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Re: [Qemu-devel] [RFC v7 03/11] qdev: add bus reset_notifiers callbacks
From: |
Alex Williamson |
Subject: |
Re: [Qemu-devel] [RFC v7 03/11] qdev: add bus reset_notifiers callbacks for host bus reset |
Date: |
Tue, 19 May 2015 13:34:51 -0600 |
On Tue, 2015-05-19 at 12:42 +0800, Chen Fan wrote:
> Particularly, For vfio device, Once need to recovery devices
> by bus reset such as AER, we always need to reset the host bus
> to recovery the devices under the bus, so we need to add pci bus
> callbacks to specify to do host bus reset.
>
> Signed-off-by: Chen Fan <address@hidden>
> ---
> hw/pci/pci.c | 6 ++++++
> hw/pci/pci_bridge.c | 3 +++
> hw/vfio/pci.c | 12 ++++++++++++
> include/hw/pci/pci.h | 2 ++
> include/hw/pci/pci_bus.h | 2 ++
> include/hw/vfio/vfio-common.h | 1 +
> 6 files changed, 26 insertions(+)
>
> diff --git a/hw/pci/pci.c b/hw/pci/pci.c
> index 48f19a3..cac7769 100644
> --- a/hw/pci/pci.c
> +++ b/hw/pci/pci.c
> @@ -74,11 +74,17 @@ static const VMStateDescription vmstate_pcibus = {
> }
> };
>
> +void pci_bus_add_reset_notifier(PCIBus *bus, Notifier *notify)
> +{
> + notifier_list_add(&bus->reset_notifiers, notify);
> +}
> +
How do we support hot-unplug without a matching remove function?
> static void pci_bus_realize(BusState *qbus, Error **errp)
> {
> PCIBus *bus = PCI_BUS(qbus);
>
> vmstate_register(NULL, -1, &vmstate_pcibus, bus);
> + notifier_list_init(&bus->reset_notifiers);
> }
>
> static void pci_bus_unrealize(BusState *qbus, Error **errp)
> diff --git a/hw/pci/pci_bridge.c b/hw/pci/pci_bridge.c
> index 40c97b1..88c3240 100644
> --- a/hw/pci/pci_bridge.c
> +++ b/hw/pci/pci_bridge.c
> @@ -267,6 +267,9 @@ void pci_bridge_write_config(PCIDevice *d,
>
> newctl = pci_get_word(d->config + PCI_BRIDGE_CONTROL);
> if (~oldctl & newctl & PCI_BRIDGE_CTL_BUS_RESET) {
> + /* Particularly for vfio devices to reset host bus */
> + notifier_list_notify(&s->sec_bus.reset_notifiers, NULL);
> +
> /* Trigger hot reset on 0->1 transition. */
> qbus_reset_all(&s->sec_bus.qbus);
> }
> diff --git a/hw/vfio/pci.c b/hw/vfio/pci.c
vfio changes should be done in a separate patch, the QEMU PCI-core
changes would need to be ack'd by mst.
> index 037a2c6..43869e9 100644
> --- a/hw/vfio/pci.c
> +++ b/hw/vfio/pci.c
> @@ -154,6 +154,7 @@ typedef struct VFIOPCIDevice {
> PCIHostDeviceAddress host;
> EventNotifier err_notifier;
> EventNotifier req_notifier;
> + Notifier sec_bus_reset_notifier;
> int (*resetfn)(struct VFIOPCIDevice *);
> uint32_t features;
> #define VFIO_FEATURE_ENABLE_VGA_BIT 0
> @@ -3524,6 +3525,14 @@ static void vfio_setup_resetfn(VFIOPCIDevice *vdev)
> }
> }
>
> +static void vfio_pci_host_needs_bus_reset(Notifier *n, void *opaque)
> +{
> + VFIOPCIDevice *vdev = container_of(n, VFIOPCIDevice,
> sec_bus_reset_notifier);
> + VFIODevice *vbasedev = &vdev->vbasedev;
> +
> + vbasedev->needs_bus_reset = true;
> +}
> +
> static int vfio_initfn(PCIDevice *pdev)
> {
> VFIOPCIDevice *vdev = DO_UPCAST(VFIOPCIDevice, pdev, pdev);
> @@ -3674,6 +3683,9 @@ static int vfio_initfn(PCIDevice *pdev)
> vfio_register_req_notifier(vdev);
> vfio_setup_resetfn(vdev);
>
> + vdev->sec_bus_reset_notifier.notify = vfio_pci_host_needs_bus_reset;
> + pci_bus_add_reset_notifier(pdev->bus, &vdev->sec_bus_reset_notifier);
> +
The notifier obviously needs to be unregistered in the exitfn.
