v4.19.13 snapshot.
diff --git a/drivers/vfio/platform/Kconfig b/drivers/vfio/platform/Kconfig
new file mode 100644
index 0000000..bb30128
--- /dev/null
+++ b/drivers/vfio/platform/Kconfig
@@ -0,0 +1,22 @@
+config VFIO_PLATFORM
+ tristate "VFIO support for platform devices"
+ depends on VFIO && EVENTFD && (ARM || ARM64)
+ select VFIO_VIRQFD
+ help
+ Support for platform devices with VFIO. This is required to make
+ use of platform devices present on the system using the VFIO
+ framework.
+
+ If you don't know what to do here, say N.
+
+config VFIO_AMBA
+ tristate "VFIO support for AMBA devices"
+ depends on VFIO_PLATFORM && ARM_AMBA
+ help
+ Support for ARM AMBA devices with VFIO. This is required to make
+ use of ARM AMBA devices present on the system using the VFIO
+ framework.
+
+ If you don't know what to do here, say N.
+
+source "drivers/vfio/platform/reset/Kconfig"
diff --git a/drivers/vfio/platform/Makefile b/drivers/vfio/platform/Makefile
new file mode 100644
index 0000000..3f3a24e
--- /dev/null
+++ b/drivers/vfio/platform/Makefile
@@ -0,0 +1,13 @@
+# SPDX-License-Identifier: GPL-2.0
+vfio-platform-base-y := vfio_platform_common.o vfio_platform_irq.o
+vfio-platform-y := vfio_platform.o
+
+obj-$(CONFIG_VFIO_PLATFORM) += vfio-platform.o
+obj-$(CONFIG_VFIO_PLATFORM) += vfio-platform-base.o
+obj-$(CONFIG_VFIO_PLATFORM) += reset/
+
+vfio-amba-y := vfio_amba.o
+
+obj-$(CONFIG_VFIO_AMBA) += vfio-amba.o
+obj-$(CONFIG_VFIO_AMBA) += vfio-platform-base.o
+obj-$(CONFIG_VFIO_AMBA) += reset/
diff --git a/drivers/vfio/platform/reset/Kconfig b/drivers/vfio/platform/reset/Kconfig
new file mode 100644
index 0000000..392e3c0
--- /dev/null
+++ b/drivers/vfio/platform/reset/Kconfig
@@ -0,0 +1,24 @@
+config VFIO_PLATFORM_CALXEDAXGMAC_RESET
+ tristate "VFIO support for calxeda xgmac reset"
+ depends on VFIO_PLATFORM
+ help
+ Enables the VFIO platform driver to handle reset for Calxeda xgmac
+
+ If you don't know what to do here, say N.
+
+config VFIO_PLATFORM_AMDXGBE_RESET
+ tristate "VFIO support for AMD XGBE reset"
+ depends on VFIO_PLATFORM
+ help
+ 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
new file mode 100644
index 0000000..57abd4f
--- /dev/null
+++ b/drivers/vfio/platform/reset/Makefile
@@ -0,0 +1,9 @@
+# SPDX-License-Identifier: GPL-2.0
+vfio-platform-calxedaxgmac-y := vfio_platform_calxedaxgmac.o
+vfio-platform-amdxgbe-y := vfio_platform_amdxgbe.o
+
+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_amdxgbe.c b/drivers/vfio/platform/reset/vfio_platform_amdxgbe.c
new file mode 100644
index 0000000..bcd419c
--- /dev/null
+++ b/drivers/vfio/platform/reset/vfio_platform_amdxgbe.c
@@ -0,0 +1,127 @@
+/*
+ * VFIO platform driver specialized for AMD xgbe reset
+ * reset code is inherited from AMD xgbe native driver
+ *
+ * Copyright (c) 2015 Linaro Ltd.
+ * www.linaro.org
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope 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/>.
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <uapi/linux/mdio.h>
+#include <linux/delay.h>
+
+#include "vfio_platform_private.h"
+
+#define DMA_MR 0x3000
+#define MAC_VR 0x0110
+#define DMA_ISR 0x3008
+#define MAC_ISR 0x00b0
+#define PCS_MMD_SELECT 0xff
+#define MDIO_AN_INT 0x8002
+#define MDIO_AN_INTMASK 0x8001
+
+static unsigned int xmdio_read(void *ioaddr, unsigned int mmd,
+ unsigned int reg)
+{
+ unsigned int mmd_address, value;
+
+ mmd_address = (mmd << 16) | ((reg) & 0xffff);
+ iowrite32(mmd_address >> 8, ioaddr + (PCS_MMD_SELECT << 2));
+ value = ioread32(ioaddr + ((mmd_address & 0xff) << 2));
+ return value;
+}
+
+static void xmdio_write(void *ioaddr, unsigned int mmd,
+ unsigned int reg, unsigned int value)
+{
+ unsigned int mmd_address;
+
+ mmd_address = (mmd << 16) | ((reg) & 0xffff);
+ iowrite32(mmd_address >> 8, ioaddr + (PCS_MMD_SELECT << 2));
+ iowrite32(value, ioaddr + ((mmd_address & 0xff) << 2));
+}
+
+static int vfio_platform_amdxgbe_reset(struct vfio_platform_device *vdev)
+{
+ struct vfio_platform_region *xgmac_regs = &vdev->regions[0];
+ struct vfio_platform_region *xpcs_regs = &vdev->regions[1];
+ u32 dma_mr_value, pcs_value, value;
+ unsigned int count;
+
+ if (!xgmac_regs->ioaddr) {
+ xgmac_regs->ioaddr =
+ ioremap_nocache(xgmac_regs->addr, xgmac_regs->size);
+ if (!xgmac_regs->ioaddr)
+ return -ENOMEM;
+ }
+ if (!xpcs_regs->ioaddr) {
+ xpcs_regs->ioaddr =
+ ioremap_nocache(xpcs_regs->addr, xpcs_regs->size);
+ if (!xpcs_regs->ioaddr)
+ return -ENOMEM;
+ }
+
+ /* reset the PHY through MDIO*/
+ pcs_value = xmdio_read(xpcs_regs->ioaddr, MDIO_MMD_PCS, MDIO_CTRL1);
+ pcs_value |= MDIO_CTRL1_RESET;
+ xmdio_write(xpcs_regs->ioaddr, MDIO_MMD_PCS, MDIO_CTRL1, pcs_value);
+
+ count = 50;
+ do {
+ msleep(20);
+ pcs_value = xmdio_read(xpcs_regs->ioaddr, MDIO_MMD_PCS,
+ MDIO_CTRL1);
+ } while ((pcs_value & MDIO_CTRL1_RESET) && --count);
+
+ if (pcs_value & MDIO_CTRL1_RESET)
+ pr_warn("%s XGBE PHY reset timeout\n", __func__);
+
+ /* disable auto-negotiation */
+ value = xmdio_read(xpcs_regs->ioaddr, MDIO_MMD_AN, MDIO_CTRL1);
+ value &= ~MDIO_AN_CTRL1_ENABLE;
+ xmdio_write(xpcs_regs->ioaddr, MDIO_MMD_AN, MDIO_CTRL1, value);
+
+ /* disable AN IRQ */
+ xmdio_write(xpcs_regs->ioaddr, MDIO_MMD_AN, MDIO_AN_INTMASK, 0);
+
+ /* clear AN IRQ */
+ xmdio_write(xpcs_regs->ioaddr, MDIO_MMD_AN, MDIO_AN_INT, 0);
+
+ /* MAC software reset */
+ dma_mr_value = ioread32(xgmac_regs->ioaddr + DMA_MR);
+ dma_mr_value |= 0x1;
+ iowrite32(dma_mr_value, xgmac_regs->ioaddr + DMA_MR);
+
+ usleep_range(10, 15);
+
+ count = 2000;
+ while (--count && (ioread32(xgmac_regs->ioaddr + DMA_MR) & 1))
+ usleep_range(500, 600);
+
+ if (!count)
+ pr_warn("%s MAC SW reset failed\n", __func__);
+
+ return 0;
+}
+
+module_vfio_reset_handler("amd,xgbe-seattle-v1a", vfio_platform_amdxgbe_reset);
+
+MODULE_VERSION("0.1");
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Eric Auger <eric.auger@linaro.org>");
+MODULE_DESCRIPTION("Reset support for AMD xgbe vfio platform device");
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@broadcom.com>");
+MODULE_DESCRIPTION("Reset support for Broadcom FlexRM VFIO platform device");
diff --git a/drivers/vfio/platform/reset/vfio_platform_calxedaxgmac.c b/drivers/vfio/platform/reset/vfio_platform_calxedaxgmac.c
new file mode 100644
index 0000000..49e5df6
--- /dev/null
+++ b/drivers/vfio/platform/reset/vfio_platform_calxedaxgmac.c
@@ -0,0 +1,85 @@
+/*
+ * VFIO platform driver specialized for Calxeda xgmac reset
+ * reset code is inherited from calxeda xgmac native driver
+ *
+ * Copyright 2010-2011 Calxeda, Inc.
