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