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-rw-r--r--drivers/pci/hotplug/cpci_hotplug.h3
-rw-r--r--drivers/pci/hotplug/cpci_hotplug_pci.c2
-rw-r--r--drivers/pci/hotplug/cpqphp_core.c7
-rw-r--r--drivers/pci/hotplug/cpqphp_ctrl.c2
-rw-r--r--drivers/pci/hotplug/pci_hotplug_core.c8
-rw-r--r--drivers/pci/hotplug/pciehp.h3
-rw-r--r--drivers/pci/hotplug/pciehp_hpc.c36
-rw-r--r--drivers/pci/hotplug/rpadlpar_sysfs.c4
-rw-r--r--drivers/pci/hotplug/shpchp_sysfs.c38
9 files changed, 74 insertions, 29 deletions
diff --git a/drivers/pci/hotplug/cpci_hotplug.h b/drivers/pci/hotplug/cpci_hotplug.h
index f33ff2bca414..3fdd1b9bd8c3 100644
--- a/drivers/pci/hotplug/cpci_hotplug.h
+++ b/drivers/pci/hotplug/cpci_hotplug.h
@@ -75,6 +75,9 @@ int cpci_hp_unregister_bus(struct pci_bus *bus);
int cpci_hp_start(void);
int cpci_hp_stop(void);
+/* Global variables */
+extern int cpci_debug;
+
/*
* Internal function prototypes, these functions should not be used by
* board/chassis drivers.
diff --git a/drivers/pci/hotplug/cpci_hotplug_pci.c b/drivers/pci/hotplug/cpci_hotplug_pci.c
index 2c16adb7f4ec..6c48066acb44 100644
--- a/drivers/pci/hotplug/cpci_hotplug_pci.c
+++ b/drivers/pci/hotplug/cpci_hotplug_pci.c
@@ -19,8 +19,6 @@
#define MY_NAME "cpci_hotplug"
-extern int cpci_debug;
-
#define dbg(format, arg...) \
do { \
if (cpci_debug) \
diff --git a/drivers/pci/hotplug/cpqphp_core.c b/drivers/pci/hotplug/cpqphp_core.c
index b8aacb41a83c..f99a7927e5a8 100644
--- a/drivers/pci/hotplug/cpqphp_core.c
+++ b/drivers/pci/hotplug/cpqphp_core.c
@@ -296,9 +296,10 @@ static int ctrl_slot_cleanup(struct controller *ctrl)
*
* Won't work for more than one PCI-PCI bridge in a slot.
*
- * @bus_num - bus number of PCI device
- * @dev_num - device number of PCI device
- * @slot - Pointer to u8 where slot number will be returned
+ * @bus: pointer to the PCI bus structure
+ * @bus_num: bus number of PCI device
+ * @dev_num: device number of PCI device
+ * @slot: Pointer to u8 where slot number will be returned
*
* Output: SUCCESS or FAILURE
*/
diff --git a/drivers/pci/hotplug/cpqphp_ctrl.c b/drivers/pci/hotplug/cpqphp_ctrl.c
index 68de958a9be8..1b26ca0b3701 100644
--- a/drivers/pci/hotplug/cpqphp_ctrl.c
+++ b/drivers/pci/hotplug/cpqphp_ctrl.c
@@ -1877,7 +1877,7 @@ static void interrupt_event_handler(struct controller *ctrl)
/**
* cpqhp_pushbutton_thread - handle pushbutton events
- * @slot: target slot (struct)
+ * @t: pointer to struct timer_list which holds all timer-related callbacks
*
* Scheduled procedure to handle blocking stuff for the pushbuttons.
* Handles all pending events and exits.
