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55484c45db
Add support to the GRU driver to allow users to specify the blade & chiplet for allocation of GRU contexts. Add new statistics for context loading/unloading/retargeting. Also deleted a few GRU stats that were no longer being unused. Signed-off-by: Jack Steiner <steiner@sgi.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
1086 lines
27 KiB
C
1086 lines
27 KiB
C
/*
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* SN Platform GRU Driver
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*
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* KERNEL SERVICES THAT USE THE GRU
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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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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/slab.h>
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#include <linux/mm.h>
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#include <linux/spinlock.h>
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#include <linux/device.h>
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#include <linux/miscdevice.h>
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#include <linux/proc_fs.h>
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#include <linux/interrupt.h>
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#include <linux/uaccess.h>
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#include <linux/delay.h>
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#include "gru.h"
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#include "grulib.h"
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#include "grutables.h"
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#include "grukservices.h"
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#include "gru_instructions.h"
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#include <asm/uv/uv_hub.h>
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/*
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* Kernel GRU Usage
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*
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* The following is an interim algorithm for management of kernel GRU
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* resources. This will likely be replaced when we better understand the
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* kernel/user requirements.
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*
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* Blade percpu resources reserved for kernel use. These resources are
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* reserved whenever the the kernel context for the blade is loaded. Note
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* that the kernel context is not guaranteed to be always available. It is
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* loaded on demand & can be stolen by a user if the user demand exceeds the
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* kernel demand. The kernel can always reload the kernel context but
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* a SLEEP may be required!!!.
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*
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* Async Overview:
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*
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* Each blade has one "kernel context" that owns GRU kernel resources
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* located on the blade. Kernel drivers use GRU resources in this context
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* for sending messages, zeroing memory, etc.
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*
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* The kernel context is dynamically loaded on demand. If it is not in
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* use by the kernel, the kernel context can be unloaded & given to a user.
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* The kernel context will be reloaded when needed. This may require that
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* a context be stolen from a user.
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* NOTE: frequent unloading/reloading of the kernel context is
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* expensive. We are depending on batch schedulers, cpusets, sane
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* drivers or some other mechanism to prevent the need for frequent
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* stealing/reloading.
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*
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* The kernel context consists of two parts:
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* - 1 CB & a few DSRs that are reserved for each cpu on the blade.
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* Each cpu has it's own private resources & does not share them
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* with other cpus. These resources are used serially, ie,
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* locked, used & unlocked on each call to a function in
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* grukservices.
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* (Now that we have dynamic loading of kernel contexts, I
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* may rethink this & allow sharing between cpus....)
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*
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* - Additional resources can be reserved long term & used directly
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* by UV drivers located in the kernel. Drivers using these GRU
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* resources can use asynchronous GRU instructions that send
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* interrupts on completion.
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* - these resources must be explicitly locked/unlocked
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* - locked resources prevent (obviously) the kernel
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* context from being unloaded.
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* - drivers using these resource directly issue their own
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* GRU instruction and must wait/check completion.
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*
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* When these resources are reserved, the caller can optionally
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* associate a wait_queue with the resources and use asynchronous
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* GRU instructions. When an async GRU instruction completes, the
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* driver will do a wakeup on the event.
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*
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*/
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#define ASYNC_HAN_TO_BID(h) ((h) - 1)
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#define ASYNC_BID_TO_HAN(b) ((b) + 1)
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#define ASYNC_HAN_TO_BS(h) gru_base[ASYNC_HAN_TO_BID(h)]
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#define KCB_TO_GID(cb) ((cb - gru_start_vaddr) / \
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(GRU_SIZE * GRU_CHIPLETS_PER_BLADE))
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#define KCB_TO_BS(cb) gru_base[KCB_TO_GID(cb)]
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#define GRU_NUM_KERNEL_CBR 1
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#define GRU_NUM_KERNEL_DSR_BYTES 256
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#define GRU_NUM_KERNEL_DSR_CL (GRU_NUM_KERNEL_DSR_BYTES / \
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GRU_CACHE_LINE_BYTES)
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/* GRU instruction attributes for all instructions */
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#define IMA IMA_CB_DELAY
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/* GRU cacheline size is always 64 bytes - even on arches with 128 byte lines */
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#define __gru_cacheline_aligned__ \
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__attribute__((__aligned__(GRU_CACHE_LINE_BYTES)))
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#define MAGIC 0x1234567887654321UL
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/* Default retry count for GRU errors on kernel instructions */
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#define EXCEPTION_RETRY_LIMIT 3
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/* Status of message queue sections */
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#define MQS_EMPTY 0
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#define MQS_FULL 1
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#define MQS_NOOP 2
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/*----------------- RESOURCE MANAGEMENT -------------------------------------*/
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/* optimized for x86_64 */
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struct message_queue {
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union gru_mesqhead head __gru_cacheline_aligned__; /* CL 0 */
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int qlines; /* DW 1 */
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long hstatus[2];
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void *next __gru_cacheline_aligned__;/* CL 1 */
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void *limit;
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void *start;
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void *start2;
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char data ____cacheline_aligned; /* CL 2 */
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};
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/* First word in every message - used by mesq interface */
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struct message_header {
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char present;
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char present2;
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char lines;
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char fill;
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};
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#define HSTATUS(mq, h) ((mq) + offsetof(struct message_queue, hstatus[h]))
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/*
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* Reload the blade's kernel context into a GRU chiplet. Called holding
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* the bs_kgts_sema for READ. Will steal user contexts if necessary.
