Update Linux to v5.4.148
Sourced from [1]
[1] https://cdn.kernel.org/pub/linux/kernel/v5.x/linux-5.4.148.tar.gz
Change-Id: Ib3d26c5ba9b022e2e03533005c4fed4d7c30b61b
Signed-off-by: Olivier Deprez <olivier.deprez@arm.com>
diff --git a/drivers/pci/hotplug/pciehp_hpc.c b/drivers/pci/hotplug/pciehp_hpc.c
index 1a522c1..88b9967 100644
--- a/drivers/pci/hotplug/pciehp_hpc.c
+++ b/drivers/pci/hotplug/pciehp_hpc.c
@@ -201,17 +201,29 @@
pcie_do_write_cmd(ctrl, cmd, mask, false);
}
-bool pciehp_check_link_active(struct controller *ctrl)
+/**
+ * pciehp_check_link_active() - Is the link active
+ * @ctrl: PCIe hotplug controller
+ *
+ * Check whether the downstream link is currently active. Note it is
+ * possible that the card is removed immediately after this so the
+ * caller may need to take it into account.
+ *
+ * If the hotplug controller itself is not available anymore returns
+ * %-ENODEV.
+ */
+int pciehp_check_link_active(struct controller *ctrl)
{
struct pci_dev *pdev = ctrl_dev(ctrl);
u16 lnk_status;
- bool ret;
+ int ret;
- pcie_capability_read_word(pdev, PCI_EXP_LNKSTA, &lnk_status);
+ ret = pcie_capability_read_word(pdev, PCI_EXP_LNKSTA, &lnk_status);
+ if (ret == PCIBIOS_DEVICE_NOT_FOUND || lnk_status == (u16)~0)
+ return -ENODEV;
+
ret = !!(lnk_status & PCI_EXP_LNKSTA_DLLLA);
-
- if (ret)
- ctrl_dbg(ctrl, "%s: lnk_status = %x\n", __func__, lnk_status);
+ ctrl_dbg(ctrl, "%s: lnk_status = %x\n", __func__, lnk_status);
return ret;
}
@@ -373,13 +385,29 @@
*status = !!(slot_status & PCI_EXP_SLTSTA_MRLSS);
}
-bool pciehp_card_present(struct controller *ctrl)
+/**
+ * pciehp_card_present() - Is the card present
+ * @ctrl: PCIe hotplug controller
+ *
+ * Function checks whether the card is currently present in the slot and
+ * in that case returns true. Note it is possible that the card is
+ * removed immediately after the check so the caller may need to take
+ * this into account.
+ *
+ * It the hotplug controller itself is not available anymore returns
+ * %-ENODEV.
+ */
+int pciehp_card_present(struct controller *ctrl)
{
struct pci_dev *pdev = ctrl_dev(ctrl);
u16 slot_status;
+ int ret;
- pcie_capability_read_word(pdev, PCI_EXP_SLTSTA, &slot_status);
- return slot_status & PCI_EXP_SLTSTA_PDS;
+ ret = pcie_capability_read_word(pdev, PCI_EXP_SLTSTA, &slot_status);
+ if (ret == PCIBIOS_DEVICE_NOT_FOUND || slot_status == (u16)~0)
+ return -ENODEV;
+
+ return !!(slot_status & PCI_EXP_SLTSTA_PDS);
}
/**
@@ -390,10 +418,19 @@
* Presence Detect State bit, this helper also returns true if the Link Active
* bit is set. This is a concession to broken hotplug ports which hardwire
* Presence Detect State to zero, such as Wilocity's [1ae9:0200].
+ *
+ * Returns: %1 if the slot is occupied and %0 if it is not. If the hotplug
+ * port is not present anymore returns %-ENODEV.
