linux-kernel - [RFC v2 04/21] dma-mapping: initialize IOVA state struct

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Message-ID: <cae6ddc4bad0045919758ae3a65f98ef84f6406d.1726138681.git.leon@kernel.org>
Date: Thu, 12 Sep 2024 14:15:39 +0300
From: Leon Romanovsky <leon@...nel.org>
To: Jens Axboe <axboe@...nel.dk>,
	Jason Gunthorpe <jgg@...pe.ca>,
	Robin Murphy <robin.murphy@....com>,
	Joerg Roedel <joro@...tes.org>,
	Will Deacon <will@...nel.org>,
	Keith Busch <kbusch@...nel.org>,
	Christoph Hellwig <hch@....de>,
	"Zeng, Oak" <oak.zeng@...el.com>,
	Chaitanya Kulkarni <kch@...dia.com>
Cc: Leon Romanovsky <leonro@...dia.com>,
	Sagi Grimberg <sagi@...mberg.me>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Logan Gunthorpe <logang@...tatee.com>,
	Yishai Hadas <yishaih@...dia.com>,
	Shameer Kolothum <shameerali.kolothum.thodi@...wei.com>,
	Kevin Tian <kevin.tian@...el.com>,
	Alex Williamson <alex.williamson@...hat.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Jérôme Glisse <jglisse@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-block@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-rdma@...r.kernel.org,
	iommu@...ts.linux.dev,
	linux-nvme@...ts.infradead.org,
	linux-pci@...r.kernel.org,
	kvm@...r.kernel.org,
	linux-mm@...ck.org
Subject: [RFC v2 04/21] dma-mapping: initialize IOVA state struct

From: Leon Romanovsky <leonro@...dia.com>

Allow callers to properly initialize the IOVA state struct by providing
a new function to do so. This will make sure that even users who doesn't
zero their allocated memory will have a valid IOVA state struct.

Signed-off-by: Leon Romanovsky <leonro@...dia.com>
---
 include/linux/dma-mapping.h | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h
index f693aafe221f..285075873077 100644
--- a/include/linux/dma-mapping.h
+++ b/include/linux/dma-mapping.h
@@ -76,6 +76,20 @@
 
 #define DMA_BIT_MASK(n)	(((n) == 64) ? ~0ULL : ((1ULL<<(n))-1))
 
+struct dma_iova_state {
+	struct device *dev;
+	enum dma_data_direction dir;
+};
+
+static inline void dma_init_iova_state(struct dma_iova_state *state,
+				       struct device *dev,
+				       enum dma_data_direction dir)
+{
+	memset(state, 0, sizeof(*state));
+	state->dev = dev;
+	state->dir = dir;
+}
+
 #ifdef CONFIG_DMA_API_DEBUG
 void debug_dma_mapping_error(struct device *dev, dma_addr_t dma_addr);
 void debug_dma_map_single(struct device *dev, const void *addr,
-- 
2.46.0