in random code is considered
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* abuse. The only function which is relevant for drivers is msi_get_virq().
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*/
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#include <linux/cpumask.h>
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#include <linux/xarray.h>
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#include <linux/mutex.h>
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#include <linux/list.h>
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#include <asm/msi.h>
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/* Dummy shadow structures if an architecture does not define them */
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#ifndef arch_msi_msg_addr_lo
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typedef struct arch_msi_msg_addr_lo {
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u32 address_lo;
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} __attribute__ ((packed)) arch_msi_msg_addr_lo_t;
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#endif
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#ifndef arch_msi_msg_addr_hi
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typedef struct arch_msi_msg_addr_hi {
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u32 address_hi;
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} __attribute__ ((packed)) arch_msi_msg_addr_hi_t;
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#endif
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#ifndef arch_msi_msg_data
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typedef struct arch_msi_msg_data {
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u32 data;
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} __attribute__ ((packed)) arch_msi_msg_data_t;
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#endif
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/**
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* msi_msg - Representation of a MSI message
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* @address_lo: Low 32 bits of msi message address
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* @arch_addrlo: Architecture specific shadow of @address_lo
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* @address_hi: High 32 bits of msi message address
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* (only used when device supports it)
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* @arch_addrhi: Architecture specific shadow of @address_hi
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* @data: MSI message data (usually 16 bits)
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* @arch_data: Architecture specific shadow of @data
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*/
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struct msi_msg {
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union {
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u32 address_lo;
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arch_msi_msg_addr_lo_t arch_addr_lo;
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};
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union {
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u32 address_hi;
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arch_msi_msg_addr_hi_t arch_addr_hi;
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};
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union {
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u32 data;
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arch_msi_msg_data_t arch_data;
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};
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};
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extern int pci_msi_ignore_mask;
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/* Helper functions */
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struct irq_data;
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struct msi_desc;
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struct pci_dev;
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struct platform_msi_priv_data;
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struct device_attribute;
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void __get_cached_msi_msg(struct msi_desc *entry, struct msi_msg *msg);
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#ifdef CONFIG_GENERIC_MSI_IRQ
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void get_cached_msi_msg(unsigned int irq, struct msi_msg *msg);
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#else
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static inline void get_cached_msi_msg(unsigned int irq, struct msi_msg *msg)
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{
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}
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#endif
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typedef void (*irq_write_msi_msg_t)(struct msi_desc *desc,
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struct msi_msg *msg);
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/**
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* pci_msi_desc - PCI/MSI specific MSI descriptor data
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*
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* @msi_mask: [PCI MSI] MSI cached mask bits
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* @msix_ctrl: [PCI MSI-X] MSI-X cached per vector control bits
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* @is_msix: [PCI MSI/X] True if MSI-X
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* @multiple: [PCI MSI/X] log2 num of messages allocated
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* @multi_cap: [PCI MSI/X] log2 num of messages supported
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* @can_mask: [PCI MSI/X] Masking supported?
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* @is_64: [PCI MSI/X] Address size: 0=32bit 1=64bit
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* @default_irq:[PCI MSI/X] The default pre-assigned non-MSI irq
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* @mask_pos: [PCI MSI] Mask register position
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* @mask_base: [PCI MSI-X] Mask register base address
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*/
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struct pci_msi_desc {
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union {
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u32 msi_mask;
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u32 msix_ctrl;
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};
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struct {
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u8 is_msix : 1;
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u8 multiple : 3;
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u8 multi_cap : 3;
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u8 can_mask : 1;
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u8 is_64 : 1;
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u8 is_virtual : 1;
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unsigned default_irq;
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} msi_attrib;
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union {
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u8 mask_pos;
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void __iomem *mask_base;
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};
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};
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#define MSI_MAX_INDEX ((unsigned int)USHRT_MAX)
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/**
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* struct msi_desc - Descriptor structure for MSI based interrupts
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* @irq: The base interrupt number
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* @nvec_used: The number of vectors used
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* @dev: Pointer to the device which uses this descriptor
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* @msg: The last set MSI message cached for reuse
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* @affinity: Optional pointer to a cpu affinity mask for this descriptor
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* @sysfs_attr: Pointer to sysfs device attribute
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*
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* @write_msi_msg: Callback that may be called when the MSI message
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* address or data changes
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* @write_msi_msg_data: Data parameter for the callback.
