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Commit b7f5e880 authored by Gal Pressman's avatar Gal Pressman Committed by Jason Gunthorpe
Browse files

RDMA/efa: Add the efa module 



Add the main EFA module file which takes care of device
probe/initialization/registration/etc.

Signed-off-by: default avatarGal Pressman <galpress@amazon.com>
Reviewed-by: default avatarShiraz Saleem <shiraz.saleem@intel.com>
Reviewed-by: default avatarSteve Wise <swise@opengridcomputing.com>
Signed-off-by: default avatarJason Gunthorpe <jgg@mellanox.com>
parent 40909f66

drivers/infiniband/hw/efa/efa_main.c

0 → 100644
+533 −0
Original line number Diff line number Diff line 
// 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);