From 2c9446a1d63f1ca570e92f89422595732efedf44 Mon Sep 17 00:00:00 2001 From: Bryan O'Sullivan Date: Thu, 28 Sep 2006 09:00:00 -0700 Subject: IB/ipath: Support revision 2 InfiniPath PCIE devices This also entailed a little GPIO-interrupt general cleanup. Signed-off-by: Bryan O'Sullivan Signed-off-by: Roland Dreier --- drivers/infiniband/hw/ipath/ipath_intr.c | 88 ++++++++++++++++++++++++++------ 1 file changed, 71 insertions(+), 17 deletions(-) (limited to 'drivers/infiniband/hw/ipath/ipath_intr.c') diff --git a/drivers/infiniband/hw/ipath/ipath_intr.c b/drivers/infiniband/hw/ipath/ipath_intr.c index 49bf7bb15b04b..5762b87d12eca 100644 --- a/drivers/infiniband/hw/ipath/ipath_intr.c +++ b/drivers/infiniband/hw/ipath/ipath_intr.c @@ -808,7 +808,7 @@ irqreturn_t ipath_intr(int irq, void *data, struct pt_regs *regs) if (oldhead != curtail) { if (dd->ipath_flags & IPATH_GPIO_INTR) { ipath_write_kreg(dd, dd->ipath_kregs->kr_gpio_clear, - (u64) (1 << 2)); + (u64) (1 << IPATH_GPIO_PORT0_BIT)); istat = port0rbits | INFINIPATH_I_GPIO; } else @@ -867,26 +867,80 @@ irqreturn_t ipath_intr(int irq, void *data, struct pt_regs *regs) if (istat & INFINIPATH_I_GPIO) { /* - * Packets are available in the port 0 rcv queue. - * Eventually this needs to be generalized to check - * IPATH_GPIO_INTR, and the specific GPIO bit, if - * GPIO interrupts are used for anything else. + * GPIO interrupts fall in two broad classes: + * GPIO_2 indicates (on some HT4xx boards) that a packet + * has arrived for Port 0. Checking for this + * is controlled by flag IPATH_GPIO_INTR. + * GPIO_3..5 on IBA6120 Rev2 chips indicate errors + * that we need to count. Checking for this + * is controlled by flag IPATH_GPIO_ERRINTRS. */ - if (unlikely(!(dd->ipath_flags & IPATH_GPIO_INTR))) { - u32 gpiostatus; - gpiostatus = ipath_read_kreg32( - dd, dd->ipath_kregs->kr_gpio_status); - ipath_dbg("Unexpected GPIO interrupt bits %x\n", - gpiostatus); - ipath_write_kreg(dd, dd->ipath_kregs->kr_gpio_clear, - gpiostatus); + u32 gpiostatus; + u32 to_clear = 0; + + gpiostatus = ipath_read_kreg32( + dd, dd->ipath_kregs->kr_gpio_status); + /* First the error-counter case. + */ + if ((gpiostatus & IPATH_GPIO_ERRINTR_MASK) && + (dd->ipath_flags & IPATH_GPIO_ERRINTRS)) { + /* want to clear the bits we see asserted. */ + to_clear |= (gpiostatus & IPATH_GPIO_ERRINTR_MASK); + + /* + * Count appropriately, clear bits out of our copy, + * as they have been "handled". + */ + if (gpiostatus & (1 << IPATH_GPIO_RXUVL_BIT)) { + ipath_dbg("FlowCtl on UnsupVL\n"); + dd->ipath_rxfc_unsupvl_errs++; + } + if (gpiostatus & (1 << IPATH_GPIO_OVRUN_BIT)) { + ipath_dbg("Overrun Threshold exceeded\n"); + dd->ipath_overrun_thresh_errs++; + } + if (gpiostatus & (1 << IPATH_GPIO_LLI_BIT)) { + ipath_dbg("Local Link Integrity error\n"); + dd->ipath_lli_errs++; + } + gpiostatus &= ~IPATH_GPIO_ERRINTR_MASK; } - else { - /* Clear GPIO status bit 2 */ - ipath_write_kreg(dd, dd->ipath_kregs->kr_gpio_clear, - (u64) (1 << 2)); + /* Now the Port0 Receive case */ + if ((gpiostatus & (1 << IPATH_GPIO_PORT0_BIT)) && + (dd->ipath_flags & IPATH_GPIO_INTR)) { + /* + * GPIO status bit 2 is set, and we expected it. + * clear it and indicate in p0bits. + * This probably only happens if a Port0 pkt + * arrives at _just_ the wrong time, and we + * handle that by seting chk0rcv; + */ + to_clear |= (1 << IPATH_GPIO_PORT0_BIT); + gpiostatus &= ~(1 << IPATH_GPIO_PORT0_BIT); chk0rcv = 1; } + if (unlikely(gpiostatus)) { + /* + * Some unexpected bits remain. If they could have + * caused the interrupt, complain and clear. + * MEA: this is almost certainly non-ideal. + * we should look into auto-disable of unexpected + * GPIO interrupts, possibly on a "three strikes" + * basis. + */ + u32 mask; + mask = ipath_read_kreg32( + dd, dd->ipath_kregs->kr_gpio_mask); + if (mask & gpiostatus) { + ipath_dbg("Unexpected GPIO IRQ bits %x\n", + gpiostatus & mask); + to_clear |= (gpiostatus & mask); + } + } + if (to_clear) { + ipath_write_kreg(dd, dd->ipath_kregs->kr_gpio_clear, + (u64) to_clear); + } } chk0rcv |= istat & port0rbits; -- cgit 1.2.3-korg