release/src-rt-6.x.4708/linux/linux-2.6.36/arch/ia64/kernel/msi_ia64.c

   1 /*
   2  * MSI hooks for standard x86 apic
   3  */
   4
   5 #include <linux/pci.h>
   6 #include <linux/irq.h>
   7 #include <linux/msi.h>
   8 #include <linux/dmar.h>
   9 #include <asm/smp.h>
  10 #include <asm/msidef.h>
  11
  12 static struct irq_chip  ia64_msi_chip;
  13
  14 #ifdef CONFIG_SMP
  15 static int ia64_set_msi_irq_affinity(unsigned int irq,
  16                                       const cpumask_t *cpu_mask)
  17 {
  18         struct msi_msg msg;
  19         u32 addr, data;
  20         int cpu = first_cpu(*cpu_mask);
  21
  22         if (!cpu_online(cpu))
  23                 return -1;
  24
  25         if (irq_prepare_move(irq, cpu))
  26                 return -1;
  27
  28         get_cached_msi_msg(irq, &msg);
  29
  30         addr = msg.address_lo;
  31         addr &= MSI_ADDR_DEST_ID_MASK;
  32         addr |= MSI_ADDR_DEST_ID_CPU(cpu_physical_id(cpu));
  33         msg.address_lo = addr;
  34
  35         data = msg.data;
  36         data &= MSI_DATA_VECTOR_MASK;
  37         data |= MSI_DATA_VECTOR(irq_to_vector(irq));
  38         msg.data = data;
  39
  40         write_msi_msg(irq, &msg);
  41         cpumask_copy(irq_desc[irq].affinity, cpumask_of(cpu));
  42
  43         return 0;
  44 }
  45 #endif /* CONFIG_SMP */
  46
  47 int ia64_setup_msi_irq(struct pci_dev *pdev, struct msi_desc *desc)
  48 {
  49         struct msi_msg  msg;
  50         unsigned long   dest_phys_id;
  51         int     irq, vector;
  52         cpumask_t mask;
  53
  54         irq = create_irq();
  55         if (irq < 0)
  56                 return irq;
  57
  58         set_irq_msi(irq, desc);
  59         cpus_and(mask, irq_to_domain(irq), cpu_online_map);
  60         dest_phys_id = cpu_physical_id(first_cpu(mask));
  61         vector = irq_to_vector(irq);
  62
  63         msg.address_hi = 0;
  64         msg.address_lo =
  65                 MSI_ADDR_HEADER |
  66                 MSI_ADDR_DEST_MODE_PHYS |
  67                 MSI_ADDR_REDIRECTION_CPU |
  68                 MSI_ADDR_DEST_ID_CPU(dest_phys_id);
  69
  70         msg.data =
  71                 MSI_DATA_TRIGGER_EDGE |
  72                 MSI_DATA_LEVEL_ASSERT |
  73                 MSI_DATA_DELIVERY_FIXED |
  74                 MSI_DATA_VECTOR(vector);
  75
  76         write_msi_msg(irq, &msg);
  77         set_irq_chip_and_handler(irq, &ia64_msi_chip, handle_edge_irq);
  78
  79         return 0;
  80 }
  81
  82 void ia64_teardown_msi_irq(unsigned int irq)
  83 {
  84         destroy_irq(irq);
  85 }
  86
  87 static void ia64_ack_msi_irq(unsigned int irq)
  88 {
  89         irq_complete_move(irq);
  90         move_native_irq(irq);
  91         ia64_eoi();
  92 }
  93
  94 static int ia64_msi_retrigger_irq(unsigned int irq)
  95 {
  96         unsigned int vector = irq_to_vector(irq);
  97         ia64_resend_irq(vector);
  98
  99         return 1;
 100 }
 101
 102 /*
 103  * Generic ops used on most IA64 platforms.