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*/
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static void gru_load_kernel_context(struct gru_blade_state *bs, int blade_id)
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{
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struct gru_state *gru;
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struct gru_thread_state *kgts;
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void *vaddr;
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int ctxnum, ncpus;
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up_read(&bs->bs_kgts_sema);
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down_write(&bs->bs_kgts_sema);
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if (!bs->bs_kgts) {
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bs->bs_kgts = gru_alloc_gts(NULL, 0, 0, 0, 0);
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bs->bs_kgts->ts_user_blade_id = blade_id;
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}
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kgts = bs->bs_kgts;
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if (!kgts->ts_gru) {
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STAT(load_kernel_context);
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ncpus = uv_blade_nr_possible_cpus(blade_id);
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kgts->ts_cbr_au_count = GRU_CB_COUNT_TO_AU(
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GRU_NUM_KERNEL_CBR * ncpus + bs->bs_async_cbrs);
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kgts->ts_dsr_au_count = GRU_DS_BYTES_TO_AU(
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GRU_NUM_KERNEL_DSR_BYTES * ncpus +
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bs->bs_async_dsr_bytes);
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while (!gru_assign_gru_context(kgts)) {
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msleep(1);
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gru_steal_context(kgts);
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}
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gru_load_context(kgts);
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gru = bs->bs_kgts->ts_gru;
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vaddr = gru->gs_gru_base_vaddr;
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ctxnum = kgts->ts_ctxnum;
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bs->kernel_cb = get_gseg_base_address_cb(vaddr, ctxnum, 0);
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bs->kernel_dsr = get_gseg_base_address_ds(vaddr, ctxnum, 0);
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}
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downgrade_write(&bs->bs_kgts_sema);
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}
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/*
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* Free all kernel contexts that are not currently in use.
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* Returns 0 if all freed, else number of inuse context.
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*/
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static int gru_free_kernel_contexts(void)
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{
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struct gru_blade_state *bs;
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struct gru_thread_state *kgts;
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int bid, ret = 0;
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for (bid = 0; bid < GRU_MAX_BLADES; bid++) {
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bs = gru_base[bid];
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if (!bs)
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continue;
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/* Ignore busy contexts. Don't want to block here. */
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if (down_write_trylock(&bs->bs_kgts_sema)) {
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kgts = bs->bs_kgts;
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if (kgts && kgts->ts_gru)
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gru_unload_context(kgts, 0);
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bs->bs_kgts = NULL;
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up_write(&bs->bs_kgts_sema);
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kfree(kgts);
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} else {
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ret++;
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}
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}
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return ret;
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}
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/*
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* Lock & load the kernel context for the specified blade.
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*/
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static struct gru_blade_state *gru_lock_kernel_context(int blade_id)
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{
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struct gru_blade_state *bs;
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STAT(lock_kernel_context);
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bs = gru_base[blade_id];
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down_read(&bs->bs_kgts_sema);
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if (!bs->bs_kgts || !bs->bs_kgts->ts_gru)
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gru_load_kernel_context(bs, blade_id);
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return bs;
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}
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/*
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* Unlock the kernel context for the specified blade. Context is not
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* unloaded but may be stolen before next use.
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*/
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static void gru_unlock_kernel_context(int blade_id)
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{
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struct gru_blade_state *bs;
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bs = gru_base[blade_id];
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up_read(&bs->bs_kgts_sema);
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STAT(unlock_kernel_context);
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}
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/*
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* Reserve & get pointers to the DSR/CBRs reserved for the current cpu.
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* - returns with preemption disabled
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*/
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static int gru_get_cpu_resources(int dsr_bytes, void **cb, void **dsr)
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{
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struct gru_blade_state *bs;
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int lcpu;
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BUG_ON(dsr_bytes > GRU_NUM_KERNEL_DSR_BYTES);
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preempt_disable();
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bs = gru_lock_kernel_context(uv_numa_blade_id());
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lcpu = uv_blade_processor_id();
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*cb = bs->kernel_cb + lcpu * GRU_HANDLE_STRIDE;
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*dsr = bs->kernel_dsr + lcpu * GRU_NUM_KERNEL_DSR_BYTES;
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return 0;
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}
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/*
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* Free the current cpus reserved DSR/CBR resources.
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*/
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static void gru_free_cpu_resources(void *cb, void *dsr)
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{
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gru_unlock_kernel_context(uv_numa_blade_id());
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preempt_enable();
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}
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/*
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* Reserve GRU resources to be used asynchronously.
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* Note: currently supports only 1 reservation per blade.
