503 lines
16 KiB
C
503 lines
16 KiB
C
/* Copyright 2009-2012 Freescale Semiconductor, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * Neither the name of Freescale Semiconductor nor the
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* names of its contributors may be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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*
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* ALTERNATIVELY, this software may be distributed under the terms of the
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* GNU General Public License ("GPL") as published by the Free Software
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* Foundation, either version 2 of that License or (at your option) any
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* later version.
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*
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* THIS SOFTWARE IS PROVIDED BY Freescale Semiconductor ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL Freescale Semiconductor BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <linux/kthread.h>
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#include <linux/platform_device.h>
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#include <linux/dma-mapping.h>
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#include "qman_test.h"
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/* Algorithm:
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*
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* Each cpu will have HP_PER_CPU "handlers" set up, each of which incorporates
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* an rx/tx pair of FQ objects (both of which are stashed on dequeue). The
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* organisation of FQIDs is such that the HP_PER_CPU*NUM_CPUS handlers will
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* shuttle a "hot potato" frame around them such that every forwarding action
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* moves it from one cpu to another. (The use of more than one handler per cpu
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* is to allow enough handlers/FQs to truly test the significance of caching -
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* ie. when cache-expiries are occurring.)
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*
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* The "hot potato" frame content will be HP_NUM_WORDS*4 bytes in size, and the
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* first and last words of the frame data will undergo a transformation step on
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* each forwarding action. To achieve this, each handler will be assigned a
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* 32-bit "mixer", that is produced using a 32-bit LFSR. When a frame is
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* received by a handler, the mixer of the expected sender is XOR'd into all
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* words of the entire frame, which is then validated against the original
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* values. Then, before forwarding, the entire frame is XOR'd with the mixer of
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* the current handler. Apart from validating that the frame is taking the
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* expected path, this also provides some quasi-realistic overheads to each
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* forwarding action - dereferencing *all* the frame data, computation, and
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* conditional branching. There is a "special" handler designated to act as the
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* instigator of the test by creating an enqueuing the "hot potato" frame, and
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* to determine when the test has completed by counting HP_LOOPS iterations.
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*
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* Init phases:
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*
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* 1. prepare each cpu's 'hp_cpu' struct using on_each_cpu(,,1) and link them
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* into 'hp_cpu_list'. Specifically, set processor_id, allocate HP_PER_CPU
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* handlers and link-list them (but do no other handler setup).
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*
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* 2. scan over 'hp_cpu_list' HP_PER_CPU times, the first time sets each
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* hp_cpu's 'iterator' to point to its first handler. With each loop,
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* allocate rx/tx FQIDs and mixer values to the hp_cpu's iterator handler
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* and advance the iterator for the next loop. This includes a final fixup,
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* which connects the last handler to the first (and which is why phase 2
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* and 3 are separate).
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*
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* 3. scan over 'hp_cpu_list' HP_PER_CPU times, the first time sets each
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* hp_cpu's 'iterator' to point to its first handler. With each loop,
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* initialise FQ objects and advance the iterator for the next loop.
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* Moreover, do this initialisation on the cpu it applies to so that Rx FQ
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* initialisation targets the correct cpu.