+ * Copyright (c) 2015 Linaro Ltd.
+ * www.linaro.org
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope 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/>.
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/io.h>
+
+#include "vfio_platform_private.h"
+
+#define DRIVER_VERSION "0.1"
+#define DRIVER_AUTHOR "Eric Auger <eric.auger@linaro.org>"
+#define DRIVER_DESC "Reset support for Calxeda xgmac vfio platform device"
+
+/* XGMAC Register definitions */
+#define XGMAC_CONTROL 0x00000000 /* MAC Configuration */
+
+/* DMA Control and Status Registers */
+#define XGMAC_DMA_CONTROL 0x00000f18 /* Ctrl (Operational Mode) */
+#define XGMAC_DMA_INTR_ENA 0x00000f1c /* Interrupt Enable */
+
+/* DMA Control registe defines */
+#define DMA_CONTROL_ST 0x00002000 /* Start/Stop Transmission */
+#define DMA_CONTROL_SR 0x00000002 /* Start/Stop Receive */
+
+/* Common MAC defines */
+#define MAC_ENABLE_TX 0x00000008 /* Transmitter Enable */
+#define MAC_ENABLE_RX 0x00000004 /* Receiver Enable */
+
+static inline void xgmac_mac_disable(void __iomem *ioaddr)
+{
+ u32 value = readl(ioaddr + XGMAC_DMA_CONTROL);
+
+ value &= ~(DMA_CONTROL_ST | DMA_CONTROL_SR);
+ writel(value, ioaddr + XGMAC_DMA_CONTROL);
+
+ value = readl(ioaddr + XGMAC_CONTROL);
+ value &= ~(MAC_ENABLE_TX | MAC_ENABLE_RX);
+ writel(value, ioaddr + XGMAC_CONTROL);
+}
+
+static int vfio_platform_calxedaxgmac_reset(struct vfio_platform_device *vdev)
+{
+ struct vfio_platform_region *reg = &vdev->regions[0];
+
+ if (!reg->ioaddr) {
+ reg->ioaddr =
+ ioremap_nocache(reg->addr, reg->size);
+ if (!reg->ioaddr)
+ return -ENOMEM;
+ }
+
+ /* disable IRQ */
+ writel(0, reg->ioaddr + XGMAC_DMA_INTR_ENA);
+
+ /* Disable the MAC core */
+ xgmac_mac_disable(reg->ioaddr);
+
+ return 0;
+}
+
+module_vfio_reset_handler("calxeda,hb-xgmac", vfio_platform_calxedaxgmac_reset);
+
+MODULE_VERSION(DRIVER_VERSION);
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR(DRIVER_AUTHOR);
+MODULE_DESCRIPTION(DRIVER_DESC);
diff --git a/drivers/vfio/platform/vfio_amba.c b/drivers/vfio/platform/vfio_amba.c
new file mode 100644
index 0000000..62dfbfe
--- /dev/null
+++ b/drivers/vfio/platform/vfio_amba.c
@@ -0,0 +1,117 @@
+/*
+ * Copyright (C) 2013 - Virtual Open Systems
+ * Author: Antonios Motakis <a.motakis@virtualopensystems.com>
+ *
+ * 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.
+ */
+
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/vfio.h>
+#include <linux/amba/bus.h>
+
+#include "vfio_platform_private.h"
+
+#define DRIVER_VERSION "0.10"
+#define DRIVER_AUTHOR "Antonios Motakis <a.motakis@virtualopensystems.com>"
+#define DRIVER_DESC "VFIO for AMBA devices - User Level meta-driver"
+
+/* probing devices from the AMBA bus */
+
+static struct resource *get_amba_resource(struct vfio_platform_device *vdev,
+ int i)
+{
+ struct amba_device *adev = (struct amba_device *) vdev->opaque;
+
+ if (i == 0)
+ return &adev->res;
+
+ return NULL;
+}
+
+static int get_amba_irq(struct vfio_platform_device *vdev, int i)
+{
+ struct amba_device *adev = (struct amba_device *) vdev->opaque;
+ int ret = 0;
+
+ if (i < AMBA_NR_IRQS)
+ ret = adev->irq[i];
+
+ /* zero is an unset IRQ for AMBA devices */
+ return ret ? ret : -ENXIO;
+}
+
+static int vfio_amba_probe(struct amba_device *adev, const struct amba_id *id)
+{
+ struct vfio_platform_device *vdev;
+ int ret;
+
+ vdev = kzalloc(sizeof(*vdev), GFP_KERNEL);
+ if (!vdev)
+ return -ENOMEM;
+
+ vdev->name = kasprintf(GFP_KERNEL, "vfio-amba-%08x", adev->periphid);
+ if (!vdev->name) {
+ kfree(vdev);
+ return -ENOMEM;
+ }
+
+ vdev->opaque = (void *) adev;
+ vdev->flags = VFIO_DEVICE_FLAGS_AMBA;
+ vdev->get_resource = get_amba_resource;
+ vdev->get_irq = get_amba_irq;
+ vdev->parent_module = THIS_MODULE;
+ vdev->reset_required = false;
+
+ ret = vfio_platform_probe_common(vdev, &adev->dev);
+ if (ret) {
+ kfree(vdev->name);
+ kfree(vdev);
+ }
+
+ return ret;
+}
+
+static int vfio_amba_remove(struct amba_device *adev)
+{
+ struct vfio_platform_device *vdev;
+
+ vdev = vfio_platform_remove_common(&adev->dev);
+ if (vdev) {
+ kfree(vdev->name);
+ kfree(vdev);
+ return 0;
+ }
+
+ return -EINVAL;
+}
+
+static const struct amba_id pl330_ids[] = {
+ { 0, 0 },
+};
+
+MODULE_DEVICE_TABLE(amba, pl330_ids);
+
+static struct amba_driver vfio_amba_driver = {
+ .probe = vfio_amba_probe,
+ .remove = vfio_amba_remove,
+ .id_table = pl330_ids,
+ .drv = {
+ .name = "vfio-amba",
+ .owner = THIS_MODULE,
+ },
+};
+
+module_amba_driver(vfio_amba_driver);
+
+MODULE_VERSION(DRIVER_VERSION);
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR(DRIVER_AUTHOR);
+MODULE_DESCRIPTION(DRIVER_DESC);
diff --git a/drivers/vfio/platform/vfio_platform.c b/drivers/vfio/platform/vfio_platform.c
new file mode 100644
index 0000000..6561751
--- /dev/null
+++ b/drivers/vfio/platform/vfio_platform.c
@@ -0,0 +1,108 @@
+/*
+ * Copyright (C) 2013 - Virtual Open Systems
+ * Author: Antonios Motakis <a.motakis@virtualopensystems.com>
+ *
+ * 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.
