diff options
Diffstat (limited to 'drivers/dma/idxd/init.c')
| -rw-r--r-- | drivers/dma/idxd/init.c | 533 |
1 files changed, 533 insertions, 0 deletions
diff --git a/drivers/dma/idxd/init.c b/drivers/dma/idxd/init.c new file mode 100644 index 000000000000..7778c05deb5d --- /dev/null +++ b/drivers/dma/idxd/init.c @@ -0,0 +1,533 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright(c) 2019 Intel Corporation. All rights rsvd. */ +#include <linux/init.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/slab.h> +#include <linux/pci.h> +#include <linux/interrupt.h> +#include <linux/delay.h> +#include <linux/dma-mapping.h> +#include <linux/workqueue.h> +#include <linux/aer.h> +#include <linux/fs.h> +#include <linux/io-64-nonatomic-lo-hi.h> +#include <linux/device.h> +#include <linux/idr.h> +#include <uapi/linux/idxd.h> +#include <linux/dmaengine.h> +#include "../dmaengine.h" +#include "registers.h" +#include "idxd.h" + +MODULE_VERSION(IDXD_DRIVER_VERSION); +MODULE_LICENSE("GPL v2"); +MODULE_AUTHOR("Intel Corporation"); + +#define DRV_NAME "idxd" + +static struct idr idxd_idrs[IDXD_TYPE_MAX]; +static struct mutex idxd_idr_lock; + +static struct pci_device_id idxd_pci_tbl[] = { + /* DSA ver 1.0 platforms */ + { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_DSA_SPR0) }, + { 0, } +}; +MODULE_DEVICE_TABLE(pci, idxd_pci_tbl); + +static char *idxd_name[] = { + "dsa", +}; + +const char *idxd_get_dev_name(struct idxd_device *idxd) +{ + return idxd_name[idxd->type]; +} + +static int idxd_setup_interrupts(struct idxd_device *idxd) +{ + struct pci_dev *pdev = idxd->pdev; + struct device *dev = &pdev->dev; + struct msix_entry *msix; + struct idxd_irq_entry *irq_entry; + int i, msixcnt; + int rc = 0; + + msixcnt = pci_msix_vec_count(pdev); + if (msixcnt < 0) { + dev_err(dev, "Not MSI-X interrupt capable.\n"); + goto err_no_irq; + } + + idxd->msix_entries = devm_kzalloc(dev, sizeof(struct msix_entry) * + msixcnt, GFP_KERNEL); + if (!idxd->msix_entries) { + rc = -ENOMEM; + goto err_no_irq; + } + + for (i = 0; i < msixcnt; i++) + idxd->msix_entries[i].entry = i; + + rc = pci_enable_msix_exact(pdev, idxd->msix_entries, msixcnt); + if (rc) { + dev_err(dev, "Failed enabling %d MSIX entries.\n", msixcnt); + goto err_no_irq; + } + dev_dbg(dev, "Enabled %d msix vectors\n", msixcnt); + + /* + * We implement 1 completion list per MSI-X entry except for + * entry 0, which is for errors and others. + */ + idxd->irq_entries = devm_kcalloc(dev, msixcnt, + sizeof(struct idxd_irq_entry), + GFP_KERNEL); + if (!idxd->irq_entries) { + rc = -ENOMEM; + goto err_no_irq; + } + + for (i = 0; i < msixcnt; i++) { + idxd->irq_entries[i].id = i; + idxd->irq_entries[i].idxd = idxd; + } + + msix = &idxd->msix_entries[0]; + irq_entry = &idxd->irq_entries[0]; + rc = devm_request_threaded_irq(dev, msix->vector, idxd_irq_handler, + idxd_misc_thread, 0, "idxd-misc", + irq_entry); + if (rc < 0) { + dev_err(dev, "Failed to allocate misc interrupt.\n"); + goto err_no_irq; + } + + dev_dbg(dev, "Allocated idxd-misc handler on msix vector %d\n", + msix->vector); + + /* first MSI-X entry is not for wq interrupts */ + idxd->num_wq_irqs = msixcnt - 1; + + for (i = 1; i < msixcnt; i++) { + msix = &idxd->msix_entries[i]; + irq_entry = &idxd->irq_entries[i]; + + init_llist_head(&idxd->irq_entries[i].pending_llist); + INIT_LIST_HEAD(&idxd->irq_entries[i].work_list); + rc = devm_request_threaded_irq(dev, msix->vector, + idxd_irq_handler, + idxd_wq_thread, 0, + "idxd-portal", irq_entry); + if (rc < 0) { + dev_err(dev, "Failed to allocate irq %d.