Alex Nixon | b5401a9 | 2010-03-18 16:31:34 -0400 | [diff] [blame] | 1 | /* |
Konrad Rzeszutek Wilk | 996c34a | 2011-06-06 12:22:23 -0400 | [diff] [blame] | 2 | * Xen PCI - handle PCI (INTx) and MSI infrastructure calls for PV, HVM and |
| 3 | * initial domain support. We also handle the DSDT _PRT callbacks for GSI's |
| 4 | * used in HVM and initial domain mode (PV does not parse ACPI, so it has no |
| 5 | * concept of GSIs). Under PV we hook under the pnbbios API for IRQs and |
| 6 | * 0xcf8 PCI configuration read/write. |
Alex Nixon | b5401a9 | 2010-03-18 16:31:34 -0400 | [diff] [blame] | 7 | * |
| 8 | * Author: Ryan Wilson <hap9@epoch.ncsc.mil> |
Konrad Rzeszutek Wilk | 996c34a | 2011-06-06 12:22:23 -0400 | [diff] [blame] | 9 | * Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> |
| 10 | * Stefano Stabellini <stefano.stabellini@eu.citrix.com> |
Alex Nixon | b5401a9 | 2010-03-18 16:31:34 -0400 | [diff] [blame] | 11 | */ |
| 12 | #include <linux/module.h> |
| 13 | #include <linux/init.h> |
| 14 | #include <linux/pci.h> |
| 15 | #include <linux/acpi.h> |
| 16 | |
| 17 | #include <linux/io.h> |
Stefano Stabellini | 0e058e5 | 2010-10-21 17:40:08 +0100 | [diff] [blame] | 18 | #include <asm/io_apic.h> |
Alex Nixon | b5401a9 | 2010-03-18 16:31:34 -0400 | [diff] [blame] | 19 | #include <asm/pci_x86.h> |
| 20 | |
| 21 | #include <asm/xen/hypervisor.h> |
| 22 | |
Stefano Stabellini | 3942b74 | 2010-06-24 17:50:18 +0100 | [diff] [blame] | 23 | #include <xen/features.h> |
Alex Nixon | b5401a9 | 2010-03-18 16:31:34 -0400 | [diff] [blame] | 24 | #include <xen/events.h> |
| 25 | #include <asm/xen/pci.h> |
| 26 | |
Konrad Rzeszutek Wilk | fef6e26 | 2011-07-06 10:16:21 -0400 | [diff] [blame] | 27 | static int xen_pcifront_enable_irq(struct pci_dev *dev) |
| 28 | { |
| 29 | int rc; |
| 30 | int share = 1; |
| 31 | int pirq; |
| 32 | u8 gsi; |
| 33 | |
| 34 | rc = pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &gsi); |
| 35 | if (rc < 0) { |
| 36 | dev_warn(&dev->dev, "Xen PCI: failed to read interrupt line: %d\n", |
| 37 | rc); |
| 38 | return rc; |
| 39 | } |
Konrad Rzeszutek Wilk | 78316ad | 2011-07-06 15:15:23 -0400 | [diff] [blame] | 40 | /* In PV DomU the Xen PCI backend puts the PIRQ in the interrupt line.*/ |
| 41 | pirq = gsi; |
Konrad Rzeszutek Wilk | fef6e26 | 2011-07-06 10:16:21 -0400 | [diff] [blame] | 42 | |
| 43 | if (gsi < NR_IRQS_LEGACY) |
| 44 | share = 0; |
| 45 | |
| 46 | rc = xen_bind_pirq_gsi_to_irq(gsi, pirq, share, "pcifront"); |
| 47 | if (rc < 0) { |
| 48 | dev_warn(&dev->dev, "Xen PCI: failed to bind GSI%d (PIRQ%d) to IRQ: %d\n", |
| 49 | gsi, pirq, rc); |
| 50 | return rc; |
| 51 | } |
| 52 | |
| 53 | dev->irq = rc; |
| 54 | dev_info(&dev->dev, "Xen PCI mapped GSI%d to IRQ%d\n", gsi, dev->irq); |
| 55 | return 0; |
| 56 | } |
| 57 | |
Stefano Stabellini | 42a1de5 | 2010-06-24 16:42:04 +0100 | [diff] [blame] | 58 | #ifdef CONFIG_ACPI |
Konrad Rzeszutek Wilk | ed89eb6 | 2011-07-06 12:42:43 -0400 | [diff] [blame] | 59 | static int xen_register_pirq(u32 gsi, int gsi_override, int triggering, |
Konrad Rzeszutek Wilk | 78316ad | 2011-07-06 15:15:23 -0400 | [diff] [blame] | 60 | bool set_pirq) |
Stefano Stabellini | 42a1de5 | 2010-06-24 16:42:04 +0100 | [diff] [blame] | 61 | { |
