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-rw-r--r--drivers/dma/idxd/init.c913
1 files changed, 913 insertions, 0 deletions
diff --git a/drivers/dma/idxd/init.c b/drivers/dma/idxd/init.c
new file mode 100644
index 0000000000..0eb1c827a2
--- /dev/null
+++ b/drivers/dma/idxd/init.c
@@ -0,0 +1,913 @@
+// 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/fs.h>
+#include <linux/io-64-nonatomic-lo-hi.h>
+#include <linux/device.h>
+#include <linux/idr.h>
+#include <linux/iommu.h>
+#include <uapi/linux/idxd.h>
+#include <linux/dmaengine.h>
+#include "../dmaengine.h"
+#include "registers.h"
+#include "idxd.h"
+#include "perfmon.h"
+
+MODULE_VERSION(IDXD_DRIVER_VERSION);
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Intel Corporation");
+MODULE_IMPORT_NS(IDXD);
+
+static bool sva = true;
+module_param(sva, bool, 0644);
+MODULE_PARM_DESC(sva, "Toggle SVA support on/off");
+
+bool tc_override;
+module_param(tc_override, bool, 0644);
+MODULE_PARM_DESC(tc_override, "Override traffic class defaults");
+
+#define DRV_NAME "idxd"
+
+bool support_enqcmd;
+DEFINE_IDA(idxd_ida);
+
+static struct idxd_driver_data idxd_driver_data[] = {
+ [IDXD_TYPE_DSA] = {
+ .name_prefix = "dsa",
+ .type = IDXD_TYPE_DSA,
+ .compl_size = sizeof(struct dsa_completion_record),
+ .align = 32,
+ .dev_type = &dsa_device_type,
+ .evl_cr_off = offsetof(struct dsa_evl_entry, cr),
+ .cr_status_off = offsetof(struct dsa_completion_record, status),
+ .cr_result_off = offsetof(struct dsa_completion_record, result),
+ },
+ [IDXD_TYPE_IAX] = {
+ .name_prefix = "iax",
+ .type = IDXD_TYPE_IAX,
+ .compl_size = sizeof(struct iax_completion_record),
+ .align = 64,
+ .dev_type = &iax_device_type,
+ .evl_cr_off = offsetof(struct iax_evl_entry, cr),
+ .cr_status_off = offsetof(struct iax_completion_record, status),
+ .cr_result_off = offsetof(struct iax_completion_record, error_code),
+ },
+};
+
+static struct pci_device_id idxd_pci_tbl[] = {
+ /* DSA ver 1.0 platforms */
+ { PCI_DEVICE_DATA(INTEL, DSA_SPR0, &idxd_driver_data[IDXD_TYPE_DSA]) },
+
+ /* IAX ver 1.0 platforms */
+ { PCI_DEVICE_DATA(INTEL, IAX_SPR0, &idxd_driver_data[IDXD_TYPE_IAX]) },
+ { 0, }
+};
+MODULE_DEVICE_TABLE(pci, idxd_pci_tbl);
+
+static int idxd_setup_interrupts(struct idxd_device *idxd)
+{
+ struct pci_dev *pdev = idxd->pdev;
+ struct device *dev = &pdev->dev;
+ struct idxd_irq_entry *ie;
+ int i, msixcnt;
+ int rc = 0;
+
+ msixcnt = pci_msix_vec_count(pdev);
+ if (msixcnt < 0) {
+ dev_err(dev, "Not MSI-X interrupt capable.\n");
+ return -ENOSPC;
+ }
+ idxd->irq_cnt = msixcnt;
+
+ rc = pci_alloc_irq_vectors(pdev, msixcnt, msixcnt, PCI_IRQ_MSIX);
+ if (rc != msixcnt) {
+ dev_err(dev, "Failed enabling %d MSIX entries: %d\n", msixcnt, rc);
