// SPDX-License-Identifier: MIT
/*
 * Copyright © 2020 Intel Corporation
 */

#include <linux/fs.h>
#include <drm/drm_print.h>

#include "gt/intel_gt_debugfs.h"
#include "intel_guc.h"
#include "intel_guc_log.h"
#include "intel_guc_log_debugfs.h"
#include "intel_uc.h"

static u32 obj_to_guc_log_dump_size(struct drm_i915_gem_object *obj)
{
        u32 size;

        if (!obj)
                return PAGE_SIZE;

        /* "0x%08x 0x%08x 0x%08x 0x%08x\n" => 16 bytes -> 44 chars => x2.75 */
        size = ((obj->base.size * 11) + 3) / 4;

        /* Add padding for final blank line, any extra header info, etc. */
        size = PAGE_ALIGN(size + PAGE_SIZE);

        return size;
}

static u32 guc_log_dump_size(struct intel_guc_log *log)
{
        struct intel_guc *guc = log_to_guc(log);

        if (!intel_guc_is_supported(guc))
                return PAGE_SIZE;

        if (!log->vma)
                return PAGE_SIZE;

        return obj_to_guc_log_dump_size(log->vma->obj);
}

static int guc_log_dump_show(struct seq_file *m, void *data)
{
        struct drm_printer p = drm_seq_file_printer(m);
        int ret;

        ret = intel_guc_log_dump(m->private, &p, false);

        if (IS_ENABLED(CONFIG_DRM_I915_DEBUG_GEM) && seq_has_overflowed(m))
                pr_warn_once("preallocated size:%zx for %s exceeded\n",
                             m->size, __func__);

        return ret;
}
DEFINE_INTEL_GT_DEBUGFS_ATTRIBUTE_WITH_SIZE(guc_log_dump, guc_log_dump_size);

static u32 guc_load_err_dump_size(struct intel_guc_log *log)
{
        struct intel_guc *guc = log_to_guc(log);
        struct intel_uc *uc = container_of(guc, struct intel_uc, guc);

        if (!intel_guc_is_supported(guc))
                return PAGE_SIZE;

        return obj_to_guc_log_dump_size(uc->load_err_log);
}

static int guc_load_err_log_dump_show(struct seq_file *m, void *data)
{
        struct drm_printer p = drm_seq_file_printer(m);

        if (IS_ENABLED(CONFIG_DRM_I915_DEBUG_GEM) && seq_has_overflowed(m))
                pr_warn_once("preallocated size:%zx for %s exceeded\n",
                             m->size, __func__);

        return intel_guc_log_dump(m->private, &p, true);
}
DEFINE_INTEL_GT_DEBUGFS_ATTRIBUTE_WITH_SIZE(guc_load_err_log_dump, guc_load_err_dump_size);

static int guc_log_level_get(void *data, u64 *val)
{
        struct intel_guc_log *log = data;

        if (!log->vma)
                return -ENODEV;

        *val = intel_guc_log_get_level(log);

        return 0;
}

static int guc_log_level_set(void *data, u64 val)
{
        struct intel_guc_log *log = data;

        if (!log->vma)
                return -ENODEV;

        return intel_guc_log_set_level(log, val);
}

DEFINE_SIMPLE_ATTRIBUTE(guc_log_level_fops,
                        guc_log_level_get, guc_log_level_set,
                        "%lld\n");

static int guc_log_relay_open(struct inode *inode, struct file *file)
{
        struct intel_guc_log *log = inode->i_private;

        if (!intel_guc_is_ready(log_to_guc(log)))
                return -ENODEV;

        file->private_data = log;

        return intel_guc_log_relay_open(log);
}

static ssize_t
guc_log_relay_write(struct file *filp,
                    const char __user *ubuf,
                    size_t cnt,
                    loff_t *ppos)
{
        struct intel_guc_log *log = filp->private_data;
        int val;
        int ret;

        ret = kstrtoint_from_user(ubuf, cnt, 0, &val);
        if (ret < 0)
                return ret;

        /*
         * Enable and start the guc log relay on value of 1.
         * Flush log relay for any other value.
         */
        if (val == 1)
                ret = intel_guc_log_relay_start(log);
        else
                intel_guc_log_relay_flush(log);

        return ret ?: cnt;
}

static int guc_log_relay_release(struct inode *inode, struct file *file)
{
        struct intel_guc_log *log = inode->i_private;

        intel_guc_log_relay_close(log);
        return 0;
}

static const struct file_operations guc_log_relay_fops = {
        .owner = THIS_MODULE,
        .open = guc_log_relay_open,
        .write = guc_log_relay_write,
        .release = guc_log_relay_release,
};

void intel_guc_log_debugfs_register(struct intel_guc_log *log,
                                    struct dentry *root)
{
        static const struct intel_gt_debugfs_file files[] = {
                { .name = "guc_log_dump", .fops = &guc_log_dump_fops },
                { .name = "guc_load_err_log_dump", .fops = &guc_load_err_log_dump_fops},
                { .name = "guc_log_level", .fops = &guc_log_level_fops },
                { .name = "guc_log_relay", .fops = &guc_log_relay_fops },
        };

        if (!intel_guc_is_supported(log_to_guc(log)))
                return;

        intel_gt_debugfs_register_files(root, files, ARRAY_SIZE(files), log);
}