6.15-stable review patch. If anyone has any objections, please let me know.
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From: Niklas Cassel cassel@kernel.org
commit 810276362bad172d063d1f6be1cc2cb425b90103 upstream.
While dw_pcie_ep_set_msix() writes the Table Size field correctly (N-1), the calculation of the PBA offset is wrong because it calculates space for (N-1) entries instead of N.
This results in the following QEMU error when using PCI passthrough on a device which relies on the PCI endpoint subsystem:
failed to add PCI capability 0x11[0x50]@0xb0: table & pba overlap, or they don't fit in BARs, or don't align
Fix the calculation of PBA offset in the MSI-X capability.
[bhelgaas: more specific subject and commit log]
Fixes: 83153d9f36e2 ("PCI: endpoint: Fix ->set_msix() to take BIR and offset as arguments") Signed-off-by: Niklas Cassel cassel@kernel.org Signed-off-by: Manivannan Sadhasivam manivannan.sadhasivam@linaro.org Signed-off-by: Bjorn Helgaas bhelgaas@google.com Reviewed-by: Wilfred Mallawa wilfred.mallawa@wdc.com Reviewed-by: Damien Le Moal dlemoal@kernel.org Cc: stable@vger.kernel.org Link: https://patch.msgid.link/20250514074313.283156-9-cassel@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/pci/controller/dwc/pcie-designware-ep.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)
--- a/drivers/pci/controller/dwc/pcie-designware-ep.c +++ b/drivers/pci/controller/dwc/pcie-designware-ep.c @@ -585,6 +585,7 @@ static int dw_pcie_ep_set_msix(struct pc struct dw_pcie *pci = to_dw_pcie_from_ep(ep); struct dw_pcie_ep_func *ep_func; u32 val, reg; + u16 actual_interrupts = interrupts + 1;
ep_func = dw_pcie_ep_get_func_from_ep(ep, func_no); if (!ep_func || !ep_func->msix_cap) @@ -595,7 +596,7 @@ static int dw_pcie_ep_set_msix(struct pc reg = ep_func->msix_cap + PCI_MSIX_FLAGS; val = dw_pcie_ep_readw_dbi(ep, func_no, reg); val &= ~PCI_MSIX_FLAGS_QSIZE; - val |= interrupts; + val |= interrupts; /* 0's based value */ dw_pcie_writew_dbi(pci, reg, val);
reg = ep_func->msix_cap + PCI_MSIX_TABLE; @@ -603,7 +604,7 @@ static int dw_pcie_ep_set_msix(struct pc dw_pcie_ep_writel_dbi(ep, func_no, reg, val);
reg = ep_func->msix_cap + PCI_MSIX_PBA; - val = (offset + (interrupts * PCI_MSIX_ENTRY_SIZE)) | bir; + val = (offset + (actual_interrupts * PCI_MSIX_ENTRY_SIZE)) | bir; dw_pcie_ep_writel_dbi(ep, func_no, reg, val);
dw_pcie_dbi_ro_wr_dis(pci);