| Message ID | 1503979486-5364-2-git-send-email-anup.patel@broadcom.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Tue, Aug 29, 2017 at 09:34:46AM +0530, Anup Patel wrote: > This patch adds Broadcom FlexRM low-level reset for > VFIO platform. > Is there an document that explains and /or details the various registers? > 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@broadcom.com> > Reviewed-by: Oza Oza <oza.oza@broadcom.com> > Reviewed-by: Scott Branden <scott.branden@broadcom.com> > Reviewed-by: Eric Auger <eric.auger@redhat.com> > --- > drivers/vfio/platform/reset/Kconfig | 9 ++ > drivers/vfio/platform/reset/Makefile | 1 + > .../vfio/platform/reset/vfio_platform_bcmflexrm.c | 100 +++++++++++++++++++++ > 3 files changed, 110 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..966a813 > --- /dev/null > +++ b/drivers/vfio/platform/reset/vfio_platform_bcmflexrm.c > @@ -0,0 +1,100 @@ > +/* > + * 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 version 2 as > + * published by the Free Software Foundation. > + * > + * This program is distributed in the hope that it will be useful, > + * but WITHOUT ANY WARRANTY; without even the implied warranty of > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the > + * GNU General Public License for more details. > + * > + * You should have received a copy of the GNU General Public License > + * along with this program. If not, see <http://www.gnu.org/licenses/>. > + */ > + > +/* > + * This driver provides reset support for Broadcom FlexRM ring manager > + * to VFIO platform. > + */ > + > +#include <linux/delay.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); > + > + /* Flush ring with timeout of 1s */ > + timeout = 1000; Perhaps a #define for this value? > + 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) { > + pr_warn("VFIO FlexRM shutdown timeout\n"); > + return -ETIMEDOUT; > + } > + > + return 0; > +} > + > +static int vfio_platform_bcmflexrm_reset(struct vfio_platform_device *vdev) > +{ > + int rc = 0; > + void __iomem *ring; > + 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) > + break; You sure? Don't you want to continue trying to reset all of them and then return rc at the end? > + } > + } > + > + return rc; > +} > + > +module_vfio_reset_handler("brcm,iproc-flexrm-mbox", > + vfio_platform_bcmflexrm_reset); > + > +MODULE_LICENSE("GPL v2"); > +MODULE_AUTHOR("Anup Patel <anup.patel@broadcom.com>"); > +MODULE_DESCRIPTION("Reset support for Broadcom FlexRM VFIO platform device"); > -- > 2.7.4 >
Sorry for delayed response... On Tue, Aug 29, 2017 at 7:39 PM, Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> wrote: > On Tue, Aug 29, 2017 at 09:34:46AM +0530, Anup Patel wrote: >> This patch adds Broadcom FlexRM low-level reset for >> VFIO platform. >> > > Is there an document that explains and /or details the various > registers? Yes, there is a document but its not publicly accessible. >> 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@broadcom.com> >> Reviewed-by: Oza Oza <oza.oza@broadcom.com> >> Reviewed-by: Scott Branden <scott.branden@broadcom.com> >> Reviewed-by: Eric Auger <eric.auger@redhat.com> >> --- >> drivers/vfio/platform/reset/Kconfig | 9 ++ >> drivers/vfio/platform/reset/Makefile | 1 + >> .../vfio/platform/reset/vfio_platform_bcmflexrm.c | 100 +++++++++++++++++++++ >> 3 files changed, 110 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..966a813 >> --- /dev/null >> +++ b/drivers/vfio/platform/reset/vfio_platform_bcmflexrm.c >> @@ -0,0 +1,100 @@ >> +/* >> + * 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 version 2 as >> + * published by the Free Software Foundation. >> + * >> + * This program is distributed in the hope that it will be useful, >> + * but WITHOUT ANY WARRANTY; without even the implied warranty of >> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the >> + * GNU General Public License for more details. >> + * >> + * You should have received a copy of the GNU General Public License >> + * along with this program. If not, see <http://www.gnu.org/licenses/>. >> + */ >> + >> +/* >> + * This driver provides reset support for Broadcom FlexRM ring manager >> + * to VFIO platform. >> + */ >> + >> +#include <linux/delay.