| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-ID: <20250421135702.GJ29483@pendragon.ideasonboard.com>
Date: Mon, 21 Apr 2025 16:57:02 +0300
From: Laurent Pinchart <laurent.pinchart@...asonboard.com>
To: Rishikesh Donadkar <r-donadkar@...com>
Cc: jai.luthra@...ux.dev, mripard@...nel.org, linux-kernel@...r.kernel.org,
linux-media@...r.kernel.org, devicetree@...r.kernel.org,
devarsht@...com, y-abhilashchandra@...com, mchehab@...nel.org,
robh@...nel.org, krzk+dt@...nel.org, conor+dt@...nel.org,
vaishnav.a@...com, s-jain1@...com, vigneshr@...com,
sakari.ailus@...ux.intel.com, hverkuil-cisco@...all.nl,
tomi.valkeinen@...asonboard.com, jai.luthra@...asonboard.com,
changhuang.liang@...rfivetech.com, jack.zhu@...rfivetech.com
Subject: Re: [PATCH v3 10/13] media: cadence: csi2rx: Enable multi-stream
support
Hi Rishikesh,
Thank you for the patch.
On Thu, Apr 17, 2025 at 12:25:51PM +0530, Rishikesh Donadkar wrote:
> From: Jai Luthra <j-luthra@...com>
>
> Cadence CSI-2 bridge IP supports capturing multiple virtual "streams"
> of data over the same physical interface using MIPI Virtual Channels.
>
> The V4L2 subdev APIs should reflect this capability and allow per-stream
> routing and controls.
>
> While the hardware IP supports usecases where streams coming in the sink
> pad can be broadcasted to multiple source pads, the driver will need
> significant re-architecture to make that possible. The two users of this
> IP in mainline linux are TI Shim and StarFive JH7110 CAMSS, and both
> have only integrated the first source pad i.e stream0 of this IP. So for
> now keep it simple and only allow 1-to-1 mapping of streams from sink to
> source, without any broadcasting.
>
> With stream routing now supported in the driver, implement the
> enable_stream and disable_stream hooks in place of the stream-unaware
> s_stream hook.
>
> This allows consumer devices like a DMA bridge or ISP, to enable
> particular streams on a source pad, which in turn can be used to enable
> only particular streams on the CSI-TX device connected on the sink pad.
>
> Implement a fallback s_stream hook that internally calls enable_stream
> on each source pad, for consumer drivers that don't use multi-stream
> APIs to still work.
Can't you use v4l2_subdev_s_stream_helper() ? If not, please briefly
explain why in the commit message.
> Signed-off-by: Jai Luthra <j-luthra@...com>
> Co-developed-by: Rishikesh Donadkar <r-donadkar@...com>
> Signed-off-by: Rishikesh Donadkar <r-donadkar@...com>
> ---
> drivers/media/platform/cadence/cdns-csi2rx.c | 378 ++++++++++++++-----
> 1 file changed, 288 insertions(+), 90 deletions(-)
>
> diff --git a/drivers/media/platform/cadence/cdns-csi2rx.c b/drivers/media/platform/cadence/cdns-csi2rx.c
> index df05d278df379..95beb6623de8c 100644
> --- a/drivers/media/platform/cadence/cdns-csi2rx.c
> +++ b/drivers/media/platform/cadence/cdns-csi2rx.c
> @@ -90,6 +90,7 @@ struct csi2rx_priv {
