csio_init.c 28.7 KB
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/*
 * This file is part of the Chelsio FCoE driver for Linux.
 *
 * Copyright (c) 2008-2012 Chelsio Communications, 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.
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/aer.h>
#include <linux/mm.h>
#include <linux/notifier.h>
#include <linux/kdebug.h>
#include <linux/seq_file.h>
#include <linux/debugfs.h>
#include <linux/string.h>
#include <linux/export.h>

#include "csio_init.h"
#include "csio_defs.h"

#define CSIO_MIN_MEMPOOL_SZ	64

static struct dentry *csio_debugfs_root;

static struct scsi_transport_template *csio_fcoe_transport;
static struct scsi_transport_template *csio_fcoe_transport_vport;

/*
 * debugfs support
 */
static ssize_t
csio_mem_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
{
	loff_t pos = *ppos;
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	loff_t avail = file_inode(file)->i_size;
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	unsigned int mem = (uintptr_t)file->private_data & 3;
	struct csio_hw *hw = file->private_data - mem;

	if (pos < 0)
		return -EINVAL;
	if (pos >= avail)
		return 0;
	if (count > avail - pos)
		count = avail - pos;

	while (count) {
		size_t len;
		int ret, ofst;
		__be32 data[16];

		if (mem == MEM_MC)
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			ret = hw->chip_ops->chip_mc_read(hw, 0, pos,
							 data, NULL);
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		else
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			ret = hw->chip_ops->chip_edc_read(hw, mem, pos,
							  data, NULL);
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		if (ret)
			return ret;

		ofst = pos % sizeof(data);
		len = min(count, sizeof(data) - ofst);
		if (copy_to_user(buf, (u8 *)data + ofst, len))
			return -EFAULT;

		buf += len;
		pos += len;
		count -= len;
	}
	count = pos - *ppos;
	*ppos = pos;
	return count;
}

static const struct file_operations csio_mem_debugfs_fops = {
	.owner   = THIS_MODULE,
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	.open    = simple_open,
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	.read    = csio_mem_read,
	.llseek  = default_llseek,
};

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void csio_add_debugfs_mem(struct csio_hw *hw, const char *name,
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				 unsigned int idx, unsigned int size_mb)
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{
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	debugfs_create_file_size(name, S_IRUSR, hw->debugfs_root,
				 (void *)hw + idx, &csio_mem_debugfs_fops,
				 size_mb << 20);
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}

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static int csio_setup_debugfs(struct csio_hw *hw)
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{
	int i;

	if (IS_ERR_OR_NULL(hw->debugfs_root))
		return -1;

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	i = csio_rd_reg32(hw, MA_TARGET_MEM_ENABLE_A);
	if (i & EDRAM0_ENABLE_F)
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		csio_add_debugfs_mem(hw, "edc0", MEM_EDC0, 5);
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	if (i & EDRAM1_ENABLE_F)
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		csio_add_debugfs_mem(hw, "edc1", MEM_EDC1, 5);
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	hw->chip_ops->chip_dfs_create_ext_mem(hw);
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	return 0;
}

/*
 * csio_dfs_create - Creates and sets up per-hw debugfs.
 *
 */
static int
csio_dfs_create(struct csio_hw *hw)
{
	if (csio_debugfs_root) {
		hw->debugfs_root = debugfs_create_dir(pci_name(hw->pdev),
							csio_debugfs_root);
		csio_setup_debugfs(hw);
	}

	return 0;
}

/*
 * csio_dfs_destroy - Destroys per-hw debugfs.
 */
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static void
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csio_dfs_destroy(struct csio_hw *hw)
{
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	debugfs_remove_recursive(hw->debugfs_root);
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}

/*
 * csio_dfs_init - Debug filesystem initialization for the module.
 *
 */
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static void
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csio_dfs_init(void)
{
	csio_debugfs_root = debugfs_create_dir(KBUILD_MODNAME, NULL);
}

/*
 * csio_dfs_exit - debugfs cleanup for the module.
 */
static void
csio_dfs_exit(void)
{
	debugfs_remove(csio_debugfs_root);
}

/*
 * csio_pci_init - PCI initialization.
 * @pdev: PCI device.
 * @bars: Bitmask of bars to be requested.
 *
 * Initializes the PCI function by enabling MMIO, setting bus
 * mastership and setting DMA mask.
 */
static int
csio_pci_init(struct pci_dev *pdev, int *bars)
{
	int rv = -ENODEV;

	*bars = pci_select_bars(pdev, IORESOURCE_MEM);

	if (pci_enable_device_mem(pdev))
		goto err;

	if (pci_request_selected_regions(pdev, *bars, KBUILD_MODNAME))
		goto err_disable_device;

	pci_set_master(pdev);
	pci_try_set_mwi(pdev);

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	rv = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
	if (rv)
		rv = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
	if (rv) {
		rv = -ENODEV;
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		dev_err(&pdev->dev, "No suitable DMA available.\n");
		goto err_release_regions;
	}

	return 0;

err_release_regions:
	pci_release_selected_regions(pdev, *bars);
err_disable_device:
	pci_disable_device(pdev);
err:
	return rv;

