[openib-general] [PATCH 6 of 20] ipath - chip initialisation code
Bryan O'Sullivan
bos at pathscale.com
Thu Mar 9 16:35:36 PST 2006
Signed-off-by: Bryan O'Sullivan <bos at pathscale.com>
diff -r 6955d1da1172 -r 696ba12283f4 drivers/infiniband/hw/ipath/ipath_init_chip.c
--- /dev/null Thu Jan 1 00:00:00 1970 +0000
+++ b/drivers/infiniband/hw/ipath/ipath_init_chip.c Thu Mar 9 16:15:43 2006 -0800
@@ -0,0 +1,957 @@
+/*
+ * Copyright (c) 2003, 2004, 2005, 2006 PathScale, Inc. All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses. You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the
+ * OpenIB.org BSD license below:
+ *
+ * Redistribution and use in source and binary forms, with or
+ * without modification, are permitted provided that the following
+ * conditions are met:
+ *
+ * - Redistributions of source code must retain the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer in the documentation and/or other materials
+ * provided with the distribution.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#include <linux/pci.h>
+#include <linux/netdevice.h>
+#include <linux/vmalloc.h>
+
+#include "ipath_kernel.h"
+#include "ips_common.h"
+
+/*
+ * min buffers we want to have per port, after driver
+ */
+#define IPATH_MIN_USER_PORT_BUFCNT 8
+
+/*
+ * Number of ports we are configured to use (to allow for more pio
+ * buffers per port, etc.) Zero means use chip value.
+ */
+static ushort ipath_cfgports;
+
+module_param_named(cfgports, ipath_cfgports, ushort, S_IRUGO);
+MODULE_PARM_DESC(cfgports, "Set max number of ports to use");
+
+/*
+ * Number of buffers reserved for driver (layered drivers and SMA
+ * send). Reserved at end of buffer list.
+ */
+static ushort ipath_kpiobufs = 32;
+
+static int ipath_set_kpiobufs(const char *val, struct kernel_param *kp);
+
+module_param_call(kpiobufs, ipath_set_kpiobufs, param_get_uint,
+ &ipath_kpiobufs, S_IWUSR | S_IRUGO);
+MODULE_PARM_DESC(kpiobufs, "Set number of PIO buffers for driver");
+
+/**
+ * create_port0_egr - allocate the eager TID buffers
+ * @dd: the infinipath device
+ *
+ * This code is now quite different for user and kernel, because
+ * the kernel uses skb's, for the accelerated network performance.
+ * This is the kernel (port0) version.
+ *
+ * Allocate the eager TID buffers and program them into infinipath.
+ * We use the network layer alloc_skb() allocator to allocate the
+ * memory, and either use the buffers as is for things like SMA
+ * packets, or pass the buffers up to the ipath layered driver and
+ * thence the network layer, replacing them as we do so (see
+ * ipath_rcv_layer()).
+ */
+static int create_port0_egr(struct ipath_devdata *dd)
+{
+ unsigned e, egrcnt;
+ struct sk_buff **skbs;
+
+ egrcnt = dd->ipath_rcvegrcnt;
+
+ skbs = vmalloc(sizeof(*dd->ipath_port0_skbs) * egrcnt);
+ if (skbs == NULL) {
+ ipath_dev_err(dd, "allocation error for eager TID "
+ "skb array\n");
+ return -ENOMEM;
+ }
+ for (e = 0; e < egrcnt; e++) {
+ /*
+ * This is a bit tricky in that we allocate extra
+ * space for 2 bytes of the 14 byte ethernet header.
+ * These two bytes are passed in the ipath header so
+ * the rest of the data is word aligned. We allocate
+ * 4 bytes so that the data buffer stays word aligned.
+ * See ipath_kreceive() for more details.
+ */
+ skbs[e] = ipath_alloc_skb(dd, GFP_KERNEL);
+ if (!skbs[e]) {
+ ipath_dev_err(dd, "SKB allocation error for "
+ "eager TID %u\n", e);
+ while (e != 0)
+ dev_kfree_skb(skbs[--e]);
+ return -ENOMEM;
+ }
+ }
+ /*
+ * After loop above, so we can test non-NULL to see if ready
+ * to use at receive, etc.
+ */
+ dd->ipath_port0_skbs = skbs;
+
+ for (e = 0; e < egrcnt; e++)
+ dd->ipath_f_put_tid(dd, e + (u64 __iomem *)
+ ((char __iomem *) dd->ipath_kregbase
+ + dd->ipath_rcvegrbase), 0,
+ virt_to_phys(dd->ipath_port0_skbs[e]->data));
+
+ return 0;
+}
+
+static int bringup_link(struct ipath_devdata *dd)
+{
+ u64 val, ibc;
+ int ret = 0;
+
+ dd->ipath_control &= ~INFINIPATH_C_LINKENABLE; /* hold IBC in reset */
+ ipath_write_kreg(dd, dd->ipath_kregs->kr_control, dd->ipath_control);
+
+ /*
+ * Note that prior to try 14 or 15 of IB, the credit scaling
+ * wasn't working, because it was swapped for writes with the
+ * 1 bit default linkstate field
+ */
+
+ /* ignore pbc and align word */
+ val = dd->ipath_piosize2k - 2 * sizeof(u32);
+ /*
+ * for ICRC, which we only send in diag test pkt mode, and we
+ * don't need to worry about that for mtu
+ */
+ val += 1;
+ /*
+ * Set the IBC maxpktlength to the size of our pio buffers the
+ * maxpktlength is in words. This is *not* the IB data MTU.
