Linux-libre 4.7.1-gnupck-4.7.1-gnu

1 files changed, 1338 insertions, 0 deletions

diff --git a/drivers/infiniband/hw/hfi1/pcie.c b/drivers/infiniband/hw/hfi1/pcie.c
new file mode 100644
index 000000000..0bac21e6a
--- /dev/null
+++ b/drivers/infiniband/hw/hfi1/pcie.c
@@ -0,0 +1,1338 @@
+/*
+ * Copyright(c) 2015, 2016 Intel Corporation.
+ *
+ * This file is provided under a dual BSD/GPLv2 license.  When using or
+ * redistributing this file, you may do so under either license.
+ *
+ * GPL LICENSE SUMMARY
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * BSD LICENSE
+ *
+ * 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.
+ *  - Neither the name of Intel Corporation nor the names of its
+ *    contributors may be used to endorse or promote products derived
+ *    from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#include <linux/pci.h>
+#include <linux/io.h>
+#include <linux/delay.h>
+#include <linux/vmalloc.h>
+#include <linux/aer.h>
+#include <linux/module.h>
+
+#include "hfi.h"
+#include "chip_registers.h"
+#include "aspm.h"
+
+/* link speed vector for Gen3 speed - not in Linux headers */
+#define GEN1_SPEED_VECTOR 0x1
+#define GEN2_SPEED_VECTOR 0x2
+#define GEN3_SPEED_VECTOR 0x3
+
+/*
+ * This file contains PCIe utility routines.
+ */
+
+/*
+ * Code to adjust PCIe capabilities.
+ */
+static void tune_pcie_caps(struct hfi1_devdata *);
+
+/*
+ * Do all the common PCIe setup and initialization.
+ * devdata is not yet allocated, and is not allocated until after this
+ * routine returns success.  Therefore dd_dev_err() can't be used for error
+ * printing.
+ */
+int hfi1_pcie_init(struct pci_dev *pdev, const struct pci_device_id *ent)
+{
+	int ret;
+
+	ret = pci_enable_device(pdev);
+	if (ret) {
+		/*
+		 * This can happen (in theory) iff:
+		 * We did a chip reset, and then failed to reprogram the
+		 * BAR, or the chip reset due to an internal error.  We then
+		 * unloaded the driver and reloaded it.
+		 *
+		 * Both reset cases set the BAR back to initial state.  For
+		 * the latter case, the AER sticky error bit at offset 0x718
+		 * should be set, but the Linux kernel doesn't yet know
+		 * about that, it appears.  If the original BAR was retained
+		 * in the kernel data structures, this may be OK.
+		 */
+		hfi1_early_err(&pdev->dev, "pci enable failed: error %d\n",
+			       -ret);
+		goto done;
+	}
+
+	ret = pci_request_regions(pdev, DRIVER_NAME);
+	if (ret) {
+		hfi1_early_err(&pdev->dev,
+			       "pci_request_regions fails: err %d\n", -ret);
+		goto bail;
+	}
+
+	ret = pci_set_dma_mask(pdev, DMA_BIT_MASK(64));
+	if (ret) {
+		/*
+		 * If the 64 bit setup fails, try 32 bit.  Some systems
+		 * do not setup 64 bit maps on systems with 2GB or less
+		 * memory installed.
+		 */
+		ret = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
+		if (ret) {
+			hfi1_early_err(&pdev->dev,
+				       "Unable to set DMA mask: %d\n", ret);
+			goto bail;
+		}
+		ret = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
+	} else {
+		ret = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64));
+	}
+	if (ret) {
+		hfi1_early_err(&pdev->dev,
+			       "Unable to set DMA consistent mask: %d\n", ret);
+		goto bail;
+	}
+
+	pci_set_master(pdev);
+	(void)pci_enable_pcie_error_reporting(pdev);
+	goto done;
+
+bail:
+	hfi1_pcie_cleanup(pdev);
+done:
+	return ret;
+}
+
+/*
+ * Clean what was done in hfi1_pcie_init()
+ */
+void hfi1_pcie_cleanup(struct pci_dev *pdev)
+{
+	pci_disable_device(pdev);
+	/*
+	 * Release regions should be called after the disable. OK to
+	 * call if request regions has not been called or failed.
+	 */
+	pci_release_regions(pdev);
+}
+
+/*
+ * Do remaining PCIe setup, once dd is allocated, and save away
+ * fields required to re-initialize after a chip reset, or for
+ * various other purposes
+ */
+int hfi1_pcie_ddinit(struct hfi1_devdata *dd, struct pci_dev *pdev,
+		     const struct pci_device_id *ent)
+{
+	unsigned long len;
+	resource_size_t addr;
+
+	dd->pcidev = pdev;
+	pci_set_drvdata(pdev, dd);
+
+	addr = pci_resource_start(pdev, 0);
+	len = pci_resource_len(pdev, 0);
+
+	/*
+	 * The TXE PIO buffers are at the tail end of the chip space.
+	 * Cut them off and map them separately.
+	 */
+
+	/* sanity check vs expectations */
+	if (len != TXE_PIO_SEND + TXE_PIO_SIZE) {
+		dd_dev_err(dd, "chip PIO range does not match\n");
+		return -EINVAL;
+	}
+
+	dd->kregbase = ioremap_nocache(addr, TXE_PIO_SEND);
+	if (!dd->kregbase)
+		return -ENOMEM;
+
+	dd->piobase = ioremap_wc(addr + TXE_PIO_SEND, TXE_PIO_SIZE);
+	if (!dd->piobase) {
+		iounmap(dd->kregbase);
+		return -ENOMEM;
+	}
+
+	dd->flags |= HFI1_PRESENT;	/* now register routines work */
+
+	dd->kregend = dd->kregbase + TXE_PIO_SEND;
+	dd->physaddr = addr;        /* used for io_remap, etc. */
+
+	/*
+	 * Re-map the chip's RcvArray as write-combining to allow us
+	 * to write an entire cacheline worth of entries in one shot.
+	 * If this re-map fails, just continue - the RcvArray programming
+	 * function will handle both cases.
+	 */
+	dd->chip_rcv_array_count = read_csr(dd, RCV_ARRAY_CNT);
+	dd->rcvarray_wc = ioremap_wc(addr + RCV_ARRAY,
+				     dd->chip_rcv_array_count * 8);
+	dd_dev_info(dd, "WC Remapped RcvArray: %p\n", dd->rcvarray_wc);
+	/*
+	 * Save BARs and command to rewrite after device reset.
