drivers/crypto/qat/qat_common/adf_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 "adf_accel_devices.h"
  11 #include "adf_common_drv.h"
  12 #include "adf_cfg.h"
  13 #include "adf_cfg_strings.h"
  14 #include "adf_cfg_common.h"
  15 #include "adf_transport_access_macros.h"
  16 #include "adf_transport_internal.h"
  17
  18 static int adf_enable_msix(struct adf_accel_dev *accel_dev)
  19 {
  20         struct adf_accel_pci *pci_dev_info = &accel_dev->accel_pci_dev;
  21         struct adf_hw_device_data *hw_data = accel_dev->hw_device;
  22         u32 msix_num_entries = 1;
  23
  24         if (hw_data->set_msix_rttable)
  25                 hw_data->set_msix_rttable(accel_dev);
  26
  27         /* If SR-IOV is disabled, add entries for each bank */
  28         if (!accel_dev->pf.vf_info) {
  29                 int i;
  30
  31                 msix_num_entries += hw_data->num_banks;
  32                 for (i = 0; i < msix_num_entries; i++)
  33                         pci_dev_info->msix_entries.entries[i].entry = i;
  34         } else {
  35                 pci_dev_info->msix_entries.entries[0].entry =
  36                         hw_data->num_banks;
  37         }
  38
  39         if (pci_enable_msix_exact(pci_dev_info->pci_dev,
  40                                   pci_dev_info->msix_entries.entries,
  41                                   msix_num_entries)) {
  42                 dev_err(&GET_DEV(accel_dev), "Failed to enable MSI-X IRQ(s)\n");
  43                 return -EFAULT;
  44         }
  45         return 0;
  46 }
  47
  48 static void adf_disable_msix(struct adf_accel_pci *pci_dev_info)
  49 {
  50         pci_disable_msix(pci_dev_info->pci_dev);
  51 }
  52
  53 static irqreturn_t adf_msix_isr_bundle(int irq, void *bank_ptr)
  54 {
  55         struct adf_etr_bank_data *bank = bank_ptr;
  56         struct adf_hw_csr_ops *csr_ops = GET_CSR_OPS(bank->accel_dev);
  57
  58         csr_ops->write_csr_int_flag_and_col(bank->csr_addr, bank->bank_number,
  59                                             0);
  60         tasklet_hi_schedule(&bank->resp_handler);
  61         return IRQ_HANDLED;
  62 }
  63
  64 static irqreturn_t adf_msix_isr_ae(int irq, void *dev_ptr)
  65 {
  66         struct adf_accel_dev *accel_dev = dev_ptr;
  67
  68 #ifdef CONFIG_PCI_IOV
  69         /* If SR-IOV is enabled (vf_info is non-NULL), check for VF->PF ints */
  70         if (accel_dev->pf.vf_info) {
  71                 struct adf_hw_device_data *hw_data = accel_dev->hw_device;
  72                 struct adf_bar *pmisc =
  73                         &GET_BARS(accel_dev)[hw_data->get_misc_bar_id(hw_data)];
  74                 void __iomem *pmisc_bar_addr = pmisc->virt_addr;
  75                 u32 vf_mask;
  76
  77                 /* Get the interrupt sources triggered by VFs */
  78                 vf_mask = ((ADF_CSR_RD(pmisc_bar_addr, ADF_ERRSOU5) &
  79                             0x0000FFFF) << 16) |
  80                           ((ADF_CSR_RD(pmisc_bar_addr, ADF_ERRSOU3) &
  81                             0x01FFFE00) >> 9);
  82
  83                 if (vf_mask) {
  84                         struct adf_accel_vf_info *vf_info;
  85                         bool irq_handled = false;
  86                         int i;
  87
  88                         /* Disable VF2PF interrupts for VFs with pending ints */
  89                         adf_disable_vf2pf_interrupts(accel_dev, vf_mask);
  90
  91                         /*
  92                          * Schedule tasklets to handle VF2PF interrupt BHs
  93                          * unless the VF is malicious and is attempting to
  94                          * flood the host OS with VF2PF interrupts.
