drivers/crypto/qat/qat_common/adf_pf2vf_msg.c

   1 // SPDX-License-Identifier: (BSD-3-Clause OR GPL-2.0-only)
   2 /* Copyright(c) 2015 - 2020 Intel Corporation */
   3 #include <linux/delay.h>
   4 #include "adf_accel_devices.h"
   5 #include "adf_common_drv.h"
   6 #include "adf_pf2vf_msg.h"
   7
   8 #define ADF_DH895XCC_EP_OFFSET  0x3A000
   9 #define ADF_DH895XCC_ERRMSK3    (ADF_DH895XCC_EP_OFFSET + 0x1C)
  10 #define ADF_DH895XCC_ERRMSK3_VF2PF_L_MASK(vf_mask) ((vf_mask & 0xFFFF) << 9)
  11 #define ADF_DH895XCC_ERRMSK5    (ADF_DH895XCC_EP_OFFSET + 0xDC)
  12 #define ADF_DH895XCC_ERRMSK5_VF2PF_U_MASK(vf_mask) (vf_mask >> 16)
  13
  14 void adf_enable_pf2vf_interrupts(struct adf_accel_dev *accel_dev)
  15 {
  16         struct adf_accel_pci *pci_info = &accel_dev->accel_pci_dev;
  17         struct adf_hw_device_data *hw_data = accel_dev->hw_device;
  18         void __iomem *pmisc_bar_addr =
  19                 pci_info->pci_bars[hw_data->get_misc_bar_id(hw_data)].virt_addr;
  20
  21         ADF_CSR_WR(pmisc_bar_addr, hw_data->get_vintmsk_offset(0), 0x0);
  22 }
  23
  24 void adf_disable_pf2vf_interrupts(struct adf_accel_dev *accel_dev)
  25 {
  26         struct adf_accel_pci *pci_info = &accel_dev->accel_pci_dev;
  27         struct adf_hw_device_data *hw_data = accel_dev->hw_device;
  28         void __iomem *pmisc_bar_addr =
  29                 pci_info->pci_bars[hw_data->get_misc_bar_id(hw_data)].virt_addr;
  30
  31         ADF_CSR_WR(pmisc_bar_addr, hw_data->get_vintmsk_offset(0), 0x2);
  32 }
  33
  34 void adf_enable_vf2pf_interrupts(struct adf_accel_dev *accel_dev,
  35                                  u32 vf_mask)
  36 {
  37         struct adf_hw_device_data *hw_data = accel_dev->hw_device;
  38         struct adf_bar *pmisc =
  39                         &GET_BARS(accel_dev)[hw_data->get_misc_bar_id(hw_data)];
  40         void __iomem *pmisc_addr = pmisc->virt_addr;
  41         u32 reg;
  42
  43         /* Enable VF2PF Messaging Ints - VFs 1 through 16 per vf_mask[15:0] */
  44         if (vf_mask & 0xFFFF) {
  45                 reg = ADF_CSR_RD(pmisc_addr, ADF_DH895XCC_ERRMSK3);
  46                 reg &= ~ADF_DH895XCC_ERRMSK3_VF2PF_L_MASK(vf_mask);
  47                 ADF_CSR_WR(pmisc_addr, ADF_DH895XCC_ERRMSK3, reg);
  48         }
  49
  50         /* Enable VF2PF Messaging Ints - VFs 17 through 32 per vf_mask[31:16] */
  51         if (vf_mask >> 16) {
  52                 reg = ADF_CSR_RD(pmisc_addr, ADF_DH895XCC_ERRMSK5);
  53                 reg &= ~ADF_DH895XCC_ERRMSK5_VF2PF_U_MASK(vf_mask);
  54                 ADF_CSR_WR(pmisc_addr, ADF_DH895XCC_ERRMSK5, reg);
  55         }
  56 }
  57
  58 void adf_disable_vf2pf_interrupts(struct adf_accel_dev *accel_dev, u32 vf_mask)
  59 {
  60         struct adf_hw_device_data *hw_data = accel_dev->hw_device;
  61         struct adf_bar *pmisc =
  62                         &GET_BARS(accel_dev)[hw_data->get_misc_bar_id(hw_data)];
  63         void __iomem *pmisc_addr = pmisc->virt_addr;
  64         u32 reg;
  65
  66         /* Disable VF2PF interrupts for VFs 1 through 16 per vf_mask[15:0] */
  67         if (vf_mask & 0xFFFF) {
  68                 reg = ADF_CSR_RD(pmisc_addr, ADF_DH895XCC_ERRMSK3) |
  69                         ADF_DH895XCC_ERRMSK3_VF2PF_L_MASK(vf_mask);
  70                 ADF_CSR_WR(pmisc_addr, ADF_DH895XCC_ERRMSK3, reg);
  71         }
  72
