diff options
| -rw-r--r-- | drivers/staging/rdma/hfi1/chip.c | 56 |
1 files changed, 56 insertions, 0 deletions
diff --git a/drivers/staging/rdma/hfi1/chip.c b/drivers/staging/rdma/hfi1/chip.c index fe73ebf077e4..7799652773d5 100644 --- a/drivers/staging/rdma/hfi1/chip.c +++ b/drivers/staging/rdma/hfi1/chip.c @@ -13943,6 +13943,50 @@ static int obtain_boardname(struct hfi1_devdata *dd) return 0; } +/* + * Check the interrupt registers to make sure that they are mapped correctly. + * It is intended to help user identify any mismapping by VMM when the driver + * is running in a VM. This function should only be called before interrupt + * is set up properly. + * + * Return 0 on success, -EINVAL on failure. + */ +static int check_int_registers(struct hfi1_devdata *dd) +{ + u64 reg; + u64 all_bits = ~(u64)0; + u64 mask; + + /* Clear CceIntMask[0] to avoid raising any interrupts */ + mask = read_csr(dd, CCE_INT_MASK); + write_csr(dd, CCE_INT_MASK, 0ull); + reg = read_csr(dd, CCE_INT_MASK); + if (reg) + goto err_exit; + + /* Clear all interrupt status bits */ + write_csr(dd, CCE_INT_CLEAR, all_bits); + reg = read_csr(dd, CCE_INT_STATUS); + if (reg) + goto err_exit; + + /* Set all interrupt status bits */ + write_csr(dd, CCE_INT_FORCE, all_bits); + reg = read_csr(dd, CCE_INT_STATUS); + if (reg != all_bits) + goto err_exit; + + /* Restore the interrupt mask */ + write_csr(dd, CCE_INT_CLEAR, all_bits); + write_csr(dd, CCE_INT_MASK, mask); + + return 0; +err_exit: + write_csr(dd, CCE_INT_MASK, mask); + dd_dev_err(dd, "Interrupt registers not properly mapped by VMM\n"); + return -EINVAL; +} + /** * Allocate and initialize the device structure for the hfi. * @dev: the pci_dev for hfi1_ib device @@ -13967,6 +14011,7 @@ struct hfi1_devdata *hfi1_init_dd(struct pci_dev *pdev, "RTL FPGA emulation", "Functional simulator" }; + struct pci_dev *parent = pdev->bus->self; dd = hfi1_alloc_devdata(pdev, NUM_IB_PORTS * sizeof(struct hfi1_pportdata)); @@ -14046,6 +14091,17 @@ struct hfi1_devdata *hfi1_init_dd(struct pci_dev *pdev, & CCE_REVISION_CHIP_REV_MINOR_MASK; /* + * Check interrupt registers mapping if the driver has no access to + * the upstream component. In this case, it is likely that the driver + * is running in a VM. + */ + if (!parent) { + ret = check_int_registers(dd); + if (ret) + goto bail_cleanup; + } + + /* * obtain the hardware ID - NOT related to unit, which is a * software enumeration */ |