Quelle  idpf_main.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0-only
/* Copyright (C) 2023 Intel Corporation */

#include "idpf.h"
#include "idpf_devids.h"
#include "idpf_virtchnl.h"

#define DRV_SUMMARY "Intel(R) Infrastructure Data Path Function Linux Driver"

MODULE_DESCRIPTION(DRV_SUMMARY);
MODULE_IMPORT_NS("LIBETH");
MODULE_LICENSE("GPL");

/**
 * idpf_remove - Device removal routine
 * @pdev: PCI device information struct
 */
static void idpf_remove(struct pci_dev *pdev)
{
 struct idpf_adapter *adapter = pci_get_drvdata(pdev);
 int i;

 set_bit(IDPF_REMOVE_IN_PROG, adapter->flags);

 /* Wait until vc_event_task is done to consider if any hard reset is
 * in progress else we may go ahead and release the resources but the
 * thread doing the hard reset might continue the init path and
 * end up in bad state.
 */
 cancel_delayed_work_sync(&adapter->vc_event_task);
 if (adapter->num_vfs)
  idpf_sriov_configure(pdev, 0);

 idpf_vc_core_deinit(adapter);

 /* Be a good citizen and leave the device clean on exit */
 adapter->dev_ops.reg_ops.trigger_reset(adapter, IDPF_HR_FUNC_RESET);
 idpf_deinit_dflt_mbx(adapter);

 if (!adapter->netdevs)
  goto destroy_wqs;

 /* There are some cases where it's possible to still have netdevs
 * registered with the stack at this point, e.g. if the driver detected
 * a HW reset and rmmod is called before it fully recovers. Unregister
 * any stale netdevs here.
 */
 for (i = 0; i < adapter->max_vports; i++) {
  if (!adapter->netdevs[i])
   continue;
  if (adapter->netdevs[i]->reg_state != NETREG_UNINITIALIZED)
   unregister_netdev(adapter->netdevs[i]);
  free_netdev(adapter->netdevs[i]);
  adapter->netdevs[i] = NULL;
 }

destroy_wqs:
 destroy_workqueue(adapter->init_wq);
 destroy_workqueue(adapter->serv_wq);
 destroy_workqueue(adapter->mbx_wq);
 destroy_workqueue(adapter->stats_wq);
 destroy_workqueue(adapter->vc_event_wq);

 for (i = 0; i < adapter->max_vports; i++) {
  kfree(adapter->vport_config[i]->user_config.q_coalesce);
  kfree(adapter->vport_config[i]);
  adapter->vport_config[i] = NULL;
 }
 kfree(adapter->vport_config);
 adapter->vport_config = NULL;
 kfree(adapter->netdevs);
 adapter->netdevs = NULL;
 kfree(adapter->vcxn_mngr);
 adapter->vcxn_mngr = NULL;

 mutex_destroy(&adapter->vport_ctrl_lock);
 mutex_destroy(&adapter->vector_lock);
 mutex_destroy(&adapter->queue_lock);
 mutex_destroy(&adapter->vc_buf_lock);

 pci_set_drvdata(pdev, NULL);
 kfree(adapter);
}

/**
 * idpf_shutdown - PCI callback for shutting down device
 * @pdev: PCI device information struct
 */
static void idpf_shutdown(struct pci_dev *pdev)
{
 struct idpf_adapter *adapter = pci_get_drvdata(pdev);

 cancel_delayed_work_sync(&adapter->serv_task);
 cancel_delayed_work_sync(&adapter->vc_event_task);
 idpf_vc_core_deinit(adapter);
 idpf_deinit_dflt_mbx(adapter);

 if (system_state == SYSTEM_POWER_OFF)
  pci_set_power_state(pdev, PCI_D3hot);
}

/**
 * idpf_cfg_hw - Initialize HW struct
 * @adapter: adapter to setup hw struct for
 *
 * Returns 0 on success, negative on failure
 */
static int idpf_cfg_hw(struct idpf_adapter *adapter)
{
 resource_size_t res_start, mbx_start, rstat_start;
 struct pci_dev *pdev = adapter->pdev;
 struct idpf_hw *hw = &adapter->hw;
 struct device *dev = &pdev->dev;
 long len;

 res_start = pci_resource_start(pdev, 0);

