litmus-rt.git - The LITMUS^RT kernel.

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author	David S. Miller <davem@sunset.davemloft.net>	2006-03-19 02:55:11 -0500
committer	David S. Miller <davem@sunset.davemloft.net>	2006-03-20 04:16:41 -0500
commit	bb8646d8340fa7c1b66a037428e39f85f8738f0a (patch)
tree	931d4505a0ba65124b662f0f8b5935e0b154bd66 /kernel/relay.c
parent	88d7079458f87d6f2d2261b2f87b7b9416019f5e (diff)

[SPARC64]: Optimized TSB table initialization.

We only need to write an invalid tag every 16 bytes, so taking advantage of this can save many instructions compared to the simple memset() call we make now. A prefetching implementation is implemented for sun4u and a block-init store version if implemented for Niagara. The next trick is to be able to perform an init and a copy_tsb() in parallel when growing a TSB table. Signed-off-by: David S. Miller <davem@davemloft.net>

Diffstat (limited to 'kernel/relay.c')

0 files changed, 0 insertions, 0 deletions

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#include <linux/kernel.h> #include <linux/module.h> #include <linux/backing-dev.h> #include <linux/bio.h> #include <linux/blkdev.h> #include <linux/mm.h> #include <linux/init.h> #include <linux/slab.h> #include <linux/workqueue.h> #include <linux/smp.h> #include <linux/blk-mq.h> #include "blk-mq.h" #include "blk-mq-tag.h" static void blk_mq_sysfs_release(struct kobject *kobj) { } static void blk_mq_hw_sysfs_release(struct kobject *kobj) { struct blk_mq_hw_ctx *hctx = container_of(kobj, struct blk_mq_hw_ctx, kobj); free_cpumask_var(hctx->cpumask); kfree(hctx->ctxs); kfree(hctx); } struct blk_mq_ctx_sysfs_entry { struct attribute attr; ssize_t (*show)(struct blk_mq_ctx *, char *); ssize_t (*store)(struct blk_mq_ctx *, const char *, size_t); }; struct blk_mq_hw_ctx_sysfs_entry { struct attribute attr; ssize_t (*show)(struct blk_mq_hw_ctx *, char *); ssize_t (*store)(struct blk_mq_hw_ctx *, const char *, size_t); }; static ssize_t blk_mq_sysfs_show(struct kobject *kobj, struct attribute *attr, char *page) { struct blk_mq_ctx_sysfs_entry *entry; struct blk_mq_ctx *ctx; struct request_queue *q; ssize_t res; entry = container_of(attr, struct blk_mq_ctx_sysfs_entry, attr); ctx = container_of(kobj, struct blk_mq_ctx, kobj); q = ctx->queue; if (!entry->show) return -EIO; res = -ENOENT; mutex_lock(&q->sysfs_lock); if (!blk_queue_dying(q)) res = entry->show(ctx, page); mutex_unlock(&q->sysfs_lock); return res; } static ssize_t blk_mq_sysfs_store(struct kobject *kobj, struct attribute *attr, const char *page, size_t length) { struct blk_mq_ctx_sysfs_entry *entry; struct blk_mq_ctx *ctx; struct request_queue *q; ssize_t res; entry = container_of(attr, struct blk_mq_ctx_sysfs_entry, attr); ctx = container_of(kobj, struct blk_mq_ctx, kobj); q = ctx->queue; if (!entry->store) return -EIO; res = -ENOENT; mutex_lock(&q->sysfs_lock); if (!blk_queue_dying(q)) res = entry->store(ctx, page, length); mutex_unlock(&q->sysfs_lock); return res; } static