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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH 24/31] Rename the drivers/xen/pcifront/* driver to drivers/pci/xen-pcifront.c.
Also the Kconfig and Makefile are appropiately updated.
This is the last step in the rename process.
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
---
drivers/pci/Kconfig | 9 +
drivers/pci/Makefile | 2 +
drivers/pci/xen-pcifront.c | 1117 +++++++++++++++++++++++++++++++++++++++++
drivers/xen/Kconfig | 17 -
drivers/xen/Makefile | 1 -
drivers/xen/pcifront/Makefile | 7 -
drivers/xen/pcifront/xenbus.c | 1117 -----------------------------------------
7 files changed, 1128 insertions(+), 1142 deletions(-)
create mode 100644 drivers/pci/xen-pcifront.c
delete mode 100644 drivers/xen/pcifront/Makefile
delete mode 100644 drivers/xen/pcifront/xenbus.c
diff --git a/drivers/pci/Kconfig b/drivers/pci/Kconfig
index fdc864f..97a59d5 100644
--- a/drivers/pci/Kconfig
+++ b/drivers/pci/Kconfig
@@ -51,6 +51,15 @@ config PCI_STUB
When in doubt, say N.
+config XEN_PCIDEV_FRONTEND
+ bool "Xen PCI Frontend"
+ depends on PCI && X86_64
+ select HOTPLUG
+ default y
+ help
+ The PCI device frontend driver allows the kernel to import arbitrary
+ PCI devices from a PCI backend to support PCI driver domains.
+
config HT_IRQ
bool "Interrupts on hypertransport devices"
default y
diff --git a/drivers/pci/Makefile b/drivers/pci/Makefile
index 3590082..f44cc7c 100644
--- a/drivers/pci/Makefile
+++ b/drivers/pci/Makefile
@@ -59,6 +59,8 @@ obj-$(CONFIG_PCI_SYSCALL) += syscall.o
obj-$(CONFIG_PCI_STUB) += pci-stub.o
+obj-$(CONFIG_XEN_PCIDEV_FRONTEND) += xen-pcifront.o
+
ifeq ($(CONFIG_PCI_DEBUG),y)
EXTRA_CFLAGS += -DDEBUG
endif
diff --git a/drivers/pci/xen-pcifront.c b/drivers/pci/xen-pcifront.c
new file mode 100644
index 0000000..854850d
--- /dev/null
+++ b/drivers/pci/xen-pcifront.c
@@ -0,0 +1,1117 @@
+/*
+ * PCI Frontend Xenbus Setup - handles setup with backend (imports page/evtchn)
+ *
+ * Author: Ryan Wilson <hap9@xxxxxxxxxxxxxx>
+ */
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/mm.h>
+#include <xen/xenbus.h>
+#include <xen/events.h>
+#include <xen/grant_table.h>
+#include <xen/page.h>
+#include <linux/spinlock.h>
+#include <linux/pci.h>
+#include <xen/xenbus.h>
+#include <xen/interface/io/pciif.h>
+#include <linux/interrupt.h>
+#include <asm/atomic.h>
+#include <linux/workqueue.h>
+#include <asm/bitops.h>
+#include <linux/time.h>
+
+
+#ifndef __init_refok
+#define __init_refok
+#endif
+
+#define INVALID_GRANT_REF (0)
+#define INVALID_EVTCHN (-1)
+
+
+struct pci_bus_entry {
+ struct list_head list;
+ struct pci_bus *bus;
+};
+
+#define _PDEVB_op_active (0)
+#define PDEVB_op_active (1 << (_PDEVB_op_active))
+
+struct pcifront_device {
+ struct xenbus_device *xdev;
+ struct list_head root_buses;
+ spinlock_t dev_lock;
+
+ int evtchn;
+ int gnt_ref;
+
+ int irq;
+
+ /* Lock this when doing any operations in sh_info */
+ spinlock_t sh_info_lock;
+ struct xen_pci_sharedinfo *sh_info;
+ struct work_struct op_work;
+ unsigned long flags;
+
+};
+
+struct pcifront_sd {
+ int domain;
+ struct pcifront_device *pdev;
+};
+
+static inline struct pcifront_device *
+pcifront_get_pdev(struct pcifront_sd *sd)
+{
+ return sd->pdev;
+}
+
+static inline void pcifront_init_sd(struct pcifront_sd *sd,
+ unsigned int domain, unsigned int bus,
+ struct pcifront_device *pdev)
+{
+ sd->domain = domain;
+ sd->pdev = pdev;
+}
+
+static inline void pcifront_setup_root_resources(struct pci_bus *bus,
+ struct pcifront_sd *sd)
+{
+}
+
+
+DEFINE_SPINLOCK(pcifront_dev_lock);
+static struct pcifront_device *pcifront_dev = NULL;
+
+static int verbose_request = 0;
+module_param(verbose_request, int, 0644);
+
+static int errno_to_pcibios_err(int errno)
+{
+ switch (errno) {
+ case XEN_PCI_ERR_success:
+ return PCIBIOS_SUCCESSFUL;
+
+ case XEN_PCI_ERR_dev_not_found:
+ return PCIBIOS_DEVICE_NOT_FOUND;
+
+ case XEN_PCI_ERR_invalid_offset:
+ case XEN_PCI_ERR_op_failed:
+ return PCIBIOS_BAD_REGISTER_NUMBER;
+
+ case XEN_PCI_ERR_not_implemented:
+ return PCIBIOS_FUNC_NOT_SUPPORTED;
+
+ case XEN_PCI_ERR_access_denied:
+ return PCIBIOS_SET_FAILED;
+ }
+ return errno;
+}
+
+static inline void schedule_pcifront_aer_op(struct pcifront_device *pdev)
+{
+ if (test_bit(_XEN_PCIB_active, (unsigned long *)&pdev->sh_info->flags)
+ && !test_and_set_bit(_PDEVB_op_active, &pdev->flags)) {
+ dev_dbg(&pdev->xdev->dev, "schedule aer frontend job\n");
+ schedule_work(&pdev->op_work);
+ }
+}
+
+static int do_pci_op(struct pcifront_device *pdev, struct xen_pci_op *op)
+{
+ int err = 0;
+ struct xen_pci_op *active_op = &pdev->sh_info->op;
+ unsigned long irq_flags;
+ evtchn_port_t port = pdev->evtchn;
+ unsigned irq = pdev->irq;
+ s64 ns, ns_timeout;
+ struct timeval tv;
+
+ spin_lock_irqsave(&pdev->sh_info_lock, irq_flags);
+
+ memcpy(active_op, op, sizeof(struct xen_pci_op));
+
+ /* Go */
+ wmb();
+ set_bit(_XEN_PCIF_active, (unsigned long *)&pdev->sh_info->flags);
+ notify_remote_via_evtchn(port);
+
+ /*
+ * We set a poll timeout of 3 seconds but give up on return after
+ * 2 seconds. It is better to time out too late rather than too early
+ * (in the latter case we end up continually re-executing poll() with a
+ * timeout in the past). 1s difference gives plenty of slack for error.
+ */
+ do_gettimeofday(&tv);
+ ns_timeout = timeval_to_ns(&tv) + 2 * (s64)NSEC_PER_SEC;
+
+ xen_clear_irq_pending(irq);
+
+ while (test_bit(_XEN_PCIF_active,
+ (unsigned long *)&pdev->sh_info->flags)) {
+ xen_poll_irq_timeout(irq, jiffies + 3*HZ);
+ xen_clear_irq_pending(irq);
+ do_gettimeofday(&tv);
+ ns = timeval_to_ns(&tv);
+ if (ns > ns_timeout) {
+ dev_err(&pdev->xdev->dev,
+ "pciback not responding!!!\n");
+ clear_bit(_XEN_PCIF_active,
+ (unsigned long *)&pdev->sh_info->flags);
+ err = XEN_PCI_ERR_dev_not_found;
+ goto out;
+ }
+ }
+
+ /*
+ * We might lose backend service request since we
+ * reuse same evtchn with pci_conf backend response. So re-schedule
+ * aer pcifront service.
