From 2e1224183b1bec6610e01be80f007ee9ab0af9c0 Mon Sep 17 00:00:00 2001 From: Jon Derrick Date: Tue, 28 Jul 2020 13:49:41 -0600 Subject: PCI: vmd: Create bus offset configuration helper Move the bus offset configuration discovery code to a new helper. Modify the bus offset 2-bit decode switch to have a 0 case and a default error case, just in case the field is expanded in future hardware. Link: https://lore.kernel.org/r/20200728194945.14126-3-jonathan.derrick@intel.com Signed-off-by: Jon Derrick Signed-off-by: Lorenzo Pieralisi Signed-off-by: Bjorn Helgaas Reviewed-by: Andy Shevchenko --- drivers/pci/controller/vmd.c | 53 ++++++++++++++++++++++++++------------------ 1 file changed, 32 insertions(+), 21 deletions(-) (limited to 'drivers/pci') diff --git a/drivers/pci/controller/vmd.c b/drivers/pci/controller/vmd.c index 44b2db789eff..a462719af12a 100644 --- a/drivers/pci/controller/vmd.c +++ b/drivers/pci/controller/vmd.c @@ -471,6 +471,35 @@ static int vmd_get_phys_offsets(struct vmd_dev *vmd, bool native_hint, return 0; } +static int vmd_get_bus_number_start(struct vmd_dev *vmd) +{ + struct pci_dev *dev = vmd->dev; + u16 reg; + + pci_read_config_word(dev, PCI_REG_VMCAP, ®); + if (BUS_RESTRICT_CAP(reg)) { + pci_read_config_word(dev, PCI_REG_VMCONFIG, ®); + + switch (BUS_RESTRICT_CFG(reg)) { + case 0: + vmd->busn_start = 0; + break; + case 1: + vmd->busn_start = 128; + break; + case 2: + vmd->busn_start = 224; + break; + default: + pci_err(dev, "Unknown Bus Offset Setting (%d)\n", + BUS_RESTRICT_CFG(reg)); + return -ENODEV; + } + } + + return 0; +} + static int vmd_enable_domain(struct vmd_dev *vmd, unsigned long features) { struct pci_sysdata *sd = &vmd->sysdata; @@ -506,27 +535,9 @@ static int vmd_enable_domain(struct vmd_dev *vmd, unsigned long features) * limits the bus range to between 0-127, 128-255, or 224-255 */ if (features & VMD_FEAT_HAS_BUS_RESTRICTIONS) { - u16 reg16; - - pci_read_config_word(vmd->dev, PCI_REG_VMCAP, ®16); - if (BUS_RESTRICT_CAP(reg16)) { - pci_read_config_word(vmd->dev, PCI_REG_VMCONFIG, - ®16); - - switch (BUS_RESTRICT_CFG(reg16)) { - case 1: - vmd->busn_start = 128; - break; - case 2: - vmd->busn_start = 224; - break; - case 3: - pci_err(vmd->dev, "Unknown Bus Offset Setting\n"); - return -ENODEV; - default: - break; - } - } + ret = vmd_get_bus_number_start(vmd); + if (ret) + return ret; } res = &vmd->dev->resource[VMD_CFGBAR]; -- cgit v1.2.3