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Message-ID: <1474556652-5044-5-git-send-email-claudiu.manoil@nxp.com>
Date: Thu, 22 Sep 2016 18:04:11 +0300
From: Claudiu Manoil <claudiu.manoil@....com>
To: <linuxppc-dev@...ts.ozlabs.org>, <scottwood@...escale.com>
CC: <linux-kernel@...r.kernel.org>, Scott Wood <oss@...error.net>,
Roy Pledge <roy.pledge@....com>
Subject: [PATCH v2 4/5] soc/qman: Add self-test for QMan driver
Add self tests for the DPAA 1.x Queue Manager driver. The tests
ensure that the driver can properly enqueue and dequeue to/from
frame queues using the QMan portal infrastructure.
Signed-off-by: Roy Pledge <roy.pledge@....com>
Signed-off-by: Claudiu Manoil <claudiu.manoil@....com>
---
v2: none
drivers/soc/fsl/qbman/Kconfig | 23 ++
drivers/soc/fsl/qbman/Makefile | 5 +
drivers/soc/fsl/qbman/qman_test.c | 62 ++++
drivers/soc/fsl/qbman/qman_test.h | 36 ++
drivers/soc/fsl/qbman/qman_test_api.c | 252 +++++++++++++
drivers/soc/fsl/qbman/qman_test_stash.c | 617 ++++++++++++++++++++++++++++++++
6 files changed, 995 insertions(+)
create mode 100644 drivers/soc/fsl/qbman/qman_test.c
create mode 100644 drivers/soc/fsl/qbman/qman_test.h
create mode 100644 drivers/soc/fsl/qbman/qman_test_api.c
create mode 100644 drivers/soc/fsl/qbman/qman_test_stash.c
diff --git a/drivers/soc/fsl/qbman/Kconfig b/drivers/soc/fsl/qbman/Kconfig
index e6da6a2..757033c 100644
--- a/drivers/soc/fsl/qbman/Kconfig
+++ b/drivers/soc/fsl/qbman/Kconfig
@@ -41,4 +41,27 @@ config FSL_BMAN_TEST_API
high-level API testing with them (whichever portal(s) are affine
to the cpu(s) the test executes on).
+config FSL_QMAN_TEST
+ tristate "QMan self-tests"
+ help
+ Compile self-test code for QMan.
+
+config FSL_QMAN_TEST_API
+ bool "QMan high-level self-test"
+ depends on FSL_QMAN_TEST
+ default y
+ help
+ This requires the presence of cpu-affine portals, and performs
+ high-level API testing with them (whichever portal(s) are affine to
+ the cpu(s) the test executes on).
+
+config FSL_QMAN_TEST_STASH
+ bool "QMan 'hot potato' data-stashing self-test"
+ depends on FSL_QMAN_TEST
+ default y
+ help
+ This performs a "hot potato" style test enqueuing/dequeuing a frame
+ across a series of FQs scheduled to different portals (and cpus), with
+ DQRR, data and context stashing always on.
+
endif # FSL_DPAA
diff --git a/drivers/soc/fsl/qbman/Makefile b/drivers/soc/fsl/qbman/Makefile
index 714dd97..7ae199f 100644
--- a/drivers/soc/fsl/qbman/Makefile
+++ b/drivers/soc/fsl/qbman/Makefile
@@ -5,3 +5,8 @@ obj-$(CONFIG_FSL_DPAA) += bman_ccsr.o qman_ccsr.o \
obj-$(CONFIG_FSL_BMAN_TEST) += bman-test.o
bman-test-y = bman_test.o
bman-test-$(CONFIG_FSL_BMAN_TEST_API) += bman_test_api.o
+
+obj-$(CONFIG_FSL_QMAN_TEST) += qman-test.o
+qman-test-y = qman_test.o
+qman-test-$(CONFIG_FSL_QMAN_TEST_API) += qman_test_api.o
+qman-test-$(CONFIG_FSL_QMAN_TEST_STASH) += qman_test_stash.o
diff --git a/drivers/soc/fsl/qbman/qman_test.c b/drivers/soc/fsl/qbman/qman_test.c
new file mode 100644
index 0000000..18f7f02
--- /dev/null
+++ b/drivers/soc/fsl/qbman/qman_test.c
@@ -0,0 +1,62 @@
+/* Copyright 2008 - 2016 Freescale Semiconductor, Inc.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * * Neither the name of Freescale Semiconductor nor the
+ * names of its contributors may be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * ALTERNATIVELY, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL") as published by the Free Software
+ * Foundation, either version 2 of that License or (at your option) any
+ * later version.
