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pcie: fast unplug when slot power is off

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In case the slot is powered off (and the power indicator turned off too)
we can unplug right away, without round-trip to the guest.

Also clear pending attention button press, there is nothing to care
about any more.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Message-Id: <20211111130859.1171890-6-kraxel@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Gerd Hoffmann 2021-11-11 14:08:58 +01:00 committed by Michael S. Tsirkin
parent 44242d4d3d
commit 0d33415a4e
1 changed files with 10 additions and 0 deletions
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10
hw/pci/pcie.c
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@ -560,6 +560,16 @@ void pcie_cap_slot_unplug_request_cb(HotplugHandler *hotplug_dev,
return;
}
if (((sltctl & PCI_EXP_SLTCTL_PIC) == PCI_EXP_SLTCTL_PWR_IND_OFF) &&
((sltctl & PCI_EXP_SLTCTL_PCC) == PCI_EXP_SLTCTL_PWR_OFF)) {
/* slot is powered off -> unplug without round-trip to the guest */
pcie_cap_slot_do_unplug(hotplug_pdev);
hotplug_event_notify(hotplug_pdev);
pci_word_test_and_clear_mask(exp_cap + PCI_EXP_SLTSTA,
PCI_EXP_SLTSTA_ABP);
return;
}
pcie_cap_slot_push_attention_button(hotplug_pdev);
}