drivers/crypto/qat/qat_common/adf_vf_isr.c

   1 /*
   2   This file is provided under a dual BSD/GPLv2 license.  When using or
   3   redistributing this file, you may do so under either license.
   4
   5   GPL LICENSE SUMMARY
   6   Copyright(c) 2014 Intel Corporation.
   7   This program is free software; you can redistribute it and/or modify
   8   it under the terms of version 2 of the GNU General Public License as
   9   published by the Free Software Foundation.
  10
  11   This program is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14   General Public License for more details.
  15
  16   Contact Information:
  17   qat-linux@intel.com
  18
  19   BSD LICENSE
  20   Copyright(c) 2014 Intel Corporation.
  21   Redistribution and use in source and binary forms, with or without
  22   modification, are permitted provided that the following conditions
  23   are met:
  24
  25     * Redistributions of source code must retain the above copyright
  26       notice, this list of conditions and the following disclaimer.
  27     * Redistributions in binary form must reproduce the above copyright
  28       notice, this list of conditions and the following disclaimer in
  29       the documentation and/or other materials provided with the
  30       distribution.
  31     * Neither the name of Intel Corporation nor the names of its
  32       contributors may be used to endorse or promote products derived
  33       from this software without specific prior written permission.
  34
  35   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  36   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  37   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  38   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  39   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  40   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  41   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  42   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  43   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  44   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  45   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  46 */
  47 #include <linux/kernel.h>
  48 #include <linux/init.h>
  49 #include <linux/types.h>
  50 #include <linux/pci.h>
  51 #include <linux/slab.h>
  52 #include <linux/errno.h>
  53 #include <linux/interrupt.h>
  54 #include <linux/workqueue.h>
  55 #include "adf_accel_devices.h"
  56 #include "adf_common_drv.h"
  57 #include "adf_cfg.h"
  58 #include "adf_cfg_strings.h"
  59 #include "adf_cfg_common.h"
  60 #include "adf_transport_access_macros.h"
  61 #include "adf_transport_internal.h"
  62 #include "adf_pf2vf_msg.h"
  63
  64 #define ADF_VINTSOU_OFFSET      0x204
  65 #define ADF_VINTSOU_BUN         BIT(0)
  66 #define ADF_VINTSOU_PF2VF       BIT(1)
  67
  68 static struct workqueue_struct *adf_vf_stop_wq;
  69
  70 struct adf_vf_stop_data {
  71         struct adf_accel_dev *accel_dev;
  72         struct work_struct work;
  73 };
  74
  75 static int adf_enable_msi(struct adf_accel_dev *accel_dev)
  76 {
  77         struct adf_accel_pci *pci_dev_info = &accel_dev->accel_pci_dev;
  78         int stat = pci_enable_msi(pci_dev_info->pci_dev);
  79
  80         if (stat) {
  81                 dev_err(&GET_DEV(accel_dev),
  82                         "Failed to enable MSI interrupts\n");
  83                 return stat;
  84         }
  85
  86         accel_dev->vf.irq_name = kzalloc(ADF_MAX_MSIX_VECTOR_NAME, GFP_KERNEL);
  87         if (!accel_dev->vf.irq_name)
  88                 return -ENOMEM;
  89
  90         return stat;
  91 }
  92
  93 static void adf_disable_msi(struct adf_accel_dev *accel_dev)
  94 {
  95         struct pci_dev *pdev = accel_to_pci_dev(accel_dev);
  96
  97         kfree(accel_dev->vf.irq_name);
  98         pci_disable_msi(pdev);
  99 }
 100
 101 static void adf_dev_stop_async(struct work_struct *work)
 102 {
 103         struct adf_vf_stop_data *stop_data =
 104                 container_of(work, struct adf_vf_stop_data, work);
 105         struct adf_accel_dev *accel_dev = stop_data->accel_dev;
 106
 107         adf_dev_stop(accel_dev);
 108         adf_dev_shutdown(accel_dev);
 109
 110         /* Re-enable PF2VF interrupts */
 111         adf_enable_pf2vf_interrupts(accel_dev);
