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0001 /*
0002  * This file is part of the Chelsio FCoE driver for Linux.
0003  *
0004  * Copyright (c) 2008-2012 Chelsio Communications, Inc. All rights reserved.
0005  *
0006  * This software is available to you under a choice of one of two
0007  * licenses.  You may choose to be licensed under the terms of the GNU
0008  * General Public License (GPL) Version 2, available from the file
0009  * COPYING in the main directory of this source tree, or the
0010  * OpenIB.org BSD license below:
0011  *
0012  *     Redistribution and use in source and binary forms, with or
0013  *     without modification, are permitted provided that the following
0014  *     conditions are met:
0015  *
0016  *      - Redistributions of source code must retain the above
0017  *        copyright notice, this list of conditions and the following
0018  *        disclaimer.
0019  *
0020  *      - Redistributions in binary form must reproduce the above
0021  *        copyright notice, this list of conditions and the following
0022  *        disclaimer in the documentation and/or other materials
0023  *        provided with the distribution.
0024  *
0025  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
0026  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
0027  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
0028  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
0029  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
0030  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
0031  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
0032  * SOFTWARE.
0033  */
0034 
0035 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
0036 
0037 #include <linux/kernel.h>
0038 #include <linux/module.h>
0039 #include <linux/init.h>
0040 #include <linux/pci.h>
0041 #include <linux/aer.h>
0042 #include <linux/mm.h>
0043 #include <linux/notifier.h>
0044 #include <linux/kdebug.h>
0045 #include <linux/seq_file.h>
0046 #include <linux/debugfs.h>
0047 #include <linux/string.h>
0048 #include <linux/export.h>
0049 
0050 #include "csio_init.h"
0051 #include "csio_defs.h"
0052 
0053 #define CSIO_MIN_MEMPOOL_SZ 64
0054 
0055 static struct dentry *csio_debugfs_root;
0056 
0057 static struct scsi_transport_template *csio_fcoe_transport;
0058 static struct scsi_transport_template *csio_fcoe_transport_vport;
0059 
0060 /*
0061  * debugfs support
0062  */
0063 static ssize_t
0064 csio_mem_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
0065 {
0066     loff_t pos = *ppos;
0067     loff_t avail = file_inode(file)->i_size;
0068     unsigned int mem = (uintptr_t)file->private_data & 3;
0069     struct csio_hw *hw = file->private_data - mem;
0070 
0071     if (pos < 0)
0072         return -EINVAL;
0073     if (pos >= avail)
0074         return 0;
0075     if (count > avail - pos)
0076         count = avail - pos;
0077 
0078     while (count) {
0079         size_t len;
0080         int ret, ofst;
0081         __be32 data[16];
0082 
0083         if (mem == MEM_MC)
0084             ret = hw->chip_ops->chip_mc_read(hw, 0, pos,
0085                              data, NULL);
0086         else
0087             ret = hw->chip_ops->chip_edc_read(hw, mem, pos,
0088                               data, NULL);
0089         if (ret)
0090             return ret;
0091 
0092         ofst = pos % sizeof(data);
0093         len = min(count, sizeof(data) - ofst);
0094         if (copy_to_user(buf, (u8 *)data + ofst, len))
0095             return -EFAULT;
0096 
0097         buf += len;
0098         pos += len;
0099         count -= len;
0100     }
0101     count = pos - *ppos;
0102     *ppos = pos;
0103     return count;
0104 }
0105 
0106 static const struct file_operations csio_mem_debugfs_fops = {
0107     .owner   = THIS_MODULE,
0108     .open    = simple_open,
0109     .read    = csio_mem_read,
0110     .llseek  = default_llseek,
0111 };
0112 
0113 void csio_add_debugfs_mem(struct csio_hw *hw, const char *name,
0114                  unsigned int idx, unsigned int size_mb)
0115 {
0116     debugfs_create_file_size(name, S_IRUSR, hw->debugfs_root,
0117                  (void *)hw + idx, &csio_mem_debugfs_fops,
0118                  size_mb << 20);
0119 }
0120 
0121 static int csio_setup_debugfs(struct csio_hw *hw)
0122 {
0123     int i;
0124 
0125     if (IS_ERR_OR_NULL(hw->debugfs_root))
0126         return -1;
0127 
0128     i = csio_rd_reg32(hw, MA_TARGET_MEM_ENABLE_A);
0129     if (i & EDRAM0_ENABLE_F)
0130         csio_add_debugfs_mem(hw, "edc0", MEM_EDC0, 5);
0131     if (i & EDRAM1_ENABLE_F)
0132         csio_add_debugfs_mem(hw, "edc1", MEM_EDC1, 5);
0133 
0134     hw->chip_ops->chip_dfs_create_ext_mem(hw);
0135     return 0;
0136 }
0137 
0138 /*
0139  * csio_dfs_create - Creates and sets up per-hw debugfs.
0140  *
0141  */
0142 static int
0143 csio_dfs_create(struct csio_hw *hw)
0144 {
0145     if (csio_debugfs_root) {
0146         hw->debugfs_root = debugfs_create_dir(pci_name(hw->pdev),
0147                             csio_debugfs_root);
0148         csio_setup_debugfs(hw);
0149     }
0150 
0151     return 0;
0152 }
0153 
0154 /*
0155  * csio_dfs_destroy - Destroys per-hw debugfs.
0156  */
0157 static void
0158 csio_dfs_destroy(struct csio_hw *hw)
0159 {
0160     debugfs_remove_recursive(hw->debugfs_root);
0161 }
0162 
0163 /*
0164  * csio_dfs_init - Debug filesystem initialization for the module.
0165  *
0166  */
0167 static void
0168 csio_dfs_init(void)
0169 {
0170     csio_debugfs_root = debugfs_create_dir(KBUILD_MODNAME, NULL);
0171 }
0172 
0173 /*
0174  * csio_dfs_exit - debugfs cleanup for the module.