  73         /* Disable VF2PF interrupts for VFs 17 through 32 per vf_mask[31:16] */
  74         if (vf_mask >> 16) {
  75                 reg = ADF_CSR_RD(pmisc_addr, ADF_DH895XCC_ERRMSK5) |
  76                         ADF_DH895XCC_ERRMSK5_VF2PF_U_MASK(vf_mask);
  77                 ADF_CSR_WR(pmisc_addr, ADF_DH895XCC_ERRMSK5, reg);
  78         }
  79 }
  80
  81 static int __adf_iov_putmsg(struct adf_accel_dev *accel_dev, u32 msg, u8 vf_nr)
  82 {
  83         struct adf_accel_pci *pci_info = &accel_dev->accel_pci_dev;
  84         struct adf_hw_device_data *hw_data = accel_dev->hw_device;
  85         void __iomem *pmisc_bar_addr =
  86                 pci_info->pci_bars[hw_data->get_misc_bar_id(hw_data)].virt_addr;
  87         u32 val, pf2vf_offset, count = 0;
  88         u32 local_in_use_mask, local_in_use_pattern;
  89         u32 remote_in_use_mask, remote_in_use_pattern;
  90         struct mutex *lock;     /* lock preventing concurrent acces of CSR */
  91         u32 int_bit;
  92         int ret = 0;
  93
  94         if (accel_dev->is_vf) {
  95                 pf2vf_offset = hw_data->get_pf2vf_offset(0);
  96                 lock = &accel_dev->vf.vf2pf_lock;
  97                 local_in_use_mask = ADF_VF2PF_IN_USE_BY_VF_MASK;
  98                 local_in_use_pattern = ADF_VF2PF_IN_USE_BY_VF;
  99                 remote_in_use_mask = ADF_PF2VF_IN_USE_BY_PF_MASK;
 100                 remote_in_use_pattern = ADF_PF2VF_IN_USE_BY_PF;
 101                 int_bit = ADF_VF2PF_INT;
 102         } else {
 103                 pf2vf_offset = hw_data->get_pf2vf_offset(vf_nr);
 104                 lock = &accel_dev->pf.vf_info[vf_nr].pf2vf_lock;
 105                 local_in_use_mask = ADF_PF2VF_IN_USE_BY_PF_MASK;
 106                 local_in_use_pattern = ADF_PF2VF_IN_USE_BY_PF;
 107                 remote_in_use_mask = ADF_VF2PF_IN_USE_BY_VF_MASK;
 108                 remote_in_use_pattern = ADF_VF2PF_IN_USE_BY_VF;
 109                 int_bit = ADF_PF2VF_INT;
 110         }
 111
 112         mutex_lock(lock);
 113
 114         /* Check if PF2VF CSR is in use by remote function */
 115         val = ADF_CSR_RD(pmisc_bar_addr, pf2vf_offset);
 116         if ((val & remote_in_use_mask) == remote_in_use_pattern) {
 117                 dev_dbg(&GET_DEV(accel_dev),
 118                         "PF2VF CSR in use by remote function\n");
 119                 ret = -EBUSY;
 120                 goto out;
 121         }
 122
 123         /* Attempt to get ownership of PF2VF CSR */
 124         msg &= ~local_in_use_mask;
 125         msg |= local_in_use_pattern;
 126         ADF_CSR_WR(pmisc_bar_addr, pf2vf_offset, msg);
 127
 128         /* Wait in case remote func also attempting to get ownership */
 129         msleep(ADF_IOV_MSG_COLLISION_DETECT_DELAY);
 130
 131         val = ADF_CSR_RD(pmisc_bar_addr, pf2vf_offset);
 132         if ((val & local_in_use_mask) != local_in_use_pattern) {
 133                 dev_dbg(&GET_DEV(accel_dev),
 134                         "PF2VF CSR in use by remote - collision detected\n");
 135                 ret = -EBUSY;
 136                 goto out;
 137         }
 138
 139         /*
 140          * This function now owns the PV2VF CSR.  The IN_USE_BY pattern must
 141          * remain in the PF2VF CSR for all writes including ACK from remote
 142          * until this local function relinquishes the CSR.  Send the message
 143          * by interrupting the remote.
