1038 lines
27 KiB
C
1038 lines
27 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2014 Intel Corp.
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* Author: Jiang Liu <jiang.liu@linux.intel.com>
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*
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* This file is licensed under GPLv2.
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*
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* This file contains common code to support Message Signaled Interrupts for
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* PCI compatible and non PCI compatible devices.
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*/
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#include <linux/types.h>
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#include <linux/device.h>
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#include <linux/irq.h>
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#include <linux/irqdomain.h>
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#include <linux/msi.h>
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#include <linux/slab.h>
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#include <linux/sysfs.h>
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#include <linux/pci.h>
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#include "internals.h"
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static inline int msi_sysfs_create_group(struct device *dev);
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/**
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* msi_alloc_desc - Allocate an initialized msi_desc
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* @dev: Pointer to the device for which this is allocated
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* @nvec: The number of vectors used in this entry
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* @affinity: Optional pointer to an affinity mask array size of @nvec
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*
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* If @affinity is not %NULL then an affinity array[@nvec] is allocated
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* and the affinity masks and flags from @affinity are copied.
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*
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* Return: pointer to allocated &msi_desc on success or %NULL on failure
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*/
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static struct msi_desc *msi_alloc_desc(struct device *dev, int nvec,
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const struct irq_affinity_desc *affinity)
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{
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struct msi_desc *desc = kzalloc(sizeof(*desc), GFP_KERNEL);
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if (!desc)
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return NULL;
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desc->dev = dev;
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desc->nvec_used = nvec;
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if (affinity) {
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desc->affinity = kmemdup(affinity, nvec * sizeof(*desc->affinity), GFP_KERNEL);
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if (!desc->affinity) {
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kfree(desc);
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return NULL;
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}
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}
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return desc;
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}
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static void msi_free_desc(struct msi_desc *desc)
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{
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kfree(desc->affinity);
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kfree(desc);
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}
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static int msi_insert_desc(struct msi_device_data *md, struct msi_desc *desc, unsigned int index)
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{
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int ret;
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desc->msi_index = index;
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ret = xa_insert(&md->__store, index, desc, GFP_KERNEL);
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if (ret)
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msi_free_desc(desc);
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return ret;
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}
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/**
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* msi_add_msi_desc - Allocate and initialize a MSI descriptor
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* @dev: Pointer to the device for which the descriptor is allocated
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* @init_desc: Pointer to an MSI descriptor to initialize the new descriptor
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*
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* Return: 0 on success or an appropriate failure code.
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*/
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int msi_add_msi_desc(struct device *dev, struct msi_desc *init_desc)
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{
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struct msi_desc *desc;
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lockdep_assert_held(&dev->msi.data->mutex);
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desc = msi_alloc_desc(dev, init_desc->nvec_used, init_desc->affinity);
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if (!desc)
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return -ENOMEM;
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/* Copy type specific data to the new descriptor. */
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desc->pci = init_desc->pci;
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return msi_insert_desc(dev->msi.data, desc, init_desc->msi_index);
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}
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/**
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* msi_add_simple_msi_descs - Allocate and initialize MSI descriptors
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* @dev: Pointer to the device for which the descriptors are allocated
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* @index: Index for the first MSI descriptor
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* @ndesc: Number of descriptors to allocate
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*
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* Return: 0 on success or an appropriate failure code.
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*/
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static int msi_add_simple_msi_descs(struct device *dev, unsigned int index, unsigned int ndesc)
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{
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unsigned int idx, last = index + ndesc - 1;
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struct msi_desc *desc;
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int ret;
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lockdep_assert_held(&dev->msi.data->mutex);
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for (idx = index; idx <= last; idx++) {
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desc = msi_alloc_desc(dev, 1, NULL);
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if (!desc)
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goto fail_mem;
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ret = msi_insert_desc(dev->msi.data, desc, idx);
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if (ret)
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goto fail;
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}
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return 0;
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fail_mem:
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ret = -ENOMEM;
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fail:
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msi_free_msi_descs_range(dev, MSI_DESC_NOTASSOCIATED, index, last);
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return ret;
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}
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static bool msi_desc_match(struct msi_desc *desc, enum msi_desc_filter filter)
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{
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switch (filter) {
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case MSI_DESC_ALL:
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return true;
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case MSI_DESC_NOTASSOCIATED:
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return !desc->irq;
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case MSI_DESC_ASSOCIATED:
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return !!desc->irq;
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}
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WARN_ON_ONCE(1);
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return false;
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}
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/**
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* msi_free_msi_descs_range - Free MSI descriptors of a device
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* @dev: Device to free the descriptors
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* @filter: Descriptor state filter
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* @first_index: Index to start freeing from
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* @last_index: Last index to be freed
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*/
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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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struct xarray *xa = &dev->msi.data->__store;
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struct msi_desc *desc;
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unsigned long idx;
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lockdep_assert_held(&dev->msi.data->mutex);
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xa_for_each_range(xa, idx, desc, first_index, last_index) {
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if (msi_desc_match(desc, filter)) {
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xa_erase(xa, idx);
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msi_free_desc(desc);
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}
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}
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}
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void __get_cached_msi_msg(struct msi_desc *entry, struct msi_msg *msg)
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{
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*msg = entry->msg;
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}
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void get_cached_msi_msg(unsigned int irq, struct msi_msg *msg)
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{
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struct msi_desc *entry = irq_get_msi_desc(irq);
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__get_cached_msi_msg(entry, msg);
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}
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EXPORT_SYMBOL_GPL(get_cached_msi_msg);
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static void msi_device_data_release(struct device *dev, void *res)
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{
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struct msi_device_data *md = res;
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WARN_ON_ONCE(!xa_empty(&md->__store));
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xa_destroy(&md->__store);
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dev->msi.data = NULL;
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}
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/**
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* msi_setup_device_data - Setup MSI device data
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* @dev: Device for which MSI device data should be set up
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*
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* Return: 0 on success, appropriate error code otherwise
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*
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* This can be called more than once for @dev. If the MSI device data is
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* already allocated the call succeeds. The allocated memory is
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* automatically released when the device is destroyed.
