Joerg Roedel | 1c4248c | 2012-09-26 12:44:35 +0200 | [diff] [blame] | 1 | #include <linux/cpumask.h> |
Joerg Roedel | 736baef | 2012-03-30 11:47:00 -0700 | [diff] [blame] | 2 | #include <linux/kernel.h> |
| 3 | #include <linux/string.h> |
Joerg Roedel | 98f1ad2 | 2012-07-06 13:28:37 +0200 | [diff] [blame] | 4 | #include <linux/cpumask.h> |
Joerg Roedel | 736baef | 2012-03-30 11:47:00 -0700 | [diff] [blame] | 5 | #include <linux/errno.h> |
Joerg Roedel | 98f1ad2 | 2012-07-06 13:28:37 +0200 | [diff] [blame] | 6 | #include <linux/msi.h> |
Joerg Roedel | 5afba62 | 2012-09-26 12:44:38 +0200 | [diff] [blame] | 7 | #include <linux/irq.h> |
| 8 | #include <linux/pci.h> |
Joerg Roedel | 98f1ad2 | 2012-07-06 13:28:37 +0200 | [diff] [blame] | 9 | |
| 10 | #include <asm/hw_irq.h> |
| 11 | #include <asm/irq_remapping.h> |
Joerg Roedel | 1c4248c | 2012-09-26 12:44:35 +0200 | [diff] [blame] | 12 | #include <asm/processor.h> |
| 13 | #include <asm/x86_init.h> |
| 14 | #include <asm/apic.h> |
Joerg Roedel | 736baef | 2012-03-30 11:47:00 -0700 | [diff] [blame] | 15 | |
Suresh Siddha | 8a8f422 | 2012-03-30 11:47:08 -0700 | [diff] [blame] | 16 | #include "irq_remapping.h" |
Joerg Roedel | 736baef | 2012-03-30 11:47:00 -0700 | [diff] [blame] | 17 | |
Suresh Siddha | 95a02e9 | 2012-03-30 11:47:07 -0700 | [diff] [blame] | 18 | int irq_remapping_enabled; |
Joerg Roedel | 736baef | 2012-03-30 11:47:00 -0700 | [diff] [blame] | 19 | |
Suresh Siddha | 95a02e9 | 2012-03-30 11:47:07 -0700 | [diff] [blame] | 20 | int disable_irq_remap; |
Joerg Roedel | 736baef | 2012-03-30 11:47:00 -0700 | [diff] [blame] | 21 | int disable_sourceid_checking; |
| 22 | int no_x2apic_optout; |
| 23 | |
| 24 | static struct irq_remap_ops *remap_ops; |
| 25 | |
Joerg Roedel | 5afba62 | 2012-09-26 12:44:38 +0200 | [diff] [blame] | 26 | static int msi_alloc_remapped_irq(struct pci_dev *pdev, int irq, int nvec); |
| 27 | static int msi_setup_remapped_irq(struct pci_dev *pdev, unsigned int irq, |
| 28 | int index, int sub_handle); |
Joerg Roedel | 373dd7a | 2012-09-26 12:44:39 +0200 | [diff] [blame] | 29 | static int set_remapped_irq_affinity(struct irq_data *data, |
| 30 | const struct cpumask *mask, |
| 31 | bool force); |
Joerg Roedel | 5afba62 | 2012-09-26 12:44:38 +0200 | [diff] [blame] | 32 | |
Joerg Roedel | 1c4248c | 2012-09-26 12:44:35 +0200 | [diff] [blame] | 33 | static void irq_remapping_disable_io_apic(void) |
| 34 | { |
| 35 | /* |
| 36 | * With interrupt-remapping, for now we will use virtual wire A |
| 37 | * mode, as virtual wire B is little complex (need to configure |
| 38 | * both IOAPIC RTE as well as interrupt-remapping table entry). |
| 39 | * As this gets called during crash dump, keep this simple for |
| 40 | * now. |
| 41 | */ |