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*
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* @msi_index: Index of the msi descriptor
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* @pci: PCI specific msi descriptor data
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*/
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struct msi_desc {
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/* Shared device/bus type independent data */
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unsigned int irq;
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unsigned int nvec_used;
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struct device *dev;
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struct msi_msg msg;
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struct irq_affinity_desc *affinity;
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#ifdef CONFIG_IRQ_MSI_IOMMU
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const void *iommu_cookie;
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#endif
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#ifdef CONFIG_SYSFS
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struct device_attribute *sysfs_attrs;
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#endif
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void (*write_msi_msg)(struct msi_desc *entry, void *data);
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void *write_msi_msg_data;
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u16 msi_index;
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struct pci_msi_desc pci;
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};
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/*
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* Filter values for the MSI descriptor iterators and accessor functions.
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*/
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enum msi_desc_filter {
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/* All descriptors */
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MSI_DESC_ALL,
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/* Descriptors which have no interrupt associated */
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MSI_DESC_NOTASSOCIATED,
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/* Descriptors which have an interrupt associated */
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MSI_DESC_ASSOCIATED,
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};
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/**
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* msi_device_data - MSI per device data
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* @properties: MSI properties which are interesting to drivers
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* @platform_data: Platform-MSI specific data
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* @mutex: Mutex protecting the MSI descriptor store
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* @__store: Xarray for storing MSI descriptor pointers
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* @__iter_idx: Index to search the next entry for iterators
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*/
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struct msi_device_data {
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unsigned long properties;
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struct platform_msi_priv_data *platform_data;
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struct mutex mutex;
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struct xarray __store;
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unsigned long __iter_idx;
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};
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int msi_setup_device_data(struct device *dev);
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unsigned int msi_get_virq(struct device *dev, unsigned int index);
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void msi_lock_descs(struct device *dev);
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void msi_unlock_descs(struct device *dev);
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struct msi_desc *msi_first_desc(struct device *dev, enum msi_desc_filter filter);
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struct msi_desc *msi_next_desc(struct device *dev, enum msi_desc_filter filter);
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/**
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* msi_for_each_desc - Iterate the MSI descriptors
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*
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* @desc: struct msi_desc pointer used as iterator
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* @dev: struct device pointer - device to iterate
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* @filter: Filter for descriptor selection
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*
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* Notes:
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* - The loop must be protected with a msi_lock_descs()/msi_unlock_descs()
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* pair.
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* - It is safe to remove a retrieved MSI descriptor in the loop.
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*/
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#define msi_for_each_desc(desc, dev, filter) \
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for ((desc) = msi_first_desc((dev), (filter)); (desc); \
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(desc) = msi_next_desc((dev), (filter)))
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#define msi_desc_to_dev(desc) ((desc)->dev)
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#ifdef CONFIG_IRQ_MSI_IOMMU
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static inline const void *msi_desc_get_iommu_cookie(struct msi_desc *desc)
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{
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return desc->iommu_cookie;
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}
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static inline void msi_desc_set_iommu_cookie(struct msi_desc *desc,
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const void *iommu_cookie)
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{
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desc->iommu_cookie = iommu_cookie;
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}
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#else
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static inline const void *msi_desc_get_iommu_cookie(struct msi_desc *desc)
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{
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return NULL;
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}
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static inline void msi_desc_set_iommu_cookie(struct msi_desc *desc,
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const void *iommu_cookie)
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{
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}
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#endif
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#ifdef CONFIG_PCI_MSI
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struct pci_dev *msi_desc_to_pci_dev(struct msi_desc *desc);
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void pci_write_msi_msg(unsigned int irq, struct msi_msg *msg);
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#else /* CONFIG_PCI_MSI */
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static inline void pci_write_msi_msg(unsigned int irq, struct msi_msg *msg)
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{
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}
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#endif /* CONFIG_PCI_MSI */
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int msi_add_msi_desc(struct device *dev, struct msi_desc *init_desc);
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void msi_free_msi_descs_range(struct device *dev, enum msi_desc_filter filter,
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unsigned int first_index, unsigned int last_index);
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/**
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* msi_free_msi_descs - Free MSI descriptors of a device
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* @dev: Device to free the descriptors
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*/
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static inline void msi_free_msi_descs(struct device *dev)
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{
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msi_free_msi_descs_range(dev, MSI_DESC_ALL, 0, MSI_MAX_INDEX);
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}
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void __pci_read_msi_msg(struct msi_desc *entry, struct msi_msg *msg);
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void __pci_write_msi_msg(struct msi_desc *entry, struct msi_msg *msg);
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void pci_msi_mask_irq(struct irq_data *data);
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void pci_msi_unmask_irq(struct irq_data *data);
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/*
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* The arch hooks to setup up msi irqs. Default functions are implemented
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* as weak symbols so that they /can/ be overriden by architecture specific
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* code if needed. These hooks can only be enabled by the architecture.
