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kernel_optimize_test/drivers/fpga/dfl.h
Xu Yilun 9ba3a0aa09 fpga: dfl: create a dfl bus type to support DFL devices 
A new bus type "dfl" is introduced for private features which are not
initialized by DFL feature drivers (dfl-fme & dfl-afu drivers). So these
private features could be handled by separate driver modules.

DFL feature drivers (dfl-fme, dfl-port) will create DFL devices on
enumeration. DFL drivers could be registered on this bus to match these
DFL devices. They are matched by dfl type & feature_id.

[mdf@kernel.org: Add missing Documentation part to MAINTAINERS file]

Signed-off-by: Xu Yilun <yilun.xu@intel.com>
Signed-off-by: Wu Hao <hao.wu@intel.com>
Signed-off-by: Matthew Gerlach <matthew.gerlach@linux.intel.com>
Signed-off-by: Russ Weight <russell.h.weight@intel.com>
Reviewed-by: Tom Rix <trix@redhat.com>
Acked-by: Wu Hao <hao.wu@intel.com>
Signed-off-by: Moritz Fischer <mdf@kernel.org>
2020-09-09 20:28:16 -07:00

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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Driver Header File for FPGA Device Feature List (DFL) Support
*
* Copyright (C) 2017-2018 Intel Corporation, Inc.
*
* Authors:
* Kang Luwei <luwei.kang@intel.com>
* Zhang Yi <yi.z.zhang@intel.com>
* Wu Hao <hao.wu@intel.com>
* Xiao Guangrong <guangrong.xiao@linux.intel.com>
*/
#ifndef __FPGA_DFL_H
#define __FPGA_DFL_H
#include <linux/bitfield.h>
#include <linux/cdev.h>
#include <linux/delay.h>
#include <linux/eventfd.h>
#include <linux/fs.h>
#include <linux/interrupt.h>
#include <linux/iopoll.h>
#include <linux/io-64-nonatomic-lo-hi.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/uuid.h>
#include <linux/fpga/fpga-region.h>
/* maximum supported number of ports */
#define MAX_DFL_FPGA_PORT_NUM 4
/* plus one for fme device */
#define MAX_DFL_FEATURE_DEV_NUM (MAX_DFL_FPGA_PORT_NUM + 1)
/* Reserved 0xfe for Header Group Register and 0xff for AFU */
#define FEATURE_ID_FIU_HEADER 0xfe
#define FEATURE_ID_AFU 0xff
#define FME_FEATURE_ID_HEADER FEATURE_ID_FIU_HEADER
#define FME_FEATURE_ID_THERMAL_MGMT 0x1
#define FME_FEATURE_ID_POWER_MGMT 0x2
#define FME_FEATURE_ID_GLOBAL_IPERF 0x3
#define FME_FEATURE_ID_GLOBAL_ERR 0x4
#define FME_FEATURE_ID_PR_MGMT 0x5
#define FME_FEATURE_ID_HSSI 0x6
#define FME_FEATURE_ID_GLOBAL_DPERF 0x7
#define PORT_FEATURE_ID_HEADER FEATURE_ID_FIU_HEADER
#define PORT_FEATURE_ID_AFU FEATURE_ID_AFU
#define PORT_FEATURE_ID_ERROR 0x10
#define PORT_FEATURE_ID_UMSG 0x11
#define PORT_FEATURE_ID_UINT 0x12
#define PORT_FEATURE_ID_STP 0x13
/*
* Device Feature Header Register Set
*
* For FIUs, they all have DFH + GUID + NEXT_AFU as common header registers.
* For AFUs, they have DFH + GUID as common header registers.
* For private features, they only have DFH register as common header.
