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Date: Thu, 10 Nov 2016 00:20:09 +0000
From: Stuart Yoder <stuart.yoder@....com>
To: Ruxandra Ioana Radulescu <ruxandra.radulescu@....com>,
"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>
CC: "devel@...verdev.osuosl.org" <devel@...verdev.osuosl.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"agraf@...e.de" <agraf@...e.de>, "arnd@...db.de" <arnd@...db.de>,
Leo Li <leoyang.li@....com>, Roy Pledge <roy.pledge@....com>,
Haiying Wang <haiying.wang@....com>
Subject: RE: [PATCH 8/9] bus: fsl-mc: dpio: add the DPAA2 DPIO object driver
> -----Original Message-----
> From: Ruxandra Ioana Radulescu
> Sent: Friday, November 04, 2016 10:11 AM
> To: Stuart Yoder <stuart.yoder@....com>; gregkh@...uxfoundation.org
> Cc: German Rivera <german.rivera@....com>; devel@...verdev.osuosl.org; linux-kernel@...r.kernel.org;
> agraf@...e.de; arnd@...db.de; Leo Li <leoyang.li@....com>; Roy Pledge <roy.pledge@....com>; Haiying Wang
> <haiying.wang@....com>; Stuart Yoder <stuart.yoder@....com>
> Subject: RE: [PATCH 8/9] bus: fsl-mc: dpio: add the DPAA2 DPIO object driver
>
> > -----Original Message-----
> > From: Stuart Yoder
> > Sent: Thursday, November 03, 2016 4:38 PM
> > To: Ruxandra Ioana Radulescu <ruxandra.radulescu@....com>
> > Subject: FW: [PATCH 8/9] bus: fsl-mc: dpio: add the DPAA2 DPIO object
> > driver
> >
> >
> >
> > -----Original Message-----
> > From: Stuart Yoder [mailto:stuart.yoder@....com]
> > Sent: Friday, October 21, 2016 9:02 AM
> > To: gregkh@...uxfoundation.org
> > Cc: German Rivera <german.rivera@....com>; devel@...verdev.osuosl.org;
> > linux-kernel@...r.kernel.org; agraf@...e.de; arnd@...db.de; Leo Li
> > <leoyang.li@....com>; Roy Pledge <roy.pledge@....com>; Haiying Wang
> > <haiying.wang@....com>; Stuart Yoder <stuart.yoder@....com>
> > Subject: [PATCH 8/9] bus: fsl-mc: dpio: add the DPAA2 DPIO object driver
> >
> > From: Roy Pledge <roy.pledge@....com>
> >
> > The DPIO driver registers with the fsl-mc bus to handle bus-related
> > events for DPIO objects. Key responsibility is mapping I/O
> > regions, setting up interrupt handlers, and calling the DPIO
> > service initialization during probe.
> >
> > Signed-off-by: Roy Pledge <roy.pledge@....com>
> > Signed-off-by: Haiying Wang <haiying.wang@....com>
> > Signed-off-by: Stuart Yoder <stuart.yoder@....com>
> > ---
> > drivers/bus/fsl-mc/dpio/Makefile | 2 +-
> > drivers/bus/fsl-mc/dpio/dpio-driver.c | 289
> > ++++++++++++++++++++++++++++++++++
> > 2 files changed, 290 insertions(+), 1 deletion(-)
> > create mode 100644 drivers/bus/fsl-mc/dpio/dpio-driver.c
> >
> > diff --git a/drivers/bus/fsl-mc/dpio/Makefile b/drivers/bus/fsl-
> > mc/dpio/Makefile
> > index 0778da7..837d330 100644
> > --- a/drivers/bus/fsl-mc/dpio/Makefile
> > +++ b/drivers/bus/fsl-mc/dpio/Makefile
> > @@ -6,4 +6,4 @@ subdir-ccflags-y := -Werror
> >
> > obj-$(CONFIG_FSL_MC_DPIO) += fsl-mc-dpio.o
> >
> > -fsl-mc-dpio-objs := dpio.o qbman-portal.o dpio-service.o
> > +fsl-mc-dpio-objs := dpio.o qbman-portal.o dpio-service.o dpio-driver.o
> > diff --git a/drivers/bus/fsl-mc/dpio/dpio-driver.c b/drivers/bus/fsl-
> > mc/dpio/dpio-driver.c
> > new file mode 100644
> > index 0000000..ad04a2c
> > --- /dev/null
> > +++ b/drivers/bus/fsl-mc/dpio/dpio-driver.c
> > @@ -0,0 +1,289 @@
> > +/*
> > + * Copyright 2014-2016 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 <linux/types.h>
> > +#include <linux/init.h>
> > +#include <linux/module.h>
> > +#include <linux/platform_device.h>
> > +#include <linux/interrupt.h>
> > +#include <linux/msi.h>
> > +#include <linux/dma-mapping.h>
> > +#include <linux/delay.h>
> > +
