diff options
Diffstat (limited to 'drivers/misc/sgi-gru/grutables.h')
| -rw-r--r-- | drivers/misc/sgi-gru/grutables.h | 74 |
1 files changed, 69 insertions, 5 deletions
diff --git a/drivers/misc/sgi-gru/grutables.h b/drivers/misc/sgi-gru/grutables.h index f97d84640129..4251018f70ff 100644 --- a/drivers/misc/sgi-gru/grutables.h +++ b/drivers/misc/sgi-gru/grutables.h @@ -24,6 +24,70 @@ #define __GRUTABLES_H__ /* + * GRU Chiplet: + * The GRU is a user addressible memory accelerator. It provides + * several forms of load, store, memset, bcopy instructions. In addition, it + * contains special instructions for AMOs, sending messages to message + * queues, etc. + * + * The GRU is an integral part of the node controller. It connects + * directly to the cpu socket. In its current implementation, there are 2 + * GRU chiplets in the node controller on each blade (~node). + * + * The entire GRU memory space is fully coherent and cacheable by the cpus. + * + * Each GRU chiplet has a physical memory map that looks like the following: + * + * +-----------------+ + * |/////////////////| + * |/////////////////| + * |/////////////////| + * |/////////////////| + * |/////////////////| + * |/////////////////| + * |/////////////////| + * |/////////////////| + * +-----------------+ + * | system control | + * +-----------------+ _______ +-------------+ + * |/////////////////| / | | + * |/////////////////| / | | + * |/////////////////| / | instructions| + * |/////////////////| / | | + * |/////////////////| / | | + * |/////////////////| / |-------------| + * |/////////////////| / | | + * +-----------------+ | | + * | context 15 | | data | + * +-----------------+ | | + * | ...... | \ | | + * +-----------------+ \____________ +-------------+ + * | context 1 | + * +-----------------+ + * | context 0 | + * +-----------------+ + * + * Each of the "contexts" is a chunk of memory that can be mmaped into user + * space. The context consists of 2 parts: + * + * - an instruction space that can be directly accessed by the user + * to issue GRU instructions and to check instruction status. + * + * - a data area that acts as normal RAM. + * + * User instructions contain virtual addresses of data to be accessed by the + * GRU. The GRU contains a TLB that is used to convert these user virtual + * addresses to physical addresses. + * + * The "system control" area of the GRU chiplet is used by the kernel driver + * to manage user contexts and to perform functions such as TLB dropin and + * purging. + * + * One context may be reserved for the kernel and used for cross-partition + * communication. The GRU will also be used to asynchronously zero out + * large blocks of memory (not currently implemented). + * + * * Tables: * * VDATA-VMA Data - Holds a few parameters. Head of linked list of @@ -190,14 +254,14 @@ struct gru_stats_s { #define GRU_STEAL_DELAY ((HZ * 200) / 1000) #define STAT(id) do { \ - if (options & OPT_STATS) \ + if (gru_options & OPT_STATS) \ atomic_long_inc(&gru_stats.id); \ } while (0) #ifdef CONFIG_SGI_GRU_DEBUG #define gru_dbg(dev, fmt, x...) \ do { \ - if (options & OPT_DPRINT) \ + if (gru_options & OPT_DPRINT) \ dev_dbg(dev, "%s: " fmt, __func__, x); \ } while (0) #else @@ -529,9 +593,9 @@ extern void gru_flush_all_tlb(struct gru_state *gru); extern int gru_proc_init(void); extern void gru_proc_exit(void); -extern unsigned long reserve_gru_cb_resources(struct gru_state *gru, +extern unsigned long gru_reserve_cb_resources(struct gru_state *gru, int cbr_au_count, char *cbmap); -extern unsigned long reserve_gru_ds_resources(struct gru_state *gru, +extern unsigned long gru_reserve_ds_resources(struct gru_state *gru, int dsr_au_count, char *dsmap); extern int gru_fault(struct vm_area_struct *, struct vm_fault *vmf); extern struct gru_mm_struct *gru_register_mmu_notifier(void); @@ -540,6 +604,6 @@ extern void gru_drop_mmu_notifier(struct gru_mm_struct *gms); extern void gru_flush_tlb_range(struct gru_mm_struct *gms, unsigned long start, unsigned long len); -extern unsigned long options; +extern unsigned long gru_options; #endif /* __GRUTABLES_H__ */ |