mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-30 12:49:36 +00:00
![Thomas Gleixner](/assets/img/avatar_default.png)
No point to expose this to the world. The only legitimate user is the core code. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Jiang Liu <jiang.liu@linux.intel.com> Cc: Marc Zyngier <marc.zyngier@arm.com>
330 lines
8.5 KiB
C
330 lines
8.5 KiB
C
/*
|
|
* linux/kernel/irq/msi.c
|
|
*
|
|
* Copyright (C) 2014 Intel Corp.
|
|
* Author: Jiang Liu <jiang.liu@linux.intel.com>
|
|
*
|
|
* This file is licensed under GPLv2.
|
|
*
|
|
* This file contains common code to support Message Signalled Interrupt for
|
|
* PCI compatible and non PCI compatible devices.
|
|
*/
|
|
#include <linux/types.h>
|
|
#include <linux/device.h>
|
|
#include <linux/irq.h>
|
|
#include <linux/irqdomain.h>
|
|
#include <linux/msi.h>
|
|
|
|
/* Temparory solution for building, will be removed later */
|
|
#include <linux/pci.h>
|
|
|
|
void __get_cached_msi_msg(struct msi_desc *entry, struct msi_msg *msg)
|
|
{
|
|
*msg = entry->msg;
|
|
}
|
|
|
|
void get_cached_msi_msg(unsigned int irq, struct msi_msg *msg)
|
|
{
|
|
struct msi_desc *entry = irq_get_msi_desc(irq);
|
|
|
|
__get_cached_msi_msg(entry, msg);
|
|
}
|
|
EXPORT_SYMBOL_GPL(get_cached_msi_msg);
|
|
|
|
#ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN
|
|
static inline void irq_chip_write_msi_msg(struct irq_data *data,
|
|
struct msi_msg *msg)
|
|
{
|
|
data->chip->irq_write_msi_msg(data, msg);
|
|
}
|
|
|
|
/**
|
|
* msi_domain_set_affinity - Generic affinity setter function for MSI domains
|
|
* @irq_data: The irq data associated to the interrupt
|
|
* @mask: The affinity mask to set
|
|
* @force: Flag to enforce setting (disable online checks)
|
|
*
|
|
* Intended to be used by MSI interrupt controllers which are
|
|
* implemented with hierarchical domains.
|
|
*/
|
|
int msi_domain_set_affinity(struct irq_data *irq_data,
|
|
const struct cpumask *mask, bool force)
|
|
{
|
|
struct irq_data *parent = irq_data->parent_data;
|
|
struct msi_msg msg;
|
|
int ret;
|
|
|
|
ret = parent->chip->irq_set_affinity(parent, mask, force);
|
|
if (ret >= 0 && ret != IRQ_SET_MASK_OK_DONE) {
|
|
BUG_ON(irq_chip_compose_msi_msg(irq_data, &msg));
|
|
irq_chip_write_msi_msg(irq_data, &msg);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void msi_domain_activate(struct irq_domain *domain,
|
|
struct irq_data *irq_data)
|
|
{
|
|
struct msi_msg msg;
|
|
|
|
BUG_ON(irq_chip_compose_msi_msg(irq_data, &msg));
|
|
irq_chip_write_msi_msg(irq_data, &msg);
|
|
}
|
|
|
|
static void msi_domain_deactivate(struct irq_domain *domain,
|
|
struct irq_data *irq_data)
|
|
{
|
|
struct msi_msg msg;
|
|
|
|
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;
|
|
|
|
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 struct irq_domain_ops msi_domain_ops = {
|
|
.alloc = msi_domain_alloc,
|
|
.free = msi_domain_free,
|
|
.activate = msi_domain_activate,
|
|
.deactivate = msi_domain_deactivate,
|
|
};
|
|
|
|
#ifdef GENERIC_MSI_DOMAIN_OPS
|
|
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;
