/*
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*
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* (C) COPYRIGHT 2016 ARM Limited. All rights reserved.
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*
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* This program is free software and is provided to you under the terms of the
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* GNU General Public License version 2 as published by the Free Software
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* Foundation, and any use by you of this program is subject to the terms
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* of such GNU licence.
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*
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* A copy of the licence is included with the program, and can also be obtained
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* from Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*
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*/
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#include "mali_kbase.h"
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#include "mali_kbase_regs_history_debugfs.h"
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#if defined(CONFIG_DEBUG_FS) && !defined(CONFIG_MALI_NO_MALI)
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#include <linux/debugfs.h>
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static int regs_history_size_get(void *data, u64 *val)
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{
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struct kbase_io_history *const h = data;
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*val = h->size;
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return 0;
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}
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static int regs_history_size_set(void *data, u64 val)
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{
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struct kbase_io_history *const h = data;
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return kbase_io_history_resize(h, (u16)val);
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}
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DEFINE_SIMPLE_ATTRIBUTE(regs_history_size_fops,
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regs_history_size_get,
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regs_history_size_set,
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"%llu\n");
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/**
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* regs_history_show - show callback for the register access history file.
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*
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* @sfile: The debugfs entry
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* @data: Data associated with the entry
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*
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* This function is called to dump all recent accesses to the GPU registers.
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*
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* @return 0 if successfully prints data in debugfs entry file, failure
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* otherwise
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*/
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static int regs_history_show(struct seq_file *sfile, void *data)
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{
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struct kbase_io_history *const h = sfile->private;
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u16 i;
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size_t iters;
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unsigned long flags;
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if (!h->enabled) {
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seq_puts(sfile, "The register access history is disabled\n");
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goto out;
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}
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spin_lock_irqsave(&h->lock, flags);
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iters = (h->size > h->count) ? h->count : h->size;
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seq_printf(sfile, "Last %zu register accesses of %zu total:\n", iters,
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h->count);
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for (i = 0; i < iters; ++i) {
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struct kbase_io_access *io =
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&h->buf[(h->count - iters + i) % h->size];
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char const access = (io->addr & 1) ? 'w' : 'r';
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seq_printf(sfile, "%6i: %c: reg 0x%p val %08x\n", i, access,
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(void *)(io->addr & ~0x1), io->value);
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}
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spin_unlock_irqrestore(&h->lock, flags);
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out:
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return 0;
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}
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/**
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* regs_history_open - open operation for regs_history debugfs file
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*
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* @in: &struct inode pointer
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* @file: &struct file pointer
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*
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* @return file descriptor
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*/
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static int regs_history_open(struct inode *in, struct file *file)
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{
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return single_open(file, ®s_history_show, in->i_private);
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}
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static const struct file_operations regs_history_fops = {
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.open = ®s_history_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = single_release,
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};
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void kbasep_regs_history_debugfs_init(struct kbase_device *kbdev)
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{
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debugfs_create_bool("regs_history_enabled", S_IRUGO | S_IWUSR,
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kbdev->mali_debugfs_directory,
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&kbdev->io_history.enabled);
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debugfs_create_file("regs_history_size", S_IRUGO | S_IWUSR,
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kbdev->mali_debugfs_directory,
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&kbdev->io_history, ®s_history_size_fops);
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debugfs_create_file("regs_history", S_IRUGO,
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kbdev->mali_debugfs_directory, &kbdev->io_history,
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®s_history_fops);
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}
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#endif /* CONFIG_DEBUG_FS */
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