From: "Aneesh Kumar K.V (Arm)" <aneesh.kumar@kernel•org>
To: iommu@lists•linux.dev, linux-arm-kernel@lists•infradead.org,
linux-kernel@vger•kernel.org, linux-coco@lists•linux.dev
Cc: "Aneesh Kumar K.V (Arm)" <aneesh.kumar@kernel•org>,
Robin Murphy <robin.murphy@arm•com>,
Marek Szyprowski <m.szyprowski@samsung•com>,
Will Deacon <will@kernel•org>, Marc Zyngier <maz@kernel•org>,
Steven Price <steven.price@arm•com>,
Suzuki K Poulose <Suzuki.Poulose@arm•com>,
Catalin Marinas <catalin.marinas@arm•com>,
Jiri Pirko <jiri@resnulli•us>, Jason Gunthorpe <jgg@ziepe•ca>,
Mostafa Saleh <smostafa@google•com>,
Petr Tesarik <ptesarik@suse•com>,
Alexey Kardashevskiy <aik@amd•com>,
Dan Williams <dan.j.williams@intel•com>,
Xu Yilun <yilun.xu@linux•intel.com>,
linuxppc-dev@lists•ozlabs.org, linux-s390@vger•kernel.org,
Madhavan Srinivasan <maddy@linux•ibm.com>,
Michael Ellerman <mpe@ellerman•id.au>,
Nicholas Piggin <npiggin@gmail•com>,
"Christophe Leroy (CS GROUP)" <chleroy@kernel•org>,
Alexander Gordeev <agordeev@linux•ibm.com>,
Gerald Schaefer <gerald.schaefer@linux•ibm.com>,
Heiko Carstens <hca@linux•ibm.com>,
Vasily Gorbik <gor@linux•ibm.com>,
Christian Borntraeger <borntraeger@linux•ibm.com>,
Sven Schnelle <svens@linux•ibm.com>,
x86@kernel•org, Jiri Pirko <jiri@nvidia•com>,
Michael Kelley <mhklinux@outlook•com>
Subject: [PATCH v6 07/20] dma-mapping: make dma_pgprot() honor DMA_ATTR_CC_SHARED
Date: Thu, 4 Jun 2026 14:09:46 +0530 [thread overview]
Message-ID: <20260604083959.1265923-8-aneesh.kumar@kernel.org> (raw)
In-Reply-To: <20260604083959.1265923-1-aneesh.kumar@kernel.org>
Fold encrypted/decrypted pgprot selection into dma_pgprot() so callers
do not need to adjust the page protection separately.
Update dma_pgprot() to apply pgprot_decrypted() when
DMA_ATTR_CC_SHARED is set and pgprot_encrypted() otherwise Convert
the dma-direct allocation and mmap paths to pass DMA_ATTR_CC_SHARED
instead of open-coding force_dma_unencrypted() handling around
dma_pgprot().
