From patchwork Thu Jul 14 12:06:12 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mauro Carvalho Chehab X-Patchwork-Id: 12917764 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 49BFAC433EF for ; Thu, 14 Jul 2022 12:06:34 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 547CD1128B3; Thu, 14 Jul 2022 12:06:33 +0000 (UTC) Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by gabe.freedesktop.org (Postfix) with ESMTPS id 32A6C11298F; Thu, 14 Jul 2022 12:06:32 +0000 (UTC) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 9E6B361E2E; Thu, 14 Jul 2022 12:06:31 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 74C1CC341CA; Thu, 14 Jul 2022 12:06:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1657800390; bh=k6CXTL8ceMAzWtFMfpdGKkaoDa07ImXWLg+e0JE66dg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=pKunhve3qZujvooirtyHbI4zCCgeMc3wzGjIDG0l2qd69h+MvnWTX69mkKVHEdLzi B6kPxxlNHfCi5sTgNFO2DgQ8T38EBTjc/PgHal5yBQY+zT1E/mkXz+bKfowzIFre7r GIe2H26ysSxaThpdPrVHe4yV5+0GNtv2lZ7Ok/eq9m8QYCKwIGWzRfcLY6h4BBrfCh IHoW3Zu7mr2vhef2mnEo7BbtaQ5mOeqblB8+W0dukCX71e8OjX6kRrXiPq0Wk6R3uN DHSsstCOKc2vOkIaxKqoBtiyyrtWMoVA1PyUo+WKa+VZCkqen6BW5LiLtFUwCe9duE /YpkPh1a+WjFg== Received: from mchehab by mail.kernel.org with local (Exim 4.95) (envelope-from ) id 1oBxbv-0059sn-Ts; Thu, 14 Jul 2022 13:06:27 +0100 From: Mauro Carvalho Chehab To: Date: Thu, 14 Jul 2022 13:06:12 +0100 Message-Id: X-Mailer: git-send-email 2.36.1 In-Reply-To: References: MIME-Version: 1.0 Subject: [Intel-gfx] [PATCH v2 07/21] drm/i915/gt: describe the new tlb parameter at i915_vma_resource 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: David Airlie , intel-gfx@lists.freedesktop.org, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, Rodrigo Vivi , Mauro Carvalho Chehab Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" TLB cache invalidation can happen on two different situations: 1. synchronously, at __vma_put_pages(); 2. asynchronously. On the first case, TLB cache invalidation happens inside __vma_put_pages(). So, no need to do it later on. However, on the second case, the pages will keep in memory until __i915_vma_evict() is called. So, we need to store the TLB data at struct i915_vma_resource, in order to do a TLB cache invalidation before allowing userspace to re-use the same memory. So, i915_vma_resource_unbind() has gained a new parameter in order to store the TLB data at the second case. Document it. Signed-off-by: Mauro Carvalho Chehab --- To avoid mailbombing on a large number of people, only mailing lists were C/C on the cover. See [PATCH v2 00/21] at: https://lore.kernel.org/all/cover.1657800199.git.mchehab@kernel.org/ drivers/gpu/drm/i915/i915_vma_resource.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/gpu/drm/i915/i915_vma_resource.c b/drivers/gpu/drm/i915/i915_vma_resource.c index 5a67995ea5fe..4fe09ea0a825 100644 --- a/drivers/gpu/drm/i915/i915_vma_resource.c +++ b/drivers/gpu/drm/i915/i915_vma_resource.c @@ -216,6 +216,10 @@ i915_vma_resource_fence_notify(struct i915_sw_fence *fence, /** * i915_vma_resource_unbind - Unbind a vma resource * @vma_res: The vma resource to unbind. + * @tlb: pointer to vma->obj->mm.tlb associated with the resource + * to be stored at vma_res->tlb. When not-NULL, it will be used + * to do TLB cache invalidation before freeing a VMA resource. + * used only for async unbind. * * At this point this function does little more than publish a fence that * signals immediately unless signaling is held back.