cregit-Linux how code gets into the kernel

Release 4.11 drivers/scsi/csiostor/csio_isr.c

/*
 * 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.
 */

#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/interrupt.h>
#include <linux/cpumask.h>
#include <linux/string.h>

#include "csio_init.h"
#include "csio_hw.h"


static irqreturn_t csio_nondata_isr(int irq, void *dev_id) { struct csio_hw *hw = (struct csio_hw *) dev_id; int rv; unsigned long flags; if (unlikely(!hw)) return IRQ_NONE; if (unlikely(pci_channel_offline(hw->pdev))) { CSIO_INC_STATS(hw, n_pcich_offline); return IRQ_NONE; } spin_lock_irqsave(&hw->lock, flags); csio_hw_slow_intr_handler(hw); rv = csio_mb_isr_handler(hw); if (rv == 0 && !(hw->flags & CSIO_HWF_FWEVT_PENDING)) { hw->flags |= CSIO_HWF_FWEVT_PENDING; spin_unlock_irqrestore(&hw->lock, flags); schedule_work(&hw->evtq_work); return IRQ_HANDLED; } spin_unlock_irqrestore(&hw->lock, flags); return IRQ_HANDLED; }

Contributors

PersonTokensPropCommitsCommitProp
Naresh Kumar Inna146100.00%1100.00%
Total146100.00%1100.00%

/* * csio_fwevt_handler - Common FW event handler routine. * @hw: HW module. * * This is the ISR for FW events. It is shared b/w MSIX * and INTx handlers. */
static void csio_fwevt_handler(struct csio_hw *hw) { int rv; unsigned long flags; rv = csio_fwevtq_handler(hw); spin_lock_irqsave(&hw->lock, flags); if (rv == 0 && !(hw->flags & CSIO_HWF_FWEVT_PENDING)) { hw->flags |= CSIO_HWF_FWEVT_PENDING; spin_unlock_irqrestore(&hw->lock, flags); schedule_work(&hw->evtq_work); return; } spin_unlock_irqrestore(&hw->lock, flags); }

Contributors

PersonTokensPropCommitsCommitProp
Naresh Kumar Inna87100.00%1100.00%
Total87100.00%1100.00%

/* csio_fwevt_handler */ /* * csio_fwevt_isr() - FW events MSIX ISR * @irq: * @dev_id: * * Process WRs on the FW event queue. * */
static irqreturn_t csio_fwevt_isr(int irq, void *dev_id) { struct csio_hw *hw = (struct csio_hw *) dev_id; if (unlikely(!hw)) return IRQ_NONE; if (unlikely(pci_channel_offline(hw->pdev))) { CSIO_INC_STATS(hw, n_pcich_offline); return IRQ_NONE; } csio_fwevt_handler(hw); return IRQ_HANDLED; }

Contributors

PersonTokensPropCommitsCommitProp
Naresh Kumar Inna68100.00%1100.00%
Total68100.00%1100.00%

/* * csio_fwevt_isr() - INTx wrapper for handling FW events. * @irq: * @dev_id: */
void csio_fwevt_intx_handler(struct csio_hw *hw, void *wr, uint32_t len, struct csio_fl_dma_buf *flb, void *priv) { csio_fwevt_handler(hw); }

Contributors

PersonTokensPropCommitsCommitProp
Naresh Kumar Inna31100.00%1100.00%
Total31100.00%1100.00%

