/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_X86_RESCTRL_INTERNAL_H
#define _ASM_X86_RESCTRL_INTERNAL_H

#include <linux/sched.h>
#include <linux/kernfs.h>
#include <linux/fs_context.h>
#include <linux/jump_label.h>

#define MSR_IA32_L3_QOS_CFG             0xc81
#define MSR_IA32_L2_QOS_CFG             0xc82
#define MSR_IA32_L3_CBM_BASE            0xc90
#define MSR_IA32_L2_CBM_BASE            0xd10
#define MSR_IA32_MBA_THRTL_BASE         0xd50
#define MSR_IA32_MBA_BW_BASE            0xc0000200

#define MSR_IA32_QM_CTR                 0x0c8e
#define MSR_IA32_QM_EVTSEL              0x0c8d

#define L3_QOS_CDP_ENABLE               0x01ULL

#define L2_QOS_CDP_ENABLE               0x01ULL

/*
 * Event IDs are used to program IA32_QM_EVTSEL before reading event
 * counter from IA32_QM_CTR
 */
#define QOS_L3_OCCUP_EVENT_ID           0x01
#define QOS_L3_MBM_TOTAL_EVENT_ID       0x02
#define QOS_L3_MBM_LOCAL_EVENT_ID       0x03

#define CQM_LIMBOCHECK_INTERVAL 1000

#define MBM_CNTR_WIDTH_BASE             24
#define MBM_OVERFLOW_INTERVAL           1000
#define MAX_MBA_BW                      100u
#define MBA_IS_LINEAR                   0x4
#define MBA_MAX_MBPS                    U32_MAX
#define MAX_MBA_BW_AMD                  0x800
#define MBM_CNTR_WIDTH_OFFSET_AMD       20

#define RMID_VAL_ERROR                  BIT_ULL(63)
#define RMID_VAL_UNAVAIL                BIT_ULL(62)
/*
 * With the above fields in use 62 bits remain in MSR_IA32_QM_CTR for
 * data to be returned. The counter width is discovered from the hardware
 * as an offset from MBM_CNTR_WIDTH_BASE.
 */
#define MBM_CNTR_WIDTH_OFFSET_MAX (62 - MBM_CNTR_WIDTH_BASE)


struct rdt_fs_context {
        struct kernfs_fs_context        kfc;
        bool                            enable_cdpl2;
        bool                            enable_cdpl3;
        bool                            enable_mba_mbps;
};

static inline struct rdt_fs_context *rdt_fc2context(struct fs_context *fc)
{
        struct kernfs_fs_context *kfc = fc->fs_private;

        return container_of(kfc, struct rdt_fs_context, kfc);
}

DECLARE_STATIC_KEY_FALSE(rdt_enable_key);
DECLARE_STATIC_KEY_FALSE(rdt_mon_enable_key);

/**
 * struct mon_evt - Entry in the event list of a resource
 * @evtid:              event id
 * @name:               name of the event
 */
struct mon_evt {
        u32                     evtid;
        char                    *name;
        struct list_head        list;
};

/**
 * struct mon_data_bits - Monitoring details for each event file
 * @rid:               Resource id associated with the event file.
 * @evtid:             Event id associated with the event file
 * @domid:             The domain to which the event file belongs
 */
union mon_data_bits {
        void *priv;
        struct {
                unsigned int rid        : 10;
                unsigned int evtid      : 8;
                unsigned int domid      : 14;
        } u;
};

struct rmid_read {
        struct rdtgroup         *rgrp;
        struct rdt_resource     *r;
        struct rdt_domain       *d;
        int                     evtid;
        bool                    first;
        u64                     val;
};

extern unsigned int resctrl_cqm_threshold;
extern bool rdt_alloc_capable;
extern bool rdt_mon_capable;
extern unsigned int rdt_mon_features;

enum rdt_group_type {
        RDTCTRL_GROUP = 0,
        RDTMON_GROUP,
        RDT_NUM_GROUP,
};

