From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.6 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5509AC31E40 for ; Tue, 6 Aug 2019 16:06:06 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 2B05320818 for ; Tue, 6 Aug 2019 16:06:06 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="hikw7GF8" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2387591AbfHFQGE (ORCPT ); Tue, 6 Aug 2019 12:06:04 -0400 Received: from bombadil.infradead.org ([198.137.202.133]:43574 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728927AbfHFQGC (ORCPT ); Tue, 6 Aug 2019 12:06:02 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender :Reply-To:Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From :Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id:List-Help: List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=ilF0L5eSgEyyYaXFSbddhy3bpJmKXINzOGRCtzZ9aSI=; b=hikw7GF8n+d60ROTxLBfZvDIvt lWGBz9OAMJ4nVqhoGyF4yYzPEmJ50hwItuCKNXTUScMYDtgdD6ZtVj3qYG7++ZGVk2Q9ltV1R4RHc VqGAKowzDVzvNZ7dsp+tGHAjV0mYw5H5M1cyez5eq1JzrGvXUiS7lApWz9SBQ/bibG532unQjBY13 ObQgADiTMFp8hoPx6SpBkPuWGpWTBCAbirU5kADQ6QscvnjbmbVC0GEWrdHpMovVv26BjA8cMUAt3 tEUUxB/GXyk0FXHu5Z89DXWfkmfju4jCd9ICs/SYWALm/vkEEUwmU+M8iyftX3yZHv5hdll4Qa2Lc j6pVLf9Q==; Received: from [195.167.85.94] (helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.92 #3 (Red Hat Linux)) id 1hv1yI-0000Vj-LP; Tue, 06 Aug 2019 16:05:59 +0000 From: Christoph Hellwig To: =?UTF-8?q?J=C3=A9r=C3=B4me=20Glisse?= , Jason Gunthorpe , Ben Skeggs , Felix Kuehling Cc: Ralph Campbell , linux-mm@kvack.org, nouveau@lists.freedesktop.org, dri-devel@lists.freedesktop.org, amd-gfx@lists.freedesktop.org, linux-kernel@vger.kernel.org Subject: [PATCH 01/15] amdgpu: remove -EAGAIN handling for hmm_range_fault Date: Tue, 6 Aug 2019 19:05:39 +0300 Message-Id: <20190806160554.14046-2-hch@lst.de> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190806160554.14046-1-hch@lst.de> References: <20190806160554.14046-1-hch@lst.de> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org hmm_range_fault can only return -EAGAIN if called with the HMM_FAULT_ALLOW_RETRY flag, which amdgpu never does. Remove the handling for the -EAGAIN case with its non-standard locking scheme. Signed-off-by: Christoph Hellwig Reviewed-by: Jason Gunthorpe Reviewed-by: Felix Kuehling --- drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 23 +++-------------------- 1 file changed, 3 insertions(+), 20 deletions(-) diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c index 12a59ac83f72..f0821638bbc6 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c @@ -778,7 +778,6 @@ int amdgpu_ttm_tt_get_user_pages(struct amdgpu_bo *bo, struct page **pages) struct hmm_range *range; unsigned long i; uint64_t *pfns; - int retry = 0; int r = 0; if (!mm) /* Happens during process shutdown */ @@ -822,7 +821,6 @@ int amdgpu_ttm_tt_get_user_pages(struct amdgpu_bo *bo, struct page **pages) hmm_range_register(range, mirror, start, start + ttm->num_pages * PAGE_SIZE, PAGE_SHIFT); -retry: /* * Just wait for range to be valid, safe to ignore return value as we * will use the return value of hmm_range_fault() below under the @@ -831,24 +829,12 @@ int amdgpu_ttm_tt_get_user_pages(struct amdgpu_bo *bo, struct page **pages) hmm_range_wait_until_valid(range, HMM_RANGE_DEFAULT_TIMEOUT); down_read(&mm->mmap_sem); - r = hmm_range_fault(range, 0); - if (unlikely(r < 0)) { - if (likely(r == -EAGAIN)) { - /* - * return -EAGAIN, mmap_sem is dropped - */ - if (retry++ < MAX_RETRY_HMM_RANGE_FAULT) - goto retry; - else - pr_err("Retry hmm fault too many times\n"); - } - - goto out_up_read; - } - up_read(&mm->mmap_sem); + if (unlikely(r < 0)) + goto out_free_pfns; + for (i = 0; i < ttm->num_pages; i++) { pages[i] = hmm_device_entry_to_page(range, pfns[i]); if (unlikely(!pages[i])) { @@ -864,9 +850,6 @@ int amdgpu_ttm_tt_get_user_pages(struct amdgpu_bo *bo, struct page **pages) return 0; -out_up_read: - if (likely(r != -EAGAIN)) - up_read(&mm->mmap_sem); out_free_pfns: hmm_range_unregister(range); kvfree(pfns); -- 2.20.1