349 lines
8.1 KiB
C
349 lines
8.1 KiB
C
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// SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
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/*
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* Copyright(c) 2018 - 2020 Intel Corporation.
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*/
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#include "hfi.h"
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#include "affinity.h"
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#include "sdma.h"
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#include "netdev.h"
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/**
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* msix_initialize() - Calculate, request and configure MSIx IRQs
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* @dd: valid hfi1 devdata
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*
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*/
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int msix_initialize(struct hfi1_devdata *dd)
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{
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u32 total;
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int ret;
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struct hfi1_msix_entry *entries;
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/*
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* MSIx interrupt count:
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* one for the general, "slow path" interrupt
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* one per used SDMA engine
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* one per kernel receive context
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* one for each VNIC context
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* ...any new IRQs should be added here.
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*/
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total = 1 + dd->num_sdma + dd->n_krcv_queues + dd->num_netdev_contexts;
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if (total >= CCE_NUM_MSIX_VECTORS)
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return -EINVAL;
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ret = pci_alloc_irq_vectors(dd->pcidev, total, total, PCI_IRQ_MSIX);
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if (ret < 0) {
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dd_dev_err(dd, "pci_alloc_irq_vectors() failed: %d\n", ret);
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return ret;
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}
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entries = kcalloc(total, sizeof(*dd->msix_info.msix_entries),
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GFP_KERNEL);
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if (!entries) {
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pci_free_irq_vectors(dd->pcidev);
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return -ENOMEM;
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}
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dd->msix_info.msix_entries = entries;
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spin_lock_init(&dd->msix_info.msix_lock);
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bitmap_zero(dd->msix_info.in_use_msix, total);
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dd->msix_info.max_requested = total;
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dd_dev_info(dd, "%u MSI-X interrupts allocated\n", total);
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return 0;
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}
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/**
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* msix_request_irq() - Allocate a free MSIx IRQ
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* @dd: valid devdata
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* @arg: context information for the IRQ
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* @handler: IRQ handler
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* @thread: IRQ thread handler (could be NULL)
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* @type: affinty IRQ type
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* @name: IRQ name
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*
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* Allocated an MSIx vector if available, and then create the appropriate
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* meta data needed to keep track of the pci IRQ request.
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*
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* Return:
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* < 0 Error
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* >= 0 MSIx vector
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*
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*/
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static int msix_request_irq(struct hfi1_devdata *dd, void *arg,
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irq_handler_t handler, irq_handler_t thread,
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enum irq_type type, const char *name)
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{
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unsigned long nr;
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int irq;
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int ret;
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struct hfi1_msix_entry *me;
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/* Allocate an MSIx vector */
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spin_lock(&dd->msix_info.msix_lock);
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nr = find_first_zero_bit(dd->msix_info.in_use_msix,
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dd->msix_info.max_requested);
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if (nr < dd->msix_info.max_requested)
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__set_bit(nr, dd->msix_info.in_use_msix);
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spin_unlock(&dd->msix_info.msix_lock);
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if (nr == dd->msix_info.max_requested)
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return -ENOSPC;
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if (type < IRQ_SDMA || type >= IRQ_OTHER)
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return -EINVAL;
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irq = pci_irq_vector(dd->pcidev, nr);
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ret = pci_request_irq(dd->pcidev, nr, handler, thread, arg, name);
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if (ret) {
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dd_dev_err(dd,
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"%s: request for IRQ %d failed, MSIx %lx, err %d\n",
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name, irq, nr, ret);
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spin_lock(&dd->msix_info.msix_lock);
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__clear_bit(nr, dd->msix_info.in_use_msix);
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spin_unlock(&dd->msix_info.msix_lock);
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return ret;
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}
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/*
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* assign arg after pci_request_irq call, so it will be
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* cleaned up
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*/
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me = &dd->msix_info.msix_entries[nr];
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me->irq = irq;
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me->arg = arg;
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me->type = type;
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/* This is a request, so a failure is not fatal */
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ret = hfi1_get_irq_affinity(dd, me);
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if (ret)
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dd_dev_err(dd, "%s: unable to pin IRQ %d\n", name, ret);
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return nr;
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}
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static int msix_request_rcd_irq_common(struct hfi1_ctxtdata *rcd,
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irq_handler_t handler,
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irq_handler_t thread,
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const char *name)
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{
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int nr = msix_request_irq(rcd->dd, rcd, handler, thread,
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rcd->is_vnic ? IRQ_NETDEVCTXT : IRQ_RCVCTXT,
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name);
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if (nr < 0)
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return nr;
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/*
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* Set the interrupt register and mask for this
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* context's interrupt.