|
|
}
|
|
#else
|
|
#define msi_domain_ops_get_hwirq NULL
|
|
#define msi_domain_ops_prepare NULL
|
|
#define msi_domain_ops_set_desc NULL
|
|
#endif /* !GENERIC_MSI_DOMAIN_OPS */
|
|
|
|
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,
|
|
};
|
|
|
|
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->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);
|
|
if (!chip->irq_mask)
|
|
chip->irq_mask = pci_msi_mask_irq;
|
|
if (!chip->irq_unmask)
|
|
chip->irq_unmask = pci_msi_unmask_irq;
|
|
if (!chip->irq_set_affinity)
|
|
chip->irq_set_affinity = msi_domain_set_affinity;
|
|
}
|
|
|
|
/**
|
|
* msi_create_irq_domain - Create a MSI interrupt domain
|
|
* @of_node: Optional device-tree node of the interrupt controller
|
|
* @info: MSI domain info
|
|
* @parent: Parent irq domain
|
|
*/
|
|
struct irq_domain *msi_create_irq_domain(struct device_node *node,
|
|
struct msi_domain_info *info,
|
|
struct irq_domain *parent)
|
|
{
|
|
if (info->flags & MSI_FLAG_USE_DEF_DOM_OPS)
|
|
msi_domain_update_dom_ops(info);
|
|
if (info->flags & MSI_FLAG_USE_DEF_CHIP_OPS)
|
|
msi_domain_update_chip_ops(info);
|
|
|
|
return irq_domain_add_hierarchy(parent, 0, 0, node, &msi_domain_ops,
|
|
info);
|
|
}
|
|
|
|
/**
|
|
* 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
|
|
*
|
|
* Returns 0 on success or an error code.
|
|
*/
|
|
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;
|
|
struct msi_desc *desc;
|
|
int i, ret, virq = -1;
|
|
|
|
ret = ops->msi_check(domain, info, dev);
|
|
if (ret == 0)
|
|
ret = ops->msi_prepare(domain, dev, nvec, &arg);
|
|
if (ret)
|
|
return ret;
|
|
|
|
for_each_msi_entry(desc, dev) {
|
|
ops->set_desc(&arg, desc);
|
|
if (info->flags & MSI_FLAG_IDENTITY_MAP)
|
|
virq = (int)ops->get_hwirq(info, &arg);
|
|
else
|
|
virq = -1;
|
|
|
|
virq = __irq_domain_alloc_irqs(domain, virq, desc->nvec_used,
|
|
dev_to_node(dev), &arg, false);
|
|
if (virq < 0) {
|
|
ret = -ENOSPC;
|
|
if (ops->handle_error)
|
|
ret = ops->handle_error(domain, desc, ret);
|
|
if (ops->msi_finish)
|
|
ops->msi_finish(&arg, ret);
|
|
return ret;
|
|
}
|
|
|
|
for (i = 0; i < desc->nvec_used; i++)
|
|
irq_set_msi_desc_off(virq, i, desc);
|
|
}
|
|
|
|
if (ops->msi_finish)
|
|
ops->msi_finish(&arg, 0);
|
|
|
|
for_each_msi_entry(desc, dev) {
|
|
if (desc->nvec_used == 1)
|
|
dev_dbg(dev, "irq %d for MSI\n", virq);
|
|
else
|
|
dev_dbg(dev, "irq [%d-%d] for MSI\n",
|
|
virq, virq + desc->nvec_used - 1);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* msi_domain_free_irqs - Free interrupts from a MSI interrupt @domain associated tp @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)
|
|
{
|
|
struct msi_desc *desc;
|
|
|
|
for_each_msi_entry(desc, dev) {
|
|
irq_domain_free_irqs(desc->irq, desc->nvec_used);
|
|
desc->irq = 0;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* msi_get_domain_info - Get the MSI interrupt domain info for @domain
|
|
* @domain: The interrupt domain to retrieve data from
|
|
*
|
|
* Returns 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 */
|