From patchwork Tue May 26 12:41:55 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Jani Nikula X-Patchwork-Id: 11570459 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id D384C14F6 for ; Tue, 26 May 2020 12:42:18 +0000 (UTC) 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 mail.kernel.org (Postfix) with ESMTPS id BC2622088E for ; Tue, 26 May 2020 12:42:18 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org BC2622088E Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=intel.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=intel-gfx-bounces@lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 50B346E187; Tue, 26 May 2020 12:42:18 +0000 (UTC) X-Original-To: intel-gfx@lists.freedesktop.org Delivered-To: intel-gfx@lists.freedesktop.org Received: from mga17.intel.com (mga17.intel.com [192.55.52.151]) by gabe.freedesktop.org (Postfix) with ESMTPS id 287C46E187 for ; Tue, 26 May 2020 12:42:17 +0000 (UTC) IronPort-SDR: JNovn8TkE5NUwFNWPTyay9A1cZeqDl+4OKvf2OnWFnkfC3R6L50gbE9wbCIHmdVH7DLf8slWPD uC0ki4m3cXzw== X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga005.jf.intel.com ([10.7.209.41]) by fmsmga107.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 26 May 2020 05:42:16 -0700 IronPort-SDR: YVPQWz1EW58hX6ZoPHl7GpQSOLPkUxSQNo9IoDt1B2FAJgylLNT8KOoKbbYEyyvkenyPXtYWA4 oKhkodbdggDg== X-IronPort-AV: E=Sophos;i="5.73,437,1583222400"; d="scan'208";a="442067806" Received: from ygershon-mobl2.ger.corp.intel.com (HELO localhost) ([10.252.42.149]) by orsmga005-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 26 May 2020 05:42:13 -0700 From: Jani Nikula To: intel-gfx@lists.freedesktop.org Date: Tue, 26 May 2020 15:41:55 +0300 Message-Id: <20200526124156.29319-3-jani.nikula@intel.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200526124156.29319-1-jani.nikula@intel.com> References: <20200526124156.29319-1-jani.nikula@intel.com> MIME-Version: 1.0 Subject: [Intel-gfx] [CI 3/4] drm/i915/params: prevent changing module params runtime 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: , Cc: Jani Nikula , =?utf-8?q?Juha-Pekka_Heikkil=C3=A4?= Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" Only support runtime changes through the debugfs. i915.verbose_state_checks remains an exception, and is not exposed via debugfs. This depends on IGT having been updated to use the debugfs for modifying the parameters. Cc: Juha-Pekka Heikkilä Cc: Venkata Sandeep Dhanalakota Reviewed-by: Juha-Pekka Heikkila Signed-off-by: Jani Nikula --- drivers/gpu/drm/i915/i915_params.c | 38 +++++++++++++++++++----------- 1 file changed, 24 insertions(+), 14 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_params.c b/drivers/gpu/drm/i915/i915_params.c index a3dde770226d..ace44ad7e6df 100644 --- a/drivers/gpu/drm/i915/i915_params.c +++ b/drivers/gpu/drm/i915/i915_params.c @@ -40,6 +40,15 @@ struct i915_params i915_modparams __read_mostly = { #undef MEMBER }; +/* + * Note: As a rule, keep module parameter sysfs permissions read-only + * 0400. Runtime changes are only supported through i915 debugfs. + * + * For any exceptions requiring write access and runtime changes through module + * parameter sysfs, prevent debugfs file creation by setting the parameter's + * debugfs mode to 0. + */ + i915_param_named(modeset, int, 0400, "Use kernel modesetting [KMS] (0=disable, " "1=on, -1=force vga console preference [default])"); @@ -49,7 +58,7 @@ i915_param_named_unsafe(enable_dc, int, 0400, "(-1=auto [default]; 0=disable; 1=up to DC5; 2=up to DC6; " "3=up to DC5 with DC3CO; 4=up to DC6 with DC3CO)"); -i915_param_named_unsafe(enable_fbc, int, 0600, +i915_param_named_unsafe(enable_fbc, int, 0400, "Enable frame buffer compression for power savings " "(default: -1 (use per-chip default))"); @@ -57,7 +66,7 @@ i915_param_named_unsafe(lvds_channel_mode, int, 0400, "Specify LVDS channel mode " "(0=probe BIOS [default], 1=single-channel, 2=dual-channel)"); -i915_param_named_unsafe(panel_use_ssc, int, 