forked from Minki/linux
d4ef098e4c
This patch adds a dma device on the mic virtual bus and uses this dmaengine to transfer data for virtio devices Reviewed-by: Nikhil Rao <nikhil.rao@intel.com> Signed-off-by: Sudeep Dutt <sudeep.dutt@intel.com> Signed-off-by: Ashutosh Dixit <ashutosh.dixit@intel.com> Signed-off-by: Siva Yerramreddy <yshivakrishna@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
232 lines
7.3 KiB
C
232 lines
7.3 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_DEVICE_H_
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#define _MIC_DEVICE_H_
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#include <linux/cdev.h>
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#include <linux/idr.h>
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#include <linux/notifier.h>
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#include <linux/irqreturn.h>
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#include <linux/dmaengine.h>
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#include <linux/mic_bus.h>
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#include "mic_intr.h"
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/* The maximum number of MIC devices supported in a single host system. */
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#define MIC_MAX_NUM_DEVS 256
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/**
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* enum mic_hw_family - The hardware family to which a device belongs.
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*/
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enum mic_hw_family {
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MIC_FAMILY_X100 = 0,
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MIC_FAMILY_UNKNOWN
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};
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/**
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* enum mic_stepping - MIC stepping ids.
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*/
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enum mic_stepping {
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MIC_A0_STEP = 0x0,
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MIC_B0_STEP = 0x10,
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MIC_B1_STEP = 0x11,
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MIC_C0_STEP = 0x20,
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};
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/**
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* struct mic_device - MIC device information for each card.
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*
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* @mmio: MMIO bar information.
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* @aper: Aperture bar information.
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* @family: The MIC family to which this device belongs.
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* @ops: MIC HW specific operations.
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* @id: The unique device id for this MIC device.
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* @stepping: Stepping ID.
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* @attr_group: Pointer to list of sysfs attribute groups.
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* @sdev: Device for sysfs entries.
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* @mic_mutex: Mutex for synchronizing access to mic_device.
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* @intr_ops: HW specific interrupt operations.
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* @smpt_ops: Hardware specific SMPT operations.
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* @smpt: MIC SMPT information.
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* @intr_info: H/W specific interrupt information.
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* @irq_info: The OS specific irq information
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* @dbg_dir: debugfs directory of this MIC device.
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* @cmdline: Kernel command line.
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* @firmware: Firmware file name.
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* @ramdisk: Ramdisk file name.
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* @bootmode: Boot mode i.e. "linux" or "elf" for flash updates.
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* @bootaddr: MIC boot address.
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* @reset_trigger_work: Work for triggering reset requests.
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* @shutdown_work: Work for handling shutdown interrupts.
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* @state: MIC state.
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* @shutdown_status: MIC status reported by card for shutdown/crashes.
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* @state_sysfs: Sysfs dirent for notifying ring 3 about MIC state changes.
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* @reset_wait: Waitqueue for sleeping while reset completes.
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* @log_buf_addr: Log buffer address for MIC.
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* @log_buf_len: Log buffer length address for MIC.
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* @dp: virtio device page
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* @dp_dma_addr: virtio device page DMA address.
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* @shutdown_db: shutdown doorbell.
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* @shutdown_cookie: shutdown cookie.
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* @cdev: Character device for MIC.
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* @vdev_list: list of virtio devices.
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* @pm_notifier: Handles PM notifications from the OS.
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* @dma_mbdev: MIC BUS DMA device.
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* @dma_ch: DMA channel reserved by this driver for use by virtio devices.
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*/
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struct mic_device {
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struct mic_mw mmio;
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struct mic_mw aper;
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enum mic_hw_family family;
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struct mic_hw_ops *ops;
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int id;
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enum mic_stepping stepping;
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const struct attribute_group **attr_group;
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struct device *sdev;
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struct mutex mic_mutex;
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struct mic_hw_intr_ops *intr_ops;
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struct mic_smpt_ops *smpt_ops;
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struct mic_smpt_info *smpt;
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struct mic_intr_info *intr_info;
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struct mic_irq_info irq_info;
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struct dentry *dbg_dir;
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char *cmdline;
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char *firmware;
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char *ramdisk;
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char *bootmode;
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u32 bootaddr;
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struct work_struct reset_trigger_work;
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struct work_struct shutdown_work;
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u8 state;
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u8 shutdown_status;
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struct kernfs_node *state_sysfs;
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struct completion reset_wait;
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void *log_buf_addr;
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int *log_buf_len;
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void *dp;
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dma_addr_t dp_dma_addr;
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int shutdown_db;
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struct mic_irq *shutdown_cookie;
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struct cdev cdev;
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struct list_head vdev_list;
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struct notifier_block pm_notifier;
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struct mbus_device *dma_mbdev;
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struct dma_chan *dma_ch;
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};
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/**
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* struct mic_hw_ops - MIC HW specific operations.
