Re: [PATCH v3 01/10] iommu: Add a gfp parameter to iommu_map()

Mathieu Poirier
2023-01-24T20:51:04Z

On Mon, Jan 23, 2023 at 04:35:54PM -0400, Jason Gunthorpe wrote:
> The internal mechanisms support this, but instead of exposting the gfp to
> the caller it wrappers it into iommu_map() and iommu_map_atomic()
>
> Fix this instead of adding more variants for GFP_KERNEL_ACCOUNT.
>
> Reviewed-by: Kevin Tian <kevin.tian@intel.com>
> Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
> ---
> arch/arm/mm/dma-mapping.c | 11 ++++++----
> .../drm/nouveau/nvkm/subdev/instmem/gk20a.c | 3 ++-
> drivers/gpu/drm/tegra/drm.c | 2 +-
> drivers/gpu/host1x/cdma.c | 2 +-
> drivers/infiniband/hw/usnic/usnic_uiom.c | 4 ++--
> drivers/iommu/dma-iommu.c | 2 +-
> drivers/iommu/iommu.c | 22 +++++++++----------
> drivers/iommu/iommufd/pages.c | 6 +++--
> drivers/media/platform/qcom/venus/firmware.c | 2 +-
> drivers/net/ipa/ipa_mem.c | 6 +++--
> drivers/net/wireless/ath/ath10k/snoc.c | 2 +-
> drivers/net/wireless/ath/ath11k/ahb.c | 4 ++--
> drivers/remoteproc/remoteproc_core.c | 5 +++--

Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org>

> drivers/vfio/vfio_iommu_type1.c | 9 ++++----
> drivers/vhost/vdpa.c | 2 +-
> include/linux/iommu.h | 4 ++--
> 16 files changed, 48 insertions(+), 38 deletions(-)
>
> diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c
> index c135f6e37a00ca..8bc01071474ab7 100644
> --- a/arch/arm/mm/dma-mapping.c
> +++ b/arch/arm/mm/dma-mapping.c
> @@ -984,7 +984,8 @@ __iommu_create_mapping(struct device *dev, struct page **pages, size_t size,
>
> len = (j - i) << PAGE_SHIFT;
> ret = iommu_map(mapping->domain, iova, phys, len,
> - __dma_info_to_prot(DMA_BIDIRECTIONAL, attrs));
> + __dma_info_to_prot(DMA_BIDIRECTIONAL, attrs),
> + GFP_KERNEL);
> if (ret < 0)
> goto fail;
> iova += len;
> @@ -1207,7 +1208,8 @@ static int __map_sg_chunk(struct device *dev, struct scatterlist *sg,
>
> prot = __dma_info_to_prot(dir, attrs);
>
> - ret = iommu_map(mapping->domain, iova, phys, len, prot);
> + ret = iommu_map(mapping->domain, iova, phys, len, prot,
> + GFP_KERNEL);
> if (ret < 0)
> goto fail;
> count += len >> PAGE_SHIFT;
> @@ -1379,7 +1381,8 @@ static dma_addr_t arm_iommu_map_page(struct device *dev, struct page *page,
>
> prot = __dma_info_to_prot(dir, attrs);
>
> - ret = iommu_map(mapping->domain, dma_addr, page_to_phys(page), len, prot);
> + ret = iommu_map(mapping->domain, dma_addr, page_to_phys(page), len,
> + prot, GFP_KERNEL);
> if (ret < 0)
> goto fail;
>
> @@ -1443,7 +1446,7 @@ static dma_addr_t arm_iommu_map_resource(struct device *dev,
>
> prot = __dma_info_to_prot(dir, attrs) | IOMMU_MMIO;
>
> - ret = iommu_map(mapping->domain, dma_addr, addr, len, prot);
> + ret = iommu_map(mapping->domain, dma_addr, addr, len, prot, GFP_KERNEL);
> if (ret < 0)
> goto fail;
>
> diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/instmem/gk20a.c b/drivers/gpu/drm/nouveau/nvkm/subdev/instmem/gk20a.c
> index 648ecf5a8fbc2a..a4ac94a2ab57fc 100644
> --- a/drivers/gpu/drm/nouveau/nvkm/subdev/instmem/gk20a.c
> +++ b/drivers/gpu/drm/nouveau/nvkm/subdev/instmem/gk20a.c
