#include <linux/slab.h>
#include <linux/pcieport_if.h>
+#include "../pci.h"
#include "portdrv.h"
-extern int pcie_mch_quirk; /* MSI-quirk Indicator */
-
/**
* release_pcie_device - free PCI Express port service device structure
* @dev: Port service device to release
kfree(to_pcie_device(dev));
}
-static int is_msi_quirked(struct pci_dev *dev)
+/**
+ * pcie_port_msix_add_entry - add entry to given array of MSI-X entries
+ * @entries: Array of MSI-X entries
+ * @new_entry: Index of the entry to add to the array
+ * @nr_entries: Number of entries aleady in the array
+ *
+ * Return value: Position of the added entry in the array
+ */
+static int pcie_port_msix_add_entry(
+ struct msix_entry *entries, int new_entry, int nr_entries)
{
- int port_type, quirk = 0;
+ int j;
+
+ for (j = 0; j < nr_entries; j++)
+ if (entries[j].entry == new_entry)
+ return j;
+
+ entries[j].entry = new_entry;
+ return j;
+}
+
+/**
+ * pcie_port_enable_msix - try to set up MSI-X as interrupt mode for given port
+ * @dev: PCI Express port to handle
+ * @vectors: Array of interrupt vectors to populate
+ * @mask: Bitmask of port capabilities returned by get_port_device_capability()
+ *
+ * Return value: 0 on success, error code on failure
+ */
+static int pcie_port_enable_msix(struct pci_dev *dev, int *vectors, int mask)
+{
+ struct msix_entry *msix_entries;
+ int idx[PCIE_PORT_DEVICE_MAXSERVICES];
+ int nr_entries, status, pos, i, nvec;
u16 reg16;
+ u32 reg32;
- pci_read_config_word(dev,
- pci_find_capability(dev, PCI_CAP_ID_EXP) +
- PCIE_CAPABILITIES_REG, ®16);
- port_type = (reg16 >> 4) & PORT_TYPE_MASK;
- switch(port_type) {
- case PCIE_RC_PORT:
- if (pcie_mch_quirk == 1)
- quirk = 1;
- break;
- case PCIE_SW_UPSTREAM_PORT:
- case PCIE_SW_DOWNSTREAM_PORT:
- default:
- break;
+ nr_entries = pci_msix_table_size(dev);
+ if (!nr_entries)
+ return -EINVAL;
+ if (nr_entries > PCIE_PORT_MAX_MSIX_ENTRIES)
+ nr_entries = PCIE_PORT_MAX_MSIX_ENTRIES;
+
+ msix_entries = kzalloc(sizeof(*msix_entries) * nr_entries, GFP_KERNEL);
+ if (!msix_entries)
+ return -ENOMEM;
+
+ /*
+ * Allocate as many entries as the port wants, so that we can check
+ * which of them will be useful. Moreover, if nr_entries is correctly
+ * equal to the number of entries this port actually uses, we'll happily
+ * go through without any tricks.
+ */
+ for (i = 0; i < nr_entries; i++)
+ msix_entries[i].entry = i;
+
+ status = pci_enable_msix(dev, msix_entries, nr_entries);
+ if (status)
+ goto Exit;
+
+ for (i = 0; i < PCIE_PORT_DEVICE_MAXSERVICES; i++)
+ idx[i] = -1;
+ status = -EIO;
+ nvec = 0;
+
+ if (mask & (PCIE_PORT_SERVICE_PME | PCIE_PORT_SERVICE_HP)) {
+ int entry;
+
+ /*
+ * The code below follows the PCI Express Base Specification 2.0
+ * stating in Section 6.1.6 that "PME and Hot-Plug Event
+ * interrupts (when both are implemented) always share the same
+ * MSI or MSI-X vector, as indicated by the Interrupt Message
+ * Number field in the PCI Express Capabilities register", where
+ * according to Section 7.8.2 of the specification "For MSI-X,
+ * the value in this field indicates which MSI-X Table entry is
+ * used to generate the interrupt message."