+ */
+ if (test_bit(_XEN_PCIB_active,
+ (unsigned long*)&pdev->sh_info->flags)) {
+ dev_err(&pdev->xdev->dev,
+ "schedule aer pcifront service\n");
+ schedule_pcifront_aer_op(pdev);
+ }
+
+ memcpy(op, active_op, sizeof(struct xen_pci_op));
+
+ err = op->err;
+ out:
+ spin_unlock_irqrestore(&pdev->sh_info_lock, irq_flags);
+ return err;
+}
+
+/* Access to this function is spinlocked in drivers/pci/access.c */
+static int pcifront_bus_read(struct pci_bus *bus, unsigned int devfn,
+ int where, int size, u32 * val)
+{
+ int err = 0;
+ struct xen_pci_op op = {
+ .cmd = XEN_PCI_OP_conf_read,
+ .domain = pci_domain_nr(bus),
+ .bus = bus->number,
+ .devfn = devfn,
+ .offset = where,
+ .size = size,
+ };
+ struct pcifront_sd *sd = bus->sysdata;
+ struct pcifront_device *pdev = pcifront_get_pdev(sd);
+
+ if (verbose_request)
+ dev_info(&pdev->xdev->dev,
+ "read dev=%04x:%02x:%02x.%01x - offset %x size %d\n",
+ pci_domain_nr(bus), bus->number, PCI_SLOT(devfn),
+ PCI_FUNC(devfn), where, size);
+
+ err = do_pci_op(pdev, &op);
+
+ if (likely(!err)) {
+ if (verbose_request)
+ dev_info(&pdev->xdev->dev, "read got back value %x\n",
+ op.value);
+
+ *val = op.value;
+ } else if (err == -ENODEV) {
+ /* No device here, pretend that it just returned 0 */
+ err = 0;
+ *val = 0;
+ }
+
+ return errno_to_pcibios_err(err);
+}
+
+/* Access to this function is spinlocked in drivers/pci/access.c */
+static int pcifront_bus_write(struct pci_bus *bus, unsigned int devfn,
+ int where, int size, u32 val)
+{
+ struct xen_pci_op op = {
+ .cmd = XEN_PCI_OP_conf_write,
+ .domain = pci_domain_nr(bus),
+ .bus = bus->number,
+ .devfn = devfn,
+ .offset = where,
+ .size = size,
+ .value = val,
+ };
+ struct pcifront_sd *sd = bus->sysdata;
+ struct pcifront_device *pdev = pcifront_get_pdev(sd);
+
+ if (verbose_request)
+ dev_info(&pdev->xdev->dev,
+ "write dev=%04x:%02x:%02x.%01x - "
+ "offset %x size %d val %x\n",
+ pci_domain_nr(bus), bus->number,
+ PCI_SLOT(devfn), PCI_FUNC(devfn), where, size, val);
+
+ return errno_to_pcibios_err(do_pci_op(pdev, &op));
+}
+
+struct pci_ops pcifront_bus_ops = {
+ .read = pcifront_bus_read,
+ .write = pcifront_bus_write,
+};
+
+#ifdef CONFIG_PCI_MSI
+int pci_frontend_enable_msix(struct pci_dev *dev,
+ struct msix_entry *entries,
+ int nvec)
+{
+ int err;
+ int i;
+ struct xen_pci_op op = {
+ .cmd = XEN_PCI_OP_enable_msix,
+ .domain = pci_domain_nr(dev->bus),
+ .bus = dev->bus->number,
+ .devfn = dev->devfn,
+ .value = nvec,
+ };
+ struct pcifront_sd *sd = dev->bus->sysdata;
+ struct pcifront_device *pdev = pcifront_get_pdev(sd);
+
+ if (nvec > SH_INFO_MAX_VEC) {
+ printk("too much vector for pci frontend%x\n", nvec);
+ return -EINVAL;
+ }
+
+ for (i = 0; i < nvec; i++) {
+ op.msix_entries[i].entry = entries[i].entry;
+ op.msix_entries[i].vector = entries[i].vector;
+ }
+
+ err = do_pci_op(pdev, &op);
+
+ if (!err) {
+ if (!op.value) {
+ /* we get the result */
+ for ( i = 0; i < nvec; i++)
+ entries[i].vector = op.msix_entries[i].vector;
+ return 0;
+ }
+ else {
+ printk("enable msix get value %x\n", op.value);
+ return op.value;
+ }
+ }
+ else {
+ printk("enable msix get err %x\n", err);
+ return err;
+ }
+}
+
+void pci_frontend_disable_msix(struct pci_dev* dev)
+{
+ int err;
+ struct xen_pci_op op = {
+ .cmd = XEN_PCI_OP_disable_msix,
+ .domain = pci_domain_nr(dev->bus),
+ .bus = dev->bus->number,
+ .devfn = dev->devfn,
+ };
+ struct pcifront_sd *sd = dev->bus->sysdata;
+ struct pcifront_device *pdev = pcifront_get_pdev(sd);
+
+ err = do_pci_op(pdev, &op);
+
+ /* What should do for error ? */
+ if (err)
+ printk("pci_disable_msix get err %x\n", err);
+}
+
+int pci_frontend_enable_msi(struct pci_dev *dev)
+{
+ int err;
+ struct xen_pci_op op = {
+ .cmd = XEN_PCI_OP_enable_msi,
+ .domain = pci_domain_nr(dev->bus),
+ .bus = dev->bus->number,
+ .devfn = dev->devfn,
+ };
+ struct pcifront_sd *sd = dev->bus->sysdata;
+ struct pcifront_device *pdev = pcifront_get_pdev(sd);
+
+ err = do_pci_op(pdev, &op);
+ if (likely(!err)) {
+ dev->irq = op.value;
+ }
+ else {
+ printk("pci frontend enable msi failed for dev %x:%x \n",
+ op.bus, op.devfn);
+ err = -EINVAL;
+ }
+ return err;
+}
+
+void pci_frontend_disable_msi(struct pci_dev* dev)
+{
+ int err;
+ struct xen_pci_op op = {
+ .cmd = XEN_PCI_OP_disable_msi,
+ .domain = pci_domain_nr(dev->bus),
+ .bus = dev->bus->number,
+ .devfn = dev->devfn,
+ };
+ struct pcifront_sd *sd = dev->bus->sysdata;
+ struct pcifront_device *pdev = pcifront_get_pdev(sd);
+
+ err = do_pci_op(pdev, &op);
+ if (err == XEN_PCI_ERR_dev_not_found) {
+ /* XXX No response from backend, what shall we do? */
+ printk("get no response from backend for disable MSI\n");
+ return;
+ }
+ if (likely(!err))
+ dev->irq = op.value;
+ else
+ /* how can pciback notify us fail? */
+ printk("get fake response frombackend \n");
+}
+#endif /* CONFIG_PCI_MSI */
+
+/* Claim resources for the PCI frontend as-is, backend won't allow changes */
+static int pcifront_claim_resource(struct pci_dev *dev, void *data)
+{
+ struct pcifront_device *pdev = data;
+ int i;
+ struct resource *r;
+
+ for (i = 0; i < PCI_NUM_RESOURCES; i++) {
+ r = &dev->resource[i];
+
+ if (!r->parent && r->start && r->flags) {
+ dev_dbg(&pdev->xdev->dev, "claiming resource %s/%d\n",
+ pci_name(dev), i);
+ pci_claim_resource(dev, i);
+ }
+ }
+
+ return 0;
+}
+
+int __devinit pcifront_scan_root(struct pcifront_device *pdev,
+ unsigned int domain, unsigned int bus)
+{
+ struct pci_bus *b;
+ struct pcifront_sd *sd = NULL;
+ struct pci_bus_entry *bus_entry = NULL;
+ int err = 0;
+
+#ifndef CONFIG_PCI_DOMAINS
+ if (domain != 0) {
+ dev_err(&pdev->xdev->dev,
+ "PCI Root in non-zero PCI Domain! domain=%d\n", domain);
+ dev_err(&pdev->xdev->dev,
+ "Please compile with CONFIG_PCI_DOMAINS\n");
+ err = -EINVAL;
+ goto err_out;
+ }
+#endif
+
+ dev_info(&pdev->xdev->dev, "Creating PCI Frontend Bus %04x:%02x\n",
+ domain, bus);
+
+ bus_entry = kmalloc(sizeof(*bus_entry), GFP_KERNEL);
+ sd = kmalloc(sizeof(*sd), GFP_KERNEL);
+ if (!bus_entry || !sd) {
+ err = -ENOMEM;
+ goto err_out;
+ }
+ pcifront_init_sd(sd, domain, bus, pdev);
+
+ b = pci_scan_bus_parented(&pdev->xdev->dev, bus,
+ &pcifront_bus_ops, sd);
+ if (!b) {
+ dev_err(&pdev->xdev->dev,
+ "Error creating PCI Frontend Bus!\n");
+ err = -ENOMEM;
+ goto err_out;
+ }
+
+ pcifront_setup_root_resources(b, sd);
+ bus_entry->bus = b;
+
+ list_add(&bus_entry->list, &pdev->root_buses);
+
+ /* Claim resources before going "live" with our devices */
+ pci_walk_bus(b, pcifront_claim_resource, pdev);
+
+ pci_bus_add_devices(b);
+
+ return 0;
+
+ err_out:
+ kfree(bus_entry);
+ kfree(sd);
+
+ return err;
+}
+
+int __devinit pcifront_rescan_root(struct pcifront_device *pdev,
+ unsigned int domain, unsigned int bus)
+{
+ struct pci_bus *b;
+ struct pci_dev *d;
+ unsigned int devfn;
+ int err;
+
+#ifndef CONFIG_PCI_DOMAINS
+ if (domain != 0) {
+ dev_err(&pdev->xdev->dev,
+ "PCI Root in non-zero PCI Domain! domain=%d\n", domain);
+ dev_err(&pdev->xdev->dev,
+ "Please compile with CONFIG_PCI_DOMAINS\n");
+ return -EINVAL;
+ }
+#endif
+
+ dev_info(&pdev->xdev->dev, "Rescanning PCI Frontend Bus %04x:%02x\n",
+ domain, bus);
+
+ b = pci_find_bus(domain, bus);
+ if(!b)
+ /* If the bus is unknown, create it. */
+ return pcifront_scan_root(pdev, domain, bus);
+
+ /* Rescan the bus for newly attached functions and add.
+ * We omit handling of PCI bridge attachment because pciback prevents
+ * bridges from being exported.
