[Patch Part1 v8 33/37] x86/irq: Implement callbacks to enable hierarchy irqdomain on IOAPICs

Jiang Liu
2015-04-13T06:11:55Z

Implement required callbacks to prepare for enabling hierarchy irqdomain
on IOAPICs. Later we will clean up IOAPIC code a lot by using hierarchy
irqdomain framework.

Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Joerg Roedel <joro@8bytes.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Rafael J. Wysocki <rjw@rjwysocki.net>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: Yinghai Lu <yinghai@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Grant Likely <grant.likely@linaro.org>
Link: http://lkml.kernel.org/r/1416901802-24211-6-git-send-email-jiang.liu@linux.intel.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Joerg Roedel <jroedel@suse.de>
---
arch/x86/include/asm/io_apic.h | 10 +++
arch/x86/kernel/apic/io_apic.c | 159 +++++++++++++++++++++++++++++++++++++++-
2 files changed, 166 insertions(+), 3 deletions(-)

diff --git a/arch/x86/include/asm/io_apic.h b/arch/x86/include/asm/io_apic.h
index 1fbeda50a77d..ecc192624eaf 100644
--- a/arch/x86/include/asm/io_apic.h
+++ b/arch/x86/include/asm/io_apic.h
@@ -96,6 +96,7 @@ struct IR_IO_APIC_route_entry {
} __attribute__ ((packed));

struct irq_alloc_info;
+struct irq_data;

#define IOAPIC_AUTO -1
#define IOAPIC_EDGE 0
@@ -206,6 +207,15 @@ extern int mp_ioapic_registered(u32 gsi_base);
extern int mp_irqdomain_map(struct irq_domain *domain, unsigned int virq,
irq_hw_number_t hwirq);
extern void mp_irqdomain_unmap(struct irq_domain *domain, unsigned int virq);
+extern int mp_irqdomain_alloc(struct irq_domain *domain, unsigned int virq,
+ unsigned int nr_irqs, void *arg);
+extern void mp_irqdomain_free(struct irq_domain *domain, unsigned int virq,
+ unsigned int nr_irqs);
+extern void mp_irqdomain_activate(struct irq_domain *domain,
+ struct irq_data *irq_data);
+extern void mp_irqdomain_deactivate(struct irq_domain *domain,
+ struct irq_data *irq_data);
+extern int mp_irqdomain_ioapic_idx(struct irq_domain *domain);
extern void ioapic_set_alloc_attr(struct irq_alloc_info *info,
int node, int trigger, int polarity);
extern int mp_set_gsi_attr(u32 gsi, int trigger, int polarity, int node);
diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index 5c953bb96ecf..3406dbec1570 100644
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -78,6 +78,13 @@ static DEFINE_MUTEX(ioapic_mutex);
static unsigned int ioapic_dynirq_base;
static int ioapic_initialized;

+struct mp_chip_data {
+ struct IO_APIC_route_entry entry;
+ int trigger;
+ int polarity;
+ bool isa_irq;
+};
+
struct mp_pin_info {
int trigger;
int polarity;
@@ -949,11 +956,28 @@ void ioapic_set_alloc_attr(struct irq_alloc_info *info, int node,
info->ioapic_valid = 1;
}

+static void mp_register_handler(unsigned int irq, unsigned long trigger)
+{
+ irq_flow_handler_t hdl;
+ bool fasteoi;
+
+ if (trigger) {
+ irq_set_status_flags(irq, IRQ_LEVEL);
+ fasteoi = true;
+ } else {
+ irq_clear_status_flags(irq, IRQ_LEVEL);
+ fasteoi = false;
+ }
+
+ hdl = fasteoi ? handle_fasteoi_irq : handle_edge_irq;
+ __irq_set_handler(irq, hdl, 0, fasteoi ? "fasteoi" : "edge");
+}
+
static int alloc_irq_from_domain(struct irq_domain *domain, u32 gsi, int pin,
struct irq_alloc_info *info)
{
int irq = -1;
- int ioapic = (int)(long)domain->host_data;
+ int ioapic = mp_irqdomain_ioapic_idx(domain);
int type = ioapics[ioapic].irqdomain_cfg.type;

switch (type) {
@@ -3029,7 +3053,7 @@ static inline void set_io_apic_irq_attr(struct io_apic_irq_attr *irq_attr,
int mp_irqdomain_map(struct irq_domain *domain, unsigned int virq,
irq_hw_number_t hwirq)
{
- int ioapic = (int)(long)domain->host_data;
+ int ioapic = mp_irqdomain_ioapic_idx(domain);
struct mp_pin_info *info = mp_pin_info(ioapic, hwirq);
struct io_apic_irq_attr attr;

@@ -3067,7 +3091,7 @@ void mp_irqdomain_unmap(struct irq_domain *domain, unsigned int virq)
{
struct irq_data *data = irq_get_irq_data(virq);
struct irq_cfg *cfg = irq_cfg(virq);
- int ioapic = (int)(long)domain->host_data;
+ int ioapic = mp_irqdomain_ioapic_idx(domain);
int pin = (int)data->hwirq;

ioapic_mask_entry(ioapic, pin);
@@ -3076,6 +3100,130 @@ void mp_irqdomain_unmap(struct irq_domain *domain, unsigned int virq)
arch_teardown_hwirq(virq);
}

