drivers/crypto/qat/qat_common/adf_vf_isr.c

   1 // SPDX-License-Identifier: (BSD-3-Clause OR GPL-2.0-only)
   2 /* Copyright(c) 2014 - 2020 Intel Corporation */
   3 #include <linux/kernel.h>
   4 #include <linux/init.h>
   5 #include <linux/types.h>
   6 #include <linux/pci.h>
   7 #include <linux/slab.h>
   8 #include <linux/errno.h>
   9 #include <linux/interrupt.h>
  10 #include <linux/workqueue.h>
  11 #include "adf_accel_devices.h"
  12 #include "adf_common_drv.h"
  13 #include "adf_cfg.h"
  14 #include "adf_cfg_strings.h"
  15 #include "adf_cfg_common.h"
  16 #include "adf_transport_access_macros.h"
  17 #include "adf_transport_internal.h"
  18 #include "adf_pf2vf_msg.h"
  19
  20 #define ADF_VINTSOU_OFFSET      0x204
  21 #define ADF_VINTSOU_BUN         BIT(0)
  22 #define ADF_VINTSOU_PF2VF       BIT(1)
  23
  24 static struct workqueue_struct *adf_vf_stop_wq;
  25
  26 struct adf_vf_stop_data {
  27         struct adf_accel_dev *accel_dev;
  28         struct work_struct work;
  29 };
  30
  31 static int adf_enable_msi(struct adf_accel_dev *accel_dev)
  32 {
  33         struct adf_accel_pci *pci_dev_info = &accel_dev->accel_pci_dev;
  34         int stat = pci_enable_msi(pci_dev_info->pci_dev);
  35
  36         if (stat) {
  37                 dev_err(&GET_DEV(accel_dev),
  38                         "Failed to enable MSI interrupts\n");
  39                 return stat;
  40         }
  41
  42         accel_dev->vf.irq_name = kzalloc(ADF_MAX_MSIX_VECTOR_NAME, GFP_KERNEL);
  43         if (!accel_dev->vf.irq_name)
  44                 return -ENOMEM;
  45
  46         return stat;
  47 }
  48
  49 static void adf_disable_msi(struct adf_accel_dev *accel_dev)
  50 {
  51         struct pci_dev *pdev = accel_to_pci_dev(accel_dev);
  52
  53         kfree(accel_dev->vf.irq_name);
  54         pci_disable_msi(pdev);
  55 }
  56
  57 static void adf_dev_stop_async(struct work_struct *work)
  58 {
  59         struct adf_vf_stop_data *stop_data =
  60                 container_of(work, struct adf_vf_stop_data, work);
  61         struct adf_accel_dev *accel_dev = stop_data->accel_dev;
  62
  63         adf_dev_stop(accel_dev);
  64         adf_dev_shutdown(accel_dev);
  65
  66         /* Re-enable PF2VF interrupts */
  67         adf_enable_pf2vf_interrupts(accel_dev);
  68         kfree(stop_data);
  69 }
  70
  71 static void adf_pf2vf_bh_handler(void *data)
  72 {
  73         struct adf_accel_dev *accel_dev = data;
  74         struct adf_hw_device_data *hw_data = accel_dev->hw_device;
  75         struct adf_bar *pmisc =
  76                         &GET_BARS(accel_dev)[hw_data->get_misc_bar_id(hw_data)];
  77         void __iomem *pmisc_bar_addr = pmisc->virt_addr;
  78         u32 msg;
  79
  80         /* Read the message from PF */
  81         msg = ADF_CSR_RD(pmisc_bar_addr, hw_data->get_pf2vf_offset(0));
  82
  83         if (!(msg & ADF_PF2VF_MSGORIGIN_SYSTEM))
  84                 /* Ignore legacy non-system (non-kernel) PF2VF messages */
  85                 goto err;
  86
  87         switch ((msg & ADF_PF2VF_MSGTYPE_MASK) >> ADF_PF2VF_MSGTYPE_SHIFT) {
  88         case ADF_PF2VF_MSGTYPE_RESTARTING: {
  89                 struct adf_vf_stop_data *stop_data;
  90
  91                 dev_dbg(&GET_DEV(accel_dev),
  92                         "Restarting msg received from PF 0x%x\n", msg);
  93
  94                 clear_bit(ADF_STATUS_PF_RUNNING, &accel_dev->status);
  95
  96                 stop_data = kzalloc(sizeof(*stop_data), GFP_ATOMIC);
  97                 if (!stop_data) {
  98                         dev_err(&GET_DEV(accel_dev),
  99                                 "Couldn't schedule stop for vf_%d\n",
 100                                 accel_dev->accel_id);
