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dmaengine: idxd: connect idxd to dmaengine subsystem

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Add plumbing for dmaengine subsystem connection. The driver register a DMA
device per DSA device. The channels are dynamically registered when a
workqueue is configured to be "kernel:dmanegine" type.

Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Link: https://lore.kernel.org/r/157965026376.73301.13867988830650740445.stgit@djiang5-desk3.ch.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Dave Jiang
2020-01-21 16:44:23 -07:00
committed by Vinod Koul
parent d1dfe5b8ac
commit 8f47d1a5e5
8 changed files with 391 additions and 2 deletions
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30
drivers/dma/idxd/init.c
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@@ -15,6 +15,8 @@
#include <linux/device.h>
#include <linux/idr.h>
#include <uapi/linux/idxd.h>
#include <linux/dmaengine.h>
#include "../dmaengine.h"
#include "registers.h"
#include "idxd.h"
@@ -396,6 +398,32 @@ static int idxd_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
return 0;
}
static void idxd_flush_pending_llist(struct idxd_irq_entry *ie)
{
struct idxd_desc *desc, *itr;
struct llist_node *head;
head = llist_del_all(&ie->pending_llist);
if (!head)
return;
llist_for_each_entry_safe(desc, itr, head, llnode) {
idxd_dma_complete_txd(desc, IDXD_COMPLETE_ABORT);
idxd_free_desc(desc->wq, desc);
}
}
static void idxd_flush_work_list(struct idxd_irq_entry *ie)
{
struct idxd_desc *desc, *iter;
list_for_each_entry_safe(desc, iter, &ie->work_list, list) {
list_del(&desc->list);
idxd_dma_complete_txd(desc, IDXD_COMPLETE_ABORT);
idxd_free_desc(desc->wq, desc);
}
}
static void idxd_shutdown(struct pci_dev *pdev)
{
struct idxd_device *idxd = pci_get_drvdata(pdev);
@@ -419,6 +447,8 @@ static void idxd_shutdown(struct pci_dev *pdev)
synchronize_irq(idxd->msix_entries[i].vector);
if (i == 0)
continue;
idxd_flush_pending_llist(irq_entry);
idxd_flush_work_list(irq_entry);
}
}