*
* Copyright (C) 1997, 1998, 1999, 2000, 2009 Ingo Molnar, Hajnalka Szabo
* Moved from arch/x86/kernel/apic/io_apic.c.
+ * Jiang Liu <jiang.liu@linux.intel.com>
+ * Add support of hierarchical irqdomain
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
#include <asm/apic.h>
#include <asm/hypertransport.h>
+static struct irq_domain *htirq_domain;
+
/*
* Hypertransport interrupt support
*/
-static void target_ht_irq(unsigned int irq, unsigned int dest, u8 vector)
-{
- struct ht_irq_msg msg;
-
- fetch_ht_irq_msg(irq, &msg);
-
- msg.address_lo &= ~(HT_IRQ_LOW_VECTOR_MASK | HT_IRQ_LOW_DEST_ID_MASK);
- msg.address_hi &= ~(HT_IRQ_HIGH_DEST_ID_MASK);
-
- msg.address_lo |= HT_IRQ_LOW_VECTOR(vector) | HT_IRQ_LOW_DEST_ID(dest);
- msg.address_hi |= HT_IRQ_HIGH_DEST_ID(dest);
-
- write_ht_irq_msg(irq, &msg);
-}
-
static int
ht_set_affinity(struct irq_data *data, const struct cpumask *mask, bool force)
{
- struct irq_cfg *cfg = irqd_cfg(data);
- unsigned int dest;
+ struct irq_data *parent = data->parent_data;
int ret;
- ret = apic_set_affinity(data, mask, &dest);
- if (ret)
- return ret;
-
- target_ht_irq(data->irq, dest, cfg->vector);
- return IRQ_SET_MASK_OK_NOCOPY;
+ ret = parent->chip->irq_set_affinity(parent, mask, force);
+ if (ret >= 0) {
+ struct ht_irq_msg msg;
+ struct irq_cfg *cfg = irqd_cfg(data);
+
+ fetch_ht_irq_msg(data->irq, &msg);
+ msg.address_lo &= ~(HT_IRQ_LOW_VECTOR_MASK |
+ HT_IRQ_LOW_DEST_ID_MASK);
+ msg.address_lo |= HT_IRQ_LOW_VECTOR(cfg->vector) |
+ HT_IRQ_LOW_DEST_ID(cfg->dest_apicid);
+ msg.address_hi &= ~(HT_IRQ_HIGH_DEST_ID_MASK);
+ msg.address_hi |= HT_IRQ_HIGH_DEST_ID(cfg->dest_apicid);
+ write_ht_irq_msg(data->irq, &msg);
+ }
+
+ return ret;
}
static struct irq_chip ht_irq_chip = {
.name = "PCI-HT",
.irq_mask = mask_ht_irq,
.irq_unmask = unmask_ht_irq,
- .irq_ack = apic_ack_edge,
+ .irq_ack = irq_chip_ack_parent,
.irq_set_affinity = ht_set_affinity,
- .irq_retrigger = apic_retrigger_irq,
+ .irq_retrigger = irq_chip_retrigger_hierarchy,
.flags = IRQCHIP_SKIP_SET_WAKE,
};
-int arch_alloc_ht_irq(struct pci_dev *dev)
+static int htirq_domain_alloc(struct irq_domain *domain, unsigned int virq,
+ unsigned int nr_irqs, void *arg)
{
- return irq_domain_alloc_irqs(NULL, 1, dev_to_node(&dev->dev), NULL);
+ struct ht_irq_cfg *ht_cfg;
+ struct irq_alloc_info *info = arg;
+ struct pci_dev *dev;
+ irq_hw_number_t hwirq;
+ int ret;
+
+ if (nr_irqs > 1 || !info)
+ return -EINVAL;
+
+ dev = info->ht_dev;
+ hwirq = (info->ht_idx & 0xFF) |
+ PCI_DEVID(dev->bus->number, dev->devfn) << 8 |
+ (pci_domain_nr(dev->bus) & 0xFFFFFFFF) << 24;
+ if (irq_find_mapping(domain, hwirq) > 0)
+ return -EEXIST;
+
+ ht_cfg = kmalloc(sizeof(*ht_cfg), GFP_KERNEL);
+ if (!ht_cfg)
+ return -ENOMEM;
+
+ ret = irq_domain_alloc_irqs_parent(domain, virq, nr_irqs, info);
+ if (ret < 0) {
+ kfree(ht_cfg);
+ return ret;
+ }
+
