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authorLinus Torvalds <torvalds@linux-foundation.org>2016-01-23 18:45:06 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2016-01-23 18:45:06 -0800
commit048ccca8c1c8f583deec3367d7df521bb1f542ae (patch)
treeefa882c88f658f711d63581a3063203c63682338 /block
parentb3e27d5d4a29bcc8e057b496d5ef5194addaaac0 (diff)
parent34356f64ac0df2326fa50e2d4bca6f7c03ed16c1 (diff)
downloadlinux-sh-048ccca8c1c8f583deec3367d7df521bb1f542ae.tar.gz
Merge tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dledford/rdma
Pull rdma updates from Doug Ledford: "Initial roundup of 4.5 merge window patches - Remove usage of ib_query_device and instead store attributes in ib_device struct - Move iopoll out of block and into lib, rename to irqpoll, and use in several places in the rdma stack as our new completion queue polling library mechanism. Update the other block drivers that already used iopoll to use the new mechanism too. - Replace the per-entry GID table locks with a single GID table lock - IPoIB multicast cleanup - Cleanups to the IB MR facility - Add support for 64bit extended IB counters - Fix for netlink oops while parsing RDMA nl messages - RoCEv2 support for the core IB code - mlx4 RoCEv2 support - mlx5 RoCEv2 support - Cross Channel support for mlx5 - Timestamp support for mlx5 - Atomic support for mlx5 - Raw QP support for mlx5 - MAINTAINERS update for mlx4/mlx5 - Misc ocrdma, qib, nes, usNIC, cxgb3, cxgb4, mlx4, mlx5 updates - Add support for remote invalidate to the iSER driver (pushed through the RDMA tree due to dependencies, acknowledged by nab) - Update to NFSoRDMA (pushed through the RDMA tree due to dependencies, acknowledged by Bruce)" * tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dledford/rdma: (169 commits) IB/mlx5: Unify CQ create flags check IB/mlx5: Expose Raw Packet QP to user space consumers {IB, net}/mlx5: Move the modify QP operation table to mlx5_ib IB/mlx5: Support setting Ethernet priority for Raw Packet QPs IB/mlx5: Add Raw Packet QP query functionality IB/mlx5: Add create and destroy functionality for Raw Packet QP IB/mlx5: Refactor mlx5_ib_qp to accommodate other QP types IB/mlx5: Allocate a Transport Domain for each ucontext net/mlx5_core: Warn on unsupported events of QP/RQ/SQ net/mlx5_core: Add RQ and SQ event handling net/mlx5_core: Export transport objects IB/mlx5: Expose CQE version to user-space IB/mlx5: Add CQE version 1 support to user QPs and SRQs IB/mlx5: Fix data validation in mlx5_ib_alloc_ucontext IB/sa: Fix netlink local service GFP crash IB/srpt: Remove redundant wc array IB/qib: Improve ipoib UD performance IB/mlx4: Advertise RoCE v2 support IB/mlx4: Create and use another QP1 for RoCEv2 IB/mlx4: Enable send of RoCE QP1 packets with IP/UDP headers ...
Diffstat (limited to 'block')
-rw-r--r--block/Makefile2
-rw-r--r--block/blk-iopoll.c224
2 files changed, 1 insertions, 225 deletions
diff --git a/block/Makefile b/block/Makefile
index db5f622c9d67..9eda2322b2d4 100644
--- a/block/Makefile
+++ b/block/Makefile
@@ -5,7 +5,7 @@
obj-$(CONFIG_BLOCK) := bio.o elevator.o blk-core.o blk-tag.o blk-sysfs.o \
blk-flush.o blk-settings.o blk-ioc.o blk-map.o \
blk-exec.o blk-merge.o blk-softirq.o blk-timeout.o \
- blk-iopoll.o blk-lib.o blk-mq.o blk-mq-tag.o \
+ blk-lib.o blk-mq.o blk-mq-tag.o \
blk-mq-sysfs.o blk-mq-cpu.o blk-mq-cpumap.o ioctl.o \
genhd.o scsi_ioctl.o partition-generic.o ioprio.o \
badblocks.o partitions/
diff --git a/block/blk-iopoll.c b/block/blk-iopoll.c
deleted file mode 100644
index 0736729d6494..000000000000
--- a/block/blk-iopoll.c
+++ /dev/null
@@ -1,224 +0,0 @@
-/*
- * Functions related to interrupt-poll handling in the block layer. This
- * is similar to NAPI for network devices.
