diff mbox series

pcie: set link state inactive/active after hot unplug/plug

Message ID 20181203070517.22668-1-zhengxiang9@huawei.com
State New
Headers show
Series pcie: set link state inactive/active after hot unplug/plug | expand

Commit Message

Xiang Zheng Dec. 3, 2018, 7:05 a.m. UTC 
When VM boots from the latest version of linux kernel, after
hot-unpluging virtio-blk disks which are hotplugged into
pcie-root-port, the VM's dmesg log shows:

[  151.046242] pciehp 0000:00:05.0:pcie004: pending interrupts 0x0001 from Slot Status
[  151.046365] pciehp 0000:00:05.0:pcie004: Slot(0-3): Attention button pressed
[  151.046369] pciehp 0000:00:05.0:pcie004: Slot(0-3): Powering off due to button press
[  151.046420] pciehp 0000:00:05.0:pcie004: pending interrupts 0x0010 from Slot Status
[  151.046425] pciehp 0000:00:05.0:pcie004: pciehp_green_led_blink: SLOTCTRL a8 write cmd 200
[  151.046464] pciehp 0000:00:05.0:pcie004: pending interrupts 0x0010 from Slot Status
[  151.046468] pciehp 0000:00:05.0:pcie004: pciehp_set_attention_status: SLOTCTRL a8 write cmd c0
[  156.163421] pciehp 0000:00:05.0:pcie004: pciehp_get_power_status: SLOTCTRL a8 value read 2f1
[  156.163427] pciehp 0000:00:05.0:pcie004: pciehp_unconfigure_device: domain:bus:dev = 0000:06:00
[  156.198736] pciehp 0000:00:05.0:pcie004: pending interrupts 0x0010 from Slot Status
[  156.198772] pciehp 0000:00:05.0:pcie004: pciehp_power_off_slot: SLOTCTRL a8 write cmd 400
[  157.224124] pciehp 0000:00:05.0:pcie004: pending interrupts 0x0018 from Slot Status
[  157.224194] pciehp 0000:00:05.0:pcie004: pciehp_green_led_off: SLOTCTRL a8 write cmd 300
[  157.224220] pciehp 0000:00:05.0:pcie004: pciehp_check_link_active: lnk_status = 2011
[  157.224223] pciehp 0000:00:05.0:pcie004: Slot(0-3): Link Up
[  157.224233] pciehp 0000:00:05.0:pcie004: pciehp_get_power_status: SLOTCTRL a8 value read 7f1
[  157.224281] pciehp 0000:00:05.0:pcie004: pending interrupts 0x0010 from Slot Status
[  157.224285] pciehp 0000:00:05.0:pcie004: pciehp_power_on_slot: SLOTCTRL a8 write cmd 0
[  157.224300] pciehp 0000:00:05.0:pcie004: __pciehp_link_set: lnk_ctrl = 0
[  157.224336] pciehp 0000:00:05.0:pcie004: pending interrupts 0x0010 from Slot Status
[  157.224339] pciehp 0000:00:05.0:pcie004: pciehp_green_led_blink: SLOTCTRL a8 write cmd 200
[  159.739294] pci 0000:06:00.0 id reading try 50 times with interval 20 ms to get ffffffff
[  159.739315] pciehp 0000:00:05.0:pcie004: pciehp_check_link_status: lnk_status = 2011
[  159.739318] pciehp 0000:00:05.0:pcie004: Failed to check link status
[  159.739371] pciehp 0000:00:05.0:pcie004: pending interrupts 0x0010 from Slot Status
[  159.739394] pciehp 0000:00:05.0:pcie004: pciehp_power_off_slot: SLOTCTRL a8 write cmd 400
[  160.771426] pciehp 0000:00:05.0:pcie004: pending interrupts 0x0010 from Slot Status
[  160.771452] pciehp 0000:00:05.0:pcie004: pciehp_green_led_off: SLOTCTRL a8 write cmd 300
[  160.771495] pciehp 0000:00:05.0:pcie004: pending interrupts 0x0010 from Slot Status
[  160.771499] pciehp 0000:00:05.0:pcie004: pciehp_set_attention_status: SLOTCTRL a8 write cmd 40
[  160.771535] pciehp 0000:00:05.0:pcie004: pending interrupts 0x0010 from Slot Status
[  160.771539] pciehp 0000:00:05.0:pcie004: pciehp_green_led_off: SLOTCTRL a8 write cmd 300

After analyzing the log information, it seems that qemu doesn't
change the Link Status from active to inactive after hot-unplug.
This results in the abnormal log after the linux kernel commit
d331710ea78fea merged.

