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Subject[tip:x86/apic] x86, irq: Enhance mp_register_ioapic() to support irqdomain
Commit-ID:  44767bfaaed782d6d635ecbb13f3980041e6f33e
Gitweb: http://git.kernel.org/tip/44767bfaaed782d6d635ecbb13f3980041e6f33e
Author: Jiang Liu <jiang.liu@linux.intel.com>
AuthorDate: Mon, 9 Jun 2014 16:19:53 +0800
Committer: Thomas Gleixner <tglx@linutronix.de>
CommitDate: Sat, 21 Jun 2014 23:05:42 +0200

x86, irq: Enhance mp_register_ioapic() to support irqdomain

Enhance function mp_register_ioapic() to support irqdomain.
When registering IOAPIC, caller may provide callbacks and parameters
for creating irqdomain. The IOAPIC core will create irqdomain later
if caller has passed in corresponding parameters.

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: Paul Gortmaker <paul.gortmaker@windriver.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: sfi-devel@simplefirmware.org
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Grant Likely <grant.likely@linaro.org>
Cc: Rafael J. Wysocki <rjw@rjwysocki.net>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: Yinghai Lu <yinghai@kernel.org>
Cc: Len Brown <len.brown@intel.com>
Cc: Pavel Machek <pavel@ucw.cz>
Cc: Rob Herring <rob.herring@calxeda.com>
Cc: Michal Simek <monstr@monstr.eu>
Cc: Tony Lindgren <tony@atomide.com>
Link: http://lkml.kernel.org/r/1402302011-23642-25-git-send-email-jiang.liu@linux.intel.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
arch/x86/include/asm/io_apic.h | 3 ++-
arch/x86/kernel/acpi/boot.c | 2 +-
arch/x86/kernel/apic/io_apic.c | 42 +++++++++++++++++++++++++++++++++++++++++-
arch/x86/kernel/devicetree.c | 2 +-
arch/x86/kernel/mpparse.c | 2 +-
arch/x86/platform/sfi/sfi.c | 2 +-
6 files changed, 47 insertions(+), 6 deletions(-)

diff --git a/arch/x86/include/asm/io_apic.h b/arch/x86/include/asm/io_apic.h
index 64c6e34..3e4bea3 100644
--- a/arch/x86/include/asm/io_apic.h
+++ b/arch/x86/include/asm/io_apic.h
@@ -190,7 +190,8 @@ extern int mp_find_ioapic(u32 gsi);
extern int mp_find_ioapic_pin(int ioapic, u32 gsi);
extern u32 mp_pin_to_gsi(int ioapic, int pin);
extern int mp_map_gsi_to_irq(u32 gsi, unsigned int flags);
-extern void __init mp_register_ioapic(int id, u32 address, u32 gsi_base);
+extern void __init mp_register_ioapic(int id, u32 address, u32 gsi_base,
+ struct ioapic_domain_cfg *cfg);
extern void __init pre_init_apic_IRQ0(void);

extern void mp_save_irq(struct mpc_intsrc *m);
diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c
index d6635ba..f86b4ba 100644
--- a/arch/x86/kernel/acpi/boot.c
+++ b/arch/x86/kernel/acpi/boot.c
@@ -462,7 +462,7 @@ acpi_parse_ioapic(struct acpi_subtable_header * header, const unsigned long end)
acpi_table_print_madt_entry(header);

mp_register_ioapic(ioapic->id,
- ioapic->address, ioapic->global_irq_base);
+ ioapic->address, ioapic->global_irq_base, NULL);

return 0;
}
diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index 51ce80004..563f450 100644
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -85,6 +85,7 @@ int sis_apic_bug = -1;
static DEFINE_RAW_SPINLOCK(ioapic_lock);
static DEFINE_RAW_SPINLOCK(vector_lock);
static DEFINE_MUTEX(ioapic_mutex);
+static unsigned int ioapic_dynirq_base;

static struct ioapic {
/*
@@ -2920,8 +2921,35 @@ out:
*/
#define PIC_IRQS (1UL << PIC_CASCADE_IR)

