linux-kernel - [RFC v4 3/3] vfio: platform: reset: add msi support

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Message-Id: <20210129172421.43299-4-vikas.gupta@broadcom.com>
Date:   Fri, 29 Jan 2021 22:54:21 +0530
From:   Vikas Gupta <vikas.gupta@...adcom.com>
To:     eric.auger@...hat.com, alex.williamson@...hat.com,
        cohuck@...hat.com, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     vikram.prakash@...adcom.com, srinath.mannam@...adcom.com,
        ashwin.kamath@...adcom.com, zachary.schroff@...adcom.com,
        manish.kurup@...adcom.com, Vikas Gupta <vikas.gupta@...adcom.com>
Subject: [RFC v4 3/3] vfio: platform: reset: add msi support

Add msi support for Broadcom FlexRm device.

Signed-off-by: Vikas Gupta <vikas.gupta@...adcom.com>
---
 .../platform/reset/vfio_platform_bcmflexrm.c  | 72 ++++++++++++++++++-
 1 file changed, 70 insertions(+), 2 deletions(-)

diff --git a/drivers/vfio/platform/reset/vfio_platform_bcmflexrm.c b/drivers/vfio/platform/reset/vfio_platform_bcmflexrm.c
index 96064ef8f629..6ca4ca12575b 100644
--- a/drivers/vfio/platform/reset/vfio_platform_bcmflexrm.c
+++ b/drivers/vfio/platform/reset/vfio_platform_bcmflexrm.c
@@ -21,7 +21,9 @@
 #include <linux/init.h>
 #include <linux/io.h>
 #include <linux/kernel.h>
+#include <linux/msi.h>
 #include <linux/module.h>
+#include <linux/vfio.h>
 
 #include "../vfio_platform_private.h"
 
@@ -33,6 +35,9 @@
 #define RING_VER					0x000
 #define RING_CONTROL					0x034
 #define RING_FLUSH_DONE					0x038
+#define RING_MSI_ADDR_LS				0x03c
+#define RING_MSI_ADDR_MS				0x040
+#define RING_MSI_DATA_VALUE				0x064
 
 /* Register RING_CONTROL fields */
 #define CONTROL_FLUSH_SHIFT				5
@@ -105,8 +110,71 @@ static int vfio_platform_bcmflexrm_reset(struct vfio_platform_device *vdev)
 	return ret;
 }
 
-module_vfio_reset_handler("brcm,iproc-flexrm-mbox",
-			  vfio_platform_bcmflexrm_reset);
+static u32 bcm_num_msi(struct vfio_platform_device *vdev)
+{
+	struct vfio_platform_region *reg = &vdev->regions[0];
+
+	return (reg->size / RING_REGS_SIZE);
+}
+
+static void bcm_write_msi(struct vfio_platform_device *vdev,
+		struct msi_desc *desc,
+		struct msi_msg *msg)
+{
+	int i;
+	int hwirq = -1;
+	int msi_src;
+	void __iomem *ring;
+	struct vfio_platform_region *reg = &vdev->regions[0];
+
+	if (!reg)
+		return;
+
+	for (i = 0; i < vdev->num_irqs; i++)
+		if (vdev->irqs[i].type == VFIO_IRQ_TYPE_MSI)
+			hwirq = vdev->irqs[i].ctx[0].hwirq;
+
+	if (hwirq < 0)
+		return;
+
+	msi_src = desc->irq - hwirq;
+
+	if (!reg->ioaddr) {
+		reg->ioaddr = ioremap(reg->addr, reg->size);
+		if (!reg->ioaddr)
+			return;
+	}
+
+	ring = reg->ioaddr + msi_src * RING_REGS_SIZE;
+
+	writel_relaxed(msg->address_lo, ring + RING_MSI_ADDR_LS);
+	writel_relaxed(msg->address_hi, ring + RING_MSI_ADDR_MS);
+	writel_relaxed(msg->data, ring + RING_MSI_DATA_VALUE);
+}
+
+static struct vfio_platform_reset_node vfio_platform_bcmflexrm_reset_node = {
+	.owner = THIS_MODULE,
+	.compat = "brcm,iproc-flexrm-mbox",
+	.of_reset = vfio_platform_bcmflexrm_reset,
+	.of_get_msi = bcm_num_msi,
+	.of_msi_write = bcm_write_msi
+};
+
+static int __init vfio_platform_bcmflexrm_reset_module_init(void)
+{
+	__vfio_platform_register_reset(&vfio_platform_bcmflexrm_reset_node);
+
+	return 0;
+}
+
+static void __exit vfio_platform_bcmflexrm_reset_module_exit(void)
+{
+	vfio_platform_unregister_reset("brcm,iproc-flexrm-mbox",
+				       vfio_platform_bcmflexrm_reset);
+}
+
+module_init(vfio_platform_bcmflexrm_reset_module_init);
+module_exit(vfio_platform_bcmflexrm_reset_module_exit);
 
 MODULE_LICENSE("GPL v2");
 MODULE_AUTHOR("Anup Patel <anup.patel@...adcom.com>");
-- 
2.17.1


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