adf_c4xxx_reset.c

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    1 /* SPDX-License-Identifier: BSD-3-Clause */
    2 /* Copyright(c) 2007-2022 Intel Corporation */
    3 /* $FreeBSD$ */
    4 #include <dev/pci/pcireg.h>
    5 #include "adf_c4xxx_reset.h"
    6 
    7 static void
    8 adf_check_uncorr_status(struct adf_accel_dev *accel_dev)
    9 {
   10         u32 uncorr_err;
   11         device_t pdev = accel_dev->accel_pci_dev.pci_dev;
   12 
   13         uncorr_err = pci_read_config(pdev, PCI_EXP_AERUCS, 4);
   14         if (uncorr_err & PCIE_C4XXX_VALID_ERR_MASK) {
   15                 device_printf(GET_DEV(accel_dev),
   16                               "Uncorrectable error occurred during reset\n");
   17                 device_printf(GET_DEV(accel_dev),
   18                               "Error code value: 0x%04x\n",
   19                               uncorr_err);
   20         }
   21 }
   22 
   23 static void
   24 adf_c4xxx_dev_reset(struct adf_accel_dev *accel_dev)
   25 {
   26         device_t pdev = accel_dev->accel_pci_dev.pci_dev;
   27         struct adf_hw_device_data *hw_device = accel_dev->hw_device;
   28         u8 count = 0;
   29         uintptr_t device_id1;
   30         uintptr_t device_id2;
   31 
   32         /* Read device ID before triggering reset */
   33         device_id1 = pci_read_config(pdev, PCIR_DEVICE, 2);
   34         hw_device->reset_device(accel_dev);
   35 
   36         /* Wait for reset to complete */
   37         do {
   38                 /* Ensure we have the configuration space restored */
   39                 device_id2 = pci_read_config(pdev, PCIR_DEVICE, 2);
   40                 if (device_id1 == device_id2) {
   41                         /* Check if a PCIe uncorrectable error occurred
   42                          * during the reset
   43                          */
   44                         adf_check_uncorr_status(accel_dev);
   45                         return;
   46                 }
   47                 count++;
   48                 pause_ms("adfstop", 100);
   49         } while (count < ADF_PCIE_FLR_ATTEMPT);
   50         device_printf(GET_DEV(accel_dev),
   51                       "Too many attempts to read back config space.\n");
   52 }
   53 
   54 void
   55 adf_c4xxx_dev_restore(struct adf_accel_dev *accel_dev)
   56 {
   57         struct adf_hw_device_data *hw_device = accel_dev->hw_device;
   58         device_t pdev = accel_dev->accel_pci_dev.pci_dev;
   59         u32 pmisclbar1;
   60         u32 pmisclbar2;
   61         u32 pmiscubar1;
   62         u32 pmiscubar2;
   63 
   64         if (hw_device->reset_device) {
   65                 device_printf(GET_DEV(accel_dev),
   66                               "Resetting device qat_dev%d\n",
   67                               accel_dev->accel_id);
   68 
   69                 /* Read pmiscubar and pmisclbar */
   70                 pmisclbar1 = pci_read_config(pdev, ADF_PMISC_L_OFFSET, 4);
   71                 pmiscubar1 = pci_read_config(pdev, ADF_PMISC_U_OFFSET, 4);
   72 
   73                 adf_c4xxx_dev_reset(accel_dev);
   74                 pci_restore_state(pdev);
   75 
   76                 /* Read pmiscubar and pmisclbar */
   77                 pmisclbar2 = pci_read_config(pdev, ADF_PMISC_L_OFFSET, 4);
   78                 pmiscubar2 = pci_read_config(pdev, ADF_PMISC_U_OFFSET, 4);
   79 
   80                 /* Check if restore operation has completed successfully */
   81                 if (pmisclbar1 != pmisclbar2 || pmiscubar1 != pmiscubar2) {
   82                         device_printf(
   83                             GET_DEV(accel_dev),
   84                             "Failed to restore device configuration\n");
   85                         return;
   86                 }
   87                 pci_save_state(pdev);
   88         }
   89 
   90         if (hw_device->post_reset) {
   91                 dev_dbg(GET_DEV(accel_dev), "Performing post reset restore\n");
   92                 hw_device->post_reset(accel_dev);
   93         }
   94 }

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FreeBSD/Linux Kernel Cross Reference sys/dev/qat/qat_hw/qat_c4xxx/adf_c4xxx_reset.c

FreeBSD/Linux Kernel Cross Reference
sys/dev/qat/qat_hw/qat_c4xxx/adf_c4xxx_reset.c