Furthermore, If I hotplug the same virtio-blk disk after hot-unplug,
the virtio-blk would turn on and then back off.

So this patch set the Link Status inactive after hot-unplug and
active after hot-plug.

Signed-off-by: Zheng Xiang <zhengxiang9@huawei.com>
Signed-off-by: Zheng Xiang <xiang.zheng@linaro.org>
Cc: Wang Haibin <wanghaibin.wang@huawei.com>
---
 hw/pci/pcie.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

Comments

Marcel Apfelbaum Dec. 5, 2018, 6:23 a.m. UTC | #1 
On 12/3/18 9:05 AM, Zheng Xiang wrote:
> When VM boots from the latest version of linux kernel, after
> hot-unpluging virtio-blk disks which are hotplugged into
> pcie-root-port, the VM's dmesg log shows:
>
> [  151.046242] pciehp 0000:00:05.0:pcie004: pending interrupts 0x0001 from Slot Status
> [  151.046365] pciehp 0000:00:05.0:pcie004: Slot(0-3): Attention button pressed
> [  151.046369] pciehp 0000:00:05.0:pcie004: Slot(0-3): Powering off due to button press
> [  151.046420] pciehp 0000:00:05.0:pcie004: pending interrupts 0x0010 from Slot Status
> [  151.046425] pciehp 0000:00:05.0:pcie004: pciehp_green_led_blink: SLOTCTRL a8 write cmd 200
> [  151.046464] pciehp 0000:00:05.0:pcie004: pending interrupts 0x0010 from Slot Status
> [  151.046468] pciehp 0000:00:05.0:pcie004: pciehp_set_attention_status: SLOTCTRL a8 write cmd c0
> [  156.163421] pciehp 0000:00:05.0:pcie004: pciehp_get_power_status: SLOTCTRL a8 value read 2f1
> [  156.163427] pciehp 0000:00:05.0:pcie004: pciehp_unconfigure_device: domain:bus:dev = 0000:06:00
> [  156.198736] pciehp 0000:00:05.0:pcie004: pending interrupts 0x0010 from Slot Status
> [  156.198772] pciehp 0000:00:05.0:pcie004: pciehp_power_off_slot: SLOTCTRL a8 write cmd 400
> [  157.224124] pciehp 0000:00:05.0:pcie004: pending interrupts 0x0018 from Slot Status
> [  157.224194] pciehp 0000:00:05.0:pcie004: pciehp_green_led_off: SLOTCTRL a8 write cmd 300
> [  157.224220] pciehp 0000:00:05.0:pcie004: pciehp_check_link_active: lnk_status = 2011
> [  157.224223] pciehp 0000:00:05.0:pcie004: Slot(0-3): Link Up
> [  157.224233] pciehp 0000:00:05.0:pcie004: pciehp_get_power_status: SLOTCTRL a8 value read 7f1
> [  157.224281] pciehp 0000:00:05.0:pcie004: pending interrupts 0x0010 from Slot Status
> [  157.224285] pciehp 0000:00:05.0:pcie004: pciehp_power_on_slot: SLOTCTRL a8 write cmd 0
> [  157.224300] pciehp 0000:00:05.0:pcie004: __pciehp_link_set: lnk_ctrl = 0
> [  157.224336] pciehp 0000:00:05.0:pcie004: pending interrupts 0x0010 from Slot Status
> [  157.224339] pciehp 0000:00:05.0:pcie004: pciehp_green_led_blink: SLOTCTRL a8 write cmd 200
> [  159.739294] pci 0000:06:00.0 id reading try 50 times with interval 20 ms to get ffffffff
> [  159.739315] pciehp 0000:00:05.0:pcie004: pciehp_check_link_status: lnk_status = 2011
> [  159.739318] pciehp 0000:00:05.0:pcie004: Failed to check link status
> [  159.739371] pciehp 0000:00:05.0:pcie004: pending interrupts 0x0010 from Slot Status
> [  159.739394] pciehp 0000:00:05.0:pcie004: pciehp_power_off_slot: SLOTCTRL a8 write cmd 400
