From patchwork Wed Feb 19 16:18:22 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Micha=C5=82_Winiarski?= X-Patchwork-Id: 11391803 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 CF626139A for ; Wed, 19 Feb 2020 16:18:42 +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 B805F2067D for ; Wed, 19 Feb 2020 16:18:42 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org B805F2067D 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 EBDA86EC50; Wed, 19 Feb 2020 16:18:38 +0000 (UTC) X-Original-To: intel-gfx@lists.freedesktop.org Delivered-To: intel-gfx@lists.freedesktop.org Received: from mga04.intel.com (mga04.intel.com [192.55.52.120]) by gabe.freedesktop.org (Postfix) with ESMTPS id E515C6EC4C for ; Wed, 19 Feb 2020 16:18:36 +0000 (UTC) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga005.jf.intel.com ([10.7.209.41]) by fmsmga104.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 19 Feb 2020 08:18:36 -0800 X-IronPort-AV: E=Sophos;i="5.70,461,1574150400"; d="scan'208";a="408483820" Received: from mwiniars-main.igk.intel.com (HELO localhost) ([172.28.172.64]) by orsmga005-auth.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 19 Feb 2020 08:18:34 -0800 From: =?utf-8?q?Micha=C5=82_Winiarski?= To: intel-gfx@lists.freedesktop.org Date: Wed, 19 Feb 2020 17:18:22 +0100 Message-Id: <20200219161822.24592-2-michal.winiarski@intel.com> X-Mailer: git-send-email 2.21.1 In-Reply-To: <20200219161822.24592-1-michal.winiarski@intel.com> References: <20200219161822.24592-1-michal.winiarski@intel.com> MIME-Version: 1.0 Subject: [Intel-gfx] [PATCH 2/2] drm/i915/pmu: Avoid using globals for PMU events 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" Attempting to bind / unbind module from devices where we have both integrated and discreete GPU handled by i915, will cause us to try and double free the global state, hitting null ptr deref in free_event_attributes. Let's move it to i915_pmu. Fixes: 05488673a4d4 ("drm/i915/pmu: Support multiple GPUs") Signed-off-by: Michał Winiarski Cc: Chris Wilson Cc: Michal Wajdeczko Cc: Tvrtko Ursulin Reviewed-by: Chris Wilson --- drivers/gpu/drm/i915/i915_pmu.c | 41 ++++++++++++++++++--------------- drivers/gpu/drm/i915/i915_pmu.h | 4 ++++ 2 files changed, 26 insertions(+), 19 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_pmu.c b/drivers/gpu/drm/i915/i915_pmu.c index 12f4818c78b8..2c062534eac1 100644 --- a/drivers/gpu/drm/i915/i915_pmu.c +++ b/drivers/gpu/drm/i915/i915_pmu.c @@ -822,11 +822,6 @@ static ssize_t i915_pmu_event_show(struct device *dev, return sprintf(buf, "config=0x%lx\n", eattr->val); } -static struct attribute_group i915_pmu_events_attr_group = { - .name = "events", - /* Patch in attrs at runtime. */ -}; - static ssize_t i915_pmu_get_attr_cpumask(struct device *dev, struct device_attribute *attr, @@ -846,13 +841,6 @@ static const struct attribute_group i915_pmu_cpumask_attr_group = { .attrs = i915_cpumask_attrs, }; -static const struct attribute_group *i915_pmu_attr_groups[] = { - &i915_pmu_format_attr_group, - &i915_pmu_events_attr_group, - &i915_pmu_cpumask_attr_group, - NULL -}; - #define __event(__config, __name, __unit) \ { \ .config = (__config), \ @@ -1026,16 +1014,16 @@ err:; static void free_event_attributes(struct i915_pmu *pmu) { - struct attribute **attr_iter = i915_pmu_events_attr_group.attrs; + struct attribute **attr_iter = pmu->events_attr_group.attrs; for (; *attr_iter; attr_iter++) kfree((*attr_iter)->name); - kfree(i915_pmu_events_attr_group.attrs); + kfree(pmu->events_attr_group.attrs); kfree(pmu->i915_attr); kfree(pmu->pmu_attr); - i915_pmu_events_attr_group.attrs = NULL; + pmu->events_attr_group.attrs = NULL; pmu->i915_attr = NULL; pmu->pmu_attr = NULL; } @@ -1117,6 +1105,13 @@ static bool is_igp(struct drm_i915_private *i915) void i915_pmu_register(struct drm_i915_private *i915) { struct i915_pmu *pmu = &i915->pmu; + const struct attribute_group *attr_groups[] = { + &i915_pmu_format_attr_group, + &pmu->events_attr_group, + &i915_pmu_cpumask_attr_group, + NULL + }; + int ret = -ENOMEM; if (INTEL_GEN(i915) <= 2) { @@ -1143,11 +1138,16 @@ void i915_pmu_register(struct drm_i915_private *i915) if (!pmu->name) goto err; - i915_pmu_events_attr_group.attrs = create_event_attributes(pmu); - if (!i915_pmu_events_attr_group.attrs) + pmu->events_attr_group.name = "events"; + pmu->events_attr_group.attrs = create_event_attributes(pmu); + if (!pmu->events_attr_group.attrs) goto err_name; - pmu->base.attr_groups = i915_pmu_attr_groups; + pmu->base.attr_groups = kmemdup(attr_groups, sizeof(attr_groups), + GFP_KERNEL); + if (!pmu->base.attr_groups) + goto err_attr; + pmu->base.task_ctx_nr = perf_invalid_context; pmu->base.event_init = i915_pmu_event_init; pmu->base.add = i915_pmu_event_add; @@ -1159,7 +1159,7 @@ void i915_pmu_register(struct drm_i915_private *i915) ret = perf_pmu_register(&pmu->base, pmu->name, -1); if (ret) - goto err_attr; + goto err_groups; ret = i915_pmu_register_cpuhp_state(pmu); if (ret) @@ -1169,6 +1169,8 @@ void i915_pmu_register(struct drm_i915_private *i915) err_unreg: perf_pmu_unregister(&pmu->base); +err_groups: + kfree(pmu->base.attr_groups); err_attr: pmu->base.event_init = NULL; free_event_attributes(pmu); @@ -1194,6 +1196,7 @@ void i915_pmu_unregister(struct drm_i915_private *i915) perf_pmu_unregister(&pmu->base); pmu->base.event_init = NULL; + kfree(pmu->base.attr_groups); if (!is_igp(i915)) kfree(pmu->name); free_event_attributes(pmu); diff --git a/drivers/gpu/drm/i915/i915_pmu.h b/drivers/gpu/drm/i915/i915_pmu.h index 207058391cec..f1d6cad0d7d5 100644 --- a/drivers/gpu/drm/i915/i915_pmu.h +++ b/drivers/gpu/drm/i915/i915_pmu.h @@ -107,6 +107,10 @@ struct i915_pmu { * @sleep_last: Last time GT parked for RC6 estimation. */ ktime_t sleep_last; + /** + * @events_attr_group: Device events attribute group. + */ + struct attribute_group events_attr_group; /** * @i915_attr: Memory block holding device attributes. */