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Peter Anvin" , David Woodhouse , iommu , linux-kernel , linux-s390 , linuxppc-dev , x86 , linux-ia64 Subject: [PATCH v5 4/6] s390/pci: add support for generic boot option iommu.dma_mode Date: Tue, 9 Apr 2019 20:53:06 +0800 Message-ID: <20190409125308.18304-5-thunder.leizhen@huawei.com> X-Mailer: git-send-email 2.19.2.windows.1 In-Reply-To: <20190409125308.18304-1-thunder.leizhen@huawei.com> References: <20190409125308.18304-1-thunder.leizhen@huawei.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-Originating-IP: [10.177.23.164] X-CFilter-Loop: Reflected X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Hanjun Guo , Zhen Lei Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" s390_iommu=strict is equivalent to iommu.dma_mode=strict. Signed-off-by: Zhen Lei --- Documentation/admin-guide/kernel-parameters.txt | 6 +++--- arch/s390/pci/pci_dma.c | 14 +++++++------- drivers/iommu/Kconfig | 1 + 3 files changed, 11 insertions(+), 10 deletions(-) diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index 92d1b3151d003c2..ab8e3c4798c0a2a 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -1815,9 +1815,9 @@ options(such as CONFIG_IOMMU_DEFAULT_PASSTHROUGH) to choose which mode to be used. Note: For historical reasons, ARM64/S390/PPC/X86 have - their specific options. Currently, only ARM64 support - this boot option, and hope other ARCHs to use this as - generic boot option. + their specific options. Currently, only ARM64/S390 + support this boot option, and hope other ARCHs to use + this as generic boot option. passthrough Configure DMA to bypass the IOMMU by default. lazy diff --git a/arch/s390/pci/pci_dma.c b/arch/s390/pci/pci_dma.c index 9e52d1527f71495..f658ca41547eed5 100644 --- a/arch/s390/pci/pci_dma.c +++ b/arch/s390/pci/pci_dma.c @@ -9,6 +9,7 @@ #include #include #include +#include #include #include #include @@ -17,7 +18,6 @@ static struct kmem_cache *dma_region_table_cache; static struct kmem_cache *dma_page_table_cache; -static int s390_iommu_strict; static int zpci_refresh_global(struct zpci_dev *zdev) { @@ -193,13 +193,13 @@ static int __dma_purge_tlb(struct zpci_dev *zdev, dma_addr_t dma_addr, if (!zdev->tlb_refresh) return 0; } else { - if (!s390_iommu_strict) + if (!IOMMU_DMA_MODE_IS_STRICT()) return 0; } ret = zpci_refresh_trans((u64) zdev->fh << 32, dma_addr, PAGE_ALIGN(size)); - if (ret == -ENOMEM && !s390_iommu_strict) { + if (ret == -ENOMEM && !IOMMU_DMA_MODE_IS_STRICT()) { /* enable the hypervisor to free some resources */ if (zpci_refresh_global(zdev)) goto out; @@ -278,7 +278,7 @@ static dma_addr_t dma_alloc_address(struct device *dev, int size) spin_lock_irqsave(&zdev->iommu_bitmap_lock, flags); offset = __dma_alloc_iommu(dev, zdev->next_bit, size); if (offset == -1) { - if (!s390_iommu_strict) { + if (!IOMMU_DMA_MODE_IS_STRICT()) { /* global flush before DMA addresses are reused */ if (zpci_refresh_global(zdev)) goto out_error; @@ -313,7 +313,7 @@ static void dma_free_address(struct device *dev, dma_addr_t dma_addr, int size) if (!zdev->iommu_bitmap) goto out; - if (s390_iommu_strict) + if (IOMMU_DMA_MODE_IS_STRICT()) bitmap_clear(zdev->iommu_bitmap, offset, size); else bitmap_set(zdev->lazy_bitmap, offset, size); @@ -584,7 +584,7 @@ int zpci_dma_init_device(struct zpci_dev *zdev) rc = -ENOMEM; goto free_dma_table; } - if (!s390_iommu_strict) { + if (!IOMMU_DMA_MODE_IS_STRICT()) { zdev->lazy_bitmap = vzalloc(zdev->iommu_pages / 8); if (!zdev->lazy_bitmap) { rc = -ENOMEM; @@ -675,7 +675,7 @@ void zpci_dma_exit(void) static int __init s390_iommu_setup(char *str) { if (!strncmp(str, "strict", 6)) - s390_iommu_strict = 1; + iommu_default_dma_mode_set(IOMMU_DMA_MODE_STRICT); return 0; } diff --git a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig index 1986f9767da488b..b7173b106cd816a 100644 --- a/drivers/iommu/Kconfig +++ b/drivers/iommu/Kconfig @@ -77,6 +77,7 @@ config IOMMU_DEBUGFS choice prompt "IOMMU dma mode" depends on IOMMU_API + default IOMMU_DEFAULT_LAZY if S390_IOMMU default IOMMU_DEFAULT_STRICT help This option allows IOMMU dma mode to be chose at build time, to -- 1.8.3