On 2018-02-24 21:11, Bjorn Helgaas wrote:
In subject:
s/pci/PCI/
sure.
On Fri, Feb 23, 2018 at 01:54:03PM +0530, Oza Pawandeep wrote:
Clients such as pciehp, dpc are using pcie_wait_link_active, which
waits
till the link becomes active or inactive.
Use "()" after function names so we have a visual clue that they are
functions.
Made generic function and moved it to drivers/pci/pci.c
Signed-off-by: Oza Pawandeep <poza@xxxxxxxxxxxxxx>
diff --git a/drivers/pci/hotplug/pciehp_hpc.c
b/drivers/pci/hotplug/pciehp_hpc.c
index 18a42f8..de9b0ea 100644
--- a/drivers/pci/hotplug/pciehp_hpc.c
+++ b/drivers/pci/hotplug/pciehp_hpc.c
@@ -231,25 +231,11 @@ bool pciehp_check_link_active(struct controller
*ctrl)
return ret;
}
-static void __pcie_wait_link_active(struct controller *ctrl, bool
active)
+static bool pcie_wait_link_active(struct controller *ctrl)
{
- int timeout = 1000;
-
- if (pciehp_check_link_active(ctrl) == active)
- return;
- while (timeout > 0) {
- msleep(10);
- timeout -= 10;
- if (pciehp_check_link_active(ctrl) == active)
- return;
- }
- ctrl_dbg(ctrl, "Data Link Layer Link Active not %s in 1000 msec\n",
- active ? "set" : "cleared");
-}
+ struct pci_dev *pdev = ctrl_dev(ctrl);
-static void pcie_wait_link_active(struct controller *ctrl)
-{
- __pcie_wait_link_active(ctrl, true);
+ return pci_wait_for_link(pdev, true);
}
static bool pci_bus_check_dev(struct pci_bus *bus, int devfn)
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index f6a4dd1..f8d44b4 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -4176,6 +4176,37 @@ static int pci_pm_reset(struct pci_dev *dev,
int probe)
return 0;
}
+/**
+ * pci_wait_for_link - Wait for link till its active/inactive
s/its/it's/
sure.
+ * @pdev: Bridge device
+ * @active: waiting for active or inactive ?
+ *
+ * Use this to wait till link becomes active or inactive.
+ */
+bool pci_wait_for_link(struct pci_dev *pdev, bool active)
I think this should be "pcie_wait_for_link()". There's no concept of a
link in conventional PCI.
+{
+ int timeout = 1000;
+ bool ret;
+ u16 lnk_status;
+
+ for (;;) {
+ pcie_capability_read_word(pdev, PCI_EXP_LNKSTA, &lnk_status);
+ ret = !!(lnk_status & PCI_EXP_LNKSTA_DLLLA);
+ if (ret == active)
+ return true;
+ if (timeout <= 0)
+ break;
+ timeout -= 10;
+ }
+
+ dev_printk(KERN_DEBUG, &pdev->dev,
pci_info(). Distros often seem to have logging configured so
KERN_DEBUG things aren't captured, and this definitely seems worth
capturing.
+ "Data Link Layer Link Active not %s in 1000 msec\n",
+ active ? "set" : "cleared");
+
+ return false;
+}
+EXPORT_SYMBOL(pci_wait_for_link);
I don't think this needs to be exported.
sure.
void pci_reset_secondary_bus(struct pci_dev *dev)
{
u16 ctrl;
diff --git a/drivers/pci/pcie/pcie-dpc.c b/drivers/pci/pcie/pcie-dpc.c
index 5c01c63..e15bcda 100644
--- a/drivers/pci/pcie/pcie-dpc.c
+++ b/drivers/pci/pcie/pcie-dpc.c
@@ -120,19 +120,9 @@ static int dpc_wait_rp_inactive(struct dpc_dev
*dpc)
static void dpc_wait_link_inactive(struct dpc_dev *dpc)
{
- unsigned long timeout = jiffies + HZ;
struct pci_dev *pdev = dpc->dev->port;
- struct device *dev = &dpc->dev->device;
- u16 lnk_status;
- pcie_capability_read_word(pdev, PCI_EXP_LNKSTA, &lnk_status);
- while (lnk_status & PCI_EXP_LNKSTA_DLLLA &&
- !time_after(jiffies, timeout)) {
- msleep(10);
- pcie_capability_read_word(pdev, PCI_EXP_LNKSTA, &lnk_status);
- }
- if (lnk_status & PCI_EXP_LNKSTA_DLLLA)
- dev_warn(dev, "Link state not disabled for DPC event\n");
+ pci_wait_for_link(pdev, false);
}
/**
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 024a1be..cb674c3 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -1195,6 +1195,7 @@ int pci_add_ext_cap_save_buffer(struct pci_dev
*dev,
int pci_request_selected_regions(struct pci_dev *, int, const char
*);
int pci_request_selected_regions_exclusive(struct pci_dev *, int,
const char *);
void pci_release_selected_regions(struct pci_dev *, int);
+bool pci_wait_for_link(struct pci_dev *pdev, bool active);
I don't think this needs to be available outside the PCI core, so this
could probably be declared in drivers/pci/pci.h
thanks, will move it.
/* drivers/pci/bus.c */
struct pci_bus *pci_bus_get(struct pci_bus *bus);
--
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