drivers/crypto/qat/qat_common/adf_sriov.c

   1 // SPDX-License-Identifier: (BSD-3-Clause OR GPL-2.0-only)
   2 /* Copyright(c) 2015 - 2020 Intel Corporation */
   3 #include <linux/workqueue.h>
   4 #include <linux/pci.h>
   5 #include <linux/device.h>
   6 #include <linux/iommu.h>
   7 #include "adf_common_drv.h"
   8 #include "adf_cfg.h"
   9 #include "adf_pf2vf_msg.h"
  10
  11 static struct workqueue_struct *pf2vf_resp_wq;
  12
  13 struct adf_pf2vf_resp {
  14         struct work_struct pf2vf_resp_work;
  15         struct adf_accel_vf_info *vf_info;
  16 };
  17
  18 static void adf_iov_send_resp(struct work_struct *work)
  19 {
  20         struct adf_pf2vf_resp *pf2vf_resp =
  21                 container_of(work, struct adf_pf2vf_resp, pf2vf_resp_work);
  22
  23         adf_vf2pf_req_hndl(pf2vf_resp->vf_info);
  24         kfree(pf2vf_resp);
  25 }
  26
  27 static void adf_vf2pf_bh_handler(void *data)
  28 {
  29         struct adf_accel_vf_info *vf_info = (struct adf_accel_vf_info *)data;
  30         struct adf_pf2vf_resp *pf2vf_resp;
  31
  32         pf2vf_resp = kzalloc(sizeof(*pf2vf_resp), GFP_ATOMIC);
  33         if (!pf2vf_resp)
  34                 return;
  35
  36         pf2vf_resp->vf_info = vf_info;
  37         INIT_WORK(&pf2vf_resp->pf2vf_resp_work, adf_iov_send_resp);
  38         queue_work(pf2vf_resp_wq, &pf2vf_resp->pf2vf_resp_work);
  39 }
  40
  41 static int adf_enable_sriov(struct adf_accel_dev *accel_dev)
  42 {
  43         struct pci_dev *pdev = accel_to_pci_dev(accel_dev);
  44         int totalvfs = pci_sriov_get_totalvfs(pdev);
  45         struct adf_hw_device_data *hw_data = accel_dev->hw_device;
  46         struct adf_accel_vf_info *vf_info;
  47         int i;
  48
  49         for (i = 0, vf_info = accel_dev->pf.vf_info; i < totalvfs;
  50              i++, vf_info++) {
  51                 /* This ptr will be populated when VFs will be created */
  52                 vf_info->accel_dev = accel_dev;
  53                 vf_info->vf_nr = i;
  54
  55                 tasklet_init(&vf_info->vf2pf_bh_tasklet,
  56                              (void *)adf_vf2pf_bh_handler,
  57                              (unsigned long)vf_info);
  58                 mutex_init(&vf_info->pf2vf_lock);
  59                 ratelimit_state_init(&vf_info->vf2pf_ratelimit,
  60                                      DEFAULT_RATELIMIT_INTERVAL,
  61                                      DEFAULT_RATELIMIT_BURST);
  62         }
  63
  64         /* Set Valid bits in AE Thread to PCIe Function Mapping */
  65         if (hw_data->configure_iov_threads)
  66                 hw_data->configure_iov_threads(accel_dev, true);
  67
  68         /* Enable VF to PF interrupts for all VFs */
  69         if (hw_data->get_pf2vf_offset)
  70                 adf_enable_vf2pf_interrupts(accel_dev, BIT_ULL(totalvfs) - 1);
  71
  72         /*
  73          * Due to the hardware design, when SR-IOV and the ring arbiter
  74          * are enabled all the VFs supported in hardware must be enabled in
  75          * order for all the hardware resources (i.e. bundles) to be usable.
  76          * When SR-IOV is enabled, each of the VFs will own one bundle.
  77          */
  78         return pci_enable_sriov(pdev, totalvfs);
  79 }
  80
  81 /**
  82  * adf_disable_sriov() - Disable SRIOV for the device
  83  * @accel_dev:  Pointer to accel device.
  84  *
  85  * Function disables SRIOV for the accel device.
  86  *
  87  * Return: 0 on success, error code otherwise.
