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Message-ID: <3cc891d9-f136-2381-cc8e-016a2ad9a967@amd.com>
Date: Fri, 18 Nov 2022 13:54:39 -0600
From: "Limonciello, Mario" <mario.limonciello@....com>
To: Lyude Paul <lyude@...hat.com>, amd-gfx@...ts.freedesktop.org
Cc: Wenjing Liu <Wenjing.Liu@....com>,
"open list:DRM DRIVERS" <dri-devel@...ts.freedesktop.org>,
open list <linux-kernel@...r.kernel.org>,
Hamza Mahfooz <hamza.mahfooz@....com>,
David Airlie <airlied@...il.com>,
David Francis <David.Francis@....com>,
Rodrigo Siqueira <Rodrigo.Siqueira@....com>,
Alex Hung <alex.hung@....com>, Fangzhi Zuo <Jerry.Zuo@....com>,
Aurabindo Pillai <aurabindo.pillai@....com>,
Harry Wentland <harry.wentland@....com>,
Daniel Vetter <daniel@...ll.ch>, Leo Li <sunpeng.li@....com>,
hersen wu <hersenxs.wu@....com>,
Mikita Lipski <mikita.lipski@....com>,
"Pan, Xinhui" <Xinhui.Pan@....com>, Roman Li <roman.li@....com>,
stable@...r.kernel.org,
Christian König <christian.koenig@....com>,
Thomas Zimmermann <tzimmermann@...e.de>,
Wayne Lin <Wayne.Lin@....com>,
Alex Deucher <alexander.deucher@....com>,
Nicholas Kazlauskas <nicholas.kazlauskas@....com>
Subject: Re: [v3] drm/amdgpu/mst: Stop ignoring error codes and deadlocking
On 11/18/2022 13:25, Lyude Paul wrote:
> It appears that amdgpu makes the mistake of completely ignoring the return
> values from the DP MST helpers, and instead just returns a simple
> true/false. In this case, it seems to have come back to bite us because as
> a result of simply returning false from
> compute_mst_dsc_configs_for_state(), amdgpu had no way of telling when a
> deadlock happened from these helpers. This could definitely result in some
> kernel splats.
>
> V2:
> * Address Wayne's comments (fix another bunch of spots where we weren't
> passing down return codes)
> V3:
> * Fix uninitialized var in pre_compute_mst_dsc_configs_for_state()
FYI v2 was just merged recently, it's in the 6.2 pull request that was
sent out and Alex planned to add it to 6.1-fixes next week too.
Can you send just the delta from v2->v3 as another patch so it can layer
in cleanly?
>
> Signed-off-by: Lyude Paul <lyude@...hat.com>
> Fixes: 8c20a1ed9b4f ("drm/amd/display: MST DSC compute fair share")
> Reviewed-by: Wayne Lin <Wayne.Lin@....com>
> Cc: Harry Wentland <harry.wentland@....com>
> Cc: <stable@...r.kernel.org> # v5.6+
> ---
> .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 18 +-
> .../display/amdgpu_dm/amdgpu_dm_mst_types.c | 235 ++++++++++--------
> .../display/amdgpu_dm/amdgpu_dm_mst_types.h | 12 +-
> 3 files changed, 147 insertions(+), 118 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> index 0db2a88cd4d7..852a2100c6b3 100644
> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> @@ -6462,7 +6462,7 @@ static int dm_update_mst_vcpi_slots_for_dsc(struct drm_atomic_state *state,
> struct drm_connector_state *new_con_state;
> struct amdgpu_dm_connector *aconnector;
> struct dm_connector_state *dm_conn_state;
> - int i, j;
> + int i, j, ret;
> int vcpi, pbn_div, pbn, slot_num = 0;
>
> for_each_new_connector_in_state(state, connector, new_con_state, i) {
> @@ -6509,8 +6509,11 @@ static int dm_update_mst_vcpi_slots_for_dsc(struct drm_atomic_state *state,
