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| author |   Thomas Petazzoni <thomas.petazzoni@bootlin.com> | 2019-02-20 10:48:41 +0100 |
|---|---|---|
| committer |   Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> | 2019-02-22 10:51:14 +0000 |
| commit | 33776d059630e5045ea9ccf756c74de8f9cc86de (patch) | |
| tree | 72e9013567363a1e8473693b7573b1686951d7d8 /drivers/pci/pci-bridge-emul.c | |
| parent | PCI: pci-bridge-emul: Create per-bridge copy of register behavior (diff) | |
| download | wireguard-linux-33776d059630e5045ea9ccf756c74de8f9cc86de.tar.xz wireguard-linux-33776d059630e5045ea9ccf756c74de8f9cc86de.zip | |
PCI: pci-bridge-emul: Extend pci_bridge_emul_init() with flags
Depending on the capabilities of the PCI controller/platform, the
PCI-to-PCI bridge emulation behavior might need to be different. For
example, on platforms that use the pci-mvebu code, we currently don't
support prefetchable memory BARs, so the corresponding fields in the
PCI-to-PCI bridge configuration space should be read-only.
To implement this, extend pci_bridge_emul_init() to take a "flags"
argument, with currently one flag supported:
PCI_BRIDGE_EMUL_NO_PREFETCHABLE_BAR
that will make the prefetchable memory base and limit registers
read-only.
The pci-mvebu and pci-aardvark drivers are updated accordingly.
Fixes: 1f08673eef123 ("PCI: mvebu: Convert to PCI emulated bridge config space")
Reported-by: Luís Mendes <luis.p.mendes@gmail.com>
Reported-by: Leigh Brown <leigh@solinno.co.uk>
Tested-by: Leigh Brown <leigh@solinno.co.uk>
Tested-by: Luis Mendes <luis.p.mendes@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: stable@vger.kernel.org
Cc: Luís Mendes <luis.p.mendes@gmail.com>
Cc: Leigh Brown <leigh@solinno.co.uk>
Diffstat (limited to 'drivers/pci/pci-bridge-emul.c')
| -rw-r--r-- | drivers/pci/pci-bridge-emul.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/drivers/pci/pci-bridge-emul.c b/drivers/pci/pci-bridge-emul.c index dd8d8060317e..83fb077d0b41 100644 --- a/drivers/pci/pci-bridge-emul.c +++ b/drivers/pci/pci-bridge-emul.c @@ -267,7 +267,8 @@ const static struct pci_bridge_reg_behavior pcie_cap_regs_behavior[] = { * (typically at least vendor, device, revision), the ->ops pointer, * and optionally ->data and ->has_pcie. */ -int pci_bridge_emul_init(struct pci_bridge_emul *bridge) +int pci_bridge_emul_init(struct pci_bridge_emul *bridge, + unsigned int flags) { bridge->conf.class_revision |= PCI_CLASS_BRIDGE_PCI << 16; bridge->conf.header_type = PCI_HEADER_TYPE_BRIDGE; @@ -295,6 +296,11 @@ int pci_bridge_emul_init(struct pci_bridge_emul *bridge) } } + if (flags & PCI_BRIDGE_EMUL_NO_PREFETCHABLE_BAR) { + bridge->pci_regs_behavior[PCI_PREF_MEMORY_BASE / 4].ro = ~0; + bridge->pci_regs_behavior[PCI_PREF_MEMORY_BASE / 4].rw = 0; + } + return 0; } |