  95                          */
  96                         for_each_set_bit(i, (const unsigned long *)&vf_mask,
  97                                          (sizeof(vf_mask) * BITS_PER_BYTE)) {
  98                                 vf_info = accel_dev->pf.vf_info + i;
  99
 100                                 if (!__ratelimit(&vf_info->vf2pf_ratelimit)) {
 101                                         dev_info(&GET_DEV(accel_dev),
 102                                                  "Too many ints from VF%d\n",
 103                                                   vf_info->vf_nr + 1);
 104                                         continue;
 105                                 }
 106
 107                                 /* Tasklet will re-enable ints from this VF */
 108                                 tasklet_hi_schedule(&vf_info->vf2pf_bh_tasklet);
 109                                 irq_handled = true;
 110                         }
 111
 112                         if (irq_handled)
 113                                 return IRQ_HANDLED;
 114                 }
 115         }
 116 #endif /* CONFIG_PCI_IOV */
 117
 118         dev_dbg(&GET_DEV(accel_dev), "qat_dev%d spurious AE interrupt\n",
 119                 accel_dev->accel_id);
 120
 121         return IRQ_NONE;
 122 }
 123
 124 static int adf_request_irqs(struct adf_accel_dev *accel_dev)
 125 {
 126         struct adf_accel_pci *pci_dev_info = &accel_dev->accel_pci_dev;
 127         struct adf_hw_device_data *hw_data = accel_dev->hw_device;
 128         struct msix_entry *msixe = pci_dev_info->msix_entries.entries;
 129         struct adf_etr_data *etr_data = accel_dev->transport;
 130         int ret, i = 0;
 131         char *name;
 132
 133         /* Request msix irq for all banks unless SR-IOV enabled */
 134         if (!accel_dev->pf.vf_info) {
 135                 for (i = 0; i < hw_data->num_banks; i++) {
 136                         struct adf_etr_bank_data *bank = &etr_data->banks[i];
 137                         unsigned int cpu, cpus = num_online_cpus();
 138
 139                         name = *(pci_dev_info->msix_entries.names + i);
 140                         snprintf(name, ADF_MAX_MSIX_VECTOR_NAME,
 141                                  "qat%d-bundle%d", accel_dev->accel_id, i);
 142                         ret = request_irq(msixe[i].vector,
 143                                           adf_msix_isr_bundle, 0, name, bank);
 144                         if (ret) {
 145                                 dev_err(&GET_DEV(accel_dev),
 146                                         "failed to enable irq %d for %s\n",
 147                                         msixe[i].vector, name);
 148                                 return ret;
 149                         }
 150
 151                         cpu = ((accel_dev->accel_id * hw_data->num_banks) +
 152                                i) % cpus;
 153                         irq_set_affinity_hint(msixe[i].vector,
 154                                               get_cpu_mask(cpu));
 155                 }
 156         }
 157
 158         /* Request msix irq for AE */
 159         name = *(pci_dev_info->msix_entries.names + i);
 160         snprintf(name, ADF_MAX_MSIX_VECTOR_NAME,
 161                  "qat%d-ae-cluster", accel_dev->accel_id);
 162         ret = request_irq(msixe[i].vector, adf_msix_isr_ae, 0, name, accel_dev);
 163         if (ret) {
 164                 dev_err(&GET_DEV(accel_dev),
 165                         "failed to enable irq %d, for %s\n",
 166                         msixe[i].vector, name);
 167                 return ret;
 168         }
 169         return ret;
 170 }
 171
 172 static void adf_free_irqs(struct adf_accel_dev *accel_dev)
 173 {
 174         struct adf_accel_pci *pci_dev_info = &accel_dev->accel_pci_dev;
 175         struct adf_hw_device_data *hw_data = accel_dev->hw_device;
 176         struct msix_entry *msixe = pci_dev_info->msix_entries.entries;
 177         struct adf_etr_data *etr_data = accel_dev->transport;
 178         int i = 0;
 179
 180         if (pci_dev_info->msix_entries.num_entries > 1) {
 181                 for (i = 0; i < hw_data->num_banks; i++) {
 182                         irq_set_affinity_hint(msixe[i].vector, NULL);
 183                         free_irq(msixe[i].vector, &etr_data->banks[i]);
 184                 }
 185         }
 186         irq_set_affinity_hint(msixe[i].vector, NULL);