+ */
+ ibc = (val / sizeof(u32)) << INFINIPATH_IBCC_MAXPKTLEN_SHIFT;
+ ibc |= 0x5ULL << INFINIPATH_IBCC_FLOWCTRLWATERMARK_SHIFT; /* in KB */
+ /*
+ * How often flowctrl sent. More or less in usecs; balance
+ * against watermark value, so that in theory senders always
+ * get a flow control update in time to not let the IB link go
+ * idle.
+ */
+ ibc |= 0x3ULL << INFINIPATH_IBCC_FLOWCTRLPERIOD_SHIFT;
+ /* max error tolerance */
+ ibc |= 0xfULL << INFINIPATH_IBCC_PHYERRTHRESHOLD_SHIFT;
+ /* use "real" buffer space for */
+ ibc |= 4ULL << INFINIPATH_IBCC_CREDITSCALE_SHIFT;
+ /* IB credit flow control. */
+ ibc |= 0xfULL << INFINIPATH_IBCC_OVERRUNTHRESHOLD_SHIFT;
+ /* initially come up waiting for TS1, without sending anything. */
+ dd->ipath_ibcctrl = ibc;
+ /*
+ * Want to start out with both LINKCMD and LINKINITCMD in NOP
+ * (0 and 0). Don't put linkinitcmd in ipath_ibcctrl, want that
+ * to stay a NOP
+ */
+ ibc |= INFINIPATH_IBCC_LINKINITCMD_DISABLE <<
+ INFINIPATH_IBCC_LINKINITCMD_SHIFT;
+ ipath_cdbg(VERBOSE, "Writing 0x%llx to ibcctrl\n",
+ (unsigned long long) ibc);
+ ipath_write_kreg(dd, dd->ipath_kregs->kr_ibcctrl, ibc);
+
+ // be sure chip saw it
+ val = ipath_read_kreg64(dd, dd->ipath_kregs->kr_scratch);
+
+ ret = dd->ipath_f_bringup_serdes(dd);
+
+ if (ret)
+ dev_info(&dd->pcidev->dev, "Could not initialize SerDes, not "
+ "usable\n");
+ else {
+ dd->ipath_control |= INFINIPATH_C_LINKENABLE; /* enable IBC */
+ ipath_write_kreg(dd, dd->ipath_kregs->kr_control,
+ dd->ipath_control);
+ }
+
+ return ret;
+}
+
+static int init_chip_first(struct ipath_devdata *dd,
+ struct ipath_portdata **pdp)
+{
+ struct ipath_portdata *pd = NULL;
+ int ret = 0;
+ u64 val;
+
+ /*
+ * skip cfgports stuff because we are not allocating memory,
+ * and we don't want problems if the portcnt changed due to
+ * cfgports. We do still check and report a difference, if
+ * not same (should be impossible).
+ */
+ dd->ipath_portcnt =
+ ipath_read_kreg32(dd, dd->ipath_kregs->kr_portcnt);
+ if (!ipath_cfgports)
+ dd->ipath_cfgports = dd->ipath_portcnt;
+ else if (ipath_cfgports <= dd->ipath_portcnt) {
+ dd->ipath_cfgports = ipath_cfgports;
+ ipath_dbg("Configured to use %u ports out of %u in chip\n",
+ dd->ipath_cfgports, dd->ipath_portcnt);
+ } else {
+ dd->ipath_cfgports = dd->ipath_portcnt;
+ ipath_dbg("Tried to configured to use %u ports; chip "
+ "only supports %u\n", ipath_cfgports,
+ dd->ipath_portcnt);
+ }
+ dd->ipath_pd = kzalloc(sizeof(*dd->ipath_pd) * dd->ipath_cfgports,
+ GFP_KERNEL);
+
+ if (!dd->ipath_pd) {
+ ipath_dev_err(dd, "Unable to allocate portdata array, "
+ "failing\n");
+ ret = -ENOMEM;
+ goto done;
+ }
+
+ dd->ipath_lastegrheads = kzalloc(sizeof(*dd->ipath_lastegrheads)
+ * dd->ipath_cfgports,
+ GFP_KERNEL);
+ dd->ipath_lastrcvhdrqtails =
+ kzalloc(sizeof(*dd->ipath_lastrcvhdrqtails)
+ * dd->ipath_cfgports, GFP_KERNEL);
+
+ if (!dd->ipath_lastegrheads || !dd->ipath_lastrcvhdrqtails) {
+ ipath_dev_err(dd, "Unable to allocate head arrays, "
+ "failing\n");
+ ret = -ENOMEM;
+ goto done;
+ }
+
+ dd->ipath_pd[0] = kzalloc(sizeof(*pd), GFP_KERNEL);
+
+ if (!dd->ipath_pd[0]) {
+ ipath_dev_err(dd, "Unable to allocate portdata for port "
+ "0, failing\n");
+ ret = -ENOMEM;
+ goto done;
+ }
+ pd = dd->ipath_pd[0];
+ pd->port_dd = dd;
+ pd->port_port = 0;
+ pd->port_cnt = 1;
+ /* The port 0 pkey table is used by the layer interface. */
+ pd->port_pkeys[0] = IPS_DEFAULT_P_KEY;
+ dd->ipath_rcvtidcnt =
+ ipath_read_kreg32(dd, dd->ipath_kregs->kr_rcvtidcnt);
+ dd->ipath_rcvtidbase =
+ ipath_read_kreg32(dd, dd->ipath_kregs->kr_rcvtidbase);
+ dd->ipath_rcvegrcnt =
+ ipath_read_kreg32(dd, dd->ipath_kregs->kr_rcvegrcnt);
