diff options
| -rw-r--r-- | drivers/xen/xen-pciback/conf_space_capability_msi.c | 17 | ||||
| -rw-r--r-- | drivers/xen/xen-pciback/conf_space_header.c | 6 | ||||
| -rw-r--r-- | drivers/xen/xen-pciback/pci_stub.c | 90 | ||||
| -rw-r--r-- | drivers/xen/xen-pciback/pciback.h | 13 | ||||
| -rw-r--r-- | drivers/xen/xen-pciback/pciback_ops.c | 102 |
5 files changed, 223 insertions, 5 deletions
diff --git a/drivers/xen/xen-pciback/conf_space_capability_msi.c b/drivers/xen/xen-pciback/conf_space_capability_msi.c index 78f74b1852d..d0d2255b5da 100644 --- a/drivers/xen/xen-pciback/conf_space_capability_msi.c +++ b/drivers/xen/xen-pciback/conf_space_capability_msi.c @@ -12,6 +12,7 @@ int pciback_enable_msi(struct pciback_device *pdev, struct pci_dev *dev, struct xen_pci_op *op) { + struct pciback_dev_data *dev_data; int otherend = pdev->xdev->otherend_id; int status; @@ -28,21 +29,29 @@ int pciback_enable_msi(struct pciback_device *pdev, * the local domain's IRQ number. */ op->value = dev->irq ? xen_pirq_from_irq(dev->irq) : 0; + dev_data = pci_get_drvdata(dev); + if (dev_data) + dev_data->ack_intr = 0; return 0; } int pciback_disable_msi(struct pciback_device *pdev, struct pci_dev *dev, struct xen_pci_op *op) { + struct pciback_dev_data *dev_data; pci_disable_msi(dev); op->value = dev->irq ? xen_pirq_from_irq(dev->irq) : 0; + dev_data = pci_get_drvdata(dev); + if (dev_data) + dev_data->ack_intr = 1; return 0; } int pciback_enable_msix(struct pciback_device *pdev, struct pci_dev *dev, struct xen_pci_op *op) { + struct pciback_dev_data *dev_data; int i, result; struct msix_entry *entries; @@ -74,6 +83,9 @@ int pciback_enable_msix(struct pciback_device *pdev, kfree(entries); op->value = result; + dev_data = pci_get_drvdata(dev); + if (dev_data) + dev_data->ack_intr = 0; return result; } @@ -81,6 +93,7 @@ int pciback_enable_msix(struct pciback_device *pdev, int pciback_disable_msix(struct pciback_device *pdev, struct pci_dev *dev, struct xen_pci_op *op) { + struct pciback_dev_data *dev_data; pci_disable_msix(dev); @@ -89,6 +102,10 @@ int pciback_disable_msix(struct pciback_device *pdev, * an undefined IRQ value of zero. */ op->value = dev->irq ? xen_pirq_from_irq(dev->irq) : 0; + dev_data = pci_get_drvdata(dev); + if (dev_data) + dev_data->ack_intr = 1; + return 0; } diff --git a/drivers/xen/xen-pciback/conf_space_header.c b/drivers/xen/xen-pciback/conf_space_header.c index dcd6dd964e3..22ad0f56066 100644 --- a/drivers/xen/xen-pciback/conf_space_header.c +++ b/drivers/xen/xen-pciback/conf_space_header.c @@ -39,8 +39,10 @@ static int command_read(struct pci_dev *dev, int offset, u16 *value, void *data) static int command_write(struct pci_dev *dev, int offset, u16 value, void *data) { + struct pciback_dev_data *dev_data; int err; + dev_data = pci_get_drvdata(dev); if (!pci_is_enabled(dev) && is_enable_cmd(value)) { if (unlikely(verbose_request)) printk(KERN_DEBUG "pciback: %s: enable\n", @@ -48,11 +50,15 @@ static int command_write(struct pci_dev *dev, int offset, u16 value, void *data) err = pci_enable_device(dev); if (err) return err; + if (dev_data) + dev_data->enable_intx = 1; } else if (pci_is_enabled(dev) && !is_enable_cmd(value)) { if (unlikely(verbose_request)) printk(KERN_DEBUG "pciback: %s: disable\n", pci_name(dev)); pci_disable_device(dev); + if (dev_data) + dev_data->enable_intx = 0; } if (!dev->is_busmaster && is_master_cmd(value)) { diff --git a/drivers/xen/xen-pciback/pci_stub.c b/drivers/xen/xen-pciback/pci_stub.c index ac8396d8206..c4d1071ebbe 100644 --- a/drivers/xen/xen-pciback/pci_stub.c +++ b/drivers/xen/xen-pciback/pci_stub.c @@ -21,6 +21,8 @@ #include "conf_space.h" #include "conf_space_quirks.h" +#define DRV_NAME "pciback" + static char *pci_devs_to_hide; wait_queue_head_t aer_wait_queue; /*Add sem for sync AER handling and pciback remove/reconfigue ops, @@ -290,13 +292,20 @@ static int __devinit pcistub_init_device(struct pci_dev *dev) * would need to be called somewhere to free the memory allocated * here and then to call kfree(pci_get_drvdata(psdev->dev)). */ - dev_data = kzalloc(sizeof(*dev_data), GFP_ATOMIC); + dev_data = kzalloc(sizeof(*dev_data) + strlen(DRV_NAME "[]") + + strlen(pci_name(dev)) + 1, GFP_ATOMIC); if (!dev_data) { err = -ENOMEM; goto out; } pci_set_drvdata(dev, dev_data); + /* + * Setup name for fake IRQ handler. It will only be enabled + * once the device is turned on by the guest. + */ + sprintf(dev_data->irq_name, DRV_NAME "[%s]", pci_name(dev)); + dev_dbg(&dev->dev, "initializing config\n"); init_waitqueue_head(&aer_wait_queue); @@ -837,7 +846,7 @@ static struct pci_error_handlers pciback_error_handler = { */ static struct pci_driver pciback_pci_driver = { - .name = "pciback", + .name = DRV_NAME, .id_table = pcistub_ids, .probe = pcistub_probe, .remove = pcistub_remove, @@ -1029,6 +1038,72 @@ static ssize_t pcistub_slot_show(struct device_driver *drv, char *buf) DRIVER_ATTR(slots, S_IRUSR, pcistub_slot_show, NULL); +static ssize_t pcistub_irq_handler_show(struct device_driver *drv, char *buf) +{ + struct pcistub_device *psdev; + struct pciback_dev_data *dev_data; + size_t count = 0; + unsigned long flags; + + spin_lock_irqsave(&pcistub_devices_lock, flags); + list_for_each_entry(psdev, &pcistub_devices, dev_list) { + if (count >= PAGE_SIZE) + break; + if (!psdev->dev) + continue; + dev_data = pci_get_drvdata(psdev->dev); + if (!dev_data) + continue; + count += + scnprintf(buf + count, PAGE_SIZE - count, + "%s:%s:%sing:%ld\n", + pci_name(psdev->dev), + dev_data->isr_on ? "on" : "off", + dev_data->ack_intr ? "ack" : "not ack", + dev_data->handled); + } + spin_unlock_irqrestore(&pcistub_devices_lock, flags); + return count; +} + +DRIVER_ATTR(irq_handlers, S_IRUSR, pcistub_irq_handler_show, NULL); + +static ssize_t pcistub_irq_handler_switch(struct device_driver *drv, + const char *buf, + size_t count) +{ + struct pcistub_device *psdev; + struct pciback_dev_data *dev_data; + int domain, bus, slot, func; + int err = -ENOENT; + + err = str_to_slot(buf, &domain, &bus, &slot, &func); + if (err) + goto out; + + psdev = pcistub_device_find(domain, bus, slot, func); + + if (!psdev) + goto out; + + dev_data = pci_get_drvdata(psdev->dev); + if (!dev_data) + goto out; + + dev_dbg(&psdev->dev->dev, "%s fake irq handler: %d->%d\n", + dev_data->irq_name, dev_data->isr_on, + !dev_data->isr_on); + + dev_data->isr_on = !