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