| 42 | if (cpu_has_apic || apic_from_smp_config()) |
| 43 | disconnect_bsp_APIC(0); |
| 44 | } |
| 45 | |
Joerg Roedel | 5afba62 | 2012-09-26 12:44:38 +0200 | [diff] [blame] | 46 | static int do_setup_msi_irqs(struct pci_dev *dev, int nvec) |
| 47 | { |
| 48 | int node, ret, sub_handle, index = 0; |
| 49 | unsigned int irq; |
| 50 | struct msi_desc *msidesc; |
| 51 | |
| 52 | nvec = __roundup_pow_of_two(nvec); |
| 53 | |
| 54 | WARN_ON(!list_is_singular(&dev->msi_list)); |
| 55 | msidesc = list_entry(dev->msi_list.next, struct msi_desc, list); |
| 56 | WARN_ON(msidesc->irq); |
| 57 | WARN_ON(msidesc->msi_attrib.multiple); |
| 58 | |
| 59 | node = dev_to_node(&dev->dev); |
| 60 | irq = __create_irqs(get_nr_irqs_gsi(), nvec, node); |
| 61 | if (irq == 0) |
| 62 | return -ENOSPC; |
| 63 | |
| 64 | msidesc->msi_attrib.multiple = ilog2(nvec); |
| 65 | for (sub_handle = 0; sub_handle < nvec; sub_handle++) { |
| 66 | if (!sub_handle) { |
| 67 | index = msi_alloc_remapped_irq(dev, irq, nvec); |
| 68 | if (index < 0) { |
| 69 | ret = index; |
| 70 | goto error; |
| 71 | } |
| 72 | } else { |
| 73 | ret = msi_setup_remapped_irq(dev, irq + sub_handle, |
| 74 | index, sub_handle); |
| 75 | if (ret < 0) |
| 76 | goto error; |
| 77 | } |
| 78 | ret = setup_msi_irq(dev, msidesc, irq, sub_handle); |
| 79 | if (ret < 0) |
| 80 | goto error; |
| 81 | } |
| 82 | return 0; |
| 83 | |
| 84 | error: |
| 85 | destroy_irqs(irq, nvec); |
| 86 | |
| 87 | /* |
| 88 | * Restore altered MSI descriptor fields and prevent just destroyed |
| 89 | * IRQs from tearing down again in default_teardown_msi_irqs() |
| 90 | */ |
| 91 | msidesc->irq = 0; |
| 92 | msidesc->msi_attrib.multiple = 0; |
| 93 | |
| 94 | return ret; |
| 95 | } |
| 96 | |
| 97 | static int do_setup_msix_irqs(struct pci_dev *dev, int nvec) |
| 98 | { |
| 99 | int node, ret, sub_handle, index = 0; |
| 100 | struct msi_desc *msidesc; |
| 101 | unsigned int irq; |
| 102 | |
| 103 | node = dev_to_node(&dev->dev); |
| 104 | irq = get_nr_irqs_gsi(); |
| 105 | sub_handle = 0; |
| 106 | |
| 107 | list_for_each_entry(msidesc, &dev->msi_list, list) { |
| 108 | |
| 109 | irq = create_irq_nr(irq, node); |
| 110 | if (irq == 0) |
| 111 | return -1; |
| 112 | |
| 113 | if (sub_handle == 0) |
| 114 | ret = index = msi_alloc_remapped_irq(dev, irq, nvec); |
| 115 | else |
| 116 | ret = msi_setup_remapped_irq(dev, irq, index, sub_handle); |
| 117 | |
| 118 | if (ret < 0) |
| 119 | goto error; |
| 120 | |
| 121 | ret = setup_msi_irq(dev, msidesc, irq, 0); |
| 122 | if (ret < 0) |
| 123 | goto error; |
| 124 | |
| 125 | sub_handle += 1; |
| 126 | irq += 1; |
| 127 | } |
| 128 | |
| 129 | return 0; |
| 130 | |
| 131 | error: |
| 132 | destroy_irq(irq); |
| 133 | return ret; |
| 134 | } |
