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 4C03846AA62; Mon, 17 Aug 2026 17:22:31 +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=1786987351; cv=none; b=ikIzB3MaNOgaEEmCQTU4z+t+uqGj2134a98ZVqnGbGD2MTxKRkb1O2V0myNmtrGY6S8shefU3+YsbuzxRXFhME2ZPFD/I/F4k0qnRfpz+vG+QSn4xivjq81MsORKiYYsSwjSvmJrXOfU9veUiqhg8uMSZEu11zqKtdj3poCnGXU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786987351; c=relaxed/simple; bh=kuEHwBXtGwctLu6qKXdhOx+wx0UojFjK0d0zFur0xrI=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=Z4mVwRraJ7w/B36jWQrzWK201LBz+pcxUDaO02UPAzdi5/wMi2iumC94Vnuz6wvoCikt/FMifkE6wmBPf+tWhLge/Zifw02FNtd3zOTV0SDL8C2Yem8THL/3GQCIaxfMsZ/p5H9VHrG1e1UuyBkT3l9Ou3FEeyR+uuXdR9AojJA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=kG43H0jB; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="kG43H0jB" Received: by smtp.kernel.org (Postfix) with ESMTPS id 1D4A9C2BD04; Mon, 17 Aug 2026 17:22:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1786987351; bh=kuEHwBXtGwctLu6qKXdhOx+wx0UojFjK0d0zFur0xrI=; h=From:Date:Subject:References:In-Reply-To:To:Cc:Reply-To:From; b=kG43H0jBu0rVsrd1NgkPvUPGMVMYK1kcKXsqFvXQLFPW25EqEaT4L8YJtveEm67Xp xC2Eo58kMX6Xkx0/UTlExtNVLTnnDeS7WAheSzyLL2lYCwJ6gkfBLmDDmMlX70yQ/h 5j2WkCHzpipz91qd/luctZvN68eIOKYZ/+nl3PYMicNksHUsDxpxIcCt72EqAuE113 uSbjPK0MfO5S1+wbLj5kwrYh72yXDi+OgaEZ/I8oBGhrtc4ExYRjMSb1QycWxONZOh Btzx7BoGq3Xq7JiAoNB73R5znsZd6vQwAYUuYUZerPMkj6dgBlKV4B/Hp4XlUyt0n+ ztyybcMMTRNxA== Received: from aws-us-west-2-korg-lkml-1.web.codeaurora.org (localhost.localdomain [127.0.0.1]) by smtp.lore.kernel.org (Postfix) with ESMTP id F0E31C5DF66; Mon, 17 Aug 2026 17:22:30 +0000 (UTC) From: Jim Cromie via B4 Relay Date: Mon, 17 Aug 2026 11:22:18 -0600 Subject: [PATCH 4/9] drm/gpuvm: Route gpuva_op allocations to folio_scratchpad Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260817-folio-pool-v1-v1-4-0c1d230aa3af@gmail.com> References: <20260817-folio-pool-v1-v1-0-0c1d230aa3af@gmail.com> In-Reply-To: <20260817-folio-pool-v1-v1-0-0c1d230aa3af@gmail.com> To: Andrew Morton , Pablo Neira Ayuso , Florian Westphal , Phil Sutter , Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Eduard Zingerman , Danilo Krummrich , Matthew Brost , Boris Brezillon , Peter Zijlstra , Ingo Molnar , Will Deacon , Waiman Long , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Simon Horman , Kumar Kartikeya Dwivedi , Martin KaFai Lau , Song Liu , Yonghong Song , Jiri Olsa , Emil Tsalapatis , John Fastabend , =?utf-8?q?Thomas_Hellstr=C3=B6m?