Konrad Rzeszutek Wilk | ed89eb6 | 2011-07-06 12:42:43 -0400 | [diff] [blame] | 62 | int rc, pirq = -1, irq = -1; |
Stefano Stabellini | 42a1de5 | 2010-06-24 16:42:04 +0100 | [diff] [blame] | 63 | struct physdev_map_pirq map_irq; |
| 64 | int shareable = 0; |
| 65 | char *name; |
| 66 | |
Stefano Stabellini | 68c2c39 | 2012-05-21 16:54:10 +0100 | [diff] [blame] | 67 | irq = xen_irq_from_gsi(gsi); |
| 68 | if (irq > 0) |
| 69 | return irq; |
| 70 | |
Konrad Rzeszutek Wilk | 78316ad | 2011-07-06 15:15:23 -0400 | [diff] [blame] | 71 | if (set_pirq) |
| 72 | pirq = gsi; |
| 73 | |
Jeremy Fitzhardinge | 38aa66f | 2010-09-02 14:51:39 +0100 | [diff] [blame] | 74 | map_irq.domid = DOMID_SELF; |
| 75 | map_irq.type = MAP_PIRQ_TYPE_GSI; |
| 76 | map_irq.index = gsi; |
Ian Campbell | f4d0635 | 2011-03-10 16:08:07 +0000 | [diff] [blame] | 77 | map_irq.pirq = pirq; |
Jeremy Fitzhardinge | 38aa66f | 2010-09-02 14:51:39 +0100 | [diff] [blame] | 78 | |
| 79 | rc = HYPERVISOR_physdev_op(PHYSDEVOP_map_pirq, &map_irq); |
| 80 | if (rc) { |
| 81 | printk(KERN_WARNING "xen map irq failed %d\n", rc); |
| 82 | return -1; |
| 83 | } |
| 84 | |
Konrad Rzeszutek Wilk | 30bd35e | 2011-07-06 10:48:22 -0400 | [diff] [blame] | 85 | if (triggering == ACPI_EDGE_SENSITIVE) { |
| 86 | shareable = 0; |
| 87 | name = "ioapic-edge"; |
| 88 | } else { |
| 89 | shareable = 1; |
| 90 | name = "ioapic-level"; |
| 91 | } |
| 92 | |
| 93 | if (gsi_override >= 0) |
| 94 | gsi = gsi_override; |
| 95 | |
Konrad Rzeszutek Wilk | ed89eb6 | 2011-07-06 12:42:43 -0400 | [diff] [blame] | 96 | irq = xen_bind_pirq_gsi_to_irq(gsi, map_irq.pirq, shareable, name); |
Konrad Rzeszutek Wilk | 30bd35e | 2011-07-06 10:48:22 -0400 | [diff] [blame] | 97 | if (irq < 0) |
| 98 | goto out; |
| 99 | |
Konrad Rzeszutek Wilk | ed89eb6 | 2011-07-06 12:42:43 -0400 | [diff] [blame] | 100 | printk(KERN_DEBUG "xen: --> pirq=%d -> irq=%d (gsi=%d)\n", map_irq.pirq, irq, gsi); |
Jeremy Fitzhardinge | 38aa66f | 2010-09-02 14:51:39 +0100 | [diff] [blame] | 101 | out: |
| 102 | return irq; |
| 103 | } |
| 104 | |
Konrad Rzeszutek Wilk | ed89eb6 | 2011-07-06 12:42:43 -0400 | [diff] [blame] | 105 | static int acpi_register_gsi_xen_hvm(struct device *dev, u32 gsi, |
| 106 | int trigger, int polarity) |
| 107 | { |
| 108 | if (!xen_hvm_domain()) |
| 109 | return -1; |
| 110 | |
Konrad Rzeszutek Wilk | 78316ad | 2011-07-06 15:15:23 -0400 | [diff] [blame] | 111 | return xen_register_pirq(gsi, -1 /* no GSI override */, trigger, |
| 112 | false /* no mapping of GSI to PIRQ */); |
Konrad Rzeszutek Wilk | ed89eb6 | 2011-07-06 12:42:43 -0400 | [diff] [blame] | 113 | } |
| 114 | |
| 115 | #ifdef CONFIG_XEN_DOM0 |
Konrad Rzeszutek Wilk | ee339fe | 2011-07-06 09:43:16 -0400 | [diff] [blame] | 116 | static int xen_register_gsi(u32 gsi, int gsi_override, int triggering, int polarity) |
Jeremy Fitzhardinge | 38aa66f | 2010-09-02 14:51:39 +0100 | [diff] [blame] | 117 | { |
| 118 | int rc, irq; |
| 119 | struct physdev_setup_gsi setup_gsi; |
| 120 | |
| 121 | if (!xen_pv_domain()) |
| 122 | return -1; |
| 123 | |
| 124 | printk(KERN_DEBUG "xen: registering gsi %u triggering %d polarity %d\n", |
| 125 | gsi, triggering, polarity); |
| 126 | |