+ */
+
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/vfio.h>
+#include <linux/platform_device.h>
+
+#include "vfio_platform_private.h"
+
+#define DRIVER_VERSION "0.10"
+#define DRIVER_AUTHOR "Antonios Motakis <a.motakis@virtualopensystems.com>"
+#define DRIVER_DESC "VFIO for platform devices - User Level meta-driver"
+
+static bool reset_required = true;
+module_param(reset_required, bool, 0444);
+MODULE_PARM_DESC(reset_required, "override reset requirement (default: 1)");
+
+/* probing devices from the linux platform bus */
+
+static struct resource *get_platform_resource(struct vfio_platform_device *vdev,
+ int num)
+{
+ struct platform_device *dev = (struct platform_device *) vdev->opaque;
+ int i;
+
+ for (i = 0; i < dev->num_resources; i++) {
+ struct resource *r = &dev->resource[i];
+
+ if (resource_type(r) & (IORESOURCE_MEM|IORESOURCE_IO)) {
+ if (!num)
+ return r;
+
+ num--;
+ }
+ }
+ return NULL;
+}
+
+static int get_platform_irq(struct vfio_platform_device *vdev, int i)
+{
+ struct platform_device *pdev = (struct platform_device *) vdev->opaque;
+
+ return platform_get_irq(pdev, i);
+}
+
+static int vfio_platform_probe(struct platform_device *pdev)
+{
+ struct vfio_platform_device *vdev;
+ int ret;
+
+ vdev = kzalloc(sizeof(*vdev), GFP_KERNEL);
+ if (!vdev)
+ return -ENOMEM;
+
+ vdev->opaque = (void *) pdev;
+ vdev->name = pdev->name;
+ vdev->flags = VFIO_DEVICE_FLAGS_PLATFORM;
+ vdev->get_resource = get_platform_resource;
+ vdev->get_irq = get_platform_irq;
+ vdev->parent_module = THIS_MODULE;
+ vdev->reset_required = reset_required;
+
+ ret = vfio_platform_probe_common(vdev, &pdev->dev);
+ if (ret)
+ kfree(vdev);
+
+ return ret;
+}
+
+static int vfio_platform_remove(struct platform_device *pdev)
+{
+ struct vfio_platform_device *vdev;
+
+ vdev = vfio_platform_remove_common(&pdev->dev);
+ if (vdev) {
+ kfree(vdev);
+ return 0;
+ }
+
+ return -EINVAL;
+}
+
+static struct platform_driver vfio_platform_driver = {
+ .probe = vfio_platform_probe,
+ .remove = vfio_platform_remove,
+ .driver = {
+ .name = "vfio-platform",
+ },
+};
+
+module_platform_driver(vfio_platform_driver);
+
+MODULE_VERSION(DRIVER_VERSION);
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR(DRIVER_AUTHOR);
+MODULE_DESCRIPTION(DRIVER_DESC);
diff --git a/drivers/vfio/platform/vfio_platform_common.c b/drivers/vfio/platform/vfio_platform_common.c
new file mode 100644
index 0000000..c0cd824
--- /dev/null
+++ b/drivers/vfio/platform/vfio_platform_common.c
@@ -0,0 +1,757 @@
+/*
+ * Copyright (C) 2013 - Virtual Open Systems
+ * Author: Antonios Motakis <a.motakis@virtualopensystems.com>
+ *
+ * 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.
+ */
+
+#include <linux/device.h>
+#include <linux/acpi.h>
+#include <linux/iommu.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/pm_runtime.h>
+#include <linux/slab.h>
+#include <linux/types.h>
+#include <linux/uaccess.h>
+#include <linux/vfio.h>
+
+#include "vfio_platform_private.h"
+
+#define DRIVER_VERSION "0.10"
+#define DRIVER_AUTHOR "Antonios Motakis <a.motakis@virtualopensystems.com>"
+#define DRIVER_DESC "VFIO platform base module"
+
+#define VFIO_PLATFORM_IS_ACPI(vdev) ((vdev)->acpihid != NULL)
+
+static LIST_HEAD(reset_list);
+static DEFINE_MUTEX(driver_lock);
+
+static vfio_platform_reset_fn_t vfio_platform_lookup_reset(const char *compat,
+ struct module **module)
+{
+ struct vfio_platform_reset_node *iter;
+ vfio_platform_reset_fn_t reset_fn = NULL;
+
+ mutex_lock(&driver_lock);
+ list_for_each_entry(iter, &reset_list, link) {
+ if (!strcmp(iter->compat, compat) &&
+ try_module_get(iter->owner)) {
+ *module = iter->owner;
+ reset_fn = iter->of_reset;
+ break;
+ }
+ }
+ mutex_unlock(&driver_lock);
+ return reset_fn;
+}
+
+static int vfio_platform_acpi_probe(struct vfio_platform_device *vdev,
+ struct device *dev)
+{
+ struct acpi_device *adev;
+
+ if (acpi_disabled)
+ return -ENOENT;
+
+ adev = ACPI_COMPANION(dev);
+ if (!adev) {
+ pr_err("VFIO: ACPI companion device not found for %s\n",
+ vdev->name);
+ return -ENODEV;
+ }
+
+#ifdef CONFIG_ACPI
+ vdev->acpihid = acpi_device_hid(adev);
+#endif
+ return WARN_ON(!vdev->acpihid) ? -EINVAL : 0;
+}
+
+static int vfio_platform_acpi_call_reset(struct vfio_platform_device *vdev,
+ const char **extra_dbg)
+{
+#ifdef CONFIG_ACPI
+ struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
+ struct device *dev = vdev->device;
+ acpi_handle handle = ACPI_HANDLE(dev);
+ acpi_status acpi_ret;
+
+ acpi_ret = acpi_evaluate_object(handle, "_RST", NULL, &buffer);
+ if (ACPI_FAILURE(acpi_ret)) {
+ if (extra_dbg)
+ *extra_dbg = acpi_format_exception(acpi_ret);
+ return -EINVAL;
+ }
+
+ return 0;
+#else
+ return -ENOENT;
+#endif
+}
+
+static bool vfio_platform_acpi_has_reset(struct vfio_platform_device *vdev)
+{
+#ifdef CONFIG_ACPI
+ struct device *dev = vdev->device;
+ acpi_handle handle = ACPI_HANDLE(dev);
+
+ return acpi_has_method(handle, "_RST");
+#else
+ return false;
+#endif
+}
+
+static bool vfio_platform_has_reset(struct vfio_platform_device *vdev)