}

/*
 * csio_pci_exit - PCI unitialization.
 * @pdev: PCI device.
 * @bars: Bars to be released.
 *
 */
static void
csio_pci_exit(struct pci_dev *pdev, int *bars)
{
	pci_release_selected_regions(pdev, *bars);
	pci_disable_device(pdev);
}

/*
 * csio_hw_init_workers - Initialize the HW module's worker threads.
 * @hw: HW module.
 *
 */
static void
csio_hw_init_workers(struct csio_hw *hw)
{
	INIT_WORK(&hw->evtq_work, csio_evtq_worker);
}

static void
csio_hw_exit_workers(struct csio_hw *hw)
{
	cancel_work_sync(&hw->evtq_work);
}

static int
csio_create_queues(struct csio_hw *hw)
{
	int i, j;
	struct csio_mgmtm *mgmtm = csio_hw_to_mgmtm(hw);
	int rv;
	struct csio_scsi_cpu_info *info;

	if (hw->flags & CSIO_HWF_Q_FW_ALLOCED)
		return 0;

	if (hw->intr_mode != CSIO_IM_MSIX) {
		rv = csio_wr_iq_create(hw, NULL, hw->intr_iq_idx,
					0, hw->pport[0].portid, false, NULL);
		if (rv != 0) {
			csio_err(hw, " Forward Interrupt IQ failed!: %d\n", rv);
			return rv;
		}
	}

	/* FW event queue */
	rv = csio_wr_iq_create(hw, NULL, hw->fwevt_iq_idx,
			       csio_get_fwevt_intr_idx(hw),
			       hw->pport[0].portid, true, NULL);
	if (rv != 0) {
		csio_err(hw, "FW event IQ config failed!: %d\n", rv);
		return rv;
	}

	/* Create mgmt queue */
	rv = csio_wr_eq_create(hw, NULL, mgmtm->eq_idx,
			mgmtm->iq_idx, hw->pport[0].portid, NULL);

	if (rv != 0) {
		csio_err(hw, "Mgmt EQ create failed!: %d\n", rv);
		goto err;
	}

	/* Create SCSI queues */
	for (i = 0; i < hw->num_pports; i++) {
		info = &hw->scsi_cpu_info[i];

		for (j = 0; j < info->max_cpus; j++) {
			struct csio_scsi_qset *sqset = &hw->sqset[i][j];

			rv = csio_wr_iq_create(hw, NULL, sqset->iq_idx,
					       sqset->intr_idx, i, false, NULL);
			if (rv != 0) {
				csio_err(hw,
				   "SCSI module IQ config failed [%d][%d]:%d\n",
				   i, j, rv);
				goto err;
			}
			rv = csio_wr_eq_create(hw, NULL, sqset->eq_idx,
					       sqset->iq_idx, i, NULL);
			if (rv != 0) {
				csio_err(hw,
				   "SCSI module EQ config failed [%d][%d]:%d\n",
				   i, j, rv);
				goto err;
			}
		} /* for all CPUs */
	} /* For all ports */

	hw->flags |= CSIO_HWF_Q_FW_ALLOCED;
	return 0;
err:
	csio_wr_destroy_queues(hw, true);
	return -EINVAL;
}

/*
 * csio_config_queues - Configure the DMA queues.
 * @hw: HW module.
 *
 * Allocates memory for queues are registers them with FW.
 */
int
csio_config_queues(struct csio_hw *hw)
{
	int i, j, idx, k = 0;
	int rv;
	struct csio_scsi_qset *sqset;
	struct csio_mgmtm *mgmtm = csio_hw_to_mgmtm(hw);
	struct csio_scsi_qset *orig;
	struct csio_scsi_cpu_info *info;

	if (hw->flags & CSIO_HWF_Q_MEM_ALLOCED)
		return csio_create_queues(hw);

	/* Calculate number of SCSI queues for MSIX we would like */
	hw->num_scsi_msix_cpus = num_online_cpus();
	hw->num_sqsets = num_online_cpus() * hw->num_pports;

	if (hw->num_sqsets > CSIO_MAX_SCSI_QSETS) {
		hw->num_sqsets = CSIO_MAX_SCSI_QSETS;
		hw->num_scsi_msix_cpus = CSIO_MAX_SCSI_CPU;
	}

	/* Initialize max_cpus, may get reduced during msix allocations */
	for (i = 0; i < hw->num_pports; i++)
		hw->scsi_cpu_info[i].max_cpus = hw->num_scsi_msix_cpus;

	csio_dbg(hw, "nsqsets:%d scpus:%d\n",
		    hw->num_sqsets, hw->num_scsi_msix_cpus);

	csio_intr_enable(hw);

	if (hw->intr_mode != CSIO_IM_MSIX) {

		/* Allocate Forward interrupt iq. */
		hw->intr_iq_idx = csio_wr_alloc_q(hw, CSIO_INTR_IQSIZE,
						CSIO_INTR_WRSIZE, CSIO_INGRESS,
						(void *)hw, 0, 0, NULL);
		if (hw->intr_iq_idx == -1) {
			csio_err(hw,
				 "Forward interrupt queue creation failed\n");
			goto intr_disable;
		}
	}