/**
 * enum rdtgrp_mode - Mode of a RDT resource group
 * @RDT_MODE_SHAREABLE: This resource group allows sharing of its allocations
 * @RDT_MODE_EXCLUSIVE: No sharing of this resource group's allocations allowed
 * @RDT_MODE_PSEUDO_LOCKSETUP: Resource group will be used for Pseudo-Locking
 * @RDT_MODE_PSEUDO_LOCKED: No sharing of this resource group's allocations
 *                          allowed AND the allocations are Cache Pseudo-Locked
 *
 * The mode of a resource group enables control over the allowed overlap
 * between allocations associated with different resource groups (classes
 * of service). User is able to modify the mode of a resource group by
 * writing to the "mode" resctrl file associated with the resource group.
 *
 * The "shareable", "exclusive", and "pseudo-locksetup" modes are set by
 * writing the appropriate text to the "mode" file. A resource group enters
 * "pseudo-locked" mode after the schemata is written while the resource
 * group is in "pseudo-locksetup" mode.
 */
enum rdtgrp_mode {
        RDT_MODE_SHAREABLE = 0,
        RDT_MODE_EXCLUSIVE,
        RDT_MODE_PSEUDO_LOCKSETUP,
        RDT_MODE_PSEUDO_LOCKED,

        /* Must be last */
        RDT_NUM_MODES,
};

/**
 * struct mongroup - store mon group's data in resctrl fs.
 * @mon_data_kn         kernlfs node for the mon_data directory
 * @parent:                     parent rdtgrp
 * @crdtgrp_list:               child rdtgroup node list
 * @rmid:                       rmid for this rdtgroup
 */
struct mongroup {
        struct kernfs_node      *mon_data_kn;
        struct rdtgroup         *parent;
        struct list_head        crdtgrp_list;
        u32                     rmid;
};

/**
 * struct pseudo_lock_region - pseudo-lock region information
 * @r:                  RDT resource to which this pseudo-locked region
 *                      belongs
 * @d:                  RDT domain to which this pseudo-locked region
 *                      belongs
 * @cbm:                bitmask of the pseudo-locked region
 * @lock_thread_wq:     waitqueue used to wait on the pseudo-locking thread
 *                      completion
 * @thread_done:        variable used by waitqueue to test if pseudo-locking
 *                      thread completed
 * @cpu:                core associated with the cache on which the setup code
 *                      will be run
 * @line_size:          size of the cache lines
 * @size:               size of pseudo-locked region in bytes
 * @kmem:               the kernel memory associated with pseudo-locked region
 * @minor:              minor number of character device associated with this
 *                      region
 * @debugfs_dir:        pointer to this region's directory in the debugfs
 *                      filesystem
 * @pm_reqs:            Power management QoS requests related to this region
 */
struct pseudo_lock_region {
        struct rdt_resource     *r;
        struct rdt_domain       *d;
        u32                     cbm;
        wait_queue_head_t       lock_thread_wq;
        int                     thread_done;
        int                     cpu;
        unsigned int            line_size;
        unsigned int            size;
        void                    *kmem;
        unsigned int            minor;
        struct dentry           *debugfs_dir;
        struct list_head        pm_reqs;
};

/**
 * struct rdtgroup - store rdtgroup's data in resctrl file system.
 * @kn:                         kernfs node
 * @rdtgroup_list:              linked list for all rdtgroups
 * @closid:                     closid for this rdtgroup
 * @cpu_mask:                   CPUs assigned to this rdtgroup
 * @flags:                      status bits
 * @waitcount:                  how many cpus expect to find this
 *                              group when they acquire rdtgroup_mutex
 * @type:                       indicates type of this rdtgroup - either
 *                              monitor only or ctrl_mon group
 * @mon:                        mongroup related data
 * @mode:                       mode of resource group
 * @plr:                        pseudo-locked region
 */
struct rdtgroup {
        struct kernfs_node              *kn;
        struct list_head                rdtgroup_list;
        u32                             closid;
        struct cpumask                  cpu_mask;
        int                             flags;
        atomic_t                        waitcount;
        enum rdt_group_type             type;
        struct mongroup                 mon;
        enum rdtgrp_mode                mode;
        struct pseudo_lock_region       *plr;
};

