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authorGerd Hoffmann <kraxel@redhat.com>2019-03-11 11:14:39 -0600
committerAlex Williamson <alex.williamson@redhat.com>2019-03-11 12:59:59 -0600
commit08479114b0de29f7cdd6ae20f3490b45753db083 (patch)
tree239f116aefe403f2d4c649d19ec7ca84198f8817 /hw/vfio/display.c
parent2e35c7738e16452a95aec1fbef5e8b6f38a2d647 (diff)
vfio/display: add edid support.
This patch adds EDID support to the vfio display (aka vgpu) code. When supported by the mdev driver qemu will generate a EDID blob and pass it on using the new vfio edid region. The EDID blob will be updated on UI changes (i.e. window resize), so the guest can adapt. Signed-off-by: Gerd Hoffmann <kraxel@redhat.com> Reviewed-by: Liam Merwick <liam.merwick@oracle.com> [remove control flow via macro, use unsigned format specifier] Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Diffstat (limited to 'hw/vfio/display.c')
-rw-r--r--hw/vfio/display.c141
1 files changed, 141 insertions, 0 deletions
diff --git a/hw/vfio/display.c b/hw/vfio/display.c
index dead30e626..276fba090d 100644
--- a/hw/vfio/display.c
+++ b/hw/vfio/display.c
@@ -15,15 +15,153 @@
#include <sys/ioctl.h>
#include "sysemu/sysemu.h"
+#include "hw/display/edid.h"
#include "ui/console.h"
#include "qapi/error.h"
#include "pci.h"
+#include "trace.h"
#ifndef DRM_PLANE_TYPE_PRIMARY
# define DRM_PLANE_TYPE_PRIMARY 1
# define DRM_PLANE_TYPE_CURSOR 2
#endif
+#define pread_field(_fd, _reg, _ptr, _fld) \
+ (sizeof(_ptr->_fld) != \
+ pread(_fd, &(_ptr->_fld), sizeof(_ptr->_fld), \
+ _reg->offset + offsetof(typeof(*_ptr), _fld)))
+
+#define pwrite_field(_fd, _reg, _ptr, _fld) \
+ (sizeof(_ptr->_fld) != \
+ pwrite(_fd, &(_ptr->_fld), sizeof(_ptr->_fld), \
+ _reg->offset + offsetof(typeof(*_ptr), _fld)))
+
+
+static void vfio_display_edid_update(VFIOPCIDevice *vdev, bool enabled,
+ int prefx, int prefy)
+{
+ VFIODisplay *dpy = vdev->dpy;
+ int fd = vdev->vbasedev.fd;
+ qemu_edid_info edid = {
+ .maxx = dpy->edid_regs->max_xres,
+ .maxy = dpy->edid_regs->max_yres,
+ .prefx = prefx,
+ .prefy = prefy,
+ };
+
+ dpy->edid_regs->link_state = VFIO_DEVICE_GFX_LINK_STATE_DOWN;
+ if (pwrite_field(fd, dpy->edid_info, dpy->edid_regs, link_state)) {
+ goto err;
+ }
+ trace_vfio_display_edid_link_down();
+
+ if (!enabled) {
+ return;
+ }
+
+ if (edid.maxx && edid.prefx > edid.maxx) {
+ edid.prefx = edid.maxx;
+ }
+ if (edid.maxy && edid.prefy > edid.maxy) {
+ edid.prefy = edid.maxy;
+ }
+ qemu_edid_generate(dpy->edid_blob,
+ dpy->edid_regs->edid_max_size,
+ &edid);
+ trace_vfio_display_edid_update(edid.prefx, edid.prefy);
+
+ dpy->edid_regs->edid_size = qemu_edid_size(dpy->edid_blob);
+ if (pwrite_field(fd, dpy->edid_info, dpy->edid_regs, edid_size)) {
+ goto err;
+ }