+ dd->ipath_rcvegrbase =
+ ipath_read_kreg32(dd, dd->ipath_kregs->kr_rcvegrbase);
+ dd->ipath_palign =
+ ipath_read_kreg32(dd, dd->ipath_kregs->kr_pagealign);
+ dd->ipath_piobufbase =
+ ipath_read_kreg64(dd, dd->ipath_kregs->kr_sendpiobufbase);
+ val = ipath_read_kreg64(dd, dd->ipath_kregs->kr_sendpiosize);
+ dd->ipath_piosize2k = val & ~0U;
+ dd->ipath_piosize4k = val >> 32;
+ dd->ipath_ibmtu = 4096; /* default to largest legal MTU */
+ val = ipath_read_kreg64(dd, dd->ipath_kregs->kr_sendpiobufcnt);
+ dd->ipath_piobcnt2k = val & ~0U;
+ dd->ipath_piobcnt4k = val >> 32;
+ dd->ipath_pio2kbase =
+ (u32 __iomem *) (((char __iomem *) dd->ipath_kregbase) +
+ (dd->ipath_piobufbase & 0xffffffff));
+ if (dd->ipath_piobcnt4k) {
+ dd->ipath_pio4kbase =
+ (u32 __iomem *) (((char __iomem *)dd->ipath_kregbase) +
+ (dd->ipath_piobufbase >> 32));
+ /*
+ * 4K buffers take 2 pages; we use roundup just to be
+ * paranoid; we calculate it once here, rather than on
+ * ever buf allocate
+ */
+ dd->ipath_4kalign = ALIGN(dd->ipath_piosize4k,
+ dd->ipath_palign);
+ ipath_dbg("%u 2k(%x) piobufs @ %p, %u 4k(%x) @ %p "
+ "(%x aligned)\n",
+ dd->ipath_piobcnt2k, dd->ipath_piosize2k,
+ dd->ipath_pio2kbase, dd->ipath_piobcnt4k,
+ dd->ipath_piosize4k, dd->ipath_pio4kbase,
+ dd->ipath_4kalign);
+ }
+ else ipath_dbg("%u 2k piobufs @ %p\n",
+ dd->ipath_piobcnt2k, dd->ipath_pio2kbase);
+
+ spin_lock_init(&dd->ipath_tid_lock);
+
+done:
+ *pdp = pd;
+ return ret;
+}
+
+/**
+ * init_chip_reset - reset the chip
+ * @dd: the infinipath device
+ * @pdp: output for port data
+ *
+ * sanity check at least some of the values after reset, and
+ * ensure no receive or transmit (explictly, in case reset
+ * failed
+ */
+static int init_chip_reset(struct ipath_devdata *dd,
+ struct ipath_portdata **pdp)
+{
+ struct ipath_portdata *pd;
+ u32 rtmp;
+
+ *pdp = pd = dd->ipath_pd[0];
+ /* ensure chip does no sends or receives while we re-initialize */
+ dd->ipath_control = dd->ipath_sendctrl = dd->ipath_rcvctrl = 0U;
+ ipath_write_kreg(dd, dd->ipath_kregs->kr_rcvctrl, 0);
+ ipath_write_kreg(dd, dd->ipath_kregs->kr_sendctrl, 0);
+ ipath_write_kreg(dd, dd->ipath_kregs->kr_control, 0);
+
+ rtmp = ipath_read_kreg32(dd, dd->ipath_kregs->kr_portcnt);
+ if (dd->ipath_portcnt != rtmp)
+ dev_info(&dd->pcidev->dev, "portcnt was %u before "
+ "reset, now %u, using original\n",
+ dd->ipath_portcnt, rtmp);
+ rtmp = ipath_read_kreg32(dd, dd->ipath_kregs->kr_rcvtidcnt);
+ if (rtmp != dd->ipath_rcvtidcnt)
+ dev_info(&dd->pcidev->dev, "tidcnt was %u before "
+ "reset, now %u, using original\n",
+ dd->ipath_rcvtidcnt, rtmp);
+ rtmp = ipath_read_kreg32(dd, dd->ipath_kregs->kr_rcvtidbase);
+ if (rtmp != dd->ipath_rcvtidbase)
+ dev_info(&dd->pcidev->dev, "tidbase was %u before "
+ "reset, now %u, using original\n",
+ dd->ipath_rcvtidbase, rtmp);
+ rtmp = ipath_read_kreg32(dd, dd->ipath_kregs->kr_rcvegrcnt);
+ if (rtmp != dd->ipath_rcvegrcnt)
+ dev_info(&dd->pcidev->dev, "egrcnt was %u before "
+ "reset, now %u, using original\n",
+ dd->ipath_rcvegrcnt, rtmp);
+ rtmp = ipath_read_kreg32(dd, dd->ipath_kregs->kr_rcvegrbase);
+ if (rtmp != dd->ipath_rcvegrbase)
+ dev_info(&dd->pcidev->dev, "egrbase was %u before "
+ "reset, now %u, using original\n",
+ dd->ipath_rcvegrbase, rtmp);
+
+ return 0;
+}
+
+static int init_pioavailregs(struct ipath_devdata *dd)
+{
+ dma_addr_t dma_addr;
+ u64 val;
+ int ret = 0;
+
+ /*
+ * this has to be page aligned, and on a page of it's own, so we
+ * can map it into user space. We also use it to give processes
+ * a copy of ipath_statusp, on a separate cacheline, followed by
+ * a copy of the freeze error string, if it's happened.