*/
-bool pciehp_card_present_or_link_active(struct controller *ctrl)
+int pciehp_card_present_or_link_active(struct controller *ctrl)
{
- return pciehp_card_present(ctrl) || pciehp_check_link_active(ctrl);
+ int ret;
+
+ ret = pciehp_card_present(ctrl);
+ if (ret)
+ return ret;
+
+ return pciehp_check_link_active(ctrl);
}
int pciehp_query_power_fault(struct controller *ctrl)
@@ -492,7 +529,7 @@
struct controller *ctrl = (struct controller *)dev_id;
struct pci_dev *pdev = ctrl_dev(ctrl);
struct device *parent = pdev->dev.parent;
- u16 status, events;
+ u16 status, events = 0;
/*
* Interrupts only occur in D3hot or shallower and only if enabled
@@ -517,6 +554,7 @@
}
}
+read_status:
pcie_capability_read_word(pdev, PCI_EXP_SLTSTA, &status);
if (status == (u16) ~0) {
ctrl_info(ctrl, "%s: no response from device\n", __func__);
@@ -529,24 +567,37 @@
* Slot Status contains plain status bits as well as event
* notification bits; right now we only want the event bits.
*/
- events = status & (PCI_EXP_SLTSTA_ABP | PCI_EXP_SLTSTA_PFD |
- PCI_EXP_SLTSTA_PDC | PCI_EXP_SLTSTA_CC |
- PCI_EXP_SLTSTA_DLLSC);
+ status &= PCI_EXP_SLTSTA_ABP | PCI_EXP_SLTSTA_PFD |
+ PCI_EXP_SLTSTA_PDC | PCI_EXP_SLTSTA_CC |
+ PCI_EXP_SLTSTA_DLLSC;
/*
* If we've already reported a power fault, don't report it again
* until we've done something to handle it.
*/
if (ctrl->power_fault_detected)
- events &= ~PCI_EXP_SLTSTA_PFD;
+ status &= ~PCI_EXP_SLTSTA_PFD;
+ events |= status;
if (!events) {
if (parent)
pm_runtime_put(parent);
return IRQ_NONE;
}
- pcie_capability_write_word(pdev, PCI_EXP_SLTSTA, events);
+ if (status) {
+ pcie_capability_write_word(pdev, PCI_EXP_SLTSTA, events);
+
+ /*
+ * In MSI mode, all event bits must be zero before the port
+ * will send a new interrupt (PCIe Base Spec r5.0 sec 6.7.3.4).
+ * So re-read the Slot Status register in case a bit was set
+ * between read and write.
+ */
+ if (pci_dev_msi_enabled(pdev) && !pciehp_poll_mode)
+ goto read_status;
+ }
+
ctrl_dbg(ctrl, "pending interrupts %#06x from Slot Status\n", events);
if (parent)
pm_runtime_put(parent);
@@ -583,23 +634,22 @@
irqreturn_t ret;
u32 events;
+ ctrl->ist_running = true;
pci_config_pm_runtime_get(pdev);
/* rerun pciehp_isr() if the port was inaccessible on interrupt */
if (atomic_fetch_and(~RERUN_ISR, &ctrl->pending_events) & RERUN_ISR) {
ret = pciehp_isr(irq, dev_id);
enable_irq(irq);
- if (ret != IRQ_WAKE_THREAD) {
- pci_config_pm_runtime_put(pdev);
- return ret;
- }
+ if (ret != IRQ_WAKE_THREAD)
+ goto out;
}
synchronize_hardirq(irq);
events = atomic_xchg(&ctrl->pending_events, 0);
if (!events) {
- pci_config_pm_runtime_put(pdev);
- return IRQ_NONE;
+ ret = IRQ_NONE;
+ goto out;
}
/* Check Attention Button Pressed */
@@ -628,9 +678,12 @@
pciehp_handle_presence_or_link_change(ctrl, events);
up_read(&ctrl->reset_lock);
+ ret = IRQ_HANDLED;
+out:
pci_config_pm_runtime_put(pdev);
+ ctrl->ist_running = false;
wake_up(&ctrl->requester);
- return IRQ_HANDLED;
+ return ret;
}
static int pciehp_poll(void *data)