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Date: Wed, 25 Oct 2017 23:37:30 +0200
From: Alex Williamson <alex.williamson@...hat.com>
To: Anup Patel <anup.patel@...adcom.com>
Cc: Will Deacon <will.deacon@....com>,
Robin Murphy <robin.murphy@....com>,
Joerg Roedel <joro@...tes.org>,
Baptiste Reynal <b.reynal@...tualopensystems.com>,
Scott Branden <sbranden@...adcom.com>,
Linux Kernel <linux-kernel@...r.kernel.org>,
Linux ARM Kernel <linux-arm-kernel@...ts.infradead.org>,
Linux IOMMU <iommu@...ts.linux-foundation.org>,
kvm@...r.kernel.org,
BCM Kernel Feedback <bcm-kernel-feedback-list@...adcom.com>
Subject: Re: [PATCH v10] vfio: platform: reset: Add Broadcom FlexRM reset
module
On Wed, 25 Oct 2017 11:19:21 +0530
Anup Patel <anup.patel@...adcom.com> wrote:
> On Tue, Oct 3, 2017 at 10:57 AM, Anup Patel <anup.patel@...adcom.com> wrote:
> > This patch adds Broadcom FlexRM low-level reset for
> > VFIO platform.
> >
> > It will do the following:
> > 1. Disable/Deactivate each FlexRM ring
> > 2. Flush each FlexRM ring
> >
> > The cleanup sequence for FlexRM rings is adapted from
> > Broadcom FlexRM mailbox driver.
> >
> > Signed-off-by: Anup Patel <anup.patel@...adcom.com>
> > Reviewed-by: Oza Oza <oza.oza@...adcom.com>
> > Reviewed-by: Scott Branden <scott.branden@...adcom.com>
> > Reviewed-by: Eric Auger <eric.auger@...hat.com>
> > ---
> > drivers/vfio/platform/reset/Kconfig | 9 ++
> > drivers/vfio/platform/reset/Makefile | 1 +
> > .../vfio/platform/reset/vfio_platform_bcmflexrm.c | 113 +++++++++++++++++++++
> > 3 files changed, 123 insertions(+)
> > create mode 100644 drivers/vfio/platform/reset/vfio_platform_bcmflexrm.c
> >
> > diff --git a/drivers/vfio/platform/reset/Kconfig b/drivers/vfio/platform/reset/Kconfig
> > index 70cccc5..392e3c0 100644
> > --- a/drivers/vfio/platform/reset/Kconfig
> > +++ b/drivers/vfio/platform/reset/Kconfig
> > @@ -13,3 +13,12 @@ config VFIO_PLATFORM_AMDXGBE_RESET
> > Enables the VFIO platform driver to handle reset for AMD XGBE
> >
> > If you don't know what to do here, say N.
> > +
> > +config VFIO_PLATFORM_BCMFLEXRM_RESET
> > + tristate "VFIO support for Broadcom FlexRM reset"
> > + depends on VFIO_PLATFORM && (ARCH_BCM_IPROC || COMPILE_TEST)
> > + default ARCH_BCM_IPROC
> > + help
> > + Enables the VFIO platform driver to handle reset for Broadcom FlexRM
> > +
> > + If you don't know what to do here, say N.
> > diff --git a/drivers/vfio/platform/reset/Makefile b/drivers/vfio/platform/reset/Makefile
> > index 93f4e23..8d9874b 100644
> > --- a/drivers/vfio/platform/reset/Makefile
> > +++ b/drivers/vfio/platform/reset/Makefile
> > @@ -5,3 +5,4 @@ ccflags-y += -Idrivers/vfio/platform
> >
> > obj-$(CONFIG_VFIO_PLATFORM_CALXEDAXGMAC_RESET) += vfio-platform-calxedaxgmac.o
> > obj-$(CONFIG_VFIO_PLATFORM_AMDXGBE_RESET) += vfio-platform-amdxgbe.o
> > +obj-$(CONFIG_VFIO_PLATFORM_BCMFLEXRM_RESET) += vfio_platform_bcmflexrm.o
> > diff --git a/drivers/vfio/platform/reset/vfio_platform_bcmflexrm.c b/drivers/vfio/platform/reset/vfio_platform_bcmflexrm.c
> > new file mode 100644
> > index 0000000..d45c3be
> > --- /dev/null
> > +++ b/drivers/vfio/platform/reset/vfio_platform_bcmflexrm.c
> > @@ -0,0 +1,113 @@
> > +/*
> > + * Copyright (C) 2017 Broadcom
> > + *
> > + * This program is free software; you can redistribute it and/or
> > + * modify it under the terms of the GNU General Public License as
> > + * published by the Free Software Foundation version 2.
