put the port name in the interrupt handler name.  this way we can
see the interrupt activity per port

since the time is assigned to the first handler, you can see that
interrupts are happening before all the handlers are installed
in the example below

comer# grep uartox958 /dev/irqalloc
       68.0          11                   73              6001992 ioapic   uartox958.1.0.0 prt 15
       68.0          11                    2               192330 ioapic   uartox958.1.0.0 prt 14
       68.0          11                    3               240048 ioapic   uartox958.1.0.0 prt 13
       68.0          11                    2               166392 ioapic   uartox958.1.0.0 prt 12
       68.0          11                    6               366687 ioapic   uartox958.1.0.0 prt 11
       68.0          11                    2               142083 ioapic   uartox958.1.0.0 prt 10
       68.0          11                    3               185112 ioapic   uartox958.1.0.0 prt 9
       68.0          11                    3               163674 ioapic   uartox958.1.0.0 prt 8
       68.0          11                    7               278307 ioapic   uartox958.1.0.0 prt 7
       68.0          11                    1                37908 ioapic   uartox958.1.0.0 prt 6
       68.0          11                    1                34137 ioapic   uartox958.1.0.0 prt 5
       68.0          11                    1                25848 ioapic   uartox958.1.0.0 prt 4
       68.0          11                    1                24480 ioapic   uartox958.1.0.0 prt 3
       68.0          11                    1                18675 ioapic   uartox958.1.0.0 prt 2
       68.0          11                    1                15354 ioapic   uartox958.1.0.0 prt 1
       68.0          11                    1                 8010 ioapic   uartox958.1.0.0 prt 0

Reference: /n/atom/patch/applied/uartoxprt
Date: Tue Jan  7 17:27:05 CET 2014
Signed-off-by: quanstro@quanstro.net

--- /sys/src/nix/k10/uartox958.c	Tue Jan  7 17:22:09 2014
+++ /sys/src/nix/k10/uartox958.c	Tue Jan  7 17:22:09 2014
@@ -10,6 +10,7 @@
 #include "../port/error.h"
 #include "../port/uartp8250.h"
 
+/* need a way to chain these on the irq */
 extern PhysUart ox958physuart;
 
 static uint
@@ -104,7 +105,7 @@
 			}
 			uart->regs = ctlr;
 
-			snprint(buf, sizeof buf, "%s.%.8ux", "OXPCIe958", p->tbdf);
+			snprint(buf, sizeof buf, "uartox958.%T prt %d", p->tbdf, i);
 			kstrdup(&uart->name, buf);
 			uart->freq = 62284801;
 			uart->phys = &ox958physuart;