> dm_conn_state->pbn = pbn;
> dm_conn_state->vcpi_slots = slot_num;
>
> - drm_dp_mst_atomic_enable_dsc(state, aconnector->port, dm_conn_state->pbn,
> - false);
> + ret = drm_dp_mst_atomic_enable_dsc(state, aconnector->port,
> + dm_conn_state->pbn, false);
> + if (ret < 0)
> + return ret;
> +
> continue;
> }
>
> @@ -9523,10 +9526,9 @@ static int amdgpu_dm_atomic_check(struct drm_device *dev,
>
> #if defined(CONFIG_DRM_AMD_DC_DCN)
> if (dc_resource_is_dsc_encoding_supported(dc)) {
> - if (!pre_validate_dsc(state, &dm_state, vars)) {
> - ret = -EINVAL;
> + ret = pre_validate_dsc(state, &dm_state, vars);
> + if (ret != 0)
> goto fail;
> - }
> }
> #endif
>
> @@ -9621,9 +9623,9 @@ static int amdgpu_dm_atomic_check(struct drm_device *dev,
> }
>
> #if defined(CONFIG_DRM_AMD_DC_DCN)
> - if (!compute_mst_dsc_configs_for_state(state, dm_state->context, vars)) {
> + ret = compute_mst_dsc_configs_for_state(state, dm_state->context, vars);
> + if (ret) {
> DRM_DEBUG_DRIVER("compute_mst_dsc_configs_for_state() failed\n");
> - ret = -EINVAL;
> goto fail;
> }
>
> diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
> index 6ff96b4bdda5..2f72745660fb 100644
> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
> @@ -703,13 +703,13 @@ static int bpp_x16_from_pbn(struct dsc_mst_fairness_params param, int pbn)
> return dsc_config.bits_per_pixel;
> }
>
> -static bool increase_dsc_bpp(struct drm_atomic_state *state,
> - struct drm_dp_mst_topology_state *mst_state,
> - struct dc_link *dc_link,
> - struct dsc_mst_fairness_params *params,
> - struct dsc_mst_fairness_vars *vars,
> - int count,
> - int k)
> +static int increase_dsc_bpp(struct drm_atomic_state *state,
> + struct drm_dp_mst_topology_state *mst_state,
> + struct dc_link *dc_link,
> + struct dsc_mst_fairness_params *params,
> + struct dsc_mst_fairness_vars *vars,
> + int count,
> + int k)
> {
> int i;
> bool bpp_increased[MAX_PIPES];
> @@ -719,6 +719,7 @@ static bool increase_dsc_bpp(struct drm_atomic_state *state,
> int remaining_to_increase = 0;
> int link_timeslots_used;
> int fair_pbn_alloc;
> + int ret = 0;
>
> for (i = 0; i < count; i++) {
> if (vars[i + k].dsc_enabled) {
> @@ -757,52 +758,60 @@ static bool increase_dsc_bpp(struct drm_atomic_state *state,
>
> if (initial_slack[next_index] > fair_pbn_alloc) {
> vars[next_index].pbn += fair_pbn_alloc;
> - if (drm_dp_atomic_find_time_slots(state,
> - params[next_index].port->mgr,
> - params[next_index].port,
> - vars[next_index].pbn) < 0)
> - return false;
> - if (!drm_dp_mst_atomic_check(state)) {
> + ret = drm_dp_atomic_find_time_slots(state,
> + params[next_index].port->mgr,
> + params[next_index].port,
> + vars[next_index].pbn);
> + if (ret < 0)
> + return ret;
> +
> + ret = drm_dp_mst_atomic_check(state);
> + if (ret == 0) {
> vars[next_index].bpp_x16 = bpp_x16_from_pbn(params[next_index], vars[next_index].pbn);
> } else {
> vars[next_index].pbn -= fair_pbn_alloc;
> - if (drm_dp_atomic_find_time_slots(state,
> - params[next_index].port->mgr,
> - params[next_index].port,
> - vars[next_index].pbn) < 0)
> - return false;
> + ret = drm_dp_atomic_find_time_slots(state,
> + params[next_index].port->mgr,
