RDMA/efa: Add the efa module

Add the main EFA module file which takes care of device
probe/initialization/registration/etc.
Signed-off-by: NGal Pressman <galpress@amazon.com>
Reviewed-by: NShiraz Saleem <shiraz.saleem@intel.com>
Reviewed-by: NSteve Wise <swise@opengridcomputing.com>
Signed-off-by: NJason Gunthorpe <jgg@mellanox.com>

drivers/infiniband/hw/efa/efa_main.c

+// SPDX-License-Identifier: GPL-2.0 OR BSD-2-Clause
+/*
+ * Copyright 2018-2019 Amazon.com, Inc. or its affiliates. All rights reserved.
+ */
+
+#include <linux/module.h>
+#include <linux/pci.h>
+
+#include <rdma/ib_user_verbs.h>
+
+#include "efa.h"
+
+#define PCI_DEV_ID_EFA_VF 0xefa0
+
+static const struct pci_device_id efa_pci_tbl[] = {
+	{ PCI_VDEVICE(AMAZON, PCI_DEV_ID_EFA_VF) },
+	{ }
+};
+
+MODULE_AUTHOR("Amazon.com, Inc. or its affiliates");
+MODULE_LICENSE("Dual BSD/GPL");
+MODULE_DESCRIPTION(DEVICE_NAME);
+MODULE_DEVICE_TABLE(pci, efa_pci_tbl);
+
+#define EFA_REG_BAR 0
+#define EFA_MEM_BAR 2
+#define EFA_BASE_BAR_MASK (BIT(EFA_REG_BAR) | BIT(EFA_MEM_BAR))
+
+#define EFA_AENQ_ENABLED_GROUPS \
+	(BIT(EFA_ADMIN_FATAL_ERROR) | BIT(EFA_ADMIN_WARNING) | \
+	 BIT(EFA_ADMIN_NOTIFICATION) | BIT(EFA_ADMIN_KEEP_ALIVE))
+
+static void efa_update_network_attr(struct efa_dev *dev,
+				    struct efa_com_get_network_attr_result *network_attr)
+{
+	memcpy(dev->addr, network_attr->addr, sizeof(network_attr->addr));
+	dev->mtu = network_attr->mtu;
+
+	dev_dbg(&dev->pdev->dev, "Full address %pI6\n", dev->addr);
+}
+
+/* This handler will called for unknown event group or unimplemented handlers */
+static void unimplemented_aenq_handler(void *data,
+				       struct efa_admin_aenq_entry *aenq_e)
+{
+	struct efa_dev *dev = (struct efa_dev *)data;
+
+	ibdev_err(&dev->ibdev,
+		  "Unknown event was received or event with unimplemented handler\n");
+}
+
+static void efa_keep_alive(void *data, struct efa_admin_aenq_entry *aenq_e)
+{
+	struct efa_dev *dev = (struct efa_dev *)data;
+
+	atomic64_inc(&dev->stats.keep_alive_rcvd);
+}
+
+static struct efa_aenq_handlers aenq_handlers = {
+	.handlers = {
+		[EFA_ADMIN_KEEP_ALIVE] = efa_keep_alive,
+	},
+	.unimplemented_handler = unimplemented_aenq_handler
+};
+
+static void efa_release_bars(struct efa_dev *dev, int bars_mask)
+{
+	struct pci_dev *pdev = dev->pdev;
+	int release_bars;
+
+	release_bars = pci_select_bars(pdev, IORESOURCE_MEM) & bars_mask;
+	pci_release_selected_regions(pdev, release_bars);
+}
+
+static irqreturn_t efa_intr_msix_mgmnt(int irq, void *data)
+{
+	struct efa_dev *dev = data;
+
+	efa_com_admin_q_comp_intr_handler(&dev->edev);
+	efa_com_aenq_intr_handler(&dev->edev, data);
+
+	return IRQ_HANDLED;
+}
+
+static int efa_request_mgmnt_irq(struct efa_dev *dev)
+{
+	struct efa_irq *irq;
+	int err;
+
+	irq = &dev->admin_irq;
+	err = request_irq(irq->vector, irq->handler, 0, irq->name,