+{
+ if (VFIO_PLATFORM_IS_ACPI(vdev))
+ return vfio_platform_acpi_has_reset(vdev);
+
+ return vdev->of_reset ? true : false;
+}
+
+static int vfio_platform_get_reset(struct vfio_platform_device *vdev)
+{
+ if (VFIO_PLATFORM_IS_ACPI(vdev))
+ return vfio_platform_acpi_has_reset(vdev) ? 0 : -ENOENT;
+
+ vdev->of_reset = vfio_platform_lookup_reset(vdev->compat,
+ &vdev->reset_module);
+ if (!vdev->of_reset) {
+ request_module("vfio-reset:%s", vdev->compat);
+ vdev->of_reset = vfio_platform_lookup_reset(vdev->compat,
+ &vdev->reset_module);
+ }
+
+ return vdev->of_reset ? 0 : -ENOENT;
+}
+
+static void vfio_platform_put_reset(struct vfio_platform_device *vdev)
+{
+ if (VFIO_PLATFORM_IS_ACPI(vdev))
+ return;
+
+ if (vdev->of_reset)
+ module_put(vdev->reset_module);
+}
+
+static int vfio_platform_regions_init(struct vfio_platform_device *vdev)
+{
+ int cnt = 0, i;
+
+ while (vdev->get_resource(vdev, cnt))
+ cnt++;
+
+ vdev->regions = kcalloc(cnt, sizeof(struct vfio_platform_region),
+ GFP_KERNEL);
+ if (!vdev->regions)
+ return -ENOMEM;
+
+ for (i = 0; i < cnt; i++) {
+ struct resource *res =
+ vdev->get_resource(vdev, i);
+
+ if (!res)
+ goto err;
+
+ vdev->regions[i].addr = res->start;
+ vdev->regions[i].size = resource_size(res);
+ vdev->regions[i].flags = 0;
+
+ switch (resource_type(res)) {
+ case IORESOURCE_MEM:
+ vdev->regions[i].type = VFIO_PLATFORM_REGION_TYPE_MMIO;
+ vdev->regions[i].flags |= VFIO_REGION_INFO_FLAG_READ;
+ if (!(res->flags & IORESOURCE_READONLY))
+ vdev->regions[i].flags |=
+ VFIO_REGION_INFO_FLAG_WRITE;
+
+ /*
+ * Only regions addressed with PAGE granularity may be
+ * MMAPed securely.
+ */
+ if (!(vdev->regions[i].addr & ~PAGE_MASK) &&
+ !(vdev->regions[i].size & ~PAGE_MASK))
+ vdev->regions[i].flags |=
+ VFIO_REGION_INFO_FLAG_MMAP;
+
+ break;
+ case IORESOURCE_IO:
+ vdev->regions[i].type = VFIO_PLATFORM_REGION_TYPE_PIO;
+ break;
+ default:
+ goto err;
+ }
+ }
+
+ vdev->num_regions = cnt;
+
+ return 0;
+err:
+ kfree(vdev->regions);
+ return -EINVAL;
+}
+
+static void vfio_platform_regions_cleanup(struct vfio_platform_device *vdev)
+{
+ int i;
+
+ for (i = 0; i < vdev->num_regions; i++)
+ iounmap(vdev->regions[i].ioaddr);
+
+ vdev->num_regions = 0;
+ kfree(vdev->regions);
+}
+
+static int vfio_platform_call_reset(struct vfio_platform_device *vdev,
+ const char **extra_dbg)
+{
+ if (VFIO_PLATFORM_IS_ACPI(vdev)) {
+ dev_info(vdev->device, "reset\n");
+ return vfio_platform_acpi_call_reset(vdev, extra_dbg);
+ } else if (vdev->of_reset) {
+ dev_info(vdev->device, "reset\n");
+ return vdev->of_reset(vdev);
+ }
+
+ dev_warn(vdev->device, "no reset function found!\n");
+ return -EINVAL;
+}
+
+static void vfio_platform_release(void *device_data)
+{
+ struct vfio_platform_device *vdev = device_data;
+
+ mutex_lock(&driver_lock);
+
+ if (!(--vdev->refcnt)) {
+ const char *extra_dbg = NULL;
+ int ret;
+
+ ret = vfio_platform_call_reset(vdev, &extra_dbg);
+ if (ret && vdev->reset_required) {
+ dev_warn(vdev->device, "reset driver is required and reset call failed in release (%d) %s\n",
+ ret, extra_dbg ? extra_dbg : "");
+ WARN_ON(1);
+ }
+ pm_runtime_put(vdev->device);
+ vfio_platform_regions_cleanup(vdev);
+ vfio_platform_irq_cleanup(vdev);
+ }
+
+ mutex_unlock(&driver_lock);
+
+ module_put(vdev->parent_module);
+}
+
+static int vfio_platform_open(void *device_data)
+{
+ struct vfio_platform_device *vdev = device_data;
+ int ret;
+
+ if (!try_module_get(vdev->parent_module))
+ return -ENODEV;
+
+ mutex_lock(&driver_lock);
+
+ if (!vdev->refcnt) {
+ const char *extra_dbg = NULL;
+
+ ret = vfio_platform_regions_init(vdev);
+ if (ret)
+ goto err_reg;
+
+ ret = vfio_platform_irq_init(vdev);
+ if (ret)
+ goto err_irq;
+
+ ret = pm_runtime_get_sync(vdev->device);
+ if (ret < 0)
+ goto err_pm;
+
+ ret = vfio_platform_call_reset(vdev, &extra_dbg);
+ if (ret && vdev->reset_required) {
+ dev_warn(vdev->device, "reset driver is required and reset call failed in open (%d) %s\n",
+ ret, extra_dbg ? extra_dbg : "");
+ goto err_rst;
+ }
+ }
+
+ vdev->refcnt++;
+
+ mutex_unlock(&driver_lock);
+ return 0;
+
+err_rst:
+ pm_runtime_put(vdev->device);
+err_pm:
+ vfio_platform_irq_cleanup(vdev);
+err_irq:
+ vfio_platform_regions_cleanup(vdev);
+err_reg:
+ mutex_unlock(&driver_lock);
+ module_put(THIS_MODULE);
+ return ret;
+}
+
+static long vfio_platform_ioctl(void *device_data,
+ unsigned int cmd, unsigned long arg)
+{
+ struct vfio_platform_device *vdev = device_data;
+ unsigned long minsz;
+
+ if (cmd == VFIO_DEVICE_GET_INFO) {
+ struct vfio_device_info info;
+
+ minsz = offsetofend(struct vfio_device_info, num_irqs);
+
+ if (copy_from_user(&info, (void __user *)arg, minsz))
+ return -EFAULT;
+
+ if (info.argsz < minsz)
+ return -EINVAL;
+
+ if (vfio_platform_has_reset(vdev))
+ vdev->flags |= VFIO_DEVICE_FLAGS_RESET;
+ info.flags = vdev->flags;
+ info.num_regions = vdev->num_regions;
+ info.num_irqs = vdev->num_irqs;
+
+ return copy_to_user((void __user *)arg, &info, minsz) ?
