610 lines
20 KiB
C
610 lines
20 KiB
C
/*
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* SN Platform GRU Driver
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*
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* GRU DRIVER TABLES, MACROS, externs, etc
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*
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* Copyright (c) 2008 Silicon Graphics, Inc. All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef __GRUTABLES_H__
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#define __GRUTABLES_H__
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/*
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* GRU Chiplet:
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* The GRU is a user addressible memory accelerator. It provides
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* several forms of load, store, memset, bcopy instructions. In addition, it
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* contains special instructions for AMOs, sending messages to message
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* queues, etc.
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*
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* The GRU is an integral part of the node controller. It connects
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* directly to the cpu socket. In its current implementation, there are 2
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* GRU chiplets in the node controller on each blade (~node).
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*
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* The entire GRU memory space is fully coherent and cacheable by the cpus.
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*
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* Each GRU chiplet has a physical memory map that looks like the following:
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*
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* +-----------------+
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* |/////////////////|
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* |/////////////////|
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* |/////////////////|
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* |/////////////////|
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* |/////////////////|
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* |/////////////////|
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* |/////////////////|
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* |/////////////////|
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* +-----------------+
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* | system control |
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* +-----------------+ _______ +-------------+
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* |/////////////////| / | |
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* |/////////////////| / | |
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* |/////////////////| / | instructions|
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* |/////////////////| / | |
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* |/////////////////| / | |
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* |/////////////////| / |-------------|
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* |/////////////////| / | |
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* +-----------------+ | |
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* | context 15 | | data |
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* +-----------------+ | |
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* | ...... | \ | |
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* +-----------------+ \____________ +-------------+
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* | context 1 |
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* +-----------------+
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* | context 0 |
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* +-----------------+
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*
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* Each of the "contexts" is a chunk of memory that can be mmaped into user
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* space. The context consists of 2 parts:
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*
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* - an instruction space that can be directly accessed by the user
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* to issue GRU instructions and to check instruction status.
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*
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* - a data area that acts as normal RAM.
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*
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* User instructions contain virtual addresses of data to be accessed by the
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* GRU. The GRU contains a TLB that is used to convert these user virtual
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* addresses to physical addresses.
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*
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* The "system control" area of the GRU chiplet is used by the kernel driver
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* to manage user contexts and to perform functions such as TLB dropin and
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* purging.
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*
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* One context may be reserved for the kernel and used for cross-partition
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* communication. The GRU will also be used to asynchronously zero out
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* large blocks of memory (not currently implemented).
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*
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*
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* Tables:
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*
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* VDATA-VMA Data - Holds a few parameters. Head of linked list of
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* GTS tables for threads using the GSEG
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* GTS - Gru Thread State - contains info for managing a GSEG context. A
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* GTS is allocated for each thread accessing a
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* GSEG.
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* GTD - GRU Thread Data - contains shadow copy of GRU data when GSEG is
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* not loaded into a GRU
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* GMS - GRU Memory Struct - Used to manage TLB shootdowns. Tracks GRUs
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* where a GSEG has been loaded. Similar to
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* an mm_struct but for GRU.
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*
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* GS - GRU State - Used to manage the state of a GRU chiplet
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* BS - Blade State - Used to manage state of all GRU chiplets
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* on a blade
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*
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*
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* Normal task tables for task using GRU.
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* - 2 threads in process
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* - 2 GSEGs open in process
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* - GSEG1 is being used by both threads
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* - GSEG2 is used only by thread 2
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*
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* task -->|
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* task ---+---> mm ->------ (notifier) -------+-> gms
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* | |
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* |--> vma -> vdata ---> gts--->| GSEG1 (thread1)
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* | | |
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* | +-> gts--->| GSEG1 (thread2)
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* | |
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* |--> vma -> vdata ---> gts--->| GSEG2 (thread2)
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* .
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* .