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*/
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int msi_setup_device_data(struct device *dev)
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{
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struct msi_device_data *md;
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int ret;
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if (dev->msi.data)
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return 0;
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md = devres_alloc(msi_device_data_release, sizeof(*md), GFP_KERNEL);
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if (!md)
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return -ENOMEM;
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ret = msi_sysfs_create_group(dev);
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if (ret) {
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devres_free(md);
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return ret;
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}
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xa_init(&md->__store);
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mutex_init(&md->mutex);
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dev->msi.data = md;
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devres_add(dev, md);
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return 0;
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}
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/**
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* msi_lock_descs - Lock the MSI descriptor storage of a device
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* @dev: Device to operate on
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*/
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void msi_lock_descs(struct device *dev)
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{
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mutex_lock(&dev->msi.data->mutex);
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}
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EXPORT_SYMBOL_GPL(msi_lock_descs);
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/**
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* msi_unlock_descs - Unlock the MSI descriptor storage of a device
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* @dev: Device to operate on
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*/
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void msi_unlock_descs(struct device *dev)
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{
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/* Invalidate the index wich was cached by the iterator */
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dev->msi.data->__iter_idx = MSI_MAX_INDEX;
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mutex_unlock(&dev->msi.data->mutex);
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}
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EXPORT_SYMBOL_GPL(msi_unlock_descs);
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static struct msi_desc *msi_find_desc(struct msi_device_data *md, enum msi_desc_filter filter)
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{
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struct msi_desc *desc;
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xa_for_each_start(&md->__store, md->__iter_idx, desc, md->__iter_idx) {
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if (msi_desc_match(desc, filter))
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return desc;
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}
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md->__iter_idx = MSI_MAX_INDEX;
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return NULL;
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}
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/**
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* msi_first_desc - Get the first MSI descriptor of a device
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* @dev: Device to operate on
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* @filter: Descriptor state filter
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*
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* Must be called with the MSI descriptor mutex held, i.e. msi_lock_descs()
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* must be invoked before the call.
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*
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* Return: Pointer to the first MSI descriptor matching the search
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* criteria, NULL if none found.
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*/
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struct msi_desc *msi_first_desc(struct device *dev, enum msi_desc_filter filter)
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{
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struct msi_device_data *md = dev->msi.data;
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if (WARN_ON_ONCE(!md))
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return NULL;
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lockdep_assert_held(&md->mutex);
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md->__iter_idx = 0;
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return msi_find_desc(md, filter);
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}
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EXPORT_SYMBOL_GPL(msi_first_desc);
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/**
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* msi_next_desc - Get the next MSI descriptor of a device
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* @dev: Device to operate on
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*
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* The first invocation of msi_next_desc() has to be preceeded by a
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* successful invocation of __msi_first_desc(). Consecutive invocations are
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* only valid if the previous one was successful. All these operations have
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* to be done within the same MSI mutex held region.
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*
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* Return: Pointer to the next MSI descriptor matching the search
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* criteria, NULL if none found.
