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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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dccbbaff17
This cursor is used for debugging only. But since commit "s390/qdio: pass up count of ready-to-process SBALs" it effectively duplicates the first_to_check cursor, diverging for just a short moment when get_*_buffer_frontier() updates q->first_to_check. Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com> Reviewed-by: Jens Remus <jremus@linux.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
359 lines
9.1 KiB
C
359 lines
9.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright IBM Corp. 2008, 2009
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*
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* Author: Jan Glauber (jang@linux.vnet.ibm.com)
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*/
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#include <linux/seq_file.h>
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#include <linux/debugfs.h>
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#include <linux/uaccess.h>
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#include <linux/export.h>
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#include <linux/slab.h>
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#include <asm/debug.h>
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#include "qdio_debug.h"
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#include "qdio.h"
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debug_info_t *qdio_dbf_setup;
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debug_info_t *qdio_dbf_error;
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static struct dentry *debugfs_root;
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#define QDIO_DEBUGFS_NAME_LEN 10
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#define QDIO_DBF_NAME_LEN 20
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struct qdio_dbf_entry {
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char dbf_name[QDIO_DBF_NAME_LEN];
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debug_info_t *dbf_info;
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struct list_head dbf_list;
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};
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static LIST_HEAD(qdio_dbf_list);
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static DEFINE_MUTEX(qdio_dbf_list_mutex);
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static debug_info_t *qdio_get_dbf_entry(char *name)
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{
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struct qdio_dbf_entry *entry;
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debug_info_t *rc = NULL;
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mutex_lock(&qdio_dbf_list_mutex);
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list_for_each_entry(entry, &qdio_dbf_list, dbf_list) {
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if (strcmp(entry->dbf_name, name) == 0) {
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rc = entry->dbf_info;
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break;
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}
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}
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mutex_unlock(&qdio_dbf_list_mutex);
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return rc;
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}
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static void qdio_clear_dbf_list(void)
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{
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struct qdio_dbf_entry *entry, *tmp;
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mutex_lock(&qdio_dbf_list_mutex);
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list_for_each_entry_safe(entry, tmp, &qdio_dbf_list, dbf_list) {
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list_del(&entry->dbf_list);
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debug_unregister(entry->dbf_info);
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kfree(entry);
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}
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mutex_unlock(&qdio_dbf_list_mutex);
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}
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int qdio_allocate_dbf(struct qdio_initialize *init_data,
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struct qdio_irq *irq_ptr)
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{
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char text[QDIO_DBF_NAME_LEN];
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struct qdio_dbf_entry *new_entry;
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DBF_EVENT("qfmt:%1d", init_data->q_format);
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DBF_HEX(init_data->adapter_name, 8);
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DBF_EVENT("qpff%4x", init_data->qib_param_field_format);
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DBF_HEX(&init_data->qib_param_field, sizeof(void *));
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DBF_HEX(&init_data->input_slib_elements, sizeof(void *));
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DBF_HEX(&init_data->output_slib_elements, sizeof(void *));
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DBF_EVENT("niq:%1d noq:%1d", init_data->no_input_qs,
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init_data->no_output_qs);
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DBF_HEX(&init_data->input_handler, sizeof(void *));
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DBF_HEX(&init_data->output_handler, sizeof(void *));
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DBF_HEX(&init_data->int_parm, sizeof(long));
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DBF_HEX(&init_data->input_sbal_addr_array, sizeof(void *));
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DBF_HEX(&init_data->output_sbal_addr_array, sizeof(void *));
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DBF_EVENT("irq:%8lx", (unsigned long)irq_ptr);
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/* allocate trace view for the interface */
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snprintf(text, QDIO_DBF_NAME_LEN, "qdio_%s",
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dev_name(&init_data->cdev->dev));
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irq_ptr->debug_area = qdio_get_dbf_entry(text);
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if (irq_ptr->debug_area)
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DBF_DEV_EVENT(DBF_ERR, irq_ptr, "dbf reused");
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else {
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irq_ptr->debug_area = debug_register(text, 2, 1, 16);
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if (!irq_ptr->debug_area)
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return -ENOMEM;
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if (debug_register_view(irq_ptr->debug_area,
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&debug_hex_ascii_view)) {
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debug_unregister(irq_ptr->debug_area);
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return -ENOMEM;
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}
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debug_set_level(irq_ptr->debug_area, DBF_WARN);
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DBF_DEV_EVENT(DBF_ERR, irq_ptr, "dbf created");
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new_entry = kzalloc(sizeof(struct qdio_dbf_entry), GFP_KERNEL);
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if (!new_entry) {
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debug_unregister(irq_ptr->debug_area);
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return -ENOMEM;
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}
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strlcpy(new_entry->dbf_name, text, QDIO_DBF_NAME_LEN);
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new_entry->dbf_info = irq_ptr->debug_area;
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mutex_lock(&qdio_dbf_list_mutex);
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list_add(&new_entry->dbf_list, &qdio_dbf_list);
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mutex_unlock(&qdio_dbf_list_mutex);
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}