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*/
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/* helper to run something on all cpus (can't use on_each_cpu(), as that invokes
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* the fn from irq context, which is too restrictive). */
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struct bstrap {
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void (*fn)(void);
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atomic_t started;
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};
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static int bstrap_fn(void *__bstrap)
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{
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struct bstrap *bstrap = __bstrap;
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atomic_inc(&bstrap->started);
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bstrap->fn();
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while (!kthread_should_stop())
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msleep(1);
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return 0;
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}
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static int on_all_cpus(void (*fn)(void))
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{
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int cpu;
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for_each_cpu(cpu, cpu_online_mask) {
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struct bstrap bstrap = {
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.fn = fn,
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.started = ATOMIC_INIT(0)
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};
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struct task_struct *k = kthread_create(bstrap_fn, &bstrap,
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"hotpotato%d", cpu);
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int ret;
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if (IS_ERR(k))
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return -ENOMEM;
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kthread_bind(k, cpu);
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wake_up_process(k);
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/* If we call kthread_stop() before the "wake up" has had an
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* effect, then the thread may exit with -EINTR without ever
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* running the function. So poll until it's started before
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* requesting it to stop. */
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while (!atomic_read(&bstrap.started))
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msleep(10);
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ret = kthread_stop(k);
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if (ret)
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return ret;
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}
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return 0;
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}
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struct hp_handler {
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/* The following data is stashed when 'rx' is dequeued; */
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/* -------------- */
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/* The Rx FQ, dequeues of which will stash the entire hp_handler */
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struct qman_fq rx;
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/* The Tx FQ we should forward to */
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struct qman_fq tx;
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/* The value we XOR post-dequeue, prior to validating */
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u32 rx_mixer;
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/* The value we XOR pre-enqueue, after validating */
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u32 tx_mixer;
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/* what the hotpotato address should be on dequeue */
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dma_addr_t addr;
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u32 *frame_ptr;
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/* The following data isn't (necessarily) stashed on dequeue; */
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/* -------------- */
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u32 fqid_rx, fqid_tx;
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/* list node for linking us into 'hp_cpu' */
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struct list_head node;
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/* Just to check ... */
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unsigned int processor_id;
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} ____cacheline_aligned;
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struct hp_cpu {
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/* identify the cpu we run on; */
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unsigned int processor_id;
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/* root node for the per-cpu list of handlers */
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struct list_head handlers;
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/* list node for linking us into 'hp_cpu_list' */
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struct list_head node;
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/* when repeatedly scanning 'hp_list', each time linking the n'th
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* handlers together, this is used as per-cpu iterator state */
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struct hp_handler *iterator;
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};
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/* Each cpu has one of these */
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static DEFINE_PER_CPU(struct hp_cpu, hp_cpus);
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/* links together the hp_cpu structs, in first-come first-serve order. */
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static LIST_HEAD(hp_cpu_list);
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static spinlock_t hp_lock = __SPIN_LOCK_UNLOCKED(hp_lock);
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static unsigned int hp_cpu_list_length;
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/* the "special" handler, that starts and terminates the test. */
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static struct hp_handler *special_handler;
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static int loop_counter;
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/* handlers are allocated out of this, so they're properly aligned. */
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static struct kmem_cache *hp_handler_slab;
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/* this is the frame data */
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static void *__frame_ptr;