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); >> + >> + /* Flush ring with timeout of 1s */ >> + timeout = 1000; > > Perhaps a #define for this value? This magic value 1000 makes it explicit that we try till 1 second because inside the loop we have mdelay(1). > >> + 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) { >> + pr_warn("VFIO FlexRM shutdown timeout\n"); >> + return -ETIMEDOUT; >> + } >> + >> + return 0; >> +} There is a correction in the sequence suggested by HW folks. After above, we need to clear the FLUSH bit in RING_CONTROL register and then wait for FLUSH_DONE bit to be cleared in RING_FLUSH_DONE register. This was missed out previously due to incomplete documentation. >> + >> +static int vfio_platform_bcmflexrm_reset(struct vfio_platform_device *vdev) >> +{ >> + int rc = 0; >> + void __iomem *ring; >> + 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) >> + break; > > You sure? Don't you want to continue trying to reset all of them and > then return rc at the end? Yes, I think its better to reset all even if few fail. I will update this accordingly. Thanks, Anup
On Mon, 4 Sep 2017 15:20:11 +0530 Anup Patel <anup.patel@broadcom.com> wrote: > Sorry for delayed response... > > On Tue, Aug 29, 2017 at 7:39 PM, Konrad Rzeszutek Wilk > <konrad.wilk@oracle.com> wrote: > > On Tue, Aug 29, 2017 at 09:34:46AM +0530, Anup Patel wrote: > >> This patch adds Broadcom FlexRM low-level reset for > >> VFIO platform. > >> > > > > Is there an document that explains and /or details the various > > registers? > > Yes, there is a document but its not publicly accessible. > > >> 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@broadcom.com> > >> Reviewed-by: Oza Oza <oza.oza@broadcom.com> > >> Reviewed-by: Scott Branden <scott.branden@broadcom.com> > >> Reviewed-by: Eric Auger <eric.auger@redhat.com> > >> --- > >> drivers/vfio/platform/reset/Kconfig | 9 ++ > >> drivers/vfio/platform/reset/Makefile | 1 + > >> .../vfio/platform/reset/vfio_platform_bcmflexrm.c | 100 +++++++++++++++++++++ > >> 3 files changed, 110 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..966a813 > >> --- /dev/null > >> +++ b/drivers/vfio/platform/reset/vfio_platform_bcmflexrm.c > >> @@ -0,0 +1,100 @@ > >> +/* > >> + * 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 version 2 as > >> + * published by the Free Software Foundation. > >> + * > >> + * This program is distributed in the hope that it will be useful, > >> + * but WITHOUT ANY WARRANTY; without even the implied warranty of > >> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the > >> + * GNU General Public License for more details. > >> + * > >> + * You should have received a copy of the GNU General Public License > >> + * along with this program. If not, see <http://www.gnu.org/licenses/>. > >> + */ > >> + > >> +/* > >> + * This driver provides reset support for Broadcom FlexRM ring manager > >> + * to VFIO platform. > >> + */ > >> + > >> +#include <linux/delay.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); > >> + > >> + /* Flush ring with timeout of 1s */ > >> + timeout = 1000; > > > > Perhaps a #define for this value? > > This magic value 1000 makes it explicit that we try till 1 second > because inside the loop we have mdelay(1). > > > > >> + 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) { > >> + pr_warn("VFIO FlexRM shutdown timeout\n"); Since you're planning a new version anyway, perhaps we could also pass the device through and use a dev_warn here so we can associate this error to a specific device. Perhaps even knowing which ring on the device encountered the timeout would be useful. Thanks, Alex > >> + return -ETIMEDOUT; > >> + } > >> + > >> + return 0; > >> +} > > There is a correction in the sequence suggested by HW folks. > > After above, we need to clear the FLUSH bit in RING_CONTROL > register and then wait for FLUSH_DONE bit to be cleared in > RING_FLUSH_DONE register. > > This was missed out previously due to incomplete documentation. > > >> + > >> +static int vfio_platform_bcmflexrm_reset(struct vfio_platform_device *vdev) > >> +{ > >> + int rc = 0; > >> + void __iomem *ring; > >> + 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) > >> + break; > > > > You sure? Don't you want to continue trying to reset all of them and > > then return rc at the end? > > Yes, I think its better to reset all even if few fail. I will update this > accordingly. > > Thanks, > Anup