> struct reset_control *pixel_rst[CSI2RX_STREAMS_MAX];
> struct phy *dphy;
>
> + u32 vc_select[CSI2RX_STREAMS_MAX];
> u8 lanes[CSI2RX_LANES_MAX];
> u8 num_lanes;
> u8 max_lanes;
> @@ -179,29 +180,36 @@ static void csi2rx_reset(struct csi2rx_priv *csi2rx)
>
> static int csi2rx_configure_ext_dphy(struct csi2rx_priv *csi2rx)
> {
> - struct media_pad *src_pad =
> - &csi2rx->source_subdev->entity.pads[csi2rx->source_pad];
> + struct v4l2_ctrl_handler *handler = csi2rx->source_subdev->ctrl_handler;
> union phy_configure_opts opts = { };
> struct phy_configure_opts_mipi_dphy *cfg = &opts.mipi_dphy;
> - struct v4l2_subdev_format sd_fmt = {
> - .which = V4L2_SUBDEV_FORMAT_ACTIVE,
> - .pad = CSI2RX_PAD_SINK,
> - };
> + struct v4l2_mbus_framefmt *framefmt;
> + struct v4l2_subdev_state *state;
> const struct csi2rx_fmt *fmt;
> s64 link_freq;
> int ret;
>
> - ret = v4l2_subdev_call_state_active(&csi2rx->subdev, pad, get_fmt,
> - &sd_fmt);
> - if (ret < 0)
> - return ret;
> -
> - fmt = csi2rx_get_fmt_by_code(sd_fmt.format.code);
> + if (v4l2_ctrl_find(handler, V4L2_CID_LINK_FREQ)) {
> + link_freq = v4l2_get_link_freq(handler, 0, 0);
> + } else {
> + state = v4l2_subdev_get_locked_active_state(&csi2rx->subdev);
> + framefmt = v4l2_subdev_state_get_format(state, CSI2RX_PAD_SINK,
> + 0);
> + fmt = csi2rx_get_fmt_by_code(framefmt->code);
> +
> + link_freq = v4l2_get_link_freq(handler, fmt->bpp,
> + 2 * csi2rx->num_lanes);
> +
> + dev_warn(csi2rx->dev,
> + "Guessing link frequency using bitdepth of stream 0.\n");
> + dev_warn(csi2rx->dev,
> + "V4L2_CID_LINK_FREQ control is required for multi format sources.\n");
> + }
Why do you need this complexity, instead of calling the
v4l2_get_link_freq() variant that takes the source pad as its first
argument ?
>
> - link_freq = v4l2_get_link_freq(src_pad,
> - fmt->bpp, 2 * csi2rx->num_lanes);
> - if (link_freq < 0)
> + if (link_freq < 0) {
> + dev_err(csi2rx->dev, "Unable to calculate link frequency\n");
> return link_freq;
> + }
>
> ret = phy_mipi_dphy_get_default_config_for_hsclk(link_freq,
> csi2rx->num_lanes, cfg);
> @@ -224,18 +232,10 @@ static int csi2rx_configure_ext_dphy(struct csi2rx_priv *csi2rx)
> static int csi2rx_start(struct csi2rx_priv *csi2rx)
> {
> unsigned int i;
> - struct media_pad *remote_pad;
> unsigned long lanes_used = 0;
> u32 reg;
> int ret;
>
> - remote_pad = media_pad_remote_pad_first(&csi2rx->pads[CSI2RX_PAD_SINK]);
> - if (!remote_pad) {
> - dev_err(csi2rx->dev,
> - "Failed to find connected source\n");
> - return -ENODEV;
> - }
> -
> ret = clk_prepare_enable(csi2rx->p_clk);
> if (ret)
> return ret;
> @@ -302,11 +302,7 @@ static int csi2rx_start(struct csi2rx_priv *csi2rx)
> writel(CSI2RX_STREAM_CFG_FIFO_MODE_LARGE_BUF,
> csi2rx->base + CSI2RX_STREAM_CFG_REG(i));
>
> - /*
> - * Enable one virtual channel. When multiple virtual channels
> - * are supported this will have to be changed.
