diff options
| author | Gerd Hoffmann <kraxel@redhat.com> | 2021-11-11 14:08:54 +0100 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2021-11-15 11:10:11 -0500 |
| commit | 23786d13441d36e0efcfee94ba8ff218746bed6c (patch) | |
| tree | 7e218be335b04fe0cf0f9b4e8bb726431ae0dc4f /hw/pci/pci_host.c | |
| parent | c829540401f280f0cad24131f4e7b92e81d506fa (diff) | |
| download | qemu-23786d13441d36e0efcfee94ba8ff218746bed6c.zip qemu-23786d13441d36e0efcfee94ba8ff218746bed6c.tar.gz qemu-23786d13441d36e0efcfee94ba8ff218746bed6c.tar.bz2 | |
pci: implement power state
This allows to power off pci devices. In "off" state the devices will
not be visible. No pci config space access, no pci bar access, no dma.
Default state is "on", so this patch (alone) should not change behavior.
Use case: Allows hotplug controllers implement slot power. Hotplug
controllers doing so should set the inital power state for devices in
the ->plug callback.
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Message-Id: <20211111130859.1171890-2-kraxel@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Diffstat (limited to 'hw/pci/pci_host.c')
| -rw-r--r-- | hw/pci/pci_host.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/hw/pci/pci_host.c b/hw/pci/pci_host.c index cf02f0d..7beafd4 100644 --- a/hw/pci/pci_host.c +++ b/hw/pci/pci_host.c @@ -74,7 +74,8 @@ void pci_host_config_write_common(PCIDevice *pci_dev, uint32_t addr, /* non-zero functions are only exposed when function 0 is present, * allowing direct removal of unexposed functions. */ - if (pci_dev->qdev.hotplugged && !pci_get_function_0(pci_dev)) { + if ((pci_dev->qdev.hotplugged && !pci_get_function_0(pci_dev)) || + !pci_dev->has_power) { return; } @@ -97,7 +98,8 @@ uint32_t pci_host_config_read_common(PCIDevice *pci_dev, uint32_t addr, /* non-zero functions are only exposed when function 0 is present, * allowing direct removal of unexposed functions. */ - if (pci_dev->qdev.hotplugged && !pci_get_function_0(pci_dev)) { + if ((pci_dev->qdev.hotplugged && !pci_get_function_0(pci_dev)) || + !pci_dev->has_power) { return ~0x0; } |