/* Copyright (c) 2002,2008-2016, The Linux Foundation. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 and
 * only version 2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 */

#include <linux/module.h>
#include <linux/debugfs.h>

#include "kgsl.h"
#include "kgsl_device.h"
#include "kgsl_sharedmem.h"
#include "kgsl_debugfs.h"

/*default log levels is error for everything*/
#define KGSL_LOG_LEVEL_MAX     7

struct dentry *kgsl_debugfs_dir;
static struct dentry *proc_d_debugfs;

static inline int kgsl_log_set(unsigned int *log_val, void *data, u64 val)
{
	*log_val = min((unsigned int)val, (unsigned int)KGSL_LOG_LEVEL_MAX);
	return 0;
}

#define KGSL_DEBUGFS_LOG(__log)                         \
static int __log ## _set(void *data, u64 val)           \
{                                                       \
	struct kgsl_device *device = data;              \
	return kgsl_log_set(&device->__log, data, val); \
}                                                       \
static int __log ## _get(void *data, u64 *val)	        \
{                                                       \
	struct kgsl_device *device = data;              \
	*val = device->__log;                           \
	return 0;                                       \
}                                                       \
DEFINE_SIMPLE_ATTRIBUTE(__log ## _fops,                 \
__log ## _get, __log ## _set, "%llu\n");                \

KGSL_DEBUGFS_LOG(drv_log);
KGSL_DEBUGFS_LOG(cmd_log);
KGSL_DEBUGFS_LOG(ctxt_log);
KGSL_DEBUGFS_LOG(mem_log);
KGSL_DEBUGFS_LOG(pwr_log);

static int _strict_set(void *data, u64 val)
{
	kgsl_sharedmem_set_noretry(val ? true : false);
	return 0;
}

static int _strict_get(void *data, u64 *val)
{
	*val = kgsl_sharedmem_get_noretry();
	return 0;
}

DEFINE_SIMPLE_ATTRIBUTE(_strict_fops, _strict_get, _strict_set, "%llu\n");

void kgsl_device_debugfs_init(struct kgsl_device *device)
{
	if (kgsl_debugfs_dir && !IS_ERR(kgsl_debugfs_dir))
		device->d_debugfs = debugfs_create_dir(device->name,
						       kgsl_debugfs_dir);

	if (!device->d_debugfs || IS_ERR(device->d_debugfs))
		return;

	debugfs_create_file("log_level_cmd", 0644, device->d_debugfs, device,
			    &cmd_log_fops);
	debugfs_create_file("log_level_ctxt", 0644, device->d_debugfs, device,
			    &ctxt_log_fops);
	debugfs_create_file("log_level_drv", 0644, device->d_debugfs, device,
			    &drv_log_fops);
	debugfs_create_file("log_level_mem", 0644, device->d_debugfs, device,
				&mem_log_fops);
	debugfs_create_file("log_level_pwr", 0644, device->d_debugfs, device,
				&pwr_log_fops);
}

struct type_entry {
	int type;
	const char *str;
};

static const struct type_entry memtypes[] = { KGSL_MEM_TYPES };

static const char *memtype_str(int memtype)
{
	int i;
	for (i = 0; i < ARRAY_SIZE(memtypes); i++)
		if (memtypes[i].type == memtype)
			return memtypes[i].str;
	return "unknown";
}

static char get_alignflag(const struct kgsl_memdesc *m)
{
	int align = kgsl_memdesc_get_align(m);
	if (align >= ilog2(SZ_1M))
		return 'L';
	else if (align >= ilog2(SZ_64K))
		return 'l';
	return '-';
}

static char get_cacheflag(const struct kgsl_memdesc *m)
{
	static const char table[] = {
		[KGSL_CACHEMODE_WRITECOMBINE] = '-',
		[KGSL_CACHEMODE_UNCACHED] = 'u',
		[KGSL_CACHEMODE_WRITEBACK] = 'b',
		[KGSL_CACHEMODE_WRITETHROUGH] = 't',
	};
	return table[kgsl_memdesc_get_cachemode(m)];
}