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*
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* input:
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* blade_id - blade on which resources should be reserved
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* cbrs - number of CBRs
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* dsr_bytes - number of DSR bytes needed
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* output:
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* handle to identify resource
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* (0 = async resources already reserved)
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*/
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unsigned long gru_reserve_async_resources(int blade_id, int cbrs, int dsr_bytes,
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struct completion *cmp)
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{
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struct gru_blade_state *bs;
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struct gru_thread_state *kgts;
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int ret = 0;
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bs = gru_base[blade_id];
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down_write(&bs->bs_kgts_sema);
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/* Verify no resources already reserved */
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if (bs->bs_async_dsr_bytes + bs->bs_async_cbrs)
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goto done;
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bs->bs_async_dsr_bytes = dsr_bytes;
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bs->bs_async_cbrs = cbrs;
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bs->bs_async_wq = cmp;
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kgts = bs->bs_kgts;
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/* Resources changed. Unload context if already loaded */
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if (kgts && kgts->ts_gru)
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gru_unload_context(kgts, 0);
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ret = ASYNC_BID_TO_HAN(blade_id);
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done:
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up_write(&bs->bs_kgts_sema);
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return ret;
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}
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/*
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* Release async resources previously reserved.
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*
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* input:
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* han - handle to identify resources
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*/
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void gru_release_async_resources(unsigned long han)
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{
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struct gru_blade_state *bs = ASYNC_HAN_TO_BS(han);
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down_write(&bs->bs_kgts_sema);
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bs->bs_async_dsr_bytes = 0;
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bs->bs_async_cbrs = 0;
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bs->bs_async_wq = NULL;
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up_write(&bs->bs_kgts_sema);
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}
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/*
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* Wait for async GRU instructions to complete.
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*
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* input:
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* han - handle to identify resources
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*/
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void gru_wait_async_cbr(unsigned long han)
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{
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struct gru_blade_state *bs = ASYNC_HAN_TO_BS(han);
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wait_for_completion(bs->bs_async_wq);
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mb();
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}
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/*
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* Lock previous reserved async GRU resources
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*
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* input:
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* han - handle to identify resources
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* output:
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* cb - pointer to first CBR
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* dsr - pointer to first DSR
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*/
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void gru_lock_async_resource(unsigned long han, void **cb, void **dsr)
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{
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struct gru_blade_state *bs = ASYNC_HAN_TO_BS(han);
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int blade_id = ASYNC_HAN_TO_BID(han);
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int ncpus;
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gru_lock_kernel_context(blade_id);
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ncpus = uv_blade_nr_possible_cpus(blade_id);
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if (cb)
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*cb = bs->kernel_cb + ncpus * GRU_HANDLE_STRIDE;
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if (dsr)
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*dsr = bs->kernel_dsr + ncpus * GRU_NUM_KERNEL_DSR_BYTES;
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}
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/*
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* Unlock previous reserved async GRU resources
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*
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* input:
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* han - handle to identify resources
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*/
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void gru_unlock_async_resource(unsigned long han)
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{
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int blade_id = ASYNC_HAN_TO_BID(han);
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gru_unlock_kernel_context(blade_id);
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}
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/*----------------------------------------------------------------------*/
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int gru_get_cb_exception_detail(void *cb,
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struct control_block_extended_exc_detail *excdet)
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{
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struct gru_control_block_extended *cbe;
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struct gru_blade_state *bs;
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int cbrnum;
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bs = KCB_TO_BS(cb);
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cbrnum = thread_cbr_number(bs->bs_kgts, get_cb_number(cb));
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cbe = get_cbe(GRUBASE(cb), cbrnum);
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gru_flush_cache(cbe); /* CBE not coherent */
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excdet->opc = cbe->opccpy;