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*/
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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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struct msi_device_data *md = dev->msi.data;
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if (WARN_ON_ONCE(!md))
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return NULL;
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lockdep_assert_held(&md->mutex);
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if (md->__iter_idx >= (unsigned long)MSI_MAX_INDEX)
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return NULL;
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md->__iter_idx++;
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return msi_find_desc(md, filter);
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}
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EXPORT_SYMBOL_GPL(msi_next_desc);
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/**
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* msi_get_virq - Return Linux interrupt number of a MSI interrupt
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* @dev: Device to operate on
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* @index: MSI interrupt index to look for (0-based)
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*
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* Return: The Linux interrupt number on success (> 0), 0 if not found
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*/
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unsigned int msi_get_virq(struct device *dev, unsigned int index)
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{
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struct msi_desc *desc;
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unsigned int ret = 0;
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bool pcimsi;
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if (!dev->msi.data)
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return 0;
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pcimsi = dev_is_pci(dev) ? to_pci_dev(dev)->msi_enabled : false;
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msi_lock_descs(dev);
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desc = xa_load(&dev->msi.data->__store, pcimsi ? 0 : index);
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if (desc && desc->irq) {
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/*
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* PCI-MSI has only one descriptor for multiple interrupts.
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* PCI-MSIX and platform MSI use a descriptor per
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* interrupt.
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*/
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if (pcimsi) {
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if (index < desc->nvec_used)
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ret = desc->irq + index;
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} else {
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ret = desc->irq;
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}
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}
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msi_unlock_descs(dev);
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return ret;
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}
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EXPORT_SYMBOL_GPL(msi_get_virq);
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#ifdef CONFIG_SYSFS
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static struct attribute *msi_dev_attrs[] = {
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NULL
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};
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static const struct attribute_group msi_irqs_group = {
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.name = "msi_irqs",
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.attrs = msi_dev_attrs,
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};
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static inline int msi_sysfs_create_group(struct device *dev)
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{
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return devm_device_add_group(dev, &msi_irqs_group);
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}
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static ssize_t msi_mode_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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/* MSI vs. MSIX is per device not per interrupt */
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bool is_msix = dev_is_pci(dev) ? to_pci_dev(dev)->msix_enabled : false;
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return sysfs_emit(buf, "%s\n", is_msix ? "msix" : "msi");
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}
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static void msi_sysfs_remove_desc(struct device *dev, struct msi_desc *desc)
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{
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struct device_attribute *attrs = desc->sysfs_attrs;
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int i;
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if (!attrs)
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return;
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desc->sysfs_attrs = NULL;
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for (i = 0; i < desc->nvec_used; i++) {
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if (attrs[i].show)
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sysfs_remove_file_from_group(&dev->kobj, &attrs[i].attr, msi_irqs_group.name);
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kfree(attrs[i].attr.name);
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}
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kfree(attrs);
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}
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static int msi_sysfs_populate_desc(struct device *dev, struct msi_desc *desc)
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{
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struct device_attribute *attrs;
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int ret, i;
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attrs = kcalloc(desc->nvec_used, sizeof(*attrs), GFP_KERNEL);
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if (!attrs)
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return -ENOMEM;
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desc->sysfs_attrs = attrs;
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for (i = 0; i < desc->nvec_used; i++) {
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sysfs_attr_init(&attrs[i].attr);
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attrs[i].attr.name = kasprintf(GFP_KERNEL, "%d", desc->irq + i);
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if (!attrs[i].attr.name) {
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ret = -ENOMEM;
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goto fail;
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}
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attrs[i].attr.mode = 0444;
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attrs[i].show = msi_mode_show;
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ret = sysfs_add_file_to_group(&dev->kobj, &attrs[i].attr, msi_irqs_group.name);
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if (ret) {
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attrs[i].show = NULL;
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goto fail;
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}
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}
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return 0;
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fail:
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msi_sysfs_remove_desc(dev, desc);
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return ret;
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}
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#ifdef CONFIG_PCI_MSI_ARCH_FALLBACKS
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/**
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* msi_device_populate_sysfs - Populate msi_irqs sysfs entries for a device
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* @dev: The device (PCI, platform etc) which will get sysfs entries
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*/
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int msi_device_populate_sysfs(struct device *dev)
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{
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struct msi_desc *desc;
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int ret;
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msi_for_each_desc(desc, dev, MSI_DESC_ASSOCIATED) {
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if (desc->sysfs_attrs)
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continue;
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ret = msi_sysfs_populate_desc(dev, desc);
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if (ret)
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return ret;
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}
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return 0;
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}
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/**
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* msi_device_destroy_sysfs - Destroy msi_irqs sysfs entries for a device
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* @dev: The device (PCI, platform etc) for which to remove
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* sysfs entries
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*/
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void msi_device_destroy_sysfs(struct device *dev)
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{
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struct msi_desc *desc;
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msi_for_each_desc(desc, dev, MSI_DESC_ALL)
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msi_sysfs_remove_desc(dev, desc);
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}
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#endif /* CONFIG_PCI_MSI_ARCH_FALLBACK */
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#else /* CONFIG_SYSFS */
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static inline int msi_sysfs_create_group(struct device *dev) { return 0; }
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static inline int msi_sysfs_populate_desc(struct device *dev, struct msi_desc *desc) { return 0; }
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static inline void msi_sysfs_remove_desc(struct device *dev, struct msi_desc *desc) { }
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#endif /* !CONFIG_SYSFS */
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#ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN
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static inline void irq_chip_write_msi_msg(struct irq_data *data,
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struct msi_msg *msg)
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{
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data->chip->irq_write_msi_msg(data, msg);
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}
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static void msi_check_level(struct irq_domain *domain, struct msi_msg *msg)
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{
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struct msi_domain_info *info = domain->host_data;
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/*
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* If the MSI provider has messed with the second message and
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* not advertized that it is level-capable, signal the breakage.