+	 */
+	dd->pcibar0 = addr;
+	dd->pcibar1 = addr >> 32;
+	pci_read_config_dword(dd->pcidev, PCI_ROM_ADDRESS, &dd->pci_rom);
+	pci_read_config_word(dd->pcidev, PCI_COMMAND, &dd->pci_command);
+	pcie_capability_read_word(dd->pcidev, PCI_EXP_DEVCTL, &dd->pcie_devctl);
+	pcie_capability_read_word(dd->pcidev, PCI_EXP_LNKCTL, &dd->pcie_lnkctl);
+	pcie_capability_read_word(dd->pcidev, PCI_EXP_DEVCTL2,
+				  &dd->pcie_devctl2);
+	pci_read_config_dword(dd->pcidev, PCI_CFG_MSIX0, &dd->pci_msix0);
+	pci_read_config_dword(dd->pcidev, PCIE_CFG_SPCIE1, &dd->pci_lnkctl3);
+	pci_read_config_dword(dd->pcidev, PCIE_CFG_TPH2, &dd->pci_tph2);
+
+	return 0;
+}
+
+/*
+ * Do PCIe cleanup related to dd, after chip-specific cleanup, etc.  Just prior
+ * to releasing the dd memory.
+ * Void because all of the core pcie cleanup functions are void.
+ */
+void hfi1_pcie_ddcleanup(struct hfi1_devdata *dd)
+{
+	u64 __iomem *base = (void __iomem *)dd->kregbase;
+
+	dd->flags &= ~HFI1_PRESENT;
+	dd->kregbase = NULL;
+	iounmap(base);
+	if (dd->rcvarray_wc)
+		iounmap(dd->rcvarray_wc);
+	if (dd->piobase)
+		iounmap(dd->piobase);
+}
+
+/*
+ * Do a Function Level Reset (FLR) on the device.
+ * Based on static function drivers/pci/pci.c:pcie_flr().
+ */
+void hfi1_pcie_flr(struct hfi1_devdata *dd)
+{
+	int i;
+	u16 status;
+
+	/* no need to check for the capability - we know the device has it */
+
+	/* wait for Transaction Pending bit to clear, at most a few ms */
+	for (i = 0; i < 4; i++) {
+		if (i)
+			msleep((1 << (i - 1)) * 100);
+
+		pcie_capability_read_word(dd->pcidev, PCI_EXP_DEVSTA, &status);
+		if (!(status & PCI_EXP_DEVSTA_TRPND))
+			goto clear;
+	}
+
+	dd_dev_err(dd, "Transaction Pending bit is not clearing, proceeding with reset anyway\n");
+
+clear:
+	pcie_capability_set_word(dd->pcidev, PCI_EXP_DEVCTL,
+				 PCI_EXP_DEVCTL_BCR_FLR);
+	/* PCIe spec requires the function to be back within 100ms */
+	msleep(100);
+}
+
+static void msix_setup(struct hfi1_devdata *dd, int pos, u32 *msixcnt,
+		       struct hfi1_msix_entry *hfi1_msix_entry)
+{
+	int ret;
+	int nvec = *msixcnt;
+	struct msix_entry *msix_entry;
+	int i;
+
+	/*
+	 * We can't pass hfi1_msix_entry array to msix_setup
+	 * so use a dummy msix_entry array and copy the allocated
+	 * irq back to the hfi1_msix_entry array.
+	 */
+	msix_entry = kmalloc_array(nvec, sizeof(*msix_entry), GFP_KERNEL);
+	if (!msix_entry) {
+		ret = -ENOMEM;
+		goto do_intx;
+	}
+
+	for (i = 0; i < nvec; i++)
+		msix_entry[i] = hfi1_msix_entry[i].msix;
+
+	ret = pci_enable_msix_range(dd->pcidev, msix_entry, 1, nvec);
+	if (ret < 0)
+		goto free_msix_entry;
+	nvec = ret;
+
+	for (i = 0; i < nvec; i++)
+		hfi1_msix_entry[i].msix = msix_entry[i];
+
+	kfree(msix_entry);
+	*msixcnt = nvec;
+	return;
+
+free_msix_entry:
+	kfree(msix_entry);
+
+do_intx:
+	dd_dev_err(dd, "pci_enable_msix_range %d vectors failed: %d, falling back to INTx\n",
+		   nvec, ret);
+	*msixcnt = 0;
+	hfi1_enable_intx(dd->pcidev);
+}
+
+/* return the PCIe link speed from the given link status */
+static u32 extract_speed(u16 linkstat)
+{
+	u32 speed;
+
+	switch (linkstat & PCI_EXP_LNKSTA_CLS) {
+	default: /* not defined, assume Gen1 */
+	case PCI_EXP_LNKSTA_CLS_2_5GB:
+		speed = 2500; /* Gen 1, 2.5GHz */
+		break;
+	case PCI_EXP_LNKSTA_CLS_5_0GB:
+		speed = 5000; /* Gen 2, 5GHz */
+		break;
+	case GEN3_SPEED_VECTOR:
+		speed = 8000; /* Gen 3, 8GHz */
+		break;
+	}
+	return speed;
+}
+
+/* return the PCIe link speed from the given link status */
+static u32 extract_width(u16 linkstat)
+{
+	return (linkstat & PCI_EXP_LNKSTA_NLW) >> PCI_EXP_LNKSTA_NLW_SHIFT;
+}
+
+/* read the link status and set dd->{lbus_width,lbus_speed,lbus_info} */
+static void update_lbus_info(struct hfi1_devdata *dd)
+{
+	u16 linkstat;
+
+	pcie_capability_read_word(dd->pcidev, PCI_EXP_LNKSTA, &linkstat);
+	dd->lbus_width = extract_width(linkstat);
+	dd->lbus_speed = extract_speed(linkstat);
+	snprintf(dd->lbus_info, sizeof(dd->lbus_info),
+		 "PCIe,%uMHz,x%u", dd->lbus_speed, dd->lbus_width);
+}
+
+/*
+ * Read in the current PCIe link width and speed.  Find if the link is
+ * Gen3 capable.
+ */
+int pcie_speeds(struct hfi1_devdata *dd)
+{
+	u32 linkcap;
+	struct pci_dev *parent = dd->pcidev->bus->self;
+
+	if (!pci_is_pcie(dd->pcidev)) {
+		dd_dev_err(dd, "Can't find PCI Express capability!\n");
+		return -EINVAL;
+	}
+
+	/* find if our max speed is Gen3 and parent supports Gen3 speeds */
+	dd->link_gen3_capable = 1;
+
+	pcie_capability_read_dword(dd->pcidev, PCI_EXP_LNKCAP, &linkcap);
+	if ((linkcap & PCI_EXP_LNKCAP_SLS) != GEN3_SPEED_VECTOR) {
+		dd_dev_info(dd,
+			    "This HFI is not Gen3 capable, max speed 0x%x, need 0x3\n",
+			    linkcap & PCI_EXP_LNKCAP_SLS);
+		dd->link_gen3_capable = 0;
+	}
+
+	/*
+	 * bus->max_bus_speed is set from the bridge's linkcap Max Link Speed
+	 */
+	if (parent && dd->pcidev->bus->max_bus_speed != PCIE_SPEED_8_0GT) {
+		dd_dev_info(dd, "Parent PCIe bridge does not support Gen3\n");
+		dd->link_gen3_capable = 0;
+	}
+
+	/* obtain the link width and current speed */
+	update_lbus_info(dd);
+
+	dd_dev_info(dd, "%s\n", dd->lbus_info);
+
+	return 0;
+}
+
+/*
+ * Returns in *nent:
+ *	- actual number of interrupts allocated
+ *	- 0 if fell back to INTx.