+ * Might also use that space for other things.
+ */
+ val = ALIGN(2 * L1_CACHE_BYTES + sizeof(*dd->ipath_statusp) +
+ dd->ipath_pioavregs * sizeof(u64),
+ 2 * PAGE_SIZE);
+ dd->ipath_pioavailregs_size = val * sizeof(u64);
+ dd->__ipath_pioavailregs_base =
+ pci_alloc_consistent(dd->pcidev, dd->ipath_pioavailregs_size,
+ &dma_addr);
+ if (!dd->__ipath_pioavailregs_base) {
+ ipath_dev_err(dd, "failed to allocate PIOavail reg area "
+ "in memory\n");
+ ret = -ENOMEM;
+ goto done;
+ }
+ if (((unsigned long) dd->__ipath_pioavailregs_base) & (PAGE_SIZE - 1))
+ dd->ipath_pioavailregs_dma = (__le64 *)
+ ALIGN((unsigned long) dd->__ipath_pioavailregs_base,
+ PAGE_SIZE);
+ else
+ dd->ipath_pioavailregs_dma = dd->__ipath_pioavailregs_base;
+ /* stash physical address for user progs */
+ dd->ipath_pioavailregs_phys = dma_addr;
+
+ /*
+ * we really want L2 cache aligned, but for current CPUs of
+ * interest, they are the same.
+ */
+ dd->ipath_statusp =
+ (u64 *) ((char *)dd->ipath_pioavailregs_dma +
+ ((2 * L1_CACHE_BYTES +
+ dd->ipath_pioavregs *
+ sizeof(u64)) & ~L1_CACHE_BYTES));
+ /* copy the current value now that it's really allocated */
+ *dd->ipath_statusp = dd->_ipath_status;
+ /*
+ * setup buffer to hold freeze msg, accessible to apps,
+ * following statusp
+ */
+ dd->ipath_freezemsg = (char *)&dd->ipath_statusp[1];
+ /* and its length */
+ dd->ipath_freezelen = L1_CACHE_BYTES - sizeof(dd->ipath_statusp[0]);
+
+ if (dd->ipath_unit * 64 > (IPATH_PORT0_RCVHDRTAIL_SIZE - 64)) {
+ ipath_dev_err(dd, "unit %u too large for port 0 "
+ "rcvhdrtail buffer size\n", dd->ipath_unit);
+ ret = -ENODEV;
+ }
+
+ /* so we can get current tail in ipath_kreceive(), per chip */
+ dd->ipath_hdrqtailptr = &ipath_port0_rcvhdrtail[
+ dd->ipath_unit * (64 / sizeof(*ipath_port0_rcvhdrtail))];
+done:
+ return ret;
+}
+
+/**
+ * init_shadow_tids - allocate the shadow TID array
+ * @dd: the infinipath device
+ *
+ * allocate the shadow TID array, so we can ipath_munlock previous
+ * entries. It may make more sense to move the pageshadow to the
+ * port data structure, so we only allocate memory for ports actually
+ * in use, since we at 8k per port, now.
+ */
+static void init_shadow_tids(struct ipath_devdata *dd)
+{
+ dd->ipath_pageshadow = (struct page **)
+ vmalloc(dd->ipath_cfgports * dd->ipath_rcvtidcnt *
+ sizeof(struct page *));
+ if (!dd->ipath_pageshadow)
+ ipath_dev_err(dd, "failed to allocate shadow page * "
+ "array, no expected sends!\n");
+ else
+ memset(dd->ipath_pageshadow, 0,
+ dd->ipath_cfgports * dd->ipath_rcvtidcnt *
+ sizeof(struct page *));
+}
+
+static void enable_chip(struct ipath_devdata *dd,
+ struct ipath_portdata *pd, int reinit)
+{
+ u32 val;
+ int i;
+
+ if (!reinit) {
+ init_waitqueue_head(&ipath_sma_wait);
+ init_waitqueue_head(&ipath_sma_state_wait);
+ }
+
+ ipath_write_kreg(dd, dd->ipath_kregs->kr_rcvctrl,
+ dd->ipath_rcvctrl);
+
+ /* Enable PIO send, and update of PIOavail regs to memory. */
+ dd->ipath_sendctrl = INFINIPATH_S_PIOENABLE |
+ INFINIPATH_S_PIOBUFAVAILUPD;
+ ipath_write_kreg(dd, dd->ipath_kregs->kr_sendctrl,
+ dd->ipath_sendctrl);
+
+ /*
+ * enable port 0 receive, and receive interrupt. other ports
+ * done as user opens and inits them.
+ */
+ dd->ipath_rcvctrl = INFINIPATH_R_TAILUPD |
+ (1ULL << INFINIPATH_R_PORTENABLE_SHIFT) |
+ (1ULL << INFINIPATH_R_INTRAVAIL_SHIFT);
+ ipath_write_kreg(dd, dd->ipath_kregs->kr_rcvctrl,
+ dd->ipath_rcvctrl);
+
+ /*
+ * now ready for use. this should be cleared whenever we
+ * detect a reset, or initiate one.