+ /* Initialize msg to a value that will never match the first write. */
+ ht_cfg->msg.address_lo = 0xffffffff;
+ ht_cfg->msg.address_hi = 0xffffffff;
+ ht_cfg->dev = info->ht_dev;
+ ht_cfg->update = info->ht_update;
+ ht_cfg->pos = info->ht_pos;
+ ht_cfg->idx = 0x10 + (info->ht_idx * 2);
+ irq_domain_set_info(domain, virq, hwirq, &ht_irq_chip, ht_cfg,
+ handle_edge_irq, ht_cfg, "edge");
+
+ return 0;
}
-void arch_free_ht_irq(int irq)
+static void htirq_domain_free(struct irq_domain *domain, unsigned int virq,
+ unsigned int nr_irqs)
{
- irq_domain_free_irqs(irq, 1);
+ struct irq_data *irq_data = irq_domain_get_irq_data(domain, virq);
+
+ BUG_ON(nr_irqs != 1);
+ kfree(irq_data->chip_data);
+ irq_domain_free_irqs_top(domain, virq, nr_irqs);
}
-int arch_setup_ht_irq(unsigned int irq, struct pci_dev *dev)
+static void htirq_domain_activate(struct irq_domain *domain,
+ struct irq_data *irq_data)
{
- struct irq_cfg *cfg;
struct ht_irq_msg msg;
+ struct irq_cfg *cfg = irqd_cfg(irq_data);
- if (disable_apic)
- return -ENXIO;
-
- cfg = irq_cfg(irq);
msg.address_hi = HT_IRQ_HIGH_DEST_ID(cfg->dest_apicid);
-
msg.address_lo =
HT_IRQ_LOW_BASE |
HT_IRQ_LOW_DEST_ID(cfg->dest_apicid) |
HT_IRQ_LOW_MT_FIXED :
HT_IRQ_LOW_MT_ARBITRATED) |
HT_IRQ_LOW_IRQ_MASKED;
+ write_ht_irq_msg(irq_data->irq, &msg);
+}
- write_ht_irq_msg(irq, &msg);
+static void htirq_domain_deactivate(struct irq_domain *domain,
+ struct irq_data *irq_data)
+{
+ struct ht_irq_msg msg;
- irq_set_chip_and_handler_name(irq, &ht_irq_chip,
- handle_edge_irq, "edge");
+ memset(&msg, 0, sizeof(msg));
+ write_ht_irq_msg(irq_data->irq, &msg);
+}
- dev_dbg(&dev->dev, "irq %d for HT\n", irq);
+static struct irq_domain_ops htirq_domain_ops = {
+ .alloc = htirq_domain_alloc,
+ .free = htirq_domain_free,
+ .activate = htirq_domain_activate,
+ .deactivate = htirq_domain_deactivate,
+};
- return 0;
+void arch_init_htirq_domain(struct irq_domain *parent)
+{
+ if (disable_apic)
+ return;
+
+ htirq_domain = irq_domain_add_tree(NULL, &htirq_domain_ops, NULL);
+ if (!htirq_domain)
+ pr_warn("failed to initialize irqdomain for HTIRQ.\n");
+ else
+ htirq_domain->parent = parent;
+}
+
+int arch_setup_ht_irq(int idx, int pos, struct pci_dev *dev,
+ ht_irq_update_t *update)
+{
+ struct irq_alloc_info info;
+
+ if (!htirq_domain)
+ return -ENOSYS;
+
+ init_irq_alloc_info(&info, NULL);
+ info.ht_idx = idx;
+ info.ht_pos = pos;
+ info.ht_dev = dev;
+ info.ht_update = update;
+
+ return irq_domain_alloc_irqs(htirq_domain, 1, dev_to_node(&dev->dev),
+ &info);
+}
+
+void arch_teardown_ht_irq(unsigned int irq)
+{
+ irq_domain_free_irqs(irq, 1);
}
*/
static DEFINE_SPINLOCK(ht_irq_lock);
-struct ht_irq_cfg {
- struct pci_dev *dev;
- /* Update callback used to cope with buggy hardware */
- ht_irq_update_t *update;
- unsigned pos;
- unsigned idx;
- struct ht_irq_msg msg;
-};
-
-