> + params[next_index].port,
> + vars[next_index].pbn);
> + if (ret < 0)
> + return ret;
> }
> } else {
> vars[next_index].pbn += initial_slack[next_index];
> - if (drm_dp_atomic_find_time_slots(state,
> - params[next_index].port->mgr,
> - params[next_index].port,
> - vars[next_index].pbn) < 0)
> - return false;
> - if (!drm_dp_mst_atomic_check(state)) {
> + ret = drm_dp_atomic_find_time_slots(state,
> + params[next_index].port->mgr,
> + params[next_index].port,
> + vars[next_index].pbn);
> + if (ret < 0)
> + return ret;
> +
> + ret = drm_dp_mst_atomic_check(state);
> + if (ret == 0) {
> vars[next_index].bpp_x16 = params[next_index].bw_range.max_target_bpp_x16;
> } else {
> vars[next_index].pbn -= initial_slack[next_index];
> - if (drm_dp_atomic_find_time_slots(state,
> - params[next_index].port->mgr,
> - params[next_index].port,
> - vars[next_index].pbn) < 0)
> - return false;
> + ret = drm_dp_atomic_find_time_slots(state,
> + params[next_index].port->mgr,
> + params[next_index].port,
> + vars[next_index].pbn);
> + if (ret < 0)
> + return ret;
> }
> }
>
> bpp_increased[next_index] = true;
> remaining_to_increase--;
> }
> - return true;
> + return 0;
> }
>
> -static bool try_disable_dsc(struct drm_atomic_state *state,
> - struct dc_link *dc_link,
> - struct dsc_mst_fairness_params *params,
> - struct dsc_mst_fairness_vars *vars,
> - int count,
> - int k)
> +static int try_disable_dsc(struct drm_atomic_state *state,
> + struct dc_link *dc_link,
> + struct dsc_mst_fairness_params *params,
> + struct dsc_mst_fairness_vars *vars,
> + int count,
> + int k)
> {
> int i;
> bool tried[MAX_PIPES];
> @@ -810,6 +819,7 @@ static bool try_disable_dsc(struct drm_atomic_state *state,
> int max_kbps_increase;
> int next_index;
> int remaining_to_try = 0;
> + int ret;
>
> for (i = 0; i < count; i++) {
> if (vars[i + k].dsc_enabled
> @@ -840,49 +850,52 @@ static bool try_disable_dsc(struct drm_atomic_state *state,
> break;
>
> vars[next_index].pbn = kbps_to_peak_pbn(params[next_index].bw_range.stream_kbps);
> - if (drm_dp_atomic_find_time_slots(state,
> - params[next_index].port->mgr,
> - params[next_index].port,
> - vars[next_index].pbn) < 0)
> - return false;
> + ret = drm_dp_atomic_find_time_slots(state,
> + params[next_index].port->mgr,
> + params[next_index].port,
> + vars[next_index].pbn);
> + if (ret < 0)
> + return ret;
>
> - if (!drm_dp_mst_atomic_check(state)) {
> + ret = drm_dp_mst_atomic_check(state);
> + if (ret == 0) {
> vars[next_index].dsc_enabled = false;
> vars[next_index].bpp_x16 = 0;
> } else {
> vars[next_index].pbn = kbps_to_peak_pbn(params[next_index].bw_range.max_kbps);
> - if (drm_dp_atomic_find_time_slots(state,
> - params[next_index].port->mgr,
> - params[next_index].port,
> - vars[next_index].pbn) < 0)
> - return false;
> + ret = drm_dp_atomic_find_time_slots(state,
> + params[next_index].port->mgr,
> + params[next_index].port,
> + vars[next_index].pbn);
> + if (ret < 0)
> + return ret;
> }
>
> tried[next_index] = true;
> remaining_to_try--;
> }
> - return true;
> + return 0;
> }
>
> -static bool compute_mst_dsc_configs_for_link(struct drm_atomic_state *state,
> - struct dc_state *dc_state,
> - struct dc_link *dc_link,
> - struct dsc_mst_fairness_vars *vars,
> - struct drm_dp_mst_topology_mgr *mgr,
> - int *link_vars_start_index)
> +static int compute_mst_dsc_configs_for_link(struct drm_atomic_state *state,
> + struct dc_state *dc_state,
> + struct dc_link *dc_link,
> + struct dsc_mst_fairness_vars *vars,
> + struct drm_dp_mst_topology_mgr *mgr,
> + int *link_vars_start_index)
> {
> struct dc_stream_state *stream;
> struct dsc_mst_fairness_params params[MAX_PIPES];
> struct amdgpu_dm_connector *aconnector;
> struct drm_dp_mst_topology_state *mst_state = drm_atomic_get_mst_topology_state(state, mgr);
> int count = 0;
> - int i, k;
> + int i, k, ret;
> bool debugfs_overwrite = false;
>
> memset(params, 0, sizeof(params));
>
> if (IS_ERR(mst_state))
> - return false;
> + return PTR_ERR(mst_state);
>
> mst_state->pbn_div = dm_mst_get_pbn_divider(dc_link);
> #if defined(CONFIG_DRM_AMD_DC_DCN)
> @@ -933,7 +946,7 @@ static bool compute_mst_dsc_configs_for_link(struct drm_atomic_state *state,
>
> if (count == 0) {
> ASSERT(0);
> - return true;
> + return 0;
> }
>
> /* k is start index of vars for current phy link used by mst hub */
> @@ -947,13 +960,17 @@ static bool compute_mst_dsc_configs_for_link(struct drm_atomic_state *state,
> vars[i + k].pbn = kbps_to_peak_pbn(params[i].bw_range.stream_kbps);
> vars[i + k].dsc_enabled = false;
> vars[i + k].bpp_x16 = 0;
> - if (drm_dp_atomic_find_time_slots(state, params[i].port->mgr, params[i].port,
> - vars[i + k].pbn) < 0)
> - return false;
> + ret = drm_dp_atomic_find_time_slots(state, params[i].port->mgr, params[i].port,
> + vars[i + k].pbn);
> + if (ret < 0)
> + return ret;
> }
> - if (!drm_dp_mst_atomic_check(state) && !debugfs_overwrite) {
> + ret = drm_dp_mst_atomic_check(state);
> + if (ret == 0 && !debugfs_overwrite) {
> set_dsc_configs_from_fairness_vars(params, vars, count, k);
> - return true;
> + return 0;
> + } else if (ret != -ENOSPC) {
> + return ret;
> }
>
> /* Try max compression */
> @@ -962,31 +979,36 @@ static bool compute_mst_dsc_configs_for_link(struct drm_atomic_state *state,
> vars[i + k].pbn = kbps_to_peak_pbn(params[i].bw_range.min_kbps);
> vars[i + k].dsc_enabled = true;
> vars[i + k].bpp_x16 = params[i].bw_range.min_target_bpp_x16;
> - if (drm_dp_atomic_find_time_slots(state, params[i].port->mgr,
> - params[i].port, vars[i + k].pbn) < 0)
> - return false;
> + ret = drm_dp_atomic_find_time_slots(state, params[i].port->mgr,
> + params[i].port, vars[i + k].pbn);
> + if (ret < 0)
> + return ret;
> } else {
> vars[i + k].pbn = kbps_to_peak_pbn(params[i].bw_range.stream_kbps);
> vars[i + k].dsc_enabled = false;
> vars[i + k].bpp_x16 = 0;
> - if (drm_dp_atomic_find_time_slots(state, params[i].port->mgr,
> - params[i].port, vars[i + k].pbn) < 0)
> - return false;
> + ret = drm_dp_atomic_find_time_slots(state, params[i].port->mgr,
> + params[i].port, vars[i + k].pbn);
> + if (ret < 0)
> + return ret;
> }
> }
> - if (drm_dp_mst_atomic_check(state))
> - return false;
> + ret = drm_dp_mst_atomic_check(state);
> + if (ret != 0)
> + return ret;
>
> /* Optimize degree of compression */
> - if (!increase_dsc_bpp(state, mst_state, dc_link, params, vars, count, k))
> - return false;
