forked from Minki/linux
a01e28f692
This patch enables the following features: a) MSIx, MSI and legacy interrupt support. b) System Memory Page Table(SMPT) support. SMPT enables system memory access from the card. On X100 devices the host can program 32 SMPT registers each capable of accessing 16GB of system memory address space from X100 devices. The registers can thereby be used to access a cumulative 512GB of system memory address space from X100 devices at any point in time. Co-author: Sudeep Dutt <sudeep.dutt@intel.com> Signed-off-by: Ashutosh Dixit <ashutosh.dixit@intel.com> Signed-off-by: Caz Yokoyama <Caz.Yokoyama@intel.com> Signed-off-by: Dasaratharaman Chandramouli <dasaratharaman.chandramouli@intel.com> Signed-off-by: Nikhil Rao <nikhil.rao@intel.com> Signed-off-by: Harshavardhan R Kharche <harshavardhan.r.kharche@intel.com> Signed-off-by: Sudeep Dutt <sudeep.dutt@intel.com> Acked-by: Yaozu (Eddie) Dong <eddie.dong@intel.com> Reviewed-by: Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
138 lines
4.1 KiB
C
138 lines
4.1 KiB
C
/*
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* Intel MIC Platform Software Stack (MPSS)
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*
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* Copyright(c) 2013 Intel Corporation.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License, version 2, as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* The full GNU General Public License is included in this distribution in
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* the file called "COPYING".
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*
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* Intel MIC Host driver.
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*
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*/
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#ifndef _MIC_INTR_H_
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#define _MIC_INTR_H_
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/*
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* The minimum number of msix vectors required for normal operation.
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* 3 for virtio network, console and block devices.
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* 1 for card shutdown notifications.
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*/
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#define MIC_MIN_MSIX 4
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#define MIC_NUM_OFFSETS 32
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/**
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* mic_intr_source - The type of source that will generate
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* the interrupt.The number of types needs to be in sync with
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* MIC_NUM_INTR_TYPES
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*
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* MIC_INTR_DB: The source is a doorbell
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* MIC_INTR_DMA: The source is a DMA channel
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* MIC_INTR_ERR: The source is an error interrupt e.g. SBOX ERR
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* MIC_NUM_INTR_TYPES: Total number of interrupt sources.
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*/
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enum mic_intr_type {
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MIC_INTR_DB = 0,
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MIC_INTR_DMA,
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MIC_INTR_ERR,
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MIC_NUM_INTR_TYPES
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};
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/**
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* struct mic_intr_info - Contains h/w specific interrupt sources
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* information.
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*
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* @intr_start_idx: Contains the starting indexes of the
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* interrupt types.
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* @intr_len: Contains the length of the interrupt types.
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*/
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struct mic_intr_info {
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u16 intr_start_idx[MIC_NUM_INTR_TYPES];
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u16 intr_len[MIC_NUM_INTR_TYPES];
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};
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/**
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* struct mic_irq_info - OS specific irq information
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*
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* @next_avail_src: next available doorbell that can be assigned.
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* @msix_entries: msix entries allocated while setting up MSI-x
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* @mic_msi_map: The MSI/MSI-x mapping information.
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* @num_vectors: The number of MSI/MSI-x vectors that have been allocated.
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* @cb_ida: callback ID allocator to track the callbacks registered.
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* @mic_intr_lock: spinlock to protect the interrupt callback list.
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* @cb_list: Array of callback lists one for each source.
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*/
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struct mic_irq_info {
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int next_avail_src;
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struct msix_entry *msix_entries;
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u32 *mic_msi_map;
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u16 num_vectors;
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struct ida cb_ida;
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spinlock_t mic_intr_lock;
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struct list_head *cb_list;
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};
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/**
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* struct mic_intr_cb - Interrupt callback structure.
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*
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* @func: The callback function
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* @data: Private data of the requester.
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* @cb_id: The callback id. Identifies this callback.
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* @list: list head pointing to the next callback structure.
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*/
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struct mic_intr_cb {
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irqreturn_t (*func) (int irq, void *data);
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void *data;
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int cb_id;
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struct list_head list;
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};
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/**
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* struct mic_irq - opaque pointer used as cookie
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*/
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struct mic_irq;
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/* Forward declaration */
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struct mic_device;
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/**
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* struct mic_hw_intr_ops: MIC HW specific interrupt operations
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* @intr_init: Initialize H/W specific interrupt information.
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* @enable_interrupts: Enable interrupts from the hardware.
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* @disable_interrupts: Disable interrupts from the hardware.
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* @program_msi_to_src_map: Update MSI mapping registers with
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* irq information.
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* @read_msi_to_src_map: Read MSI mapping registers containing
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* irq information.
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*/
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struct mic_hw_intr_ops {
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void (*intr_init)(struct mic_device *mdev);
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void (*enable_interrupts)(struct mic_device *mdev);
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void (*disable_interrupts)(struct mic_device *mdev);
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void (*program_msi_to_src_map) (struct mic_device *mdev,
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int idx, int intr_src, bool set);
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u32 (*read_msi_to_src_map) (struct mic_device *mdev,
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int idx);
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};
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int mic_next_db(struct mic_device *mdev);
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struct mic_irq *mic_request_irq(struct mic_device *mdev,
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irqreturn_t (*func)(int irq, void *data),
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const char *name, void *data, int intr_src,
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enum mic_intr_type type);
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void mic_free_irq(struct mic_device *mdev,
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struct mic_irq *cookie, void *data);
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int mic_setup_interrupts(struct mic_device *mdev, struct pci_dev *pdev);
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void mic_free_interrupts(struct mic_device *mdev, struct pci_dev *pdev);
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void mic_intr_restore(struct mic_device *mdev);
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#endif
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