09177e85d6
Due to occasional DMA channel hangs observed for I/OAT versions 1.2 and 2.0 a watchdog has been introduced to check every 2 seconds if all channels progress normally. If stuck channel is detected, driver resets it. The reset is done in two parts. The second part is scheduled by the first one to reinitialize the channel after the restart. Signed-off-by: Maciej Sosnowski <maciej.sosnowski@intel.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
145 lines
4 KiB
C
145 lines
4 KiB
C
/*
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* Copyright(c) 2004 - 2007 Intel Corporation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc., 59
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* Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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* The full GNU General Public License is included in this distribution in the
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* file called COPYING.
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*/
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#ifndef IOATDMA_H
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#define IOATDMA_H
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#include <linux/dmaengine.h>
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#include "ioatdma_hw.h"
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#include <linux/init.h>
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#include <linux/dmapool.h>
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#include <linux/cache.h>
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#include <linux/pci_ids.h>
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#define IOAT_DMA_VERSION "2.18"
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enum ioat_interrupt {
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none = 0,
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msix_multi_vector = 1,
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msix_single_vector = 2,
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msi = 3,
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intx = 4,
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};
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#define IOAT_LOW_COMPLETION_MASK 0xffffffc0
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#define IOAT_DMA_DCA_ANY_CPU ~0
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#define IOAT_WATCHDOG_PERIOD (2 * HZ)
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/**
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* struct ioatdma_device - internal representation of a IOAT device
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* @pdev: PCI-Express device
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* @reg_base: MMIO register space base address
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* @dma_pool: for allocating DMA descriptors
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* @common: embedded struct dma_device
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* @version: version of ioatdma device
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* @irq_mode: which style irq to use
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* @msix_entries: irq handlers
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* @idx: per channel data
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*/
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struct ioatdma_device {
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struct pci_dev *pdev;
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void __iomem *reg_base;
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struct pci_pool *dma_pool;
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struct pci_pool *completion_pool;
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struct dma_device common;
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u8 version;
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enum ioat_interrupt irq_mode;
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struct delayed_work work;
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struct msix_entry msix_entries[4];
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struct ioat_dma_chan *idx[4];
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};
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/**
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* struct ioat_dma_chan - internal representation of a DMA channel
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*/
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struct ioat_dma_chan {
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void __iomem *reg_base;
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dma_cookie_t completed_cookie;
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unsigned long last_completion;
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unsigned long last_completion_time;
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size_t xfercap; /* XFERCAP register value expanded out */
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spinlock_t cleanup_lock;
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spinlock_t desc_lock;
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struct list_head free_desc;
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struct list_head used_desc;
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unsigned long watchdog_completion;
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int watchdog_tcp_cookie;
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u32 watchdog_last_tcp_cookie;
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struct delayed_work work;
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int pending;
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int dmacount;
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int desccount;
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struct ioatdma_device *device;
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struct dma_chan common;
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dma_addr_t completion_addr;
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union {
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u64 full; /* HW completion writeback */
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struct {
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u32 low;
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u32 high;
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};
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} *completion_virt;
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unsigned long last_compl_desc_addr_hw;
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struct tasklet_struct cleanup_task;
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};
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/* wrapper around hardware descriptor format + additional software fields */
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/**
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* struct ioat_desc_sw - wrapper around hardware descriptor
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* @hw: hardware DMA descriptor
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* @node: this descriptor will either be on the free list,
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* or attached to a transaction list (async_tx.tx_list)
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* @tx_cnt: number of descriptors required to complete the transaction
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* @async_tx: the generic software descriptor for all engines
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*/
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struct ioat_desc_sw {
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struct ioat_dma_descriptor *hw;
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struct list_head node;
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int tx_cnt;
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size_t len;
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dma_addr_t src;
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dma_addr_t dst;
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struct dma_async_tx_descriptor async_tx;
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};
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#if defined(CONFIG_INTEL_IOATDMA) || defined(CONFIG_INTEL_IOATDMA_MODULE)
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struct ioatdma_device *ioat_dma_probe(struct pci_dev *pdev,
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void __iomem *iobase);
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void ioat_dma_remove(struct ioatdma_device *device);
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struct dca_provider *ioat_dca_init(struct pci_dev *pdev, void __iomem *iobase);
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struct dca_provider *ioat2_dca_init(struct pci_dev *pdev, void __iomem *iobase);
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#else
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#define ioat_dma_probe(pdev, iobase) NULL
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#define ioat_dma_remove(device) do { } while (0)
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#define ioat_dca_init(pdev, iobase) NULL
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#define ioat2_dca_init(pdev, iobase) NULL
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#endif
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#endif /* IOATDMA_H */
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