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*
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* If CONFIG_PCI_MSI_ARCH_FALLBACKS is not selected they are replaced by
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* stubs with warnings.
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*/
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#ifdef CONFIG_PCI_MSI_ARCH_FALLBACKS
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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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#endif /* CONFIG_PCI_MSI_ARCH_FALLBACKS */
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/*
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* Xen uses non-default msi_domain_ops and hence needs a way to populate sysfs
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* entries of MSI IRQs.
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*/
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#if defined(CONFIG_PCI_XEN) || defined(CONFIG_PCI_MSI_ARCH_FALLBACKS)
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#ifdef CONFIG_SYSFS
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int msi_device_populate_sysfs(struct device *dev);
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void msi_device_destroy_sysfs(struct device *dev);
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#else /* CONFIG_SYSFS */
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static inline int msi_device_populate_sysfs(struct device *dev) { return 0; }
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static inline void msi_device_destroy_sysfs(struct device *dev) { }
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#endif /* !CONFIG_SYSFS */
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#endif /* CONFIG_PCI_XEN || CONFIG_PCI_MSI_ARCH_FALLBACKS */
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/*
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* The restore hook is still available even for fully irq domain based
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* setups. Courtesy to XEN/X86.
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*/
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bool arch_restore_msi_irqs(struct pci_dev *dev);
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#ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN
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#include <linux/irqhandler.h>
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struct irq_domain;
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struct irq_domain_ops;
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struct irq_chip;
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struct device_node;
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struct fwnode_handle;
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struct msi_domain_info;
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/**
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* struct msi_domain_ops - MSI interrupt domain callbacks
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* @get_hwirq: Retrieve the resulting hw irq number
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* @msi_init: Domain specific init function for MSI interrupts
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* @msi_free: Domain specific function to free a MSI interrupts
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* @msi_check: Callback for verification of the domain/info/dev data
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* @msi_prepare: Prepare the allocation of the interrupts in the domain
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* @set_desc: Set the msi descriptor for an interrupt
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* @domain_alloc_irqs: Optional function to override the default allocation
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* function.
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* @domain_free_irqs: Optional function to override the default free
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* function.
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*
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* @get_hwirq, @msi_init and @msi_free are callbacks used by the underlying
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* irqdomain.
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*
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* @msi_check, @msi_prepare and @set_desc are callbacks used by
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* msi_domain_alloc/free_irqs().
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*
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* @domain_alloc_irqs, @domain_free_irqs can be used to override the
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* default allocation/free functions (__msi_domain_alloc/free_irqs). This
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* is initially for a wrapper around XENs seperate MSI universe which can't
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* be wrapped into the regular irq domains concepts by mere mortals. This
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* allows to universally use msi_domain_alloc/free_irqs without having to
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* special case XEN all over the place.
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*
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* Contrary to other operations @domain_alloc_irqs and @domain_free_irqs
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* are set to the default implementation if NULL and even when
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* MSI_FLAG_USE_DEF_DOM_OPS is not set to avoid breaking existing users and
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* because these callbacks are obviously mandatory.
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*
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* This is NOT meant to be abused, but it can be useful to build wrappers
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* for specialized MSI irq domains which need extra work before and after
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* calling __msi_domain_alloc_irqs()/__msi_domain_free_irqs().
