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ioat: add 'ioat' sysfs attributes

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Export driver attributes for diagnostic purposes:
'ring_size': total number of descriptors available to the engine
'ring_active': number of descriptors in-flight
'capabilities': supported operation types for this channel
'version': Intel(R) QuickData specfication revision

This also allows some chattiness to be removed from the driver startup
as this information is now available via sysfs.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Dan Williams
2009-09-08 17:42:56 -07:00
parent bf40a6869c
commit 5669e31c5a
6 changed files with 166 additions and 6 deletions
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120
drivers/dma/ioat/dma.c
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@@ -263,6 +263,7 @@ static dma_cookie_t ioat1_tx_submit(struct dma_async_tx_descriptor *tx)
if (!test_and_set_bit(IOAT_COMPLETION_PENDING, &chan->state))
mod_timer(&chan->timer, jiffies + COMPLETION_TIMEOUT);
ioat->active += desc->hw->tx_cnt;
ioat->pending += desc->hw->tx_cnt;
if (ioat->pending >= ioat_pending_level)
__ioat1_dma_memcpy_issue_pending(ioat);
@@ -611,6 +612,7 @@ static void __cleanup(struct ioat_dma_chan *ioat, unsigned long phys_complete)
chan->completed_cookie = tx->cookie;
tx->cookie = 0;
ioat_dma_unmap(chan, tx->flags, desc->len, desc->hw);
ioat->active -= desc->hw->tx_cnt;
if (tx->callback) {
tx->callback(tx->callback_param);
tx->callback = NULL;
@@ -1028,13 +1030,8 @@ int __devinit ioat_probe(struct ioatdma_device *device)
dma_cap_set(DMA_MEMCPY, dma->cap_mask);
dma->dev = &pdev->dev;
dev_err(dev, "Intel(R) I/OAT DMA Engine found,"
" %d channels, device version 0x%02x, driver version %s\n",
dma->chancnt, device->version, IOAT_DMA_VERSION);
if (!dma->chancnt) {
dev_err(dev, "Intel(R) I/OAT DMA Engine problem found: "
"zero channels detected\n");
dev_err(dev, "zero channels detected\n");
goto err_setup_interrupts;
}
@@ -1085,6 +1082,113 @@ static void ioat1_intr_quirk(struct ioatdma_device *device)
pci_write_config_dword(pdev, IOAT_PCI_DMACTRL_OFFSET, dmactrl);
}
static ssize_t ring_size_show(struct dma_chan *c, char *page)
{
struct ioat_dma_chan *ioat = to_ioat_chan(c);
return sprintf(page, "%d\n", ioat->desccount);
}
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 ioat_dma_chan *ioat = to_ioat_chan(c);
return sprintf(page, "%d\n", ioat->active);
}
static struct ioat_sysfs_entry ring_active_attr = __ATTR_RO(ring_active);
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%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_MEMSET, dma->cap_mask) ? " fill" : "",
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 *device = to_ioatdma_device(dma);
return sprintf(page, "%d.%d\n",
device->version >> 4, device->version & 0xf);
}
struct ioat_sysfs_entry ioat_version_attr = __ATTR_RO(version);
static struct attribute *ioat1_attrs[] = {
&ring_size_attr.attr,
&ring_active_attr.attr,
&ioat_cap_attr.attr,
&ioat_version_attr.attr,
NULL,
};
static ssize_t
ioat_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
{
struct ioat_sysfs_entry *entry;
struct ioat_chan_common *chan;
entry = container_of(attr, struct ioat_sysfs_entry, attr);
chan = container_of(kobj, struct ioat_chan_common, kobj);
if (!entry->show)
return -EIO;
return entry->show(&chan->common, page);
}
struct sysfs_ops ioat_sysfs_ops = {
.show = ioat_attr_show,
};
static struct kobj_type ioat1_ktype = {
.sysfs_ops = &ioat_sysfs_ops,
.default_attrs = ioat1_attrs,
};
void ioat_kobject_add(struct ioatdma_device *device, struct kobj_type *type)
{
struct dma_device *dma = &device->common;
struct dma_chan *c;
list_for_each_entry(c, &dma->channels, device_node) {
struct ioat_chan_common *chan = to_chan_common(c);
struct kobject *parent = &c->dev->device.kobj;
int err;
err = kobject_init_and_add(&chan->kobj, type, parent, "quickdata");
if (err) {
dev_warn(to_dev(chan),
"sysfs init error (%d), continuing...\n", err);
kobject_put(&chan->kobj);
set_bit(IOAT_KOBJ_INIT_FAIL, &chan->state);
}
}
}
void ioat_kobject_del(struct ioatdma_device *device)
{
struct dma_device *dma = &device->common;
struct dma_chan *c;
list_for_each_entry(c, &dma->channels, device_node) {
struct ioat_chan_common *chan = to_chan_common(c);
if (!test_bit(IOAT_KOBJ_INIT_FAIL, &chan->state)) {
kobject_del(&chan->kobj);
kobject_put(&chan->kobj);
}
}
}
int __devinit ioat1_dma_probe(struct ioatdma_device *device, int dca)
{
struct pci_dev *pdev = device->pdev;
@@ -1107,6 +1211,8 @@ int __devinit ioat1_dma_probe(struct ioatdma_device *device, int dca)
err = ioat_register(device);
if (err)
return err;
ioat_kobject_add(device, &ioat1_ktype);
if (dca)
device->dca = ioat_dca_init(pdev, device->reg_base);
@@ -1119,6 +1225,8 @@ void __devexit ioat_dma_remove(struct ioatdma_device *device)
ioat_disable_interrupts(device);
ioat_kobject_del(device);
dma_async_device_unregister(dma);
pci_pool_destroy(device->dma_pool);