+ */
+ pos = pci_find_capability(dev, PCI_CAP_ID_EXP);
+ pci_read_config_word(dev, pos + PCIE_CAPABILITIES_REG, ®16);
+ entry = (reg16 >> 9) & PCIE_PORT_MSI_VECTOR_MASK;
+ if (entry >= nr_entries)
+ goto Error;
+
+ i = pcie_port_msix_add_entry(msix_entries, entry, nvec);
+ if (i == nvec)
+ nvec++;
+
+ idx[PCIE_PORT_SERVICE_PME_SHIFT] = i;
+ idx[PCIE_PORT_SERVICE_HP_SHIFT] = i;
+ }
+
+ if (mask & PCIE_PORT_SERVICE_AER) {
+ int entry;
+
+ /*
+ * The code below follows Section 7.10.10 of the PCI Express
+ * Base Specification 2.0 stating that bits 31-27 of the Root
+ * Error Status Register contain a value indicating which of the
+ * MSI/MSI-X vectors assigned to the port is going to be used
+ * for AER, where "For MSI-X, the value in this register
+ * indicates which MSI-X Table entry is used to generate the
+ * interrupt message."
+ */
+ pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR);
+ pci_read_config_dword(dev, pos + PCI_ERR_ROOT_STATUS, ®32);
+ entry = reg32 >> 27;
+ if (entry >= nr_entries)
+ goto Error;
+
+ i = pcie_port_msix_add_entry(msix_entries, entry, nvec);
+ if (i == nvec)
+ nvec++;
+
+ idx[PCIE_PORT_SERVICE_AER_SHIFT] = i;
}
- return quirk;
+
+ /*
+ * If nvec is equal to the allocated number of entries, we can just use
+ * what we have. Otherwise, the port has some extra entries not for the
+ * services we know and we need to work around that.
+ */
+ if (nvec == nr_entries) {
+ status = 0;
+ } else {
+ /* Drop the temporary MSI-X setup */
+ pci_disable_msix(dev);
+
+ /* Now allocate the MSI-X vectors for real */
+ status = pci_enable_msix(dev, msix_entries, nvec);
+ if (status)
+ goto Exit;
+ }
+
+ for (i = 0; i < PCIE_PORT_DEVICE_MAXSERVICES; i++)
+ vectors[i] = idx[i] >= 0 ? msix_entries[idx[i]].vector : -1;
+
+ Exit:
+ kfree(msix_entries);
+ return status;
+
+ Error:
+ pci_disable_msix(dev);
+ goto Exit;
}
/**
*/
static int assign_interrupt_mode(struct pci_dev *dev, int *vectors, int mask)
{
- int i, pos, nvec, status = -EINVAL;
- int interrupt_mode = PCIE_PORT_INTx_MODE;
+ struct pcie_port_data *port_data = pci_get_drvdata(dev);
+ int irq, interrupt_mode = PCIE_PORT_NO_IRQ;
+ int i;
- /* Set INTx as default */
- for (i = 0, nvec = 0; i < PCIE_PORT_DEVICE_MAXSERVICES; i++) {
- if (mask & (1 << i))
- nvec++;
- vectors[i] = dev->irq;
- }
-
/* Check MSI quirk */
- if (is_msi_quirked(dev))
- return interrupt_mode;
-
- /* Select MSI-X over MSI if supported */
- pos = pci_find_capability(dev, PCI_CAP_ID_MSIX);
- if (pos) {
- struct msix_entry msix_entries[PCIE_PORT_DEVICE_MAXSERVICES] =
- {{0, 0}, {0, 1}, {0, 2}, {0, 3}};
- status = pci_enable_msix(dev, msix_entries, nvec);
- if (!status) {
- int j = 0;
-
- interrupt_mode = PCIE_PORT_MSIX_MODE;
- for (i = 0; i < PCIE_PORT_DEVICE_MAXSERVICES; i++) {
- if (mask & (1 << i))
- vectors[i] = msix_entries[j++].vector;
- }
- }
- }
- if (status) {
- pos = pci_find_capability(dev, PCI_CAP_ID_MSI);
- if (pos) {
- status = pci_enable_msi(dev);
- if (!status) {
- interrupt_mode = PCIE_PORT_MSI_MODE;
- for (i = 0;i < PCIE_PORT_DEVICE_MAXSERVICES;i++)
- vectors[i] = dev->irq;
- }
- }
- }
+ if (port_data->port_type == PCIE_RC_PORT && pcie_mch_quirk)
+ goto Fallback;
+
+ /* Try to use MSI-X if supported */
+ if (!pcie_port_enable_msix(dev, vectors, mask))
+ return PCIE_PORT_MSIX_MODE;
+
+ /* We're not going to use MSI-X, so try MSI and fall back to INTx */
+ if (!pci_enable_msi(dev))
+ interrupt_mode = PCIE_PORT_MSI_MODE;