 144          */
 145         ADF_CSR_WR(pmisc_bar_addr, pf2vf_offset, msg | int_bit);
 146
 147         /* Wait for confirmation from remote func it received the message */
 148         do {
 149                 msleep(ADF_IOV_MSG_ACK_DELAY);
 150                 val = ADF_CSR_RD(pmisc_bar_addr, pf2vf_offset);
 151         } while ((val & int_bit) && (count++ < ADF_IOV_MSG_ACK_MAX_RETRY));
 152
 153         if (val & int_bit) {
 154                 dev_dbg(&GET_DEV(accel_dev), "ACK not received from remote\n");
 155                 val &= ~int_bit;
 156                 ret = -EIO;
 157         }
 158
 159         /* Finished with PF2VF CSR; relinquish it and leave msg in CSR */
 160         ADF_CSR_WR(pmisc_bar_addr, pf2vf_offset, val & ~local_in_use_mask);
 161 out:
 162         mutex_unlock(lock);
 163         return ret;
 164 }
 165
 166 /**
 167  * adf_iov_putmsg() - send PF2VF message
 168  * @accel_dev:  Pointer to acceleration device.
 169  * @msg:        Message to send
 170  * @vf_nr:      VF number to which the message will be sent
 171  *
 172  * Function sends a message from the PF to a VF
 173  *
 174  * Return: 0 on success, error code otherwise.
 175  */
 176 int adf_iov_putmsg(struct adf_accel_dev *accel_dev, u32 msg, u8 vf_nr)
 177 {
 178         u32 count = 0;
 179         int ret;
 180
 181         do {
 182                 ret = __adf_iov_putmsg(accel_dev, msg, vf_nr);
 183                 if (ret)
 184                         msleep(ADF_IOV_MSG_RETRY_DELAY);
 185         } while (ret && (count++ < ADF_IOV_MSG_MAX_RETRIES));
 186
 187         return ret;
 188 }
 189 EXPORT_SYMBOL_GPL(adf_iov_putmsg);
 190
 191 void adf_vf2pf_req_hndl(struct adf_accel_vf_info *vf_info)
 192 {
 193         struct adf_accel_dev *accel_dev = vf_info->accel_dev;
 194         struct adf_hw_device_data *hw_data = accel_dev->hw_device;
 195         int bar_id = hw_data->get_misc_bar_id(hw_data);
 196         struct adf_bar *pmisc = &GET_BARS(accel_dev)[bar_id];
 197         void __iomem *pmisc_addr = pmisc->virt_addr;
 198         u32 msg, resp = 0, vf_nr = vf_info->vf_nr;
 199
 200         /* Read message from the VF */
 201         msg = ADF_CSR_RD(pmisc_addr, hw_data->get_pf2vf_offset(vf_nr));
 202
 203         /* To ACK, clear the VF2PFINT bit */
 204         msg &= ~ADF_VF2PF_INT;
 205         ADF_CSR_WR(pmisc_addr, hw_data->get_pf2vf_offset(vf_nr), msg);
 206
 207         if (!(msg & ADF_VF2PF_MSGORIGIN_SYSTEM))
 208                 /* Ignore legacy non-system (non-kernel) VF2PF messages */
 209                 goto err;
 210
 211         switch ((msg & ADF_VF2PF_MSGTYPE_MASK) >> ADF_VF2PF_MSGTYPE_SHIFT) {
 212         case ADF_VF2PF_MSGTYPE_COMPAT_VER_REQ:
 213                 {
 214                 u8 vf_compat_ver = msg >> ADF_VF2PF_COMPAT_VER_REQ_SHIFT;
 215
 216                 resp = (ADF_PF2VF_MSGORIGIN_SYSTEM |
 217                          (ADF_PF2VF_MSGTYPE_VERSION_RESP <<
 218                           ADF_PF2VF_MSGTYPE_SHIFT) |
 219                          (ADF_PFVF_COMPATIBILITY_VERSION <<
 220                           ADF_PF2VF_VERSION_RESP_VERS_SHIFT));
 221
 222                 dev_dbg(&GET_DEV(accel_dev),
 223                         "Compatibility Version Request from VF%d vers=%u\n",
 224                         vf_nr + 1, vf_compat_ver);
 225
 226                 if (vf_compat_ver < hw_data->min_iov_compat_ver) {