> [  160.771426] pciehp 0000:00:05.0:pcie004: pending interrupts 0x0010 from Slot Status
> [  160.771452] pciehp 0000:00:05.0:pcie004: pciehp_green_led_off: SLOTCTRL a8 write cmd 300
> [  160.771495] pciehp 0000:00:05.0:pcie004: pending interrupts 0x0010 from Slot Status
> [  160.771499] pciehp 0000:00:05.0:pcie004: pciehp_set_attention_status: SLOTCTRL a8 write cmd 40
> [  160.771535] pciehp 0000:00:05.0:pcie004: pending interrupts 0x0010 from Slot Status
> [  160.771539] pciehp 0000:00:05.0:pcie004: pciehp_green_led_off: SLOTCTRL a8 write cmd 300
>
> After analyzing the log information, it seems that qemu doesn't
> change the Link Status from active to inactive after hot-unplug.
> This results in the abnormal log after the linux kernel commit
> d331710ea78fea merged.
>
> Furthermore, If I hotplug the same virtio-blk disk after hot-unplug,
> the virtio-blk would turn on and then back off.
>
> So this patch set the Link Status inactive after hot-unplug and
> active after hot-plug.
>
> Signed-off-by: Zheng Xiang <zhengxiang9@huawei.com>
> Signed-off-by: Zheng Xiang <xiang.zheng@linaro.org>
> Cc: Wang Haibin <wanghaibin.wang@huawei.com>
> ---
>   hw/pci/pcie.c | 12 ++++++++++++
>   1 file changed, 12 insertions(+)
>
> diff --git a/hw/pci/pcie.c b/hw/pci/pcie.c
> index 6c91bd4..66b73b8 100644
> --- a/hw/pci/pcie.c
> +++ b/hw/pci/pcie.c
> @@ -345,6 +345,10 @@ void pcie_cap_slot_hotplug_cb(HotplugHandler *hotplug_dev, DeviceState *dev,
>       if (!dev->hotplugged) {
>           pci_word_test_and_set_mask(exp_cap + PCI_EXP_SLTSTA,
>                                      PCI_EXP_SLTSTA_PDS);
> +        if (pci_dev->cap_present & QEMU_PCIE_LNKSTA_DLLLA) {
> +            pci_word_test_and_set_mask(exp_cap + PCI_EXP_LNKSTA,
> +                                       PCI_EXP_LNKSTA_DLLLA);
> +        }
>           return;
>       }
>   
> @@ -355,6 +359,10 @@ void pcie_cap_slot_hotplug_cb(HotplugHandler *hotplug_dev, DeviceState *dev,
>       if (pci_get_function_0(pci_dev)) {
>           pci_word_test_and_set_mask(exp_cap + PCI_EXP_SLTSTA,
>                                      PCI_EXP_SLTSTA_PDS);
> +        if (pci_dev->cap_present & QEMU_PCIE_LNKSTA_DLLLA) {
> +            pci_word_test_and_set_mask(exp_cap + PCI_EXP_LNKSTA,
> +                                       PCI_EXP_LNKSTA_DLLLA);
> +        }
>           pcie_cap_slot_event(PCI_DEVICE(hotplug_dev),
>                               PCI_EXP_HP_EV_PDC | PCI_EXP_HP_EV_ABP);
>       }
> @@ -531,6 +539,10 @@ void pcie_cap_slot_write_config(PCIDevice *dev,
>   
>           pci_word_test_and_clear_mask(exp_cap + PCI_EXP_SLTSTA,
>                                        PCI_EXP_SLTSTA_PDS);
> +        if (dev->cap_present & QEMU_PCIE_LNKSTA_DLLLA) {
> +            pci_word_test_and_clear_mask(exp_cap + PCI_EXP_LNKSTA,
> +                                         PCI_EXP_LNKSTA_DLLLA);
> +        }
>           pci_word_test_and_set_mask(exp_cap + PCI_EXP_SLTSTA,
>                                          PCI_EXP_SLTSTA_PDC);
>       }

