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
 67static ssize_t
 68ioat_attr_store(struct kobject *kobj, struct attribute *attr,
 69const char *page, size_t count)
 70{
 71	struct ioat_sysfs_entry *entry;
 72	struct ioatdma_chan *ioat_chan;
 73
 74	entry = container_of(attr, struct ioat_sysfs_entry, attr);
 75	ioat_chan = container_of(kobj, struct ioatdma_chan, kobj);
 76
 77	if (!entry->store)
 78		return -EIO;
 79	return entry->store(&ioat_chan->dma_chan, page, count);
 80}
 81
 82const struct sysfs_ops ioat_sysfs_ops = {
 83	.show	= ioat_attr_show,
 84	.store  = ioat_attr_store,
 85};
 86
 87void ioat_kobject_add(struct ioatdma_device *ioat_dma, struct kobj_type *type)
 88{
 89	struct dma_device *dma = &ioat_dma->dma_dev;
 90	struct dma_chan *c;
 91
 92	list_for_each_entry(c, &dma->channels, device_node) {
 93		struct ioatdma_chan *ioat_chan = to_ioat_chan(c);
 94		struct kobject *parent = &c->dev->device.kobj;
 95		int err;
 96
 97		err = kobject_init_and_add(&ioat_chan->kobj, type,
 98					   parent, "quickdata");
 99		if (err) {
100			dev_warn(to_dev(ioat_chan),
101				 "sysfs init error (%d), continuing...\n", err);
102			kobject_put(&ioat_chan->kobj);
103			set_bit(IOAT_KOBJ_INIT_FAIL, &ioat_chan->state);
104		}
105	}
106}
107
108void ioat_kobject_del(struct ioatdma_device *ioat_dma)
109{
110	struct dma_device *dma = &ioat_dma->dma_dev;
111	struct dma_chan *c;
112
113	list_for_each_entry(c, &dma->channels, device_node) {
114		struct ioatdma_chan *ioat_chan = to_ioat_chan(c);
115
116		if (!test_bit(IOAT_KOBJ_INIT_FAIL, &ioat_chan->state)) {
117			kobject_del(&ioat_chan->kobj);
118			kobject_put(&ioat_chan->kobj);
119		}
120	}
121}
122
123static ssize_t ring_size_show(struct dma_chan *c, char *page)
124{
125	struct ioatdma_chan *ioat_chan = to_ioat_chan(c);
126
127	return sprintf(page, "%d\n", (1 << ioat_chan->alloc_order) & ~1);
128}
129static struct ioat_sysfs_entry ring_size_attr = __ATTR_RO(ring_size);
130
131static ssize_t ring_active_show(struct dma_chan *c, char *page)
132{
133	struct ioatdma_chan *ioat_chan = to_ioat_chan(c);
134
135	/* ...taken outside the lock, no need to be precise */
136	return sprintf(page, "%d\n", ioat_ring_active(ioat_chan));
137}
138static struct ioat_sysfs_entry ring_active_attr = __ATTR_RO(ring_active);
139
140static ssize_t intr_coalesce_show(struct dma_chan *c, char *page)
141{
142	struct ioatdma_chan *ioat_chan = to_ioat_chan(c);
143
144	return sprintf(page, "%d\n", ioat_chan->intr_coalesce);
145}
146
147static ssize_t intr_coalesce_store(struct dma_chan *c, const char *page,
148size_t count)
149{
150	int intr_coalesce = 0;
151	struct ioatdma_chan *ioat_chan = to_ioat_chan(c);
152
153	if (sscanf(page, "%du", &intr_coalesce) != -1) {
154		if ((intr_coalesce < 0) ||
155		    (intr_coalesce > IOAT_INTRDELAY_MASK))
156			return -EINVAL;
157		ioat_chan->intr_coalesce = intr_coalesce;
158	}
159
160	return count;
161}
162
163static struct ioat_sysfs_entry intr_coalesce_attr = __ATTR_RW(intr_coalesce);
164
165static struct attribute *ioat_attrs[] = {
166	&ring_size_attr.attr,
167	&ring_active_attr.attr,
168	&ioat_cap_attr.attr,
169	&ioat_version_attr.attr,
170	&intr_coalesce_attr.attr,
171	NULL,
172};
173
174struct kobj_type ioat_ktype = {
175	.sysfs_ops = &ioat_sysfs_ops,
176	.default_attrs = ioat_attrs,
177};