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*
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* GSEGs are marked DONTCOPY on fork
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*
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* At open
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* file.private_data -> NULL
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*
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* At mmap,
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* vma -> vdata
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*
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* After gseg reference
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* vma -> vdata ->gts
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*
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* After fork
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* parent
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* vma -> vdata -> gts
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* child
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* (vma is not copied)
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*
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*/
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#include <linux/rmap.h>
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#include <linux/interrupt.h>
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#include <linux/mutex.h>
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#include <linux/wait.h>
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#include <linux/mmu_notifier.h>
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#include "gru.h"
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#include "gruhandles.h"
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extern struct gru_stats_s gru_stats;
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extern struct gru_blade_state *gru_base[];
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extern unsigned long gru_start_paddr, gru_end_paddr;
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#define GRU_MAX_BLADES MAX_NUMNODES
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#define GRU_MAX_GRUS (GRU_MAX_BLADES * GRU_CHIPLETS_PER_BLADE)
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#define GRU_DRIVER_ID_STR "SGI GRU Device Driver"
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#define GRU_DRIVER_VERSION_STR "0.80"
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/*
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* GRU statistics.
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*/
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struct gru_stats_s {
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atomic_long_t vdata_alloc;
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atomic_long_t vdata_free;
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atomic_long_t gts_alloc;
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atomic_long_t gts_free;
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atomic_long_t vdata_double_alloc;
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atomic_long_t gts_double_allocate;
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atomic_long_t assign_context;
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atomic_long_t assign_context_failed;
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atomic_long_t free_context;
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atomic_long_t load_context;
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atomic_long_t unload_context;
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atomic_long_t steal_context;
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atomic_long_t steal_context_failed;
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atomic_long_t nopfn;
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atomic_long_t break_cow;
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atomic_long_t asid_new;
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atomic_long_t asid_next;
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atomic_long_t asid_wrap;
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atomic_long_t asid_reuse;
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atomic_long_t intr;
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atomic_long_t call_os;
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atomic_long_t call_os_check_for_bug;
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atomic_long_t call_os_wait_queue;
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atomic_long_t user_flush_tlb;
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atomic_long_t user_unload_context;
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atomic_long_t user_exception;
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atomic_long_t set_task_slice;
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atomic_long_t migrate_check;
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atomic_long_t migrated_retarget;
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atomic_long_t migrated_unload;
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atomic_long_t migrated_unload_delay;
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atomic_long_t migrated_nopfn_retarget;
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atomic_long_t migrated_nopfn_unload;
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atomic_long_t tlb_dropin;
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atomic_long_t tlb_dropin_fail_no_asid;
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atomic_long_t tlb_dropin_fail_upm;
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atomic_long_t tlb_dropin_fail_invalid;
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atomic_long_t tlb_dropin_fail_range_active;
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atomic_long_t tlb_dropin_fail_idle;
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atomic_long_t tlb_dropin_fail_fmm;
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atomic_long_t mmu_invalidate_range;
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atomic_long_t mmu_invalidate_page;
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atomic_long_t mmu_clear_flush_young;
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atomic_long_t flush_tlb;
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atomic_long_t flush_tlb_gru;
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atomic_long_t flush_tlb_gru_tgh;
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atomic_long_t flush_tlb_gru_zero_asid;
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atomic_long_t copy_gpa;
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atomic_long_t mesq_receive;
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atomic_long_t mesq_receive_none;
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atomic_long_t mesq_send;
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atomic_long_t mesq_send_failed;
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atomic_long_t mesq_noop;
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atomic_long_t mesq_send_unexpected_error;
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atomic_long_t mesq_send_lb_overflow;
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atomic_long_t mesq_send_qlimit_reached;
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atomic_long_t mesq_send_amo_nacked;
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atomic_long_t mesq_send_put_nacked;
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atomic_long_t mesq_qf_not_full;
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atomic_long_t mesq_qf_locked;
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atomic_long_t mesq_qf_noop_not_full;
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atomic_long_t mesq_qf_switch_head_failed;
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atomic_long_t mesq_qf_unexpected_error;
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atomic_long_t mesq_noop_unexpected_error;
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atomic_long_t mesq_noop_lb_overflow;
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atomic_long_t mesq_noop_qlimit_reached;
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atomic_long_t mesq_noop_amo_nacked;
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atomic_long_t mesq_noop_put_nacked;
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};
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#define OPT_DPRINT 1
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#define OPT_STATS 2
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#define GRU_QUICKLOOK 4
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#define IRQ_GRU 110 /* Starting IRQ number for interrupts */
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/* Delay in jiffies between attempts to assign a GRU context */
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#define GRU_ASSIGN_DELAY ((HZ * 20) / 1000)
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/*
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* If a process has it's context stolen, min delay in jiffies before trying to
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* steal a context from another process.
