// SPDX-License-Identifier: GPL-2.0-only
/*
 * Intel I/OAT DMA Linux driver
 * Copyright(c) 2004 - 2015 Intel Corporation.
 */

#include <linux/init.h>
#include <linux/module.h>
#include <linux/dmaengine.h>
#include <linux/pci.h>
#include "dma.h"
#include "registers.h"
#include "hw.h"

#include "../dmaengine.h"

static ssize_t cap_show(struct dma_chan *c, char *page)
{
        struct dma_device *dma = c->device;

        return sprintf(page, "copy%s%s%s%s%s\n",
                       dma_has_cap(DMA_PQ, dma->cap_mask) ? " pq" : "",
                       dma_has_cap(DMA_PQ_VAL, dma->cap_mask) ? " pq_val" : "",
                       dma_has_cap(DMA_XOR, dma->cap_mask) ? " xor" : "",
                       dma_has_cap(DMA_XOR_VAL, dma->cap_mask) ? " xor_val" : "",
                       dma_has_cap(DMA_INTERRUPT, dma->cap_mask) ? " intr" : "");

}
struct ioat_sysfs_entry ioat_cap_attr = __ATTR_RO(cap);

static ssize_t version_show(struct dma_chan *c, char *page)
{
        struct dma_device *dma = c->device;
        struct ioatdma_device *ioat_dma = to_ioatdma_device(dma);

        return sprintf(page, "%d.%d\n",
                       ioat_dma->version >> 4, ioat_dma->version & 0xf);
}
struct ioat_sysfs_entry ioat_version_attr = __ATTR_RO(version);

static ssize_t
ioat_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
{
        struct ioat_sysfs_entry *entry;
        struct ioatdma_chan *ioat_chan;

        entry = container_of(attr, struct ioat_sysfs_entry, attr);
        ioat_chan = container_of(kobj, struct ioatdma_chan, kobj);

        if (!entry->show)
                return -EIO;
        return entry->show(&ioat_chan->dma_chan, page);
}

static ssize_t
ioat_attr_store(struct kobject *kobj, struct attribute *attr,
const char *page, size_t count)
{
        struct ioat_sysfs_entry *entry;
        struct ioatdma_chan *ioat_chan;

        entry = container_of(attr, struct ioat_sysfs_entry, attr);
        ioat_chan = container_of(kobj, struct ioatdma_chan, kobj);

        if (!entry->store)
                return -EIO;
        return entry->store(&ioat_chan->dma_chan, page, count);
}

const struct sysfs_ops ioat_sysfs_ops = {
        .show   = ioat_attr_show,
        .store  = ioat_attr_store,
};

void ioat_kobject_add(struct ioatdma_device *ioat_dma, struct kobj_type *type)
{
        struct dma_device *dma = &ioat_dma->dma_dev;
        struct dma_chan *c;

        list_for_each_entry(c, &dma->channels, device_node) {
                struct ioatdma_chan *ioat_chan = to_ioat_chan(c);
                struct kobject *parent = &c->dev->device.kobj;
                int err;

                err = kobject_init_and_add(&ioat_chan->kobj, type,
                                           parent, "quickdata");
                if (err) {
                        dev_warn(to_dev(ioat_chan),
                                 "sysfs init error (%d), continuing...\n", err);
                        kobject_put(&ioat_chan->kobj);
                        set_bit(IOAT_KOBJ_INIT_FAIL, &ioat_chan->state);
                }
        }
}

void ioat_kobject_del(struct ioatdma_device *ioat_dma)
{
        struct dma_device *dma = &ioat_dma->dma_dev;
        struct dma_chan *c;

        list_for_each_entry(c, &dma->channels, device_node) {
                struct ioatdma_chan *ioat_chan = to_ioat_chan(c);

                if (!test_bit(IOAT_KOBJ_INIT_FAIL, &ioat_chan->state)) {
                        kobject_del(&ioat_chan->kobj);
                        kobject_put(&ioat_chan->kobj);
                }
        }
}

static ssize_t ring_size_show(struct dma_chan *c, char *page)
{
        struct ioatdma_chan *ioat_chan = to_ioat_chan(c);

        return sprintf(page, "%d\n", (1 << ioat_chan->alloc_order) & ~1);
}
static struct ioat_sysfs_entry ring_size_attr = __ATTR_RO(ring_size);

static ssize_t ring_active_show(struct dma_chan *c, char *page)
{
        struct ioatdma_chan *ioat_chan = to_ioat_chan(c);

        /* ...taken outside the lock, no need to be precise */
        return sprintf(page, "%d\n", ioat_ring_active(ioat_chan));
}
static struct ioat_sysfs_entry ring_active_attr = __ATTR_RO(ring_active);

static ssize_t intr_coalesce_show(struct dma_chan *c, char *page)
{
        struct ioatdma_chan *ioat_chan = to_ioat_chan(c);

        return sprintf(page, "%d\n", ioat_chan->intr_coalesce);
}

static ssize_t intr_coalesce_store(struct dma_chan *c, const char *page,
size_t count)
{
        int intr_coalesce = 0;
        struct ioatdma_chan *ioat_chan = to_ioat_chan(c);

        if (sscanf(page, "%du", &intr_coalesce) != -1) {
                if ((intr_coalesce < 0) ||
                    (intr_coalesce > IOAT_INTRDELAY_MASK))
                        return -EINVAL;
                ioat_chan->intr_coalesce = intr_coalesce;
        }

        return count;
}

static struct ioat_sysfs_entry intr_coalesce_attr = __ATTR_RW(intr_coalesce);

static struct attribute *ioat_attrs[] = {
        &ring_size_attr.attr,
        &ring_active_attr.attr,
        &ioat_cap_attr.attr,
        &ioat_version_attr.attr,
        &intr_coalesce_attr.attr,
        NULL,
};
ATTRIBUTE_GROUPS(ioat);

struct kobj_type ioat_ktype = {
        .sysfs_ops = &ioat_sysfs_ops,
        .default_groups = ioat_groups,
};