> - */
> - writel(CSI2RX_STREAM_DATA_CFG_VC_SELECT(0),
> + writel(csi2rx->vc_select[i],
> csi2rx->base + CSI2RX_STREAM_DATA_CFG_REG(i));
>
> writel(CSI2RX_STREAM_CTRL_START,
> @@ -319,17 +315,10 @@ static int csi2rx_start(struct csi2rx_priv *csi2rx)
>
> reset_control_deassert(csi2rx->sys_rst);
>
> - ret = v4l2_subdev_enable_streams(csi2rx->source_subdev,
> - remote_pad->index, BIT(0));
> - if (ret)
> - goto err_disable_sysclk;
> -
> clk_disable_unprepare(csi2rx->p_clk);
>
> return 0;
>
> -err_disable_sysclk:
> - clk_disable_unprepare(csi2rx->sys_clk);
> err_disable_pixclk:
> for (; i > 0; i--) {
> reset_control_assert(csi2rx->pixel_rst[i - 1]);
> @@ -348,7 +337,6 @@ static int csi2rx_start(struct csi2rx_priv *csi2rx)
>
> static void csi2rx_stop(struct csi2rx_priv *csi2rx)
> {
> - struct media_pad *remote_pad;
> unsigned int i;
> u32 val;
> int ret;
> @@ -377,13 +365,6 @@ static void csi2rx_stop(struct csi2rx_priv *csi2rx)
> reset_control_assert(csi2rx->p_rst);
> clk_disable_unprepare(csi2rx->p_clk);
>
> - remote_pad = media_pad_remote_pad_first(&csi2rx->pads[CSI2RX_PAD_SINK]);
> - if (!remote_pad ||
> - v4l2_subdev_disable_streams(csi2rx->source_subdev,
> - remote_pad->index, BIT(0))) {
> - dev_warn(csi2rx->dev, "Couldn't disable our subdev\n");
> - }
> -
> if (csi2rx->dphy) {
> writel(0, csi2rx->base + CSI2RX_DPHY_LANE_CTRL_REG);
>
> @@ -392,37 +373,153 @@ static void csi2rx_stop(struct csi2rx_priv *csi2rx)
> }
> }
>
> -static int csi2rx_s_stream(struct v4l2_subdev *subdev, int enable)
> +static void csi2rx_update_vc_select(struct csi2rx_priv *csi2rx,
> + struct v4l2_subdev_state *state)
> +{
> + struct v4l2_mbus_frame_desc fd = {0};
> + struct v4l2_subdev_route *route;
> + unsigned int i;
> + int ret;
> +
> + /* Capture VC=0 by default */
> + for (i = 0; i < CSI2RX_STREAMS_MAX; i++)
> + csi2rx->vc_select[i] = CSI2RX_STREAM_DATA_CFG_VC_SELECT(0);
> +
> + ret = csi2rx_get_frame_desc_from_source(csi2rx, &fd);
> + if (ret || fd.type != V4L2_MBUS_FRAME_DESC_TYPE_CSI2) {
> + dev_dbg(csi2rx->dev,
> + "Failed to get source frame desc, allowing only VC=0\n");
> + return;
> + }
> +
> + /* If source provides per-stream VC info, use it to filter by VC */
> + memset(csi2rx->vc_select, 0, sizeof(csi2rx->vc_select));
> +
> + for_each_active_route(&state->routing, route) {
> + u32 cdns_stream = route->source_pad - CSI2RX_PAD_SOURCE_STREAM0;
> +
> + for (i = 0; i < fd.num_entries; i++) {
> + if (fd.entry[i].stream != route->sink_stream)
> + continue;
> +
> + csi2rx->vc_select[cdns_stream] |=
> + CSI2RX_STREAM_DATA_CFG_VC_SELECT(fd.entry[i].bus.csi2.vc);
> + }
> + }
> +}
> +
> +static int csi2rx_enable_streams(struct v4l2_subdev *subdev,
> + struct v4l2_subdev_state *state, u32 pad,
> + u64 streams_mask)
> {
> struct csi2rx_priv *csi2rx = v4l2_subdev_to_csi2rx(subdev);
> - int ret = 0;
> + struct media_pad *remote_pad;
> + u64 sink_streams;
> + int ret;
> +
> + remote_pad = media_pad_remote_pad_first(&csi2rx->pads[CSI2RX_PAD_SINK]);
> + if (!remote_pad) {
> + dev_err(csi2rx->dev,
> + "Failed to find connected source\n");
> + return -ENODEV;
> + }
> +
> + sink_streams = v4l2_subdev_state_xlate_streams(state, pad,
> + CSI2RX_PAD_SINK,
> + &streams_mask);
>
> mutex_lock(&csi2rx->lock);
Can you use lock guards ? It will simplify error handling.
> + /*
> + * If we're not the first users, there's no need to
> + * enable the whole controller.
> + */
> + if (!csi2rx->count) {
I would have stored the bitmask of enabled streams instead of a count,
but it doesn't matter that much.
> + ret = csi2rx_start(csi2rx);
> + if (ret)
> + goto err_stream_start;
> + }
>
> - if (enable) {
> - /*
> - * If we're not the first users, there's no need to
> - * enable the whole controller.
