drivers/gpu/arm/midgard/mali_kbase_regs_history_debugfs.c

   1 /*
   2  *
   3  * (C) COPYRIGHT 2016 ARM Limited. All rights reserved.
   4  *
   5  * This program is free software and is provided to you under the terms of the
   6  * GNU General Public License version 2 as published by the Free Software
   7  * Foundation, and any use by you of this program is subject to the terms
   8  * of such GNU licence.
   9  *
  10  * A copy of the licence is included with the program, and can also be obtained
  11  * from Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  12  * Boston, MA  02110-1301, USA.
  13  *
  14  */
  15
  16
  17
  18 #include "mali_kbase.h"
  19
  20 #include "mali_kbase_regs_history_debugfs.h"
  21
  22 #if defined(CONFIG_DEBUG_FS) && !defined(CONFIG_MALI_NO_MALI)
  23
  24 #include <linux/debugfs.h>
  25
  26
  27 static int regs_history_size_get(void *data, u64 *val)
  28 {
  29         struct kbase_io_history *const h = data;
  30
  31         *val = h->size;
  32
  33         return 0;
  34 }
  35
  36 static int regs_history_size_set(void *data, u64 val)
  37 {
  38         struct kbase_io_history *const h = data;
  39
  40         return kbase_io_history_resize(h, (u16)val);
  41 }
  42
  43
  44 DEFINE_SIMPLE_ATTRIBUTE(regs_history_size_fops,
  45                 regs_history_size_get,
  46                 regs_history_size_set,
  47                 "%llu\n");
  48
  49
  50 /**
  51  * regs_history_show - show callback for the register access history file.
  52  *
  53  * @sfile: The debugfs entry
  54  * @data: Data associated with the entry
  55  *
  56  * This function is called to dump all recent accesses to the GPU registers.
  57  *
  58  * @return 0 if successfully prints data in debugfs entry file, failure
  59  * otherwise
  60  */
  61 static int regs_history_show(struct seq_file *sfile, void *data)
  62 {
  63         struct kbase_io_history *const h = sfile->private;
  64         u16 i;
  65         size_t iters;
  66         unsigned long flags;
  67
  68         if (!h->enabled) {
  69                 seq_puts(sfile, "The register access history is disabled\n");
  70                 goto out;
  71         }
  72
  73         spin_lock_irqsave(&h->lock, flags);
  74
  75         iters = (h->size > h->count) ? h->count : h->size;
  76         seq_printf(sfile, "Last %zu register accesses of %zu total:\n", iters,
  77                         h->count);
  78         for (i = 0; i < iters; ++i) {
  79                 struct kbase_io_access *io =
  80                         &h->buf[(h->count - iters + i) % h->size];
  81                 char const access = (io->addr & 1) ? 'w' : 'r';
  82
  83                 seq_printf(sfile, "%6i: %c: reg 0x%p val %08x\n", i, access,
  84                                 (void *)(io->addr & ~0x1), io->value);
  85         }
  86
  87         spin_unlock_irqrestore(&h->lock, flags);
  88
  89 out:
  90         return 0;
  91 }
  92
  93
  94 /**
  95  * regs_history_open - open operation for regs_history debugfs file
  96  *
  97  * @in: &struct inode pointer
  98  * @file: &struct file pointer
  99  *
 100  * @return file descriptor
 101  */
 102 static int regs_history_open(struct inode *in, struct file *file)
 103 {
 104         return single_open(file, &regs_history_show, in->i_private);
 105 }
 106
 107
 108 static const struct file_operations regs_history_fops = {
 109         .open = &regs_history_open,
 110         .read = seq_read,
 111         .llseek = seq_lseek,
 112         .release = single_release,
 113 };
 114
 115
 116 void kbasep_regs_history_debugfs_init(struct kbase_device *kbdev)
 117 {
 118         debugfs_create_bool("regs_history_enabled", S_IRUGO | S_IWUSR,
 119                         kbdev->mali_debugfs_directory,
 120                         &kbdev->io_history.enabled);
 121         debugfs_create_file("regs_history_size", S_IRUGO | S_IWUSR,
 122                         kbdev->mali_debugfs_directory,
 123                         &kbdev->io_history, &regs_history_size_fops);
 124         debugfs_create_file("regs_history", S_IRUGO,
 125                         kbdev->mali_debugfs_directory, &kbdev->io_history,
 126                         &regs_history_fops);
 127 }
 128
 129
 130 #endif /* CONFIG_DEBUG_FS */