+static int mp_irqdomain_create(int ioapic)
+{
+ int hwirqs = mp_ioapic_pin_count(ioapic);
+ struct ioapic *ip = &ioapics[ioapic];
+ struct ioapic_domain_cfg *cfg = &ip->irqdomain_cfg;
+ struct mp_ioapic_gsi *gsi_cfg = mp_ioapic_gsi_routing(ioapic);
+
+ if (cfg->type == IOAPIC_DOMAIN_INVALID)
+ return 0;
+
+ ip->irqdomain = irq_domain_add_linear(cfg->dev, hwirqs, cfg->ops,
+ (void *)(long)ioapic);
+ if(!ip->irqdomain)
+ return -ENOMEM;
+
+ if (cfg->type == IOAPIC_DOMAIN_LEGACY ||
+ cfg->type == IOAPIC_DOMAIN_STRICT)
+ ioapic_dynirq_base = max(ioapic_dynirq_base,
+ gsi_cfg->gsi_end + 1);
+
+ if (gsi_cfg->gsi_base == 0)
+ irq_set_default_host(ip->irqdomain);
+
+ return 0;
+}
+
void __init setup_IO_APIC(void)
{
+ int ioapic;

/*
* calling enable_IO_APIC() is moved to setup_local_APIC for BP
@@ -2929,6 +2957,9 @@ void __init setup_IO_APIC(void)
io_apic_irqs = nr_legacy_irqs() ? ~PIC_IRQS : ~0UL;

apic_printk(APIC_VERBOSE, "ENABLING IO-APIC IRQs\n");
+ for_each_ioapic(ioapic)
+ BUG_ON(mp_irqdomain_create(ioapic));
+
/*
* Set up IO-APIC IRQ routing.
*/
@@ -3437,6 +3468,9 @@ unsigned int arch_dynirq_lower_bound(unsigned int from)
{
unsigned int min = gsi_top + nr_legacy_irqs();

+ if (ioapic_dynirq_base)
+ return ioapic_dynirq_base;
+
return from < min ? min : from;
}

@@ -3812,7 +3846,8 @@ static __init int bad_ioapic_register(int idx)
return 0;
}

-void __init mp_register_ioapic(int id, u32 address, u32 gsi_base)
+void __init mp_register_ioapic(int id, u32 address, u32 gsi_base,
+ struct ioapic_domain_cfg *cfg)
{
int idx = 0;
int entries;
@@ -3826,6 +3861,11 @@ void __init mp_register_ioapic(int id, u32 address, u32 gsi_base)
ioapics[idx].mp_config.type = MP_IOAPIC;
ioapics[idx].mp_config.flags = MPC_APIC_USABLE;
ioapics[idx].mp_config.apicaddr = address;
+ ioapics[idx].irqdomain = NULL;
+ if (cfg)
+ ioapics[idx].irqdomain_cfg = *cfg;
+ else
+ ioapics[idx].irqdomain_cfg.type = IOAPIC_DOMAIN_INVALID;

set_fixmap_nocache(FIX_IO_APIC_BASE_0 + idx, address);

diff --git a/arch/x86/kernel/devicetree.c b/arch/x86/kernel/devicetree.c
index b468005..d2c53fe 100644
--- a/arch/x86/kernel/devicetree.c
+++ b/arch/x86/kernel/devicetree.c
@@ -177,7 +177,7 @@ static void __init dtb_add_ioapic(struct device_node *dn)
dn->full_name);
return;
}
- mp_register_ioapic(++ioapic_id, r.start, gsi_top);
+ mp_register_ioapic(++ioapic_id, r.start, gsi_top, NULL);
}

static void __init dtb_ioapic_setup(void)
diff --git a/arch/x86/kernel/mpparse.c b/arch/x86/kernel/mpparse.c
index b10e113..ea8595e 100644
--- a/arch/x86/kernel/mpparse.c
+++ b/arch/x86/kernel/mpparse.c
@@ -115,7 +115,7 @@ static void __init MP_bus_info(struct mpc_bus *m)
static void __init MP_ioapic_info(struct mpc_ioapic *m)
{
if (m->flags & MPC_APIC_USABLE)
- mp_register_ioapic(m->apicid, m->apicaddr, gsi_top);
+ mp_register_ioapic(m->apicid, m->apicaddr, gsi_top, NULL);
}

static void __init print_mp_irq_info(struct mpc_intsrc *mp_irq)
diff --git a/arch/x86/platform/sfi/sfi.c b/arch/x86/platform/sfi/sfi.c
index bcd1a70..8f2f789 100644
--- a/arch/x86/platform/sfi/sfi.c
+++ b/arch/x86/platform/sfi/sfi.c
@@ -82,7 +82,7 @@ static int __init sfi_parse_ioapic(struct sfi_table_header *table)
pentry = (struct sfi_apic_table_entry *)sb->pentry;

for (i = 0; i < num; i++) {
- mp_register_ioapic(i, pentry->phys_addr, gsi_top);
+ mp_register_ioapic(i, pentry->phys_addr, gsi_top, NULL);
pentry++;
}


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