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static u32 *frame_ptr;
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static dma_addr_t frame_dma;
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/* the main function waits on this */
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static DECLARE_WAIT_QUEUE_HEAD(queue);
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#define HP_PER_CPU 2
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#define HP_LOOPS 8
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/* 80 bytes, like a small ethernet frame, and bleeds into a second cacheline */
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#define HP_NUM_WORDS 80
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/* First word of the LFSR-based frame data */
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#define HP_FIRST_WORD 0xabbaf00d
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static inline u32 do_lfsr(u32 prev)
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{
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return (prev >> 1) ^ (-(prev & 1u) & 0xd0000001u);
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}
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static void allocate_frame_data(void)
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{
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u32 lfsr = HP_FIRST_WORD;
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int loop;
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struct platform_device *pdev = platform_device_alloc("foobar", -1);
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if (!pdev)
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panic("platform_device_alloc() failed");
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if (platform_device_add(pdev))
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panic("platform_device_add() failed");
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__frame_ptr = kmalloc(4 * HP_NUM_WORDS, GFP_KERNEL);
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if (!__frame_ptr)
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panic("kmalloc() failed");
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frame_ptr = (void *)(((unsigned long)__frame_ptr + 63) &
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~(unsigned long)63);
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for (loop = 0; loop < HP_NUM_WORDS; loop++) {
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frame_ptr[loop] = lfsr;
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lfsr = do_lfsr(lfsr);
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}
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frame_dma = dma_map_single(&pdev->dev, frame_ptr, 4 * HP_NUM_WORDS,
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DMA_BIDIRECTIONAL);
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platform_device_del(pdev);
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platform_device_put(pdev);
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}
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static void deallocate_frame_data(void)
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{
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kfree(__frame_ptr);
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}
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static inline void process_frame_data(struct hp_handler *handler,
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const struct qm_fd *fd)
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{
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u32 *p = handler->frame_ptr;
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u32 lfsr = HP_FIRST_WORD;
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int loop;
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if (qm_fd_addr_get64(fd) != (handler->addr & 0xffffffffff)) {
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pr_err("Got 0x%llx expected 0x%llx\n",
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qm_fd_addr_get64(fd), handler->addr);
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panic("bad frame address");
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}
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for (loop = 0; loop < HP_NUM_WORDS; loop++, p++) {
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*p ^= handler->rx_mixer;
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if (*p != lfsr)
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panic("corrupt frame data");
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*p ^= handler->tx_mixer;
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lfsr = do_lfsr(lfsr);
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}
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}
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static enum qman_cb_dqrr_result normal_dqrr(struct qman_portal *portal,
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struct qman_fq *fq,
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const struct qm_dqrr_entry *dqrr)
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{
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struct hp_handler *handler = (struct hp_handler *)fq;
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process_frame_data(handler, &dqrr->fd);
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if (qman_enqueue(&handler->tx, &dqrr->fd, 0))
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panic("qman_enqueue() failed");
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return qman_cb_dqrr_consume;
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}
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static enum qman_cb_dqrr_result special_dqrr(struct qman_portal *portal,
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struct qman_fq *fq,
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const struct qm_dqrr_entry *dqrr)
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{
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struct hp_handler *handler = (struct hp_handler *)fq;
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process_frame_data(handler, &dqrr->fd);
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if (++loop_counter < HP_LOOPS) {
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if (qman_enqueue(&handler->tx, &dqrr->fd, 0))
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panic("qman_enqueue() failed");
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} else {
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pr_info("Received final (%dth) frame\n", loop_counter);
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wake_up(&queue);
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}
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return qman_cb_dqrr_consume;
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}
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static void create_per_cpu_handlers(void)
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{
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struct hp_handler *handler;
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int loop;
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struct hp_cpu *hp_cpu = &get_cpu_var(hp_cpus);
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hp_cpu->processor_id = smp_processor_id();
