linux/drivers/dma/idxd/init.c

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// 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 int idxd_setup_internals(struct idxd_device *idxd)
{
struct device *dev = &idxd->pdev->dev;
int i;
init_waitqueue_head(&idxd->cmd_waitq);
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];
wq->id = i;
wq->idxd = idxd;
mutex_init(&wq->wq_lock);
wq->idxd_cdev.minor = -1;
}
for (i = 0; i < idxd->max_engines; i++) {
idxd->engines[i].idxd = idxd;
idxd->engines[i].id = i;
}
idxd->wq = create_workqueue(dev_name(dev));
if (!idxd->wq)
return -ENOMEM;
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__);
idxd_device_init_reset(idxd);
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);
rc = idxd_device_disable(idxd);
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);
}
destroy_workqueue(idxd->wq);
}
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);
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);