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 034283AB5DE for ; Wed, 8 Jul 2026 23:48:59 +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=1783554540; cv=none; b=Z+q7eGdEnjEBwdYxTr4IbRhnV5+TK9GnfIilJa+a/4EQjrKZ8PFxyMCQIwEz7WWdZoju7LSSLD7whydsZbFhySmyFugWeFu7XGj2Z+8OEuuDjmA1J8h/nf1vL6NTzQFP491/rEfEbuUjUOfCBwFz0He7ID5HWLs7NjdDZ+9ufP4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783554540; c=relaxed/simple; bh=8pgB2+m6zQDsdm8l3FJG7AwY8SkJeC+684RsRAZ8ZUI=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=WoZKjhTp58+xm9KY0qIk70StMun0aaK8aR+C3aCMkOLEJvtPECO5z51vGI14MvCpuhDMbAdWrOvbB2Tue7FXT3wzDQXvVVHMFq5uPaMAwGuvGb7O7fVaCUBSPpqTk8sOQnVXpFD+oD74FofQvpToT33VqEH/I+Xftkncn3PMJ3Q= 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=OeLwh3kg; 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="OeLwh3kg" Received: by mail-pf1-f201.google.com with SMTP id d2e1a72fcca58-848544a8496so490081b3a.0 for ; Wed, 08 Jul 2026 16:48:59 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20251104; t=1783554538; x=1784159338; 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=RZBzRoXH7VF0ByV3qQDpFWW6MWj2hI4S3QQKMPJnM4U=; b=OeLwh3kgiNt8Hw9CVvLUdK31yUmliUeDzLZ4HnfwyoTaECRvTTEh3xZo3MrJgj474h /A2DYeTJmghxMcwdN1f7/BqPWbCwHBUAG0tQqtxeQEEycG8SSknVbbpkpmIqvNWowir7 4JrhTHzAkts1zLP+tmMnRS6QQsbwdP6eNZqdBzHnDUNeSBFncTpOGkYRn/AicQKidyX7 djj2xUg+2DuWEpuO+rob5dJbtmLaLr80iD/zdazNrBbck8C6NX9ZnyL1lxDhSCAezE/U K8G2nOmKC2BsetXVLE0lnhjuUM2ZEyVbyCP8ms+s2DGEWO8aM2tvqjaV5495+eHCTzME xg4Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1783554538; x=1784159338; 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=RZBzRoXH7VF0ByV3qQDpFWW6MWj2hI4S3QQKMPJnM4U=; b=ZLcYLKvC0R4BC1lv+23nPD1GEeom7hRFYRfH3blyQ60Uc4QdUEletsjmpmLtJRSOsu bjNjYl2zdT5y6QUZS4Z2LrcatC2Gqq8vei6irftADnepZbbWdadnmIq7FHoWvZM6KDsI TTKYlUkMOh8P8Nz3Et75FASwM4wxymuKaimDZhv4TQvqo/s2uqvxeDP47XHwF7gYbkBx Hc02FJ14QZR4rqJ7nwSjsIpvbZ3xy8WNKuU3nQRLd8RIPzKH/N93ZrerSW6i5UsQd+mx jsSCMG4AYwSUJ/SEg+LKIy0YEW6baWO+ItN6bQGyuAIbMg7I+8LsvdMFfYaggXU4vjfc h1Pw== X-Forwarded-Encrypted: i=1; AHgh+RpsD9GeVyg4n9w9OfSEA6Xl5DcH6qGI3cb+DUpUzcPb7g2wflBkGNC+2m3Vp6HXiNLdwJt9CrR1QftBHxc=@vger.kernel.org X-Gm-Message-State: AOJu0YzcO3Emp6vqRPiNis9LIJ1vunuCaDcFEky47B7xMZVAlg5OOMgE mxloOtleGsdjUx8JI/mnDVmg86tfF2V6VIfpi/EJk2z2OoRU/7ATQG71QlPoY8C3KZkFC4bR8Ug sZt+2lzHc5my/SA== X-Received: from pfbhh2.prod.google.com ([2002:a05:6a00:8682:b0:845:4da8:56a5]) (user=skhawaja job=prod-delivery.src-stubby-dispatcher) by 2002:a05:6a00:805:b0:848:3f83:de9b with SMTP id d2e1a72fcca58-84842fe47bcmr4585485b3a.9.1783554538155; Wed, 08 Jul 2026 16:48:58 -0700 (PDT) Date: Wed, 8 Jul 2026 23:48:48 +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: <20260708234854.4044652-5-skhawaja@google.com> Subject: [RFC PATCH v2 04/10] dma-coherent: Allow checking if allocation is from dev coherent region 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" Add an API that allows if a DMA allocation is from device coherent region. Signed-off-by: Samiullah Khawaja --- include/linux/dma-map-ops.h | 3 +++ kernel/dma/coherent.c | 11 +++++++++++ 2 files changed, 14 insertions(+) diff --git a/include/linux/dma-map-ops.h b/include/linux/dma-map-ops.h index 9b91c839ceb5..b13e5eebe6d3 100644 --- a/include/linux/dma-map-ops.h +++ b/include/linux/dma-map-ops.h @@ -162,6 +162,7 @@ int dma_alloc_from_dev_coherent(struct device *dev, ssize_t size, int dma_release_from_dev_coherent(struct device *dev, int order, void *vaddr); int dma_mmap_from_dev_coherent(struct device *dev, struct vm_area_struct *vma, void *cpu_addr, size_t size, int *ret); +bool dma_is_from_dev_coherent(struct device *dev, void *vaddr); #else static inline int dma_declare_coherent_memory(struct device *dev, phys_addr_t phys_addr, dma_addr_t device_addr, size_t size) @@ -172,6 +173,8 @@ static inline int dma_declare_coherent_memory(struct device *dev, #define dma_alloc_from_dev_coherent(dev, size, handle, ret) (0) #define dma_release_from_dev_coherent(dev, order, vaddr) (0) #define dma_mmap_from_dev_coherent(dev, vma, vaddr, order, ret) (0) +#define dma_is_from_dev_coherent(dev, vaddr) (false) + static inline void dma_release_coherent_memory(struct device *dev) { } #endif /* CONFIG_DMA_DECLARE_COHERENT */ diff --git a/kernel/dma/coherent.c b/kernel/dma/coherent.c index bcdc0f76d2e8..76cbe11e1f90 100644 --- a/kernel/dma/coherent.c +++ b/kernel/dma/coherent.c @@ -231,6 +231,17 @@ int dma_release_from_dev_coherent(struct device *dev, int order, void *vaddr) return __dma_release_from_coherent(mem, order, vaddr); } +bool dma_is_from_dev_coherent(struct device *dev, void *vaddr) +{ + struct dma_coherent_mem *mem = dev_get_coherent_memory(dev); + + if (mem && vaddr >= mem->virt_base && vaddr < + (mem->virt_base + ((dma_addr_t)mem->size << PAGE_SHIFT))) + return true; + + return false; +} + static int __dma_mmap_from_coherent(struct dma_coherent_mem *mem, struct vm_area_struct *vma, void *vaddr, size_t size, int *ret) { -- 2.55.0.795.g602f6c329a-goog