> - */
> - if (!csi2rx->count) {
> - ret = csi2rx_start(csi2rx);
> - if (ret)
> - goto out;
> - }
> + /* Start streaming on the source */
> + ret = v4l2_subdev_enable_streams(csi2rx->source_subdev, remote_pad->index,
> + sink_streams);
> + if (ret) {
> + dev_err(csi2rx->dev,
> + "Failed to start streams %#llx on subdev\n",
> + sink_streams);
> + goto err_subdev_enable;
> + }
>
> - csi2rx->count++;
> - } else {
> - csi2rx->count--;
> + csi2rx->count++;
> + mutex_unlock(&csi2rx->lock);
> +
> + return 0;
> +
> +err_subdev_enable:
> + if (!csi2rx->count)
> + csi2rx_stop(csi2rx);
> +err_stream_start:
> + mutex_unlock(&csi2rx->lock);
> + return ret;
> +}
> +
> +static int csi2rx_disable_streams(struct v4l2_subdev *subdev,
> + struct v4l2_subdev_state *state, u32 pad,
> + u64 streams_mask)
> +{
> + struct csi2rx_priv *csi2rx = v4l2_subdev_to_csi2rx(subdev);
> + struct media_pad *remote_pad;
> + u64 sink_streams;
> +
> + sink_streams = v4l2_subdev_state_xlate_streams(state, pad,
> + CSI2RX_PAD_SINK,
> + &streams_mask);
>
> - /*
> - * Let the last user turn off the lights.
> - */
> - if (!csi2rx->count)
> - csi2rx_stop(csi2rx);
> + remote_pad = media_pad_remote_pad_first(&csi2rx->pads[CSI2RX_PAD_SINK]);
> + if (!remote_pad ||
> + v4l2_subdev_disable_streams(csi2rx->source_subdev,
> + remote_pad->index, sink_streams)) {
> + dev_err(csi2rx->dev, "Couldn't disable our subdev\n");
> }
>
> -out:
> + mutex_lock(&csi2rx->lock);
> + csi2rx->count--;
> + /*
> + * Let the last user turn off the lights.
> + */
This can become a single line.
> + if (!csi2rx->count)
> + csi2rx_stop(csi2rx);
> mutex_unlock(&csi2rx->lock);
> +
> + return 0;
> +}
> +
> +static int csi2rx_s_stream_fallback(struct v4l2_subdev *sd, int enable)
> +{
> + struct v4l2_subdev_state *state;
> + struct v4l2_subdev_route *route;
> + u64 mask[CSI2RX_PAD_MAX] = {0};
> + int i, ret;
> +
> + /* Find the stream mask on all source pads */
> + state = v4l2_subdev_lock_and_get_active_state(sd);
> + for (i = CSI2RX_PAD_SOURCE_STREAM0; i < CSI2RX_PAD_MAX; i++) {
> + for_each_active_route(&state->routing, route) {
> + if (route->source_pad == i)
> + mask[i] |= BIT_ULL(route->source_stream);
> + }
> + }
> + v4l2_subdev_unlock_state(state);
> +
> + /* Start streaming on each pad */
> + for (i = CSI2RX_PAD_SOURCE_STREAM0; i < CSI2RX_PAD_MAX; i++) {
> + if (enable)
> + ret = v4l2_subdev_enable_streams(sd, i, mask[i]);
> + else
> + ret = v4l2_subdev_disable_streams(sd, i, mask[i]);
> + if (ret)
> + return ret;
> + }
> +
> return ret;
> }
>
> @@ -438,12 +535,58 @@ static int csi2rx_enum_mbus_code(struct v4l2_subdev *subdev,
> return 0;
> }
>
> +static int _csi2rx_set_routing(struct v4l2_subdev *subdev,
> + struct v4l2_subdev_state *state,
> + struct v4l2_subdev_krouting *routing)
> +{
> + static const struct v4l2_mbus_framefmt format = {
> + .width = 640,
> + .height = 480,
> + .code = MEDIA_BUS_FMT_UYVY8_1X16,
> + .field = V4L2_FIELD_NONE,
> + .colorspace = V4L2_COLORSPACE_SRGB,
> + .ycbcr_enc = V4L2_YCBCR_ENC_601,