+			  irq->data);
+	if (err) {
+		dev_err(&dev->pdev->dev, "Failed to request admin irq (%d)\n",
+			err);
+		return err;
+	}
+
+	dev_dbg(&dev->pdev->dev, "Set affinity hint of mgmnt irq to %*pbl (irq vector: %d)\n",
+		nr_cpumask_bits, &irq->affinity_hint_mask, irq->vector);
+	irq_set_affinity_hint(irq->vector, &irq->affinity_hint_mask);
+
+	return err;
+}
+
+static void efa_setup_mgmnt_irq(struct efa_dev *dev)
+{
+	u32 cpu;
+
+	snprintf(dev->admin_irq.name, EFA_IRQNAME_SIZE,
+		 "efa-mgmnt@pci:%s", pci_name(dev->pdev));
+	dev->admin_irq.handler = efa_intr_msix_mgmnt;
+	dev->admin_irq.data = dev;
+	dev->admin_irq.vector =
+		pci_irq_vector(dev->pdev, dev->admin_msix_vector_idx);
+	cpu = cpumask_first(cpu_online_mask);
+	dev->admin_irq.cpu = cpu;
+	cpumask_set_cpu(cpu,
+			&dev->admin_irq.affinity_hint_mask);
+	dev_info(&dev->pdev->dev, "Setup irq:0x%p vector:%d name:%s\n",
+		 &dev->admin_irq,
+		 dev->admin_irq.vector,
+		 dev->admin_irq.name);
+}
+
+static void efa_free_mgmnt_irq(struct efa_dev *dev)
+{
+	struct efa_irq *irq;
+
+	irq = &dev->admin_irq;
+	irq_set_affinity_hint(irq->vector, NULL);
+	free_irq(irq->vector, irq->data);
+}
+
+static int efa_set_mgmnt_irq(struct efa_dev *dev)
+{
+	efa_setup_mgmnt_irq(dev);
+
+	return efa_request_mgmnt_irq(dev);
+}
+
+static int efa_request_doorbell_bar(struct efa_dev *dev)
+{
+	u8 db_bar_idx = dev->dev_attr.db_bar;
+	struct pci_dev *pdev = dev->pdev;
+	int bars;
+	int err;
+
+	if (!(BIT(db_bar_idx) & EFA_BASE_BAR_MASK)) {
+		bars = pci_select_bars(pdev, IORESOURCE_MEM) & BIT(db_bar_idx);
+
+		err = pci_request_selected_regions(pdev, bars, DRV_MODULE_NAME);
+		if (err) {
+			dev_err(&dev->pdev->dev,
+				"pci_request_selected_regions for bar %d failed %d\n",
+				db_bar_idx, err);
+			return err;
+		}
+	}
+
+	dev->db_bar_addr = pci_resource_start(dev->pdev, db_bar_idx);
+	dev->db_bar_len = pci_resource_len(dev->pdev, db_bar_idx);
+
+	return 0;
+}
+
+static void efa_release_doorbell_bar(struct efa_dev *dev)
+{
+	if (!(BIT(dev->dev_attr.db_bar) & EFA_BASE_BAR_MASK))
+		efa_release_bars(dev, BIT(dev->dev_attr.db_bar));
+}
+
+static void efa_update_hw_hints(struct efa_dev *dev,
+				struct efa_com_get_hw_hints_result *hw_hints)
+{
+	struct efa_com_dev *edev = &dev->edev;
+
+	if (hw_hints->mmio_read_timeout)
+		edev->mmio_read.mmio_read_timeout =
+			hw_hints->mmio_read_timeout * 1000;
+
+	if (hw_hints->poll_interval)
+		edev->aq.poll_interval = hw_hints->poll_interval;
+
+	if (hw_hints->admin_completion_timeout)
+		edev->aq.completion_timeout =
+			hw_hints->admin_completion_timeout;
+}
+
+static void efa_stats_init(struct efa_dev *dev)
+{
+	atomic64_t *s = (atomic64_t *)&dev->stats;
+	int i;
+
+	for (i = 0; i < sizeof(dev->stats) / sizeof(*s); i++, s++)
+		atomic64_set(s, 0);
+}
+
+static const struct ib_device_ops efa_dev_ops = {