+ */
+ dd->ipath_flags |= IPATH_INITTED;
+
+ /*
+ * init our shadow copies of head from tail values, and write
+ * head values to match.
+ */
+ val = ipath_read_ureg32(dd, ur_rcvegrindextail, 0);
+ (void)ipath_write_ureg(dd, ur_rcvegrindexhead, val, 0);
+ dd->ipath_port0head = ipath_read_ureg32(dd, ur_rcvhdrtail, 0);
+
+ /* Initialize so we interrupt on next packet received */
+ (void)ipath_write_ureg(dd, ur_rcvhdrhead,
+ dd->ipath_rhdrhead_intr_off
+ | dd->ipath_port0head, 0);
+
+ /*
+ * by now pioavail updates to memory should have occurred, so
+ * copy them into our working/shadow registers; this is in
+ * case something went wrong with abort, but mostly to get the
+ * initial values of the generation bit correct.
+ */
+ for (i = 0; i < dd->ipath_pioavregs; i++) {
+ /* Chip Errata bug 6641; even and odd qwords>3 are swapped */
+ if (i > 3) {
+ if (i & 1)
+ dd->ipath_pioavailshadow[i] =
+ __le64_to_cpu(dd->ipath_pioavailregs_dma[i - 1]);
+ else
+ dd->ipath_pioavailshadow[i] =
+ __le64_to_cpu(dd->ipath_pioavailregs_dma[i + 1]);
+ } else
+ dd->ipath_pioavailshadow[i] =
+ __le64_to_cpu(dd->ipath_pioavailregs_dma[i]);
+ }
+ /* can get counters, stats, etc. */
+ dd->ipath_flags |= IPATH_PRESENT;
+}
+
+static int init_housekeeping(struct ipath_devdata *dd,
+ struct ipath_portdata **pdp, int reinit)
+{
+ char boardn[32];
+ int ret = 0;
+
+ /*
+ * have to clear shadow copies of registers at init that are
+ * not otherwise set here, or all kinds of bizarre things
+ * happen with driver on chip reset
+ */
+ dd->ipath_rcvhdrsize = 0;
+
+ /*
+ * Don't clear ipath_flags as 8bit mode was set before
+ * entering this func. However, we do set the linkstate to
+ * unknown, so we can watch for a transition.
+ */
+ dd->ipath_flags |= IPATH_LINKUNK;
+ dd->ipath_flags &= ~(IPATH_LINKACTIVE | IPATH_LINKARMED |
+ IPATH_LINKDOWN | IPATH_LINKINIT);
+
+ ipath_cdbg(VERBOSE, "Try to read spc chip revision\n");
+ dd->ipath_revision =
+ ipath_read_kreg64(dd, dd->ipath_kregs->kr_revision);
+
+ /*
+ * set up fundamental info we need to use the chip; we assume
+ * if the revision reg and these regs are OK, we don't need to
+ * special case the rest
+ */
+ dd->ipath_sregbase =
+ ipath_read_kreg32(dd, dd->ipath_kregs->kr_sendregbase);
+ dd->ipath_cregbase =
+ ipath_read_kreg32(dd, dd->ipath_kregs->kr_counterregbase);
+ dd->ipath_uregbase =
+ ipath_read_kreg32(dd, dd->ipath_kregs->kr_userregbase);
+ ipath_cdbg(VERBOSE, "ipath_kregbase %p, sendbase %x usrbase %x, "
+ "cntrbase %x\n", dd->ipath_kregbase, dd->ipath_sregbase,
+ dd->ipath_uregbase, dd->ipath_cregbase);
+ if ((dd->ipath_revision & 0xffffffff) == 0xffffffff
+ || (dd->ipath_sregbase & 0xffffffff) == 0xffffffff
+ || (dd->ipath_cregbase & 0xffffffff) == 0xffffffff
+ || (dd->ipath_uregbase & 0xffffffff) == 0xffffffff) {
+ ipath_dev_err(dd, "Register read failures from chip, "
+ "giving up initialization\n");
+ ret = -ENODEV;
+ goto done;
+ }
+
+ /* clear the initial reset flag, in case first driver load */
+ ipath_write_kreg(dd, dd->ipath_kregs->kr_errorclear, INFINIPATH_E_RESET);
+
+ if (reinit)
+ ret = init_chip_reset(dd, pdp);
+ else
+ ret = init_chip_first(dd, pdp);
+
+ if (ret)
+ goto done;
+
+ ipath_cdbg(VERBOSE, "Revision %llx (PCI %x), %u ports, %u tids, "
+ "%u egrtids\n",
+ (unsigned long long) dd->ipath_revision, dd->ipath_pcirev,
+ dd->ipath_portcnt, dd->ipath_rcvtidcnt, dd->ipath_rcvegrcnt);
+
+ if (((dd->ipath_revision >> INFINIPATH_R_SOFTWARE_SHIFT) &
+ INFINIPATH_R_SOFTWARE_MASK) != IPATH_CHIP_SWVERSION) {
+ ipath_dev_err(dd, "Driver only handles version %d, "
+ "chip swversion is %d (%llx), failng\n",
+ IPATH_CHIP_SWVERSION,
+ (int)(dd->ipath_revision >>
+ INFINIPATH_R_SOFTWARE_SHIFT) &
+ INFINIPATH_R_SOFTWARE_MASK,
+ (unsigned long long) dd->ipath_revision);
+ ret = -ENOSYS;
+ goto done;
+ }
+ dd->ipath_majrev = (u8) ((dd->ipath_revision >>