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excdet->exopc = cbe->exopccpy;
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excdet->ecause = cbe->ecause;
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excdet->exceptdet0 = cbe->idef1upd;
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excdet->exceptdet1 = cbe->idef3upd;
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gru_flush_cache(cbe);
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return 0;
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}
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char *gru_get_cb_exception_detail_str(int ret, void *cb,
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char *buf, int size)
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{
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struct gru_control_block_status *gen = (void *)cb;
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struct control_block_extended_exc_detail excdet;
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if (ret > 0 && gen->istatus == CBS_EXCEPTION) {
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gru_get_cb_exception_detail(cb, &excdet);
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snprintf(buf, size,
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"GRU exception: cb %p, opc %d, exopc %d, ecause 0x%x,"
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"excdet0 0x%lx, excdet1 0x%x",
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gen, excdet.opc, excdet.exopc, excdet.ecause,
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excdet.exceptdet0, excdet.exceptdet1);
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} else {
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snprintf(buf, size, "No exception");
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}
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return buf;
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}
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static int gru_wait_idle_or_exception(struct gru_control_block_status *gen)
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{
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while (gen->istatus >= CBS_ACTIVE) {
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cpu_relax();
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barrier();
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}
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return gen->istatus;
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}
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static int gru_retry_exception(void *cb)
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{
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struct gru_control_block_status *gen = (void *)cb;
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struct control_block_extended_exc_detail excdet;
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int retry = EXCEPTION_RETRY_LIMIT;
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while (1) {
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if (gru_wait_idle_or_exception(gen) == CBS_IDLE)
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return CBS_IDLE;
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if (gru_get_cb_message_queue_substatus(cb))
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return CBS_EXCEPTION;
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gru_get_cb_exception_detail(cb, &excdet);
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if ((excdet.ecause & ~EXCEPTION_RETRY_BITS) ||
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(excdet.cbrexecstatus & CBR_EXS_ABORT_OCC))
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break;
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if (retry-- == 0)
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break;
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gen->icmd = 1;
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gru_flush_cache(gen);
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}
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return CBS_EXCEPTION;
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}
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int gru_check_status_proc(void *cb)
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{
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struct gru_control_block_status *gen = (void *)cb;
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int ret;
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ret = gen->istatus;
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if (ret != CBS_EXCEPTION)
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return ret;
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return gru_retry_exception(cb);
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}
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int gru_wait_proc(void *cb)
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{
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struct gru_control_block_status *gen = (void *)cb;
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int ret;
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ret = gru_wait_idle_or_exception(gen);
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if (ret == CBS_EXCEPTION)
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ret = gru_retry_exception(cb);
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return ret;
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}
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void gru_abort(int ret, void *cb, char *str)
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{
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char buf[GRU_EXC_STR_SIZE];
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panic("GRU FATAL ERROR: %s - %s\n", str,
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gru_get_cb_exception_detail_str(ret, cb, buf, sizeof(buf)));
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}
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void gru_wait_abort_proc(void *cb)
|
|
{
|
|
int ret;
|
|
|
|
ret = gru_wait_proc(cb);
|
|
if (ret)
|
|
gru_abort(ret, cb, "gru_wait_abort");
|
|
}
|
|
|
|
|
|
/*------------------------------ MESSAGE QUEUES -----------------------------*/
|
|
|
|
/* Internal status . These are NOT returned to the user. */
|
|
#define MQIE_AGAIN -1 /* try again */
|
|
|
|
|
|
/*
|
|
* Save/restore the "present" flag that is in the second line of 2-line
|
|
* messages
|
|
*/
|
|
static inline int get_present2(void *p)
|
|
{
|
|
struct message_header *mhdr = p + GRU_CACHE_LINE_BYTES;
|
|
return mhdr->present;
|
|
}
|
|
|
|
static inline void restore_present2(void *p, int val)
|
|
{
|
|
struct message_header *mhdr = p + GRU_CACHE_LINE_BYTES;
|
|
mhdr->present = val;
|
|
}
|
|
|
|
/*
|
|
* Create a message queue.
|
|
* qlines - message queue size in cache lines. Includes 2-line header.
|
|
*/
|
|
int gru_create_message_queue(struct gru_message_queue_desc *mqd,
|
|
void *p, unsigned int bytes, int nasid, int vector, int apicid)
|
|
{
|
|
struct message_queue *mq = p;
|
|
unsigned int qlines;
|
|
|
|
qlines = bytes / GRU_CACHE_LINE_BYTES - 2;
|
|
memset(mq, 0, bytes);
|
|
mq->start = &mq->data;
|
|
mq->start2 = &mq->data + (qlines / 2 - 1) * GRU_CACHE_LINE_BYTES;
|
|
mq->next = &mq->data;
|
|
mq->limit = &mq->data + (qlines - 2) * GRU_CACHE_LINE_BYTES;
|
|
mq->qlines = qlines;
|
|
mq->hstatus[0] = 0;
|
|
mq->hstatus[1] = 1;
|
|
mq->head = gru_mesq_head(2, qlines / 2 + 1);
|
|
mqd->mq = mq;
|
|
mqd->mq_gpa = uv_gpa(mq);
|
|
mqd->qlines = qlines;
|
|
mqd->interrupt_pnode = UV_NASID_TO_PNODE(nasid);
|
|
mqd->interrupt_vector = vector;
|
|
mqd->interrupt_apicid = apicid;
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(gru_create_message_queue);
|
|
|
|
/*
|
|
* Send a NOOP message to a message queue
|
|
* Returns:
|
|
* 0 - if queue is full after the send. This is the normal case
|
|
* but various races can change this.