\n", + msix->vector); + goto err_no_irq; + } + dev_dbg(dev, "Allocated idxd-msix %d for vector %d\n", + i, msix->vector); + } + + idxd_unmask_error_interrupts(idxd); + + return 0; + + err_no_irq: + /* Disable error interrupt generation */ + idxd_mask_error_interrupts(idxd); + pci_disable_msix(pdev); + dev_err(dev, "No usable interrupts\n"); + return rc; +} + +static void idxd_wqs_free_lock(struct idxd_device *idxd) +{ + int i; + + for (i = 0; i < idxd->max_wqs; i++) { + struct idxd_wq *wq = &idxd->wqs[i]; + + percpu_free_rwsem(&wq->submit_lock); + } +} + +static int idxd_setup_internals(struct idxd_device *idxd) +{ + struct device *dev = &idxd->pdev->dev; + int i; + + idxd->groups = devm_kcalloc(dev, idxd->max_groups, + sizeof(struct idxd_group), GFP_KERNEL); + if (!idxd->groups) + return -ENOMEM; + + for (i = 0; i < idxd->max_groups; i++) { + idxd->groups[i].idxd = idxd; + idxd->groups[i].id = i; + idxd->groups[i].tc_a = -1; + idxd->groups[i].tc_b = -1; + } + + idxd->wqs = devm_kcalloc(dev, idxd->max_wqs, sizeof(struct idxd_wq), + GFP_KERNEL); + if (!idxd->wqs) + return -ENOMEM; + + idxd->engines = devm_kcalloc(dev, idxd->max_engines, + sizeof(struct idxd_engine), GFP_KERNEL); + if (!idxd->engines) + return -ENOMEM; + + for (i = 0; i < idxd->max_wqs; i++) { + struct idxd_wq *wq = &idxd->wqs[i]; + int rc; + + wq->id = i; + wq->idxd = idxd; + mutex_init(&wq->wq_lock); + atomic_set(&wq->dq_count, 0); + init_waitqueue_head(&wq->submit_waitq); + wq->idxd_cdev.minor = -1; + rc = percpu_init_rwsem(&wq->submit_lock); + if (rc < 0) { + idxd_wqs_free_lock(idxd); + return rc; + } + } + + for (i = 0; i < idxd->max_engines; i++) { + idxd->engines[i].idxd = idxd; + idxd->engines[i].id = i; + } + + return 0; +} + +static void idxd_read_table_offsets(struct idxd_device *idxd) +{ + union offsets_reg offsets; + struct device *dev = &idxd->pdev->dev; + + offsets.bits[0] = ioread64(idxd->reg_base + IDXD_TABLE_OFFSET); + offsets.bits[1] = ioread64(idxd->reg_base + IDXD_TABLE_OFFSET + + sizeof(u64)); + idxd->grpcfg_offset = offsets.grpcfg * 0x100; + dev_dbg(dev, "IDXD Group Config Offset: %#x\n", idxd->grpcfg_offset); + idxd->wqcfg_offset = offsets.wqcfg * 0x100; + dev_dbg(dev, "IDXD Work Queue Config Offset: %#x\n", + idxd->wqcfg_offset); + idxd->msix_perm_offset = offsets.msix_perm * 0x100; + dev_dbg(dev, "IDXD MSIX Permission Offset: %#x\n", + idxd->msix_perm_offset); + idxd->perfmon_offset = offsets.perfmon * 0x100; + dev_dbg(dev, "IDXD Perfmon Offset: %#x\n", idxd->perfmon_offset); +} + +static void idxd_read_caps(struct idxd_device *idxd) +{ + struct device *dev = &idxd->pdev->dev; + int i; + + /* reading generic capabilities */ + idxd->hw.gen_cap.bits = ioread64(idxd->reg_base + IDXD_GENCAP_OFFSET); + dev_dbg(dev, "gen_cap: %#llx\n", idxd->hw.gen_cap.bits); + idxd->max_xfer_bytes = 1ULL << idxd->hw.gen_cap.max_xfer_shift; + dev_dbg(dev, "max xfer size: %llu bytes\n", idxd->max_xfer_bytes); + idxd->max_batch_size = 1U << idxd->hw.gen_cap.max_batch_shift; + dev_dbg(dev, "max batch size: %u\n", idxd->max_batch_size); + if (idxd->hw.gen_cap.config_en) + set_bit(IDXD_FLAG_CONFIGURABLE, &idxd->flags); + + /* reading group capabilities */ + idxd->hw.group_cap.bits = + ioread64(idxd->reg_base + IDXD_GRPCAP_OFFSET); + dev_dbg(dev, "group_cap: %#llx\n", idxd->hw.group_cap.bits); + idxd->max_groups = idxd->hw.group_cap.num_groups; + dev_dbg(dev, "max groups: %u\n", idxd->max_groups); + idxd->max_tokens = idxd->hw.group_cap.total_tokens; + dev_dbg(dev, "max tokens: %u\n", idxd->max_tokens); + idxd->nr_tokens = idxd->max_tokens; + + /* read engine capabilities */ + idxd->hw.engine_cap.bits = + ioread64(idxd->reg_base + IDXD_ENGCAP_OFFSET); + dev_dbg(dev, "engine_cap: %#llx\n", idxd->hw.engine_cap.bits); + idxd->max_engines = idxd->hw.engine_cap.num_engines; + dev_dbg(dev, "max engines: %u\n", idxd->max_engines); + + /* read workqueue capabilities */ + idxd->hw.wq_cap.bits = ioread64(idxd->reg_base + IDXD_WQCAP_OFFSET); + dev_dbg(dev, "wq_cap: %#llx\n", idxd->hw.wq_cap.bits); + idxd->max_wq_size = idxd->hw.wq_cap.total_wq_size; + dev_dbg(dev, "total workqueue size: %u\n", idxd->max_wq_size); + idxd->max_wqs = idxd->hw.wq_cap.num_wqs; + dev_dbg(dev, "max workqueues: %u\n", idxd->max_wqs); + + /* reading operation capabilities */ + for (i = 0; i < 4; i++) { + idxd->hw.opcap.bits[i] = ioread64(idxd->reg_base + + IDXD_OPCAP_OFFSET + i * sizeof(u64)); + dev_dbg(dev, "opcap[%d]: %#llx\n", i, idxd->hw.opcap.bits[i]); + } +} + +static struct idxd_device *idxd_alloc(struct pci_dev *pdev, + void __iomem * const *iomap) +{ + struct device *dev = &pdev->dev; + struct idxd_device *idxd; + + idxd = devm_kzalloc(dev, sizeof(struct idxd_device), GFP_KERNEL); + if (!idxd) + return NULL; + + idxd->pdev = pdev; + idxd->reg_base = iomap[IDXD_MMIO_BAR]; + spin_lock_init(&idxd->dev_lock); + + return idxd; +} + +static int idxd_probe(struct idxd_device *idxd) +{ + struct pci_dev *pdev = idxd->pdev; + struct device *dev = &pdev->dev; + int rc; + + dev_dbg(dev, "%s entered and resetting device\n", __func__); + rc = idxd_device_reset(idxd); + if (rc < 0) + return rc; + dev_dbg(dev, "IDXD reset complete\n"); + + idxd_read_caps(idxd); + idxd_read_table_offsets(idxd); + + rc = idxd_setup_internals(idxd); + if (rc) + goto err_setup; + + rc = idxd_setup_interrupts(idxd); + if (rc) + goto err_setup; + + dev_dbg(dev, "IDXD interrupt setup complete.\n"); + + mutex_lock(&idxd_idr_lock); + idxd->id = idr_alloc(&idxd_idrs[idxd->type], idxd, 0, 0, GFP_KERNEL); + mutex_unlock(&idxd_idr_lock); + if (idxd->id < 0) { + rc = -ENOMEM; + goto err_idr_fail; + } + + idxd->major = idxd_cdev_get_major(idxd); + + dev_dbg(dev, "IDXD device %d probed successfully\n", idxd->id); + return 0; + + err_idr_fail: + idxd_mask_error_interrupts(idxd); + idxd_mask_msix_vectors(idxd); + err_setup: + return rc; +} + +static int idxd_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id) +{ + void __iomem * const *iomap; + struct device *dev = &pdev->dev; + struct idxd_device *idxd; + int rc; + unsigned int mask; + + rc = pcim_enable_device(pdev); + if (rc) + return rc; + + dev_dbg(dev, "Mapping BARs\n"); + mask = (1 << IDXD_MMIO_BAR); + rc = pcim_iomap_regions(pdev, mask, DRV_NAME); + if (rc) + return rc; + + iomap = pcim_iomap_table(pdev); + if (!iomap) + return -ENOMEM; + + dev_dbg(dev, "Set DMA masks\n"); + rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(64)); + if (rc) + rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(32)); + if (rc) + return rc; + + rc = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64)); + if (rc) + rc = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32)); + if (rc) + return rc; + + dev_dbg(dev, "Alloc IDXD context\n"); + idxd = idxd_alloc(pdev, iomap); + if (!idxd) + return -ENOMEM; + + idxd_set_type(idxd); + + dev_dbg(dev, "Set PCI master\n"); + pci_set_master(pdev); + pci_set_drvdata(pdev, idxd); + + idxd->hw.version = ioread32(idxd->reg_base + IDXD_VER_OFFSET); + rc = idxd_probe(idxd); + if (rc) { + dev_err(dev, "Intel(R) IDXD DMA Engine init failed\n"); + return -ENODEV; + } + + rc = idxd_setup_sysfs(idxd); + if (rc) { + dev_err(dev, "IDXD sysfs setup failed\n"); + return -ENODEV; + } + + idxd->state = IDXD_DEV_CONF_READY; + + dev_info(&pdev->dev, "Intel(R) Accelerator Device (v%x)\n", + idxd->hw.version); + + return 0; +} + +static void idxd_flush_pending_llist(struct idxd_irq_entry *ie) +{ + struct idxd_desc *desc, *itr; + struct llist_node *head; + + head = llist_del_all(&ie->pending_llist); + if (!head) + return; + + llist_for_each_entry_safe(desc, itr, head, llnode) { + idxd_dma_complete_txd(desc, IDXD_COMPLETE_ABORT); + idxd_free_desc(desc->wq, desc); + } +} + +static void idxd_flush_work_list(struct idxd_irq_entry *ie) +{ + struct idxd_desc *desc, *iter; + + list_for_each_entry_safe(desc, iter, &ie->work_list, list) { + list_del(&desc->list); + idxd_dma_complete_txd(desc, IDXD_COMPLETE_ABORT); + idxd_free_desc(desc->wq, desc); + } +} + +static void idxd_shutdown(struct pci_dev *pdev) +{ + struct idxd_device *idxd = pci_get_drvdata(pdev); + int rc, i; + struct idxd_irq_entry *irq_entry; + int msixcnt = pci_msix_vec_count(pdev); + unsigned long flags; + + spin_lock_irqsave(&idxd->dev_lock, flags); + rc = idxd_device_disable(idxd); + spin_unlock_irqrestore(&idxd->dev_lock, flags); + if (rc) + dev_err(&pdev->dev, "Disabling device failed\n"); + + dev_dbg(&pdev->dev, "%s called\n", __func__); + idxd_mask_msix_vectors(idxd); + idxd_mask_error_interrupts(idxd); + + for (i = 0; i < msixcnt; i++) { + irq_entry = &idxd->irq_entries[i]; + synchronize_irq(idxd->msix_entries[i].vector); + if (i == 0) + continue; + idxd_flush_pending_llist(irq_entry); + idxd_flush_work_list(irq_entry); + } +} + +static void idxd_remove(struct pci_dev *pdev) +{ + struct idxd_device *idxd = pci_get_drvdata(pdev); + + dev_dbg(&pdev->dev, "%s called\n", __func__); + idxd_cleanup_sysfs(idxd); + idxd_shutdown(pdev); + idxd_wqs_free_lock(idxd); + mutex_lock(&idxd_idr_lock); + idr_remove(&idxd_idrs[idxd->type], idxd->id); + mutex_unlock(&idxd_idr_lock); +} + +static struct pci_driver idxd_pci_driver = { + .name = DRV_NAME, + .id_table = idxd_pci_tbl, + .probe = idxd_pci_probe, + .remove = idxd_remove, + .shutdown = idxd_shutdown, +}; + +static int __init idxd_init_module(void) +{ + int err, i; + + /* + * If the CPU does not support write512, there's no point in + * enumerating the device. We can not utilize it. + */ + if (!boot_cpu_has(X86_FEATURE_MOVDIR64B)) { + pr_warn("idxd driver failed to load without MOVDIR64B.\n"); + return -ENODEV; + } + + pr_info("%s: Intel(R) Accelerator Devices Driver %s\n", + DRV_NAME, IDXD_DRIVER_VERSION); + + mutex_init(&idxd_idr_lock); + for (i = 0; i < IDXD_TYPE_MAX; i++) + idr_init(&idxd_idrs[i]); + + err = idxd_register_bus_type(); + if (err < 0) + return err; + + err = idxd_register_driver(); + if (err < 0) + goto err_idxd_driver_register; + + err = idxd_cdev_register(); + if (err) + goto err_cdev_register; + + err = pci_register_driver(&idxd_pci_driver); + if (err) + goto err_pci_register; + + return 0; + +err_pci_register: + idxd_cdev_remove(); +err_cdev_register: + idxd_unregister_driver(); +err_idxd_driver_register: + idxd_unregister_bus_type(); + return err; +} +module_init(idxd_init_module); + +static void __exit idxd_exit_module(void) +{ + pci_unregister_driver(&idxd_pci_driver); + idxd_cdev_remove(); + idxd_unregister_bus_type(); +} +module_exit(idxd_exit_module); |