+	.alloc_pd = efa_alloc_pd,
+	.alloc_ucontext = efa_alloc_ucontext,
+	.create_ah = efa_create_ah,
+	.create_cq = efa_create_cq,
+	.create_qp = efa_create_qp,
+	.dealloc_pd = efa_dealloc_pd,
+	.dealloc_ucontext = efa_dealloc_ucontext,
+	.dereg_mr = efa_dereg_mr,
+	.destroy_ah = efa_destroy_ah,
+	.destroy_cq = efa_destroy_cq,
+	.destroy_qp = efa_destroy_qp,
+	.get_link_layer = efa_port_link_layer,
+	.get_port_immutable = efa_get_port_immutable,
+	.mmap = efa_mmap,
+	.modify_qp = efa_modify_qp,
+	.query_device = efa_query_device,
+	.query_gid = efa_query_gid,
+	.query_pkey = efa_query_pkey,
+	.query_port = efa_query_port,
+	.query_qp = efa_query_qp,
+	.reg_user_mr = efa_reg_mr,
+
+	INIT_RDMA_OBJ_SIZE(ib_ah, efa_ah, ibah),
+	INIT_RDMA_OBJ_SIZE(ib_pd, efa_pd, ibpd),
+	INIT_RDMA_OBJ_SIZE(ib_ucontext, efa_ucontext, ibucontext),
+};
+
+static int efa_ib_device_add(struct efa_dev *dev)
+{
+	struct efa_com_get_network_attr_result network_attr;
+	struct efa_com_get_hw_hints_result hw_hints;
+	struct pci_dev *pdev = dev->pdev;
+	int err;
+
+	efa_stats_init(dev);
+
+	err = efa_com_get_device_attr(&dev->edev, &dev->dev_attr);
+	if (err)
+		return err;
+
+	dev_dbg(&dev->pdev->dev, "Doorbells bar (%d)\n", dev->dev_attr.db_bar);
+	err = efa_request_doorbell_bar(dev);
+	if (err)
+		return err;
+
+	err = efa_com_get_network_attr(&dev->edev, &network_attr);
+	if (err)
+		goto err_release_doorbell_bar;
+
+	efa_update_network_attr(dev, &network_attr);
+
+	err = efa_com_get_hw_hints(&dev->edev, &hw_hints);
+	if (err)
+		goto err_release_doorbell_bar;
+
+	efa_update_hw_hints(dev, &hw_hints);
+
+	/* Try to enable all the available aenq groups */
+	err = efa_com_set_aenq_config(&dev->edev, EFA_AENQ_ENABLED_GROUPS);
+	if (err)
+		goto err_release_doorbell_bar;
+
+	dev->ibdev.owner = THIS_MODULE;
+	dev->ibdev.node_type = RDMA_NODE_UNSPECIFIED;
+	dev->ibdev.phys_port_cnt = 1;
+	dev->ibdev.num_comp_vectors = 1;
+	dev->ibdev.dev.parent = &pdev->dev;
+	dev->ibdev.uverbs_abi_ver = EFA_UVERBS_ABI_VERSION;
+
+	dev->ibdev.uverbs_cmd_mask =
+		(1ull << IB_USER_VERBS_CMD_GET_CONTEXT) |
+		(1ull << IB_USER_VERBS_CMD_QUERY_DEVICE) |
+		(1ull << IB_USER_VERBS_CMD_QUERY_PORT) |
+		(1ull << IB_USER_VERBS_CMD_ALLOC_PD) |
+		(1ull << IB_USER_VERBS_CMD_DEALLOC_PD) |
+		(1ull << IB_USER_VERBS_CMD_REG_MR) |
+		(1ull << IB_USER_VERBS_CMD_DEREG_MR) |
+		(1ull << IB_USER_VERBS_CMD_CREATE_COMP_CHANNEL) |
+		(1ull << IB_USER_VERBS_CMD_CREATE_CQ) |
+		(1ull << IB_USER_VERBS_CMD_DESTROY_CQ) |
+		(1ull << IB_USER_VERBS_CMD_CREATE_QP) |
+		(1ull << IB_USER_VERBS_CMD_MODIFY_QP) |
+		(1ull << IB_USER_VERBS_CMD_QUERY_QP) |
+		(1ull << IB_USER_VERBS_CMD_DESTROY_QP) |
+		(1ull << IB_USER_VERBS_CMD_CREATE_AH) |
+		(1ull << IB_USER_VERBS_CMD_DESTROY_AH);
+
+	dev->ibdev.uverbs_ex_cmd_mask =
+		(1ull << IB_USER_VERBS_EX_CMD_QUERY_DEVICE);