static int print_mem_entry(void *data, void *ptr)
{
	struct seq_file *s = data;
	struct kgsl_mem_entry *entry = ptr;
	char flags[9];
	char usage[16];
	struct kgsl_memdesc *m = &entry->memdesc;
	unsigned int usermem_type = kgsl_memdesc_usermem_type(m);
	int egl_surface_count = 0, egl_image_count = 0;

	flags[0] = kgsl_memdesc_is_global(m) ?  'g' : '-';
	flags[1] = '-';
	flags[2] = !(m->flags & KGSL_MEMFLAGS_GPUREADONLY) ? 'w' : '-';
	flags[3] = get_alignflag(m);
	flags[4] = get_cacheflag(m);
	flags[5] = kgsl_memdesc_use_cpu_map(m) ? 'p' : '-';
	flags[6] = (m->useraddr) ? 'Y' : 'N';
	flags[7] = kgsl_memdesc_is_secured(m) ?  's' : '-';
	flags[8] = '\0';

	kgsl_get_memory_usage(usage, sizeof(usage), m->flags);

	if (usermem_type == KGSL_MEM_ENTRY_ION)
		kgsl_get_egl_counts(entry, &egl_surface_count,
						&egl_image_count);

	seq_printf(s, "%pK %pK %16llu %5d %9s %10s %16s %5d %16llu %6d %6d",
			(uint64_t *)(uintptr_t) m->gpuaddr,
			(unsigned long *) m->useraddr,
			m->size, entry->id, flags,
			memtype_str(usermem_type),
			usage, (m->sgt ? m->sgt->nents : 0), m->mapsize,
			egl_surface_count, egl_image_count);

	if (entry->metadata[0] != 0)
		seq_printf(s, " %s", entry->metadata);

	seq_putc(s, '\n');

	return 0;
}

static struct kgsl_mem_entry *process_mem_seq_find(struct seq_file *s,
						void *ptr, loff_t pos)
{
	struct kgsl_mem_entry *entry = ptr;
	struct kgsl_process_private *private = s->private;
	int id = 0;
	loff_t temp_pos = 1;

	if (entry != SEQ_START_TOKEN)
		id = entry->id + 1;

	spin_lock(&private->mem_lock);
	for (entry = idr_get_next(&private->mem_idr, &id); entry;
		id++, entry = idr_get_next(&private->mem_idr, &id),
							temp_pos++) {
		if (temp_pos == pos && kgsl_mem_entry_get(entry)) {
			spin_unlock(&private->mem_lock);
			goto found;
		}
	}
	spin_unlock(&private->mem_lock);

	entry = NULL;
found:
	if (ptr != SEQ_START_TOKEN)
		kgsl_mem_entry_put(ptr);

	return entry;
}

static void *process_mem_seq_start(struct seq_file *s, loff_t *pos)
{
	loff_t seq_file_offset = *pos;

	if (seq_file_offset == 0)
		return SEQ_START_TOKEN;
	else
		return process_mem_seq_find(s, SEQ_START_TOKEN,
						seq_file_offset);
}

static void process_mem_seq_stop(struct seq_file *s, void *ptr)
{
	if (ptr && ptr != SEQ_START_TOKEN)
		kgsl_mem_entry_put(ptr);
}

static void *process_mem_seq_next(struct seq_file *s, void *ptr,
							loff_t *pos)
{
	++*pos;
	return process_mem_seq_find(s, ptr, 1);
}

static int process_mem_seq_show(struct seq_file *s, void *ptr)
{
	if (ptr == SEQ_START_TOKEN) {
		seq_printf(s, "%16s %16s %16s %5s %9s %10s %16s %5s %16s %6s %6s\n",
			"gpuaddr", "useraddr", "size", "id", "flags", "type",
			"usage", "sglen", "mapsize", "eglsrf", "eglimg");
		return 0;
	} else
		return print_mem_entry(s, ptr);
}