*/
#define DFH 0x0
#define GUID_L 0x8
#define GUID_H 0x10
#define NEXT_AFU 0x18
#define DFH_SIZE 0x8
/* Device Feature Header Register Bitfield */
#define DFH_ID GENMASK_ULL(11, 0) /* Feature ID */
#define DFH_ID_FIU_FME 0
#define DFH_ID_FIU_PORT 1
#define DFH_REVISION GENMASK_ULL(15, 12) /* Feature revision */
#define DFH_NEXT_HDR_OFST GENMASK_ULL(39, 16) /* Offset to next DFH */
#define DFH_EOL BIT_ULL(40) /* End of list */
#define DFH_TYPE GENMASK_ULL(63, 60) /* Feature type */
#define DFH_TYPE_AFU 1
#define DFH_TYPE_PRIVATE 3
#define DFH_TYPE_FIU 4
/* Next AFU Register Bitfield */
#define NEXT_AFU_NEXT_DFH_OFST GENMASK_ULL(23, 0) /* Offset to next AFU */
/* FME Header Register Set */
#define FME_HDR_DFH DFH
#define FME_HDR_GUID_L GUID_L
#define FME_HDR_GUID_H GUID_H
#define FME_HDR_NEXT_AFU NEXT_AFU
#define FME_HDR_CAP 0x30
#define FME_HDR_PORT_OFST(n) (0x38 + ((n) * 0x8))
#define FME_HDR_BITSTREAM_ID 0x60
#define FME_HDR_BITSTREAM_MD 0x68
/* FME Fab Capability Register Bitfield */
#define FME_CAP_FABRIC_VERID GENMASK_ULL(7, 0) /* Fabric version ID */
#define FME_CAP_SOCKET_ID BIT_ULL(8) /* Socket ID */
#define FME_CAP_PCIE0_LINK_AVL BIT_ULL(12) /* PCIE0 Link */
#define FME_CAP_PCIE1_LINK_AVL BIT_ULL(13) /* PCIE1 Link */
#define FME_CAP_COHR_LINK_AVL BIT_ULL(14) /* Coherent Link */
#define FME_CAP_IOMMU_AVL BIT_ULL(16) /* IOMMU available */
#define FME_CAP_NUM_PORTS GENMASK_ULL(19, 17) /* Number of ports */
#define FME_CAP_ADDR_WIDTH GENMASK_ULL(29, 24) /* Address bus width */
#define FME_CAP_CACHE_SIZE GENMASK_ULL(43, 32) /* cache size in KB */
#define FME_CAP_CACHE_ASSOC GENMASK_ULL(47, 44) /* Associativity */
/* FME Port Offset Register Bitfield */
/* Offset to port device feature header */
#define FME_PORT_OFST_DFH_OFST GENMASK_ULL(23, 0)
/* PCI Bar ID for this port */
#define FME_PORT_OFST_BAR_ID GENMASK_ULL(34, 32)
/* AFU MMIO access permission. 1 - VF, 0 - PF. */
#define FME_PORT_OFST_ACC_CTRL BIT_ULL(55)
#define FME_PORT_OFST_ACC_PF 0
#define FME_PORT_OFST_ACC_VF 1
#define FME_PORT_OFST_IMP BIT_ULL(60)
/* FME Error Capability Register */
#define FME_ERROR_CAP 0x70
/* FME Error Capability Register Bitfield */
#define FME_ERROR_CAP_SUPP_INT BIT_ULL(0) /* Interrupt Support */
#define FME_ERROR_CAP_INT_VECT GENMASK_ULL(12, 1) /* Interrupt vector */
/* PORT Header Register Set */
#define PORT_HDR_DFH DFH
#define PORT_HDR_GUID_L GUID_L
#define PORT_HDR_GUID_H GUID_H
#define PORT_HDR_NEXT_AFU NEXT_AFU
#define PORT_HDR_CAP 0x30
#define PORT_HDR_CTRL 0x38
#define PORT_HDR_STS 0x40
#define PORT_HDR_USRCLK_CMD0 0x50
#define PORT_HDR_USRCLK_CMD1 0x58
#define PORT_HDR_USRCLK_STS0 0x60
#define PORT_HDR_USRCLK_STS1 0x68
/* Port Capability Register Bitfield */
#define PORT_CAP_PORT_NUM GENMASK_ULL(1, 0) /* ID of this port */
#define PORT_CAP_MMIO_SIZE GENMASK_ULL(23, 8) /* MMIO size in KB */
#define PORT_CAP_SUPP_INT_NUM GENMASK_ULL(35, 32) /* Interrupts num */
/* Port Control Register Bitfield */
