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
cap_show(struct dma_chan * c,char * page)29 static 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 }
41 struct ioat_sysfs_entry ioat_cap_attr = __ATTR_RO(cap);
42
version_show(struct dma_chan * c,char * page)43 static 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 }
51 struct ioat_sysfs_entry ioat_version_attr = __ATTR_RO(version);
52
53 static ssize_t
ioat_attr_show(struct kobject * kobj,struct attribute * attr,char * page)54 ioat_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
67 const struct sysfs_ops ioat_sysfs_ops = {
68 .show = ioat_attr_show,
69 };
70
ioat_kobject_add(struct ioatdma_device * ioat_dma,struct kobj_type * type)71 void 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
ioat_kobject_del(struct ioatdma_device * ioat_dma)92 void 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
ring_size_show(struct dma_chan * c,char * page)107 static 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 }
113 static struct ioat_sysfs_entry ring_size_attr = __ATTR_RO(ring_size);
114
ring_active_show(struct dma_chan * c,char * page)115 static 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 }
122 static struct ioat_sysfs_entry ring_active_attr = __ATTR_RO(ring_active);
123
124 static 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
132 struct kobj_type ioat_ktype = {
133 .sysfs_ops = &ioat_sysfs_ops,
134 .default_attrs = ioat_attrs,
135 };
136