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pci-hotplug/pnv_php: Add a reset_slot() callback 

When performing EEH recovery of devices in a hotplug slot we need to use
the slot driver's ->reset_slot() callback to prevent spurious hotplug
events due to spurious DLActive and PresDet change interrupts. Add a
reset_slot() callback to pnv_php so we can handle recovery of devices
in pnv_php managed slots.

Signed-off-by: Oliver O'Halloran <oohall@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20190903101605.2890-9-oohall@gmail.com
This commit is contained in:
Oliver O'Halloran 2019-09-03 20:15:59 +10:00 committed by Michael Ellerman
parent 98fd32cde5
commit 7fd1fe4e48
1 changed files with 39 additions and 0 deletions
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39
drivers/pci/hotplug/pnv_php.c
View File

@ -511,6 +511,37 @@ static int pnv_php_enable(struct pnv_php_slot *php_slot, bool rescan)
return 0;
}
static int pnv_php_reset_slot(struct hotplug_slot *slot, int probe)
{
struct pnv_php_slot *php_slot = to_pnv_php_slot(slot);
struct pci_dev *bridge = php_slot->pdev;
uint16_t sts;
/*
* The CAPI folks want pnv_php to drive OpenCAPI slots
* which don't have a bridge. Only claim to support
* reset_slot() if we have a bridge device (for now...)
*/
if (probe)
return !bridge;
/* mask our interrupt while resetting the bridge */
if (php_slot->irq > 0)
disable_irq(php_slot->irq);
pci_bridge_secondary_bus_reset(bridge);
/* clear any state changes that happened due to the reset */
pcie_capability_read_word(php_slot->pdev, PCI_EXP_SLTSTA, &sts);
sts &= (PCI_EXP_SLTSTA_PDC | PCI_EXP_SLTSTA_DLLSC);
pcie_capability_write_word(php_slot->pdev, PCI_EXP_SLTSTA, sts);
if (php_slot->irq > 0)
enable_irq(php_slot->irq);
return 0;
}
static int pnv_php_enable_slot(struct hotplug_slot *slot)
{
struct pnv_php_slot *php_slot = to_pnv_php_slot(slot);
@ -548,6 +579,7 @@ static const struct hotplug_slot_ops php_slot_ops = {
.set_attention_status = pnv_php_set_attention_state,
.enable_slot = pnv_php_enable_slot,
.disable_slot = pnv_php_disable_slot,
.reset_slot = pnv_php_reset_slot,
};
static void pnv_php_release(struct pnv_php_slot *php_slot)
@ -721,6 +753,12 @@ static irqreturn_t pnv_php_interrupt(int irq, void *data)
pcie_capability_read_word(pdev, PCI_EXP_SLTSTA, &sts);
sts &= (PCI_EXP_SLTSTA_PDC | PCI_EXP_SLTSTA_DLLSC);
pcie_capability_write_word(pdev, PCI_EXP_SLTSTA, sts);
pci_dbg(pdev, "PCI slot [%s]: HP int! DLAct: %d, PresDet: %d\n",
php_slot->name,
!!(sts & PCI_EXP_SLTSTA_DLLSC),
!!(sts & PCI_EXP_SLTSTA_PDC));
if (sts & PCI_EXP_SLTSTA_DLLSC) {
pcie_capability_read_word(pdev, PCI_EXP_LNKSTA, &lsts);
added = !!(lsts & PCI_EXP_LNKSTA_DLLLA);
@ -735,6 +773,7 @@ static irqreturn_t pnv_php_interrupt(int irq, void *data)
added = !!(presence == OPAL_PCI_SLOT_PRESENT);
} else {
pci_dbg(pdev, "PCI slot [%s]: Spurious IRQ?\n", php_slot->name);
return IRQ_NONE;
}