Konrad Rzeszutek Wilk | ed89eb6 | 2011-07-06 12:42:43 -0400 | [diff] [blame] | 127 | irq = xen_register_pirq(gsi, gsi_override, triggering, true); |
Jeremy Fitzhardinge | 38aa66f | 2010-09-02 14:51:39 +0100 | [diff] [blame] | 128 | |
| 129 | setup_gsi.gsi = gsi; |
| 130 | setup_gsi.triggering = (triggering == ACPI_EDGE_SENSITIVE ? 0 : 1); |
| 131 | setup_gsi.polarity = (polarity == ACPI_ACTIVE_HIGH ? 0 : 1); |
| 132 | |
| 133 | rc = HYPERVISOR_physdev_op(PHYSDEVOP_setup_gsi, &setup_gsi); |
| 134 | if (rc == -EEXIST) |
| 135 | printk(KERN_INFO "Already setup the GSI :%d\n", gsi); |
| 136 | else if (rc) { |
| 137 | printk(KERN_ERR "Failed to setup GSI :%d, err_code:%d\n", |
| 138 | gsi, rc); |
| 139 | } |
| 140 | |
| 141 | return irq; |
| 142 | } |
| 143 | |
Konrad Rzeszutek Wilk | fef6e26 | 2011-07-06 10:16:21 -0400 | [diff] [blame] | 144 | static int acpi_register_gsi_xen(struct device *dev, u32 gsi, |
| 145 | int trigger, int polarity) |
| 146 | { |
| 147 | return xen_register_gsi(gsi, -1 /* no GSI override */, trigger, polarity); |
| 148 | } |
| 149 | #endif |
Konrad Rzeszutek Wilk | d92edd8 | 2011-07-06 10:41:47 -0400 | [diff] [blame] | 150 | #endif |
Konrad Rzeszutek Wilk | fef6e26 | 2011-07-06 10:16:21 -0400 | [diff] [blame] | 151 | |
| 152 | #if defined(CONFIG_PCI_MSI) |
| 153 | #include <linux/msi.h> |
| 154 | #include <asm/msidef.h> |
| 155 | |
| 156 | struct xen_pci_frontend_ops *xen_pci_frontend; |
| 157 | EXPORT_SYMBOL_GPL(xen_pci_frontend); |
| 158 | |
Konrad Rzeszutek Wilk | fef6e26 | 2011-07-06 10:16:21 -0400 | [diff] [blame] | 159 | static int xen_setup_msi_irqs(struct pci_dev *dev, int nvec, int type) |
| 160 | { |
| 161 | int irq, ret, i; |
| 162 | struct msi_desc *msidesc; |
| 163 | int *v; |
| 164 | |
| 165 | v = kzalloc(sizeof(int) * max(1, nvec), GFP_KERNEL); |
| 166 | if (!v) |
| 167 | return -ENOMEM; |
| 168 | |
| 169 | if (type == PCI_CAP_ID_MSIX) |
| 170 | ret = xen_pci_frontend_enable_msix(dev, v, nvec); |
| 171 | else |
| 172 | ret = xen_pci_frontend_enable_msi(dev, v); |
| 173 | if (ret) |
| 174 | goto error; |
| 175 | i = 0; |
| 176 | list_for_each_entry(msidesc, &dev->msi_list, list) { |
| 177 | irq = xen_bind_pirq_msi_to_irq(dev, msidesc, v[i], 0, |
| 178 | (type == PCI_CAP_ID_MSIX) ? |
| 179 | "pcifront-msi-x" : |
| 180 | "pcifront-msi", |
| 181 | DOMID_SELF); |
Konrad Rzeszutek Wilk | e659922 | 2011-09-29 13:26:45 -0400 | [diff] [blame] | 182 | if (irq < 0) { |
| 183 | ret = irq; |
Konrad Rzeszutek Wilk | fef6e26 | 2011-07-06 10:16:21 -0400 | [diff] [blame] | 184 | goto free; |
Konrad Rzeszutek Wilk | e659922 | 2011-09-29 13:26:45 -0400 | [diff] [blame] | 185 | } |
Konrad Rzeszutek Wilk | fef6e26 | 2011-07-06 10:16:21 -0400 | [diff] [blame] | 186 | i++; |
| 187 | } |
| 188 | kfree(v); |
| 189 | return 0; |
| 190 | |
| 191 | error: |
| 192 | dev_err(&dev->dev, "Xen PCI frontend has not registered MSI/MSI-X support!\n"); |
| 193 | free: |
| 194 | kfree(v); |
| 195 | return ret; |
| 196 | } |
| 197 | |
| 198 | #define XEN_PIRQ_MSI_DATA (MSI_DATA_TRIGGER_EDGE | \ |
| 199 | MSI_DATA_LEVEL_ASSERT | (3 << 8) | MSI_DATA_VECTOR(0)) |
| 200 | |
| 201 | static void xen_msi_compose_msg(struct pci_dev *pdev, unsigned int pirq, |
| 202 | struct msi_msg *msg) |
| 203 | { |
| 204 | /* We set vector == 0 to tell the hypervisor we don't care about it, |