+ INFINIPATH_R_CHIPREVMAJOR_SHIFT) &
+ INFINIPATH_R_CHIPREVMAJOR_MASK);
+ dd->ipath_minrev = (u8) ((dd->ipath_revision >>
+ INFINIPATH_R_CHIPREVMINOR_SHIFT) &
+ INFINIPATH_R_CHIPREVMINOR_MASK);
+ dd->ipath_boardrev = (u8) ((dd->ipath_revision >>
+ INFINIPATH_R_BOARDID_SHIFT) &
+ INFINIPATH_R_BOARDID_MASK);
+
+ ret = dd->ipath_f_get_boardname(dd, boardn, sizeof boardn);
+
+ snprintf(dd->ipath_boardversion, sizeof(dd->ipath_boardversion),
+ "Driver %u.%u, %s, InfiniPath%u %u.%u, PCI %u, "
+ "SW Compat %u\n",
+ IPATH_CHIP_VERS_MAJ, IPATH_CHIP_VERS_MIN, boardn,
+ (unsigned)(dd->ipath_revision >> INFINIPATH_R_ARCH_SHIFT) &
+ INFINIPATH_R_ARCH_MASK,
+ dd->ipath_majrev, dd->ipath_minrev, dd->ipath_pcirev,
+ (unsigned)(dd->ipath_revision >>
+ INFINIPATH_R_SOFTWARE_SHIFT) &
+ INFINIPATH_R_SOFTWARE_MASK);
+
+ ipath_dbg("%s", dd->ipath_boardversion);
+
+done:
+ return ret;
+}
+
+
+/**
+ * ipath_init_chip - do the actual initialization sequence on the chip
+ * @dd: the infinipath device
+ * @reinit: reinitializing, so don't allocate new memory
+ *
+ * Do the actual initialization sequence on the chip. This is done
+ * both from the init routine called from the PCI infrastructure, and
+ * when we reset the chip, or detect that it was reset internally.
+ * Memory allocation here and in called routines is only done in
+ * the first case (reinit == 0). We have to be careful, because even
+ * without memory allocation, we need to re-write all the chip registers
+ * TIDs, etc. after the reset has completed.
+ */
+int ipath_init_chip(struct ipath_devdata *dd, int reinit)
+{
+ int ret = 0, i;
+ u32 val32, kpiobufs;
+ u64 val, atmp;
+ struct ipath_portdata *pd = NULL; /* keep gcc4 happy */
+
+ ret = init_housekeeping(dd, &pd, reinit);
+ if (ret)
+ goto done;
+
+ /*
+ * we ignore most issues after reporting them, but have to specially
+ * handle hardware-disabled chips.
+ */
+ if (ret == 2) {
+ ret = -EPERM; /* unique error, known to infinipath_init_one */
+ goto done;
+ }
+
+ /*
+ * We could bump this to allow for full rcvegrcnt + rcvtidcnt,
+ * but then it no longer nicely fits power of two, and since
+ * we now use routines that backend onto __get_free_pages, the
+ * rest would be wasted.
+ */
+ dd->ipath_rcvhdrcnt = dd->ipath_rcvegrcnt;
+ ipath_write_kreg(dd, dd->ipath_kregs->kr_rcvhdrcnt,
+ dd->ipath_rcvhdrcnt);
+
+ /*
+ * Set up the shadow copies of the piobufavail registers,
+ * which we compare against the chip registers for now, and
+ * the in memory DMA'ed copies of the registers. This has to
+ * be done early, before we calculate lastport, etc.
+ */
+ val = dd->ipath_piobcnt2k + dd->ipath_piobcnt4k;
+ /*
+ * calc number of pioavail registers, and save it; we have 2
+ * bits per buffer.
+ */
+ dd->ipath_pioavregs = ALIGN(val, sizeof(u64) * BITS_PER_BYTE / 2)
+ / (sizeof(u64) * BITS_PER_BYTE / 2);
+ if (!ipath_kpiobufs) /* have to have at least 1, for SMA */
+ kpiobufs = ipath_kpiobufs = 1;
+ else if ((dd->ipath_piobcnt2k + dd->ipath_piobcnt4k) <
+ (dd->ipath_cfgports * IPATH_MIN_USER_PORT_BUFCNT)) {
+ dev_info(&dd->pcidev->dev, "Too few PIO buffers (%u) "
+ "for %u ports to have %u each!\n",
+ dd->ipath_piobcnt2k + dd->ipath_piobcnt4k,
+ dd->ipath_cfgports, IPATH_MIN_USER_PORT_BUFCNT);
+ kpiobufs = 1; /* reserve just the minimum for SMA/ether */
+ } else
+ kpiobufs = ipath_kpiobufs;
+
+ if (kpiobufs >
+ (dd->ipath_piobcnt2k + dd->ipath_piobcnt4k -
+ (dd->ipath_cfgports * IPATH_MIN_USER_PORT_BUFCNT))) {
+ i = dd->ipath_piobcnt2k + dd->ipath_piobcnt4k -
+ (dd->ipath_cfgports * IPATH_MIN_USER_PORT_BUFCNT);
+ if (i < 0)
+ i = 0;
+ dev_info(&dd->pcidev->dev, "Allocating %d PIO bufs for "
+ "kernel leaves too few for %d user ports "
+ "(%d each); using %u\n", kpiobufs,
+ dd->ipath_cfgports - 1,
+ IPATH_MIN_USER_PORT_BUFCNT, i);
+ /*
+ * shouldn't change ipath_kpiobufs, because could be
+ * different for different devices...
