/* 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/dfl.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/mod_devicetable.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 0 xfe
#define FEATURE_ID_AFU 0 xff
#define FME_FEATURE_ID_HEADER FEATURE_ID_FIU_HEADER
#define FME_FEATURE_ID_THERMAL_MGMT 0 x1
#define FME_FEATURE_ID_POWER_MGMT 0 x2
#define FME_FEATURE_ID_GLOBAL_IPERF 0 x3
#define FME_FEATURE_ID_GLOBAL_ERR 0 x4
#define FME_FEATURE_ID_PR_MGMT 0 x5
#define FME_FEATURE_ID_HSSI 0 x6
#define FME_FEATURE_ID_GLOBAL_DPERF 0 x7
#define PORT_FEATURE_ID_HEADER FEATURE_ID_FIU_HEADER
#define PORT_FEATURE_ID_AFU FEATURE_ID_AFU
#define PORT_FEATURE_ID_ERROR 0 x10
#define PORT_FEATURE_ID_UMSG 0 x11
#define PORT_FEATURE_ID_UINT 0 x12
#define PORT_FEATURE_ID_STP 0 x13
/*
* 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 0 x0
#define GUID_L 0 x8
#define GUID_H 0 x10
#define NEXT_AFU 0 x18
#define DFH_SIZE 0 x8
/* 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_VERSION GENMASK_ULL(59 , 52 ) /* DFH version */
#define DFH_TYPE GENMASK_ULL(63 , 60 ) /* Feature type */
#define DFH_TYPE_AFU 1
#define DFH_TYPE_PRIVATE 3
#define DFH_TYPE_FIU 4
/*
* DFHv1 Register Offset definitons
* In DHFv1 , DFH + GUID + CSR_START + CSR_SIZE_GROUP + PARAM_HDR + PARAM_DATA
* as common header registers
*/
#define DFHv1_CSR_ADDR 0 x18 /* CSR Register start address */
#define DFHv1_CSR_SIZE_GRP 0 x20 /* Size of Reg Block and Group/tag */
#define DFHv1_PARAM_HDR 0 x28 /* Optional First Param header */
/*
* CSR Rel Bit , 1 ' b0 = relative ( offset from feature DFH start ) ,
* 1 ' b1 = absolute ( ARM or other non - PCIe use )
*/
#define DFHv1_CSR_ADDR_REL BIT_ULL(0 )
/* CSR Header Register Bit Definitions */
#define DFHv1_CSR_ADDR_MASK GENMASK_ULL(63 , 1 ) /* 63:1 of CSR address */
/* CSR SIZE Goup Register Bit Definitions */
#define DFHv1_CSR_SIZE_GRP_INSTANCE_ID GENMASK_ULL(15 , 0 ) /* Enumeration instantiated IP */
#define DFHv1_CSR_SIZE_GRP_GROUPING_ID GENMASK_ULL(30 , 16 ) /* Group Features/interfaces */
#define DFHv1_CSR_SIZE_GRP_HAS_PARAMS BIT_ULL(31 ) /* Presence of Parameters */
#define DFHv1_CSR_SIZE_GRP_SIZE GENMASK_ULL(63 , 32 ) /* Size of CSR Block in bytes */
/* PARAM Header Register Bit Definitions */
#define DFHv1_PARAM_HDR_ID GENMASK_ULL(15 , 0 ) /* Id of this Param */
#define DFHv1_PARAM_HDR_VER GENMASK_ULL(31 , 16 ) /* Version Param */
#define DFHv1_PARAM_HDR_NEXT_OFFSET GENMASK_ULL(63 , 35 ) /* Offset of next Param */
#define DFHv1_PARAM_HDR_NEXT_EOP BIT_ULL(32 )
#define DFHv1_PARAM_DATA 0 x08 /* Offset of Param data from Param header */
#define DFHv1_PARAM_ID_MSI_X 0 x1
#define DFHv1_PARAM_MSI_X_NUMV GENMASK_ULL(63 , 32 )
#define DFHv1_PARAM_MSI_X_STARTV GENMASK_ULL(31 , 0 )
/* 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 0 x30
#define FME_HDR_PORT_OFST(n) (0 x38 + ((n) * 0 x8))
#define FME_PORT_OFST_BAR_SKIP 7
#define FME_HDR_BITSTREAM_ID 0 x60
#define FME_HDR_BITSTREAM_MD 0 x68
/* 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 0 x70
/* 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 0 x30
#define PORT_HDR_CTRL 0 x38
#define PORT_HDR_STS 0 x40
#define PORT_HDR_USRCLK_CMD0 0 x50
#define PORT_HDR_USRCLK_CMD1 0 x58
#define PORT_HDR_USRCLK_STS0 0 x60
#define PORT_HDR_USRCLK_STS1 0 x68
/* 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 0 x38
/* 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 0 x8
/* 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_feature_dev_data;
/**
* 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 dfl_feature_dev_data *fdata);
int (*enable_set)(struct dfl_feature_dev_data *fdata, 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 dfl_feature_dev_data *fdata);
void dfl_fpga_port_ops_put(struct dfl_fpga_port_ops *ops);
int dfl_fpga_check_port_id(struct dfl_feature_dev_data *fdata, 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 .