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* @aper_bar: Aperture bar resource number.
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* @mmio_bar: MMIO bar resource number.
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* @read_spad: Read from scratch pad register.
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* @write_spad: Write to scratch pad register.
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* @send_intr: Send an interrupt for a particular doorbell on the card.
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* @ack_interrupt: Hardware specific operations to ack the h/w on
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* receipt of an interrupt.
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* @intr_workarounds: Hardware specific workarounds needed after
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* handling an interrupt.
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* @reset: Reset the remote processor.
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* @reset_fw_ready: Reset firmware ready field.
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* @is_fw_ready: Check if firmware is ready for OS download.
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* @send_firmware_intr: Send an interrupt to the card firmware.
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* @load_mic_fw: Load firmware segments required to boot the card
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* into card memory. This includes the kernel, command line, ramdisk etc.
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* @get_postcode: Get post code status from firmware.
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* @dma_filter: DMA filter function to be used.
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*/
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struct mic_hw_ops {
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u8 aper_bar;
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u8 mmio_bar;
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u32 (*read_spad)(struct mic_device *mdev, unsigned int idx);
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void (*write_spad)(struct mic_device *mdev, unsigned int idx, u32 val);
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void (*send_intr)(struct mic_device *mdev, int doorbell);
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u32 (*ack_interrupt)(struct mic_device *mdev);
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void (*intr_workarounds)(struct mic_device *mdev);
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void (*reset)(struct mic_device *mdev);
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void (*reset_fw_ready)(struct mic_device *mdev);
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bool (*is_fw_ready)(struct mic_device *mdev);
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void (*send_firmware_intr)(struct mic_device *mdev);
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int (*load_mic_fw)(struct mic_device *mdev, const char *buf);
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u32 (*get_postcode)(struct mic_device *mdev);
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bool (*dma_filter)(struct dma_chan *chan, void *param);
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};
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/**
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* mic_mmio_read - read from an MMIO register.
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* @mw: MMIO register base virtual address.
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* @offset: register offset.
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*
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* RETURNS: register value.
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*/
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static inline u32 mic_mmio_read(struct mic_mw *mw, u32 offset)
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{
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return ioread32(mw->va + offset);
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}
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/**
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* mic_mmio_write - write to an MMIO register.
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* @mw: MMIO register base virtual address.
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* @val: the data value to put into the register
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* @offset: register offset.
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*
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* RETURNS: none.
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*/
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static inline void
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mic_mmio_write(struct mic_mw *mw, u32 val, u32 offset)
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{
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iowrite32(val, mw->va + offset);
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}
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static inline struct dma_chan *mic_request_dma_chan(struct mic_device *mdev)
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{
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dma_cap_mask_t mask;
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struct dma_chan *chan;
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dma_cap_zero(mask);
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dma_cap_set(DMA_MEMCPY, mask);
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chan = dma_request_channel(mask, mdev->ops->dma_filter,
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mdev->sdev->parent);
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if (chan)
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return chan;
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dev_err(mdev->sdev->parent, "%s %d unable to acquire channel\n",
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__func__, __LINE__);
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return NULL;
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}
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void mic_sysfs_init(struct mic_device *mdev);
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int mic_start(struct mic_device *mdev, const char *buf);
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void mic_stop(struct mic_device *mdev, bool force);
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void mic_shutdown(struct mic_device *mdev);
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void mic_reset_delayed_work(struct work_struct *work);
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void mic_reset_trigger_work(struct work_struct *work);
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void mic_shutdown_work(struct work_struct *work);
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void mic_bootparam_init(struct mic_device *mdev);
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void mic_set_state(struct mic_device *mdev, u8 state);
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void mic_set_shutdown_status(struct mic_device *mdev, u8 status);
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void mic_create_debug_dir(struct mic_device *dev);
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void mic_delete_debug_dir(struct mic_device *dev);
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void __init mic_init_debugfs(void);
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void mic_exit_debugfs(void);
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void mic_prepare_suspend(struct mic_device *mdev);
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void mic_complete_resume(struct mic_device *mdev);
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void mic_suspend(struct mic_device *mdev);
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#endif
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