 187         free_irq(msixe[i].vector, accel_dev);
 188 }
 189
 190 static int adf_isr_alloc_msix_entry_table(struct adf_accel_dev *accel_dev)
 191 {
 192         int i;
 193         char **names;
 194         struct msix_entry *entries;
 195         struct adf_hw_device_data *hw_data = accel_dev->hw_device;
 196         u32 msix_num_entries = 1;
 197
 198         /* If SR-IOV is disabled (vf_info is NULL), add entries for each bank */
 199         if (!accel_dev->pf.vf_info)
 200                 msix_num_entries += hw_data->num_banks;
 201
 202         entries = kcalloc_node(msix_num_entries, sizeof(*entries),
 203                                GFP_KERNEL, dev_to_node(&GET_DEV(accel_dev)));
 204         if (!entries)
 205                 return -ENOMEM;
 206
 207         names = kcalloc(msix_num_entries, sizeof(char *), GFP_KERNEL);
 208         if (!names) {
 209                 kfree(entries);
 210                 return -ENOMEM;
 211         }
 212         for (i = 0; i < msix_num_entries; i++) {
 213                 *(names + i) = kzalloc(ADF_MAX_MSIX_VECTOR_NAME, GFP_KERNEL);
 214                 if (!(*(names + i)))
 215                         goto err;
 216         }
 217         accel_dev->accel_pci_dev.msix_entries.num_entries = msix_num_entries;
 218         accel_dev->accel_pci_dev.msix_entries.entries = entries;
 219         accel_dev->accel_pci_dev.msix_entries.names = names;
 220         return 0;
 221 err:
 222         for (i = 0; i < msix_num_entries; i++)
 223                 kfree(*(names + i));
 224         kfree(entries);
 225         kfree(names);
 226         return -ENOMEM;
 227 }
 228
 229 static void adf_isr_free_msix_entry_table(struct adf_accel_dev *accel_dev)
 230 {
 231         char **names = accel_dev->accel_pci_dev.msix_entries.names;
 232         int i;
 233
 234         kfree(accel_dev->accel_pci_dev.msix_entries.entries);
 235         for (i = 0; i < accel_dev->accel_pci_dev.msix_entries.num_entries; i++)
 236                 kfree(*(names + i));
 237         kfree(names);
 238 }
 239
 240 static int adf_setup_bh(struct adf_accel_dev *accel_dev)
 241 {
 242         struct adf_etr_data *priv_data = accel_dev->transport;
 243         struct adf_hw_device_data *hw_data = accel_dev->hw_device;
 244         int i;
 245
 246         for (i = 0; i < hw_data->num_banks; i++)
 247                 tasklet_init(&priv_data->banks[i].resp_handler,
 248                              adf_response_handler,
 249                              (unsigned long)&priv_data->banks[i]);
 250         return 0;
 251 }
 252
 253 static void adf_cleanup_bh(struct adf_accel_dev *accel_dev)
 254 {
 255         struct adf_etr_data *priv_data = accel_dev->transport;
 256         struct adf_hw_device_data *hw_data = accel_dev->hw_device;
 257         int i;
 258
 259         for (i = 0; i < hw_data->num_banks; i++) {
 260                 tasklet_disable(&priv_data->banks[i].resp_handler);
 261                 tasklet_kill(&priv_data->banks[i].resp_handler);
 262         }
 263 }
 264
 265 /**
 266  * adf_isr_resource_free() - Free IRQ for acceleration device
 267  * @accel_dev:  Pointer to acceleration device.
 268  *
 269  * Function frees interrupts for acceleration device.
 270  */
 271 void adf_isr_resource_free(struct adf_accel_dev *accel_dev)
 272 {
 273         adf_free_irqs(accel_dev);
 274         adf_cleanup_bh(accel_dev);
 275         adf_disable_msix(&accel_dev->accel_pci_dev);
 276         adf_isr_free_msix_entry_table(accel_dev);
 277 }
 278 EXPORT_SYMBOL_GPL(adf_isr_resource_free);
 279
 280 /**
 281  * adf_isr_resource_alloc() - Allocate IRQ for acceleration device
 282  * @accel_dev:  Pointer to acceleration device.
 283  *
 284  * Function allocates interrupts for acceleration device.
 285  *
 286  * Return: 0 on success, error code otherwise.
 287  */
 288 int adf_isr_resource_alloc(struct adf_accel_dev *accel_dev)
 289 {
 290         int ret;
 291
 292         ret = adf_isr_alloc_msix_entry_table(accel_dev);
 293         if (ret)
 294                 return ret;
 295         if (adf_enable_msix(accel_dev))
 296                 goto err_out;
 297
 298         if (adf_setup_bh(accel_dev))
 299                 goto err_out;
 300
 301         if (adf_request_irqs(accel_dev))
 302                 goto err_out;
 303
 304         return 0;
 305 err_out:
 306         adf_isr_resource_free(accel_dev);
 307         return -EFAULT;
 308 }
 309 EXPORT_SYMBOL_GPL(adf_isr_resource_alloc);