+ */
+ for (devfn = 0; devfn < 0x100; devfn++) {
+ d = pci_get_slot(b, devfn);
+ if(d) {
+ /* Device is already known. */
+ pci_dev_put(d);
+ continue;
+ }
+
+ d = pci_scan_single_device(b, devfn);
+ if (d) {
+ dev_info(&pdev->xdev->dev, "New device on "
+ "%04x:%02x:%02x.%02x found.\n", domain, bus,
+ PCI_SLOT(devfn), PCI_FUNC(devfn));
+ err = pci_bus_add_device(d);
+ if (err) {
+ dev_err(&pdev->xdev->dev, "Failed to add "
+ " device to bus.\n");
+ return err;
+ }
+
+ }
+ }
+
+ return 0;
+}
+
+static void free_root_bus_devs(struct pci_bus *bus)
+{
+ struct pci_dev *dev;
+
+ while (!list_empty(&bus->devices)) {
+ dev = container_of(bus->devices.next, struct pci_dev,
+ bus_list);
+ dev_dbg(&dev->dev, "removing device\n");
+ pci_remove_bus_device(dev);
+ }
+}
+
+void pcifront_free_roots(struct pcifront_device *pdev)
+{
+ struct pci_bus_entry *bus_entry, *t;
+
+ dev_dbg(&pdev->xdev->dev, "cleaning up root buses\n");
+
+ list_for_each_entry_safe(bus_entry, t, &pdev->root_buses, list) {
+ list_del(&bus_entry->list);
+
+ free_root_bus_devs(bus_entry->bus);
+
+ kfree(bus_entry->bus->sysdata);
+
+ device_unregister(bus_entry->bus->bridge);
+ pci_remove_bus(bus_entry->bus);
+
+ kfree(bus_entry);
+ }
+}
+
+static pci_ers_result_t pcifront_common_process( int cmd, struct
pcifront_device *pdev,
+ pci_channel_state_t state)
+{
+ pci_ers_result_t result;
+ struct pci_driver *pdrv;
+ int bus = pdev->sh_info->aer_op.bus;
+ int devfn = pdev->sh_info->aer_op.devfn;
+ struct pci_dev *pcidev;
+ int flag = 0;
+
+ dev_dbg(&pdev->xdev->dev,
+ "pcifront AER process: cmd %x (bus:%x, devfn%x)",
+ cmd, bus, devfn);
+ result = PCI_ERS_RESULT_NONE;
+
+ pcidev = pci_get_bus_and_slot(bus, devfn);
+ if (!pcidev || !pcidev->driver){
+ dev_err(&pcidev->dev,
+ "device or driver is NULL\n");
+ return result;
+ }
+ pdrv = pcidev->driver;
+
+ if (get_driver(&pdrv->driver)) {
+ if (pdrv->err_handler && pdrv->err_handler->error_detected) {
+ dev_dbg(&pcidev->dev,
+ "trying to call AER service\n");
+ if (pcidev) {
+ flag = 1;
+ switch(cmd) {
+ case XEN_PCI_OP_aer_detected:
+ result =
pdrv->err_handler->error_detected(pcidev, state);
+ break;
+ case XEN_PCI_OP_aer_mmio:
+ result =
pdrv->err_handler->mmio_enabled(pcidev);
+ break;
+ case XEN_PCI_OP_aer_slotreset:
+ result =
pdrv->err_handler->slot_reset(pcidev);
+ break;
+ case XEN_PCI_OP_aer_resume:
+ pdrv->err_handler->resume(pcidev);
+ break;
+ default:
+ dev_err(&pdev->xdev->dev,
+ "bad request in aer recovery
operation!\n");
+
+ }
+ }
+ }
+ put_driver(&pdrv->driver);
+ }
+ if (!flag)
+ result = PCI_ERS_RESULT_NONE;
+
+ return result;
+}
+
+
+void pcifront_do_aer(struct work_struct *data)
+{
+ struct pcifront_device *pdev = container_of(data, struct
pcifront_device, op_work);
+ int cmd = pdev->sh_info->aer_op.cmd;
+ pci_channel_state_t state =
+ (pci_channel_state_t)pdev->sh_info->aer_op.err;
+
+ /*If a pci_conf op is in progress,
+ we have to wait until it is done before service aer op*/
+ dev_dbg(&pdev->xdev->dev,
+ "pcifront service aer bus %x devfn %x\n",
pdev->sh_info->aer_op.bus,
+ pdev->sh_info->aer_op.devfn);
+
+ pdev->sh_info->aer_op.err = pcifront_common_process(cmd, pdev, state);
+
+ wmb();
+ clear_bit(_XEN_PCIB_active, (unsigned long*)&pdev->sh_info->flags);
+ notify_remote_via_evtchn(pdev->evtchn);
+
+ /*in case of we lost an aer request in four lines time_window*/
+ smp_mb__before_clear_bit();
+ clear_bit( _PDEVB_op_active, &pdev->flags);
+ smp_mb__after_clear_bit();
+
+ schedule_pcifront_aer_op(pdev);
+
+}
+
+irqreturn_t pcifront_handler_aer(int irq, void *dev)
+{
+ struct pcifront_device *pdev = dev;
+ schedule_pcifront_aer_op(pdev);
+ return IRQ_HANDLED;
+}
+int pcifront_connect(struct pcifront_device *pdev)
+{
+ int err = 0;
+
+ spin_lock(&pcifront_dev_lock);
+
+ if (!pcifront_dev) {
+ dev_info(&pdev->xdev->dev, "Installing PCI frontend\n");
+ pcifront_dev = pdev;
+ }
+ else {
+ dev_err(&pdev->xdev->dev, "PCI frontend already installed!\n");
+ err = -EEXIST;
+ }
+
+ spin_unlock(&pcifront_dev_lock);
+
+ return err;
+}
+
+void pcifront_disconnect(struct pcifront_device *pdev)
+{
+ spin_lock(&pcifront_dev_lock);
+
+ if (pdev == pcifront_dev) {
+ dev_info(&pdev->xdev->dev,
+ "Disconnecting PCI Frontend Buses\n");
+ pcifront_dev = NULL;
+ }
+
+ spin_unlock(&pcifront_dev_lock);
+}
+static struct pcifront_device *alloc_pdev(struct xenbus_device *xdev)
+{
+ struct pcifront_device *pdev;
+
+ pdev = kzalloc(sizeof(struct pcifront_device), GFP_KERNEL);
+ if (pdev == NULL)
+ goto out;
+
+ pdev->sh_info =
+ (struct xen_pci_sharedinfo *)__get_free_page(GFP_KERNEL);
+ if (pdev->sh_info == NULL) {
+ kfree(pdev);
+ pdev = NULL;
+ goto out;
+ }
+ pdev->sh_info->flags = 0;
+
+ /*Flag for registering PV AER handler*/
+ set_bit(_XEN_PCIB_AERHANDLER, (void*)&pdev->sh_info->flags);
+
+ xdev->dev.driver_data = pdev;
+ pdev->xdev = xdev;
+
+ INIT_LIST_HEAD(&pdev->root_buses);
+
+ spin_lock_init(&pdev->dev_lock);
+ spin_lock_init(&pdev->sh_info_lock);
+
+ pdev->evtchn = INVALID_EVTCHN;
+ pdev->gnt_ref = INVALID_GRANT_REF;
+ pdev->irq = -1;
+
+ INIT_WORK(&pdev->op_work, pcifront_do_aer);
+
+ dev_dbg(&xdev->dev, "Allocated pdev @ 0x%p pdev->sh_info @ 0x%p\n",
+ pdev, pdev->sh_info);
+ out:
+ return pdev;
+}
+
+static void free_pdev(struct pcifront_device *pdev)
+{
+ dev_dbg(&pdev->xdev->dev, "freeing pdev @ 0x%p\n", pdev);
+
+ pcifront_free_roots(pdev);
+
+ /*For PCIE_AER error handling job*/
+ flush_scheduled_work();
+ unbind_from_irqhandler(pdev->irq, pdev);
+
+ if (pdev->evtchn != INVALID_EVTCHN)
+ xenbus_free_evtchn(pdev->xdev, pdev->evtchn);
+
+ if (pdev->gnt_ref != INVALID_GRANT_REF)
+ gnttab_end_foreign_access(pdev->gnt_ref, 0 /* r/w page */,
+ (unsigned long)pdev->sh_info);
+
+ pdev->xdev->dev.driver_data = NULL;
+
+ kfree(pdev);
+}
+
+static int pcifront_publish_info(struct pcifront_device *pdev)
+{
+ int err = 0;
+ struct xenbus_transaction trans;
+
+ err = xenbus_grant_ring(pdev->xdev, virt_to_mfn(pdev->sh_info));
+ if (err < 0)
+ goto out;
+
+ pdev->gnt_ref = err;
+
+ err = xenbus_alloc_evtchn(pdev->xdev, &pdev->evtchn);
+ if (err)
+ goto out;
+
+ err = bind_evtchn_to_irqhandler(pdev->evtchn, pcifront_handler_aer,
+ 0, "pcifront", pdev);
+ if (err < 0) {
+ xenbus_free_evtchn(pdev->xdev, pdev->evtchn);
+ xenbus_dev_fatal(pdev->xdev, err, "Failed to bind evtchn to "
+ "irqhandler.\n");
+ return err;
+ }
+ pdev->irq = err;
+
+ do_publish:
+ err = xenbus_transaction_start(&trans);
+ if (err) {
+ xenbus_dev_fatal(pdev->xdev, err,
+ "Error writing configuration for backend "
+ "(start transaction)");
+ goto out;
+ }
+
+ err = xenbus_printf(trans, pdev->xdev->nodename,
+ "pci-op-ref", "%u", pdev->gnt_ref);
+ if (!err)
+ err = xenbus_printf(trans, pdev->xdev->nodename,
+ "event-channel", "%u", pdev->evtchn);
+ if (!err)
+ err = xenbus_printf(trans, pdev->xdev->nodename,
+ "magic", XEN_PCI_MAGIC);
+
+ if (err) {
+ xenbus_transaction_end(trans, 1);
+ xenbus_dev_fatal(pdev->xdev, err,
+ "Error writing configuration for backend");
+ goto out;
+ } else {
+ err = xenbus_transaction_end(trans, 0);
+ if (err == -EAGAIN)
+ goto do_publish;
+ else if (err) {
+ xenbus_dev_fatal(pdev->xdev, err,
+ "Error completing transaction "
+ "for backend");
+ goto out;
+ }
+ }
+
+ xenbus_switch_state(pdev->xdev, XenbusStateInitialised);
+
+ dev_dbg(&pdev->xdev->dev, "publishing successful!\n");
+
+ out:
+ return err;
+}
+
+static int __devinit pcifront_try_connect(struct pcifront_device *pdev)
+{
+ int err = -EFAULT;
+ int i, num_roots, len;
+ char str[64];
+ unsigned int domain, bus;
+
+ spin_lock(&pdev->dev_lock);
+