+ */
+ kpiobufs = i;
+ }
+ dd->ipath_lastport_piobuf =
+ dd->ipath_piobcnt2k + dd->ipath_piobcnt4k - kpiobufs;
+ dd->ipath_pbufsport =
+ dd->ipath_cfgports >
+ 1 ? dd->ipath_lastport_piobuf / (dd->ipath_cfgports - 1) : 0;
+ val32 = dd->ipath_lastport_piobuf -
+ (dd->ipath_pbufsport * (dd->ipath_cfgports - 1));
+ if (val32 > 0) {
+ ipath_dbg("allocating %u pbufs/port leaves %u unused, "
+ "add to kernel\n", dd->ipath_pbufsport, val32);
+ dd->ipath_lastport_piobuf -= val32;
+ ipath_dbg("%u pbufs/port leaves %u unused, add to kernel\n",
+ dd->ipath_pbufsport, val32);
+ }
+ dd->ipath_lastpioindex = dd->ipath_lastport_piobuf;
+ ipath_cdbg(VERBOSE, "%d PIO bufs for kernel out of %d total %u "
+ "each for %u user ports\n", kpiobufs,
+ dd->ipath_piobcnt2k + dd->ipath_piobcnt4k,
+ dd->ipath_pbufsport, dd->ipath_cfgports - 1);
+
+ dd->ipath_f_early_init(dd);
+
+ /* early_init sets rcvhdrentsize and rcvhdrsize, so this must be
+ * done after early_init */
+ dd->ipath_hdrqlast =
+ dd->ipath_rcvhdrentsize * (dd->ipath_rcvhdrcnt - 1);
+ ipath_write_kreg(dd, dd->ipath_kregs->kr_rcvhdrentsize,
+ dd->ipath_rcvhdrentsize);
+ ipath_write_kreg(dd, dd->ipath_kregs->kr_rcvhdrsize,
+ dd->ipath_rcvhdrsize);
+
+ if (!reinit) {
+ ret = init_pioavailregs(dd);
+ init_shadow_tids(dd);
+ if (ret)
+ goto done;
+ }
+
+ (void)ipath_write_kreg(dd, dd->ipath_kregs->kr_sendpioavailaddr,
+ dd->ipath_pioavailregs_phys);
+ /*
+ * this is to detect s/w errors, which the h/w works around by
+ * ignoring the low 6 bits of address, if it wasn't aligned.
+ */
+ val = ipath_read_kreg64(dd, dd->ipath_kregs->kr_sendpioavailaddr);
+ if (val != dd->ipath_pioavailregs_phys) {
+ ipath_dev_err(dd, "Catastrophic software error, "
+ "SendPIOAvailAddr written as %lx, "
+ "read back as %llx\n",
+ (unsigned long) dd->ipath_pioavailregs_phys,
+ (unsigned long long) val);
+ ret = -EINVAL;
+ goto done;
+ }
+
+ val = ipath_port0_rcvhdrtail_dma + dd->ipath_unit * 64;
+
+ /* verify that the alignment requirement was met */
+ ipath_write_kreg_port(dd, dd->ipath_kregs->kr_rcvhdrtailaddr, 0, val);
+ atmp = ipath_read_kreg64_port(dd,
+ dd->ipath_kregs->kr_rcvhdrtailaddr, 0);
+ if (val != atmp) {
+ ipath_dev_err(dd, "Catastrophic software error, "
+ "RcvHdrTailAddr0 written as %llx, "
+ "read back as %llx from %x\n", (unsigned long long) val, (unsigned long long) atmp,
+ dd->ipath_kregs->kr_rcvhdrtailaddr);
+ ret = -EINVAL;
+ goto done;
+ }
+
+ ipath_write_kreg(dd, dd->ipath_kregs->kr_rcvbthqp, IPATH_KD_QP);
+
+ /*
+ * make sure we are not in freeze, and PIO send enabled, so
+ * writes to pbc happen
+ */
+ ipath_write_kreg(dd, dd->ipath_kregs->kr_hwerrmask, 0ULL);
+ ipath_write_kreg(dd, dd->ipath_kregs->kr_hwerrclear, -1LL);
+ ipath_write_kreg(dd, dd->ipath_kregs->kr_control, 0ULL);
+ ipath_write_kreg(dd, dd->ipath_kregs->kr_sendctrl,
+ INFINIPATH_S_PIOENABLE);
+
+ /*
+ * before error clears, since we expect serdes pll errors during
+ * this, the first time after reset
+ */
+ if (bringup_link(dd)) {
+ dev_info(&dd->pcidev->dev, "Failed to bringup IB link\n");
+ ret = -ENETDOWN;
+ goto done;
+ }
+
+ /*
+ * clear any "expected" hwerrs from reset and/or initialization
+ * clear any that aren't enabled (at least this once), and then
+ * set the enable mask
+ */
+ dd->ipath_f_init_hwerrors(dd);
+ ipath_write_kreg(dd, dd->ipath_kregs->kr_hwerrclear, -1LL);
+ ipath_write_kreg(dd, dd->ipath_kregs->kr_hwerrmask,
+ dd->ipath_hwerrmask);
+
+ dd->ipath_maskederrs = dd->ipath_ignorederrs;
+ /* clear all */
+ ipath_write_kreg(dd, dd->ipath_kregs->kr_errorclear, -1LL);
+ /* enable errors that are masked, at least this first time. */
+ ipath_write_kreg(dd, dd->ipath_kregs->kr_errormask,
+ ~dd->ipath_maskederrs);
+ /* clear any interrups up to this point (ints still not enabled) */
+ ipath_write_kreg(dd, dd->ipath_kregs->kr_intclear, -1LL);
+
+ ipath_stats.sps_lid[dd->ipath_unit] = dd->ipath_lid;
+
+ /*
+ * Set up the port 0 (kernel) rcvhdr q and egr TIDs. If doing
+ * re-init, the simplest way to handle this is to free
+ * existing, and re-allocate.