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*/
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#define GRU_STEAL_DELAY ((HZ * 200) / 1000)
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#define STAT(id) do { \
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if (gru_options & OPT_STATS) \
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atomic_long_inc(&gru_stats.id); \
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} while (0)
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#ifdef CONFIG_SGI_GRU_DEBUG
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#define gru_dbg(dev, fmt, x...) \
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do { \
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if (gru_options & OPT_DPRINT) \
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dev_dbg(dev, "%s: " fmt, __func__, x); \
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} while (0)
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#else
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#define gru_dbg(x...)
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#endif
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/*-----------------------------------------------------------------------------
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* ASID management
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*/
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#define MAX_ASID 0xfffff0
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#define MIN_ASID 8
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#define ASID_INC 8 /* number of regions */
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/* Generate a GRU asid value from a GRU base asid & a virtual address. */
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#if defined CONFIG_IA64
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#define VADDR_HI_BIT 64
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#define GRUREGION(addr) ((addr) >> (VADDR_HI_BIT - 3) & 3)
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#elif defined __x86_64
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#define VADDR_HI_BIT 48
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#define GRUREGION(addr) (0) /* ZZZ could do better */
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#else
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#error "Unsupported architecture"
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#endif
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#define GRUASID(asid, addr) ((asid) + GRUREGION(addr))
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/*------------------------------------------------------------------------------
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* File & VMS Tables
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*/
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struct gru_state;
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/*
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* This structure is pointed to from the mmstruct via the notifier pointer.
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* There is one of these per address space.
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*/
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struct gru_mm_tracker {
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unsigned int mt_asid_gen; /* ASID wrap count */
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int mt_asid; /* current base ASID for gru */
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unsigned short mt_ctxbitmap; /* bitmap of contexts using
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asid */
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};
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struct gru_mm_struct {
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struct mmu_notifier ms_notifier;
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atomic_t ms_refcnt;
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spinlock_t ms_asid_lock; /* protects ASID assignment */
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atomic_t ms_range_active;/* num range_invals active */
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char ms_released;
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wait_queue_head_t ms_wait_queue;
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DECLARE_BITMAP(ms_asidmap, GRU_MAX_GRUS);
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struct gru_mm_tracker ms_asids[GRU_MAX_GRUS];
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};
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/*
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* One of these structures is allocated when a GSEG is mmaped. The
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* structure is pointed to by the vma->vm_private_data field in the vma struct.
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*/
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struct gru_vma_data {
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spinlock_t vd_lock; /* Serialize access to vma */
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struct list_head vd_head; /* head of linked list of gts */
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long vd_user_options;/* misc user option flags */
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int vd_cbr_au_count;
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int vd_dsr_au_count;
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};
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/*
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* One of these is allocated for each thread accessing a mmaped GRU. A linked
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* list of these structure is hung off the struct gru_vma_data in the mm_struct.