0175  */
0176 static void
0177 csio_dfs_exit(void)
0178 {
0179     debugfs_remove(csio_debugfs_root);
0180 }
0181 
0182 /*
0183  * csio_pci_init - PCI initialization.
0184  * @pdev: PCI device.
0185  * @bars: Bitmask of bars to be requested.
0186  *
0187  * Initializes the PCI function by enabling MMIO, setting bus
0188  * mastership and setting DMA mask.
0189  */
0190 static int
0191 csio_pci_init(struct pci_dev *pdev, int *bars)
0192 {
0193     int rv = -ENODEV;
0194 
0195     *bars = pci_select_bars(pdev, IORESOURCE_MEM);
0196 
0197     if (pci_enable_device_mem(pdev))
0198         goto err;
0199 
0200     if (pci_request_selected_regions(pdev, *bars, KBUILD_MODNAME))
0201         goto err_disable_device;
0202 
0203     pci_set_master(pdev);
0204     pci_try_set_mwi(pdev);
0205 
0206     rv = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
0207     if (rv)
0208         rv = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
0209     if (rv) {
0210         rv = -ENODEV;
0211         dev_err(&pdev->dev, "No suitable DMA available.\n");
0212         goto err_release_regions;
0213     }
0214 
0215     return 0;
0216 
0217 err_release_regions:
0218     pci_release_selected_regions(pdev, *bars);
0219 err_disable_device:
0220     pci_disable_device(pdev);
0221 err:
0222     return rv;
0223 
0224 }
0225 
0226 /*
0227  * csio_pci_exit - PCI unitialization.
0228  * @pdev: PCI device.
0229  * @bars: Bars to be released.
0230  *
0231  */
0232 static void
0233 csio_pci_exit(struct pci_dev *pdev, int *bars)
0234 {
0235     pci_release_selected_regions(pdev, *bars);
0236     pci_disable_device(pdev);
0237 }
0238 
0239 /*
0240  * csio_hw_init_workers - Initialize the HW module's worker threads.
0241  * @hw: HW module.
0242  *
0243  */
0244 static void
0245 csio_hw_init_workers(struct csio_hw *hw)
0246 {
0247     INIT_WORK(&hw->evtq_work, csio_evtq_worker);
0248 }
0249 
0250 static void
0251 csio_hw_exit_workers(struct csio_hw *hw)
0252 {
0253     cancel_work_sync(&hw->evtq_work);
0254 }
0255 
0256 static int
0257 csio_create_queues(struct csio_hw *hw)
0258 {
0259     int i, j;
0260     struct csio_mgmtm *mgmtm = csio_hw_to_mgmtm(hw);
0261     int rv;
0262     struct csio_scsi_cpu_info *info;
0263 
0264     if (hw->flags & CSIO_HWF_Q_FW_ALLOCED)
0265         return 0;
0266 
0267     if (hw->intr_mode != CSIO_IM_MSIX) {
0268         rv = csio_wr_iq_create(hw, NULL, hw->intr_iq_idx,
0269                     0, hw->pport[0].portid, false, NULL);
0270         if (rv != 0) {
0271             csio_err(hw, " Forward Interrupt IQ failed!: %d\n", rv);
0272             return rv;
0273         }
0274     }
0275 
0276     /* FW event queue */
0277     rv = csio_wr_iq_create(hw, NULL, hw->fwevt_iq_idx,
0278                    csio_get_fwevt_intr_idx(hw),
0279                    hw->pport[0].portid, true, NULL);
0280     if (rv != 0) {
0281         csio_err(hw, "FW event IQ config failed!: %d\n", rv);
0282         return rv;
0283     }
0284 
0285     /* Create mgmt queue */
0286     rv = csio_wr_eq_create(hw, NULL, mgmtm->eq_idx,
0287             mgmtm->iq_idx, hw->pport[0].portid, NULL);
0288 
0289     if (rv != 0) {
0290         csio_err(hw, "Mgmt EQ create failed!: %d\n", rv);
0291         goto err;
0292     }
0293 
0294     /* Create SCSI queues */
0295     for (i = 0; i < hw->num_pports; i++) {
0296         info = &hw->scsi_cpu_info[i];
0297 
0298         for (j = 0; j < info->max_cpus; j++) {
0299             struct csio_scsi_qset *sqset = &hw->sqset[i][j];
0300 
0301             rv = csio_wr_iq_create(hw, NULL, sqset->iq_idx,
0302                            sqset->intr_idx, i, false, NULL);
0303             if (rv != 0) {
0304                 csio_err(hw,
0305                    "SCSI module IQ config failed [%d][%d]:%d\n",
0306                    i, j, rv);
0307                 goto err;
0308             }
0309             rv = csio_wr_eq_create(hw, NULL, sqset->eq_idx,
0310                            sqset->iq_idx, i, NULL);
0311             if (rv != 0) {
0312                 csio_err(hw,
0313                    "SCSI module EQ config failed [%d][%d]:%d\n",
0314                    i, j, rv);
0315                 goto err;
0316             }
0317         } /* for all CPUs */
0318     } /* For all ports */
0319 
0320     hw->flags |= CSIO_HWF_Q_FW_ALLOCED;
0321     return 0;
0322 err:
0323     csio_wr_destroy_queues(hw, true);
0324     return -EINVAL;
0325 }
0326 
0327 /*
0328  * csio_config_queues - Configure the DMA queues.
0329  * @hw: HW module.
0330  *
0331  * Allocates memory for queues are registers them with FW.
