drivers/pci/msi-apic.c

   1 /*
   2  * MSI hooks for standard x86 apic
   3  */
   4
   5 #include <linux/pci.h>
   6 #include <linux/irq.h>
   7 #include <asm/smp.h>
   8
   9 #include "msi.h"
  10
  11 /*
  12  * Shifts for APIC-based data
  13  */
  14
  15 #define MSI_DATA_VECTOR_SHIFT           0
  16 #define     MSI_DATA_VECTOR(v)          (((u8)v) << MSI_DATA_VECTOR_SHIFT)
  17
  18 #define MSI_DATA_DELIVERY_SHIFT         8
  19 #define     MSI_DATA_DELIVERY_FIXED     (0 << MSI_DATA_DELIVERY_SHIFT)
  20 #define     MSI_DATA_DELIVERY_LOWPRI    (1 << MSI_DATA_DELIVERY_SHIFT)
  21
  22 #define MSI_DATA_LEVEL_SHIFT            14
  23 #define     MSI_DATA_LEVEL_DEASSERT     (0 << MSI_DATA_LEVEL_SHIFT)
  24 #define     MSI_DATA_LEVEL_ASSERT       (1 << MSI_DATA_LEVEL_SHIFT)
  25
  26 #define MSI_DATA_TRIGGER_SHIFT          15
  27 #define     MSI_DATA_TRIGGER_EDGE       (0 << MSI_DATA_TRIGGER_SHIFT)
  28 #define     MSI_DATA_TRIGGER_LEVEL      (1 << MSI_DATA_TRIGGER_SHIFT)
  29
  30 /*
  31  * Shift/mask fields for APIC-based bus address
  32  */
  33
  34 #define MSI_ADDR_HEADER                 0xfee00000
  35
  36 #define MSI_ADDR_DESTID_MASK            0xfff0000f
  37 #define     MSI_ADDR_DESTID_CPU(cpu)    ((cpu) << MSI_TARGET_CPU_SHIFT)
  38
  39 #define MSI_ADDR_DESTMODE_SHIFT         2
  40 #define     MSI_ADDR_DESTMODE_PHYS      (0 << MSI_ADDR_DESTMODE_SHIFT)
  41 #define     MSI_ADDR_DESTMODE_LOGIC     (1 << MSI_ADDR_DESTMODE_SHIFT)
  42
  43 #define MSI_ADDR_REDIRECTION_SHIFT      3
  44 #define     MSI_ADDR_REDIRECTION_CPU    (0 << MSI_ADDR_REDIRECTION_SHIFT)
  45 #define     MSI_ADDR_REDIRECTION_LOWPRI (1 << MSI_ADDR_REDIRECTION_SHIFT)
  46
  47
  48 static void
  49 msi_target_apic(unsigned int vector,
  50                 unsigned int dest_cpu,
  51                 u32 *address_hi,        /* in/out */
  52                 u32 *address_lo)        /* in/out */
  53 {
  54         u32 addr = *address_lo;
  55
  56         addr &= MSI_ADDR_DESTID_MASK;
  57         addr |= MSI_ADDR_DESTID_CPU(cpu_physical_id(dest_cpu));
  58
  59         *address_lo = addr;
  60 }
  61
  62 static int
  63 msi_setup_apic(struct pci_dev *pdev,    /* unused in generic */
  64                 unsigned int vector,
  65                 u32 *address_hi,
  66                 u32 *address_lo,
  67                 u32 *data)
  68 {
  69         unsigned long   dest_phys_id;
  70
  71         dest_phys_id = cpu_physical_id(first_cpu(cpu_online_map));
  72
  73         *address_hi = 0;
  74         *address_lo =   MSI_ADDR_HEADER |
  75                         MSI_ADDR_DESTMODE_PHYS |
  76                         MSI_ADDR_REDIRECTION_CPU |
  77                         MSI_ADDR_DESTID_CPU(dest_phys_id);
  78
  79         *data = MSI_DATA_TRIGGER_EDGE |
  80                 MSI_DATA_LEVEL_ASSERT |
  81                 MSI_DATA_DELIVERY_FIXED |
  82                 MSI_DATA_VECTOR(vector);
  83
  84         return 0;
  85 }
  86
  87 static void
  88 msi_teardown_apic(unsigned int vector)
  89 {
  90         return;         /* no-op */
  91 }
  92
  93 /*
  94  * Generic ops used on most IA archs/platforms.  Set with msi_register()
  95  */
  96
  97 struct msi_ops msi_apic_ops = {
  98         .setup = msi_setup_apic,
  99         .teardown = msi_teardown_apic,
 100         .target = msi_target_apic,
 101 };