Tested-by: Jiri Pirko <jiri@nvidia•com>
Tested-by: Michael Kelley <mhklinux@outlook•com>
Tested-by: Mostafa Saleh <smostafa@google•com>
Signed-off-by: Aneesh Kumar K.V (Arm) <aneesh.kumar@kernel•org>
---
kernel/dma/direct.c | 8 +++-----
kernel/dma/mapping.c | 16 ++++++++++++----
2 files changed, 15 insertions(+), 9 deletions(-)
diff --git a/kernel/dma/direct.c b/kernel/dma/direct.c
index 0b4a26c6b6fd..e4cba322386d 100644
--- a/kernel/dma/direct.c
+++ b/kernel/dma/direct.c
@@ -290,9 +290,6 @@ void *dma_direct_alloc(struct device *dev, size_t size,
if (remap) {
pgprot_t prot = dma_pgprot(dev, PAGE_KERNEL, attrs);
- if (force_dma_unencrypted(dev))
- prot = pgprot_decrypted(prot);
-
/* remove any dirty cache lines on the kernel alias */
arch_dma_prep_coherent(page, size);
@@ -614,9 +611,10 @@ int dma_direct_mmap(struct device *dev, struct vm_area_struct *vma,
unsigned long pfn = PHYS_PFN(dma_to_phys(dev, dma_addr));
int ret = -ENXIO;
- vma->vm_page_prot = dma_pgprot(dev, vma->vm_page_prot, attrs);
if (force_dma_unencrypted(dev))
- vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot);
+ attrs |= DMA_ATTR_CC_SHARED;
+
+ vma->vm_page_prot = dma_pgprot(dev, vma->vm_page_prot, attrs);
if (dma_mmap_from_dev_coherent(dev, vma, cpu_addr, size, &ret))
return ret;
diff --git a/kernel/dma/mapping.c b/kernel/dma/mapping.c
index e6b07f160d20..3f4ae283c466 100644
--- a/kernel/dma/mapping.c
+++ b/kernel/dma/mapping.c
@@ -539,13 +539,21 @@ EXPORT_SYMBOL(dma_get_sgtable_attrs);
*/
pgprot_t dma_pgprot(struct device *dev, pgprot_t prot, unsigned long attrs)
{
+ pgprot_t dma_prot;
+
if (dev_is_dma_coherent(dev))
- return prot;
+ dma_prot = prot;
#ifdef CONFIG_ARCH_HAS_DMA_WRITE_COMBINE
- if (attrs & DMA_ATTR_WRITE_COMBINE)
- return pgprot_writecombine(prot);
+ else if (attrs & DMA_ATTR_WRITE_COMBINE)
+ dma_prot = pgprot_writecombine(prot);
#endif
- return pgprot_dmacoherent(prot);
+ else
+ dma_prot = pgprot_dmacoherent(prot);
+
+ if (attrs & DMA_ATTR_CC_SHARED)
+ return pgprot_decrypted(dma_prot);
+ else
+ return pgprot_encrypted(dma_prot);
}
#endif /* CONFIG_MMU */
--
2.43.0
next prev parent reply other threads:[~2026-06-04 8:41 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-06-04 8:39 [PATCH v6 00/20] dma-mapping: Use DMA_ATTR_CC_SHARED through direct, pool and swiotlb paths Aneesh Kumar K.V (Arm)
2026-06-04 8:39 ` [PATCH v6 01/20] s390: Expose protected virtualization through cc_platform_has() Aneesh Kumar K.V (Arm)
2026-06-04 8:39 ` [PATCH v6 02/20] dma-direct: swiotlb: handle swiotlb alloc/free outside __dma_direct_alloc_pages Aneesh Kumar K.V (Arm)
2026-06-04 8:39 ` [PATCH v6 03/20] dma-direct: use DMA_ATTR_CC_SHARED in alloc/free paths Aneesh Kumar K.V (Arm)
2026-06-04 8:39 ` [PATCH v6 04/20] dma-pool: track decrypted atomic pools and select them via attrs Aneesh Kumar K.V (Arm)
2026-06-04 8:39 ` [PATCH v6 05/20] dma: swiotlb: pass mapping attributes by reference Aneesh Kumar K.V (Arm)
2026-06-04 8:39 ` [PATCH v6 06/20] dma: swiotlb: track pool encryption state and honor DMA_ATTR_CC_SHARED Aneesh Kumar K.V (Arm)
