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From 7bcc0412428050b0ab1fd70cbb4aaead5ac3c0e5 Mon Sep 17 00:00:00 2001
From: Manoj Kumar <manoj.kumar3@arm.com>
Date: Wed, 29 Jan 2020 17:21:39 +0000
Subject: [PATCH 4/4] n1sdp: update n1sdp pci quirk for SR-IOV support
VFs are not probing the vendor ID first, which is otherwise
the gate keeper for undiscovered devices. So any accesses using
a config space offset greater than 0 must be coming for an
already discovered device or from a VF that has just been created.
Also if Linux already has a struct pci_dev* for a given BDF,
this device is safe to access.
Skip the firmware table in these cases and allow accesses to
those devices. That enables SR-IOV support on the N1SDP board.
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
---
drivers/pci/controller/pcie-n1sdp.c | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/drivers/pci/controller/pcie-n1sdp.c b/drivers/pci/controller/pcie-n1sdp.c
index 620ab221466c..04c0de043817 100644
--- a/drivers/pci/controller/pcie-n1sdp.c
+++ b/drivers/pci/controller/pcie-n1sdp.c
@@ -61,6 +61,7 @@ static void __iomem *pci_n1sdp_map_bus(struct pci_bus *bus, unsigned int devfn,
unsigned int segment = bus->domain_nr;
unsigned int bdf_addr;
unsigned int table_count, i;
+ struct pci_dev *dev;
if (segment >= MAX_SEGMENTS ||
busn < cfg->busr.start || busn > cfg->busr.end)
@@ -70,6 +71,14 @@ static void __iomem *pci_n1sdp_map_bus(struct pci_bus *bus, unsigned int devfn,
if (busn == 0 && devfn == 0)
return rc_remapped_addr[segment] + where;
+ dev = pci_get_domain_bus_and_slot(segment, busn, devfn);
+ if (dev && dev->is_virtfn)
+ return pci_ecam_map_bus(bus, devfn, where);
+
+ /* Accesses beyond the vendor ID always go to existing devices. */
+ if (where > 0)
+ return pci_ecam_map_bus(bus, devfn, where);
+
busn -= cfg->busr.start;
bdf_addr = (busn << cfg->ops->bus_shift) + (devfn << devfn_shift);
table_count = pcie_discovery_data[segment]->nr_bdfs;
--
2.25.0
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