+ return -ENOSPC;
+ }
+ dev_dbg(dev, "Enabled %d msix vectors\n", msixcnt);
+
+
+ ie = idxd_get_ie(idxd, 0);
+ ie->vector = pci_irq_vector(pdev, 0);
+ rc = request_threaded_irq(ie->vector, NULL, idxd_misc_thread, 0, "idxd-misc", ie);
+ if (rc < 0) {
+ dev_err(dev, "Failed to allocate misc interrupt.\n");
+ goto err_misc_irq;
+ }
+ dev_dbg(dev, "Requested idxd-misc handler on msix vector %d\n", ie->vector);
+
+ for (i = 0; i < idxd->max_wqs; i++) {
+ int msix_idx = i + 1;
+
+ ie = idxd_get_ie(idxd, msix_idx);
+ ie->id = msix_idx;
+ ie->int_handle = INVALID_INT_HANDLE;
+ ie->pasid = IOMMU_PASID_INVALID;
+
+ spin_lock_init(&ie->list_lock);
+ init_llist_head(&ie->pending_llist);
+ INIT_LIST_HEAD(&ie->work_list);
+ }
+
+ idxd_unmask_error_interrupts(idxd);
+ return 0;
+
+ err_misc_irq:
+ idxd_mask_error_interrupts(idxd);
+ pci_free_irq_vectors(pdev);
+ dev_err(dev, "No usable interrupts\n");
+ return rc;
+}
+
+static void idxd_cleanup_interrupts(struct idxd_device *idxd)
+{
+ struct pci_dev *pdev = idxd->pdev;
+ struct idxd_irq_entry *ie;
+ int msixcnt;
+
+ msixcnt = pci_msix_vec_count(pdev);
+ if (msixcnt <= 0)
+ return;
+
+ ie = idxd_get_ie(idxd, 0);
+ idxd_mask_error_interrupts(idxd);
+ free_irq(ie->vector, ie);
+ pci_free_irq_vectors(pdev);
+}
+
+static int idxd_setup_wqs(struct idxd_device *idxd)
+{
+ struct device *dev = &idxd->pdev->dev;
+ struct idxd_wq *wq;
+ struct device *conf_dev;
+ int i, rc;
+
+ idxd->wqs = kcalloc_node(idxd->max_wqs, sizeof(struct idxd_wq *),
+ GFP_KERNEL, dev_to_node(dev));
+ if (!idxd->wqs)
+ return -ENOMEM;
+
+ idxd->wq_enable_map = bitmap_zalloc_node(idxd->max_wqs, GFP_KERNEL, dev_to_node(dev));
+ if (!idxd->wq_enable_map) {
+ kfree(idxd->wqs);
+ return -ENOMEM;
+ }
+
+ for (i = 0; i < idxd->max_wqs; i++) {
+ wq = kzalloc_node(sizeof(*wq), GFP_KERNEL, dev_to_node(dev));
+ if (!wq) {
+ rc = -ENOMEM;
+ goto err;
+ }
+
+ idxd_dev_set_type(&wq->idxd_dev, IDXD_DEV_WQ);
+ conf_dev = wq_confdev(wq);
+ wq->id = i;
+ wq->idxd = idxd;
+ device_initialize(wq_confdev(wq));
+ conf_dev->parent = idxd_confdev(idxd);
+ conf_dev->bus = &dsa_bus_type;
+ conf_dev->type = &idxd_wq_device_type;
+ rc = dev_set_name(conf_dev, "wq%d.%d", idxd->id, wq->id);
+ if (rc < 0) {
+ put_device(conf_dev);
+ goto err;
+ }
+
+ mutex_init(&wq->wq_lock);
+ init_waitqueue_head(&wq->err_queue);
+ init_completion(&wq->wq_dead);
+ init_completion(&wq->wq_resurrect);
+ wq->max_xfer_bytes = WQ_DEFAULT_MAX_XFER;
+ idxd_wq_set_max_batch_size(idxd->data->type, wq, WQ_DEFAULT_MAX_BATCH);
+ wq->enqcmds_retries = IDXD_ENQCMDS_RETRIES;
+ wq->wqcfg = kzalloc_node(idxd->wqcfg_size, GFP_KERNEL, dev_to_node(dev));
+ if (!wq->wqcfg) {
+ put_device(conf_dev);
+ rc = -ENOMEM;
+ goto err;
+ }
+