+
+	dev->ibdev.driver_id = RDMA_DRIVER_EFA;
+	ib_set_device_ops(&dev->ibdev, &efa_dev_ops);
+
+	err = ib_register_device(&dev->ibdev, "efa_%d");
+	if (err)
+		goto err_release_doorbell_bar;
+
+	ibdev_info(&dev->ibdev, "IB device registered\n");
+
+	return 0;
+
+err_release_doorbell_bar:
+	efa_release_doorbell_bar(dev);
+	return err;
+}
+
+static void efa_ib_device_remove(struct efa_dev *dev)
+{
+	efa_com_dev_reset(&dev->edev, EFA_REGS_RESET_NORMAL);
+	ibdev_info(&dev->ibdev, "Unregister ib device\n");
+	ib_unregister_device(&dev->ibdev);
+	efa_release_doorbell_bar(dev);
+}
+
+static void efa_disable_msix(struct efa_dev *dev)
+{
+	pci_free_irq_vectors(dev->pdev);
+}
+
+static int efa_enable_msix(struct efa_dev *dev)
+{
+	int msix_vecs, irq_num;
+
+	/* Reserve the max msix vectors we might need */
+	msix_vecs = EFA_NUM_MSIX_VEC;
+	dev_dbg(&dev->pdev->dev, "Trying to enable MSI-X, vectors %d\n",
+		msix_vecs);
+
+	dev->admin_msix_vector_idx = EFA_MGMNT_MSIX_VEC_IDX;
+	irq_num = pci_alloc_irq_vectors(dev->pdev, msix_vecs,
+					msix_vecs, PCI_IRQ_MSIX);
+
+	if (irq_num < 0) {
+		dev_err(&dev->pdev->dev, "Failed to enable MSI-X. irq_num %d\n",
+			irq_num);
+		return -ENOSPC;
+	}
+
+	if (irq_num != msix_vecs) {
+		dev_err(&dev->pdev->dev,
+			"Allocated %d MSI-X (out of %d requested)\n",
+			irq_num, msix_vecs);
+		return -ENOSPC;
+	}
+
+	return 0;
+}
+
+static int efa_device_init(struct efa_com_dev *edev, struct pci_dev *pdev)
+{
+	int dma_width;
+	int err;
+
+	err = efa_com_dev_reset(edev, EFA_REGS_RESET_NORMAL);
+	if (err)
+		return err;
+
+	err = efa_com_validate_version(edev);
+	if (err)
+		return err;
+
+	dma_width = efa_com_get_dma_width(edev);
+	if (dma_width < 0) {
+		err = dma_width;
+		return err;
+	}
+
+	err = pci_set_dma_mask(pdev, DMA_BIT_MASK(dma_width));
+	if (err) {
+		dev_err(&pdev->dev, "pci_set_dma_mask failed %d\n", err);
+		return err;
+	}
+
+	err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(dma_width));
+	if (err) {
+		dev_err(&pdev->dev,
+			"err_pci_set_consistent_dma_mask failed %d\n",
+			err);
+		return err;
+	}
+
+	return 0;
+}
+
+static struct efa_dev *efa_probe_device(struct pci_dev *pdev)
+{
+	struct efa_com_dev *edev;
+	struct efa_dev *dev;
+	int bars;
+	int err;
+
+	err = pci_enable_device_mem(pdev);
+	if (err) {
+		dev_err(&pdev->dev, "pci_enable_device_mem() failed!\n");
+		return ERR_PTR(err);
+	}
+
+	pci_set_master(pdev);
+
+	dev = ib_alloc_device(efa_dev, ibdev);
+	if (!dev) {
+		dev_err(&pdev->dev, "Device alloc failed\n");
+		err = -ENOMEM;
+		goto err_disable_device;
+	}
+
+	pci_set_drvdata(pdev, dev);
+	edev = &dev->edev;
+	edev->efa_dev = dev;
+	edev->dmadev = &pdev->dev;
+	dev->pdev = pdev;
+
+	bars = pci_select_bars(pdev, IORESOURCE_MEM) & EFA_BASE_BAR_MASK;
+	err = pci_request_selected_regions(pdev, bars, DRV_MODULE_NAME);
+	if (err) {