+ /* Only connect once */
+ if (xenbus_read_driver_state(pdev->xdev->nodename) !=
+ XenbusStateInitialised)
+ goto out;
+
+ err = pcifront_connect(pdev);
+ if (err) {
+ xenbus_dev_fatal(pdev->xdev, err,
+ "Error connecting PCI Frontend");
+ goto out;
+ }
+
+ err = xenbus_scanf(XBT_NIL, pdev->xdev->otherend,
+ "root_num", "%d", &num_roots);
+ if (err == -ENOENT) {
+ xenbus_dev_error(pdev->xdev, err,
+ "No PCI Roots found, trying 0000:00");
+ err = pcifront_scan_root(pdev, 0, 0);
+ num_roots = 0;
+ } else if (err != 1) {
+ if (err == 0)
+ err = -EINVAL;
+ xenbus_dev_fatal(pdev->xdev, err,
+ "Error reading number of PCI roots");
+ goto out;
+ }
+
+ for (i = 0; i < num_roots; i++) {
+ len = snprintf(str, sizeof(str), "root-%d", i);
+ if (unlikely(len >= (sizeof(str) - 1))) {
+ err = -ENOMEM;
+ goto out;
+ }
+
+ err = xenbus_scanf(XBT_NIL, pdev->xdev->otherend, str,
+ "%x:%x", &domain, &bus);
+ if (err != 2) {
+ if (err >= 0)
+ err = -EINVAL;
+ xenbus_dev_fatal(pdev->xdev, err,
+ "Error reading PCI root %d", i);
+ goto out;
+ }
+
+ err = pcifront_scan_root(pdev, domain, bus);
+ if (err) {
+ xenbus_dev_fatal(pdev->xdev, err,
+ "Error scanning PCI root %04x:%02x",
+ domain, bus);
+ goto out;
+ }
+ }
+
+ err = xenbus_switch_state(pdev->xdev, XenbusStateConnected);
+ if (err)
+ goto out;
+
+ out:
+ spin_unlock(&pdev->dev_lock);
+ return err;
+}
+
+static int pcifront_try_disconnect(struct pcifront_device *pdev)
+{
+ int err = 0;
+ enum xenbus_state prev_state;
+
+ spin_lock(&pdev->dev_lock);
+
+ prev_state = xenbus_read_driver_state(pdev->xdev->nodename);
+
+ if (prev_state >= XenbusStateClosing)
+ goto out;
+
+ if(prev_state == XenbusStateConnected) {
+ pcifront_free_roots(pdev);
+ pcifront_disconnect(pdev);
+ }
+
+ err = xenbus_switch_state(pdev->xdev, XenbusStateClosed);
+
+ out:
+ spin_unlock(&pdev->dev_lock);
+
+ return err;
+}
+
+static int __devinit pcifront_attach_devices(struct pcifront_device *pdev)
+{
+ int err = -EFAULT;
+ int i, num_roots, len;
+ unsigned int domain, bus;
+ char str[64];
+
+ spin_lock(&pdev->dev_lock);
+
+ if (xenbus_read_driver_state(pdev->xdev->nodename) !=
+ XenbusStateReconfiguring)
+ goto out;
+
+ err = xenbus_scanf(XBT_NIL, pdev->xdev->otherend,
+ "root_num", "%d", &num_roots);
+ if (err == -ENOENT) {
+ xenbus_dev_error(pdev->xdev, err,
+ "No PCI Roots found, trying 0000:00");
+ err = pcifront_rescan_root(pdev, 0, 0);
+ num_roots = 0;
+ } else if (err != 1) {
+ if (err == 0)
+ err = -EINVAL;
+ xenbus_dev_fatal(pdev->xdev, err,
+ "Error reading number of PCI roots");
+ goto out;
+ }
+
+ for (i = 0; i < num_roots; i++) {
+ len = snprintf(str, sizeof(str), "root-%d", i);
+ if (unlikely(len >= (sizeof(str) - 1))) {
+ err = -ENOMEM;
+ goto out;
+ }
+
+ err = xenbus_scanf(XBT_NIL, pdev->xdev->otherend, str,
+ "%x:%x", &domain, &bus);
+ if (err != 2) {
+ if (err >= 0)
+ err = -EINVAL;
+ xenbus_dev_fatal(pdev->xdev, err,
+ "Error reading PCI root %d", i);
+ goto out;
+ }
+
+ err = pcifront_rescan_root(pdev, domain, bus);
+ if (err) {
+ xenbus_dev_fatal(pdev->xdev, err,
+ "Error scanning PCI root %04x:%02x",
+ domain, bus);
+ goto out;
+ }
+ }
+
+ xenbus_switch_state(pdev->xdev, XenbusStateConnected);
+
+ out:
+ spin_unlock(&pdev->dev_lock);
+ return err;
+}
+
+static int pcifront_detach_devices(struct pcifront_device *pdev)
+{
+ int err = 0;
+ int i, num_devs;
+ unsigned int domain, bus, slot, func;
+ struct pci_bus *pci_bus;
+ struct pci_dev *pci_dev;
+ char str[64];
+
+ spin_lock(&pdev->dev_lock);
+
+ if (xenbus_read_driver_state(pdev->xdev->nodename) !=
+ XenbusStateConnected)
+ goto out;
+
+ err = xenbus_scanf(XBT_NIL, pdev->xdev->otherend, "num_devs", "%d",
+ &num_devs);
+ if (err != 1) {
+ if (err >= 0)
+ err = -EINVAL;
+ xenbus_dev_fatal(pdev->xdev, err,
+ "Error reading number of PCI devices");
+ goto out;
+ }
+
+ /* Find devices being detached and remove them. */
+ for (i = 0; i < num_devs; i++) {
+ int l, state;
+ l = snprintf(str, sizeof(str), "state-%d", i);
+ if (unlikely(l >= (sizeof(str) - 1))) {
+ err = -ENOMEM;
+ goto out;
+ }
+ err = xenbus_scanf(XBT_NIL, pdev->xdev->otherend, str, "%d",
+ &state);
+ if (err != 1)
+ state = XenbusStateUnknown;
+
+ if (state != XenbusStateClosing)
+ continue;
+
+ /* Remove device. */
+ l = snprintf(str, sizeof(str), "vdev-%d", i);
+ if (unlikely(l >= (sizeof(str) - 1))) {
+ err = -ENOMEM;
+ goto out;
+ }
+ err = xenbus_scanf(XBT_NIL, pdev->xdev->otherend, str,
+ "%x:%x:%x.%x", &domain, &bus, &slot, &func);
+ if (err != 4) {
+ if (err >= 0)
+ err = -EINVAL;
+ xenbus_dev_fatal(pdev->xdev, err,
+ "Error reading PCI device %d", i);
+ goto out;
+ }
+
+ pci_bus = pci_find_bus(domain, bus);
+ if(!pci_bus) {
+ dev_dbg(&pdev->xdev->dev, "Cannot get bus %04x:%02x\n",
+ domain, bus);
+ continue;
+ }
+ pci_dev = pci_get_slot(pci_bus, PCI_DEVFN(slot, func));
+ if(!pci_dev) {
+ dev_dbg(&pdev->xdev->dev,
+ "Cannot get PCI device %04x:%02x:%02x.%02x\n",
+ domain, bus, slot, func);
+ continue;
+ }
+ pci_remove_bus_device(pci_dev);
+ pci_dev_put(pci_dev);
+
+ dev_dbg(&pdev->xdev->dev,
+ "PCI device %04x:%02x:%02x.%02x removed.\n",
+ domain, bus, slot, func);
+ }
+
+ err = xenbus_switch_state(pdev->xdev, XenbusStateReconfiguring);
+
+ out:
+ spin_unlock(&pdev->dev_lock);
+ return err;
+}
+
+static void __init_refok pcifront_backend_changed(struct xenbus_device *xdev,
+ enum xenbus_state be_state)
+{
+ struct pcifront_device *pdev = xdev->dev.driver_data;
+
+ switch (be_state) {
+ case XenbusStateUnknown:
+ case XenbusStateInitialising:
+ case XenbusStateInitWait:
+ case XenbusStateInitialised:
+ case XenbusStateClosed:
+ break;
+
+ case XenbusStateConnected:
+ pcifront_try_connect(pdev);
+ break;
+
+ case XenbusStateClosing:
+ dev_warn(&xdev->dev, "backend going away!\n");
+ pcifront_try_disconnect(pdev);
+ break;
+
+ case XenbusStateReconfiguring:
+ pcifront_detach_devices(pdev);
+ break;
+
+ case XenbusStateReconfigured:
+ pcifront_attach_devices(pdev);
+ break;
+ }
+}
+
+static int pcifront_xenbus_probe(struct xenbus_device *xdev,
+ const struct xenbus_device_id *id)
+{
+ int err = 0;
+ struct pcifront_device *pdev = alloc_pdev(xdev);
+
+ if (pdev == NULL) {
+ err = -ENOMEM;
+ xenbus_dev_fatal(xdev, err,
+ "Error allocating pcifront_device struct");
+ goto out;
+ }
+
+ err = pcifront_publish_info(pdev);
+
+ out:
+ return err;
+}
+
+static int pcifront_xenbus_remove(struct xenbus_device *xdev)
+{
+ if (xdev->dev.driver_data)
+ free_pdev(xdev->dev.driver_data);
+
+ return 0;
+}
+
+static const struct xenbus_device_id xenpci_ids[] = {
+ {"pci"},
+ {{0}},
+};
+MODULE_ALIAS("xen:pci");
+
+static struct xenbus_driver xenbus_pcifront_driver = {
+ .name = "pcifront",
+ .owner = THIS_MODULE,
+ .ids = xenpci_ids,
+ .probe = pcifront_xenbus_probe,
+ .remove = pcifront_xenbus_remove,
+ .otherend_changed = pcifront_backend_changed,
+};
+
+static int __init pcifront_init(void)
+{
+ if (!xen_domain())
+ return -ENODEV;
+
+ return xenbus_register_frontend(&xenbus_pcifront_driver);
+}
+
+/* Initialize after the Xen PCI Frontend Stub is initialized */
+subsys_initcall(pcifront_init);
diff --git a/drivers/xen/Kconfig b/drivers/xen/Kconfig
index d4a33b6..88eb94c 100644
--- a/drivers/xen/Kconfig
+++ b/drivers/xen/Kconfig
@@ -174,20 +174,3 @@ config ACPI_PROCESSOR_XEN
depends on XEN_DOM0 && ACPI_PROCESSOR && CPU_FREQ
default y
-config XEN_PCIDEV_FRONTEND
- bool "Xen PCI Frontend"
- depends on PCI && X86_64
- select HOTPLUG
- default y
- help
- The PCI device frontend driver allows the kernel to import arbitrary
- PCI devices from a PCI backend to support PCI driver domains.
