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                 clear_bit(ADF_STATUS_PF_RUNNING, &accel_dev->status);
 139
 140                 stop_data = kzalloc(sizeof(*stop_data), GFP_ATOMIC);
 141                 if (!stop_data) {
 142                         dev_err(&GET_DEV(accel_dev),
 143                                 "Couldn't schedule stop for vf_%d\n",
 144                                 accel_dev->accel_id);
 145                         return;
 146                 }
 147                 stop_data->accel_dev = accel_dev;
 148                 INIT_WORK(&stop_data->work, adf_dev_stop_async);
 149                 queue_work(adf_vf_stop_wq, &stop_data->work);
 150                 /* To ack, clear the PF2VFINT bit */
 151                 msg &= ~BIT(0);
 152                 ADF_CSR_WR(pmisc_bar_addr, hw_data->get_pf2vf_offset(0), msg);
 153                 return;
 154         }
 155         case ADF_PF2VF_MSGTYPE_VERSION_RESP:
 156                 dev_dbg(&GET_DEV(accel_dev),
 157                         "Version resp received from PF 0x%x\n", msg);
 158                 accel_dev->vf.pf_version =
 159                         (msg & ADF_PF2VF_VERSION_RESP_VERS_MASK) >>
 160                         ADF_PF2VF_VERSION_RESP_VERS_SHIFT;
 161                 accel_dev->vf.compatible =
 162                         (msg & ADF_PF2VF_VERSION_RESP_RESULT_MASK) >>
 163                         ADF_PF2VF_VERSION_RESP_RESULT_SHIFT;
 164                 complete(&accel_dev->vf.iov_msg_completion);
 165                 break;
 166         default:
 167                 goto err;
 168         }
 169
 170         /* To ack, clear the PF2VFINT bit */
 171         msg &= ~BIT(0);
 172         ADF_CSR_WR(pmisc_bar_addr, hw_data->get_pf2vf_offset(0), msg);
 173
 174         /* Re-enable PF2VF interrupts */
 175         adf_enable_pf2vf_interrupts(accel_dev);
 176         return;
 177 err:
 178         dev_err(&GET_DEV(accel_dev),
 179                 "Unknown message from PF (0x%x); leaving PF2VF ints disabled\n",
 180                 msg);
 181 }
 182
 183 static int adf_setup_pf2vf_bh(struct adf_accel_dev *accel_dev)
 184 {
 185         tasklet_init(&accel_dev->vf.pf2vf_bh_tasklet,
 186                      (void *)adf_pf2vf_bh_handler, (unsigned long)accel_dev);
 187
 188         mutex_init(&accel_dev->vf.vf2pf_lock);
 189         return 0;
 190 }
 191
 192 static void adf_cleanup_pf2vf_bh(struct adf_accel_dev *accel_dev)
 193 {
 194         tasklet_disable(&accel_dev->vf.pf2vf_bh_tasklet);
 195         tasklet_kill(&accel_dev->vf.pf2vf_bh_tasklet);
 196         mutex_destroy(&accel_dev->vf.vf2pf_lock);
 197 }
 198
 199 static irqreturn_t adf_isr(int irq, void *privdata)
 200 {
 201         struct adf_accel_dev *accel_dev = privdata;
 202         struct adf_hw_device_data *hw_data = accel_dev->hw_device;
 203         struct adf_bar *pmisc =
 204                         &GET_BARS(accel_dev)[hw_data->get_misc_bar_id(hw_data)];
 205         void __iomem *pmisc_bar_addr = pmisc->virt_addr;
 206         u32 v_int;
 207
 208         /* Read VF INT source CSR to determine the source of VF interrupt */
 209         v_int = ADF_CSR_RD(pmisc_bar_addr, ADF_VINTSOU_OFFSET);
 210
 211         /* Check for PF2VF interrupt */
 212         if (v_int & ADF_VINTSOU_PF2VF) {
 213                 /* Disable PF to VF interrupt */
 214                 adf_disable_pf2vf_interrupts(accel_dev);
 215
 216                 /* Schedule tasklet to handle interrupt BH */
 217                 tasklet_hi_schedule(&accel_dev->vf.pf2vf_bh_tasklet);
 218                 return IRQ_HANDLED;
 219         }
 220
 221         /* Check bundle interrupt */
 222         if (v_int & ADF_VINTSOU_BUN) {
 223                 struct adf_etr_data *etr_data = accel_dev->transport;
 224                 struct adf_etr_bank_data *bank = &etr_data->banks[0];