 227                         dev_err(&GET_DEV(accel_dev),
 228                                 "VF (vers %d) incompatible with PF (vers %d)\n",
 229                                 vf_compat_ver, ADF_PFVF_COMPATIBILITY_VERSION);
 230                         resp |= ADF_PF2VF_VF_INCOMPATIBLE <<
 231                                 ADF_PF2VF_VERSION_RESP_RESULT_SHIFT;
 232                 } else if (vf_compat_ver > ADF_PFVF_COMPATIBILITY_VERSION) {
 233                         dev_err(&GET_DEV(accel_dev),
 234                                 "VF (vers %d) compat with PF (vers %d) unkn.\n",
 235                                 vf_compat_ver, ADF_PFVF_COMPATIBILITY_VERSION);
 236                         resp |= ADF_PF2VF_VF_COMPAT_UNKNOWN <<
 237                                 ADF_PF2VF_VERSION_RESP_RESULT_SHIFT;
 238                 } else {
 239                         dev_dbg(&GET_DEV(accel_dev),
 240                                 "VF (vers %d) compatible with PF (vers %d)\n",
 241                                 vf_compat_ver, ADF_PFVF_COMPATIBILITY_VERSION);
 242                         resp |= ADF_PF2VF_VF_COMPATIBLE <<
 243                                 ADF_PF2VF_VERSION_RESP_RESULT_SHIFT;
 244                 }
 245                 }
 246                 break;
 247         case ADF_VF2PF_MSGTYPE_VERSION_REQ:
 248                 dev_dbg(&GET_DEV(accel_dev),
 249                         "Legacy VersionRequest received from VF%d 0x%x\n",
 250                         vf_nr + 1, msg);
 251                 resp = (ADF_PF2VF_MSGORIGIN_SYSTEM |
 252                          (ADF_PF2VF_MSGTYPE_VERSION_RESP <<
 253                           ADF_PF2VF_MSGTYPE_SHIFT) |
 254                          (ADF_PFVF_COMPATIBILITY_VERSION <<
 255                           ADF_PF2VF_VERSION_RESP_VERS_SHIFT));
 256                 resp |= ADF_PF2VF_VF_COMPATIBLE <<
 257                         ADF_PF2VF_VERSION_RESP_RESULT_SHIFT;
 258                 /* Set legacy major and minor version num */
 259                 resp |= 1 << ADF_PF2VF_MAJORVERSION_SHIFT |
 260                         1 << ADF_PF2VF_MINORVERSION_SHIFT;
 261                 break;
 262         case ADF_VF2PF_MSGTYPE_INIT:
 263                 {
 264                 dev_dbg(&GET_DEV(accel_dev),
 265                         "Init message received from VF%d 0x%x\n",
 266                         vf_nr + 1, msg);
 267                 vf_info->init = true;
 268                 }
 269                 break;
 270         case ADF_VF2PF_MSGTYPE_SHUTDOWN:
 271                 {
 272                 dev_dbg(&GET_DEV(accel_dev),
 273                         "Shutdown message received from VF%d 0x%x\n",
 274                         vf_nr + 1, msg);
 275                 vf_info->init = false;
 276                 }
 277                 break;
 278         default:
 279                 goto err;
 280         }
 281
 282         if (resp && adf_iov_putmsg(accel_dev, resp, vf_nr))
 283                 dev_err(&GET_DEV(accel_dev), "Failed to send response to VF\n");
 284
 285         /* re-enable interrupt on PF from this VF */
 286         adf_enable_vf2pf_interrupts(accel_dev, (1 << vf_nr));
 287         return;
 288 err:
 289         dev_dbg(&GET_DEV(accel_dev), "Unknown message from VF%d (0x%x);\n",
 290                 vf_nr + 1, msg);
 291 }
 292