 101                         return;
 102                 }
 103                 stop_data->accel_dev = accel_dev;
 104                 INIT_WORK(&stop_data->work, adf_dev_stop_async);
 105                 queue_work(adf_vf_stop_wq, &stop_data->work);
 106                 /* To ack, clear the PF2VFINT bit */
 107                 msg &= ~ADF_PF2VF_INT;
 108                 ADF_CSR_WR(pmisc_bar_addr, hw_data->get_pf2vf_offset(0), msg);
 109                 return;
 110         }
 111         case ADF_PF2VF_MSGTYPE_VERSION_RESP:
 112                 dev_dbg(&GET_DEV(accel_dev),
 113                         "Version resp received from PF 0x%x\n", msg);
 114                 accel_dev->vf.pf_version =
 115                         (msg & ADF_PF2VF_VERSION_RESP_VERS_MASK) >>
 116                         ADF_PF2VF_VERSION_RESP_VERS_SHIFT;
 117                 accel_dev->vf.compatible =
 118                         (msg & ADF_PF2VF_VERSION_RESP_RESULT_MASK) >>
 119                         ADF_PF2VF_VERSION_RESP_RESULT_SHIFT;
 120                 complete(&accel_dev->vf.iov_msg_completion);
 121                 break;
 122         default:
 123                 goto err;
 124         }
 125
 126         /* To ack, clear the PF2VFINT bit */
 127         msg &= ~ADF_PF2VF_INT;
 128         ADF_CSR_WR(pmisc_bar_addr, hw_data->get_pf2vf_offset(0), msg);
 129
 130         /* Re-enable PF2VF interrupts */
 131         adf_enable_pf2vf_interrupts(accel_dev);
 132         return;
 133 err:
 134         dev_err(&GET_DEV(accel_dev),
 135                 "Unknown message from PF (0x%x); leaving PF2VF ints disabled\n",
 136                 msg);
 137 }
 138
 139 static int adf_setup_pf2vf_bh(struct adf_accel_dev *accel_dev)
 140 {
 141         tasklet_init(&accel_dev->vf.pf2vf_bh_tasklet,
 142                      (void *)adf_pf2vf_bh_handler, (unsigned long)accel_dev);
 143
 144         mutex_init(&accel_dev->vf.vf2pf_lock);
 145         return 0;
 146 }
 147
 148 static void adf_cleanup_pf2vf_bh(struct adf_accel_dev *accel_dev)
 149 {
 150         tasklet_disable(&accel_dev->vf.pf2vf_bh_tasklet);
 151         tasklet_kill(&accel_dev->vf.pf2vf_bh_tasklet);
 152         mutex_destroy(&accel_dev->vf.vf2pf_lock);
 153 }
 154
 155 static irqreturn_t adf_isr(int irq, void *privdata)
 156 {
 157         struct adf_accel_dev *accel_dev = privdata;
 158         struct adf_hw_device_data *hw_data = accel_dev->hw_device;
 159         struct adf_hw_csr_ops *csr_ops = &hw_data->csr_ops;
 160         struct adf_bar *pmisc =
 161                         &GET_BARS(accel_dev)[hw_data->get_misc_bar_id(hw_data)];
 162         void __iomem *pmisc_bar_addr = pmisc->virt_addr;
 163         u32 v_int;
 164
 165         /* Read VF INT source CSR to determine the source of VF interrupt */
 166         v_int = ADF_CSR_RD(pmisc_bar_addr, ADF_VINTSOU_OFFSET);
 167
 168         /* Check for PF2VF interrupt */
 169         if (v_int & ADF_VINTSOU_PF2VF) {
 170                 /* Disable PF to VF interrupt */
 171                 adf_disable_pf2vf_interrupts(accel_dev);
 172
 173                 /* Schedule tasklet to handle interrupt BH */
 174                 tasklet_hi_schedule(&accel_dev->vf.pf2vf_bh_tasklet);
 175                 return IRQ_HANDLED;
 176         }
 177
 178         /* Check bundle interrupt */
 179         if (v_int & ADF_VINTSOU_BUN) {
 180                 struct adf_etr_data *etr_data = accel_dev->transport;
 181                 struct adf_etr_bank_data *bank = &etr_data->banks[0];
 182
 183                 /* Disable Flag and Coalesce Ring Interrupts */
 184                 csr_ops->write_csr_int_flag_and_col(bank->csr_addr,
 185                                                     bank->bank_number, 0);
