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1// SPDX-License-Identifier: (BSD-3-Clause OR GPL-2.0-only)2/* Copyright(c) 2015 - 2021 Intel Corporation */3#include <linux/workqueue.h>4#include <linux/pci.h>5#include <linux/device.h>6#include "adf_common_drv.h"7#include "adf_cfg.h"8#include "adf_pfvf_pf_msg.h"9 10#define ADF_VF2PF_RATELIMIT_INTERVAL 811#define ADF_VF2PF_RATELIMIT_BURST 13012 13static struct workqueue_struct *pf2vf_resp_wq;14 15struct adf_pf2vf_resp {16 struct work_struct pf2vf_resp_work;17 struct adf_accel_vf_info *vf_info;18};19 20static void adf_iov_send_resp(struct work_struct *work)21{22 struct adf_pf2vf_resp *pf2vf_resp =23 container_of(work, struct adf_pf2vf_resp, pf2vf_resp_work);24 struct adf_accel_vf_info *vf_info = pf2vf_resp->vf_info;25 struct adf_accel_dev *accel_dev = vf_info->accel_dev;26 u32 vf_nr = vf_info->vf_nr;27 bool ret;28 29 mutex_lock(&vf_info->pfvf_mig_lock);30 ret = adf_recv_and_handle_vf2pf_msg(accel_dev, vf_nr);31 if (ret)32 /* re-enable interrupt on PF from this VF */33 adf_enable_vf2pf_interrupts(accel_dev, 1 << vf_nr);34 mutex_unlock(&vf_info->pfvf_mig_lock);35 36 kfree(pf2vf_resp);37}38 39void adf_schedule_vf2pf_handler(struct adf_accel_vf_info *vf_info)40{41 struct adf_pf2vf_resp *pf2vf_resp;42 43 pf2vf_resp = kzalloc(sizeof(*pf2vf_resp), GFP_ATOMIC);44 if (!pf2vf_resp)45 return;46 47 pf2vf_resp->vf_info = vf_info;48 INIT_WORK(&pf2vf_resp->pf2vf_resp_work, adf_iov_send_resp);49 queue_work(pf2vf_resp_wq, &pf2vf_resp->pf2vf_resp_work);50}51 52static int adf_enable_sriov(struct adf_accel_dev *accel_dev)53{54 struct pci_dev *pdev = accel_to_pci_dev(accel_dev);55 int totalvfs = pci_sriov_get_totalvfs(pdev);56 struct adf_hw_device_data *hw_data = accel_dev->hw_device;57 struct adf_accel_vf_info *vf_info;58 int i;59 60 for (i = 0, vf_info = accel_dev->pf.vf_info; i < totalvfs;61 i++, vf_info++) {62 /* This ptr will be populated when VFs will be created */63 vf_info->accel_dev = accel_dev;64 vf_info->vf_nr = i;65 66 mutex_init(&vf_info->pf2vf_lock);67 mutex_init(&vf_info->pfvf_mig_lock);68 ratelimit_state_init(&vf_info->vf2pf_ratelimit,69 ADF_VF2PF_RATELIMIT_INTERVAL,70 ADF_VF2PF_RATELIMIT_BURST);71 }72 73 /* Set Valid bits in AE Thread to PCIe Function Mapping */74 if (hw_data->configure_iov_threads)75 hw_data->configure_iov_threads(accel_dev, true);76 77 /* Enable VF to PF interrupts for all VFs */78 adf_enable_vf2pf_interrupts(accel_dev, BIT_ULL(totalvfs) - 1);79 80 /*81 * Due to the hardware design, when SR-IOV and the ring arbiter82 * are enabled all the VFs supported in hardware must be enabled in83 * order for all the hardware resources (i.e. bundles) to be usable.84 * When SR-IOV is enabled, each of the VFs will own one bundle.85 */86 return pci_enable_sriov(pdev, totalvfs);87}88 89static int adf_add_sriov_configuration(struct