/* csio_fwevt_intx_handler */ /* * csio_process_scsi_cmpl - Process a SCSI WR completion. * @hw: HW module. * @wr: The completed WR from the ingress queue. * @len: Length of the WR. * @flb: Freelist buffer array. * */
static void csio_process_scsi_cmpl(struct csio_hw *hw, void *wr, uint32_t len, struct csio_fl_dma_buf *flb, void *cbfn_q) { struct csio_ioreq *ioreq; uint8_t *scsiwr; uint8_t subop; void *cmnd; unsigned long flags; ioreq = csio_scsi_cmpl_handler(hw, wr, len, flb, NULL, &scsiwr); if (likely(ioreq)) { if (unlikely(*scsiwr == FW_SCSI_ABRT_CLS_WR)) { subop = FW_SCSI_ABRT_CLS_WR_SUB_OPCODE_GET( ((struct fw_scsi_abrt_cls_wr *) scsiwr)->sub_opcode_to_chk_all_io); csio_dbg(hw, "%s cmpl recvd ioreq:%p status:%d\n", subop ? "Close" : "Abort", ioreq, ioreq->wr_status); spin_lock_irqsave(&hw->lock, flags); if (subop) csio_scsi_closed(ioreq, (struct list_head *)cbfn_q); else csio_scsi_aborted(ioreq, (struct list_head *)cbfn_q); /* * We call scsi_done for I/Os that driver thinks aborts * have timed out. If there is a race caused by FW * completing abort at the exact same time that the * driver has deteced the abort timeout, the following * check prevents calling of scsi_done twice for the * same command: once from the eh_abort_handler, another * from csio_scsi_isr_handler(). This also avoids the * need to check if csio_scsi_cmnd(req) is NULL in the * fast path. */ cmnd = csio_scsi_cmnd(ioreq); if (unlikely(cmnd == NULL)) list_del_init(&ioreq->sm.sm_list); spin_unlock_irqrestore(&hw->lock, flags); if (unlikely(cmnd == NULL)) csio_put_scsi_ioreq_lock(hw, csio_hw_to_scsim(hw), ioreq); } else { spin_lock_irqsave(&hw->lock, flags); csio_scsi_completed(ioreq, (struct list_head *)cbfn_q); spin_unlock_irqrestore(&hw->lock, flags); } } }

Contributors

PersonTokensPropCommitsCommitProp
Naresh Kumar Inna253100.00%1100.00%
Total253100.00%1100.00%

/* * csio_scsi_isr_handler() - Common SCSI ISR handler. * @iq: Ingress queue pointer. * * Processes SCSI completions on the SCSI IQ indicated by scm->iq_idx * by calling csio_wr_process_iq_idx. If there are completions on the * isr_cbfn_q, yank them out into a local queue and call their io_cbfns. * Once done, add these completions onto the freelist. * This routine is shared b/w MSIX and INTx. */
static inline irqreturn_t csio_scsi_isr_handler(struct csio_q *iq) { struct csio_hw *hw = (struct csio_hw *)iq->owner; LIST_HEAD(cbfn_q); struct list_head *tmp; struct csio_scsim *scm; struct csio_ioreq *ioreq; int isr_completions = 0; scm = csio_hw_to_scsim(hw); if (unlikely(csio_wr_process_iq(hw, iq, csio_process_scsi_cmpl, &cbfn_q) != 0)) return IRQ_NONE; /* Call back the completion routines */ list_for_each(tmp, &cbfn_q) { ioreq = (struct csio_ioreq *)tmp; isr_completions++; ioreq->io_cbfn(hw, ioreq); /* Release ddp buffer if used for this req */ if (unlikely(ioreq->dcopy)) csio_put_scsi_ddp_list_lock(hw, scm, &ioreq->gen_list, ioreq->nsge); } if (isr_completions) { /* Return the ioreqs back to ioreq->freelist */ csio_put_scsi_ioreq_list_lock(hw, scm, &cbfn_q, isr_completions); } return IRQ_HANDLED; }

Contributors

PersonTokensPropCommitsCommitProp
Naresh Kumar Inna158100.00%1100.00%
Total158100.00%1100.00%

/* * csio_scsi_isr() - SCSI MSIX handler * @irq: * @dev_id: * * This is the top level SCSI MSIX handler. Calls csio_scsi_isr_handler() * for handling SCSI completions. */
static irqreturn_t csio_scsi_isr(int irq, void *dev_id) { struct csio_q *iq = (struct csio_q *) dev_id; struct csio_hw *hw; if (unlikely(!iq)) return IRQ_NONE; hw = (struct csio_hw *)iq->owner; if (unlikely(pci_channel_offline(hw->pdev))) { CSIO_INC_STATS(hw, n_pcich_offline); return IRQ_NONE; } csio_scsi_isr_handler(iq); return IRQ_HANDLED; }

