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 8 11 #define ADF_VF2PF_RATELIMIT_BURST 130 12 13 static struct workqueue_struct *pf2vf_resp_wq; 14 15 struct adf_pf2vf_resp { 16 struct work_struct pf2vf_resp_work; 17 struct adf_accel_vf_info *vf_info; 18 }; 19 20 static 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 ret = adf_recv_and_handle_vf2pf_msg(accel_dev, vf_nr); 30 if (ret) 31 /* re-enable interrupt on PF from this VF */ 32 adf_enable_vf2pf_interrupts(accel_dev, 1 << vf_nr); 33 34 kfree(pf2vf_resp); 35 } 36 37 void adf_schedule_vf2pf_handler(struct adf_accel_vf_info *vf_info) 38 { 39 struct adf_pf2vf_resp *pf2vf_resp; 40 41 pf2vf_resp = kzalloc(sizeof(*pf2vf_resp), GFP_ATOMIC); 42 if (!pf2vf_resp) 43 return; 44 45 pf2vf_resp->vf_info = vf_info; 46 INIT_WORK(&pf2vf_resp->pf2vf_resp_work, adf_iov_send_resp); 47 queue_work(pf2vf_resp_wq, &pf2vf_resp->pf2vf_resp_work); 48 } 49 50 static int adf_enable_sriov(struct adf_accel_dev *accel_dev) 51 { 52 struct pci_dev *pdev = accel_to_pci_dev(accel_dev); 53 int totalvfs = pci_sriov_get_totalvfs(pdev); 54 struct adf_hw_device_data *hw_data = accel_dev->hw_device; 55 struct adf_accel_vf_info *vf_info; 56 int i; 57 58 for (i = 0, vf_info = accel_dev->pf.vf_info; i < totalvfs; 59 i++, vf_info++) { 60 /* This ptr will be populated when VFs will be created */ 61 vf_info->accel_dev = accel_dev; 62 vf_info->vf_nr = i; 63 vf_info->vf_compat_ver = 0; 64 65 mutex_init(&vf_info->pf2vf_lock); 66 ratelimit_state_init(&vf_info->vf2pf_ratelimit, 67 ADF_VF2PF_RATELIMIT_INTERVAL, 68 ADF_VF2PF_RATELIMIT_BURST); 69 } 70 71 /* Set Valid bits in AE Thread to PCIe Function Mapping */ 72 if (hw_data->configure_iov_threads) 73 hw_data->configure_iov_threads(accel_dev, true); 74 75 /* Enable VF to PF interrupts for all VFs */ 76 adf_enable_vf2pf_interrupts(accel_dev, BIT_ULL(totalvfs) - 1); 77 78 /* 79 * Due to the hardware design, when SR-IOV and the ring arbiter 80 * are enabled all the VFs supported in hardware must be enabled in 81 * order for all the hardware resources (i.e. bundles) to be usable. 82 * When SR-IOV is enabled, each of the VFs will own one bundle. 83 */ 84 return pci_enable_sriov(pdev, totalvfs); 85 } 86 87 /** 88 * adf_disable_sriov() - Disable SRIOV for the device 89 * @accel_dev: Pointer to accel device. 90 * 91 * Function disables SRIOV for the accel device. 92 * 93 * Return: 0 on success, error code otherwise. 94 */ 95 void adf_disable_sriov(struct adf_accel_dev *accel_dev) 96 { 97 struct adf_hw_device_data *hw_data = accel_dev->hw_device; 98 int totalvfs = pci_sriov_get_totalvfs(accel_to_pci_dev(accel_dev)); 99 struct adf_accel_vf_info *vf; 100 int i; 101 102 if (!accel_dev->pf.vf_info) 103 return; 104 105 adf_pf2vf_notify_restarting(accel_dev); 106 pci_disable_sriov(accel_to_pci_dev(accel_dev)); 107 108 /* Disable VF to PF interrupts */ 109 adf_disable_all_vf2pf_interrupts(accel_dev); 110 111 /* Clear Valid bits in AE Thread to PCIe Function Mapping */ 112 if (hw_data->configure_iov_threads) 113 hw_data->configure_iov_threads(accel_dev, false); 114 115 for (i = 0, vf = accel_dev->pf.vf_info; i < totalvfs; i++, vf++) 116 mutex_destroy(&vf->pf2vf_lock); 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 (!device_iommu_mapped(&pdev->dev)) 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 ret = adf_dev_down(accel_dev, true); 163 if (ret) 164 return ret; 165 } 166 167 if (adf_cfg_section_add(accel_dev, ADF_KERNEL_SEC)) 168 return -EFAULT; 169 val = 0; 170 if (adf_cfg_add_key_value_param(accel_dev, ADF_KERNEL_SEC, 171 ADF_NUM_CY, (void *)&val, ADF_DEC)) 172 return -EFAULT; 173 ret = adf_cfg_add_key_value_param(accel_dev, ADF_KERNEL_SEC, ADF_NUM_DC, 174 &val, ADF_DEC); 175 if (ret) 176 return ret; 177 178 set_bit(ADF_STATUS_CONFIGURED, &accel_dev->status); 179 180 /* Allocate memory for VF info structs */ 181 accel_dev->pf.vf_info = kcalloc(totalvfs, 182 sizeof(struct adf_accel_vf_info), 183 GFP_KERNEL); 184 if (!accel_dev->pf.vf_info) 185 return -ENOMEM; 186 187 if (adf_dev_up(accel_dev, false)) { 188 dev_err(&GET_DEV(accel_dev), "Failed to start qat_dev%d\n", 189 accel_dev->accel_id); 190 return -EFAULT; 191 } 192 193 ret = adf_enable_sriov(accel_dev); 194 if (ret) 195 return ret; 196 197 return numvfs; 198 } 199 EXPORT_SYMBOL_GPL(adf_sriov_configure); 200 201 int __init adf_init_pf_wq(void) 202 { 203 /* Workqueue for PF2VF responses */ 204 pf2vf_resp_wq = alloc_workqueue("qat_pf2vf_resp_wq", WQ_MEM_RECLAIM, 0); 205 206 return !pf2vf_resp_wq ? -ENOMEM : 0; 207 } 208 209 void adf_exit_pf_wq(void) 210 { 211 if (pf2vf_resp_wq) { 212 destroy_workqueue(pf2vf_resp_wq); 213 pf2vf_resp_wq = NULL; 214 } 215 } 216