  88  */
  89 void adf_disable_sriov(struct adf_accel_dev *accel_dev)
  90 {
  91         struct adf_hw_device_data *hw_data = accel_dev->hw_device;
  92         int totalvfs = pci_sriov_get_totalvfs(accel_to_pci_dev(accel_dev));
  93         struct adf_accel_vf_info *vf;
  94         int i;
  95
  96         if (!accel_dev->pf.vf_info)
  97                 return;
  98
  99         if (hw_data->get_pf2vf_offset)
 100                 adf_pf2vf_notify_restarting(accel_dev);
 101
 102         pci_disable_sriov(accel_to_pci_dev(accel_dev));
 103
 104         /* Disable VF to PF interrupts */
 105         if (hw_data->get_pf2vf_offset)
 106                 adf_disable_vf2pf_interrupts(accel_dev, GENMASK(31, 0));
 107
 108         /* Clear Valid bits in AE Thread to PCIe Function Mapping */
 109         if (hw_data->configure_iov_threads)
 110                 hw_data->configure_iov_threads(accel_dev, false);
 111
 112         for (i = 0, vf = accel_dev->pf.vf_info; i < totalvfs; i++, vf++) {
 113                 tasklet_disable(&vf->vf2pf_bh_tasklet);
 114                 tasklet_kill(&vf->vf2pf_bh_tasklet);
 115                 mutex_destroy(&vf->pf2vf_lock);
 116         }
 117
 118         kfree(accel_dev->pf.vf_info);
 119         accel_dev->pf.vf_info = NULL;
 120 }
 121 EXPORT_SYMBOL_GPL(adf_disable_sriov);
 122
 123 /**
 124  * adf_sriov_configure() - Enable SRIOV for the device
 125  * @pdev:  Pointer to PCI device.
 126  * @numvfs: Number of virtual functions (VFs) to enable.
 127  *
 128  * Note that the @numvfs parameter is ignored and all VFs supported by the
 129  * device are enabled due to the design of the hardware.
 130  *
 131  * Function enables SRIOV for the PCI device.
 132  *
 133  * Return: number of VFs enabled on success, error code otherwise.
 134  */
 135 int adf_sriov_configure(struct pci_dev *pdev, int numvfs)
 136 {
 137         struct adf_accel_dev *accel_dev = adf_devmgr_pci_to_accel_dev(pdev);
 138         int totalvfs = pci_sriov_get_totalvfs(pdev);
 139         unsigned long val;
 140         int ret;
 141
 142         if (!accel_dev) {
 143                 dev_err(&pdev->dev, "Failed to find accel_dev\n");
 144                 return -EFAULT;
 145         }
 146
 147         if (!iommu_present(&pci_bus_type))
 148                 dev_warn(&pdev->dev, "IOMMU should be enabled for SR-IOV to work correctly\n");
 149
 150         if (accel_dev->pf.vf_info) {
 151                 dev_info(&pdev->dev, "Already enabled for this device\n");
 152                 return -EINVAL;
 153         }
 154
 155         if (adf_dev_started(accel_dev)) {
 156                 if (adf_devmgr_in_reset(accel_dev) ||
 157                     adf_dev_in_use(accel_dev)) {
 158                         dev_err(&GET_DEV(accel_dev), "Device busy\n");
 159                         return -EBUSY;
 160                 }
 161
 162                 adf_dev_stop(accel_dev);
 163                 adf_dev_shutdown(accel_dev);
 164         }
 165
 166         if (adf_cfg_section_add(accel_dev, ADF_KERNEL_SEC))
 167                 return -EFAULT;
 168         val = 0;
 169         if (adf_cfg_add_key_value_param(accel_dev, ADF_KERNEL_SEC,
 170                                         ADF_NUM_CY, (void *)&val, ADF_DEC))
 171                 return -EFAULT;
 172
 173         set_bit(ADF_STATUS_CONFIGURED, &accel_dev->status);
 174
 175         /* Allocate memory for VF info structs */
 176         accel_dev->pf.vf_info = kcalloc(totalvfs,
 177                                         sizeof(struct adf_accel_vf_info),
 178                                         GFP_KERNEL);
 179         if (!accel_dev->pf.vf_info)
 180                 return -ENOMEM;
 181
 182         if (adf_dev_init(accel_dev)) {
 183                 dev_err(&GET_DEV(accel_dev), "Failed to init qat_dev%d\n",
 184                         accel_dev->accel_id);
 185                 return -EFAULT;
 186         }
 187
 188         if (adf_dev_start(accel_dev)) {
 189                 dev_err(&GET_DEV(accel_dev), "Failed to start qat_dev%d\n",
 190                         accel_dev->accel_id);
 191                 return -EFAULT;
 192         }
 193
 194         ret = adf_enable_sriov(accel_dev);
 195         if (ret)
 196                 return ret;
 197
 198         return numvfs;
 199 }
 200 EXPORT_SYMBOL_GPL(adf_sriov_configure);
 201
 202 int __init adf_init_pf_wq(void)
 203 {
 204         /* Workqueue for PF2VF responses */
 205         pf2vf_resp_wq = alloc_workqueue("qat_pf2vf_resp_wq", WQ_MEM_RECLAIM, 0);
 206
 207         return !pf2vf_resp_wq ? -ENOMEM : 0;
 208 }
 209
 210 void adf_exit_pf_wq(void)
 211 {
 212         if (pf2vf_resp_wq) {
 213                 destroy_workqueue(pf2vf_resp_wq);
 214                 pf2vf_resp_wq = NULL;
 215         }
 216 }