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authorHidetoshi Seto <seto.hidetoshi@jp.fujitsu.com>2010-04-15 08:21:27 +0400
committerJesse Barnes <jbarnes@virtuousgeek.org>2010-05-11 23:01:38 +0400
commit89713422a768458a0d375f0c2f3586cd5ccde6a1 (patch)
treec446440123602cdb5320617ac7a8c2dbf514ff41 /drivers/pci/pcie
parent517cae3829ae8cc3033c24f60e64eb251b2f0d14 (diff)
downloadlinux-89713422a768458a0d375f0c2f3586cd5ccde6a1.tar.xz
PCI: aerdrv: introduce default_downstream_reset_link
I noticed that when I inject a fatal error to an endpoint via aer-inject, aer_root_reset() is called as reset_link for a downstream port at upstream of the endpoint: pcieport 0000:00:06.0: AER: Uncorrected (Fatal) error received: id=5401 : pcieport 0000:52:02.0: Root Port link has been reset It externally appears to be working, but internally issues some accesses to PCI_ERR_ROOT_COMMAND/STATUS registers that is for root port so not available on downstream port. This patch introduces default_downstream_reset_link that is a version of aer_root_reset() with no accesses to root port's register. It is used for downstream ports that has no reset_link function its specific. This patch also updates related description in pcieaer-howto.txt. Some minor fixes are included. Signed-off-by: Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com> Reviewed-by: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Diffstat (limited to 'drivers/pci/pcie')
-rw-r--r--drivers/pci/pcie/aer/aerdrv.c23
-rw-r--r--drivers/pci/pcie/aer/aerdrv.h1
-rw-r--r--drivers/pci/pcie/aer/aerdrv_core.c78
3 files changed, 63 insertions, 39 deletions
diff --git a/drivers/pci/pcie/aer/aerdrv.c b/drivers/pci/pcie/aer/aerdrv.c
index cbc7cc77b2c3..a225d58c1ac8 100644
--- a/drivers/pci/pcie/aer/aerdrv.c
+++ b/drivers/pci/pcie/aer/aerdrv.c
@@ -341,7 +341,6 @@ static int __devinit aer_probe(struct pcie_device *dev)
**/
static pci_ers_result_t aer_root_reset(struct pci_dev *dev)
{
- u16 p2p_ctrl;
u32 reg32;
int pos;
@@ -352,27 +351,7 @@ static pci_ers_result_t aer_root_reset(struct pci_dev *dev)
reg32 &= ~ROOT_PORT_INTR_ON_MESG_MASK;
pci_write_config_dword(dev, pos + PCI_ERR_ROOT_COMMAND, reg32);
- /* Assert Secondary Bus Reset */
- pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &p2p_ctrl);
- p2p_ctrl |= PCI_BRIDGE_CTL_BUS_RESET;
- pci_write_config_word(dev, PCI_BRIDGE_CONTROL, p2p_ctrl);
-
- /*
- * we should send hot reset message for 2ms to allow it time to
- * propogate to all downstream ports
- */
- msleep(2);
-
- /* De-assert Secondary Bus Reset */
- p2p_ctrl &= ~PCI_BRIDGE_CTL_BUS_RESET;
- pci_write_config_word(dev, PCI_BRIDGE_CONTROL, p2p_ctrl);
-
- /*
- * System software must wait for at least 100ms from the end
- * of a reset of one or more device before it is permitted
- * to issue Configuration Requests to those devices.
- */
- msleep(200);
+ aer_do_secondary_bus_reset(dev);
dev_printk(KERN_DEBUG, &dev->dev, "Root Port link has been reset\n");
/* Clear Root Error Status */
diff --git a/drivers/pci/pcie/aer/aerdrv.h b/drivers/pci/pcie/aer/aerdrv.h
index d0f8291c5ca0..7aaae2d2bd67 100644
--- a/drivers/pci/pcie/aer/aerdrv.h
+++ b/drivers/pci/pcie/aer/aerdrv.h
@@ -114,6 +114,7 @@ static inline pci_ers_result_t merge_result(enum pci_ers_result orig,
}
extern struct bus_type pcie_port_bus_type;
+extern void aer_do_secondary_bus_reset(struct pci_dev *dev);
extern int aer_init(struct pcie_device *dev);
extern void aer_isr(struct work_struct *work);
extern void aer_print_error(struct pci_dev *dev, struct aer_err_info *info);
diff --git a/drivers/pci/pcie/aer/aerdrv_core.c b/drivers/pci/pcie/aer/aerdrv_core.c
index 8fb14aeb74dd..ce42cac99dd3 100644
--- a/drivers/pci/pcie/aer/aerdrv_core.c
+++ b/drivers/pci/pcie/aer/aerdrv_core.c
@@ -373,6 +373,53 @@ static pci_ers_result_t broadcast_error_message(struct pci_dev *dev,
return result_data.result;
}
+/**
+ * aer_do_secondary_bus_reset - perform secondary bus reset
+ * @dev: pointer to bridge's pci_dev data structure
+ *
+ * Invoked when performing link reset at Root Port or Downstream Port.
