Re: [PATCH v3] xenfb: remove xen_init_display "temporary" hack

[Paul Durrant <Paul.Durrant@citrix.com>]

> -----Original Message-----
> From: Stefano Stabellini [mailto:sstabellini@kernel.org]
> Sent: 07 July 2017 00:48
> To: xen-devel@lists.xenproject.org; qemu-devel@nongnu.org
> Cc: sstabellini@kernel.org; peter.maydell@linaro.org; Anthony Perard
> <anthony.perard@citrix.com>; kraxel@redhat.com; Paul Durrant
> <Paul.Durrant@citrix.com>; Owen Smith <owen.smith@citrix.com>
> Subject: [PATCH v3] xenfb: remove xen_init_display "temporary" hack
> 
> Initialize xenfb properly, as all other backends, from its own
> "initialise" function.
> 
> Remove the dependency of vkbd on vfb: use
> qemu_console_lookup_by_index
> to find the principal console (to get the size of the screen) instead of
> relying on a vfb backend to be available (which adds a dependency
> between the two).
> 
> Signed-off-by: Stefano Stabellini <sstabellini@kernel.org>
> 
> ---
> Note that this patch conflicts with Owen's series
> (http://secure-web.cisco.com/1jP-
> CKLunauJRBQedgDNfgct9mtg_pNYLJWNBDT-
> zM4mg5Am27ioYBmyUMxhbMGM-97-
> en9LEKERq7K7PwzK4kZBJPu8kasnucJpwQLHGLR1ZwG8yq6QbP-
> RZeThfWp42NwZdDfCV4gMKbZJgmcMEA9Vh4i3YlDjFbj8UtWwVNBCFiVYwpL
> iMtPnfwwfoPhs0Ejm-ylu-jvLn6qqqxntDe1wQ8OXB2Q-
> PvqCLVV55pmM3cgmnYKy2curl0CpByIQe0JtMcKS8aReLRVAFPGLMMw/http
> %3A%2F%2Fmarc.info%2F%3Fl%3Dqemu-
> devel%26m%3D149908803419893%26w%3D2). However it
> should be very easy to rebase one on top of the other.
> 
> Changes in v3:
> - use qemu_console_lookup_by_index to find the console from
>   xenfb_mouse_event
> - remove con from struct common and add it to struct XenFB
> - remove in->c.con check from input_initialise

Thanks. All looks good now :-)

