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(struct irq_data *idata,
  16                                      const cpumask_t *cpu_mask, bool force)
  17 {
  18         struct msi_msg msg;
  19         u32 addr, data;
  20         int cpu = cpumask_first_and(cpu_mask, cpu_online_mask);
  21         unsigned int irq = idata->irq;
  22
  23         if (irq_prepare_move(irq, cpu))
  24                 return -1;
  25
  26         get_cached_msi_msg(irq, &msg);
  27
  28         addr = msg.address_lo;
  29         addr &= MSI_ADDR_DEST_ID_MASK;
  30         addr |= MSI_ADDR_DEST_ID_CPU(cpu_physical_id(cpu));
  31         msg.address_lo = addr;
  32
  33         data = msg.data;
  34         data &= MSI_DATA_VECTOR_MASK;
  35         data |= MSI_DATA_VECTOR(irq_to_vector(irq));
  36         msg.data = data;
  37
  38         write_msi_msg(irq, &msg);
  39         cpumask_copy(idata->affinity, cpumask_of(cpu));
  40
  41         return 0;
  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         irq_set_msi_desc(irq, desc);
  57         cpumask_and(&mask, &(irq_to_domain(irq)), cpu_online_mask);
  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         irq_set_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(struct irq_data *data)
  86 {
  87         irq_complete_move(data->irq);
  88         irq_move_irq(data);
  89         ia64_eoi();
  90 }
  91
  92 static int ia64_msi_retrigger_irq(struct irq_data *data)
  93 {
  94         unsigned int vector = irq_to_vector(data->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         .irq_mask               = mask_msi_irq,
 106         .irq_unmask             = unmask_msi_irq,
 107         .irq_ack                = ia64_ack_msi_irq,
 108 #ifdef CONFIG_SMP
 109         .irq_set_affinity       = ia64_set_msi_irq_affinity,
 110 #endif
 111         .irq_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_INTEL_IOMMU
 132 #ifdef CONFIG_SMP
 133 static int dmar_msi_set_affinity(struct irq_data *data,
 134                                  const struct cpumask *mask, bool force)
 135 {
 136         unsigned int irq = data->irq;
 137         struct irq_cfg *cfg = irq_cfg + irq;
 138         struct msi_msg msg;
 139         int cpu = cpumask_first_and(mask, cpu_online_mask);
 140
 141         if (irq_prepare_move(irq, cpu))
 142                 return -1;
 143
 144         dmar_msi_read(irq, &msg);
 145
 146         msg.data &= ~MSI_DATA_VECTOR_MASK;
 147         msg.data |= MSI_DATA_VECTOR(cfg->vector);
 148         msg.address_lo &= ~MSI_ADDR_DEST_ID_MASK;
 149         msg.address_lo |= MSI_ADDR_DEST_ID_CPU(cpu_physical_id(cpu));
 150
 151         dmar_msi_write(irq, &msg);
 152         cpumask_copy(data->affinity, mask);
 153
 154         return 0;
 155 }
 156 #endif /* CONFIG_SMP */
 157
 158 static struct irq_chip dmar_msi_type = {
 159         .name = "DMAR_MSI",
 160         .irq_unmask = dmar_msi_unmask,
 161         .irq_mask = dmar_msi_mask,
 162         .irq_ack = ia64_ack_msi_irq,
 163 #ifdef CONFIG_SMP
 164         .irq_set_affinity = dmar_msi_set_affinity,
 165 #endif
 166         .irq_retrigger = ia64_msi_retrigger_irq,
 167 };
 168
 169 static int
 170 msi_compose_msg(struct pci_dev *pdev, unsigned int irq, struct msi_msg *msg)
 171 {
 172         struct irq_cfg *cfg = irq_cfg + irq;
 173         unsigned dest;
 174         cpumask_t mask;
 175
 176         cpumask_and(&mask, &(irq_to_domain(irq)), cpu_online_mask);
 177         dest = cpu_physical_id(first_cpu(mask));
 178
 179         msg->address_hi = 0;
 180         msg->address_lo =
 181                 MSI_ADDR_HEADER |
 182                 MSI_ADDR_DEST_MODE_PHYS |
 183                 MSI_ADDR_REDIRECTION_CPU |
 184                 MSI_ADDR_DEST_ID_CPU(dest);
 185
 186         msg->data =
 187                 MSI_DATA_TRIGGER_EDGE |
 188                 MSI_DATA_LEVEL_ASSERT |
 189                 MSI_DATA_DELIVERY_FIXED |
 190                 MSI_DATA_VECTOR(cfg->vector);
 191         return 0;
 192 }
 193
 194 int arch_setup_dmar_msi(unsigned int irq)
 195 {
 196         int ret;
 197         struct msi_msg msg;
 198
 199         ret = msi_compose_msg(NULL, irq, &msg);
 200         if (ret < 0)
 201                 return ret;
 202         dmar_msi_write(irq, &msg);
 203         irq_set_chip_and_handler_name(irq, &dmar_msi_type, handle_edge_irq,
 204                                       "edge");
 205         return 0;
 206 }
 207 #endif /* CONFIG_INTEL_IOMMU */
 208