Add a gfp_t parameter to the iommu_ops::map function. Remove the needless locking in the AMD iommu driver.
The iommu_ops::map function (or the iommu_map function which calls it) was always supposed to be sleepable (according to Joerg's comment in this thread: https://lore.kernel.org/patchwork/patch/977520/ ) and so should probably have had a "might_sleep()" since it was written. However currently the dma-iommu api can call iommu_map in an atomic context, which it shouldn't do. This doesn't cause any problems because any iommu driver which uses the dma-iommu api uses gfp_atomic in it's iommu_ops::map function. But doing this wastes the memory allocators atomic pools. Signed-off-by: Tom Murphy <murph...@tcd.ie> --- drivers/iommu/amd_iommu.c | 3 ++- drivers/iommu/arm-smmu-v3.c | 2 +- drivers/iommu/arm-smmu.c | 2 +- drivers/iommu/dma-iommu.c | 6 ++--- drivers/iommu/exynos-iommu.c | 2 +- drivers/iommu/intel-iommu.c | 2 +- drivers/iommu/iommu.c | 43 +++++++++++++++++++++++++++++----- drivers/iommu/ipmmu-vmsa.c | 2 +- drivers/iommu/msm_iommu.c | 2 +- drivers/iommu/mtk_iommu.c | 2 +- drivers/iommu/mtk_iommu_v1.c | 2 +- drivers/iommu/omap-iommu.c | 2 +- drivers/iommu/qcom_iommu.c | 2 +- drivers/iommu/rockchip-iommu.c | 2 +- drivers/iommu/s390-iommu.c | 2 +- drivers/iommu/tegra-gart.c | 2 +- drivers/iommu/tegra-smmu.c | 2 +- drivers/iommu/virtio-iommu.c | 2 +- include/linux/iommu.h | 21 ++++++++++++++++- 19 files changed, 77 insertions(+), 26 deletions(-) diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c index 065639e090fe..fd8da60f7359 100644 --- a/drivers/iommu/amd_iommu.c +++ b/drivers/iommu/amd_iommu.c @@ -3030,7 +3030,8 @@ static int amd_iommu_attach_device(struct iommu_domain *dom, } static int amd_iommu_map(struct iommu_domain *dom, unsigned long iova, - phys_addr_t paddr, size_t page_size, int iommu_prot) + phys_addr_t paddr, size_t page_size, int iommu_prot, + gfp_t gfp) { struct protection_domain *domain = to_pdomain(dom); int prot = 0; diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c index 4d5a694f02c2..66dee90877d7 100644 --- a/drivers/iommu/arm-smmu-v3.c +++ b/drivers/iommu/arm-smmu-v3.c @@ -1964,7 +1964,7 @@ static int arm_smmu_attach_dev(struct iommu_domain *domain, struct device *dev) } static int arm_smmu_map(struct iommu_domain *domain, unsigned long iova, - phys_addr_t paddr, size_t size, int prot) + phys_addr_t paddr, size_t size, int prot, gfp_t gfp) { struct io_pgtable_ops *ops = to_smmu_domain(domain)->pgtbl_ops; diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c index 5aeb1dbfaa08..f33ab7ef9049 100644 --- a/drivers/iommu/arm-smmu.c +++ b/drivers/iommu/arm-smmu.c @@ -1277,7 +1277,7 @@ static int arm_smmu_attach_dev(struct iommu_domain *domain, struct device *dev) } static int arm_smmu_map(struct iommu_domain *domain, unsigned long iova, - phys_addr_t paddr, size_t size, int prot) + phys_addr_t paddr, size_t size, int prot, gfp_t gfp) { struct io_pgtable_ops *ops = to_smmu_domain(domain)->pgtbl_ops; struct arm_smmu_device *smmu = to_smmu_domain(domain)->smmu; diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c index 0dee374fc64a..e64dbbcde63c 100644 --- a/drivers/iommu/dma-iommu.c +++ b/drivers/iommu/dma-iommu.c @@ -471,7 +471,7 @@ static dma_addr_t __iommu_dma_map(struct device *dev, phys_addr_t phys, if (!iova) return DMA_MAPPING_ERROR; - if (iommu_map(domain, iova, phys - iova_off, size, prot)) { + if (iommu_map_atomic(domain, iova, phys - iova_off, size, prot)) { iommu_dma_free_iova(cookie, iova, size); return DMA_MAPPING_ERROR; } @@ -615,7 +615,7 @@ static void *iommu_dma_alloc_remap(struct device *dev, size_t size, arch_dma_prep_coherent(sg_page(sg), sg->length); } - if (iommu_map_sg(domain, iova, sgt.sgl, sgt.orig_nents, ioprot) + if (iommu_map_sg_atomic(domain, iova, sgt.sgl, sgt.orig_nents, ioprot) < size) goto out_free_sg; @@ -875,7 +875,7 @@ static int iommu_dma_map_sg(struct device *dev, struct scatterlist *sg, * We'll leave any physical concatenation to the IOMMU driver's * implementation - it knows better than we do. */ - if (iommu_map_sg(domain, iova, sg, nents, prot) < iova_len) + if (iommu_map_sg_atomic(domain, iova, sg, nents, prot) < iova_len) goto out_free_iova; return __finalise_sg(dev, sg, nents, iova); diff --git a/drivers/iommu/exynos-iommu.c b/drivers/iommu/exynos-iommu.c index 05c6bc099d62..46414234c179 100644 --- a/drivers/iommu/exynos-iommu.c +++ b/drivers/iommu/exynos-iommu.c @@ -1078,7 +1078,7 @@ static int lv2set_page(sysmmu_pte_t *pent, phys_addr_t paddr, size_t size, */ static int exynos_iommu_map(struct iommu_domain *iommu_domain, unsigned long l_iova, phys_addr_t paddr, size_t size, - int prot) + int prot, gfp_t gfp) { struct exynos_iommu_domain *domain = to_exynos_domain(iommu_domain); sysmmu_pte_t *entry; diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c index 53998200ba9d..34b0587ac444 100644 --- a/drivers/iommu/intel-iommu.c +++ b/drivers/iommu/intel-iommu.c @@ -5173,7 +5173,7 @@ static void intel_iommu_aux_detach_device(struct iommu_domain *domain, static int intel_iommu_map(struct iommu_domain *domain, unsigned long iova, phys_addr_t hpa, - size_t size, int iommu_prot) + size_t size, int iommu_prot, gfp_t gfp) { struct dmar_domain *dmar_domain = to_dmar_domain(domain); u64 max_addr; diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c index d20a8e76afc3..de93eea22e0f 100644 --- a/drivers/iommu/iommu.c +++ b/drivers/iommu/iommu.c @@ -1565,8 +1565,8 @@ static size_t iommu_pgsize(struct iommu_domain *domain, return pgsize; } -int iommu_map(struct iommu_domain *domain, unsigned long iova, - phys_addr_t paddr, size_t size, int prot) +int __iommu_map(struct iommu_domain *domain, unsigned long iova, + phys_addr_t paddr, size_t size, int prot, gfp_t gfp) { const struct iommu_ops *ops = domain->ops; unsigned long orig_iova = iova; @@ -1603,8 +1603,8 @@ int iommu_map(struct iommu_domain *domain, unsigned long iova, pr_debug("mapping: iova 0x%lx pa %pa pgsize 0x%zx\n", iova, &paddr, pgsize); + ret = ops->map(domain, iova, paddr, pgsize, prot, gfp); - ret = ops->map(domain, iova, paddr, pgsize, prot); if (ret) break; @@ -1624,8 +1624,22 @@ int iommu_map(struct iommu_domain *domain, unsigned long iova, return ret; } + +int iommu_map(struct iommu_domain *domain, unsigned long iova, + phys_addr_t paddr, size_t size, int prot) +{ + might_sleep(); + return __iommu_map(domain, iova, paddr, size, prot, GFP_KERNEL); +} EXPORT_SYMBOL_GPL(iommu_map); +int iommu_map_atomic(struct iommu_domain *domain, unsigned long