- */
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/init.h>
-#include <linux/bio.h>
-#include <linux/blkdev.h>
-#include <linux/interrupt.h>
-#include <linux/cpu.h>
-#include <linux/blk-iopoll.h>
-#include <linux/delay.h>
-
-#include "blk.h"
-
-static unsigned int blk_iopoll_budget __read_mostly = 256;
-
-static DEFINE_PER_CPU(struct list_head, blk_cpu_iopoll);
-
-/**
- * blk_iopoll_sched - Schedule a run of the iopoll handler
- * @iop: The parent iopoll structure
- *
- * Description:
- * Add this blk_iopoll structure to the pending poll list and trigger the
- * raise of the blk iopoll softirq. The driver must already have gotten a
- * successful return from blk_iopoll_sched_prep() before calling this.
- **/
-void blk_iopoll_sched(struct blk_iopoll *iop)
-{
- unsigned long flags;
-
- local_irq_save(flags);
- list_add_tail(&iop->list, this_cpu_ptr(&blk_cpu_iopoll));
- __raise_softirq_irqoff(BLOCK_IOPOLL_SOFTIRQ);
- local_irq_restore(flags);
-}
-EXPORT_SYMBOL(blk_iopoll_sched);
-
-/**
- * __blk_iopoll_complete - Mark this @iop as un-polled again
- * @iop: The parent iopoll structure
- *
- * Description:
- * See blk_iopoll_complete(). This function must be called with interrupts
- * disabled.
- **/
-void __blk_iopoll_complete(struct blk_iopoll *iop)
-{
- list_del(&iop->list);
- smp_mb__before_atomic();
- clear_bit_unlock(IOPOLL_F_SCHED, &iop->state);
-}
-EXPORT_SYMBOL(__blk_iopoll_complete);
-
-/**
- * blk_iopoll_complete - Mark this @iop as un-polled again
- * @iop: The parent iopoll structure
- *
- * Description:
- * If a driver consumes less than the assigned budget in its run of the
- * iopoll handler, it'll end the polled mode by calling this function. The
- * iopoll handler will not be invoked again before blk_iopoll_sched_prep()
- * is called.
- **/
-void blk_iopoll_complete(struct blk_iopoll *iop)
-{
- unsigned long flags;
-
- local_irq_save(flags);
- __blk_iopoll_complete(iop);
- local_irq_restore(flags);
-}
-EXPORT_SYMBOL(blk_iopoll_complete);
-
-static void blk_iopoll_softirq(struct softirq_action *h)
-{
- struct list_head *list = this_cpu_ptr(&blk_cpu_iopoll);
- int rearm = 0, budget = blk_iopoll_budget;
- unsigned long start_time = jiffies;
-
- local_irq_disable();
-
- while (!list_empty(list)) {
- struct blk_iopoll *iop;
- int work, weight;
-
- /*
- * If softirq window is exhausted then punt.
- */
- if (budget <= 0 || time_after(jiffies, start_time)) {
- rearm = 1;
- break;
- }
-
- local_irq_enable();
-
- /* Even though interrupts have been re-enabled, this
- * access is safe because interrupts can only add new
- * entries to the tail of this list, and only ->poll()
- * calls can remove this head entry from the list.