| 135 | |
| 136 | static int irq_remapping_setup_msi_irqs(struct pci_dev *dev, |
| 137 | int nvec, int type) |
| 138 | { |
| 139 | if (type == PCI_CAP_ID_MSI) |
| 140 | return do_setup_msi_irqs(dev, nvec); |
| 141 | else |
| 142 | return do_setup_msix_irqs(dev, nvec); |
| 143 | } |
| 144 | |
Joerg Roedel | 1c4248c | 2012-09-26 12:44:35 +0200 | [diff] [blame] | 145 | static void __init irq_remapping_modify_x86_ops(void) |
| 146 | { |
Joerg Roedel | 71054d8 | 2012-09-26 12:44:37 +0200 | [diff] [blame] | 147 | x86_io_apic_ops.disable = irq_remapping_disable_io_apic; |
Joerg Roedel | 373dd7a | 2012-09-26 12:44:39 +0200 | [diff] [blame] | 148 | x86_io_apic_ops.set_affinity = set_remapped_irq_affinity; |
Joerg Roedel | a6a25dd | 2012-09-26 12:44:40 +0200 | [diff] [blame] | 149 | x86_io_apic_ops.setup_entry = setup_ioapic_remapped_entry; |
Joerg Roedel | 5afba62 | 2012-09-26 12:44:38 +0200 | [diff] [blame] | 150 | x86_msi.setup_msi_irqs = irq_remapping_setup_msi_irqs; |
Joerg Roedel | 71054d8 | 2012-09-26 12:44:37 +0200 | [diff] [blame] | 151 | x86_msi.setup_hpet_msi = setup_hpet_msi_remapped; |
Joerg Roedel | 1c4248c | 2012-09-26 12:44:35 +0200 | [diff] [blame] | 152 | } |
| 153 | |
Joerg Roedel | 736baef | 2012-03-30 11:47:00 -0700 | [diff] [blame] | 154 | static __init int setup_nointremap(char *str) |
| 155 | { |
Suresh Siddha | 95a02e9 | 2012-03-30 11:47:07 -0700 | [diff] [blame] | 156 | disable_irq_remap = 1; |
Joerg Roedel | 736baef | 2012-03-30 11:47:00 -0700 | [diff] [blame] | 157 | return 0; |
| 158 | } |
| 159 | early_param("nointremap", setup_nointremap); |
| 160 | |
Suresh Siddha | 95a02e9 | 2012-03-30 11:47:07 -0700 | [diff] [blame] | 161 | static __init int setup_irqremap(char *str) |
Joerg Roedel | 736baef | 2012-03-30 11:47:00 -0700 | [diff] [blame] | 162 | { |
| 163 | if (!str) |
| 164 | return -EINVAL; |
| 165 | |
| 166 | while (*str) { |
| 167 | if (!strncmp(str, "on", 2)) |
Suresh Siddha | 95a02e9 | 2012-03-30 11:47:07 -0700 | [diff] [blame] | 168 | disable_irq_remap = 0; |
Joerg Roedel | 736baef | 2012-03-30 11:47:00 -0700 | [diff] [blame] | 169 | else if (!strncmp(str, "off", 3)) |
Suresh Siddha | 95a02e9 | 2012-03-30 11:47:07 -0700 | [diff] [blame] | 170 | disable_irq_remap = 1; |
Joerg Roedel | 736baef | 2012-03-30 11:47:00 -0700 | [diff] [blame] | 171 | else if (!strncmp(str, "nosid", 5)) |
| 172 | disable_sourceid_checking = 1; |
| 173 | else if (!strncmp(str, "no_x2apic_optout", 16)) |
| 174 | no_x2apic_optout = 1; |
| 175 | |
| 176 | str += strcspn(str, ","); |
| 177 | while (*str == ',') |
| 178 | str++; |
| 179 | } |
| 180 | |
| 181 | return 0; |
| 182 | } |
Suresh Siddha | 95a02e9 | 2012-03-30 11:47:07 -0700 | [diff] [blame] | 183 | early_param("intremap", setup_irqremap); |