+ *
+ * THIS SOFTWARE IS PROVIDED BY Freescale Semiconductor ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL Freescale Semiconductor BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "qman_test.h"
+
+MODULE_AUTHOR("Geoff Thorpe");
+MODULE_LICENSE("Dual BSD/GPL");
+MODULE_DESCRIPTION("QMan testing");
+
+static int test_init(void)
+{
+ int loop = 1;
+ int err = 0;
+
+ while (loop--) {
+#ifdef CONFIG_FSL_QMAN_TEST_STASH
+ err = qman_test_stash();
+ if (err)
+ break;
+#endif
+#ifdef CONFIG_FSL_QMAN_TEST_API
+ err = qman_test_api();
+ if (err)
+ break;
+#endif
+ }
+ return err;
+}
+
+static void test_exit(void)
+{
+}
+
+module_init(test_init);
+module_exit(test_exit);
diff --git a/drivers/soc/fsl/qbman/qman_test.h b/drivers/soc/fsl/qbman/qman_test.h
new file mode 100644
index 0000000..d5f8cb2
--- /dev/null
+++ b/drivers/soc/fsl/qbman/qman_test.h
@@ -0,0 +1,36 @@
+/* Copyright 2008 - 2016 Freescale Semiconductor, Inc.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * * Neither the name of Freescale Semiconductor nor the
+ * names of its contributors may be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * ALTERNATIVELY, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL") as published by the Free Software
+ * Foundation, either version 2 of that License or (at your option) any
+ * later version.
+ *
+ * THIS SOFTWARE IS PROVIDED BY Freescale Semiconductor ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL Freescale Semiconductor BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "qman_priv.h"
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+int qman_test_stash(void);
+int qman_test_api(void);
diff --git a/drivers/soc/fsl/qbman/qman_test_api.c b/drivers/soc/fsl/qbman/qman_test_api.c
new file mode 100644
index 0000000..6880ff1
--- /dev/null
+++ b/drivers/soc/fsl/qbman/qman_test_api.c
@@ -0,0 +1,252 @@
+/* Copyright 2008 - 2016 Freescale Semiconductor, Inc.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * * Neither the name of Freescale Semiconductor nor the
+ * names of its contributors may be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * ALTERNATIVELY, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL") as published by the Free Software
+ * Foundation, either version 2 of that License or (at your option) any
+ * later version.
+ *
+ * THIS SOFTWARE IS PROVIDED BY Freescale Semiconductor ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL Freescale Semiconductor BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "qman_test.h"
+
+#define CGR_ID 27
+#define POOL_ID 2
+#define FQ_FLAGS QMAN_FQ_FLAG_DYNAMIC_FQID
+#define NUM_ENQUEUES 10
+#define NUM_PARTIAL 4
+#define PORTAL_SDQCR (QM_SDQCR_SOURCE_CHANNELS | \
+ QM_SDQCR_TYPE_PRIO_QOS | \
+ QM_SDQCR_TOKEN_SET(0x98) | \
+ QM_SDQCR_CHANNELS_DEDICATED | \
+ QM_SDQCR_CHANNELS_POOL(POOL_ID))
+#define PORTAL_OPAQUE ((void *)0xf00dbeef)
+#define VDQCR_FLAGS (QMAN_VOLATILE_FLAG_WAIT | QMAN_VOLATILE_FLAG_FINISH)
+
+static enum qman_cb_dqrr_result cb_dqrr(struct qman_portal *,
+ struct qman_fq *,
+ const struct qm_dqrr_entry *);
+static void cb_ern(struct qman_portal *, struct qman_fq *,
+ const union qm_mr_entry *);
+static void cb_fqs(struct qman_portal *, struct qman_fq *,
+ const union qm_mr_entry *);
+
+static struct qm_fd fd, fd_dq;
+static struct qman_fq fq_base = {
+ .cb.dqrr = cb_dqrr,
+ .cb.ern = cb_ern,
+ .cb.fqs = cb_fqs
+};
+static DECLARE_WAIT_QUEUE_HEAD(waitqueue);
+static int retire_complete, sdqcr_complete;
+
+/* Helpers for initialising and "incrementing" a frame descriptor */
+static void fd_init(struct qm_fd *fd)
+{
+ qm_fd_addr_set64(fd, 0xabdeadbeefLLU);
