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>

1 files changed, 41 insertions, 1 deletions

diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index 51ce80004a78..563f4504f54d 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);