+ */
+ if (reinit)
+ ipath_free_pddata(dd, 0, 0);
+ dd->ipath_f_tidtemplate(dd);
+ ret = ipath_create_rcvhdrq(dd, pd);
+ if (!ret)
+ ret = create_port0_egr(dd);
+ if (ret)
+ ipath_dev_err(dd, "failed to allocate port 0 (kernel) "
+ "rcvhdrq and/or egr bufs\n");
+ else
+ enable_chip(dd, pd, reinit);
+
+ /*
+ * cause retrigger of pending interrupts ignored during init,
+ * even if we had errors
+ */
+ ipath_write_kreg(dd, dd->ipath_kregs->kr_intclear, 0ULL);
+
+ if (!reinit) {
+ /*
+ * set up stats retrieval timer, even if we had errors
+ * in last portion of setup
+ */
+ init_timer(&dd->ipath_stats_timer);
+ dd->ipath_stats_timer.function = ipath_get_faststats;
+ dd->ipath_stats_timer.data = (unsigned long) dd;
+ /* every 5 seconds; */
+ dd->ipath_stats_timer.expires = jiffies + 5 * HZ;
+ /* takes ~16 seconds to overflow at full IB 4x bandwdith */
+ add_timer(&dd->ipath_stats_timer);
+ dd->ipath_stats_timer_active = 1;
+ }
+
+done:
+ if (!ret) {
+ ipath_get_guid(dd);
+ *dd->ipath_statusp |= IPATH_STATUS_CHIP_PRESENT;
+ if (!ipath_sma_data_spare) {
+ /*
+ * first init, setup SMA data structs
+ */
+ ipath_sma_data_spare =
+ ipath_sma_data_bufs[IPATH_NUM_SMA_PKTS];
+ for (i = 0; i < IPATH_NUM_SMA_PKTS; i++)
+ ipath_sma_data[i].buf = ipath_sma_data_bufs[i];
+ }
+ if (reinit) {
+ /*
+ * otherwise done in init_one, after some other setup
+ */
+ if (!dd->ipath_f_intrsetup(dd)) {
+ /* now we can enable all interrupts from
+ the chip */
+ ipath_write_kreg(dd, dd->ipath_kregs->kr_intmask,
+ ~0ULL);
+ /* force re-interrupt of any pending
+ interrupts. */
+ ipath_write_kreg(dd, dd->ipath_kregs->kr_intclear,
+ 0ULL);
+ /* OK, the chip is usable, marked it
+ as initialized */
+ *dd->ipath_statusp |= IPATH_STATUS_INITTED;
+ } else
+ ipath_dev_err(dd,
+ "Can't enable interrupts on re-init\n");
+ } else if (dd->ipath_cfgports > ipath_stats.sps_nports) {
+ /*
+ * sps_nports is a global, so, we set it to
+ * the highest number of ports of any of the
+ * chips we find; we never decrement it, at
+ * least for now.
+ */
+ ipath_stats.sps_nports = dd->ipath_cfgports;
+ }
+ } else
+ ipath_dbg("Failed (%d) to initialize chip\n", ret);
+
+ /* if ret is non-zero, we probably should do some cleanup
+ here... */
+ return ret;
+}
+
+static int ipath_set_kpiobufs(const char *str, struct kernel_param *kp)
+{
+ unsigned short val;
+ int ret, i;
+
+ ret = ipath_parse_ushort(str, &val);
+
+ if (ret < 0)
+ goto bail;
+
+ if (val == 0) {
+ ret = -EINVAL;
+ goto bail;
+ }
+
+ for (i = 0; i < atomic_read(&ipath_max); i++) {
+ struct ipath_devdata *dd = ipath_lookup(i);
+
+ if (!dd || dd->ipath_kregbase)
+ continue;
+ if (val > (dd->ipath_piobcnt2k + dd->ipath_piobcnt4k -
+ (dd->ipath_cfgports * IPATH_MIN_USER_PORT_BUFCNT)))
+ {
+ ipath_dev_err(dd,
+ "Allocating %d PIO bufs for kernel leaves "
+ "too few for %d user ports (%d each)\n", val,
+ dd->ipath_cfgports - 1,
+ IPATH_MIN_USER_PORT_BUFCNT);
+ ret = -EINVAL;
+ goto bail;
+ }
+ dd->ipath_lastport_piobuf =
+ dd->ipath_piobcnt2k + dd->ipath_piobcnt4k - val;
+ }
+
+ ret = 0;
+bail:
+ return ret;
+}
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