> @@ -475,7 +475,8 @@ gk20a_instobj_ctor_iommu(struct gk20a_instmem *imem, u32 npages, u32 align,
> u32 offset = (r->offset + i) << imem->iommu_pgshift;
>
> ret = iommu_map(imem->domain, offset, node->dma_addrs[i],
> - PAGE_SIZE, IOMMU_READ | IOMMU_WRITE);
> + PAGE_SIZE, IOMMU_READ | IOMMU_WRITE,
> + GFP_KERNEL);
> if (ret < 0) {
> nvkm_error(subdev, "IOMMU mapping failure: %d\n", ret);
>
> diff --git a/drivers/gpu/drm/tegra/drm.c b/drivers/gpu/drm/tegra/drm.c
> index 7bd2e65c2a16c5..6ca9f396e55be4 100644
> --- a/drivers/gpu/drm/tegra/drm.c
> +++ b/drivers/gpu/drm/tegra/drm.c
> @@ -1057,7 +1057,7 @@ void *tegra_drm_alloc(struct tegra_drm *tegra, size_t size, dma_addr_t *dma)
>
> *dma = iova_dma_addr(&tegra->carveout.domain, alloc);
> err = iommu_map(tegra->domain, *dma, virt_to_phys(virt),
> - size, IOMMU_READ | IOMMU_WRITE);
> + size, IOMMU_READ | IOMMU_WRITE, GFP_KERNEL);
> if (err < 0)
> goto free_iova;
>
> diff --git a/drivers/gpu/host1x/cdma.c b/drivers/gpu/host1x/cdma.c
> index 103fda055394ab..4ddfcd2138c95b 100644
> --- a/drivers/gpu/host1x/cdma.c
> +++ b/drivers/gpu/host1x/cdma.c
> @@ -105,7 +105,7 @@ static int host1x_pushbuffer_init(struct push_buffer *pb)
>
> pb->dma = iova_dma_addr(&host1x->iova, alloc);
> err = iommu_map(host1x->domain, pb->dma, pb->phys, size,
> - IOMMU_READ);
> + IOMMU_READ, GFP_KERNEL);
> if (err)
> goto iommu_free_iova;
> } else {
> diff --git a/drivers/infiniband/hw/usnic/usnic_uiom.c b/drivers/infiniband/hw/usnic/usnic_uiom.c
> index c301b3be9f303d..aeeaca65ace96a 100644
> --- a/drivers/infiniband/hw/usnic/usnic_uiom.c
> +++ b/drivers/infiniband/hw/usnic/usnic_uiom.c
> @@ -277,7 +277,7 @@ static int usnic_uiom_map_sorted_intervals(struct list_head *intervals,
> usnic_dbg("va 0x%lx pa %pa size 0x%zx flags 0x%x",
> va_start, &pa_start, size, flags);
> err = iommu_map(pd->domain, va_start, pa_start,
> - size, flags);
> + size, flags, GFP_KERNEL);
> if (err) {
> usnic_err("Failed to map va 0x%lx pa %pa size 0x%zx with err %d\n",
> va_start, &pa_start, size, err);
> @@ -294,7 +294,7 @@ static int usnic_uiom_map_sorted_intervals(struct list_head *intervals,
> usnic_dbg("va 0x%lx pa %pa size 0x%zx flags 0x%x\n",
> va_start, &pa_start, size, flags);
> err = iommu_map(pd->domain, va_start, pa_start,
> - size, flags);
> + size, flags, GFP_KERNEL);
> if (err) {
> usnic_err("Failed to map va 0x%lx pa %pa size 0x%zx with err %d\n",
> va_start, &pa_start, size, err);
> diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c
> index f798c44e090337..8bdb65e7686ff9 100644
> --- a/drivers/iommu/dma-iommu.c
> +++ b/drivers/iommu/dma-iommu.c
> @@ -1615,7 +1615,7 @@ static struct iommu_dma_msi_page *iommu_dma_get_msi_page(struct device *dev,
> if (!iova)
> goto out_free_page;
>
> - if (iommu_map(domain, iova, msi_addr, size, prot))
> + if (iommu_map(domain, iova, msi_addr, size, prot, GFP_KERNEL))
> goto out_free_iova;
>
> INIT_LIST_HEAD(&msi_page->list);
> diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
> index 5f6a85aea501ec..7dac062b58f039 100644
> --- a/drivers/iommu/iommu.c
> +++ b/drivers/iommu/iommu.c