Joerg Roedel | 736baef | 2012-03-30 11:47:00 -0700 | [diff] [blame] | 184 | |
Suresh Siddha | 95a02e9 | 2012-03-30 11:47:07 -0700 | [diff] [blame] | 185 | void __init setup_irq_remapping_ops(void) |
Joerg Roedel | 736baef | 2012-03-30 11:47:00 -0700 | [diff] [blame] | 186 | { |
| 187 | remap_ops = &intel_irq_remap_ops; |
Joerg Roedel | c18d238 | 2012-06-26 16:59:34 +0200 | [diff] [blame] | 188 | |
| 189 | #ifdef CONFIG_AMD_IOMMU |
| 190 | if (amd_iommu_irq_ops.prepare() == 0) |
| 191 | remap_ops = &amd_iommu_irq_ops; |
| 192 | #endif |
Joerg Roedel | 736baef | 2012-03-30 11:47:00 -0700 | [diff] [blame] | 193 | } |
| 194 | |
Suresh Siddha | 95a02e9 | 2012-03-30 11:47:07 -0700 | [diff] [blame] | 195 | int irq_remapping_supported(void) |
Joerg Roedel | 736baef | 2012-03-30 11:47:00 -0700 | [diff] [blame] | 196 | { |
Suresh Siddha | 95a02e9 | 2012-03-30 11:47:07 -0700 | [diff] [blame] | 197 | if (disable_irq_remap) |
Joerg Roedel | 736baef | 2012-03-30 11:47:00 -0700 | [diff] [blame] | 198 | return 0; |
| 199 | |
| 200 | if (!remap_ops || !remap_ops->supported) |
| 201 | return 0; |
| 202 | |
| 203 | return remap_ops->supported(); |
| 204 | } |
| 205 | |
Suresh Siddha | 95a02e9 | 2012-03-30 11:47:07 -0700 | [diff] [blame] | 206 | int __init irq_remapping_prepare(void) |
Joerg Roedel | 736baef | 2012-03-30 11:47:00 -0700 | [diff] [blame] | 207 | { |
Suresh Siddha | 95a02e9 | 2012-03-30 11:47:07 -0700 | [diff] [blame] | 208 | if (!remap_ops || !remap_ops->prepare) |
Joerg Roedel | 736baef | 2012-03-30 11:47:00 -0700 | [diff] [blame] | 209 | return -ENODEV; |
| 210 | |
Suresh Siddha | 95a02e9 | 2012-03-30 11:47:07 -0700 | [diff] [blame] | 211 | return remap_ops->prepare(); |
Joerg Roedel | 736baef | 2012-03-30 11:47:00 -0700 | [diff] [blame] | 212 | } |
| 213 | |
Suresh Siddha | 95a02e9 | 2012-03-30 11:47:07 -0700 | [diff] [blame] | 214 | int __init irq_remapping_enable(void) |
Joerg Roedel | 736baef | 2012-03-30 11:47:00 -0700 | [diff] [blame] | 215 | { |
Joerg Roedel | 1c4248c | 2012-09-26 12:44:35 +0200 | [diff] [blame] | 216 | int ret; |
| 217 | |
Suresh Siddha | 95a02e9 | 2012-03-30 11:47:07 -0700 | [diff] [blame] | 218 | if (!remap_ops || !remap_ops->enable) |
Joerg Roedel | 736baef | 2012-03-30 11:47:00 -0700 | [diff] [blame] | 219 | return -ENODEV; |
| 220 | |
Joerg Roedel | 1c4248c | 2012-09-26 12:44:35 +0200 | [diff] [blame] | 221 | ret = remap_ops->enable(); |
| 222 | |
| 223 | if (irq_remapping_enabled) |
| 224 | irq_remapping_modify_x86_ops(); |
| 225 | |
| 226 | return ret; |
Joerg Roedel | 736baef | 2012-03-30 11:47:00 -0700 | [diff] [blame] | 227 | } |
Joerg Roedel | 4f3d8b6 | 2012-03-30 11:47:01 -0700 | [diff] [blame] | 228 | |
Suresh Siddha | 95a02e9 | 2012-03-30 11:47:07 -0700 | [diff] [blame] | 229 | void irq_remapping_disable(void) |
