linux/drivers/infiniband/hw/hfi1/msix.c
Michael J. Ruhl a2f7bbdc2d IB/hfi1: Rework the IRQ API to be more flexible
The current IRQ API is an all or nothing interface.  This has two
problems:

  1. All IRQs are enabled regardless of use
  2. Moving from general interrupt to MSIx handling is difficult

Introduce a new API to enable/disable specific IRQs or a range of IRQs.

Do not enable and disable all IRQs in one step.

Rework various modules to enable/disable IRQs when needed.

Reviewed-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Reviewed-by: Sadanand Warrier <sadanand.warrier@intel.com>
Signed-off-by: Michael J. Ruhl <michael.j.ruhl@intel.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
2018-09-01 08:13:38 -04:00

364 lines
9.6 KiB
C

// SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
/*
* Copyright(c) 2018 Intel Corporation.
*
* This file is provided under a dual BSD/GPLv2 license. When using or
* redistributing this file, you may do so under either license.
*
* GPL LICENSE SUMMARY
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* BSD LICENSE
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
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* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#include "hfi.h"
#include "affinity.h"
#include "sdma.h"
/**
* msix_initialize() - Calculate, request and configure MSIx IRQs
* @dd: valid hfi1 devdata
*
*/
int msix_initialize(struct hfi1_devdata *dd)
{
u32 total;
int ret;
struct hfi1_msix_entry *entries;
/*
* MSIx interrupt count:
* one for the general, "slow path" interrupt
* one per used SDMA engine
* one per kernel receive context
* one for each VNIC context
* ...any new IRQs should be added here.
*/
total = 1 + dd->num_sdma + dd->n_krcv_queues + dd->num_vnic_contexts;
if (total >= CCE_NUM_MSIX_VECTORS)
return -EINVAL;
ret = pci_alloc_irq_vectors(dd->pcidev, total, total, PCI_IRQ_MSIX);
if (ret < 0) {
dd_dev_err(dd, "pci_alloc_irq_vectors() failed: %d\n", ret);
return ret;
}
entries = kcalloc(total, sizeof(*dd->msix_info.msix_entries),
GFP_KERNEL);
if (!entries) {
pci_free_irq_vectors(dd->pcidev);
return -ENOMEM;
}
dd->msix_info.msix_entries = entries;
spin_lock_init(&dd->msix_info.msix_lock);
bitmap_zero(dd->msix_info.in_use_msix, total);
dd->msix_info.max_requested = total;
dd_dev_info(dd, "%u MSI-X interrupts allocated\n", total);
return 0;
}
/**
* msix_request_irq() - Allocate a free MSIx IRQ
* @dd: valid devdata
* @arg: context information for the IRQ
* @handler: IRQ handler
* @thread: IRQ thread handler (could be NULL)
* @idx: zero base idx if multiple devices are needed
* @type: affinty IRQ type
*
* Allocated an MSIx vector if available, and then create the appropriate
* meta data needed to keep track of the pci IRQ request.
*
* Return:
* < 0 Error
* >= 0 MSIx vector
*
*/
static int msix_request_irq(struct hfi1_devdata *dd, void *arg,
irq_handler_t handler, irq_handler_t thread,
u32 idx, enum irq_type type)
{
unsigned long nr;
int irq;
int ret;
const char *err_info;
char name[MAX_NAME_SIZE];
struct hfi1_msix_entry *me;
/* Allocate an MSIx vector */
spin_lock(&dd->msix_info.msix_lock);
nr = find_first_zero_bit(dd->msix_info.in_use_msix,
dd->msix_info.max_requested);
if (nr < dd->msix_info.max_requested)
__set_bit(nr, dd->msix_info.in_use_msix);
spin_unlock(&dd->msix_info.msix_lock);
if (nr == dd->msix_info.max_requested)
return -ENOSPC;
/* Specific verification and determine the name */
switch (type) {
case IRQ_GENERAL:
/* general interrupt must be MSIx vector 0 */
if (nr) {
spin_lock(&dd->msix_info.msix_lock);
__clear_bit(nr, dd->msix_info.in_use_msix);
spin_unlock(&dd->msix_info.msix_lock);
dd_dev_err(dd, "Invalid index %lu for GENERAL IRQ\n",
nr);
return -EINVAL;
}
snprintf(name, sizeof(name), DRIVER_NAME "_%d", dd->unit);
err_info = "general";
break;
case IRQ_SDMA:
snprintf(name, sizeof(name), DRIVER_NAME "_%d sdma%d",
dd->unit, idx);
err_info = "sdma";
break;
case IRQ_RCVCTXT:
snprintf(name, sizeof(name), DRIVER_NAME "_%d kctxt%d",
dd->unit, idx);
err_info = "receive context";
break;
case IRQ_OTHER:
default:
return -EINVAL;
}
name[sizeof(name) - 1] = 0;
irq = pci_irq_vector(dd->pcidev, nr);
ret = pci_request_irq(dd->pcidev, nr, handler, thread, arg, name);
