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 
adf_iov_send_resp(struct work_struct * work)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 
adf_schedule_vf2pf_handler(struct adf_accel_vf_info * vf_info)27 void adf_schedule_vf2pf_handler(struct adf_accel_vf_info *vf_info)
28 {
29 	struct adf_pf2vf_resp *pf2vf_resp;
30 
31 	pf2vf_resp = kzalloc(sizeof(*pf2vf_resp), GFP_ATOMIC);
32 	if (!pf2vf_resp)
33 		return;
34 
35 	pf2vf_resp->vf_info = vf_info;
36 	INIT_WORK(&pf2vf_resp->pf2vf_resp_work, adf_iov_send_resp);
37 	queue_work(pf2vf_resp_wq, &pf2vf_resp->pf2vf_resp_work);
38 }
39 
adf_enable_sriov(struct adf_accel_dev * accel_dev)40 static int adf_enable_sriov(struct adf_accel_dev *accel_dev)
41 {
42 	struct pci_dev *pdev = accel_to_pci_dev(accel_dev);
43 	int totalvfs = pci_sriov_get_totalvfs(pdev);
44 	struct adf_hw_device_data *hw_data = accel_dev->hw_device;
45 	struct adf_accel_vf_info *vf_info;
46 	int i;
47 
48 	for (i = 0, vf_info = accel_dev->pf.vf_info; i < totalvfs;
49 	     i++, vf_info++) {
50 		/* This ptr will be populated when VFs will be created */
51 		vf_info->accel_dev = accel_dev;
52 		vf_info->vf_nr = i;
53 
54 		mutex_init(&vf_info->pf2vf_lock);
55 		ratelimit_state_init(&vf_info->vf2pf_ratelimit,
56 				     DEFAULT_RATELIMIT_INTERVAL,
57 				     DEFAULT_RATELIMIT_BURST);
58 	}
59 
60 	/* Set Valid bits in AE Thread to PCIe Function Mapping */
61 	if (hw_data->configure_iov_threads)
62 		hw_data->configure_iov_threads(accel_dev, true);
63 
64 	/* Enable VF to PF interrupts for all VFs */
65 	if (hw_data->get_pf2vf_offset)
66 		adf_enable_vf2pf_interrupts(accel_dev, BIT_ULL(totalvfs) - 1);
67 
68 	/*
69 	 * Due to the hardware design, when SR-IOV and the ring arbiter
70 	 * are enabled all the VFs supported in hardware must be enabled in
71 	 * order for all the hardware resources (i.e. bundles) to be usable.
72 	 * When SR-IOV is enabled, each of the VFs will own one bundle.
73 	 */
74 	return pci_enable_sriov(pdev, totalvfs);
75 }
76 
77 /**
78  * adf_disable_sriov() - Disable SRIOV for the device
79  * @accel_dev:  Pointer to accel device.
80  *
81  * Function disables SRIOV for the accel device.
82  *
83  * Return: 0 on success, error code otherwise.
84  */
adf_disable_sriov(struct adf_accel_dev * accel_dev)85 void adf_disable_sriov(struct adf_accel_dev *accel_dev)
86 {
87 	struct adf_hw_device_data *hw_data = accel_dev->hw_device;
88 	int totalvfs = pci_sriov_get_totalvfs(accel_to_pci_dev(accel_dev));
89 	struct adf_accel_vf_info *vf;
90 	int i;
91 
92 	if (!accel_dev->pf.vf_info)
93 		return;
94 
95 	if (hw_data->get_pf2vf_offset)
96 		adf_pf2vf_notify_restarting(accel_dev);
97 
98 	pci_disable_sriov(accel_to_pci_dev(accel_dev));
99 
100 	/* Disable VF to PF interrupts */
101 	if (hw_data->get_pf2vf_offset)
102 		adf_disable_vf2pf_interrupts(accel_dev, GENMASK(31, 0));
103 
104 	/* Clear Valid bits in AE Thread to PCIe Function Mapping */
105 	if (hw_data->configure_iov_threads)
106 		hw_data->configure_iov_threads(accel_dev, false);
107 
108 	for (i = 0, vf = accel_dev->pf.vf_info; i < totalvfs; i++, vf++) {
109 		mutex_destroy(&vf->pf2vf_lock);
110 	}
111 
112 	kfree(accel_dev->pf.vf_info);
113 	accel_dev->pf.vf_info = NULL;
114 }
115 EXPORT_SYMBOL_GPL(adf_disable_sriov);
116 
117 /**
118  * adf_sriov_configure() - Enable SRIOV for the device
119  * @pdev:  Pointer to PCI device.
