x86, irq: Prefer assigned ID in APIC ID register for x86_64

Perfer the assigned ID in APIC ID register for x86_64 if it's still
available.

[ tglx: Added comments ]

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
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: Sebastian Andrzej Siewior <sebastian@breakpoint.cc>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Rafael J. Wysocki <rjw@rjwysocki.net>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Grant Likely <grant.likely@linaro.org>
Cc: Prarit Bhargava <prarit@redhat.com>
Link: http://lkml.kernel.org/r/1414387308-27148-11-git-send-email-jiang.liu@linux.intel.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index 654b69b836b6a8b3899246723646d22c97c9ab3a..86fd2865ff697cf4f3229ddcb2e307bffa871c16 100644 (file)
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -3580,26 +3580,59 @@ static int __init io_apic_get_unique_id(int ioapic, int apic_id)
        return apic_id;
 }
 
-static u8 __init io_apic_unique_id(u8 id)
+static u8 __init io_apic_unique_id(int idx, u8 id)
 {
        if ((boot_cpu_data.x86_vendor == X86_VENDOR_INTEL) &&
            !APIC_XAPIC(apic_version[boot_cpu_physical_apicid]))
-               return io_apic_get_unique_id(nr_ioapics, id);
+               return io_apic_get_unique_id(idx, id);
        else
                return id;
 }
 #else
-static u8 __init io_apic_unique_id(u8 id)
+static u8 __init io_apic_unique_id(int idx, u8 id)
 {
-       int i;
+       union IO_APIC_reg_00 reg_00;
        DECLARE_BITMAP(used, 256);
+       unsigned long flags;
+       u8 new_id;
+       int i;
 
        bitmap_zero(used, 256);
        for_each_ioapic(i)
                __set_bit(mpc_ioapic_id(i), used);
+
+       /* Hand out the requested id if available */
        if (!test_bit(id, used))
                return id;
-       return find_first_zero_bit(used, 256);
+
+       /*
+        * Read the current id from the ioapic and keep it if
+        * available.
+        */
+       raw_spin_lock_irqsave(&ioapic_lock, flags);
+       reg_00.raw = io_apic_read(idx, 0);
+       raw_spin_unlock_irqrestore(&ioapic_lock, flags);
+       new_id = reg_00.bits.ID;
+       if (!test_bit(new_id, used)) {
+               apic_printk(APIC_VERBOSE, KERN_INFO
+                       "IOAPIC[%d]: Using reg apic_id %d instead of %d\n",
+                        idx, new_id, id);
+               return new_id;
+       }
+
+       /*
+        * Get the next free id and write it to the ioapic.
+        */
+       new_id = find_first_zero_bit(used, 256);
+       reg_00.bits.ID = new_id;
+       raw_spin_lock_irqsave(&ioapic_lock, flags);
+       io_apic_write(idx, 0, reg_00.raw);
+       reg_00.raw = io_apic_read(idx, 0);
+       raw_spin_unlock_irqrestore(&ioapic_lock, flags);
+       /* Sanity check */
+       BUG_ON(reg_00.bits.ID != new_id);
+
+       return new_id;
 }
 #endif
 
@@ -3865,7 +3898,7 @@ void __init mp_register_ioapic(int id, u32 address, u32 gsi_base,
                return;
        }
 
-       ioapics[idx].mp_config.apicid = io_apic_unique_id(id);
+       ioapics[idx].mp_config.apicid = io_apic_unique_id(idx, id);
        ioapics[idx].mp_config.apicver = io_apic_get_version(idx);
 
        /*