+ -EFAULT : 0;
+
+ } else if (cmd == VFIO_DEVICE_GET_REGION_INFO) {
+ struct vfio_region_info info;
+
+ minsz = offsetofend(struct vfio_region_info, offset);
+
+ if (copy_from_user(&info, (void __user *)arg, minsz))
+ return -EFAULT;
+
+ if (info.argsz < minsz)
+ return -EINVAL;
+
+ if (info.index >= vdev->num_regions)
+ return -EINVAL;
+
+ /* map offset to the physical address */
+ info.offset = VFIO_PLATFORM_INDEX_TO_OFFSET(info.index);
+ info.size = vdev->regions[info.index].size;
+ info.flags = vdev->regions[info.index].flags;
+
+ return copy_to_user((void __user *)arg, &info, minsz) ?
+ -EFAULT : 0;
+
+ } else if (cmd == VFIO_DEVICE_GET_IRQ_INFO) {
+ struct vfio_irq_info info;
+
+ minsz = offsetofend(struct vfio_irq_info, count);
+
+ if (copy_from_user(&info, (void __user *)arg, minsz))
+ return -EFAULT;
+
+ if (info.argsz < minsz)
+ return -EINVAL;
+
+ if (info.index >= vdev->num_irqs)
+ return -EINVAL;
+
+ info.flags = vdev->irqs[info.index].flags;
+ info.count = vdev->irqs[info.index].count;
+
+ return copy_to_user((void __user *)arg, &info, minsz) ?
+ -EFAULT : 0;
+
+ } else if (cmd == VFIO_DEVICE_SET_IRQS) {
+ struct vfio_irq_set hdr;
+ u8 *data = NULL;
+ int ret = 0;
+ size_t data_size = 0;
+
+ minsz = offsetofend(struct vfio_irq_set, count);
+
+ if (copy_from_user(&hdr, (void __user *)arg, minsz))
+ return -EFAULT;
+
+ ret = vfio_set_irqs_validate_and_prepare(&hdr, vdev->num_irqs,
+ vdev->num_irqs, &data_size);
+ if (ret)
+ return ret;
+
+ if (data_size) {
+ data = memdup_user((void __user *)(arg + minsz),
+ data_size);
+ if (IS_ERR(data))
+ return PTR_ERR(data);
+ }
+
+ mutex_lock(&vdev->igate);
+
+ ret = vfio_platform_set_irqs_ioctl(vdev, hdr.flags, hdr.index,
+ hdr.start, hdr.count, data);
+ mutex_unlock(&vdev->igate);
+ kfree(data);
+
+ return ret;
+
+ } else if (cmd == VFIO_DEVICE_RESET) {
+ return vfio_platform_call_reset(vdev, NULL);
+ }
+
+ return -ENOTTY;
+}
+
+static ssize_t vfio_platform_read_mmio(struct vfio_platform_region *reg,
+ char __user *buf, size_t count,
+ loff_t off)
+{
+ unsigned int done = 0;
+
+ if (!reg->ioaddr) {
+ reg->ioaddr =
+ ioremap_nocache(reg->addr, reg->size);
+
+ if (!reg->ioaddr)
+ return -ENOMEM;
+ }
+
+ while (count) {
+ size_t filled;
+
+ if (count >= 4 && !(off % 4)) {
+ u32 val;
+
+ val = ioread32(reg->ioaddr + off);
+ if (copy_to_user(buf, &val, 4))
+ goto err;
+
+ filled = 4;
+ } else if (count >= 2 && !(off % 2)) {
+ u16 val;
+
+ val = ioread16(reg->ioaddr + off);
+ if (copy_to_user(buf, &val, 2))
+ goto err;
+
+ filled = 2;
+ } else {
+ u8 val;
+
+ val = ioread8(reg->ioaddr + off);
+ if (copy_to_user(buf, &val, 1))
+ goto err;
+
+ filled = 1;
+ }
+
+
+ count -= filled;
+ done += filled;
+ off += filled;
+ buf += filled;
+ }
+
+ return done;
+err:
+ return -EFAULT;
+}
+
+static ssize_t vfio_platform_read(void *device_data, char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ struct vfio_platform_device *vdev = device_data;
+ unsigned int index = VFIO_PLATFORM_OFFSET_TO_INDEX(*ppos);
+ loff_t off = *ppos & VFIO_PLATFORM_OFFSET_MASK;
+
+ if (index >= vdev->num_regions)
+ return -EINVAL;
+
+ if (!(vdev->regions[index].flags & VFIO_REGION_INFO_FLAG_READ))
+ return -EINVAL;
+
+ if (vdev->regions[index].type & VFIO_PLATFORM_REGION_TYPE_MMIO)
+ return vfio_platform_read_mmio(&vdev->regions[index],
+ buf, count, off);
+ else if (vdev->regions[index].type & VFIO_PLATFORM_REGION_TYPE_PIO)
+ return -EINVAL; /* not implemented */
+
+ return -EINVAL;
+}
+
+static ssize_t vfio_platform_write_mmio(struct vfio_platform_region *reg,
+ const char __user *buf, size_t count,
+ loff_t off)
+{
+ unsigned int done = 0;
+
+ if (!reg->ioaddr) {
+ reg->ioaddr =
+ ioremap_nocache(reg->addr, reg->size);
+
+ if (!reg->ioaddr)
+ return -ENOMEM;
+ }
+
+ while (count) {
+ size_t filled;
+
+ if (count >= 4 && !(off % 4)) {
+ u32 val;
+
+ if (copy_from_user(&val, buf, 4))
+ goto err;
+ iowrite32(val, reg->ioaddr + off);
+
+ filled = 4;
+ } else if (count >= 2 && !(off % 2)) {
+ u16 val;
+
+ if (copy_from_user(&val, buf, 2))
+ goto err;
+ iowrite16(val, reg->ioaddr + off);
+
+ filled = 2;
+ } else {
+ u8 val;
+
+ if (copy_from_user(&val, buf, 1))
+ goto err;
+ iowrite8(val, reg->ioaddr + off);
+
+ filled = 1;
+ }
+
+ count -= filled;
+ done += filled;
+ off += filled;
+ buf += filled;
+ }
+
+ return done;
+err:
+ return -EFAULT;
+}
+
+static ssize_t vfio_platform_write(void *device_data, const char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ struct vfio_platform_device *vdev = device_data;
+ unsigned int index = VFIO_PLATFORM_OFFSET_TO_INDEX(*ppos);
+ loff_t off = *ppos & VFIO_PLATFORM_OFFSET_MASK;
+
+ if (index >= vdev->num_regions)
+ return -EINVAL;
+
+ if (!(vdev->regions[index].flags & VFIO_REGION_INFO_FLAG_WRITE))
+ return -EINVAL;
+
+ if (vdev->regions[index].type & VFIO_PLATFORM_REGION_TYPE_MMIO)
+ return vfio_platform_write_mmio(&vdev->regions[index],
+ buf, count, off);
+ else if (vdev->regions[index].type & VFIO_PLATFORM_REGION_TYPE_PIO)
+ return -EINVAL; /* not implemented */
+
+ return -EINVAL;
+}
+
+static int vfio_platform_mmap_mmio(struct vfio_platform_region region,
+ struct vm_area_struct *vma)
+{
+ u64 req_len, pgoff, req_start;
+
+ req_len = vma->vm_end - vma->vm_start;
+ pgoff = vma->vm_pgoff &
+ ((1U << (VFIO_PLATFORM_OFFSET_SHIFT - PAGE_SHIFT)) - 1);