+ qm_fd_set_contig_big(fd, 0x0000ffff);
+ fd->cmd = 0xfeedf00d;
+}
+
+static void fd_inc(struct qm_fd *fd)
+{
+ u64 t = qm_fd_addr_get64(fd);
+ int z = t >> 40;
+ unsigned int len, off;
+ enum qm_fd_format fmt;
+
+ t <<= 1;
+ if (z)
+ t |= 1;
+ qm_fd_addr_set64(fd, t);
+
+ fmt = qm_fd_get_format(fd);
+ off = qm_fd_get_offset(fd);
+ len = qm_fd_get_length(fd);
+ len--;
+ qm_fd_set_param(fd, fmt, off, len);
+
+ fd->cmd++;
+}
+
+/* The only part of the 'fd' we can't memcmp() is the ppid */
+static int fd_cmp(const struct qm_fd *a, const struct qm_fd *b)
+{
+ int r = (qm_fd_addr_get64(a) == qm_fd_addr_get64(b)) ? 0 : -1;
+
+ if (!r) {
+ enum qm_fd_format fmt_a, fmt_b;
+
+ fmt_a = qm_fd_get_format(a);
+ fmt_b = qm_fd_get_format(b);
+ r = fmt_a - fmt_b;
+ }
+ if (!r)
+ r = a->cfg - b->cfg;
+ if (!r)
+ r = a->cmd - b->cmd;
+ return r;
+}
+
+/* test */
+static int do_enqueues(struct qman_fq *fq)
+{
+ unsigned int loop;
+ int err = 0;
+
+ for (loop = 0; loop < NUM_ENQUEUES; loop++) {
+ if (qman_enqueue(fq, &fd)) {
+ pr_crit("qman_enqueue() failed\n");
+ err = -EIO;
+ }
+ fd_inc(&fd);
+ }
+
+ return err;
+}
+
+int qman_test_api(void)
+{
+ unsigned int flags, frmcnt;
+ int err;
+ struct qman_fq *fq = &fq_base;
+
+ pr_info("%s(): Starting\n", __func__);
+ fd_init(&fd);
+ fd_init(&fd_dq);
+
+ /* Initialise (parked) FQ */
+ err = qman_create_fq(0, FQ_FLAGS, fq);
+ if (err) {
+ pr_crit("qman_create_fq() failed\n");
+ goto failed;
+ }
+ err = qman_init_fq(fq, QMAN_INITFQ_FLAG_LOCAL, NULL);
+ if (err) {
+ pr_crit("qman_init_fq() failed\n");
+ goto failed;
+ }
+ /* Do enqueues + VDQCR, twice. (Parked FQ) */
+ err = do_enqueues(fq);
+ if (err)
+ goto failed;
+ pr_info("VDQCR (till-empty);\n");
+ frmcnt = QM_VDQCR_NUMFRAMES_TILLEMPTY;
+ err = qman_volatile_dequeue(fq, VDQCR_FLAGS, frmcnt);
+ if (err) {
+ pr_crit("qman_volatile_dequeue() failed\n");
+ goto failed;
+ }
+ err = do_enqueues(fq);
+ if (err)
+ goto failed;
+ pr_info("VDQCR (%d of %d);\n", NUM_PARTIAL, NUM_ENQUEUES);
+ frmcnt = QM_VDQCR_NUMFRAMES_SET(NUM_PARTIAL);
+ err = qman_volatile_dequeue(fq, VDQCR_FLAGS, frmcnt);
+ if (err) {
+ pr_crit("qman_volatile_dequeue() failed\n");
+ goto failed;
+ }
+ pr_info("VDQCR (%d of %d);\n", NUM_ENQUEUES - NUM_PARTIAL,
+ NUM_ENQUEUES);
+ frmcnt = QM_VDQCR_NUMFRAMES_SET(NUM_ENQUEUES - NUM_PARTIAL);
+ err = qman_volatile_dequeue(fq, VDQCR_FLAGS, frmcnt);
+ if (err) {
+ pr_err("qman_volatile_dequeue() failed\n");
+ goto failed;
+ }
+
+ err = do_enqueues(fq);
+ if (err)
+ goto failed;
+ pr_info("scheduled dequeue (till-empty)\n");
+ err = qman_schedule_fq(fq);
+ if (err) {
+ pr_crit("qman_schedule_fq() failed\n");
+ goto failed;
+ }
+ wait_event(waitqueue, sdqcr_complete);
+
+ /* Retire and OOS the FQ */
+ err = qman_retire_fq(fq, &flags);
+ if (err < 0) {
+ pr_crit("qman_retire_fq() failed\n");
+ goto failed;
+ }
+ wait_event(waitqueue, retire_complete);
+ if (flags & QMAN_FQ_STATE_BLOCKOOS) {
+ err = -EIO;
+ pr_crit("leaking frames\n");
+ goto failed;
+ }
+ err = qman_oos_fq(fq);
+ if (err) {
+ pr_crit("qman_oos_fq() failed\n");
+ goto failed;
+ }
+ qman_destroy_fq(fq);
+ pr_info("%s(): Finished\n", __func__);
+ return 0;
+
+failed:
+ WARN_ON(1);
+ return err;
+}
+
+static enum qman_cb_dqrr_result cb_dqrr(struct qman_portal *p,
+ struct qman_fq *fq,
+ const struct qm_dqrr_entry *dq)
+{
+ if (WARN_ON(fd_cmp(&fd_dq, &dq->fd))) {
+ pr_err("BADNESS: dequeued frame doesn't match;\n");
+ return qman_cb_dqrr_consume;
+ }
+ fd_inc(&fd_dq);
+ if (!(dq->stat & QM_DQRR_STAT_UNSCHEDULED) && !fd_cmp(&fd_dq, &fd)) {
+ sdqcr_complete = 1;
+ wake_up(&waitqueue);
+ }
+ return qman_cb_dqrr_consume;
+}
+
+static void cb_ern(struct qman_portal *p, struct qman_fq *fq,
+ const union qm_mr_entry *msg)
+{
+ pr_crit("cb_ern() unimplemented");
+ WARN_ON(1);
+}
+
+static void cb_fqs(struct qman_portal *p, struct qman_fq *fq,
+ const union qm_mr_entry *msg)
+{
+ u8 verb = (msg->verb & QM_MR_VERB_TYPE_MASK);
+
+ if ((verb != QM_MR_VERB_FQRN) && (verb != QM_MR_VERB_FQRNI)) {
+ pr_crit("unexpected FQS message");
+ WARN_ON(1);
+ return;
+ }
+ pr_info("Retirement message received\n");
+ retire_complete = 1;
+ wake_up(&waitqueue);
+}
diff --git a/drivers/soc/fsl/qbman/qman_test_stash.c b/drivers/soc/fsl/qbman/qman_test_stash.c
new file mode 100644
index 0000000..43cf66b
--- /dev/null
+++ b/drivers/soc/fsl/qbman/qman_test_stash.c
@@ -0,0 +1,617 @@
+/* Copyright 2009 - 2016 Freescale Semiconductor, Inc.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * * Neither the name of Freescale Semiconductor nor the
+ * names of its contributors may be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * ALTERNATIVELY, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL") as published by the Free Software
+ * Foundation, either version 2 of that License or (at your option) any
+ * later version.
+ *
+ * THIS SOFTWARE IS PROVIDED BY Freescale Semiconductor ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL Freescale Semiconductor BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "qman_test.h"
+
+#include <linux/dma-mapping.h>
+#include <linux/delay.h>
+
+/*
+ * Algorithm:
+ *
+ * Each cpu will have HP_PER_CPU "handlers" set up, each of which incorporates
+ * an rx/tx pair of FQ objects (both of which are stashed on dequeue). The
+ * organisation of FQIDs is such that the HP_PER_CPU*NUM_CPUS handlers will
+ * shuttle a "hot potato" frame around them such that every forwarding action
+ * moves it from one cpu to another. (The use of more than one handler per cpu
+ * is to allow enough handlers/FQs to truly test the significance of caching -
+ * ie. when cache-expiries are occurring.)
+ *
+ * The "hot potato" frame content will be HP_NUM_WORDS*4 bytes in size, and the
+ * first and last words of the frame data will undergo a transformation step on
+ * each forwarding action. To achieve this, each handler will be assigned a
+ * 32-bit "mixer", that is produced using a 32-bit LFSR. When a frame is
+ * received by a handler, the mixer of the expected sender is XOR'd into all
+ * words of the entire frame, which is then validated against the original
+ * values. Then, before forwarding, the entire frame is XOR'd with the mixer of
+ * the current handler. Apart from validating that the frame is taking the
+ * expected path, this also provides some quasi-realistic overheads to each
+ * forwarding action - dereferencing *all* the frame data, computation, and
+ * conditional branching. There is a "special" handler designated to act as the
+ * instigator of the test by creating an enqueuing the "hot potato" frame, and
+ * to determine when the test has completed by counting HP_LOOPS iterations.
+ *
+ * Init phases:
+ *
+ * 1. prepare each cpu's 'hp_cpu' struct using on_each_cpu(,,1) and link them
+ * into 'hp_cpu_list'. Specifically, set processor_id, allocate HP_PER_CPU
+ * handlers and link-list them (but do no other handler setup).
+ *
+ * 2. scan over 'hp_cpu_list' HP_PER_CPU times, the first time sets each
+ * hp_cpu's 'iterator' to point to its first handler. With each loop,
+ * allocate rx/tx FQIDs and mixer values to the hp_cpu's iterator handler
+ * and advance the iterator for the next loop. This includes a final fixup,
+ * which connects the last handler to the first (and which is why phase 2
+ * and 3 are separate).
