From: Jon Derrick jonathan.derrick@intel.com
commit e3dffa4f6c3612dea337c9c59191bd418afc941b upstream.
VMD maps child device config spaces to the VMD Config BAR linearly regardless of the starting bus offset. Because of this, the config address decode must ignore starting bus offsets when mapping the BDF to the config space address.
Fixes: 2a5a9c9a20f9 ("PCI: vmd: Add offset to bus numbers if necessary") Signed-off-by: Jon Derrick jonathan.derrick@intel.com Signed-off-by: Lorenzo Pieralisi lorenzo.pieralisi@arm.com Cc: stable@vger.kernel.org # v5.2+ Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/pci/controller/vmd.c | 16 +++++++++------- 1 file changed, 9 insertions(+), 7 deletions(-)
--- a/drivers/pci/controller/vmd.c +++ b/drivers/pci/controller/vmd.c @@ -94,6 +94,7 @@ struct vmd_dev { struct resource resources[3]; struct irq_domain *irq_domain; struct pci_bus *bus; + u8 busn_start;
struct dma_map_ops dma_ops; struct dma_domain dma_domain; @@ -440,7 +441,8 @@ static char __iomem *vmd_cfg_addr(struct unsigned int devfn, int reg, int len) { char __iomem *addr = vmd->cfgbar + - (bus->number << 20) + (devfn << 12) + reg; + ((bus->number - vmd->busn_start) << 20) + + (devfn << 12) + reg;
if ((addr - vmd->cfgbar) + len >= resource_size(&vmd->dev->resource[VMD_CFGBAR])) @@ -563,7 +565,7 @@ static int vmd_enable_domain(struct vmd_ unsigned long flags; LIST_HEAD(resources); resource_size_t offset[2] = {0}; - resource_size_t membar2_offset = 0x2000, busn_start = 0; + resource_size_t membar2_offset = 0x2000; struct pci_bus *child;
/* @@ -606,14 +608,14 @@ static int vmd_enable_domain(struct vmd_ pci_read_config_dword(vmd->dev, PCI_REG_VMCONFIG, &vmconfig); if (BUS_RESTRICT_CAP(vmcap) && (BUS_RESTRICT_CFG(vmconfig) == 0x1)) - busn_start = 128; + vmd->busn_start = 128; }
res = &vmd->dev->resource[VMD_CFGBAR]; vmd->resources[0] = (struct resource) { .name = "VMD CFGBAR", - .start = busn_start, - .end = busn_start + (resource_size(res) >> 20) - 1, + .start = vmd->busn_start, + .end = vmd->busn_start + (resource_size(res) >> 20) - 1, .flags = IORESOURCE_BUS | IORESOURCE_PCI_FIXED, };
@@ -681,8 +683,8 @@ static int vmd_enable_domain(struct vmd_ pci_add_resource_offset(&resources, &vmd->resources[1], offset[0]); pci_add_resource_offset(&resources, &vmd->resources[2], offset[1]);
- vmd->bus = pci_create_root_bus(&vmd->dev->dev, busn_start, &vmd_ops, - sd, &resources); + vmd->bus = pci_create_root_bus(&vmd->dev->dev, vmd->busn_start, + &vmd_ops, sd, &resources); if (!vmd->bus) { pci_free_resource_list(&resources); irq_domain_remove(vmd->irq_domain);