/* rdtgroup.flags */
#define RDT_DELETED             1

/* rftype.flags */
#define RFTYPE_FLAGS_CPUS_LIST  1

/*
 * Define the file type flags for base and info directories.
 */
#define RFTYPE_INFO                     BIT(0)
#define RFTYPE_BASE                     BIT(1)
#define RF_CTRLSHIFT                    4
#define RF_MONSHIFT                     5
#define RF_TOPSHIFT                     6
#define RFTYPE_CTRL                     BIT(RF_CTRLSHIFT)
#define RFTYPE_MON                      BIT(RF_MONSHIFT)
#define RFTYPE_TOP                      BIT(RF_TOPSHIFT)
#define RFTYPE_RES_CACHE                BIT(8)
#define RFTYPE_RES_MB                   BIT(9)
#define RF_CTRL_INFO                    (RFTYPE_INFO | RFTYPE_CTRL)
#define RF_MON_INFO                     (RFTYPE_INFO | RFTYPE_MON)
#define RF_TOP_INFO                     (RFTYPE_INFO | RFTYPE_TOP)
#define RF_CTRL_BASE                    (RFTYPE_BASE | RFTYPE_CTRL)

/* List of all resource groups */
extern struct list_head rdt_all_groups;

extern int max_name_width, max_data_width;

int __init rdtgroup_init(void);
void __exit rdtgroup_exit(void);

/**
 * struct rftype - describe each file in the resctrl file system
 * @name:       File name
 * @mode:       Access mode
 * @kf_ops:     File operations
 * @flags:      File specific RFTYPE_FLAGS_* flags
 * @fflags:     File specific RF_* or RFTYPE_* flags
 * @seq_show:   Show content of the file
 * @write:      Write to the file
 */
struct rftype {
        char                    *name;
        umode_t                 mode;
        struct kernfs_ops       *kf_ops;
        unsigned long           flags;
        unsigned long           fflags;

        int (*seq_show)(struct kernfs_open_file *of,
                        struct seq_file *sf, void *v);
        /*
         * write() is the generic write callback which maps directly to
         * kernfs write operation and overrides all other operations.
         * Maximum write size is determined by ->max_write_len.
         */
        ssize_t (*write)(struct kernfs_open_file *of,
                         char *buf, size_t nbytes, loff_t off);
};

/**
 * struct mbm_state - status for each MBM counter in each domain
 * @chunks:     Total data moved (multiply by rdt_group.mon_scale to get bytes)
 * @prev_msr    Value of IA32_QM_CTR for this RMID last time we read it
 * @chunks_bw   Total local data moved. Used for bandwidth calculation
 * @prev_bw_msr:Value of previous IA32_QM_CTR for bandwidth counting
 * @prev_bw     The most recent bandwidth in MBps
 * @delta_bw    Difference between the current and previous bandwidth
 * @delta_comp  Indicates whether to compute the delta_bw
 */
struct mbm_state {
        u64     chunks;
        u64     prev_msr;
        u64     chunks_bw;
        u64     prev_bw_msr;
        u32     prev_bw;
        u32     delta_bw;
        bool    delta_comp;
};

/**
 * struct rdt_domain - group of cpus sharing an RDT resource
 * @list:       all instances of this resource
 * @id:         unique id for this instance
 * @cpu_mask:   which cpus share this resource
 * @rmid_busy_llc:
 *              bitmap of which limbo RMIDs are above threshold
 * @mbm_total:  saved state for MBM total bandwidth
 * @mbm_local:  saved state for MBM local bandwidth
 * @mbm_over:   worker to periodically read MBM h/w counters
 * @cqm_limbo:  worker to periodically read CQM h/w counters
 * @mbm_work_cpu:
 *              worker cpu for MBM h/w counters
 * @cqm_work_cpu:
 *              worker cpu for CQM h/w counters
 * @ctrl_val:   array of cache or mem ctrl values (indexed by CLOSID)
 * @mbps_val:   When mba_sc is enabled, this holds the bandwidth in MBps
 * @new_ctrl:   new ctrl value to be loaded
 * @have_new_ctrl: did user provide new_ctrl for this domain
 * @plr:        pseudo-locked region (if any) associated with domain
 */
struct rdt_domain {
        struct list_head                list;
        int                             id;
        struct cpumask                  cpu_mask;
        unsigned long                   *rmid_busy_llc;
        struct mbm_state                *mbm_total;
        struct mbm_state                *mbm_local;
        struct delayed_work             mbm_over;
        struct delayed_work             cqm_limbo;
        int                             mbm_work_cpu;
        int                             cqm_work_cpu;
        u32                             *ctrl_val;
        u32                             *mbps_val;
        u32                             new_ctrl;
        bool                            have_new_ctrl;
        struct pseudo_lock_region       *plr;
};