#define PORT_CTRL_SFTRST BIT_ULL(0) /* Port soft reset */
/* Latency tolerance reporting. '1' >= 40us, '0' < 40us.*/
#define PORT_CTRL_LATENCY BIT_ULL(2)
#define PORT_CTRL_SFTRST_ACK BIT_ULL(4) /* HW ack for reset */
/* Port Status Register Bitfield */
#define PORT_STS_AP2_EVT BIT_ULL(13) /* AP2 event detected */
#define PORT_STS_AP1_EVT BIT_ULL(12) /* AP1 event detected */
#define PORT_STS_PWR_STATE GENMASK_ULL(11, 8) /* AFU power states */
#define PORT_STS_PWR_STATE_NORM 0
#define PORT_STS_PWR_STATE_AP1 1 /* 50% throttling */
#define PORT_STS_PWR_STATE_AP2 2 /* 90% throttling */
#define PORT_STS_PWR_STATE_AP6 6 /* 100% throttling */
/* Port Error Capability Register */
#define PORT_ERROR_CAP 0x38
/* Port Error Capability Register Bitfield */
#define PORT_ERROR_CAP_SUPP_INT BIT_ULL(0) /* Interrupt Support */
#define PORT_ERROR_CAP_INT_VECT GENMASK_ULL(12, 1) /* Interrupt vector */
/* Port Uint Capability Register */
#define PORT_UINT_CAP 0x8
/* Port Uint Capability Register Bitfield */
#define PORT_UINT_CAP_INT_NUM GENMASK_ULL(11, 0) /* Interrupts num */
#define PORT_UINT_CAP_FST_VECT GENMASK_ULL(23, 12) /* First Vector */
/**
* struct dfl_fpga_port_ops - port ops
*
* @name: name of this port ops, to match with port platform device.
* @owner: pointer to the module which owns this port ops.
* @node: node to link port ops to global list.
* @get_id: get port id from hardware.
* @enable_set: enable/disable the port.
*/
struct dfl_fpga_port_ops {
const char *name;
struct module *owner;
struct list_head node;
int (*get_id)(struct platform_device *pdev);
int (*enable_set)(struct platform_device *pdev, bool enable);
};
void dfl_fpga_port_ops_add(struct dfl_fpga_port_ops *ops);
void dfl_fpga_port_ops_del(struct dfl_fpga_port_ops *ops);
struct dfl_fpga_port_ops *dfl_fpga_port_ops_get(struct platform_device *pdev);
void dfl_fpga_port_ops_put(struct dfl_fpga_port_ops *ops);
int dfl_fpga_check_port_id(struct platform_device *pdev, void *pport_id);
/**
* struct dfl_feature_id - dfl private feature id
*
* @id: unique dfl private feature id.
*/
struct dfl_feature_id {
u16 id;
};
/**
* struct dfl_feature_driver - dfl private feature driver
*
* @id_table: id_table for dfl private features supported by this driver.
* @ops: ops of this dfl private feature driver.
*/
struct dfl_feature_driver {
const struct dfl_feature_id *id_table;
const struct dfl_feature_ops *ops;
};
/**
* struct dfl_feature_irq_ctx - dfl private feature interrupt context
*
* @irq: Linux IRQ number of this interrupt.
* @trigger: eventfd context to signal when interrupt happens.
* @name: irq name needed when requesting irq.
*/
struct dfl_feature_irq_ctx {
int irq;
struct eventfd_ctx *trigger;
char *name;
};
/**
* struct dfl_feature - sub feature of the feature devices
*
* @dev: ptr to pdev of the feature device which has the sub feature.
* @id: sub feature id.
* @resource_index: each sub feature has one mmio resource for its registers.