120  * @numvfs: Number of virtual functions (VFs) to enable.
121  *
122  * Note that the @numvfs parameter is ignored and all VFs supported by the
123  * device are enabled due to the design of the hardware.
124  *
125  * Function enables SRIOV for the PCI device.
126  *
127  * Return: number of VFs enabled on success, error code otherwise.
128  */
adf_sriov_configure(struct pci_dev * pdev,int numvfs)129 int adf_sriov_configure(struct pci_dev *pdev, int numvfs)
130 {
131 	struct adf_accel_dev *accel_dev = adf_devmgr_pci_to_accel_dev(pdev);
132 	int totalvfs = pci_sriov_get_totalvfs(pdev);
133 	unsigned long val;
134 	int ret;
135 
136 	if (!accel_dev) {
137 		dev_err(&pdev->dev, "Failed to find accel_dev\n");
138 		return -EFAULT;
139 	}
140 
141 	if (!iommu_present(&pci_bus_type))
142 		dev_warn(&pdev->dev, "IOMMU should be enabled for SR-IOV to work correctly\n");
143 
144 	if (accel_dev->pf.vf_info) {
145 		dev_info(&pdev->dev, "Already enabled for this device\n");
146 		return -EINVAL;
147 	}
148 
149 	if (adf_dev_started(accel_dev)) {
150 		if (adf_devmgr_in_reset(accel_dev) ||
151 		    adf_dev_in_use(accel_dev)) {
152 			dev_err(&GET_DEV(accel_dev), "Device busy\n");
153 			return -EBUSY;
154 		}
155 
156 		adf_dev_stop(accel_dev);
157 		adf_dev_shutdown(accel_dev);
158 	}
159 
160 	if (adf_cfg_section_add(accel_dev, ADF_KERNEL_SEC))
161 		return -EFAULT;
162 	val = 0;
163 	if (adf_cfg_add_key_value_param(accel_dev, ADF_KERNEL_SEC,
164 					ADF_NUM_CY, (void *)&val, ADF_DEC))
165 		return -EFAULT;
166 
167 	set_bit(ADF_STATUS_CONFIGURED, &accel_dev->status);
168 
169 	/* Allocate memory for VF info structs */
170 	accel_dev->pf.vf_info = kcalloc(totalvfs,
171 					sizeof(struct adf_accel_vf_info),
172 					GFP_KERNEL);
173 	if (!accel_dev->pf.vf_info)
174 		return -ENOMEM;
175 
176 	if (adf_dev_init(accel_dev)) {
177 		dev_err(&GET_DEV(accel_dev), "Failed to init qat_dev%d\n",
178 			accel_dev->accel_id);
179 		return -EFAULT;
180 	}
181 
182 	if (adf_dev_start(accel_dev)) {
183 		dev_err(&GET_DEV(accel_dev), "Failed to start qat_dev%d\n",
184 			accel_dev->accel_id);
185 		return -EFAULT;
186 	}
187 
188 	ret = adf_enable_sriov(accel_dev);
189 	if (ret)
190 		return ret;
191 
192 	return numvfs;
193 }
194 EXPORT_SYMBOL_GPL(adf_sriov_configure);
195 
adf_init_pf_wq(void)196 int __init adf_init_pf_wq(void)
197 {
198 	/* Workqueue for PF2VF responses */
199 	pf2vf_resp_wq = alloc_workqueue("qat_pf2vf_resp_wq", WQ_MEM_RECLAIM, 0);
200 
201 	return !pf2vf_resp_wq ? -ENOMEM : 0;
202 }
203 
adf_exit_pf_wq(void)204 void adf_exit_pf_wq(void)
205 {
206 	if (pf2vf_resp_wq) {
207 		destroy_workqueue(pf2vf_resp_wq);
208 		pf2vf_resp_wq = NULL;
209 	}
210 }
211