Joerg Roedel | 4f3d8b6 | 2012-03-30 11:47:01 -0700 | [diff] [blame] | 230 | { |
Joerg Roedel | 70733e0 | 2012-09-26 12:44:33 +0200 | [diff] [blame] | 231 | if (!irq_remapping_enabled || |
| 232 | !remap_ops || |
| 233 | !remap_ops->disable) |
Joerg Roedel | 4f3d8b6 | 2012-03-30 11:47:01 -0700 | [diff] [blame] | 234 | return; |
| 235 | |
Suresh Siddha | 95a02e9 | 2012-03-30 11:47:07 -0700 | [diff] [blame] | 236 | remap_ops->disable(); |
Joerg Roedel | 4f3d8b6 | 2012-03-30 11:47:01 -0700 | [diff] [blame] | 237 | } |
| 238 | |
Suresh Siddha | 95a02e9 | 2012-03-30 11:47:07 -0700 | [diff] [blame] | 239 | int irq_remapping_reenable(int mode) |
Joerg Roedel | 4f3d8b6 | 2012-03-30 11:47:01 -0700 | [diff] [blame] | 240 | { |
Joerg Roedel | 70733e0 | 2012-09-26 12:44:33 +0200 | [diff] [blame] | 241 | if (!irq_remapping_enabled || |
| 242 | !remap_ops || |
| 243 | !remap_ops->reenable) |
Joerg Roedel | 4f3d8b6 | 2012-03-30 11:47:01 -0700 | [diff] [blame] | 244 | return 0; |
| 245 | |
Suresh Siddha | 95a02e9 | 2012-03-30 11:47:07 -0700 | [diff] [blame] | 246 | return remap_ops->reenable(mode); |
Joerg Roedel | 4f3d8b6 | 2012-03-30 11:47:01 -0700 | [diff] [blame] | 247 | } |
| 248 | |
Suresh Siddha | 95a02e9 | 2012-03-30 11:47:07 -0700 | [diff] [blame] | 249 | int __init irq_remap_enable_fault_handling(void) |
Joerg Roedel | 4f3d8b6 | 2012-03-30 11:47:01 -0700 | [diff] [blame] | 250 | { |
Joerg Roedel | 70733e0 | 2012-09-26 12:44:33 +0200 | [diff] [blame] | 251 | if (!irq_remapping_enabled) |
| 252 | return 0; |
| 253 | |
Joerg Roedel | 4f3d8b6 | 2012-03-30 11:47:01 -0700 | [diff] [blame] | 254 | if (!remap_ops || !remap_ops->enable_faulting) |
| 255 | return -ENODEV; |
| 256 | |
| 257 | return remap_ops->enable_faulting(); |
| 258 | } |
Joerg Roedel | 0c3f173 | 2012-03-30 11:47:02 -0700 | [diff] [blame] | 259 | |
Suresh Siddha | 95a02e9 | 2012-03-30 11:47:07 -0700 | [diff] [blame] | 260 | int setup_ioapic_remapped_entry(int irq, |
| 261 | struct IO_APIC_route_entry *entry, |
| 262 | unsigned int destination, int vector, |
| 263 | struct io_apic_irq_attr *attr) |
Joerg Roedel | 0c3f173 | 2012-03-30 11:47:02 -0700 | [diff] [blame] | 264 | { |
| 265 | if (!remap_ops || !remap_ops->setup_ioapic_entry) |
| 266 | return -ENODEV; |
| 267 | |
| 268 | return remap_ops->setup_ioapic_entry(irq, entry, destination, |
| 269 | vector, attr); |
| 270 | } |
Joerg Roedel | 4c1bad6 | 2012-03-30 11:47:03 -0700 | [diff] [blame] | 271 | |
Suresh Siddha | 95a02e9 | 2012-03-30 11:47:07 -0700 | [diff] [blame] | 272 | int set_remapped_irq_affinity(struct irq_data *data, const struct cpumask *mask, |
| 273 | bool force) |
Joerg Roedel | 4c1bad6 | 2012-03-30 11:47:03 -0700 | [diff] [blame] | 274 | { |