+ */
+void request_msix(struct hfi1_devdata *dd, u32 *nent,
+		  struct hfi1_msix_entry *entry)
+{
+	int pos;
+
+	pos = dd->pcidev->msix_cap;
+	if (*nent && pos) {
+		msix_setup(dd, pos, nent, entry);
+		/* did it, either MSI-X or INTx */
+	} else {
+		*nent = 0;
+		hfi1_enable_intx(dd->pcidev);
+	}
+
+	tune_pcie_caps(dd);
+}
+
+void hfi1_enable_intx(struct pci_dev *pdev)
+{
+	/* first, turn on INTx */
+	pci_intx(pdev, 1);
+	/* then turn off MSI-X */
+	pci_disable_msix(pdev);
+}
+
+/* restore command and BARs after a reset has wiped them out */
+void restore_pci_variables(struct hfi1_devdata *dd)
+{
+	pci_write_config_word(dd->pcidev, PCI_COMMAND, dd->pci_command);
+	pci_write_config_dword(dd->pcidev, PCI_BASE_ADDRESS_0, dd->pcibar0);
+	pci_write_config_dword(dd->pcidev, PCI_BASE_ADDRESS_1, dd->pcibar1);
+	pci_write_config_dword(dd->pcidev, PCI_ROM_ADDRESS, dd->pci_rom);
+	pcie_capability_write_word(dd->pcidev, PCI_EXP_DEVCTL, dd->pcie_devctl);
+	pcie_capability_write_word(dd->pcidev, PCI_EXP_LNKCTL, dd->pcie_lnkctl);
+	pcie_capability_write_word(dd->pcidev, PCI_EXP_DEVCTL2,
+				   dd->pcie_devctl2);
+	pci_write_config_dword(dd->pcidev, PCI_CFG_MSIX0, dd->pci_msix0);
+	pci_write_config_dword(dd->pcidev, PCIE_CFG_SPCIE1, dd->pci_lnkctl3);
+	pci_write_config_dword(dd->pcidev, PCIE_CFG_TPH2, dd->pci_tph2);
+}
+
+/*
+ * BIOS may not set PCIe bus-utilization parameters for best performance.
+ * Check and optionally adjust them to maximize our throughput.
+ */
+static int hfi1_pcie_caps;
+module_param_named(pcie_caps, hfi1_pcie_caps, int, S_IRUGO);
+MODULE_PARM_DESC(pcie_caps, "Max PCIe tuning: Payload (0..3), ReadReq (4..7)");
+
+uint aspm_mode = ASPM_MODE_DISABLED;
+module_param_named(aspm, aspm_mode, uint, S_IRUGO);
+MODULE_PARM_DESC(aspm, "PCIe ASPM: 0: disable, 1: enable, 2: dynamic");
+
+static void tune_pcie_caps(struct hfi1_devdata *dd)
+{
+	struct pci_dev *parent;
+	u16 rc_mpss, rc_mps, ep_mpss, ep_mps;
+	u16 rc_mrrs, ep_mrrs, max_mrrs, ectl;
+
+	/*
+	 * Turn on extended tags in DevCtl in case the BIOS has turned it off
+	 * to improve WFR SDMA bandwidth
+	 */
+	pcie_capability_read_word(dd->pcidev, PCI_EXP_DEVCTL, &ectl);
+	if (!(ectl & PCI_EXP_DEVCTL_EXT_TAG)) {
+		dd_dev_info(dd, "Enabling PCIe extended tags\n");
+		ectl |= PCI_EXP_DEVCTL_EXT_TAG;
+		pcie_capability_write_word(dd->pcidev, PCI_EXP_DEVCTL, ectl);
+	}
+	/* Find out supported and configured values for parent (root) */
+	parent = dd->pcidev->bus->self;
+	/*
+	 * The driver cannot perform the tuning if it does not have
+	 * access to the upstream component.
+	 */
+	if (!parent)
+		return;
+	if (!pci_is_root_bus(parent->bus)) {
+		dd_dev_info(dd, "Parent not root\n");
+		return;
+	}
+
+	if (!pci_is_pcie(parent) || !pci_is_pcie(dd->pcidev))
+		return;
+	rc_mpss = parent->pcie_mpss;
+	rc_mps = ffs(pcie_get_mps(parent)) - 8;
+	/* Find out supported and configured values for endpoint (us) */
+	ep_mpss = dd->pcidev->pcie_mpss;
+	ep_mps = ffs(pcie_get_mps(dd->pcidev)) - 8;
+
+	/* Find max payload supported by root, endpoint */
+	if (rc_mpss > ep_mpss)
+		rc_mpss = ep_mpss;
+
+	/* If Supported greater than limit in module param, limit it */
+	if (rc_mpss > (hfi1_pcie_caps & 7))
+		rc_mpss = hfi1_pcie_caps & 7;
+	/* If less than (allowed, supported), bump root payload */
+	if (rc_mpss > rc_mps) {
+		rc_mps = rc_mpss;
+		pcie_set_mps(parent, 128 << rc_mps);
+	}
+	/* If less than (allowed, supported), bump endpoint payload */
+	if (rc_mpss > ep_mps) {
+		ep_mps = rc_mpss;
+		pcie_set_mps(dd->pcidev, 128 << ep_mps);
+	}
+
+	/*
+	 * Now the Read Request size.