(dev_data->isr_on); + if (dev_data->isr_on) + dev_data->ack_intr = 1; +out: + if (!err) + err = count; + return err; +} +DRIVER_ATTR(irq_handler_state, S_IWUSR, NULL, pcistub_irq_handler_switch); + static ssize_t pcistub_quirk_add(struct device_driver *drv, const char *buf, size_t count) { @@ -1168,7 +1243,10 @@ static void pcistub_exit(void) driver_remove_file(&pciback_pci_driver.driver, &driver_attr_slots); driver_remove_file(&pciback_pci_driver.driver, &driver_attr_quirks); driver_remove_file(&pciback_pci_driver.driver, &driver_attr_permissive); - + driver_remove_file(&pciback_pci_driver.driver, + &driver_attr_irq_handlers); + driver_remove_file(&pciback_pci_driver.driver, + &driver_attr_irq_handler_state); pci_unregister_driver(&pciback_pci_driver); } @@ -1227,6 +1305,12 @@ static int __init pcistub_init(void) err = driver_create_file(&pciback_pci_driver.driver, &driver_attr_permissive); + if (!err) + err = driver_create_file(&pciback_pci_driver.driver, + &driver_attr_irq_handlers); + if (!err) + err = driver_create_file(&pciback_pci_driver.driver, + &driver_attr_irq_handler_state); if (err) pcistub_exit(); diff --git a/drivers/xen/xen-pciback/pciback.h b/drivers/xen/xen-pciback/pciback.h index c1e95e88ee9..5c140200a5e 100644 --- a/drivers/xen/xen-pciback/pciback.h +++ b/drivers/xen/xen-pciback/pciback.h @@ -45,8 +45,14 @@ struct pciback_device { struct pciback_dev_data { struct list_head config_fields; - int permissive; - int warned_on_write; + unsigned int permissive:1; + unsigned int warned_on_write:1; + unsigned int enable_intx:1; + unsigned int isr_on:1; /* Whether the IRQ handler is installed. */ + unsigned int ack_intr:1; /* .. and ACK-ing */ + unsigned long handled; + unsigned int irq; /* Saved in case device transitions to MSI/MSI-X */ + char irq_name[0]; /* pciback[000:04:00.0] */ }; /* Used by XenBus and pciback_ops.c */ @@ -131,3 +137,6 @@ extern int verbose_request; void test_and_schedule_op(struct pciback_device *pdev); #endif +/* Handles shared IRQs that can to device domain and control domain. */ +void pciback_irq_handler(struct pci_dev *dev, int reset); +irqreturn_t pciback_guest_interrupt(int irq, void *dev_id); diff --git a/drivers/xen/xen-pciback/pciback_ops.c b/drivers/xen/xen-pciback/pciback_ops.c index 011db675e43..6c398fde7a8 100644 --- a/drivers/xen/xen-pciback/pciback_ops.c +++ b/drivers/xen/xen-pciback/pciback_ops.c @@ -13,6 +13,77 @@ int verbose_request; module_param(verbose_request, int, 0644); +/* Ensure a device is has the fake IRQ handler "turned on/off" and is + * ready to be exported. This MUST be run after pciback_reset_device + * which does the actual PCI device enable/disable. + */ +void pciback_control_isr(struct pci_dev *dev, int reset) +{ + struct pciback_dev_data *dev_data; + int rc; + int enable = 0; + + dev_data = pci_get_drvdata(dev); + if (!dev_data) + return; + + /* We don't deal with bridges */ + if (dev->hdr_type != PCI_HEADER_TYPE_NORMAL) + return; + + if (reset) { + dev_data->enable_intx = 0; + dev_data->ack_intr = 0; + } + enable = dev_data->enable_intx; + + /* Asked to disable, but ISR isn't runnig */ + if (!enable && !dev_data->isr_on) + return; + + /* Squirrel away the IRQs in the dev_data. We need this + * b/c when device transitions to MSI, the dev->irq is + * overwritten with the MSI vector. + */ + if (enable) + dev_data->irq = dev->irq; + + dev_dbg(&dev->dev, "%s: #%d %s %s%s %s-> %s\n", + dev_data->irq_name, + dev_data->irq, + pci_is_enabled(dev) ? "on" : "off", + dev->msi_enabled ? "MSI" : "", + dev->msix_enabled ? "MSI/X" : "", + dev_data->isr_on ? "enable" : "disable", + enable ? "enable" : "disable"); + + if (enable) { + rc = request_irq(dev_data->irq, + pciback_guest_interrupt, IRQF_SHARED, + dev_data->irq_name, dev); + if (rc) { + dev_err(&dev->dev, "%s: failed to install fake IRQ " \ + "handler for IRQ %d! (rc:%d)\n", + dev_data->irq_name, dev_data->irq, rc); + goto out; + } + } else { + free_irq(dev_data->irq, dev); + dev_data->irq = 0; + } + dev_data->isr_on = enable; + dev_data->ack_intr = enable; +out: + dev_dbg(&dev->dev, "%s: #%d %s %s%s %s\n", + dev_data->irq_name, + dev_data->irq, + pci_is_enabled(dev) ? "on" : "off", + dev->msi_enabled ? "MSI" : "", + dev->msix_enabled ? "MSI/X" : "", + enable ? (dev_data->isr_on ? "enabled" : "failed to enable") : + (dev_data->isr_on ? "failed to disable" : "disabled")); +} + /* Ensure a device is "turned off" and ready to be exported. * (Also see pciback_config_reset to ensure virtual configuration space is * ready to be re-exported) @@ -21,6 +92,8 @@ void pciback_reset_device(struct pci_dev *dev) { u16 cmd; + pciback_control_isr(dev, 1 /* reset device */); + /* Disable devices (but not bridges) */ if (dev->hdr_type == PCI_HEADER_TYPE_NORMAL) { #ifdef CONFIG_PCI_MSI @@ -78,13 +151,18 @@ void pciback_do_op(struct work_struct *data) struct pciback_device *pdev = container_of(data, struct pciback_device, op_work); struct pci_dev *dev; + struct pciback_dev_data *dev_data = NULL; struct xen_pci_op *op = &pdev->sh_info->op; + int test_intx = 0; dev = pciback_get_pci_dev(pdev, op->domain, op->bus, op->devfn); if (dev == NULL) op->err = XEN_PCI_ERR_dev_not_found; else { + dev_data = pci_get_drvdata(dev); + if (dev_data) + test_intx = dev_data->enable_intx; switch (op->cmd) { case XEN_PCI_OP_conf_read: op->err = pciback_config_read(dev, @@ -113,6 +191,11 @@ void pciback_do_op(struct work_struct *data) break; } } + if (!op->err && dev && dev_data) { + /* Transition detected */ + if ((dev_data->enable_intx != test_intx)) + pciback_control_isr(dev, 0 /* no reset */); + } /* Tell the driver domain that we're done. */ wmb(); clear_bit(_XEN_PCIF_active, (unsigned long *)&pdev->sh_info->flags); @@ -137,3 +220,22 @@ irqreturn_t pciback_handle_event(int irq, void *dev_id) return IRQ_HANDLED; } +irqreturn_t pciback_guest_interrupt(int irq, void *dev_id) +{ + struct pci_dev *dev = (struct pci_dev *)dev_id; + struct pciback_dev_data *dev_data = pci_get_drvdata(dev); + + if (dev_data->isr_on && dev_data->ack_intr) { + dev_data->handled++; + if ((dev_data->handled % 1000) == 0) { + if (xen_test_irq_shared(irq)) { + printk(KERN_INFO "%s IRQ line is not shared " + "with other domains. Turning ISR off\n", + dev_data->irq_name); + dev_data->ack_intr = 0; + } + } + return IRQ_HANDLED; + } + return IRQ_NONE; +} |