* this index is used to find its mmio resource from the
* feature dev (platform device)'s reources.
* @ioaddr: mapped mmio resource address.
* @irq_ctx: interrupt context list.
* @nr_irqs: number of interrupt contexts.
* @ops: ops of this sub feature.
* @ddev: ptr to the dfl device of this sub feature.
* @priv: priv data of this feature.
*/
struct dfl_feature {
struct platform_device *dev;
u16 id;
int resource_index;
void __iomem *ioaddr;
struct dfl_feature_irq_ctx *irq_ctx;
unsigned int nr_irqs;
const struct dfl_feature_ops *ops;
struct dfl_device *ddev;
void *priv;
};
#define FEATURE_DEV_ID_UNUSED (-1)
/**
* struct dfl_feature_platform_data - platform data for feature devices
*
* @node: node to link feature devs to container device's port_dev_list.
* @lock: mutex to protect platform data.
* @cdev: cdev of feature dev.
* @dev: ptr to platform device linked with this platform data.
* @dfl_cdev: ptr to container device.
* @id: id used for this feature device.
* @disable_count: count for port disable.
* @excl_open: set on feature device exclusive open.
* @open_count: count for feature device open.
* @num: number for sub features.
* @private: ptr to feature dev private data.
* @features: sub features of this feature dev.
*/
struct dfl_feature_platform_data {
struct list_head node;
struct mutex lock;
struct cdev cdev;
struct platform_device *dev;
struct dfl_fpga_cdev *dfl_cdev;
int id;
unsigned int disable_count;
bool excl_open;
int open_count;
void *private;
int num;
struct dfl_feature features[];
};
static inline
int dfl_feature_dev_use_begin(struct dfl_feature_platform_data *pdata,
bool excl)
{
if (pdata->excl_open)
return -EBUSY;
if (excl) {
if (pdata->open_count)
return -EBUSY;
pdata->excl_open = true;
}
pdata->open_count++;
return 0;
}
static inline
void dfl_feature_dev_use_end(struct dfl_feature_platform_data *pdata)
{
pdata->excl_open = false;
if (WARN_ON(pdata->open_count <= 0))
return;
pdata->open_count--;
}
static inline
int dfl_feature_dev_use_count(struct dfl_feature_platform_data *pdata)
{
return pdata->open_count;
}
static inline
void dfl_fpga_pdata_set_private(struct dfl_feature_platform_data *pdata,
void *private)
{
pdata->private = private;
}
static inline
void *dfl_fpga_pdata_get_private(struct dfl_feature_platform_data *pdata)
{
return pdata->private;
}
struct dfl_feature_ops {
int (*init)(struct platform_device *pdev, struct dfl_feature *feature);
void (*uinit)(struct platform_device *pdev,
struct dfl_feature *feature);
long (*ioctl)(struct platform_device *pdev, struct dfl_feature *feature,
unsigned int cmd, unsigned long arg);
};
#define DFL_FPGA_FEATURE_DEV_FME "dfl-fme"
#define DFL_FPGA_FEATURE_DEV_PORT "dfl-port"
void dfl_fpga_dev_feature_uinit(struct platform_device *pdev);
int dfl_fpga_dev_feature_init(struct platform_device *pdev,
struct dfl_feature_driver *feature_drvs);
int dfl_fpga_dev_ops_register(struct platform_device *pdev,
const struct file_operations *fops,
struct module *owner);
void dfl_fpga_dev_ops_unregister(struct platform_device *pdev);
static inline
struct platform_device *dfl_fpga_inode_to_feature_dev(struct inode *inode)
{
struct dfl_feature_platform_data *pdata;
pdata = container_of(inode->i_cdev, struct dfl_feature_platform_data,
cdev);
return pdata->dev;
}
#define dfl_fpga_dev_for_each_feature(pdata, feature) \
