[PATCH 2/5] s390/pci: implement reset_slot for hotplug slot

Niklas Schnelle
2021-09-06T09:49:44Z

This is done by adding a zpci_hot_reset_device() call which does a low
level reset of the PCI function without changing its higher level
function state. This way it can be used while the zPCI function is bound
to a driver and with DMA tables being controlled either through the
IOMMU or DMA APIs which is prohibited when using zpci_disable_device()
as that drop existing DMA translations.

As this reset, unlike a normal FLR, also calls zpci_clear_irq() we need
to implement arch_restore_msi_irqs() and make sure we re-enable IRQs for
the PCI function if they were previously disabled.

Signed-off-by: Niklas Schnelle <schnelle@linux.ibm.com>
---
arch/s390/include/asm/pci.h | 1 +
arch/s390/pci/pci.c | 58 ++++++++++++++++++++++++++++++
arch/s390/pci/pci_irq.c | 9 +++++
drivers/pci/hotplug/s390_pci_hpc.c | 24 +++++++++++++
4 files changed, 92 insertions(+)

diff --git a/arch/s390/include/asm/pci.h b/arch/s390/include/asm/pci.h
index 5e6cba22a801..2a2ed165a270 100644
--- a/arch/s390/include/asm/pci.h
+++ b/arch/s390/include/asm/pci.h
@@ -208,6 +208,7 @@ int zpci_disable_device(struct zpci_dev *);
int zpci_scan_configured_device(struct zpci_dev *zdev, u32 fh);
int zpci_deconfigure_device(struct zpci_dev *zdev);

+int zpci_hot_reset_device(struct zpci_dev *zdev);
int zpci_register_ioat(struct zpci_dev *, u8, u64, u64, u64);
int zpci_unregister_ioat(struct zpci_dev *, u8);
void zpci_remove_reserved_devices(void);
diff --git a/arch/s390/pci/pci.c b/arch/s390/pci/pci.c
index af22778551c1..a6322f45b5bd 100644
--- a/arch/s390/pci/pci.c
+++ b/arch/s390/pci/pci.c
@@ -723,6 +723,64 @@ int zpci_disable_device(struct zpci_dev *zdev)
return rc;
}

+/**
+ * zpci_hot_reset_device - perform a reset of the given zPCI function
+ * @zdev: the slot which should be reset
+ *
+ * Performs a low level reset of the zPCI function. The reset is low level in
+ * the sense that the zPCI function can be reset without detaching it from the
+ * common PCI subsystem. The reset may be performed while under control of
+ * either DMA or IOMMU APIs in which case the existing DMA/IOMMU translation
+ * table is reinstated at the end of the reset.
+ *
+ * After the reset the functions internal state is reset to an initial state
+ * equivalent to its state during boot when first probing a driver.
+ * Consequently after reset the PCI function requires re-initialization via the
+ * common PCI code including re-enabling IRQs via pci_alloc_irq_vectors()
+ * and enabling the function via e.g.pci_enablde_device_flags().The caller
+ * must guard against concurrent reset attempts.
+ *
+ * In most cases this function should not be called directly but through
+ * pci_reset_function() or pci_reset_bus() which handle the save/restore and
+ * locking.
+ *
+ * Return: 0 on success and an error value otherwise
+ */
+int zpci_hot_reset_device(struct zpci_dev *zdev)
+{
+ int rc;
+
+ zpci_dbg(3, "reset fid:%x\n", zdev->fid);
+ if (zdev_enabled(zdev)) {
+ /* Disables device access, DMAs and IRQs (reset state) */
+ rc = zpci_disable_device(zdev);
+ /*
+ * Due to a z/VM vs LPAR inconsistency in the error state the
+ * FH may indicate an enabled device but disable says the
+ * device is already disabled don't treat it as an error here.
+ */
+ if (rc == -EINVAL)
+ rc = 0;
+ if (rc)
+ return rc;
+ }
+
+ rc = zpci_enable_device(zdev);
+ if (rc)
+ return rc;
+
+ if (zdev->dma_table) {
+ rc = zpci_register_ioat(zdev, 0, zdev->start_dma, zdev->end_dma,
+ (u64)zdev->dma_table);
+ if (rc)
+ return rc;
+ } else {
+ zpci_dma_init_device(zdev);
+ }
+
+ return 0;
+}
+
/**
* zpci_create_device() - Create a new zpci_dev and add it to the zbus
* @fid: Function ID of the device to be created
diff --git a/arch/s390/pci/pci_irq.c b/arch/s390/pci/pci_irq.c
index 9c7de9089939..ab98e7f5b79b 100644
--- a/arch/s390/pci/pci_irq.c
+++ b/arch/s390/pci/pci_irq.c
@@ -391,6 +391,15 @@ void arch_teardown_msi_irqs(struct pci_dev *pdev)
airq_iv_free(zpci_ibv[0], zdev->msi_first_bit, zdev->msi_nr_irqs);
}

+void arch_restore_msi_irqs(struct pci_dev *pdev)
+{
+ struct zpci_dev *zdev = to_zpci(pdev);
+
+ if (!zdev->irqs_registered)
+ zpci_set_irq(zdev);
+ default_restore_msi_irqs(pdev);
+}
+
static struct airq_struct zpci_airq = {
.handler = zpci_floating_irq_handler,
.isc = PCI_ISC,
diff --git a/drivers/pci/hotplug/s390_pci_hpc.c b/drivers/pci/hotplug/s390_pci_hpc.c
index 014868752cd4..07f28db0eed5 100644
--- a/drivers/pci/hotplug/s390_pci_hpc.c
+++ b/drivers/pci/hotplug/s390_pci_hpc.c
@@ -57,6 +57,29 @@ static int disable_slot(struct hotplug_slot *hotplug_slot)
return zpci_deconfigure_device(zdev);
}

+static int reset_slot(struct hotplug_slot *hotplug_slot, int probe)
+{
+ struct zpci_dev *zdev = container_of(hotplug_slot, struct zpci_dev,
+ hotplug_slot);
+
+ if (zdev->state != ZPCI_FN_STATE_CONFIGURED)
+ return -EIO;
+ /*
+ * We can't take the zdev->lock as reset_slot may be called during
+ * probing and/or device removal which already happens under the
+ * zdev->lock. Instead the user should use the higher level
+ * pci_reset_function() or pci_bus_reset() which hold the PCI device
+ * lock preventing concurrent removal. If not using these functions
+ * holding the PCI device lock is required.
+ */
+
+ /* As long as the function is configured we can reset */
+ if (probe)
+ return 0;
+
+ return zpci_hot_reset_device(zdev);
+}
+
static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value)
{
struct zpci_dev *zdev = container_of(hotplug_slot, struct zpci_dev,
@@ -83,6 +106,7 @@ static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value)
static const struct hotplug_slot_ops s390_hotplug_slot_ops = {
.enable_slot = enable_slot,
.disable_slot = disable_slot,
+ .reset_slot = reset_slot,
.get_power_status = get_power_status,
.get_adapter_status = get_adapter_status,
};
--
2.25.1