+ */
+void aer_do_secondary_bus_reset(struct pci_dev *dev)
+{
+ u16 p2p_ctrl;
+
+ /* Assert Secondary Bus Reset */
+ pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &p2p_ctrl);
+ p2p_ctrl |= PCI_BRIDGE_CTL_BUS_RESET;
+ pci_write_config_word(dev, PCI_BRIDGE_CONTROL, p2p_ctrl);
+
+ /*
+ * we should send hot reset message for 2ms to allow it time to
+ * propagate to all downstream ports
+ */
+ msleep(2);
+
+ /* De-assert Secondary Bus Reset */
+ p2p_ctrl &= ~PCI_BRIDGE_CTL_BUS_RESET;
+ pci_write_config_word(dev, PCI_BRIDGE_CONTROL, p2p_ctrl);
+
+ /*
+ * System software must wait for at least 100ms from the end
+ * of a reset of one or more device before it is permitted
+ * to issue Configuration Requests to those devices.
+ */
+ msleep(200);
+}
+
+/**
+ * default_downstream_reset_link - default reset function for Downstream Port
+ * @dev: pointer to downstream port's pci_dev data structure
+ *
+ * Invoked when performing link reset at Downstream Port w/ no aer driver.
+ */
+static pci_ers_result_t default_downstream_reset_link(struct pci_dev *dev)
+{
+ aer_do_secondary_bus_reset(dev);
+ dev_printk(KERN_DEBUG, &dev->dev,
+ "Downstream Port link has been reset\n");
+ return PCI_ERS_RESULT_RECOVERED;
+}
+
static int find_aer_service_iter(struct device *device, void *data)
{
struct pcie_port_service_driver *service_driver, **drv;
@@ -406,31 +453,28 @@ static pci_ers_result_t reset_link(struct pcie_device *aerdev,
pci_ers_result_t status;
struct pcie_port_service_driver *driver;
- if (dev->hdr_type & PCI_HEADER_TYPE_BRIDGE)
+ if (dev->hdr_type & PCI_HEADER_TYPE_BRIDGE) {
+ /* Reset this port for all subordinates */
udev = dev;
- else
+ } else {
+ /* Reset the upstream component (likely downstream port) */
udev = dev->bus->self;
+ }
/* Use the aer driver of the component firstly */
driver = find_aer_service(udev);
- /*
- * If it hasn't the driver and is downstream port, use the root port's
- */
- if (!driver || !driver->reset_link) {
- if (udev->pcie_type == PCI_EXP_TYPE_DOWNSTREAM &&
- aerdev->device.driver &&
- to_service_driver(aerdev->device.driver)->reset_link) {
- driver = to_service_driver(aerdev->device.driver);
- } else {
- dev_printk(KERN_DEBUG, &dev->dev,
- "no link-reset support at upstream device %s\n",
- pci_name(udev));
- return PCI_ERS_RESULT_DISCONNECT;
- }
+ if (driver && driver->reset_link) {
+ status = driver->reset_link(udev);
+ } else if (udev->pcie_type == PCI_EXP_TYPE_DOWNSTREAM) {
+ status = default_downstream_reset_link(udev);
+ } else {
+ dev_printk(KERN_DEBUG, &dev->dev,
+ "no link-reset support at upstream device %s\n",
+ pci_name(udev));
+ return PCI_ERS_RESULT_DISCONNECT;
}
- status = driver->reset_link(udev);
if (status != PCI_ERS_RESULT_RECOVERED) {
dev_printk(KERN_DEBUG, &dev->dev,
"link reset at upstream device %s failed\n",