+static void mp_irqdomain_get_attr(u32 gsi, struct mp_chip_data *data,
+ struct irq_alloc_info *info)
+{
+ if (info && info->ioapic_valid) {
+ data->trigger = info->ioapic_trigger;
+ data->polarity = info->ioapic_polarity;
+ } else if (acpi_get_override_irq(gsi, &data->trigger,
+ &data->polarity) < 0) {
+ /* PCI interrupts are always polarity one level triggered. */
+ data->trigger = 1;
+ data->polarity = 1;
+ }
+}
+
+static void mp_setup_entry(struct irq_cfg *cfg, struct mp_chip_data *data,
+ struct IO_APIC_route_entry *entry)
+{
+ memset(entry, 0, sizeof(*entry));
+ entry->delivery_mode = apic->irq_delivery_mode;
+ entry->dest_mode = apic->irq_dest_mode;
+ entry->dest = cfg->dest_apicid;
+ entry->vector = cfg->vector;
+ entry->mask = 0; /* enable IRQ */
+ entry->trigger = data->trigger;
+ entry->polarity = data->polarity;
+ /*
+ * Mask level triggered irqs.
+ * Use IRQ_DELAYED_DISABLE for edge triggered irqs.
+ */
+ if (data->trigger)
+ entry->mask = 1;
+}
+
+int mp_irqdomain_alloc(struct irq_domain *domain, unsigned int virq,
+ unsigned int nr_irqs, void *arg)
+{
+ int ret, ioapic, pin;
+ struct irq_cfg *cfg;
+ struct irq_data *irq_data;
+ struct mp_chip_data *data;
+ struct irq_alloc_info *info = arg;
+
+ if (!info || nr_irqs > 1)
+ return -EINVAL;
+ irq_data = irq_domain_get_irq_data(domain, virq);
+ if (!irq_data)
+ return -EINVAL;
+
+ ioapic = mp_irqdomain_ioapic_idx(domain);
+ pin = info->ioapic_pin;
+ if (irq_find_mapping(domain, (irq_hw_number_t)pin) > 0)
+ return -EEXIST;
+
+ data = kzalloc(sizeof(*data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ info->ioapic_entry = &data->entry;
+ ret = irq_domain_alloc_irqs_parent(domain, virq, nr_irqs, info);
+ if (ret < 0) {
+ kfree(data);
+ return ret;
+ }
+
+ irq_data->hwirq = info->ioapic_pin;
+ irq_data->chip = &ioapic_chip;
+ irq_data->chip_data = data;
+ mp_irqdomain_get_attr(mp_pin_to_gsi(ioapic, pin), data, info);
+
+ cfg = irqd_cfg(irq_data);
+ add_pin_to_irq_node(cfg, info->ioapic_node, ioapic, pin);
+ if (info->ioapic_entry)
+ mp_setup_entry(cfg, data, info->ioapic_entry);
+ mp_register_handler(virq, data->trigger);
+ if (virq < nr_legacy_irqs())
+ legacy_pic->mask(virq);
+
+ apic_printk(APIC_VERBOSE, KERN_DEBUG
+ "IOAPIC[%d]: Set routing entry (%d-%d -> 0x%x -> IRQ %d Mode:%i Active:%i Dest:%d)\n",
+ ioapic, mpc_ioapic_id(ioapic), pin, cfg->vector,
+ virq, data->trigger, data->polarity, cfg->dest_apicid);
+
+ return 0;
+}
+
+void mp_irqdomain_free(struct irq_domain *domain, unsigned int virq,
+ unsigned int nr_irqs)
+{
+ struct irq_cfg *cfg = irq_cfg(virq);
+ struct irq_data *irq_data;
+
+ BUG_ON(nr_irqs != 1);
+ irq_data = irq_domain_get_irq_data(domain, virq);
+ if (irq_data && irq_data->chip_data) {
+ __remove_pin_from_irq(cfg, mp_irqdomain_ioapic_idx(domain),
+ (int)irq_data->hwirq);
+ WARN_ON(!list_empty(&cfg->irq_2_pin));
+ kfree(irq_data->chip_data);
+ }
+ irq_domain_free_irqs_top(domain, virq, nr_irqs);
+}
+
+void mp_irqdomain_activate(struct irq_domain *domain,
+ struct irq_data *irq_data)
+{
+ unsigned long flags;
+ struct irq_pin_list *entry;
+ struct mp_chip_data *data = irq_data->chip_data;
+ struct irq_cfg *cfg = irqd_cfg(irq_data);
+
+ raw_spin_lock_irqsave(&ioapic_lock, flags);
+ for_each_irq_pin(entry, cfg->irq_2_pin)
+ __ioapic_write_entry(entry->apic, entry->pin, data->entry);
+ raw_spin_unlock_irqrestore(&ioapic_lock, flags);
+}
+
+void mp_irqdomain_deactivate(struct irq_domain *domain,
+ struct irq_data *irq_data)
+{
+ /* It won't be called for IRQ with multiple IOAPIC pins associated */
+ ioapic_mask_entry(mp_irqdomain_ioapic_idx(domain),
+ (int)irq_data->hwirq);
+}
+
int mp_set_gsi_attr(u32 gsi, int trigger, int polarity, int node)
{
int ret = 0;
@@ -3104,3 +3252,8 @@ int mp_set_gsi_attr(u32 gsi, int trigger, int polarity, int node)

return ret;
}
+
+int mp_irqdomain_ioapic_idx(struct irq_domain *domain)
+{
+ return (int)(long)domain->host_data;
+}
--
1.7.10.4