diff options
Diffstat (limited to 'arch/powerpc/platforms/cell/spufs/spufs.h')
| -rw-r--r-- | arch/powerpc/platforms/cell/spufs/spufs.h | 359 |
1 files changed, 359 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/cell/spufs/spufs.h b/arch/powerpc/platforms/cell/spufs/spufs.h new file mode 100644 index 000000000..1ba4d884f --- /dev/null +++ b/arch/powerpc/platforms/cell/spufs/spufs.h @@ -0,0 +1,359 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * SPU file system + * + * (C) Copyright IBM Deutschland Entwicklung GmbH 2005 + * + * Author: Arnd Bergmann <arndb@de.ibm.com> + */ +#ifndef SPUFS_H +#define SPUFS_H + +#include <linux/kref.h> +#include <linux/mutex.h> +#include <linux/spinlock.h> +#include <linux/fs.h> +#include <linux/cpumask.h> +#include <linux/sched/signal.h> + +#include <asm/spu.h> +#include <asm/spu_csa.h> +#include <asm/spu_info.h> + +#define SPUFS_PS_MAP_SIZE 0x20000 +#define SPUFS_MFC_MAP_SIZE 0x1000 +#define SPUFS_CNTL_MAP_SIZE 0x1000 +#define SPUFS_SIGNAL_MAP_SIZE PAGE_SIZE +#define SPUFS_MSS_MAP_SIZE 0x1000 + +/* The magic number for our file system */ +enum { + SPUFS_MAGIC = 0x23c9b64e, +}; + +struct spu_context_ops; +struct spu_gang; + +/* ctx->sched_flags */ +enum { + SPU_SCHED_NOTIFY_ACTIVE, + SPU_SCHED_WAS_ACTIVE, /* was active upon spu_acquire_saved() */ + SPU_SCHED_SPU_RUN, /* context is within spu_run */ +}; + +enum { + SWITCH_LOG_BUFSIZE = 4096, +}; + +enum { + SWITCH_LOG_START, + SWITCH_LOG_STOP, + SWITCH_LOG_EXIT, +}; + +struct switch_log { + wait_queue_head_t wait; + unsigned long head; + unsigned long tail; + struct switch_log_entry { + struct timespec64 tstamp; + s32 spu_id; + u32 type; + u32 val; + u64 timebase; + } log[]; +}; + +struct spu_context { + struct spu *spu; /* pointer to a physical SPU */ + struct spu_state csa; /* SPU context save area. */ + spinlock_t mmio_lock; /* protects mmio access */ + struct address_space *local_store; /* local store mapping. */ + struct address_space *mfc; /* 'mfc' area mappings. */ + struct address_space *cntl; /* 'control' area mappings. */ + struct address_space *signal1; /* 'signal1' area mappings. */ + struct address_space *signal2; /* 'signal2' area mappings. */ + struct address_space *mss; /* 'mss' area mappings. */ + struct address_space *psmap; /* 'psmap' area mappings. */ + struct mutex mapping_lock; + u64 object_id; /* user space pointer for oprofile */ + + enum { SPU_STATE_RUNNABLE, SPU_STATE_SAVED } state; + struct mutex state_mutex; + struct mutex run_mutex; + + struct mm_struct *owner; + + struct kref kref; + wait_queue_head_t ibox_wq; + wait_queue_head_t wbox_wq; + wait_queue_head_t stop_wq; + wait_queue_head_t mfc_wq; + wait_queue_head_t run_wq; + u32 tagwait; + struct spu_context_ops *ops; + struct work_struct reap_work; + unsigned long flags; + unsigned long event_return; + + struct list_head gang_list; + struct spu_gang *gang; + struct kref *prof_priv_kref; + void ( * prof_priv_release) (struct kref *kref); + + /* owner thread */ + pid_t tid; + + /* scheduler fields */ + struct list_head rq; + unsigned int time_slice; + unsigned long sched_flags; + cpumask_t cpus_allowed; + int policy; + int prio; + int last_ran; + + /* statistics */ + struct { + /* updates protected by ctx->state_mutex */ + enum spu_utilization_state util_state; + unsigned long long tstamp; /* time of last state switch */ + unsigned long long times[SPU_UTIL_MAX]; + unsigned long long vol_ctx_switch; + unsigned long long invol_ctx_switch; + unsigned long long min_flt; + unsigned long long maj_flt; + unsigned long long hash_flt; + unsigned long long slb_flt; + unsigned long long slb_flt_base; /* # at last ctx switch */ + unsigned long long class2_intr; + unsigned long long class2_intr_base; /* # at last ctx switch */ + unsigned long long libassist; + } stats; + + /* context switch log */ + struct switch_log *switch_log; + + struct list_head aff_list; + int aff_head; + int aff_offset; +}; + +struct spu_gang { + struct list_head list; + struct mutex mutex; + struct kref kref; + int contexts; + + struct spu_context *aff_ref_ctx; + struct list_head aff_list_head; + struct mutex aff_mutex; + int aff_flags; + struct spu *aff_ref_spu; + atomic_t aff_sched_count; +}; + +/* Flag bits for spu_gang aff_flags */ +#define AFF_OFFSETS_SET 1 +#define AFF_MERGED 2 + +struct mfc_dma_command { + int32_t pad; /* reserved */ + uint32_t lsa; /* local storage address */ + uint64_t ea; /* effective address */ + uint16_t size; /* transfer size */ + uint16_t tag; /* command tag */ + uint16_t class; /* class ID */ + uint16_t cmd; /* command opcode */ +}; + + +/* SPU context query/set operations. */ +struct spu_context_ops { + int (*mbox_read) (struct spu_context * ctx, u32 * data); + u32(*mbox_stat_read) (struct spu_context * ctx); + __poll_t (*mbox_stat_poll)(struct spu_context *ctx, __poll_t events); + int (*ibox_read) (struct spu_context * ctx, u32 * data); + int (*wbox_write) (struct spu_context * ctx, u32 data); + u32(*signal1_read) (struct spu_context * ctx); + void (*signal1_write) (struct spu_context * ctx, u32 data); + u32(*signal2_read) (struct spu_context * ctx); + void (*signal2_write) (struct spu_context * ctx, u32 data); + void (*signal1_type_set) (struct spu_context * ctx, u64 val); + u64(*signal1_type_get) (struct spu_context * ctx); + void (*signal2_type_set) (struct spu_context * ctx, u64 val); + u64(*signal2_type_get) (struct spu_context * ctx); + u32(*npc_read) (struct spu_context * ctx); + void (*npc_write) (struct spu_context * ctx, u32 data); + u32(*status_read) (struct spu_context * ctx); + char*(*get_ls) (struct spu_context * ctx); + void (*privcntl_write) (struct spu_context *ctx, u64 data); + u32 (*runcntl_read) (struct spu_context * ctx); + void (*runcntl_write) (struct spu_context * ctx, u32 data); + void (*runcntl_stop) (struct spu_context * ctx); + void (*master_start) (struct spu_context * ctx); + void (*master_stop) (struct spu_context * ctx); + int (*set_mfc_query)(struct spu_context * ctx, u32 mask, u32 mode); + u32 (*read_mfc_tagstatus)(struct spu_context * ctx); + u32 (*get_mfc_free_elements)(struct spu_context *ctx); + int (*send_mfc_command)(struct spu_context * ctx, + struct mfc_dma_command * cmd); + void (*dma_info_read) (struct spu_context * ctx, + struct spu_dma_info * info); + void (*proxydma_info_read) (struct spu_context * ctx, + struct spu_proxydma_info * info); + void (*restart_dma)(struct spu_context *ctx); +}; + +extern struct spu_context_ops spu_hw_ops; +extern struct spu_context_ops spu_backing_ops; + +struct spufs_inode_info { + struct spu_context *i_ctx; + struct spu_gang *i_gang; + struct inode vfs_inode; + int i_openers; +}; +#define SPUFS_I(inode) \ + container_of(inode, struct spufs_inode_info, vfs_inode) + +struct spufs_tree_descr { + const char *name; + const struct file_operations *ops; + umode_t mode; + size_t size; +}; + +extern const struct spufs_tree_descr spufs_dir_contents[]; +extern const struct spufs_tree_descr spufs_dir_nosched_contents[]; +extern const struct spufs_tree_descr spufs_dir_debug_contents[]; + +/* system call implementation */ +extern struct spufs_calls spufs_calls; +struct coredump_params; +long spufs_run_spu(struct spu_context *ctx, u32 *npc, u32 *status); +long spufs_create(struct path *nd, struct dentry *dentry, unsigned int flags, + umode_t mode, struct file *filp); +/* ELF coredump callbacks for writing SPU ELF notes */ +extern int spufs_coredump_extra_notes_size(void); +extern int spufs_coredump_extra_notes_write(struct coredump_params *cprm); + +extern const struct file_operations spufs_context_fops; + +/* gang management */ +struct spu_gang *alloc_spu_gang(void); +struct