> + .quantization = V4L2_QUANTIZATION_LIM_RANGE,
> + .xfer_func = V4L2_XFER_FUNC_SRGB,
> + };
> + int ret;
> +
> + if (routing->num_routes > V4L2_FRAME_DESC_ENTRY_MAX)
> + return -EINVAL;
> +
> + ret = v4l2_subdev_routing_validate(subdev, routing,
> + V4L2_SUBDEV_ROUTING_ONLY_1_TO_1);
> + if (ret)
> + return ret;
> +
> + return v4l2_subdev_set_routing_with_fmt(subdev, state, routing, &format);
> +}
> +
> +static int csi2rx_set_routing(struct v4l2_subdev *subdev,
> + struct v4l2_subdev_state *state,
> + enum v4l2_subdev_format_whence which,
> + struct v4l2_subdev_krouting *routing)
> +{
> + struct csi2rx_priv *csi2rx = v4l2_subdev_to_csi2rx(subdev);
> + int ret;
> +
> + if (which == V4L2_SUBDEV_FORMAT_ACTIVE && csi2rx->count)
> + return -EBUSY;
> +
> + ret = _csi2rx_set_routing(subdev, state, routing);
> + if (ret)
> + return ret;
> +
> + csi2rx_update_vc_select(csi2rx, state);
When setting routing on the TRY state this will update the active state,
which isn't correct. Can you call this function when starting the device
instead ?
> +
> + return 0;
> +}
> +
> static int csi2rx_set_fmt(struct v4l2_subdev *subdev,
> struct v4l2_subdev_state *state,
> struct v4l2_subdev_format *format)
> {
> struct v4l2_mbus_framefmt *fmt;
> - unsigned int i;
>
> /* No transcoding, source and sink formats must match. */
> if (format->pad != CSI2RX_PAD_SINK)
> @@ -455,14 +598,16 @@ static int csi2rx_set_fmt(struct v4l2_subdev *subdev,
> format->format.field = V4L2_FIELD_NONE;
>
> /* Set sink format */
> - fmt = v4l2_subdev_state_get_format(state, format->pad);
> + fmt = v4l2_subdev_state_get_format(state, format->pad, format->stream);
> *fmt = format->format;
>
> - /* Propagate to source formats */
> - for (i = CSI2RX_PAD_SOURCE_STREAM0; i < CSI2RX_PAD_MAX; i++) {
> - fmt = v4l2_subdev_state_get_format(state, i);
> - *fmt = format->format;
> - }
> + /* Propagate to source format */
> + fmt = v4l2_subdev_state_get_opposite_stream_format(state, format->pad,
> + format->stream);
> + if (!fmt)
> + return -EINVAL;
> +
> + *fmt = format->format;
>
> return 0;
> }
> @@ -470,40 +615,92 @@ static int csi2rx_set_fmt(struct v4l2_subdev *subdev,
> static int csi2rx_init_state(struct v4l2_subdev *subdev,
> struct v4l2_subdev_state *state)
> {
> - struct v4l2_subdev_format format = {
> - .pad = CSI2RX_PAD_SINK,
> - .format = {
> - .width = 640,
> - .height = 480,
> - .code = MEDIA_BUS_FMT_UYVY8_1X16,
> - .field = V4L2_FIELD_NONE,
> - .colorspace = V4L2_COLORSPACE_SRGB,
> - .ycbcr_enc = V4L2_YCBCR_ENC_601,
> - .quantization = V4L2_QUANTIZATION_LIM_RANGE,
> - .xfer_func = V4L2_XFER_FUNC_SRGB,
> + struct v4l2_subdev_route routes[] = {
> + {
> + .sink_pad = CSI2RX_PAD_SINK,
> + .sink_stream = 0,
> + .source_pad = CSI2RX_PAD_SOURCE_STREAM0,
> + .source_stream = 0,
> + .flags = V4L2_SUBDEV_ROUTE_FL_ACTIVE,
> },
> };
>
> - return csi2rx_set_fmt(subdev, state, &format);
> + struct v4l2_subdev_krouting routing = {
> + .num_routes = ARRAY_SIZE(routes),
> + .routes = routes,
> + };
> +