Reviewed-by: Paul Durrant <paul.durrant@citrix.com>

> 
> Changes in v2:
> - remove xen_init_display from xen_backend.h
> - handle cases where vkbd is missing
> 
> diff --git a/hw/display/xenfb.c b/hw/display/xenfb.c
> index e76c0d8..df8b78f 100644
> --- a/hw/display/xenfb.c
> +++ b/hw/display/xenfb.c
> @@ -46,7 +46,6 @@
>  struct common {
>      struct XenDevice  xendev;  /* must be first */
>      void              *page;
> -    QemuConsole       *con;
>  };
> 
>  struct XenInput {
> @@ -61,6 +60,7 @@ struct XenInput {
> 
>  struct XenFB {
>      struct common     c;
> +    QemuConsole       *con;
>      size_t            fb_len;
>      int               row_stride;
>      int               depth;
> @@ -71,7 +71,6 @@ struct XenFB {
>      int               fbpages;
>      int               feature_update;
>      int               bug_trigger;
> -    int               have_console;
>      int               do_resize;
> 
>      struct {
> @@ -80,6 +79,7 @@ struct XenFB {
>      int               up_count;
>      int               up_fullscreen;
>  };
> +static const GraphicHwOps xenfb_ops;
> 
>  /* -------------------------------------------------------------------- */
> 
> @@ -306,10 +306,18 @@ static void xenfb_mouse_event(void *opaque,
>  			      int dx, int dy, int dz, int button_state)
>  {
>      struct XenInput *xenfb = opaque;
> -    DisplaySurface *surface = qemu_console_surface(xenfb->c.con);
> -    int dw = surface_width(surface);
> -    int dh = surface_height(surface);
> -    int i;
> +    QemuConsole *con = qemu_console_lookup_by_index(0);
> +    DisplaySurface *surface;
> +    int dw, dh, i;
> +
> +    if (!con) {
> +        xen_pv_printf(&xenfb->c.xendev, 0, "No QEMU console available");
> +        return;
> +    }
> +
> +    surface = qemu_console_surface(con);
> +    dw = surface_width(surface);
> +    dh = surface_height(surface);
> 
>      trace_xenfb_mouse_event(opaque, dx, dy, dz, button_state,
>                              xenfb->abs_pointer_wanted);
> @@ -344,11 +352,6 @@ static int input_initialise(struct XenDevice *xendev)
>      struct XenInput *in = container_of(xendev, struct XenInput, c.xendev);
>      int rc;
> 
> -    if (!in->c.con) {
> -        xen_pv_printf(xendev, 1, "ds not set (yet)\n");
> -        return -1;
> -    }
> -
>      rc = common_bind(&in->c);
>      if (rc != 0)
>  	return rc;
> @@ -608,7 +611,7 @@ static int xenfb_configure_fb(struct XenFB *xenfb,
> size_t fb_len_lim,
>   */
>  static void xenfb_guest_copy(struct XenFB *xenfb, int x, int y, int w, int h)
>  {
> -    DisplaySurface *surface = qemu_console_surface(xenfb->c.con);
> +    DisplaySurface *surface = qemu_console_surface(xenfb->con);
>      int line, oops = 0;
>      int bpp = surface_bits_per_pixel(surface);
>      int linesize = surface_stride(surface);
> @@ -642,7 +645,7 @@ static void xenfb_guest_copy(struct XenFB *xenfb,
> int x, int y, int w, int h)
>          xen_pv_printf(&xenfb->c.xendev, 0, "%s: oops: convert %d -> %d
> bpp?\n",
>                        __FUNCTION__, xenfb->depth, bpp);
> 
> -    dpy_gfx_update(xenfb->c.con, x, y, w, h);
> +    dpy_gfx_update(xenfb->con, x, y, w, h);
>  }
> 
>  #ifdef XENFB_TYPE_REFRESH_PERIOD
> @@ -728,7 +731,7 @@ static void xenfb_update(void *opaque)
>              surface = qemu_create_displaysurface(xenfb->width, xenfb->height);
>              break;
>          }
> -        dpy_gfx_replace_surface(xenfb->c.con, surface);
> +        dpy_gfx_replace_surface(xenfb->con, surface);
>          xen_pv_printf(&xenfb->c.xendev, 1,
>                        "update: resizing: %dx%d @ %d bpp%s\n",
>                        xenfb->width, xenfb->height, xenfb->depth,
> @@ -877,16 +880,7 @@ static int fb_initialise(struct XenDevice *xendev)
>      if (rc != 0)
>  	return rc;
> 
> -#if 0  /* handled in xen_init_display() for now */
> -    if (!fb->have_console) {
> -        fb->c.ds = graphic_console_init(xenfb_update,
> -                                        xenfb_invalidate,
> -                                        NULL,
> -                                        NULL,
> -                                        fb);
> -        fb->have_console = 1;
> -    }
> -#endif
> +    fb->con = graphic_console_init(NULL, 0, &xenfb_ops, fb);
> 
>      if (xenstore_read_fe_int(xendev, "feature-update", &fb-
> >feature_update) == -1)
>  	fb->feature_update = 0;
> @@ -972,42 +966,3 @@ static const GraphicHwOps xenfb_ops = {
>      .gfx_update  = xenfb_update,
>      .update_interval = xenfb_update_interval,
>  };
> -
> -/*
> - * FIXME/TODO: Kill this.
> - * Temporary needed while DisplayState reorganization is in flight.
> - */
> -void xen_init_display(int domid)
> -{
> -    struct XenDevice *xfb, *xin;
> -    struct XenFB *fb;
> -    struct XenInput *in;
> -    int i = 0;
> -
> -wait_more:
> -    i++;
> -    main_loop_wait(true);
> -    xfb = xen_pv_find_xendev("vfb", domid, 0);
> -    xin = xen_pv_find_xendev("vkbd", domid, 0);
> -    if (!xfb || !xin) {
> -        if (i < 256) {
> -            usleep(10000);
> -            goto wait_more;
> -        }
> -        xen_pv_printf(NULL, 1, "displaystate setup failed\n");
> -        return;
> -    }
> -
> -    /* vfb */
> -    fb = container_of(xfb, struct XenFB, c.xendev);
> -    fb->c.con = graphic_console_init(NULL, 0, &xenfb_ops, fb);
> -    fb->have_console = 1;
> -
> -    /* vkbd */
> -    in = container_of(xin, struct XenInput, c.xendev);
> -    in->c.con = fb->c.con;
> -
> -    /* retry ->init() */
> -    xen_be_check_state(xin);
> -    xen_be_check_state(xfb);
> -}
> diff --git a/hw/xenpv/xen_machine_pv.c b/hw/xenpv/xen_machine_pv.c
> index 79aef4e..31d2f25 100644
> --- a/hw/xenpv/xen_machine_pv.c
> +++ b/hw/xenpv/xen_machine_pv.c
> @@ -94,9 +94,6 @@ static void xen_init_pv(MachineState *machine)
> 
>      /* config cleanup hook */
>      atexit(xen_config_cleanup);
> -
> -    /* setup framebuffer */
> -    xen_init_display(xen_domid);
>  }
> 
>  static void xenpv_machine_init(MachineClass *mc)
> diff --git a/include/hw/xen/xen_backend.h
> b/include/hw/xen/xen_backend.h
> index 852c2ea..8a6fbcb 100644
> --- a/include/hw/xen/xen_backend.h
> +++ b/include/hw/xen/xen_backend.h
> @@ -55,8 +55,6 @@ extern struct XenDevOps xen_netdev_ops;       /*
> xen_nic.c         */
>  extern struct XenDevOps xen_usb_ops;          /* xen-usb.c         */
>  #endif
> 
> -void xen_init_display(int domid);
> -
>  /* configuration (aka xenbus setup) */
>  void xen_config_cleanup(void);
>  int xen_config_dev_blk(DriveInfo *disk);


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