d63730192f
Kernel receive queues oversubscribe CPU cores on multi-HFI systems. To prevent this, the kernel receive queues are separated onto different cores, and the SDMA engine interrupts are constrained to a lesser number of cores. hfi1s_on_numa_node*krcvqs is the number of CPU cores that are reserved for kernel receive queues for all HFIs. Each HFI initializes its kernel receive queues to one of the reserved CPU cores. If there ends up being 0 CPU cores leftover for SDMA engines, use the same CPU cores as receive contexts. In addition, general and control contexts are assigned to their own CPU core, however, both types of contexts tend to have low traffic. To save CPU cores, collapse general and control contexts to one CPU core for all HFI units. This change prevents SDMA engine interrupts from wrapping around general contexts. Reviewed-by: Dean Luick <dean.luick@intel.com> Signed-off-by: Sebastian Sanchez <sebastian.sanchez@intel.com> Signed-off-by: Doug Ledford <dledford@redhat.com>
127 lines
4.0 KiB
C
127 lines
4.0 KiB
C
/*
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* Copyright(c) 2015, 2016 Intel Corporation.
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*
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* This file is provided under a dual BSD/GPLv2 license. When using or
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* redistributing this file, you may do so under either license.
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*
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* GPL LICENSE SUMMARY
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of version 2 of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* BSD LICENSE
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* - Neither the name of Intel Corporation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#ifndef _HFI1_AFFINITY_H
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#define _HFI1_AFFINITY_H
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#include "hfi.h"
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enum irq_type {
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IRQ_SDMA,
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IRQ_RCVCTXT,
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IRQ_GENERAL,
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IRQ_OTHER
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};
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/* Can be used for both memory and cpu */
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enum affinity_flags {
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AFF_AUTO,
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AFF_NUMA_LOCAL,
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AFF_DEV_LOCAL,
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AFF_IRQ_LOCAL
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};
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struct cpu_mask_set {
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struct cpumask mask;
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struct cpumask used;
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uint gen;
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};
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struct hfi1_affinity {
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struct cpu_mask_set def_intr;
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struct cpu_mask_set rcv_intr;
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struct cpu_mask_set proc;
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struct cpumask real_cpu_mask;
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/* spin lock to protect affinity struct */
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spinlock_t lock;
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};
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struct hfi1_msix_entry;
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/* Initialize non-HT cpu cores mask */
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void init_real_cpu_mask(void);
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/* Initialize driver affinity data */
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int hfi1_dev_affinity_init(struct hfi1_devdata *);
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/*
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* Set IRQ affinity to a CPU. The function will determine the
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* CPU and set the affinity to it.
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*/
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int hfi1_get_irq_affinity(struct hfi1_devdata *, struct hfi1_msix_entry *);
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/*
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* Remove the IRQ's CPU affinity. This function also updates
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* any internal CPU tracking data
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*/
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void hfi1_put_irq_affinity(struct hfi1_devdata *, struct hfi1_msix_entry *);
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/*
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* Determine a CPU affinity for a user process, if the process does not
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* have an affinity set yet.
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*/
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int hfi1_get_proc_affinity(struct hfi1_devdata *, int);
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/* Release a CPU used by a user process. */
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void hfi1_put_proc_affinity(struct hfi1_devdata *, int);
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struct hfi1_affinity_node {
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int node;
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struct cpu_mask_set def_intr;
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struct cpu_mask_set rcv_intr;
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struct cpumask general_intr_mask;
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struct list_head list;
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};
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struct hfi1_affinity_node_list {
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struct list_head list;
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struct cpumask real_cpu_mask;
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struct cpu_mask_set proc;
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/* protect affinity node list */
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spinlock_t lock;
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};
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int node_affinity_init(void);
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void node_affinity_destroy(void);
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extern struct hfi1_affinity_node_list node_affinity;
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#endif /* _HFI1_AFFINITY_H */
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