 104  */
 105 static struct irq_chip ia64_msi_chip = {
 106         .name           = "PCI-MSI",
 107         .mask           = mask_msi_irq,
 108         .unmask         = unmask_msi_irq,
 109         .ack            = ia64_ack_msi_irq,
 110 #ifdef CONFIG_SMP
 111         .set_affinity   = ia64_set_msi_irq_affinity,
 112 #endif
 113         .retrigger      = ia64_msi_retrigger_irq,
 114 };
 115
 116
 117 int arch_setup_msi_irq(struct pci_dev *pdev, struct msi_desc *desc)
 118 {
 119         if (platform_setup_msi_irq)
 120                 return platform_setup_msi_irq(pdev, desc);
 121
 122         return ia64_setup_msi_irq(pdev, desc);
 123 }
 124
 125 void arch_teardown_msi_irq(unsigned int irq)
 126 {
 127         if (platform_teardown_msi_irq)
 128                 return platform_teardown_msi_irq(irq);
 129
 130         return ia64_teardown_msi_irq(irq);
 131 }
 132
 133 #ifdef CONFIG_DMAR
 134 #ifdef CONFIG_SMP
 135 static int dmar_msi_set_affinity(unsigned int irq, const struct cpumask *mask)
 136 {
 137         struct irq_cfg *cfg = irq_cfg + irq;
 138         struct msi_msg msg;
 139         int cpu = cpumask_first(mask);
 140
 141         if (!cpu_online(cpu))
 142                 return -1;
 143
 144         if (irq_prepare_move(irq, cpu))
 145                 return -1;
 146
 147         dmar_msi_read(irq, &msg);
 148
 149         msg.data &= ~MSI_DATA_VECTOR_MASK;
 150         msg.data |= MSI_DATA_VECTOR(cfg->vector);
 151         msg.address_lo &= ~MSI_ADDR_DEST_ID_MASK;
 152         msg.address_lo |= MSI_ADDR_DEST_ID_CPU(cpu_physical_id(cpu));
 153
 154         dmar_msi_write(irq, &msg);
 155         cpumask_copy(irq_desc[irq].affinity, mask);
 156
 157         return 0;
 158 }
 159 #endif /* CONFIG_SMP */
 160
 161 static struct irq_chip dmar_msi_type = {
 162         .name = "DMAR_MSI",
 163         .unmask = dmar_msi_unmask,
 164         .mask = dmar_msi_mask,
 165         .ack = ia64_ack_msi_irq,
 166 #ifdef CONFIG_SMP
 167         .set_affinity = dmar_msi_set_affinity,
 168 #endif
 169         .retrigger = ia64_msi_retrigger_irq,
 170 };
 171
 172 static int
 173 msi_compose_msg(struct pci_dev *pdev, unsigned int irq, struct msi_msg *msg)
 174 {
 175         struct irq_cfg *cfg = irq_cfg + irq;
 176         unsigned dest;
 177         cpumask_t mask;
 178
 179         cpus_and(mask, irq_to_domain(irq), cpu_online_map);
 180         dest = cpu_physical_id(first_cpu(mask));
 181
 182         msg->address_hi = 0;
 183         msg->address_lo =
 184                 MSI_ADDR_HEADER |
 185                 MSI_ADDR_DEST_MODE_PHYS |
 186                 MSI_ADDR_REDIRECTION_CPU |
 187                 MSI_ADDR_DEST_ID_CPU(dest);
 188
 189         msg->data =
 190                 MSI_DATA_TRIGGER_EDGE |
 191                 MSI_DATA_LEVEL_ASSERT |
 192                 MSI_DATA_DELIVERY_FIXED |
 193                 MSI_DATA_VECTOR(cfg->vector);
 194         return 0;
 195 }
 196
 197 int arch_setup_dmar_msi(unsigned int irq)
 198 {
 199         int ret;
 200         struct msi_msg msg;
 201
 202         ret = msi_compose_msg(NULL, irq, &msg);
 203         if (ret < 0)
 204                 return ret;
 205         dmar_msi_write(irq, &msg);
 206         set_irq_chip_and_handler_name(irq, &dmar_msi_type, handle_edge_irq,
 207                 "edge");
 208         return 0;
 209 }
 210 #endif /* CONFIG_DMAR */