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*/
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struct msi_domain_ops {
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irq_hw_number_t (*get_hwirq)(struct msi_domain_info *info,
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msi_alloc_info_t *arg);
|
||
|
|
int (*msi_init)(struct irq_domain *domain,
|
||
|
|
struct msi_domain_info *info,
|
||
|
|
unsigned int virq, irq_hw_number_t hwirq,
|
||
|
|
msi_alloc_info_t *arg);
|
||
|
|
void (*msi_free)(struct irq_domain *domain,
|
||
|
|
struct msi_domain_info *info,
|
||
|
|
unsigned int virq);
|
||
|
|
int (*msi_check)(struct irq_domain *domain,
|
||
|
|
struct msi_domain_info *info,
|
||
|
|
struct device *dev);
|
||
|
|
int (*msi_prepare)(struct irq_domain *domain,
|
||
|
|
struct device *dev, int nvec,
|
||
|
|
msi_alloc_info_t *arg);
|
||
|
|
void (*set_desc)(msi_alloc_info_t *arg,
|
||
|
|
struct msi_desc *desc);
|
||
|
|
int (*domain_alloc_irqs)(struct irq_domain *domain,
|
||
|
|
struct device *dev, int nvec);
|
||
|
|
void (*domain_free_irqs)(struct irq_domain *domain,
|
||
|
|
struct device *dev);
|
||
|
|
};
|
||
|
|
|
||
|
|
/**
|
||
|
|
* struct msi_domain_info - MSI interrupt domain data
|
||
|
|
* @flags: Flags to decribe features and capabilities
|
||
|
|
* @ops: The callback data structure
|
||
|
|
* @chip: Optional: associated interrupt chip
|
||
|
|
* @chip_data: Optional: associated interrupt chip data
|
||
|
|
* @handler: Optional: associated interrupt flow handler
|
||
|
|
* @handler_data: Optional: associated interrupt flow handler data
|
||
|
|
* @handler_name: Optional: associated interrupt flow handler name
|
||
|
|
* @data: Optional: domain specific data
|
||
|
|
*/
|
||
|
|
struct msi_domain_info {
|
||
|
|
u32 flags;
|
||
|
|
struct msi_domain_ops *ops;
|
||
|
|
struct irq_chip *chip;
|
||
|
|
void *chip_data;
|
||
|
|
irq_flow_handler_t handler;
|
||
|
|
void *handler_data;
|
||
|
|
const char *handler_name;
|
||
|
|
void *data;
|
||
|
|
};
|
||
|
|
|
||
|
|
/* Flags for msi_domain_info */
|
||
|
|
enum {
|
||
|
|
/*
|
||
|
|
* Init non implemented ops callbacks with default MSI domain
|
||
|
|
* callbacks.
|
||
|
|
*/
|
||
|
|
MSI_FLAG_USE_DEF_DOM_OPS = (1 << 0),
|
||
|
|
/*
|
||
|
|
* Init non implemented chip callbacks with default MSI chip
|
||
|
|
* callbacks.
|
||
|
|
*/
|
||
|
|
MSI_FLAG_USE_DEF_CHIP_OPS = (1 << 1),
|
||
|
|
/* Support multiple PCI MSI interrupts */
|
||
|
|
MSI_FLAG_MULTI_PCI_MSI = (1 << 2),
|
||
|
|
/* Support PCI MSIX interrupts */
|
||
|
|
MSI_FLAG_PCI_MSIX = (1 << 3),
|
||
|
|
/* Needs early activate, required for PCI */
|
||
|
|
MSI_FLAG_ACTIVATE_EARLY = (1 << 4),
|
||
|
|
/*
|
||
|
|
* Must reactivate when irq is started even when
|
||
|
|
* MSI_FLAG_ACTIVATE_EARLY has been set.
