arch/powerpc/platforms/powernv/vas-debug.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Copyright 2016-17 IBM Corp.
   4  */
   5
   6 #define pr_fmt(fmt) "vas: " fmt
   7
   8 #include <linux/types.h>
   9 #include <linux/slab.h>
  10 #include <linux/debugfs.h>
  11 #include <linux/seq_file.h>
  12 #include "vas.h"
  13
  14 static struct dentry *vas_debugfs;
  15
  16 static char *cop_to_str(int cop)
  17 {
  18         switch (cop) {
  19         case VAS_COP_TYPE_FAULT:        return "Fault";
  20         case VAS_COP_TYPE_842:          return "NX-842 Normal Priority";
  21         case VAS_COP_TYPE_842_HIPRI:    return "NX-842 High Priority";
  22         case VAS_COP_TYPE_GZIP:         return "NX-GZIP Normal Priority";
  23         case VAS_COP_TYPE_GZIP_HIPRI:   return "NX-GZIP High Priority";
  24         case VAS_COP_TYPE_FTW:          return "Fast Thread-wakeup";
  25         default:                        return "Unknown";
  26         }
  27 }
  28
  29 static int info_show(struct seq_file *s, void *private)
  30 {
  31         struct vas_window *window = s->private;
  32
  33         mutex_lock(&vas_mutex);
  34
  35         /* ensure window is not unmapped */
  36         if (!window->hvwc_map)
  37                 goto unlock;
  38
  39         seq_printf(s, "Type: %s, %s\n", cop_to_str(window->cop),
  40                                         window->tx_win ? "Send" : "Receive");
  41         seq_printf(s, "Pid : %d\n", vas_window_pid(window));
  42
  43 unlock:
  44         mutex_unlock(&vas_mutex);
  45         return 0;
  46 }
  47
  48 DEFINE_SHOW_ATTRIBUTE(info);
  49
  50 static inline void print_reg(struct seq_file *s, struct vas_window *win,
  51                         char *name, u32 reg)
  52 {
  53         seq_printf(s, "0x%016llx %s\n", read_hvwc_reg(win, name, reg), name);
  54 }
  55
  56 static int hvwc_show(struct seq_file *s, void *private)
  57 {
  58         struct vas_window *window = s->private;
  59
  60         mutex_lock(&vas_mutex);
  61
  62         /* ensure window is not unmapped */
  63         if (!window->hvwc_map)
  64                 goto unlock;
  65
  66         print_reg(s, window, VREG(LPID));
  67         print_reg(s, window, VREG(PID));
  68         print_reg(s, window, VREG(XLATE_MSR));
  69         print_reg(s, window, VREG(XLATE_LPCR));
  70         print_reg(s, window, VREG(XLATE_CTL));
  71         print_reg(s, window, VREG(AMR));
  72         print_reg(s, window, VREG(SEIDR));
  73         print_reg(s, window, VREG(FAULT_TX_WIN));
  74         print_reg(s, window, VREG(OSU_INTR_SRC_RA));
  75         print_reg(s, window, VREG(HV_INTR_SRC_RA));
  76         print_reg(s, window, VREG(PSWID));
  77         print_reg(s, window, VREG(LFIFO_BAR));
  78         print_reg(s, window, VREG(LDATA_STAMP_CTL));
  79         print_reg(s, window, VREG(LDMA_CACHE_CTL));
  80         print_reg(s, window, VREG(LRFIFO_PUSH));
  81         print_reg(s, window, VREG(CURR_MSG_COUNT));
  82         print_reg(s, window, VREG(LNOTIFY_AFTER_COUNT));
  83         print_reg(s, window, VREG(LRX_WCRED));
  84         print_reg(s, window, VREG(LRX_WCRED_ADDER));
  85         print_reg(s, window, VREG(TX_WCRED));
  86         print_reg(s, window, VREG(TX_WCRED_ADDER));
  87         print_reg(s, window, VREG(LFIFO_SIZE));
  88         print_reg(s, window, VREG(WINCTL));
  89         print_reg(s, window, VREG(WIN_STATUS));
  90         print_reg(s, window, VREG(WIN_CTX_CACHING_CTL));
  91         print_reg(s, window, VREG(TX_RSVD_BUF_COUNT));
  92         print_reg(s, window, VREG(LRFIFO_WIN_PTR));
  93         print_reg(s, window, VREG(LNOTIFY_CTL));
  94         print_reg(s, window, VREG(LNOTIFY_PID));
  95         print_reg(s, window, VREG(LNOTIFY_LPID));
  96         print_reg(s, window, VREG(LNOTIFY_TID));
  97         print_reg(s, window, VREG(LNOTIFY_SCOPE));
  98         print_reg(s, window, VREG(NX_UTIL_ADDER));
  99 unlock:
 100         mutex_unlock(&vas_mutex);
 101         return 0;
 102 }
 103
 104 DEFINE_SHOW_ATTRIBUTE(hvwc);
 105
 106 void vas_window_free_dbgdir(struct vas_window *window)
 107 {
 108         if (window->dbgdir) {
 109                 debugfs_remove_recursive(window->dbgdir);
 110                 kfree(window->dbgname);
 111                 window->dbgdir = NULL;
 112                 window->dbgname = NULL;
 113         }
 114 }
 115
 116 void vas_window_init_dbgdir(struct vas_window *window)
 117 {
 118         struct dentry *d;
 119
 120         if (!window->vinst->dbgdir)
 121                 return;
 122
 123         window->dbgname = kzalloc(16, GFP_KERNEL);
 124         if (!window->dbgname)
 125                 return;
 126
 127         snprintf(window->dbgname, 16, "w%d", window->winid);
 128
 129         d = debugfs_create_dir(window->dbgname, window->vinst->dbgdir);
 130         window->dbgdir = d;
 131
 132         debugfs_create_file("info", 0444, d, window, &info_fops);
 133         debugfs_create_file("hvwc", 0444, d, window, &hvwc_fops);
 134 }
 135
 136 void vas_instance_init_dbgdir(struct vas_instance *vinst)
 137 {
 138         struct dentry *d;
 139
 140         vas_init_dbgdir();
 141
 142         vinst->dbgname = kzalloc(16, GFP_KERNEL);
 143         if (!vinst->dbgname)
 144                 return;
 145
 146         snprintf(vinst->dbgname, 16, "v%d", vinst->vas_id);
 147
 148         d = debugfs_create_dir(vinst->dbgname, vas_debugfs);
 149         vinst->dbgdir = d;
 150 }
 151
 152 /*
 153  * Set up the "root" VAS debugfs dir. Return if we already set it up
 154  * (or failed to) in an earlier instance of VAS.
 155  */
 156 void vas_init_dbgdir(void)
 157 {
 158         static bool first_time = true;
 159
 160         if (!first_time)
 161                 return;
 162
 163         first_time = false;
 164         vas_debugfs = debugfs_create_dir("vas", NULL);
 165 }