1 // SPDX-License-Identifier: GPL-2.0 2 /* Copyright(c) 2023 Advanced Micro Devices, Inc. */ 3 4 #include <linux/vfio.h> 5 #include <linux/vfio_pci_core.h> 6 7 #include "lm.h" 8 #include "dirty.h" 9 #include "vfio_dev.h" 10 11 struct pci_dev *pds_vfio_to_pci_dev(struct pds_vfio_pci_device *pds_vfio) 12 { 13 return pds_vfio->vfio_coredev.pdev; 14 } 15 16 struct device *pds_vfio_to_dev(struct pds_vfio_pci_device *pds_vfio) 17 { 18 return &pds_vfio_to_pci_dev(pds_vfio)->dev; 19 } 20 21 struct pds_vfio_pci_device *pds_vfio_pci_drvdata(struct pci_dev *pdev) 22 { 23 struct vfio_pci_core_device *core_device = dev_get_drvdata(&pdev->dev); 24 25 return container_of(core_device, struct pds_vfio_pci_device, 26 vfio_coredev); 27 } 28 29 void pds_vfio_state_mutex_unlock(struct pds_vfio_pci_device *pds_vfio) 30 { 31 again: 32 spin_lock(&pds_vfio->reset_lock); 33 if (pds_vfio->deferred_reset) { 34 pds_vfio->deferred_reset = false; 35 if (pds_vfio->state == VFIO_DEVICE_STATE_ERROR) { 36 pds_vfio_put_restore_file(pds_vfio); 37 pds_vfio_put_save_file(pds_vfio); 38 pds_vfio_dirty_disable(pds_vfio, false); 39 } 40 pds_vfio->state = pds_vfio->deferred_reset_state; 41 pds_vfio->deferred_reset_state = VFIO_DEVICE_STATE_RUNNING; 42 spin_unlock(&pds_vfio->reset_lock); 43 goto again; 44 } 45 mutex_unlock(&pds_vfio->state_mutex); 46 spin_unlock(&pds_vfio->reset_lock); 47 } 48 49 void pds_vfio_reset(struct pds_vfio_pci_device *pds_vfio) 50 { 51 spin_lock(&pds_vfio->reset_lock); 52 pds_vfio->deferred_reset = true; 53 pds_vfio->deferred_reset_state = VFIO_DEVICE_STATE_RUNNING; 54 if (!mutex_trylock(&pds_vfio->state_mutex)) { 55 spin_unlock(&pds_vfio->reset_lock); 56 return; 57 } 58 spin_unlock(&pds_vfio->reset_lock); 59 pds_vfio_state_mutex_unlock(pds_vfio); 60 } 61 62 static struct file * 63 pds_vfio_set_device_state(struct vfio_device *vdev, 64 enum vfio_device_mig_state new_state) 65 { 66 struct pds_vfio_pci_device *pds_vfio = 67 container_of(vdev, struct pds_vfio_pci_device, 68 vfio_coredev.vdev); 69 struct file *res = NULL; 70 71 mutex_lock(&pds_vfio->state_mutex); 72 /* 73 * only way to transition out of VFIO_DEVICE_STATE_ERROR is via 74 * VFIO_DEVICE_RESET, so prevent the state machine from running since 75 * vfio_mig_get_next_state() will throw a WARN_ON() when transitioning 76 * from VFIO_DEVICE_STATE_ERROR to any other state 77 */ 78 while (pds_vfio->state != VFIO_DEVICE_STATE_ERROR && 79 new_state != pds_vfio->state) { 80 enum vfio_device_mig_state next_state; 81 82 int err = vfio_mig_get_next_state(vdev, pds_vfio->state, 83 new_state, &next_state); 84 if (err) { 85 res = ERR_PTR(err); 86 break; 87 } 88 89 res = pds_vfio_step_device_state_locked(pds_vfio, next_state); 90 if (IS_ERR(res)) 91 break; 92 93 pds_vfio->state = next_state; 94 95 if (WARN_ON(res && new_state != pds_vfio->state)) { 96 res = ERR_PTR(-EINVAL); 97 break; 98 } 99 } 100 pds_vfio_state_mutex_unlock(pds_vfio); 101 /* still waiting on a deferred_reset */ 102 if (pds_vfio->state == VFIO_DEVICE_STATE_ERROR) 103 res = ERR_PTR(-EIO); 104 105 return res; 106 } 107 108 static int pds_vfio_get_device_state(struct vfio_device *vdev, 109 enum vfio_device_mig_state *current_state) 110 { 111 struct pds_vfio_pci_device *pds_vfio = 112 container_of(vdev, struct pds_vfio_pci_device, 113 vfio_coredev.vdev); 114 115 mutex_lock(&pds_vfio->state_mutex); 116 *current_state = pds_vfio->state; 