0332  */
0333 int
0334 csio_config_queues(struct csio_hw *hw)
0335 {
0336     int i, j, idx, k = 0;
0337     int rv;
0338     struct csio_scsi_qset *sqset;
0339     struct csio_mgmtm *mgmtm = csio_hw_to_mgmtm(hw);
0340     struct csio_scsi_qset *orig;
0341     struct csio_scsi_cpu_info *info;
0342 
0343     if (hw->flags & CSIO_HWF_Q_MEM_ALLOCED)
0344         return csio_create_queues(hw);
0345 
0346     /* Calculate number of SCSI queues for MSIX we would like */
0347     hw->num_scsi_msix_cpus = num_online_cpus();
0348     hw->num_sqsets = num_online_cpus() * hw->num_pports;
0349 
0350     if (hw->num_sqsets > CSIO_MAX_SCSI_QSETS) {
0351         hw->num_sqsets = CSIO_MAX_SCSI_QSETS;
0352         hw->num_scsi_msix_cpus = CSIO_MAX_SCSI_CPU;
0353     }
0354 
0355     /* Initialize max_cpus, may get reduced during msix allocations */
0356     for (i = 0; i < hw->num_pports; i++)
0357         hw->scsi_cpu_info[i].max_cpus = hw->num_scsi_msix_cpus;
0358 
0359     csio_dbg(hw, "nsqsets:%d scpus:%d\n",
0360             hw->num_sqsets, hw->num_scsi_msix_cpus);
0361 
0362     csio_intr_enable(hw);
0363 
0364     if (hw->intr_mode != CSIO_IM_MSIX) {
0365 
0366         /* Allocate Forward interrupt iq. */
0367         hw->intr_iq_idx = csio_wr_alloc_q(hw, CSIO_INTR_IQSIZE,
0368                         CSIO_INTR_WRSIZE, CSIO_INGRESS,
0369                         (void *)hw, 0, 0, NULL);
0370         if (hw->intr_iq_idx == -1) {
0371             csio_err(hw,
0372                  "Forward interrupt queue creation failed\n");
0373             goto intr_disable;
0374         }
0375     }
0376 
0377     /* Allocate the FW evt queue */
0378     hw->fwevt_iq_idx = csio_wr_alloc_q(hw, CSIO_FWEVT_IQSIZE,
0379                        CSIO_FWEVT_WRSIZE,
0380                        CSIO_INGRESS, (void *)hw,
0381                        CSIO_FWEVT_FLBUFS, 0,
0382                        csio_fwevt_intx_handler);
0383     if (hw->fwevt_iq_idx == -1) {
0384         csio_err(hw, "FW evt queue creation failed\n");
0385         goto intr_disable;
0386     }
0387 
0388     /* Allocate the mgmt queue */
0389     mgmtm->eq_idx = csio_wr_alloc_q(hw, CSIO_MGMT_EQSIZE,
0390                       CSIO_MGMT_EQ_WRSIZE,
0391                       CSIO_EGRESS, (void *)hw, 0, 0, NULL);
0392     if (mgmtm->eq_idx == -1) {
0393         csio_err(hw, "Failed to alloc egress queue for mgmt module\n");
0394         goto intr_disable;
0395     }
0396 
0397     /* Use FW IQ for MGMT req completion */
0398     mgmtm->iq_idx = hw->fwevt_iq_idx;
0399 
0400     /* Allocate SCSI queues */
0401     for (i = 0; i < hw->num_pports; i++) {
0402         info = &hw->scsi_cpu_info[i];
0403 
0404         for (j = 0; j < hw->num_scsi_msix_cpus; j++) {
0405             sqset = &hw->sqset[i][j];
0406 
0407             if (j >= info->max_cpus) {
0408                 k = j % info->max_cpus;
0409                 orig = &hw->sqset[i][k];
0410                 sqset->eq_idx = orig->eq_idx;
0411                 sqset->iq_idx = orig->iq_idx;
0412                 continue;
0413             }
0414 
0415             idx = csio_wr_alloc_q(hw, csio_scsi_eqsize, 0,
0416                           CSIO_EGRESS, (void *)hw, 0, 0,
0417                           NULL);
0418             if (idx == -1) {
0419                 csio_err(hw, "EQ creation failed for idx:%d\n",
0420                         idx);
0421                 goto intr_disable;
0422             }
0423 
0424             sqset->eq_idx = idx;
0425 
0426             idx = csio_wr_alloc_q(hw, CSIO_SCSI_IQSIZE,
0427                          CSIO_SCSI_IQ_WRSZ, CSIO_INGRESS,
0428                          (void *)hw, 0, 0,
0429                          csio_scsi_intx_handler);
0430             if (idx == -1) {
0431                 csio_err(hw, "IQ creation failed for idx:%d\n",
0432                         idx);
0433                 goto intr_disable;
0434             }
0435             sqset->iq_idx = idx;
0436         } /* for all CPUs */
0437     } /* For all ports */
0438 
0439     hw->flags |= CSIO_HWF_Q_MEM_ALLOCED;
0440 
0441     rv = csio_create_queues(hw);
0442     if (rv != 0)
0443         goto intr_disable;
0444 
0445     /*
0446      * Now request IRQs for the vectors. In the event of a failure,
0447      * cleanup is handled internally by this function.
0448      */
0449     rv = csio_request_irqs(hw);
0450     if (rv != 0)
0451         return -EINVAL;
0452 
0453     return 0;
0454 
0455 intr_disable:
0456     csio_intr_disable(hw, false);
0457 
0458     return -EINVAL;
0459 }
0460 
0461 static int
0462 csio_resource_alloc(struct csio_hw *hw)
0463 {
0464     struct csio_wrm *wrm = csio_hw_to_wrm(hw);
0465     int rv = -ENOMEM;
0466 
0467     wrm->num_q = ((CSIO_MAX_SCSI_QSETS * 2) + CSIO_HW_NIQ +
0468                CSIO_HW_NEQ + CSIO_HW_NFLQ + CSIO_HW_NINTXQ);
0469 
0470     hw->mb_mempool = mempool_create_kmalloc_pool(CSIO_MIN_MEMPOOL_SZ,
0471                           sizeof(struct csio_mb));
0472     if (!hw->mb_mempool)
0473         goto err;
0474 
0475     hw->rnode_mempool = mempool_create_kmalloc_pool(CSIO_MIN_MEMPOOL_SZ,
0476                              sizeof(struct csio_rnode));
0477     if (!hw->rnode_mempool)
0478         goto err_free_mb_mempool;
0479 
0480     hw->scsi_dma_pool = dma_pool_create("csio_scsi_dma_pool",
0481                         &hw->pdev->dev, CSIO_SCSI_RSP_LEN,
0482                         8, 0);
0483     if (!hw->scsi_dma_pool)
0484         goto err_free_rn_pool;
0485 
0486     return 0;
0487 
0488 err_free_rn_pool:
0489     mempool_destroy(hw->rnode_mempool);
0490     hw->rnode_mempool = NULL;
0491 err_free_mb_mempool:
0492     mempool_destroy(hw->mb_mempool);
0493     hw->mb_mempool = NULL;
0494 err:
0495     return rv;
0496 }
0497 
0498 static void
0499 csio_resource_free(struct csio_hw *hw)
0500 {
0501     dma_pool_destroy(hw->scsi_dma_pool);
0502     hw->scsi_dma_pool = NULL;
0503     mempool_destroy(hw->rnode_mempool);
0504     hw->rnode_mempool = NULL;
0505     mempool_destroy(hw->mb_mempool);
0506     hw->mb_mempool = NULL;
0507 }
0508 
0509 /*
0510  * csio_hw_alloc - Allocate and initialize the HW module.