/**
 * struct msr_param - set a range of MSRs from a domain
 * @res:       The resource to use
 * @low:       Beginning index from base MSR
 * @high:      End index
 */
struct msr_param {
        struct rdt_resource     *res;
        int                     low;
        int                     high;
};

/**
 * struct rdt_cache - Cache allocation related data
 * @cbm_len:            Length of the cache bit mask
 * @min_cbm_bits:       Minimum number of consecutive bits to be set
 * @cbm_idx_mult:       Multiplier of CBM index
 * @cbm_idx_offset:     Offset of CBM index. CBM index is computed by:
 *                      closid * cbm_idx_multi + cbm_idx_offset
 *                      in a cache bit mask
 * @shareable_bits:     Bitmask of shareable resource with other
 *                      executing entities
 */
struct rdt_cache {
        unsigned int    cbm_len;
        unsigned int    min_cbm_bits;
        unsigned int    cbm_idx_mult;
        unsigned int    cbm_idx_offset;
        unsigned int    shareable_bits;
};

/**
 * struct rdt_membw - Memory bandwidth allocation related data
 * @max_delay:          Max throttle delay. Delay is the hardware
 *                      representation for memory bandwidth.
 * @min_bw:             Minimum memory bandwidth percentage user can request
 * @bw_gran:            Granularity at which the memory bandwidth is allocated
 * @delay_linear:       True if memory B/W delay is in linear scale
 * @mba_sc:             True if MBA software controller(mba_sc) is enabled
 * @mb_map:             Mapping of memory B/W percentage to memory B/W delay
 */
struct rdt_membw {
        u32             max_delay;
        u32             min_bw;
        u32             bw_gran;
        u32             delay_linear;
        bool            mba_sc;
        u32             *mb_map;
};

static inline bool is_llc_occupancy_enabled(void)
{
        return (rdt_mon_features & (1 << QOS_L3_OCCUP_EVENT_ID));
}

static inline bool is_mbm_total_enabled(void)
{
        return (rdt_mon_features & (1 << QOS_L3_MBM_TOTAL_EVENT_ID));
}

static inline bool is_mbm_local_enabled(void)
{
        return (rdt_mon_features & (1 << QOS_L3_MBM_LOCAL_EVENT_ID));
}

static inline bool is_mbm_enabled(void)
{
        return (is_mbm_total_enabled() || is_mbm_local_enabled());
}

static inline bool is_mbm_event(int e)
{
        return (e >= QOS_L3_MBM_TOTAL_EVENT_ID &&
                e <= QOS_L3_MBM_LOCAL_EVENT_ID);
}

struct rdt_parse_data {
        struct rdtgroup         *rdtgrp;
        char                    *buf;
};