+
+ Fallback:
+ if (interrupt_mode == PCIE_PORT_NO_IRQ && dev->pin)
+ interrupt_mode = PCIE_PORT_INTx_MODE;
+
+ irq = interrupt_mode != PCIE_PORT_NO_IRQ ? dev->irq : -1;
+ for (i = 0; i < PCIE_PORT_DEVICE_MAXSERVICES; i++)
+ vectors[i] = irq;
+
+ vectors[PCIE_PORT_SERVICE_VC_SHIFT] = -1;
+
return interrupt_mode;
}
pos + PCIE_SLOT_CAPABILITIES_REG, ®32);
if (reg32 & SLOT_HP_CAPABLE_MASK)
services |= PCIE_PORT_SERVICE_HP;
- }
- /* PME Capable - root port capability */
- if (((reg16 >> 4) & PORT_TYPE_MASK) == PCIE_RC_PORT)
- services |= PCIE_PORT_SERVICE_PME;
-
+ }
+ /* AER capable */
if (pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR))
services |= PCIE_PORT_SERVICE_AER;
+ /* VC support */
if (pci_find_ext_capability(dev, PCI_EXT_CAP_ID_VC))
services |= PCIE_PORT_SERVICE_VC;
* @port_type: Type of the port
* @service_type: Type of service to associate with the service device
* @irq: Interrupt vector to associate with the service device
- * @irq_mode: Interrupt mode of the service (INTx, MSI-X, MSI)
*/
static void pcie_device_init(struct pci_dev *parent, struct pcie_device *dev,
- int port_type, int service_type, int irq, int irq_mode)
+ int service_type, int irq)
{
+ struct pcie_port_data *port_data = pci_get_drvdata(parent);
struct device *device;
+ int port_type = port_data->port_type;
dev->port = parent;
- dev->interrupt_mode = irq_mode;
dev->irq = irq;
- dev->id.vendor = parent->vendor;
- dev->id.device = parent->device;
- dev->id.port_type = port_type;
- dev->id.service_type = (1 << service_type);
+ dev->service = service_type;
/* Initialize generic device interface */
device = &dev->device;
* @port_type: Type of the port
* @service_type: Type of service to associate with the service device
* @irq: Interrupt vector to associate with the service device
- * @irq_mode: Interrupt mode of the service (INTx, MSI-X, MSI)
*/
static struct pcie_device* alloc_pcie_device(struct pci_dev *parent,
- int port_type, int service_type, int irq, int irq_mode)
+ int service_type, int irq)
{
struct pcie_device *device;
if (!device)
return NULL;
- pcie_device_init(parent, device, port_type, service_type, irq,irq_mode);
+ pcie_device_init(parent, device, service_type, irq);
return device;
}
*/
int pcie_port_device_register(struct pci_dev *dev)
{
- struct pcie_port_device_ext *p_ext;
- int status, type, capabilities, irq_mode, i;
+ struct pcie_port_data *port_data;
+ int status, capabilities, irq_mode, i, nr_serv;
int vectors[PCIE_PORT_DEVICE_MAXSERVICES];
u16 reg16;
- /* Allocate port device extension */
- if (!(p_ext = kmalloc(sizeof(struct pcie_port_device_ext), GFP_KERNEL)))
+ port_data = kzalloc(sizeof(*port_data), GFP_KERNEL);
+ if (!port_data)
return -ENOMEM;
-
- pci_set_drvdata(dev, p_ext);
+ pci_set_drvdata(dev, port_data);
/* Get port type */
pci_read_config_word(dev,
pci_find_capability(dev, PCI_CAP_ID_EXP) +
PCIE_CAPABILITIES_REG, ®16);
- type = (reg16 >> 4) & PORT_TYPE_MASK;
+ port_data->port_type = (reg16 >> 4) & PORT_TYPE_MASK;
- /* Now get port services */
capabilities = get_port_device_capability(dev);
+ /* Root ports are capable of generating PME too */
+ if (port_data->port_type == PCIE_RC_PORT)
+ capabilities |= PCIE_PORT_SERVICE_PME;
+
irq_mode = assign_interrupt_mode(dev, vectors, capabilities);
- p_ext->interrupt_mode = irq_mode;
+ if (irq_mode == PCIE_PORT_NO_IRQ) {
+ /*
+ * Don't use service devices that require interrupts if there is
+ * no way to generate them.