adf_accel_dev *accel_dev)90{91 unsigned long val = 0;92 int ret;93 94 ret = adf_cfg_section_add(accel_dev, ADF_KERNEL_SEC);95 if (ret)96 return ret;97 98 ret = adf_cfg_add_key_value_param(accel_dev, ADF_KERNEL_SEC, ADF_NUM_CY,99 &val, ADF_DEC);100 if (ret)101 return ret;102 103 ret = adf_cfg_add_key_value_param(accel_dev, ADF_KERNEL_SEC, ADF_NUM_DC,104 &val, ADF_DEC);105 if (ret)106 return ret;107 108 set_bit(ADF_STATUS_CONFIGURED, &accel_dev->status);109 110 return ret;111}112 113static int adf_do_disable_sriov(struct adf_accel_dev *accel_dev)114{115 int ret;116 117 if (adf_dev_in_use(accel_dev)) {118 dev_err(&GET_DEV(accel_dev),119 "Cannot disable SR-IOV, device in use\n");120 return -EBUSY;121 }122 123 if (adf_dev_started(accel_dev)) {124 if (adf_devmgr_in_reset(accel_dev)) {125 dev_err(&GET_DEV(accel_dev),126 "Cannot disable SR-IOV, device in reset\n");127 return -EBUSY;128 }129 130 ret = adf_dev_down(accel_dev);131 if (ret)132 goto err_del_cfg;133 }134 135 adf_disable_sriov(accel_dev);136 137 ret = adf_dev_up(accel_dev, true);138 if (ret)139 goto err_del_cfg;140 141 return 0;142 143err_del_cfg:144 adf_cfg_del_all_except(accel_dev, ADF_GENERAL_SEC);145 return ret;146}147 148static int adf_do_enable_sriov(struct adf_accel_dev *accel_dev)149{150 struct pci_dev *pdev = accel_to_pci_dev(accel_dev);151 int totalvfs = pci_sriov_get_totalvfs(pdev);152 unsigned long val;153 int ret;154 155 if (!device_iommu_mapped(&GET_DEV(accel_dev))) {156 dev_warn(&GET_DEV(accel_dev),157 "IOMMU should be enabled for SR-IOV to work correctly\n");158 return -EINVAL;159 }160 161 if (adf_dev_started(accel_dev)) {162 if (adf_devmgr_in_reset(accel_dev) || adf_dev_in_use(accel_dev)) {163 dev_err(&GET_DEV(accel_dev), "Device busy\n");164 return -EBUSY;165 }166 167 ret = adf_dev_down(accel_dev);168 if (ret)169 return ret;170 }171 172 ret = adf_add_sriov_configuration(accel_dev);173 if (ret)174 goto err_del_cfg;175 176 /* Allocate memory for VF info structs */177 accel_dev->pf.vf_info = kcalloc(totalvfs, sizeof(struct adf_accel_vf_info),178 GFP_KERNEL);179 ret = -ENOMEM;180 if (!accel_dev->pf.vf_info)181 goto err_del_cfg;182 183 ret = adf_dev_up(accel_dev, false);184 if (ret) {185 dev_err(&GET_DEV(accel_dev), "Failed to start qat_dev%d\n",186 accel_dev->accel_id);187 goto err_free_vf_info;188 }189 190 ret = adf_enable_sriov(accel_dev);191 if (ret)192 goto err_free_vf_info;193 194 val = 1;195 ret = adf_cfg_add_key_value_param(accel_dev, ADF_GENERAL_SEC, ADF_SRIOV_ENABLED,196 &val, ADF_DEC);197 if (ret)198 goto err_free_vf_info;199 200 return totalvfs;201 202err_free_vf_info:203 adf_dev_down(accel_dev);204 kfree(accel_dev->pf.vf_info);205 accel_dev->pf.vf_info = NULL;206 return ret;207err_del_cfg:208 adf_cfg_del_all_except(accel_dev, ADF_GENERAL_SEC);209 return ret;210}211 212void adf_reenable_sriov(struct adf_accel_dev *accel_dev)213{214 struct pci_dev *pdev = accel_to_pci_dev(accel_dev);215 char cfg[ADF_CFG_MAX_VAL_LEN_IN_BYTES] = {0};216 217 if (adf_cfg_get_param_value(accel_dev, ADF_GENERAL_SEC,218 ADF_SRIOV_ENABLED, cfg))219 return;220 221 if (!accel_dev->pf.vf_info)222 return;223 224 if (adf_add_sriov_configuration(accel_dev))225 return;226 227 dev_dbg(&pdev->dev, "Re-enabling SRIOV\n");228 adf_enable_sriov(accel_dev);229}230 231/**232 * adf_disable_sriov() - Disable SRIOV for the device233 * @accel_dev: Pointer to accel device.234 *235 * Function disables SRIOV for the accel device.236 *237 * Return: 0 on success, error code otherwise.238 */239void adf_disable_sriov(struct adf_accel_dev *accel_dev)240{241 struct adf_hw_device_data *hw_data = accel_dev->hw_device;242 int totalvfs = pci_sriov_get_totalvfs(accel_to_pci_dev(accel_dev));243 struct adf_accel_vf_info *vf;244 int i;245 246 if (!accel_dev->pf.vf_info)247 return;248 249 adf_pf2vf_notify_restarting(accel_dev);250 adf_pf2vf_wait_for_restarting_complete(accel_dev);251 pci_disable_sriov(accel_to_pci_dev(accel_dev));252 253 /* Disable VF to PF interrupts */254 adf_disable_all_vf2pf_interrupts(accel_dev);255 256 /* Clear Valid bits in AE Thread to PCIe Function Mapping */257 if (hw_data->configure_iov_threads)258 hw_data->configure_iov_threads(accel_dev, false);259 260 for (i = 0, vf = accel_dev->pf.vf_info; i < totalvfs; i++, vf++) {261 mutex_destroy(&vf->pf2vf_lock);262 mutex_destroy(&vf->pfvf_mig_lock);263 }264 265 if (!test_bit(ADF_STATUS_RESTARTING, &accel_dev->status)) {266 kfree(accel_dev->pf.vf_info);267 accel_dev->pf.vf_info = NULL;268 }269}270EXPORT_SYMBOL_GPL(adf_disable_sriov);271 272/**273 * adf_sriov_configure() - Enable SRIOV for the device274 * @pdev: Pointer to PCI device.275 * @numvfs: Number of virtual functions (VFs) to enable.276 *277 * Note that the @numvfs parameter is ignored and all VFs supported by the278 * device are enabled due to the design of the hardware.279 *280 * Function enables SRIOV for the PCI device.281 *282 * Return: number of VFs enabled on success, error code otherwise.283 */284int adf_sriov_configure(struct pci_dev *pdev, int numvfs)285{286 struct adf_accel_dev *accel_dev = adf_devmgr_pci_to_accel_dev(pdev);287 288 if (!accel_dev) {289 dev_err(&pdev->dev, "Failed to find accel_dev\n");290 return -EFAULT;291 }292 293 if (numvfs)294 return adf_do_enable_sriov(accel_dev);295 else296 return adf_do_disable_sriov(accel_dev);297}298EXPORT_SYMBOL_GPL(adf_sriov_configure);299 300int __init adf_init_pf_wq(void)301{302 /* Workqueue for PF2VF responses */303 pf2vf_resp_wq = alloc_workqueue("qat_pf2vf_resp_wq", WQ_MEM_RECLAIM, 0);304 305 return !pf2vf_resp_wq ? -ENOMEM : 0;306}307 308void adf_exit_pf_wq(void)309{310 if (pf2vf_resp_wq) {311 destroy_workqueue(pf2vf_resp_wq);312 pf2vf_resp_wq = NULL;313 }314}315