Contributors

PersonTokensPropCommitsCommitProp
Naresh Kumar Inna84100.00%1100.00%
Total84100.00%1100.00%

/* * csio_scsi_intx_handler() - SCSI INTx handler * @irq: * @dev_id: * * This is the top level SCSI INTx handler. Calls csio_scsi_isr_handler() * for handling SCSI completions. */
void csio_scsi_intx_handler(struct csio_hw *hw, void *wr, uint32_t len, struct csio_fl_dma_buf *flb, void *priv) { struct csio_q *iq = priv; csio_scsi_isr_handler(iq); }

Contributors

PersonTokensPropCommitsCommitProp
Naresh Kumar Inna38100.00%1100.00%
Total38100.00%1100.00%

/* csio_scsi_intx_handler */ /* * csio_fcoe_isr() - INTx/MSI interrupt service routine for FCoE. * @irq: * @dev_id: * * */
static irqreturn_t csio_fcoe_isr(int irq, void *dev_id) { struct csio_hw *hw = (struct csio_hw *) dev_id; struct csio_q *intx_q = NULL; int rv; irqreturn_t ret = IRQ_NONE; unsigned long flags; if (unlikely(!hw)) return IRQ_NONE; if (unlikely(pci_channel_offline(hw->pdev))) { CSIO_INC_STATS(hw, n_pcich_offline); return IRQ_NONE; } /* Disable the interrupt for this PCI function. */ if (hw->intr_mode == CSIO_IM_INTX) csio_wr_reg32(hw, 0, MYPF_REG(PCIE_PF_CLI_A)); /* * The read in the following function will flush the * above write. */ if (csio_hw_slow_intr_handler(hw)) ret = IRQ_HANDLED; /* Get the INTx Forward interrupt IQ. */ intx_q = csio_get_q(hw, hw->intr_iq_idx); CSIO_DB_ASSERT(intx_q); /* IQ handler is not possible for intx_q, hence pass in NULL */ if (likely(csio_wr_process_iq(hw, intx_q, NULL, NULL) == 0)) ret = IRQ_HANDLED; spin_lock_irqsave(&hw->lock, flags); rv = csio_mb_isr_handler(hw); if (rv == 0 && !(hw->flags & CSIO_HWF_FWEVT_PENDING)) { hw->flags |= CSIO_HWF_FWEVT_PENDING; spin_unlock_irqrestore(&hw->lock, flags); schedule_work(&hw->evtq_work); return IRQ_HANDLED; } spin_unlock_irqrestore(&hw->lock, flags); return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Naresh Kumar Inna22599.56%150.00%
Hariprasad Shenai10.44%150.00%
Total226100.00%2100.00%


static void csio_add_msix_desc(struct csio_hw *hw) { int i; struct csio_msix_entries *entryp = &hw->msix_entries[0]; int k = CSIO_EXTRA_VECS; int len = sizeof(entryp->desc) - 1; int cnt = hw->num_sqsets + k; /* Non-data vector */ memset(entryp->desc, 0, len + 1); snprintf(entryp->desc, len, "csio-%02x:%02x:%x-nondata", CSIO_PCI_BUS(hw), CSIO_PCI_DEV(hw), CSIO_PCI_FUNC(hw)); entryp++; memset(entryp->desc, 0, len + 1); snprintf(entryp->desc, len, "csio-%02x:%02x:%x-fwevt", CSIO_PCI_BUS(hw), CSIO_PCI_DEV(hw), CSIO_PCI_FUNC(hw)); entryp++; /* Name SCSI vecs */ for (i = k; i < cnt; i++, entryp++) { memset(entryp->desc, 0, len + 1); snprintf(entryp->desc, len, "csio-%02x:%02x:%x-scsi%d", CSIO_PCI_BUS(hw), CSIO_PCI_DEV(hw), CSIO_PCI_FUNC(hw), i - CSIO_EXTRA_VECS); } }