> return 0;
>
> out_teardown:
> diff --git a/include/hw/pci/pci.h b/include/hw/pci/pci.h
> index 5d050c8..eae236a 100644
> --- a/include/hw/pci/pci.h
> +++ b/include/hw/pci/pci.h
> @@ -7,6 +7,7 @@
> #include "exec/memory.h"
> #include "sysemu/dma.h"
> #include "qapi/error.h"
> +#include "qemu/notify.h"
>
> /* PCI includes legacy ISA access. */
> #include "hw/isa/isa.h"
> @@ -371,6 +372,7 @@ void pci_bus_fire_intx_routing_notifier(PCIBus *bus);
> void pci_device_set_intx_routing_notifier(PCIDevice *dev,
> PCIINTxRoutingNotifier notifier);
> void pci_device_reset(PCIDevice *dev);
> +void pci_bus_add_reset_notifier(PCIBus *bus, Notifier *notify);
>
> PCIDevice *pci_nic_init_nofail(NICInfo *nd, PCIBus *rootbus,
> const char *default_model,
> diff --git a/include/hw/pci/pci_bus.h b/include/hw/pci/pci_bus.h
> index fabaeee..3b551d7 100644
> --- a/include/hw/pci/pci_bus.h
> +++ b/include/hw/pci/pci_bus.h
> @@ -29,6 +29,8 @@ struct PCIBus {
> Keep a count of the number of devices with raised IRQs. */
> int nirq;
> int *irq_count;
> +
> + NotifierList reset_notifiers;
> };
>
> typedef struct PCIBridgeWindows PCIBridgeWindows;
> diff --git a/include/hw/vfio/vfio-common.h b/include/hw/vfio/vfio-common.h
> index 0d1fb80..5f5691a 100644
> --- a/include/hw/vfio/vfio-common.h
> +++ b/include/hw/vfio/vfio-common.h
> @@ -102,6 +102,7 @@ typedef struct VFIODevice {
> bool reset_works;
> bool needs_reset;
> bool allow_mmap;
> + bool needs_bus_reset;
This is PCI specific, it should be added to VFIOPCIDevice only.
> VFIODeviceOps *ops;
> unsigned int num_irqs;
> unsigned int num_regions;
- [Qemu-devel] [RFC v7 00/11] vfio-pci: pass the aer error to guest, Chen Fan, 2015/05/19
- [Qemu-devel] [RFC v7 03/11] qdev: add bus reset_notifiers callbacks for host bus reset, Chen Fan, 2015/05/19
- Re: [Qemu-devel] [RFC v7 03/11] qdev: add bus reset_notifiers callbacks for host bus reset,
Alex Williamson <=
- [Qemu-devel] [RFC v7 08/11] vfio: add aer support for vfio device, Chen Fan, 2015/05/19
- [Qemu-devel] [RFC v7 06/11] vfio: add pcie extanded capability support, Chen Fan, 2015/05/19
- [Qemu-devel] [RFC v7 07/11] aer: impove pcie_aer_init to support vfio device, Chen Fan, 2015/05/19
- [Qemu-devel] [RFC v7 09/11] pcie_aer: expose pcie_aer_msg() interface, Chen Fan, 2015/05/19
- [Qemu-devel] [RFC v7 05/11] vfio: do hot bus reset when do virtual secondary bus reset, Chen Fan, 2015/05/19
[Qemu-devel] [RFC v7 10/11] vfio-pci: pass the aer error to guest, Chen Fan, 2015/05/19
[Qemu-devel] [RFC v7 11/11] vfio: add 'aer' property to expose aercap, Chen Fan, 2015/05/19