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spin_lock(&hp_lock);
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list_add_tail(&hp_cpu->node, &hp_cpu_list);
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hp_cpu_list_length++;
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spin_unlock(&hp_lock);
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INIT_LIST_HEAD(&hp_cpu->handlers);
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for (loop = 0; loop < HP_PER_CPU; loop++) {
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handler = kmem_cache_alloc(hp_handler_slab, GFP_KERNEL);
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if (!handler)
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panic("kmem_cache_alloc() failed");
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handler->processor_id = hp_cpu->processor_id;
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handler->addr = frame_dma;
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handler->frame_ptr = frame_ptr;
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list_add_tail(&handler->node, &hp_cpu->handlers);
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}
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put_cpu_var(hp_cpus);
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}
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static void destroy_per_cpu_handlers(void)
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{
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struct list_head *loop, *tmp;
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struct hp_cpu *hp_cpu = &get_cpu_var(hp_cpus);
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spin_lock(&hp_lock);
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list_del(&hp_cpu->node);
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spin_unlock(&hp_lock);
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list_for_each_safe(loop, tmp, &hp_cpu->handlers) {
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u32 flags;
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struct hp_handler *handler = list_entry(loop, struct hp_handler,
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node);
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if (qman_retire_fq(&handler->rx, &flags))
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panic("qman_retire_fq(rx) failed");
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BUG_ON(flags & QMAN_FQ_STATE_BLOCKOOS);
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if (qman_oos_fq(&handler->rx))
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panic("qman_oos_fq(rx) failed");
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qman_destroy_fq(&handler->rx, 0);
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qman_destroy_fq(&handler->tx, 0);
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qman_release_fqid(handler->fqid_rx);
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list_del(&handler->node);
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kmem_cache_free(hp_handler_slab, handler);
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}
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put_cpu_var(hp_cpus);
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}
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static inline u8 num_cachelines(u32 offset)
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{
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u8 res = (offset + (L1_CACHE_BYTES - 1))
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/ (L1_CACHE_BYTES);
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if (res > 3)
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return 3;
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return res;
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}
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#define STASH_DATA_CL \
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num_cachelines(HP_NUM_WORDS * 4)
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#define STASH_CTX_CL \
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num_cachelines(offsetof(struct hp_handler, fqid_rx))
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static void init_handler(void *__handler)
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{
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struct qm_mcc_initfq opts;
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struct hp_handler *handler = __handler;
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BUG_ON(handler->processor_id != smp_processor_id());
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/* Set up rx */
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memset(&handler->rx, 0, sizeof(handler->rx));
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if (handler == special_handler)
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handler->rx.cb.dqrr = special_dqrr;
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else
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handler->rx.cb.dqrr = normal_dqrr;
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if (qman_create_fq(handler->fqid_rx, 0, &handler->rx))
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panic("qman_create_fq(rx) failed");
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memset(&opts, 0, sizeof(opts));
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opts.we_mask = QM_INITFQ_WE_FQCTRL | QM_INITFQ_WE_CONTEXTA;
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opts.fqd.fq_ctrl = QM_FQCTRL_CTXASTASHING;
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opts.fqd.context_a.stashing.data_cl = STASH_DATA_CL;
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opts.fqd.context_a.stashing.context_cl = STASH_CTX_CL;
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if (qman_init_fq(&handler->rx, QMAN_INITFQ_FLAG_SCHED |
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QMAN_INITFQ_FLAG_LOCAL, &opts))
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panic("qman_init_fq(rx) failed");
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/* Set up tx */
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memset(&handler->tx, 0, sizeof(handler->tx));
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if (qman_create_fq(handler->fqid_tx, QMAN_FQ_FLAG_NO_MODIFY,
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&handler->tx))
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panic("qman_create_fq(tx) failed");
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}
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static void init_phase2(void)
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{
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int loop;
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u32 fqid = 0;
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u32 lfsr = 0xdeadbeef;
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struct hp_cpu *hp_cpu;
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struct hp_handler *handler;
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for (loop = 0; loop < HP_PER_CPU; loop++) {
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list_for_each_entry(hp_cpu, &hp_cpu_list, node) {
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int ret;