void write_ht_irq_msg(unsigned int irq, struct ht_irq_msg *msg)
{
struct ht_irq_cfg *cfg = irq_get_handler_data(irq);
unsigned long flags;
+
spin_lock_irqsave(&ht_irq_lock, flags);
if (cfg->msg.address_lo != msg->address_lo) {
pci_write_config_byte(cfg->dev, cfg->pos + 2, cfg->idx);
void fetch_ht_irq_msg(unsigned int irq, struct ht_irq_msg *msg)
{
struct ht_irq_cfg *cfg = irq_get_handler_data(irq);
+
*msg = cfg->msg;
}
*/
int __ht_create_irq(struct pci_dev *dev, int idx, ht_irq_update_t *update)
{
- struct ht_irq_cfg *cfg;
int max_irq, pos, irq;
unsigned long flags;
u32 data;
if (idx > max_irq)
return -EINVAL;
- cfg = kmalloc(sizeof(*cfg), GFP_KERNEL);
- if (!cfg)
- return -ENOMEM;
-
- cfg->dev = dev;
- cfg->update = update;
- cfg->pos = pos;
- cfg->idx = 0x10 + (idx * 2);
- /* Initialize msg to a value that will never match the first write. */
- cfg->msg.address_lo = 0xffffffff;
- cfg->msg.address_hi = 0xffffffff;
-
- irq = arch_alloc_ht_irq(dev);
- if (irq <= 0) {
- kfree(cfg);
- return -EBUSY;
- }
- irq_set_handler_data(irq, cfg);
-
- if (arch_setup_ht_irq(irq, dev) < 0) {
- ht_destroy_irq(irq);
- return -EBUSY;
- }
+ irq = arch_setup_ht_irq(idx, pos, dev, update);
+ if (irq > 0)
+ dev_dbg(&dev->dev, "irq %d for HT\n", irq);
return irq;
}
*/
void ht_destroy_irq(unsigned int irq)
{
- struct ht_irq_cfg *cfg;
-
- cfg = irq_get_handler_data(irq);
- irq_set_chip(irq, NULL);
- irq_set_handler_data(irq, NULL);
- arch_free_ht_irq(irq);
- kfree(cfg);
+ arch_teardown_ht_irq(irq);
}
EXPORT_SYMBOL(ht_destroy_irq);
#ifndef LINUX_HTIRQ_H
#define LINUX_HTIRQ_H
+struct pci_dev;
+struct irq_data;
+
struct ht_irq_msg {
u32 address_lo; /* low 32 bits of the ht irq message */
u32 address_hi; /* high 32 bits of the it irq message */
};
+typedef void (ht_irq_update_t)(struct pci_dev *dev, int irq,
+ struct ht_irq_msg *msg);
+
+struct ht_irq_cfg {
+ struct pci_dev *dev;
+ /* Update callback used to cope with buggy hardware */
+ ht_irq_update_t *update;
+ unsigned pos;
+ unsigned idx;
+ struct ht_irq_msg msg;
+};
+
/* Helper functions.. */
void fetch_ht_irq_msg(unsigned int irq, struct ht_irq_msg *msg);
void write_ht_irq_msg(unsigned int irq, struct ht_irq_msg *msg);
-struct irq_data;
void mask_ht_irq(struct irq_data *data);
void unmask_ht_irq(struct irq_data *data);
/* The arch hook for getting things started */
-int arch_setup_ht_irq(unsigned int irq, struct pci_dev *dev);
-int arch_alloc_ht_irq(struct pci_dev *dev);
-void arch_free_ht_irq(int irq);
+int arch_setup_ht_irq(int idx, int pos, struct pci_dev *dev,
+ ht_irq_update_t *update);
+void arch_teardown_ht_irq(unsigned int irq);
/* For drivers of buggy hardware */
-typedef void (ht_irq_update_t)(struct pci_dev *dev, int irq,
- struct ht_irq_msg *msg);
int __ht_create_irq(struct pci_dev *dev, int idx, ht_irq_update_t *update);
#endif /* LINUX_HTIRQ_H */
projects / cascardo / linux.git / commitdiff