	/* Allocate the FW evt queue */
	hw->fwevt_iq_idx = csio_wr_alloc_q(hw, CSIO_FWEVT_IQSIZE,
					   CSIO_FWEVT_WRSIZE,
					   CSIO_INGRESS, (void *)hw,
					   CSIO_FWEVT_FLBUFS, 0,
					   csio_fwevt_intx_handler);
	if (hw->fwevt_iq_idx == -1) {
		csio_err(hw, "FW evt queue creation failed\n");
		goto intr_disable;
	}

	/* Allocate the mgmt queue */
	mgmtm->eq_idx = csio_wr_alloc_q(hw, CSIO_MGMT_EQSIZE,
				      CSIO_MGMT_EQ_WRSIZE,
				      CSIO_EGRESS, (void *)hw, 0, 0, NULL);
	if (mgmtm->eq_idx == -1) {
		csio_err(hw, "Failed to alloc egress queue for mgmt module\n");
		goto intr_disable;
	}

	/* Use FW IQ for MGMT req completion */
	mgmtm->iq_idx = hw->fwevt_iq_idx;

	/* Allocate SCSI queues */
	for (i = 0; i < hw->num_pports; i++) {
		info = &hw->scsi_cpu_info[i];

		for (j = 0; j < hw->num_scsi_msix_cpus; j++) {
			sqset = &hw->sqset[i][j];

			if (j >= info->max_cpus) {
				k = j % info->max_cpus;
				orig = &hw->sqset[i][k];
				sqset->eq_idx = orig->eq_idx;
				sqset->iq_idx = orig->iq_idx;
				continue;
			}

			idx = csio_wr_alloc_q(hw, csio_scsi_eqsize, 0,
					      CSIO_EGRESS, (void *)hw, 0, 0,
					      NULL);
			if (idx == -1) {
				csio_err(hw, "EQ creation failed for idx:%d\n",
					    idx);
				goto intr_disable;
			}

			sqset->eq_idx = idx;

			idx = csio_wr_alloc_q(hw, CSIO_SCSI_IQSIZE,
					     CSIO_SCSI_IQ_WRSZ, CSIO_INGRESS,
					     (void *)hw, 0, 0,
					     csio_scsi_intx_handler);
			if (idx == -1) {
				csio_err(hw, "IQ creation failed for idx:%d\n",
					    idx);
				goto intr_disable;
			}
			sqset->iq_idx = idx;
		} /* for all CPUs */
	} /* For all ports */

	hw->flags |= CSIO_HWF_Q_MEM_ALLOCED;

	rv = csio_create_queues(hw);
	if (rv != 0)
		goto intr_disable;

	/*
	 * Now request IRQs for the vectors. In the event of a failure,
	 * cleanup is handled internally by this function.
	 */
	rv = csio_request_irqs(hw);
	if (rv != 0)
		return -EINVAL;

	return 0;

intr_disable:
	csio_intr_disable(hw, false);

	return -EINVAL;
}

static int
csio_resource_alloc(struct csio_hw *hw)
{
	struct csio_wrm *wrm = csio_hw_to_wrm(hw);
	int rv = -ENOMEM;

	wrm->num_q = ((CSIO_MAX_SCSI_QSETS * 2) + CSIO_HW_NIQ +
		       CSIO_HW_NEQ + CSIO_HW_NFLQ + CSIO_HW_NINTXQ);

	hw->mb_mempool = mempool_create_kmalloc_pool(CSIO_MIN_MEMPOOL_SZ,
						  sizeof(struct csio_mb));
	if (!hw->mb_mempool)
		goto err;

	hw->rnode_mempool = mempool_create_kmalloc_pool(CSIO_MIN_MEMPOOL_SZ,
						     sizeof(struct csio_rnode));
	if (!hw->rnode_mempool)
		goto err_free_mb_mempool;

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	hw->scsi_dma_pool = dma_pool_create("csio_scsi_dma_pool",
					    &hw->pdev->dev, CSIO_SCSI_RSP_LEN,
					    8, 0);
	if (!hw->scsi_dma_pool)
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		goto err_free_rn_pool;

	return 0;

err_free_rn_pool:
	mempool_destroy(hw->rnode_mempool);
	hw->rnode_mempool = NULL;
err_free_mb_mempool:
	mempool_destroy(hw->mb_mempool);
	hw->mb_mempool = NULL;
err:
	return rv;
}

static void
csio_resource_free(struct csio_hw *hw)
{
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	dma_pool_destroy(hw->scsi_dma_pool);
	hw->scsi_dma_pool = NULL;
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	mempool_destroy(hw->rnode_mempool);
	hw->rnode_mempool = NULL;
	mempool_destroy(hw->mb_mempool);
	hw->mb_mempool = NULL;
}