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*/
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struct gru_thread_state {
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struct list_head ts_next; /* list - head at vma-private */
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struct mutex ts_ctxlock; /* load/unload CTX lock */
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struct mm_struct *ts_mm; /* mm currently mapped to
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context */
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struct vm_area_struct *ts_vma; /* vma of GRU context */
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struct gru_state *ts_gru; /* GRU where the context is
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loaded */
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struct gru_mm_struct *ts_gms; /* asid & ioproc struct */
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unsigned long ts_cbr_map; /* map of allocated CBRs */
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unsigned long ts_dsr_map; /* map of allocated DATA
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resources */
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unsigned long ts_steal_jiffies;/* jiffies when context last
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stolen */
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long ts_user_options;/* misc user option flags */
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pid_t ts_tgid_owner; /* task that is using the
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context - for migration */
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int ts_tsid; /* thread that owns the
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structure */
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int ts_tlb_int_select;/* target cpu if interrupts
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enabled */
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int ts_ctxnum; /* context number where the
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context is loaded */
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atomic_t ts_refcnt; /* reference count GTS */
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unsigned char ts_dsr_au_count;/* Number of DSR resources
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required for contest */
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unsigned char ts_cbr_au_count;/* Number of CBR resources
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required for contest */
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char ts_force_unload;/* force context to be unloaded
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after migration */
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char ts_cbr_idx[GRU_CBR_AU];/* CBR numbers of each
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allocated CB */
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unsigned long ts_gdata[0]; /* save area for GRU data (CB,
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DS, CBE) */
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};
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/*
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* Threaded programs actually allocate an array of GSEGs when a context is
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* created. Each thread uses a separate GSEG. TSID is the index into the GSEG
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* array.
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*/
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#define TSID(a, v) (((a) - (v)->vm_start) / GRU_GSEG_PAGESIZE)
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#define UGRUADDR(gts) ((gts)->ts_vma->vm_start + \
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(gts)->ts_tsid * GRU_GSEG_PAGESIZE)
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#define NULLCTX (-1) /* if context not loaded into GRU */
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/*-----------------------------------------------------------------------------
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* GRU State Tables
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*/
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/*
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* One of these exists for each GRU chiplet.
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*/
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struct gru_state {
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struct gru_blade_state *gs_blade; /* GRU state for entire
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blade */
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unsigned long gs_gru_base_paddr; /* Physical address of
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gru segments (64) */
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void *gs_gru_base_vaddr; /* Virtual address of
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gru segments (64) */
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unsigned char gs_gid; /* unique GRU number */
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unsigned char gs_tgh_local_shift; /* used to pick TGH for
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local flush */
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unsigned char gs_tgh_first_remote; /* starting TGH# for
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remote flush */
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unsigned short gs_blade_id; /* blade of GRU */
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spinlock_t gs_asid_lock; /* lock used for
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assigning asids */
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spinlock_t gs_lock; /* lock used for
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assigning contexts */
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/* -- the following are protected by the gs_asid_lock spinlock ---- */
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unsigned int gs_asid; /* Next availe ASID */
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unsigned int gs_asid_limit; /* Limit of available
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ASIDs */
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unsigned int gs_asid_gen; /* asid generation.
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Inc on wrap */
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/* --- the following fields are protected by the gs_lock spinlock --- */
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unsigned long gs_context_map; /* bitmap to manage
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contexts in use */
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unsigned long gs_cbr_map; /* bitmap to manage CB
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resources */
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unsigned long gs_dsr_map; /* bitmap used to manage
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DATA resources */
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unsigned int gs_reserved_cbrs; /* Number of kernel-
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reserved cbrs */
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unsigned int gs_reserved_dsr_bytes; /* Bytes of kernel-
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reserved dsrs */
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unsigned short gs_active_contexts; /* number of contexts
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in use */
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struct gru_thread_state *gs_gts[GRU_NUM_CCH]; /* GTS currently using
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the context */
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};
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/*
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* This structure contains the GRU state for all the GRUs on a blade.