0511  * @pdev: PCI device.
0512  *
0513  * Allocates HW structure, DMA, memory resources, maps BARS to
0514  * host memory and initializes HW module.
0515  */
0516 static struct csio_hw *csio_hw_alloc(struct pci_dev *pdev)
0517 {
0518     struct csio_hw *hw;
0519 
0520     hw = kzalloc(sizeof(struct csio_hw), GFP_KERNEL);
0521     if (!hw)
0522         goto err;
0523 
0524     hw->pdev = pdev;
0525     strncpy(hw->drv_version, CSIO_DRV_VERSION, 32);
0526 
0527     /* memory pool/DMA pool allocation */
0528     if (csio_resource_alloc(hw))
0529         goto err_free_hw;
0530 
0531     /* Get the start address of registers from BAR 0 */
0532     hw->regstart = ioremap(pci_resource_start(pdev, 0),
0533                        pci_resource_len(pdev, 0));
0534     if (!hw->regstart) {
0535         csio_err(hw, "Could not map BAR 0, regstart = %p\n",
0536              hw->regstart);
0537         goto err_resource_free;
0538     }
0539 
0540     csio_hw_init_workers(hw);
0541 
0542     if (csio_hw_init(hw))
0543         goto err_unmap_bar;
0544 
0545     csio_dfs_create(hw);
0546 
0547     csio_dbg(hw, "hw:%p\n", hw);
0548 
0549     return hw;
0550 
0551 err_unmap_bar:
0552     csio_hw_exit_workers(hw);
0553     iounmap(hw->regstart);
0554 err_resource_free:
0555     csio_resource_free(hw);
0556 err_free_hw:
0557     kfree(hw);
0558 err:
0559     return NULL;
0560 }
0561 
0562 /*
0563  * csio_hw_free - Uninitialize and free the HW module.
0564  * @hw: The HW module
0565  *
0566  * Disable interrupts, uninit the HW module, free resources, free hw.
0567  */
0568 static void
0569 csio_hw_free(struct csio_hw *hw)
0570 {
0571     csio_intr_disable(hw, true);
0572     csio_hw_exit_workers(hw);
0573     csio_hw_exit(hw);
0574     iounmap(hw->regstart);
0575     csio_dfs_destroy(hw);
0576     csio_resource_free(hw);
0577     kfree(hw);
0578 }
0579 
0580 /**
0581  * csio_shost_init - Create and initialize the lnode module.
0582  * @hw:     The HW module.
0583  * @dev:    The device associated with this invocation.
0584  * @probe:  Called from probe context or not?
0585  * @pln:    Parent lnode if any.
0586  *
0587  * Allocates lnode structure via scsi_host_alloc, initializes
0588  * shost, initializes lnode module and registers with SCSI ML
0589  * via scsi_host_add. This function is shared between physical and
0590  * virtual node ports.
0591  */
0592 struct csio_lnode *
0593 csio_shost_init(struct csio_hw *hw, struct device *dev,
0594           bool probe, struct csio_lnode *pln)
0595 {
0596     struct Scsi_Host  *shost = NULL;
0597     struct csio_lnode *ln;
0598 
0599     csio_fcoe_shost_template.cmd_per_lun = csio_lun_qdepth;
0600     csio_fcoe_shost_vport_template.cmd_per_lun = csio_lun_qdepth;
0601 
0602     /*
0603      * hw->pdev is the physical port's PCI dev structure,
0604      * which will be different from the NPIV dev structure.
0605      */
0606     if (dev == &hw->pdev->dev)
0607         shost = scsi_host_alloc(
0608                 &csio_fcoe_shost_template,
0609                 sizeof(struct csio_lnode));
0610     else
0611         shost = scsi_host_alloc(
0612                 &csio_fcoe_shost_vport_template,
0613                 sizeof(struct csio_lnode));
0614 
0615     if (!shost)
0616         goto err;
0617 
0618     ln = shost_priv(shost);
0619     memset(ln, 0, sizeof(struct csio_lnode));
0620 
0621     /* Link common lnode to this lnode */
0622     ln->dev_num = (shost->host_no << 16);
0623 
0624     shost->can_queue = CSIO_MAX_QUEUE;
0625     shost->this_id = -1;
0626     shost->unique_id = shost->host_no;
0627     shost->max_cmd_len = 16; /* Max CDB length supported */
0628     shost->max_id = min_t(uint32_t, csio_fcoe_rnodes,
0629                   hw->fres_info.max_ssns);
0630     shost->max_lun = CSIO_MAX_LUN;
0631     if (dev == &hw->pdev->dev)
0632         shost->transportt = csio_fcoe_transport;
0633     else
0634         shost->transportt = csio_fcoe_transport_vport;
0635 
0636     /* root lnode */
0637     if (!hw->rln)
0638         hw->rln = ln;
0639 
0640     /* Other initialization here: Common, Transport specific */
0641     if (csio_lnode_init(ln, hw, pln))
0642         goto err_shost_put;
0643 
0644     if (scsi_add_host_with_dma(shost, dev, &hw->pdev->dev))
0645         goto err_lnode_exit;
0646 
0647     return ln;
0648 
0649 err_lnode_exit:
0650     csio_lnode_exit(ln);
0651 err_shost_put:
0652     scsi_host_put(shost);
0653 err:
0654     return NULL;
0655 }
0656 
0657 /**
0658  * csio_shost_exit - De-instantiate the shost.
