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/*
* Intel MIC Platform Software Stack (MPSS)
*
* Copyright(c) 2013 Intel Corporation.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License, version 2, as
* published by the Free Software Foundation.
*
* 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.
*
* The full GNU General Public License is included in this distribution in
* the file called "COPYING".
*
* Intel MIC Host driver.
*
*/
#ifndef _MIC_INTR_H_
#define _MIC_INTR_H_
#include <linux/bitops.h>
#include <linux/interrupt.h>
/*
* The minimum number of msix vectors required for normal operation.
* 3 for virtio network, console and block devices.
* 1 for card shutdown notifications.
* 4 for host owned DMA channels.
*/
#define MIC_MIN_MSIX 8
#define MIC_NUM_OFFSETS 32
/**
* mic_intr_source - The type of source that will generate
* the interrupt.The number of types needs to be in sync with
* MIC_NUM_INTR_TYPES
*
* MIC_INTR_DB: The source is a doorbell
* MIC_INTR_DMA: The source is a DMA channel
* MIC_INTR_ERR: The source is an error interrupt e.g. SBOX ERR
* MIC_NUM_INTR_TYPES: Total number of interrupt sources.
*/
enum mic_intr_type {
MIC_INTR_DB = 0,
MIC_INTR_DMA,
MIC_INTR_ERR,
MIC_NUM_INTR_TYPES
};
/**
* struct mic_intr_info - Contains h/w specific interrupt sources
* information.
*
* @intr_start_idx: Contains the starting indexes of the
* interrupt types.
* @intr_len: Contains the length of the interrupt types.
*/
struct mic_intr_info {
u16 intr_start_idx[MIC_NUM_INTR_TYPES];
u16 intr_len[MIC_NUM_INTR_TYPES];
};
/**
* struct mic_irq_info - OS specific irq information
*
* @next_avail_src: next available doorbell that can be assigned.
* @msix_entries: msix entries allocated while setting up MSI-x
* @mic_msi_map: The MSI/MSI-x mapping information.
* @num_vectors: The number of MSI/MSI-x vectors that have been allocated.
* @cb_ida: callback ID allocator to track the callbacks registered.
* @mic_intr_lock: spinlock to protect the interrupt callback list.
* @mic_thread_lock: spinlock to protect the thread callback list.
* This lock is used to protect against thread_fn while
* mic_intr_lock is used to protect against interrupt handler.
* @cb_list: Array of callback lists one for each source.
* @mask: Mask used by the main thread fn to call the underlying thread fns.
*/
struct mic_irq_info {
int next_avail_src;
struct msix_entry *msix_entries;
u32 *mic_msi_map;
u16 num_vectors;
struct ida cb_ida;
spinlock_t mic_intr_lock;
spinlock_t mic_thread_lock;
struct list_head *cb_list;
unsigned long mask;
};
/**
* struct mic_intr_cb - Interrupt callback structure.
*
* @handler: The callback function
* @thread_fn: The thread_fn.
* @data: Private data of the requester.
* @cb_id: The callback id. Identifies this callback.
* @list: list head pointing to the next callback structure.
*/
struct mic_intr_cb {
irq_handler_t handler;
irq_handler_t thread_fn;
void *data;
int cb_id;
struct list_head list;
};
/**
* struct mic_irq - opaque pointer used as cookie
*/
struct mic_irq;
/* Forward declaration */
struct mic_device;
/**
* struct mic_hw_intr_ops: MIC HW specific interrupt operations
* @intr_init: Initialize H/W specific interrupt information.
* @enable_interrupts: Enable interrupts from the hardware.
* @disable_interrupts: Disable interrupts from the hardware.
* @program_msi_to_src_map: Update MSI mapping registers with
* irq information.
* @read_msi_to_src_map: Read MSI mapping registers containing
* irq information.
*/
struct mic_hw_intr_ops {
void (*intr_init)(struct mic_device *mdev);
void (*enable_interrupts)(struct mic_device *mdev);
void (*disable_interrupts)(struct mic_device *mdev);
void (*program_msi_to_src_map) (struct mic_device *mdev,
int idx, int intr_src, bool set);
u32 (*read_msi_to_src_map) (struct mic_device *mdev,
int idx);
};
int mic_next_db(struct mic_device *mdev);
struct mic_irq *
mic_request_threaded_irq(struct mic_device *mdev,
irq_handler_t handler, irq_handler_t thread_fn,
const char *name, void *data, int intr_src,
enum mic_intr_type type);
void mic_free_irq(struct mic_device *mdev,
struct mic_irq *cookie, void *data);
int mic_setup_interrupts(struct mic_device *mdev, struct pci_dev *pdev);
void mic_free_interrupts(struct mic_device *mdev, struct pci_dev *pdev);
void mic_intr_restore(struct mic_device *mdev);
#endif
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