-
-config XEN_PCIDEV_FE_DEBUG
- bool "Xen PCI Frontend Debugging"
- depends on XEN_PCIDEV_FRONTEND
- default n
- help
- Enables some debug statements within the PCI Frontend.
-
-
diff --git a/drivers/xen/Makefile b/drivers/xen/Makefile
index 0bba5f2..cddfffb 100644
--- a/drivers/xen/Makefile
+++ b/drivers/xen/Makefile
@@ -13,7 +13,6 @@ obj-$(CONFIG_XEN_GNTDEV) += gntdev.o
obj-$(CONFIG_XEN_BLKDEV_BACKEND) += blkback/
obj-$(CONFIG_XEN_NETDEV_BACKEND) += netback/
obj-$(CONFIG_XEN_PCIDEV_BACKEND) += pciback/
-obj-$(CONFIG_XEN_PCIDEV_FRONTEND) += pcifront/
obj-$(CONFIG_XENFS) += xenfs/
obj-$(CONFIG_XEN_SYS_HYPERVISOR) += sys-hypervisor.o
obj-$(CONFIG_XEN_S3) += acpi.o
diff --git a/drivers/xen/pcifront/Makefile b/drivers/xen/pcifront/Makefile
deleted file mode 100644
index d49136e..0000000
--- a/drivers/xen/pcifront/Makefile
+++ /dev/null
@@ -1,7 +0,0 @@
-obj-y += pcifront.o
-
-pcifront-y := xenbus.o
-
-ifeq ($(CONFIG_XEN_PCIDEV_FE_DEBUG),y)
-EXTRA_CFLAGS += -DDEBUG
-endif
diff --git a/drivers/xen/pcifront/xenbus.c b/drivers/xen/pcifront/xenbus.c
deleted file mode 100644
index 854850d..0000000
--- a/drivers/xen/pcifront/xenbus.c
+++ /dev/null
@@ -1,1117 +0,0 @@
-/*
- * PCI Frontend Xenbus Setup - handles setup with backend (imports page/evtchn)
- *
- * Author: Ryan Wilson <hap9@xxxxxxxxxxxxxx>
- */
-#include <linux/module.h>
-#include <linux/init.h>
-#include <linux/mm.h>
-#include <xen/xenbus.h>
-#include <xen/events.h>
-#include <xen/grant_table.h>
-#include <xen/page.h>
-#include <linux/spinlock.h>
-#include <linux/pci.h>
-#include <xen/xenbus.h>
-#include <xen/interface/io/pciif.h>
-#include <linux/interrupt.h>
-#include <asm/atomic.h>
-#include <linux/workqueue.h>
-#include <asm/bitops.h>
-#include <linux/time.h>
-
-
-#ifndef __init_refok
-#define __init_refok
-#endif
-
-#define INVALID_GRANT_REF (0)
-#define INVALID_EVTCHN (-1)
-
-
-struct pci_bus_entry {
- struct list_head list;
- struct pci_bus *bus;
-};
-
-#define _PDEVB_op_active (0)
-#define PDEVB_op_active (1 << (_PDEVB_op_active))
-
-struct pcifront_device {
- struct xenbus_device *xdev;
- struct list_head root_buses;
- spinlock_t dev_lock;
-
- int evtchn;
- int gnt_ref;
-
- int irq;
-
- /* Lock this when doing any operations in sh_info */
- spinlock_t sh_info_lock;
- struct xen_pci_sharedinfo *sh_info;
- struct work_struct op_work;
- unsigned long flags;
-
-};
-
-struct pcifront_sd {
- int domain;
- struct pcifront_device *pdev;
-};
-
-static inline struct pcifront_device *
-pcifront_get_pdev(struct pcifront_sd *sd)
-{
- return sd->pdev;
-}
-
-static inline void pcifront_init_sd(struct pcifront_sd *sd,
- unsigned int domain, unsigned int bus,
- struct pcifront_device *pdev)
-{
- sd->domain = domain;
- sd->pdev = pdev;
-}
-
-static inline void pcifront_setup_root_resources(struct pci_bus *bus,
- struct pcifront_sd *sd)
-{
-}
-
-
-DEFINE_SPINLOCK(pcifront_dev_lock);
-static struct pcifront_device *pcifront_dev = NULL;
-
-static int verbose_request = 0;
-module_param(verbose_request, int, 0644);
-
-static int errno_to_pcibios_err(int errno)
-{
- switch (errno) {
- case XEN_PCI_ERR_success:
- return PCIBIOS_SUCCESSFUL;
-
- case XEN_PCI_ERR_dev_not_found:
- return PCIBIOS_DEVICE_NOT_FOUND;
-
- case XEN_PCI_ERR_invalid_offset:
- case XEN_PCI_ERR_op_failed:
- return PCIBIOS_BAD_REGISTER_NUMBER;
-
- case XEN_PCI_ERR_not_implemented:
- return PCIBIOS_FUNC_NOT_SUPPORTED;
-
- case XEN_PCI_ERR_access_denied:
- return PCIBIOS_SET_FAILED;
- }
- return errno;
-}
-
-static inline void schedule_pcifront_aer_op(struct pcifront_device *pdev)
-{
- if (test_bit(_XEN_PCIB_active, (unsigned long *)&pdev->sh_info->flags)
- && !test_and_set_bit(_PDEVB_op_active, &pdev->flags)) {
- dev_dbg(&pdev->xdev->dev, "schedule aer frontend job\n");
- schedule_work(&pdev->op_work);
- }
-}
-
-static int do_pci_op(struct pcifront_device *pdev, struct xen_pci_op *op)
-{
- int err = 0;
- struct xen_pci_op *active_op = &pdev->sh_info->op;
- unsigned long irq_flags;
- evtchn_port_t port = pdev->evtchn;
- unsigned irq = pdev->irq;
- s64 ns, ns_timeout;
- struct timeval tv;
-
- spin_lock_irqsave(&pdev->sh_info_lock, irq_flags);
-
- memcpy(active_op, op, sizeof(struct xen_pci_op));
-
- /* Go */
- wmb();
- set_bit(_XEN_PCIF_active, (unsigned long *)&pdev->sh_info->flags);
- notify_remote_via_evtchn(port);
-
- /*
- * We set a poll timeout of 3 seconds but give up on return after
- * 2 seconds. It is better to time out too late rather than too early
- * (in the latter case we end up continually re-executing poll() with a
- * timeout in the past). 1s difference gives plenty of slack for error.
- */
- do_gettimeofday(&tv);
- ns_timeout = timeval_to_ns(&tv) + 2 * (s64)NSEC_PER_SEC;
-
- xen_clear_irq_pending(irq);
-
- while (test_bit(_XEN_PCIF_active,
- (unsigned long *)&pdev->sh_info->flags)) {
- xen_poll_irq_timeout(irq, jiffies + 3*HZ);
- xen_clear_irq_pending(irq);
- do_gettimeofday(&tv);
- ns = timeval_to_ns(&tv);
- if (ns > ns_timeout) {
- dev_err(&pdev->xdev->dev,
- "pciback not responding!!!\n");
- clear_bit(_XEN_PCIF_active,
- (unsigned long *)&pdev->sh_info->flags);
- err = XEN_PCI_ERR_dev_not_found;
- goto out;
- }
- }
-
- /*
- * We might lose backend service request since we
- * reuse same evtchn with pci_conf backend response. So re-schedule
- * aer pcifront service.
