/* * Copyright(c) 2004 - 2007 Intel Corporation. All rights reserved. * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the Free * Software Foundation; either version 2 of the License, or (at your option) * any later version. * * This program is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for * more details. * * You should have received a copy of the GNU General Public License along with * this program; if not, write to the Free Software Foundation, Inc., 59 * Temple Place - Suite 330, Boston, MA 02111-1307, USA. * * The full GNU General Public License is included in this distribution in the * file called COPYING. */ #ifndef IOATDMA_H #define IOATDMA_H #include <linux/dmaengine.h> #include "ioatdma_hw.h" #include <linux/init.h> #include <linux/dmapool.h> #include <linux/cache.h> #include <linux/pci_ids.h> #include <net/tcp.h> #define IOAT_DMA_VERSION "3.30" enum ioat_interrupt { none = 0, msix_multi_vector = 1, msix_single_vector = 2, msi = 3, intx = 4, }; #define IOAT_LOW_COMPLETION_MASK 0xffffffc0 #define IOAT_DMA_DCA_ANY_CPU ~0 #define IOAT_WATCHDOG_PERIOD (2 * HZ) /** * struct ioatdma_device - internal representation of a IOAT device * @pdev: PCI-Express device * @reg_base: MMIO register space base address * @dma_pool: for allocating DMA descriptors * @common: embedded struct dma_device * @version: version of ioatdma device * @irq_mode: which style irq to use * @msix_entries: irq handlers * @idx: per channel data */ struct ioatdma_device { struct pci_dev *pdev; void __iomem *reg_base; struct pci_pool *dma_pool; struct pci_pool *completion_pool; struct dma_device common; u8 version; enum ioat_interrupt irq_mode; struct delayed_work work; struct msix_entry msix_entries[4]; struct ioat_dma_chan *idx[4]; }; /** * struct ioat_dma_chan - internal representation of a DMA channel */ struct ioat_dma_chan { void __iomem *reg_base; dma_cookie_t completed_cookie; unsigned long last_completion; unsigned long last_completion_time; size_t xfercap; /* XFERCAP register value expanded out */ spinlock_t cleanup_lock; spinlock_t desc_lock; struct list_head free_desc; struct list_head used_desc; unsigned long watchdog_completion; int watchdog_tcp_cookie; u32 watchdog_last_tcp_cookie; struct delayed_work work; int pending; int dmacount; int desccount; struct ioatdma_device *device; struct dma_chan common; dma_addr_t completion_addr; union { u64 full; /* HW completion writeback */ struct { u32 low; u32 high; }; } *completion_virt; unsigned long last_compl_desc_addr_hw; struct tasklet_struct cleanup_task; }; /* wrapper around hardware descriptor format + additional software fields */ /** * struct ioat_desc_sw - wrapper around hardware descriptor * @hw: hardware DMA descriptor * @node: this descriptor will either be on the free list, * or attached to a transaction list (async_tx.tx_list) * @tx_cnt: number of descriptors required to complete the transaction * @async_tx: the generic software descriptor for all engines */ struct ioat_desc_sw { struct ioat_dma_descriptor *hw; struct list_head node; int tx_cnt; size_t len; dma_addr_t src; dma_addr_t dst; struct dma_async_tx_descriptor async_tx; }; static inline void ioat_set_tcp_copy_break(struct ioatdma_device *dev) { #ifdef CONFIG_NET_DMA switch (dev->version) { case IOAT_VER_1_2: case IOAT_VER_3_0: sysctl_tcp_dma_copybreak = 4096; break; case IOAT_VER_2_0: sysctl_tcp_dma_copybreak = 2048; break; } #endif } #if defined(CONFIG_INTEL_IOATDMA) || defined(CONFIG_INTEL_IOATDMA_MODULE) struct ioatdma_device *ioat_dma_probe(struct pci_dev *pdev, void __iomem *iobase); void ioat_dma_remove(struct ioatdma_device *device); struct dca_provider *ioat_dca_init(struct pci_dev *pdev, void __iomem *iobase); struct dca_provider *ioat2_dca_init(struct pci_dev *pdev, void __iomem *iobase); struct dca_provider *ioat3_dca_init(struct pci_dev *pdev, void __iomem *iobase); #else #define ioat_dma_probe(pdev, iobase) NULL #define ioat_dma_remove(device) do { } while (0) #define ioat_dca_init(pdev, iobase) NULL #define ioat2_dca_init(pdev, iobase) NULL #define ioat3_dca_init(pdev, iobase) NULL #endif #endif /* IOATDMA_H */