for ((feature) = (pdata)->features; \
(feature) < (pdata)->features + (pdata)->num; (feature)++)
static inline
struct dfl_feature *dfl_get_feature_by_id(struct device *dev, u16 id)
{
struct dfl_feature_platform_data *pdata = dev_get_platdata(dev);
struct dfl_feature *feature;
dfl_fpga_dev_for_each_feature(pdata, feature)
if (feature->id == id)
return feature;
return NULL;
}
static inline
void __iomem *dfl_get_feature_ioaddr_by_id(struct device *dev, u16 id)
{
struct dfl_feature *feature = dfl_get_feature_by_id(dev, id);
if (feature && feature->ioaddr)
return feature->ioaddr;
WARN_ON(1);
return NULL;
}
static inline bool is_dfl_feature_present(struct device *dev, u16 id)
{
return !!dfl_get_feature_ioaddr_by_id(dev, id);
}
static inline
struct device *dfl_fpga_pdata_to_parent(struct dfl_feature_platform_data *pdata)
{
return pdata->dev->dev.parent->parent;
}
static inline bool dfl_feature_is_fme(void __iomem *base)
{
u64 v = readq(base + DFH);
return (FIELD_GET(DFH_TYPE, v) == DFH_TYPE_FIU) &&
(FIELD_GET(DFH_ID, v) == DFH_ID_FIU_FME);
}
static inline bool dfl_feature_is_port(void __iomem *base)
{
u64 v = readq(base + DFH);
return (FIELD_GET(DFH_TYPE, v) == DFH_TYPE_FIU) &&
(FIELD_GET(DFH_ID, v) == DFH_ID_FIU_PORT);
}
static inline u8 dfl_feature_revision(void __iomem *base)
{
return (u8)FIELD_GET(DFH_REVISION, readq(base + DFH));
}
/**
* struct dfl_fpga_enum_info - DFL FPGA enumeration information
*
* @dev: parent device.
* @dfls: list of device feature lists.
* @nr_irqs: number of irqs for all feature devices.
* @irq_table: Linux IRQ numbers for all irqs, indexed by hw irq numbers.
*/
struct dfl_fpga_enum_info {
struct device *dev;
struct list_head dfls;
unsigned int nr_irqs;
int *irq_table;
};
/**
* struct dfl_fpga_enum_dfl - DFL FPGA enumeration device feature list info
*
* @start: base address of this device feature list.
* @len: size of this device feature list.
* @node: node in list of device feature lists.
*/
struct dfl_fpga_enum_dfl {
resource_size_t start;
resource_size_t len;
struct list_head node;
};
struct dfl_fpga_enum_info *dfl_fpga_enum_info_alloc(struct device *dev);
int dfl_fpga_enum_info_add_dfl(struct dfl_fpga_enum_info *info,
resource_size_t start, resource_size_t len);
int dfl_fpga_enum_info_add_irq(struct dfl_fpga_enum_info *info,
unsigned int nr_irqs, int *irq_table);
void dfl_fpga_enum_info_free(struct dfl_fpga_enum_info *info);
/**
* struct dfl_fpga_cdev - container device of DFL based FPGA
*
* @parent: parent device of this container device.
* @region: base fpga region.
* @fme_dev: FME feature device under this container device.
* @lock: mutex lock to protect the port device list.
* @port_dev_list: list of all port feature devices under this container device.
* @released_port_num: released port number under this container device.
*/
struct dfl_fpga_cdev {
struct device *parent;
struct fpga_region *region;
struct device *fme_dev;
struct mutex lock;
struct list_head port_dev_list;
int released_port_num;
};
struct dfl_fpga_cdev *
dfl_fpga_feature_devs_enumerate(struct dfl_fpga_enum_info *info);
void dfl_fpga_feature_devs_remove(struct dfl_fpga_cdev *cdev);
/*
* need to drop the device reference with put_device() after use port platform
* device returned by __dfl_fpga_cdev_find_port and dfl_fpga_cdev_find_port
* functions.