+ *
+ * 3. scan over 'hp_cpu_list' HP_PER_CPU times, the first time sets each
+ * hp_cpu's 'iterator' to point to its first handler. With each loop,
+ * initialise FQ objects and advance the iterator for the next loop.
+ * Moreover, do this initialisation on the cpu it applies to so that Rx FQ
+ * initialisation targets the correct cpu.
+ */
+
+/*
+ * helper to run something on all cpus (can't use on_each_cpu(), as that invokes
+ * the fn from irq context, which is too restrictive).
+ */
+struct bstrap {
+ int (*fn)(void);
+ atomic_t started;
+};
+static int bstrap_fn(void *bs)
+{
+ struct bstrap *bstrap = bs;
+ int err;
+
+ atomic_inc(&bstrap->started);
+ err = bstrap->fn();
+ if (err)
+ return err;
+ while (!kthread_should_stop())
+ msleep(20);
+ return 0;
+}
+static int on_all_cpus(int (*fn)(void))
+{
+ int cpu;
+
+ for_each_cpu(cpu, cpu_online_mask) {
+ struct bstrap bstrap = {
+ .fn = fn,
+ .started = ATOMIC_INIT(0)
+ };
+ struct task_struct *k = kthread_create(bstrap_fn, &bstrap,
+ "hotpotato%d", cpu);
+ int ret;
+
+ if (IS_ERR(k))
+ return -ENOMEM;
+ kthread_bind(k, cpu);
+ wake_up_process(k);
+ /*
+ * If we call kthread_stop() before the "wake up" has had an
+ * effect, then the thread may exit with -EINTR without ever
+ * running the function. So poll until it's started before
+ * requesting it to stop.
+ */
+ while (!atomic_read(&bstrap.started))
+ msleep(20);
+ ret = kthread_stop(k);
+ if (ret)
+ return ret;
+ }
+ return 0;
+}
+
+struct hp_handler {
+
+ /* The following data is stashed when 'rx' is dequeued; */
+ /* -------------- */
+ /* The Rx FQ, dequeues of which will stash the entire hp_handler */
+ struct qman_fq rx;
+ /* The Tx FQ we should forward to */
+ struct qman_fq tx;
+ /* The value we XOR post-dequeue, prior to validating */
+ u32 rx_mixer;
+ /* The value we XOR pre-enqueue, after validating */
+ u32 tx_mixer;
+ /* what the hotpotato address should be on dequeue */
+ dma_addr_t addr;
+ u32 *frame_ptr;
+
+ /* The following data isn't (necessarily) stashed on dequeue; */
+ /* -------------- */
+ u32 fqid_rx, fqid_tx;
+ /* list node for linking us into 'hp_cpu' */
+ struct list_head node;
+ /* Just to check ... */
+ unsigned int processor_id;
+} ____cacheline_aligned;
+
+struct hp_cpu {
+ /* identify the cpu we run on; */
+ unsigned int processor_id;
+ /* root node for the per-cpu list of handlers */
+ struct list_head handlers;
+ /* list node for linking us into 'hp_cpu_list' */
+ struct list_head node;
+ /*
+ * when repeatedly scanning 'hp_list', each time linking the n'th
+ * handlers together, this is used as per-cpu iterator state
+ */
+ struct hp_handler *iterator;
+};
+
+/* Each cpu has one of these */
+static DEFINE_PER_CPU(struct hp_cpu, hp_cpus);
+
+/* links together the hp_cpu structs, in first-come first-serve order. */
+static LIST_HEAD(hp_cpu_list);
+static spinlock_t hp_lock = __SPIN_LOCK_UNLOCKED(hp_lock);
+
+static unsigned int hp_cpu_list_length;
+
+/* the "special" handler, that starts and terminates the test. */
+static struct hp_handler *special_handler;
+static int loop_counter;
+
+/* handlers are allocated out of this, so they're properly aligned. */
+static struct kmem_cache *hp_handler_slab;
+
+/* this is the frame data */
+static void *__frame_ptr;
+static u32 *frame_ptr;
+static dma_addr_t frame_dma;
+
+/* the main function waits on this */