Looks good to me,

Reviewed-by: Marcel Apfelbaum<marcel.apfelbaum@gmail.com>
Thanks,
Marcel
Michael S. Tsirkin Dec. 18, 2018, 2:18 a.m. UTC | #2 
On Wed, Dec 05, 2018 at 08:23:35AM +0200, Marcel Apfelbaum wrote:
> 
> 
> On 12/3/18 9:05 AM, Zheng Xiang wrote:
> > When VM boots from the latest version of linux kernel, after
> > hot-unpluging virtio-blk disks which are hotplugged into
> > pcie-root-port, the VM's dmesg log shows:
> > 
> > [  151.046242] pciehp 0000:00:05.0:pcie004: pending interrupts 0x0001 from Slot Status
> > [  151.046365] pciehp 0000:00:05.0:pcie004: Slot(0-3): Attention button pressed
> > [  151.046369] pciehp 0000:00:05.0:pcie004: Slot(0-3): Powering off due to button press
> > [  151.046420] pciehp 0000:00:05.0:pcie004: pending interrupts 0x0010 from Slot Status
> > [  151.046425] pciehp 0000:00:05.0:pcie004: pciehp_green_led_blink: SLOTCTRL a8 write cmd 200
> > [  151.046464] pciehp 0000:00:05.0:pcie004: pending interrupts 0x0010 from Slot Status
> > [  151.046468] pciehp 0000:00:05.0:pcie004: pciehp_set_attention_status: SLOTCTRL a8 write cmd c0
> > [  156.163421] pciehp 0000:00:05.0:pcie004: pciehp_get_power_status: SLOTCTRL a8 value read 2f1
> > [  156.163427] pciehp 0000:00:05.0:pcie004: pciehp_unconfigure_device: domain:bus:dev = 0000:06:00
> > [  156.198736] pciehp 0000:00:05.0:pcie004: pending interrupts 0x0010 from Slot Status
> > [  156.198772] pciehp 0000:00:05.0:pcie004: pciehp_power_off_slot: SLOTCTRL a8 write cmd 400
> > [  157.224124] pciehp 0000:00:05.0:pcie004: pending interrupts 0x0018 from Slot Status
> > [  157.224194] pciehp 0000:00:05.0:pcie004: pciehp_green_led_off: SLOTCTRL a8 write cmd 300
> > [  157.224220] pciehp 0000:00:05.0:pcie004: pciehp_check_link_active: lnk_status = 2011
> > [  157.224223] pciehp 0000:00:05.0:pcie004: Slot(0-3): Link Up
> > [  157.224233] pciehp 0000:00:05.0:pcie004: pciehp_get_power_status: SLOTCTRL a8 value read 7f1
> > [  157.224281] pciehp 0000:00:05.0:pcie004: pending interrupts 0x0010 from Slot Status
> > [  157.224285] pciehp 0000:00:05.0:pcie004: pciehp_power_on_slot: SLOTCTRL a8 write cmd 0
> > [  157.224300] pciehp 0000:00:05.0:pcie004: __pciehp_link_set: lnk_ctrl = 0
> > [  157.224336] pciehp 0000:00:05.0:pcie004: pending interrupts 0x0010 from Slot Status
> > [  157.224339] pciehp 0000:00:05.0:pcie004: pciehp_green_led_blink: SLOTCTRL a8 write cmd 200
> > [  159.739294] pci 0000:06:00.0 id reading try 50 times with interval 20 ms to get ffffffff
> > [  159.739315] pciehp 0000:00:05.0:pcie004: pciehp_check_link_status: lnk_status = 2011
> > [  159.739318] pciehp 0000:00:05.0:pcie004: Failed to check link status
> > [  159.739371] pciehp 0000:00:05.0:pcie004: pending interrupts 0x0010 from Slot Status
> > [  159.739394] pciehp 0000:00:05.0:pcie004: pciehp_power_off_slot: SLOTCTRL a8 write cmd 400
> > [  160.771426] pciehp 0000:00:05.0:pcie004: pending interrupts 0x0010 from Slot Status
> > [  160.771452] pciehp 0000:00:05.0:pcie004: pciehp_green_led_off: SLOTCTRL a8 write cmd 300