 112         kfree(stop_data);
 113 }
 114
 115 static void adf_pf2vf_bh_handler(void *data)
 116 {
 117         struct adf_accel_dev *accel_dev = data;
 118         struct adf_hw_device_data *hw_data = accel_dev->hw_device;
 119         struct adf_bar *pmisc =
 120                         &GET_BARS(accel_dev)[hw_data->get_misc_bar_id(hw_data)];
 121         void __iomem *pmisc_bar_addr = pmisc->virt_addr;
 122         u32 msg;
 123
 124         /* Read the message from PF */
 125         msg = ADF_CSR_RD(pmisc_bar_addr, hw_data->get_pf2vf_offset(0));
 126
 127         if (!(msg & ADF_PF2VF_MSGORIGIN_SYSTEM))
 128                 /* Ignore legacy non-system (non-kernel) PF2VF messages */
 129                 goto err;
 130
 131         switch ((msg & ADF_PF2VF_MSGTYPE_MASK) >> ADF_PF2VF_MSGTYPE_SHIFT) {
 132         case ADF_PF2VF_MSGTYPE_RESTARTING: {
 133                 struct adf_vf_stop_data *stop_data;
 134
 135                 dev_dbg(&GET_DEV(accel_dev),
 136                         "Restarting msg received from PF 0x%x\n", msg);
 137
 138                 stop_data = kzalloc(sizeof(*stop_data), GFP_ATOMIC);
 139                 if (!stop_data) {
 140                         dev_err(&GET_DEV(accel_dev),
 141                                 "Couldn't schedule stop for vf_%d\n",
 142                                 accel_dev->accel_id);
 143                         return;
 144                 }
 145                 stop_data->accel_dev = accel_dev;
 146                 INIT_WORK(&stop_data->work, adf_dev_stop_async);
 147                 queue_work(adf_vf_stop_wq, &stop_data->work);
 148                 /* To ack, clear the PF2VFINT bit */
 149                 msg &= ~BIT(0);
 150                 ADF_CSR_WR(pmisc_bar_addr, hw_data->get_pf2vf_offset(0), msg);
 151                 return;
 152         }
 153         case ADF_PF2VF_MSGTYPE_VERSION_RESP:
 154                 dev_dbg(&GET_DEV(accel_dev),
 155                         "Version resp received from PF 0x%x\n", msg);
 156                 accel_dev->vf.pf_version =
 157                         (msg & ADF_PF2VF_VERSION_RESP_VERS_MASK) >>
 158                         ADF_PF2VF_VERSION_RESP_VERS_SHIFT;
 159                 accel_dev->vf.compatible =
 160                         (msg & ADF_PF2VF_VERSION_RESP_RESULT_MASK) >>
 161                         ADF_PF2VF_VERSION_RESP_RESULT_SHIFT;
 162                 complete(&accel_dev->vf.iov_msg_completion);
 163                 break;
 164         default:
 165                 goto err;
 166         }
 167
 168         /* To ack, clear the PF2VFINT bit */
 169         msg &= ~BIT(0);
 170         ADF_CSR_WR(pmisc_bar_addr, hw_data->get_pf2vf_offset(0), msg);
 171
 172         /* Re-enable PF2VF interrupts */
 173         adf_enable_pf2vf_interrupts(accel_dev);
 174         return;
 175 err:
 176         dev_err(&GET_DEV(accel_dev),
 177                 "Unknown message from PF (0x%x); leaving PF2VF ints disabled\n",
 178                 msg);
 179 }
 180
 181 static int adf_setup_pf2vf_bh(struct adf_accel_dev *accel_dev)
 182 {
 183         tasklet_init(&accel_dev->vf.pf2vf_bh_tasklet,
 184                      (void *)adf_pf2vf_bh_handler, (unsigned long)accel_dev);
 185
 186         mutex_init(&accel_dev->vf.vf2pf_lock);
 187         return 0;
 188 }
 189
 190 static void adf_cleanup_pf2vf_bh(struct adf_accel_dev *accel_dev)
 191 {
 192         tasklet_disable(&accel_dev->vf.pf2vf_bh_tasklet);
 193         tasklet_kill(&accel_dev->vf.pf2vf_bh_tasklet);
 194         mutex_destroy(&accel_dev->vf.vf2pf_lock);
 195 }
 196
 197 static irqreturn_t adf_isr(int irq, void *privdata)
 198 {
 199         struct adf_accel_dev *accel_dev = privdata;
 200         struct adf_hw_device_data *hw_data = accel_dev->hw_device;
 201         struct adf_bar *pmisc =
 202                         &GET_BARS(accel_dev)[hw_data->get_misc_bar_id(hw_data)];
 203         void __iomem *pmisc_bar_addr = pmisc->virt_addr;
 204         u32 v_int;
 205
 206         /* Read VF INT source CSR to determine the source of VF interrupt */
 207         v_int = ADF_CSR_RD(pmisc_bar_addr, ADF_VINTSOU_OFFSET);
 208
 209         /* Check for PF2VF interrupt */
 210         if (v_int & ADF_VINTSOU_PF2VF) {
 211                 /* Disable PF to VF interrupt */
