drivers/dma/ioat/sysfs.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Intel I/OAT DMA Linux driver
   4  * Copyright(c) 2004 - 2015 Intel Corporation.
   5  */
   6
   7 #include <linux/init.h>
   8 #include <linux/module.h>
   9 #include <linux/dmaengine.h>
  10 #include <linux/pci.h>
  11 #include "dma.h"
  12 #include "registers.h"
  13 #include "hw.h"
  14
  15 #include "../dmaengine.h"
  16
  17 static ssize_t cap_show(struct dma_chan *c, char *page)
  18 {
  19         struct dma_device *dma = c->device;
  20
  21         return sprintf(page, "copy%s%s%s%s%s\n",
  22                        dma_has_cap(DMA_PQ, dma->cap_mask) ? " pq" : "",
  23                        dma_has_cap(DMA_PQ_VAL, dma->cap_mask) ? " pq_val" : "",
  24                        dma_has_cap(DMA_XOR, dma->cap_mask) ? " xor" : "",
  25                        dma_has_cap(DMA_XOR_VAL, dma->cap_mask) ? " xor_val" : "",
  26                        dma_has_cap(DMA_INTERRUPT, dma->cap_mask) ? " intr" : "");
  27
  28 }
  29 struct ioat_sysfs_entry ioat_cap_attr = __ATTR_RO(cap);
  30
  31 static ssize_t version_show(struct dma_chan *c, char *page)
  32 {
  33         struct dma_device *dma = c->device;
  34         struct ioatdma_device *ioat_dma = to_ioatdma_device(dma);
  35
  36         return sprintf(page, "%d.%d\n",
  37                        ioat_dma->version >> 4, ioat_dma->version & 0xf);
  38 }
  39 struct ioat_sysfs_entry ioat_version_attr = __ATTR_RO(version);
  40
  41 static ssize_t
  42 ioat_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
  43 {
  44         struct ioat_sysfs_entry *entry;
  45         struct ioatdma_chan *ioat_chan;
  46
  47         entry = container_of(attr, struct ioat_sysfs_entry, attr);
  48         ioat_chan = container_of(kobj, struct ioatdma_chan, kobj);
  49
  50         if (!entry->show)
  51                 return -EIO;
  52         return entry->show(&ioat_chan->dma_chan, page);
  53 }
  54
  55 static ssize_t
  56 ioat_attr_store(struct kobject *kobj, struct attribute *attr,
  57 const char *page, size_t count)
  58 {
  59         struct ioat_sysfs_entry *entry;
  60         struct ioatdma_chan *ioat_chan;
  61
  62         entry = container_of(attr, struct ioat_sysfs_entry, attr);
  63         ioat_chan = container_of(kobj, struct ioatdma_chan, kobj);
  64
  65         if (!entry->store)
  66                 return -EIO;
  67         return entry->store(&ioat_chan->dma_chan, page, count);
  68 }
  69
  70 const struct sysfs_ops ioat_sysfs_ops = {
  71         .show   = ioat_attr_show,
  72         .store  = ioat_attr_store,
  73 };
  74
  75 void ioat_kobject_add(struct ioatdma_device *ioat_dma, struct kobj_type *type)
  76 {
  77         struct dma_device *dma = &ioat_dma->dma_dev;
  78         struct dma_chan *c;
  79
  80         list_for_each_entry(c, &dma->channels, device_node) {
  81                 struct ioatdma_chan *ioat_chan = to_ioat_chan(c);
  82                 struct kobject *parent = &c->dev->device.kobj;
  83                 int err;
  84
  85                 err = kobject_init_and_add(&ioat_chan->kobj, type,
  86                                            parent, "quickdata");
  87                 if (err) {
  88                         dev_warn(to_dev(ioat_chan),
  89                                  "sysfs init error (%d), continuing...\n", err);
  90                         kobject_put(&ioat_chan->kobj);
  91                         set_bit(IOAT_KOBJ_INIT_FAIL, &ioat_chan->state);
  92                 }
  93         }
  94 }
  95
  96 void ioat_kobject_del(struct ioatdma_device *ioat_dma)
  97 {
  98         struct dma_device *dma = &ioat_dma->dma_dev;
  99         struct dma_chan *c;
 100
 101         list_for_each_entry(c, &dma->channels, device_node) {
 102                 struct ioatdma_chan *ioat_chan = to_ioat_chan(c);
 103
 104                 if (!test_bit(IOAT_KOBJ_INIT_FAIL, &ioat_chan->state)) {
 105                         kobject_del(&ioat_chan->kobj);
 106                         kobject_put(&ioat_chan->kobj);
 107                 }
 108         }
 109 }
 110
 111 static ssize_t ring_size_show(struct dma_chan *c, char *page)
 112 {
 113         struct ioatdma_chan *ioat_chan = to_ioat_chan(c);
 114
 115         return sprintf(page, "%d\n", (1 << ioat_chan->alloc_order) & ~1);
 116 }
 117 static struct ioat_sysfs_entry ring_size_attr = __ATTR_RO(ring_size);
 118
 119 static ssize_t ring_active_show(struct dma_chan *c, char *page)
 120 {
 121         struct ioatdma_chan *ioat_chan = to_ioat_chan(c);
 122
 123         /* ...taken outside the lock, no need to be precise */
 124         return sprintf(page, "%d\n", ioat_ring_active(ioat_chan));
 125 }
 126 static struct ioat_sysfs_entry ring_active_attr = __ATTR_RO(ring_active);
 127
 128 static ssize_t intr_coalesce_show(struct dma_chan *c, char *page)
 129 {
 130         struct ioatdma_chan *ioat_chan = to_ioat_chan(c);
 131
 132         return sprintf(page, "%d\n", ioat_chan->intr_coalesce);
 133 }
 134
 135 static ssize_t intr_coalesce_store(struct dma_chan *c, const char *page,
 136 size_t count)
 137 {
 138         int intr_coalesce = 0;
 139         struct ioatdma_chan *ioat_chan = to_ioat_chan(c);
 140
 141         if (sscanf(page, "%du", &intr_coalesce) != -1) {
 142                 if ((intr_coalesce < 0) ||
 143                     (intr_coalesce > IOAT_INTRDELAY_MASK))
 144                         return -EINVAL;
 145                 ioat_chan->intr_coalesce = intr_coalesce;
 146         }
 147
 148         return count;
 149 }
 150
 151 static struct ioat_sysfs_entry intr_coalesce_attr = __ATTR_RW(intr_coalesce);
 152
 153 static struct attribute *ioat_attrs[] = {
 154         &ring_size_attr.attr,
 155         &ring_active_attr.attr,
 156         &ioat_cap_attr.attr,
 157         &ioat_version_attr.attr,
 158         &intr_coalesce_attr.attr,
 159         NULL,
 160 };
 161
 162 struct kobj_type ioat_ktype = {
 163         .sysfs_ops = &ioat_sysfs_ops,
 164         .default_attrs = ioat_attrs,
 165 };