*/
struct platform_device *
__dfl_fpga_cdev_find_port(struct dfl_fpga_cdev *cdev, void *data,
int (*match)(struct platform_device *, void *));
static inline struct platform_device *
dfl_fpga_cdev_find_port(struct dfl_fpga_cdev *cdev, void *data,
int (*match)(struct platform_device *, void *))
{
struct platform_device *pdev;
mutex_lock(&cdev->lock);
pdev = __dfl_fpga_cdev_find_port(cdev, data, match);
mutex_unlock(&cdev->lock);
return pdev;
}
int dfl_fpga_cdev_release_port(struct dfl_fpga_cdev *cdev, int port_id);
int dfl_fpga_cdev_assign_port(struct dfl_fpga_cdev *cdev, int port_id);
void dfl_fpga_cdev_config_ports_pf(struct dfl_fpga_cdev *cdev);
int dfl_fpga_cdev_config_ports_vf(struct dfl_fpga_cdev *cdev, int num_vf);
int dfl_fpga_set_irq_triggers(struct dfl_feature *feature, unsigned int start,
unsigned int count, int32_t *fds);
long dfl_feature_ioctl_get_num_irqs(struct platform_device *pdev,
struct dfl_feature *feature,
unsigned long arg);
long dfl_feature_ioctl_set_irq(struct platform_device *pdev,
struct dfl_feature *feature,
unsigned long arg);
/**
* enum dfl_id_type - define the DFL FIU types
*/
enum dfl_id_type {
FME_ID,
PORT_ID,
DFL_ID_MAX,
};
/**
* struct dfl_device_id - dfl device identifier
* @type: contains 4 bits DFL FIU type of the device. See enum dfl_id_type.
* @feature_id: contains 12 bits feature identifier local to its DFL FIU type.
* @driver_data: driver specific data.
*/
struct dfl_device_id {
u8 type;
u16 feature_id;
unsigned long driver_data;
};
/**
* struct dfl_device - represent an dfl device on dfl bus
*
* @dev: generic device interface.
* @id: id of the dfl device.
* @type: type of DFL FIU of the device. See enum dfl_id_type.
* @feature_id: 16 bits feature identifier local to its DFL FIU type.
* @mmio_res: mmio resource of this dfl device.
* @irqs: list of Linux IRQ numbers of this dfl device.
* @num_irqs: number of IRQs supported by this dfl device.
* @cdev: pointer to DFL FPGA container device this dfl device belongs to.
* @id_entry: matched id entry in dfl driver's id table.
*/
struct dfl_device {
struct device dev;
int id;
u8 type;
u16 feature_id;
struct resource mmio_res;
int *irqs;
unsigned int num_irqs;
struct dfl_fpga_cdev *cdev;
const struct dfl_device_id *id_entry;
};
/**
* struct dfl_driver - represent an dfl device driver
*
* @drv: driver model structure.
* @id_table: pointer to table of device IDs the driver is interested in.
* { } member terminated.
* @probe: mandatory callback for device binding.
* @remove: callback for device unbinding.
*/
struct dfl_driver {
struct device_driver drv;
const struct dfl_device_id *id_table;
int (*probe)(struct dfl_device *dfl_dev);
void (*remove)(struct dfl_device *dfl_dev);
};
#define to_dfl_dev(d) container_of(d, struct dfl_device, dev)
#define to_dfl_drv(d) container_of(d, struct dfl_driver, drv)
/*
* use a macro to avoid include chaining to get THIS_MODULE.
*/
#define dfl_driver_register(drv) \
__dfl_driver_register(drv, THIS_MODULE)
int __dfl_driver_register(struct dfl_driver *dfl_drv, struct module *owner);
void dfl_driver_unregister(struct dfl_driver *dfl_drv);
/*
* module_dfl_driver() - Helper macro for drivers that don't do
* anything special in module init/exit. This eliminates a lot of
* boilerplate. Each module may only use this macro once, and
* calling it replaces module_init() and module_exit().
*/
#define module_dfl_driver(__dfl_driver) \
module_driver(__dfl_driver, dfl_driver_register, \
dfl_driver_unregister)
#endif /* __FPGA_DFL_H */
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