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return 0;
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}
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static int qstat_show(struct seq_file *m, void *v)
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{
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unsigned char state;
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struct qdio_q *q = m->private;
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int i;
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if (!q)
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return 0;
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seq_printf(m, "Timestamp: %Lx Last AI: %Lx\n",
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q->timestamp, last_ai_time);
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seq_printf(m, "nr_used: %d ftc: %d\n",
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atomic_read(&q->nr_buf_used), q->first_to_check);
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if (q->is_input_q) {
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seq_printf(m, "polling: %d ack start: %d ack count: %d\n",
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q->u.in.polling, q->u.in.ack_start,
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q->u.in.ack_count);
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seq_printf(m, "DSCI: %x IRQs disabled: %u\n",
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*(u8 *)q->irq_ptr->dsci,
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test_bit(QDIO_QUEUE_IRQS_DISABLED,
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&q->u.in.queue_irq_state));
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}
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seq_printf(m, "SBAL states:\n");
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seq_printf(m, "|0 |8 |16 |24 |32 |40 |48 |56 63|\n");
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for (i = 0; i < QDIO_MAX_BUFFERS_PER_Q; i++) {
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debug_get_buf_state(q, i, &state);
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switch (state) {
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case SLSB_P_INPUT_NOT_INIT:
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case SLSB_P_OUTPUT_NOT_INIT:
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seq_printf(m, "N");
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break;
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case SLSB_P_OUTPUT_PENDING:
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seq_printf(m, "P");
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break;
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case SLSB_P_INPUT_PRIMED:
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case SLSB_CU_OUTPUT_PRIMED:
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seq_printf(m, "+");
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break;
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case SLSB_P_INPUT_ACK:
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seq_printf(m, "A");
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break;
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case SLSB_P_INPUT_ERROR:
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case SLSB_P_OUTPUT_ERROR:
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seq_printf(m, "x");
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break;
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case SLSB_CU_INPUT_EMPTY:
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case SLSB_P_OUTPUT_EMPTY:
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seq_printf(m, "-");
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break;
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case SLSB_P_INPUT_HALTED:
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case SLSB_P_OUTPUT_HALTED:
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seq_printf(m, ".");
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break;
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default:
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seq_printf(m, "?");
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}
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if (i == 63)
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seq_printf(m, "\n");
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}
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seq_printf(m, "\n");
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seq_printf(m, "|64 |72 |80 |88 |96 |104 |112 | 127|\n");
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seq_printf(m, "\nSBAL statistics:");
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if (!q->irq_ptr->perf_stat_enabled) {
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seq_printf(m, " disabled\n");
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return 0;
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}
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seq_printf(m, "\n1 2.. 4.. 8.. "
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"16.. 32.. 64.. 127\n");
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for (i = 0; i < ARRAY_SIZE(q->q_stats.nr_sbals); i++)
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seq_printf(m, "%-10u ", q->q_stats.nr_sbals[i]);
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seq_printf(m, "\nError NOP Total\n%-10u %-10u %-10u\n\n",
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q->q_stats.nr_sbal_error, q->q_stats.nr_sbal_nop,
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q->q_stats.nr_sbal_total);
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return 0;
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}
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DEFINE_SHOW_ATTRIBUTE(qstat);
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static char *qperf_names[] = {
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"Assumed adapter interrupts",
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"QDIO interrupts",
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"Requested PCIs",
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"Inbound tasklet runs",
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"Inbound tasklet resched",
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"Inbound tasklet resched2",
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"Outbound tasklet runs",
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"SIGA read",
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"SIGA write",
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"SIGA sync",
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"Inbound calls",
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"Inbound handler",
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"Inbound stop_polling",
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"Inbound queue full",
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"Outbound calls",
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"Outbound handler",
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"Outbound queue full",
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"Outbound fast_requeue",
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"Outbound target_full",
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"QEBSM eqbs",
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"QEBSM eqbs partial",
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"QEBSM sqbs",
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"QEBSM sqbs partial",
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"Discarded interrupts"
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};
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static int qperf_show(struct seq_file *m, void *v)
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{
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struct qdio_irq *irq_ptr = m->private;
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unsigned int *stat;
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int i;
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if (!irq_ptr)
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return 0;
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if (!irq_ptr->perf_stat_enabled) {
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seq_printf(m, "disabled\n");
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return 0;
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}
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stat = (unsigned int *)&irq_ptr->perf_stat;
