On 2018-05-11 16:13, Oza Pawandeep wrote:
DPC driver implements link_reset callback, and calls
pci_do_fatal_recovery().
Which follows standard path of ERR_FATAL recovery.
Signed-off-by: Oza Pawandeep <[email protected]>
diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
index 5e8857a..6af7595 100644
--- a/drivers/pci/pci.h
+++ b/drivers/pci/pci.h
@@ -354,7 +354,7 @@ static inline resource_size_t
pci_resource_alignment(struct pci_dev *dev,
void pci_enable_acs(struct pci_dev *dev);
/* PCI error reporting and recovery */
-void pcie_do_fatal_recovery(struct pci_dev *dev);
+void pcie_do_fatal_recovery(struct pci_dev *dev, u32 service);
void pcie_do_nonfatal_recovery(struct pci_dev *dev);
bool pcie_wait_for_link(struct pci_dev *pdev, bool active);
diff --git a/drivers/pci/pcie/aer/aerdrv_core.c
b/drivers/pci/pcie/aer/aerdrv_core.c
index fdfc474..36e622d 100644
--- a/drivers/pci/pcie/aer/aerdrv_core.c
+++ b/drivers/pci/pcie/aer/aerdrv_core.c
@@ -254,7 +254,7 @@ static void handle_error_source(struct pcie_device
*aerdev,
} else if (info->severity == AER_NONFATAL)
pcie_do_nonfatal_recovery(dev);
else if (info->severity == AER_FATAL)
- pcie_do_fatal_recovery(dev);
+ pcie_do_fatal_recovery(dev, PCIE_PORT_SERVICE_AER);
}
#ifdef CONFIG_ACPI_APEI_PCIEAER
@@ -321,7 +321,7 @@ static void aer_recover_work_func(struct
work_struct *work)
if (entry.severity == AER_NONFATAL)
pcie_do_nonfatal_recovery(pdev);
else if (entry.severity == AER_FATAL)
- pcie_do_fatal_recovery(pdev);
+ pcie_do_fatal_recovery(pdev, PCIE_PORT_SERVICE_AER);
pci_dev_put(pdev);
}
}
diff --git a/drivers/pci/pcie/dpc.c b/drivers/pci/pcie/dpc.c
index 80ec384..5680c13 100644
--- a/drivers/pci/pcie/dpc.c
+++ b/drivers/pci/pcie/dpc.c
@@ -73,29 +73,31 @@ static void dpc_wait_link_inactive(struct dpc_dev
*dpc)
pcie_wait_for_link(pdev, false);
}
-static void dpc_work(struct work_struct *work)
+static pci_ers_result_t dpc_reset_link(struct pci_dev *pdev)
{
- struct dpc_dev *dpc = container_of(work, struct dpc_dev, work);
- struct pci_dev *dev, *temp, *pdev = dpc->dev->port;
- struct pci_bus *parent = pdev->subordinate;
- u16 cap = dpc->cap_pos, ctl;
-
- pci_lock_rescan_remove();
- list_for_each_entry_safe_reverse(dev, temp, &parent->devices,
- bus_list) {
- pci_dev_get(dev);
- pci_dev_set_disconnected(dev, NULL);
- if (pci_has_subordinate(dev))
- pci_walk_bus(dev->subordinate,
- pci_dev_set_disconnected, NULL);
- pci_stop_and_remove_bus_device(dev);
- pci_dev_put(dev);
- }
- pci_unlock_rescan_remove();
-
+ struct dpc_dev *dpc;
+ struct pcie_device *pciedev;
+ struct device *devdpc;
+ u16 cap, ctl;
+
+ /*
+ * DPC disables the Link automatically in hardware, so it has
+ * already been reset by the time we get here.
+ */
+
+ devdpc = pcie_port_find_device(pdev, PCIE_PORT_SERVICE_DPC);
+ pciedev = to_pcie_device(devdpc);
+ dpc = get_service_data(pciedev);
+ cap = dpc->cap_pos;
+
+ /*
+ * Waiting until the link is inactive, then clearing DPC
+ * trigger status to allow the port to leave DPC.