| 205 | * but we want a pirq setup instead. |
| 206 | * We use the dest_id field to pass the pirq that we want. */ |
| 207 | msg->address_hi = MSI_ADDR_BASE_HI | MSI_ADDR_EXT_DEST_ID(pirq); |
| 208 | msg->address_lo = |
| 209 | MSI_ADDR_BASE_LO | |
| 210 | MSI_ADDR_DEST_MODE_PHYSICAL | |
| 211 | MSI_ADDR_REDIRECTION_CPU | |
| 212 | MSI_ADDR_DEST_ID(pirq); |
| 213 | |
| 214 | msg->data = XEN_PIRQ_MSI_DATA; |
| 215 | } |
| 216 | |
| 217 | static int xen_hvm_setup_msi_irqs(struct pci_dev *dev, int nvec, int type) |
| 218 | { |
| 219 | int irq, pirq; |
| 220 | struct msi_desc *msidesc; |
| 221 | struct msi_msg msg; |
| 222 | |
| 223 | list_for_each_entry(msidesc, &dev->msi_list, list) { |
| 224 | __read_msi_msg(msidesc, &msg); |
| 225 | pirq = MSI_ADDR_EXT_DEST_ID(msg.address_hi) | |
| 226 | ((msg.address_lo >> MSI_ADDR_DEST_ID_SHIFT) & 0xff); |
| 227 | if (msg.data != XEN_PIRQ_MSI_DATA || |
| 228 | xen_irq_from_pirq(pirq) < 0) { |
| 229 | pirq = xen_allocate_pirq_msi(dev, msidesc); |
Konrad Rzeszutek Wilk | e659922 | 2011-09-29 13:26:45 -0400 | [diff] [blame] | 230 | if (pirq < 0) { |
| 231 | irq = -ENODEV; |
Konrad Rzeszutek Wilk | fef6e26 | 2011-07-06 10:16:21 -0400 | [diff] [blame] | 232 | goto error; |
Konrad Rzeszutek Wilk | e659922 | 2011-09-29 13:26:45 -0400 | [diff] [blame] | 233 | } |
Konrad Rzeszutek Wilk | fef6e26 | 2011-07-06 10:16:21 -0400 | [diff] [blame] | 234 | xen_msi_compose_msg(dev, pirq, &msg); |
| 235 | __write_msi_msg(msidesc, &msg); |
| 236 | dev_dbg(&dev->dev, "xen: msi bound to pirq=%d\n", pirq); |
| 237 | } else { |
| 238 | dev_dbg(&dev->dev, |
| 239 | "xen: msi already bound to pirq=%d\n", pirq); |
| 240 | } |
| 241 | irq = xen_bind_pirq_msi_to_irq(dev, msidesc, pirq, 0, |
| 242 | (type == PCI_CAP_ID_MSIX) ? |
| 243 | "msi-x" : "msi", |
| 244 | DOMID_SELF); |
| 245 | if (irq < 0) |
| 246 | goto error; |
| 247 | dev_dbg(&dev->dev, |
| 248 | "xen: msi --> pirq=%d --> irq=%d\n", pirq, irq); |
| 249 | } |
| 250 | return 0; |
| 251 | |
| 252 | error: |
| 253 | dev_err(&dev->dev, |
| 254 | "Xen PCI frontend has not registered MSI/MSI-X support!\n"); |
Konrad Rzeszutek Wilk | e659922 | 2011-09-29 13:26:45 -0400 | [diff] [blame] | 255 | return irq; |
Konrad Rzeszutek Wilk | fef6e26 | 2011-07-06 10:16:21 -0400 | [diff] [blame] | 256 | } |
| 257 | |
| 258 | #ifdef CONFIG_XEN_DOM0 |
Jan Beulich | 55e901f | 2011-09-22 09:17:57 +0100 | [diff] [blame] | 259 | static bool __read_mostly pci_seg_supported = true; |
Stefano Stabellini | 809f926 | 2010-07-01 17:10:39 +0100 | [diff] [blame] | 260 | |
Konrad Rzeszutek Wilk | fef6e26 | 2011-07-06 10:16:21 -0400 | [diff] [blame] | 261 | static int xen_initdom_setup_msi_irqs(struct pci_dev *dev, int nvec, int type) |
| 262 | { |
| 263 | int ret = 0; |
| 264 | struct msi_desc *msidesc; |
| 265 | |
| 266 | list_for_each_entry(msidesc, &dev->msi_list, list) { |
| 267 | struct physdev_map_pirq map_irq; |
| 268 | domid_t domid; |
| 269 | |
| 270 | domid = ret = xen_find_device_domain_owner(dev); |
| 271 | /* N.B. Casting int's -ENODEV to uint16_t results in 0xFFED, |
| 272 | * hence check ret value for < 0. */ |
| 273 | if (ret < 0) |
| 274 | domid = DOMID_SELF; |
| 275 | |
| 276 | memset(&map_irq, 0, sizeof(map_irq)); |
| 277 | map_irq.domid = domid; |
