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Linux/arch/ia64/kernel/msi_ia64.c

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  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 = first_cpu(*cpu_mask);
 21         unsigned int irq = idata->irq;
 22 
 23         if (!cpu_online(cpu))
 24                 return -1;
 25 
 26         if (irq_prepare_move(irq, cpu))
 27                 return -1;
 28 
 29         get_cached_msi_msg(irq, &msg);
 30 
 31         addr = msg.address_lo;
 32         addr &= MSI_ADDR_DEST_ID_MASK;
 33         addr |= MSI_ADDR_DEST_ID_CPU(cpu_physical_id(cpu));
 34         msg.address_lo = addr;
 35 
 36         data = msg.data;
 37         data &= MSI_DATA_VECTOR_MASK;
 38         data |= MSI_DATA_VECTOR(irq_to_vector(irq));
 39         msg.data = data;
 40 
 41         write_msi_msg(irq, &msg);
 42         cpumask_copy(idata->affinity, cpumask_of(cpu));
 43 
 44         return 0;
 45 }
 46 #endif /* CONFIG_SMP */
 47 
 48 int ia64_setup_msi_irq(struct pci_dev *pdev, struct msi_desc *desc)
 49 {
 50         struct msi_msg  msg;
 51         unsigned long   dest_phys_id;
 52         int     irq, vector;
 53         cpumask_t mask;
 54 
 55         irq = create_irq();
 56         if (irq < 0)
 57                 return irq;
 58 
 59         irq_set_msi_desc(irq, desc);
 60         cpus_and(mask, irq_to_domain(irq), cpu_online_map);
 61         dest_phys_id = cpu_physical_id(first_cpu(mask));
 62         vector = irq_to_vector(irq);
 63 
 64         msg.address_hi = 0;
 65         msg.address_lo =
 66                 MSI_ADDR_HEADER |
 67                 MSI_ADDR_DEST_MODE_PHYS |
 68                 MSI_ADDR_REDIRECTION_CPU |
 69                 MSI_ADDR_DEST_ID_CPU(dest_phys_id);
 70 
 71         msg.data =
 72                 MSI_DATA_TRIGGER_EDGE |
 73                 MSI_DATA_LEVEL_ASSERT |
 74                 MSI_DATA_DELIVERY_FIXED |
 75                 MSI_DATA_VECTOR(vector);
 76 
 77         write_msi_msg(irq, &msg);
 78         irq_set_chip_and_handler(irq, &ia64_msi_chip, handle_edge_irq);
 79 
 80         return 0;
 81 }
 82 
 83 void ia64_teardown_msi_irq(unsigned int irq)
 84 {
 85         destroy_irq(irq);
 86 }
 87 
 88 static void ia64_ack_msi_irq(struct irq_data *data)
 89 {
 90         irq_complete_move(data->irq);
 91         irq_move_irq(data);
 92         ia64_eoi();
 93 }
 94 
 95 static int ia64_msi_retrigger_irq(struct irq_data *data)
 96 {
 97         unsigned int vector = irq_to_vector(data->irq);
 98         ia64_resend_irq(vector);
 99 
100         return 1;
101 }
102 
103 /*
104  * Generic ops used on most IA64 platforms.
105  */
106 static struct irq_chip ia64_msi_chip = {
107         .name                   = "PCI-MSI",
108         .irq_mask               = mask_msi_irq,
109         .irq_unmask             = unmask_msi_irq,
110         .irq_ack                = ia64_ack_msi_irq,
111 #ifdef CONFIG_SMP
112         .irq_set_affinity       = ia64_set_msi_irq_affinity,
113 #endif
114         .irq_retrigger          = ia64_msi_retrigger_irq,
115 };
116 
117 
118 int arch_setup_msi_irq(struct pci_dev *pdev, struct msi_desc *desc)
119 {
120         if (platform_setup_msi_irq)
121                 return platform_setup_msi_irq(pdev, desc);
122 
123         return ia64_setup_msi_irq(pdev, desc);
124 }
125 
126 void arch_teardown_msi_irq(unsigned int irq)
127 {
128         if (platform_teardown_msi_irq)
129                 return platform_teardown_msi_irq(irq);
130 
131         return ia64_teardown_msi_irq(irq);
132 }
133 
134 #ifdef CONFIG_DMAR
135 #ifdef CONFIG_SMP
136 static int dmar_msi_set_affinity(struct irq_data *data,
137                                  const struct cpumask *mask, bool force)
138 {
139         unsigned int irq = data->irq;
140         struct irq_cfg *cfg = irq_cfg + irq;
141         struct msi_msg msg;
142         int cpu = cpumask_first(mask);
143 
144         if (!cpu_online(cpu))
145                 return -1;
146 
147         if (irq_prepare_move(irq, cpu))
148                 return -1;
149 
150         dmar_msi_read(irq, &msg);
151 
152         msg.data &= ~MSI_DATA_VECTOR_MASK;
153         msg.data |= MSI_DATA_VECTOR(cfg->vector);
154         msg.address_lo &= ~MSI_ADDR_DEST_ID_MASK;
155         msg.address_lo |= MSI_ADDR_DEST_ID_CPU(cpu_physical_id(cpu));
156 
157         dmar_msi_write(irq, &msg);
158         cpumask_copy(data->affinity, mask);
159 
160         return 0;
161 }
162 #endif /* CONFIG_SMP */
163 
164 static struct irq_chip dmar_msi_type = {
165         .name = "DMAR_MSI",
166         .irq_unmask = dmar_msi_unmask,
167         .irq_mask = dmar_msi_mask,
168         .irq_ack = ia64_ack_msi_irq,
169 #ifdef CONFIG_SMP
170         .irq_set_affinity = dmar_msi_set_affinity,
171 #endif
172         .irq_retrigger = ia64_msi_retrigger_irq,
173 };
174 
175 static int
176 msi_compose_msg(struct pci_dev *pdev, unsigned int irq, struct msi_msg *msg)
177 {
178         struct irq_cfg *cfg = irq_cfg + irq;
179         unsigned dest;
180         cpumask_t mask;
181 
182         cpus_and(mask, irq_to_domain(irq), cpu_online_map);
183         dest = cpu_physical_id(first_cpu(mask));
184 
185         msg->address_hi = 0;
186         msg->address_lo =
187                 MSI_ADDR_HEADER |
188                 MSI_ADDR_DEST_MODE_PHYS |
189                 MSI_ADDR_REDIRECTION_CPU |
190                 MSI_ADDR_DEST_ID_CPU(dest);
191 
192         msg->data =
193                 MSI_DATA_TRIGGER_EDGE |
194                 MSI_DATA_LEVEL_ASSERT |
195                 MSI_DATA_DELIVERY_FIXED |
196                 MSI_DATA_VECTOR(cfg->vector);
197         return 0;
198 }
199 
200 int arch_setup_dmar_msi(unsigned int irq)
201 {
202         int ret;
203         struct msi_msg msg;
204 
205         ret = msi_compose_msg(NULL, irq, &msg);
206         if (ret < 0)
207                 return ret;
208         dmar_msi_write(irq, &msg);
209         irq_set_chip_and_handler_name(irq, &dmar_msi_type, handle_edge_irq,
210                                       "edge");
211         return 0;
212 }
213 #endif /* CONFIG_DMAR */
214 
215 

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