* @ revision : revision of this sub feature .
* @ 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 resources .
* @ 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 .
* @ dfh_version : version of the DFH
* @ param_size : size of dfh parameters
* @ params : point to memory copy of dfh parameters
*/
struct dfl_feature {
struct platform_device *dev;
u16 id;
u8 revision;
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;
u8 dfh_version;
unsigned int param_size;
void *params;
};
#define FEATURE_DEV_ID_UNUSED (-1 )
/**
* struct dfl_feature_dev_data - dfl enumeration data for dfl feature dev .
*
* @ node : node to link the data structure to container device ' s port_dev_list .
* @ lock : mutex to protect feature dev data .
* @ dev : ptr to the feature ' s platform device linked with this structure .
* @ type : type of DFL FIU for the feature dev . See enum dfl_id_type .
* @ pdev_id : platform device id for the feature dev .
* @ pdev_name : platform device name for the feature dev .
* @ dfl_cdev : ptr to container device .
* @ id : id used for the 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 for the feature dev .
* @ resource_num : number of resources for the feature dev .
* @ resources : resources for the feature dev .
*/
struct dfl_feature_dev_data {
struct list_head node;
struct mutex lock;
struct platform_device *dev;
enum dfl_id_type type;
int pdev_id;
const char *pdev_name;
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;
int resource_num;
struct resource *resources;
};
/**
* struct dfl_feature_platform_data - platform data for feature devices
*
* @ cdev : cdev of feature dev .
* @ fdata : dfl enumeration data for the dfl feature device .
*/
struct dfl_feature_platform_data {
struct cdev cdev;
struct dfl_feature_dev_data *fdata;
};
static inline
int dfl_feature_dev_use_begin(struct dfl_feature_dev_data *fdata,
bool excl)
{
if (fdata->excl_open)
return -EBUSY;
if (excl) {
if (fdata->open_count)
return -EBUSY;
fdata->excl_open = true ;
}
fdata->open_count++;
return 0 ;
}
static inline
void dfl_feature_dev_use_end(struct dfl_feature_dev_data *fdata)
{
fdata->excl_open = false ;
if (WARN_ON(fdata->open_count <= 0 ))
return ;
fdata->open_count--;
}
static inline
int dfl_feature_dev_use_count(struct dfl_feature_dev_data *fdata)
{
return fdata->open_count;
}
static inline
void dfl_fpga_fdata_set_private(struct dfl_feature_dev_data *fdata,
void *private )
{
fdata->private = private ;
}
static inline
void *dfl_fpga_fdata_get_private(struct dfl_feature_dev_data *fdata)
{
return fdata->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 dfl_feature_dev_data *
dfl_fpga_inode_to_feature_dev_data(struct inode *inode)
{
struct dfl_feature_platform_data *pdata;
pdata = container_of(inode->i_cdev, struct dfl_feature_platform_data,
cdev);
return pdata->fdata;
}
#define dfl_fpga_dev_for_each_feature(fdata, feature) \
for ((feature) = (fdata)->features; \
(feature) < (fdata)->features + (fdata)->num; (feature)++)
static inline struct dfl_feature *
dfl_get_feature_by_id(struct dfl_feature_dev_data *fdata, u16 id)
{
struct dfl_feature *feature;
dfl_fpga_dev_for_each_feature(fdata, feature)
if (feature->id == id)
return feature;
return NULL;
}
static inline void __iomem *
dfl_get_feature_ioaddr_by_id(struct dfl_feature_dev_data *fdata, u16 id)
{
struct dfl_feature *feature = dfl_get_feature_by_id(fdata, id);
if (feature && feature->ioaddr)
return feature->ioaddr;
WARN_ON(1 );
return NULL;
}
static inline struct dfl_feature_dev_data *
to_dfl_feature_dev_data(struct device *dev)
{
struct dfl_feature_platform_data *pdata = dev_get_platdata(dev);
return pdata->fdata;
}
static inline
struct device *dfl_fpga_fdata_to_parent(struct dfl_feature_dev_data *fdata)
{
return fdata->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);
struct dfl_feature_dev_data *
__dfl_fpga_cdev_find_port_data(struct dfl_fpga_cdev *cdev, void *data,
int (*match)(struct dfl_feature_dev_data *, void *));
static inline struct dfl_feature_dev_data *
dfl_fpga_cdev_find_port_data(struct dfl_fpga_cdev *cdev, void *data,
int (*match)(struct dfl_feature_dev_data *, void *))
{
struct dfl_feature_dev_data *fdata;
mutex_lock(&cdev->lock);
fdata = __dfl_fpga_cdev_find_port_data(cdev, data, match);
mutex_unlock(&cdev->lock);
return fdata;
}
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);
#endif /* __FPGA_DFL_H */
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