+ */
dpc_wait_link_inactive(dpc);
+
if (dpc->rp_extensions && dpc_wait_rp_inactive(dpc))
- return;
+ return PCI_ERS_RESULT_DISCONNECT;
if (dpc->rp_extensions && dpc->rp_pio_status) {
pci_write_config_dword(pdev, cap + PCI_EXP_DPC_RP_PIO_STATUS,
dpc->rp_pio_status);
@@ -108,6 +110,17 @@ static void dpc_work(struct work_struct *work)
pci_read_config_word(pdev, cap + PCI_EXP_DPC_CTL, &ctl);
pci_write_config_word(pdev, cap + PCI_EXP_DPC_CTL,
ctl | PCI_EXP_DPC_CTL_INT_EN);
+
+ return PCI_ERS_RESULT_RECOVERED;
+}
+
+static void dpc_work(struct work_struct *work)
+{
+ struct dpc_dev *dpc = container_of(work, struct dpc_dev, work);
+ struct pci_dev *pdev = dpc->dev->port;
+
+ /* From DPC point of view error is always FATAL. */
+ pcie_do_fatal_recovery(pdev, PCIE_PORT_SERVICE_DPC);
}
static void dpc_process_rp_pio_error(struct dpc_dev *dpc)
@@ -288,6 +301,7 @@ static struct pcie_port_service_driver dpcdriver =
{
.service = PCIE_PORT_SERVICE_DPC,
.probe = dpc_probe,
.remove = dpc_remove,
+ .reset_link = dpc_reset_link,
};
static int __init dpc_service_init(void)
diff --git a/drivers/pci/pcie/err.c b/drivers/pci/pcie/err.c
index 33a16b1..29ff148 100644
--- a/drivers/pci/pcie/err.c
+++ b/drivers/pci/pcie/err.c
@@ -185,7 +185,7 @@ static pci_ers_result_t default_reset_link(struct
pci_dev *dev)
return PCI_ERS_RESULT_RECOVERED;
}
-static pci_ers_result_t reset_link(struct pci_dev *dev)
+static pci_ers_result_t reset_link(struct pci_dev *dev, u32 service)
{
struct pci_dev *udev;
pci_ers_result_t status;
@@ -200,7 +200,7 @@ static pci_ers_result_t reset_link(struct pci_dev
*dev)
}
/* Use the aer driver of the component firstly */
- driver = pcie_port_find_service(udev, PCIE_PORT_SERVICE_AER);
+ driver = pcie_port_find_service(udev, service);
if (driver && driver->reset_link) {
status = driver->reset_link(udev);
@@ -287,7 +287,7 @@ static pci_ers_result_t
broadcast_error_message(struct pci_dev *dev,
* followed by re-enumeration of devices.
*/
-void pcie_do_fatal_recovery(struct pci_dev *dev)
+void pcie_do_fatal_recovery(struct pci_dev *dev, u32 service)
{
struct pci_dev *udev;
struct pci_bus *parent;
@@ -313,7 +313,7 @@ void pcie_do_fatal_recovery(struct pci_dev *dev)
pci_dev_put(pdev);
}
- result = reset_link(udev);
+ result = reset_link(udev, service);
if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) {
/*
diff --git a/include/linux/aer.h b/include/linux/aer.h
index 8f87bbe..0c506fe 100644
--- a/include/linux/aer.h
+++ b/include/linux/aer.h
@@ -14,6 +14,7 @@
#define AER_NONFATAL 0
#define AER_FATAL 1
#define AER_CORRECTABLE 2
+#define DPC_FATAL 4
struct pci_dev;
Hi Bjorn,
I have addressed all the comments, and I hope we are heading towards
closure.
I just figure that pcie_do_fatal_recovery (which is getting executed
for DPC as well)
if (result == PCI_ERS_RESULT_RECOVERED) {
if (pcie_wait_for_link(udev, true))
pci_rescan_bus(udev->bus);
pci_info(dev, "Device recovery successful\n");
}
I have to correct it to
if (service==AER && result == PCI_ERS_RESULT_RECOVERED) {
if (pcie_wait_for_link(udev, true))
pci_rescan_bus(udev->bus);
pci_info(dev, "Device recovery successful\n");
}
rest of the things look okay to me.
If you have any more comments,
I can fix them with this one and hopefully v17 will be the final one.
PS: I am going though the code more, and we can have some follow up
patches (probably some cleanup)
for e.g. pcie_portdrv_slot_reset() checks
if (dev->error_state == pci_channel_io_frozen) {
dev->state_saved = true;
pci_restore_state(dev);
pcie_portdrv_restore_config(dev);
pci_enable_pcie_error_reporting(dev);
}
but now since the ERR_FATAL path does not call pcie_portdrv_slot_reset
the check is meaning less.
besides driver's shut_down callbacks might want to handle
pci_channel_io_frozen, but that something left to be discussed later.
So, I am not touching dev->error_state anywhere as of now in ERR_FATAL
case.
Regards,
Oza.