0659  * @ln:     The lnode module corresponding to the shost.
0660  *
0661  */
0662 void
0663 csio_shost_exit(struct csio_lnode *ln)
0664 {
0665     struct Scsi_Host *shost = csio_ln_to_shost(ln);
0666     struct csio_hw *hw = csio_lnode_to_hw(ln);
0667 
0668     /* Inform transport */
0669     fc_remove_host(shost);
0670 
0671     /* Inform SCSI ML */
0672     scsi_remove_host(shost);
0673 
0674     /* Flush all the events, so that any rnode removal events
0675      * already queued are all handled, before we remove the lnode.
0676      */
0677     spin_lock_irq(&hw->lock);
0678     csio_evtq_flush(hw);
0679     spin_unlock_irq(&hw->lock);
0680 
0681     csio_lnode_exit(ln);
0682     scsi_host_put(shost);
0683 }
0684 
0685 struct csio_lnode *
0686 csio_lnode_alloc(struct csio_hw *hw)
0687 {
0688     return csio_shost_init(hw, &hw->pdev->dev, false, NULL);
0689 }
0690 
0691 void
0692 csio_lnodes_block_request(struct csio_hw *hw)
0693 {
0694     struct Scsi_Host  *shost;
0695     struct csio_lnode *sln;
0696     struct csio_lnode *ln;
0697     struct list_head *cur_ln, *cur_cln;
0698     struct csio_lnode **lnode_list;
0699     int cur_cnt = 0, ii;
0700 
0701     lnode_list = kzalloc((sizeof(struct csio_lnode *) * hw->num_lns),
0702             GFP_KERNEL);
0703     if (!lnode_list) {
0704         csio_err(hw, "Failed to allocate lnodes_list");
0705         return;
0706     }
0707 
0708     spin_lock_irq(&hw->lock);
0709     /* Traverse sibling lnodes */
0710     list_for_each(cur_ln, &hw->sln_head) {
0711         sln = (struct csio_lnode *) cur_ln;
0712         lnode_list[cur_cnt++] = sln;
0713 
0714         /* Traverse children lnodes */
0715         list_for_each(cur_cln, &sln->cln_head)
0716             lnode_list[cur_cnt++] = (struct csio_lnode *) cur_cln;
0717     }
0718     spin_unlock_irq(&hw->lock);
0719 
0720     for (ii = 0; ii < cur_cnt; ii++) {
0721         csio_dbg(hw, "Blocking IOs on lnode: %p\n", lnode_list[ii]);
0722         ln = lnode_list[ii];
0723         shost = csio_ln_to_shost(ln);
0724         scsi_block_requests(shost);
0725 
0726     }
0727     kfree(lnode_list);
0728 }
0729 
0730 void
0731 csio_lnodes_unblock_request(struct csio_hw *hw)
0732 {
0733     struct csio_lnode *ln;
0734     struct Scsi_Host  *shost;
0735     struct csio_lnode *sln;
0736     struct list_head *cur_ln, *cur_cln;
0737     struct csio_lnode **lnode_list;
0738     int cur_cnt = 0, ii;
0739 
0740     lnode_list = kzalloc((sizeof(struct csio_lnode *) * hw->num_lns),
0741             GFP_KERNEL);
0742     if (!lnode_list) {
0743         csio_err(hw, "Failed to allocate lnodes_list");
0744         return;
0745     }
0746 
0747     spin_lock_irq(&hw->lock);
0748     /* Traverse sibling lnodes */
0749     list_for_each(cur_ln, &hw->sln_head) {
0750         sln = (struct csio_lnode *) cur_ln;
0751         lnode_list[cur_cnt++] = sln;
0752 
0753         /* Traverse children lnodes */
0754         list_for_each(cur_cln, &sln->cln_head)
0755             lnode_list[cur_cnt++] = (struct csio_lnode *) cur_cln;
0756     }
0757     spin_unlock_irq(&hw->lock);
0758 
0759     for (ii = 0; ii < cur_cnt; ii++) {
0760         csio_dbg(hw, "unblocking IOs on lnode: %p\n", lnode_list[ii]);
0761         ln = lnode_list[ii];
0762         shost = csio_ln_to_shost(ln);
0763         scsi_unblock_requests(shost);
0764     }
0765     kfree(lnode_list);
0766 }
0767 
0768 void
0769 csio_lnodes_block_by_port(struct csio_hw *hw, uint8_t portid)
0770 {
0771     struct csio_lnode *ln;
0772     struct Scsi_Host  *shost;
0773     struct csio_lnode *sln;
0774     struct list_head *cur_ln, *cur_cln;
0775     struct csio_lnode **lnode_list;
0776     int cur_cnt = 0, ii;
0777 
0778     lnode_list = kzalloc((sizeof(struct csio_lnode *) * hw->num_lns),
0779             GFP_KERNEL);
0780     if (!lnode_list) {
0781         csio_err(hw, "Failed to allocate lnodes_list");
0782         return;
0783     }
0784 
0785     spin_lock_irq(&hw->lock);
0786     /* Traverse sibling lnodes */
0787     list_for_each(cur_ln, &hw->sln_head) {
0788         sln = (struct csio_lnode *) cur_ln;
0789         if (sln->portid != portid)
0790             continue;
0791 
0792         lnode_list[cur_cnt++] = sln;
0793 
0794         /* Traverse children lnodes */
0795         list_for_each(cur_cln, &sln->cln_head)
0796             lnode_list[cur_cnt++] = (struct csio_lnode *) cur_cln;
0797     }
0798     spin_unlock_irq(&hw->lock);
0799 
0800     for (ii = 0; ii < cur_cnt; ii++) {