|
|
* -1 - if mesq sent successfully but queue not full
|
|
* >0 - unexpected error. MQE_xxx returned
|
|
*/
|
|
static int send_noop_message(void *cb, struct gru_message_queue_desc *mqd,
|
|
void *mesg)
|
|
{
|
|
const struct message_header noop_header = {
|
|
.present = MQS_NOOP, .lines = 1};
|
|
unsigned long m;
|
|
int substatus, ret;
|
|
struct message_header save_mhdr, *mhdr = mesg;
|
|
|
|
STAT(mesq_noop);
|
|
save_mhdr = *mhdr;
|
|
*mhdr = noop_header;
|
|
gru_mesq(cb, mqd->mq_gpa, gru_get_tri(mhdr), 1, IMA);
|
|
ret = gru_wait(cb);
|
|
|
|
if (ret) {
|
|
substatus = gru_get_cb_message_queue_substatus(cb);
|
|
switch (substatus) {
|
|
case CBSS_NO_ERROR:
|
|
STAT(mesq_noop_unexpected_error);
|
|
ret = MQE_UNEXPECTED_CB_ERR;
|
|
break;
|
|
case CBSS_LB_OVERFLOWED:
|
|
STAT(mesq_noop_lb_overflow);
|
|
ret = MQE_CONGESTION;
|
|
break;
|
|
case CBSS_QLIMIT_REACHED:
|
|
STAT(mesq_noop_qlimit_reached);
|
|
ret = 0;
|
|
break;
|
|
case CBSS_AMO_NACKED:
|
|
STAT(mesq_noop_amo_nacked);
|
|
ret = MQE_CONGESTION;
|
|
break;
|
|
case CBSS_PUT_NACKED:
|
|
STAT(mesq_noop_put_nacked);
|
|
m = mqd->mq_gpa + (gru_get_amo_value_head(cb) << 6);
|
|
gru_vstore(cb, m, gru_get_tri(mesg), XTYPE_CL, 1, 1,
|
|
IMA);
|
|
if (gru_wait(cb) == CBS_IDLE)
|
|
ret = MQIE_AGAIN;
|
|
else
|
|
ret = MQE_UNEXPECTED_CB_ERR;
|
|
break;
|
|
case CBSS_PAGE_OVERFLOW:
|
|
default:
|
|
BUG();
|
|
}
|
|
}
|
|
*mhdr = save_mhdr;
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Handle a gru_mesq full.
|
|
*/
|
|
static int send_message_queue_full(void *cb, struct gru_message_queue_desc *mqd,
|
|
void *mesg, int lines)
|
|
{
|
|
union gru_mesqhead mqh;
|
|
unsigned int limit, head;
|
|
unsigned long avalue;
|
|
int half, qlines;
|
|
|
|
/* Determine if switching to first/second half of q */
|
|
avalue = gru_get_amo_value(cb);
|
|
head = gru_get_amo_value_head(cb);
|
|
limit = gru_get_amo_value_limit(cb);
|
|
|
|
qlines = mqd->qlines;
|
|
half = (limit != qlines);
|
|
|
|
if (half)
|
|
mqh = gru_mesq_head(qlines / 2 + 1, qlines);
|
|
else
|
|
mqh = gru_mesq_head(2, qlines / 2 + 1);
|
|
|
|
/* Try to get lock for switching head pointer */
|
|
gru_gamir(cb, EOP_IR_CLR, HSTATUS(mqd->mq_gpa, half), XTYPE_DW, IMA);
|
|
if (gru_wait(cb) != CBS_IDLE)
|
|
goto cberr;
|
|
if (!gru_get_amo_value(cb)) {
|
|
STAT(mesq_qf_locked);
|
|
return MQE_QUEUE_FULL;
|
|
}
|
|
|
|
/* Got the lock. Send optional NOP if queue not full, */
|
|
if (head != limit) {
|
|
if (send_noop_message(cb, mqd, mesg)) {
|
|
gru_gamir(cb, EOP_IR_INC, HSTATUS(mqd->mq_gpa, half),
|
|
XTYPE_DW, IMA);
|
|
if (gru_wait(cb) != CBS_IDLE)
|
|
goto cberr;
|
|
STAT(mesq_qf_noop_not_full);
|
|
return MQIE_AGAIN;
|
|
}
|
|
avalue++;
|
|
}
|
|
|
|
/* Then flip queuehead to other half of queue. */
|
|
gru_gamer(cb, EOP_ERR_CSWAP, mqd->mq_gpa, XTYPE_DW, mqh.val, avalue,
|
|
IMA);
|
|
if (gru_wait(cb) != CBS_IDLE)
|
|
goto cberr;
|
|
|
|
/* If not successfully in swapping queue head, clear the hstatus lock */
|
|
if (gru_get_amo_value(cb) != avalue) {
|
|
STAT(mesq_qf_switch_head_failed);
|
|
gru_gamir(cb, EOP_IR_INC, HSTATUS(mqd->mq_gpa, half), XTYPE_DW,
|
|
IMA);
|
|
if (gru_wait(cb) != CBS_IDLE)
|
|
goto cberr;
|
|
}
|
|
return MQIE_AGAIN;
|
|
cberr:
|
|
STAT(mesq_qf_unexpected_error);
|
|
return MQE_UNEXPECTED_CB_ERR;
|
|
}
|
|
|
|
/*
|
|
* Send a cross-partition interrupt to the SSI that contains the target
|
|
* message queue. Normally, the interrupt is automatically delivered by hardware
|
|
* but some error conditions require explicit delivery.
|
|
*/
|
|
static void send_message_queue_interrupt(struct gru_message_queue_desc *mqd)
|
|
{
|
|
if (mqd->interrupt_vector)
|
|
uv_hub_send_ipi(mqd->interrupt_pnode, mqd->interrupt_apicid,
|
|
mqd->interrupt_vector);
|
|
}
|
|
|
|
/*
|
|
* Handle a PUT failure. Note: if message was a 2-line message, one of the
|
|
* lines might have successfully have been written. Before sending the
|
|
* message, "present" must be cleared in BOTH lines to prevent the receiver
|
|
* from prematurely seeing the full message.
