On Xen kernels, if ATC (address translation cache) is enabled, the first PCIe DMA read from the adapter fails with an error. This is due to a bug ASIC, which leads to a failure of 1860 ports to be initialised. This patch includes the fix to disable Invalidated Tag Match Enable capability by setting the bit 26 of CHIP_MISC_PRG to 0, by default it is set to 1. Signed-off-by: Anil Gurumurthy <agurumur@xxxxxxxxxxx> Signed-off-by: Vijaya Mohan Guvva <vmohan@xxxxxxxxxxx> --- drivers/scsi/bfa/bfa_ioc_ct.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/drivers/scsi/bfa/bfa_ioc_ct.c b/drivers/scsi/bfa/bfa_ioc_ct.c index de4e726..a8e52a1 100644 --- a/drivers/scsi/bfa/bfa_ioc_ct.c +++ b/drivers/scsi/bfa/bfa_ioc_ct.c @@ -918,6 +918,16 @@ bfa_ioc_ct2_pll_init(void __iomem *rb, enum bfi_asic_mode mode) } } + /* + * The very first PCIe DMA Read done by LPU fails with a fatal error, + * when Address Translation Cache (ATC) has been enabled by system BIOS. + * + * Workaround: + * Disable Invalidated Tag Match Enable capability by setting the bit 26 + * of CHIP_MISC_PRG to 0, by default it is set to 1. + */ + r32 = readl(rb + CT2_CHIP_MISC_PRG); + writel((r32 & 0xfbffffff), (rb + CT2_CHIP_MISC_PRG)); /* * Mask the interrupts and clear any -- 1.7.12 -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
