diff options
Diffstat (limited to 'drivers/dma/ioat/sysfs.c')
| -rw-r--r-- | drivers/dma/ioat/sysfs.c | 166 |
1 files changed, 166 insertions, 0 deletions
diff --git a/drivers/dma/ioat/sysfs.c b/drivers/dma/ioat/sysfs.c new file mode 100644 index 000000000..168adf28c --- /dev/null +++ b/drivers/dma/ioat/sysfs.c @@ -0,0 +1,166 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Intel I/OAT DMA Linux driver + * Copyright(c) 2004 - 2015 Intel Corporation. + */ + +#include <linux/init.h> +#include <linux/module.h> +#include <linux/dmaengine.h> +#include <linux/pci.h> +#include "dma.h" +#include "registers.h" +#include "hw.h" + +#include "../dmaengine.h" + +static ssize_t cap_show(struct dma_chan *c, char *page) +{ + struct dma_device *dma = c->device; + + return sprintf(page, "copy%s%s%s%s%s\n", + dma_has_cap(DMA_PQ, dma->cap_mask) ? " pq" : "", + dma_has_cap(DMA_PQ_VAL, dma->cap_mask) ? " pq_val" : "", + dma_has_cap(DMA_XOR, dma->cap_mask) ? " xor" : "", + dma_has_cap(DMA_XOR_VAL, dma->cap_mask) ? " xor_val" : "", + dma_has_cap(DMA_INTERRUPT, dma->cap_mask) ? " intr" : ""); + +} +struct ioat_sysfs_entry ioat_cap_attr = __ATTR_RO(cap); + +static ssize_t version_show(struct dma_chan *c, char *page) +{ + struct dma_device *dma = c->device; + struct ioatdma_device *ioat_dma = to_ioatdma_device(dma); + + return sprintf(page, "%d.%d\n", + ioat_dma->version >> 4, ioat_dma->version & 0xf); +} +struct ioat_sysfs_entry ioat_version_attr = __ATTR_RO(version); + +static ssize_t +ioat_attr_show(struct kobject *kobj, struct attribute *attr, char *page) +{ + struct ioat_sysfs_entry *entry; + struct ioatdma_chan *ioat_chan; + + entry = container_of(attr, struct ioat_sysfs_entry, attr); + ioat_chan = container_of(kobj, struct ioatdma_chan, kobj); + + if (!entry->show) + return -EIO; + return entry->show(&ioat_chan->dma_chan, page); +} + +static ssize_t +ioat_attr_store(struct kobject *kobj, struct attribute *attr, +const char *page, size_t count) +{ + struct ioat_sysfs_entry *entry; + struct ioatdma_chan *ioat_chan; + + entry = container_of(attr, struct ioat_sysfs_entry, attr); + ioat_chan = container_of(kobj, struct ioatdma_chan, kobj); + + if (!entry->store) + return -EIO; + return entry->store(&ioat_chan->dma_chan, page, count); +} + +const struct sysfs_ops ioat_sysfs_ops = { + .show = ioat_attr_show, + .store = ioat_attr_store, +}; + +void ioat_kobject_add(struct ioatdma_device *ioat_dma, struct kobj_type *type) +{ + struct dma_device *dma = &ioat_dma->dma_dev; + struct dma_chan *c; + + list_for_each_entry(c, &dma->channels, device_node) { + struct ioatdma_chan *ioat_chan = to_ioat_chan(c); + struct kobject *parent = &c->dev->device.kobj; + int err; + + err = kobject_init_and_add(&ioat_chan->kobj, type, + parent, "quickdata"); + if (err) { + dev_warn(to_dev(ioat_chan), + "sysfs init error (%d), continuing...\n", err); + kobject_put(&ioat_chan->kobj); + set_bit(IOAT_KOBJ_INIT_FAIL, &ioat_chan->state); + } + } +} + +void ioat_kobject_del(struct ioatdma_device *ioat_dma) +{ + struct dma_device *dma = &ioat_dma->dma_dev; + struct dma_chan *c; + + list_for_each_entry(c, &dma->channels, device_node) { + struct ioatdma_chan *ioat_chan = to_ioat_chan(c); + + if (!test_bit(IOAT_KOBJ_INIT_FAIL, &ioat_chan->state)) { + kobject_del(&ioat_chan->kobj); + kobject_put(&ioat_chan->kobj); + } + } +} + +static ssize_t ring_size_show(struct dma_chan *c, char *page) +{ + struct ioatdma_chan *ioat_chan = to_ioat_chan(c); + + return sprintf(page, "%d\n", (1 << ioat_chan->alloc_order) & ~1); +} +static struct ioat_sysfs_entry ring_size_attr = __ATTR_RO(ring_size); + +static ssize_t ring_active_show(struct dma_chan *c, char *page) +{ + struct ioatdma_chan *ioat_chan = to_ioat_chan(c); + + /* ...taken outside the lock, no need to be precise */ + return sprintf(page, "%d\n", ioat_ring_active(ioat_chan)); +} +static struct ioat_sysfs_entry ring_active_attr = __ATTR_RO(ring_active); + +static ssize_t intr_coalesce_show(struct dma_chan *c, char *page) +{ + struct ioatdma_chan *ioat_chan = to_ioat_chan(c); + + return sprintf(page, "%d\n", ioat_chan->intr_coalesce); +} + +static ssize_t intr_coalesce_store(struct dma_chan *c, const char *page, +size_t count) +{ + int intr_coalesce = 0; + struct ioatdma_chan *ioat_chan = to_ioat_chan(c); + + if (sscanf(page, "%du", &intr_coalesce) != -1) { + if ((intr_coalesce < 0) || + (intr_coalesce > IOAT_INTRDELAY_MASK)) + return -EINVAL; + ioat_chan->intr_coalesce = intr_coalesce; + } + + return count; +} + +static struct ioat_sysfs_entry intr_coalesce_attr = __ATTR_RW(intr_coalesce); + +static struct attribute *ioat_attrs[] = { + &ring_size_attr.attr, + &ring_active_attr.attr, + &ioat_cap_attr.attr, + &ioat_version_attr.attr, + &intr_coalesce_attr.attr, + NULL, +}; +ATTRIBUTE_GROUPS(ioat); + +struct kobj_type ioat_ktype = { + .sysfs_ops = &ioat_sysfs_ops, + .default_groups = ioat_groups, +}; |