Commit 6dce5aa59e0b ("PCI: xgene: Use inbound resources for setup") killed PCIe on my XGene-1 box (a Mustang board). The machine itself is still alive, but half of its storage (over NVMe) is gone, and the NVMe driver just times out.

Note that this machine boots with a device tree provided by the UEFI firmware (2016 vintage), which could well be non conformant with the spec, hence the breakage.

With the patch reverted, the box boots 5.17-rc8 with flying colors.

Cc: Rob Herring robh@kernel.org Cc: Toan Le toan@os.amperecomputing.com Cc: Lorenzo Pieralisi lorenzo.pieralisi@arm.com Cc: Krzysztof Wilczyński kw@linux.com Cc: Bjorn Helgaas bhelgaas@google.com Cc: Stéphane Graber stgraber@ubuntu.com Cc: dann frazier dann.frazier@canonical.com Cc: stable@vger.kernel.org Signed-off-by: Marc Zyngier maz@kernel.org Fixes: 6dce5aa59e0b ("PCI: xgene: Use inbound resources for setup") Link: https://lore.kernel.org/all/Yf2wTLjmcRj+AbDv@xps13.dannf --- drivers/pci/controller/pci-xgene.c | 33 ++++++++++++++++++++---------- 1 file changed, 22 insertions(+), 11 deletions(-)

diff --git a/drivers/pci/controller/pci-xgene.c b/drivers/pci/controller/pci-xgene.c index 0d5acbfc7143..aa41ceaf031f 100644 --- a/drivers/pci/controller/pci-xgene.c +++ b/drivers/pci/controller/pci-xgene.c @@ -479,28 +479,27 @@ static int xgene_pcie_select_ib_reg(u8 *ib_reg_mask, u64 size) }

static void xgene_pcie_setup_ib_reg(struct xgene_pcie *port, - struct resource_entry *entry, - u8 *ib_reg_mask) + struct of_pci_range *range, u8 *ib_reg_mask) { void __iomem *cfg_base = port->cfg_base; struct device *dev = port->dev; void __iomem *bar_addr; u32 pim_reg; - u64 cpu_addr = entry->res->start; - u64 pci_addr = cpu_addr - entry->offset; - u64 size = resource_size(entry->res); + u64 cpu_addr = range->cpu_addr; + u64 pci_addr = range->pci_addr; + u64 size = range->size; u64 mask = ~(size - 1) | EN_REG; u32 flags = PCI_BASE_ADDRESS_MEM_TYPE_64; u32 bar_low; int region;

- region = xgene_pcie_select_ib_reg(ib_reg_mask, size); + region = xgene_pcie_select_ib_reg(ib_reg_mask, range->size); if (region < 0) { dev_warn(dev, "invalid pcie dma-range config\n"); return; }

- if (entry->res->flags & IORESOURCE_PREFETCH) + if (range->flags & IORESOURCE_PREFETCH) flags |= PCI_BASE_ADDRESS_MEM_PREFETCH;

bar_low = pcie_bar_low_val((u32)cpu_addr, flags); @@ -531,13 +530,25 @@ static void xgene_pcie_setup_ib_reg(struct xgene_pcie *port,

static int xgene_pcie_parse_map_dma_ranges(struct xgene_pcie *port) { - struct pci_host_bridge *bridge = pci_host_bridge_from_priv(port); - struct resource_entry *entry; + struct device_node *np = port->node; + struct of_pci_range range; + struct of_pci_range_parser parser; + struct device *dev = port->dev; u8 ib_reg_mask = 0;

- resource_list_for_each_entry(entry, &bridge->dma_ranges) - xgene_pcie_setup_ib_reg(port, entry, &ib_reg_mask); + if (of_pci_dma_range_parser_init(&parser, np)) { + dev_err(dev, "missing dma-ranges property\n"); + return -EINVAL; + } + + /* Get the dma-ranges from DT */ + for_each_of_pci_range(&parser, &range) { + u64 end = range.cpu_addr + range.size - 1;

+ dev_dbg(dev, "0x%08x 0x%016llx..0x%016llx -> 0x%016llx\n", + range.flags, range.cpu_addr, end, range.pci_addr); + xgene_pcie_setup_ib_reg(port, &range, &ib_reg_mask); + } return 0; }