> + ret = increase_dsc_bpp(state, mst_state, dc_link, params, vars, count, k);
> + if (ret < 0)
> + return ret;
>
> - if (!try_disable_dsc(state, dc_link, params, vars, count, k))
> - return false;
> + ret = try_disable_dsc(state, dc_link, params, vars, count, k);
> + if (ret < 0)
> + return ret;
>
> set_dsc_configs_from_fairness_vars(params, vars, count, k);
>
> - return true;
> + return 0;
> }
>
> static bool is_dsc_need_re_compute(
> @@ -1087,15 +1109,16 @@ static bool is_dsc_need_re_compute(
> return is_dsc_need_re_compute;
> }
>
> -bool compute_mst_dsc_configs_for_state(struct drm_atomic_state *state,
> - struct dc_state *dc_state,
> - struct dsc_mst_fairness_vars *vars)
> +int compute_mst_dsc_configs_for_state(struct drm_atomic_state *state,
> + struct dc_state *dc_state,
> + struct dsc_mst_fairness_vars *vars)
> {
> int i, j;
> struct dc_stream_state *stream;
> bool computed_streams[MAX_PIPES];
> struct amdgpu_dm_connector *aconnector;
> int link_vars_start_index = 0;
> + int ret = 0;
>
> for (i = 0; i < dc_state->stream_count; i++)
> computed_streams[i] = false;
> @@ -1118,17 +1141,19 @@ bool compute_mst_dsc_configs_for_state(struct drm_atomic_state *state,
> continue;
>
> if (dcn20_remove_stream_from_ctx(stream->ctx->dc, dc_state, stream) != DC_OK)
> - return false;
> + return -EINVAL;
>
> if (!is_dsc_need_re_compute(state, dc_state, stream->link))
> continue;
>
> mutex_lock(&aconnector->mst_mgr.lock);
> - if (!compute_mst_dsc_configs_for_link(state, dc_state, stream->link, vars,
> - &aconnector->mst_mgr,
> - &link_vars_start_index)) {
> +
> + ret = compute_mst_dsc_configs_for_link(state, dc_state, stream->link, vars,
> + &aconnector->mst_mgr,
> + &link_vars_start_index);
> + if (ret != 0) {
> mutex_unlock(&aconnector->mst_mgr.lock);
> - return false;
> + return ret;
> }
> mutex_unlock(&aconnector->mst_mgr.lock);
>
> @@ -1143,22 +1168,22 @@ bool compute_mst_dsc_configs_for_state(struct drm_atomic_state *state,
>
> if (stream->timing.flags.DSC == 1)
> if (dc_stream_add_dsc_to_resource(stream->ctx->dc, dc_state, stream) != DC_OK)
> - return false;
> + return -EINVAL;
> }
>
> - return true;
> + return ret;
> }
>
> -static bool
> - pre_compute_mst_dsc_configs_for_state(struct drm_atomic_state *state,
> - struct dc_state *dc_state,
> - struct dsc_mst_fairness_vars *vars)
> +static int pre_compute_mst_dsc_configs_for_state(struct drm_atomic_state *state,
> + struct dc_state *dc_state,
> + struct dsc_mst_fairness_vars *vars)
> {
> int i, j;
> struct dc_stream_state *stream;
> bool computed_streams[MAX_PIPES];
> struct amdgpu_dm_connector *aconnector;
> int link_vars_start_index = 0;
> + int ret = 0;
>
> for (i = 0; i < dc_state->stream_count; i++)
> computed_streams[i] = false;
> @@ -1184,11 +1209,12 @@ static bool
> continue;
>
> mutex_lock(&aconnector->mst_mgr.lock);
> - if (!compute_mst_dsc_configs_for_link(state, dc_state, stream->link, vars,
> - &aconnector->mst_mgr,
> - &link_vars_start_index)) {
> + ret = compute_mst_dsc_configs_for_link(state, dc_state, stream->link, vars,
> + &aconnector->mst_mgr,
> + &link_vars_start_index);
> + if (ret != 0) {
> mutex_unlock(&aconnector->mst_mgr.lock);
> - return false;
> + return ret;
> }
> mutex_unlock(&aconnector->mst_mgr.lock);