On Tue, Sep 5, 2017 at 9:27 PM, Alex Williamson <alex.williamson@redhat.com> wrote: > On Mon, 4 Sep 2017 15:20:11 +0530 > Anup Patel <anup.patel@broadcom.com> wrote: > >> Sorry for delayed response... >> >> On Tue, Aug 29, 2017 at 7:39 PM, Konrad Rzeszutek Wilk >> <konrad.wilk@oracle.com> wrote: >> > On Tue, Aug 29, 2017 at 09:34:46AM +0530, Anup Patel wrote: >> >> This patch adds Broadcom FlexRM low-level reset for >> >> VFIO platform. >> >> >> > >> > Is there an document that explains and /or details the various >> > registers? >> >> Yes, there is a document but its not publicly accessible. >> >> >> 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@broadcom.com> >> >> Reviewed-by: Oza Oza <oza.oza@broadcom.com> >> >> Reviewed-by: Scott Branden <scott.branden@broadcom.com> >> >> Reviewed-by: Eric Auger <eric.auger@redhat.com> >> >> --- >> >> drivers/vfio/platform/reset/Kconfig | 9 ++ >> >> drivers/vfio/platform/reset/Makefile | 1 + >> >> .../vfio/platform/reset/vfio_platform_bcmflexrm.c | 100 +++++++++++++++++++++ >> >> 3 files changed, 110 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..966a813 >> >> --- /dev/null >> >> +++ b/drivers/vfio/platform/reset/vfio_platform_bcmflexrm.c >> >> @@ -0,0 +1,100 @@ >> >> +/* >> >> + * 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 version 2 as >> >> + * published by the Free Software Foundation. >> >> + * >> >> + * This program is distributed in the hope that it will be useful, >> >> + * but WITHOUT ANY WARRANTY; without even the implied warranty of >> >> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the >> >> + * GNU General Public License for more details. >> >> + * >> >> + * You should have received a copy of the GNU General Public License >> >> + * along with this program. If not, see <http://www.gnu.org/licenses/>. >> >> + */ >> >> + >> >> +/* >> >> + * This driver provides reset support for Broadcom FlexRM ring manager >> >> + * to VFIO platform. >> >> + */ >> >> + >> >> +#include <linux/delay.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); >> >> + >> >> + /* Flush ring with timeout of 1s */ >> >> + timeout = 1000; >> > >> > Perhaps a #define for this value? >> >> This magic value 1000 makes it explicit that we try till 1 second >> because inside the loop we have mdelay(1). >> >> > >> >> + 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) { >> >> + pr_warn("VFIO FlexRM shutdown timeout\n"); > > Since you're planning a new version anyway, perhaps we could also pass > the device through and use a dev_warn here so we can associate this > error to a specific device. Perhaps even knowing which ring on the > device encountered the timeout would be useful. Thanks, Sure, will do. Regards, Anup
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..966a813 --- /dev/null +++ b/drivers/vfio/platform/reset/vfio_platform_bcmflexrm.c @@ -0,0 +1,100 @@ +/* + * 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 version 2 as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ + +/* + * This driver provides reset support for Broadcom FlexRM ring manager + * to VFIO platform. + */ + +#include <linux/delay.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); + + /* Flush ring with timeout of 1s */ + timeout = 1000; + 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) { + pr_warn("VFIO FlexRM shutdown timeout\n"); + return -ETIMEDOUT; + } + + return 0; +} + +static int vfio_platform_bcmflexrm_reset(struct vfio_platform_device *vdev) +{ + int rc = 0; + void __iomem *ring; + 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) + break; + } + } + + return rc; +} + +module_vfio_reset_handler("brcm,iproc-flexrm-mbox", + vfio_platform_bcmflexrm_reset); + +MODULE_LICENSE("GPL v2"); +MODULE_AUTHOR("Anup Patel <anup.patel@broadcom.com>"); +MODULE_DESCRIPTION("Reset support for Broadcom FlexRM VFIO platform device");