- */
- if (test_bit(_XEN_PCIB_active,
- (unsigned long*)&pdev->sh_info->flags)) {
- dev_err(&pdev->xdev->dev,
- "schedule aer pcifront service\n");
- schedule_pcifront_aer_op(pdev);
- }
-
- memcpy(op, active_op, sizeof(struct xen_pci_op));
-
- err = op->err;
- out:
- spin_unlock_irqrestore(&pdev->sh_info_lock, irq_flags);
- return err;
-}
-
-/* Access to this function is spinlocked in drivers/pci/access.c */
-static int pcifront_bus_read(struct pci_bus *bus, unsigned int devfn,
- int where, int size, u32 * val)
-{
- int err = 0;
- struct xen_pci_op op = {
- .cmd = XEN_PCI_OP_conf_read,
- .domain = pci_domain_nr(bus),
- .bus = bus->number,
- .devfn = devfn,
- .offset = where,
- .size = size,
- };
- struct pcifront_sd *sd = bus->sysdata;
- struct pcifront_device *pdev = pcifront_get_pdev(sd);
-
- if (verbose_request)
- dev_info(&pdev->xdev->dev,
- "read dev=%04x:%02x:%02x.%01x - offset %x size %d\n",
- pci_domain_nr(bus), bus->number, PCI_SLOT(devfn),
- PCI_FUNC(devfn), where, size);
-
- err = do_pci_op(pdev, &op);
-
- if (likely(!err)) {
- if (verbose_request)
- dev_info(&pdev->xdev->dev, "read got back value %x\n",
- op.value);
-
- *val = op.value;
- } else if (err == -ENODEV) {
- /* No device here, pretend that it just returned 0 */
- err = 0;
- *val = 0;
- }
-
- return errno_to_pcibios_err(err);
-}
-
-/* Access to this function is spinlocked in drivers/pci/access.c */
-static int pcifront_bus_write(struct pci_bus *bus, unsigned int devfn,
- int where, int size, u32 val)
-{
- struct xen_pci_op op = {
- .cmd = XEN_PCI_OP_conf_write,
- .domain = pci_domain_nr(bus),
- .bus = bus->number,
- .devfn = devfn,
- .offset = where,
- .size = size,
- .value = val,
- };
- struct pcifront_sd *sd = bus->sysdata;
- struct pcifront_device *pdev = pcifront_get_pdev(sd);
-
- if (verbose_request)
- dev_info(&pdev->xdev->dev,
- "write dev=%04x:%02x:%02x.%01x - "
- "offset %x size %d val %x\n",
- pci_domain_nr(bus), bus->number,
- PCI_SLOT(devfn), PCI_FUNC(devfn), where, size, val);
-
- return errno_to_pcibios_err(do_pci_op(pdev, &op));
-}
-
-struct pci_ops pcifront_bus_ops = {
- .read = pcifront_bus_read,
- .write = pcifront_bus_write,
-};
-
-#ifdef CONFIG_PCI_MSI
-int pci_frontend_enable_msix(struct pci_dev *dev,
- struct msix_entry *entries,
- int nvec)
-{
- int err;
- int i;
- struct xen_pci_op op = {
- .cmd = XEN_PCI_OP_enable_msix,
- .domain = pci_domain_nr(dev->bus),
- .bus = dev->bus->number,
- .devfn = dev->devfn,
- .value = nvec,
- };
- struct pcifront_sd *sd = dev->bus->sysdata;
- struct pcifront_device *pdev = pcifront_get_pdev(sd);
-
- if (nvec > SH_INFO_MAX_VEC) {
- printk("too much vector for pci frontend%x\n", nvec);
- return -EINVAL;
- }
-
- for (i = 0; i < nvec; i++) {
- op.msix_entries[i].entry = entries[i].entry;
- op.msix_entries[i].vector = entries[i].vector;
- }
-
- err = do_pci_op(pdev, &op);
-
- if (!err) {
- if (!op.value) {
- /* we get the result */
- for ( i = 0; i < nvec; i++)
- entries[i].vector = op.msix_entries[i].vector;
- return 0;
- }
- else {
- printk("enable msix get value %x\n", op.value);
- return op.value;
- }
- }
- else {
- printk("enable msix get err %x\n", err);
- return err;
- }
-}
-
-void pci_frontend_disable_msix(struct pci_dev* dev)
-{
- int err;
- struct xen_pci_op op = {
- .cmd = XEN_PCI_OP_disable_msix,
- .domain = pci_domain_nr(dev->bus),
- .bus = dev->bus->number,
- .devfn = dev->devfn,
- };
- struct pcifront_sd *sd = dev->bus->sysdata;
- struct pcifront_device *pdev = pcifront_get_pdev(sd);
-
- err = do_pci_op(pdev, &op);
-
- /* What should do for error ? */
- if (err)
- printk("pci_disable_msix get err %x\n", err);
-}
-
-int pci_frontend_enable_msi(struct pci_dev *dev)
-{
- int err;
- struct xen_pci_op op = {
- .cmd = XEN_PCI_OP_enable_msi,
- .domain = pci_domain_nr(dev->bus),
- .bus = dev->bus->number,
- .devfn = dev->devfn,
- };
- struct pcifront_sd *sd = dev->bus->sysdata;
- struct pcifront_device *pdev = pcifront_get_pdev(sd);
-
- err = do_pci_op(pdev, &op);
- if (likely(!err)) {
- dev->irq = op.value;
- }
- else {
- printk("pci frontend enable msi failed for dev %x:%x \n",
- op.bus, op.devfn);
- err = -EINVAL;
- }
- return err;
-}
-
-void pci_frontend_disable_msi(struct pci_dev* dev)
-{
- int err;
- struct xen_pci_op op = {
- .cmd = XEN_PCI_OP_disable_msi,
- .domain = pci_domain_nr(dev->bus),
- .bus = dev->bus->number,
- .devfn = dev->devfn,
- };
- struct pcifront_sd *sd = dev->bus->sysdata;
- struct pcifront_device *pdev = pcifront_get_pdev(sd);
-
- err = do_pci_op(pdev, &op);
- if (err == XEN_PCI_ERR_dev_not_found) {
- /* XXX No response from backend, what shall we do? */
- printk("get no response from backend for disable MSI\n");
- return;
- }
- if (likely(!err))
- dev->irq = op.value;
- else
- /* how can pciback notify us fail? */
- printk("get fake response frombackend \n");
-}
-#endif /* CONFIG_PCI_MSI */
-
-/* Claim resources for the PCI frontend as-is, backend won't allow changes */
-static int pcifront_claim_resource(struct pci_dev *dev, void *data)
-{
- struct pcifront_device *pdev = data;
- int i;
- struct resource *r;
-
- for (i = 0; i < PCI_NUM_RESOURCES; i++) {
- r = &dev->resource[i];
-
- if (!r->parent && r->start && r->flags) {
- dev_dbg(&pdev->xdev->dev, "claiming resource %s/%d\n",
- pci_name(dev), i);
- pci_claim_resource(dev, i);
- }
- }
-
- return 0;
-}
-
-int __devinit pcifront_scan_root(struct pcifront_device *pdev,
- unsigned int domain, unsigned int bus)
-{
- struct pci_bus *b;
- struct pcifront_sd *sd = NULL;
- struct pci_bus_entry *bus_entry = NULL;
- int err = 0;
-
-#ifndef CONFIG_PCI_DOMAINS
- if (domain != 0) {
- dev_err(&pdev->xdev->dev,
- "PCI Root in non-zero PCI Domain! domain=%d\n", domain);
- dev_err(&pdev->xdev->dev,
- "Please compile with CONFIG_PCI_DOMAINS\n");
- err = -EINVAL;
- goto err_out;
- }
-#endif
-
- dev_info(&pdev->xdev->dev, "Creating PCI Frontend Bus %04x:%02x\n",
- domain, bus);
-
- bus_entry = kmalloc(sizeof(*bus_entry), GFP_KERNEL);
- sd = kmalloc(sizeof(*sd), GFP_KERNEL);
- if (!bus_entry || !sd) {
- err = -ENOMEM;
- goto err_out;
- }
- pcifront_init_sd(sd, domain, bus, pdev);
-
- b = pci_scan_bus_parented(&pdev->xdev->dev, bus,
- &pcifront_bus_ops, sd);
- if (!b) {
- dev_err(&pdev->xdev->dev,
- "Error creating PCI Frontend Bus!\n");
- err = -ENOMEM;
- goto err_out;
- }
-
- pcifront_setup_root_resources(b, sd);
- bus_entry->bus = b;
-
- list_add(&bus_entry->list, &pdev->root_buses);
-
- /* Claim resources before going "live" with our devices */
- pci_walk_bus(b, pcifront_claim_resource, pdev);
-
- pci_bus_add_devices(b);
-
- return 0;
-
- err_out:
- kfree(bus_entry);
- kfree(sd);
-
- return err;
-}
-
-int __devinit pcifront_rescan_root(struct pcifront_device *pdev,
- unsigned int domain, unsigned int bus)
-{
- struct pci_bus *b;
- struct pci_dev *d;
- unsigned int devfn;
- int err;
-
-#ifndef CONFIG_PCI_DOMAINS
- if (domain != 0) {
- dev_err(&pdev->xdev->dev,
- "PCI Root in non-zero PCI Domain! domain=%d\n", domain);
- dev_err(&pdev->xdev->dev,
- "Please compile with CONFIG_PCI_DOMAINS\n");
- return -EINVAL;
- }
-#endif
-
- dev_info(&pdev->xdev->dev, "Rescanning PCI Frontend Bus %04x:%02x\n",
- domain, bus);
-
- b = pci_find_bus(domain, bus);
- if(!b)
- /* If the bus is unknown, create it. */
- return pcifront_scan_root(pdev, domain, bus);
-
- /* Rescan the bus for newly attached functions and add.
- * We omit handling of PCI bridge attachment because pciback prevents
- * bridges from being exported.