+		dev_err(&pdev->dev, "pci_request_selected_regions failed %d\n",
+			err);
+		goto err_ibdev_destroy;
+	}
+
+	dev->reg_bar_addr = pci_resource_start(pdev, EFA_REG_BAR);
+	dev->reg_bar_len = pci_resource_len(pdev, EFA_REG_BAR);
+	dev->mem_bar_addr = pci_resource_start(pdev, EFA_MEM_BAR);
+	dev->mem_bar_len = pci_resource_len(pdev, EFA_MEM_BAR);
+
+	edev->reg_bar = devm_ioremap(&pdev->dev,
+				     dev->reg_bar_addr,
+				     dev->reg_bar_len);
+	if (!edev->reg_bar) {
+		dev_err(&pdev->dev, "Failed to remap register bar\n");
+		err = -EFAULT;
+		goto err_release_bars;
+	}
+
+	err = efa_com_mmio_reg_read_init(edev);
+	if (err) {
+		dev_err(&pdev->dev, "Failed to init readless MMIO\n");
+		goto err_iounmap;
+	}
+
+	err = efa_device_init(edev, pdev);
+	if (err) {
+		dev_err(&pdev->dev, "EFA device init failed\n");
+		if (err == -ETIME)
+			err = -EPROBE_DEFER;
+		goto err_reg_read_destroy;
+	}
+
+	err = efa_enable_msix(dev);
+	if (err)
+		goto err_reg_read_destroy;
+
+	edev->aq.msix_vector_idx = dev->admin_msix_vector_idx;
+	edev->aenq.msix_vector_idx = dev->admin_msix_vector_idx;
+
+	err = efa_set_mgmnt_irq(dev);
+	if (err)
+		goto err_disable_msix;
+
+	err = efa_com_admin_init(edev, &aenq_handlers);
+	if (err)
+		goto err_free_mgmnt_irq;
+
+	return dev;
+
+err_free_mgmnt_irq:
+	efa_free_mgmnt_irq(dev);
+err_disable_msix:
+	efa_disable_msix(dev);
+err_reg_read_destroy:
+	efa_com_mmio_reg_read_destroy(edev);
+err_iounmap:
+	devm_iounmap(&pdev->dev, edev->reg_bar);
+err_release_bars:
+	efa_release_bars(dev, EFA_BASE_BAR_MASK);
+err_ibdev_destroy:
+	ib_dealloc_device(&dev->ibdev);
+err_disable_device:
+	pci_disable_device(pdev);
+	return ERR_PTR(err);
+}
+
+static void efa_remove_device(struct pci_dev *pdev)
+{
+	struct efa_dev *dev = pci_get_drvdata(pdev);
+	struct efa_com_dev *edev;
+
+	edev = &dev->edev;
+	efa_com_admin_destroy(edev);
+	efa_free_mgmnt_irq(dev);
+	efa_disable_msix(dev);
+	efa_com_mmio_reg_read_destroy(edev);
+	devm_iounmap(&pdev->dev, edev->reg_bar);
+	efa_release_bars(dev, EFA_BASE_BAR_MASK);
+	ib_dealloc_device(&dev->ibdev);
+	pci_disable_device(pdev);
+}
+
+static int efa_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
+{
+	struct efa_dev *dev;
+	int err;
+
+	dev = efa_probe_device(pdev);
+	if (IS_ERR(dev))
+		return PTR_ERR(dev);
+
+	err = efa_ib_device_add(dev);
+	if (err)
+		goto err_remove_device;
+
+	return 0;
+
+err_remove_device:
+	efa_remove_device(pdev);
+	return err;
+}
+
+static void efa_remove(struct pci_dev *pdev)
+{
+	struct efa_dev *dev = pci_get_drvdata(pdev);
+
+	efa_ib_device_remove(dev);
+	efa_remove_device(pdev);
+}
+
+static struct pci_driver efa_pci_driver = {
+	.name           = DRV_MODULE_NAME,
+	.id_table       = efa_pci_tbl,
+	.probe          = efa_probe,
+	.remove         = efa_remove,
+};
+
+module_pci_driver(efa_pci_driver);