diff options
Diffstat (limited to 'drivers/infiniband/hw/hfi1/msix.c')
| -rw-r--r-- | drivers/infiniband/hw/hfi1/msix.c | 348 |
1 files changed, 348 insertions, 0 deletions
diff --git a/drivers/infiniband/hw/hfi1/msix.c b/drivers/infiniband/hw/hfi1/msix.c new file mode 100644 index 0000000000..77d2ece9a9 --- /dev/null +++ b/drivers/infiniband/hw/hfi1/msix.c @@ -0,0 +1,348 @@ +// SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause) +/* + * Copyright(c) 2018 - 2020 Intel Corporation. + */ + +#include "hfi.h" +#include "affinity.h" +#include "sdma.h" +#include "netdev.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_netdev_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) + * @type: affinty IRQ type + * @name: IRQ name + * + * 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, + enum irq_type type, const char *name) +{ + unsigned long nr; + int irq; + int ret; + 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; + + if (type < IRQ_SDMA || type >= IRQ_OTHER) + return -EINVAL; + + 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 %lx, err %d\n", + name, irq, nr, 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, "%s: unable to pin IRQ %d\n", name, ret); + + return nr; +} + +static int msix_request_rcd_irq_common(struct hfi1_ctxtdata *rcd, + irq_handler_t handler, + irq_handler_t thread, + const char *name) +{ + int nr = msix_request_irq(rcd->dd, rcd, handler, thread, + rcd->is_vnic ? IRQ_NETDEVCTXT : IRQ_RCVCTXT, + name); + 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_rcd_irq() - Helper function for RCVAVAIL IRQs + * @rcd: valid rcd context + * + */ +int msix_request_rcd_irq(struct hfi1_ctxtdata *rcd) +{ + char name[MAX_NAME_SIZE]; + + snprintf(name, sizeof(name), DRIVER_NAME "_%d kctxt%d", + rcd->dd->unit, rcd->ctxt); + + return msix_request_rcd_irq_common(rcd, receive_context_interrupt, + receive_context_thread, name); +} + +/** + * msix_netdev_request_rcd_irq - Helper function for RCVAVAIL IRQs + * for netdev context + * @rcd: valid netdev contexti + */ +int msix_netdev_request_rcd_irq(struct hfi1_ctxtdata *rcd) +{ + char name[MAX_NAME_SIZE]; + + snprintf(name, sizeof(name), DRIVER_NAME "_%d nd kctxt%d", + rcd->dd->unit, rcd->ctxt); + return msix_request_rcd_irq_common(rcd, receive_context_interrupt_napi, + NULL, name); +} + +/** + * msix_request_sdma_irq - Helper for getting SDMA IRQ resources + * @sde: valid sdma engine + * + */ +int msix_request_sdma_irq(struct sdma_engine *sde) +{ + int nr; + char name[MAX_NAME_SIZE]; + + snprintf(name, sizeof(name), DRIVER_NAME "_%d sdma%d", + sde->dd->unit, sde->this_idx); + nr = msix_request_irq(sde->dd, sde, sdma_interrupt, NULL, + IRQ_SDMA, name); + if (nr < 0) + return nr; + sde->msix_intr = nr; + remap_sdma_interrupts(sde->dd, sde->this_idx, nr); + + return 0; +} + +/** + * msix_request_general_irq - Helper for getting general IRQ + * resources + * @dd: valid device data + */ +int msix_request_general_irq(struct hfi1_devdata *dd) +{ + int nr; + char name[MAX_NAME_SIZE]; + + snprintf(name, sizeof(name), DRIVER_NAME "_%d", dd->unit); + nr = msix_request_irq(dd, dd, general_interrupt, NULL, IRQ_GENERAL, + name); + if (nr < 0) + return nr; + + /* general interrupt must be MSIx vector 0 */ + if (nr) { + msix_free_irq(dd, (u8)nr); + dd_dev_err(dd, "Invalid index %d for GENERAL IRQ\n", nr); + return -EINVAL; + } + + return 0; +} + +/** + * enable_sdma_srcs - 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 = msix_request_general_irq(dd); + + if (ret) + 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); +} + +/** + * msix_clean_up_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_netdev_synchronize_irq - netdev IRQ synchronize + * @dd: valid devdata + */ +void msix_netdev_synchronize_irq(struct hfi1_devdata *dd) +{ + int i; + int ctxt_count = hfi1_netdev_ctxt_count(dd); + + for (i = 0; i < ctxt_count; i++) { + struct hfi1_ctxtdata *rcd = hfi1_netdev_get_ctxt(dd, i); + struct hfi1_msix_entry *me; + + me = &dd->msix_info.msix_entries[rcd->msix_intr]; + + synchronize_irq(me->irq); + } +} |