91 lines
3.4 KiB
Diff
91 lines
3.4 KiB
Diff
From 153f5ec6899055276eaef20eae7b6d9fd090a05a Mon Sep 17 00:00:00 2001
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From: Igor Mammedov <imammedo@redhat.com>
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Date: Mon, 29 Nov 2021 06:48:12 -0500
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Subject: pci: let firmware reserve IO for pcie-pci-bridge
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RH-Bugzilla: 2001921
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With [1] patch hotplug of rtl8139 succeeds, with caveat that it
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fails to initialize IO bar, which is caused by [2] that makes
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firmware skip IO reservation for any PCIe device, which isn't
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correct in case of pcie-pci-bridge.
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Fix it by exposing hotplug type and making IO resource optional
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only if PCIe hotplug is in use.
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[1]
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"pci: reserve resources for pcie-pci-bridge to fix regressed hotplug on q35"
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[2]
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Fixes: 76327b9f32a ("fw/pci: do not automatically allocate IO region for PCIe bridges")
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Signed-off-by: Igor Mammedov imammedo@redhat.com
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CC: mapfelba@redhat.com
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CC: kraxel@redhat.com
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CC: mst@redhat.com
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CC: lvivier@redhat.com
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CC: jusual@redhat.com
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Tested-by: Laurent Vivier <lvivier@redhat.com>
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Acked-by: Michael S. Tsirkin <mst@redhat.com>
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Message-Id: <20211129114812.231849-3-imammedo@redhat.com>
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Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
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---
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src/fw/pciinit.c | 19 ++++++++++++++-----
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1 file changed, 14 insertions(+), 5 deletions(-)
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diff --git a/src/fw/pciinit.c b/src/fw/pciinit.c
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index d25931b..3c99d51 100644
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--- a/src/fw/pciinit.c
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+++ b/src/fw/pciinit.c
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@@ -793,7 +793,13 @@ pci_region_create_entry(struct pci_bus *bus, struct pci_device *dev,
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return entry;
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}
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-static int pci_bus_hotplug_support(struct pci_bus *bus, u8 pcie_cap)
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+typedef enum hotplug_type_t {
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+ HOTPLUG_NO_SUPPORTED = 0,
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+ HOTPLUG_PCIE,
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+ HOTPLUG_SHPC
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+} hotplug_type_t;
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+
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+static hotplug_type_t pci_bus_hotplug_support(struct pci_bus *bus, u8 pcie_cap)
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{
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u8 shpc_cap;
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@@ -815,11 +821,12 @@ static int pci_bus_hotplug_support(struct pci_bus *bus, u8 pcie_cap)
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*/
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u16 slot_implemented = pcie_flags & PCI_EXP_FLAGS_SLOT;
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- return downstream_port && slot_implemented;
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+ return downstream_port && slot_implemented ?
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+ HOTPLUG_PCIE : HOTPLUG_NO_SUPPORTED;
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}
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shpc_cap = pci_find_capability(bus->bus_dev->bdf, PCI_CAP_ID_SHPC, 0);
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- return !!shpc_cap;
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+ return !!shpc_cap ? HOTPLUG_SHPC : HOTPLUG_NO_SUPPORTED;
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}
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/* Test whether bridge support forwarding of transactions
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@@ -904,7 +911,7 @@ static int pci_bios_check_devices(struct pci_bus *busses)
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u8 pcie_cap = pci_find_capability(bdf, PCI_CAP_ID_EXP, 0);
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u8 qemu_cap = pci_find_resource_reserve_capability(bdf);
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- int hotplug_support = pci_bus_hotplug_support(s, pcie_cap);
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+ hotplug_type_t hotplug_support = pci_bus_hotplug_support(s, pcie_cap);
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for (type = 0; type < PCI_REGION_TYPE_COUNT; type++) {
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u64 align = (type == PCI_REGION_TYPE_IO) ?
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PCI_BRIDGE_IO_MIN : PCI_BRIDGE_MEM_MIN;
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@@ -948,7 +955,9 @@ static int pci_bios_check_devices(struct pci_bus *busses)
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if (pci_region_align(&s->r[type]) > align)
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align = pci_region_align(&s->r[type]);
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u64 sum = pci_region_sum(&s->r[type]);
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- int resource_optional = pcie_cap && (type == PCI_REGION_TYPE_IO);
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+ int resource_optional = 0;
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+ if (hotplug_support == HOTPLUG_PCIE)
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+ resource_optional = pcie_cap && (type == PCI_REGION_TYPE_IO);
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if (!sum && hotplug_support && !resource_optional)
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sum = align; /* reserve min size for hot-plug */
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if (size > sum) {
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--
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2.27.0
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