/*
 * csio_hw_alloc - Allocate and initialize the HW module.
 * @pdev: PCI device.
 *
 * Allocates HW structure, DMA, memory resources, maps BARS to
 * host memory and initializes HW module.
 */
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static struct csio_hw *csio_hw_alloc(struct pci_dev *pdev)
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{
	struct csio_hw *hw;

	hw = kzalloc(sizeof(struct csio_hw), GFP_KERNEL);
	if (!hw)
		goto err;

	hw->pdev = pdev;
	strncpy(hw->drv_version, CSIO_DRV_VERSION, 32);

	/* memory pool/DMA pool allocation */
	if (csio_resource_alloc(hw))
		goto err_free_hw;

	/* Get the start address of registers from BAR 0 */
	hw->regstart = ioremap_nocache(pci_resource_start(pdev, 0),
				       pci_resource_len(pdev, 0));
	if (!hw->regstart) {
		csio_err(hw, "Could not map BAR 0, regstart = %p\n",
			 hw->regstart);
		goto err_resource_free;
	}

	csio_hw_init_workers(hw);

	if (csio_hw_init(hw))
		goto err_unmap_bar;

	csio_dfs_create(hw);

	csio_dbg(hw, "hw:%p\n", hw);

	return hw;

err_unmap_bar:
	csio_hw_exit_workers(hw);
	iounmap(hw->regstart);
err_resource_free:
	csio_resource_free(hw);
err_free_hw:
	kfree(hw);
err:
	return NULL;
}

/*
 * csio_hw_free - Uninitialize and free the HW module.
 * @hw: The HW module
 *
 * Disable interrupts, uninit the HW module, free resources, free hw.
 */
static void
csio_hw_free(struct csio_hw *hw)
{
	csio_intr_disable(hw, true);
	csio_hw_exit_workers(hw);
	csio_hw_exit(hw);
	iounmap(hw->regstart);
	csio_dfs_destroy(hw);
	csio_resource_free(hw);
	kfree(hw);
}

/**
 * csio_shost_init - Create and initialize the lnode module.
 * @hw:		The HW module.
 * @dev:	The device associated with this invocation.
 * @probe:	Called from probe context or not?
 * @os_pln:	Parent lnode if any.
 *
 * Allocates lnode structure via scsi_host_alloc, initializes
 * shost, initializes lnode module and registers with SCSI ML
 * via scsi_host_add. This function is shared between physical and
 * virtual node ports.
 */
struct csio_lnode *
csio_shost_init(struct csio_hw *hw, struct device *dev,
		  bool probe, struct csio_lnode *pln)
{
	struct Scsi_Host  *shost = NULL;
	struct csio_lnode *ln;

	csio_fcoe_shost_template.cmd_per_lun = csio_lun_qdepth;
	csio_fcoe_shost_vport_template.cmd_per_lun = csio_lun_qdepth;

	/*
	 * hw->pdev is the physical port's PCI dev structure,
	 * which will be different from the NPIV dev structure.
	 */
	if (dev == &hw->pdev->dev)
		shost = scsi_host_alloc(
				&csio_fcoe_shost_template,
				sizeof(struct csio_lnode));
	else
		shost = scsi_host_alloc(
				&csio_fcoe_shost_vport_template,
				sizeof(struct csio_lnode));

	if (!shost)
		goto err;

	ln = shost_priv(shost);
	memset(ln, 0, sizeof(struct csio_lnode));

	/* Link common lnode to this lnode */
	ln->dev_num = (shost->host_no << 16);

	shost->can_queue = CSIO_MAX_QUEUE;
	shost->this_id = -1;
	shost->unique_id = shost->host_no;
	shost->max_cmd_len = 16; /* Max CDB length supported */
	shost->max_id = min_t(uint32_t, csio_fcoe_rnodes,
			      hw->fres_info.max_ssns);
	shost->max_lun = CSIO_MAX_LUN;
	if (dev == &hw->pdev->dev)
		shost->transportt = csio_fcoe_transport;
	else
		shost->transportt = csio_fcoe_transport_vport;

	/* root lnode */
	if (!hw->rln)
		hw->rln = ln;

	/* Other initialization here: Common, Transport specific */
	if (csio_lnode_init(ln, hw, pln))
		goto err_shost_put;

644
	if (scsi_add_host_with_dma(shost, dev, &hw->pdev->dev))
645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939
		goto err_lnode_exit;

	return ln;

err_lnode_exit:
	csio_lnode_exit(ln);
err_shost_put:
	scsi_host_put(shost);
err:
	return NULL;
}

/**
 * csio_shost_exit - De-instantiate the shost.
 * @ln:		The lnode module corresponding to the shost.
 *
 */
void
csio_shost_exit(struct csio_lnode *ln)
{
	struct Scsi_Host *shost = csio_ln_to_shost(ln);
	struct csio_hw *hw = csio_lnode_to_hw(ln);