> > [  160.771495] pciehp 0000:00:05.0:pcie004: pending interrupts 0x0010 from Slot Status
> > [  160.771499] pciehp 0000:00:05.0:pcie004: pciehp_set_attention_status: SLOTCTRL a8 write cmd 40
> > [  160.771535] pciehp 0000:00:05.0:pcie004: pending interrupts 0x0010 from Slot Status
> > [  160.771539] pciehp 0000:00:05.0:pcie004: pciehp_green_led_off: SLOTCTRL a8 write cmd 300
> > 
> > After analyzing the log information, it seems that qemu doesn't
> > change the Link Status from active to inactive after hot-unplug.
> > This results in the abnormal log after the linux kernel commit
> > d331710ea78fea merged.
> > 
> > Furthermore, If I hotplug the same virtio-blk disk after hot-unplug,
> > the virtio-blk would turn on and then back off.
> > 
> > So this patch set the Link Status inactive after hot-unplug and
> > active after hot-plug.
> > 
> > Signed-off-by: Zheng Xiang <zhengxiang9@huawei.com>
> > Signed-off-by: Zheng Xiang <xiang.zheng@linaro.org>
> > Cc: Wang Haibin <wanghaibin.wang@huawei.com>
> > ---
> >   hw/pci/pcie.c | 12 ++++++++++++
> >   1 file changed, 12 insertions(+)
> > 
> > diff --git a/hw/pci/pcie.c b/hw/pci/pcie.c
> > index 6c91bd4..66b73b8 100644
> > --- a/hw/pci/pcie.c
> > +++ b/hw/pci/pcie.c
> > @@ -345,6 +345,10 @@ void pcie_cap_slot_hotplug_cb(HotplugHandler *hotplug_dev, DeviceState *dev,
> >       if (!dev->hotplugged) {
> >           pci_word_test_and_set_mask(exp_cap + PCI_EXP_SLTSTA,
> >                                      PCI_EXP_SLTSTA_PDS);
> > +        if (pci_dev->cap_present & QEMU_PCIE_LNKSTA_DLLLA) {
> > +            pci_word_test_and_set_mask(exp_cap + PCI_EXP_LNKSTA,
> > +                                       PCI_EXP_LNKSTA_DLLLA);
> > +        }
> >           return;
> >       }
> > @@ -355,6 +359,10 @@ void pcie_cap_slot_hotplug_cb(HotplugHandler *hotplug_dev, DeviceState *dev,
> >       if (pci_get_function_0(pci_dev)) {
> >           pci_word_test_and_set_mask(exp_cap + PCI_EXP_SLTSTA,
> >                                      PCI_EXP_SLTSTA_PDS);
> > +        if (pci_dev->cap_present & QEMU_PCIE_LNKSTA_DLLLA) {
> > +            pci_word_test_and_set_mask(exp_cap + PCI_EXP_LNKSTA,
> > +                                       PCI_EXP_LNKSTA_DLLLA);
> > +        }
> >           pcie_cap_slot_event(PCI_DEVICE(hotplug_dev),
> >                               PCI_EXP_HP_EV_PDC | PCI_EXP_HP_EV_ABP);
> >       }
> > @@ -531,6 +539,10 @@ void pcie_cap_slot_write_config(PCIDevice *dev,
> >           pci_word_test_and_clear_mask(exp_cap + PCI_EXP_SLTSTA,
> >                                        PCI_EXP_SLTSTA_PDS);
> > +        if (dev->cap_present & QEMU_PCIE_LNKSTA_DLLLA) {
> > +            pci_word_test_and_clear_mask(exp_cap + PCI_EXP_LNKSTA,
> > +                                         PCI_EXP_LNKSTA_DLLLA);
> > +        }
> >           pci_word_test_and_set_mask(exp_cap + PCI_EXP_SLTSTA,
> >                                          PCI_EXP_SLTSTA_PDC);
> >       }
> 
> Looks good to me,
> 
> Reviewed-by: Marcel Apfelbaum<marcel.apfelbaum@gmail.com>
> Thanks,
> Marcel
> 
> 