+static DECLARE_WAIT_QUEUE_HEAD(queue);
+
+#define HP_PER_CPU 2
+#define HP_LOOPS 8
+/* 80 bytes, like a small ethernet frame, and bleeds into a second cacheline */
+#define HP_NUM_WORDS 80
+/* First word of the LFSR-based frame data */
+#define HP_FIRST_WORD 0xabbaf00d
+
+static inline u32 do_lfsr(u32 prev)
+{
+ return (prev >> 1) ^ (-(prev & 1u) & 0xd0000001u);
+}
+
+static int allocate_frame_data(void)
+{
+ u32 lfsr = HP_FIRST_WORD;
+ int loop;
+ struct platform_device *pdev = platform_device_alloc("foobar", -1);
+
+ if (!pdev) {
+ pr_crit("platform_device_alloc() failed");
+ return -EIO;
+ }
+ if (platform_device_add(pdev)) {
+ pr_crit("platform_device_add() failed");
+ return -EIO;
+ }
+ __frame_ptr = kmalloc(4 * HP_NUM_WORDS, GFP_KERNEL);
+ if (!__frame_ptr)
+ return -ENOMEM;
+
+ frame_ptr = PTR_ALIGN(__frame_ptr, 64);
+ for (loop = 0; loop < HP_NUM_WORDS; loop++) {
+ frame_ptr[loop] = lfsr;
+ lfsr = do_lfsr(lfsr);
+ }
+ frame_dma = dma_map_single(&pdev->dev, frame_ptr, 4 * HP_NUM_WORDS,
+ DMA_BIDIRECTIONAL);
+ platform_device_del(pdev);
+ platform_device_put(pdev);
+ return 0;
+}
+
+static void deallocate_frame_data(void)
+{
+ kfree(__frame_ptr);
+}
+
+static inline int process_frame_data(struct hp_handler *handler,
+ const struct qm_fd *fd)
+{
+ u32 *p = handler->frame_ptr;
+ u32 lfsr = HP_FIRST_WORD;
+ int loop;
+
+ if (qm_fd_addr_get64(fd) != handler->addr) {
+ pr_crit("bad frame address");
+ return -EIO;
+ }
+ for (loop = 0; loop < HP_NUM_WORDS; loop++, p++) {
+ *p ^= handler->rx_mixer;
+ if (*p != lfsr) {
+ pr_crit("corrupt frame data");
+ return -EIO;
+ }
+ *p ^= handler->tx_mixer;
+ lfsr = do_lfsr(lfsr);
+ }
+ return 0;
+}
+
+static enum qman_cb_dqrr_result normal_dqrr(struct qman_portal *portal,
+ struct qman_fq *fq,
+ const struct qm_dqrr_entry *dqrr)
+{
+ struct hp_handler *handler = (struct hp_handler *)fq;
+
+ if (process_frame_data(handler, &dqrr->fd)) {
+ WARN_ON(1);
+ goto skip;
+ }
+ if (qman_enqueue(&handler->tx, &dqrr->fd)) {
+ pr_crit("qman_enqueue() failed");
+ WARN_ON(1);
+ }
+skip:
+ return qman_cb_dqrr_consume;
+}
+
+static enum qman_cb_dqrr_result special_dqrr(struct qman_portal *portal,
+ struct qman_fq *fq,
+ const struct qm_dqrr_entry *dqrr)
+{
+ struct hp_handler *handler = (struct hp_handler *)fq;
+
+ process_frame_data(handler, &dqrr->fd);
+ if (++loop_counter < HP_LOOPS) {
+ if (qman_enqueue(&handler->tx, &dqrr->fd)) {
+ pr_crit("qman_enqueue() failed");
+ WARN_ON(1);
+ goto skip;
+ }
+ } else {
+ pr_info("Received final (%dth) frame\n", loop_counter);
+ wake_up(&queue);
+ }
+skip:
+ return qman_cb_dqrr_consume;
+}
+
+static int create_per_cpu_handlers(void)
+{
+ struct hp_handler *handler;
+ int loop;
+ struct hp_cpu *hp_cpu = this_cpu_ptr(&hp_cpus);
+
+ hp_cpu->processor_id = smp_processor_id();
+ spin_lock(&hp_lock);
+ list_add_tail(&hp_cpu->node, &hp_cpu_list);
+ hp_cpu_list_length++;
+ spin_unlock(&hp_lock);
+ INIT_LIST_HEAD(&hp_cpu->handlers);
+ for (loop = 0; loop < HP_PER_CPU; loop++) {
+ handler = kmem_cache_alloc(hp_handler_slab, GFP_KERNEL);
+ if (!handler) {
+ pr_crit("kmem_cache_alloc() failed");
+ WARN_ON(1);
+ return -EIO;
+ }
+ handler->processor_id = hp_cpu->processor_id;
+ handler->addr = frame_dma;
+ handler->frame_ptr = frame_ptr;
+ list_add_tail(&handler->node, &hp_cpu->handlers);
+ }
+ return 0;
+}