- */
- for (devfn = 0; devfn < 0x100; devfn++) {
- d = pci_get_slot(b, devfn);
- if(d) {
- /* Device is already known. */
- pci_dev_put(d);
- continue;
- }
-
- d = pci_scan_single_device(b, devfn);
- if (d) {
- dev_info(&pdev->xdev->dev, "New device on "
- "%04x:%02x:%02x.%02x found.\n", domain, bus,
- PCI_SLOT(devfn), PCI_FUNC(devfn));
- err = pci_bus_add_device(d);
- if (err) {
- dev_err(&pdev->xdev->dev, "Failed to add "
- " device to bus.\n");
- return err;
- }
-
- }
- }
-
- return 0;
-}
-
-static void free_root_bus_devs(struct pci_bus *bus)
-{
- struct pci_dev *dev;
-
- while (!list_empty(&bus->devices)) {
- dev = container_of(bus->devices.next, struct pci_dev,
- bus_list);
- dev_dbg(&dev->dev, "removing device\n");
- pci_remove_bus_device(dev);
- }
-}
-
-void pcifront_free_roots(struct pcifront_device *pdev)
-{
- struct pci_bus_entry *bus_entry, *t;
-
- dev_dbg(&pdev->xdev->dev, "cleaning up root buses\n");
-
- list_for_each_entry_safe(bus_entry, t, &pdev->root_buses, list) {
- list_del(&bus_entry->list);
-
- free_root_bus_devs(bus_entry->bus);
-
- kfree(bus_entry->bus->sysdata);
-
- device_unregister(bus_entry->bus->bridge);
- pci_remove_bus(bus_entry->bus);
-
- kfree(bus_entry);
- }
-}
-
-static pci_ers_result_t pcifront_common_process( int cmd, struct
pcifront_device *pdev,
- pci_channel_state_t state)
-{
- pci_ers_result_t result;
- struct pci_driver *pdrv;
- int bus = pdev->sh_info->aer_op.bus;
- int devfn = pdev->sh_info->aer_op.devfn;
- struct pci_dev *pcidev;
- int flag = 0;
-
- dev_dbg(&pdev->xdev->dev,
- "pcifront AER process: cmd %x (bus:%x, devfn%x)",
- cmd, bus, devfn);
- result = PCI_ERS_RESULT_NONE;
-
- pcidev = pci_get_bus_and_slot(bus, devfn);
- if (!pcidev || !pcidev->driver){
- dev_err(&pcidev->dev,
- "device or driver is NULL\n");
- return result;
- }
- pdrv = pcidev->driver;
-
- if (get_driver(&pdrv->driver)) {
- if (pdrv->err_handler && pdrv->err_handler->error_detected) {
- dev_dbg(&pcidev->dev,
- "trying to call AER service\n");
- if (pcidev) {
- flag = 1;
- switch(cmd) {
- case XEN_PCI_OP_aer_detected:
- result =
pdrv->err_handler->error_detected(pcidev, state);
- break;
- case XEN_PCI_OP_aer_mmio:
- result =
pdrv->err_handler->mmio_enabled(pcidev);
- break;
- case XEN_PCI_OP_aer_slotreset:
- result =
pdrv->err_handler->slot_reset(pcidev);
- break;
- case XEN_PCI_OP_aer_resume:
- pdrv->err_handler->resume(pcidev);
- break;
- default:
- dev_err(&pdev->xdev->dev,
- "bad request in aer recovery
operation!\n");
-
- }
- }
- }
- put_driver(&pdrv->driver);
- }
- if (!flag)
- result = PCI_ERS_RESULT_NONE;
-
- return result;
-}
-
-
-void pcifront_do_aer(struct work_struct *data)
-{
- struct pcifront_device *pdev = container_of(data, struct
pcifront_device, op_work);
- int cmd = pdev->sh_info->aer_op.cmd;
- pci_channel_state_t state =
- (pci_channel_state_t)pdev->sh_info->aer_op.err;
-
- /*If a pci_conf op is in progress,
- we have to wait until it is done before service aer op*/
- dev_dbg(&pdev->xdev->dev,
- "pcifront service aer bus %x devfn %x\n",
pdev->sh_info->aer_op.bus,
- pdev->sh_info->aer_op.devfn);
-
- pdev->sh_info->aer_op.err = pcifront_common_process(cmd, pdev, state);
-
- wmb();
- clear_bit(_XEN_PCIB_active, (unsigned long*)&pdev->sh_info->flags);
- notify_remote_via_evtchn(pdev->evtchn);
-
- /*in case of we lost an aer request in four lines time_window*/
- smp_mb__before_clear_bit();
- clear_bit( _PDEVB_op_active, &pdev->flags);
- smp_mb__after_clear_bit();
-
- schedule_pcifront_aer_op(pdev);
-
-}
-
-irqreturn_t pcifront_handler_aer(int irq, void *dev)
-{
- struct pcifront_device *pdev = dev;
- schedule_pcifront_aer_op(pdev);
- return IRQ_HANDLED;
-}
-int pcifront_connect(struct pcifront_device *pdev)
-{
- int err = 0;
-
- spin_lock(&pcifront_dev_lock);
-
- if (!pcifront_dev) {
- dev_info(&pdev->xdev->dev, "Installing PCI frontend\n");
- pcifront_dev = pdev;
- }
- else {
- dev_err(&pdev->xdev->dev, "PCI frontend already installed!\n");
- err = -EEXIST;
- }
-
- spin_unlock(&pcifront_dev_lock);
-
- return err;
-}
-
-void pcifront_disconnect(struct pcifront_device *pdev)
-{
- spin_lock(&pcifront_dev_lock);
-
- if (pdev == pcifront_dev) {
- dev_info(&pdev->xdev->dev,
- "Disconnecting PCI Frontend Buses\n");
- pcifront_dev = NULL;
- }
-
- spin_unlock(&pcifront_dev_lock);
-}
-static struct pcifront_device *alloc_pdev(struct xenbus_device *xdev)
-{
- struct pcifront_device *pdev;
-
- pdev = kzalloc(sizeof(struct pcifront_device), GFP_KERNEL);
- if (pdev == NULL)
- goto out;
-
- pdev->sh_info =
- (struct xen_pci_sharedinfo *)__get_free_page(GFP_KERNEL);
- if (pdev->sh_info == NULL) {
- kfree(pdev);
- pdev = NULL;
- goto out;
- }
- pdev->sh_info->flags = 0;
-
- /*Flag for registering PV AER handler*/
- set_bit(_XEN_PCIB_AERHANDLER, (void*)&pdev->sh_info->flags);
-
- xdev->dev.driver_data = pdev;
- pdev->xdev = xdev;
-
- INIT_LIST_HEAD(&pdev->root_buses);
-
- spin_lock_init(&pdev->dev_lock);
- spin_lock_init(&pdev->sh_info_lock);
-
- pdev->evtchn = INVALID_EVTCHN;
- pdev->gnt_ref = INVALID_GRANT_REF;
- pdev->irq = -1;
-
- INIT_WORK(&pdev->op_work, pcifront_do_aer);
-
- dev_dbg(&xdev->dev, "Allocated pdev @ 0x%p pdev->sh_info @ 0x%p\n",
- pdev, pdev->sh_info);
- out:
- return pdev;
-}
-
-static void free_pdev(struct pcifront_device *pdev)
-{
- dev_dbg(&pdev->xdev->dev, "freeing pdev @ 0x%p\n", pdev);
-
- pcifront_free_roots(pdev);
-
- /*For PCIE_AER error handling job*/
- flush_scheduled_work();
- unbind_from_irqhandler(pdev->irq, pdev);
-
- if (pdev->evtchn != INVALID_EVTCHN)
- xenbus_free_evtchn(pdev->xdev, pdev->evtchn);
-
- if (pdev->gnt_ref != INVALID_GRANT_REF)
- gnttab_end_foreign_access(pdev->gnt_ref, 0 /* r/w page */,
- (unsigned long)pdev->sh_info);
-
- pdev->xdev->dev.driver_data = NULL;
-
- kfree(pdev);
-}
-
-static int pcifront_publish_info(struct pcifront_device *pdev)
-{
- int err = 0;
- struct xenbus_transaction trans;
-
- err = xenbus_grant_ring(pdev->xdev, virt_to_mfn(pdev->sh_info));
- if (err < 0)
- goto out;
-
- pdev->gnt_ref = err;
-
- err = xenbus_alloc_evtchn(pdev->xdev, &pdev->evtchn);
- if (err)
- goto out;
-
- err = bind_evtchn_to_irqhandler(pdev->evtchn, pcifront_handler_aer,
- 0, "pcifront", pdev);
- if (err < 0) {
- xenbus_free_evtchn(pdev->xdev, pdev->evtchn);
- xenbus_dev_fatal(pdev->xdev, err, "Failed to bind evtchn to "
- "irqhandler.\n");
- return err;
- }
- pdev->irq = err;
-
- do_publish:
- err = xenbus_transaction_start(&trans);
- if (err) {
- xenbus_dev_fatal(pdev->xdev, err,
- "Error writing configuration for backend "
- "(start transaction)");
- goto out;
- }
-
- err = xenbus_printf(trans, pdev->xdev->nodename,
- "pci-op-ref", "%u", pdev->gnt_ref);
- if (!err)
- err = xenbus_printf(trans, pdev->xdev->nodename,
- "event-channel", "%u", pdev->evtchn);
- if (!err)
- err = xenbus_printf(trans, pdev->xdev->nodename,
- "magic", XEN_PCI_MAGIC);
-
- if (err) {
- xenbus_transaction_end(trans, 1);
- xenbus_dev_fatal(pdev->xdev, err,
- "Error writing configuration for backend");
- goto out;
- } else {
- err = xenbus_transaction_end(trans, 0);
- if (err == -EAGAIN)
- goto do_publish;
- else if (err) {
- xenbus_dev_fatal(pdev->xdev, err,
- "Error completing transaction "
- "for backend");
- goto out;
- }
- }
-
- xenbus_switch_state(pdev->xdev, XenbusStateInitialised);
-
- dev_dbg(&pdev->xdev->dev, "publishing successful!\n");
-
- out:
