From patchwork Thu Oct 3 18:15:53 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Ville Syrjala X-Patchwork-Id: 13821376 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 9EA1ACF34BD for ; Thu, 3 Oct 2024 18:15:58 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 4836310E8C8; Thu, 3 Oct 2024 18:15:58 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=intel.com header.i=@intel.com header.b="EjZ9msV8"; dkim-atps=neutral Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.19]) by gabe.freedesktop.org (Postfix) with ESMTPS id 7C72F10E240; Thu, 3 Oct 2024 18:15:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1727979358; x=1759515358; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=nC1DkYF8+JnC9bRqRYD8jIOLHS7p+55kYwVDJUu0JlY=; b=EjZ9msV8ZZyYBX2EoY26NNotz/XdgPSP3UDcBK4RiNkCP8NrAD2amIIT nD3QT0rap0nPHMr2LwZKFf0Avo4E/AYTNMp7jQ7bNwNE9TbLsyw4kp9rF C41vFxlJcuJ1t6m3duyG9pp84s59t5BCZCAtMoziGdgYTD9dBL04KVb87 yN72OZ1fPNJSG22zEX803lnahbbur1ErrClazs9y3Rk7jSMjii3n1kIZd Rvyblg2P1wCD6vcqZofD8TX24rjnRGQVIR/qJ4SqUD9uIjSfalG/sT28u HqsTDMYxNUHHlgZTxG3CpucUYvnzSFtf5CzPRSBCjHLF+J+2eJt4U10EG g==; X-CSE-ConnectionGUID: ZphkC1AgSWaQceA1gNMtxQ== X-CSE-MsgGUID: LxyQ54S0T5WPF0+jpV7tww== X-IronPort-AV: E=McAfee;i="6700,10204,11214"; a="27070042" X-IronPort-AV: E=Sophos;i="6.11,175,1725346800"; d="scan'208";a="27070042" Received: from fmviesa008.fm.intel.com ([10.60.135.148]) by orvoesa111.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 03 Oct 2024 11:15:57 -0700 X-CSE-ConnectionGUID: AWpG6aMWTQSWY2XMipq25A== X-CSE-MsgGUID: YdyH8NLpQy6+eEpC+/XTJw== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.11,175,1725346800"; d="scan'208";a="74543878" Received: from stinkpipe.fi.intel.com (HELO stinkbox) ([10.237.72.74]) by fmviesa008.fm.intel.com with SMTP; 03 Oct 2024 11:15:54 -0700 Received: by stinkbox (sSMTP sendmail emulation); Thu, 03 Oct 2024 21:15:53 +0300 From: Ville Syrjala To: dri-devel@lists.freedesktop.org Cc: intel-gfx@lists.freedesktop.org Subject: [PATCH v2 4/8] drm/client: Make copies of modes Date: Thu, 3 Oct 2024 21:15:53 +0300 Message-ID: <20241003181553.8891-1-ville.syrjala@linux.intel.com> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20241003113304.11700-5-ville.syrjala@linux.intel.com> References: <20241003113304.11700-5-ville.syrjala@linux.intel.com> MIME-Version: 1.0 X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" From: Ville Syrjälä drm_client_firmware_config() is currently picking up the current mode of the crtc via the legacy crtc->mode, which is not supposed to be used by atomic drivers at all. We can't simply switch over to the proper crtc->state->mode because we drop the crtc->mutex (which protects crtc->state) before the mode gets used. The most straightforward solution to extend the lifetime of modes[] seem to be to make full copies of the modes instead of just storing pointers. We do have to replace the NULL checks with something else though. Checking that mode->clock!=0 should be sufficient. And with this we can undo also commit 3eadd887dbac ("drm/client:Fully protect modes[] with dev->mode_config.mutex") as the lifetime of modes[] no longer has anything to do with that lock. v2: Don't try to copy NULL modes Signed-off-by: Ville Syrjälä --- drivers/gpu/drm/drm_client_modeset.c | 96 +++++++++++++++++----------- 1 file changed, 59 insertions(+), 37 deletions(-) diff --git a/drivers/gpu/drm/drm_client_modeset.c b/drivers/gpu/drm/drm_client_modeset.c index 888323137a6a..730ed0d4bfa9 100644 --- a/drivers/gpu/drm/drm_client_modeset.c +++ b/drivers/gpu/drm/drm_client_modeset.c @@ -265,10 +265,21 @@ static void drm_client_connectors_enabled(struct drm_connector *connectors[], enabled[i] = drm_connector_enabled(connectors[i], false); } +static bool mode_valid(const struct drm_display_mode *mode) +{ + return mode->clock != 0; +} + +static void mode_copy_if_not_null(struct drm_display_mode *dst, const struct drm_display_mode *src) +{ + if (src) + drm_mode_copy(dst, src); +} + static bool drm_client_target_cloned(struct