/**
 * struct rdt_resource - attributes of an RDT resource
 * @rid:                The index of the resource
 * @alloc_enabled:      Is allocation enabled on this machine
 * @mon_enabled:        Is monitoring enabled for this feature
 * @alloc_capable:      Is allocation available on this machine
 * @mon_capable:        Is monitor feature available on this machine
 * @name:               Name to use in "schemata" file
 * @num_closid:         Number of CLOSIDs available
 * @cache_level:        Which cache level defines scope of this resource
 * @default_ctrl:       Specifies default cache cbm or memory B/W percent.
 * @msr_base:           Base MSR address for CBMs
 * @msr_update:         Function pointer to update QOS MSRs
 * @data_width:         Character width of data when displaying
 * @domains:            All domains for this resource
 * @cache:              Cache allocation related data
 * @format_str:         Per resource format string to show domain value
 * @parse_ctrlval:      Per resource function pointer to parse control values
 * @cbm_validate        Cache bitmask validate function
 * @evt_list:           List of monitoring events
 * @num_rmid:           Number of RMIDs available
 * @mon_scale:          cqm counter * mon_scale = occupancy in bytes
 * @fflags:             flags to choose base and info files
 */
struct rdt_resource {
        int                     rid;
        bool                    alloc_enabled;
        bool                    mon_enabled;
        bool                    alloc_capable;
        bool                    mon_capable;
        char                    *name;
        int                     num_closid;
        int                     cache_level;
        u32                     default_ctrl;
        unsigned int            msr_base;
        void (*msr_update)      (struct rdt_domain *d, struct msr_param *m,
                                 struct rdt_resource *r);
        int                     data_width;
        struct list_head        domains;
        struct rdt_cache        cache;
        struct rdt_membw        membw;
        const char              *format_str;
        int (*parse_ctrlval)(struct rdt_parse_data *data,
                             struct rdt_resource *r,
                             struct rdt_domain *d);
        bool (*cbm_validate)(char *buf, u32 *data, struct rdt_resource *r);
        struct list_head        evt_list;
        int                     num_rmid;
        unsigned int            mon_scale;
        unsigned int            mbm_width;
        unsigned long           fflags;
};

int parse_cbm(struct rdt_parse_data *data, struct rdt_resource *r,
              struct rdt_domain *d);
int parse_bw_intel(struct rdt_parse_data *data, struct rdt_resource *r,
                   struct rdt_domain *d);
int parse_bw_amd(struct rdt_parse_data *data, struct rdt_resource *r,
                 struct rdt_domain *d);

extern struct mutex rdtgroup_mutex;

extern struct rdt_resource rdt_resources_all[];
extern struct rdtgroup rdtgroup_default;
DECLARE_STATIC_KEY_FALSE(rdt_alloc_enable_key);

extern struct dentry *debugfs_resctrl;

enum {
        RDT_RESOURCE_L3,
        RDT_RESOURCE_L3DATA,
        RDT_RESOURCE_L3CODE,
        RDT_RESOURCE_L2,
        RDT_RESOURCE_L2DATA,
        RDT_RESOURCE_L2CODE,
        RDT_RESOURCE_MBA,

        /* Must be the last */
        RDT_NUM_RESOURCES,
};

#define for_each_rdt_resource(r)                                              \
        for (r = rdt_resources_all; r < rdt_resources_all + RDT_NUM_RESOURCES;\
             r++)

#define for_each_capable_rdt_resource(r)                                      \
        for (r = rdt_resources_all; r < rdt_resources_all + RDT_NUM_RESOURCES;\
             r++)                                                             \
                if (r->alloc_capable || r->mon_capable)

#define for_each_alloc_capable_rdt_resource(r)                                \
        for (r = rdt_resources_all; r < rdt_resources_all + RDT_NUM_RESOURCES;\
             r++)                                                             \
                if (r->alloc_capable)

#define for_each_mon_capable_rdt_resource(r)                                  \
        for (r = rdt_resources_all; r < rdt_resources_all + RDT_NUM_RESOURCES;\
             r++)                                                             \
                if (r->mon_capable)

#define for_each_alloc_enabled_rdt_resource(r)                                \
        for (r = rdt_resources_all; r < rdt_resources_all + RDT_NUM_RESOURCES;\
             r++)                                                             \
                if (r->alloc_enabled)

#define for_each_mon_enabled_rdt_resource(r)                                  \
        for (r = rdt_resources_all; r < rdt_resources_all + RDT_NUM_RESOURCES;\
             r++)                                                             \
                if (r->mon_enabled)

/* CPUID.(EAX=10H, ECX=ResID=1).EAX */
union cpuid_0x10_1_eax {
        struct {
                unsigned int cbm_len:5;
        } split;
        unsigned int full;
};

/* CPUID.(EAX=10H, ECX=ResID=3).EAX */
union cpuid_0x10_3_eax {
        struct {
                unsigned int max_delay:12;
        } split;
        unsigned int full;
};