0801         csio_dbg(hw, "Blocking IOs on lnode: %p\n", lnode_list[ii]);
0802         ln = lnode_list[ii];
0803         shost = csio_ln_to_shost(ln);
0804         scsi_block_requests(shost);
0805     }
0806     kfree(lnode_list);
0807 }
0808 
0809 void
0810 csio_lnodes_unblock_by_port(struct csio_hw *hw, uint8_t portid)
0811 {
0812     struct csio_lnode *ln;
0813     struct Scsi_Host  *shost;
0814     struct csio_lnode *sln;
0815     struct list_head *cur_ln, *cur_cln;
0816     struct csio_lnode **lnode_list;
0817     int cur_cnt = 0, ii;
0818 
0819     lnode_list = kzalloc((sizeof(struct csio_lnode *) * hw->num_lns),
0820             GFP_KERNEL);
0821     if (!lnode_list) {
0822         csio_err(hw, "Failed to allocate lnodes_list");
0823         return;
0824     }
0825 
0826     spin_lock_irq(&hw->lock);
0827     /* Traverse sibling lnodes */
0828     list_for_each(cur_ln, &hw->sln_head) {
0829         sln = (struct csio_lnode *) cur_ln;
0830         if (sln->portid != portid)
0831             continue;
0832         lnode_list[cur_cnt++] = sln;
0833 
0834         /* Traverse children lnodes */
0835         list_for_each(cur_cln, &sln->cln_head)
0836             lnode_list[cur_cnt++] = (struct csio_lnode *) cur_cln;
0837     }
0838     spin_unlock_irq(&hw->lock);
0839 
0840     for (ii = 0; ii < cur_cnt; ii++) {
0841         csio_dbg(hw, "unblocking IOs on lnode: %p\n", lnode_list[ii]);
0842         ln = lnode_list[ii];
0843         shost = csio_ln_to_shost(ln);
0844         scsi_unblock_requests(shost);
0845     }
0846     kfree(lnode_list);
0847 }
0848 
0849 void
0850 csio_lnodes_exit(struct csio_hw *hw, bool npiv)
0851 {
0852     struct csio_lnode *sln;
0853     struct csio_lnode *ln;
0854     struct list_head *cur_ln, *cur_cln;
0855     struct csio_lnode **lnode_list;
0856     int cur_cnt = 0, ii;
0857 
0858     lnode_list = kzalloc((sizeof(struct csio_lnode *) * hw->num_lns),
0859             GFP_KERNEL);
0860     if (!lnode_list) {
0861         csio_err(hw, "lnodes_exit: Failed to allocate lnodes_list.\n");
0862         return;
0863     }
0864 
0865     /* Get all child lnodes(NPIV ports) */
0866     spin_lock_irq(&hw->lock);
0867     list_for_each(cur_ln, &hw->sln_head) {
0868         sln = (struct csio_lnode *) cur_ln;
0869 
0870         /* Traverse children lnodes */
0871         list_for_each(cur_cln, &sln->cln_head)
0872             lnode_list[cur_cnt++] = (struct csio_lnode *) cur_cln;
0873     }
0874     spin_unlock_irq(&hw->lock);
0875 
0876     /* Delete NPIV lnodes */
0877     for (ii = 0; ii < cur_cnt; ii++) {
0878         csio_dbg(hw, "Deleting child lnode: %p\n", lnode_list[ii]);
0879         ln = lnode_list[ii];
0880         fc_vport_terminate(ln->fc_vport);
0881     }
0882 
0883     /* Delete only npiv lnodes */
0884     if (npiv)
0885         goto free_lnodes;
0886 
0887     cur_cnt = 0;
0888     /* Get all physical lnodes */
0889     spin_lock_irq(&hw->lock);
0890     /* Traverse sibling lnodes */
0891     list_for_each(cur_ln, &hw->sln_head) {
0892         sln = (struct csio_lnode *) cur_ln;
0893         lnode_list[cur_cnt++] = sln;
0894     }
0895     spin_unlock_irq(&hw->lock);
0896 
0897     /* Delete physical lnodes */
0898     for (ii = 0; ii < cur_cnt; ii++) {
0899         csio_dbg(hw, "Deleting parent lnode: %p\n", lnode_list[ii]);
0900         csio_shost_exit(lnode_list[ii]);
0901     }
0902 
0903 free_lnodes:
0904     kfree(lnode_list);
0905 }
0906 
0907 /*
0908  * csio_lnode_init_post: Set lnode attributes after starting HW.
0909  * @ln: lnode.
0910  *
0911  */
0912 static void
0913 csio_lnode_init_post(struct csio_lnode *ln)
0914 {
0915     struct Scsi_Host  *shost = csio_ln_to_shost(ln);
0916 
0917     csio_fchost_attr_init(ln);
0918 
0919     scsi_scan_host(shost);
0920 }
0921 
0922 /*
0923  * csio_probe_one - Instantiate this function.
0924  * @pdev: PCI device
0925  * @id: Device ID
0926  *
0927  * This is the .probe() callback of the driver. This function:
0928  * - Initializes the PCI function by enabling MMIO, setting bus
0929  *   mastership and setting DMA mask.
0930  * - Allocates HW structure, DMA, memory resources, maps BARS to
0931  *   host memory and initializes HW module.
0932  * - Allocates lnode structure via scsi_host_alloc, initializes
0933  *   shost, initialized lnode module and registers with SCSI ML
0934  *   via scsi_host_add.
0935  * - Enables interrupts, and starts the chip by kicking off the
0936  *   HW state machine.
0937  * - Once hardware is ready, initiated scan of the host via
0938  *   scsi_scan_host.