0600, +i915_param_named_unsafe(panel_use_ssc, int, 0400, "Use Spread Spectrum Clock with panels [LVDS/eDP] " "(default: auto from VBT)"); @@ -65,25 +74,25 @@ i915_param_named_unsafe(vbt_sdvo_panel_type, int, 0400, "Override/Ignore selection of SDVO panel mode in the VBT " "(-2=ignore, -1=auto [default], index in VBT BIOS table)"); -i915_param_named_unsafe(reset, int, 0600, +i915_param_named_unsafe(reset, int, 0400, "Attempt GPU resets (0=disabled, 1=full gpu reset, 2=engine reset [default])"); i915_param_named_unsafe(vbt_firmware, charp, 0400, "Load VBT from specified file under /lib/firmware"); #if IS_ENABLED(CONFIG_DRM_I915_CAPTURE_ERROR) -i915_param_named(error_capture, bool, 0600, +i915_param_named(error_capture, bool, 0400, "Record the GPU state following a hang. " "This information in /sys/class/drm/card/error is vital for " "triaging and debugging hangs."); #endif -i915_param_named_unsafe(enable_hangcheck, bool, 0600, +i915_param_named_unsafe(enable_hangcheck, bool, 0400, "Periodically check GPU activity for detecting hangs. " "WARNING: Disabling this can cause system wide hangs. " "(default: true)"); -i915_param_named_unsafe(enable_psr, int, 0600, +i915_param_named_unsafe(enable_psr, int, 0400, "Enable PSR " "(0=disabled, 1=enabled) " "Default: -1 (use per-chip default)"); @@ -96,22 +105,22 @@ i915_param_named_unsafe(disable_power_well, int, 0400, "Disable display power wells when possible " "(-1=auto [default], 0=power wells always on, 1=power wells disabled when possible)"); -i915_param_named_unsafe(enable_ips, int, 0600, "Enable IPS (default: true)"); +i915_param_named_unsafe(enable_ips, int, 0400, "Enable IPS (default: true)"); -i915_param_named(fastboot, int, 0600, +i915_param_named(fastboot, int, 0400, "Try to skip unnecessary mode sets at boot time " "(0=disabled, 1=enabled) " "Default: -1 (use per-chip default)"); -i915_param_named_unsafe(load_detect_test, bool, 0600, +i915_param_named_unsafe(load_detect_test, bool, 0400, "Force-enable the VGA load detect code for testing (default:false). " "For developers only."); -i915_param_named_unsafe(force_reset_modeset_test, bool, 0600, +i915_param_named_unsafe(force_reset_modeset_test, bool, 0400, "Force a modeset during gpu reset for testing (default:false). " "For developers only."); -i915_param_named_unsafe(invert_brightness, int, 0600, +i915_param_named_unsafe(invert_brightness, int, 0400, "Invert backlight brightness " "(-1 force normal, 0 machine defaults, 1 force inversion), please " "report PCI device ID, subsystem vendor and subsystem device ID " @@ -121,10 +130,11 @@ i915_param_named_unsafe(invert_brightness, int, 0600, i915_param_named(disable_display, bool, 0400, "Disable display (default: false)"); -i915_param_named(mmio_debug, int, 0600, +i915_param_named(mmio_debug, int, 0400, "Enable the MMIO debug code for the first N failures (default: off). " "This may negatively affect performance."); +/* Special case writable file */ i915_param_named(verbose_state_checks, bool, 0600, "Enable verbose logs (ie. WARN_ON()) in case of unexpected hw state conditions."); @@ -155,7 +165,7 @@ i915_param_named_unsafe(huc_firmware_path, charp, 0400, i915_param_named_unsafe(dmc_firmware_path, charp, 0400, "DMC firmware path to use instead of the default one"); -i915_param_named_unsafe(enable_dp_mst, bool, 0600, +i915_param_named_unsafe(enable_dp_mst, bool, 0400, "Enable multi-stream transport (MST) for new DisplayPort sinks. (default: true)"); #if IS_ENABLED(CONFIG_DRM_I915_DEBUG) @@ -163,7 +173,7 @@ i915_param_named_unsafe(inject_probe_failure, uint, 0400, "Force an error after a number of failure check points (0:disabled (default), N:force failure at the Nth failure check point)"); #endif -i915_param_named(enable_dpcd_backlight, int, 0600, +i915_param_named(enable_dpcd_backlight, int, 0400, "Enable support for DPCD backlight control" "(-1=use per-VBT LFP backlight type setting [default], 0=disabled, 1=enabled)");