ssize_t blk_mq_hw_sysfs_show(struct kobject *kobj, struct attribute *attr, char *page) { struct blk_mq_hw_ctx_sysfs_entry *entry; struct blk_mq_hw_ctx *hctx; struct request_queue *q; ssize_t res; entry = container_of(attr, struct blk_mq_hw_ctx_sysfs_entry, attr); hctx = container_of(kobj, struct blk_mq_hw_ctx, kobj); q = hctx->queue; if (!entry->show) return -EIO; res = -ENOENT; mutex_lock(&q->sysfs_lock); if (!blk_queue_dying(q)) res = entry->show(hctx, page); mutex_unlock(&q->sysfs_lock); return res; } static ssize_t blk_mq_hw_sysfs_store(struct kobject *kobj, struct attribute *attr, const char *page, size_t length) { struct blk_mq_hw_ctx_sysfs_entry *entry; struct blk_mq_hw_ctx *hctx; struct request_queue *q; ssize_t res; entry = container_of(attr, struct blk_mq_hw_ctx_sysfs_entry, attr); hctx = container_of(kobj, struct blk_mq_hw_ctx, kobj); q = hctx->queue; if (!entry->store) return -EIO; res = -ENOENT; mutex_lock(&q->sysfs_lock); if (!blk_queue_dying(q)) res = entry->store(hctx, page, length); mutex_unlock(&q->sysfs_lock); return res; } static ssize_t blk_mq_hw_sysfs_nr_tags_show(struct blk_mq_hw_ctx *hctx, char *page) { return sprintf(page, "%u\n", hctx->tags->nr_tags); } static ssize_t blk_mq_hw_sysfs_nr_reserved_tags_show(struct blk_mq_hw_ctx *hctx, char *page) { return sprintf(page, "%u\n", hctx->tags->nr_reserved_tags); } static ssize_t blk_mq_hw_sysfs_cpus_show(struct blk_mq_hw_ctx *hctx, char *page) { unsigned int i, first = 1; ssize_t ret = 0; for_each_cpu(i, hctx->cpumask) { if (first) ret += sprintf(ret + page, "%u", i); else ret += sprintf(ret + page, ", %u", i); first = 0; } ret += sprintf(ret + page, "\n"); return ret; } static struct attribute *default_ctx_attrs[] = { NULL, }; static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_nr_tags = { .attr = {.name = "nr_tags", .mode = 0444 }, .show = blk_mq_hw_sysfs_nr_tags_show, }; static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_nr_reserved_tags = { .attr = {.name = "nr_reserved_tags", .mode = 0444 }, .show = blk_mq_hw_sysfs_nr_reserved_tags_show, }; static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_cpus = { .attr = {.name = "cpu_list", .mode = 0444 }, .show = blk_mq_hw_sysfs_cpus_show, }; static struct attribute *default_hw_ctx_attrs[] = { &blk_mq_hw_sysfs_nr_tags.attr, &blk_mq_hw_sysfs_nr_reserved_tags.attr, &blk_mq_hw_sysfs_cpus.attr, NULL, }; static const struct sysfs_ops blk_mq_sysfs_ops = { .show = blk_mq_sysfs_show, .store = blk_mq_sysfs_store, }; static const struct sysfs_ops blk_mq_hw_sysfs_ops = { .show = blk_mq_hw_sysfs_show, .store = blk_mq_hw_sysfs_store, }; static struct kobj_type blk_mq_ktype = { .sysfs_ops = &blk_mq_sysfs_ops, .release = blk_mq_sysfs_release, }; static struct kobj_type blk_mq_ctx_ktype = { .sysfs_ops = &blk_mq_sysfs_ops, .default_attrs = default_ctx_attrs, .release = blk_mq_sysfs_release, }; static struct kobj_type blk_mq_hw_ktype = { .sysfs_ops = &blk_mq_hw_sysfs_ops, .default_attrs = default_hw_ctx_attrs, .release = blk_mq_hw_sysfs_release, }; static void blk_mq_unregister_hctx(struct blk_mq_hw_ctx *hctx) { struct blk_mq_ctx *ctx; int i; if (!hctx->nr_ctx) return; hctx_for_each_ctx(hctx, ctx, i) kobject_del(&ctx->kobj); kobject_del(&hctx->kobj); } static int blk_mq_register_hctx(struct blk_mq_hw_ctx *hctx) { struct request_queue *q = hctx->queue; struct blk_mq_ctx *ctx; int i, ret; if (!hctx->nr_ctx) return 0; ret = kobject_add(&hctx->kobj, &q->mq_kobj, "%u", hctx->queue_num); if (ret) return ret; hctx_for_each_ctx(hctx, ctx, i) { ret = kobject_add(&ctx->kobj, &hctx->kobj, "cpu%u", ctx->cpu); if (ret) break; } return ret; } void blk_mq_unregister_dev(struct device *dev, struct request_queue *q) { struct blk_mq_hw_ctx *hctx; int i; lockdep_assert_held(&q->sysfs_lock); queue_for_each_hw_ctx(q, hctx, i) blk_mq_unregister_hctx(hctx); kobject_uevent(&q->mq_kobj, KOBJ_REMOVE); kobject_del(&q->mq_kobj); kobject_put(&dev->kobj); q->mq_sysfs_init_done = false; } void blk_mq_hctx_kobj_init(struct blk_mq_hw_ctx *hctx) { kobject_init(&hctx->kobj, &blk_mq_hw_ktype); } void blk_mq_sysfs_deinit(struct request_queue *q) { struct blk_mq_ctx *ctx; int cpu; for_each_possible_cpu(cpu) { ctx = per_cpu_ptr(q->queue_ctx, cpu); kobject_put(&ctx->kobj); } kobject_put(&q->mq_kobj); } void blk_mq_sysfs_init(struct request_queue *q) { struct blk_mq_ctx *ctx; int cpu; kobject_init(&q->mq_kobj, &blk_mq_ktype); for_each_possible_cpu(cpu) { ctx = per_cpu_ptr(q->queue_ctx, cpu); kobject_init(&ctx->kobj, &blk_mq_ctx_ktype); } } int __blk_mq_register_dev(struct device *dev, struct request_queue *q) { struct blk_mq_hw_ctx *hctx; int ret, i; WARN_ON_ONCE(!q->kobj.parent); lockdep_assert_held(&q->sysfs_lock); ret = kobject_add(&q->mq_kobj, kobject_get(&dev->kobj), "%s", "mq"); if (ret < 0) goto out; kobject_uevent(&q->mq_kobj, KOBJ_ADD); queue_for_each_hw_ctx(q, hctx, i) { ret = blk_mq_register_hctx(hctx); if (ret) goto unreg; } q->mq_sysfs_init_done = true; out: return ret; unreg: while (--i >= 0) blk_mq_unregister_hctx(q->queue_hw_ctx[i]); kobject_uevent(&q->mq_kobj, KOBJ_REMOVE); kobject_del(&q->mq_kobj); kobject_put(&dev->kobj); return ret; } int blk_mq_register_dev(struct device *dev, struct request_queue *q) { int ret; mutex_lock(&q->sysfs_lock); ret = __blk_mq_register_dev(dev, q); mutex_unlock(&q->sysfs_lock); return ret; } EXPORT_SYMBOL_GPL(blk_mq_register_dev); void blk_mq_sysfs_unregister(struct request_queue *q) { struct blk_mq_hw_ctx *hctx; int i; mutex_lock(&q->sysfs_lock); if (!q->mq_sysfs_init_done) goto unlock; queue_for_each_hw_ctx(q, hctx, i) blk_mq_unregister_hctx(hctx); unlock: mutex_unlock(&q->sysfs_lock); } int blk_mq_sysfs_register(struct request_queue *q) { struct blk_mq_hw_ctx *hctx; int i, ret = 0; mutex_lock(&q->sysfs_lock); if (!q->mq_sysfs_init_done) goto unlock; queue_for_each_hw_ctx(q, hctx, i) { ret = blk_mq_register_hctx(hctx); if (ret) break; } unlock: mutex_unlock(&q->sysfs_lock); return ret; }


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