From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pf1-f201.google.com (mail-pf1-f201.google.com [209.85.210.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7AEDC39D6F6 for ; Wed, 8 Jul 2026 23:48:57 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783554538; cv=none; b=Oe3Obfyt/47VLtCnj6QKj2zSO5MahXW2iHL/CR87+mrBN4qQZz1Eq4lnPhWMjI8VH67AAl0VfQG75OS7msS5rRkeEXhrjwNav0qoS0AwPLI4ZKGN6d9h2GNtJpizto+GzSfKqPzi21RZRuXWTUe9e+5dseJ1KjrFncHh2LBvEsg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783554538; c=relaxed/simple; bh=6jssrHCaxHvaqzW+be+ADSb76OVb/YAMVKCPjnMUMhQ=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=vB6HKerT6muBauDbetBZ/NDg2dqyIYh/lKzXNA6A0Zel6oS8+JKVAUw/u1YUk9FfvAJiM3/1vqJT0aCEpAuLDi1eHqTiYgOpcvCHkMk436k5ecJO15jps7kl+h9iDD++nf+egfsy3v8wetzrKjiThT15G2sobsQdf5+KWsgRWgk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--skhawaja.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=lL5jUlMA; arc=none smtp.client-ip=209.85.210.201 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--skhawaja.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="lL5jUlMA" Received: by mail-pf1-f201.google.com with SMTP id d2e1a72fcca58-84859a64079so243996b3a.3 for ; Wed, 08 Jul 2026 16:48:57 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20251104; t=1783554537; x=1784159337; darn=vger.kernel.org; h=content-type:cc:to:from:subject:message-id:references:mime-version :in-reply-to:date:from:to:cc:subject:date:message-id:reply-to :content-type; bh=aFhl1KlUjTv27006fhIt6b3pOPGmn7+PIUCxNMQiXPw=; b=lL5jUlMA04Ze0XwLCUVih2j/WS7DJwkXLczMf2AMtYRLmojB8rdWyqGT3H+dOF5Ja9 yjOvpTq/sSt1CjQiEMxskNe0wkki+O4XAuJiea1jYj/SnwuBJUwa2m6uH+NHQwkz9aJ4 1XTKiGzamGktaMyfFZbPNTqaEjsSloGSt0TDO0xFca/vnAfkFiZz9/7wzprG10xxJKYQ PlgRsZbDkcsAxEdztdRSHNTwyrBNCHkc+2vcz6IiAYxSw3UfKmVLqdRiyE7HUlmIzo7o yLho/EExwRAMa8/Y/1vGTyN7w29Wkj6CV9Giv9TUi91ijrH9XXfhFqBuAimh85J0BNkt cZIg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1783554537; x=1784159337; h=content-type:cc:to:from:subject:message-id:references:mime-version :in-reply-to:date:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to:content-type; bh=aFhl1KlUjTv27006fhIt6b3pOPGmn7+PIUCxNMQiXPw=; b=daZqmk6CY/DR5w7TMwayvAZlZH5Rkl4Em6aIVyUTFOGNMXzA3G10wwLR48wq+fKfDb ssDVTEYJIhF9wk1xhmrkIDGwhGgwj4FGE9Io+tY4v2ZO0r+Zzuqv+eThVTwaUCeONopE Y5Png/j1GZp2x2THY9ZL3DXIQX3daV1EhLRWvtF4DHHuANTUpxp/HBVj5rq4QaDLDUcT g30wg7OcTCL4yu5qCNqR5hA4pnkL/6npsiPV2X+yHSu52zp9a7XQoRgB1sAA1YMhaTSf 2ukk44sfuRkBFv5UN44usBBuXHQu7hJAVo7t/nBe8PWtRaUxIuO08uUQwMa1ztp42Bq6 zOfA== X-Forwarded-Encrypted: i=1; AHgh+RrupMsnY74QigpfKkFh2tH+jsPBhXRz2+L2p/P2/KsDXUZEZ0j2Fs8DN/EvakA7GVbinP8iJiUcUGBis88=@vger.kernel.org X-Gm-Message-State: AOJu0YxGcdSlIZyskuSgMsHEdCIcWakW4pxIXexgFfT0I6NnWR7OMnhv 4MU6wDQB1qwm8q1UcJQ8hGEymcbwwcwfE/tfl+JPfg0yINqAb+Qb13Sg9FW5qpgwrBlmyBXvBbs ohM8Q4yFqNNItxQ== X-Received: from pfcp8.prod.google.com ([2002:a05:6a00:a248:b0:848:4e44:7f19]) (user=skhawaja job=prod-delivery.src-stubby-dispatcher) by 2002:a05:6a00:3e12:b0:848:411f:3969 with SMTP id d2e1a72fcca58-84842ee66f7mr4071344b3a.20.1783554536532; Wed, 08 Jul 2026 16:48:56 -0700 (PDT) Date: Wed, 8 Jul 2026 23:48:46 +0000 In-Reply-To: <20260708234854.4044652-1-skhawaja@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20260708234854.4044652-1-skhawaja@google.com> X-Mailer: git-send-email 2.55.0.795.g602f6c329a-goog Message-ID: <20260708234854.4044652-3-skhawaja@google.com> Subject: [RFC PATCH v2 02/10] dma/pool: Add an API to check if DMA allocation is from pool From: Samiullah Khawaja To: Marek Szyprowski , Will Deacon , Jason Gunthorpe Cc: Samiullah Khawaja , Pasha Tatashin , Mike Rapoport , Pratyush Yadav , Alexander Graf , Robin Murphy , Kevin Tian , iommu@lists.linux.dev, kexec@lists.infradead.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, David Matlack , Andrew Morton , Pranjal Shrivastava , Vipin Sharma Content-Type: text/plain; charset="UTF-8" DMA allocations can be done through DMA pools, add an API that can be used to check if an allocation is done from a pool. This will be used in the later commit during preservation of DMA allocation. Signed-off-by: Samiullah Khawaja --- include/linux/dma-map-ops.h | 1 + kernel/dma/pool.c | 13 +++++++++++++ 2 files changed, 14 insertions(+) diff --git a/include/linux/dma-map-ops.h b/include/linux/dma-map-ops.h index 6a1832a73cad..9382785a2faa 100644 --- a/include/linux/dma-map-ops.h +++ b/include/linux/dma-map-ops.h @@ -216,6 +216,7 @@ struct page *dma_alloc_from_pool(struct device *dev, size_t size, bool (*phys_addr_ok)(struct device *, phys_addr_t, size_t)); bool dma_free_from_pool(struct device *dev, void *start, size_t size); +bool dma_is_from_pool(void *start, size_t size); int dma_direct_set_offset(struct device *dev, phys_addr_t cpu_start, dma_addr_t dma_start, u64 size); diff --git a/kernel/dma/pool.c b/kernel/dma/pool.c index 2b2fbb709242..d1a0bb03e478 100644 --- a/kernel/dma/pool.c +++ b/kernel/dma/pool.c @@ -307,3 +307,16 @@ bool dma_free_from_pool(struct device *dev, void *start, size_t size) return false; } + +bool dma_is_from_pool(void *start, size_t size) +{ + struct gen_pool *pool = NULL; + + while ((pool = dma_guess_pool(pool, 0))) { + if (!gen_pool_has_addr(pool, (unsigned long)start, size)) + continue; + return true; + } + + return false; +} -- 2.55.0.795.g602f6c329a-goog