|
|
*/
|
|
static int send_message_put_nacked(void *cb, struct gru_message_queue_desc *mqd,
|
|
void *mesg, int lines)
|
|
{
|
|
unsigned long m;
|
|
|
|
m = mqd->mq_gpa + (gru_get_amo_value_head(cb) << 6);
|
|
if (lines == 2) {
|
|
gru_vset(cb, m, 0, XTYPE_CL, lines, 1, IMA);
|
|
if (gru_wait(cb) != CBS_IDLE)
|
|
return MQE_UNEXPECTED_CB_ERR;
|
|
}
|
|
gru_vstore(cb, m, gru_get_tri(mesg), XTYPE_CL, lines, 1, IMA);
|
|
if (gru_wait(cb) != CBS_IDLE)
|
|
return MQE_UNEXPECTED_CB_ERR;
|
|
send_message_queue_interrupt(mqd);
|
|
return MQE_OK;
|
|
}
|
|
|
|
/*
|
|
* Handle a gru_mesq failure. Some of these failures are software recoverable
|
|
* or retryable.
|
|
*/
|
|
static int send_message_failure(void *cb, struct gru_message_queue_desc *mqd,
|
|
void *mesg, int lines)
|
|
{
|
|
int substatus, ret = 0;
|
|
|
|
substatus = gru_get_cb_message_queue_substatus(cb);
|
|
switch (substatus) {
|
|
case CBSS_NO_ERROR:
|
|
STAT(mesq_send_unexpected_error);
|
|
ret = MQE_UNEXPECTED_CB_ERR;
|
|
break;
|
|
case CBSS_LB_OVERFLOWED:
|
|
STAT(mesq_send_lb_overflow);
|
|
ret = MQE_CONGESTION;
|
|
break;
|
|
case CBSS_QLIMIT_REACHED:
|
|
STAT(mesq_send_qlimit_reached);
|
|
ret = send_message_queue_full(cb, mqd, mesg, lines);
|
|
break;
|
|
case CBSS_AMO_NACKED:
|
|
STAT(mesq_send_amo_nacked);
|
|
ret = MQE_CONGESTION;
|
|
break;
|
|
case CBSS_PUT_NACKED:
|
|
STAT(mesq_send_put_nacked);
|
|
ret = send_message_put_nacked(cb, mqd, mesg, lines);
|
|
break;
|
|
default:
|
|
BUG();
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Send a message to a message queue
|
|
* mqd message queue descriptor
|
|
* mesg message. ust be vaddr within a GSEG
|
|
* bytes message size (<= 2 CL)
|
|
*/
|
|
int gru_send_message_gpa(struct gru_message_queue_desc *mqd, void *mesg,
|
|
unsigned int bytes)
|
|
{
|
|
struct message_header *mhdr;
|
|
void *cb;
|
|
void *dsr;
|
|
int istatus, clines, ret;
|
|
|
|
STAT(mesq_send);
|
|
BUG_ON(bytes < sizeof(int) || bytes > 2 * GRU_CACHE_LINE_BYTES);
|
|
|
|
clines = DIV_ROUND_UP(bytes, GRU_CACHE_LINE_BYTES);
|
|
if (gru_get_cpu_resources(bytes, &cb, &dsr))
|
|
return MQE_BUG_NO_RESOURCES;
|
|
memcpy(dsr, mesg, bytes);
|
|
mhdr = dsr;
|
|
mhdr->present = MQS_FULL;
|
|
mhdr->lines = clines;
|
|
if (clines == 2) {
|
|
mhdr->present2 = get_present2(mhdr);
|
|
restore_present2(mhdr, MQS_FULL);
|
|
}
|
|
|
|
do {
|
|
ret = MQE_OK;
|
|
gru_mesq(cb, mqd->mq_gpa, gru_get_tri(mhdr), clines, IMA);
|
|
istatus = gru_wait(cb);
|
|
if (istatus != CBS_IDLE)
|
|
ret = send_message_failure(cb, mqd, dsr, clines);
|
|
} while (ret == MQIE_AGAIN);
|
|
gru_free_cpu_resources(cb, dsr);
|
|
|
|
if (ret)
|
|
STAT(mesq_send_failed);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(gru_send_message_gpa);
|
|
|
|
/*
|
|
* Advance the receive pointer for the queue to the next message.
|
|
*/
|
|
void gru_free_message(struct gru_message_queue_desc *mqd, void *mesg)
|
|
{
|
|
struct message_queue *mq = mqd->mq;
|
|
struct message_header *mhdr = mq->next;
|
|
void *next, *pnext;
|
|
int half = -1;
|
|
int lines = mhdr->lines;
|
|
|
|
if (lines == 2)
|
|
restore_present2(mhdr, MQS_EMPTY);
|
|
mhdr->present = MQS_EMPTY;
|
|
|
|
pnext = mq->next;
|
|
next = pnext + GRU_CACHE_LINE_BYTES * lines;
|
|
if (next == mq->limit) {
|
|
next = mq->start;
|
|
half = 1;
|
|
} else if (pnext < mq->start2 && next >= mq->start2) {
|
|
half = 0;
|
|
}
|
|
|
|
if (half >= 0)
|
|
mq->hstatus[half] = 1;
|
|
mq->next = next;
|
|
}
|
|
EXPORT_SYMBOL_GPL(gru_free_message);
|
|
|
|
/*
|
|
* Get next message from message queue. Return NULL if no message
|
|
* present. User must call next_message() to move to next message.