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if (!loop)
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hp_cpu->iterator = list_first_entry(
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&hp_cpu->handlers,
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struct hp_handler, node);
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else
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hp_cpu->iterator = list_entry(
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hp_cpu->iterator->node.next,
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struct hp_handler, node);
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/* Rx FQID is the previous handler's Tx FQID */
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hp_cpu->iterator->fqid_rx = fqid;
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/* Allocate new FQID for Tx */
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ret = qman_alloc_fqid(&fqid);
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if (ret)
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panic("qman_alloc_fqid() failed");
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hp_cpu->iterator->fqid_tx = fqid;
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/* Rx mixer is the previous handler's Tx mixer */
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hp_cpu->iterator->rx_mixer = lfsr;
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/* Get new mixer for Tx */
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lfsr = do_lfsr(lfsr);
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hp_cpu->iterator->tx_mixer = lfsr;
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}
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}
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/* Fix up the first handler (fqid_rx==0, rx_mixer=0xdeadbeef) */
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hp_cpu = list_first_entry(&hp_cpu_list, struct hp_cpu, node);
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handler = list_first_entry(&hp_cpu->handlers, struct hp_handler, node);
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BUG_ON((handler->fqid_rx != 0) || (handler->rx_mixer != 0xdeadbeef));
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handler->fqid_rx = fqid;
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handler->rx_mixer = lfsr;
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/* and tag it as our "special" handler */
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special_handler = handler;
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}
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static void init_phase3(void)
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{
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int loop;
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struct hp_cpu *hp_cpu;
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for (loop = 0; loop < HP_PER_CPU; loop++) {
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list_for_each_entry(hp_cpu, &hp_cpu_list, node) {
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if (!loop)
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hp_cpu->iterator = list_first_entry(
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&hp_cpu->handlers,
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struct hp_handler, node);
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else
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hp_cpu->iterator = list_entry(
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hp_cpu->iterator->node.next,
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struct hp_handler, node);
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preempt_disable();
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if (hp_cpu->processor_id == smp_processor_id())
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init_handler(hp_cpu->iterator);
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else
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smp_call_function_single(hp_cpu->processor_id,
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init_handler, hp_cpu->iterator, 1);
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preempt_enable();
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}
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}
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}
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static void send_first_frame(void *ignore)
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{
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u32 *p = special_handler->frame_ptr;
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u32 lfsr = HP_FIRST_WORD;
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int loop;
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struct qm_fd fd;
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BUG_ON(special_handler->processor_id != smp_processor_id());
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memset(&fd, 0, sizeof(fd));
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qm_fd_addr_set64(&fd, special_handler->addr);
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fd.format = qm_fd_contig_big;
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fd.length29 = HP_NUM_WORDS * 4;
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for (loop = 0; loop < HP_NUM_WORDS; loop++, p++) {
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if (*p != lfsr)
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panic("corrupt frame data");
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*p ^= special_handler->tx_mixer;
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lfsr = do_lfsr(lfsr);
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}
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pr_info("Sending first frame\n");
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if (qman_enqueue(&special_handler->tx, &fd, 0))
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panic("qman_enqueue() failed");
|
|
}
|
|
|
|
void qman_test_hotpotato(void)
|
|
{
|
|
if (cpumask_weight(cpu_online_mask) < 2) {
|
|
pr_info("qman_test_hotpotato, skip - only 1 CPU\n");
|
|
return;
|
|
}
|
|
|
|
pr_info("qman_test_hotpotato starting\n");
|
|
|
|
hp_cpu_list_length = 0;
|
|
loop_counter = 0;
|
|
hp_handler_slab = kmem_cache_create("hp_handler_slab",
|
|
sizeof(struct hp_handler), L1_CACHE_BYTES,
|
|
SLAB_HWCACHE_ALIGN, NULL);
|
|
if (!hp_handler_slab)
|
|
panic("kmem_cache_create() failed");
|
|
|
|
allocate_frame_data();
|
|
|
|
/* Init phase 1 */
|
|
pr_info("Creating %d handlers per cpu...\n", HP_PER_CPU);
|
|
if (on_all_cpus(create_per_cpu_handlers))
|
|
panic("on_each_cpu() failed");
|
|
pr_info("Number of cpus: %d, total of %d handlers\n",
|
|
hp_cpu_list_length, hp_cpu_list_length * HP_PER_CPU);
|
|
|
|
init_phase2();
|
|
|
|
init_phase3();
|
|
|
|
preempt_disable();
|
|
if (special_handler->processor_id == smp_processor_id())
|
|
send_first_frame(NULL);
|
|
else
|
|
smp_call_function_single(special_handler->processor_id,
|
|
send_first_frame, NULL, 1);
|
|
preempt_enable();
|
|
|
|
wait_event(queue, loop_counter == HP_LOOPS);
|
|
deallocate_frame_data();
|
|
if (on_all_cpus(destroy_per_cpu_handlers))
|
|
panic("on_each_cpu() failed");
|
|
kmem_cache_destroy(hp_handler_slab);
|
|
pr_info("qman_test_hotpotato finished\n");
|
|
}
|