>
> @@ -1198,7 +1224,7 @@ static bool
> }
> }
>
> - return true;
> + return ret;
> }
>
> static int find_crtc_index_in_state_by_stream(struct drm_atomic_state *state,
> @@ -1253,9 +1279,9 @@ static bool is_dsc_precompute_needed(struct drm_atomic_state *state)
> return ret;
> }
>
> -bool pre_validate_dsc(struct drm_atomic_state *state,
> - struct dm_atomic_state **dm_state_ptr,
> - struct dsc_mst_fairness_vars *vars)
> +int pre_validate_dsc(struct drm_atomic_state *state,
> + struct dm_atomic_state **dm_state_ptr,
> + struct dsc_mst_fairness_vars *vars)
> {
> int i;
> struct dm_atomic_state *dm_state;
> @@ -1264,11 +1290,12 @@ bool pre_validate_dsc(struct drm_atomic_state *state,
>
> if (!is_dsc_precompute_needed(state)) {
> DRM_INFO_ONCE("DSC precompute is not needed.\n");
> - return true;
> + return 0;
> }
> - if (dm_atomic_get_state(state, dm_state_ptr)) {
> + ret = dm_atomic_get_state(state, dm_state_ptr);
> + if (ret != 0) {
> DRM_INFO_ONCE("dm_atomic_get_state() failed\n");
> - return false;
> + return ret;
> }
> dm_state = *dm_state_ptr;
>
> @@ -1280,7 +1307,7 @@ bool pre_validate_dsc(struct drm_atomic_state *state,
>
> local_dc_state = kmemdup(dm_state->context, sizeof(struct dc_state), GFP_KERNEL);
> if (!local_dc_state)
> - return false;
> + return -ENOMEM;
>
> for (i = 0; i < local_dc_state->stream_count; i++) {
> struct dc_stream_state *stream = dm_state->context->streams[i];
> @@ -1316,9 +1343,9 @@ bool pre_validate_dsc(struct drm_atomic_state *state,
> if (ret != 0)
> goto clean_exit;
>
> - if (!pre_compute_mst_dsc_configs_for_state(state, local_dc_state, vars)) {
> + ret = pre_compute_mst_dsc_configs_for_state(state, local_dc_state, vars);
> + if (ret != 0) {
> DRM_INFO_ONCE("pre_compute_mst_dsc_configs_for_state() failed\n");
> - ret = -EINVAL;
> goto clean_exit;
> }
>
> @@ -1349,7 +1376,7 @@ bool pre_validate_dsc(struct drm_atomic_state *state,
>
> kfree(local_dc_state);
>
> - return (ret == 0);
> + return ret;
> }
>
> static unsigned int kbps_from_pbn(unsigned int pbn)
> diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.h b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.h
> index b92a7c5671aa..97fd70df531b 100644
> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.h
> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.h
> @@ -53,15 +53,15 @@ struct dsc_mst_fairness_vars {
> struct amdgpu_dm_connector *aconnector;
> };
>
> -bool compute_mst_dsc_configs_for_state(struct drm_atomic_state *state,
> - struct dc_state *dc_state,
> - struct dsc_mst_fairness_vars *vars);
> +int compute_mst_dsc_configs_for_state(struct drm_atomic_state *state,
> + struct dc_state *dc_state,
> + struct dsc_mst_fairness_vars *vars);
>
> bool needs_dsc_aux_workaround(struct dc_link *link);
>
> -bool pre_validate_dsc(struct drm_atomic_state *state,
> - struct dm_atomic_state **dm_state_ptr,
> - struct dsc_mst_fairness_vars *vars);
> +int pre_validate_dsc(struct drm_atomic_state *state,
> + struct dm_atomic_state **dm_state_ptr,
> + struct dsc_mst_fairness_vars *vars);
>
> enum dc_status dm_dp_mst_is_port_support_mode(
> struct amdgpu_dm_connector *aconnector,
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