	/* Inform transport */
	fc_remove_host(shost);

	/* Inform SCSI ML */
	scsi_remove_host(shost);

	/* Flush all the events, so that any rnode removal events
	 * already queued are all handled, before we remove the lnode.
	 */
	spin_lock_irq(&hw->lock);
	csio_evtq_flush(hw);
	spin_unlock_irq(&hw->lock);

	csio_lnode_exit(ln);
	scsi_host_put(shost);
}

struct csio_lnode *
csio_lnode_alloc(struct csio_hw *hw)
{
	return csio_shost_init(hw, &hw->pdev->dev, false, NULL);
}

void
csio_lnodes_block_request(struct csio_hw *hw)
{
	struct Scsi_Host  *shost;
	struct csio_lnode *sln;
	struct csio_lnode *ln;
	struct list_head *cur_ln, *cur_cln;
	struct csio_lnode **lnode_list;
	int cur_cnt = 0, ii;

	lnode_list = kzalloc((sizeof(struct csio_lnode *) * hw->num_lns),
			GFP_KERNEL);
	if (!lnode_list) {
		csio_err(hw, "Failed to allocate lnodes_list");
		return;
	}

	spin_lock_irq(&hw->lock);
	/* Traverse sibling lnodes */
	list_for_each(cur_ln, &hw->sln_head) {
		sln = (struct csio_lnode *) cur_ln;
		lnode_list[cur_cnt++] = sln;

		/* Traverse children lnodes */
		list_for_each(cur_cln, &sln->cln_head)
			lnode_list[cur_cnt++] = (struct csio_lnode *) cur_cln;
	}
	spin_unlock_irq(&hw->lock);

	for (ii = 0; ii < cur_cnt; ii++) {
		csio_dbg(hw, "Blocking IOs on lnode: %p\n", lnode_list[ii]);
		ln = lnode_list[ii];
		shost = csio_ln_to_shost(ln);
		scsi_block_requests(shost);

	}
	kfree(lnode_list);
}

void
csio_lnodes_unblock_request(struct csio_hw *hw)
{
	struct csio_lnode *ln;
	struct Scsi_Host  *shost;
	struct csio_lnode *sln;
	struct list_head *cur_ln, *cur_cln;
	struct csio_lnode **lnode_list;
	int cur_cnt = 0, ii;

	lnode_list = kzalloc((sizeof(struct csio_lnode *) * hw->num_lns),
			GFP_KERNEL);
	if (!lnode_list) {
		csio_err(hw, "Failed to allocate lnodes_list");
		return;
	}

	spin_lock_irq(&hw->lock);
	/* Traverse sibling lnodes */
	list_for_each(cur_ln, &hw->sln_head) {
		sln = (struct csio_lnode *) cur_ln;
		lnode_list[cur_cnt++] = sln;

		/* Traverse children lnodes */
		list_for_each(cur_cln, &sln->cln_head)
			lnode_list[cur_cnt++] = (struct csio_lnode *) cur_cln;
	}
	spin_unlock_irq(&hw->lock);

	for (ii = 0; ii < cur_cnt; ii++) {
		csio_dbg(hw, "unblocking IOs on lnode: %p\n", lnode_list[ii]);
		ln = lnode_list[ii];
		shost = csio_ln_to_shost(ln);
		scsi_unblock_requests(shost);
	}
	kfree(lnode_list);
}

void
csio_lnodes_block_by_port(struct csio_hw *hw, uint8_t portid)
{
	struct csio_lnode *ln;
	struct Scsi_Host  *shost;
	struct csio_lnode *sln;
	struct list_head *cur_ln, *cur_cln;
	struct csio_lnode **lnode_list;
	int cur_cnt = 0, ii;

	lnode_list = kzalloc((sizeof(struct csio_lnode *) * hw->num_lns),
			GFP_KERNEL);
	if (!lnode_list) {
		csio_err(hw, "Failed to allocate lnodes_list");
		return;
	}

	spin_lock_irq(&hw->lock);
	/* Traverse sibling lnodes */
	list_for_each(cur_ln, &hw->sln_head) {
		sln = (struct csio_lnode *) cur_ln;
		if (sln->portid != portid)
			continue;

		lnode_list[cur_cnt++] = sln;

