forked from Minki/linux
7f2b291f56
The change to the async_tx interface cost this driver some performance by spreading the descriptor setup across several functions, including multiple passes over the new descriptor chain. Here we bring the work back into one primary function and only do one pass. [akpm@linux-foundation.org: cleanups, uninline] Signed-off-by: Shannon Nelson <shannon.nelson@intel.com> Cc: Dan Williams <dan.j.williams@intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
146 lines
3.8 KiB
C
146 lines
3.8 KiB
C
/*
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* Copyright(c) 2004 - 2006 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 "1.26"
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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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/**
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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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*/
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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 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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* @device:
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* @reg_base:
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* @sw_in_use:
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* @completion:
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* @completion_low:
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* @completion_high:
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* @completed_cookie: last cookie seen completed on cleanup
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* @cookie: value of last cookie given to client
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* @last_completion:
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* @xfercap:
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* @desc_lock:
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* @free_desc:
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* @used_desc:
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* @resource:
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* @device_node:
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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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u32 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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int pending;
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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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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,
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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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#endif
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#endif /* IOATDMA_H */
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