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 "adf_accel_devices.h"
  55 #include "adf_common_drv.h"
  56 #include "adf_cfg.h"
  57 #include "adf_cfg_strings.h"
  58 #include "adf_cfg_common.h"
  59 #include "adf_transport_access_macros.h"
  60 #include "adf_transport_internal.h"
  61 #include "adf_pf2vf_msg.h"
  62
  63 #define ADF_VINTSOU_OFFSET      0x204
  64 #define ADF_VINTSOU_BUN         BIT(0)
  65 #define ADF_VINTSOU_PF2VF       BIT(1)
  66
  67 static int adf_enable_msi(struct adf_accel_dev *accel_dev)
  68 {
  69         struct adf_accel_pci *pci_dev_info = &accel_dev->accel_pci_dev;
  70         int stat = pci_enable_msi(pci_dev_info->pci_dev);
  71
  72         if (stat) {
  73                 dev_err(&GET_DEV(accel_dev),
  74                         "Failed to enable MSI interrupts\n");
  75                 return stat;
  76         }
  77
  78         accel_dev->vf.irq_name = kzalloc(ADF_MAX_MSIX_VECTOR_NAME, GFP_KERNEL);
  79         if (!accel_dev->vf.irq_name)
  80                 return -ENOMEM;
  81
  82         return stat;
  83 }
  84
  85 static void adf_disable_msi(struct adf_accel_dev *accel_dev)
  86 {
  87         struct pci_dev *pdev = accel_to_pci_dev(accel_dev);
  88
  89         kfree(accel_dev->vf.irq_name);
  90         pci_disable_msi(pdev);
  91 }
  92
  93 static void adf_pf2vf_bh_handler(void *data)
  94 {
  95         struct adf_accel_dev *accel_dev = data;
  96         struct adf_hw_device_data *hw_data = accel_dev->hw_device;
  97         struct adf_bar *pmisc =
  98                         &GET_BARS(accel_dev)[hw_data->get_misc_bar_id(hw_data)];
  99         void __iomem *pmisc_bar_addr = pmisc->virt_addr;
 100         u32 msg;
 101
 102         /* Read the message from PF */
 103         msg = ADF_CSR_RD(pmisc_bar_addr, hw_data->get_pf2vf_offset(0));
 104
 105         if (!(msg & ADF_PF2VF_MSGORIGIN_SYSTEM))
 106                 /* Ignore legacy non-system (non-kernel) PF2VF messages */
 107                 goto err;
 108
 109         switch ((msg & ADF_PF2VF_MSGTYPE_MASK) >> ADF_PF2VF_MSGTYPE_SHIFT) {
 110         case ADF_PF2VF_MSGTYPE_RESTARTING:
 111                 dev_dbg(&GET_DEV(accel_dev),
 112                         "Restarting msg received from PF 0x%x\n", msg);
 113                 adf_dev_stop(accel_dev);
 114                 break;
 115         case ADF_PF2VF_MSGTYPE_VERSION_RESP:
 116                 dev_dbg(&GET_DEV(accel_dev),
 117                         "Version resp received from PF 0x%x\n", msg);
 118                 accel_dev->vf.pf_version =
 119                         (msg & ADF_PF2VF_VERSION_RESP_VERS_MASK) >>
 120                         ADF_PF2VF_VERSION_RESP_VERS_SHIFT;
 121                 accel_dev->vf.compatible =
 122                         (msg & ADF_PF2VF_VERSION_RESP_RESULT_MASK) >>
 123                         ADF_PF2VF_VERSION_RESP_RESULT_SHIFT;
 124                 complete(&accel_dev->vf.iov_msg_completion);
 125                 break;
 126         default:
 127                 goto err;
 128         }
 129
 130         /* To ack, clear the PF2VFINT bit */
 131         msg &= ~BIT(0);
 132         ADF_CSR_WR(pmisc_bar_addr, hw_data->get_pf2vf_offset(0), msg);
 133
 134         /* Re-enable PF2VF interrupts */
 135         adf_enable_pf2vf_interrupts(accel_dev);
 136         return;
 137 err:
 138         dev_err(&GET_DEV(accel_dev),
 139                 "Unknown message from PF (0x%x); leaving PF2VF ints disabled\n",
 140                 msg);
 141 }
 142
 143 static int adf_setup_pf2vf_bh(struct adf_accel_dev *accel_dev)
 144 {
 145         tasklet_init(&accel_dev->vf.pf2vf_bh_tasklet,
 146                      (void *)adf_pf2vf_bh_handler, (unsigned long)accel_dev);
 147
 148         mutex_init(&accel_dev->vf.vf2pf_lock);
 149         return 0;
 150 }
 151
 152 static void adf_cleanup_pf2vf_bh(struct adf_accel_dev *accel_dev)
 153 {
 154         tasklet_disable(&accel_dev->vf.pf2vf_bh_tasklet);
 155         tasklet_kill(&accel_dev->vf.pf2vf_bh_tasklet);
 156         mutex_destroy(&accel_dev->vf.vf2pf_lock);
 157 }
 158
 159 static irqreturn_t adf_isr(int irq, void *privdata)
 160 {
 161         struct adf_accel_dev *accel_dev = privdata;
 162         struct adf_hw_device_data *hw_data = accel_dev->hw_device;
 163         struct adf_bar *pmisc =
 164                         &GET_BARS(accel_dev)[hw_data->get_misc_bar_id(hw_data)];