+ */
+ if (!(capabilities & PCIE_PORT_SERVICE_VC)) {
+ status = -ENODEV;
+ goto Error;
+ }
+ capabilities = PCIE_PORT_SERVICE_VC;
+ }
+ port_data->port_irq_mode = irq_mode;
+
+ status = pci_enable_device(dev);
+ if (status)
+ goto Error;
+ pci_set_master(dev);
/* Allocate child services if any */
- for (i = 0; i < PCIE_PORT_DEVICE_MAXSERVICES; i++) {
+ for (i = 0, nr_serv = 0; i < PCIE_PORT_DEVICE_MAXSERVICES; i++) {
struct pcie_device *child;
+ int service = 1 << i;
+
+ if (!(capabilities & service))
+ continue;
- if (capabilities & (1 << i)) {
- child = alloc_pcie_device(
- dev, /* parent */
- type, /* port type */
- i, /* service type */
- vectors[i], /* irq */
- irq_mode /* interrupt mode */);
- if (child) {
- status = device_register(&child->device);
- if (status) {
- kfree(child);
- continue;
- }
- get_device(&child->device);
- }
+ child = alloc_pcie_device(dev, service, vectors[i]);
+ if (!child)
+ continue;
+
+ status = device_register(&child->device);
+ if (status) {
+ kfree(child);
+ continue;
}
+
+ get_device(&child->device);
+ nr_serv++;
+ }
+ if (!nr_serv) {
+ pci_disable_device(dev);
+ status = -ENODEV;
+ goto Error;
}
+
return 0;
+
+ Error:
+ kfree(port_data);
+ return status;
}
#ifdef CONFIG_PM
static int suspend_iter(struct device *dev, void *data)
{
struct pcie_port_service_driver *service_driver;
- pm_message_t state = * (pm_message_t *) data;
if ((dev->bus == &pcie_port_bus_type) &&
(dev->driver)) {
service_driver = to_service_driver(dev->driver);
if (service_driver->suspend)
- service_driver->suspend(to_pcie_device(dev), state);
+ service_driver->suspend(to_pcie_device(dev));
}
return 0;
}
/**
* pcie_port_device_suspend - suspend port services associated with a PCIe port
* @dev: PCI Express port to handle
- * @state: Representation of system power management transition in progress
*/
-int pcie_port_device_suspend(struct pci_dev *dev, pm_message_t state)
+int pcie_port_device_suspend(struct device *dev)
{
- return device_for_each_child(&dev->dev, &state, suspend_iter);
+ return device_for_each_child(dev, NULL, suspend_iter);
}
static int resume_iter(struct device *dev, void *data)
* pcie_port_device_suspend - resume port services associated with a PCIe port
* @dev: PCI Express port to handle
*/
-int pcie_port_device_resume(struct pci_dev *dev)
+int pcie_port_device_resume(struct device *dev)
{
- return device_for_each_child(&dev->dev, NULL, resume_iter);
+ return device_for_each_child(dev, NULL, resume_iter);
}
-#endif
+#endif /* PM */
static int remove_iter(struct device *dev, void *data)
{
- struct pcie_port_service_driver *service_driver;
-
if (dev->bus == &pcie_port_bus_type) {
- if (dev->driver) {
- service_driver = to_service_driver(dev->driver);
- if (service_driver->remove)
- service_driver->remove(to_pcie_device(dev));
- }
- *(unsigned long*)data = (unsigned long)dev;
- return 1;
+ put_device(dev);
+ device_unregister(dev);
}
return 0;
}
*/
void pcie_port_device_remove(struct pci_dev *dev)
{
- struct device *device;
- unsigned long device_addr;
- int interrupt_mode = PCIE_PORT_INTx_MODE;
- int status;
+ struct pcie_port_data *port_data = pci_get_drvdata(dev);
- do {
- status = device_for_each_child(&dev->dev, &device_addr, remove_iter);
- if (status) {
- device = (struct device*)device_addr;
- interrupt_mode = (to_pcie_device(device))->interrupt_mode;
- put_device(device);
- device_unregister(device);
- }
- } while (status);
- /* Switch to INTx by default if MSI enabled */
- if (interrupt_mode == PCIE_PORT_MSIX_MODE)
+ device_for_each_child(&dev->dev, NULL, remove_iter);
+ pci_disable_device(dev);
+
+ switch (port_data->port_irq_mode) {
+ case PCIE_PORT_MSIX_MODE:
pci_disable_msix(dev);
- else if (interrupt_mode == PCIE_PORT_MSI_MODE)
+ break;
+ case PCIE_PORT_MSI_MODE:
pci_disable_msi(dev);
+ break;
+ }
+
+ kfree(port_data);
}
/**
return -ENODEV;
pciedev = to_pcie_device(dev);
- status = driver->probe(pciedev, driver->id_table);
+ status = driver->probe(pciedev);
if (!status) {
dev_printk(KERN_DEBUG, dev, "service driver %s loaded\n",
driver->name);
projects / linux-2.6-omap-h63xx.git / blobdiff