Jan Beulich | 55e901f | 2011-09-22 09:17:57 +0100 | [diff] [blame] | 278 | map_irq.type = MAP_PIRQ_TYPE_MSI_SEG; |
Konrad Rzeszutek Wilk | fef6e26 | 2011-07-06 10:16:21 -0400 | [diff] [blame] | 279 | map_irq.index = -1; |
| 280 | map_irq.pirq = -1; |
Jan Beulich | 55e901f | 2011-09-22 09:17:57 +0100 | [diff] [blame] | 281 | map_irq.bus = dev->bus->number | |
| 282 | (pci_domain_nr(dev->bus) << 16); |
Konrad Rzeszutek Wilk | fef6e26 | 2011-07-06 10:16:21 -0400 | [diff] [blame] | 283 | map_irq.devfn = dev->devfn; |
| 284 | |
| 285 | if (type == PCI_CAP_ID_MSIX) { |
| 286 | int pos; |
| 287 | u32 table_offset, bir; |
| 288 | |
| 289 | pos = pci_find_capability(dev, PCI_CAP_ID_MSIX); |
| 290 | |
| 291 | pci_read_config_dword(dev, pos + PCI_MSIX_TABLE, |
| 292 | &table_offset); |
| 293 | bir = (u8)(table_offset & PCI_MSIX_FLAGS_BIRMASK); |
| 294 | |
| 295 | map_irq.table_base = pci_resource_start(dev, bir); |
| 296 | map_irq.entry_nr = msidesc->msi_attrib.entry_nr; |
| 297 | } |
| 298 | |
Jan Beulich | 55e901f | 2011-09-22 09:17:57 +0100 | [diff] [blame] | 299 | ret = -EINVAL; |
| 300 | if (pci_seg_supported) |
| 301 | ret = HYPERVISOR_physdev_op(PHYSDEVOP_map_pirq, |
| 302 | &map_irq); |
| 303 | if (ret == -EINVAL && !pci_domain_nr(dev->bus)) { |
| 304 | map_irq.type = MAP_PIRQ_TYPE_MSI; |
| 305 | map_irq.index = -1; |
| 306 | map_irq.pirq = -1; |
| 307 | map_irq.bus = dev->bus->number; |
| 308 | ret = HYPERVISOR_physdev_op(PHYSDEVOP_map_pirq, |
| 309 | &map_irq); |
| 310 | if (ret != -EINVAL) |
| 311 | pci_seg_supported = false; |
| 312 | } |
Konrad Rzeszutek Wilk | fef6e26 | 2011-07-06 10:16:21 -0400 | [diff] [blame] | 313 | if (ret) { |
| 314 | dev_warn(&dev->dev, "xen map irq failed %d for %d domain\n", |
| 315 | ret, domid); |
| 316 | goto out; |
| 317 | } |
| 318 | |
| 319 | ret = xen_bind_pirq_msi_to_irq(dev, msidesc, |
| 320 | map_irq.pirq, map_irq.index, |
| 321 | (type == PCI_CAP_ID_MSIX) ? |
| 322 | "msi-x" : "msi", |
| 323 | domid); |
| 324 | if (ret < 0) |
| 325 | goto out; |
| 326 | } |
| 327 | ret = 0; |
| 328 | out: |
| 329 | return ret; |
| 330 | } |
Tang Liang | 8605c68 | 2011-12-08 17:36:39 +0800 | [diff] [blame] | 331 | |
| 332 | static void xen_initdom_restore_msi_irqs(struct pci_dev *dev, int irq) |
| 333 | { |
| 334 | int ret = 0; |
| 335 | |
| 336 | if (pci_seg_supported) { |
| 337 | struct physdev_pci_device restore_ext; |
| 338 | |
| 339 | restore_ext.seg = pci_domain_nr(dev->bus); |
| 340 | restore_ext.bus = dev->bus->number; |
| 341 | restore_ext.devfn = dev->devfn; |
| 342 | ret = HYPERVISOR_physdev_op(PHYSDEVOP_restore_msi_ext, |
| 343 | &restore_ext); |
| 344 | if (ret == -ENOSYS) |
| 345 | pci_seg_supported = false; |
| 346 | WARN(ret && ret != -ENOSYS, "restore_msi_ext -> %d\n", ret); |
| 347 | } |
| 348 | if (!pci_seg_supported) { |
| 349 | struct physdev_restore_msi restore; |
| 350 | |
| 351 | restore.bus = dev->bus->number; |
| 352 | restore.devfn = dev->devfn; |
| 353 | ret = HYPERVISOR_physdev_op(PHYSDEVOP_restore_msi, &restore); |
| 354 | WARN(ret && ret != -ENOSYS, "restore_msi -> %d\n", ret); |
| 355 | } |
| 356 | } |
Konrad Rzeszutek Wilk | fef6e26 | 2011-07-06 10:16:21 -0400 | [diff] [blame] | 357 | #endif |
| 358 | |
| 359 | static void xen_teardown_msi_irqs(struct pci_dev *dev) |