/* CPUID.(EAX=10H, ECX=ResID).EDX */
union cpuid_0x10_x_edx {
        struct {
                unsigned int cos_max:16;
        } split;
        unsigned int full;
};

void rdt_last_cmd_clear(void);
void rdt_last_cmd_puts(const char *s);
void rdt_last_cmd_printf(const char *fmt, ...);

void rdt_ctrl_update(void *arg);
struct rdtgroup *rdtgroup_kn_lock_live(struct kernfs_node *kn);
void rdtgroup_kn_unlock(struct kernfs_node *kn);
int rdtgroup_kn_mode_restrict(struct rdtgroup *r, const char *name);
int rdtgroup_kn_mode_restore(struct rdtgroup *r, const char *name,
                             umode_t mask);
struct rdt_domain *rdt_find_domain(struct rdt_resource *r, int id,
                                   struct list_head **pos);
ssize_t rdtgroup_schemata_write(struct kernfs_open_file *of,
                                char *buf, size_t nbytes, loff_t off);
int rdtgroup_schemata_show(struct kernfs_open_file *of,
                           struct seq_file *s, void *v);
bool rdtgroup_cbm_overlaps(struct rdt_resource *r, struct rdt_domain *d,
                           unsigned long cbm, int closid, bool exclusive);
unsigned int rdtgroup_cbm_to_size(struct rdt_resource *r, struct rdt_domain *d,
                                  unsigned long cbm);
enum rdtgrp_mode rdtgroup_mode_by_closid(int closid);
int rdtgroup_tasks_assigned(struct rdtgroup *r);
int rdtgroup_locksetup_enter(struct rdtgroup *rdtgrp);
int rdtgroup_locksetup_exit(struct rdtgroup *rdtgrp);
bool rdtgroup_cbm_overlaps_pseudo_locked(struct rdt_domain *d, unsigned long cbm);
bool rdtgroup_pseudo_locked_in_hierarchy(struct rdt_domain *d);
int rdt_pseudo_lock_init(void);
void rdt_pseudo_lock_release(void);
int rdtgroup_pseudo_lock_create(struct rdtgroup *rdtgrp);
void rdtgroup_pseudo_lock_remove(struct rdtgroup *rdtgrp);
struct rdt_domain *get_domain_from_cpu(int cpu, struct rdt_resource *r);
int update_domains(struct rdt_resource *r, int closid);
int closids_supported(void);
void closid_free(int closid);
int alloc_rmid(void);
void free_rmid(u32 rmid);
int rdt_get_mon_l3_config(struct rdt_resource *r);
void mon_event_count(void *info);
int rdtgroup_mondata_show(struct seq_file *m, void *arg);
void rmdir_mondata_subdir_allrdtgrp(struct rdt_resource *r,
                                    unsigned int dom_id);
void mkdir_mondata_subdir_allrdtgrp(struct rdt_resource *r,
                                    struct rdt_domain *d);
void mon_event_read(struct rmid_read *rr, struct rdt_resource *r,
                    struct rdt_domain *d, struct rdtgroup *rdtgrp,
                    int evtid, int first);
void mbm_setup_overflow_handler(struct rdt_domain *dom,
                                unsigned long delay_ms);
void mbm_handle_overflow(struct work_struct *work);
bool is_mba_sc(struct rdt_resource *r);
void setup_default_ctrlval(struct rdt_resource *r, u32 *dc, u32 *dm);
u32 delay_bw_map(unsigned long bw, struct rdt_resource *r);
void cqm_setup_limbo_handler(struct rdt_domain *dom, unsigned long delay_ms);
void cqm_handle_limbo(struct work_struct *work);
bool has_busy_rmid(struct rdt_resource *r, struct rdt_domain *d);
void __check_limbo(struct rdt_domain *d, bool force_free);
bool cbm_validate_intel(char *buf, u32 *data, struct rdt_resource *r);
bool cbm_validate_amd(char *buf, u32 *data, struct rdt_resource *r);
void rdt_domain_reconfigure_cdp(struct rdt_resource *r);

#endif /* _ASM_X86_RESCTRL_INTERNAL_H */