		/* Traverse children lnodes */
		list_for_each(cur_cln, &sln->cln_head)
			lnode_list[cur_cnt++] = (struct csio_lnode *) cur_cln;
	}
	spin_unlock_irq(&hw->lock);

	for (ii = 0; ii < cur_cnt; ii++) {
		csio_dbg(hw, "Blocking IOs on lnode: %p\n", lnode_list[ii]);
		ln = lnode_list[ii];
		shost = csio_ln_to_shost(ln);
		scsi_block_requests(shost);
	}
	kfree(lnode_list);
}

void
csio_lnodes_unblock_by_port(struct csio_hw *hw, uint8_t portid)
{
	struct csio_lnode *ln;
	struct Scsi_Host  *shost;
	struct csio_lnode *sln;
	struct list_head *cur_ln, *cur_cln;
	struct csio_lnode **lnode_list;
	int cur_cnt = 0, ii;

	lnode_list = kzalloc((sizeof(struct csio_lnode *) * hw->num_lns),
			GFP_KERNEL);
	if (!lnode_list) {
		csio_err(hw, "Failed to allocate lnodes_list");
		return;
	}

	spin_lock_irq(&hw->lock);
	/* Traverse sibling lnodes */
	list_for_each(cur_ln, &hw->sln_head) {
		sln = (struct csio_lnode *) cur_ln;
		if (sln->portid != portid)
			continue;
		lnode_list[cur_cnt++] = sln;

		/* Traverse children lnodes */
		list_for_each(cur_cln, &sln->cln_head)
			lnode_list[cur_cnt++] = (struct csio_lnode *) cur_cln;
	}
	spin_unlock_irq(&hw->lock);

	for (ii = 0; ii < cur_cnt; ii++) {
		csio_dbg(hw, "unblocking IOs on lnode: %p\n", lnode_list[ii]);
		ln = lnode_list[ii];
		shost = csio_ln_to_shost(ln);
		scsi_unblock_requests(shost);
	}
	kfree(lnode_list);
}

void
csio_lnodes_exit(struct csio_hw *hw, bool npiv)
{
	struct csio_lnode *sln;
	struct csio_lnode *ln;
	struct list_head *cur_ln, *cur_cln;
	struct csio_lnode **lnode_list;
	int cur_cnt = 0, ii;

	lnode_list = kzalloc((sizeof(struct csio_lnode *) * hw->num_lns),
			GFP_KERNEL);
	if (!lnode_list) {
		csio_err(hw, "lnodes_exit: Failed to allocate lnodes_list.\n");
		return;
	}

	/* Get all child lnodes(NPIV ports) */
	spin_lock_irq(&hw->lock);
	list_for_each(cur_ln, &hw->sln_head) {
		sln = (struct csio_lnode *) cur_ln;

		/* Traverse children lnodes */
		list_for_each(cur_cln, &sln->cln_head)
			lnode_list[cur_cnt++] = (struct csio_lnode *) cur_cln;
	}
	spin_unlock_irq(&hw->lock);

	/* Delete NPIV lnodes */
	for (ii = 0; ii < cur_cnt; ii++) {
		csio_dbg(hw, "Deleting child lnode: %p\n", lnode_list[ii]);
		ln = lnode_list[ii];
		fc_vport_terminate(ln->fc_vport);
	}

	/* Delete only npiv lnodes */
	if (npiv)
		goto free_lnodes;

	cur_cnt = 0;
	/* Get all physical lnodes */
	spin_lock_irq(&hw->lock);
	/* Traverse sibling lnodes */
	list_for_each(cur_ln, &hw->sln_head) {
		sln = (struct csio_lnode *) cur_ln;
		lnode_list[cur_cnt++] = sln;
	}
	spin_unlock_irq(&hw->lock);

	/* Delete physical lnodes */
	for (ii = 0; ii < cur_cnt; ii++) {
		csio_dbg(hw, "Deleting parent lnode: %p\n", lnode_list[ii]);
		csio_shost_exit(lnode_list[ii]);
	}

free_lnodes:
	kfree(lnode_list);
}

/*
 * csio_lnode_init_post: Set lnode attributes after starting HW.
 * @ln: lnode.
 *
 */
static void
csio_lnode_init_post(struct csio_lnode *ln)
{
	struct Scsi_Host  *shost = csio_ln_to_shost(ln);

	csio_fchost_attr_init(ln);

	scsi_scan_host(shost);
}

/*
 * csio_probe_one - Instantiate this function.
 * @pdev: PCI device
 * @id: Device ID
 *
 * This is the .probe() callback of the driver. This function:
 * - Initializes the PCI function by enabling MMIO, setting bus
 *   mastership and setting DMA mask.
 * - Allocates HW structure, DMA, memory resources, maps BARS to
 *   host memory and initializes HW module.
 * - Allocates lnode structure via scsi_host_alloc, initializes
 *   shost, initialized lnode module and registers with SCSI ML
 *   via scsi_host_add.
 * - Enables interrupts, and starts the chip by kicking off the
 *   HW state machine.
 * - Once hardware is ready, initiated scan of the host via
 *   scsi_scan_host.
 */
940
static int csio_probe_one(struct pci_dev *pdev, const struct pci_device_id *id)
941 942 943 944 945 946 947
{
	int rv;
	int bars;
	int i;
	struct csio_hw *hw;
	struct csio_lnode *ln;

948 949 950
	/* probe only T5 and T6 cards */
	if (!csio_is_t5((pdev->device & CSIO_HW_CHIP_MASK)) &&
	    !csio_is_t6((pdev->device & CSIO_HW_CHIP_MASK)))
951 952
		return -ENODEV;