| 360 | { |
| 361 | struct msi_desc *msidesc; |
| 362 | |
| 363 | msidesc = list_entry(dev->msi_list.next, struct msi_desc, list); |
| 364 | if (msidesc->msi_attrib.is_msix) |
| 365 | xen_pci_frontend_disable_msix(dev); |
| 366 | else |
| 367 | xen_pci_frontend_disable_msi(dev); |
| 368 | |
| 369 | /* Free the IRQ's and the msidesc using the generic code. */ |
| 370 | default_teardown_msi_irqs(dev); |
| 371 | } |
| 372 | |
| 373 | static void xen_teardown_msi_irq(unsigned int irq) |
| 374 | { |
| 375 | xen_destroy_irq(irq); |
| 376 | } |
| 377 | |
| 378 | #endif |
| 379 | |
Konrad Rzeszutek Wilk | fef6e26 | 2011-07-06 10:16:21 -0400 | [diff] [blame] | 380 | int __init pci_xen_init(void) |
| 381 | { |
| 382 | if (!xen_pv_domain() || xen_initial_domain()) |
| 383 | return -ENODEV; |
| 384 | |
| 385 | printk(KERN_INFO "PCI: setting up Xen PCI frontend stub\n"); |
| 386 | |
| 387 | pcibios_set_cache_line_size(); |
| 388 | |
| 389 | pcibios_enable_irq = xen_pcifront_enable_irq; |
| 390 | pcibios_disable_irq = NULL; |
| 391 | |
| 392 | #ifdef CONFIG_ACPI |
| 393 | /* Keep ACPI out of the picture */ |
| 394 | acpi_noirq = 1; |
| 395 | #endif |
| 396 | |
| 397 | #ifdef CONFIG_PCI_MSI |
| 398 | x86_msi.setup_msi_irqs = xen_setup_msi_irqs; |
| 399 | x86_msi.teardown_msi_irq = xen_teardown_msi_irq; |
| 400 | x86_msi.teardown_msi_irqs = xen_teardown_msi_irqs; |
| 401 | #endif |
| 402 | return 0; |
| 403 | } |
| 404 | |
| 405 | int __init pci_xen_hvm_init(void) |
| 406 | { |
Stefano Stabellini | 207d543 | 2012-01-30 14:31:46 +0000 | [diff] [blame] | 407 | if (!xen_have_vector_callback || !xen_feature(XENFEAT_hvm_pirqs)) |
Konrad Rzeszutek Wilk | fef6e26 | 2011-07-06 10:16:21 -0400 | [diff] [blame] | 408 | return 0; |
| 409 | |
| 410 | #ifdef CONFIG_ACPI |
| 411 | /* |
| 412 | * We don't want to change the actual ACPI delivery model, |
| 413 | * just how GSIs get registered. |
| 414 | */ |
| 415 | __acpi_register_gsi = acpi_register_gsi_xen_hvm; |
| 416 | #endif |
| 417 | |
| 418 | #ifdef CONFIG_PCI_MSI |
| 419 | x86_msi.setup_msi_irqs = xen_hvm_setup_msi_irqs; |
| 420 | x86_msi.teardown_msi_irq = xen_teardown_msi_irq; |
| 421 | #endif |
| 422 | return 0; |
| 423 | } |
| 424 | |
| 425 | #ifdef CONFIG_XEN_DOM0 |
Jeremy Fitzhardinge | 38aa66f | 2010-09-02 14:51:39 +0100 | [diff] [blame] | 426 | static __init void xen_setup_acpi_sci(void) |
| 427 | { |
| 428 | int rc; |
| 429 | int trigger, polarity; |
| 430 | int gsi = acpi_sci_override_gsi; |
Konrad Rzeszutek Wilk | ee339fe | 2011-07-06 09:43:16 -0400 | [diff] [blame] | 431 | int irq = -1; |
| 432 | int gsi_override = -1; |
Jeremy Fitzhardinge | 38aa66f | 2010-09-02 14:51:39 +0100 | [diff] [blame] | 433 | |
| 434 | if (!gsi) |
| 435 | return; |
| 436 | |
| 437 | rc = acpi_get_override_irq(gsi, &trigger, &polarity); |
| 438 | if (rc) { |
| 439 | printk(KERN_WARNING "xen: acpi_get_override_irq failed for acpi" |
| 440 | " sci, rc=%d\n", rc); |
| 441 | return; |
| 442 | } |
| 443 | trigger = trigger ? ACPI_LEVEL_SENSITIVE : ACPI_EDGE_SENSITIVE; |
| 444 | polarity = polarity ? ACPI_ACTIVE_LOW : ACPI_ACTIVE_HIGH; |
Konrad Rzeszutek Wilk | 996c34a | 2011-06-06 12:22:23 -0400 | [diff] [blame] | 445 | |
