[PATCH 1/3] kvm tools, ui: Add framebuffer infrastructure

[Pekka Enberg <penberg@kernel.org>]

This patch introduces 'struct framebuffer' and related API as a preparational
step to killing libvnc dependency from hw/vesa.c.

Cc: Cyrill Gorcunov <gorcunov@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: John Floren <john@jfloren.net>
Cc: Sasha Levin <levinsasha928@gmail.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
---
 tools/kvm/Makefile                  |    1 +
 tools/kvm/framebuffer.c             |   87 +++++++++++++++++++++++++++++++++++
 tools/kvm/include/kvm/framebuffer.h |   35 ++++++++++++++
 3 files changed, 123 insertions(+), 0 deletions(-)
 create mode 100644 tools/kvm/framebuffer.c
 create mode 100644 tools/kvm/include/kvm/framebuffer.h

diff --git a/tools/kvm/Makefile b/tools/kvm/Makefile
index a05a6b1..3f06dab 100644
--- a/tools/kvm/Makefile
+++ b/tools/kvm/Makefile
@@ -17,6 +17,7 @@ TAGS = ctags
 
 OBJS	+= cpuid.o
 OBJS	+= disk/core.o
+OBJS	+= framebuffer.o
 OBJS	+= hw/rtc.o
 OBJS	+= hw/serial.o
 OBJS	+= interrupt.o
diff --git a/tools/kvm/framebuffer.c b/tools/kvm/framebuffer.c
new file mode 100644
index 0000000..eae0a92
--- /dev/null
+++ b/tools/kvm/framebuffer.c
@@ -0,0 +1,87 @@
+#include "kvm/framebuffer.h"
+
+#include <linux/kernel.h>
+#include <linux/list.h>
+#include <stdlib.h>
+
+static LIST_HEAD(framebuffers);
+
+struct framebuffer *fb__register(struct framebuffer *fb)
+{
+	INIT_LIST_HEAD(&fb->node);
+	list_add(&fb->node, &framebuffers);
+
+	return fb;
+}
+
+int fb__attach(struct framebuffer *fb, struct fb_target_operations *ops)
+{
+	if (fb->nr_targets >= FB_MAX_TARGETS)
+		return -1;
+
+	fb->targets[fb->nr_targets++] = ops;
+
+	return 0;
+}
+
+static int start_targets(struct framebuffer *fb)
+{
+	unsigned long i;
+
+	for (i = 0; i < fb->nr_targets; i++) {
+		struct fb_target_operations *ops = fb->targets[i];
+		int err = 0;
+
+		if (ops->start)
+			err = ops->start(fb);
+
+		if (err)
+			return err;
+	}
+
+	return 0;
+}
+
+int fb__start(void)
+{
+	struct framebuffer *fb;
+
+	list_for_each_entry(fb, &framebuffers, node) {
+		int err;
+
+		err = start_targets(fb);
+		if (err)
+			return err;
+	}
+
+	return 0;
+}
+
+void fb__stop(void)
+{
+	struct framebuffer *fb;
+
+	list_for_each_entry(fb, &framebuffers, node) {
+		free(fb->mem);
+	}
+}
+
+static void write_to_targets(struct framebuffer *fb, u64 addr, u8 *data, u32 len)
+{
+	unsigned long i;
+
+	for (i = 0; i < fb->nr_targets; i++) {
+		struct fb_target_operations *ops = fb->targets[i];
+
+		ops->write(fb, addr, data, len);
+	}
+}
+
+void fb__write(u64 addr, u8 *data, u32 len)
+{
+	struct framebuffer *fb;
+
+	list_for_each_entry(fb, &framebuffers, node) {
+		write_to_targets(fb, addr, data, len);
+	}
+}
diff --git a/tools/kvm/include/kvm/framebuffer.h b/tools/kvm/include/kvm/framebuffer.h
new file mode 100644
index 0000000..e2273c5
--- /dev/null
+++ b/tools/kvm/include/kvm/framebuffer.h
@@ -0,0 +1,35 @@
+#ifndef KVM__FRAMEBUFFER_H
+#define KVM__FRAMEBUFFER_H
+
+#include <linux/types.h>
+#include <linux/list.h>
+
+struct framebuffer;
+
+struct fb_target_operations {
+	int (*start)(struct framebuffer *fb);
+	void (*write)(struct framebuffer *fb, u64 addr, u8 *data, u32 len);
+};
+
+#define FB_MAX_TARGETS			2
+
+struct framebuffer {
+	u32				width;
+	u32				height;
+	u8				depth;
+	char				*mem;
+	u64				mem_addr;
+
+	unsigned long			nr_targets;
+	struct fb_target_operations	*targets[FB_MAX_TARGETS];
+
+	struct list_head		node;
+};
+
+struct framebuffer *fb__register(struct framebuffer *fb);
+int fb__attach(struct framebuffer *fb, struct fb_target_operations *ops);
+int fb__start(void);
+void fb__stop(void);
+void fb__write(u64 addr, u8 *data, u32 len);
+
+#endif /* KVM__FRAMEBUFFER_H */
-- 
1.7.0.4