linux-kernel - [PATCH v5 2/6] vfio: Introduce vGPU display irq type

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Message-Id: <20190816023528.30210-3-tina.zhang@intel.com>
Date:   Fri, 16 Aug 2019 10:35:24 +0800
From:   Tina Zhang <tina.zhang@...el.com>
To:     intel-gvt-dev@...ts.freedesktop.org
Cc:     Tina Zhang <tina.zhang@...el.com>, kraxel@...hat.com,
        alex.williamson@...hat.com, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, hang.yuan@...el.com,
        zhiyuan.lv@...el.com
Subject: [PATCH v5 2/6] vfio: Introduce vGPU display irq type

Introduce vGPU specific irq type VFIO_IRQ_TYPE_GFX, and
VFIO_IRQ_SUBTYPE_GFX_DISPLAY_IRQ as the subtype for vGPU display.

Introduce vfio_irq_info_cap_display_plane_events capability to notify
user space with the vGPU's plane update events

v2:
- Add VFIO_IRQ_SUBTYPE_GFX_DISPLAY_IRQ description. (Alex & Kechen)
- Introduce vfio_irq_info_cap_display_plane_events. (Gerd & Alex)

Signed-off-by: Tina Zhang <tina.zhang@...el.com>
---
 include/uapi/linux/vfio.h | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/include/uapi/linux/vfio.h b/include/uapi/linux/vfio.h
index d83c9f136a5b..21ac69f0e1a9 100644
--- a/include/uapi/linux/vfio.h
+++ b/include/uapi/linux/vfio.h
@@ -465,6 +465,27 @@ struct vfio_irq_info_cap_type {
 	__u32 subtype;  /* type specific */
 };
 
+#define VFIO_IRQ_TYPE_GFX				(1)
+/*
+ * vGPU vendor sub-type
+ * vGPU device display related interrupts e.g. vblank/pageflip
+ */
+#define VFIO_IRQ_SUBTYPE_GFX_DISPLAY_IRQ		(1)
+
+/*
+ * Display capability of using one eventfd to notify user space with the
+ * vGPU's plane update events.
+ * cur_event_val: eventfd value stands for cursor plane change event.
+ * pri_event_val: eventfd value stands for primary plane change event.
+ */
+#define VFIO_IRQ_INFO_CAP_DISPLAY	4
+
+struct vfio_irq_info_cap_display_plane_events {
+	struct vfio_info_cap_header header;
+	__u64 cur_event_val;
+	__u64 pri_event_val;
+};
+
 /**
  * VFIO_DEVICE_SET_IRQS - _IOW(VFIO_TYPE, VFIO_BASE + 10, struct vfio_irq_set)
  *
-- 
2.17.1