iova, + phys_addr_t paddr, size_t size, int prot) +{ + return __iommu_map(domain, iova, paddr, size, prot, GFP_ATOMIC); +} +EXPORT_SYMBOL_GPL(iommu_map_atomic); + static size_t __iommu_unmap(struct iommu_domain *domain, unsigned long iova, size_t size, bool sync) @@ -1700,8 +1714,9 @@ size_t iommu_unmap_fast(struct iommu_domain *domain, } EXPORT_SYMBOL_GPL(iommu_unmap_fast); -size_t iommu_map_sg(struct iommu_domain *domain, unsigned long iova, - struct scatterlist *sg, unsigned int nents, int prot) +size_t __iommu_map_sg(struct iommu_domain *domain, unsigned long iova, + struct scatterlist *sg, unsigned int nents, int prot, + gfp_t gfp) { size_t len = 0, mapped = 0; phys_addr_t start; @@ -1712,7 +1727,9 @@ size_t iommu_map_sg(struct iommu_domain *domain, unsigned long iova, phys_addr_t s_phys = sg_phys(sg); if (len && s_phys != start + len) { - ret = iommu_map(domain, iova + mapped, start, len, prot); + ret = __iommu_map(domain, iova + mapped, start, + len, prot, gfp); + if (ret) goto out_err; @@ -1740,8 +1757,22 @@ size_t iommu_map_sg(struct iommu_domain *domain, unsigned long iova, return 0; } + +size_t iommu_map_sg(struct iommu_domain *domain, unsigned long iova, + struct scatterlist *sg, unsigned int nents, int prot) +{ + might_sleep(); + return __iommu_map_sg(domain, iova, sg, nents, prot, GFP_KERNEL); +} EXPORT_SYMBOL_GPL(iommu_map_sg); +size_t iommu_map_sg_atomic(struct iommu_domain *domain, unsigned long iova, + struct scatterlist *sg, unsigned int nents, int prot) +{ + return __iommu_map_sg(domain, iova, sg, nents, prot, GFP_ATOMIC); +} +EXPORT_SYMBOL_GPL(iommu_map_sg_atomic); + int iommu_domain_window_enable(struct iommu_domain *domain, u32 wnd_nr, phys_addr_t paddr, u64 size, int prot) { diff --git a/drivers/iommu/ipmmu-vmsa.c b/drivers/iommu/ipmmu-vmsa.c index 408ad0b25919..7f4cdaf59f0b 100644 --- a/drivers/iommu/ipmmu-vmsa.c +++ b/drivers/iommu/ipmmu-vmsa.c @@ -721,7 +721,7 @@ static void ipmmu_detach_device(struct iommu_domain *io_domain, } static int ipmmu_map(struct iommu_domain *io_domain, unsigned long iova, - phys_addr_t paddr, size_t size, int prot) + phys_addr_t paddr, size_t size, int prot, gfp_t gfp) { struct ipmmu_vmsa_domain *domain = to_vmsa_domain(io_domain); diff --git a/drivers/iommu/msm_iommu.c b/drivers/iommu/msm_iommu.c index b25e2eb9e038..ba89cbca0d87 100644 --- a/drivers/iommu/msm_iommu.c +++ b/drivers/iommu/msm_iommu.c @@ -495,7 +495,7 @@ static void msm_iommu_detach_dev(struct iommu_domain *domain, } static int msm_iommu_map(struct iommu_domain *domain, unsigned long iova, - phys_addr_t pa, size_t len, int prot) + phys_addr_t pa, size_t len, int prot, gfp_t gfp) { struct msm_priv *priv = to_msm_priv(domain); unsigned long flags; diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c index 82e4be4dfdaf..53371b9e9af5 100644 --- a/drivers/iommu/mtk_iommu.c +++ b/drivers/iommu/mtk_iommu.c @@ -356,7 +356,7 @@ static void mtk_iommu_detach_device(struct iommu_domain *domain, } static int mtk_iommu_map(struct iommu_domain *domain, unsigned long iova, - phys_addr_t paddr, size_t size, int prot) + phys_addr_t paddr, size_t size, int prot, gfp_t gfp) { struct mtk_iommu_domain *dom = to_mtk_domain(domain); unsigned long flags; diff --git a/drivers/iommu/mtk_iommu_v1.c b/drivers/iommu/mtk_iommu_v1.c index abeeac488372..453e704bee3d 100644 --- a/drivers/iommu/mtk_iommu_v1.c +++ b/drivers/iommu/mtk_iommu_v1.c @@ -295,7 +295,7 @@ static void mtk_iommu_detach_device(struct iommu_domain *domain, } static int mtk_iommu_map(struct iommu_domain *domain, unsigned long iova, - phys_addr_t paddr, size_t size, int prot) + phys_addr_t paddr, size_t size, int prot, gfp_t gfp) { struct mtk_iommu_domain *dom = to_mtk_domain(domain); unsigned int page_num = size >> MT2701_IOMMU_PAGE_SHIFT; diff --git a/drivers/iommu/omap-iommu.c b/drivers/iommu/omap-iommu.c index d2fb347aa4ff..c1d5a71285dc 100644 --- a/drivers/iommu/omap-iommu.c +++ b/drivers/iommu/omap-iommu.c @@ -1109,7 +1109,7 @@ static u32 iotlb_init_entry(struct iotlb_entry *e, u32 da, u32 pa, int pgsz) } static int omap_iommu_map(struct iommu_domain *domain, unsigned long da, - phys_addr_t pa, size_t bytes, int prot) + phys_addr_t pa, size_t bytes, int prot, gfp_t gfp) { struct omap_iommu_domain *omap_domain = to_omap_domain(domain); struct device *dev = omap_domain->dev; diff --git a/drivers/iommu/qcom_iommu.c b/drivers/iommu/qcom_iommu.c index 8cdd3f059513..a01e07a4e76f 100644 --- a/drivers/iommu/qcom_iommu.c +++ b/drivers/iommu/qcom_iommu.c @@ -411,7 +411,7 @@ static void qcom_iommu_detach_dev(struct iommu_domain *domain, struct device *de } static int qcom_iommu_map(struct iommu_domain *domain, unsigned long iova, - phys_addr_t paddr, size_t size, int prot) + phys_addr_t paddr, size_t size, int prot, gfp_t gfp) { int ret; unsigned long flags; diff --git a/drivers/iommu/rockchip-iommu.c b/drivers/iommu/rockchip-iommu.c index 77d4bd93fe4b..aa3507f35107 100644 --- a/drivers/iommu/rockchip-iommu.c +++ b/drivers/iommu/rockchip-iommu.c @@ -760,7 +760,7 @@ static int rk_iommu_map_iova(struct rk_iommu_domain *rk_domain, u32 *pte_addr, } static int rk_iommu_map(struct iommu_domain *domain, unsigned long _iova, - phys_addr_t paddr, size_t size, int prot) + phys_addr_t paddr, size_t size, int prot, gfp_t gfp) { struct rk_iommu_domain *rk_domain = to_rk_domain(domain); unsigned long flags; diff --git a/drivers/iommu/s390-iommu.c b/drivers/iommu/s390-iommu.c index 22d4db302c1c..efa6aa68521d 100644 --- a/drivers/iommu/s390-iommu.c +++ b/drivers/iommu/s390-iommu.c @@ -265,7 +265,7 @@ static int s390_iommu_update_trans(struct s390_domain *s390_domain, } static int s390_iommu_map(struct iommu_domain *domain, unsigned long iova, - phys_addr_t paddr, size_t size, int prot) + phys_addr_t paddr, size_t size, int prot, gfp_t gfp) { struct s390_domain *s390_domain = to_s390_domain(domain); int flags = ZPCI_PTE_VALID, rc = 0; diff --git a/drivers/iommu/tegra-gart.c b/drivers/iommu/tegra-gart.c index 6d40bc1b38bf..43c725243e8a 100644 --- a/drivers/iommu/tegra-gart.c +++ b/drivers/iommu/tegra-gart.c @@ -178,7 +178,7 @@ static inline int __gart_iommu_map(struct gart_device *gart, unsigned long iova, } static int gart_iommu_map(struct iommu_domain *domain, unsigned long iova, - phys_addr_t pa, size_t bytes, int prot) + phys_addr_t pa, size_t bytes, int prot, gfp_t gfp) { struct gart_device *gart = gart_handle; int ret; diff --git a/drivers/iommu/tegra-smmu.c b/drivers/iommu/tegra-smmu.c index 463ee08f7d3a..32178364cfe2 100644 --- a/drivers/iommu/tegra-smmu.c +++ b/drivers/iommu/tegra-smmu.c @@ -653,7 +653,7 @@ static void tegra_smmu_set_pte(struct tegra_smmu_as *as, unsigned long iova, } static int tegra_smmu_map(struct iommu_domain *domain, unsigned long iova, - phys_addr_t paddr, size_t size, int prot) + phys_addr_t paddr, size_t size, int prot, gfp_t gfp) { struct tegra_smmu_as *as = to_smmu_as(domain); dma_addr_t pte_dma; diff --git a/drivers/iommu/virtio-iommu.c b/drivers/iommu/virtio-iommu.c index 4620dd221ffd..dbf5632bee3c 100644 --- a/drivers/iommu/virtio-iommu.c +++ b/drivers/iommu/virtio-iommu.c @@ -707,7 +707,7 @@ static int viommu_attach_dev(struct iommu_domain *domain, struct device *dev) } static int viommu_map(struct iommu_domain *domain, unsigned long iova, - phys_addr_t paddr, size_t size, int prot) + phys_addr_t paddr, size_t size, int prot, gfp_t gfp) { int ret; int flags; diff --git a/include/linux/iommu.h b/include/linux/iommu.h index 374ef0cfd343..e9f3ceda38a6 100644 --- a/include/linux/iommu.h +++ b/include/linux/iommu.h @@ -224,7 +224,7 @@ struct iommu_ops { int (*attach_dev)(struct iommu_domain *domain, struct device *dev); void (*detach_dev)(struct iommu_domain *domain, struct device *dev); int (*map)(struct iommu_domain *domain, unsigned long iova, - phys_addr_t paddr, size_t size, int prot); + phys_addr_t paddr, size_t size, int prot, gfp_t gfp); size_t (*unmap)(struct iommu_domain *domain, unsigned long iova, size_t size); void (*flush_iotlb_all)(struct iommu_domain *domain); @@ -337,12 +337,17 @@ extern struct iommu_domain *iommu_get_domain_for_dev(struct device *dev); extern struct iommu_domain *iommu_get_dma_domain(struct device *dev); extern int iommu_map(struct iommu_domain *domain, unsigned long iova, phys_addr_t paddr, size_t size, int prot); +extern int iommu_map_atomic(struct iommu_domain *domain, unsigned long iova, + phys_addr_t paddr, size_t size, int prot); extern size_t iommu_unmap(struct iommu_domain *domain, unsigned long iova, size_t size); extern size_t iommu_unmap_fast(struct iommu_domain *domain, unsigned long iova, size_t size); extern size_t iommu_map_sg(struct iommu_domain *domain, unsigned long iova, struct scatterlist *sg,unsigned int nents, int prot); +extern size_t iommu_map_sg_atomic(struct iommu_domain *domain, + unsigned long iova, struct scatterlist *sg, + unsigned int nents, int prot); extern phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova); extern void iommu_set_fault_handler(struct iommu_domain *domain, iommu_fault_handler_t handler, void *token); @@ -540,6 +545,13 @@ static inline int iommu_map(struct iommu_domain *domain, unsigned long iova, return -ENODEV; } +static inline int iommu_map_atomic(struct iommu_domain *domain, + unsigned long iova, phys_addr_t paddr, + size_t size, int prot) +{ + return -ENODEV; +} + static inline size_t iommu_unmap(struct iommu_domain *domain, unsigned long iova, size_t size) { @@ -559,6 +571,13 @@ static inline size_t iommu_map_sg(struct iommu_domain *domain, return 0; } +static inline size_t iommu_map_sg_atomic(struct iommu_domain *domain, + unsigned long iova, struct scatterlist *sg, + unsigned int nents, int prot) +{ + return 0; +} + static inline void iommu_flush_tlb_all(struct iommu_domain *domain) { } -- 2.20.1
