Quelle  hbg_irq.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0+
// Copyright (c) 2024 Hisilicon Limited.

#include <linux/interrupt.h>
#include "hbg_irq.h"
#include "hbg_hw.h"

static void hbg_irq_handle_err(struct hbg_priv *priv,
          const struct hbg_irq_info *irq_info)
{
 if (irq_info->need_print)
  dev_err(&priv->pdev->dev,
   "receive error interrupt: %s\n", irq_info->name);

 if (irq_info->need_reset)
  hbg_err_reset_task_schedule(priv);
}

static void hbg_irq_handle_tx(struct hbg_priv *priv,
         const struct hbg_irq_info *irq_info)
{
 napi_schedule(&priv->tx_ring.napi);
}

static void hbg_irq_handle_rx(struct hbg_priv *priv,
         const struct hbg_irq_info *irq_info)
{
 napi_schedule(&priv->rx_ring.napi);
}

static void hbg_irq_handle_rx_buf_val(struct hbg_priv *priv,
          const struct hbg_irq_info *irq_info)
{
 priv->stats.rx_fifo_less_empty_thrsld_cnt++;
}

#define HBG_IRQ_I(name, handle) \
 {#name, HBG_INT_MSK_##name##_B, false, false, false, handle}
#define HBG_ERR_IRQ_I(name, need_print, ndde_reset) \
 {#name, HBG_INT_MSK_##name##_B, true, need_print, \
 ndde_reset, hbg_irq_handle_err}

static const struct hbg_irq_info hbg_irqs[] = {
 HBG_IRQ_I(RX, hbg_irq_handle_rx),
 HBG_IRQ_I(TX, hbg_irq_handle_tx),
 HBG_ERR_IRQ_I(TX_PKT_CPL, true, true),
 HBG_ERR_IRQ_I(MAC_MII_FIFO_ERR, true, true),
 HBG_ERR_IRQ_I(MAC_PCS_RX_FIFO_ERR, true, true),
 HBG_ERR_IRQ_I(MAC_PCS_TX_FIFO_ERR, true, true),
 HBG_ERR_IRQ_I(MAC_APP_RX_FIFO_ERR, true, true),
 HBG_ERR_IRQ_I(MAC_APP_TX_FIFO_ERR, true, true),
 HBG_ERR_IRQ_I(SRAM_PARITY_ERR, true, false),
 HBG_ERR_IRQ_I(TX_AHB_ERR, true, true),
 HBG_IRQ_I(RX_BUF_AVL, hbg_irq_handle_rx_buf_val),
 HBG_ERR_IRQ_I(REL_BUF_ERR, true, false),
 HBG_ERR_IRQ_I(TXCFG_AVL, false, false),
 HBG_ERR_IRQ_I(TX_DROP, false, false),
 HBG_ERR_IRQ_I(RX_DROP, false, false),
 HBG_ERR_IRQ_I(RX_AHB_ERR, true, false),
 HBG_ERR_IRQ_I(MAC_FIFO_ERR, true, true),
 HBG_ERR_IRQ_I(RBREQ_ERR, true, true),
 HBG_ERR_IRQ_I(WE_ERR, true, true),
};

static irqreturn_t hbg_irq_handle(int irq_num, void *p)
{
 const struct hbg_irq_info *info;
 struct hbg_priv *priv = p;
 u32 status;
 u32 i;

 status = hbg_hw_get_irq_status(priv);
 for (i = 0; i < priv->vectors.info_array_len; i++) {
  info = &priv->vectors.info_array[i];
  if (status & info->mask) {
   if (!hbg_hw_irq_is_enabled(priv, info->mask))
    continue;

   hbg_hw_irq_enable(priv, info->mask, false);
   hbg_hw_irq_clear(priv, info->mask);

   priv->vectors.stats_array[i]++;
   if (info->irq_handle)
    info->irq_handle(priv, info);

   if (info->re_enable)
    hbg_hw_irq_enable(priv, info->mask, true);
  }
 }

 return IRQ_HANDLED;
}

static const char *irq_names_map[HBG_VECTOR_NUM] = { "tx", "rx",
           "err", "mdio" };

int hbg_irq_init(struct hbg_priv *priv)
{
 struct hbg_vector *vectors = &priv->vectors;
 struct device *dev = &priv->pdev->dev;
 int ret, id;
 u32 i;

 /* used pcim_enable_device(),  so the vectors become device managed */
 ret = pci_alloc_irq_vectors(priv->pdev, HBG_VECTOR_NUM, HBG_VECTOR_NUM,
        PCI_IRQ_MSI | PCI_IRQ_MSIX);
 if (ret < 0)
  return dev_err_probe(dev, ret, "failed to allocate vectors\n");

 if (ret != HBG_VECTOR_NUM)
  return dev_err_probe(dev, -EINVAL,
         "requested %u MSI, but allocated %d MSI\n",
         HBG_VECTOR_NUM, ret);

 /* mdio irq not requested, so the number of requested interrupts
 * is HBG_VECTOR_NUM - 1.
 */
 for (i = 0; i < HBG_VECTOR_NUM - 1; i++) {
  id = pci_irq_vector(priv->pdev, i);
  if (id < 0)
   return dev_err_probe(dev, id, "failed to get irq id\n");

  snprintf(vectors->name[i], sizeof(vectors->name[i]), "%s-%s-%s",
    dev_driver_string(dev), pci_name(priv->pdev),
    irq_names_map[i]);

  ret = devm_request_irq(dev, id, hbg_irq_handle, 0,
           vectors->name[i], priv);
  if (ret)
   return dev_err_probe(dev, ret,
          "failed to request irq: %s\n",
          irq_names_map[i]);
 }

 vectors->stats_array = devm_kcalloc(&priv->pdev->dev,
         ARRAY_SIZE(hbg_irqs),
         sizeof(u64), GFP_KERNEL);
 if (!vectors->stats_array)
  return -ENOMEM;

 vectors->info_array = hbg_irqs;
 vectors->info_array_len = ARRAY_SIZE(hbg_irqs);
 return 0;
}