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Manjarres" To: iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org Cc: Liam Mark , joro@8bytes.org, pratikp@codeaurora.org, kernel-team@android.com, "Isaac J. Manjarres" Subject: [RFC PATCH] iommu/dma: Allow drivers to reserve an iova range Date: Fri, 14 Feb 2020 14:58:16 -0800 Message-Id: <1581721096-16235-1-git-send-email-isaacm@codeaurora.org> X-Mailer: git-send-email 1.9.1 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Liam Mark Some devices have a memory map which contains gaps or holes. In order for the device to have as much IOVA space as possible, allow its driver to inform the DMA-IOMMU layer that it should not allocate addresses from these holes. Change-Id: I15bd1d313d889c2572d0eb2adecf6bebde3267f7 Signed-off-by: Isaac J. Manjarres --- drivers/iommu/dma-iommu.c | 28 ++++++++++++++++++++++++++++ include/linux/dma-iommu.h | 9 +++++++++ 2 files changed, 37 insertions(+) diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c index a2e96a5..3b83e1a 100644 --- a/drivers/iommu/dma-iommu.c +++ b/drivers/iommu/dma-iommu.c @@ -368,6 +368,34 @@ static int iommu_dma_deferred_attach(struct device *dev, return 0; } +/* + * Should be called prior to using dma-apis + */ +int iommu_dma_reserve_iova(struct device *dev, dma_addr_t base, + u64 size) +{ + struct iommu_domain *domain; + struct iommu_dma_cookie *cookie; + struct iova_domain *iovad; + unsigned long pfn_lo, pfn_hi; + + domain = iommu_get_domain_for_dev(dev); + if (!domain || !domain->iova_cookie) + return -EINVAL; + + cookie = domain->iova_cookie; + iovad = &cookie->iovad; + + /* iova will be freed automatically by put_iova_domain() */ + pfn_lo = iova_pfn(iovad, base); + pfn_hi = iova_pfn(iovad, base + size - 1); + if (!reserve_iova(iovad, pfn_lo, pfn_hi)) + return -EINVAL; + + return 0; +} +EXPORT_SYMBOL(iommu_dma_reserve_iova); + /** * dma_info_to_prot - Translate DMA API directions and attributes to IOMMU API * page flags. diff --git a/include/linux/dma-iommu.h b/include/linux/dma-iommu.h index 2112f21..79eef7c 100644 --- a/include/linux/dma-iommu.h +++ b/include/linux/dma-iommu.h @@ -37,6 +37,9 @@ void iommu_dma_compose_msi_msg(struct msi_desc *desc, void iommu_dma_get_resv_regions(struct device *dev, struct list_head *list); +int iommu_dma_reserve_iova(struct device *dev, dma_addr_t base, + u64 size); + #else /* CONFIG_IOMMU_DMA */ struct iommu_domain; @@ -78,5 +81,11 @@ static inline void iommu_dma_get_resv_regions(struct device *dev, struct list_he { } +static inline int iommu_dma_reserve_iova(struct device *dev, dma_addr_t base, + u64 size) +{ + return -ENODEV; +} + #endif /* CONFIG_IOMMU_DMA */ #endif /* __DMA_IOMMU_H */ -- The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project