d785ed945d
WWAN device is programmed to boot in normal mode or fastboot mode,
when triggering a device reset through ACPI call or fastboot switch
command. Maintain state machine synchronization and reprobe logic
after a device reset.
The PCIe device reset triggered by several ways.
E.g.:
- fastboot: echo "fastboot_switching" > /sys/bus/pci/devices/${bdf}/t7xx_mode.
- reset: echo "reset" > /sys/bus/pci/devices/${bdf}/t7xx_mode.
- IRQ: PCIe device request driver to reset itself by an interrupt request.
Use pci_reset_function() as a generic way to reset device, save and
restore the PCIe configuration before and after reset device to ensure
the reprobe process.
Suggestion from Bjorn:
Link: https://lore.kernel.org/all/20230127133034.GA1364550@bhelgaas/
Signed-off-by: Jinjian Song <jinjian.song@fibocom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
118 lines
2.9 KiB
C
118 lines
2.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2022 Intel Corporation.
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*/
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#include <linux/debugfs.h>
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#include <linux/relay.h>
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#include <linux/skbuff.h>
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#include <linux/wwan.h>
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#include "t7xx_port.h"
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#include "t7xx_port_proxy.h"
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#include "t7xx_state_monitor.h"
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#define T7XX_TRC_SUB_BUFF_SIZE 131072
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#define T7XX_TRC_N_SUB_BUFF 32
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static struct dentry *t7xx_trace_create_buf_file_handler(const char *filename,
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struct dentry *parent,
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umode_t mode,
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struct rchan_buf *buf,
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int *is_global)
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{
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*is_global = 1;
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return debugfs_create_file(filename, mode, parent, buf,
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&relay_file_operations);
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}
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static int t7xx_trace_remove_buf_file_handler(struct dentry *dentry)
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{
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debugfs_remove(dentry);
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return 0;
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}
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static int t7xx_trace_subbuf_start_handler(struct rchan_buf *buf, void *subbuf,
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void *prev_subbuf, size_t prev_padding)
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{
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if (relay_buf_full(buf)) {
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pr_err_ratelimited("Relay_buf full dropping traces");
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return 0;
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}
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return 1;
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}
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static struct rchan_callbacks relay_callbacks = {
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.subbuf_start = t7xx_trace_subbuf_start_handler,
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.create_buf_file = t7xx_trace_create_buf_file_handler,
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.remove_buf_file = t7xx_trace_remove_buf_file_handler,
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};
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static void t7xx_trace_port_uninit(struct t7xx_port *port)
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{
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struct dentry *debugfs_dir = port->t7xx_dev->debugfs_dir;
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struct rchan *relaych = port->log.relaych;
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if (!relaych)
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return;
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relay_close(relaych);
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debugfs_remove_recursive(debugfs_dir);
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port->log.relaych = NULL;
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}
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static int t7xx_trace_port_recv_skb(struct t7xx_port *port, struct sk_buff *skb)
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{
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struct rchan *relaych = port->log.relaych;
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if (!relaych)
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return -EINVAL;
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relay_write(relaych, skb->data, skb->len);
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dev_kfree_skb(skb);
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return 0;
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}
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static void t7xx_port_trace_md_state_notify(struct t7xx_port *port, unsigned int state)
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{
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struct rchan *relaych = port->log.relaych;
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struct dentry *debugfs_wwan_dir;
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struct dentry *debugfs_dir;
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if (state != MD_STATE_READY || relaych)
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return;
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debugfs_wwan_dir = wwan_get_debugfs_dir(port->dev);
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if (IS_ERR(debugfs_wwan_dir))
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return;
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debugfs_dir = debugfs_create_dir(KBUILD_MODNAME, debugfs_wwan_dir);
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if (IS_ERR_OR_NULL(debugfs_dir)) {
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wwan_put_debugfs_dir(debugfs_wwan_dir);
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dev_err(port->dev, "Unable to create debugfs for trace");
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return;
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}
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relaych = relay_open("relay_ch", debugfs_dir, T7XX_TRC_SUB_BUFF_SIZE,
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T7XX_TRC_N_SUB_BUFF, &relay_callbacks, NULL);
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if (!relaych)
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goto err_rm_debugfs_dir;
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wwan_put_debugfs_dir(debugfs_wwan_dir);
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port->log.relaych = relaych;
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port->t7xx_dev->debugfs_dir = debugfs_dir;
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return;
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err_rm_debugfs_dir:
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debugfs_remove_recursive(debugfs_dir);
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wwan_put_debugfs_dir(debugfs_wwan_dir);
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dev_err(port->dev, "Unable to create trace port %s", port->port_conf->name);
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}
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struct port_ops t7xx_trace_port_ops = {
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.recv_skb = t7xx_trace_port_recv_skb,
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.uninit = t7xx_trace_port_uninit,
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.md_state_notify = t7xx_port_trace_md_state_notify,
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};
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