+
+static int destroy_per_cpu_handlers(void)
+{
+ struct list_head *loop, *tmp;
+ struct hp_cpu *hp_cpu = this_cpu_ptr(&hp_cpus);
+
+ spin_lock(&hp_lock);
+ list_del(&hp_cpu->node);
+ spin_unlock(&hp_lock);
+ list_for_each_safe(loop, tmp, &hp_cpu->handlers) {
+ u32 flags = 0;
+ struct hp_handler *handler = list_entry(loop, struct hp_handler,
+ node);
+ if (qman_retire_fq(&handler->rx, &flags) ||
+ (flags & QMAN_FQ_STATE_BLOCKOOS)) {
+ pr_crit("qman_retire_fq(rx) failed, flags: %x", flags);
+ WARN_ON(1);
+ return -EIO;
+ }
+ if (qman_oos_fq(&handler->rx)) {
+ pr_crit("qman_oos_fq(rx) failed");
+ WARN_ON(1);
+ return -EIO;
+ }
+ qman_destroy_fq(&handler->rx);
+ qman_destroy_fq(&handler->tx);
+ qman_release_fqid(handler->fqid_rx);
+ list_del(&handler->node);
+ kmem_cache_free(hp_handler_slab, handler);
+ }
+ return 0;
+}
+
+static inline u8 num_cachelines(u32 offset)
+{
+ u8 res = (offset + (L1_CACHE_BYTES - 1))
+ / (L1_CACHE_BYTES);
+ if (res > 3)
+ return 3;
+ return res;
+}
+#define STASH_DATA_CL \
+ num_cachelines(HP_NUM_WORDS * 4)
+#define STASH_CTX_CL \
+ num_cachelines(offsetof(struct hp_handler, fqid_rx))
+
+static int init_handler(void *h)
+{
+ struct qm_mcc_initfq opts;
+ struct hp_handler *handler = h;
+ int err;
+
+ if (handler->processor_id != smp_processor_id()) {
+ err = -EIO;
+ goto failed;
+ }
+ /* Set up rx */
+ memset(&handler->rx, 0, sizeof(handler->rx));
+ if (handler == special_handler)
+ handler->rx.cb.dqrr = special_dqrr;
+ else
+ handler->rx.cb.dqrr = normal_dqrr;
+ err = qman_create_fq(handler->fqid_rx, 0, &handler->rx);
+ if (err) {
+ pr_crit("qman_create_fq(rx) failed");
+ goto failed;
+ }
+ memset(&opts, 0, sizeof(opts));
+ opts.we_mask = QM_INITFQ_WE_FQCTRL | QM_INITFQ_WE_CONTEXTA;
+ opts.fqd.fq_ctrl = QM_FQCTRL_CTXASTASHING;
+ qm_fqd_set_stashing(&opts.fqd, 0, STASH_DATA_CL, STASH_CTX_CL);
+ err = qman_init_fq(&handler->rx, QMAN_INITFQ_FLAG_SCHED |
+ QMAN_INITFQ_FLAG_LOCAL, &opts);
+ if (err) {
+ pr_crit("qman_init_fq(rx) failed");
+ goto failed;
+ }
+ /* Set up tx */
+ memset(&handler->tx, 0, sizeof(handler->tx));
+ err = qman_create_fq(handler->fqid_tx, QMAN_FQ_FLAG_NO_MODIFY,
+ &handler->tx);
+ if (err) {
+ pr_crit("qman_create_fq(tx) failed");
+ goto failed;
+ }
+
+ return 0;
+failed:
+ return err;
+}
+
+static void init_handler_cb(void *h)
+{
+ if (init_handler(h))
+ WARN_ON(1);
+}
+
+static int init_phase2(void)
+{
+ int loop;
+ u32 fqid = 0;
+ u32 lfsr = 0xdeadbeef;
+ struct hp_cpu *hp_cpu;
+ struct hp_handler *handler;
+
+ for (loop = 0; loop < HP_PER_CPU; loop++) {
+ list_for_each_entry(hp_cpu, &hp_cpu_list, node) {
+ int err;
+
+ if (!loop)
+ hp_cpu->iterator = list_first_entry(
+ &hp_cpu->handlers,
+ struct hp_handler, node);
+ else
+ hp_cpu->iterator = list_entry(
+ hp_cpu->iterator->node.next,
+ struct hp_handler, node);
+ /* Rx FQID is the previous handler's Tx FQID */
+ hp_cpu->iterator->fqid_rx = fqid;
+ /* Allocate new FQID for Tx */
+ err = qman_alloc_fqid(&fqid);
+ if (err) {
+ pr_crit("qman_alloc_fqid() failed");
+ return err;
+ }
+ hp_cpu->iterator->fqid_tx = fqid;
+ /* Rx mixer is the previous handler's Tx mixer */
+ hp_cpu->iterator->rx_mixer = lfsr;
+ /* Get new mixer for Tx */
+ lfsr = do_lfsr(lfsr);
+ hp_cpu->iterator->tx_mixer = lfsr;
+ }
+ }
+ /* Fix up the first handler (fqid_rx==0, rx_mixer=0xdeadbeef) */