953 954 955 956 957 958 959 960 961 962
	rv = csio_pci_init(pdev, &bars);
	if (rv)
		goto err;

	hw = csio_hw_alloc(pdev);
	if (!hw) {
		rv = -ENODEV;
		goto err_pci_exit;
	}

963 964 965
	if (!pcie_relaxed_ordering_enabled(pdev))
		hw->flags |= CSIO_HWF_ROOT_NO_RELAXED_ORDERING;

966 967
	pci_set_drvdata(pdev, hw);

968 969 970 971 972 973 974 975
	rv = csio_hw_start(hw);
	if (rv) {
		if (rv == -EINVAL) {
			dev_err(&pdev->dev,
				"Failed to start FW, continuing in debug mode.\n");
			return 0;
		}
		goto err_lnode_exit;
976 977 978
	}

	sprintf(hw->fwrev_str, "%u.%u.%u.%u\n",
979 980 981 982
		    FW_HDR_FW_VER_MAJOR_G(hw->fwrev),
		    FW_HDR_FW_VER_MINOR_G(hw->fwrev),
		    FW_HDR_FW_VER_MICRO_G(hw->fwrev),
		    FW_HDR_FW_VER_BUILD_G(hw->fwrev));
983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029

	for (i = 0; i < hw->num_pports; i++) {
		ln = csio_shost_init(hw, &pdev->dev, true, NULL);
		if (!ln) {
			rv = -ENODEV;
			break;
		}
		/* Initialize portid */
		ln->portid = hw->pport[i].portid;

		spin_lock_irq(&hw->lock);
		if (csio_lnode_start(ln) != 0)
			rv = -ENODEV;
		spin_unlock_irq(&hw->lock);

		if (rv)
			break;

		csio_lnode_init_post(ln);
	}

	if (rv)
		goto err_lnode_exit;

	return 0;

err_lnode_exit:
	csio_lnodes_block_request(hw);
	spin_lock_irq(&hw->lock);
	csio_hw_stop(hw);
	spin_unlock_irq(&hw->lock);
	csio_lnodes_unblock_request(hw);
	csio_lnodes_exit(hw, 0);
	csio_hw_free(hw);
err_pci_exit:
	csio_pci_exit(pdev, &bars);
err:
	dev_err(&pdev->dev, "probe of device failed: %d\n", rv);
	return rv;
}

/*
 * csio_remove_one - Remove one instance of the driver at this PCI function.
 * @pdev: PCI device
 *
 * Used during hotplug operation.
 */
1030
static void csio_remove_one(struct pci_dev *pdev)
1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170
{
	struct csio_hw *hw = pci_get_drvdata(pdev);
	int bars = pci_select_bars(pdev, IORESOURCE_MEM);

	csio_lnodes_block_request(hw);
	spin_lock_irq(&hw->lock);

	/* Stops lnode, Rnode s/m
	 * Quiesce IOs.
	 * All sessions with remote ports are unregistered.
	 */
	csio_hw_stop(hw);
	spin_unlock_irq(&hw->lock);
	csio_lnodes_unblock_request(hw);

	csio_lnodes_exit(hw, 0);
	csio_hw_free(hw);
	csio_pci_exit(pdev, &bars);
}

/*
 * csio_pci_error_detected - PCI error was detected
 * @pdev: PCI device
 *
 */
static pci_ers_result_t
csio_pci_error_detected(struct pci_dev *pdev, pci_channel_state_t state)
{
	struct csio_hw *hw = pci_get_drvdata(pdev);

	csio_lnodes_block_request(hw);
	spin_lock_irq(&hw->lock);

	/* Post PCI error detected evt to HW s/m
	 * HW s/m handles this evt by quiescing IOs, unregisters rports
	 * and finally takes the device to offline.
	 */
	csio_post_event(&hw->sm, CSIO_HWE_PCIERR_DETECTED);
	spin_unlock_irq(&hw->lock);
	csio_lnodes_unblock_request(hw);
	csio_lnodes_exit(hw, 0);
	csio_intr_disable(hw, true);
	pci_disable_device(pdev);
	return state == pci_channel_io_perm_failure ?
		PCI_ERS_RESULT_DISCONNECT : PCI_ERS_RESULT_NEED_RESET;
}

/*
 * csio_pci_slot_reset - PCI slot has been reset.
 * @pdev: PCI device
 *
 */
static pci_ers_result_t
csio_pci_slot_reset(struct pci_dev *pdev)
{
	struct csio_hw *hw = pci_get_drvdata(pdev);
	int ready;

	if (pci_enable_device(pdev)) {
		dev_err(&pdev->dev, "cannot re-enable device in slot reset\n");
		return PCI_ERS_RESULT_DISCONNECT;
	}

	pci_set_master(pdev);
	pci_restore_state(pdev);
	pci_save_state(pdev);