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*/
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WARN_ON(!((info->flags & MSI_FLAG_LEVEL_CAPABLE) &&
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(info->chip->flags & IRQCHIP_SUPPORTS_LEVEL_MSI)) &&
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(msg[1].address_lo || msg[1].address_hi || msg[1].data));
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}
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/**
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* msi_domain_set_affinity - Generic affinity setter function for MSI domains
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* @irq_data: The irq data associated to the interrupt
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* @mask: The affinity mask to set
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* @force: Flag to enforce setting (disable online checks)
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*
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* Intended to be used by MSI interrupt controllers which are
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* implemented with hierarchical domains.
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*
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* Return: IRQ_SET_MASK_* result code
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*/
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int msi_domain_set_affinity(struct irq_data *irq_data,
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const struct cpumask *mask, bool force)
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{
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struct irq_data *parent = irq_data->parent_data;
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struct msi_msg msg[2] = { [1] = { }, };
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int ret;
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ret = parent->chip->irq_set_affinity(parent, mask, force);
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if (ret >= 0 && ret != IRQ_SET_MASK_OK_DONE) {
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BUG_ON(irq_chip_compose_msi_msg(irq_data, msg));
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msi_check_level(irq_data->domain, msg);
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irq_chip_write_msi_msg(irq_data, msg);
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}
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return ret;
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}
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static int msi_domain_activate(struct irq_domain *domain,
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struct irq_data *irq_data, bool early)
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{
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struct msi_msg msg[2] = { [1] = { }, };
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BUG_ON(irq_chip_compose_msi_msg(irq_data, msg));
|
|
msi_check_level(irq_data->domain, msg);
|
|
irq_chip_write_msi_msg(irq_data, msg);
|
|
return 0;
|
|
}
|
|
|
|
static void msi_domain_deactivate(struct irq_domain *domain,
|
|
struct irq_data *irq_data)
|
|
{
|
|
struct msi_msg msg[2];
|
|
|
|
memset(msg, 0, sizeof(msg));
|
|
irq_chip_write_msi_msg(irq_data, msg);
|
|
}
|
|
|
|
static int msi_domain_alloc(struct irq_domain *domain, unsigned int virq,
|
|
unsigned int nr_irqs, void *arg)
|
|
{
|
|
struct msi_domain_info *info = domain->host_data;
|
|
struct msi_domain_ops *ops = info->ops;
|
|
irq_hw_number_t hwirq = ops->get_hwirq(info, arg);
|
|
int i, ret;
|
|
|
|
if (irq_find_mapping(domain, hwirq) > 0)
|
|
return -EEXIST;
|
|
|
|
if (domain->parent) {
|
|
ret = irq_domain_alloc_irqs_parent(domain, virq, nr_irqs, arg);
|
|
if (ret < 0)
|
|
return ret;
|
|
}
|
|
|
|
for (i = 0; i < nr_irqs; i++) {
|
|
ret = ops->msi_init(domain, info, virq + i, hwirq + i, arg);
|
|
if (ret < 0) {
|
|
if (ops->msi_free) {
|
|
for (i--; i > 0; i--)
|
|
ops->msi_free(domain, info, virq + i);
|
|
}
|
|
irq_domain_free_irqs_top(domain, virq, nr_irqs);