if (ret) {
dd_dev_err(dd,
"%s: request for IRQ %d failed, MSIx %d, err %d\n",
err_info, irq, idx, ret);
spin_lock(&dd->msix_info.msix_lock);
__clear_bit(nr, dd->msix_info.in_use_msix);
spin_unlock(&dd->msix_info.msix_lock);
return ret;
}
/*
* assign arg after pci_request_irq call, so it will be
* cleaned up
*/
me = &dd->msix_info.msix_entries[nr];
me->irq = irq;
me->arg = arg;
me->type = type;
/* This is a request, so a failure is not fatal */
ret = hfi1_get_irq_affinity(dd, me);
if (ret)
dd_dev_err(dd, "unable to pin IRQ %d\n", ret);
return nr;
}
/**
* msix_request_rcd_irq() - Helper function for RCVAVAIL IRQs
* @rcd: valid rcd context
*
*/
int msix_request_rcd_irq(struct hfi1_ctxtdata *rcd)
{
int nr;
nr = msix_request_irq(rcd->dd, rcd, receive_context_interrupt,
receive_context_thread, rcd->ctxt, IRQ_RCVCTXT);
if (nr < 0)
return nr;
/*
* Set the interrupt register and mask for this
* context's interrupt.
*/
rcd->ireg = (IS_RCVAVAIL_START + rcd->ctxt) / 64;
rcd->imask = ((u64)1) << ((IS_RCVAVAIL_START + rcd->ctxt) % 64);
rcd->msix_intr = nr;
remap_intr(rcd->dd, IS_RCVAVAIL_START + rcd->ctxt, nr);
return 0;
}
/**
* msix_request_smda_ira() - Helper for getting SDMA IRQ resources
* @sde: valid sdma engine
*
*/
int msix_request_sdma_irq(struct sdma_engine *sde)
{
int nr;
nr = msix_request_irq(sde->dd, sde, sdma_interrupt, NULL,
sde->this_idx, IRQ_SDMA);
if (nr < 0)
return nr;
sde->msix_intr = nr;
remap_sdma_interrupts(sde->dd, sde->this_idx, nr);
return 0;
}
/**
* enable_sdma_src() - Helper to enable SDMA IRQ srcs
* @dd: valid devdata structure
* @i: index of SDMA engine
*/
static void enable_sdma_srcs(struct hfi1_devdata *dd, int i)
{
set_intr_bits(dd, IS_SDMA_START + i, IS_SDMA_START + i, true);
set_intr_bits(dd, IS_SDMA_PROGRESS_START + i,
IS_SDMA_PROGRESS_START + i, true);
set_intr_bits(dd, IS_SDMA_IDLE_START + i, IS_SDMA_IDLE_START + i, true);
set_intr_bits(dd, IS_SDMAENG_ERR_START + i, IS_SDMAENG_ERR_START + i,
true);
}
/**
* msix_request_irqs() - Allocate all MSIx IRQs
* @dd: valid devdata structure
*
* Helper function to request the used MSIx IRQs.
*
*/
int msix_request_irqs(struct hfi1_devdata *dd)
{
int i;
int ret;
ret = msix_request_irq(dd, dd, general_interrupt, NULL, 0, IRQ_GENERAL);
if (ret < 0)
return ret;
for (i = 0; i < dd->num_sdma; i++) {
struct sdma_engine *sde = &dd->per_sdma[i];
ret = msix_request_sdma_irq(sde);
if (ret)
return ret;
enable_sdma_srcs(sde->dd, i);
}
for (i = 0; i < dd->n_krcv_queues; i++) {
struct hfi1_ctxtdata *rcd = hfi1_rcd_get_by_index_safe(dd, i);
if (rcd)
ret = msix_request_rcd_irq(rcd);
hfi1_rcd_put(rcd);
if (ret)
return ret;
}
return 0;
}
/**
* msix_free_irq() - Free the specified MSIx resources and IRQ
* @dd: valid devdata
* @msix_intr: MSIx vector to free.
*
*/
void msix_free_irq(struct hfi1_devdata *dd, u8 msix_intr)
{
struct hfi1_msix_entry *me;
if (msix_intr >= dd->msix_info.max_requested)
return;
me = &dd->msix_info.msix_entries[msix_intr];
if (!me->arg) /* => no irq, no affinity */
return;
hfi1_put_irq_affinity(dd, me);
pci_free_irq(dd->pcidev, msix_intr, me->arg);
me->arg = NULL;
spin_lock(&dd->msix_info.msix_lock);
__clear_bit(msix_intr, dd->msix_info.in_use_msix);
spin_unlock(&dd->msix_info.msix_lock);
}
/**
* hfi1_clean_up_msix_interrupts() - Free all MSIx IRQ resources
* @dd: valid device data data structure
*
* Free the MSIx and associated PCI resources, if they have been allocated.
*/
void msix_clean_up_interrupts(struct hfi1_devdata *dd)
{
int i;
struct hfi1_msix_entry *me = dd->msix_info.msix_entries;
/* remove irqs - must happen before disabling/turning off */
for (i = 0; i < dd->msix_info.max_requested; i++, me++)
msix_free_irq(dd, i);
/* clean structures */
kfree(dd->msix_info.msix_entries);
dd->msix_info.msix_entries = NULL;
dd->msix_info.max_requested = 0;
pci_free_irq_vectors(dd->pcidev);
}
/**
* msix_vnic_syncrhonize_irq() - Vnic IRQ synchronize
* @dd: valid devdata
*/
void msix_vnic_synchronize_irq(struct hfi1_devdata *dd)
{
int i;
for (i = 0; i < dd->vnic.num_ctxt; i++) {
struct hfi1_ctxtdata *rcd = dd->vnic.ctxt[i];
struct hfi1_msix_entry *me;
me = &dd->msix_info.msix_entries[rcd->msix_intr];
synchronize_irq(me->irq);
}
}