spu_gang *get_spu_gang(struct spu_gang *gang); +int put_spu_gang(struct spu_gang *gang); +void spu_gang_remove_ctx(struct spu_gang *gang, struct spu_context *ctx); +void spu_gang_add_ctx(struct spu_gang *gang, struct spu_context *ctx); + +/* fault handling */ +int spufs_handle_class1(struct spu_context *ctx); +int spufs_handle_class0(struct spu_context *ctx); + +/* affinity */ +struct spu *affinity_check(struct spu_context *ctx); + +/* context management */ +extern atomic_t nr_spu_contexts; +static inline int __must_check spu_acquire(struct spu_context *ctx) +{ + return mutex_lock_interruptible(&ctx->state_mutex); +} + +static inline void spu_release(struct spu_context *ctx) +{ + mutex_unlock(&ctx->state_mutex); +} + +struct spu_context * alloc_spu_context(struct spu_gang *gang); +void destroy_spu_context(struct kref *kref); +struct spu_context * get_spu_context(struct spu_context *ctx); +int put_spu_context(struct spu_context *ctx); +void spu_unmap_mappings(struct spu_context *ctx); + +void spu_forget(struct spu_context *ctx); +int __must_check spu_acquire_saved(struct spu_context *ctx); +void spu_release_saved(struct spu_context *ctx); + +int spu_stopped(struct spu_context *ctx, u32 * stat); +void spu_del_from_rq(struct spu_context *ctx); +int spu_activate(struct spu_context *ctx, unsigned long flags); +void spu_deactivate(struct spu_context *ctx); +void spu_yield(struct spu_context *ctx); +void spu_switch_notify(struct spu *spu, struct spu_context *ctx); +void spu_switch_log_notify(struct spu *spu, struct spu_context *ctx, + u32 type, u32 val); +void spu_set_timeslice(struct spu_context *ctx); +void spu_update_sched_info(struct spu_context *ctx); +void __spu_update_sched_info(struct spu_context *ctx); +int __init spu_sched_init(void); +void spu_sched_exit(void); + +extern char *isolated_loader; + +/* + * spufs_wait + * Same as wait_event_interruptible(), except that here + * we need to call spu_release(ctx) before sleeping, and + * then spu_acquire(ctx) when awoken. + * + * Returns with state_mutex re-acquired when successful or + * with -ERESTARTSYS and the state_mutex dropped when interrupted. + */ + +#define spufs_wait(wq, condition) \ +({ \ + int __ret = 0; \ + DEFINE_WAIT(__wait); \ + for (;;) { \ + prepare_to_wait(&(wq), &__wait, TASK_INTERRUPTIBLE); \ + if (condition) \ + break; \ + spu_release(ctx); \ + if (signal_pending(current)) { \ + __ret = -ERESTARTSYS; \ + break; \ + } \ + schedule(); \ + __ret = spu_acquire(ctx); \ + if (__ret) \ + break; \ + } \ + finish_wait(&(wq), &__wait); \ + __ret; \ +}) + +size_t spu_wbox_write(struct spu_context *ctx, u32 data); +size_t spu_ibox_read(struct spu_context *ctx, u32 *data); + +/* irq callback funcs. */ +void spufs_ibox_callback(struct spu *spu); +void spufs_wbox_callback(struct spu *spu); +void spufs_stop_callback(struct spu *spu, int irq); +void spufs_mfc_callback(struct spu *spu); +void spufs_dma_callback(struct spu *spu, int type); + +extern struct spu_coredump_calls spufs_coredump_calls; +struct spufs_coredump_reader { + char *name; + ssize_t (*dump)(struct spu_context *ctx, struct coredump_params *cprm); + u64 (*get)(struct spu_context *ctx); + size_t size; +}; +extern const struct spufs_coredump_reader spufs_coredump_read[]; +extern int spufs_coredump_num_notes; + +extern int spu_init_csa(struct spu_state *csa); +extern void spu_fini_csa(struct spu_state *csa); +extern int spu_save(struct spu_state *prev, struct spu *spu); +extern int spu_restore(struct spu_state *new, struct spu *spu); +extern int spu_switch(struct spu_state *prev, struct spu_state *new, + struct spu *spu); +extern int spu_alloc_lscsa(struct spu_state *csa); +extern void spu_free_lscsa(struct spu_state *csa); + +extern void spuctx_switch_state(struct spu_context *ctx, + enum spu_utilization_state new_state); + +#endif |