+ if (pwrite(fd, dpy->edid_blob, dpy->edid_regs->edid_size,
+ dpy->edid_info->offset + dpy->edid_regs->edid_offset)
+ != dpy->edid_regs->edid_size) {
+ goto err;
+ }
+
+ dpy->edid_regs->link_state = VFIO_DEVICE_GFX_LINK_STATE_UP;
+ if (pwrite_field(fd, dpy->edid_info, dpy->edid_regs, link_state)) {
+ goto err;
+ }
+ trace_vfio_display_edid_link_up();
+ return;
+
+err:
+ trace_vfio_display_edid_write_error();
+ return;
+}
+
+static int vfio_display_edid_ui_info(void *opaque, uint32_t idx,
+ QemuUIInfo *info)
+{
+ VFIOPCIDevice *vdev = opaque;
+ VFIODisplay *dpy = vdev->dpy;
+
+ if (!dpy->edid_regs) {
+ return 0;
+ }
+
+ if (info->width && info->height) {
+ vfio_display_edid_update(vdev, true, info->width, info->height);
+ } else {
+ vfio_display_edid_update(vdev, false, 0, 0);
+ }
+
+ return 0;
+}
+
+static void vfio_display_edid_init(VFIOPCIDevice *vdev)
+{
+ VFIODisplay *dpy = vdev->dpy;
+ int fd = vdev->vbasedev.fd;
+ int ret;
+
+ ret = vfio_get_dev_region_info(&vdev->vbasedev,
+ VFIO_REGION_TYPE_GFX,
+ VFIO_REGION_SUBTYPE_GFX_EDID,
+ &dpy->edid_info);
+ if (ret) {
+ return;
+ }
+
+ trace_vfio_display_edid_available();
+ dpy->edid_regs = g_new0(struct vfio_region_gfx_edid, 1);
+ if (pread_field(fd, dpy->edid_info, dpy->edid_regs, edid_offset)) {
+ goto err;
+ }
+ if (pread_field(fd, dpy->edid_info, dpy->edid_regs, edid_max_size)) {
+ goto err;
+ }
+ if (pread_field(fd, dpy->edid_info, dpy->edid_regs, max_xres)) {
+ goto err;
+ }
+ if (pread_field(fd, dpy->edid_info, dpy->edid_regs, max_yres)) {
+ goto err;
+ }
+
+ dpy->edid_blob = g_malloc0(dpy->edid_regs->edid_max_size);
+
+ vfio_display_edid_update(vdev, true, 0, 0);
+ return;
+
+err:
+ trace_vfio_display_edid_write_error();
+ g_free(dpy->edid_regs);
+ dpy->edid_regs = NULL;
+ return;
+}
+
+static void vfio_display_edid_exit(VFIODisplay *dpy)
+{
+ if (!dpy->edid_regs) {
+ return;
+ }
+
+ g_free(dpy->edid_regs);
+ g_free(dpy->edid_blob);
+}
+
static void vfio_display_update_cursor(VFIODMABuf *dmabuf,
struct vfio_device_gfx_plane_info *plane)
{
@@ -171,6 +309,7 @@ static void vfio_display_dmabuf_update(void *opaque)
static const GraphicHwOps vfio_display_dmabuf_ops = {
.gfx_update = vfio_display_dmabuf_update,
+ .ui_info = vfio_display_edid_ui_info,
};
static int vfio_display_dmabuf_init(VFIOPCIDevice *vdev, Error **errp)
@@ -187,6 +326,7 @@ static int vfio_display_dmabuf_init(VFIOPCIDevice *vdev, Error **errp)
if (vdev->enable_ramfb) {
vdev->dpy->ramfb = ramfb_setup(errp);
}
+ vfio_display_edid_init(vdev);
return 0;
}
@@ -366,5 +506,6 @@ void vfio_display_finalize(VFIOPCIDevice *vdev)
graphic_console_close(vdev->dpy->con);
vfio_display_dmabuf_exit(vdev->dpy);
vfio_display_region_exit(vdev->dpy);
+ vfio_display_edid_exit(vdev->dpy);
g_free(vdev->dpy);
}