 212                 adf_disable_pf2vf_interrupts(accel_dev);
 213
 214                 /* Schedule tasklet to handle interrupt BH */
 215                 tasklet_hi_schedule(&accel_dev->vf.pf2vf_bh_tasklet);
 216                 return IRQ_HANDLED;
 217         }
 218
 219         /* Check bundle interrupt */
 220         if (v_int & ADF_VINTSOU_BUN) {
 221                 struct adf_etr_data *etr_data = accel_dev->transport;
 222                 struct adf_etr_bank_data *bank = &etr_data->banks[0];
 223
 224                 /* Disable Flag and Coalesce Ring Interrupts */
 225                 WRITE_CSR_INT_FLAG_AND_COL(bank->csr_addr, bank->bank_number,
 226                                            0);
 227                 tasklet_hi_schedule(&bank->resp_handler);
 228                 return IRQ_HANDLED;
 229         }
 230
 231         return IRQ_NONE;
 232 }
 233
 234 static int adf_request_msi_irq(struct adf_accel_dev *accel_dev)
 235 {
 236         struct pci_dev *pdev = accel_to_pci_dev(accel_dev);
 237         unsigned int cpu;
 238         int ret;
 239
 240         snprintf(accel_dev->vf.irq_name, ADF_MAX_MSIX_VECTOR_NAME,
 241                  "qat_%02x:%02d.%02d", pdev->bus->number, PCI_SLOT(pdev->devfn),
 242                  PCI_FUNC(pdev->devfn));
 243         ret = request_irq(pdev->irq, adf_isr, 0, accel_dev->vf.irq_name,
 244                           (void *)accel_dev);
 245         if (ret) {
 246                 dev_err(&GET_DEV(accel_dev), "failed to enable irq for %s\n",
 247                         accel_dev->vf.irq_name);
 248                 return ret;
 249         }
 250         cpu = accel_dev->accel_id % num_online_cpus();
 251         irq_set_affinity_hint(pdev->irq, get_cpu_mask(cpu));
 252
 253         return ret;
 254 }
 255
 256 static int adf_setup_bh(struct adf_accel_dev *accel_dev)
 257 {
 258         struct adf_etr_data *priv_data = accel_dev->transport;
 259
 260         tasklet_init(&priv_data->banks[0].resp_handler, adf_response_handler,
 261                      (unsigned long)priv_data->banks);
 262         return 0;
 263 }
 264
 265 static void adf_cleanup_bh(struct adf_accel_dev *accel_dev)
 266 {
 267         struct adf_etr_data *priv_data = accel_dev->transport;
 268
 269         tasklet_disable(&priv_data->banks[0].resp_handler);
 270         tasklet_kill(&priv_data->banks[0].resp_handler);
 271 }
 272
 273 /**
 274  * adf_vf_isr_resource_free() - Free IRQ for acceleration device
 275  * @accel_dev:  Pointer to acceleration device.
 276  *
 277  * Function frees interrupts for acceleration device virtual function.
 278  */
 279 void adf_vf_isr_resource_free(struct adf_accel_dev *accel_dev)
 280 {
 281         struct pci_dev *pdev = accel_to_pci_dev(accel_dev);
 282
 283         irq_set_affinity_hint(pdev->irq, NULL);
 284         free_irq(pdev->irq, (void *)accel_dev);
 285         adf_cleanup_bh(accel_dev);
 286         adf_cleanup_pf2vf_bh(accel_dev);
 287         adf_disable_msi(accel_dev);
 288 }
 289 EXPORT_SYMBOL_GPL(adf_vf_isr_resource_free);
 290
 291 /**
 292  * adf_vf_isr_resource_alloc() - Allocate IRQ for acceleration device
 293  * @accel_dev:  Pointer to acceleration device.
 294  *
 295  * Function allocates interrupts for acceleration device virtual function.
 296  *
 297  * Return: 0 on success, error code otherwise.
 298  */
 299 int adf_vf_isr_resource_alloc(struct adf_accel_dev *accel_dev)
 300 {
 301         if (adf_enable_msi(accel_dev))
 302                 goto err_out;
 303
 304         if (adf_setup_pf2vf_bh(accel_dev))
 305                 goto err_out;
 306
 307         if (adf_setup_bh(accel_dev))
 308                 goto err_out;
 309
 310         if (adf_request_msi_irq(accel_dev))
 311                 goto err_out;
 312
 313         return 0;
 314 err_out:
 315         adf_vf_isr_resource_free(accel_dev);
 316         return -EFAULT;
 317 }
 318 EXPORT_SYMBOL_GPL(adf_vf_isr_resource_alloc);
 319
 320 int __init adf_init_vf_wq(void)
 321 {
 322         adf_vf_stop_wq = create_workqueue("adf_vf_stop_wq");
 323
 324         return !adf_vf_stop_wq ? -EFAULT : 0;
 325 }
 326
 327 void __exit adf_exit_vf_wq(void)
 328 {
 329         if (adf_vf_stop_wq)
 330                 destroy_workqueue(adf_vf_stop_wq);
 331
 332         adf_vf_stop_wq = NULL;
 333 }