- return err;
-}
-
-static int __devinit pcifront_try_connect(struct pcifront_device *pdev)
-{
- int err = -EFAULT;
- int i, num_roots, len;
- char str[64];
- unsigned int domain, bus;
-
- spin_lock(&pdev->dev_lock);
-
- /* Only connect once */
- if (xenbus_read_driver_state(pdev->xdev->nodename) !=
- XenbusStateInitialised)
- goto out;
-
- err = pcifront_connect(pdev);
- if (err) {
- xenbus_dev_fatal(pdev->xdev, err,
- "Error connecting PCI Frontend");
- goto out;
- }
-
- err = xenbus_scanf(XBT_NIL, pdev->xdev->otherend,
- "root_num", "%d", &num_roots);
- if (err == -ENOENT) {
- xenbus_dev_error(pdev->xdev, err,
- "No PCI Roots found, trying 0000:00");
- err = pcifront_scan_root(pdev, 0, 0);
- num_roots = 0;
- } else if (err != 1) {
- if (err == 0)
- err = -EINVAL;
- xenbus_dev_fatal(pdev->xdev, err,
- "Error reading number of PCI roots");
- goto out;
- }
-
- for (i = 0; i < num_roots; i++) {
- len = snprintf(str, sizeof(str), "root-%d", i);
- if (unlikely(len >= (sizeof(str) - 1))) {
- err = -ENOMEM;
- goto out;
- }
-
- err = xenbus_scanf(XBT_NIL, pdev->xdev->otherend, str,
- "%x:%x", &domain, &bus);
- if (err != 2) {
- if (err >= 0)
- err = -EINVAL;
- xenbus_dev_fatal(pdev->xdev, err,
- "Error reading PCI root %d", i);
- goto out;
- }
-
- err = pcifront_scan_root(pdev, domain, bus);
- if (err) {
- xenbus_dev_fatal(pdev->xdev, err,
- "Error scanning PCI root %04x:%02x",
- domain, bus);
- goto out;
- }
- }
-
- err = xenbus_switch_state(pdev->xdev, XenbusStateConnected);
- if (err)
- goto out;
-
- out:
- spin_unlock(&pdev->dev_lock);
- return err;
-}
-
-static int pcifront_try_disconnect(struct pcifront_device *pdev)
-{
- int err = 0;
- enum xenbus_state prev_state;
-
- spin_lock(&pdev->dev_lock);
-
- prev_state = xenbus_read_driver_state(pdev->xdev->nodename);
-
- if (prev_state >= XenbusStateClosing)
- goto out;
-
- if(prev_state == XenbusStateConnected) {
- pcifront_free_roots(pdev);
- pcifront_disconnect(pdev);
- }
-
- err = xenbus_switch_state(pdev->xdev, XenbusStateClosed);
-
- out:
- spin_unlock(&pdev->dev_lock);
-
- return err;
-}
-
-static int __devinit pcifront_attach_devices(struct pcifront_device *pdev)
-{
- int err = -EFAULT;
- int i, num_roots, len;
- unsigned int domain, bus;
- char str[64];
-
- spin_lock(&pdev->dev_lock);
-
- if (xenbus_read_driver_state(pdev->xdev->nodename) !=
- XenbusStateReconfiguring)
- goto out;
-
- err = xenbus_scanf(XBT_NIL, pdev->xdev->otherend,
- "root_num", "%d", &num_roots);
- if (err == -ENOENT) {
- xenbus_dev_error(pdev->xdev, err,
- "No PCI Roots found, trying 0000:00");
- err = pcifront_rescan_root(pdev, 0, 0);
- num_roots = 0;
- } else if (err != 1) {
- if (err == 0)
- err = -EINVAL;
- xenbus_dev_fatal(pdev->xdev, err,
- "Error reading number of PCI roots");
- goto out;
- }
-
- for (i = 0; i < num_roots; i++) {
- len = snprintf(str, sizeof(str), "root-%d", i);
- if (unlikely(len >= (sizeof(str) - 1))) {
- err = -ENOMEM;
- goto out;
- }
-
- err = xenbus_scanf(XBT_NIL, pdev->xdev->otherend, str,
- "%x:%x", &domain, &bus);
- if (err != 2) {
- if (err >= 0)
- err = -EINVAL;
- xenbus_dev_fatal(pdev->xdev, err,
- "Error reading PCI root %d", i);
- goto out;
- }
-
- err = pcifront_rescan_root(pdev, domain, bus);
- if (err) {
- xenbus_dev_fatal(pdev->xdev, err,
- "Error scanning PCI root %04x:%02x",
- domain, bus);
- goto out;
- }
- }
-
- xenbus_switch_state(pdev->xdev, XenbusStateConnected);
-
- out:
- spin_unlock(&pdev->dev_lock);
- return err;
-}
-
-static int pcifront_detach_devices(struct pcifront_device *pdev)
-{
- int err = 0;
- int i, num_devs;
- unsigned int domain, bus, slot, func;
- struct pci_bus *pci_bus;
- struct pci_dev *pci_dev;
- char str[64];
-
- spin_lock(&pdev->dev_lock);
-
- if (xenbus_read_driver_state(pdev->xdev->nodename) !=
- XenbusStateConnected)
- goto out;
-
- err = xenbus_scanf(XBT_NIL, pdev->xdev->otherend, "num_devs", "%d",
- &num_devs);
- if (err != 1) {
- if (err >= 0)
- err = -EINVAL;
- xenbus_dev_fatal(pdev->xdev, err,
- "Error reading number of PCI devices");
- goto out;
- }
-
- /* Find devices being detached and remove them. */
- for (i = 0; i < num_devs; i++) {
- int l, state;
- l = snprintf(str, sizeof(str), "state-%d", i);
- if (unlikely(l >= (sizeof(str) - 1))) {
- err = -ENOMEM;
- goto out;
- }
- err = xenbus_scanf(XBT_NIL, pdev->xdev->otherend, str, "%d",
- &state);
- if (err != 1)
- state = XenbusStateUnknown;
-
- if (state != XenbusStateClosing)
- continue;
-
- /* Remove device. */
- l = snprintf(str, sizeof(str), "vdev-%d", i);
- if (unlikely(l >= (sizeof(str) - 1))) {
- err = -ENOMEM;
- goto out;
- }
- err = xenbus_scanf(XBT_NIL, pdev->xdev->otherend, str,
- "%x:%x:%x.%x", &domain, &bus, &slot, &func);
- if (err != 4) {
- if (err >= 0)
- err = -EINVAL;
- xenbus_dev_fatal(pdev->xdev, err,
- "Error reading PCI device %d", i);
- goto out;
- }
-
- pci_bus = pci_find_bus(domain, bus);
- if(!pci_bus) {
- dev_dbg(&pdev->xdev->dev, "Cannot get bus %04x:%02x\n",
- domain, bus);
- continue;
- }
- pci_dev = pci_get_slot(pci_bus, PCI_DEVFN(slot, func));
- if(!pci_dev) {
- dev_dbg(&pdev->xdev->dev,
- "Cannot get PCI device %04x:%02x:%02x.%02x\n",
- domain, bus, slot, func);
- continue;
- }
- pci_remove_bus_device(pci_dev);
- pci_dev_put(pci_dev);
-
- dev_dbg(&pdev->xdev->dev,
- "PCI device %04x:%02x:%02x.%02x removed.\n",
- domain, bus, slot, func);
- }
-
- err = xenbus_switch_state(pdev->xdev, XenbusStateReconfiguring);
-
- out:
- spin_unlock(&pdev->dev_lock);
- return err;
-}
-
-static void __init_refok pcifront_backend_changed(struct xenbus_device *xdev,
- enum xenbus_state be_state)
-{
- struct pcifront_device *pdev = xdev->dev.driver_data;
-
- switch (be_state) {
- case XenbusStateUnknown:
- case XenbusStateInitialising:
- case XenbusStateInitWait:
- case XenbusStateInitialised:
- case XenbusStateClosed:
- break;
-
- case XenbusStateConnected:
- pcifront_try_connect(pdev);
- break;
-
- case XenbusStateClosing:
- dev_warn(&xdev->dev, "backend going away!\n");
- pcifront_try_disconnect(pdev);
- break;
-
- case XenbusStateReconfiguring:
- pcifront_detach_devices(pdev);
- break;
-
- case XenbusStateReconfigured:
- pcifront_attach_devices(pdev);
- break;
- }
-}
-
-static int pcifront_xenbus_probe(struct xenbus_device *xdev,
- const struct xenbus_device_id *id)
-{
- int err = 0;
- struct pcifront_device *pdev = alloc_pdev(xdev);
-
- if (pdev == NULL) {
- err = -ENOMEM;
- xenbus_dev_fatal(xdev, err,
- "Error allocating pcifront_device struct");
- goto out;
- }
-
- err = pcifront_publish_info(pdev);
-
- out:
- return err;
-}
-
-static int pcifront_xenbus_remove(struct xenbus_device *xdev)
-{
- if (xdev->dev.driver_data)
- free_pdev(xdev->dev.driver_data);
-
- return 0;
-}
-
-static const struct xenbus_device_id xenpci_ids[] = {
- {"pci"},
- {{0}},
-};
-MODULE_ALIAS("xen:pci");
-
-static struct xenbus_driver xenbus_pcifront_driver = {
- .name = "pcifront",
- .owner = THIS_MODULE,
- .ids = xenpci_ids,
- .probe = pcifront_xenbus_probe,
- .remove = pcifront_xenbus_remove,
- .otherend_changed = pcifront_backend_changed,
-};
-
-static int __init pcifront_init(void)
-{
- if (!xen_domain())
- return -ENODEV;
-
- return xenbus_register_frontend(&xenbus_pcifront_driver);
-}
-
-/* Initialize after the Xen PCI Frontend Stub is initialized */
-subsys_initcall(pcifront_init);
--
1.6.2.5
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