2026-06-04 8:39 ` Aneesh Kumar K.V (Arm) [this message]
2026-06-04 8:39 ` [PATCH v6 08/20] dma-direct: pass attrs to dma_capable() for DMA_ATTR_CC_SHARED checks Aneesh Kumar K.V (Arm)
2026-06-04 8:39 ` [PATCH v6 09/20] dma-direct: make dma_direct_map_phys() honor DMA_ATTR_CC_SHARED Aneesh Kumar K.V (Arm)
2026-06-04 8:39 ` [PATCH v6 10/20] dma-direct: set decrypted flag for remapped DMA allocations Aneesh Kumar K.V (Arm)
2026-06-04 8:39 ` [PATCH v6 11/20] dma-direct: select DMA address encoding from DMA_ATTR_CC_SHARED Aneesh Kumar K.V (Arm)
2026-06-04 8:39 ` [PATCH v6 12/20] dma-pool: fix page leak in atomic_pool_expand() cleanup Aneesh Kumar K.V (Arm)
2026-06-04 8:39 ` [PATCH v6 13/20] dma-direct: rename ret to cpu_addr in alloc helpers Aneesh Kumar K.V (Arm)
2026-06-04 8:39 ` [PATCH v6 14/20] dma-direct: return struct page from dma_direct_alloc_from_pool() Aneesh Kumar K.V (Arm)
2026-06-04 8:39 ` [PATCH v6 15/20] iommu/dma: Check atomic pool allocation result directly Aneesh Kumar K.V (Arm)
2026-06-04 8:39 ` [PATCH v6 16/20] dma: swiotlb: free dynamic pools from process context Aneesh Kumar K.V (Arm)
2026-06-04 8:39 ` [PATCH v6 17/20] dma: swiotlb: handle set_memory_decrypted() failures Aneesh Kumar K.V (Arm)
2026-06-04 8:39 ` [PATCH v6 18/20] dma: free atomic pool pages by physical address Aneesh Kumar K.V (Arm)
2026-06-04 8:39 ` [PATCH v6 19/20] swiotlb: Preserve allocation virtual address for dynamic pools Aneesh Kumar K.V (Arm)
2026-06-04 8:39 ` [PATCH v6 20/20] swiotlb: remove unused SWIOTLB_FORCE flag Aneesh Kumar K.V (Arm)
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20260604083959.1265923-8-aneesh.kumar@kernel.org \
--to=aneesh.kumar@kernel$(echo .)org \
--cc=Suzuki.Poulose@arm$(echo .)com \
--cc=agordeev@linux$(echo .)ibm.com \
--cc=aik@amd$(echo .)com \
--cc=borntraeger@linux$(echo .)ibm.com \
--cc=catalin.marinas@arm$(echo .)com \
--cc=chleroy@kernel$(echo .)org \
--cc=dan.j.williams@intel$(echo .)com \
--cc=gerald.schaefer@linux$(echo .)ibm.com \
--cc=gor@linux$(echo .)ibm.com \
--cc=hca@linux$(echo .)ibm.com \
--cc=iommu@lists$(echo .)linux.dev \
--cc=jgg@ziepe$(echo .)ca \
--cc=jiri@nvidia$(echo .)com \
--cc=jiri@resnulli$(echo .)us \
--cc=linux-arm-kernel@lists$(echo .)infradead.org \
--cc=linux-coco@lists$(echo .)linux.dev \
--cc=linux-kernel@vger$(echo .)kernel.org \
--cc=linux-s390@vger$(echo .)kernel.org \
--cc=linuxppc-dev@lists$(echo .)ozlabs.org \
--cc=m.szyprowski@samsung$(echo .)com \
--cc=maddy@linux$(echo .)ibm.com \
--cc=maz@kernel$(echo .)org \
--cc=mhklinux@outlook$(echo .)com \
--cc=mpe@ellerman$(echo .)id.au \
--cc=npiggin@gmail$(echo .)com \
--cc=ptesarik@suse$(echo .)com \
--cc=robin.murphy@arm$(echo .)com \
--cc=smostafa@google$(echo .)com \
--cc=steven.price@arm$(echo .)com \
--cc=svens@linux$(echo .)ibm.com \
--cc=will@kernel$(echo .)org \
--cc=x86@kernel$(echo .)org \
--cc=yilun.xu@linux$(echo .)intel.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox