From 3f9b3f02dda501ea1889d773d547dcff12a3f7bb Mon Sep 17 00:00:00 2001 From: Lyude Paul Date: Mon, 17 Jun 2019 17:59:29 -0400 Subject: drm/dp_mst: Protect drm_dp_mst_port members with locking MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit This is a complicated one. Essentially, there's currently a problem in the MST core that hasn't really caused any issues that we're aware of (emphasis on "that we're aware of"): locking. When we go through and probe the link addresses and path resources in a topology, we hold no locks when updating ports with said information. The members I'm referring to in particular are: - ldps - ddps - mcs - pdt - dpcd_rev - num_sdp_streams - num_sdp_stream_sinks - available_pbn - input - connector Now that we're handling UP requests asynchronously and will be using some of the struct members mentioned above in atomic modesetting in the future for features such as PBN validation, this is going to become a lot more important. As well, the next few commits that prepare us for and introduce suspend/resume reprobing will also need clear locking in order to prevent from additional racing hilarities that we never could have hit in the past. So, let's solve this issue by using &mgr->base.lock, the modesetting lock which currently only protects &mgr->base.state. This works perfectly because it allows us to avoid blocking connection_mutex unnecessarily, and we can grab this in connector detection paths since it's a ww mutex. We start by having drm_dp_mst_handle_up_req() hold this when updating ports. For drm_dp_mst_handle_link_address_port() things are a bit more complicated. As I've learned the hard way, we can grab &mgr->lock.base for everything except for port->connector. See, our normal driver probing paths end up generating this rather obvious lockdep chain: &drm->mode_config.mutex -> crtc_ww_class_mutex/crtc_ww_class_acquire -> &connector->mutex However, sysfs grabs &drm->mode_config.mutex in order to protect itself from connector state changing under it. Because this entails grabbing kn->count, e.g. the lock that the kernel provides for protecting sysfs contexts, we end up grabbing kn->count followed by &drm->mode_config.mutex. This ends up creating an extremely rude chain: &kn->count -> &drm->mode_config.mutex -> crtc_ww_class_mutex/crtc_ww_class_acquire -> &connector->mutex I mean, look at that thing! It's just evil!!! This gross thing ends up making any calls to drm_connector_register()/drm_connector_unregister() impossible when holding any kind of modesetting lock. This is annoying because ideally, we always want to ensure that drm_dp_mst_port->connector never changes when doing an atomic commit or check that would affect the atomic topology state so that it can reliably and easily be used from future DRM DP MST helpers to assist with tasks such as scanning through the current VCPI allocations and adding connectors which need to have their allocations updated in response to a bandwidth change or the like. Being able to hold &mgr->base.lock throughout the entire link probe process would have been _great_, since we could prevent userspace from ever seeing any states in-between individual port changes and as a result likely end up with a much faster probe and more consistent results from said probes. But without some rework of how we handle connector probing in sysfs it's not at all currently possible. In the future, maybe we can try using the sysfs locks to protect updates to connector probing state and fix this mess. So for now, to protect everything other than port->connector under &mgr->base.lock and ensure that we still have the guarantee that atomic check/commit contexts will never see port->connector change we use a silly trick. See: port->connector only needs to change in order to ensure that input ports (see the MST spec) never have a ghost connector associated with them. But, there's nothing stopping us from simply throwing the entire port out and creating a new one in order to maintain that requirement while still keeping port->connector consistent across the lifetime of the port in atomic check/commit contexts. For all intended purposes this works fine, as we validate ports in any contexts we care about before using them and as such will end up reporting the connector as disconnected until it's port's destruction finalizes. So, we just do that in cases where we detect port->input has transitioned from true->false. We don't need to worry about the other direction, since a port without a connector isn't visible to userspace and as such doesn't need to be protected by &mgr->base.lock until we finish registering a connector for it. For updating members of drm_dp_mst_port other than port->connector, we simply grab &mgr->base.lock in drm_dp_mst_link_probe_work() for already registered ports, update said members and drop the lock before potentially registering a connector and probing the link address of it's children. Finally, we modify drm_dp_mst_detect_port() to take a modesetting lock acquisition context in order to acquire &mgr->base.lock under &connection_mutex and convert all it's users over to using the .detect_ctx probe hooks. With that, we finally have well defined locking. Changes since v4: * Get rid of port->mutex, stop using connection_mutex and just use our own modesetting lock - mgr->base.lock. Also, add a probe_lock that comes before this patch. * Just throw out ports that get changed from an output to an input, and replace them with new ports. This lets us ensure that modesetting contexts never see port->connector go from having a connector to being NULL. * Write an extremely detailed explanation of what problems this is trying to fix, since there's a _lot_ of context here and I honestly forgot some of it myself a couple times. * Don't grab mgr->lock when reading port->mstb in drm_dp_mst_handle_link_address_port(). It's not needed. Cc: Juston Li Cc: Imre Deak Cc: Ville Syrjälä Cc: Harry Wentland Cc: Daniel Vetter Reviewed-by: Sean Paul Signed-off-by: Lyude Paul Link: https://patchwork.freedesktop.org/patch/msgid/20191022023641.8026-7-lyude@redhat.com --- .../amd/display/amdgpu_dm/amdgpu_dm_mst_types.c | 28 ++++++++++------------ 1 file changed, 12 insertions(+), 16 deletions(-) (limited to 'drivers/gpu/drm/amd/display') 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 5ec14efd4d8c..f8214acf70b3 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 @@ -123,21 +123,6 @@ static ssize_t dm_dp_aux_transfer(struct drm_dp_aux *aux, return result; } -static enum drm_connector_status -dm_dp_mst_detect(struct drm_connector *connector, bool force) -{ - struct amdgpu_dm_connector *aconnector = to_amdgpu_dm_connector(connector); - struct amdgpu_dm_connector *master = aconnector->mst_port; - - enum drm_connector_status status = - drm_dp_mst_detect_port( - connector, - &master->mst_mgr, - aconnector->port); - - return status; -} - static void dm_dp_mst_connector_destroy(struct drm_connector *connector) { @@ -177,7 +162,6 @@ amdgpu_dm_mst_connector_early_unregister(struct drm_connector *connector) } static const struct drm_connector_funcs dm_dp_mst_connector_funcs = { - .detect = dm_dp_mst_detect, .fill_modes = drm_helper_probe_single_connector_modes, .destroy = dm_dp_mst_connector_destroy, .reset = amdgpu_dm_connector_funcs_reset, @@ -252,10 +236,22 @@ static struct drm_encoder *dm_mst_best_encoder(struct drm_connector *connector) return &amdgpu_dm_connector->mst_encoder->base; } +static int +dm_dp_mst_detect(struct drm_connector *connector, + struct drm_modeset_acquire_ctx *ctx, bool force) +{ + struct amdgpu_dm_connector *aconnector = to_amdgpu_dm_connector(connector); + struct amdgpu_dm_connector *master = aconnector->mst_port; + + return drm_dp_mst_detect_port(connector, ctx, &master->mst_mgr, + aconnector->port); +} + static const struct drm_connector_helper_funcs dm_dp_mst_connector_helper_funcs = { .get_modes = dm_dp_mst_get_modes, .mode_valid = amdgpu_dm_connector_mode_valid, .best_encoder = dm_mst_best_encoder, + .detect_ctx = dm_dp_mst_detect, }; static void amdgpu_dm_encoder_destroy(struct drm_encoder *encoder) -- cgit v1.2.3 From 6857f879f98a276912dbccedfff89e94fbde565c Mon Sep 17 00:00:00 2001 From: Lyude Paul Date: Fri, 12 Jul 2019 19:27:02 -0400 Subject: drm/amdgpu: Iterate through DRM connectors correctly MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Currently, every single piece of code in amdgpu that loops through connectors does it incorrectly and doesn't use the proper list iteration helpers, drm_connector_list_iter_begin() and drm_connector_list_iter_end(). Yeesh. So, do that. Cc: Juston Li Cc: Imre Deak Cc: Ville Syrjälä Cc: Harry Wentland Cc: Daniel Vetter Reviewed-by: Alex Deucher Signed-off-by: Lyude Paul Link: https://patchwork.freedesktop.org/patch/msgid/20191022023641.8026-12-lyude@redhat.com --- drivers/gpu/drm/amd/amdgpu/amdgpu_connectors.c | 13 +++++-- drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 20 +++++++---- drivers/gpu/drm/amd/amdgpu/amdgpu_display.c | 5 ++- drivers/gpu/drm/amd/amdgpu/amdgpu_encoders.c | 40 +++++++++++++++------- drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c | 5 ++- drivers/gpu/drm/amd/amdgpu/dce_v10_0.c | 34 +++++++++++++----- drivers/gpu/drm/amd/amdgpu/dce_v11_0.c | 34 +++++++++++++----- drivers/gpu/drm/amd/amdgpu/dce_v6_0.c | 40 ++++++++++++++++------ drivers/gpu/drm/amd/amdgpu/dce_v8_0.c | 34 +++++++++++++----- drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 33 ++++++++++-------- .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_irq.c | 10 ++++-- 11 files changed, 195 insertions(+), 73 deletions(-) (limited to 'drivers/gpu/drm/amd/display') diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_connectors.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_connectors.c index d8729285f731..a62cbc8199de 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_connectors.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_connectors.c @@ -1019,8 +1019,12 @@ amdgpu_connector_dvi_detect(struct drm_connector *connector, bool force) */ if (amdgpu_connector->shared_ddc && (ret == connector_status_connected)) { struct drm_connector *list_connector; + struct drm_connector_list_iter iter; struct amdgpu_connector *list_amdgpu_connector; - list_for_each_entry(list_connector, &dev->mode_config.connector_list, head) { + + drm_connector_list_iter_begin(dev, &iter); + drm_for_each_connector_iter(list_connector, + &iter) { if (connector == list_connector) continue; list_amdgpu_connector = to_amdgpu_connector(list_connector); @@ -1037,6 +1041,7 @@ amdgpu_connector_dvi_detect(struct drm_connector *connector, bool force) } } } + drm_connector_list_iter_end(&iter); } } } @@ -1494,6 +1499,7 @@ amdgpu_connector_add(struct amdgpu_device *adev, { struct drm_device *dev = adev->ddev; struct drm_connector *connector; + struct drm_connector_list_iter iter; struct amdgpu_connector *amdgpu_connector; struct amdgpu_connector_atom_dig *amdgpu_dig_connector; struct drm_encoder *encoder; @@ -1508,10 +1514,12 @@ amdgpu_connector_add(struct amdgpu_device *adev, return; /* see if we already added it */ - list_for_each_entry(connector, &dev->mode_config.connector_list, head) { + drm_connector_list_iter_begin(dev, &iter); + drm_for_each_connector_iter(connector, &iter) { amdgpu_connector = to_amdgpu_connector(connector); if (amdgpu_connector->connector_id == connector_id) { amdgpu_connector->devices |= supported_device; + drm_connector_list_iter_end(&iter); return; } if (amdgpu_connector->ddc_bus && i2c_bus->valid) { @@ -1526,6 +1534,7 @@ amdgpu_connector_add(struct amdgpu_device *adev, } } } + drm_connector_list_iter_end(&iter); /* check if it's a dp bridge */ list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) { diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c index 5a1939dbd4e3..cff16f554f2e 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c @@ -3007,6 +3007,7 @@ int amdgpu_device_suspend(struct drm_device *dev, bool suspend, bool fbcon) struct amdgpu_device *adev; struct drm_crtc *crtc; struct drm_connector *connector; + struct drm_connector_list_iter iter; int r; if (dev == NULL || dev->dev_private == NULL) { @@ -3029,9 +3030,11 @@ int amdgpu_device_suspend(struct drm_device *dev, bool suspend, bool fbcon) if (!amdgpu_device_has_dc_support(adev)) { /* turn off display hw */ drm_modeset_lock_all(dev); - list_for_each_entry(connector, &dev->mode_config.connector_list, head) { - drm_helper_connector_dpms(connector, DRM_MODE_DPMS_OFF); - } + drm_connector_list_iter_begin(dev, &iter); + drm_for_each_connector_iter(connector, &iter) + drm_helper_connector_dpms(connector, + DRM_MODE_DPMS_OFF); + drm_connector_list_iter_end(&iter); drm_modeset_unlock_all(dev); /* unpin the front buffers and cursors */ list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) { @@ -3110,6 +3113,7 @@ int amdgpu_device_suspend(struct drm_device *dev, bool suspend, bool fbcon) int amdgpu_device_resume(struct drm_device *dev, bool resume, bool fbcon) { struct drm_connector *connector; + struct drm_connector_list_iter iter; struct amdgpu_device *adev = dev->dev_private; struct drm_crtc *crtc; int r = 0; @@ -3180,9 +3184,13 @@ int amdgpu_device_resume(struct drm_device *dev, bool resume, bool fbcon) /* turn on display hw */ drm_modeset_lock_all(dev); - list_for_each_entry(connector, &dev->mode_config.connector_list, head) { - drm_helper_connector_dpms(connector, DRM_MODE_DPMS_ON); - } + + drm_connector_list_iter_begin(dev, &iter); + drm_for_each_connector_iter(connector, &iter) + drm_helper_connector_dpms(connector, + DRM_MODE_DPMS_ON); + drm_connector_list_iter_end(&iter); + drm_modeset_unlock_all(dev); } amdgpu_fbdev_set_suspend(adev, 0); diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c index 1d4aaa9580f4..d2dd59a95e8a 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c @@ -370,11 +370,13 @@ void amdgpu_display_print_display_setup(struct drm_device *dev) struct amdgpu_connector *amdgpu_connector; struct drm_encoder *encoder; struct amdgpu_encoder *amdgpu_encoder; + struct drm_connector_list_iter iter; uint32_t devices; int i = 0; + drm_connector_list_iter_begin(dev, &iter); DRM_INFO("AMDGPU Display Connectors\n"); - list_for_each_entry(connector, &dev->mode_config.connector_list, head) { + drm_for_each_connector_iter(connector, &iter) { amdgpu_connector = to_amdgpu_connector(connector); DRM_INFO("Connector %d:\n", i); DRM_INFO(" %s\n", connector->name); @@ -438,6 +440,7 @@ void amdgpu_display_print_display_setup(struct drm_device *dev) } i++; } + drm_connector_list_iter_end(&iter); } /** diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_encoders.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_encoders.c index 571a6dfb473e..61fcf247a638 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_encoders.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_encoders.c @@ -37,12 +37,14 @@ amdgpu_link_encoder_connector(struct drm_device *dev) { struct amdgpu_device *adev = dev->dev_private; struct drm_connector *connector; + struct drm_connector_list_iter iter; struct amdgpu_connector *amdgpu_connector; struct drm_encoder *encoder; struct amdgpu_encoder *amdgpu_encoder; + drm_connector_list_iter_begin(dev, &iter); /* walk the list and link encoders to connectors */ - list_for_each_entry(connector, &dev->mode_config.connector_list, head) { + drm_for_each_connector_iter(connector, &iter) { amdgpu_connector = to_amdgpu_connector(connector); list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) { amdgpu_encoder = to_amdgpu_encoder(encoder); @@ -55,6 +57,7 @@ amdgpu_link_encoder_connector(struct drm_device *dev) } } } + drm_connector_list_iter_end(&iter); } void amdgpu_encoder_set_active_device(struct drm_encoder *encoder) @@ -62,8 +65,10 @@ void amdgpu_encoder_set_active_device(struct drm_encoder *encoder) struct drm_device *dev = encoder->dev; struct amdgpu_encoder *amdgpu_encoder = to_amdgpu_encoder(encoder); struct drm_connector *connector; + struct drm_connector_list_iter iter; - list_for_each_entry(connector, &dev->mode_config.connector_list, head) { + drm_connector_list_iter_begin(dev, &iter); + drm_for_each_connector_iter(connector, &iter) { if (connector->encoder == encoder) { struct amdgpu_connector *amdgpu_connector = to_amdgpu_connector(connector); amdgpu_encoder->active_device = amdgpu_encoder->devices & amdgpu_connector->devices; @@ -72,6 +77,7 @@ void amdgpu_encoder_set_active_device(struct drm_encoder *encoder) amdgpu_connector->devices, encoder->encoder_type); } } + drm_connector_list_iter_end(&iter); } struct drm_connector * @@ -79,15 +85,20 @@ amdgpu_get_connector_for_encoder(struct drm_encoder *encoder) { struct drm_device *dev = encoder->dev; struct amdgpu_encoder *amdgpu_encoder = to_amdgpu_encoder(encoder); - struct drm_connector *connector; + struct drm_connector *connector, *found = NULL; + struct drm_connector_list_iter iter; struct amdgpu_connector *amdgpu_connector; - list_for_each_entry(connector, &dev->mode_config.connector_list, head) { + drm_connector_list_iter_begin(dev, &iter); + drm_for_each_connector_iter(connector, &iter) { amdgpu_connector = to_amdgpu_connector(connector); - if (amdgpu_encoder->active_device & amdgpu_connector->devices) - return connector; + if (amdgpu_encoder->active_device & amdgpu_connector->devices) { + found = connector; + break; + } } - return NULL; + drm_connector_list_iter_end(&iter); + return found; } struct drm_connector * @@ -95,15 +106,20 @@ amdgpu_get_connector_for_encoder_init(struct drm_encoder *encoder) { struct drm_device *dev = encoder->dev; struct amdgpu_encoder *amdgpu_encoder = to_amdgpu_encoder(encoder); - struct drm_connector *connector; + struct drm_connector *connector, *found = NULL; + struct drm_connector_list_iter iter; struct amdgpu_connector *amdgpu_connector; - list_for_each_entry(connector, &dev->mode_config.connector_list, head) { + drm_connector_list_iter_begin(dev, &iter); + drm_for_each_connector_iter(connector, &iter) { amdgpu_connector = to_amdgpu_connector(connector); - if (amdgpu_encoder->devices & amdgpu_connector->devices) - return connector; + if (amdgpu_encoder->devices & amdgpu_connector->devices) { + found = connector; + break; + } } - return NULL; + drm_connector_list_iter_end(&iter); + return found; } struct drm_encoder *amdgpu_get_external_encoder(struct drm_encoder *encoder) diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c index 2a3f5ec298db..977e121204e6 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c @@ -87,10 +87,13 @@ static void amdgpu_hotplug_work_func(struct work_struct *work) struct drm_device *dev = adev->ddev; struct drm_mode_config *mode_config = &dev->mode_config; struct drm_connector *connector; + struct drm_connector_list_iter iter; mutex_lock(&mode_config->mutex); - list_for_each_entry(connector, &mode_config->connector_list, head) + drm_connector_list_iter_begin(dev, &iter); + drm_for_each_connector_iter(connector, &iter) amdgpu_connector_hotplug(connector); + drm_connector_list_iter_end(&iter); mutex_unlock(&mode_config->mutex); /* Just fire off a uevent and let userspace tell us what to do */ drm_helper_hpd_irq_event(dev); diff --git a/drivers/gpu/drm/amd/amdgpu/dce_v10_0.c b/drivers/gpu/drm/amd/amdgpu/dce_v10_0.c index 645550e7caf5..be82871ac3bd 100644 --- a/drivers/gpu/drm/amd/amdgpu/dce_v10_0.c +++ b/drivers/gpu/drm/amd/amdgpu/dce_v10_0.c @@ -330,9 +330,11 @@ static void dce_v10_0_hpd_init(struct amdgpu_device *adev) { struct drm_device *dev = adev->ddev; struct drm_connector *connector; + struct drm_connector_list_iter iter; u32 tmp; - list_for_each_entry(connector, &dev->mode_config.connector_list, head) { + drm_connector_list_iter_begin(dev, &iter); + drm_for_each_connector_iter(connector, &iter) { struct amdgpu_connector *amdgpu_connector = to_amdgpu_connector(connector); if (amdgpu_connector->hpd.hpd >= adev->mode_info.num_hpd) @@ -368,6 +370,7 @@ static void dce_v10_0_hpd_init(struct amdgpu_device *adev) amdgpu_irq_get(adev, &adev->hpd_irq, amdgpu_connector->hpd.hpd); } + drm_connector_list_iter_end(&iter); } /** @@ -382,9 +385,11 @@ static void dce_v10_0_hpd_fini(struct amdgpu_device *adev) { struct drm_device *dev = adev->ddev; struct drm_connector *connector; + struct drm_connector_list_iter iter; u32 tmp; - list_for_each_entry(connector, &dev->mode_config.connector_list, head) { + drm_connector_list_iter_begin(dev, &iter); + drm_for_each_connector_iter(connector, &iter) { struct amdgpu_connector *amdgpu_connector = to_amdgpu_connector(connector); if (amdgpu_connector->hpd.hpd >= adev->mode_info.num_hpd) @@ -397,6 +402,7 @@ static void dce_v10_0_hpd_fini(struct amdgpu_device *adev) amdgpu_irq_put(adev, &adev->hpd_irq, amdgpu_connector->hpd.hpd); } + drm_connector_list_iter_end(&iter); } static u32 dce_v10_0_hpd_get_gpio_reg(struct amdgpu_device *adev) @@ -1219,10 +1225,12 @@ static void dce_v10_0_afmt_audio_select_pin(struct drm_encoder *encoder) static void dce_v10_0_audio_write_latency_fields(struct drm_encoder *encoder, struct drm_display_mode *mode) { - struct amdgpu_device *adev = encoder->dev->dev_private; + struct drm_device *dev = encoder->dev; + struct amdgpu_device *adev = dev->dev_private; struct amdgpu_encoder *amdgpu_encoder = to_amdgpu_encoder(encoder); struct amdgpu_encoder_atom_dig *dig = amdgpu_encoder->enc_priv; struct drm_connector *connector; + struct drm_connector_list_iter iter; struct amdgpu_connector *amdgpu_connector = NULL; u32 tmp; int interlace = 0; @@ -1230,12 +1238,14 @@ static void dce_v10_0_audio_write_latency_fields(struct drm_encoder *encoder, if (!dig || !dig->afmt || !dig->afmt->pin) return; - list_for_each_entry(connector, &encoder->dev->mode_config.connector_list, head) { + drm_connector_list_iter_begin(dev, &iter); + drm_for_each_connector_iter(connector, &iter) { if (connector->encoder == encoder) { amdgpu_connector = to_amdgpu_connector(connector); break; } } + drm_connector_list_iter_end(&iter); if (!amdgpu_connector) { DRM_ERROR("Couldn't find encoder's connector\n"); @@ -1261,10 +1271,12 @@ static void dce_v10_0_audio_write_latency_fields(struct drm_encoder *encoder, static void dce_v10_0_audio_write_speaker_allocation(struct drm_encoder *encoder) { - struct amdgpu_device *adev = encoder->dev->dev_private; + struct drm_device *dev = encoder->dev; + struct amdgpu_device *adev = dev->dev_private; struct amdgpu_encoder *amdgpu_encoder = to_amdgpu_encoder(encoder); struct amdgpu_encoder_atom_dig *dig = amdgpu_encoder->enc_priv; struct drm_connector *connector; + struct drm_connector_list_iter iter; struct amdgpu_connector *amdgpu_connector = NULL; u32 tmp; u8 *sadb = NULL; @@ -1273,12 +1285,14 @@ static void dce_v10_0_audio_write_speaker_allocation(struct drm_encoder *encoder if (!dig || !dig->afmt || !dig->afmt->pin) return; - list_for_each_entry(connector, &encoder->dev->mode_config.connector_list, head) { + drm_connector_list_iter_begin(dev, &iter); + drm_for_each_connector_iter(connector, &iter) { if (connector->encoder == encoder) { amdgpu_connector = to_amdgpu_connector(connector); break; } } + drm_connector_list_iter_end(&iter); if (!amdgpu_connector) { DRM_ERROR("Couldn't find encoder's connector\n"); @@ -1313,10 +1327,12 @@ static void dce_v10_0_audio_write_speaker_allocation(struct drm_encoder *encoder static void dce_v10_0_audio_write_sad_regs(struct drm_encoder *encoder) { - struct amdgpu_device *adev = encoder->dev->dev_private; + struct drm_device *dev = encoder->dev; + struct amdgpu_device *adev = dev->dev_private; struct amdgpu_encoder *amdgpu_encoder = to_amdgpu_encoder(encoder); struct amdgpu_encoder_atom_dig *dig = amdgpu_encoder->enc_priv; struct drm_connector *connector; + struct drm_connector_list_iter iter; struct amdgpu_connector *amdgpu_connector = NULL; struct cea_sad *sads; int i, sad_count; @@ -1339,12 +1355,14 @@ static void dce_v10_0_audio_write_sad_regs(struct drm_encoder *encoder) if (!dig || !dig->afmt || !dig->afmt->pin) return; - list_for_each_entry(connector, &encoder->dev->mode_config.connector_list, head) { + drm_connector_list_iter_begin(dev, &iter); + drm_for_each_connector_iter(connector, &iter) { if (connector->encoder == encoder) { amdgpu_connector = to_amdgpu_connector(connector); break; } } + drm_connector_list_iter_end(&iter); if (!amdgpu_connector) { DRM_ERROR("Couldn't find encoder's connector\n"); diff --git a/drivers/gpu/drm/amd/amdgpu/dce_v11_0.c b/drivers/gpu/drm/amd/amdgpu/dce_v11_0.c index d9f470632b2c..bde48775cf1b 100644 --- a/drivers/gpu/drm/amd/amdgpu/dce_v11_0.c +++ b/drivers/gpu/drm/amd/amdgpu/dce_v11_0.c @@ -348,9 +348,11 @@ static void dce_v11_0_hpd_init(struct amdgpu_device *adev) { struct drm_device *dev = adev->ddev; struct drm_connector *connector; + struct drm_connector_list_iter iter; u32 tmp; - list_for_each_entry(connector, &dev->mode_config.connector_list, head) { + drm_connector_list_iter_begin(dev, &iter); + drm_for_each_connector_iter(connector, &iter) { struct amdgpu_connector *amdgpu_connector = to_amdgpu_connector(connector); if (amdgpu_connector->hpd.hpd >= adev->mode_info.num_hpd) @@ -385,6 +387,7 @@ static void dce_v11_0_hpd_init(struct amdgpu_device *adev) dce_v11_0_hpd_set_polarity(adev, amdgpu_connector->hpd.hpd); amdgpu_irq_get(adev, &adev->hpd_irq, amdgpu_connector->hpd.hpd); } + drm_connector_list_iter_end(&iter); } /** @@ -399,9 +402,11 @@ static void dce_v11_0_hpd_fini(struct amdgpu_device *adev) { struct drm_device *dev = adev->ddev; struct drm_connector *connector; + struct drm_connector_list_iter iter; u32 tmp; - list_for_each_entry(connector, &dev->mode_config.connector_list, head) { + drm_connector_list_iter_begin(dev, &iter); + drm_for_each_connector_iter(connector, &iter) { struct amdgpu_connector *amdgpu_connector = to_amdgpu_connector(connector); if (amdgpu_connector->hpd.hpd >= adev->mode_info.num_hpd) @@ -413,6 +418,7 @@ static void dce_v11_0_hpd_fini(struct amdgpu_device *adev) amdgpu_irq_put(adev, &adev->hpd_irq, amdgpu_connector->hpd.hpd); } + drm_connector_list_iter_end(&iter); } static u32 dce_v11_0_hpd_get_gpio_reg(struct amdgpu_device *adev) @@ -1245,10 +1251,12 @@ static void dce_v11_0_afmt_audio_select_pin(struct drm_encoder *encoder) static void dce_v11_0_audio_write_latency_fields(struct drm_encoder *encoder, struct drm_display_mode *mode) { - struct amdgpu_device *adev = encoder->dev->dev_private; + struct drm_device *dev = encoder->dev; + struct amdgpu_device *adev = dev->dev_private; struct amdgpu_encoder *amdgpu_encoder = to_amdgpu_encoder(encoder); struct amdgpu_encoder_atom_dig *dig = amdgpu_encoder->enc_priv; struct drm_connector *connector; + struct drm_connector_list_iter iter; struct amdgpu_connector *amdgpu_connector = NULL; u32 tmp; int interlace = 0; @@ -1256,12 +1264,14 @@ static void dce_v11_0_audio_write_latency_fields(struct drm_encoder *encoder, if (!dig || !dig->afmt || !dig->afmt->pin) return; - list_for_each_entry(connector, &encoder->dev->mode_config.connector_list, head) { + drm_connector_list_iter_begin(dev, &iter); + drm_for_each_connector_iter(connector, &iter) { if (connector->encoder == encoder) { amdgpu_connector = to_amdgpu_connector(connector); break; } } + drm_connector_list_iter_end(&iter); if (!amdgpu_connector) { DRM_ERROR("Couldn't find encoder's connector\n"); @@ -1287,10 +1297,12 @@ static void dce_v11_0_audio_write_latency_fields(struct drm_encoder *encoder, static void dce_v11_0_audio_write_speaker_allocation(struct drm_encoder *encoder) { - struct amdgpu_device *adev = encoder->dev->dev_private; + struct drm_device *dev = encoder->dev; + struct amdgpu_device *adev = dev->dev_private; struct amdgpu_encoder *amdgpu_encoder = to_amdgpu_encoder(encoder); struct amdgpu_encoder_atom_dig *dig = amdgpu_encoder->enc_priv; struct drm_connector *connector; + struct drm_connector_list_iter iter; struct amdgpu_connector *amdgpu_connector = NULL; u32 tmp; u8 *sadb = NULL; @@ -1299,12 +1311,14 @@ static void dce_v11_0_audio_write_speaker_allocation(struct drm_encoder *encoder if (!dig || !dig->afmt || !dig->afmt->pin) return; - list_for_each_entry(connector, &encoder->dev->mode_config.connector_list, head) { + drm_connector_list_iter_begin(dev, &iter); + drm_for_each_connector_iter(connector, &iter) { if (connector->encoder == encoder) { amdgpu_connector = to_amdgpu_connector(connector); break; } } + drm_connector_list_iter_end(&iter); if (!amdgpu_connector) { DRM_ERROR("Couldn't find encoder's connector\n"); @@ -1339,10 +1353,12 @@ static void dce_v11_0_audio_write_speaker_allocation(struct drm_encoder *encoder static void dce_v11_0_audio_write_sad_regs(struct drm_encoder *encoder) { - struct amdgpu_device *adev = encoder->dev->dev_private; + struct drm_device *dev = encoder->dev; + struct amdgpu_device *adev = dev->dev_private; struct amdgpu_encoder *amdgpu_encoder = to_amdgpu_encoder(encoder); struct amdgpu_encoder_atom_dig *dig = amdgpu_encoder->enc_priv; struct drm_connector *connector; + struct drm_connector_list_iter iter; struct amdgpu_connector *amdgpu_connector = NULL; struct cea_sad *sads; int i, sad_count; @@ -1365,12 +1381,14 @@ static void dce_v11_0_audio_write_sad_regs(struct drm_encoder *encoder) if (!dig || !dig->afmt || !dig->afmt->pin) return; - list_for_each_entry(connector, &encoder->dev->mode_config.connector_list, head) { + drm_connector_list_iter_begin(dev, &iter); + drm_for_each_connector_iter(connector, &iter) { if (connector->encoder == encoder) { amdgpu_connector = to_amdgpu_connector(connector); break; } } + drm_connector_list_iter_end(&iter); if (!amdgpu_connector) { DRM_ERROR("Couldn't find encoder's connector\n"); diff --git a/drivers/gpu/drm/amd/amdgpu/dce_v6_0.c b/drivers/gpu/drm/amd/amdgpu/dce_v6_0.c index 3eb2e7429269..65f61de931d7 100644 --- a/drivers/gpu/drm/amd/amdgpu/dce_v6_0.c +++ b/drivers/gpu/drm/amd/amdgpu/dce_v6_0.c @@ -281,9 +281,11 @@ static void dce_v6_0_hpd_init(struct amdgpu_device *adev) { struct drm_device *dev = adev->ddev; struct drm_connector *connector; + struct drm_connector_list_iter iter; u32 tmp; - list_for_each_entry(connector, &dev->mode_config.connector_list, head) { + drm_connector_list_iter_begin(dev, &iter); + drm_for_each_connector_iter(connector, &iter) { struct amdgpu_connector *amdgpu_connector = to_amdgpu_connector(connector); if (amdgpu_connector->hpd.hpd >= adev->mode_info.num_hpd) @@ -309,7 +311,7 @@ static void dce_v6_0_hpd_init(struct amdgpu_device *adev) dce_v6_0_hpd_set_polarity(adev, amdgpu_connector->hpd.hpd); amdgpu_irq_get(adev, &adev->hpd_irq, amdgpu_connector->hpd.hpd); } - + drm_connector_list_iter_end(&iter); } /** @@ -324,9 +326,11 @@ static void dce_v6_0_hpd_fini(struct amdgpu_device *adev) { struct drm_device *dev = adev->ddev; struct drm_connector *connector; + struct drm_connector_list_iter iter; u32 tmp; - list_for_each_entry(connector, &dev->mode_config.connector_list, head) { + drm_connector_list_iter_begin(dev, &iter); + drm_for_each_connector_iter(connector, &iter) { struct amdgpu_connector *amdgpu_connector = to_amdgpu_connector(connector); if (amdgpu_connector->hpd.hpd >= adev->mode_info.num_hpd) @@ -338,6 +342,7 @@ static void dce_v6_0_hpd_fini(struct amdgpu_device *adev) amdgpu_irq_put(adev, &adev->hpd_irq, amdgpu_connector->hpd.hpd); } + drm_connector_list_iter_end(&iter); } static u32 dce_v6_0_hpd_get_gpio_reg(struct amdgpu_device *adev) @@ -1124,20 +1129,24 @@ static void dce_v6_0_audio_select_pin(struct drm_encoder *encoder) static void dce_v6_0_audio_write_latency_fields(struct drm_encoder *encoder, struct drm_display_mode *mode) { - struct amdgpu_device *adev = encoder->dev->dev_private; + struct drm_device *dev = encoder->dev; + struct amdgpu_device *adev = dev->dev_private; struct amdgpu_encoder *amdgpu_encoder = to_amdgpu_encoder(encoder); struct amdgpu_encoder_atom_dig *dig = amdgpu_encoder->enc_priv; struct drm_connector *connector; + struct drm_connector_list_iter iter; struct amdgpu_connector *amdgpu_connector = NULL; int interlace = 0; u32 tmp; - list_for_each_entry(connector, &encoder->dev->mode_config.connector_list, head) { + drm_connector_list_iter_begin(dev, &iter); + drm_for_each_connector_iter(connector, &iter) { if (connector->encoder == encoder) { amdgpu_connector = to_amdgpu_connector(connector); break; } } + drm_connector_list_iter_end(&iter); if (!amdgpu_connector) { DRM_ERROR("Couldn't find encoder's connector\n"); @@ -1164,21 +1173,25 @@ static void dce_v6_0_audio_write_latency_fields(struct drm_encoder *encoder, static void dce_v6_0_audio_write_speaker_allocation(struct drm_encoder *encoder) { - struct amdgpu_device *adev = encoder->dev->dev_private; + struct drm_device *dev = encoder->dev; + struct amdgpu_device *adev = dev->dev_private; struct amdgpu_encoder *amdgpu_encoder = to_amdgpu_encoder(encoder); struct amdgpu_encoder_atom_dig *dig = amdgpu_encoder->enc_priv; struct drm_connector *connector; + struct drm_connector_list_iter iter; struct amdgpu_connector *amdgpu_connector = NULL; u8 *sadb = NULL; int sad_count; u32 tmp; - list_for_each_entry(connector, &encoder->dev->mode_config.connector_list, head) { + drm_connector_list_iter_begin(dev, &iter); + drm_for_each_connector_iter(connector, &iter) { if (connector->encoder == encoder) { amdgpu_connector = to_amdgpu_connector(connector); break; } } + drm_connector_list_iter_end(&iter); if (!amdgpu_connector) { DRM_ERROR("Couldn't find encoder's connector\n"); @@ -1221,10 +1234,12 @@ static void dce_v6_0_audio_write_speaker_allocation(struct drm_encoder *encoder) static void dce_v6_0_audio_write_sad_regs(struct drm_encoder *encoder) { - struct amdgpu_device *adev = encoder->dev->dev_private; + struct drm_device *dev = encoder->dev; + struct amdgpu_device *adev = dev->dev_private; struct amdgpu_encoder *amdgpu_encoder = to_amdgpu_encoder(encoder); struct amdgpu_encoder_atom_dig *dig = amdgpu_encoder->enc_priv; struct drm_connector *connector; + struct drm_connector_list_iter iter; struct amdgpu_connector *amdgpu_connector = NULL; struct cea_sad *sads; int i, sad_count; @@ -1244,12 +1259,14 @@ static void dce_v6_0_audio_write_sad_regs(struct drm_encoder *encoder) { ixAZALIA_F0_CODEC_PIN_CONTROL_AUDIO_DESCRIPTOR13, HDMI_AUDIO_CODING_TYPE_WMA_PRO }, }; - list_for_each_entry(connector, &encoder->dev->mode_config.connector_list, head) { + drm_connector_list_iter_begin(dev, &iter); + drm_for_each_connector_iter(connector, &iter) { if (connector->encoder == encoder) { amdgpu_connector = to_amdgpu_connector(connector); break; } } + drm_connector_list_iter_end(&iter); if (!amdgpu_connector) { DRM_ERROR("Couldn't find encoder's connector\n"); @@ -1632,6 +1649,7 @@ static void dce_v6_0_afmt_setmode(struct drm_encoder *encoder, struct amdgpu_encoder *amdgpu_encoder = to_amdgpu_encoder(encoder); struct amdgpu_encoder_atom_dig *dig = amdgpu_encoder->enc_priv; struct drm_connector *connector; + struct drm_connector_list_iter iter; struct amdgpu_connector *amdgpu_connector = NULL; int em = amdgpu_atombios_encoder_get_encoder_mode(encoder); int bpc = 8; @@ -1639,12 +1657,14 @@ static void dce_v6_0_afmt_setmode(struct drm_encoder *encoder, if (!dig || !dig->afmt) return; - list_for_each_entry(connector, &encoder->dev->mode_config.connector_list, head) { + drm_connector_list_iter_begin(dev, &iter); + drm_for_each_connector_iter(connector, &iter) { if (connector->encoder == encoder) { amdgpu_connector = to_amdgpu_connector(connector); break; } } + drm_connector_list_iter_end(&iter); if (!amdgpu_connector) { DRM_ERROR("Couldn't find encoder's connector\n"); diff --git a/drivers/gpu/drm/amd/amdgpu/dce_v8_0.c b/drivers/gpu/drm/amd/amdgpu/dce_v8_0.c index a16c5e9e610e..e5f50882a51d 100644 --- a/drivers/gpu/drm/amd/amdgpu/dce_v8_0.c +++ b/drivers/gpu/drm/amd/amdgpu/dce_v8_0.c @@ -275,9 +275,11 @@ static void dce_v8_0_hpd_init(struct amdgpu_device *adev) { struct drm_device *dev = adev->ddev; struct drm_connector *connector; + struct drm_connector_list_iter iter; u32 tmp; - list_for_each_entry(connector, &dev->mode_config.connector_list, head) { + drm_connector_list_iter_begin(dev, &iter); + drm_for_each_connector_iter(connector, &iter) { struct amdgpu_connector *amdgpu_connector = to_amdgpu_connector(connector); if (amdgpu_connector->hpd.hpd >= adev->mode_info.num_hpd) @@ -303,6 +305,7 @@ static void dce_v8_0_hpd_init(struct amdgpu_device *adev) dce_v8_0_hpd_set_polarity(adev, amdgpu_connector->hpd.hpd); amdgpu_irq_get(adev, &adev->hpd_irq, amdgpu_connector->hpd.hpd); } + drm_connector_list_iter_end(&iter); } /** @@ -317,9 +320,11 @@ static void dce_v8_0_hpd_fini(struct amdgpu_device *adev) { struct drm_device *dev = adev->ddev; struct drm_connector *connector; + struct drm_connector_list_iter iter; u32 tmp; - list_for_each_entry(connector, &dev->mode_config.connector_list, head) { + drm_connector_list_iter_begin(dev, &iter); + drm_for_each_connector_iter(connector, &iter) { struct amdgpu_connector *amdgpu_connector = to_amdgpu_connector(connector); if (amdgpu_connector->hpd.hpd >= adev->mode_info.num_hpd) @@ -331,6 +336,7 @@ static void dce_v8_0_hpd_fini(struct amdgpu_device *adev) amdgpu_irq_put(adev, &adev->hpd_irq, amdgpu_connector->hpd.hpd); } + drm_connector_list_iter_end(&iter); } static u32 dce_v8_0_hpd_get_gpio_reg(struct amdgpu_device *adev) @@ -1157,10 +1163,12 @@ static void dce_v8_0_afmt_audio_select_pin(struct drm_encoder *encoder) static void dce_v8_0_audio_write_latency_fields(struct drm_encoder *encoder, struct drm_display_mode *mode) { - struct amdgpu_device *adev = encoder->dev->dev_private; + struct drm_device *dev = encoder->dev; + struct amdgpu_device *adev = dev->dev_private; struct amdgpu_encoder *amdgpu_encoder = to_amdgpu_encoder(encoder); struct amdgpu_encoder_atom_dig *dig = amdgpu_encoder->enc_priv; struct drm_connector *connector; + struct drm_connector_list_iter iter; struct amdgpu_connector *amdgpu_connector = NULL; u32 tmp = 0, offset; @@ -1169,12 +1177,14 @@ static void dce_v8_0_audio_write_latency_fields(struct drm_encoder *encoder, offset = dig->afmt->pin->offset; - list_for_each_entry(connector, &encoder->dev->mode_config.connector_list, head) { + drm_connector_list_iter_begin(dev, &iter); + drm_for_each_connector_iter(connector, &iter) { if (connector->encoder == encoder) { amdgpu_connector = to_amdgpu_connector(connector); break; } } + drm_connector_list_iter_end(&iter); if (!amdgpu_connector) { DRM_ERROR("Couldn't find encoder's connector\n"); @@ -1214,10 +1224,12 @@ static void dce_v8_0_audio_write_latency_fields(struct drm_encoder *encoder, static void dce_v8_0_audio_write_speaker_allocation(struct drm_encoder *encoder) { - struct amdgpu_device *adev = encoder->dev->dev_private; + struct drm_device *dev = encoder->dev; + struct amdgpu_device *adev = dev->dev_private; struct amdgpu_encoder *amdgpu_encoder = to_amdgpu_encoder(encoder); struct amdgpu_encoder_atom_dig *dig = amdgpu_encoder->enc_priv; struct drm_connector *connector; + struct drm_connector_list_iter iter; struct amdgpu_connector *amdgpu_connector = NULL; u32 offset, tmp; u8 *sadb = NULL; @@ -1228,12 +1240,14 @@ static void dce_v8_0_audio_write_speaker_allocation(struct drm_encoder *encoder) offset = dig->afmt->pin->offset; - list_for_each_entry(connector, &encoder->dev->mode_config.connector_list, head) { + drm_connector_list_iter_begin(dev, &iter); + drm_for_each_connector_iter(connector, &iter) { if (connector->encoder == encoder) { amdgpu_connector = to_amdgpu_connector(connector); break; } } + drm_connector_list_iter_end(&iter); if (!amdgpu_connector) { DRM_ERROR("Couldn't find encoder's connector\n"); @@ -1263,11 +1277,13 @@ static void dce_v8_0_audio_write_speaker_allocation(struct drm_encoder *encoder) static void dce_v8_0_audio_write_sad_regs(struct drm_encoder *encoder) { - struct amdgpu_device *adev = encoder->dev->dev_private; + struct drm_device *dev = encoder->dev; + struct amdgpu_device *adev = dev->dev_private; struct amdgpu_encoder *amdgpu_encoder = to_amdgpu_encoder(encoder); struct amdgpu_encoder_atom_dig *dig = amdgpu_encoder->enc_priv; u32 offset; struct drm_connector *connector; + struct drm_connector_list_iter iter; struct amdgpu_connector *amdgpu_connector = NULL; struct cea_sad *sads; int i, sad_count; @@ -1292,12 +1308,14 @@ static void dce_v8_0_audio_write_sad_regs(struct drm_encoder *encoder) offset = dig->afmt->pin->offset; - list_for_each_entry(connector, &encoder->dev->mode_config.connector_list, head) { + drm_connector_list_iter_begin(dev, &iter); + drm_for_each_connector_iter(connector, &iter) { if (connector->encoder == encoder) { amdgpu_connector = to_amdgpu_connector(connector); break; } } + drm_connector_list_iter_end(&iter); if (!amdgpu_connector) { DRM_ERROR("Couldn't find encoder's connector\n"); 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 c67d3c41db19..887bc1d5d9e2 100644 --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c @@ -897,27 +897,29 @@ static int detect_mst_link_for_all_connectors(struct drm_device *dev) { struct amdgpu_dm_connector *aconnector; struct drm_connector *connector; + struct drm_connector_list_iter iter; int ret = 0; - drm_modeset_lock(&dev->mode_config.connection_mutex, NULL); - - list_for_each_entry(connector, &dev->mode_config.connector_list, head) { + drm_connector_list_iter_begin(dev, &iter); + drm_for_each_connector_iter(connector, &iter) { aconnector = to_amdgpu_dm_connector(connector); if (aconnector->dc_link->type == dc_connection_mst_branch && aconnector->mst_mgr.aux) { DRM_DEBUG_DRIVER("DM_MST: starting TM on aconnector: %p [id: %d]\n", - aconnector, aconnector->base.base.id); + aconnector, + aconnector->base.base.id); ret = drm_dp_mst_topology_mgr_set_mst(&aconnector->mst_mgr, true); if (ret < 0) { DRM_ERROR("DM_MST: Failed to start MST\n"); - ((struct dc_link *)aconnector->dc_link)->type = dc_connection_single; - return ret; - } + aconnector->dc_link->type = + dc_connection_single; + break; } + } } + drm_connector_list_iter_end(&iter); - drm_modeset_unlock(&dev->mode_config.connection_mutex); return ret; } @@ -955,14 +957,13 @@ static void s3_handle_mst(struct drm_device *dev, bool suspend) { struct amdgpu_dm_connector *aconnector; struct drm_connector *connector; + struct drm_connector_list_iter iter; struct drm_dp_mst_topology_mgr *mgr; int ret; bool need_hotplug = false; - drm_modeset_lock(&dev->mode_config.connection_mutex, NULL); - - list_for_each_entry(connector, &dev->mode_config.connector_list, - head) { + drm_connector_list_iter_begin(dev, &iter); + drm_for_each_connector_iter(connector, &iter) { aconnector = to_amdgpu_dm_connector(connector); if (aconnector->dc_link->type != dc_connection_mst_branch || aconnector->mst_port) @@ -980,8 +981,7 @@ static void s3_handle_mst(struct drm_device *dev, bool suspend) } } } - - drm_modeset_unlock(&dev->mode_config.connection_mutex); + drm_connector_list_iter_end(&iter); if (need_hotplug) drm_kms_helper_hotplug_event(dev); @@ -1163,6 +1163,7 @@ static int dm_resume(void *handle) struct amdgpu_display_manager *dm = &adev->dm; struct amdgpu_dm_connector *aconnector; struct drm_connector *connector; + struct drm_connector_list_iter iter; struct drm_crtc *crtc; struct drm_crtc_state *new_crtc_state; struct dm_crtc_state *dm_new_crtc_state; @@ -1195,7 +1196,8 @@ static int dm_resume(void *handle) amdgpu_dm_irq_resume_early(adev); /* Do detection*/ - list_for_each_entry(connector, &ddev->mode_config.connector_list, head) { + drm_connector_list_iter_begin(ddev, &iter); + drm_for_each_connector_iter(connector, &iter) { aconnector = to_amdgpu_dm_connector(connector); /* @@ -1223,6 +1225,7 @@ static int dm_resume(void *handle) amdgpu_dm_update_connector_after_detect(aconnector); mutex_unlock(&aconnector->hpd_lock); } + drm_connector_list_iter_end(&iter); /* Force mode set in atomic commit */ for_each_new_crtc_in_state(dm->cached_state, crtc, new_crtc_state, i) diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_irq.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_irq.c index fa5d503d379c..64445c4cc4c2 100644 --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_irq.c +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_irq.c @@ -732,8 +732,10 @@ void amdgpu_dm_hpd_init(struct amdgpu_device *adev) { struct drm_device *dev = adev->ddev; struct drm_connector *connector; + struct drm_connector_list_iter iter; - list_for_each_entry(connector, &dev->mode_config.connector_list, head) { + drm_connector_list_iter_begin(dev, &iter); + drm_for_each_connector_iter(connector, &iter) { struct amdgpu_dm_connector *amdgpu_dm_connector = to_amdgpu_dm_connector(connector); @@ -751,6 +753,7 @@ void amdgpu_dm_hpd_init(struct amdgpu_device *adev) true); } } + drm_connector_list_iter_end(&iter); } /** @@ -765,8 +768,10 @@ void amdgpu_dm_hpd_fini(struct amdgpu_device *adev) { struct drm_device *dev = adev->ddev; struct drm_connector *connector; + struct drm_connector_list_iter iter; - list_for_each_entry(connector, &dev->mode_config.connector_list, head) { + drm_connector_list_iter_begin(dev, &iter); + drm_for_each_connector_iter(connector, &iter) { struct amdgpu_dm_connector *amdgpu_dm_connector = to_amdgpu_dm_connector(connector); const struct dc_link *dc_link = amdgpu_dm_connector->dc_link; @@ -779,4 +784,5 @@ void amdgpu_dm_hpd_fini(struct amdgpu_device *adev) false); } } + drm_connector_list_iter_end(&iter); } -- cgit v1.2.3 From d20ebea8f0fabaac0048c7102a6befe37c2bb9c4 Mon Sep 17 00:00:00 2001 From: Lyude Paul Date: Tue, 16 Jul 2019 18:22:16 -0400 Subject: drm/amdgpu/dm: Resume short HPD IRQs before resuming MST topology MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Since we're going to be reprobing the entire topology state on resume now using sideband transactions, we need to ensure that we actually have short HPD irqs enabled before calling drm_dp_mst_topology_mgr_resume(). So, do that. Changes since v3: * Fix typo in comments Cc: Juston Li Cc: Imre Deak Cc: Ville Syrjälä Cc: Harry Wentland Cc: Daniel Vetter Acked-by: Alex Deucher Signed-off-by: Lyude Paul Link: https://patchwork.freedesktop.org/patch/msgid/20191022023641.8026-13-lyude@redhat.com --- drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) (limited to 'drivers/gpu/drm/amd/display') 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 887bc1d5d9e2..8f67d301ad81 100644 --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c @@ -1186,15 +1186,15 @@ static int dm_resume(void *handle) /* program HPD filter */ dc_resume(dm->dc); - /* On resume we need to rewrite the MSTM control bits to enamble MST*/ - s3_handle_mst(ddev, false); - /* * early enable HPD Rx IRQ, should be done before set mode as short * pulse interrupts are used for MST */ amdgpu_dm_irq_resume_early(adev); + /* On resume we need to rewrite the MSTM control bits to enable MST*/ + s3_handle_mst(ddev, false); + /* Do detection*/ drm_connector_list_iter_begin(ddev, &iter); drm_for_each_connector_iter(connector, &iter) { -- cgit v1.2.3 From 6f85f73821f6af4de4429ab2f2f7958dbd81cb90 Mon Sep 17 00:00:00 2001 From: Lyude Paul Date: Mon, 17 Jun 2019 19:57:33 -0400 Subject: drm/dp_mst: Add basic topology reprobing when resuming MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Finally! For a very long time, our MST helpers have had one very annoying issue: They don't know how to reprobe the topology state when coming out of suspend. This means that if a user has a machine connected to an MST topology and decides to suspend their machine, we lose all topology changes that happened during that period. That can be a big problem if the machine was connected to a different topology on the same port before resuming, as we won't bother reprobing any of the ports and likely cause the user's monitors not to come back up as expected. So, we start fixing this by teaching our MST helpers how to reprobe the link addresses of each connected topology when resuming. As it turns out, the behavior that we want here is identical to the behavior we want when initially probing a newly connected MST topology, with a couple of important differences: - We need to be more careful about handling the potential races between events from the MST hub that could change the topology state as we're performing the link address reprobe - We need to be more careful about handling unlikely state changes on ports - such as an input port turning into an output port, something that would be far more likely to happen in situations like the MST hub we're connected to being changed while we're suspend Both of which have been solved by previous commits. That leaves one requirement: - We need to prune any MST ports in our in-memory topology state that were present when suspending, but have not appeared in the post-resume link address response from their parent branch device Which we can now handle in this commit by modifying drm_dp_send_link_address(). We then introduce suspend/resume reprobing by introducing drm_dp_mst_topology_mgr_invalidate_mstb(), which we call in drm_dp_mst_topology_mgr_suspend() to traverse the in-memory topology state to indicate that each mstb needs it's link address resent and PBN resources reprobed. On resume, we start back up &mgr->work and have it reprobe the topology in the same way we would on a hotplug, removing any leftover ports that no longer appear in the topology state. Changes since v4: * Split indenting changes in drm_dp_mst_topology_mgr_resume() into a separate patch * Only fire hotplugs when something has actually changed after a link address probe * Don't try to change port->connector at all on ports, just throw out ports that need their connectors removed to make things easier. Cc: Juston Li Cc: Imre Deak Cc: Ville Syrjälä Cc: Harry Wentland Cc: Daniel Vetter Reviewed-by: Sean Paul Signed-off-by: Lyude Paul Link: https://patchwork.freedesktop.org/patch/msgid/20191022023641.8026-14-lyude@redhat.com --- drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 2 +- drivers/gpu/drm/drm_dp_mst_topology.c | 182 ++++++++++++++++++---- drivers/gpu/drm/i915/display/intel_dp.c | 3 +- drivers/gpu/drm/nouveau/dispnv50/disp.c | 6 +- include/drm/drm_dp_mst_helper.h | 3 +- 5 files changed, 156 insertions(+), 40 deletions(-) (limited to 'drivers/gpu/drm/amd/display') 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 8f67d301ad81..6c34f640f419 100644 --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c @@ -974,7 +974,7 @@ static void s3_handle_mst(struct drm_device *dev, bool suspend) if (suspend) { drm_dp_mst_topology_mgr_suspend(mgr); } else { - ret = drm_dp_mst_topology_mgr_resume(mgr); + ret = drm_dp_mst_topology_mgr_resume(mgr, true); if (ret < 0) { drm_dp_mst_topology_mgr_set_mst(mgr, false); need_hotplug = true; diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c index 588b67cea052..42eac2a59a4b 100644 --- a/drivers/gpu/drm/drm_dp_mst_topology.c +++ b/drivers/gpu/drm/drm_dp_mst_topology.c @@ -67,8 +67,8 @@ static int drm_dp_send_dpcd_write(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port, int offset, int size, u8 *bytes); -static void drm_dp_send_link_address(struct drm_dp_mst_topology_mgr *mgr, - struct drm_dp_mst_branch *mstb); +static int drm_dp_send_link_address(struct drm_dp_mst_topology_mgr *mgr, + struct drm_dp_mst_branch *mstb); static int drm_dp_send_enum_path_resources(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_branch *mstb, struct drm_dp_mst_port *port); @@ -1977,7 +1977,7 @@ drm_dp_mst_add_port(struct drm_device *dev, return port; } -static void +static int drm_dp_mst_handle_link_address_port(struct drm_dp_mst_branch *mstb, struct drm_device *dev, struct drm_dp_link_addr_reply_port *port_msg) @@ -1986,33 +1986,45 @@ drm_dp_mst_handle_link_address_port(struct drm_dp_mst_branch *mstb, struct drm_dp_mst_port *port; int old_ddps = 0, ret; u8 new_pdt = DP_PEER_DEVICE_NONE; - bool created = false, send_link_addr = false; + bool created = false, send_link_addr = false, changed = false; port = drm_dp_get_port(mstb, port_msg->port_number); if (!port) { port = drm_dp_mst_add_port(dev, mgr, mstb, port_msg->port_number); if (!port) - return; + return -ENOMEM; created = true; - } else if (port_msg->input_port && !port->input && port->connector) { - /* Destroying the connector is impossible in this context, so - * replace the port with a new one + changed = true; + } else if (!port->input && port_msg->input_port && port->connector) { + /* Since port->connector can't be changed here, we create a + * new port if input_port changes from 0 to 1 */ drm_dp_mst_topology_unlink_port(mgr, port); drm_dp_mst_topology_put_port(port); - port = drm_dp_mst_add_port(dev, mgr, mstb, port_msg->port_number); if (!port) - return; + return -ENOMEM; + changed = true; created = true; - } else { - /* Locking is only needed when the port has a connector - * exposed to userspace + } else if (port->input && !port_msg->input_port) { + changed = true; + } else if (port->connector) { + /* We're updating a port that's exposed to userspace, so do it + * under lock */ drm_modeset_lock(&mgr->base.lock, NULL); + old_ddps = port->ddps; + changed = port->ddps != port_msg->ddps || + (port->ddps && + (port->ldps != port_msg->legacy_device_plug_status || + port->dpcd_rev != port_msg->dpcd_revision || + port->mcs != port_msg->mcs || + port->pdt != port_msg->peer_device_type || + port->num_sdp_stream_sinks != + port_msg->num_sdp_stream_sinks)); } port->input = port_msg->input_port; @@ -2054,23 +2066,38 @@ drm_dp_mst_handle_link_address_port(struct drm_dp_mst_branch *mstb, goto fail; } - if (!created) + /* + * If this port wasn't just created, then we're reprobing because + * we're coming out of suspend. In this case, always resend the link + * address if there's an MSTB on this port + */ + if (!created && port->pdt == DP_PEER_DEVICE_MST_BRANCHING) + send_link_addr = true; + + if (port->connector) drm_modeset_unlock(&mgr->base.lock); - else if (!port->connector && !port->input) + else if (!port->input) drm_dp_mst_port_add_connector(mstb, port); - if (send_link_addr && port->mstb) - drm_dp_send_link_address(mgr, port->mstb); + if (send_link_addr && port->mstb) { + ret = drm_dp_send_link_address(mgr, port->mstb); + if (ret == 1) /* MSTB below us changed */ + changed = true; + else if (ret < 0) + goto fail_put; + } /* put reference to this port */ drm_dp_mst_topology_put_port(port); - return; + return changed; fail: drm_dp_mst_topology_unlink_port(mgr, port); - drm_dp_mst_topology_put_port(port); - if (!created) + if (port->connector) drm_modeset_unlock(&mgr->base.lock); +fail_put: + drm_dp_mst_topology_put_port(port); + return ret; } static void @@ -2228,13 +2255,20 @@ drm_dp_get_mst_branch_device_by_guid(struct drm_dp_mst_topology_mgr *mgr, return mstb; } -static void drm_dp_check_and_send_link_address(struct drm_dp_mst_topology_mgr *mgr, +static int drm_dp_check_and_send_link_address(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_branch *mstb) { struct drm_dp_mst_port *port; + int ret; + bool changed = false; - if (!mstb->link_address_sent) - drm_dp_send_link_address(mgr, mstb); + if (!mstb->link_address_sent) { + ret = drm_dp_send_link_address(mgr, mstb); + if (ret == 1) + changed = true; + else if (ret < 0) + return ret; + } list_for_each_entry(port, &mstb->ports, next) { struct drm_dp_mst_branch *mstb_child = NULL; @@ -2246,6 +2280,7 @@ static void drm_dp_check_and_send_link_address(struct drm_dp_mst_topology_mgr *m drm_modeset_lock(&mgr->base.lock, NULL); drm_dp_send_enum_path_resources(mgr, mstb, port); drm_modeset_unlock(&mgr->base.lock); + changed = true; } if (port->mstb) @@ -2253,10 +2288,17 @@ static void drm_dp_check_and_send_link_address(struct drm_dp_mst_topology_mgr *m mgr, port->mstb); if (mstb_child) { - drm_dp_check_and_send_link_address(mgr, mstb_child); + ret = drm_dp_check_and_send_link_address(mgr, + mstb_child); drm_dp_mst_topology_put_mstb(mstb_child); + if (ret == 1) + changed = true; + else if (ret < 0) + return ret; } } + + return changed; } static void drm_dp_mst_link_probe_work(struct work_struct *work) @@ -2282,11 +2324,12 @@ static void drm_dp_mst_link_probe_work(struct work_struct *work) return; } - drm_dp_check_and_send_link_address(mgr, mstb); + ret = drm_dp_check_and_send_link_address(mgr, mstb); drm_dp_mst_topology_put_mstb(mstb); mutex_unlock(&mgr->probe_lock); - drm_kms_helper_hotplug_event(dev); + if (ret) + drm_kms_helper_hotplug_event(dev); } static bool drm_dp_validate_guid(struct drm_dp_mst_topology_mgr *mgr, @@ -2532,16 +2575,18 @@ drm_dp_dump_link_address(struct drm_dp_link_address_ack_reply *reply) } } -static void drm_dp_send_link_address(struct drm_dp_mst_topology_mgr *mgr, +static int drm_dp_send_link_address(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_branch *mstb) { struct drm_dp_sideband_msg_tx *txmsg; struct drm_dp_link_address_ack_reply *reply; - int i, len, ret; + struct drm_dp_mst_port *port, *tmp; + int i, len, ret, port_mask = 0; + bool changed = false; txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); if (!txmsg) - return; + return -ENOMEM; txmsg->dst = mstb; len = build_link_address(txmsg); @@ -2567,14 +2612,39 @@ static void drm_dp_send_link_address(struct drm_dp_mst_topology_mgr *mgr, drm_dp_check_mstb_guid(mstb, reply->guid); - for (i = 0; i < reply->nports; i++) - drm_dp_mst_handle_link_address_port(mstb, mgr->dev, - &reply->ports[i]); + for (i = 0; i < reply->nports; i++) { + port_mask |= BIT(reply->ports[i].port_number); + ret = drm_dp_mst_handle_link_address_port(mstb, mgr->dev, + &reply->ports[i]); + if (ret == 1) + changed = true; + else if (ret < 0) + goto out; + } + + /* Prune any ports that are currently a part of mstb in our in-memory + * topology, but were not seen in this link address. Usually this + * means that they were removed while the topology was out of sync, + * e.g. during suspend/resume + */ + mutex_lock(&mgr->lock); + list_for_each_entry_safe(port, tmp, &mstb->ports, next) { + if (port_mask & BIT(port->port_num)) + continue; + + DRM_DEBUG_KMS("port %d was not in link address, removing\n", + port->port_num); + list_del(&port->next); + drm_dp_mst_topology_put_port(port); + changed = true; + } + mutex_unlock(&mgr->lock); out: if (ret <= 0) mstb->link_address_sent = false; kfree(txmsg); + return ret < 0 ? ret : changed; } static int @@ -3179,6 +3249,23 @@ out_unlock: } EXPORT_SYMBOL(drm_dp_mst_topology_mgr_set_mst); +static void +drm_dp_mst_topology_mgr_invalidate_mstb(struct drm_dp_mst_branch *mstb) +{ + struct drm_dp_mst_port *port; + + /* The link address will need to be re-sent on resume */ + mstb->link_address_sent = false; + + list_for_each_entry(port, &mstb->ports, next) { + /* The PBN for each port will also need to be re-probed */ + port->available_pbn = 0; + + if (port->mstb) + drm_dp_mst_topology_mgr_invalidate_mstb(port->mstb); + } +} + /** * drm_dp_mst_topology_mgr_suspend() - suspend the MST manager * @mgr: manager to suspend @@ -3195,20 +3282,36 @@ void drm_dp_mst_topology_mgr_suspend(struct drm_dp_mst_topology_mgr *mgr) flush_work(&mgr->up_req_work); flush_work(&mgr->work); flush_work(&mgr->delayed_destroy_work); + + mutex_lock(&mgr->lock); + if (mgr->mst_state && mgr->mst_primary) + drm_dp_mst_topology_mgr_invalidate_mstb(mgr->mst_primary); + mutex_unlock(&mgr->lock); } EXPORT_SYMBOL(drm_dp_mst_topology_mgr_suspend); /** * drm_dp_mst_topology_mgr_resume() - resume the MST manager * @mgr: manager to resume + * @sync: whether or not to perform topology reprobing synchronously * * This will fetch DPCD and see if the device is still there, * if it is, it will rewrite the MSTM control bits, and return. * - * if the device fails this returns -1, and the driver should do + * If the device fails this returns -1, and the driver should do * a full MST reprobe, in case we were undocked. + * + * During system resume (where it is assumed that the driver will be calling + * drm_atomic_helper_resume()) this function should be called beforehand with + * @sync set to true. In contexts like runtime resume where the driver is not + * expected to be calling drm_atomic_helper_resume(), this function should be + * called with @sync set to false in order to avoid deadlocking. + * + * Returns: -1 if the MST topology was removed while we were suspended, 0 + * otherwise. */ -int drm_dp_mst_topology_mgr_resume(struct drm_dp_mst_topology_mgr *mgr) +int drm_dp_mst_topology_mgr_resume(struct drm_dp_mst_topology_mgr *mgr, + bool sync) { int ret; u8 guid[16]; @@ -3241,8 +3344,19 @@ int drm_dp_mst_topology_mgr_resume(struct drm_dp_mst_topology_mgr *mgr) } drm_dp_check_mstb_guid(mgr->mst_primary, guid); + /* + * For the final step of resuming the topology, we need to bring the + * state of our in-memory topology back into sync with reality. So, + * restart the probing process as if we're probing a new hub + */ + queue_work(system_long_wq, &mgr->work); mutex_unlock(&mgr->lock); + if (sync) { + DRM_DEBUG_KMS("Waiting for link probe work to finish re-syncing topology...\n"); + flush_work(&mgr->work); + } + return 0; out_fail: diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c index 5eeafa45831a..403b593a3eb4 100644 --- a/drivers/gpu/drm/i915/display/intel_dp.c +++ b/drivers/gpu/drm/i915/display/intel_dp.c @@ -7625,7 +7625,8 @@ void intel_dp_mst_resume(struct drm_i915_private *dev_priv) if (!intel_dp->can_mst) continue; - ret = drm_dp_mst_topology_mgr_resume(&intel_dp->mst_mgr); + ret = drm_dp_mst_topology_mgr_resume(&intel_dp->mst_mgr, + true); if (ret) { intel_dp->is_mst = false; drm_dp_mst_topology_mgr_set_mst(&intel_dp->mst_mgr, diff --git a/drivers/gpu/drm/nouveau/dispnv50/disp.c b/drivers/gpu/drm/nouveau/dispnv50/disp.c index a9d6aa110cfd..549486f1d937 100644 --- a/drivers/gpu/drm/nouveau/dispnv50/disp.c +++ b/drivers/gpu/drm/nouveau/dispnv50/disp.c @@ -1309,14 +1309,14 @@ nv50_mstm_fini(struct nv50_mstm *mstm) } static void -nv50_mstm_init(struct nv50_mstm *mstm) +nv50_mstm_init(struct nv50_mstm *mstm, bool runtime) { int ret; if (!mstm || !mstm->mgr.mst_state) return; - ret = drm_dp_mst_topology_mgr_resume(&mstm->mgr); + ret = drm_dp_mst_topology_mgr_resume(&mstm->mgr, !runtime); if (ret == -1) { drm_dp_mst_topology_mgr_set_mst(&mstm->mgr, false); drm_kms_helper_hotplug_event(mstm->mgr.dev); @@ -2263,7 +2263,7 @@ nv50_display_init(struct drm_device *dev, bool resume, bool runtime) if (encoder->encoder_type != DRM_MODE_ENCODER_DPMST) { struct nouveau_encoder *nv_encoder = nouveau_encoder(encoder); - nv50_mstm_init(nv_encoder->dp.mstm); + nv50_mstm_init(nv_encoder->dp.mstm, runtime); } } diff --git a/include/drm/drm_dp_mst_helper.h b/include/drm/drm_dp_mst_helper.h index fd142db42cb0..144027e27464 100644 --- a/include/drm/drm_dp_mst_helper.h +++ b/include/drm/drm_dp_mst_helper.h @@ -706,7 +706,8 @@ void drm_dp_mst_dump_topology(struct seq_file *m, void drm_dp_mst_topology_mgr_suspend(struct drm_dp_mst_topology_mgr *mgr); int __must_check -drm_dp_mst_topology_mgr_resume(struct drm_dp_mst_topology_mgr *mgr); +drm_dp_mst_topology_mgr_resume(struct drm_dp_mst_topology_mgr *mgr, + bool sync); ssize_t drm_dp_mst_dpcd_read(struct drm_dp_aux *aux, unsigned int offset, void *buffer, size_t size); -- cgit v1.2.3