+ if (idxd->hw.wq_cap.op_config) {
+ wq->opcap_bmap = bitmap_zalloc(IDXD_MAX_OPCAP_BITS, GFP_KERNEL);
+ if (!wq->opcap_bmap) {
+ put_device(conf_dev);
+ rc = -ENOMEM;
+ goto err;
+ }
+ bitmap_copy(wq->opcap_bmap, idxd->opcap_bmap, IDXD_MAX_OPCAP_BITS);
+ }
+ mutex_init(&wq->uc_lock);
+ xa_init(&wq->upasid_xa);
+ idxd->wqs[i] = wq;
+ }
+
+ return 0;
+
+ err:
+ while (--i >= 0) {
+ wq = idxd->wqs[i];
+ conf_dev = wq_confdev(wq);
+ put_device(conf_dev);
+ }
+ return rc;
+}
+
+static int idxd_setup_engines(struct idxd_device *idxd)
+{
+ struct idxd_engine *engine;
+ struct device *dev = &idxd->pdev->dev;
+ struct device *conf_dev;
+ int i, rc;
+
+ idxd->engines = kcalloc_node(idxd->max_engines, sizeof(struct idxd_engine *),
+ GFP_KERNEL, dev_to_node(dev));
+ if (!idxd->engines)
+ return -ENOMEM;
+
+ for (i = 0; i < idxd->max_engines; i++) {
+ engine = kzalloc_node(sizeof(*engine), GFP_KERNEL, dev_to_node(dev));
+ if (!engine) {
+ rc = -ENOMEM;
+ goto err;
+ }
+
+ idxd_dev_set_type(&engine->idxd_dev, IDXD_DEV_ENGINE);
+ conf_dev = engine_confdev(engine);
+ engine->id = i;
+ engine->idxd = idxd;
+ device_initialize(conf_dev);
+ conf_dev->parent = idxd_confdev(idxd);
+ conf_dev->bus = &dsa_bus_type;
+ conf_dev->type = &idxd_engine_device_type;
+ rc = dev_set_name(conf_dev, "engine%d.%d", idxd->id, engine->id);
+ if (rc < 0) {
+ put_device(conf_dev);
+ goto err;
+ }
+
+ idxd->engines[i] = engine;
+ }
+
+ return 0;
+
+ err:
+ while (--i >= 0) {
+ engine = idxd->engines[i];
+ conf_dev = engine_confdev(engine);
+ put_device(conf_dev);
+ }
+ return rc;
+}
+
+static int idxd_setup_groups(struct idxd_device *idxd)
+{
+ struct device *dev = &idxd->pdev->dev;
+ struct device *conf_dev;
+ struct idxd_group *group;
+ int i, rc;
+
+ idxd->groups = kcalloc_node(idxd->max_groups, sizeof(struct idxd_group *),
+ GFP_KERNEL, dev_to_node(dev));
+ if (!idxd->groups)
+ return -ENOMEM;
+
+ for (i = 0; i < idxd->max_groups; i++) {
+ group = kzalloc_node(sizeof(*group), GFP_KERNEL, dev_to_node(dev));
+ if (!group) {
+ rc = -ENOMEM;
+ goto err;
+ }
+
+ idxd_dev_set_type(&group->idxd_dev, IDXD_DEV_GROUP);
+ conf_dev = group_confdev(group);
+ group->id = i;
+ group->idxd = idxd;
+ device_initialize(conf_dev);
+ conf_dev->parent = idxd_confdev(idxd);
+ conf_dev->bus = &dsa_bus_type;
+ conf_dev->type = &idxd_group_device_type;
+ rc = dev_set_name(conf_dev, "group%d.%d", idxd->id, group->id);
+ if (rc < 0) {
+ put_device(conf_dev);
+ goto err;
+ }
+
+ idxd->groups[i] = group;
+ if (idxd->hw.version <= DEVICE_VERSION_2 && !tc_override) {
+ group->tc_a = 1;
+ group->tc_b = 1;
+ } else {
+ group->tc_a = -1;
+ group->tc_b = -1;
+ }
+ /*
+ * The default value is the same as the value of
+ * total read buffers in GRPCAP.