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*/
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rcd->ireg = (IS_RCVAVAIL_START + rcd->ctxt) / 64;
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rcd->imask = ((u64)1) << ((IS_RCVAVAIL_START + rcd->ctxt) % 64);
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rcd->msix_intr = nr;
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remap_intr(rcd->dd, IS_RCVAVAIL_START + rcd->ctxt, nr);
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return 0;
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}
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/**
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* msix_request_rcd_irq() - Helper function for RCVAVAIL IRQs
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* @rcd: valid rcd context
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*
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*/
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int msix_request_rcd_irq(struct hfi1_ctxtdata *rcd)
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{
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char name[MAX_NAME_SIZE];
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snprintf(name, sizeof(name), DRIVER_NAME "_%d kctxt%d",
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rcd->dd->unit, rcd->ctxt);
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return msix_request_rcd_irq_common(rcd, receive_context_interrupt,
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receive_context_thread, name);
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}
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/**
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* msix_netdev_request_rcd_irq - Helper function for RCVAVAIL IRQs
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* for netdev context
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* @rcd: valid netdev contexti
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*/
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int msix_netdev_request_rcd_irq(struct hfi1_ctxtdata *rcd)
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{
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char name[MAX_NAME_SIZE];
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snprintf(name, sizeof(name), DRIVER_NAME "_%d nd kctxt%d",
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rcd->dd->unit, rcd->ctxt);
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return msix_request_rcd_irq_common(rcd, receive_context_interrupt_napi,
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NULL, name);
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}
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/**
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* msix_request_sdma_irq - Helper for getting SDMA IRQ resources
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* @sde: valid sdma engine
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*
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*/
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int msix_request_sdma_irq(struct sdma_engine *sde)
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{
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int nr;
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char name[MAX_NAME_SIZE];
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snprintf(name, sizeof(name), DRIVER_NAME "_%d sdma%d",
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sde->dd->unit, sde->this_idx);
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nr = msix_request_irq(sde->dd, sde, sdma_interrupt, NULL,
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IRQ_SDMA, name);
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if (nr < 0)
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return nr;
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sde->msix_intr = nr;
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remap_sdma_interrupts(sde->dd, sde->this_idx, nr);
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return 0;
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}
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/**
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* msix_request_general_irq - Helper for getting general IRQ
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* resources
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* @dd: valid device data
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*/
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int msix_request_general_irq(struct hfi1_devdata *dd)
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{
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int nr;
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char name[MAX_NAME_SIZE];
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snprintf(name, sizeof(name), DRIVER_NAME "_%d", dd->unit);
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nr = msix_request_irq(dd, dd, general_interrupt, NULL, IRQ_GENERAL,
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name);
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if (nr < 0)
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return nr;
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/* general interrupt must be MSIx vector 0 */
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if (nr) {
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msix_free_irq(dd, (u8)nr);
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dd_dev_err(dd, "Invalid index %d for GENERAL IRQ\n", nr);
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return -EINVAL;
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}
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return 0;
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}
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/**
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* enable_sdma_srcs - Helper to enable SDMA IRQ srcs
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* @dd: valid devdata structure
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* @i: index of SDMA engine
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*/
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static void enable_sdma_srcs(struct hfi1_devdata *dd, int i)
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{
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set_intr_bits(dd, IS_SDMA_START + i, IS_SDMA_START + i, true);
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set_intr_bits(dd, IS_SDMA_PROGRESS_START + i,
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IS_SDMA_PROGRESS_START + i, true);
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set_intr_bits(dd, IS_SDMA_IDLE_START + i, IS_SDMA_IDLE_START + i, true);
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set_intr_bits(dd, IS_SDMAENG_ERR_START + i, IS_SDMAENG_ERR_START + i,
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true);
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}
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/**
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* msix_request_irqs() - Allocate all MSIx IRQs
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* @dd: valid devdata structure
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*
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* Helper function to request the used MSIx IRQs.