+	 * No field for max supported, but PCIe spec limits it to 4096,
+	 * which is code '5' (log2(4096) - 7)
+	 */
+	max_mrrs = 5;
+	if (max_mrrs > ((hfi1_pcie_caps >> 4) & 7))
+		max_mrrs = (hfi1_pcie_caps >> 4) & 7;
+
+	max_mrrs = 128 << max_mrrs;
+	rc_mrrs = pcie_get_readrq(parent);
+	ep_mrrs = pcie_get_readrq(dd->pcidev);
+
+	if (max_mrrs > rc_mrrs) {
+		rc_mrrs = max_mrrs;
+		pcie_set_readrq(parent, rc_mrrs);
+	}
+	if (max_mrrs > ep_mrrs) {
+		ep_mrrs = max_mrrs;
+		pcie_set_readrq(dd->pcidev, ep_mrrs);
+	}
+}
+
+/* End of PCIe capability tuning */
+
+/*
+ * From here through hfi1_pci_err_handler definition is invoked via
+ * PCI error infrastructure, registered via pci
+ */
+static pci_ers_result_t
+pci_error_detected(struct pci_dev *pdev, pci_channel_state_t state)
+{
+	struct hfi1_devdata *dd = pci_get_drvdata(pdev);
+	pci_ers_result_t ret = PCI_ERS_RESULT_RECOVERED;
+
+	switch (state) {
+	case pci_channel_io_normal:
+		dd_dev_info(dd, "State Normal, ignoring\n");
+		break;
+
+	case pci_channel_io_frozen:
+		dd_dev_info(dd, "State Frozen, requesting reset\n");
+		pci_disable_device(pdev);
+		ret = PCI_ERS_RESULT_NEED_RESET;
+		break;
+
+	case pci_channel_io_perm_failure:
+		if (dd) {
+			dd_dev_info(dd, "State Permanent Failure, disabling\n");
+			/* no more register accesses! */
+			dd->flags &= ~HFI1_PRESENT;
+			hfi1_disable_after_error(dd);
+		}
+		 /* else early, or other problem */
+		ret =  PCI_ERS_RESULT_DISCONNECT;
+		break;
+
+	default: /* shouldn't happen */
+		dd_dev_info(dd, "HFI1 PCI errors detected (state %d)\n",
+			    state);
+		break;
+	}
+	return ret;
+}
+
+static pci_ers_result_t
+pci_mmio_enabled(struct pci_dev *pdev)
+{
+	u64 words = 0U;
+	struct hfi1_devdata *dd = pci_get_drvdata(pdev);
+	pci_ers_result_t ret = PCI_ERS_RESULT_RECOVERED;
+
+	if (dd && dd->pport) {
+		words = read_port_cntr(dd->pport, C_RX_WORDS, CNTR_INVALID_VL);
+		if (words == ~0ULL)
+			ret = PCI_ERS_RESULT_NEED_RESET;
+		dd_dev_info(dd,
+			    "HFI1 mmio_enabled function called, read wordscntr %Lx, returning %d\n",
+			    words, ret);
+	}
+	return  ret;
+}
+
+static pci_ers_result_t
+pci_slot_reset(struct pci_dev *pdev)
+{
+	struct hfi1_devdata *dd = pci_get_drvdata(pdev);
+
+	dd_dev_info(dd, "HFI1 slot_reset function called, ignored\n");
+	return PCI_ERS_RESULT_CAN_RECOVER;
+}
+
+static pci_ers_result_t
+pci_link_reset(struct pci_dev *pdev)
+{
+	struct hfi1_devdata *dd = pci_get_drvdata(pdev);
+
+	dd_dev_info(dd, "HFI1 link_reset function called, ignored\n");
+	return PCI_ERS_RESULT_CAN_RECOVER;
+}
+
+static void
+pci_resume(struct pci_dev *pdev)
+{
+	struct hfi1_devdata *dd = pci_get_drvdata(pdev);
+
+	dd_dev_info(dd, "HFI1 resume function called\n");
+	pci_cleanup_aer_uncorrect_error_status(pdev);
+	/*
+	 * Running jobs will fail, since it's asynchronous
+	 * unlike sysfs-requested reset.   Better than
+	 * doing nothing.
+	 */
+	hfi1_init(dd, 1); /* same as re-init after reset */
+}
+
+const struct pci_error_handlers hfi1_pci_err_handler = {
+	.error_detected = pci_error_detected,
+	.mmio_enabled = pci_mmio_enabled,
+	.link_reset = pci_link_reset,
+	.slot_reset = pci_slot_reset,
+	.resume = pci_resume,
+};
+
+/*============================================================================*/
+/* PCIe Gen3 support */
+
+/*
+ * This code is separated out because it is expected to be removed in the
+ * final shipping product.  If not, then it will be revisited and items
+ * will be moved to more standard locations.
+ */
+
+/* ASIC_PCI_SD_HOST_STATUS.FW_DNLD_STS field values */
+#define DL_STATUS_HFI0 0x1	/* hfi0 firmware download complete */
+#define DL_STATUS_HFI1 0x2	/* hfi1 firmware download complete */
+#define DL_STATUS_BOTH 0x3	/* hfi0 and hfi1 firmware download complete */
+
+/* ASIC_PCI_SD_HOST_STATUS.FW_DNLD_ERR field values */
+#define DL_ERR_NONE		0x0	/* no error */
+#define DL_ERR_SWAP_PARITY	0x1	/* parity error in SerDes interrupt */
+					/*   or response data */
+#define DL_ERR_DISABLED	0x2	/* hfi disabled */
+#define DL_ERR_SECURITY	0x3	/* security check failed */
+#define DL_ERR_SBUS		0x4	/* SBus status error */
+#define DL_ERR_XFR_PARITY	0x5	/* parity error during ROM transfer*/
+
+/* gasket block secondary bus reset delay */
+#define SBR_DELAY_US 200000	/* 200ms */
+
+/* mask for PCIe capability register lnkctl2 target link speed */
+#define LNKCTL2_TARGET_LINK_SPEED_MASK 0xf
+
+static uint pcie_target = 3;
+module_param(pcie_target, uint, S_IRUGO);
+MODULE_PARM_DESC(pcie_target, "PCIe target speed (0 skip, 1-3 Gen1-3)");
+
+static uint pcie_force;
+module_param(pcie_force, uint, S_IRUGO);
+MODULE_PARM_DESC(pcie_force, "Force driver to do a PCIe firmware download even if already at target speed");
+
+static uint pcie_retry = 5;
+module_param(pcie_retry, uint, S_IRUGO);
+MODULE_PARM_DESC(pcie_retry, "Driver will try this many times to reach requested speed");
+
+#define UNSET_PSET 255
+#define DEFAULT_DISCRETE_PSET 2	/* discrete HFI */
+#define DEFAULT_MCP_PSET 4	/* MCP HFI */
+static uint pcie_pset = UNSET_PSET;
+module_param(pcie_pset, uint, S_IRUGO);
+MODULE_PARM_DESC(pcie_pset, "PCIe Eq Pset value to use, range is 0-10");
+
+/* equalization columns */
+#define PREC 0
+#define ATTN 1
+#define POST 2
+
+/* discrete silicon preliminary equalization values */
+static const u8 discrete_preliminary_eq[11][3] = {
+	/* prec   attn   post */
+	{  0x00,  0x00,  0x12 },	/* p0 */
+	{  0x00,  0x00,  0x0c },	/* p1 */
+	{  0x00,  0x00,  0x0f },	/* p2 */
+	{  0x00,  0x00,  0x09 },	/* p3 */
+	{  0x00,  0x00,  0x00 },	/* p4 */
+	{  0x06,  0x00,  0x00 },	/* p5 */
+	{  0x09,  0x00,  0x00 },	/* p6 */
+	{  0x06,  0x00,  0x0f },	/* p7 */
+	{  0x09,  0x00,  0x09 },	/* p8 */
+	{  0x0c,  0x00,  0x00 },	/* p9 */
+	{  0x00,  0x00,  0x18 },	/* p10 */
+};
+
+/* integrated silicon preliminary equalization values */
+static const u8 integrated_preliminary_eq[11][3] = {
+	/* prec   attn   post */
+	{  0x00,  0x1e,  0x07 },	/* p0 */
+	{  0x00,  0x1e,  0x05 },	/* p1 */
+	{  0x00,  0x1e,  0x06 },	/* p2 */
+	{  0x00,  0x1e,  0x04 },	/* p3 */
+	{  0x00,  0x1e,  0x00 },	/* p4 */
+	{  0x03,  0x1e,  0x00 },	/* p5 */
+	{  0x04,  0x1e,  0x00 },	/* p6 */
+	{  0x03,  0x1e,  0x06 },	/* p7 */
+	{  0x03,  0x1e,  0x04 },	/* p8 */
+	{  0x05,  0x1e,  0x00 },	/* p9 */
+	{  0x00,  0x1e,  0x0a },	/* p10 */
+};
+
+/* helper to format the value to write to hardware */
+#define eq_value(pre, curr, post) \
+	((((u32)(pre)) << \
+			PCIE_CFG_REG_PL102_GEN3_EQ_PRE_CURSOR_PSET_SHIFT) \
+	| (((u32)(curr)) << PCIE_CFG_REG_PL102_GEN3_EQ_CURSOR_PSET_SHIFT) \
+	| (((u32)(post)) << \
+		PCIE_CFG_REG_PL102_GEN3_EQ_POST_CURSOR_PSET_SHIFT))
+
+/*
+ * Load the given EQ preset table into the PCIe hardware.
