From: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
To: hch@lst.de, Robin Murphy <robin.murphy@arm.com>,
David Rientjes <rientjes@google.com>,
iommu@lists.linux-foundation.org,
Marek Szyprowski <m.szyprowski@samsung.com>
Cc: linux-rpi-kernel@lists.infradead.org, jeremy.linton@arm.com,
Nicolas Saenz Julienne <nsaenzjulienne@suse.de>,
linux-kernel@vger.kernel.org
Subject: [PATCH 1/4] dma-direct: Provide function to check physical memory area validity
Date: Thu, 9 Jul 2020 18:19:01 +0200 [thread overview]
Message-ID: <20200709161903.26229-2-nsaenzjulienne@suse.de> (raw)
In-Reply-To: <20200709161903.26229-1-nsaenzjulienne@suse.de>
dma_coherent_ok() checks if a physical memory area fits a device's DMA
constraints.
Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
---
include/linux/dma-direct.h | 1 +
kernel/dma/direct.c | 2 +-
2 files changed, 2 insertions(+), 1 deletion(-)
diff --git a/include/linux/dma-direct.h b/include/linux/dma-direct.h
index cdfa400f89b3..cb23a8305132 100644
--- a/include/linux/dma-direct.h
+++ b/include/linux/dma-direct.h
@@ -69,6 +69,7 @@ static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size,
u64 dma_direct_get_required_mask(struct device *dev);
gfp_t dma_direct_optimal_gfp_mask(struct device *dev, u64 dma_mask,
u64 *phys_mask);
+bool dma_coherent_ok(struct device *dev, phys_addr_t phys, size_t size);
void *dma_direct_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle,
gfp_t gfp, unsigned long attrs);
void dma_direct_free(struct device *dev, size_t size, void *cpu_addr,
diff --git a/kernel/dma/direct.c b/kernel/dma/direct.c
index 93f578a8e613..4de864cacd22 100644
--- a/kernel/dma/direct.c
+++ b/kernel/dma/direct.c
@@ -70,7 +70,7 @@ gfp_t dma_direct_optimal_gfp_mask(struct device *dev, u64 dma_mask,
return 0;
}
-static bool dma_coherent_ok(struct device *dev, phys_addr_t phys, size_t size)
+bool dma_coherent_ok(struct device *dev, phys_addr_t phys, size_t size)
{
return phys_to_dma_direct(dev, phys) + size - 1 <=
min_not_zero(dev->coherent_dma_mask, dev->bus_dma_limit);
--
2.27.0
next prev parent reply other threads:[~2020-07-09 16:19 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-09 16:19 [PATCH 0/4] dma-pool: Fix atomic pool selection Nicolas Saenz Julienne
2020-07-09 16:19 ` Nicolas Saenz Julienne [this message]
2020-07-09 16:19 ` [PATCH 2/4] dma-pool: Get rid of dma_in_atomic_pool() Nicolas Saenz Julienne
2020-07-09 21:51 ` David Rientjes
2020-07-10 6:50 ` Christoph Hellwig
2020-07-09 16:19 ` [PATCH 3/4] dma-pool: Introduce dma_guess_pool() Nicolas Saenz Julienne
2020-07-14 11:22 ` Christoph Hellwig
2020-07-14 11:40 ` Nicolas Saenz Julienne
2020-07-09 16:19 ` [PATCH 4/4] dma-pool: Make sure atomic pool suits device Nicolas Saenz Julienne
2020-07-10 18:52 ` [PATCH 0/4] dma-pool: Fix atomic pool selection Jeremy Linton
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