+ */
+ group->rdbufs_allowed = idxd->max_rdbufs;
+ }
+
+ return 0;
+
+ err:
+ while (--i >= 0) {
+ group = idxd->groups[i];
+ put_device(group_confdev(group));
+ }
+ return rc;
+}
+
+static void idxd_cleanup_internals(struct idxd_device *idxd)
+{
+ int i;
+
+ for (i = 0; i < idxd->max_groups; i++)
+ put_device(group_confdev(idxd->groups[i]));
+ for (i = 0; i < idxd->max_engines; i++)
+ put_device(engine_confdev(idxd->engines[i]));
+ for (i = 0; i < idxd->max_wqs; i++)
+ put_device(wq_confdev(idxd->wqs[i]));
+ destroy_workqueue(idxd->wq);
+}
+
+static int idxd_init_evl(struct idxd_device *idxd)
+{
+ struct device *dev = &idxd->pdev->dev;
+ struct idxd_evl *evl;
+
+ if (idxd->hw.gen_cap.evl_support == 0)
+ return 0;
+
+ evl = kzalloc_node(sizeof(*evl), GFP_KERNEL, dev_to_node(dev));
+ if (!evl)
+ return -ENOMEM;
+
+ spin_lock_init(&evl->lock);
+ evl->size = IDXD_EVL_SIZE_MIN;
+
+ idxd->evl_cache = kmem_cache_create(dev_name(idxd_confdev(idxd)),
+ sizeof(struct idxd_evl_fault) + evl_ent_size(idxd),
+ 0, 0, NULL);
+ if (!idxd->evl_cache) {
+ kfree(evl);
+ return -ENOMEM;
+ }
+
+ idxd->evl = evl;
+ return 0;
+}
+
+static int idxd_setup_internals(struct idxd_device *idxd)
+{
+ struct device *dev = &idxd->pdev->dev;
+ int rc, i;
+
+ init_waitqueue_head(&idxd->cmd_waitq);
+
+ rc = idxd_setup_wqs(idxd);
+ if (rc < 0)
+ goto err_wqs;
+
+ rc = idxd_setup_engines(idxd);
+ if (rc < 0)
+ goto err_engine;
+
+ rc = idxd_setup_groups(idxd);
+ if (rc < 0)
+ goto err_group;
+
+ idxd->wq = create_workqueue(dev_name(dev));
+ if (!idxd->wq) {
+ rc = -ENOMEM;
+ goto err_wkq_create;
+ }
+
+ rc = idxd_init_evl(idxd);
+ if (rc < 0)
+ goto err_evl;
+
+ return 0;
+
+ err_evl:
+ destroy_workqueue(idxd->wq);
+ err_wkq_create:
+ for (i = 0; i < idxd->max_groups; i++)
+ put_device(group_confdev(idxd->groups[i]));
+ err_group:
+ for (i = 0; i < idxd->max_engines; i++)
+ put_device(engine_confdev(idxd->engines[i]));
+ err_engine:
+ for (i = 0; i < idxd->max_wqs; i++)
+ put_device(wq_confdev(idxd->wqs[i]));
+ err_wqs:
+ return rc;
+}
+
+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 * IDXD_TABLE_MULT;
+ dev_dbg(dev, "IDXD Group Config Offset: %#x\n", idxd->grpcfg_offset);
+ idxd->wqcfg_offset = offsets.wqcfg * IDXD_TABLE_MULT;
+ dev_dbg(dev, "IDXD Work Queue Config Offset: %#x\n", idxd->wqcfg_offset);
+ idxd->msix_perm_offset = offsets.msix_perm * IDXD_TABLE_MULT;
+ dev_dbg(dev, "IDXD MSIX Permission Offset: %#x\n", idxd->msix_perm_offset);
+ idxd->perfmon_offset = offsets.perfmon * IDXD_TABLE_MULT;
+ dev_dbg(dev, "IDXD Perfmon Offset: %#x\n", idxd->perfmon_offset);
+}
+
+void multi_u64_to_bmap(unsigned long *bmap, u64 *val, int count)
+{
+ int i, j, nr;
