From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B3EBC70831; Tue, 27 May 2025 17:08:16 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1748365696; cv=none; b=GNJjqg3/dwqPLYmdC7rhDRsw+mmthL4cIJVPALYDVp285YsrPDRNoPey+BdhnpO5+JAjC42ouEd/uWl8Z4MSa3whRj/p4oRK+W+E+OnZB6jJ6Uk2qTToZ+2UVuhAy4NqQwrO7puZcb2NZIiVHql1I00FC7rmbT53jza1cHNrCOg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1748365696; c=relaxed/simple; bh=5cxAnxt5UFRwcttP1ondzIKINAZmHE2KgEQVFh7fK6w=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=ng5gKHrf5GTwRR6647+tmDW9JPHw3azeFmU6Y9zdZdVIqZyTFSXxyXUgU+HKC8Rc1kX8VptCNYeJP9BV7O2mufpHgQuoVQ0Nr0U9pnTafwgAeIIhLEv0PD3DYJSIt5o5W5kUtJXR9zoLs9RCbfgSps60jTzCOwfDNFuKOwCv02o= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=Okt6yJzb; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="Okt6yJzb" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 15E35C4CEE9; Tue, 27 May 2025 17:08:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1748365696; bh=5cxAnxt5UFRwcttP1ondzIKINAZmHE2KgEQVFh7fK6w=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Okt6yJzb7v99zBCggBb/9Q9Bel8JWlyeO6lGs1Uq0Cc1iLxbDA44k57BZs7KMXZJ2 tps/jyQCTgNzwCRQCauqYKjZhy3Ja8w1ifcSyeXgg6vg6Gr5j22HMA1EGgRPla5U/k TMUzrjPBHWr6fBh06mb77CSU+MSRmbdkcSewIW0Q= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Michal Wajdeczko , Marcin Bernatowicz , Sasha Levin Subject: [PATCH 6.12 460/626] drm/xe/relay: Dont use GFP_KERNEL for new transactions Date: Tue, 27 May 2025 18:25:53 +0200 Message-ID: <20250527162503.684741332@linuxfoundation.org> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20250527162445.028718347@linuxfoundation.org> References: <20250527162445.028718347@linuxfoundation.org> User-Agent: quilt/0.68 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.12-stable review patch. If anyone has any objections, please let me know. ------------------ From: Michal Wajdeczko [ Upstream commit 78d5d1e20d1de9422f013338a0f2311448588ba7 ] VFs use a relay transaction during the resume/reset flow and use of the GFP_KERNEL flag may conflict with the reclaim: -> #0 (fs_reclaim){+.+.}-{0:0}: [ ] __lock_acquire+0x1874/0x2bc0 [ ] lock_acquire+0xd2/0x310 [ ] fs_reclaim_acquire+0xc5/0x100 [ ] mempool_alloc_noprof+0x5c/0x1b0 [ ] __relay_get_transaction+0xdc/0xa10 [xe] [ ] relay_send_to+0x251/0xe50 [xe] [ ] xe_guc_relay_send_to_pf+0x79/0x3a0 [xe] [ ] xe_gt_sriov_vf_connect+0x90/0x4d0 [xe] [ ] xe_uc_init_hw+0x157/0x3b0 [xe] [ ] do_gt_restart+0x1ae/0x650 [xe] [ ] xe_gt_resume+0xb6/0x120 [xe] [ ] xe_pm_runtime_resume+0x15b/0x370 [xe] [ ] xe_pci_runtime_resume+0x73/0x90 [xe] [ ] pci_pm_runtime_resume+0xa0/0x100 [ ] __rpm_callback+0x4d/0x170 [ ] rpm_callback+0x64/0x70 [ ] rpm_resume+0x594/0x790 [ ] __pm_runtime_resume+0x4e/0x90 [ ] xe_pm_runtime_get_ioctl+0x9c/0x160 [xe] Since we have a preallocated pool of relay transactions, which should cover all our normal relay use cases, we may use the GFP_NOWAIT flag when allocating new outgoing transactions. Signed-off-by: Michal Wajdeczko Tested-by: Marcin Bernatowicz Reviewed-by: Marcin Bernatowicz Link: https://patchwork.freedesktop.org/patch/msgid/20250131153713.808-1-michal.wajdeczko@intel.com Signed-off-by: Sasha Levin --- drivers/gpu/drm/xe/xe_guc_relay.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/gpu/drm/xe/xe_guc_relay.c b/drivers/gpu/drm/xe/xe_guc_relay.c index ade6162dc2598..0e5b43e1518ea 100644 --- a/drivers/gpu/drm/xe/xe_guc_relay.c +++ b/drivers/gpu/drm/xe/xe_guc_relay.c @@ -224,7 +224,7 @@ __relay_get_transaction(struct xe_guc_relay *relay, bool incoming, u32 remote, u * with CTB lock held which is marked as used in the reclaim path. * Btw, that's one of the reason why we use mempool here! */ - txn = mempool_alloc(&relay->pool, incoming ? GFP_ATOMIC : GFP_KERNEL); + txn = mempool_alloc(&relay->pool, incoming ? GFP_ATOMIC : GFP_NOWAIT); if (!txn) return ERR_PTR(-ENOMEM); -- 2.39.5