ipath_init_chip.c

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 * 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,
 * or it's administratively re-enabled.
 *
 * 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 or enable has completed.
 */
int ipath_init_chip(struct ipath_devdata *dd, int reinit)
{
	int ret = 0, i;
	u32 val32, kpiobufs;
	u32 piobufs, uports;
	u64 val;
	struct ipath_portdata *pd = NULL; /* keep gcc4 happy */
	gfp_t gfp_flags = GFP_USER | __GFP_COMP;

	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) {
		/* unique error, known to ipath_init_one */
		ret = -EPERM;
		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.
	 */
	piobufs = dd->ipath_piobcnt2k + dd->ipath_piobcnt4k;
	/*
	 * calc number of pioavail registers, and save it; we have 2
	 * bits per buffer.
	 */
	dd->ipath_pioavregs = ALIGN(piobufs, sizeof(u64) * BITS_PER_BYTE / 2)
		/ (sizeof(u64) * BITS_PER_BYTE / 2);
	uports = dd->ipath_cfgports ? dd->ipath_cfgports - 1 : 0;
	if (ipath_kpiobufs == 0) {
		/* not set by user (this is default) */
		if (piobufs > 144)
			kpiobufs = 32;
		else
			kpiobufs = 16;
	}
	else
		kpiobufs = ipath_kpiobufs;

	if (kpiobufs + (uports * IPATH_MIN_USER_PORT_BUFCNT) > piobufs) {
		i = (int) piobufs -
			(int) (uports * IPATH_MIN_USER_PORT_BUFCNT);
		if (i < 0)
			i = 0;
		dev_info(&dd->pcidev->dev, "Allocating %d PIO bufs of "
			 "%d for kernel leaves too few for %d user ports "
			 "(%d each); using %u\n", kpiobufs,
			 piobufs, uports, IPATH_MIN_USER_PORT_BUFCNT, i);
		/*
		 * shouldn't change ipath_kpiobufs, because could be
		 * different for different devices...
		 */
		kpiobufs = i;
	}
	dd->ipath_lastport_piobuf = piobufs - kpiobufs;
	dd->ipath_pbufsport =
		uports ? dd->ipath_lastport_piobuf / uports : 0;
	val32 = dd->ipath_lastport_piobuf - (dd->ipath_pbufsport * uports);
	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,
		   piobufs, dd->ipath_pbufsport, uports);

	dd->ipath_f_early_init(dd);
	/*
	 * cancel any possible active sends from early driver load.
	 * Follows early_init because some chips have to initialize
	 * PIO buffers in early_init to avoid false parity errors.
	 */
	ipath_cancel_sends(dd, 0);

	/* 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;
	}

	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,
			 ~0ULL&~INFINIPATH_HWE_MEMBISTFAILED);
	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,
			 ~0ULL&~INFINIPATH_HWE_MEMBISTFAILED);
	ipath_write_kreg(dd, dd->ipath_kregs->kr_hwerrmask,
			 dd->ipath_hwerrmask);

	/* 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);
	dd->ipath_errormask = ipath_read_kreg64(dd,
		dd->ipath_kregs->kr_errormask);
	/* clear any interrupts up to this point (ints still not enabled) */
	ipath_write_kreg(dd, dd->ipath_kregs->kr_intclear, -1LL);

	/*
	 * 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.
	 * Need to re-create rest of port 0 portdata as well.
	 */
	if (reinit) {
		/* Alloc and init new ipath_portdata for port0,
		 * Then free old pd. Could lead to fragmentation, but also
		 * makes later support for hot-swap easier.
		 */
		struct ipath_portdata *npd;
		npd = create_portdata0(dd);
		if (npd) {
			ipath_free_pddata(dd, pd);
			dd->ipath_pd[0] = pd = npd;
		} else {
			ipath_dev_err(dd, "Unable to allocate portdata for"
				      "  port 0, failing\n");
			ret = -ENOMEM;
			goto done;
		}
	}
	dd->ipath_f_tidtemplate(dd);
	ret = ipath_create_rcvhdrq(dd, pd);
	if (!ret) {
		dd->ipath_hdrqtailptr =
			(volatile __le64 *)pd->port_rcvhdrtail_kvaddr;
		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);


	if (!ret && !reinit) {
	    /* used when we close a port, for DMA already in flight at close */
		dd->ipath_dummy_hdrq = dma_alloc_coherent(
			&dd->pcidev->dev, pd->port_rcvhdrq_size,
			&dd->ipath_dummy_hdrq_phys,
			gfp_flags);
		if (!dd->ipath_dummy_hdrq ) {
			dev_info(&dd->pcidev->dev,
				"Couldn't allocate 0x%lx bytes for dummy hdrq\n",
				pd->port_rcvhdrq_size);
			/* fallback to just 0'ing */
			dd->ipath_dummy_hdrq_phys = 0UL;
		}
	}

	/*
	 * cause retrigger of pending interrupts ignored during init,
	 * even if we had errors
	 */
	ipath_write_kreg(dd, dd->ipath_kregs->kr_intclear, 0ULL);

	if(!dd->ipath_stats_timer_active) {
		/*
		 * first init, or after an admin disable/enable
		 * 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) {
		*dd->ipath_statusp |= IPATH_STATUS_CHIP_PRESENT;
		if (!dd->ipath_f_intrsetup(dd)) {
			/* now we can enable all interrupts from the chip */
			ipath_write_kreg(dd, dd->ipath_kregs->kr_intmask,
					 -1LL);
			/* force re-interrupt of any pending interrupts. */
			ipath_write_kreg(dd, dd->ipath_kregs->kr_intclear,
					 0ULL);
			/* chip is usable; mark it as initialized */
			*dd->ipath_statusp |= IPATH_STATUS_INITTED;
		} else
			ipath_dev_err(dd, "No interrupts enabled, couldn't "
				      "setup interrupt address\n");

		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.  Since this might have changed
			 * over disable/enable or prior to reset, always
			 * do the check and potentially adjust.
			 */
			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)
{
	struct ipath_devdata *dd;
	unsigned long flags;
	unsigned short val;
	int ret;

	ret = ipath_parse_ushort(str, &val);

	spin_lock_irqsave(&ipath_devs_lock, flags);

	if (ret < 0)
		goto bail;

	if (val == 0) {
		ret = -EINVAL;
		goto bail;
	}

	list_for_each_entry(dd, &ipath_dev_list, ipath_list) {
		if (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;
	}

	ipath_kpiobufs = val;
	ret = 0;
bail:
	spin_unlock_irqrestore(&ipath_devs_lock, flags);

	return ret;
}