diff options
Diffstat (limited to 'drivers/misc/mic/host/mic_intr.h')
| -rw-r--r-- | drivers/misc/mic/host/mic_intr.h | 149 |
1 files changed, 149 insertions, 0 deletions
diff --git a/drivers/misc/mic/host/mic_intr.h b/drivers/misc/mic/host/mic_intr.h new file mode 100644 index 000000000..cce28824d --- /dev/null +++ b/drivers/misc/mic/host/mic_intr.h @@ -0,0 +1,149 @@ +/* + * 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. + * 1 for SCIF + */ +#define MIC_MIN_MSIX 9 +#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 |