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void msi_domain_free(struct irq_domain *domain, unsigned int virq,
|
|
unsigned int nr_irqs)
|
|
{
|
|
struct msi_domain_info *info = domain->host_data;
|
|
int i;
|
|
|
|
if (info->ops->msi_free) {
|
|
for (i = 0; i < nr_irqs; i++)
|
|
info->ops->msi_free(domain, info, virq + i);
|
|
}
|
|
irq_domain_free_irqs_top(domain, virq, nr_irqs);
|
|
}
|
|
|
|
static const struct irq_domain_ops msi_domain_ops = {
|
|
.alloc = msi_domain_alloc,
|
|
.free = msi_domain_free,
|
|
.activate = msi_domain_activate,
|
|
.deactivate = msi_domain_deactivate,
|
|
};
|
|
|
|
static irq_hw_number_t msi_domain_ops_get_hwirq(struct msi_domain_info *info,
|
|
msi_alloc_info_t *arg)
|
|
{
|
|
return arg->hwirq;
|
|
}
|
|
|
|
static int msi_domain_ops_prepare(struct irq_domain *domain, struct device *dev,
|
|
int nvec, msi_alloc_info_t *arg)
|
|
{
|
|
memset(arg, 0, sizeof(*arg));
|
|
return 0;
|
|
}
|
|
|
|
static void msi_domain_ops_set_desc(msi_alloc_info_t *arg,
|
|
struct msi_desc *desc)
|
|
{
|
|
arg->desc = desc;
|
|
}
|
|
|
|
static int msi_domain_ops_init(struct irq_domain *domain,
|
|
struct msi_domain_info *info,
|
|
unsigned int virq, irq_hw_number_t hwirq,
|
|
msi_alloc_info_t *arg)
|
|
{
|
|
irq_domain_set_hwirq_and_chip(domain, virq, hwirq, info->chip,
|
|
info->chip_data);
|
|
if (info->handler && info->handler_name) {
|
|
__irq_set_handler(virq, info->handler, 0, info->handler_name);
|
|
if (info->handler_data)
|
|
irq_set_handler_data(virq, info->handler_data);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int msi_domain_ops_check(struct irq_domain *domain,
|
|
struct msi_domain_info *info,
|
|
struct device *dev)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static struct msi_domain_ops msi_domain_ops_default = {
|
|
.get_hwirq = msi_domain_ops_get_hwirq,
|
|
.msi_init = msi_domain_ops_init,
|
|
.msi_check = msi_domain_ops_check,
|
|
.msi_prepare = msi_domain_ops_prepare,
|
|
.set_desc = msi_domain_ops_set_desc,
|
|
.domain_alloc_irqs = __msi_domain_alloc_irqs,
|
|
.domain_free_irqs = __msi_domain_free_irqs,
|
|
};
|
|
|
|
static void msi_domain_update_dom_ops(struct msi_domain_info *info)
|
|
{
|
|
struct msi_domain_ops *ops = info->ops;
|
|
|
|
if (ops == NULL) {
|
|
info->ops = &msi_domain_ops_default;
|
|
return;
|
|
}
|
|
|
|
if (ops->domain_alloc_irqs == NULL)
|
|
ops->domain_alloc_irqs = msi_domain_ops_default.domain_alloc_irqs;
|
|
if (ops->domain_free_irqs == NULL)
|
|
ops->domain_free_irqs = msi_domain_ops_default.domain_free_irqs;
|
|
|
|
if (!(info->flags & MSI_FLAG_USE_DEF_DOM_OPS))
|
|
return;
|
|
|
|
if (ops->get_hwirq == NULL)
|
|
ops->get_hwirq = msi_domain_ops_default.get_hwirq;
|
|
if (ops->msi_init == NULL)
|
|
ops->msi_init = msi_domain_ops_default.msi_init;
|
|
if (ops->msi_check == NULL)
|
|
ops->msi_check = msi_domain_ops_default.msi_check;
|
|
if (ops->msi_prepare == NULL)
|
|
ops->msi_prepare = msi_domain_ops_default.msi_prepare;
|
|
if (ops->set_desc == NULL)
|
|
ops->set_desc = msi_domain_ops_default.set_desc;
|
|
}
|
|
|
|
static void msi_domain_update_chip_ops(struct msi_domain_info *info)
|
|
{
|
|
struct irq_chip *chip = info->chip;
|
|
|
|
BUG_ON(!chip || !chip->irq_mask || !chip->irq_unmask);
|
|
if (!chip->irq_set_affinity)
|
|
chip->irq_set_affinity = msi_domain_set_affinity;
|
|
}
|
|
|
|
/**
|
|
* msi_create_irq_domain - Create an MSI interrupt domain
|
|
* @fwnode: Optional fwnode of the interrupt controller
|
|
* @info: MSI domain info
|
|
* @parent: Parent irq domain
|
|
*
|
|
* Return: pointer to the created &struct irq_domain or %NULL on failure
|
|
*/
|
|
struct irq_domain *msi_create_irq_domain(struct fwnode_handle *fwnode,
|
|
struct msi_domain_info *info,
|
|
struct irq_domain *parent)
|
|
{
|
|
struct irq_domain *domain;
|
|
|
|
msi_domain_update_dom_ops(info);
|
|
if (info->flags & MSI_FLAG_USE_DEF_CHIP_OPS)
|
|
msi_domain_update_chip_ops(info);
|
|
|
|
domain = irq_domain_create_hierarchy(parent, IRQ_DOMAIN_FLAG_MSI, 0,
|
|
fwnode, &msi_domain_ops, info);
|
|
|
|
if (domain && !domain->name && info->chip)
|
|