- */
- iop = list_entry(list->next, struct blk_iopoll, list);
-
- weight = iop->weight;
- work = 0;
- if (test_bit(IOPOLL_F_SCHED, &iop->state))
- work = iop->poll(iop, weight);
-
- budget -= work;
-
- local_irq_disable();
-
- /*
- * Drivers must not modify the iopoll state, if they
- * consume their assigned weight (or more, some drivers can't
- * easily just stop processing, they have to complete an
- * entire mask of commands).In such cases this code
- * still "owns" the iopoll instance and therefore can
- * move the instance around on the list at-will.
- */
- if (work >= weight) {
- if (blk_iopoll_disable_pending(iop))
- __blk_iopoll_complete(iop);
- else
- list_move_tail(&iop->list, list);
- }
- }
-
- if (rearm)
- __raise_softirq_irqoff(BLOCK_IOPOLL_SOFTIRQ);
-
- local_irq_enable();
-}
-
-/**
- * blk_iopoll_disable - Disable iopoll on this @iop
- * @iop: The parent iopoll structure
- *
- * Description:
- * Disable io polling and wait for any pending callbacks to have completed.
- **/
-void blk_iopoll_disable(struct blk_iopoll *iop)
-{
- set_bit(IOPOLL_F_DISABLE, &iop->state);
- while (test_and_set_bit(IOPOLL_F_SCHED, &iop->state))
- msleep(1);
- clear_bit(IOPOLL_F_DISABLE, &iop->state);
-}
-EXPORT_SYMBOL(blk_iopoll_disable);
-
-/**
- * blk_iopoll_enable - Enable iopoll on this @iop
- * @iop: The parent iopoll structure
- *
- * Description:
- * Enable iopoll on this @iop. Note that the handler run will not be
- * scheduled, it will only mark it as active.
- **/
-void blk_iopoll_enable(struct blk_iopoll *iop)
-{
- BUG_ON(!test_bit(IOPOLL_F_SCHED, &iop->state));
- smp_mb__before_atomic();
- clear_bit_unlock(IOPOLL_F_SCHED, &iop->state);
-}
-EXPORT_SYMBOL(blk_iopoll_enable);
-
-/**
- * blk_iopoll_init - Initialize this @iop
- * @iop: The parent iopoll structure
- * @weight: The default weight (or command completion budget)
- * @poll_fn: The handler to invoke
- *
- * Description:
- * Initialize this blk_iopoll structure. Before being actively used, the
- * driver must call blk_iopoll_enable().
- **/
-void blk_iopoll_init(struct blk_iopoll *iop, int weight, blk_iopoll_fn *poll_fn)
-{
- memset(iop, 0, sizeof(*iop));
- INIT_LIST_HEAD(&iop->list);
- iop->weight = weight;
- iop->poll = poll_fn;
- set_bit(IOPOLL_F_SCHED, &iop->state);
-}
-EXPORT_SYMBOL(blk_iopoll_init);
-
-static int blk_iopoll_cpu_notify(struct notifier_block *self,
- unsigned long action, void *hcpu)
-{
- /*
- * If a CPU goes away, splice its entries to the current CPU
- * and trigger a run of the softirq
- */
- if (action == CPU_DEAD || action == CPU_DEAD_FROZEN) {
- int cpu = (unsigned long) hcpu;
-
- local_irq_disable();
- list_splice_init(&per_cpu(blk_cpu_iopoll, cpu),
- this_cpu_ptr(&blk_cpu_iopoll));
- __raise_softirq_irqoff(BLOCK_IOPOLL_SOFTIRQ);
- local_irq_enable();
- }
-
- return NOTIFY_OK;
-}
-
-static struct notifier_block blk_iopoll_cpu_notifier = {
- .notifier_call = blk_iopoll_cpu_notify,
-};
-
-static __init int blk_iopoll_setup(void)
-{
- int i;
-
- for_each_possible_cpu(i)
- INIT_LIST_HEAD(&per_cpu(blk_cpu_iopoll, i));
-
- open_softirq(BLOCK_IOPOLL_SOFTIRQ, blk_iopoll_softirq);
- register_hotcpu_notifier(&blk_iopoll_cpu_notifier);
- return 0;
-}
-subsys_initcall(blk_iopoll_setup);