1/*
  2 * Intel I/OAT DMA Linux driver
  3 * Copyright(c) 2004 - 2015 Intel Corporation.
  4 *
  5 * This program is free software; you can redistribute it and/or modify it
  6 * under the terms and conditions of the GNU General Public License,
  7 * version 2, as published by the Free Software Foundation.
  8 *
  9 * This program is distributed in the hope that it will be useful, but WITHOUT
 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 11 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 12 * more details.
 13 *
 14 * The full GNU General Public License is included in this distribution in
 15 * the file called "COPYING".
 16 *
 17 */
 18
 19#include <linux/init.h>
 20#include <linux/module.h>
 21#include <linux/dmaengine.h>
 22#include <linux/pci.h>
 23#include "dma.h"
 24#include "registers.h"
 25#include "hw.h"
 26
 27#include "../dmaengine.h"
 28
 29static ssize_t cap_show(struct dma_chan *c, char *page)
 30{
 31	struct dma_device *dma = c->device;
 32
 33	return sprintf(page, "copy%s%s%s%s%s\n",
 34		       dma_has_cap(DMA_PQ, dma->cap_mask) ? " pq" : "",
 35		       dma_has_cap(DMA_PQ_VAL, dma->cap_mask) ? " pq_val" : "",
 36		       dma_has_cap(DMA_XOR, dma->cap_mask) ? " xor" : "",
 37		       dma_has_cap(DMA_XOR_VAL, dma->cap_mask) ? " xor_val" : "",
 38		       dma_has_cap(DMA_INTERRUPT, dma->cap_mask) ? " intr" : "");
 39
 40}
 41struct ioat_sysfs_entry ioat_cap_attr = __ATTR_RO(cap);
 42
 43static ssize_t version_show(struct dma_chan *c, char *page)
 44{
 45	struct dma_device *dma = c->device;
 46	struct ioatdma_device *ioat_dma = to_ioatdma_device(dma);
 47
 48	return sprintf(page, "%d.%d\n",
 49		       ioat_dma->version >> 4, ioat_dma->version & 0xf);
 50}
 51struct ioat_sysfs_entry ioat_version_attr = __ATTR_RO(version);
 52
 53static ssize_t
 54ioat_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
 55{
 56	struct ioat_sysfs_entry *entry;
 57	struct ioatdma_chan *ioat_chan;
 58
 59	entry = container_of(attr, struct ioat_sysfs_entry, attr);
 60	ioat_chan = container_of(kobj, struct ioatdma_chan, kobj);
 61
 62	if (!entry->show)
 63		return -EIO;
 64	return entry->show(&ioat_chan->dma_chan, page);
 65}
 66
 67const struct sysfs_ops ioat_sysfs_ops = {
 68	.show	= ioat_attr_show,
 69};
 70
 71void ioat_kobject_add(struct ioatdma_device *ioat_dma, struct kobj_type *type)
 72{
 73	struct dma_device *dma = &ioat_dma->dma_dev;
 74	struct dma_chan *c;
 75
 76	list_for_each_entry(c, &dma->channels, device_node) {
 77		struct ioatdma_chan *ioat_chan = to_ioat_chan(c);
 78		struct kobject *parent = &c->dev->device.kobj;
 79		int err;
 80
 81		err = kobject_init_and_add(&ioat_chan->kobj, type,
 82					   parent, "quickdata");
 83		if (err) {
 84			dev_warn(to_dev(ioat_chan),
 85				 "sysfs init error (%d), continuing...\n", err);
 86			kobject_put(&ioat_chan->kobj);
 87			set_bit(IOAT_KOBJ_INIT_FAIL, &ioat_chan->state);
 88		}
 89	}
 90}
 91
 92void ioat_kobject_del(struct ioatdma_device *ioat_dma)
 93{
 94	struct dma_device *dma = &ioat_dma->dma_dev;
 95	struct dma_chan *c;
 96
 97	list_for_each_entry(c, &dma->channels, device_node) {
 98		struct ioatdma_chan *ioat_chan = to_ioat_chan(c);
 99
100		if (!test_bit(IOAT_KOBJ_INIT_FAIL, &ioat_chan->state)) {
101			kobject_del(&ioat_chan->kobj);
102			kobject_put(&ioat_chan->kobj);
103		}
104	}
105}
106
107static ssize_t ring_size_show(struct dma_chan *c, char *page)
108{
109	struct ioatdma_chan *ioat_chan = to_ioat_chan(c);
110
111	return sprintf(page, "%d\n", (1 << ioat_chan->alloc_order) & ~1);
112}
113static struct ioat_sysfs_entry ring_size_attr = __ATTR_RO(ring_size);
114
115static ssize_t ring_active_show(struct dma_chan *c, char *page)
116{
117	struct ioatdma_chan *ioat_chan = to_ioat_chan(c);
118
119	/* ...taken outside the lock, no need to be precise */
120	return sprintf(page, "%d\n", ioat_ring_active(ioat_chan));
121}
122static struct ioat_sysfs_entry ring_active_attr = __ATTR_RO(ring_active);
123
124static struct attribute *ioat_attrs[] = {
125	&ring_size_attr.attr,
126	&ring_active_attr.attr,
127	&ioat_cap_attr.attr,
128	&ioat_version_attr.attr,
129	NULL,
130};
131
132struct kobj_type ioat_ktype = {
133	.sysfs_ops = &ioat_sysfs_ops,
134	.default_attrs = ioat_attrs,
135};