+
+ for (i = 0, nr = 0; i < count; i++) {
+ for (j = 0; j < BITS_PER_LONG_LONG; j++) {
+ if (val[i] & BIT(j))
+ set_bit(nr, bmap);
+ nr++;
+ }
+ }
+}
+
+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);
+
+ if (idxd->hw.gen_cap.cmd_cap) {
+ idxd->hw.cmd_cap = ioread32(idxd->reg_base + IDXD_CMDCAP_OFFSET);
+ dev_dbg(dev, "cmd_cap: %#x\n", idxd->hw.cmd_cap);
+ }
+
+ /* reading command capabilities */
+ if (idxd->hw.cmd_cap & BIT(IDXD_CMD_REQUEST_INT_HANDLE))
+ idxd->request_int_handles = true;
+
+ 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_set_max_batch_size(idxd->data->type, idxd, 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_rdbufs = idxd->hw.group_cap.total_rdbufs;
+ dev_dbg(dev, "max read buffers: %u\n", idxd->max_rdbufs);
+ idxd->nr_rdbufs = idxd->max_rdbufs;
+
+ /* 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);
+ idxd->wqcfg_size = 1 << (idxd->hw.wq_cap.wqcfg_size + IDXD_WQCFG_MIN);
+ dev_dbg(dev, "wqcfg size: %u\n", idxd->wqcfg_size);
+
+ /* 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]);
+ }
+ multi_u64_to_bmap(idxd->opcap_bmap, &idxd->hw.opcap.bits[0], 4);
+
+ /* read iaa cap */
+ if (idxd->data->type == IDXD_TYPE_IAX && idxd->hw.version >= DEVICE_VERSION_2)
+ idxd->hw.iaa_cap.bits = ioread64(idxd->reg_base + IDXD_IAACAP_OFFSET);
+}
+
+static struct idxd_device *idxd_alloc(struct pci_dev *pdev, struct idxd_driver_data *data)
+{
+ struct device *dev = &pdev->dev;
+ struct device *conf_dev;
+ struct idxd_device *idxd;
+ int rc;
+
+ idxd = kzalloc_node(sizeof(*idxd), GFP_KERNEL, dev_to_node(dev));
+ if (!idxd)
+ return NULL;
+
+ conf_dev = idxd_confdev(idxd);
+ idxd->pdev = pdev;
+ idxd->data = data;
+ idxd_dev_set_type(&idxd->idxd_dev, idxd->data->type);
+ idxd->id = ida_alloc(&idxd_ida, GFP_KERNEL);
+ if (idxd->id < 0)
+ return NULL;
+
+ idxd->opcap_bmap = bitmap_zalloc_node(IDXD_MAX_OPCAP_BITS, GFP_KERNEL, dev_to_node(dev));
+ if (!idxd->opcap_bmap) {
+ ida_free(&idxd_ida, idxd->id);
+ return NULL;
+ }
+
+ device_initialize(conf_dev);
+ conf_dev->parent = dev;
+ conf_dev->bus = &dsa_bus_type;
+ conf_dev->type = idxd->data->dev_type;
+ rc = dev_set_name(conf_dev, "%s%d", idxd->data->name_prefix, idxd->id);
+ if (rc < 0) {
+ put_device(conf_dev);
+ return NULL;
+ }
+
+ spin_lock_init(&idxd->dev_lock);
+ spin_lock_init(&idxd->cmd_lock);
+
+ return idxd;
+}
+
+static int idxd_enable_system_pasid(struct idxd_device *idxd)
+{
+ struct pci_dev *pdev = idxd->pdev;
+ struct device *dev = &pdev->dev;
+ struct iommu_domain *domain;
+ ioasid_t pasid;
+ int ret;
+
+ /*
+ * Attach a global PASID to the DMA domain so that we can use ENQCMDS
+ * to submit work on buffers mapped by DMA API.
