The (OPAL) firmware might provide the PCI slot reset capability
which is identified by property "ibm,reset-by-firmware" on the
PCI slot associated device node.
This routes the reset request to firmware if "ibm,reset-by-firmware"
exists in the PCI slot device node. Otherwise, the reset is done
inside kernel as before.
Signed-off-by: Gavin Shan <gwshan@xxxxxxxxxxxxxxxxxx>
---
arch/powerpc/platforms/powernv/eeh-powernv.c | 41 +++++++++++++++++++++++++++-
1 file changed, 40 insertions(+), 1 deletion(-)
diff --git a/arch/powerpc/platforms/powernv/eeh-powernv.c b/arch/powerpc/platforms/powernv/eeh-powernv.c
index 3b17033..1ea78e5 100644
--- a/arch/powerpc/platforms/powernv/eeh-powernv.c
+++ b/arch/powerpc/platforms/powernv/eeh-powernv.c
@@ -36,6 +36,7 @@
#include <asm/msi_bitmap.h>
#include <asm/opal.h>
#include <asm/ppc-pci.h>
+#include <asm/pnv-pci.h>
#include "powernv.h"
#include "pci.h"
@@ -815,7 +816,7 @@ out:
return 0;
}
-static int pnv_eeh_bridge_reset(struct pci_dev *dev, int option)
+static int __pnv_eeh_bridge_reset(struct pci_dev *dev, int option)
{
struct pci_dn *pdn = pci_get_pdn_by_devfn(dev->bus, dev->devfn);
struct eeh_dev *edev = pdn_to_eeh_dev(pdn);
@@ -866,6 +867,44 @@ static int pnv_eeh_bridge_reset(struct pci_dev *dev, int option)
return 0;
}
+static int pnv_eeh_bridge_reset(struct pci_dev *pdev, int option)
+{
+ struct pci_controller *hose = pci_bus_to_host(pdev->bus);
+ struct pnv_phb *phb = hose->private_data;
+ struct device_node *dn = pci_device_to_OF_node(pdev);
+ uint64_t id = PCI_SLOT_ID(phb->opal_id,
+ (pdev->bus->number << 8) | pdev->devfn);
+ uint8_t scope;
+ int64_t rc;
+
+ /* Hot reset to the bus if firmware cannot handle */
+ if (!dn || !of_get_property(dn, "ibm,reset-by-firmware", NULL))
+ return __pnv_eeh_bridge_reset(pdev, option);
+
+ switch (option) {
+ case EEH_RESET_FUNDAMENTAL:
+ scope = OPAL_RESET_PCI_FUNDAMENTAL;
+ break;
+ case EEH_RESET_HOT:
+ scope = OPAL_RESET_PCI_HOT;
+ break;
+ case EEH_RESET_DEACTIVATE:
+ return 0;
+ default:
+ dev_dbg(&pdev->dev, "%s: Unsupported reset %d\n",
+ __func__, option);
+ return -EINVAL;
+ }
+
+ rc = opal_pci_reset(id, scope, OPAL_ASSERT_RESET);
+ if (rc <= OPAL_SUCCESS)
+ goto out;
+
+ rc = pnv_eeh_poll(id);
+out:
+ return (rc == OPAL_SUCCESS) ? 0 : -EIO;
+}
+
void pnv_pci_reset_secondary_bus(struct pci_dev *dev)
{
pnv_eeh_bridge_reset(dev, EEH_RESET_HOT);
--
2.1.0
--
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