0939  */
0940 static int csio_probe_one(struct pci_dev *pdev, const struct pci_device_id *id)
0941 {
0942     int rv;
0943     int bars;
0944     int i;
0945     struct csio_hw *hw;
0946     struct csio_lnode *ln;
0947 
0948     /* probe only T5 and T6 cards */
0949     if (!csio_is_t5((pdev->device & CSIO_HW_CHIP_MASK)) &&
0950         !csio_is_t6((pdev->device & CSIO_HW_CHIP_MASK)))
0951         return -ENODEV;
0952 
0953     rv = csio_pci_init(pdev, &bars);
0954     if (rv)
0955         goto err;
0956 
0957     hw = csio_hw_alloc(pdev);
0958     if (!hw) {
0959         rv = -ENODEV;
0960         goto err_pci_exit;
0961     }
0962 
0963     if (!pcie_relaxed_ordering_enabled(pdev))
0964         hw->flags |= CSIO_HWF_ROOT_NO_RELAXED_ORDERING;
0965 
0966     pci_set_drvdata(pdev, hw);
0967 
0968     rv = csio_hw_start(hw);
0969     if (rv) {
0970         if (rv == -EINVAL) {
0971             dev_err(&pdev->dev,
0972                 "Failed to start FW, continuing in debug mode.\n");
0973             return 0;
0974         }
0975         goto err_lnode_exit;
0976     }
0977 
0978     sprintf(hw->fwrev_str, "%u.%u.%u.%u\n",
0979             FW_HDR_FW_VER_MAJOR_G(hw->fwrev),
0980             FW_HDR_FW_VER_MINOR_G(hw->fwrev),
0981             FW_HDR_FW_VER_MICRO_G(hw->fwrev),
0982             FW_HDR_FW_VER_BUILD_G(hw->fwrev));
0983 
0984     for (i = 0; i < hw->num_pports; i++) {
0985         ln = csio_shost_init(hw, &pdev->dev, true, NULL);
0986         if (!ln) {
0987             rv = -ENODEV;
0988             break;
0989         }
0990         /* Initialize portid */
0991         ln->portid = hw->pport[i].portid;
0992 
0993         spin_lock_irq(&hw->lock);
0994         if (csio_lnode_start(ln) != 0)
0995             rv = -ENODEV;
0996         spin_unlock_irq(&hw->lock);
0997 
0998         if (rv)
0999             break;
1000 
1001         csio_lnode_init_post(ln);
1002     }
1003 
1004     if (rv)
1005         goto err_lnode_exit;
1006 
1007     return 0;
1008 
1009 err_lnode_exit:
1010     csio_lnodes_block_request(hw);
1011     spin_lock_irq(&hw->lock);
1012     csio_hw_stop(hw);
1013     spin_unlock_irq(&hw->lock);
1014     csio_lnodes_unblock_request(hw);
1015     csio_lnodes_exit(hw, 0);
1016     csio_hw_free(hw);
1017 err_pci_exit:
1018     csio_pci_exit(pdev, &bars);
1019 err:
1020     dev_err(&pdev->dev, "probe of device failed: %d\n", rv);
1021     return rv;
1022 }
1023 
1024 /*
1025  * csio_remove_one - Remove one instance of the driver at this PCI function.
1026  * @pdev: PCI device
1027  *
1028  * Used during hotplug operation.
1029  */
1030 static void csio_remove_one(struct pci_dev *pdev)
1031 {
1032     struct csio_hw *hw = pci_get_drvdata(pdev);
1033     int bars = pci_select_bars(pdev, IORESOURCE_MEM);
1034 
1035     csio_lnodes_block_request(hw);
1036     spin_lock_irq(&hw->lock);
1037 
1038     /* Stops lnode, Rnode s/m
1039      * Quiesce IOs.
1040      * All sessions with remote ports are unregistered.
1041      */
1042     csio_hw_stop(hw);
1043     spin_unlock_irq(&hw->lock);
1044     csio_lnodes_unblock_request(hw);
1045 
1046     csio_lnodes_exit(hw, 0);
1047     csio_hw_free(hw);
1048     csio_pci_exit(pdev, &bars);
1049 }
1050 
1051 /*
1052  * csio_pci_error_detected - PCI error was detected
1053  * @pdev: PCI device
1054  *
1055  */
1056 static pci_ers_result_t
1057 csio_pci_error_detected(struct pci_dev *pdev, pci_channel_state_t state)
1058 {
1059     struct csio_hw *hw = pci_get_drvdata(pdev);
1060 
1061     csio_lnodes_block_request(hw);
1062     spin_lock_irq(&hw->lock);
1063 
1064     /* Post PCI error detected evt to HW s/m
1065      * HW s/m handles this evt by quiescing IOs, unregisters rports
1066      * and finally takes the device to offline.
1067      */
1068     csio_post_event(&hw->sm, CSIO_HWE_PCIERR_DETECTED);
1069     spin_unlock_irq(&hw->lock);
1070     csio_lnodes_unblock_request(hw);
1071     csio_lnodes_exit(hw, 0);
1072     csio_intr_disable(hw, true);
1073     pci_disable_device(pdev);
1074     return state == pci_channel_io_perm_failure ?
1075         PCI_ERS_RESULT_DISCONNECT : PCI_ERS_RESULT_NEED_RESET;
1076 }
1077 
1078 /*
1079  * csio_pci_slot_reset - PCI slot has been reset.
1080  * @pdev: PCI device
1081  *
1082  */
1083 static pci_ers_result_t
1084 csio_pci_slot_reset(struct pci_dev *pdev)
1085 {
1086     struct csio_hw *hw = pci_get_drvdata(pdev);
1087     int ready;
1088 
1089     if (pci_enable_device(pdev)) {
1090         dev_err(&pdev->dev, "cannot re-enable device in slot reset\n");
1091         return PCI_ERS_RESULT_DISCONNECT;
1092     }
1093 
1094     pci_set_master(pdev);
1095     pci_restore_state(pdev);
1096     pci_save_state(pdev);
1097 
1098     /* Bring HW s/m to ready state.