drm_device *dev, struct drm_connector *connectors[], unsigned int connector_count, - const struct drm_display_mode *modes[], + struct drm_display_mode modes[], struct drm_client_offset offsets[], bool enabled[], int width, int height) { @@ -296,15 +307,16 @@ static bool drm_client_target_cloned(struct drm_device *dev, for (i = 0; i < connector_count; i++) { if (!enabled[i]) continue; - modes[i] = drm_connector_pick_cmdline_mode(connectors[i]); - if (!modes[i]) { + + mode_copy_if_not_null(&modes[i], drm_connector_pick_cmdline_mode(connectors[i])); + if (!mode_valid(&modes[i])) { can_clone = false; break; } for (j = 0; j < i; j++) { if (!enabled[j]) continue; - if (!drm_mode_match(modes[j], modes[i], + if (!drm_mode_match(&modes[j], &modes[i], DRM_MODE_MATCH_TIMINGS | DRM_MODE_MATCH_CLOCK | DRM_MODE_MATCH_FLAGS | @@ -335,9 +347,9 @@ static bool drm_client_target_cloned(struct drm_device *dev, DRM_MODE_MATCH_CLOCK | DRM_MODE_MATCH_FLAGS | DRM_MODE_MATCH_3D_FLAGS)) - modes[i] = mode; + mode_copy_if_not_null(&modes[i], mode); } - if (!modes[i]) + if (!mode_valid(&modes[i])) can_clone = false; } drm_mode_destroy(dev, dmt_mode); @@ -354,7 +366,7 @@ static bool drm_client_target_cloned(struct drm_device *dev, static int drm_client_get_tile_offsets(struct drm_device *dev, struct drm_connector *connectors[], unsigned int connector_count, - const struct drm_display_mode *modes[], + const struct drm_display_mode modes[], struct drm_client_offset offsets[], int idx, int h_idx, int v_idx) @@ -368,17 +380,17 @@ static int drm_client_get_tile_offsets(struct drm_device *dev, if (!connector->has_tile) continue; - if (!modes[i] && (h_idx || v_idx)) { + if (!mode_valid(&modes[i]) && (h_idx || v_idx)) { drm_dbg_kms(dev, "[CONNECTOR:%d:%s] no modes for connector tiled %d\n", connector->base.id, connector->name, i); continue; } if (connector->tile_h_loc < h_idx) - hoffset += modes[i]->hdisplay; + hoffset += modes[i].hdisplay; if (connector->tile_v_loc < v_idx) - voffset += modes[i]->vdisplay; + voffset += modes[i].vdisplay; } offsets[idx].x = hoffset; offsets[idx].y = voffset; @@ -389,7 +401,7 @@ static int drm_client_get_tile_offsets(struct drm_device *dev, static bool drm_client_target_preferred(struct drm_device *dev, struct drm_connector *connectors[], unsigned int connector_count, - const struct drm_display_mode *modes[], + struct drm_display_mode modes[], struct drm_client_offset offsets[], bool enabled[], int width, int height) { @@ -445,16 +457,19 @@ static bool drm_client_target_preferred(struct drm_device *dev, } mode_type = "cmdline"; - modes[i] = drm_connector_pick_cmdline_mode(connector); + mode_copy_if_not_null(&modes[i], + drm_connector_pick_cmdline_mode(connector)); - if (!modes[i]) { + if (!mode_valid(&modes[i])) { mode_type = "preferred"; - modes[i] = drm_connector_preferred_mode(connector, width, height); + mode_copy_if_not_null(&modes[i], + drm_connector_preferred_mode(connector, width, height)); } - if (!modes[i]) { + if (!mode_valid(&modes[i])) { mode_type = "first"; - modes[i] = drm_connector_first_mode(connector); + mode_copy_if_not_null(&modes[i], + drm_connector_first_mode(connector)); } /* @@ -472,17 +487,19 @@ static bool drm_client_target_preferred(struct drm_device *dev, connector->tile_v_loc == 0 && !drm_connector_get_tiled_mode(connector))) { mode_type = "non tiled"; - modes[i] = drm_connector_fallback_non_tiled_mode(connector); + mode_copy_if_not_null(&modes[i], + drm_connector_fallback_non_tiled_mode(connector)); } else { mode_type = "tiled"; - modes[i] = drm_connector_get_tiled_mode(connector); + mode_copy_if_not_null(&modes[i], + drm_connector_get_tiled_mode(connector)); } } - if (modes[i]) + if (mode_valid(&modes[i])) drm_dbg_kms(dev, "[CONNECTOR:%d:%s] found %s mode: %s\n", connector->base.id, connector->name, - mode_type, modes[i]->name); + mode_type, modes[i].name); else drm_dbg_kms(dev, "[CONNECTOR:%d:%s] no mode found\n", connector->base.id, connector->name); @@ -514,7 +531,7 @@ static int drm_client_pick_crtcs(struct drm_client_dev *client, struct drm_connector *connectors[], unsigned int connector_count, struct drm_crtc *best_crtcs[], - const struct drm_display_mode *modes[], + const struct drm_display_mode modes[], int n, int width, int height) { struct drm_device *dev = client->dev; @@ -532,7 +549,7 @@ static int drm_client_pick_crtcs(struct drm_client_dev *client, best_crtcs[n] = NULL; best_score = drm_client_pick_crtcs(client, connectors, connector_count, best_crtcs, modes, n + 1, width, height); - if (modes[n] == NULL) + if (!mode_valid(&modes[n])) return best_score; crtcs = kcalloc(connector_count, sizeof(*crtcs), GFP_KERNEL); @@ -566,7 +583,7 @@ static int drm_client_pick_crtcs(struct drm_client_dev *client, if (dev->mode_config.num_crtc > 1) continue; - if (!drm_mode_equal(modes[o], modes[n])) + if (!drm_mode_equal(&modes[o], &modes[n])) continue; } @@ -589,7 +606,7 @@ static bool drm_client_firmware_config(struct drm_client_dev *client, struct drm_connector *connectors[], unsigned int connector_count, struct drm_crtc *crtcs[], - const struct drm_display_mode *modes[], + struct drm_display_mode modes[], struct drm_client_offset offsets[], bool enabled[], int width, int height) { @@ -690,20 +707,23 @@ static bool drm_client_firmware_config(struct drm_client_dev *client, } mode_type = "cmdline"; - modes[i] = drm_connector_pick_cmdline_mode(connector); + mode_copy_if_not_null(&modes[i], + drm_connector_pick_cmdline_mode(connector)); - if (!modes[i]) { + if (!mode_valid(&modes[i])) { mode_type = "preferred"; - modes[i] = drm_connector_preferred_mode(connector, width, height); + mode_copy_if_not_null(&modes[i], + drm_connector_preferred_mode(connector, width, height)); } - if (!modes[i]) { + if (!mode_valid(&modes[i])) { mode_type = "first"; - modes[i] = drm_connector_first_mode(connector); + mode_copy_if_not_null(&modes[i], + drm_connector_first_mode(connector)); } /* last resort: use current mode */ - if (!modes[i]) { + if (!mode_valid(&modes[i])) { /* * IMPORTANT: We want to use the adjusted mode (i.e. * after the panel fitter upscaling) as the initial @@ -716,7 +736,8 @@ static bool drm_client_firmware_config(struct drm_client_dev *client, * fastboot check to work correctly. */ mode_type = "current"; - modes[i] = &connector->state->crtc->mode; + mode_copy_if_not_null(&modes[i], + &connector->state->crtc->mode); } /* @@ -726,14 +747,15 @@ static bool drm_client_firmware_config(struct drm_client_dev *client, if (connector->has_tile && num_tiled_conns < connector->num_h_tile * connector->num_v_tile) { mode_type = "non tiled"; - modes[i] = drm_connector_fallback_non_tiled_mode(connector); + mode_copy_if_not_null(&modes[i], + drm_connector_fallback_non_tiled_mode(connector)); } crtcs[i] = new_crtc; drm_dbg_kms(dev, "[CONNECTOR::%d:%s] on [CRTC:%d:%s] using %s mode: %s\n", connector->base.id, connector->name, new_crtc->base.id, new_crtc->name, - mode_type, modes[i]->name); + mode_type, modes[i].name); fallback = false; conn_configured |= BIT(i); @@ -789,8 +811,7 @@ int drm_client_modeset_probe(struct drm_client_dev *client, unsigned int width, unsigned int total_modes_count = 0; struct drm_client_offset *offsets; unsigned int connector_count = 0; - /* points to modes protected by mode_config.mutex */ - const struct drm_display_mode **modes; + struct drm_display_mode *modes; struct drm_crtc **crtcs; int i, ret = 0; bool *enabled; @@ -858,10 +879,12 @@ int drm_client_modeset_probe(struct drm_client_dev *client, unsigned int width, crtcs, modes, 0, width, height); } + mutex_unlock(&dev->mode_config.mutex); + drm_client_modeset_release(client); for (i = 0; i < connector_count; i++) { - const struct drm_display_mode *mode = modes[i]; + const struct drm_display_mode *mode = &modes[i]; struct drm_crtc *crtc = crtcs[i]; struct drm_client_offset *offset = &offsets[i]; @@ -892,7 +915,6 @@ int drm_client_modeset_probe(struct drm_client_dev *client, unsigned int width, modeset->y = offset->y; } } - mutex_unlock(&dev->mode_config.mutex); mutex_unlock(&client->modeset_mutex); out: