diff options
Diffstat (limited to 'drivers/misc/sgi-gru/gruhandles.c')
| -rw-r--r-- | drivers/misc/sgi-gru/gruhandles.c | 198 |
1 files changed, 198 insertions, 0 deletions
diff --git a/drivers/misc/sgi-gru/gruhandles.c b/drivers/misc/sgi-gru/gruhandles.c new file mode 100644 index 0000000000..1d75d5e540 --- /dev/null +++ b/drivers/misc/sgi-gru/gruhandles.c @@ -0,0 +1,198 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * GRU KERNEL MCS INSTRUCTIONS + * + * Copyright (c) 2008 Silicon Graphics, Inc. All Rights Reserved. + */ + +#include <linux/kernel.h> +#include "gru.h" +#include "grulib.h" +#include "grutables.h" + +/* 10 sec */ +#ifdef CONFIG_IA64 +#include <asm/processor.h> +#define GRU_OPERATION_TIMEOUT (((cycles_t) local_cpu_data->itc_freq)*10) +#define CLKS2NSEC(c) ((c) *1000000000 / local_cpu_data->itc_freq) +#else +#include <linux/sync_core.h> +#include <asm/tsc.h> +#define GRU_OPERATION_TIMEOUT ((cycles_t) tsc_khz*10*1000) +#define CLKS2NSEC(c) ((c) * 1000000 / tsc_khz) +#endif + +/* Extract the status field from a kernel handle */ +#define GET_MSEG_HANDLE_STATUS(h) (((*(unsigned long *)(h)) >> 16) & 3) + +struct mcs_op_statistic mcs_op_statistics[mcsop_last]; + +static void update_mcs_stats(enum mcs_op op, unsigned long clks) +{ + unsigned long nsec; + + nsec = CLKS2NSEC(clks); + atomic_long_inc(&mcs_op_statistics[op].count); + atomic_long_add(nsec, &mcs_op_statistics[op].total); + if (mcs_op_statistics[op].max < nsec) + mcs_op_statistics[op].max = nsec; +} + +static void start_instruction(void *h) +{ + unsigned long *w0 = h; + + wmb(); /* setting CMD/STATUS bits must be last */ + *w0 = *w0 | 0x20001; + gru_flush_cache(h); +} + +static void report_instruction_timeout(void *h) +{ + unsigned long goff = GSEGPOFF((unsigned long)h); + char *id = "???"; + + if (TYPE_IS(CCH, goff)) + id = "CCH"; + else if (TYPE_IS(TGH, goff)) + id = "TGH"; + else if (TYPE_IS(TFH, goff)) + id = "TFH"; + + panic(KERN_ALERT "GRU %p (%s) is malfunctioning\n", h, id); +} + +static int wait_instruction_complete(void *h, enum mcs_op opc) +{ + int status; + unsigned long start_time = get_cycles(); + + while (1) { + cpu_relax(); + status = GET_MSEG_HANDLE_STATUS(h); + if (status != CCHSTATUS_ACTIVE) + break; + if (GRU_OPERATION_TIMEOUT < (get_cycles() - start_time)) { + report_instruction_timeout(h); + start_time = get_cycles(); + } + } + if (gru_options & OPT_STATS) + update_mcs_stats(opc, get_cycles() - start_time); + return status; +} + +int cch_allocate(struct gru_context_configuration_handle *cch) +{ + int ret; + + cch->opc = CCHOP_ALLOCATE; + start_instruction(cch); + ret = wait_instruction_complete(cch, cchop_allocate); + + /* + * Stop speculation into the GSEG being mapped by the previous ALLOCATE. + * The GSEG memory does not exist until the ALLOCATE completes. + */ + sync_core(); + return ret; +} + +int cch_start(struct gru_context_configuration_handle *cch) +{ + cch->opc = CCHOP_START; + start_instruction(cch); + return wait_instruction_complete(cch, cchop_start); +} + +int cch_interrupt(struct gru_context_configuration_handle *cch) +{ + cch->opc = CCHOP_INTERRUPT; + start_instruction(cch); + return wait_instruction_complete(cch, cchop_interrupt); +} + +int cch_deallocate(struct gru_context_configuration_handle *cch) +{ + int ret; + + cch->opc = CCHOP_DEALLOCATE; + start_instruction(cch); + ret = wait_instruction_complete(cch, cchop_deallocate); + + /* + * Stop speculation into the GSEG being unmapped by the previous + * DEALLOCATE. + */ + sync_core(); + return ret; +} + +int cch_interrupt_sync(struct gru_context_configuration_handle + *cch) +{ + cch->opc = CCHOP_INTERRUPT_SYNC; + start_instruction(cch); + return wait_instruction_complete(cch, cchop_interrupt_sync); +} + +int tgh_invalidate(struct gru_tlb_global_handle *tgh, + unsigned long vaddr, unsigned long vaddrmask, + int asid, int pagesize, int global, int n, + unsigned short ctxbitmap) +{ + tgh->vaddr = vaddr; + tgh->asid = asid; + tgh->pagesize = pagesize; + tgh->n = n; + tgh->global = global; + tgh->vaddrmask = vaddrmask; + tgh->ctxbitmap = ctxbitmap; + tgh->opc = TGHOP_TLBINV; + start_instruction(tgh); + return wait_instruction_complete(tgh, tghop_invalidate); +} + +int tfh_write_only(struct gru_tlb_fault_handle *tfh, + unsigned long paddr, int gaa, + unsigned long vaddr, int asid, int dirty, + int pagesize) +{ + tfh->fillasid = asid; + tfh->fillvaddr = vaddr; + tfh->pfn = paddr >> GRU_PADDR_SHIFT; + tfh->gaa = gaa; + tfh->dirty = dirty; + tfh->pagesize = pagesize; + tfh->opc = TFHOP_WRITE_ONLY; + start_instruction(tfh); + return wait_instruction_complete(tfh, tfhop_write_only); +} + +void tfh_write_restart(struct gru_tlb_fault_handle *tfh, + unsigned long paddr, int gaa, + unsigned long vaddr, int asid, int dirty, + int pagesize) +{ + tfh->fillasid = asid; + tfh->fillvaddr = vaddr; + tfh->pfn = paddr >> GRU_PADDR_SHIFT; + tfh->gaa = gaa; + tfh->dirty = dirty; + tfh->pagesize = pagesize; + tfh->opc = TFHOP_WRITE_RESTART; + start_instruction(tfh); +} + +void tfh_user_polling_mode(struct gru_tlb_fault_handle *tfh) +{ + tfh->opc = TFHOP_USER_POLLING_MODE; + start_instruction(tfh); +} + +void tfh_exception(struct gru_tlb_fault_handle *tfh) +{ + tfh->opc = TFHOP_EXCEPTION; + start_instruction(tfh); +} + |