|
|
* rmq message queue
|
|
*/
|
|
void *gru_get_next_message(struct gru_message_queue_desc *mqd)
|
|
{
|
|
struct message_queue *mq = mqd->mq;
|
|
struct message_header *mhdr = mq->next;
|
|
int present = mhdr->present;
|
|
|
|
/* skip NOOP messages */
|
|
STAT(mesq_receive);
|
|
while (present == MQS_NOOP) {
|
|
gru_free_message(mqd, mhdr);
|
|
mhdr = mq->next;
|
|
present = mhdr->present;
|
|
}
|
|
|
|
/* Wait for both halves of 2 line messages */
|
|
if (present == MQS_FULL && mhdr->lines == 2 &&
|
|
get_present2(mhdr) == MQS_EMPTY)
|
|
present = MQS_EMPTY;
|
|
|
|
if (!present) {
|
|
STAT(mesq_receive_none);
|
|
return NULL;
|
|
}
|
|
|
|
if (mhdr->lines == 2)
|
|
restore_present2(mhdr, mhdr->present2);
|
|
|
|
return mhdr;
|
|
}
|
|
EXPORT_SYMBOL_GPL(gru_get_next_message);
|
|
|
|
/* ---------------------- GRU DATA COPY FUNCTIONS ---------------------------*/
|
|
|
|
/*
|
|
* Load a DW from a global GPA. The GPA can be a memory or MMR address.
|
|
*/
|
|
int gru_read_gpa(unsigned long *value, unsigned long gpa)
|
|
{
|
|
void *cb;
|
|
void *dsr;
|
|
int ret, iaa;
|
|
|
|
STAT(read_gpa);
|
|
if (gru_get_cpu_resources(GRU_NUM_KERNEL_DSR_BYTES, &cb, &dsr))
|
|
return MQE_BUG_NO_RESOURCES;
|
|
iaa = gpa >> 62;
|
|
gru_vload_phys(cb, gpa, gru_get_tri(dsr), iaa, IMA);
|
|
ret = gru_wait(cb);
|
|
if (ret == CBS_IDLE)
|
|
*value = *(unsigned long *)dsr;
|
|
gru_free_cpu_resources(cb, dsr);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(gru_read_gpa);
|
|
|
|
|
|
/*
|
|
* Copy a block of data using the GRU resources
|
|
*/
|
|
int gru_copy_gpa(unsigned long dest_gpa, unsigned long src_gpa,
|
|
unsigned int bytes)
|
|
{
|
|
void *cb;
|
|
void *dsr;
|
|
int ret;
|
|
|
|
STAT(copy_gpa);
|
|
if (gru_get_cpu_resources(GRU_NUM_KERNEL_DSR_BYTES, &cb, &dsr))
|
|
return MQE_BUG_NO_RESOURCES;
|
|
gru_bcopy(cb, src_gpa, dest_gpa, gru_get_tri(dsr),
|
|
XTYPE_B, bytes, GRU_NUM_KERNEL_DSR_CL, IMA);
|
|
ret = gru_wait(cb);
|
|
gru_free_cpu_resources(cb, dsr);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(gru_copy_gpa);
|
|
|
|
/* ------------------- KERNEL QUICKTESTS RUN AT STARTUP ----------------*/
|
|
/* Temp - will delete after we gain confidence in the GRU */
|
|
|
|
static int quicktest0(unsigned long arg)
|
|
{
|
|
unsigned long word0;
|
|
unsigned long word1;
|
|
void *cb;
|
|
void *dsr;
|
|
unsigned long *p;
|
|
int ret = -EIO;
|
|
|
|
if (gru_get_cpu_resources(GRU_CACHE_LINE_BYTES, &cb, &dsr))
|
|
return MQE_BUG_NO_RESOURCES;
|
|
p = dsr;
|
|
word0 = MAGIC;
|
|
word1 = 0;
|
|
|
|
gru_vload(cb, uv_gpa(&word0), gru_get_tri(dsr), XTYPE_DW, 1, 1, IMA);
|
|
if (gru_wait(cb) != CBS_IDLE) {
|
|
printk(KERN_DEBUG "GRU quicktest0: CBR failure 1\n");
|
|
goto done;
|
|
}
|
|
|
|
if (*p != MAGIC) {
|
|
printk(KERN_DEBUG "GRU: quicktest0 bad magic 0x%lx\n", *p);
|
|
goto done;
|
|
}
|
|
gru_vstore(cb, uv_gpa(&word1), gru_get_tri(dsr), XTYPE_DW, 1, 1, IMA);
|
|
if (gru_wait(cb) != CBS_IDLE) {
|
|
printk(KERN_DEBUG "GRU quicktest0: CBR failure 2\n");
|
|
goto done;
|
|
}
|
|
|
|
if (word0 != word1 || word1 != MAGIC) {
|
|
