Re: [PATCH v3 16/18] hw/sm501: allow compiling without PIXMAN

["Marc-André Lureau" <marcandre.lureau@redhat.com>]

Hi

On Tue, Oct 10, 2023 at 3:59 PM BALATON Zoltan <balaton@eik.bme.hu> wrote:
>
> On Tue, 10 Oct 2023, marcandre.lureau@redhat.com wrote:
> > From: Marc-André Lureau <marcandre.lureau@redhat.com>
> >
> > Drop the "x-pixman" property and use fallback path in such case.
> >
> > Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
> > ---
> > hw/display/sm501.c | 46 +++++++++++++++++++++++++++++++++++++---------
> > 1 file changed, 37 insertions(+), 9 deletions(-)
> >
> > diff --git a/hw/display/sm501.c b/hw/display/sm501.c
> > index 0eecd00701..bc5faa19f0 100644
> > --- a/hw/display/sm501.c
> > +++ b/hw/display/sm501.c
> > @@ -438,6 +438,12 @@
> > #define SM501_HWC_WIDTH                 64
> > #define SM501_HWC_HEIGHT                64
> >
> > +#ifdef CONFIG_PIXMAN
> > +#define DEFAULT_X_PIXMAN 7
> > +#else
> > +#define DEFAULT_X_PIXMAN 0
> > +#endif
> > +
> > /* SM501 local memory size taken from "linux/drivers/mfd/sm501.c" */
> > static const uint32_t sm501_mem_local_size[] = {
> >     [0] = 4 * MiB,
> > @@ -730,7 +736,6 @@ static void sm501_2d_operation(SM501State *s)
> >     switch (cmd) {
> >     case 0: /* BitBlt */
> >     {
> > -        static uint32_t tmp_buf[16384];
> >         unsigned int src_x = (s->twoD_source >> 16) & 0x01FFF;
> >         unsigned int src_y = s->twoD_source & 0xFFFF;
> >         uint32_t src_base = s->twoD_source_base & 0x03FFFFFF;
> > @@ -828,9 +833,11 @@ static void sm501_2d_operation(SM501State *s)
> >                 de = db + (width + (height - 1) * dst_pitch) * bypp;
> >                 overlap = (db < se && sb < de);
> >             }
> > +#ifdef CONFIG_PIXMAN
> >             if (overlap && (s->use_pixman & BIT(2))) {
> >                 /* pixman can't do reverse blit: copy via temporary */
> >                 int tmp_stride = DIV_ROUND_UP(width * bypp, sizeof(uint32_t));
> > +                static uint32_t tmp_buf[16384];
> >                 uint32_t *tmp = tmp_buf;
> >
> >                 if (tmp_stride * sizeof(uint32_t) * height > sizeof(tmp_buf)) {
> > @@ -860,9 +867,12 @@ static void sm501_2d_operation(SM501State *s)
> >                                        dst_pitch * bypp / sizeof(uint32_t),
> >                                        8 * bypp, 8 * bypp, src_x, src_y,
> >                                        dst_x, dst_y, width, height);
> > -            } else {
> > +            } else
> > +#else
> > +            {
> >                 fallback = true;
> >             }
> > +#endif
> >             if (fallback) {
> >                 uint8_t *sp = s->local_mem + src_base;
> >                 uint8_t *d = s->local_mem + dst_base;
> > @@ -894,10 +904,13 @@ static void sm501_2d_operation(SM501State *s)
> >             color = cpu_to_le16(color);
> >         }
> >
> > +#ifdef CONFIG_PIXMAN
> >         if (!(s->use_pixman & BIT(0)) || (width == 1 && height == 1) ||
> >             !pixman_fill((uint32_t *)&s->local_mem[dst_base],
> >                          dst_pitch * bypp / sizeof(uint32_t), 8 * bypp,
> > -                         dst_x, dst_y, width, height, color)) {
> > +                         dst_x, dst_y, width, height, color))
> > +#endif
> > +        {
> >             /* fallback when pixman failed or we don't want to call it */
> >             uint8_t *d = s->local_mem + dst_base;
> >             unsigned int x, y, i;
> > @@ -1875,9 +1888,16 @@ static void sm501_reset(SM501State *s)
> >     s->twoD_wrap = 0;
> > }
> >
> > -static void sm501_init(SM501State *s, DeviceState *dev,
> > -                       uint32_t local_mem_bytes)
> > +static bool sm501_init(SM501State *s, DeviceState *dev,
> > +                       uint32_t local_mem_bytes, Error **errp)
> > {
> > +#ifndef CONFIG_PIXMAN
> > +    if (s->use_pixman != 0) {
> > +        error_setg(errp, "x-pixman!=0, however PIXMAN is not available");
> > +        return false;
> > +    }
> > +#endif
>
> I think this should be just a warning saying that x-pixman != 0 is not
> effective without pixman and not a hard error. The goal is to keep command
> lines working the same not to annoy users unnecesarily.

ok

>
> > +
> >     s->local_mem_size_index = get_local_mem_size_index(local_mem_bytes);
> >
> >     /* local memory */
> > @@ -1916,6 +1936,7 @@ static void sm501_init(SM501State *s, DeviceState *dev,
> >
> >     /* create qemu graphic console */
> >     s->con = graphic_console_init(dev, 0, &sm501_ops, s);
> > +    return true;
> > }
> >
> > static const VMStateDescription vmstate_sm501_state = {
> > @@ -2014,7 +2035,9 @@ static void sm501_realize_sysbus(DeviceState *dev, Error **errp)
> >     SysBusDevice *sbd = SYS_BUS_DEVICE(dev);
> >     MemoryRegion *mr;
> >
> > -    sm501_init(&s->state, dev, s->vram_size);
> > +    if (!sm501_init(&s->state, dev, s->vram_size, errp)) {
> > +        return;
> > +    }
> >     if (get_local_mem_size(&s->state) != s->vram_size) {
> >         error_setg(errp, "Invalid VRAM size, nearest valid size is %" PRIu32,
> >                    get_local_mem_size(&s->state));
> > @@ -2038,7 +2061,8 @@ static void sm501_realize_sysbus(DeviceState *dev, Error **errp)
> >
> > static Property sm501_sysbus_properties[] = {
> >     DEFINE_PROP_UINT32("vram-size", SM501SysBusState, vram_size, 0),
> > -    DEFINE_PROP_UINT8("x-pixman", SM501SysBusState, state.use_pixman, 7),
> > +    /* TODO: consider PROP_BIT instead */
>
> I don't think a comment is needed here but don't mind it you think it
> helps to note this here too but I'd keep the single value instead of
> separate BIT properties.

yes, that will avoid someone else proposing the same change again.

thanks