Jeremy Fitzhardinge | 38aa66f | 2010-09-02 14:51:39 +0100 | [diff] [blame] | 446 | printk(KERN_INFO "xen: sci override: global_irq=%d trigger=%d " |
| 447 | "polarity=%d\n", gsi, trigger, polarity); |
| 448 | |
Konrad Rzeszutek Wilk | ee339fe | 2011-07-06 09:43:16 -0400 | [diff] [blame] | 449 | /* Before we bind the GSI to a Linux IRQ, check whether |
| 450 | * we need to override it with bus_irq (IRQ) value. Usually for |
| 451 | * IRQs below IRQ_LEGACY_IRQ this holds IRQ == GSI, as so: |
| 452 | * ACPI: INT_SRC_OVR (bus 0 bus_irq 9 global_irq 9 low level) |
| 453 | * but there are oddballs where the IRQ != GSI: |
| 454 | * ACPI: INT_SRC_OVR (bus 0 bus_irq 9 global_irq 20 low level) |
| 455 | * which ends up being: gsi_to_irq[9] == 20 |
| 456 | * (which is what acpi_gsi_to_irq ends up calling when starting the |
| 457 | * the ACPI interpreter and keels over since IRQ 9 has not been |
| 458 | * setup as we had setup IRQ 20 for it). |
| 459 | */ |
Konrad Rzeszutek Wilk | ee339fe | 2011-07-06 09:43:16 -0400 | [diff] [blame] | 460 | if (acpi_gsi_to_irq(gsi, &irq) == 0) { |
Konrad Rzeszutek Wilk | 97ffab1 | 2011-07-06 13:03:35 -0400 | [diff] [blame] | 461 | /* Use the provided value if it's valid. */ |
| 462 | if (irq >= 0) |
Konrad Rzeszutek Wilk | ee339fe | 2011-07-06 09:43:16 -0400 | [diff] [blame] | 463 | gsi_override = irq; |
| 464 | } |
| 465 | |
| 466 | gsi = xen_register_gsi(gsi, gsi_override, trigger, polarity); |
Jeremy Fitzhardinge | 38aa66f | 2010-09-02 14:51:39 +0100 | [diff] [blame] | 467 | printk(KERN_INFO "xen: acpi sci %d\n", gsi); |
| 468 | |
| 469 | return; |
| 470 | } |
Konrad Rzeszutek Wilk | a0ee056 | 2011-06-09 09:49:13 -0400 | [diff] [blame] | 471 | |
| 472 | int __init pci_xen_initial_domain(void) |
Jeremy Fitzhardinge | 38aa66f | 2010-09-02 14:51:39 +0100 | [diff] [blame] | 473 | { |
Konrad Rzeszutek Wilk | 78316ad | 2011-07-06 15:15:23 -0400 | [diff] [blame] | 474 | int irq; |
Konrad Rzeszutek Wilk | a0ee056 | 2011-06-09 09:49:13 -0400 | [diff] [blame] | 475 | |
Qing He | f731e3ef | 2010-10-11 15:30:09 +0100 | [diff] [blame] | 476 | #ifdef CONFIG_PCI_MSI |
| 477 | x86_msi.setup_msi_irqs = xen_initdom_setup_msi_irqs; |
| 478 | x86_msi.teardown_msi_irq = xen_teardown_msi_irq; |
Tang Liang | 8605c68 | 2011-12-08 17:36:39 +0800 | [diff] [blame] | 479 | x86_msi.restore_msi_irqs = xen_initdom_restore_msi_irqs; |
Qing He | f731e3ef | 2010-10-11 15:30:09 +0100 | [diff] [blame] | 480 | #endif |
Jeremy Fitzhardinge | 38aa66f | 2010-09-02 14:51:39 +0100 | [diff] [blame] | 481 | xen_setup_acpi_sci(); |
| 482 | __acpi_register_gsi = acpi_register_gsi_xen; |
Jeremy Fitzhardinge | 38aa66f | 2010-09-02 14:51:39 +0100 | [diff] [blame] | 483 | /* Pre-allocate legacy irqs */ |
| 484 | for (irq = 0; irq < NR_IRQS_LEGACY; irq++) { |
| 485 | int trigger, polarity; |
| 486 | |
| 487 | if (acpi_get_override_irq(irq, &trigger, &polarity) == -1) |
| 488 | continue; |
| 489 | |
Konrad Rzeszutek Wilk | ee339fe | 2011-07-06 09:43:16 -0400 | [diff] [blame] | 490 | xen_register_pirq(irq, -1 /* no GSI override */, |
Konrad Rzeszutek Wilk | ed89eb6 | 2011-07-06 12:42:43 -0400 | [diff] [blame] | 491 | trigger ? ACPI_LEVEL_SENSITIVE : ACPI_EDGE_SENSITIVE, |
Konrad Rzeszutek Wilk | 78316ad | 2011-07-06 15:15:23 -0400 | [diff] [blame] | 492 | true /* Map GSI to PIRQ */); |
Jeremy Fitzhardinge | 38aa66f | 2010-09-02 14:51:39 +0100 | [diff] [blame] | 493 | } |
Konrad Rzeszutek Wilk | 9b6519d | 2011-06-06 14:20:35 -0400 | [diff] [blame] | 494 | if (0 == nr_ioapics) { |
Konrad Rzeszutek Wilk | 78316ad | 2011-07-06 15:15:23 -0400 | [diff] [blame] | 495 | for (irq = 0; irq < NR_IRQS_LEGACY; irq++) |
| 496 | xen_bind_pirq_gsi_to_irq(irq, irq, 0, "xt-pic"); |
Konrad Rzeszutek Wilk | 9b6519d | 2011-06-06 14:20:35 -0400 | [diff] [blame] | 497 | } |
Konrad Rzeszutek Wilk | a0ee056 | 2011-06-09 09:49:13 -0400 | [diff] [blame] | 498 | return 0; |
Jeremy Fitzhardinge | 38aa66f | 2010-09-02 14:51:39 +0100 | [diff] [blame] | 499 | } |
Konrad Rzeszutek Wilk | c55fa78 | 2010-11-08 14:13:35 -0500 | [diff] [blame] | 500 | |
| 501 | struct xen_device_domain_owner { |
| 502 | domid_t domain; |
| 503 | struct pci_dev *dev; |
| 504 | struct list_head list; |
| 505 | }; |
| 506 | |
| 507 | static DEFINE_SPINLOCK(dev_domain_list_spinlock); |
| 508 | static struct list_head dev_domain_list = LIST_HEAD_INIT(dev_domain_list); |
| 509 | |
| 510 | static struct xen_device_domain_owner *find_device(struct pci_dev *dev) |
| 511 | { |
| 512 | struct xen_device_domain_owner *owner; |
| 513 | |
| 514 | list_for_each_entry(owner, &dev_domain_list, list) { |
| 515 | if (owner->dev == dev) |
| 516 | return owner; |
| 517 | } |
| 518 | return NULL; |
| 519 | } |
| 520 | |
| 521 | int xen_find_device_domain_owner(struct pci_dev *dev) |
| 522 | { |
| 523 | struct xen_device_domain_owner *owner; |
| 524 | int domain = -ENODEV; |
| 525 | |
| 526 | spin_lock(&dev_domain_list_spinlock); |
| 527 | owner = find_device(dev); |
| 528 | if (owner) |
| 529 | domain = owner->domain; |
| 530 | spin_unlock(&dev_domain_list_spinlock); |
| 531 | return domain; |
| 532 | } |
| 533 | EXPORT_SYMBOL_GPL(xen_find_device_domain_owner); |
| 534 | |
| 535 | int xen_register_device_domain_owner(struct pci_dev *dev, uint16_t domain) |
| 536 | { |
| 537 | struct xen_device_domain_owner *owner; |
| 538 | |
| 539 | owner = kzalloc(sizeof(struct xen_device_domain_owner), GFP_KERNEL); |
| 540 | if (!owner) |
| 541 | return -ENODEV; |
| 542 | |
| 543 | spin_lock(&dev_domain_list_spinlock); |
| 544 | if (find_device(dev)) { |
| 545 | spin_unlock(&dev_domain_list_spinlock); |
| 546 | kfree(owner); |
| 547 | return -EEXIST; |
| 548 | } |
| 549 | owner->domain = domain; |
| 550 | owner->dev = dev; |
| 551 | list_add_tail(&owner->list, &dev_domain_list); |
| 552 | spin_unlock(&dev_domain_list_spinlock); |
| 553 | return 0; |
| 554 | } |
| 555 | EXPORT_SYMBOL_GPL(xen_register_device_domain_owner); |
| 556 | |
| 557 | int xen_unregister_device_domain_owner(struct pci_dev *dev) |
| 558 | { |
| 559 | struct xen_device_domain_owner *owner; |
| 560 | |
| 561 | spin_lock(&dev_domain_list_spinlock); |
| 562 | owner = find_device(dev); |
| 563 | if (!owner) { |
| 564 | spin_unlock(&dev_domain_list_spinlock); |
| 565 | return -ENODEV; |
| 566 | } |
| 567 | list_del(&owner->list); |
| 568 | spin_unlock(&dev_domain_list_spinlock); |
| 569 | kfree(owner); |
| 570 | return 0; |
| 571 | } |
| 572 | EXPORT_SYMBOL_GPL(xen_unregister_device_domain_owner); |
Konrad Rzeszutek Wilk | 7c1bfd6 | 2011-05-16 13:47:30 -0400 | [diff] [blame] | 573 | #endif |