|
||
|
|
*/
|
||
|
|
MSI_FLAG_MUST_REACTIVATE = (1 << 5),
|
||
|
|
/* Is level-triggered capable, using two messages */
|
||
|
|
MSI_FLAG_LEVEL_CAPABLE = (1 << 6),
|
||
|
|
/* Populate sysfs on alloc() and destroy it on free() */
|
||
|
|
MSI_FLAG_DEV_SYSFS = (1 << 7),
|
||
|
|
/* MSI-X entries must be contiguous */
|
||
|
|
MSI_FLAG_MSIX_CONTIGUOUS = (1 << 8),
|
||
|
|
/* Allocate simple MSI descriptors */
|
||
|
|
MSI_FLAG_ALLOC_SIMPLE_MSI_DESCS = (1 << 9),
|
||
|
|
/* Free MSI descriptors */
|
||
|
|
MSI_FLAG_FREE_MSI_DESCS = (1 << 10),
|
||
|
|
};
|
||
|
|
|
||
|
|
int msi_domain_set_affinity(struct irq_data *data, const struct cpumask *mask,
|
||
|
|
bool force);
|
||
|
|
|
||
|
|
struct irq_domain *msi_create_irq_domain(struct fwnode_handle *fwnode,
|
||
|
|
struct msi_domain_info *info,
|
||
|
|
struct irq_domain *parent);
|
||
|
|
int __msi_domain_alloc_irqs(struct irq_domain *domain, struct device *dev,
|
||
|
|
int nvec);
|
||
|
|
int msi_domain_alloc_irqs_descs_locked(struct irq_domain *domain, struct device *dev,
|
||
|
|
int nvec);
|
||
|
|
int msi_domain_alloc_irqs(struct irq_domain *domain, struct device *dev,
|
||
|
|
int nvec);
|
||
|
|
void __msi_domain_free_irqs(struct irq_domain *domain, struct device *dev);
|
||
|
|
void msi_domain_free_irqs_descs_locked(struct irq_domain *domain, struct device *dev);
|
||
|
|
void msi_domain_free_irqs(struct irq_domain *domain, struct device *dev);
|
||
|
|
struct msi_domain_info *msi_get_domain_info(struct irq_domain *domain);
|
||
|
|
|
||
|
|
struct irq_domain *platform_msi_create_irq_domain(struct fwnode_handle *fwnode,
|
||
|
|
struct msi_domain_info *info,
|
||
|
|
struct irq_domain *parent);
|
||
|
|
int platform_msi_domain_alloc_irqs(struct device *dev, unsigned int nvec,
|
||
|
|
irq_write_msi_msg_t write_msi_msg);
|
||
|
|
void platform_msi_domain_free_irqs(struct device *dev);
|
||
|
|
|
||
|
|
/* When an MSI domain is used as an intermediate domain */
|
||
|
|
int msi_domain_prepare_irqs(struct irq_domain *domain, struct device *dev,
|
||
|
|
int nvec, msi_alloc_info_t *args);
|
||
|
|
int msi_domain_populate_irqs(struct irq_domain *domain, struct device *dev,
|
||
|
|
int virq, int nvec, msi_alloc_info_t *args);
|
||
|
|
struct irq_domain *
|
||
|
|
__platform_msi_create_device_domain(struct device *dev,
|
||
|
|
unsigned int nvec,
|
||
|
|
bool is_tree,
|
||
|
|
irq_write_msi_msg_t write_msi_msg,
|
||
|
|
const struct irq_domain_ops *ops,
|
||
|
|
void *host_data);
|
||
|
|
|
||
|
|
#define platform_msi_create_device_domain(dev, nvec, write, ops, data) \
|
||
|
|
__platform_msi_create_device_domain(dev, nvec, false, write, ops, data)
|
||
|
|
#define platform_msi_create_device_tree_domain(dev, nvec, write, ops, data) \
|
||
|
|
__platform_msi_create_device_domain(dev, nvec, true, write, ops, data)
|
||
|
|
|
||
|
|
int platform_msi_device_domain_alloc(struct irq_domain *domain, unsigned int virq,
|
||
|
|
unsigned int nr_irqs);
|
||
|
|
void platform_msi_device_domain_free(struct irq_domain *domain, unsigned int virq,
|
||
|
|
unsigned int nvec);
|
||
|
|
void *platform_msi_get_host_data(struct irq_domain *domain);
|
||
|
|
#endif /* CONFIG_GENERIC_MSI_IRQ_DOMAIN */
|
||
|
|
|
||
|
|
#ifdef CONFIG_PCI_MSI_IRQ_DOMAIN
|
||
|
|
struct irq_domain *pci_msi_create_irq_domain(struct fwnode_handle *fwnode,
|
||
|
|
struct msi_domain_info *info,
|
||
|
|
struct irq_domain *parent);
|
||
|
|
u32 pci_msi_domain_get_msi_rid(struct irq_domain *domain, struct pci_dev *pdev);
|
||
|
|
struct irq_domain *pci_msi_get_device_domain(struct pci_dev *pdev);
|
||
|
|
bool pci_dev_has_special_msi_domain(struct pci_dev *pdev);
|
||
|
|
#else
|
||
|
|
static inline struct irq_domain *pci_msi_get_device_domain(struct pci_dev *pdev)
|
||
|
|
{
|
||
|
|
return NULL;
|
||
|
|
}
|
||
|
|
#endif /* CONFIG_PCI_MSI_IRQ_DOMAIN */
|
||
|
|
|
||
|
|
#endif /* LINUX_MSI_H */
|