printk(KERN_DEBUG
|
|
"GRU quicktest0 err: found 0x%lx, expected 0x%lx\n",
|
|
word1, MAGIC);
|
|
goto done;
|
|
}
|
|
ret = 0;
|
|
|
|
done:
|
|
gru_free_cpu_resources(cb, dsr);
|
|
return ret;
|
|
}
|
|
|
|
#define ALIGNUP(p, q) ((void *)(((unsigned long)(p) + (q) - 1) & ~(q - 1)))
|
|
|
|
static int quicktest1(unsigned long arg)
|
|
{
|
|
struct gru_message_queue_desc mqd;
|
|
void *p, *mq;
|
|
unsigned long *dw;
|
|
int i, ret = -EIO;
|
|
char mes[GRU_CACHE_LINE_BYTES], *m;
|
|
|
|
/* Need 1K cacheline aligned that does not cross page boundary */
|
|
p = kmalloc(4096, 0);
|
|
if (p == NULL)
|
|
return -ENOMEM;
|
|
mq = ALIGNUP(p, 1024);
|
|
memset(mes, 0xee, sizeof(mes));
|
|
dw = mq;
|
|
|
|
gru_create_message_queue(&mqd, mq, 8 * GRU_CACHE_LINE_BYTES, 0, 0, 0);
|
|
for (i = 0; i < 6; i++) {
|
|
mes[8] = i;
|
|
do {
|
|
ret = gru_send_message_gpa(&mqd, mes, sizeof(mes));
|
|
} while (ret == MQE_CONGESTION);
|
|
if (ret)
|
|
break;
|
|
}
|
|
if (ret != MQE_QUEUE_FULL || i != 4)
|
|
goto done;
|
|
|
|
for (i = 0; i < 6; i++) {
|
|
m = gru_get_next_message(&mqd);
|
|
if (!m || m[8] != i)
|
|
break;
|
|
gru_free_message(&mqd, m);
|
|
}
|
|
ret = (i == 4) ? 0 : -EIO;
|
|
|
|
done:
|
|
kfree(p);
|
|
return ret;
|
|
}
|
|
|
|
static int quicktest2(unsigned long arg)
|
|
{
|
|
static DECLARE_COMPLETION(cmp);
|
|
unsigned long han;
|
|
int blade_id = 0;
|
|
int numcb = 4;
|
|
int ret = 0;
|
|
unsigned long *buf;
|
|
void *cb0, *cb;
|
|
int i, k, istatus, bytes;
|
|
|
|
bytes = numcb * 4 * 8;
|
|
buf = kmalloc(bytes, GFP_KERNEL);
|
|
if (!buf)
|
|
return -ENOMEM;
|
|
|
|
ret = -EBUSY;
|
|
han = gru_reserve_async_resources(blade_id, numcb, 0, &cmp);
|
|
if (!han)
|
|
goto done;
|
|
|
|
gru_lock_async_resource(han, &cb0, NULL);
|
|
memset(buf, 0xee, bytes);
|
|
for (i = 0; i < numcb; i++)
|
|
gru_vset(cb0 + i * GRU_HANDLE_STRIDE, uv_gpa(&buf[i * 4]), 0,
|
|
XTYPE_DW, 4, 1, IMA_INTERRUPT);
|
|
|
|
ret = 0;
|
|
for (k = 0; k < numcb; k++) {
|
|
gru_wait_async_cbr(han);
|
|
for (i = 0; i < numcb; i++) {
|
|
cb = cb0 + i * GRU_HANDLE_STRIDE;
|
|
istatus = gru_check_status(cb);
|
|
if (istatus == CBS_ACTIVE)
|
|
continue;
|
|
if (istatus == CBS_EXCEPTION)
|
|
ret = -EFAULT;
|
|
else if (buf[i] || buf[i + 1] || buf[i + 2] ||
|
|
buf[i + 3])
|
|
ret = -EIO;
|
|
}
|
|
}
|
|
BUG_ON(cmp.done);
|
|
|
|
gru_unlock_async_resource(han);
|
|
gru_release_async_resources(han);
|
|
done:
|
|
kfree(buf);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Debugging only. User hook for various kernel tests
|
|
* of driver & gru.
|
|
*/
|
|
int gru_ktest(unsigned long arg)
|
|
{
|
|
int ret = -EINVAL;
|
|
|
|
switch (arg & 0xff) {
|
|
case 0:
|
|
ret = quicktest0(arg);
|
|
break;
|
|
case 1:
|
|
ret = quicktest1(arg);
|
|
break;
|
|
case 2:
|
|
ret = quicktest2(arg);
|
|
break;
|
|
case 99:
|
|
ret = gru_free_kernel_contexts();
|
|
break;
|
|
}
|
|
return ret;
|
|
|
|
}
|
|
|
|
int gru_kservices_init(void)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
void gru_kservices_exit(void)
|
|
{
|
|
if (gru_free_kernel_contexts())
|
|
BUG();
|
|
}
|
|
|