static const struct seq_operations process_mem_seq_fops = {
	.start = process_mem_seq_start,
	.stop = process_mem_seq_stop,
	.next = process_mem_seq_next,
	.show = process_mem_seq_show,
};

static int process_mem_open(struct inode *inode, struct file *file)
{
	int ret;
	pid_t pid = (pid_t) (unsigned long) inode->i_private;
	struct seq_file *s = NULL;
	struct kgsl_process_private *private = NULL;

	private = kgsl_process_private_find(pid);

	if (!private)
		return -ENODEV;

	ret = seq_open(file, &process_mem_seq_fops);
	if (ret)
		kgsl_process_private_put(private);
	else {
		s = file->private_data;
		s->private = private;
	}

	return ret;
}

static int process_mem_release(struct inode *inode, struct file *file)
{
	struct kgsl_process_private *private =
		((struct seq_file *)file->private_data)->private;

	if (private)
		kgsl_process_private_put(private);

	return seq_release(inode, file);
}

static const struct file_operations process_mem_fops = {
	.open = process_mem_open,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = process_mem_release,
};


static int globals_print(struct seq_file *s, void *unused)
{
	kgsl_print_global_pt_entries(s);
	return 0;
}

static int globals_open(struct inode *inode, struct file *file)
{
	return single_open(file, globals_print, NULL);
}

static int globals_release(struct inode *inode, struct file *file)
{
	return single_release(inode, file);
}

static const struct file_operations global_fops = {
	.open = globals_open,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = globals_release,
};

/**
 * kgsl_process_init_debugfs() - Initialize debugfs for a process
 * @private: Pointer to process private structure created for the process
 *
 * kgsl_process_init_debugfs() is called at the time of creating the
 * process struct when a process opens kgsl device for the first time.
 * This function is not fatal - all we do is print a warning message if
 * the files can't be created
 */
void kgsl_process_init_debugfs(struct kgsl_process_private *private)
{
	unsigned char name[16];
	struct dentry *dentry;

	snprintf(name, sizeof(name), "%d", private->pid);

	private->debug_root = debugfs_create_dir(name, proc_d_debugfs);

	/*
	 * Both debugfs_create_dir() and debugfs_create_file() return
	 * ERR_PTR(-ENODEV) if debugfs is disabled in the kernel but return
	 * NULL on error when it is enabled. For both usages we need to check
	 * for ERROR or NULL and only print a warning on an actual failure
	 * (i.e. - when the return value is NULL)
	 */

	if (IS_ERR_OR_NULL(private->debug_root)) {
		WARN((private->debug_root == NULL),
			"Unable to create debugfs dir for %s\n", name);
		private->debug_root = NULL;
		return;
	}

	dentry = debugfs_create_file("mem", 0444, private->debug_root,
		(void *) ((unsigned long) private->pid), &process_mem_fops);

	if (IS_ERR_OR_NULL(dentry))
		WARN((dentry == NULL),
			"Unable to create 'mem' file for %s\n", name);
}

void kgsl_core_debugfs_init(void)
{
	struct dentry *debug_dir;

	kgsl_debugfs_dir = debugfs_create_dir("kgsl", NULL);

	debugfs_create_file("globals", 0444, kgsl_debugfs_dir, NULL,
		&global_fops);

	debug_dir = debugfs_create_dir("debug", kgsl_debugfs_dir);

	debugfs_create_file("strict_memory", 0644, debug_dir, NULL,
		&_strict_fops);

	proc_d_debugfs = debugfs_create_dir("proc", kgsl_debugfs_dir);
}

void kgsl_core_debugfs_close(void)
{
	debugfs_remove_recursive(kgsl_debugfs_dir);
}