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PCI/VMD: Configure MPS settings before adding devices

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In order to provide the most performance and/or compatible settings,
ensure VMD root buses observe the pcie bus tuning settings by
configuring those settings prior to adding the devices to the pcie tree.

This patch open-codes pci_rescan_bus() and configures the buses prior to
adding devices and attaching drivers.

Signed-off-by: Jon Derrick <jonathan.derrick@intel.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Reviewed-by: Keith Busch <keith.busch@intel.com>
This commit is contained in:
Jon Derrick 2018-12-13 09:23:42 -07:00 committed by Lorenzo Pieralisi
parent bfeffd1552
commit 0294951030
1 changed files with 14 additions and 1 deletions
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15
drivers/pci/controller/vmd.c
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@ -571,6 +571,7 @@ static int vmd_enable_domain(struct vmd_dev *vmd, unsigned long features)
LIST_HEAD(resources);
resource_size_t offset[2] = {0};
resource_size_t membar2_offset = 0x2000, busn_start = 0;
struct pci_bus *child;
/*
* Shadow registers may exist in certain VMD device ids which allow
@ -698,7 +699,19 @@ static int vmd_enable_domain(struct vmd_dev *vmd, unsigned long features)
vmd_attach_resources(vmd);
vmd_setup_dma_ops(vmd);
dev_set_msi_domain(&vmd->bus->dev, vmd->irq_domain);
pci_rescan_bus(vmd->bus);
pci_scan_child_bus(vmd->bus);
pci_assign_unassigned_bus_resources(vmd->bus);
/*
* VMD root buses are virtual and don't return true on pci_is_pcie()
* and will fail pcie_bus_configure_settings() early. It can instead be
* run on each of the real root ports.
*/
list_for_each_entry(child, &vmd->bus->children, node)
pcie_bus_configure_settings(child);
pci_bus_add_devices(vmd->bus);
WARN(sysfs_create_link(&vmd->dev->dev.kobj, &vmd->bus->dev.kobj,
"domain"), "Can't create symlink to domain\n");