domain->name = info->chip->name;
|
|
|
|
return domain;
|
|
}
|
|
|
|
int msi_domain_prepare_irqs(struct irq_domain *domain, struct device *dev,
|
|
int nvec, msi_alloc_info_t *arg)
|
|
{
|
|
struct msi_domain_info *info = domain->host_data;
|
|
struct msi_domain_ops *ops = info->ops;
|
|
int ret;
|
|
|
|
ret = ops->msi_check(domain, info, dev);
|
|
if (ret == 0)
|
|
ret = ops->msi_prepare(domain, dev, nvec, arg);
|
|
|
|
return ret;
|
|
}
|
|
|
|
int msi_domain_populate_irqs(struct irq_domain *domain, struct device *dev,
|
|
int virq_base, int nvec, msi_alloc_info_t *arg)
|
|
{
|
|
struct msi_domain_info *info = domain->host_data;
|
|
struct msi_domain_ops *ops = info->ops;
|
|
struct msi_desc *desc;
|
|
int ret, virq;
|
|
|
|
msi_lock_descs(dev);
|
|
ret = msi_add_simple_msi_descs(dev, virq_base, nvec);
|
|
if (ret)
|
|
goto unlock;
|
|
|
|
for (virq = virq_base; virq < virq_base + nvec; virq++) {
|
|
desc = xa_load(&dev->msi.data->__store, virq);
|
|
desc->irq = virq;
|
|
|
|
ops->set_desc(arg, desc);
|
|
ret = irq_domain_alloc_irqs_hierarchy(domain, virq, 1, arg);
|
|
if (ret)
|
|
goto fail;
|
|
|
|
irq_set_msi_desc(virq, desc);
|
|
}
|
|
msi_unlock_descs(dev);
|
|
return 0;
|
|
|
|
fail:
|
|
for (--virq; virq >= virq_base; virq--)
|
|
irq_domain_free_irqs_common(domain, virq, 1);
|
|
msi_free_msi_descs_range(dev, MSI_DESC_ALL, virq_base, virq_base + nvec - 1);
|
|
unlock:
|
|
msi_unlock_descs(dev);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Carefully check whether the device can use reservation mode. If
|
|
* reservation mode is enabled then the early activation will assign a
|
|
* dummy vector to the device. If the PCI/MSI device does not support
|
|
* masking of the entry then this can result in spurious interrupts when
|
|
* the device driver is not absolutely careful. But even then a malfunction
|
|
* of the hardware could result in a spurious interrupt on the dummy vector
|
|
* and render the device unusable. If the entry can be masked then the core
|
|
* logic will prevent the spurious interrupt and reservation mode can be
|
|
* used. For now reservation mode is restricted to PCI/MSI.
|
|
*/
|
|
static bool msi_check_reservation_mode(struct irq_domain *domain,
|
|
struct msi_domain_info *info,
|
|
struct device *dev)
|
|
{
|
|
struct msi_desc *desc;
|
|
|
|
switch(domain->bus_token) {
|
|
case DOMAIN_BUS_PCI_MSI:
|
|
case DOMAIN_BUS_VMD_MSI:
|
|
break;
|
|
default:
|
|
return false;
|
|
}
|
|
|
|
if (!(info->flags & MSI_FLAG_MUST_REACTIVATE))
|
|
return false;
|
|
|
|
if (IS_ENABLED(CONFIG_PCI_MSI) && pci_msi_ignore_mask)
|
|
return false;
|
|
|
|
/*
|
|
* Checking the first MSI descriptor is sufficient. MSIX supports
|
|
* masking and MSI does so when the can_mask attribute is set.
|
|
*/
|
|
desc = msi_first_desc(dev, MSI_DESC_ALL);
|
|
return desc->pci.msi_attrib.is_msix || desc->pci.msi_attrib.can_mask;
|
|
}
|
|
|
|
static int msi_handle_pci_fail(struct irq_domain *domain, struct msi_desc *desc,
|
|
int allocated)
|
|
{
|
|
switch(domain->bus_token) {
|
|
case DOMAIN_BUS_PCI_MSI:
|
|
case DOMAIN_BUS_VMD_MSI:
|
|
if (IS_ENABLED(CONFIG_PCI_MSI))
|
|
break;
|
|
fallthrough;
|
|
default:
|
|
return -ENOSPC;
|
|
}
|
|
|
|
/* Let a failed PCI multi MSI allocation retry */
|
|
if (desc->nvec_used > 1)
|
|
return 1;
|
|
|
|
/* If there was a successful allocation let the caller know */
|
|
return allocated ? allocated : -ENOSPC;
|
|
}
|
|
|
|
#define VIRQ_CAN_RESERVE 0x01
|
|
#define VIRQ_ACTIVATE 0x02
|
|
#define VIRQ_NOMASK_QUIRK 0x04
|
|
|
|
static int msi_init_virq(struct irq_domain *domain, int virq, unsigned int vflags)
|
|
{
|
|
struct irq_data *irqd = irq_domain_get_irq_data(domain, virq);
|
|
int ret;
|
|
|
|
if (!(vflags & VIRQ_CAN_RESERVE)) {
|
|
irqd_clr_can_reserve(irqd);
|
|
if (vflags & VIRQ_NOMASK_QUIRK)
|
|
irqd_set_msi_nomask_quirk(irqd);
|
|
}
|
|
|
|
if (!(vflags & VIRQ_ACTIVATE))
|
|
return 0;
|
|
|
|
ret = irq_domain_activate_irq(irqd, vflags & VIRQ_CAN_RESERVE);
|
|
if (ret)
|
|
return ret;
|
|
/*
|
|
* If the interrupt uses reservation mode, clear the activated bit
|
|
* so request_irq() will assign the final vector.