diff --git a/drivers/pci/hotplug/pci_hotplug_core.c b/drivers/pci/hotplug/pci_hotplug_core.c
index 5ac31f683b85..058d5937d8a9 100644
--- a/drivers/pci/hotplug/pci_hotplug_core.c
+++ b/drivers/pci/hotplug/pci_hotplug_core.c
@@ -73,7 +73,7 @@ static ssize_t power_read_file(struct pci_slot *pci_slot, char *buf)
if (retval)
return retval;
- return sprintf(buf, "%d\n", value);
+ return sysfs_emit(buf, "%d\n", value);
}
static ssize_t power_write_file(struct pci_slot *pci_slot, const char *buf,
@@ -130,7 +130,7 @@ static ssize_t attention_read_file(struct pci_slot *pci_slot, char *buf)
if (retval)
return retval;
- return sprintf(buf, "%d\n", value);
+ return sysfs_emit(buf, "%d\n", value);
}
static ssize_t attention_write_file(struct pci_slot *pci_slot, const char *buf,
@@ -175,7 +175,7 @@ static ssize_t latch_read_file(struct pci_slot *pci_slot, char *buf)
if (retval)
return retval;
- return sprintf(buf, "%d\n", value);
+ return sysfs_emit(buf, "%d\n", value);
}
static struct pci_slot_attribute hotplug_slot_attr_latch = {
@@ -192,7 +192,7 @@ static ssize_t presence_read_file(struct pci_slot *pci_slot, char *buf)
if (retval)
return retval;
- return sprintf(buf, "%d\n", value);
+ return sysfs_emit(buf, "%d\n", value);
}
static struct pci_slot_attribute hotplug_slot_attr_presence = {
diff --git a/drivers/pci/hotplug/pciehp.h b/drivers/pci/hotplug/pciehp.h
index 4fd200d8b0a9..d4a930881054 100644
--- a/drivers/pci/hotplug/pciehp.h
+++ b/drivers/pci/hotplug/pciehp.h
@@ -47,6 +47,9 @@ extern int pciehp_poll_time;
* struct controller - PCIe hotplug controller
* @pcie: pointer to the controller's PCIe port service device
* @slot_cap: cached copy of the Slot Capabilities register
+ * @inband_presence_disabled: In-Band Presence Detect Disable supported by
+ * controller and disabled per spec recommendation (PCIe r5.0, appendix I
+ * implementation note)
* @slot_ctrl: cached copy of the Slot Control register
* @ctrl_lock: serializes writes to the Slot Control register
* @cmd_started: jiffies when the Slot Control register was last written;
diff --git a/drivers/pci/hotplug/pciehp_hpc.c b/drivers/pci/hotplug/pciehp_hpc.c
index fb3840e222ad..9d06939736c0 100644
--- a/drivers/pci/hotplug/pciehp_hpc.c
+++ b/drivers/pci/hotplug/pciehp_hpc.c
@@ -563,6 +563,32 @@ void pciehp_power_off_slot(struct controller *ctrl)
PCI_EXP_SLTCTL_PWR_OFF);
}
+static void pciehp_ignore_dpc_link_change(struct controller *ctrl,
+ struct pci_dev *pdev, int irq)
+{
+ /*
+ * Ignore link changes which occurred while waiting for DPC recovery.
+ * Could be several if DPC triggered multiple times consecutively.
+ */
+ synchronize_hardirq(irq);
+ atomic_and(~PCI_EXP_SLTSTA_DLLSC, &ctrl->pending_events);
+ if (pciehp_poll_mode)
+ pcie_capability_write_word(pdev, PCI_EXP_SLTSTA,
+ PCI_EXP_SLTSTA_DLLSC);
+ ctrl_info(ctrl, "Slot(%s): Link Down/Up ignored (recovered by DPC)\n",
+ slot_name(ctrl));
+
+ /*
+ * If the link is unexpectedly down after successful recovery,
+ * the corresponding link change may have been ignored above.
+ * Synthesize it to ensure that it is acted on.
+ */
+ down_read(&ctrl->reset_lock);
+ if (!pciehp_check_link_active(ctrl))
+ pciehp_request(ctrl, PCI_EXP_SLTSTA_DLLSC);
+ up_read(&ctrl->reset_lock);
+}
+
static irqreturn_t pciehp_isr(int irq, void *dev_id)
{
struct controller *ctrl = (struct controller *)dev_id;
@@ -707,6 +733,16 @@ static irqreturn_t pciehp_ist(int irq, void *dev_id)
}
/*
+ * Ignore Link Down/Up events caused by Downstream Port Containment
+ * if recovery from the error succeeded.
+ */
+ if ((events & PCI_EXP_SLTSTA_DLLSC) && pci_dpc_recovered(pdev) &&
+ ctrl->state == ON_STATE) {
+ events &= ~PCI_EXP_SLTSTA_DLLSC;
+ pciehp_ignore_dpc_link_change(ctrl, pdev, irq);
+ }
+
+ /*
* Disable requests have higher priority than Presence Detect Changed
* or Data Link Layer State Changed events.