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*
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*/
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int msix_request_irqs(struct hfi1_devdata *dd)
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{
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int i;
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int ret = msix_request_general_irq(dd);
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if (ret)
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return ret;
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for (i = 0; i < dd->num_sdma; i++) {
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struct sdma_engine *sde = &dd->per_sdma[i];
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ret = msix_request_sdma_irq(sde);
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if (ret)
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return ret;
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enable_sdma_srcs(sde->dd, i);
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}
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for (i = 0; i < dd->n_krcv_queues; i++) {
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struct hfi1_ctxtdata *rcd = hfi1_rcd_get_by_index_safe(dd, i);
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if (rcd)
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ret = msix_request_rcd_irq(rcd);
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hfi1_rcd_put(rcd);
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if (ret)
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return ret;
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}
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return 0;
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}
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/**
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* msix_free_irq() - Free the specified MSIx resources and IRQ
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* @dd: valid devdata
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* @msix_intr: MSIx vector to free.
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*
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*/
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void msix_free_irq(struct hfi1_devdata *dd, u8 msix_intr)
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{
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struct hfi1_msix_entry *me;
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if (msix_intr >= dd->msix_info.max_requested)
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return;
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me = &dd->msix_info.msix_entries[msix_intr];
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if (!me->arg) /* => no irq, no affinity */
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return;
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hfi1_put_irq_affinity(dd, me);
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pci_free_irq(dd->pcidev, msix_intr, me->arg);
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me->arg = NULL;
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spin_lock(&dd->msix_info.msix_lock);
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__clear_bit(msix_intr, dd->msix_info.in_use_msix);
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spin_unlock(&dd->msix_info.msix_lock);
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}
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/**
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* msix_clean_up_interrupts - Free all MSIx IRQ resources
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* @dd: valid device data data structure
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*
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* Free the MSIx and associated PCI resources, if they have been allocated.
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*/
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void msix_clean_up_interrupts(struct hfi1_devdata *dd)
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{
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int i;
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struct hfi1_msix_entry *me = dd->msix_info.msix_entries;
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/* remove irqs - must happen before disabling/turning off */
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for (i = 0; i < dd->msix_info.max_requested; i++, me++)
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msix_free_irq(dd, i);
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/* clean structures */
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kfree(dd->msix_info.msix_entries);
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dd->msix_info.msix_entries = NULL;
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dd->msix_info.max_requested = 0;
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pci_free_irq_vectors(dd->pcidev);
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}
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/**
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* msix_netdev_synchronize_irq - netdev IRQ synchronize
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* @dd: valid devdata
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*/
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void msix_netdev_synchronize_irq(struct hfi1_devdata *dd)
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{
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int i;
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int ctxt_count = hfi1_netdev_ctxt_count(dd);
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for (i = 0; i < ctxt_count; i++) {
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struct hfi1_ctxtdata *rcd = hfi1_netdev_get_ctxt(dd, i);
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struct hfi1_msix_entry *me;
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me = &dd->msix_info.msix_entries[rcd->msix_intr];
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synchronize_irq(me->irq);
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}
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}
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