 186                 tasklet_hi_schedule(&bank->resp_handler);
 187                 return IRQ_HANDLED;
 188         }
 189
 190         return IRQ_NONE;
 191 }
 192
 193 static int adf_request_msi_irq(struct adf_accel_dev *accel_dev)
 194 {
 195         struct pci_dev *pdev = accel_to_pci_dev(accel_dev);
 196         unsigned int cpu;
 197         int ret;
 198
 199         snprintf(accel_dev->vf.irq_name, ADF_MAX_MSIX_VECTOR_NAME,
 200                  "qat_%02x:%02d.%02d", pdev->bus->number, PCI_SLOT(pdev->devfn),
 201                  PCI_FUNC(pdev->devfn));
 202         ret = request_irq(pdev->irq, adf_isr, 0, accel_dev->vf.irq_name,
 203                           (void *)accel_dev);
 204         if (ret) {
 205                 dev_err(&GET_DEV(accel_dev), "failed to enable irq for %s\n",
 206                         accel_dev->vf.irq_name);
 207                 return ret;
 208         }
 209         cpu = accel_dev->accel_id % num_online_cpus();
 210         irq_set_affinity_hint(pdev->irq, get_cpu_mask(cpu));
 211
 212         return ret;
 213 }
 214
 215 static int adf_setup_bh(struct adf_accel_dev *accel_dev)
 216 {
 217         struct adf_etr_data *priv_data = accel_dev->transport;
 218
 219         tasklet_init(&priv_data->banks[0].resp_handler, adf_response_handler,
 220                      (unsigned long)priv_data->banks);
 221         return 0;
 222 }
 223
 224 static void adf_cleanup_bh(struct adf_accel_dev *accel_dev)
 225 {
 226         struct adf_etr_data *priv_data = accel_dev->transport;
 227
 228         tasklet_disable(&priv_data->banks[0].resp_handler);
 229         tasklet_kill(&priv_data->banks[0].resp_handler);
 230 }
 231
 232 /**
 233  * adf_vf_isr_resource_free() - Free IRQ for acceleration device
 234  * @accel_dev:  Pointer to acceleration device.
 235  *
 236  * Function frees interrupts for acceleration device virtual function.
 237  */
 238 void adf_vf_isr_resource_free(struct adf_accel_dev *accel_dev)
 239 {
 240         struct pci_dev *pdev = accel_to_pci_dev(accel_dev);
 241
 242         irq_set_affinity_hint(pdev->irq, NULL);
 243         free_irq(pdev->irq, (void *)accel_dev);
 244         adf_cleanup_bh(accel_dev);
 245         adf_cleanup_pf2vf_bh(accel_dev);
 246         adf_disable_msi(accel_dev);
 247 }
 248 EXPORT_SYMBOL_GPL(adf_vf_isr_resource_free);
 249
 250 /**
 251  * adf_vf_isr_resource_alloc() - Allocate IRQ for acceleration device
 252  * @accel_dev:  Pointer to acceleration device.
 253  *
 254  * Function allocates interrupts for acceleration device virtual function.
 255  *
 256  * Return: 0 on success, error code otherwise.
 257  */
 258 int adf_vf_isr_resource_alloc(struct adf_accel_dev *accel_dev)
 259 {
 260         if (adf_enable_msi(accel_dev))
 261                 goto err_out;
 262
 263         if (adf_setup_pf2vf_bh(accel_dev))
 264                 goto err_disable_msi;
 265
 266         if (adf_setup_bh(accel_dev))
 267                 goto err_cleanup_pf2vf_bh;
 268
 269         if (adf_request_msi_irq(accel_dev))
 270                 goto err_cleanup_bh;
 271
 272         return 0;
 273
 274 err_cleanup_bh:
 275         adf_cleanup_bh(accel_dev);
 276
 277 err_cleanup_pf2vf_bh:
 278         adf_cleanup_pf2vf_bh(accel_dev);
 279
 280 err_disable_msi:
 281         adf_disable_msi(accel_dev);
 282
 283 err_out:
 284         return -EFAULT;
 285 }
 286 EXPORT_SYMBOL_GPL(adf_vf_isr_resource_alloc);
 287
 288 int __init adf_init_vf_wq(void)
 289 {
 290         adf_vf_stop_wq = alloc_workqueue("adf_vf_stop_wq", WQ_MEM_RECLAIM, 0);
 291
 292         return !adf_vf_stop_wq ? -EFAULT : 0;
 293 }
 294
 295 void adf_exit_vf_wq(void)
 296 {
 297         if (adf_vf_stop_wq)
 298                 destroy_workqueue(adf_vf_stop_wq);
 299
 300         adf_vf_stop_wq = NULL;
 301 }