+ req_start = pgoff << PAGE_SHIFT;
+
+ if (region.size < PAGE_SIZE || req_start + req_len > region.size)
+ return -EINVAL;
+
+ vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
+ vma->vm_pgoff = (region.addr >> PAGE_SHIFT) + pgoff;
+
+ return remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
+ req_len, vma->vm_page_prot);
+}
+
+static int vfio_platform_mmap(void *device_data, struct vm_area_struct *vma)
+{
+ struct vfio_platform_device *vdev = device_data;
+ unsigned int index;
+
+ index = vma->vm_pgoff >> (VFIO_PLATFORM_OFFSET_SHIFT - PAGE_SHIFT);
+
+ if (vma->vm_end < vma->vm_start)
+ return -EINVAL;
+ if (!(vma->vm_flags & VM_SHARED))
+ return -EINVAL;
+ if (index >= vdev->num_regions)
+ return -EINVAL;
+ if (vma->vm_start & ~PAGE_MASK)
+ return -EINVAL;
+ if (vma->vm_end & ~PAGE_MASK)
+ return -EINVAL;
+
+ if (!(vdev->regions[index].flags & VFIO_REGION_INFO_FLAG_MMAP))
+ return -EINVAL;
+
+ if (!(vdev->regions[index].flags & VFIO_REGION_INFO_FLAG_READ)
+ && (vma->vm_flags & VM_READ))
+ return -EINVAL;
+
+ if (!(vdev->regions[index].flags & VFIO_REGION_INFO_FLAG_WRITE)
+ && (vma->vm_flags & VM_WRITE))
+ return -EINVAL;
+
+ vma->vm_private_data = vdev;
+
+ if (vdev->regions[index].type & VFIO_PLATFORM_REGION_TYPE_MMIO)
+ return vfio_platform_mmap_mmio(vdev->regions[index], vma);
+
+ else if (vdev->regions[index].type & VFIO_PLATFORM_REGION_TYPE_PIO)
+ return -EINVAL; /* not implemented */
+
+ return -EINVAL;
+}
+
+static const struct vfio_device_ops vfio_platform_ops = {
+ .name = "vfio-platform",
+ .open = vfio_platform_open,
+ .release = vfio_platform_release,
+ .ioctl = vfio_platform_ioctl,
+ .read = vfio_platform_read,
+ .write = vfio_platform_write,
+ .mmap = vfio_platform_mmap,
+};
+
+static int vfio_platform_of_probe(struct vfio_platform_device *vdev,
+ struct device *dev)
+{
+ int ret;
+
+ ret = device_property_read_string(dev, "compatible",
+ &vdev->compat);
+ if (ret)
+ pr_err("VFIO: Cannot retrieve compat for %s\n", vdev->name);
+
+ return ret;
+}
+
+/*
+ * There can be two kernel build combinations. One build where
+ * ACPI is not selected in Kconfig and another one with the ACPI Kconfig.
+ *
+ * In the first case, vfio_platform_acpi_probe will return since
+ * acpi_disabled is 1. DT user will not see any kind of messages from
+ * ACPI.
+ *
+ * In the second case, both DT and ACPI is compiled in but the system is
+ * booting with any of these combinations.
+ *
+ * If the firmware is DT type, then acpi_disabled is 1. The ACPI probe routine
+ * terminates immediately without any messages.
+ *
+ * If the firmware is ACPI type, then acpi_disabled is 0. All other checks are
+ * valid checks. We cannot claim that this system is DT.
+ */
+int vfio_platform_probe_common(struct vfio_platform_device *vdev,
+ struct device *dev)
+{
+ struct iommu_group *group;
+ int ret;
+
+ if (!vdev)
+ return -EINVAL;
+
+ ret = vfio_platform_acpi_probe(vdev, dev);
+ if (ret)
+ ret = vfio_platform_of_probe(vdev, dev);
+
+ if (ret)
+ return ret;
+
+ vdev->device = dev;
+
+ ret = vfio_platform_get_reset(vdev);
+ if (ret && vdev->reset_required) {
+ pr_err("VFIO: No reset function found for device %s\n",
+ vdev->name);
+ return ret;
+ }
+
+ group = vfio_iommu_group_get(dev);
+ if (!group) {
+ pr_err("VFIO: No IOMMU group for device %s\n", vdev->name);
+ ret = -EINVAL;
+ goto put_reset;
+ }
+
+ ret = vfio_add_group_dev(dev, &vfio_platform_ops, vdev);
+ if (ret)
+ goto put_iommu;
+
+ mutex_init(&vdev->igate);
+
+ pm_runtime_enable(vdev->device);
+ return 0;
+
+put_iommu:
+ vfio_iommu_group_put(group, dev);
+put_reset:
+ vfio_platform_put_reset(vdev);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(vfio_platform_probe_common);
+
+struct vfio_platform_device *vfio_platform_remove_common(struct device *dev)
+{
+ struct vfio_platform_device *vdev;
+
+ vdev = vfio_del_group_dev(dev);
+
+ if (vdev) {
+ pm_runtime_disable(vdev->device);
+ vfio_platform_put_reset(vdev);
+ vfio_iommu_group_put(dev->iommu_group, dev);
+ }
+
+ return vdev;
+}
+EXPORT_SYMBOL_GPL(vfio_platform_remove_common);
+
+void __vfio_platform_register_reset(struct vfio_platform_reset_node *node)
+{
+ mutex_lock(&driver_lock);
+ list_add(&node->link, &reset_list);
+ mutex_unlock(&driver_lock);
+}
+EXPORT_SYMBOL_GPL(__vfio_platform_register_reset);
+
+void vfio_platform_unregister_reset(const char *compat,
+ vfio_platform_reset_fn_t fn)
+{
+ struct vfio_platform_reset_node *iter, *temp;
+
+ mutex_lock(&driver_lock);
+ list_for_each_entry_safe(iter, temp, &reset_list, link) {
+ if (!strcmp(iter->compat, compat) && (iter->of_reset == fn)) {
+ list_del(&iter->link);
+ break;
+ }
+ }
+
+ mutex_unlock(&driver_lock);
+
+}
+EXPORT_SYMBOL_GPL(vfio_platform_unregister_reset);
+
+MODULE_VERSION(DRIVER_VERSION);
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR(DRIVER_AUTHOR);
+MODULE_DESCRIPTION(DRIVER_DESC);
diff --git a/drivers/vfio/platform/vfio_platform_irq.c b/drivers/vfio/platform/vfio_platform_irq.c
new file mode 100644
index 0000000..46d4750
--- /dev/null
+++ b/drivers/vfio/platform/vfio_platform_irq.c
@@ -0,0 +1,337 @@
+/*
+ * VFIO platform devices interrupt handling
+ *
+ * Copyright (C) 2013 - Virtual Open Systems
+ * Author: Antonios Motakis <a.motakis@virtualopensystems.com>
+ *
+ * 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.