117 pds_vfio_state_mutex_unlock(pds_vfio); 118 return 0; 119 } 120 121 static int pds_vfio_get_device_state_size(struct vfio_device *vdev, 122 unsigned long *stop_copy_length) 123 { 124 *stop_copy_length = PDS_LM_DEVICE_STATE_LENGTH; 125 return 0; 126 } 127 128 static const struct vfio_migration_ops pds_vfio_lm_ops = { 129 .migration_set_state = pds_vfio_set_device_state, 130 .migration_get_state = pds_vfio_get_device_state, 131 .migration_get_data_size = pds_vfio_get_device_state_size 132 }; 133 134 static const struct vfio_log_ops pds_vfio_log_ops = { 135 .log_start = pds_vfio_dma_logging_start, 136 .log_stop = pds_vfio_dma_logging_stop, 137 .log_read_and_clear = pds_vfio_dma_logging_report, 138 }; 139 140 static int pds_vfio_init_device(struct vfio_device *vdev) 141 { 142 struct pds_vfio_pci_device *pds_vfio = 143 container_of(vdev, struct pds_vfio_pci_device, 144 vfio_coredev.vdev); 145 struct pci_dev *pdev = to_pci_dev(vdev->dev); 146 int err, vf_id, pci_id; 147 148 vf_id = pci_iov_vf_id(pdev); 149 if (vf_id < 0) 150 return vf_id; 151 152 err = vfio_pci_core_init_dev(vdev); 153 if (err) 154 return err; 155 156 pds_vfio->vf_id = vf_id; 157 158 vdev->migration_flags = VFIO_MIGRATION_STOP_COPY | VFIO_MIGRATION_P2P; 159 vdev->mig_ops = &pds_vfio_lm_ops; 160 vdev->log_ops = &pds_vfio_log_ops; 161 162 pci_id = PCI_DEVID(pdev->bus->number, pdev->devfn); 163 dev_dbg(&pdev->dev, 164 "%s: PF %#04x VF %#04x vf_id %d domain %d pds_vfio %p\n", 165 __func__, pci_dev_id(pci_physfn(pdev)), pci_id, vf_id, 166 pci_domain_nr(pdev->bus), pds_vfio); 167 168 return 0; 169 } 170 171 static int pds_vfio_open_device(struct vfio_device *vdev) 172 { 173 struct pds_vfio_pci_device *pds_vfio = 174 container_of(vdev, struct pds_vfio_pci_device, 175 vfio_coredev.vdev); 176 int err; 177 178 err = vfio_pci_core_enable(&pds_vfio->vfio_coredev); 179 if (err) 180 return err; 181 182 mutex_init(&pds_vfio->state_mutex); 183 pds_vfio->state = VFIO_DEVICE_STATE_RUNNING; 184 pds_vfio->deferred_reset_state = VFIO_DEVICE_STATE_RUNNING; 185 186 vfio_pci_core_finish_enable(&pds_vfio->vfio_coredev); 187 188 return 0; 189 } 190 191 static void pds_vfio_close_device(struct vfio_device *vdev) 192 { 193 struct pds_vfio_pci_device *pds_vfio = 194 container_of(vdev, struct pds_vfio_pci_device, 195 vfio_coredev.vdev); 196 197 mutex_lock(&pds_vfio->state_mutex); 198 pds_vfio_put_restore_file(pds_vfio); 199 pds_vfio_put_save_file(pds_vfio); 200 pds_vfio_dirty_disable(pds_vfio, true); 201 mutex_unlock(&pds_vfio->state_mutex); 202 mutex_destroy(&pds_vfio->state_mutex); 203 vfio_pci_core_close_device(vdev); 204 } 205 206 static const struct vfio_device_ops pds_vfio_ops = { 207 .name = "pds-vfio", 208 .init = pds_vfio_init_device, 209 .release = vfio_pci_core_release_dev, 210 .open_device = pds_vfio_open_device, 211 .close_device = pds_vfio_close_device, 212 .ioctl = vfio_pci_core_ioctl, 213 .device_feature = vfio_pci_core_ioctl_feature, 214 .read = vfio_pci_core_read, 215 .write = vfio_pci_core_write, 216 .mmap = vfio_pci_core_mmap, 217 .request = vfio_pci_core_request, 218 .match = vfio_pci_core_match, 219 .bind_iommufd = vfio_iommufd_physical_bind, 220 .unbind_iommufd = vfio_iommufd_physical_unbind, 221 .attach_ioas = vfio_iommufd_physical_attach_ioas, 222 }; 223 224 const struct vfio_device_ops *pds_vfio_ops_info(void) 225 { 226 return &pds_vfio_ops; 227 } 228