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cd6cf06590
The current linked list storage for MSI descriptors is suboptimal in several ways: 1) Looking up a MSI desciptor requires a O(n) list walk in the worst case 2) The upcoming support of runtime expansion of MSI-X vectors would need to do a full list walk to figure out whether a particular index is already associated. 3) Runtime expansion of sparse allocations is even more complex as the current implementation assumes an ordered list (increasing MSI index). Use an xarray which solves all of the above problems nicely. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Tested-by: Michael Kelley <mikelley@microsoft.com> Tested-by: Nishanth Menon <nm@ti.com> Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Reviewed-by: Jason Gunthorpe <jgg@nvidia.com> Link: https://lore.kernel.org/r/20211206210749.280627070@linutronix.de
486 lines
16 KiB
C
486 lines
16 KiB
C
/* 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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#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_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);
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int (*msi_init)(struct irq_domain *domain,
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struct msi_domain_info *info,
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unsigned int virq, irq_hw_number_t hwirq,
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msi_alloc_info_t *arg);
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void (*msi_free)(struct irq_domain *domain,
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struct msi_domain_info *info,
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unsigned int virq);
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int (*msi_check)(struct irq_domain *domain,
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struct msi_domain_info *info,
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struct device *dev);
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int (*msi_prepare)(struct irq_domain *domain,
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struct device *dev, int nvec,
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msi_alloc_info_t *arg);
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void (*set_desc)(msi_alloc_info_t *arg,
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struct msi_desc *desc);
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int (*domain_alloc_irqs)(struct irq_domain *domain,
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struct device *dev, int nvec);
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void (*domain_free_irqs)(struct irq_domain *domain,
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struct device *dev);
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};
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/**
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* struct msi_domain_info - MSI interrupt domain data
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* @flags: Flags to decribe features and capabilities
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* @ops: The callback data structure
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* @chip: Optional: associated interrupt chip
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* @chip_data: Optional: associated interrupt chip data
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* @handler: Optional: associated interrupt flow handler
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* @handler_data: Optional: associated interrupt flow handler data
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* @handler_name: Optional: associated interrupt flow handler name
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* @data: Optional: domain specific data
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*/
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struct msi_domain_info {
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u32 flags;
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struct msi_domain_ops *ops;
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struct irq_chip *chip;
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void *chip_data;
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irq_flow_handler_t handler;
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void *handler_data;
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const char *handler_name;
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void *data;
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};
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/* Flags for msi_domain_info */
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enum {
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/*
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* Init non implemented ops callbacks with default MSI domain
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* callbacks.
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*/
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MSI_FLAG_USE_DEF_DOM_OPS = (1 << 0),
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/*
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* Init non implemented chip callbacks with default MSI chip
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* callbacks.
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*/
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MSI_FLAG_USE_DEF_CHIP_OPS = (1 << 1),
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/* Support multiple PCI MSI interrupts */
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MSI_FLAG_MULTI_PCI_MSI = (1 << 2),
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/* Support PCI MSIX interrupts */
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MSI_FLAG_PCI_MSIX = (1 << 3),
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/* Needs early activate, required for PCI */
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MSI_FLAG_ACTIVATE_EARLY = (1 << 4),
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/*
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* Must reactivate when irq is started even when
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* MSI_FLAG_ACTIVATE_EARLY has been set.
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*/
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MSI_FLAG_MUST_REACTIVATE = (1 << 5),
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/* Is level-triggered capable, using two messages */
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MSI_FLAG_LEVEL_CAPABLE = (1 << 6),
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/* Populate sysfs on alloc() and destroy it on free() */
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MSI_FLAG_DEV_SYSFS = (1 << 7),
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/* MSI-X entries must be contiguous */
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MSI_FLAG_MSIX_CONTIGUOUS = (1 << 8),
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/* Allocate simple MSI descriptors */
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MSI_FLAG_ALLOC_SIMPLE_MSI_DESCS = (1 << 9),
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/* Free MSI descriptors */
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MSI_FLAG_FREE_MSI_DESCS = (1 << 10),
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};
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int msi_domain_set_affinity(struct irq_data *data, const struct cpumask *mask,
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bool force);
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struct irq_domain *msi_create_irq_domain(struct fwnode_handle *fwnode,
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struct msi_domain_info *info,
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struct irq_domain *parent);
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int __msi_domain_alloc_irqs(struct irq_domain *domain, struct device *dev,
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int nvec);
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int msi_domain_alloc_irqs_descs_locked(struct irq_domain *domain, struct device *dev,
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int nvec);
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int msi_domain_alloc_irqs(struct irq_domain *domain, struct device *dev,
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int nvec);
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void __msi_domain_free_irqs(struct irq_domain *domain, struct device *dev);
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void msi_domain_free_irqs_descs_locked(struct irq_domain *domain, struct device *dev);
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void msi_domain_free_irqs(struct irq_domain *domain, struct device *dev);
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struct msi_domain_info *msi_get_domain_info(struct irq_domain *domain);
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struct irq_domain *platform_msi_create_irq_domain(struct fwnode_handle *fwnode,
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struct msi_domain_info *info,
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struct irq_domain *parent);
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int platform_msi_domain_alloc_irqs(struct device *dev, unsigned int nvec,
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irq_write_msi_msg_t write_msi_msg);
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void platform_msi_domain_free_irqs(struct device *dev);
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/* When an MSI domain is used as an intermediate domain */
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int msi_domain_prepare_irqs(struct irq_domain *domain, struct device *dev,
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int nvec, msi_alloc_info_t *args);
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int msi_domain_populate_irqs(struct irq_domain *domain, struct device *dev,
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int virq, int nvec, msi_alloc_info_t *args);
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struct irq_domain *
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__platform_msi_create_device_domain(struct device *dev,
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unsigned int nvec,
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bool is_tree,
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irq_write_msi_msg_t write_msi_msg,
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const struct irq_domain_ops *ops,
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void *host_data);
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|
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#define platform_msi_create_device_domain(dev, nvec, write, ops, data) \
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__platform_msi_create_device_domain(dev, nvec, false, write, ops, data)
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#define platform_msi_create_device_tree_domain(dev, nvec, write, ops, data) \
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__platform_msi_create_device_domain(dev, nvec, true, write, ops, data)
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|
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int platform_msi_device_domain_alloc(struct irq_domain *domain, unsigned int virq,
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|
unsigned int nr_irqs);
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void platform_msi_device_domain_free(struct irq_domain *domain, unsigned int virq,
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|
unsigned int nvec);
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void *platform_msi_get_host_data(struct irq_domain *domain);
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#endif /* CONFIG_GENERIC_MSI_IRQ_DOMAIN */
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|
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|
#ifdef CONFIG_PCI_MSI_IRQ_DOMAIN
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struct irq_domain *pci_msi_create_irq_domain(struct fwnode_handle *fwnode,
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|
struct msi_domain_info *info,
|
|
struct irq_domain *parent);
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u32 pci_msi_domain_get_msi_rid(struct irq_domain *domain, struct pci_dev *pdev);
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struct irq_domain *pci_msi_get_device_domain(struct pci_dev *pdev);
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bool pci_dev_has_special_msi_domain(struct pci_dev *pdev);
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#else
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static inline struct irq_domain *pci_msi_get_device_domain(struct pci_dev *pdev)
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{
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return NULL;
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}
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#endif /* CONFIG_PCI_MSI_IRQ_DOMAIN */
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|
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#endif /* LINUX_MSI_H */
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