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*/
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struct gru_blade_state {
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void *kernel_cb; /* First kernel
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reserved cb */
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void *kernel_dsr; /* First kernel
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reserved DSR */
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/* ---- the following are protected by the bs_lock spinlock ---- */
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spinlock_t bs_lock; /* lock used for
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stealing contexts */
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int bs_lru_ctxnum; /* STEAL - last context
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stolen */
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struct gru_state *bs_lru_gru; /* STEAL - last gru
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stolen */
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struct gru_state bs_grus[GRU_CHIPLETS_PER_BLADE];
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};
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/*-----------------------------------------------------------------------------
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* Address Primitives
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*/
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#define get_tfm_for_cpu(g, c) \
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((struct gru_tlb_fault_map *)get_tfm((g)->gs_gru_base_vaddr, (c)))
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#define get_tfh_by_index(g, i) \
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((struct gru_tlb_fault_handle *)get_tfh((g)->gs_gru_base_vaddr, (i)))
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#define get_tgh_by_index(g, i) \
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((struct gru_tlb_global_handle *)get_tgh((g)->gs_gru_base_vaddr, (i)))
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#define get_cbe_by_index(g, i) \
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((struct gru_control_block_extended *)get_cbe((g)->gs_gru_base_vaddr,\
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(i)))
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/*-----------------------------------------------------------------------------
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* Useful Macros
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*/
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/* Given a blade# & chiplet#, get a pointer to the GRU */
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#define get_gru(b, c) (&gru_base[b]->bs_grus[c])
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/* Number of bytes to save/restore when unloading/loading GRU contexts */
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#define DSR_BYTES(dsr) ((dsr) * GRU_DSR_AU_BYTES)
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#define CBR_BYTES(cbr) ((cbr) * GRU_HANDLE_BYTES * GRU_CBR_AU_SIZE * 2)
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/* Convert a user CB number to the actual CBRNUM */
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#define thread_cbr_number(gts, n) ((gts)->ts_cbr_idx[(n) / GRU_CBR_AU_SIZE] \
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* GRU_CBR_AU_SIZE + (n) % GRU_CBR_AU_SIZE)
|
|
|
|
/* Convert a gid to a pointer to the GRU */
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|
#define GID_TO_GRU(gid) \
|
|
(gru_base[(gid) / GRU_CHIPLETS_PER_BLADE] ? \
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|
(&gru_base[(gid) / GRU_CHIPLETS_PER_BLADE]-> \
|
|
bs_grus[(gid) % GRU_CHIPLETS_PER_BLADE]) : \
|
|
NULL)
|
|
|
|
/* Scan all active GRUs in a GRU bitmap */
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|
#define for_each_gru_in_bitmap(gid, map) \
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|
for ((gid) = find_first_bit((map), GRU_MAX_GRUS); (gid) < GRU_MAX_GRUS;\
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|
(gid)++, (gid) = find_next_bit((map), GRU_MAX_GRUS, (gid)))
|
|
|
|
/* Scan all active GRUs on a specific blade */
|
|
#define for_each_gru_on_blade(gru, nid, i) \
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|
for ((gru) = gru_base[nid]->bs_grus, (i) = 0; \
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|
(i) < GRU_CHIPLETS_PER_BLADE; \
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|
(i)++, (gru)++)
|
|
|
|
/* Scan all active GTSs on a gru. Note: must hold ss_lock to use this macro. */
|
|
#define for_each_gts_on_gru(gts, gru, ctxnum) \
|
|
for ((ctxnum) = 0; (ctxnum) < GRU_NUM_CCH; (ctxnum)++) \
|
|
if (((gts) = (gru)->gs_gts[ctxnum]))
|
|
|
|
/* Scan each CBR whose bit is set in a TFM (or copy of) */
|
|
#define for_each_cbr_in_tfm(i, map) \
|
|
for ((i) = find_first_bit(map, GRU_NUM_CBE); \
|
|
(i) < GRU_NUM_CBE; \
|
|
(i)++, (i) = find_next_bit(map, GRU_NUM_CBE, i))
|
|
|
|
/* Scan each CBR in a CBR bitmap. Note: multiple CBRs in an allocation unit */
|
|
#define for_each_cbr_in_allocation_map(i, map, k) \
|
|
for ((k) = find_first_bit(map, GRU_CBR_AU); (k) < GRU_CBR_AU; \
|
|
(k) = find_next_bit(map, GRU_CBR_AU, (k) + 1)) \
|
|
for ((i) = (k)*GRU_CBR_AU_SIZE; \
|
|
(i) < ((k) + 1) * GRU_CBR_AU_SIZE; (i)++)
|
|
|
|
/* Scan each DSR in a DSR bitmap. Note: multiple DSRs in an allocation unit */
|
|
#define for_each_dsr_in_allocation_map(i, map, k) \
|
|
for ((k) = find_first_bit((const unsigned long *)map, GRU_DSR_AU);\
|
|
(k) < GRU_DSR_AU; \
|
|
(k) = find_next_bit((const unsigned long *)map, \
|
|
GRU_DSR_AU, (k) + 1)) \
|
|
for ((i) = (k) * GRU_DSR_AU_CL; \
|
|
(i) < ((k) + 1) * GRU_DSR_AU_CL; (i)++)
|
|
|
|
#define gseg_physical_address(gru, ctxnum) \
|
|
((gru)->gs_gru_base_paddr + ctxnum * GRU_GSEG_STRIDE)
|
|
#define gseg_virtual_address(gru, ctxnum) \
|
|
((gru)->gs_gru_base_vaddr + ctxnum * GRU_GSEG_STRIDE)
|
|
|
|
/*-----------------------------------------------------------------------------
|
|
* Lock / Unlock GRU handles
|
|
* Use the "delresp" bit in the handle as a "lock" bit.