 /* Map mailbox space for virtchnl communication */
 mbx_start = res_start + adapter->dev_ops.static_reg_info[0].start;
 len = resource_size(&adapter->dev_ops.static_reg_info[0]);
 hw->mbx.vaddr = devm_ioremap(dev, mbx_start, len);
 if (!hw->mbx.vaddr) {
  pci_err(pdev, "failed to allocate BAR0 mbx region\n");

  return -ENOMEM;
 }
 hw->mbx.addr_start = adapter->dev_ops.static_reg_info[0].start;
 hw->mbx.addr_len = len;

 /* Map rstat space for resets */
 rstat_start = res_start + adapter->dev_ops.static_reg_info[1].start;
 len = resource_size(&adapter->dev_ops.static_reg_info[1]);
 hw->rstat.vaddr = devm_ioremap(dev, rstat_start, len);
 if (!hw->rstat.vaddr) {
  pci_err(pdev, "failed to allocate BAR0 rstat region\n");

  return -ENOMEM;
 }
 hw->rstat.addr_start = adapter->dev_ops.static_reg_info[1].start;
 hw->rstat.addr_len = len;

 hw->back = adapter;

 return 0;
}

/**
 * idpf_probe - Device initialization routine
 * @pdev: PCI device information struct
 * @ent: entry in idpf_pci_tbl
 *
 * Returns 0 on success, negative on failure
 */
static int idpf_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
{
 struct device *dev = &pdev->dev;
 struct idpf_adapter *adapter;
 int err;

 adapter = kzalloc(sizeof(*adapter), GFP_KERNEL);
 if (!adapter)
  return -ENOMEM;

 adapter->req_tx_splitq = true;
 adapter->req_rx_splitq = true;

 switch (ent->device) {
 case IDPF_DEV_ID_PF:
  idpf_dev_ops_init(adapter);
  break;
 case IDPF_DEV_ID_VF:
  idpf_vf_dev_ops_init(adapter);
  adapter->crc_enable = true;
  break;
 default:
  err = -ENODEV;
  dev_err(&pdev->dev, "Unexpected dev ID 0x%x in idpf probe\n",
   ent->device);
  goto err_free;
 }

 adapter->pdev = pdev;
 err = pcim_enable_device(pdev);
 if (err)
  goto err_free;

 err = pcim_request_region(pdev, 0, pci_name(pdev));
 if (err) {
  pci_err(pdev, "pcim_request_region failed %pe\n", ERR_PTR(err));

  goto err_free;
 }

 err = pci_enable_ptm(pdev, NULL);
 if (err)
  pci_dbg(pdev, "PCIe PTM is not supported by PCIe bus/controller\n");

 /* set up for high or low dma */
 err = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(64));
 if (err) {
  pci_err(pdev, "DMA configuration failed: %pe\n", ERR_PTR(err));

  goto err_free;
 }

 pci_set_master(pdev);
 pci_set_drvdata(pdev, adapter);

 adapter->init_wq = alloc_workqueue("%s-%s-init",
        WQ_UNBOUND | WQ_MEM_RECLAIM, 0,
        dev_driver_string(dev),
        dev_name(dev));
 if (!adapter->init_wq) {
  dev_err(dev, "Failed to allocate init workqueue\n");
  err = -ENOMEM;
  goto err_free;
 }

 adapter->serv_wq = alloc_workqueue("%s-%s-service",
        WQ_UNBOUND | WQ_MEM_RECLAIM, 0,
        dev_driver_string(dev),
        dev_name(dev));
 if (!adapter->serv_wq) {
  dev_err(dev, "Failed to allocate service workqueue\n");
  err = -ENOMEM;
  goto err_serv_wq_alloc;
 }

