// SPDX-License-Identifier: GPL-2.0 /* * Copyright IBM Corp. 2012,2015 * * Author(s): * Jan Glauber <jang@linux.vnet.ibm.com> */ #define KMSG_COMPONENT "zpci" #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt #include <linux/kernel.h> #include <linux/seq_file.h> #include <linux/debugfs.h> #include <linux/export.h> #include <linux/pci.h> #include <asm/debug.h> #include <asm/pci_dma.h> static struct dentry *debugfs_root; debug_info_t *pci_debug_msg_id; EXPORT_SYMBOL_GPL(pci_debug_msg_id); debug_info_t *pci_debug_err_id; EXPORT_SYMBOL_GPL(pci_debug_err_id); static char *pci_common_names[] = { "Load operations", "Store operations", "Store block operations", "Refresh operations", }; static char *pci_fmt0_names[] = { "DMA read bytes", "DMA write bytes", }; static char *pci_fmt1_names[] = { "Received bytes", "Received packets", "Transmitted bytes", "Transmitted packets", }; static char *pci_fmt2_names[] = { "Consumed work units", "Maximum work units", }; static char *pci_fmt3_names[] = { "Transmitted bytes", }; static char *pci_sw_names[] = { "Allocated pages", "Mapped pages", "Unmapped pages", }; static void pci_fmb_show(struct seq_file *m, char *name[], int length, u64 *data) { int i; for (i = 0; i < length; i++, data++) seq_printf(m, "%26s:\t%llu\n", name[i], *data); } static void pci_sw_counter_show(struct seq_file *m) { struct zpci_dev *zdev = m->private; atomic64_t *counter = &zdev->allocated_pages; int i; for (i = 0; i < ARRAY_SIZE(pci_sw_names); i++, counter++) seq_printf(m, "%26s:\t%llu\n", pci_sw_names[i], atomic64_read(counter)); } static int pci_perf_show(struct seq_file *m, void *v) { struct zpci_dev *zdev = m->private; if (!zdev) return 0; mutex_lock(&zdev->lock); if (!zdev->fmb) { mutex_unlock(&zdev->lock); seq_puts(m, "FMB statistics disabled\n"); return 0; } /* header */ seq_printf(m, "Update interval: %u ms\n", zdev->fmb_update); seq_printf(m, "Samples: %u\n", zdev->fmb->samples); seq_printf(m, "Last update TOD: %Lx\n", zdev->fmb->last_update); pci_fmb_show(m, pci_common_names, ARRAY_SIZE(pci_common_names), &zdev->fmb->ld_ops); switch (zdev->fmb->format) { case 0: if (!(zdev->fmb->fmt_ind & ZPCI_FMB_DMA_COUNTER_VALID)) break; pci_fmb_show(m, pci_fmt0_names, ARRAY_SIZE(pci_fmt0_names), &zdev->fmb->fmt0.dma_rbytes); break; case 1: pci_fmb_show(m, pci_fmt1_names, ARRAY_SIZE(pci_fmt1_names), &zdev->fmb->fmt1.rx_bytes); break; case 2: pci_fmb_show(m, pci_fmt2_names, ARRAY_SIZE(pci_fmt2_names), &zdev->fmb->fmt2.consumed_work_units); break; case 3: pci_fmb_show(m, pci_fmt3_names, ARRAY_SIZE(pci_fmt3_names), &zdev->fmb->fmt3.tx_bytes); break; default: seq_puts(m, "Unknown format\n"); } pci_sw_counter_show(m); mutex_unlock(&zdev->lock); return 0; } static ssize_t pci_perf_seq_write(struct file *file, const char __user *ubuf, size_t count, loff_t *off) { struct zpci_dev *zdev = ((struct seq_file *) file->private_data)->private; unsigned long val; int rc; if (!zdev) return 0; rc = kstrtoul_from_user(ubuf, count, 10, &val); if (rc) return rc; mutex_lock(&zdev->lock); switch (val) { case 0: rc = zpci_fmb_disable_device(zdev); break; case 1: rc = zpci_fmb_enable_device(zdev); break; } mutex_unlock(&zdev->lock); return rc ? rc : count; } static int pci_perf_seq_open(struct inode *inode, struct file *filp) { return single_open(filp, pci_perf_show, file_inode(filp)->i_private); } static const struct file_operations debugfs_pci_perf_fops = { .open = pci_perf_seq_open, .read = seq_read, .write = pci_perf_seq_write, .llseek = seq_lseek, .release = single_release, }; void zpci_debug_init_device(struct zpci_dev *zdev, const char *name) { zdev->debugfs_dev = debugfs_create_dir(name, debugfs_root); debugfs_create_file("statistics", S_IFREG | S_IRUGO | S_IWUSR, zdev->debugfs_dev, zdev, &debugfs_pci_perf_fops); } void zpci_debug_exit_device(struct zpci_dev *zdev) { debugfs_remove_recursive(zdev->debugfs_dev); } int __init zpci_debug_init(void) { /* event trace buffer */ pci_debug_msg_id = debug_register("pci_msg", 8, 1, 8 * sizeof(long)); if (!pci_debug_msg_id) return -EINVAL; debug_register_view(pci_debug_msg_id, &debug_sprintf_view); debug_set_level(pci_debug_msg_id, 3); /* error log */ pci_debug_err_id = debug_register("pci_error", 2, 1, 16); if (!pci_debug_err_id) return -EINVAL; debug_register_view(pci_debug_err_id, &debug_hex_ascii_view); debug_set_level(pci_debug_err_id, 6); debugfs_root = debugfs_create_dir("pci", NULL); return 0; } void zpci_debug_exit(void) { debug_unregister(pci_debug_msg_id); debug_unregister(pci_debug_err_id); debugfs_remove(debugfs_root); }