+ */
+
+#include <linux/eventfd.h>
+#include <linux/interrupt.h>
+#include <linux/slab.h>
+#include <linux/types.h>
+#include <linux/vfio.h>
+#include <linux/irq.h>
+
+#include "vfio_platform_private.h"
+
+static void vfio_platform_mask(struct vfio_platform_irq *irq_ctx)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&irq_ctx->lock, flags);
+
+ if (!irq_ctx->masked) {
+ disable_irq_nosync(irq_ctx->hwirq);
+ irq_ctx->masked = true;
+ }
+
+ spin_unlock_irqrestore(&irq_ctx->lock, flags);
+}
+
+static int vfio_platform_mask_handler(void *opaque, void *unused)
+{
+ struct vfio_platform_irq *irq_ctx = opaque;
+
+ vfio_platform_mask(irq_ctx);
+
+ return 0;
+}
+
+static int vfio_platform_set_irq_mask(struct vfio_platform_device *vdev,
+ unsigned index, unsigned start,
+ unsigned count, uint32_t flags,
+ void *data)
+{
+ if (start != 0 || count != 1)
+ return -EINVAL;
+
+ if (!(vdev->irqs[index].flags & VFIO_IRQ_INFO_MASKABLE))
+ return -EINVAL;
+
+ if (flags & VFIO_IRQ_SET_DATA_EVENTFD) {
+ int32_t fd = *(int32_t *)data;
+
+ if (fd >= 0)
+ return vfio_virqfd_enable((void *) &vdev->irqs[index],
+ vfio_platform_mask_handler,
+ NULL, NULL,
+ &vdev->irqs[index].mask, fd);
+
+ vfio_virqfd_disable(&vdev->irqs[index].mask);
+ return 0;
+ }
+
+ if (flags & VFIO_IRQ_SET_DATA_NONE) {
+ vfio_platform_mask(&vdev->irqs[index]);
+
+ } else if (flags & VFIO_IRQ_SET_DATA_BOOL) {
+ uint8_t mask = *(uint8_t *)data;
+
+ if (mask)
+ vfio_platform_mask(&vdev->irqs[index]);
+ }
+
+ return 0;
+}
+
+static void vfio_platform_unmask(struct vfio_platform_irq *irq_ctx)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&irq_ctx->lock, flags);
+
+ if (irq_ctx->masked) {
+ enable_irq(irq_ctx->hwirq);
+ irq_ctx->masked = false;
+ }
+
+ spin_unlock_irqrestore(&irq_ctx->lock, flags);
+}
+
+static int vfio_platform_unmask_handler(void *opaque, void *unused)
+{
+ struct vfio_platform_irq *irq_ctx = opaque;
+
+ vfio_platform_unmask(irq_ctx);
+
+ return 0;
+}
+
+static int vfio_platform_set_irq_unmask(struct vfio_platform_device *vdev,
+ unsigned index, unsigned start,
+ unsigned count, uint32_t flags,
+ void *data)
+{
+ if (start != 0 || count != 1)
+ return -EINVAL;
+
+ if (!(vdev->irqs[index].flags & VFIO_IRQ_INFO_MASKABLE))
+ return -EINVAL;
+
+ if (flags & VFIO_IRQ_SET_DATA_EVENTFD) {
+ int32_t fd = *(int32_t *)data;
+
+ if (fd >= 0)
+ return vfio_virqfd_enable((void *) &vdev->irqs[index],
+ vfio_platform_unmask_handler,
+ NULL, NULL,
+ &vdev->irqs[index].unmask,
+ fd);
+
+ vfio_virqfd_disable(&vdev->irqs[index].unmask);
+ return 0;
+ }
+
+ if (flags & VFIO_IRQ_SET_DATA_NONE) {
+ vfio_platform_unmask(&vdev->irqs[index]);
+
+ } else if (flags & VFIO_IRQ_SET_DATA_BOOL) {
+ uint8_t unmask = *(uint8_t *)data;
+
+ if (unmask)
+ vfio_platform_unmask(&vdev->irqs[index]);
+ }
+
+ return 0;
+}
+
+static irqreturn_t vfio_automasked_irq_handler(int irq, void *dev_id)
+{
+ struct vfio_platform_irq *irq_ctx = dev_id;
+ unsigned long flags;
+ int ret = IRQ_NONE;
+
+ spin_lock_irqsave(&irq_ctx->lock, flags);
+
+ if (!irq_ctx->masked) {
+ ret = IRQ_HANDLED;
+
+ /* automask maskable interrupts */
+ disable_irq_nosync(irq_ctx->hwirq);
+ irq_ctx->masked = true;
+ }
+
+ spin_unlock_irqrestore(&irq_ctx->lock, flags);
+
+ if (ret == IRQ_HANDLED)
+ eventfd_signal(irq_ctx->trigger, 1);
+
+ return ret;
+}
+
+static irqreturn_t vfio_irq_handler(int irq, void *dev_id)
+{
+ struct vfio_platform_irq *irq_ctx = dev_id;
+
+ eventfd_signal(irq_ctx->trigger, 1);
+
+ return IRQ_HANDLED;
+}
+
+static int vfio_set_trigger(struct vfio_platform_device *vdev, int index,
+ int fd, irq_handler_t handler)
+{
+ struct vfio_platform_irq *irq = &vdev->irqs[index];
+ struct eventfd_ctx *trigger;
+ int ret;
+
+ if (irq->trigger) {
+ irq_clear_status_flags(irq->hwirq, IRQ_NOAUTOEN);
+ free_irq(irq->hwirq, irq);
+ kfree(irq->name);
+ eventfd_ctx_put(irq->trigger);
+ irq->trigger = NULL;
+ }
+
+ if (fd < 0) /* Disable only */
+ return 0;
+
+ irq->name = kasprintf(GFP_KERNEL, "vfio-irq[%d](%s)",
+ irq->hwirq, vdev->name);
+ if (!irq->name)
+ return -ENOMEM;
+
+ trigger = eventfd_ctx_fdget(fd);
+ if (IS_ERR(trigger)) {
+ kfree(irq->name);
+ return PTR_ERR(trigger);
+ }
+
+ irq->trigger = trigger;
+
+ irq_set_status_flags(irq->hwirq, IRQ_NOAUTOEN);
+ ret = request_irq(irq->hwirq, handler, 0, irq->name, irq);
+ if (ret) {
+ kfree(irq->name);
+ eventfd_ctx_put(trigger);
+ irq->trigger = NULL;
+ return ret;
+ }
+
+ if (!irq->masked)
+ enable_irq(irq->hwirq);
+
+ return 0;
+}
+
+static int vfio_platform_set_irq_trigger(struct vfio_platform_device *vdev,
+ unsigned index, unsigned start,
+ unsigned count, uint32_t flags,
+ void *data)
+{
+ struct vfio_platform_irq *irq = &vdev->irqs[index];
+ irq_handler_t handler;
+
+ if (vdev->irqs[index].flags & VFIO_IRQ_INFO_AUTOMASKED)
+ handler = vfio_automasked_irq_handler;
+ else
+ handler = vfio_irq_handler;
+
+ if (!count && (flags & VFIO_IRQ_SET_DATA_NONE))
+ return vfio_set_trigger(vdev, index, -1, handler);
+
+ if (start != 0 || count != 1)
+ return -EINVAL;
+
+ if (flags & VFIO_IRQ_SET_DATA_EVENTFD) {
+ int32_t fd = *(int32_t *)data;
+
+ return vfio_set_trigger(vdev, index, fd, handler);
+ }
+
+ if (flags & VFIO_IRQ_SET_DATA_NONE) {
+ handler(irq->hwirq, irq);
+
+ } else if (flags & VFIO_IRQ_SET_DATA_BOOL) {
+ uint8_t trigger = *(uint8_t *)data;