+ */
+ domain = iommu_get_domain_for_dev(dev);
+ if (!domain)
+ return -EPERM;
+
+ pasid = iommu_alloc_global_pasid(dev);
+ if (pasid == IOMMU_PASID_INVALID)
+ return -ENOSPC;
+
+ /*
+ * DMA domain is owned by the driver, it should support all valid
+ * types such as DMA-FQ, identity, etc.
+ */
+ ret = iommu_attach_device_pasid(domain, dev, pasid);
+ if (ret) {
+ dev_err(dev, "failed to attach device pasid %d, domain type %d",
+ pasid, domain->type);
+ iommu_free_global_pasid(pasid);
+ return ret;
+ }
+
+ /* Since we set user privilege for kernel DMA, enable completion IRQ */
+ idxd_set_user_intr(idxd, 1);
+ idxd->pasid = pasid;
+
+ return ret;
+}
+
+static void idxd_disable_system_pasid(struct idxd_device *idxd)
+{
+ struct pci_dev *pdev = idxd->pdev;
+ struct device *dev = &pdev->dev;
+ struct iommu_domain *domain;
+
+ domain = iommu_get_domain_for_dev(dev);
+ if (!domain)
+ return;
+
+ iommu_detach_device_pasid(domain, dev, idxd->pasid);
+ iommu_free_global_pasid(idxd->pasid);
+
+ idxd_set_user_intr(idxd, 0);
+ idxd->sva = NULL;
+ idxd->pasid = IOMMU_PASID_INVALID;
+}
+
+static int idxd_enable_sva(struct pci_dev *pdev)
+{
+ int ret;
+
+ ret = iommu_dev_enable_feature(&pdev->dev, IOMMU_DEV_FEAT_IOPF);
+ if (ret)
+ return ret;
+
+ ret = iommu_dev_enable_feature(&pdev->dev, IOMMU_DEV_FEAT_SVA);
+ if (ret)
+ iommu_dev_disable_feature(&pdev->dev, IOMMU_DEV_FEAT_IOPF);
+
+ return ret;
+}
+
+static void idxd_disable_sva(struct pci_dev *pdev)
+{
+ iommu_dev_disable_feature(&pdev->dev, IOMMU_DEV_FEAT_SVA);
+ iommu_dev_disable_feature(&pdev->dev, IOMMU_DEV_FEAT_IOPF);
+}
+
+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_init_reset(idxd);
+ if (rc < 0)
+ return rc;
+
+ dev_dbg(dev, "IDXD reset complete\n");
+
+ if (IS_ENABLED(CONFIG_INTEL_IDXD_SVM) && sva) {
+ if (idxd_enable_sva(pdev)) {
+ dev_warn(dev, "Unable to turn on user SVA feature.\n");
+ } else {
+ set_bit(IDXD_FLAG_USER_PASID_ENABLED, &idxd->flags);
+
+ rc = idxd_enable_system_pasid(idxd);
+ if (rc)
+ dev_warn(dev, "No in-kernel DMA with PASID. %d\n", rc);
+ else
+ set_bit(IDXD_FLAG_PASID_ENABLED, &idxd->flags);
+ }
+ } else if (!sva) {
+ dev_warn(dev, "User forced SVA off via module param.\n");
+ }
+
+ idxd_read_caps(idxd);
+ idxd_read_table_offsets(idxd);
+
+ rc = idxd_setup_internals(idxd);
+ if (rc)
+ goto err;
+
+ /* If the configs are readonly, then load them from device */
+ if (!test_bit(IDXD_FLAG_CONFIGURABLE, &idxd->flags)) {
+ dev_dbg(dev, "Loading RO device config\n");
+ rc = idxd_device_load_config(idxd);
+ if (rc < 0)
+ goto err_config;
+ }
+
+ rc = idxd_setup_interrupts(idxd);
+ if (rc)
+ goto err_config;
+
+ idxd->major = idxd_cdev_get_major(idxd);
+
+ rc = perfmon_pmu_init(idxd);
+ if (rc < 0)
+ dev_warn(dev, "Failed to initialize perfmon. No PMU support: %d\n", rc);
+
+ dev_dbg(dev, "IDXD device %d probed successfully\n", idxd->id);
+ return 0;
+
+ err_config:
+ idxd_cleanup_internals(idxd);