|
|
*/
|
|
|
|
/* Lock hierarchy checking enabled only in emulator */
|
|
|
|
static inline void __lock_handle(void *h)
|
|
{
|
|
while (test_and_set_bit(1, h))
|
|
cpu_relax();
|
|
}
|
|
|
|
static inline void __unlock_handle(void *h)
|
|
{
|
|
clear_bit(1, h);
|
|
}
|
|
|
|
static inline void lock_cch_handle(struct gru_context_configuration_handle *cch)
|
|
{
|
|
__lock_handle(cch);
|
|
}
|
|
|
|
static inline void unlock_cch_handle(struct gru_context_configuration_handle
|
|
*cch)
|
|
{
|
|
__unlock_handle(cch);
|
|
}
|
|
|
|
static inline void lock_tgh_handle(struct gru_tlb_global_handle *tgh)
|
|
{
|
|
__lock_handle(tgh);
|
|
}
|
|
|
|
static inline void unlock_tgh_handle(struct gru_tlb_global_handle *tgh)
|
|
{
|
|
__unlock_handle(tgh);
|
|
}
|
|
|
|
/*-----------------------------------------------------------------------------
|
|
* Function prototypes & externs
|
|
*/
|
|
struct gru_unload_context_req;
|
|
|
|
extern struct vm_operations_struct gru_vm_ops;
|
|
extern struct device *grudev;
|
|
|
|
extern struct gru_vma_data *gru_alloc_vma_data(struct vm_area_struct *vma,
|
|
int tsid);
|
|
extern struct gru_thread_state *gru_find_thread_state(struct vm_area_struct
|
|
*vma, int tsid);
|
|
extern struct gru_thread_state *gru_alloc_thread_state(struct vm_area_struct
|
|
*vma, int tsid);
|
|
extern void gru_unload_context(struct gru_thread_state *gts, int savestate);
|
|
extern void gts_drop(struct gru_thread_state *gts);
|
|
extern void gru_tgh_flush_init(struct gru_state *gru);
|
|
extern int gru_kservices_init(struct gru_state *gru);
|
|
extern irqreturn_t gru_intr(int irq, void *dev_id);
|
|
extern int gru_handle_user_call_os(unsigned long address);
|
|
extern int gru_user_flush_tlb(unsigned long arg);
|
|
extern int gru_user_unload_context(unsigned long arg);
|
|
extern int gru_get_exception_detail(unsigned long arg);
|
|
extern int gru_set_task_slice(long address);
|
|
extern int gru_cpu_fault_map_id(void);
|
|
extern struct vm_area_struct *gru_find_vma(unsigned long vaddr);
|
|
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 gru_reserve_cb_resources(struct gru_state *gru,
|
|
int cbr_au_count, char *cbmap);
|
|
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);
|
|
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 gru_options;
|
|
|
|
#endif /* __GRUTABLES_H__ */
|