 165         void __iomem *pmisc_bar_addr = pmisc->virt_addr;
 166         u32 v_int;
 167
 168         /* Read VF INT source CSR to determine the source of VF interrupt */
 169         v_int = ADF_CSR_RD(pmisc_bar_addr, ADF_VINTSOU_OFFSET);
 170
 171         /* Check for PF2VF interrupt */
 172         if (v_int & ADF_VINTSOU_PF2VF) {
 173                 /* Disable PF to VF interrupt */
 174                 adf_disable_pf2vf_interrupts(accel_dev);
 175
 176                 /* Schedule tasklet to handle interrupt BH */
 177                 tasklet_hi_schedule(&accel_dev->vf.pf2vf_bh_tasklet);
 178                 return IRQ_HANDLED;
 179         }
 180
 181         /* Check bundle interrupt */
 182         if (v_int & ADF_VINTSOU_BUN) {
 183                 struct adf_etr_data *etr_data = accel_dev->transport;
 184                 struct adf_etr_bank_data *bank = &etr_data->banks[0];
 185
 186                 /* Disable Flag and Coalesce Ring Interrupts */
 187                 WRITE_CSR_INT_FLAG_AND_COL(bank->csr_addr, bank->bank_number,
 188                                            0);
 189                 tasklet_hi_schedule(&bank->resp_handler);
 190                 return IRQ_HANDLED;
 191         }
 192
 193         return IRQ_NONE;
 194 }
 195
 196 static int adf_request_msi_irq(struct adf_accel_dev *accel_dev)
 197 {
 198         struct pci_dev *pdev = accel_to_pci_dev(accel_dev);
 199         unsigned int cpu;
 200         int ret;
 201
 202         snprintf(accel_dev->vf.irq_name, ADF_MAX_MSIX_VECTOR_NAME,
 203                  "qat_%02x:%02d.%02d", pdev->bus->number, PCI_SLOT(pdev->devfn),
 204                  PCI_FUNC(pdev->devfn));
 205         ret = request_irq(pdev->irq, adf_isr, 0, accel_dev->vf.irq_name,
 206                           (void *)accel_dev);
 207         if (ret) {
 208                 dev_err(&GET_DEV(accel_dev), "failed to enable irq for %s\n",
 209                         accel_dev->vf.irq_name);
 210                 return ret;
 211         }
 212         cpu = accel_dev->accel_id % num_online_cpus();
 213         irq_set_affinity_hint(pdev->irq, get_cpu_mask(cpu));
 214
 215         return ret;
 216 }
 217
 218 static int adf_setup_bh(struct adf_accel_dev *accel_dev)
 219 {
 220         struct adf_etr_data *priv_data = accel_dev->transport;
 221
 222         tasklet_init(&priv_data->banks[0].resp_handler, adf_response_handler,
 223                      (unsigned long)priv_data->banks);
 224         return 0;
 225 }
 226
 227 static void adf_cleanup_bh(struct adf_accel_dev *accel_dev)
 228 {
 229         struct adf_etr_data *priv_data = accel_dev->transport;
 230
 231         tasklet_disable(&priv_data->banks[0].resp_handler);
 232         tasklet_kill(&priv_data->banks[0].resp_handler);
 233 }
 234
 235 /**
 236  * adf_vf_isr_resource_free() - Free IRQ for acceleration device
 237  * @accel_dev:  Pointer to acceleration device.
 238  *
 239  * Function frees interrupts for acceleration device virtual function.
 240  */
 241 void adf_vf_isr_resource_free(struct adf_accel_dev *accel_dev)
 242 {
 243         struct pci_dev *pdev = accel_to_pci_dev(accel_dev);
 244
 245         irq_set_affinity_hint(pdev->irq, NULL);
 246         free_irq(pdev->irq, (void *)accel_dev);
 247         adf_cleanup_bh(accel_dev);
 248         adf_cleanup_pf2vf_bh(accel_dev);
 249         adf_disable_msi(accel_dev);
 250 }
 251 EXPORT_SYMBOL_GPL(adf_vf_isr_resource_free);
 252
 253 /**
 254  * adf_vf_isr_resource_alloc() - Allocate IRQ for acceleration device
 255  * @accel_dev:  Pointer to acceleration device.
 256  *
 257  * Function allocates interrupts for acceleration device virtual function.
 258  *
 259  * Return: 0 on success, error code otherwise.
 260  */
 261 int adf_vf_isr_resource_alloc(struct adf_accel_dev *accel_dev)
 262 {
 263         if (adf_enable_msi(accel_dev))
 264                 goto err_out;
 265
 266         if (adf_setup_pf2vf_bh(accel_dev))
 267                 goto err_out;
 268
 269         if (adf_setup_bh(accel_dev))
 270                 goto err_out;
 271
 272         if (adf_request_msi_irq(accel_dev))
 273                 goto err_out;
 274
 275         return 0;
 276 err_out:
 277         adf_vf_isr_resource_free(accel_dev);
 278         return -EFAULT;
 279 }
 280 EXPORT_SYMBOL_GPL(adf_vf_isr_resource_alloc);