+ err:
+ if (device_pasid_enabled(idxd))
+ idxd_disable_system_pasid(idxd);
+ if (device_user_pasid_enabled(idxd))
+ idxd_disable_sva(pdev);
+ return rc;
+}
+
+static void idxd_cleanup(struct idxd_device *idxd)
+{
+ perfmon_pmu_remove(idxd);
+ idxd_cleanup_interrupts(idxd);
+ idxd_cleanup_internals(idxd);
+ if (device_pasid_enabled(idxd))
+ idxd_disable_system_pasid(idxd);
+ if (device_user_pasid_enabled(idxd))
+ idxd_disable_sva(idxd->pdev);
+}
+
+static int idxd_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
+{
+ struct device *dev = &pdev->dev;
+ struct idxd_device *idxd;
+ struct idxd_driver_data *data = (struct idxd_driver_data *)id->driver_data;
+ int rc;
+
+ rc = pci_enable_device(pdev);
+ if (rc)
+ return rc;
+
+ dev_dbg(dev, "Alloc IDXD context\n");
+ idxd = idxd_alloc(pdev, data);
+ if (!idxd) {
+ rc = -ENOMEM;
+ goto err_idxd_alloc;
+ }
+
+ dev_dbg(dev, "Mapping BARs\n");
+ idxd->reg_base = pci_iomap(pdev, IDXD_MMIO_BAR, 0);
+ if (!idxd->reg_base) {
+ rc = -ENOMEM;
+ goto err_iomap;
+ }
+
+ dev_dbg(dev, "Set DMA masks\n");
+ rc = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
+ if (rc)
+ goto err;
+
+ 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");
+ goto err;
+ }
+
+ rc = idxd_register_devices(idxd);
+ if (rc) {
+ dev_err(dev, "IDXD sysfs setup failed\n");
+ goto err_dev_register;
+ }
+
+ rc = idxd_device_init_debugfs(idxd);
+ if (rc)
+ dev_warn(dev, "IDXD debugfs failed to setup\n");
+
+ dev_info(&pdev->dev, "Intel(R) Accelerator Device (v%x)\n",
+ idxd->hw.version);
+
+ return 0;
+
+ err_dev_register:
+ idxd_cleanup(idxd);
+ err:
+ pci_iounmap(pdev, idxd->reg_base);
+ err_iomap:
+ put_device(idxd_confdev(idxd));
+ err_idxd_alloc:
+ pci_disable_device(pdev);
+ return rc;
+}
+
+void idxd_wqs_quiesce(struct idxd_device *idxd)
+{
+ struct idxd_wq *wq;
+ int i;
+
+ for (i = 0; i < idxd->max_wqs; i++) {
+ wq = idxd->wqs[i];
+ if (wq->state == IDXD_WQ_ENABLED && wq->type == IDXD_WQT_KERNEL)
+ idxd_wq_quiesce(wq);
+ }
+}
+
+static void idxd_shutdown(struct pci_dev *pdev)
+{
+ struct idxd_device *idxd = pci_get_drvdata(pdev);
+ struct idxd_irq_entry *irq_entry;
+ int rc;
+
+ rc = idxd_device_disable(idxd);
+ if (rc)
+ dev_err(&pdev->dev, "Disabling device failed\n");
+
+ irq_entry = &idxd->ie;
+ synchronize_irq(irq_entry->vector);
+ idxd_mask_error_interrupts(idxd);
+ flush_workqueue(idxd->wq);
+}
+
+static void idxd_remove(struct pci_dev *pdev)
+{
+ struct idxd_device *idxd = pci_get_drvdata(pdev);
+ struct idxd_irq_entry *irq_entry;
+
+ idxd_unregister_devices(idxd);
+ /*
+ * When ->release() is called for the idxd->conf_dev, it frees all the memory related
+ * to the idxd context. The driver still needs those bits in order to do the rest of
+ * the cleanup. However, we do need to unbound the idxd sub-driver. So take a ref
+ * on the device here to hold off the freeing while allowing the idxd sub-driver
+ * to unbind.