Marcel you need to fix your signature. I can't use it without
a space before <.

Thanks!
Marcel Apfelbaum Dec. 18, 2018, 1:59 p.m. UTC | #3 
On 12/18/18 4:18 AM, Michael S. Tsirkin wrote:
> On Wed, Dec 05, 2018 at 08:23:35AM +0200, Marcel Apfelbaum wrote:
>>
>> On 12/3/18 9:05 AM, Zheng Xiang wrote:
>>> When VM boots from the latest version of linux kernel, after
>>> hot-unpluging virtio-blk disks which are hotplugged into
>>> pcie-root-port, the VM's dmesg log shows:
>>>
>>> [  151.046242] pciehp 0000:00:05.0:pcie004: pending interrupts 0x0001 from Slot Status
>>> [  151.046365] pciehp 0000:00:05.0:pcie004: Slot(0-3): Attention button pressed
>>> [  151.046369] pciehp 0000:00:05.0:pcie004: Slot(0-3): Powering off due to button press
>>> [  151.046420] pciehp 0000:00:05.0:pcie004: pending interrupts 0x0010 from Slot Status
>>> [  151.046425] pciehp 0000:00:05.0:pcie004: pciehp_green_led_blink: SLOTCTRL a8 write cmd 200
>>> [  151.046464] pciehp 0000:00:05.0:pcie004: pending interrupts 0x0010 from Slot Status
>>> [  151.046468] pciehp 0000:00:05.0:pcie004: pciehp_set_attention_status: SLOTCTRL a8 write cmd c0
>>> [  156.163421] pciehp 0000:00:05.0:pcie004: pciehp_get_power_status: SLOTCTRL a8 value read 2f1
>>> [  156.163427] pciehp 0000:00:05.0:pcie004: pciehp_unconfigure_device: domain:bus:dev = 0000:06:00
>>> [  156.198736] pciehp 0000:00:05.0:pcie004: pending interrupts 0x0010 from Slot Status
>>> [  156.198772] pciehp 0000:00:05.0:pcie004: pciehp_power_off_slot: SLOTCTRL a8 write cmd 400
>>> [  157.224124] pciehp 0000:00:05.0:pcie004: pending interrupts 0x0018 from Slot Status
>>> [  157.224194] pciehp 0000:00:05.0:pcie004: pciehp_green_led_off: SLOTCTRL a8 write cmd 300
>>> [  157.224220] pciehp 0000:00:05.0:pcie004: pciehp_check_link_active: lnk_status = 2011
>>> [  157.224223] pciehp 0000:00:05.0:pcie004: Slot(0-3): Link Up
>>> [  157.224233] pciehp 0000:00:05.0:pcie004: pciehp_get_power_status: SLOTCTRL a8 value read 7f1
>>> [  157.224281] pciehp 0000:00:05.0:pcie004: pending interrupts 0x0010 from Slot Status
>>> [  157.224285] pciehp 0000:00:05.0:pcie004: pciehp_power_on_slot: SLOTCTRL a8 write cmd 0
>>> [  157.224300] pciehp 0000:00:05.0:pcie004: __pciehp_link_set: lnk_ctrl = 0
>>> [  157.224336] pciehp 0000:00:05.0:pcie004: pending interrupts 0x0010 from Slot Status
>>> [  157.224339] pciehp 0000:00:05.0:pcie004: pciehp_green_led_blink: SLOTCTRL a8 write cmd 200
>>> [  159.739294] pci 0000:06:00.0 id reading try 50 times with interval 20 ms to get ffffffff
>>> [  159.739315] pciehp 0000:00:05.0:pcie004: pciehp_check_link_status: lnk_status = 2011
>>> [  159.739318] pciehp 0000:00:05.0:pcie004: Failed to check link status
>>> [  159.739371] pciehp 0000:00:05.0:pcie004: pending interrupts 0x0010 from Slot Status
>>> [  159.739394] pciehp 0000:00:05.0:pcie004: pciehp_power_off_slot: SLOTCTRL a8 write cmd 400
>>> [  160.771426] pciehp 0000:00:05.0:pcie004: pending interrupts 0x0010 from Slot Status
>>> [  160.771452] pciehp 0000:00:05.0:pcie004: pciehp_green_led_off: SLOTCTRL a8 write cmd 300
>>> [  160.771495] pciehp 0000:00:05.0:pcie004: pending interrupts 0x0010 from Slot Status
