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