 adapter->mbx_wq = alloc_workqueue("%s-%s-mbx", WQ_UNBOUND | WQ_HIGHPRI,
       0, dev_driver_string(dev),
       dev_name(dev));
 if (!adapter->mbx_wq) {
  dev_err(dev, "Failed to allocate mailbox workqueue\n");
  err = -ENOMEM;
  goto err_mbx_wq_alloc;
 }

 adapter->stats_wq = alloc_workqueue("%s-%s-stats",
         WQ_UNBOUND | WQ_MEM_RECLAIM, 0,
         dev_driver_string(dev),
         dev_name(dev));
 if (!adapter->stats_wq) {
  dev_err(dev, "Failed to allocate workqueue\n");
  err = -ENOMEM;
  goto err_stats_wq_alloc;
 }

 adapter->vc_event_wq = alloc_workqueue("%s-%s-vc_event",
            WQ_UNBOUND | WQ_MEM_RECLAIM, 0,
            dev_driver_string(dev),
            dev_name(dev));
 if (!adapter->vc_event_wq) {
  dev_err(dev, "Failed to allocate virtchnl event workqueue\n");
  err = -ENOMEM;
  goto err_vc_event_wq_alloc;
 }

 /* setup msglvl */
 adapter->msg_enable = netif_msg_init(-1, IDPF_AVAIL_NETIF_M);

 err = idpf_cfg_hw(adapter);
 if (err) {
  dev_err(dev, "Failed to configure HW structure for adapter: %d\n",
   err);
  goto err_cfg_hw;
 }

 mutex_init(&adapter->vport_ctrl_lock);
 mutex_init(&adapter->vector_lock);
 mutex_init(&adapter->queue_lock);
 mutex_init(&adapter->vc_buf_lock);

 INIT_DELAYED_WORK(&adapter->init_task, idpf_init_task);
 INIT_DELAYED_WORK(&adapter->serv_task, idpf_service_task);
 INIT_DELAYED_WORK(&adapter->mbx_task, idpf_mbx_task);
 INIT_DELAYED_WORK(&adapter->stats_task, idpf_statistics_task);
 INIT_DELAYED_WORK(&adapter->vc_event_task, idpf_vc_event_task);

 adapter->dev_ops.reg_ops.reset_reg_init(adapter);
 set_bit(IDPF_HR_DRV_LOAD, adapter->flags);
 queue_delayed_work(adapter->vc_event_wq, &adapter->vc_event_task,
      msecs_to_jiffies(10 * (pdev->devfn & 0x07)));

 return 0;

err_cfg_hw:
 destroy_workqueue(adapter->vc_event_wq);
err_vc_event_wq_alloc:
 destroy_workqueue(adapter->stats_wq);
err_stats_wq_alloc:
 destroy_workqueue(adapter->mbx_wq);
err_mbx_wq_alloc:
 destroy_workqueue(adapter->serv_wq);
err_serv_wq_alloc:
 destroy_workqueue(adapter->init_wq);
err_free:
 kfree(adapter);
 return err;
}

/* idpf_pci_tbl - PCI Dev idpf ID Table
 */
static const struct pci_device_id idpf_pci_tbl[] = {
 { PCI_VDEVICE(INTEL, IDPF_DEV_ID_PF)},
 { PCI_VDEVICE(INTEL, IDPF_DEV_ID_VF)},
 { /* Sentinel */ }
};
MODULE_DEVICE_TABLE(pci, idpf_pci_tbl);

static struct pci_driver idpf_driver = {
 .name   = KBUILD_MODNAME,
 .id_table  = idpf_pci_tbl,
 .probe   = idpf_probe,
 .sriov_configure = idpf_sriov_configure,
 .remove   = idpf_remove,
 .shutdown  = idpf_shutdown,
};
module_pci_driver(idpf_driver);