Suresh Siddha | 7eb9ae0 | 2012-06-14 18:28:49 -0700 | [diff] [blame] | 275 | if (!config_enabled(CONFIG_SMP) || !remap_ops || |
| 276 | !remap_ops->set_affinity) |
Joerg Roedel | 4c1bad6 | 2012-03-30 11:47:03 -0700 | [diff] [blame] | 277 | return 0; |
| 278 | |
| 279 | return remap_ops->set_affinity(data, mask, force); |
| 280 | } |
Joerg Roedel | 9d619f6 | 2012-03-30 11:47:04 -0700 | [diff] [blame] | 281 | |
Suresh Siddha | 95a02e9 | 2012-03-30 11:47:07 -0700 | [diff] [blame] | 282 | void free_remapped_irq(int irq) |
Joerg Roedel | 9d619f6 | 2012-03-30 11:47:04 -0700 | [diff] [blame] | 283 | { |
| 284 | if (!remap_ops || !remap_ops->free_irq) |
| 285 | return; |
| 286 | |
| 287 | remap_ops->free_irq(irq); |
| 288 | } |
Joerg Roedel | 5e2b930 | 2012-03-30 11:47:05 -0700 | [diff] [blame] | 289 | |
Suresh Siddha | 95a02e9 | 2012-03-30 11:47:07 -0700 | [diff] [blame] | 290 | void compose_remapped_msi_msg(struct pci_dev *pdev, |
| 291 | unsigned int irq, unsigned int dest, |
| 292 | struct msi_msg *msg, u8 hpet_id) |
Joerg Roedel | 5e2b930 | 2012-03-30 11:47:05 -0700 | [diff] [blame] | 293 | { |
| 294 | if (!remap_ops || !remap_ops->compose_msi_msg) |
| 295 | return; |
| 296 | |
| 297 | remap_ops->compose_msi_msg(pdev, irq, dest, msg, hpet_id); |
| 298 | } |
| 299 | |
Joerg Roedel | 5afba62 | 2012-09-26 12:44:38 +0200 | [diff] [blame] | 300 | static int msi_alloc_remapped_irq(struct pci_dev *pdev, int irq, int nvec) |
Joerg Roedel | 5e2b930 | 2012-03-30 11:47:05 -0700 | [diff] [blame] | 301 | { |
| 302 | if (!remap_ops || !remap_ops->msi_alloc_irq) |
| 303 | return -ENODEV; |
| 304 | |
| 305 | return remap_ops->msi_alloc_irq(pdev, irq, nvec); |
| 306 | } |
| 307 | |
Joerg Roedel | 5afba62 | 2012-09-26 12:44:38 +0200 | [diff] [blame] | 308 | static int msi_setup_remapped_irq(struct pci_dev *pdev, unsigned int irq, |
| 309 | int index, int sub_handle) |
Joerg Roedel | 5e2b930 | 2012-03-30 11:47:05 -0700 | [diff] [blame] | 310 | { |
| 311 | if (!remap_ops || !remap_ops->msi_setup_irq) |
| 312 | return -ENODEV; |
| 313 | |
| 314 | return remap_ops->msi_setup_irq(pdev, irq, index, sub_handle); |
| 315 | } |
| 316 | |
Suresh Siddha | 95a02e9 | 2012-03-30 11:47:07 -0700 | [diff] [blame] | 317 | int setup_hpet_msi_remapped(unsigned int irq, unsigned int id) |
Joerg Roedel | 5e2b930 | 2012-03-30 11:47:05 -0700 | [diff] [blame] | 318 | { |
| 319 | if (!remap_ops || !remap_ops->setup_hpet_msi) |
| 320 | return -ENODEV; |
| 321 | |
| 322 | return remap_ops->setup_hpet_msi(irq, id); |
| 323 | } |
Joerg Roedel | 6a9f5de | 2012-09-26 12:44:41 +0200 | [diff] [blame] | 324 | |
| 325 | void panic_if_irq_remap(const char *msg) |
| 326 | { |
| 327 | if (irq_remapping_enabled) |
| 328 | panic(msg); |
| 329 | } |