+
+ if (trigger)
+ handler(irq->hwirq, irq);
+ }
+
+ return 0;
+}
+
+int vfio_platform_set_irqs_ioctl(struct vfio_platform_device *vdev,
+ uint32_t flags, unsigned index, unsigned start,
+ unsigned count, void *data)
+{
+ int (*func)(struct vfio_platform_device *vdev, unsigned index,
+ unsigned start, unsigned count, uint32_t flags,
+ void *data) = NULL;
+
+ switch (flags & VFIO_IRQ_SET_ACTION_TYPE_MASK) {
+ case VFIO_IRQ_SET_ACTION_MASK:
+ func = vfio_platform_set_irq_mask;
+ break;
+ case VFIO_IRQ_SET_ACTION_UNMASK:
+ func = vfio_platform_set_irq_unmask;
+ break;
+ case VFIO_IRQ_SET_ACTION_TRIGGER:
+ func = vfio_platform_set_irq_trigger;
+ break;
+ }
+
+ if (!func)
+ return -ENOTTY;
+
+ return func(vdev, index, start, count, flags, data);
+}
+
+int vfio_platform_irq_init(struct vfio_platform_device *vdev)
+{
+ int cnt = 0, i;
+
+ while (vdev->get_irq(vdev, cnt) >= 0)
+ cnt++;
+
+ vdev->irqs = kcalloc(cnt, sizeof(struct vfio_platform_irq), GFP_KERNEL);
+ if (!vdev->irqs)
+ return -ENOMEM;
+
+ for (i = 0; i < cnt; i++) {
+ int hwirq = vdev->get_irq(vdev, i);
+
+ if (hwirq < 0)
+ goto err;
+
+ spin_lock_init(&vdev->irqs[i].lock);
+
+ vdev->irqs[i].flags = VFIO_IRQ_INFO_EVENTFD;
+
+ if (irq_get_trigger_type(hwirq) & IRQ_TYPE_LEVEL_MASK)
+ vdev->irqs[i].flags |= VFIO_IRQ_INFO_MASKABLE
+ | VFIO_IRQ_INFO_AUTOMASKED;
+
+ vdev->irqs[i].count = 1;
+ vdev->irqs[i].hwirq = hwirq;
+ vdev->irqs[i].masked = false;
+ }
+
+ vdev->num_irqs = cnt;
+
+ return 0;
+err:
+ kfree(vdev->irqs);
+ return -EINVAL;
+}
+
+void vfio_platform_irq_cleanup(struct vfio_platform_device *vdev)
+{
+ int i;
+
+ for (i = 0; i < vdev->num_irqs; i++)
+ vfio_set_trigger(vdev, i, -1, NULL);
+
+ vdev->num_irqs = 0;
+ kfree(vdev->irqs);
+}
diff --git a/drivers/vfio/platform/vfio_platform_private.h b/drivers/vfio/platform/vfio_platform_private.h
new file mode 100644
index 0000000..85ffe5d
--- /dev/null
+++ b/drivers/vfio/platform/vfio_platform_private.h
@@ -0,0 +1,127 @@
+/*
+ * Copyright (C) 2013 - Virtual Open Systems
+ * Author: Antonios Motakis <a.motakis@virtualopensystems.com>
+ *
+ * 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.
+ */
+
+#ifndef VFIO_PLATFORM_PRIVATE_H
+#define VFIO_PLATFORM_PRIVATE_H
+
+#include <linux/types.h>
+#include <linux/interrupt.h>
+
+#define VFIO_PLATFORM_OFFSET_SHIFT 40
+#define VFIO_PLATFORM_OFFSET_MASK (((u64)(1) << VFIO_PLATFORM_OFFSET_SHIFT) - 1)
+
+#define VFIO_PLATFORM_OFFSET_TO_INDEX(off) \
+ (off >> VFIO_PLATFORM_OFFSET_SHIFT)
+
+#define VFIO_PLATFORM_INDEX_TO_OFFSET(index) \
+ ((u64)(index) << VFIO_PLATFORM_OFFSET_SHIFT)
+
+struct vfio_platform_irq {
+ u32 flags;
+ u32 count;
+ int hwirq;
+ char *name;
+ struct eventfd_ctx *trigger;
+ bool masked;
+ spinlock_t lock;
+ struct virqfd *unmask;
+ struct virqfd *mask;
+};
+
+struct vfio_platform_region {
+ u64 addr;
+ resource_size_t size;
+ u32 flags;
+ u32 type;
+#define VFIO_PLATFORM_REGION_TYPE_MMIO 1
+#define VFIO_PLATFORM_REGION_TYPE_PIO 2
+ void __iomem *ioaddr;
+};
+
+struct vfio_platform_device {
+ struct vfio_platform_region *regions;
+ u32 num_regions;
+ struct vfio_platform_irq *irqs;
+ u32 num_irqs;
+ int refcnt;
+ struct mutex igate;
+ struct module *parent_module;
+ const char *compat;
+ const char *acpihid;
+ struct module *reset_module;
+ struct device *device;
+
+ /*
+ * These fields should be filled by the bus specific binder
+ */
+ void *opaque;
+ const char *name;
+ uint32_t flags;
+ /* callbacks to discover device resources */
+ struct resource*
+ (*get_resource)(struct vfio_platform_device *vdev, int i);
+ int (*get_irq)(struct vfio_platform_device *vdev, int i);
+ int (*of_reset)(struct vfio_platform_device *vdev);
+
+ bool reset_required;
+};
+
+typedef int (*vfio_platform_reset_fn_t)(struct vfio_platform_device *vdev);
+
+struct vfio_platform_reset_node {
+ struct list_head link;
+ char *compat;
+ struct module *owner;
+ vfio_platform_reset_fn_t of_reset;
+};
+
+extern int vfio_platform_probe_common(struct vfio_platform_device *vdev,
+ struct device *dev);
+extern struct vfio_platform_device *vfio_platform_remove_common
+ (struct device *dev);
+
+extern int vfio_platform_irq_init(struct vfio_platform_device *vdev);
+extern void vfio_platform_irq_cleanup(struct vfio_platform_device *vdev);
+
+extern int vfio_platform_set_irqs_ioctl(struct vfio_platform_device *vdev,
+ uint32_t flags, unsigned index,
+ unsigned start, unsigned count,
+ void *data);
+
+extern void __vfio_platform_register_reset(struct vfio_platform_reset_node *n);
+extern void vfio_platform_unregister_reset(const char *compat,
+ vfio_platform_reset_fn_t fn);
+#define vfio_platform_register_reset(__compat, __reset) \
+static struct vfio_platform_reset_node __reset ## _node = { \
+ .owner = THIS_MODULE, \
+ .compat = __compat, \
+ .of_reset = __reset, \
+}; \
+__vfio_platform_register_reset(&__reset ## _node)
+
+#define module_vfio_reset_handler(compat, reset) \
+MODULE_ALIAS("vfio-reset:" compat); \
+static int __init reset ## _module_init(void) \
+{ \
+ vfio_platform_register_reset(compat, reset); \
+ return 0; \
+}; \
+static void __exit reset ## _module_exit(void) \
+{ \
+ vfio_platform_unregister_reset(compat, reset); \
+}; \
+module_init(reset ## _module_init); \
+module_exit(reset ## _module_exit)
+
+#endif /* VFIO_PLATFORM_PRIVATE_H */