+ */
+static int load_eq_table(struct hfi1_devdata *dd, const u8 eq[11][3], u8 fs,
+			 u8 div)
+{
+	struct pci_dev *pdev = dd->pcidev;
+	u32 hit_error = 0;
+	u32 violation;
+	u32 i;
+	u8 c_minus1, c0, c_plus1;
+
+	for (i = 0; i < 11; i++) {
+		/* set index */
+		pci_write_config_dword(pdev, PCIE_CFG_REG_PL103, i);
+		/* write the value */
+		c_minus1 = eq[i][PREC] / div;
+		c0 = fs - (eq[i][PREC] / div) - (eq[i][POST] / div);
+		c_plus1 = eq[i][POST] / div;
+		pci_write_config_dword(pdev, PCIE_CFG_REG_PL102,
+				       eq_value(c_minus1, c0, c_plus1));
+		/* check if these coefficients violate EQ rules */
+		pci_read_config_dword(dd->pcidev, PCIE_CFG_REG_PL105,
+				      &violation);
+		if (violation
+		    & PCIE_CFG_REG_PL105_GEN3_EQ_VIOLATE_COEF_RULES_SMASK){
+			if (hit_error == 0) {
+				dd_dev_err(dd,
+					   "Gen3 EQ Table Coefficient rule violations\n");
+				dd_dev_err(dd, "         prec   attn   post\n");
+			}
+			dd_dev_err(dd, "   p%02d:   %02x     %02x     %02x\n",
+				   i, (u32)eq[i][0], (u32)eq[i][1],
+				   (u32)eq[i][2]);
+			dd_dev_err(dd, "            %02x     %02x     %02x\n",
+				   (u32)c_minus1, (u32)c0, (u32)c_plus1);
+			hit_error = 1;
+		}
+	}
+	if (hit_error)
+		return -EINVAL;
+	return 0;
+}
+
+/*
+ * Steps to be done after the PCIe firmware is downloaded and
+ * before the SBR for the Pcie Gen3.
+ * The SBus resource is already being held.
+ */
+static void pcie_post_steps(struct hfi1_devdata *dd)
+{
+	int i;
+
+	set_sbus_fast_mode(dd);
+	/*
+	 * Write to the PCIe PCSes to set the G3_LOCKED_NEXT bits to 1.
+	 * This avoids a spurious framing error that can otherwise be
+	 * generated by the MAC layer.
+	 *
+	 * Use individual addresses since no broadcast is set up.
+	 */
+	for (i = 0; i < NUM_PCIE_SERDES; i++) {
+		sbus_request(dd, pcie_pcs_addrs[dd->hfi1_id][i],
+			     0x03, WRITE_SBUS_RECEIVER, 0x00022132);
+	}
+
+	clear_sbus_fast_mode(dd);
+}
+
+/*
+ * Trigger a secondary bus reset (SBR) on ourselves using our parent.
+ *
+ * Based on pci_parent_bus_reset() which is not exported by the
+ * kernel core.
+ */
+static int trigger_sbr(struct hfi1_devdata *dd)
+{
+	struct pci_dev *dev = dd->pcidev;
+	struct pci_dev *pdev;
+
+	/* need a parent */
+	if (!dev->bus->self) {
+		dd_dev_err(dd, "%s: no parent device\n", __func__);
+		return -ENOTTY;
+	}
+
+	/* should not be anyone else on the bus */
+	list_for_each_entry(pdev, &dev->bus->devices, bus_list)
+		if (pdev != dev) {
+			dd_dev_err(dd,
+				   "%s: another device is on the same bus\n",
+				   __func__);
+			return -ENOTTY;
+		}
+
+	/*
+	 * A secondary bus reset (SBR) issues a hot reset to our device.
+	 * The following routine does a 1s wait after the reset is dropped
+	 * per PCI Trhfa (recovery time).  PCIe 3.0 section 6.6.1 -
+	 * Conventional Reset, paragraph 3, line 35 also says that a 1s
+	 * delay after a reset is required.  Per spec requirements,
+	 * the link is either working or not after that point.
+	 */
+	pci_reset_bridge_secondary_bus(dev->bus->self);
+
+	return 0;
+}
+
+/*
+ * Write the given gasket interrupt register.
+ */
+static void write_gasket_interrupt(struct hfi1_devdata *dd, int index,
+				   u16 code, u16 data)
+{
+	write_csr(dd, ASIC_PCIE_SD_INTRPT_LIST + (index * 8),
+		  (((u64)code << ASIC_PCIE_SD_INTRPT_LIST_INTRPT_CODE_SHIFT) |
+		   ((u64)data << ASIC_PCIE_SD_INTRPT_LIST_INTRPT_DATA_SHIFT)));
+}
+
+/*
+ * Tell the gasket logic how to react to the reset.
+ */
+static void arm_gasket_logic(struct hfi1_devdata *dd)
+{
+	u64 reg;
+
+	reg = (((u64)1 << dd->hfi1_id) <<
+	       ASIC_PCIE_SD_HOST_CMD_INTRPT_CMD_SHIFT) |
+	      ((u64)pcie_serdes_broadcast[dd->hfi1_id] <<
+	       ASIC_PCIE_SD_HOST_CMD_SBUS_RCVR_ADDR_SHIFT |
+	       ASIC_PCIE_SD_HOST_CMD_SBR_MODE_SMASK |
+	       ((u64)SBR_DELAY_US & ASIC_PCIE_SD_HOST_CMD_TIMER_MASK) <<
+	       ASIC_PCIE_SD_HOST_CMD_TIMER_SHIFT);
+	write_csr(dd, ASIC_PCIE_SD_HOST_CMD, reg);
+	/* read back to push the write */
+	read_csr(dd, ASIC_PCIE_SD_HOST_CMD);
+}
+
+/*
+ * CCE_PCIE_CTRL long name helpers
+ * We redefine these shorter macros to use in the code while leaving
+ * chip_registers.h to be autogenerated from the hardware spec.