> + return _csi2rx_set_routing(subdev, state, &routing);
> }
>
> static int csi2rx_get_frame_desc(struct v4l2_subdev *subdev, unsigned int pad,
> struct v4l2_mbus_frame_desc *fd)
> {
> struct csi2rx_priv *csi2rx = v4l2_subdev_to_csi2rx(subdev);
> + struct v4l2_mbus_frame_desc source_fd = {0};
> + struct v4l2_subdev_route *route;
> + struct v4l2_subdev_state *state;
> + int ret;
>
> - return csi2rx_get_frame_desc_from_source(csi2rx, fd);
> + ret = csi2rx_get_frame_desc_from_source(csi2rx, &source_fd);
> + if (ret)
> + return ret;
> +
> + fd->type = V4L2_MBUS_FRAME_DESC_TYPE_CSI2;
> +
> + state = v4l2_subdev_lock_and_get_active_state(subdev);
> +
> + for_each_active_route(&state->routing, route) {
> + struct v4l2_mbus_frame_desc_entry *source_entry = NULL;
> + unsigned int i;
> +
> + if (route->source_pad != pad)
> + continue;
> +
> + for (i = 0; i < source_fd.num_entries; i++) {
> + if (source_fd.entry[i].stream == route->sink_stream) {
> + source_entry = &source_fd.entry[i];
> + break;
> + }
> + }
> +
> + if (!source_entry) {
> + dev_err(csi2rx->dev,
> + "Failed to find stream from source frame desc\n");
> + ret = -EPIPE;
> + goto err_missing_stream;
> + }
> +
> + fd->entry[fd->num_entries].stream = route->source_stream;
> + fd->entry[fd->num_entries].flags = source_entry->flags;
> + fd->entry[fd->num_entries].length = source_entry->length;
> + fd->entry[fd->num_entries].pixelcode = source_entry->pixelcode;
> + fd->entry[fd->num_entries].bus.csi2.vc =
> + source_entry->bus.csi2.vc;
> + fd->entry[fd->num_entries].bus.csi2.dt =
> + source_entry->bus.csi2.dt;
> +
> + fd->num_entries++;
> + }
> +
> +err_missing_stream:
> + v4l2_subdev_unlock_state(state);
> +
> + return ret;
> }
>
> static const struct v4l2_subdev_pad_ops csi2rx_pad_ops = {
> - .enum_mbus_code = csi2rx_enum_mbus_code,
> - .get_fmt = v4l2_subdev_get_fmt,
> - .set_fmt = csi2rx_set_fmt,
> - .get_frame_desc = csi2rx_get_frame_desc,
> + .enum_mbus_code = csi2rx_enum_mbus_code,
> + .get_fmt = v4l2_subdev_get_fmt,
> + .set_fmt = csi2rx_set_fmt,
> + .get_frame_desc = csi2rx_get_frame_desc,
> + .set_routing = csi2rx_set_routing,
> + .enable_streams = csi2rx_enable_streams,
> + .disable_streams = csi2rx_disable_streams,
> };
>
> static const struct v4l2_subdev_video_ops csi2rx_video_ops = {
> - .s_stream = csi2rx_s_stream,
> + .s_stream = csi2rx_s_stream_fallback,
> };
>
> static const struct v4l2_subdev_ops csi2rx_subdev_ops = {
> @@ -735,7 +932,8 @@ static int csi2rx_probe(struct platform_device *pdev)
> csi2rx->pads[CSI2RX_PAD_SINK].flags = MEDIA_PAD_FL_SINK;
> for (i = CSI2RX_PAD_SOURCE_STREAM0; i < CSI2RX_PAD_MAX; i++)
> csi2rx->pads[i].flags = MEDIA_PAD_FL_SOURCE;
> - csi2rx->subdev.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
> + csi2rx->subdev.flags = V4L2_SUBDEV_FL_HAS_DEVNODE |
> + V4L2_SUBDEV_FL_STREAMS;
> csi2rx->subdev.entity.ops = &csi2rx_media_ops;
>
> ret = media_entity_pads_init(&csi2rx->subdev.entity, CSI2RX_PAD_MAX,
--
Regards,
Laurent Pinchart
Powered by blists - more mailing lists