|
|
*/
|
|
if (vflags & VIRQ_CAN_RESERVE)
|
|
irqd_clr_activated(irqd);
|
|
return 0;
|
|
}
|
|
|
|
int __msi_domain_alloc_irqs(struct irq_domain *domain, struct device *dev,
|
|
int nvec)
|
|
{
|
|
struct msi_domain_info *info = domain->host_data;
|
|
struct msi_domain_ops *ops = info->ops;
|
|
msi_alloc_info_t arg = { };
|
|
unsigned int vflags = 0;
|
|
struct msi_desc *desc;
|
|
int allocated = 0;
|
|
int i, ret, virq;
|
|
|
|
ret = msi_domain_prepare_irqs(domain, dev, nvec, &arg);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/*
|
|
* This flag is set by the PCI layer as we need to activate
|
|
* the MSI entries before the PCI layer enables MSI in the
|
|
* card. Otherwise the card latches a random msi message.
|
|
*/
|
|
if (info->flags & MSI_FLAG_ACTIVATE_EARLY)
|
|
vflags |= VIRQ_ACTIVATE;
|
|
|
|
/*
|
|
* Interrupt can use a reserved vector and will not occupy
|
|
* a real device vector until the interrupt is requested.
|
|
*/
|
|
if (msi_check_reservation_mode(domain, info, dev)) {
|
|
vflags |= VIRQ_CAN_RESERVE;
|
|
/*
|
|
* MSI affinity setting requires a special quirk (X86) when
|
|
* reservation mode is active.
|
|
*/
|
|
if (domain->flags & IRQ_DOMAIN_MSI_NOMASK_QUIRK)
|
|
vflags |= VIRQ_NOMASK_QUIRK;
|
|
}
|
|
|
|
msi_for_each_desc(desc, dev, MSI_DESC_NOTASSOCIATED) {
|
|
ops->set_desc(&arg, desc);
|
|
|
|
virq = __irq_domain_alloc_irqs(domain, -1, desc->nvec_used,
|
|
dev_to_node(dev), &arg, false,
|
|
desc->affinity);
|
|
if (virq < 0)
|
|
return msi_handle_pci_fail(domain, desc, allocated);
|
|
|
|
for (i = 0; i < desc->nvec_used; i++) {
|
|
irq_set_msi_desc_off(virq, i, desc);
|
|
irq_debugfs_copy_devname(virq + i, dev);
|
|
ret = msi_init_virq(domain, virq + i, vflags);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
if (info->flags & MSI_FLAG_DEV_SYSFS) {
|
|
ret = msi_sysfs_populate_desc(dev, desc);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
allocated++;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int msi_domain_add_simple_msi_descs(struct msi_domain_info *info,
|
|
struct device *dev,
|
|
unsigned int num_descs)
|
|
{
|
|
if (!(info->flags & MSI_FLAG_ALLOC_SIMPLE_MSI_DESCS))
|
|
return 0;
|
|
|
|
return msi_add_simple_msi_descs(dev, 0, num_descs);
|
|
}
|
|
|
|
/**
|
|
* msi_domain_alloc_irqs_descs_locked - Allocate interrupts from a MSI interrupt domain
|
|
* @domain: The domain to allocate from
|
|
* @dev: Pointer to device struct of the device for which the interrupts
|
|
* are allocated
|
|
* @nvec: The number of interrupts to allocate
|
|
*
|
|
* Must be invoked from within a msi_lock_descs() / msi_unlock_descs()
|
|
* pair. Use this for MSI irqdomains which implement their own vector
|
|
* allocation/free.
|
|
*
|
|
* Return: %0 on success or an error code.
