166 lines
4.3 KiB
C
166 lines
4.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Intel I/OAT DMA Linux driver
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* Copyright(c) 2004 - 2015 Intel Corporation.
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/dmaengine.h>
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#include <linux/pci.h>
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#include "dma.h"
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#include "registers.h"
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#include "hw.h"
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#include "../dmaengine.h"
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static ssize_t cap_show(struct dma_chan *c, char *page)
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{
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struct dma_device *dma = c->device;
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return sprintf(page, "copy%s%s%s%s%s\n",
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dma_has_cap(DMA_PQ, dma->cap_mask) ? " pq" : "",
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dma_has_cap(DMA_PQ_VAL, dma->cap_mask) ? " pq_val" : "",
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dma_has_cap(DMA_XOR, dma->cap_mask) ? " xor" : "",
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dma_has_cap(DMA_XOR_VAL, dma->cap_mask) ? " xor_val" : "",
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dma_has_cap(DMA_INTERRUPT, dma->cap_mask) ? " intr" : "");
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}
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struct ioat_sysfs_entry ioat_cap_attr = __ATTR_RO(cap);
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static ssize_t version_show(struct dma_chan *c, char *page)
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{
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struct dma_device *dma = c->device;
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struct ioatdma_device *ioat_dma = to_ioatdma_device(dma);
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return sprintf(page, "%d.%d\n",
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ioat_dma->version >> 4, ioat_dma->version & 0xf);
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}
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struct ioat_sysfs_entry ioat_version_attr = __ATTR_RO(version);
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static ssize_t
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ioat_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
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{
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struct ioat_sysfs_entry *entry;
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struct ioatdma_chan *ioat_chan;
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entry = container_of(attr, struct ioat_sysfs_entry, attr);
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ioat_chan = container_of(kobj, struct ioatdma_chan, kobj);
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if (!entry->show)
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return -EIO;
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return entry->show(&ioat_chan->dma_chan, page);
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}
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static ssize_t
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ioat_attr_store(struct kobject *kobj, struct attribute *attr,
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const char *page, size_t count)
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{
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struct ioat_sysfs_entry *entry;
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struct ioatdma_chan *ioat_chan;
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entry = container_of(attr, struct ioat_sysfs_entry, attr);
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ioat_chan = container_of(kobj, struct ioatdma_chan, kobj);
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if (!entry->store)
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return -EIO;
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return entry->store(&ioat_chan->dma_chan, page, count);
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}
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const struct sysfs_ops ioat_sysfs_ops = {
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.show = ioat_attr_show,
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.store = ioat_attr_store,
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};
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void ioat_kobject_add(struct ioatdma_device *ioat_dma, struct kobj_type *type)
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{
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struct dma_device *dma = &ioat_dma->dma_dev;
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struct dma_chan *c;
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list_for_each_entry(c, &dma->channels, device_node) {
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struct ioatdma_chan *ioat_chan = to_ioat_chan(c);
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struct kobject *parent = &c->dev->device.kobj;
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int err;
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err = kobject_init_and_add(&ioat_chan->kobj, type,
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parent, "quickdata");
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if (err) {
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dev_warn(to_dev(ioat_chan),
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"sysfs init error (%d), continuing...\n", err);
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kobject_put(&ioat_chan->kobj);
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set_bit(IOAT_KOBJ_INIT_FAIL, &ioat_chan->state);
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}
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}
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}
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void ioat_kobject_del(struct ioatdma_device *ioat_dma)
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{
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struct dma_device *dma = &ioat_dma->dma_dev;
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struct dma_chan *c;
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list_for_each_entry(c, &dma->channels, device_node) {
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struct ioatdma_chan *ioat_chan = to_ioat_chan(c);
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if (!test_bit(IOAT_KOBJ_INIT_FAIL, &ioat_chan->state)) {
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kobject_del(&ioat_chan->kobj);
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kobject_put(&ioat_chan->kobj);
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}
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}
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}
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static ssize_t ring_size_show(struct dma_chan *c, char *page)
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{
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struct ioatdma_chan *ioat_chan = to_ioat_chan(c);
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return sprintf(page, "%d\n", (1 << ioat_chan->alloc_order) & ~1);
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}
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static struct ioat_sysfs_entry ring_size_attr = __ATTR_RO(ring_size);
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static ssize_t ring_active_show(struct dma_chan *c, char *page)
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{
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struct ioatdma_chan *ioat_chan = to_ioat_chan(c);
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/* ...taken outside the lock, no need to be precise */
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return sprintf(page, "%d\n", ioat_ring_active(ioat_chan));
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}
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static struct ioat_sysfs_entry ring_active_attr = __ATTR_RO(ring_active);
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static ssize_t intr_coalesce_show(struct dma_chan *c, char *page)
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{
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struct ioatdma_chan *ioat_chan = to_ioat_chan(c);
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return sprintf(page, "%d\n", ioat_chan->intr_coalesce);
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}
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static ssize_t intr_coalesce_store(struct dma_chan *c, const char *page,
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size_t count)
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{
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int intr_coalesce = 0;
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struct ioatdma_chan *ioat_chan = to_ioat_chan(c);
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if (sscanf(page, "%du", &intr_coalesce) != -1) {
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if ((intr_coalesce < 0) ||
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(intr_coalesce > IOAT_INTRDELAY_MASK))
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return -EINVAL;
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ioat_chan->intr_coalesce = intr_coalesce;
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}
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return count;
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}
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static struct ioat_sysfs_entry intr_coalesce_attr = __ATTR_RW(intr_coalesce);
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static struct attribute *ioat_attrs[] = {
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&ring_size_attr.attr,
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&ring_active_attr.attr,
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&ioat_cap_attr.attr,
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&ioat_version_attr.attr,
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&intr_coalesce_attr.attr,
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NULL,
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};
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struct kobj_type ioat_ktype = {
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.sysfs_ops = &ioat_sysfs_ops,
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.default_attrs = ioat_attrs,
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};
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