1099      * but don't resume IOs.
1100      */
1101     spin_lock_irq(&hw->lock);
1102     csio_post_event(&hw->sm, CSIO_HWE_PCIERR_SLOT_RESET);
1103     ready = csio_is_hw_ready(hw);
1104     spin_unlock_irq(&hw->lock);
1105 
1106     if (ready) {
1107         return PCI_ERS_RESULT_RECOVERED;
1108     } else {
1109         dev_err(&pdev->dev, "Can't initialize HW when in slot reset\n");
1110         return PCI_ERS_RESULT_DISCONNECT;
1111     }
1112 }
1113 
1114 /*
1115  * csio_pci_resume - Resume normal operations
1116  * @pdev: PCI device
1117  *
1118  */
1119 static void
1120 csio_pci_resume(struct pci_dev *pdev)
1121 {
1122     struct csio_hw *hw = pci_get_drvdata(pdev);
1123     struct csio_lnode *ln;
1124     int rv = 0;
1125     int i;
1126 
1127     /* Bring the LINK UP and Resume IO */
1128 
1129     for (i = 0; i < hw->num_pports; i++) {
1130         ln = csio_shost_init(hw, &pdev->dev, true, NULL);
1131         if (!ln) {
1132             rv = -ENODEV;
1133             break;
1134         }
1135         /* Initialize portid */
1136         ln->portid = hw->pport[i].portid;
1137 
1138         spin_lock_irq(&hw->lock);
1139         if (csio_lnode_start(ln) != 0)
1140             rv = -ENODEV;
1141         spin_unlock_irq(&hw->lock);
1142 
1143         if (rv)
1144             break;
1145 
1146         csio_lnode_init_post(ln);
1147     }
1148 
1149     if (rv)
1150         goto err_resume_exit;
1151 
1152     return;
1153 
1154 err_resume_exit:
1155     csio_lnodes_block_request(hw);
1156     spin_lock_irq(&hw->lock);
1157     csio_hw_stop(hw);
1158     spin_unlock_irq(&hw->lock);
1159     csio_lnodes_unblock_request(hw);
1160     csio_lnodes_exit(hw, 0);
1161     csio_hw_free(hw);
1162     dev_err(&pdev->dev, "resume of device failed: %d\n", rv);
1163 }
1164 
1165 static struct pci_error_handlers csio_err_handler = {
1166     .error_detected = csio_pci_error_detected,
1167     .slot_reset = csio_pci_slot_reset,
1168     .resume     = csio_pci_resume,
1169 };
1170 
1171 /*
1172  *  Macros needed to support the PCI Device ID Table ...
1173  */
1174 #define CH_PCI_DEVICE_ID_TABLE_DEFINE_BEGIN \
1175     static const struct pci_device_id csio_pci_tbl[] = {
1176 /* Define for FCoE uses PF6 */
1177 #define CH_PCI_DEVICE_ID_FUNCTION   0x6
1178 
1179 #define CH_PCI_ID_TABLE_ENTRY(devid) \
1180         { PCI_VDEVICE(CHELSIO, (devid)), 0 }
1181 
1182 #define CH_PCI_DEVICE_ID_TABLE_DEFINE_END { 0, } }
1183 
1184 #include "t4_pci_id_tbl.h"
1185 
1186 static struct pci_driver csio_pci_driver = {
1187     .name       = KBUILD_MODNAME,
1188     .driver     = {
1189         .owner  = THIS_MODULE,
1190     },
1191     .id_table   = csio_pci_tbl,
1192     .probe      = csio_probe_one,
1193     .remove     = csio_remove_one,
1194     .err_handler    = &csio_err_handler,
1195 };
1196 
1197 /*
1198  * csio_init - Chelsio storage driver initialization function.
1199  *
1200  */
1201 static int __init
1202 csio_init(void)
1203 {
1204     int rv = -ENOMEM;
1205 
1206     pr_info("%s %s\n", CSIO_DRV_DESC, CSIO_DRV_VERSION);
1207 
1208     csio_dfs_init();
1209 
1210     csio_fcoe_transport = fc_attach_transport(&csio_fc_transport_funcs);
1211     if (!csio_fcoe_transport)
1212         goto err;
1213 
1214     csio_fcoe_transport_vport =
1215             fc_attach_transport(&csio_fc_transport_vport_funcs);
1216     if (!csio_fcoe_transport_vport)
1217         goto err_vport;
1218 
1219     rv = pci_register_driver(&csio_pci_driver);
1220     if (rv)
1221         goto err_pci;
1222 
1223     return 0;
1224 
1225 err_pci:
1226     fc_release_transport(csio_fcoe_transport_vport);
1227 err_vport:
1228     fc_release_transport(csio_fcoe_transport);
1229 err:
1230     csio_dfs_exit();
1231     return rv;
1232 }
1233 
1234 /*
1235  * csio_exit - Chelsio storage driver uninitialization .
1236  *
1237  * Function that gets called in the unload path.
1238  */
1239 static void __exit
1240 csio_exit(void)
1241 {
1242     pci_unregister_driver(&csio_pci_driver);
1243     csio_dfs_exit();
1244     fc_release_transport(csio_fcoe_transport_vport);
1245     fc_release_transport(csio_fcoe_transport);
1246 }
1247 
1248 module_init(csio_init);
1249 module_exit(csio_exit);
1250 MODULE_AUTHOR(CSIO_DRV_AUTHOR);
1251 MODULE_DESCRIPTION(CSIO_DRV_DESC);
1252 MODULE_LICENSE("Dual BSD/GPL");
1253 MODULE_DEVICE_TABLE(pci, csio_pci_tbl);
1254 MODULE_VERSION(CSIO_DRV_VERSION);
1255 MODULE_FIRMWARE(FW_FNAME_T5);
1256 MODULE_FIRMWARE(FW_FNAME_T6);
1257 MODULE_SOFTDEP("pre: cxgb4");
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