>>> [  160.771499] pciehp 0000:00:05.0:pcie004: pciehp_set_attention_status: SLOTCTRL a8 write cmd 40
>>> [  160.771535] pciehp 0000:00:05.0:pcie004: pending interrupts 0x0010 from Slot Status
>>> [  160.771539] pciehp 0000:00:05.0:pcie004: pciehp_green_led_off: SLOTCTRL a8 write cmd 300
>>>
>>> After analyzing the log information, it seems that qemu doesn't
>>> change the Link Status from active to inactive after hot-unplug.
>>> This results in the abnormal log after the linux kernel commit
>>> d331710ea78fea merged.
>>>
>>> Furthermore, If I hotplug the same virtio-blk disk after hot-unplug,
>>> the virtio-blk would turn on and then back off.
>>>
>>> So this patch set the Link Status inactive after hot-unplug and
>>> active after hot-plug.
>>>
>>> Signed-off-by: Zheng Xiang <zhengxiang9@huawei.com>
>>> Signed-off-by: Zheng Xiang <xiang.zheng@linaro.org>
>>> Cc: Wang Haibin <wanghaibin.wang@huawei.com>
>>> ---
>>>    hw/pci/pcie.c | 12 ++++++++++++
>>>    1 file changed, 12 insertions(+)
>>>
>>> diff --git a/hw/pci/pcie.c b/hw/pci/pcie.c
>>> index 6c91bd4..66b73b8 100644
>>> --- a/hw/pci/pcie.c
>>> +++ b/hw/pci/pcie.c
>>> @@ -345,6 +345,10 @@ void pcie_cap_slot_hotplug_cb(HotplugHandler *hotplug_dev, DeviceState *dev,
>>>        if (!dev->hotplugged) {
>>>            pci_word_test_and_set_mask(exp_cap + PCI_EXP_SLTSTA,
>>>                                       PCI_EXP_SLTSTA_PDS);
>>> +        if (pci_dev->cap_present & QEMU_PCIE_LNKSTA_DLLLA) {
>>> +            pci_word_test_and_set_mask(exp_cap + PCI_EXP_LNKSTA,
>>> +                                       PCI_EXP_LNKSTA_DLLLA);
>>> +        }
>>>            return;
>>>        }
>>> @@ -355,6 +359,10 @@ void pcie_cap_slot_hotplug_cb(HotplugHandler *hotplug_dev, DeviceState *dev,
>>>        if (pci_get_function_0(pci_dev)) {
>>>            pci_word_test_and_set_mask(exp_cap + PCI_EXP_SLTSTA,
>>>                                       PCI_EXP_SLTSTA_PDS);
>>> +        if (pci_dev->cap_present & QEMU_PCIE_LNKSTA_DLLLA) {
>>> +            pci_word_test_and_set_mask(exp_cap + PCI_EXP_LNKSTA,
>>> +                                       PCI_EXP_LNKSTA_DLLLA);
>>> +        }
>>>            pcie_cap_slot_event(PCI_DEVICE(hotplug_dev),
>>>                                PCI_EXP_HP_EV_PDC | PCI_EXP_HP_EV_ABP);
>>>        }
>>> @@ -531,6 +539,10 @@ void pcie_cap_slot_write_config(PCIDevice *dev,
>>>            pci_word_test_and_clear_mask(exp_cap + PCI_EXP_SLTSTA,
>>>                                         PCI_EXP_SLTSTA_PDS);
>>> +        if (dev->cap_present & QEMU_PCIE_LNKSTA_DLLLA) {
>>> +            pci_word_test_and_clear_mask(exp_cap + PCI_EXP_LNKSTA,
>>> +                                         PCI_EXP_LNKSTA_DLLLA);
>>> +        }
>>>            pci_word_test_and_set_mask(exp_cap + PCI_EXP_SLTSTA,
>>>                                           PCI_EXP_SLTSTA_PDC);
>>>        }
>> Looks good to me,
>>
>> Reviewed-by: Marcel Apfelbaum<marcel.apfelbaum@gmail.com>
>> Thanks,
>> Marcel
>>
>>
> Marcel you need to fix your signature. I can't use it without
> a space before <.

