/*
* 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;
}
/*
* 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);
} /* 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;
}
/*
* 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);
} /* 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);
}
}
}
/*
* 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;
}
/*
* 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;
}
/*
* 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);
} /* 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));
/*
* 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;
}
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);
}
}
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;
}
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);
}
/* 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);
}
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;
}
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"));
}
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;
}