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for (i = 0; i < ARRAY_SIZE(qperf_names); i++)
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seq_printf(m, "%26s:\t%u\n",
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qperf_names[i], *(stat + i));
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return 0;
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}
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static ssize_t qperf_seq_write(struct file *file, const char __user *ubuf,
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size_t count, loff_t *off)
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{
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struct seq_file *seq = file->private_data;
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struct qdio_irq *irq_ptr = seq->private;
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struct qdio_q *q;
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unsigned long val;
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int ret, i;
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if (!irq_ptr)
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return 0;
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ret = kstrtoul_from_user(ubuf, count, 10, &val);
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if (ret)
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return ret;
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switch (val) {
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case 0:
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irq_ptr->perf_stat_enabled = 0;
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memset(&irq_ptr->perf_stat, 0, sizeof(irq_ptr->perf_stat));
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for_each_input_queue(irq_ptr, q, i)
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memset(&q->q_stats, 0, sizeof(q->q_stats));
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for_each_output_queue(irq_ptr, q, i)
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memset(&q->q_stats, 0, sizeof(q->q_stats));
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break;
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case 1:
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irq_ptr->perf_stat_enabled = 1;
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break;
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}
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return count;
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}
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static int qperf_seq_open(struct inode *inode, struct file *filp)
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{
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return single_open(filp, qperf_show,
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file_inode(filp)->i_private);
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}
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static const struct file_operations debugfs_perf_fops = {
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.owner = THIS_MODULE,
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.open = qperf_seq_open,
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.read = seq_read,
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.write = qperf_seq_write,
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.llseek = seq_lseek,
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.release = single_release,
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};
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static void setup_debugfs_entry(struct qdio_q *q)
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{
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char name[QDIO_DEBUGFS_NAME_LEN];
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snprintf(name, QDIO_DEBUGFS_NAME_LEN, "%s_%d",
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q->is_input_q ? "input" : "output",
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q->nr);
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q->debugfs_q = debugfs_create_file(name, 0444,
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q->irq_ptr->debugfs_dev, q, &qstat_fops);
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if (IS_ERR(q->debugfs_q))
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q->debugfs_q = NULL;
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}
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void qdio_setup_debug_entries(struct qdio_irq *irq_ptr, struct ccw_device *cdev)
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{
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struct qdio_q *q;
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int i;
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irq_ptr->debugfs_dev = debugfs_create_dir(dev_name(&cdev->dev),
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debugfs_root);
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if (IS_ERR(irq_ptr->debugfs_dev))
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irq_ptr->debugfs_dev = NULL;
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irq_ptr->debugfs_perf = debugfs_create_file("statistics",
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S_IFREG | S_IRUGO | S_IWUSR,
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irq_ptr->debugfs_dev, irq_ptr,
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&debugfs_perf_fops);
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if (IS_ERR(irq_ptr->debugfs_perf))
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irq_ptr->debugfs_perf = NULL;
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for_each_input_queue(irq_ptr, q, i)
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setup_debugfs_entry(q);
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for_each_output_queue(irq_ptr, q, i)
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setup_debugfs_entry(q);
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}
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void qdio_shutdown_debug_entries(struct qdio_irq *irq_ptr)
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{
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struct qdio_q *q;
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int i;
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for_each_input_queue(irq_ptr, q, i)
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debugfs_remove(q->debugfs_q);
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for_each_output_queue(irq_ptr, q, i)
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debugfs_remove(q->debugfs_q);
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debugfs_remove(irq_ptr->debugfs_perf);
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debugfs_remove(irq_ptr->debugfs_dev);
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}
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int __init qdio_debug_init(void)
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{
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debugfs_root = debugfs_create_dir("qdio", NULL);
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qdio_dbf_setup = debug_register("qdio_setup", 16, 1, 16);
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debug_register_view(qdio_dbf_setup, &debug_hex_ascii_view);
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debug_set_level(qdio_dbf_setup, DBF_INFO);
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DBF_EVENT("dbf created\n");
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qdio_dbf_error = debug_register("qdio_error", 4, 1, 16);
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debug_register_view(qdio_dbf_error, &debug_hex_ascii_view);
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debug_set_level(qdio_dbf_error, DBF_INFO);
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DBF_ERROR("dbf created\n");
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return 0;
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}
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void qdio_debug_exit(void)
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{
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qdio_clear_dbf_list();
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debugfs_remove(debugfs_root);
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debug_unregister(qdio_dbf_setup);
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debug_unregister(qdio_dbf_error);
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}
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