|
|
*/
|
|
int msi_domain_alloc_irqs_descs_locked(struct irq_domain *domain, struct device *dev,
|
|
int nvec)
|
|
{
|
|
struct msi_domain_info *info = domain->host_data;
|
|
struct msi_domain_ops *ops = info->ops;
|
|
int ret;
|
|
|
|
lockdep_assert_held(&dev->msi.data->mutex);
|
|
|
|
ret = msi_domain_add_simple_msi_descs(info, dev, nvec);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = ops->domain_alloc_irqs(domain, dev, nvec);
|
|
if (ret)
|
|
msi_domain_free_irqs_descs_locked(domain, dev);
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* msi_domain_alloc_irqs - Allocate interrupts from a MSI interrupt domain
|
|
* @domain: The domain to allocate from
|
|
* @dev: Pointer to device struct of the device for which the interrupts
|
|
* are allocated
|
|
* @nvec: The number of interrupts to allocate
|
|
*
|
|
* Return: %0 on success or an error code.
|
|
*/
|
|
int msi_domain_alloc_irqs(struct irq_domain *domain, struct device *dev, int nvec)
|
|
{
|
|
int ret;
|
|
|
|
msi_lock_descs(dev);
|
|
ret = msi_domain_alloc_irqs_descs_locked(domain, dev, nvec);
|
|
msi_unlock_descs(dev);
|
|
return ret;
|
|
}
|
|
|
|
void __msi_domain_free_irqs(struct irq_domain *domain, struct device *dev)
|
|
{
|
|
struct msi_domain_info *info = domain->host_data;
|
|
struct irq_data *irqd;
|
|
struct msi_desc *desc;
|
|
int i;
|
|
|
|
/* Only handle MSI entries which have an interrupt associated */
|
|
msi_for_each_desc(desc, dev, MSI_DESC_ASSOCIATED) {
|
|
/* Make sure all interrupts are deactivated */
|
|
for (i = 0; i < desc->nvec_used; i++) {
|
|
irqd = irq_domain_get_irq_data(domain, desc->irq + i);
|
|
if (irqd && irqd_is_activated(irqd))
|
|
irq_domain_deactivate_irq(irqd);
|
|
}
|
|
|
|
irq_domain_free_irqs(desc->irq, desc->nvec_used);
|
|
if (info->flags & MSI_FLAG_DEV_SYSFS)
|
|
msi_sysfs_remove_desc(dev, desc);
|
|
desc->irq = 0;
|
|
}
|
|
}
|
|
|
|
static void msi_domain_free_msi_descs(struct msi_domain_info *info,
|
|
struct device *dev)
|
|
{
|
|
if (info->flags & MSI_FLAG_FREE_MSI_DESCS)
|
|
msi_free_msi_descs(dev);
|
|
}
|
|
|
|
/**
|
|
* msi_domain_free_irqs_descs_locked - Free interrupts from a MSI interrupt @domain associated to @dev
|
|
* @domain: The domain to managing the interrupts
|
|
* @dev: Pointer to device struct of the device for which the interrupts
|
|
* are free
|
|
*
|
|
* Must be invoked from within a msi_lock_descs() / msi_unlock_descs()
|
|
* pair. Use this for MSI irqdomains which implement their own vector
|
|
* allocation.
|
|
*/
|
|
void msi_domain_free_irqs_descs_locked(struct irq_domain *domain, struct device *dev)
|
|
{
|
|
struct msi_domain_info *info = domain->host_data;
|
|
struct msi_domain_ops *ops = info->ops;
|
|
|
|
lockdep_assert_held(&dev->msi.data->mutex);
|
|
|
|
ops->domain_free_irqs(domain, dev);
|
|
msi_domain_free_msi_descs(info, dev);
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|
}
|
|
|
|
/**
|
|
* msi_domain_free_irqs - Free interrupts from a MSI interrupt @domain associated to @dev
|
|
* @domain: The domain to managing the interrupts
|
|
* @dev: Pointer to device struct of the device for which the interrupts
|
|
* are free
|
|
*/
|
|
void msi_domain_free_irqs(struct irq_domain *domain, struct device *dev)
|
|
{
|
|
msi_lock_descs(dev);
|
|
msi_domain_free_irqs_descs_locked(domain, dev);
|
|
msi_unlock_descs(dev);
|
|
}
|
|
|
|
/**
|
|
* msi_get_domain_info - Get the MSI interrupt domain info for @domain
|
|
* @domain: The interrupt domain to retrieve data from
|
|
*
|
|
* Return: the pointer to the msi_domain_info stored in @domain->host_data.
|
|
*/
|
|
struct msi_domain_info *msi_get_domain_info(struct irq_domain *domain)
|
|
{
|
|
return (struct msi_domain_info *)domain->host_data;
|
|
}
|
|
|
|
#endif /* CONFIG_GENERIC_MSI_IRQ_DOMAIN */
|