On Mon, Nov 29, 2021 at 06:48:12AM -0500, Igor Mammedov wrote:
> With [1] patch hotplug of rtl8139 succeeds, with caveat that it
> fails to initialize IO bar, which is caused by [2] that makes
> firmware skip IO reservation for any PCIe device, which isn't
> correct in case of pcie-pci-bridge.
> Fix it by exposing hotplug type and making IO resource optional
> only if PCIe hotplug is in use.
>
> [1]
> "pci: reserve resources for pcie-pci-bridge to fix regressed hotplug on q35"
> [2]
> Fixes: 76327b9f32a ("fw/pci: do not automatically allocate IO region for PCIe
> bridges")
> Signed-off-by: Igor Mammedov imamm...@redhat.com
> CC: mapfe...@redhat.com
> CC: kra...@redhat.com
> CC: m...@redhat.com
> CC: lviv...@redhat.com
> CC: jus...@redhat.com
Acked-by: Michael S. Tsirkin <m...@redhat.com>
> ---
> src/fw/pciinit.c | 19 ++++++++++++++-----
> 1 file changed, 14 insertions(+), 5 deletions(-)
>
> diff --git a/src/fw/pciinit.c b/src/fw/pciinit.c
> index 7342d8d8..badf13d3 100644
> --- a/src/fw/pciinit.c
> +++ b/src/fw/pciinit.c
> @@ -793,7 +793,13 @@ pci_region_create_entry(struct pci_bus *bus, struct
> pci_device *dev,
> return entry;
> }
>
> -static int pci_bus_hotplug_support(struct pci_bus *bus, u8 pcie_cap)
> +typedef enum hotplug_type_t {
> + HOTPLUG_NO_SUPPORTED = 0,
> + HOTPLUG_PCIE,
> + HOTPLUG_SHPC
> +} hotplug_type_t;
> +
> +static hotplug_type_t pci_bus_hotplug_support(struct pci_bus *bus, u8
> pcie_cap)
> {
> u8 shpc_cap;
>
> @@ -819,12 +825,13 @@ static int pci_bus_hotplug_support(struct pci_bus *bus,
> u8 pcie_cap)
> */
> u16 slot_implemented = pcie_flags & PCI_EXP_FLAGS_SLOT;
>
> - return downstream_port && slot_implemented;
> + return downstream_port && slot_implemented ?
> + HOTPLUG_PCIE : HOTPLUG_NO_SUPPORTED;
> }
>
> check_shpc:
> shpc_cap = pci_find_capability(bus->bus_dev->bdf, PCI_CAP_ID_SHPC, 0);
> - return !!shpc_cap;
> + return !!shpc_cap ? HOTPLUG_SHPC : HOTPLUG_NO_SUPPORTED;
> }
>
> /* Test whether bridge support forwarding of transactions
> @@ -909,7 +916,7 @@ static int pci_bios_check_devices(struct pci_bus *busses)
> u8 pcie_cap = pci_find_capability(bdf, PCI_CAP_ID_EXP, 0);
> u8 qemu_cap = pci_find_resource_reserve_capability(bdf);
>
> - int hotplug_support = pci_bus_hotplug_support(s, pcie_cap);
> + hotplug_type_t hotplug_support = pci_bus_hotplug_support(s,
> pcie_cap);
> for (type = 0; type < PCI_REGION_TYPE_COUNT; type++) {
> u64 align = (type == PCI_REGION_TYPE_IO) ?
> PCI_BRIDGE_IO_MIN : PCI_BRIDGE_MEM_MIN;
> @@ -953,7 +960,9 @@ static int pci_bios_check_devices(struct pci_bus *busses)
> if (pci_region_align(&s->r[type]) > align)
> align = pci_region_align(&s->r[type]);
> u64 sum = pci_region_sum(&s->r[type]);
> - int resource_optional = pcie_cap && (type == PCI_REGION_TYPE_IO);
> + int resource_optional = 0;
> + if (hotplug_support == HOTPLUG_PCIE)
> + resource_optional = pcie_cap && (type == PCI_REGION_TYPE_IO);
> if (!sum && hotplug_support && !resource_optional)
> sum = align; /* reserve min size for hot-plug */
> if (size > sum) {
> --
> 2.27.0
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