Contributors

PersonTokensPropCommitsCommitProp
Naresh Kumar Inna200100.00%1100.00%
Total200100.00%1100.00%


int csio_request_irqs(struct csio_hw *hw) { int rv, i, j, k = 0; struct csio_msix_entries *entryp = &hw->msix_entries[0]; struct csio_scsi_cpu_info *info; if (hw->intr_mode != CSIO_IM_MSIX) { rv = request_irq(hw->pdev->irq, csio_fcoe_isr, (hw->intr_mode == CSIO_IM_MSI) ? 0 : IRQF_SHARED, KBUILD_MODNAME, hw); if (rv) { if (hw->intr_mode == CSIO_IM_MSI) pci_disable_msi(hw->pdev); csio_err(hw, "Failed to allocate interrupt line.\n"); return -EINVAL; } goto out; } /* Add the MSIX vector descriptions */ csio_add_msix_desc(hw); rv = request_irq(entryp[k].vector, csio_nondata_isr, 0, entryp[k].desc, hw); if (rv) { csio_err(hw, "IRQ request failed for vec %d err:%d\n", entryp[k].vector, rv); goto err; } entryp[k++].dev_id = (void *)hw; rv = request_irq(entryp[k].vector, csio_fwevt_isr, 0, entryp[k].desc, hw); if (rv) { csio_err(hw, "IRQ request failed for vec %d err:%d\n", entryp[k].vector, rv); goto err; } entryp[k++].dev_id = (void *)hw; /* Allocate IRQs for SCSI */ for (i = 0; i < hw->num_pports; i++) { info = &hw->scsi_cpu_info[i]; for (j = 0; j < info->max_cpus; j++, k++) { struct csio_scsi_qset *sqset = &hw->sqset[i][j]; struct csio_q *q = hw->wrm.q_arr[sqset->iq_idx]; rv = request_irq(entryp[k].vector, csio_scsi_isr, 0, entryp[k].desc, q); if (rv) { csio_err(hw, "IRQ request failed for vec %d err:%d\n", entryp[k].vector, rv); goto err; } entryp[k].dev_id = (void *)q; } /* for all scsi cpus */ } /* for all ports */ out: hw->flags |= CSIO_HWF_HOST_INTR_ENABLED; return 0; err: for (i = 0; i < k; i++) { entryp = &hw->msix_entries[i]; free_irq(entryp->vector, entryp->dev_id); } pci_disable_msix(hw->pdev); return -EINVAL; }

Contributors

PersonTokensPropCommitsCommitProp
Naresh Kumar Inna452100.00%1100.00%
Total452100.00%1100.00%


static void csio_disable_msix(struct csio_hw *hw, bool free) { int i; struct csio_msix_entries *entryp; int cnt = hw->num_sqsets + CSIO_EXTRA_VECS; if (free) { for (i = 0; i < cnt; i++) { entryp = &hw->msix_entries[i]; free_irq(entryp->vector, entryp->dev_id); } } pci_disable_msix(hw->pdev); }

Contributors

PersonTokensPropCommitsCommitProp
Naresh Kumar Inna80100.00%1100.00%
Total80100.00%1100.00%

/* Reduce per-port max possible CPUs */
static void csio_reduce_sqsets(struct csio_hw *hw, int cnt) { int i; struct csio_scsi_cpu_info *info; while (cnt < hw->num_sqsets) { for (i = 0; i < hw->num_pports; i++) { info = &hw->scsi_cpu_info[i]; if (info->max_cpus > 1) { info->max_cpus--; hw->num_sqsets--; if (hw->num_sqsets <= cnt) break; } } } csio_dbg(hw, "Reduced sqsets to %d\n", hw->num_sqsets); }