*/
diff --git a/drivers/pci/hotplug/rpadlpar_sysfs.c b/drivers/pci/hotplug/rpadlpar_sysfs.c
index dbfa0b55d31a..068b7810a574 100644
--- a/drivers/pci/hotplug/rpadlpar_sysfs.c
+++ b/drivers/pci/hotplug/rpadlpar_sysfs.c
@@ -50,7 +50,7 @@ static ssize_t add_slot_store(struct kobject *kobj, struct kobj_attribute *attr,
static ssize_t add_slot_show(struct kobject *kobj,
struct kobj_attribute *attr, char *buf)
{
- return sprintf(buf, "0\n");
+ return sysfs_emit(buf, "0\n");
}
static ssize_t remove_slot_store(struct kobject *kobj,
@@ -80,7 +80,7 @@ static ssize_t remove_slot_store(struct kobject *kobj,
static ssize_t remove_slot_show(struct kobject *kobj,
struct kobj_attribute *attr, char *buf)
{
- return sprintf(buf, "0\n");
+ return sysfs_emit(buf, "0\n");
}
static struct kobj_attribute add_slot_attr =
diff --git a/drivers/pci/hotplug/shpchp_sysfs.c b/drivers/pci/hotplug/shpchp_sysfs.c
index 45658bb5c554..64beed7a26be 100644
--- a/drivers/pci/hotplug/shpchp_sysfs.c
+++ b/drivers/pci/hotplug/shpchp_sysfs.c
@@ -24,50 +24,54 @@
static ssize_t show_ctrl(struct device *dev, struct device_attribute *attr, char *buf)
{
struct pci_dev *pdev;
- char *out = buf;
int index, busnr;
struct resource *res;
struct pci_bus *bus;
+ size_t len = 0;
pdev = to_pci_dev(dev);
bus = pdev->subordinate;
- out += sprintf(buf, "Free resources: memory\n");
+ len += sysfs_emit_at(buf, len, "Free resources: memory\n");
pci_bus_for_each_resource(bus, res, index) {
if (res && (res->flags & IORESOURCE_MEM) &&
!(res->flags & IORESOURCE_PREFETCH)) {
- out += sprintf(out, "start = %8.8llx, length = %8.8llx\n",
- (unsigned long long)res->start,
- (unsigned long long)resource_size(res));
+ len += sysfs_emit_at(buf, len,
+ "start = %8.8llx, length = %8.8llx\n",
+ (unsigned long long)res->start,
+ (unsigned long long)resource_size(res));
}
}
- out += sprintf(out, "Free resources: prefetchable memory\n");
+ len += sysfs_emit_at(buf, len, "Free resources: prefetchable memory\n");
pci_bus_for_each_resource(bus, res, index) {
if (res && (res->flags & IORESOURCE_MEM) &&
(res->flags & IORESOURCE_PREFETCH)) {
- out += sprintf(out, "start = %8.8llx, length = %8.8llx\n",
- (unsigned long long)res->start,
- (unsigned long long)resource_size(res));
+ len += sysfs_emit_at(buf, len,
+ "start = %8.8llx, length = %8.8llx\n",
+ (unsigned long long)res->start,
+ (unsigned long long)resource_size(res));
}
}
- out += sprintf(out, "Free resources: IO\n");
+ len += sysfs_emit_at(buf, len, "Free resources: IO\n");
pci_bus_for_each_resource(bus, res, index) {
if (res && (res->flags & IORESOURCE_IO)) {
- out += sprintf(out, "start = %8.8llx, length = %8.8llx\n",
- (unsigned long long)res->start,
- (unsigned long long)resource_size(res));
+ len += sysfs_emit_at(buf, len,
+ "start = %8.8llx, length = %8.8llx\n",
+ (unsigned long long)res->start,
+ (unsigned long long)resource_size(res));
}
}
- out += sprintf(out, "Free resources: bus numbers\n");
+ len += sysfs_emit_at(buf, len, "Free resources: bus numbers\n");
for (busnr = bus->busn_res.start; busnr <= bus->busn_res.end; busnr++) {
if (!pci_find_bus(pci_domain_nr(bus), busnr))
break;
}
if (busnr < bus->busn_res.end)
- out += sprintf(out, "start = %8.8x, length = %8.8x\n",
- busnr, (int)(bus->busn_res.end - busnr));
+ len += sysfs_emit_at(buf, len,
+ "start = %8.8x, length = %8.8x\n",
+ busnr, (int)(bus->busn_res.end - busnr));
- return out - buf;
+ return len;
}
static DEVICE_ATTR(ctrl, S_IRUGO, show_ctrl, NULL);
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