+ hp_cpu = list_first_entry(&hp_cpu_list, struct hp_cpu, node);
+ handler = list_first_entry(&hp_cpu->handlers, struct hp_handler, node);
+ if (handler->fqid_rx != 0 || handler->rx_mixer != 0xdeadbeef)
+ return 1;
+ handler->fqid_rx = fqid;
+ handler->rx_mixer = lfsr;
+ /* and tag it as our "special" handler */
+ special_handler = handler;
+ return 0;
+}
+
+static int init_phase3(void)
+{
+ int loop, err;
+ struct hp_cpu *hp_cpu;
+
+ for (loop = 0; loop < HP_PER_CPU; loop++) {
+ list_for_each_entry(hp_cpu, &hp_cpu_list, node) {
+ if (!loop)
+ hp_cpu->iterator = list_first_entry(
+ &hp_cpu->handlers,
+ struct hp_handler, node);
+ else
+ hp_cpu->iterator = list_entry(
+ hp_cpu->iterator->node.next,
+ struct hp_handler, node);
+ preempt_disable();
+ if (hp_cpu->processor_id == smp_processor_id()) {
+ err = init_handler(hp_cpu->iterator);
+ if (err)
+ return err;
+ } else {
+ smp_call_function_single(hp_cpu->processor_id,
+ init_handler_cb, hp_cpu->iterator, 1);
+ }
+ preempt_enable();
+ }
+ }
+ return 0;
+}
+
+static int send_first_frame(void *ignore)
+{
+ u32 *p = special_handler->frame_ptr;
+ u32 lfsr = HP_FIRST_WORD;
+ int loop, err;
+ struct qm_fd fd;
+
+ if (special_handler->processor_id != smp_processor_id()) {
+ err = -EIO;
+ goto failed;
+ }
+ memset(&fd, 0, sizeof(fd));
+ qm_fd_addr_set64(&fd, special_handler->addr);
+ qm_fd_set_contig_big(&fd, HP_NUM_WORDS * 4);
+ for (loop = 0; loop < HP_NUM_WORDS; loop++, p++) {
+ if (*p != lfsr) {
+ err = -EIO;
+ pr_crit("corrupt frame data");
+ goto failed;
+ }
+ *p ^= special_handler->tx_mixer;
+ lfsr = do_lfsr(lfsr);
+ }
+ pr_info("Sending first frame\n");
+ err = qman_enqueue(&special_handler->tx, &fd);
+ if (err) {
+ pr_crit("qman_enqueue() failed");
+ goto failed;
+ }
+
+ return 0;
+failed:
+ return err;
+}
+
+static void send_first_frame_cb(void *ignore)
+{
+ if (send_first_frame(NULL))
+ WARN_ON(1);
+}
+
+int qman_test_stash(void)
+{
+ int err;
+
+ if (cpumask_weight(cpu_online_mask) < 2) {
+ pr_info("%s(): skip - only 1 CPU\n", __func__);
+ return 0;
+ }
+
+ pr_info("%s(): Starting\n", __func__);
+
+ 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) {
+ err = -EIO;
+ pr_crit("kmem_cache_create() failed");
+ goto failed;
+ }
+
+ err = allocate_frame_data();
+ if (err)
+ goto failed;
+
+ /* Init phase 1 */
+ pr_info("Creating %d handlers per cpu...\n", HP_PER_CPU);
+ if (on_all_cpus(create_per_cpu_handlers)) {
+ err = -EIO;
+ pr_crit("on_each_cpu() failed");
+ goto failed;
+ }
+ pr_info("Number of cpus: %d, total of %d handlers\n",
+ hp_cpu_list_length, hp_cpu_list_length * HP_PER_CPU);
+
+ err = init_phase2();
+ if (err)
+ goto failed;
+
+ err = init_phase3();
+ if (err)
+ goto failed;
+
+ preempt_disable();
+ if (special_handler->processor_id == smp_processor_id()) {
+ err = send_first_frame(NULL);
+ if (err)
+ goto failed;
+ } else {
+ smp_call_function_single(special_handler->processor_id,
+ send_first_frame_cb, NULL, 1);
+ }
+ preempt_enable();
+
+ wait_event(queue, loop_counter == HP_LOOPS);
+ deallocate_frame_data();
+ if (on_all_cpus(destroy_per_cpu_handlers)) {
+ err = -EIO;
+ pr_crit("on_each_cpu() failed");
+ goto failed;
+ }
+ kmem_cache_destroy(hp_handler_slab);
+ pr_info("%s(): Finished\n", __func__);
+
+ return 0;
+failed:
+ WARN_ON(1);
+ return err;
+}
--
1.7.11.7
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