	/* Bring HW s/m to ready state.
	 * but don't resume IOs.
	 */
	spin_lock_irq(&hw->lock);
	csio_post_event(&hw->sm, CSIO_HWE_PCIERR_SLOT_RESET);
	ready = csio_is_hw_ready(hw);
	spin_unlock_irq(&hw->lock);

	if (ready) {
		return PCI_ERS_RESULT_RECOVERED;
	} else {
		dev_err(&pdev->dev, "Can't initialize HW when in slot reset\n");
		return PCI_ERS_RESULT_DISCONNECT;
	}
}

/*
 * csio_pci_resume - Resume normal operations
 * @pdev: PCI device
 *
 */
static void
csio_pci_resume(struct pci_dev *pdev)
{
	struct csio_hw *hw = pci_get_drvdata(pdev);
	struct csio_lnode *ln;
	int rv = 0;
	int i;

	/* Bring the LINK UP and Resume IO */

	for (i = 0; i < hw->num_pports; i++) {
		ln = csio_shost_init(hw, &pdev->dev, true, NULL);
		if (!ln) {
			rv = -ENODEV;
			break;
		}
		/* Initialize portid */
		ln->portid = hw->pport[i].portid;

		spin_lock_irq(&hw->lock);
		if (csio_lnode_start(ln) != 0)
			rv = -ENODEV;
		spin_unlock_irq(&hw->lock);

		if (rv)
			break;

		csio_lnode_init_post(ln);
	}

	if (rv)
		goto err_resume_exit;

	return;

err_resume_exit:
	csio_lnodes_block_request(hw);
	spin_lock_irq(&hw->lock);
	csio_hw_stop(hw);
	spin_unlock_irq(&hw->lock);
	csio_lnodes_unblock_request(hw);
	csio_lnodes_exit(hw, 0);
	csio_hw_free(hw);
	dev_err(&pdev->dev, "resume of device failed: %d\n", rv);
}

static struct pci_error_handlers csio_err_handler = {
	.error_detected = csio_pci_error_detected,
	.slot_reset	= csio_pci_slot_reset,
	.resume		= csio_pci_resume,
};

1171 1172 1173 1174
/*
 *  Macros needed to support the PCI Device ID Table ...
 */
#define CH_PCI_DEVICE_ID_TABLE_DEFINE_BEGIN \
1175
	static const struct pci_device_id csio_pci_tbl[] = {
1176 1177
/* Define for FCoE uses PF6 */
#define CH_PCI_DEVICE_ID_FUNCTION	0x6
1178 1179 1180 1181 1182

#define CH_PCI_ID_TABLE_ENTRY(devid) \
		{ PCI_VDEVICE(CHELSIO, (devid)), 0 }

#define CH_PCI_DEVICE_ID_TABLE_DEFINE_END { 0, } }
1183

1184
#include "t4_pci_id_tbl.h"
1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251

static struct pci_driver csio_pci_driver = {
	.name		= KBUILD_MODNAME,
	.driver		= {
		.owner	= THIS_MODULE,
	},
	.id_table	= csio_pci_tbl,
	.probe		= csio_probe_one,
	.remove		= csio_remove_one,
	.err_handler	= &csio_err_handler,
};

/*
 * csio_init - Chelsio storage driver initialization function.
 *
 */
static int __init
csio_init(void)
{
	int rv = -ENOMEM;

	pr_info("%s %s\n", CSIO_DRV_DESC, CSIO_DRV_VERSION);

	csio_dfs_init();

	csio_fcoe_transport = fc_attach_transport(&csio_fc_transport_funcs);
	if (!csio_fcoe_transport)
		goto err;

	csio_fcoe_transport_vport =
			fc_attach_transport(&csio_fc_transport_vport_funcs);
	if (!csio_fcoe_transport_vport)
		goto err_vport;

	rv = pci_register_driver(&csio_pci_driver);
	if (rv)
		goto err_pci;

	return 0;

err_pci:
	fc_release_transport(csio_fcoe_transport_vport);
err_vport:
	fc_release_transport(csio_fcoe_transport);
err:
	csio_dfs_exit();
	return rv;
}

/*
 * csio_exit - Chelsio storage driver uninitialization .
 *
 * Function that gets called in the unload path.
 */
static void __exit
csio_exit(void)
{
	pci_unregister_driver(&csio_pci_driver);
	csio_dfs_exit();
	fc_release_transport(csio_fcoe_transport_vport);
	fc_release_transport(csio_fcoe_transport);
}

module_init(csio_init);
module_exit(csio_exit);
MODULE_AUTHOR(CSIO_DRV_AUTHOR);
MODULE_DESCRIPTION(CSIO_DRV_DESC);
1252
MODULE_LICENSE("Dual BSD/GPL");
1253 1254
MODULE_DEVICE_TABLE(pci, csio_pci_tbl);
MODULE_VERSION(CSIO_DRV_VERSION);
1255
MODULE_FIRMWARE(FW_FNAME_T5);
1256
MODULE_FIRMWARE(FW_FNAME_T6);