Re: [PATCH v2 1/2] pcie: Don't try triggering a LSI when not defined

[Daniel Henrique Barboza]

On 4/8/22 10:13, Frederic Barrat wrote:
> This patch skips [de]asserting a LSI interrupt if the device doesn't
> have any LSI defined. Doing so would trigger an assert in
> pci_irq_handler().
>
> The PCIE root port implementation in qemu requests a LSI (INTA), but a
> subclass may want to change that behavior since it's a valid
> configuration. For example on the POWER8/POWER9/POWER10 systems, the
> root bridge doesn't request any LSI.
>
> Signed-off-by: Frederic Barrat <fbarrat@linux.ibm.com>
> ---

Reviewed-by: Daniel Henrique Barboza <danielhb413@gmail.com>

>   hw/pci/pcie.c     | 5 +++--
>   hw/pci/pcie_aer.c | 2 +-
>   2 files changed, 4 insertions(+), 3 deletions(-)
>
> diff --git a/hw/pci/pcie.c b/hw/pci/pcie.c
> index 67a5d67372..68a62da0b5 100644
> --- a/hw/pci/pcie.c
> +++ b/hw/pci/pcie.c
> @@ -353,7 +353,7 @@ static void hotplug_event_notify(PCIDevice *dev)
>           msix_notify(dev, pcie_cap_flags_get_vector(dev));
>       } else if (msi_enabled(dev)) {
>           msi_notify(dev, pcie_cap_flags_get_vector(dev));
> -    } else {
> +    } else if (pci_intx(dev) != -1) {
>           pci_set_irq(dev, dev->exp.hpev_notified);
>       }
>   }
> @@ -361,7 +361,8 @@ static void hotplug_event_notify(PCIDevice *dev)
>   static void hotplug_event_clear(PCIDevice *dev)
>   {
>       hotplug_event_update_event_status(dev);
> -    if (!msix_enabled(dev) && !msi_enabled(dev) && !dev->exp.hpev_notified) {
> +    if (!msix_enabled(dev) && !msi_enabled(dev) && pci_intx(dev) != -1 &&
> +        !dev->exp.hpev_notified) {
>           pci_irq_deassert(dev);
>       }
>   }
> diff --git a/hw/pci/pcie_aer.c b/hw/pci/pcie_aer.c
> index e1a8a88c8c..92bd0530dd 100644
> --- a/hw/pci/pcie_aer.c
> +++ b/hw/pci/pcie_aer.c
> @@ -290,7 +290,7 @@ static void pcie_aer_root_notify(PCIDevice *dev)
>           msix_notify(dev, pcie_aer_root_get_vector(dev));
>       } else if (msi_enabled(dev)) {
>           msi_notify(dev, pcie_aer_root_get_vector(dev));
> -    } else {
> +    } else if (pci_intx(dev) != -1) {
>           pci_irq_assert(dev);
>       }
>   }