 225
 226                 /* Disable Flag and Coalesce Ring Interrupts */
 227                 WRITE_CSR_INT_FLAG_AND_COL(bank->csr_addr, bank->bank_number,
 228                                            0);
 229                 tasklet_hi_schedule(&bank->resp_handler);
 230                 return IRQ_HANDLED;
 231         }
 232
 233         return IRQ_NONE;
 234 }
 235
 236 static int adf_request_msi_irq(struct adf_accel_dev *accel_dev)
 237 {
 238         struct pci_dev *pdev = accel_to_pci_dev(accel_dev);
 239         unsigned int cpu;
 240         int ret;
 241
 242         snprintf(accel_dev->vf.irq_name, ADF_MAX_MSIX_VECTOR_NAME,
 243                  "qat_%02x:%02d.%02d", pdev->bus->number, PCI_SLOT(pdev->devfn),
 244                  PCI_FUNC(pdev->devfn));
 245         ret = request_irq(pdev->irq, adf_isr, 0, accel_dev->vf.irq_name,
 246                           (void *)accel_dev);
 247         if (ret) {
 248                 dev_err(&GET_DEV(accel_dev), "failed to enable irq for %s\n",
 249                         accel_dev->vf.irq_name);
 250                 return ret;
 251         }
 252         cpu = accel_dev->accel_id % num_online_cpus();
 253         irq_set_affinity_hint(pdev->irq, get_cpu_mask(cpu));
 254
 255         return ret;
 256 }
 257
 258 static int adf_setup_bh(struct adf_accel_dev *accel_dev)
 259 {
 260         struct adf_etr_data *priv_data = accel_dev->transport;
 261
 262         tasklet_init(&priv_data->banks[0].resp_handler, adf_response_handler,
 263                      (unsigned long)priv_data->banks);
 264         return 0;
 265 }
 266
 267 static void adf_cleanup_bh(struct adf_accel_dev *accel_dev)
 268 {
 269         struct adf_etr_data *priv_data = accel_dev->transport;
 270
 271         tasklet_disable(&priv_data->banks[0].resp_handler);
 272         tasklet_kill(&priv_data->banks[0].resp_handler);
 273 }
 274
 275 /**
 276  * adf_vf_isr_resource_free() - Free IRQ for acceleration device
 277  * @accel_dev:  Pointer to acceleration device.
 278  *
 279  * Function frees interrupts for acceleration device virtual function.
 280  */
 281 void adf_vf_isr_resource_free(struct adf_accel_dev *accel_dev)
 282 {
 283         struct pci_dev *pdev = accel_to_pci_dev(accel_dev);
 284
 285         irq_set_affinity_hint(pdev->irq, NULL);
 286         free_irq(pdev->irq, (void *)accel_dev);
 287         adf_cleanup_bh(accel_dev);
 288         adf_cleanup_pf2vf_bh(accel_dev);
 289         adf_disable_msi(accel_dev);
 290 }
 291 EXPORT_SYMBOL_GPL(adf_vf_isr_resource_free);
 292
 293 /**
 294  * adf_vf_isr_resource_alloc() - Allocate IRQ for acceleration device
 295  * @accel_dev:  Pointer to acceleration device.
 296  *
 297  * Function allocates interrupts for acceleration device virtual function.
 298  *
 299  * Return: 0 on success, error code otherwise.
 300  */
 301 int adf_vf_isr_resource_alloc(struct adf_accel_dev *accel_dev)
 302 {
 303         if (adf_enable_msi(accel_dev))
 304                 goto err_out;
 305
 306         if (adf_setup_pf2vf_bh(accel_dev))
 307                 goto err_out;
 308
 309         if (adf_setup_bh(accel_dev))
 310                 goto err_out;
 311
 312         if (adf_request_msi_irq(accel_dev))
 313                 goto err_out;
 314
 315         return 0;
 316 err_out:
 317         adf_vf_isr_resource_free(accel_dev);
 318         return -EFAULT;
 319 }
 320 EXPORT_SYMBOL_GPL(adf_vf_isr_resource_alloc);
 321
 322 int __init adf_init_vf_wq(void)
 323 {
 324         adf_vf_stop_wq = create_workqueue("adf_vf_stop_wq");
 325
 326         return !adf_vf_stop_wq ? -EFAULT : 0;
 327 }
 328
 329 void __exit adf_exit_vf_wq(void)
 330 {
 331         if (adf_vf_stop_wq)
 332                 destroy_workqueue(adf_vf_stop_wq);
 333
 334         adf_vf_stop_wq = NULL;
 335 }