 293 void adf_pf2vf_notify_restarting(struct adf_accel_dev *accel_dev)
 294 {
 295         struct adf_accel_vf_info *vf;
 296         u32 msg = (ADF_PF2VF_MSGORIGIN_SYSTEM |
 297                 (ADF_PF2VF_MSGTYPE_RESTARTING << ADF_PF2VF_MSGTYPE_SHIFT));
 298         int i, num_vfs = pci_num_vf(accel_to_pci_dev(accel_dev));
 299
 300         for (i = 0, vf = accel_dev->pf.vf_info; i < num_vfs; i++, vf++) {
 301                 if (vf->init && adf_iov_putmsg(accel_dev, msg, i))
 302                         dev_err(&GET_DEV(accel_dev),
 303                                 "Failed to send restarting msg to VF%d\n", i);
 304         }
 305 }
 306
 307 static int adf_vf2pf_request_version(struct adf_accel_dev *accel_dev)
 308 {
 309         unsigned long timeout = msecs_to_jiffies(ADF_IOV_MSG_RESP_TIMEOUT);
 310         struct adf_hw_device_data *hw_data = accel_dev->hw_device;
 311         u32 msg = 0;
 312         int ret;
 313
 314         msg = ADF_VF2PF_MSGORIGIN_SYSTEM;
 315         msg |= ADF_VF2PF_MSGTYPE_COMPAT_VER_REQ << ADF_VF2PF_MSGTYPE_SHIFT;
 316         msg |= ADF_PFVF_COMPATIBILITY_VERSION << ADF_VF2PF_COMPAT_VER_REQ_SHIFT;
 317         BUILD_BUG_ON(ADF_PFVF_COMPATIBILITY_VERSION > 255);
 318
 319         /* Send request from VF to PF */
 320         ret = adf_iov_putmsg(accel_dev, msg, 0);
 321         if (ret) {
 322                 dev_err(&GET_DEV(accel_dev),
 323                         "Failed to send Compatibility Version Request.\n");
 324                 return ret;
 325         }
 326
 327         /* Wait for response */
 328         if (!wait_for_completion_timeout(&accel_dev->vf.iov_msg_completion,
 329                                          timeout)) {
 330                 dev_err(&GET_DEV(accel_dev),
 331                         "IOV request/response message timeout expired\n");
 332                 return -EIO;
 333         }
 334
 335         /* Response from PF received, check compatibility */
 336         switch (accel_dev->vf.compatible) {
 337         case ADF_PF2VF_VF_COMPATIBLE:
 338                 break;
 339         case ADF_PF2VF_VF_COMPAT_UNKNOWN:
 340                 /* VF is newer than PF and decides whether it is compatible */
 341                 if (accel_dev->vf.pf_version >= hw_data->min_iov_compat_ver)
 342                         break;
 343                 fallthrough;
 344         case ADF_PF2VF_VF_INCOMPATIBLE:
 345                 dev_err(&GET_DEV(accel_dev),
 346                         "PF (vers %d) and VF (vers %d) are not compatible\n",
 347                         accel_dev->vf.pf_version,
 348                         ADF_PFVF_COMPATIBILITY_VERSION);
 349                 return -EINVAL;
 350         default:
 351                 dev_err(&GET_DEV(accel_dev),
 352                         "Invalid response from PF; assume not compatible\n");
 353                 return -EINVAL;
 354         }
 355         return ret;
 356 }
 357
 358 /**
 359  * adf_enable_vf2pf_comms() - Function enables communication from vf to pf
 360  *
 361  * @accel_dev: Pointer to acceleration device virtual function.
 362  *
 363  * Return: 0 on success, error code otherwise.
 364  */
 365 int adf_enable_vf2pf_comms(struct adf_accel_dev *accel_dev)
 366 {
 367         adf_enable_pf2vf_interrupts(accel_dev);
 368         return adf_vf2pf_request_version(accel_dev);
 369 }
 370 EXPORT_SYMBOL_GPL(adf_enable_vf2pf_comms);