> > + *
> > + * This program is distributed "as is" WITHOUT ANY WARRANTY of any
> > + * kind, whether express or implied; without even the implied warranty
> > + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> > + * GNU General Public License for more details.
> > + */
> > +
> > +/*
> > + * This driver provides reset support for Broadcom FlexRM ring manager
> > + * to VFIO platform.
> > + */
> > +
> > +#include <linux/delay.h>
> > +#include <linux/device.h>
> > +#include <linux/init.h>
> > +#include <linux/io.h>
> > +#include <linux/kernel.h>
> > +#include <linux/module.h>
> > +
> > +#include "vfio_platform_private.h"
> > +
> > +/* FlexRM configuration */
> > +#define RING_REGS_SIZE 0x10000
> > +#define RING_VER_MAGIC 0x76303031
> > +
> > +/* Per-Ring register offsets */
> > +#define RING_VER 0x000
> > +#define RING_CONTROL 0x034
> > +#define RING_FLUSH_DONE 0x038
> > +
> > +/* Register RING_CONTROL fields */
> > +#define CONTROL_FLUSH_SHIFT 5
> > +
> > +/* Register RING_FLUSH_DONE fields */
> > +#define FLUSH_DONE_MASK 0x1
> > +
> > +static int vfio_platform_bcmflexrm_shutdown(void __iomem *ring)
> > +{
> > + unsigned int timeout;
> > +
> > + /* Disable/inactivate ring */
> > + writel_relaxed(0x0, ring + RING_CONTROL);
> > +
> > + /* Set ring flush state */
> > + timeout = 1000; /* timeout of 1s */
> > + writel_relaxed(BIT(CONTROL_FLUSH_SHIFT), ring + RING_CONTROL);
> > + do {
> > + if (readl_relaxed(ring + RING_FLUSH_DONE) &
> > + FLUSH_DONE_MASK)
> > + break;
> > + mdelay(1);
> > + } while (--timeout);
> > + if (!timeout)
> > + return -ETIMEDOUT;
> > +
> > + /* Clear ring flush state */
> > + timeout = 1000; /* timeout of 1s */
> > + writel_relaxed(0x0, ring + RING_CONTROL);
> > + do {
> > + if (!(readl_relaxed(ring + RING_FLUSH_DONE) &
> > + FLUSH_DONE_MASK))
> > + break;
> > + mdelay(1);
> > + } while (--timeout);
> > + if (!timeout)
> > + return -ETIMEDOUT;
> > +
> > + return 0;
> > +}
> > +
> > +static int vfio_platform_bcmflexrm_reset(struct vfio_platform_device *vdev)
> > +{
> > + void __iomem *ring;
> > + int rc = 0, ret = 0, ring_num = 0;
> > + struct vfio_platform_region *reg = &vdev->regions[0];
> > +
> > + /* Map FlexRM ring registers if not mapped */
> > + if (!reg->ioaddr) {
> > + reg->ioaddr = ioremap_nocache(reg->addr, reg->size);
> > + if (!reg->ioaddr)
> > + return -ENOMEM;
> > + }
> > +
> > + /* Discover and shutdown each FlexRM ring */
> > + for (ring = reg->ioaddr;
> > + ring < (reg->ioaddr + reg->size); ring += RING_REGS_SIZE) {
> > + if (readl_relaxed(ring + RING_VER) == RING_VER_MAGIC) {
> > + rc = vfio_platform_bcmflexrm_shutdown(ring);
> > + if (rc) {
> > + dev_warn(vdev->device,
> > + "FlexRM ring%d shutdown error %d\n",
> > + ring_num, rc);
> > + ret |= rc;
> > + }
> > + ring_num++;
> > + }
> > + }
> > +
> > + return ret;
> > +}
> > +
> > +module_vfio_reset_handler("brcm,iproc-flexrm-mbox",
> > + vfio_platform_bcmflexrm_reset);
> > +
> > +MODULE_LICENSE("GPL v2");
> > +MODULE_AUTHOR("Anup Patel <anup.patel@...adcom.com>");
> > +MODULE_DESCRIPTION("Reset support for Broadcom FlexRM VFIO platform device");
> > --
> > 2.7.4
> >
>
> Hi All,
>
> Any comments on this one ?
Seems ok to me and you've already got Eric's review, applied to
vfio/platform branch for v4.15. Thanks,
Alex
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