Ooops, sorry,
I'll take care of it.

Reviewed-by: Marcel Apfelbaum <marcel.apfelbaum@gmail.com>

Thanks,
Marcel



> Thanks!
>
diff mbox series

Patch

diff --git a/hw/pci/pcie.c b/hw/pci/pcie.c
index 6c91bd4..66b73b8 100644
--- a/hw/pci/pcie.c
+++ b/hw/pci/pcie.c
@@ -345,6 +345,10 @@  void pcie_cap_slot_hotplug_cb(HotplugHandler *hotplug_dev, DeviceState *dev,
     if (!dev->hotplugged) {
         pci_word_test_and_set_mask(exp_cap + PCI_EXP_SLTSTA,
                                    PCI_EXP_SLTSTA_PDS);
+        if (pci_dev->cap_present & QEMU_PCIE_LNKSTA_DLLLA) {
+            pci_word_test_and_set_mask(exp_cap + PCI_EXP_LNKSTA,
+                                       PCI_EXP_LNKSTA_DLLLA);
+        }
         return;
     }
 
@@ -355,6 +359,10 @@  void pcie_cap_slot_hotplug_cb(HotplugHandler *hotplug_dev, DeviceState *dev,
     if (pci_get_function_0(pci_dev)) {
         pci_word_test_and_set_mask(exp_cap + PCI_EXP_SLTSTA,
                                    PCI_EXP_SLTSTA_PDS);
+        if (pci_dev->cap_present & QEMU_PCIE_LNKSTA_DLLLA) {
+            pci_word_test_and_set_mask(exp_cap + PCI_EXP_LNKSTA,
+                                       PCI_EXP_LNKSTA_DLLLA);
+        }
         pcie_cap_slot_event(PCI_DEVICE(hotplug_dev),
                             PCI_EXP_HP_EV_PDC | PCI_EXP_HP_EV_ABP);
     }
@@ -531,6 +539,10 @@  void pcie_cap_slot_write_config(PCIDevice *dev,
 
         pci_word_test_and_clear_mask(exp_cap + PCI_EXP_SLTSTA,
                                      PCI_EXP_SLTSTA_PDS);
+        if (dev->cap_present & QEMU_PCIE_LNKSTA_DLLLA) {
+            pci_word_test_and_clear_mask(exp_cap + PCI_EXP_LNKSTA,
+                                         PCI_EXP_LNKSTA_DLLLA);
+        }
         pci_word_test_and_set_mask(exp_cap + PCI_EXP_SLTSTA,
                                        PCI_EXP_SLTSTA_PDC);
     }