Contributors

PersonTokensPropCommitsCommitProp
Naresh Kumar Inna99100.00%1100.00%
Total99100.00%1100.00%


static int csio_enable_msix(struct csio_hw *hw) { int i, j, k, n, min, cnt; struct csio_msix_entries *entryp; struct msix_entry *entries; int extra = CSIO_EXTRA_VECS; struct csio_scsi_cpu_info *info; min = hw->num_pports + extra; cnt = hw->num_sqsets + extra; /* Max vectors required based on #niqs configured in fw */ if (hw->flags & CSIO_HWF_USING_SOFT_PARAMS || !csio_is_hw_master(hw)) cnt = min_t(uint8_t, hw->cfg_niq, cnt); entries = kzalloc(sizeof(struct msix_entry) * cnt, GFP_KERNEL); if (!entries) return -ENOMEM; for (i = 0; i < cnt; i++) entries[i].entry = (uint16_t)i; csio_dbg(hw, "FW supp #niq:%d, trying %d msix's\n", hw->cfg_niq, cnt); cnt = pci_enable_msix_range(hw->pdev, entries, min, cnt); if (cnt < 0) { kfree(entries); return cnt; } if (cnt < (hw->num_sqsets + extra)) { csio_dbg(hw, "Reducing sqsets to %d\n", cnt - extra); csio_reduce_sqsets(hw, cnt - extra); } /* Save off vectors */ for (i = 0; i < cnt; i++) { entryp = &hw->msix_entries[i]; entryp->vector = entries[i].vector; } /* Distribute vectors */ k = 0; csio_set_nondata_intr_idx(hw, entries[k].entry); csio_set_mb_intr_idx(csio_hw_to_mbm(hw), entries[k++].entry); csio_set_fwevt_intr_idx(hw, entries[k++].entry); for (i = 0; i < hw->num_pports; i++) { info = &hw->scsi_cpu_info[i]; for (j = 0; j < hw->num_scsi_msix_cpus; j++) { n = (j % info->max_cpus) + k; hw->sqset[i][j].intr_idx = entries[n].entry; } k += info->max_cpus; } kfree(entries); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Naresh Kumar Inna37195.87%150.00%
Alexander Gordeev164.13%150.00%
Total387100.00%2100.00%


void csio_intr_enable(struct csio_hw *hw) { hw->intr_mode = CSIO_IM_NONE; hw->flags &= ~CSIO_HWF_HOST_INTR_ENABLED; /* Try MSIX, then MSI or fall back to INTx */ if ((csio_msi == 2) && !csio_enable_msix(hw)) hw->intr_mode = CSIO_IM_MSIX; else { /* Max iqs required based on #niqs configured in fw */ if (hw->flags & CSIO_HWF_USING_SOFT_PARAMS || !csio_is_hw_master(hw)) { int extra = CSIO_EXTRA_MSI_IQS; if (hw->cfg_niq < (hw->num_sqsets + extra)) { csio_dbg(hw, "Reducing sqsets to %d\n", hw->cfg_niq - extra); csio_reduce_sqsets(hw, hw->cfg_niq - extra); } } if ((csio_msi == 1) && !pci_enable_msi(hw->pdev)) hw->intr_mode = CSIO_IM_MSI; else hw->intr_mode = CSIO_IM_INTX; } csio_dbg(hw, "Using %s interrupt mode.\n", (hw->intr_mode == CSIO_IM_MSIX) ? "MSIX" : ((hw->intr_mode == CSIO_IM_MSI) ? "MSI" : "INTx")); }

Contributors

PersonTokensPropCommitsCommitProp
Naresh Kumar Inna169100.00%1100.00%
Total169100.00%1100.00%


void csio_intr_disable(struct csio_hw *hw, bool free) { csio_hw_intr_disable(hw); switch (hw->intr_mode) { case CSIO_IM_MSIX: csio_disable_msix(hw, free); break; case CSIO_IM_MSI: if (free) free_irq(hw->pdev->irq, hw); pci_disable_msi(hw->pdev); break; case CSIO_IM_INTX: if (free) free_irq(hw->pdev->irq, hw); break; default: break; } hw->intr_mode = CSIO_IM_NONE; hw->flags &= ~CSIO_HWF_HOST_INTR_ENABLED; }

Contributors

PersonTokensPropCommitsCommitProp
Naresh Kumar Inna97100.00%1100.00%
Total97100.00%1100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
Naresh Kumar Inna259299.35%133.33%
Alexander Gordeev160.61%133.33%
Hariprasad Shenai10.04%133.33%
Total2609100.00%3100.00%
Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
Created with cregit.