= , Alice Ryhl , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Boqun Feng , Boqun Feng Cc: netfilter-devel@vger.kernel.org, bpf@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, coreteam@netfilter.org, netdev@vger.kernel.org, Jim Cromie X-Mailer: b4 0.14.3 X-Developer-Signature: v=1; a=ed25519-sha256; t=1786987349; l=2727; i=jim.cromie@gmail.com; s=20260203; h=from:subject:message-id; bh=hfnn2JXUUX2MnAJuI+XocbzOzt9nFPPM4gsyoKFfaV8=; b=tOf7FwZgeFhwjRf2P61V+1ciBVYTcBIRJ4/DWzCwZDYpfrvSen9nBPACUBxDKUMeVVJ8v4CaP mkzXUqlmIs3DYZ8/WvkgAQUjjUavZdG8d4TJsDC7vinDqpN8OckRK7E X-Developer-Key: i=jim.cromie@gmail.com; a=ed25519; pk=C6E5ODlPQo7ZBynATXH9wg7K6HxP0pIXyf4s38Qw0XE= X-Endpoint-Received: by B4 Relay for jim.cromie@gmail.com/20260203 with auth_id=958 X-Original-From: Jim Cromie Reply-To: jim.cromie@gmail.com From: Jim Cromie Embed a struct folio_scratchpad inside struct drm_gpuvm and route default gpuva_op allocations in gpuva_op_alloc() to folio_scratchpad_alloc_obj(), with O(1) bulk teardown in drm_gpuvm_fini(). Signed-off-by: Jim Cromie --- drivers/gpu/drm/drm_gpuvm.c | 11 +++++++++-- include/drm/drm_gpuvm.h | 6 ++++++ 2 files changed, 15 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/drm_gpuvm.c b/drivers/gpu/drm/drm_gpuvm.c index c422c5af1f4b..6bb82ac9e2d6 100644 --- a/drivers/gpu/drm/drm_gpuvm.c +++ b/drivers/gpu/drm/drm_gpuvm.c @@ -1109,6 +1109,8 @@ drm_gpuvm_init(struct drm_gpuvm *gpuvm, const char *name, spin_lock_init(&gpuvm->evict.lock); init_llist_head(&gpuvm->bo_defer); + folio_scratchpad_init_key(&gpuvm->va_scratchpad, get_order(SZ_64K), + &gpuvm_scratchpad_key); kref_init(&gpuvm->kref); @@ -1155,6 +1157,7 @@ drm_gpuvm_fini(struct drm_gpuvm *gpuvm) drm_WARN(gpuvm->drm, !llist_empty(&gpuvm->bo_defer), "VM BO cleanup list should be empty.\n"); + folio_scratchpad_free(&gpuvm->va_scratchpad); drm_gem_object_put(gpuvm->r_obj); } @@ -2849,6 +2852,9 @@ drm_gpuvm_sm_unmap_exec_lock(struct drm_gpuvm *gpuvm, struct drm_exec *exec, } EXPORT_SYMBOL_GPL(drm_gpuvm_sm_unmap_exec_lock); +DEFINE_FOLIO_POOL_STATIC_KEY_PARAM(gpuvm_scratchpad_key, va_scratchpad, + "Toggle DRM GPUVM range folio scratchpad allocator"); + static struct drm_gpuva_op * gpuva_op_alloc(struct drm_gpuvm *gpuvm) { @@ -2858,7 +2864,8 @@ gpuva_op_alloc(struct drm_gpuvm *gpuvm) if (fn && fn->op_alloc) op = fn->op_alloc(); else - op = kzalloc_obj(*op); + op = folio_scratchpad_alloc_obj(gpuvm, va_scratchpad, + struct drm_gpuva_op, GFP_KERNEL); if (unlikely(!op)) return NULL; @@ -2875,7 +2882,7 @@ gpuva_op_free(struct drm_gpuvm *gpuvm, if (fn && fn->op_free) fn->op_free(op); else - kfree(op); + folio_scratchpad_free_elem(op); } static int diff --git a/include/drm/drm_gpuvm.h b/include/drm/drm_gpuvm.h index 655bd9104ffb..362b1d88d30d 100644 --- a/include/drm/drm_gpuvm.h +++ b/include/drm/drm_gpuvm.h @@ -30,6 +30,7 @@ #include #include #include +#include #include #include @@ -338,6 +339,11 @@ struct drm_gpuvm { * @bo_defer: structure holding vm_bos that need to be destroyed */ struct llist_head bo_defer; + + /** + * @va_scratchpad: folio scratchpad for transient GPU VA range allocations + */ + struct folio_scratchpad va_scratchpad; }; void drm_gpuvm_init(struct drm_gpuvm *gpuvm, const char *name, -- 2.55.0