+ */
+#define LANE_BUNDLE_MASK              CCE_PCIE_CTRL_PCIE_LANE_BUNDLE_MASK
+#define LANE_BUNDLE_SHIFT             CCE_PCIE_CTRL_PCIE_LANE_BUNDLE_SHIFT
+#define LANE_DELAY_MASK               CCE_PCIE_CTRL_PCIE_LANE_DELAY_MASK
+#define LANE_DELAY_SHIFT              CCE_PCIE_CTRL_PCIE_LANE_DELAY_SHIFT
+#define MARGIN_OVERWRITE_ENABLE_SHIFT CCE_PCIE_CTRL_XMT_MARGIN_OVERWRITE_ENABLE_SHIFT
+#define MARGIN_SHIFT                  CCE_PCIE_CTRL_XMT_MARGIN_SHIFT
+#define MARGIN_G1_G2_OVERWRITE_MASK   CCE_PCIE_CTRL_XMT_MARGIN_GEN1_GEN2_OVERWRITE_ENABLE_MASK
+#define MARGIN_G1_G2_OVERWRITE_SHIFT  CCE_PCIE_CTRL_XMT_MARGIN_GEN1_GEN2_OVERWRITE_ENABLE_SHIFT
+#define MARGIN_GEN1_GEN2_MASK         CCE_PCIE_CTRL_XMT_MARGIN_GEN1_GEN2_MASK
+#define MARGIN_GEN1_GEN2_SHIFT        CCE_PCIE_CTRL_XMT_MARGIN_GEN1_GEN2_SHIFT
+
+ /*
+  * Write xmt_margin for full-swing (WFR-B) or half-swing (WFR-C).
+  */
+static void write_xmt_margin(struct hfi1_devdata *dd, const char *fname)
+{
+	u64 pcie_ctrl;
+	u64 xmt_margin;
+	u64 xmt_margin_oe;
+	u64 lane_delay;
+	u64 lane_bundle;
+
+	pcie_ctrl = read_csr(dd, CCE_PCIE_CTRL);
+
+	/*
+	 * For Discrete, use full-swing.
+	 *  - PCIe TX defaults to full-swing.
+	 *    Leave this register as default.
+	 * For Integrated, use half-swing
+	 *  - Copy xmt_margin and xmt_margin_oe
+	 *    from Gen1/Gen2 to Gen3.
+	 */
+	if (dd->pcidev->device == PCI_DEVICE_ID_INTEL1) { /* integrated */
+		/* extract initial fields */
+		xmt_margin = (pcie_ctrl >> MARGIN_GEN1_GEN2_SHIFT)
+			      & MARGIN_GEN1_GEN2_MASK;
+		xmt_margin_oe = (pcie_ctrl >> MARGIN_G1_G2_OVERWRITE_SHIFT)
+				 & MARGIN_G1_G2_OVERWRITE_MASK;
+		lane_delay = (pcie_ctrl >> LANE_DELAY_SHIFT) & LANE_DELAY_MASK;
+		lane_bundle = (pcie_ctrl >> LANE_BUNDLE_SHIFT)
+			       & LANE_BUNDLE_MASK;
+
+		/*
+		 * For A0, EFUSE values are not set.  Override with the
+		 * correct values.
+		 */
+		if (is_ax(dd)) {
+			/*
+			 * xmt_margin and OverwiteEnabel should be the
+			 * same for Gen1/Gen2 and Gen3
+			 */
+			xmt_margin = 0x5;
+			xmt_margin_oe = 0x1;
+			lane_delay = 0xF; /* Delay 240ns. */
+			lane_bundle = 0x0; /* Set to 1 lane. */
+		}
+
+		/* overwrite existing values */
+		pcie_ctrl = (xmt_margin << MARGIN_GEN1_GEN2_SHIFT)
+			| (xmt_margin_oe << MARGIN_G1_G2_OVERWRITE_SHIFT)
+			| (xmt_margin << MARGIN_SHIFT)
+			| (xmt_margin_oe << MARGIN_OVERWRITE_ENABLE_SHIFT)
+			| (lane_delay << LANE_DELAY_SHIFT)
+			| (lane_bundle << LANE_BUNDLE_SHIFT);
+
+		write_csr(dd, CCE_PCIE_CTRL, pcie_ctrl);
+	}
+
+	dd_dev_dbg(dd, "%s: program XMT margin, CcePcieCtrl 0x%llx\n",
+		   fname, pcie_ctrl);
+}
+
+/*
+ * Do all the steps needed to transition the PCIe link to Gen3 speed.
+ */
+int do_pcie_gen3_transition(struct hfi1_devdata *dd)
+{
+	struct pci_dev *parent = dd->pcidev->bus->self;
+	u64 fw_ctrl;
+	u64 reg, therm;
+	u32 reg32, fs, lf;
+	u32 status, err;
+	int ret;
+	int do_retry, retry_count = 0;
+	uint default_pset;
+	u16 target_vector, target_speed;
+	u16 lnkctl2, vendor;
+	u8 div;
+	const u8 (*eq)[3];
+	int return_error = 0;
+
+	/* PCIe Gen3 is for the ASIC only */
+	if (dd->icode != ICODE_RTL_SILICON)
+		return 0;
+
+	if (pcie_target == 1) {			/* target Gen1 */
+		target_vector = GEN1_SPEED_VECTOR;
+		target_speed = 2500;
+	} else if (pcie_target == 2) {		/* target Gen2 */
+		target_vector = GEN2_SPEED_VECTOR;
+		target_speed = 5000;
+	} else if (pcie_target == 3) {		/* target Gen3 */
+		target_vector = GEN3_SPEED_VECTOR;
+		target_speed = 8000;
+	} else {
+		/* off or invalid target - skip */
+		dd_dev_info(dd, "%s: Skipping PCIe transition\n", __func__);
+		return 0;
+	}
+
+	/* if already at target speed, done (unless forced) */
+	if (dd->lbus_speed == target_speed) {
+		dd_dev_info(dd, "%s: PCIe already at gen%d, %s\n", __func__,
+			    pcie_target,
+			    pcie_force ? "re-doing anyway" : "skipping");
+		if (!pcie_force)
+			return 0;
+	}
+
+	/*
+	 * The driver cannot do the transition if it has no access to the
+	 * upstream component
+	 */
+	if (!parent) {
+		dd_dev_info(dd, "%s: No upstream, Can't do gen3 transition\n",
+			    __func__);
+		return 0;
+	}
+
+	/*
+	 * Do the Gen3 transition.  Steps are those of the PCIe Gen3
+	 * recipe.
+	 */
+
+	/* step 1: pcie link working in gen1/gen2 */
+
+	/* step 2: if either side is not capable of Gen3, done */
+	if (pcie_target == 3 && !dd->link_gen3_capable) {
+		dd_dev_err(dd, "The PCIe link is not Gen3 capable\n");
+		ret = -ENOSYS;
+		goto done_no_mutex;
+	}
+
+	/* hold the SBus resource across the firmware download and SBR */
+	ret = acquire_chip_resource(dd, CR_SBUS, SBUS_TIMEOUT);
+	if (ret) {
+		dd_dev_err(dd, "%s: unable to acquire SBus resource\n",
+			   __func__);
+		return ret;
+	}
+
+	/* make sure thermal polling is not causing interrupts */
+	therm = read_csr(dd, ASIC_CFG_THERM_POLL_EN);
+	if (therm) {
+		write_csr(dd, ASIC_CFG_THERM_POLL_EN, 0x0);
+		msleep(100);
+		dd_dev_info(dd, "%s: Disabled therm polling\n",
+			    __func__);
+	}
+
+retry:
+	/* the SBus download will reset the spico for thermal */
+
+	/* step 3: download SBus Master firmware */
+	/* step 4: download PCIe Gen3 SerDes firmware */
+	dd_dev_info(dd, "%s: downloading firmware\n", __func__);
+	ret = load_pcie_firmware(dd);
+	if (ret) {
+		/* do not proceed if the firmware cannot be downloaded */
+		return_error = 1;
+		goto done;
+	}
+
+	/* step 5: set up device parameter settings */
+	dd_dev_info(dd, "%s: setting PCIe registers\n", __func__);
+
+	/*
+	 * PcieCfgSpcie1 - Link Control 3
+	 * Leave at reset value.  No need to set PerfEq - link equalization
+	 * will be performed automatically after the SBR when the target
+	 * speed is 8GT/s.
+	 */
+
+	/* clear all 16 per-lane error bits (PCIe: Lane Error Status) */
+	pci_write_config_dword(dd->pcidev, PCIE_CFG_SPCIE2, 0xffff);
+
+	/* step 5a: Set Synopsys Port Logic registers */
+
+	/*
+	 * PcieCfgRegPl2 - Port Force Link
+	 *
+	 * Set the low power field to 0x10 to avoid unnecessary power
+	 * management messages.  All other fields are zero.
+	 */
+	reg32 = 0x10ul << PCIE_CFG_REG_PL2_LOW_PWR_ENT_CNT_SHIFT;
+	pci_write_config_dword(dd->pcidev, PCIE_CFG_REG_PL2, reg32);
+
+	/*
+	 * PcieCfgRegPl100 - Gen3 Control
+	 *
+	 * turn off PcieCfgRegPl100.Gen3ZRxDcNonCompl
+	 * turn on PcieCfgRegPl100.EqEieosCnt
+	 * Everything else zero.
+	 */
+	reg32 = PCIE_CFG_REG_PL100_EQ_EIEOS_CNT_SMASK;
+	pci_write_config_dword(dd->pcidev, PCIE_CFG_REG_PL100, reg32);
+
+	/*
+	 * PcieCfgRegPl101 - Gen3 EQ FS and LF
+	 * PcieCfgRegPl102 - Gen3 EQ Presets to Coefficients Mapping
+	 * PcieCfgRegPl103 - Gen3 EQ Preset Index
+	 * PcieCfgRegPl105 - Gen3 EQ Status
+	 *
+	 * Give initial EQ settings.
+	 */
+	if (dd->pcidev->device == PCI_DEVICE_ID_INTEL0) { /* discrete */
+		/* 1000mV, FS=24, LF = 8 */
+		fs = 24;
+		lf = 8;
+		div = 3;
+		eq = discrete_preliminary_eq;
+		default_pset = DEFAULT_DISCRETE_PSET;
+	} else {
+		/* 400mV, FS=29, LF = 9 */
+		fs = 29;
+		lf = 9;
+		div = 1;
+		eq = integrated_preliminary_eq;
+		default_pset = DEFAULT_MCP_PSET;
+	}
+	pci_write_config_dword(dd->pcidev, PCIE_CFG_REG_PL101,
+			       (fs <<
+				PCIE_CFG_REG_PL101_GEN3_EQ_LOCAL_FS_SHIFT) |
+			       (lf <<
+				PCIE_CFG_REG_PL101_GEN3_EQ_LOCAL_LF_SHIFT));
+	ret = load_eq_table(dd, eq, fs, div);
+	if (ret)
+		goto done;
+
+	/*
+	 * PcieCfgRegPl106 - Gen3 EQ Control
+	 *
+	 * Set Gen3EqPsetReqVec, leave other fields 0.
+	 */
+	if (pcie_pset == UNSET_PSET)
+		pcie_pset = default_pset;
+	if (pcie_pset > 10) {	/* valid range is 0-10, inclusive */
+		dd_dev_err(dd, "%s: Invalid Eq Pset %u, setting to %d\n",
+			   __func__, pcie_pset, default_pset);
+		pcie_pset = default_pset;
+	}
+	dd_dev_info(dd, "%s: using EQ Pset %u\n", __func__, pcie_pset);
+	pci_write_config_dword(dd->pcidev, PCIE_CFG_REG_PL106,
+			       ((1 << pcie_pset) <<
+			PCIE_CFG_REG_PL106_GEN3_EQ_PSET_REQ_VEC_SHIFT) |
+			PCIE_CFG_REG_PL106_GEN3_EQ_EVAL2MS_DISABLE_SMASK |
+			PCIE_CFG_REG_PL106_GEN3_EQ_PHASE23_EXIT_MODE_SMASK);
+
+	/*
+	 * step 5b: Do post firmware download steps via SBus
+	 */
+	dd_dev_info(dd, "%s: doing pcie post steps\n", __func__);
+	pcie_post_steps(dd);
+
+	/*
+	 * step 5c: Program gasket interrupts
+	 */
+	/* set the Rx Bit Rate to REFCLK ratio */
+	write_gasket_interrupt(dd, 0, 0x0006, 0x0050);
+	/* disable pCal for PCIe Gen3 RX equalization */
+	write_gasket_interrupt(dd, 1, 0x0026, 0x5b01);
+	/*
+	 * Enable iCal for PCIe Gen3 RX equalization, and set which
+	 * evaluation of RX_EQ_EVAL will launch the iCal procedure.
+	 */
+	write_gasket_interrupt(dd, 2, 0x0026, 0x5202);
+	/* terminate list */
+	write_gasket_interrupt(dd, 3, 0x0000, 0x0000);
+
+	/*
+	 * step 5d: program XMT margin
+	 */
+	write_xmt_margin(dd, __func__);
+
+	/*
+	 * step 5e: disable active state power management (ASPM). It
+	 * will be enabled if required later
+	 */
+	dd_dev_info(dd, "%s: clearing ASPM\n", __func__);
+	aspm_hw_disable_l1(dd);
+
+	/*
+	 * step 5f: clear DirectSpeedChange
+	 * PcieCfgRegPl67.DirectSpeedChange must be zero to prevent the
+	 * change in the speed target from starting before we are ready.
+	 * This field defaults to 0 and we are not changing it, so nothing
+	 * needs to be done.
+	 */
+
+	/* step 5g: Set target link speed */
+	/*
+	 * Set target link speed to be target on both device and parent.
+	 * On setting the parent: Some system BIOSs "helpfully" set the
+	 * parent target speed to Gen2 to match the ASIC's initial speed.
+	 * We can set the target Gen3 because we have already checked
+	 * that it is Gen3 capable earlier.
+	 */
+	dd_dev_info(dd, "%s: setting parent target link speed\n", __func__);
+	pcie_capability_read_word(parent, PCI_EXP_LNKCTL2, &lnkctl2);
+	dd_dev_info(dd, "%s: ..old link control2: 0x%x\n", __func__,
+		    (u32)lnkctl2);
+	/* only write to parent if target is not as high as ours */
+	if ((lnkctl2 & LNKCTL2_TARGET_LINK_SPEED_MASK) < target_vector) {
+		lnkctl2 &= ~LNKCTL2_TARGET_LINK_SPEED_MASK;
+		lnkctl2 |= target_vector;
+		dd_dev_info(dd, "%s: ..new link control2: 0x%x\n", __func__,
+			    (u32)lnkctl2);
+		pcie_capability_write_word(parent, PCI_EXP_LNKCTL2, lnkctl2);
+	} else {
+		dd_dev_info(dd, "%s: ..target speed is OK\n", __func__);
+	}
+
+	dd_dev_info(dd, "%s: setting target link speed\n", __func__);
+	pcie_capability_read_word(dd->pcidev, PCI_EXP_LNKCTL2, &lnkctl2);
+	dd_dev_info(dd, "%s: ..old link control2: 0x%x\n", __func__,
+		    (u32)lnkctl2);
+	lnkctl2 &= ~LNKCTL2_TARGET_LINK_SPEED_MASK;
+	lnkctl2 |= target_vector;
+	dd_dev_info(dd, "%s: ..new link control2: 0x%x\n", __func__,
+		    (u32)lnkctl2);
+	pcie_capability_write_word(dd->pcidev, PCI_EXP_LNKCTL2, lnkctl2);
+
+	/* step 5h: arm gasket logic */
+	/* hold DC in reset across the SBR */
+	write_csr(dd, CCE_DC_CTRL, CCE_DC_CTRL_DC_RESET_SMASK);
+	(void)read_csr(dd, CCE_DC_CTRL); /* DC reset hold */
+	/* save firmware control across the SBR */
+	fw_ctrl = read_csr(dd, MISC_CFG_FW_CTRL);
+
+	dd_dev_info(dd, "%s: arming gasket logic\n", __func__);
+	arm_gasket_logic(dd);
+
+	/*
+	 * step 6: quiesce PCIe link
+	 * The chip has already been reset, so there will be no traffic
+	 * from the chip.  Linux has no easy way to enforce that it will
+	 * not try to access the device, so we just need to hope it doesn't
+	 * do it while we are doing the reset.
+	 */
+
+	/*
+	 * step 7: initiate the secondary bus reset (SBR)
+	 * step 8: hardware brings the links back up
+	 * step 9: wait for link speed transition to be complete
+	 */
+	dd_dev_info(dd, "%s: calling trigger_sbr\n", __func__);
+	ret = trigger_sbr(dd);
+	if (ret)
+		goto done;
+
+	/* step 10: decide what to do next */
+
+	/* check if we can read PCI space */
+	ret = pci_read_config_word(dd->pcidev, PCI_VENDOR_ID, &vendor);
+	if (ret) {
+		dd_dev_info(dd,
+			    "%s: read of VendorID failed after SBR, err %d\n",
+			    __func__, ret);
+		return_error = 1;
+		goto done;
+	}
+	if (vendor == 0xffff) {
+		dd_dev_info(dd, "%s: VendorID is all 1s after SBR\n", __func__);
+		return_error = 1;
+		ret = -EIO;
+		goto done;
+	}
+
+	/* restore PCI space registers we know were reset */
+	dd_dev_info(dd, "%s: calling restore_pci_variables\n", __func__);
+	restore_pci_variables(dd);
+	/* restore firmware control */
+	write_csr(dd, MISC_CFG_FW_CTRL, fw_ctrl);
+
+	/*
+	 * Check the gasket block status.
+	 *
+	 * This is the first CSR read after the SBR.  If the read returns
+	 * all 1s (fails), the link did not make it back.
+	 *
+	 * Once we're sure we can read and write, clear the DC reset after
+	 * the SBR.  Then check for any per-lane errors. Then look over
+	 * the status.
+	 */
+	reg = read_csr(dd, ASIC_PCIE_SD_HOST_STATUS);
+	dd_dev_info(dd, "%s: gasket block status: 0x%llx\n", __func__, reg);
+	if (reg == ~0ull) {	/* PCIe read failed/timeout */
+		dd_dev_err(dd, "SBR failed - unable to read from device\n");
+		return_error = 1;
+		ret = -ENOSYS;
+		goto done;
+	}
+
+	/* clear the DC reset */
+	write_csr(dd, CCE_DC_CTRL, 0);
+
+	/* Set the LED off */
+	setextled(dd, 0);
+
+	/* check for any per-lane errors */
+	pci_read_config_dword(dd->pcidev, PCIE_CFG_SPCIE2, &reg32);
+	dd_dev_info(dd, "%s: per-lane errors: 0x%x\n", __func__, reg32);
+
+	/* extract status, look for our HFI */
+	status = (reg >> ASIC_PCIE_SD_HOST_STATUS_FW_DNLD_STS_SHIFT)
+			& ASIC_PCIE_SD_HOST_STATUS_FW_DNLD_STS_MASK;
+	if ((status & (1 << dd->hfi1_id)) == 0) {
+		dd_dev_err(dd,
+			   "%s: gasket status 0x%x, expecting 0x%x\n",
+			   __func__, status, 1 << dd->hfi1_id);
+		ret = -EIO;
+		goto done;
+	}
+
+	/* extract error */
+	err = (reg >> ASIC_PCIE_SD_HOST_STATUS_FW_DNLD_ERR_SHIFT)
+		& ASIC_PCIE_SD_HOST_STATUS_FW_DNLD_ERR_MASK;
+	if (err) {
+		dd_dev_err(dd, "%s: gasket error %d\n", __func__, err);
+		ret = -EIO;
+		goto done;
+	}
+
+	/* update our link information cache */
+	update_lbus_info(dd);
+	dd_dev_info(dd, "%s: new speed and width: %s\n", __func__,
+		    dd->lbus_info);
+
+	if (dd->lbus_speed != target_speed) { /* not target */
+		/* maybe retry */
+		do_retry = retry_count < pcie_retry;
+		dd_dev_err(dd, "PCIe link speed did not switch to Gen%d%s\n",
+			   pcie_target, do_retry ? ", retrying" : "");
+		retry_count++;
+		if (do_retry) {
+			msleep(100); /* allow time to settle */
+			goto retry;
+		}
+		ret = -EIO;
+	}
+
+done:
+	if (therm) {
+		write_csr(dd, ASIC_CFG_THERM_POLL_EN, 0x1);
+		msleep(100);
+		dd_dev_info(dd, "%s: Re-enable therm polling\n",
+			    __func__);
+	}
+	release_chip_resource(dd, CR_SBUS);
+done_no_mutex:
+	/* return no error if it is OK to be at current speed */
+	if (ret && !return_error) {
+		dd_dev_err(dd, "Proceeding at current speed PCIe speed\n");
+		ret = 0;
+	}
+
+	dd_dev_info(dd, "%s: done\n", __func__);
+	return ret;
+}