+ */
+ get_device(idxd_confdev(idxd));
+ device_unregister(idxd_confdev(idxd));
+ idxd_shutdown(pdev);
+ if (device_pasid_enabled(idxd))
+ idxd_disable_system_pasid(idxd);
+ idxd_device_remove_debugfs(idxd);
+
+ irq_entry = idxd_get_ie(idxd, 0);
+ free_irq(irq_entry->vector, irq_entry);
+ pci_free_irq_vectors(pdev);
+ pci_iounmap(pdev, idxd->reg_base);
+ if (device_user_pasid_enabled(idxd))
+ idxd_disable_sva(pdev);
+ pci_disable_device(pdev);
+ destroy_workqueue(idxd->wq);
+ perfmon_pmu_remove(idxd);
+ put_device(idxd_confdev(idxd));
+}
+
+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;
+
+ /*
+ * If the CPU does not support MOVDIR64B or ENQCMDS, there's no point in
+ * enumerating the device. We can not utilize it.
+ */
+ if (!cpu_feature_enabled(X86_FEATURE_MOVDIR64B)) {
+ pr_warn("idxd driver failed to load without MOVDIR64B.\n");
+ return -ENODEV;
+ }
+
+ if (!cpu_feature_enabled(X86_FEATURE_ENQCMD))
+ pr_warn("Platform does not have ENQCMD(S) support.\n");
+ else
+ support_enqcmd = true;
+
+ perfmon_init();
+
+ err = idxd_driver_register(&idxd_drv);
+ if (err < 0)
+ goto err_idxd_driver_register;
+
+ err = idxd_driver_register(&idxd_dmaengine_drv);
+ if (err < 0)
+ goto err_idxd_dmaengine_driver_register;
+
+ err = idxd_driver_register(&idxd_user_drv);
+ if (err < 0)
+ goto err_idxd_user_driver_register;
+
+ err = idxd_cdev_register();
+ if (err)
+ goto err_cdev_register;
+
+ err = idxd_init_debugfs();
+ if (err)
+ goto err_debugfs;
+
+ err = pci_register_driver(&idxd_pci_driver);
+ if (err)
+ goto err_pci_register;
+
+ return 0;
+
+err_pci_register:
+ idxd_remove_debugfs();
+err_debugfs:
+ idxd_cdev_remove();
+err_cdev_register:
+ idxd_driver_unregister(&idxd_user_drv);
+err_idxd_user_driver_register:
+ idxd_driver_unregister(&idxd_dmaengine_drv);
+err_idxd_dmaengine_driver_register:
+ idxd_driver_unregister(&idxd_drv);
+err_idxd_driver_register:
+ return err;
+}
+module_init(idxd_init_module);
+
+static void __exit idxd_exit_module(void)
+{
+ idxd_driver_unregister(&idxd_user_drv);
+ idxd_driver_unregister(&idxd_dmaengine_drv);
+ idxd_driver_unregister(&idxd_drv);
+ pci_unregister_driver(&idxd_pci_driver);
+ idxd_cdev_remove();
+ perfmon_exit();
+ idxd_remove_debugfs();
+}
+module_exit(idxd_exit_module);