> > +#include <linux/fsl/mc.h>
> > +#include <linux/fsl/dpaa2-io.h>
> > +
> > +#include "qbman-portal.h"
> > +#include "dpio.h"
> > +#include "dpio-cmd.h"
> > +
> > +MODULE_LICENSE("Dual BSD/GPL");
> > +MODULE_AUTHOR("Freescale Semiconductor, Inc");
> > +MODULE_DESCRIPTION("DPIO Driver");
> > +
> > +struct dpio_priv {
> > + struct dpaa2_io *io;
> > +};
> > +
> > +static irqreturn_t dpio_irq_handler(int irq_num, void *arg)
> > +{
> > + struct device *dev = (struct device *)arg;
> > + struct dpio_priv *priv = dev_get_drvdata(dev);
> > +
> > + return dpaa2_io_irq(priv->io);
> > +}
> > +
> > +static void unregister_dpio_irq_handlers(struct fsl_mc_device *dpio_dev)
> > +{
> > + struct fsl_mc_device_irq *irq;
> > +
> > + irq = dpio_dev->irqs[0];
> > +
> > + /* clear the affinity hint */
> > + irq_set_affinity_hint(irq->msi_desc->irq, NULL);
> > +}
> > +
> > +static int register_dpio_irq_handlers(struct fsl_mc_device *dpio_dev, int
> > cpu)
> > +{
> > + struct dpio_priv *priv;
> > + int error;
> > + struct fsl_mc_device_irq *irq;
> > + cpumask_t mask;
> > +
> > + priv = dev_get_drvdata(&dpio_dev->dev);
> > +
> > + irq = dpio_dev->irqs[0];
> > + error = devm_request_irq(&dpio_dev->dev,
> > + irq->msi_desc->irq,
> > + dpio_irq_handler,
> > + 0,
> > + dev_name(&dpio_dev->dev),
> > + &dpio_dev->dev);
> > + if (error < 0) {
> > + dev_err(&dpio_dev->dev,
> > + "devm_request_irq() failed: %d\n",
> > + error);
> > + return error;
> > + }
> > +
> > + /* set the affinity hint */
> > + cpumask_clear(&mask);
> > + cpumask_set_cpu(cpu, &mask);
> > + if (irq_set_affinity_hint(irq->msi_desc->irq, &mask))
> > + dev_err(&dpio_dev->dev,
> > + "irq_set_affinity failed irq %d cpu %d\n",
> > + irq->msi_desc->irq, cpu);
> > +
> > + return 0;
> > +}
> > +
> > +static int dpaa2_dpio_probe(struct fsl_mc_device *dpio_dev)
> > +{
> > + struct dpio_attr dpio_attrs;
> > + struct dpaa2_io_desc desc;
> > + struct dpio_priv *priv;
> > + int err = -ENOMEM;
> > + struct device *dev = &dpio_dev->dev;
> > + static int next_cpu = -1;
> > +
> > + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
> > + if (!priv)
> > + goto err_priv_alloc;
> > +
> > + dev_set_drvdata(dev, priv);
> > +
> > + err = fsl_mc_portal_allocate(dpio_dev, 0, &dpio_dev->mc_io);
> > + if (err) {
> > + dev_dbg(dev, "MC portal allocation failed\n");
> > + err = -EPROBE_DEFER;
> > + goto err_mcportal;
> > + }
> > +
> > + err = dpio_open(dpio_dev->mc_io, 0, dpio_dev->obj_desc.id,
> > + &dpio_dev->mc_handle);
> > + if (err) {
> > + dev_err(dev, "dpio_open() failed\n");
> > + goto err_open;
> > + }
> > +
> > + err = dpio_get_attributes(dpio_dev->mc_io, 0, dpio_dev-
> > >mc_handle,
> > + &dpio_attrs);
> > + if (err) {
> > + dev_err(dev, "dpio_get_attributes() failed %d\n", err);
> > + goto err_get_attr;
> > + }
> > + desc.qman_version = dpio_attrs.qbman_version;
> > +
> > + err = dpio_enable(dpio_dev->mc_io, 0, dpio_dev->mc_handle);
> > + if (err) {
> > + dev_err(dev, "dpio_enable() failed %d\n", err);
> > + goto err_get_attr;
> > + }
> > +
> > + /* initialize DPIO descriptor */
> > + desc.receives_notifications = dpio_attrs.num_priorities ? 1 : 0;
> > + desc.has_8prio = dpio_attrs.num_priorities == 8 ? 1 : 0;
> > + desc.dpio_id = dpio_dev->obj_desc.id;
> > +
> > + /* get the cpu to use for the affinity hint */
> > + if (next_cpu == -1)
> > + next_cpu = cpumask_first(cpu_online_mask);
> > + else
> > + next_cpu = cpumask_next(next_cpu, cpu_online_mask);
> > + desc.cpu = next_cpu;
>
> What happens if there's more DPIOs than cores and cpumask_next
> returns nr_cpu_ids?
We need to error out in that case. DPIO can't handle >= NR_CPUS.
Stuart
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