> @@ -930,7 +930,7 @@ static int iommu_create_device_direct_mappings(struct iommu_group *group,
> if (map_size) {
> ret = iommu_map(domain, addr - map_size,
> addr - map_size, map_size,
> - entry->prot);
> + entry->prot, GFP_KERNEL);
> if (ret)
> goto out;
> map_size = 0;
> @@ -2360,31 +2360,31 @@ static int __iommu_map(struct iommu_domain *domain, unsigned long iova,
> return ret;
> }
>
> -static int _iommu_map(struct iommu_domain *domain, unsigned long iova,
> - phys_addr_t paddr, size_t size, int prot, gfp_t gfp)
> +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_domain_ops *ops = domain->ops;
> int ret;
>
> + might_sleep_if(gfpflags_allow_blocking(gfp));
> +
> + /* Discourage passing strange GFP flags */
> + if (WARN_ON_ONCE(gfp & (__GFP_COMP | __GFP_DMA | __GFP_DMA32 |
> + __GFP_HIGHMEM)))
> + return -EINVAL;
> +
> ret = __iommu_map(domain, iova, paddr, size, prot, gfp);
> if (ret == 0 && ops->iotlb_sync_map)
> ops->iotlb_sync_map(domain, iova, size);
>
> 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);
> + return iommu_map(domain, iova, paddr, size, prot, GFP_ATOMIC);
> }
> EXPORT_SYMBOL_GPL(iommu_map_atomic);
>
> diff --git a/drivers/iommu/iommufd/pages.c b/drivers/iommu/iommufd/pages.c
> index 1e1d3509efae5e..22cc3bb0c6c55a 100644
> --- a/drivers/iommu/iommufd/pages.c
> +++ b/drivers/iommu/iommufd/pages.c
> @@ -456,7 +456,8 @@ static int batch_iommu_map_small(struct iommu_domain *domain,
> size % PAGE_SIZE);
>
> while (size) {
> - rc = iommu_map(domain, iova, paddr, PAGE_SIZE, prot);
> + rc = iommu_map(domain, iova, paddr, PAGE_SIZE, prot,
> + GFP_KERNEL);
> if (rc)
> goto err_unmap;
> iova += PAGE_SIZE;
> @@ -500,7 +501,8 @@ static int batch_to_domain(struct pfn_batch *batch, struct iommu_domain *domain,
> else
> rc = iommu_map(domain, iova,
> PFN_PHYS(batch->pfns[cur]) + page_offset,
> - next_iova - iova, area->iommu_prot);
> + next_iova - iova, area->iommu_prot,
> + GFP_KERNEL);
> if (rc)
> goto err_unmap;
> iova = next_iova;
> diff --git a/drivers/media/platform/qcom/venus/firmware.c b/drivers/media/platform/qcom/venus/firmware.c
> index 142d4c74017c04..07d4dceb5e72c7 100644
> --- a/drivers/media/platform/qcom/venus/firmware.c
> +++ b/drivers/media/platform/qcom/venus/firmware.c
> @@ -158,7 +158,7 @@ static int venus_boot_no_tz(struct venus_core *core, phys_addr_t mem_phys,
> core->fw.mapped_mem_size = mem_size;
>
> ret = iommu_map(iommu, VENUS_FW_START_ADDR, mem_phys, mem_size,
> - IOMMU_READ | IOMMU_WRITE | IOMMU_PRIV);
> + IOMMU_READ | IOMMU_WRITE | IOMMU_PRIV, GFP_KERNEL);
> if (ret) {
> dev_err(dev, "could not map video firmware region\n");
> return ret;
> diff --git a/drivers/net/ipa/ipa_mem.c b/drivers/net/ipa/ipa_mem.c
> index 9ec5af323f731d..991a7d39f06661 100644
> --- a/drivers/net/ipa/ipa_mem.c
> +++ b/drivers/net/ipa/ipa_mem.c
> @@ -466,7 +466,8 @@ static int ipa_imem_init(struct ipa *ipa, unsigned long addr, size_t size)
> size = PAGE_ALIGN(size + addr - phys);
> iova = phys; /* We just want a direct mapping */
>
> - ret = iommu_map(domain, iova, phys, size, IOMMU_READ | IOMMU_WRITE);
> + ret = iommu_map(domain, iova, phys, size, IOMMU_READ | IOMMU_WRITE,
> + GFP_KERNEL);
> if (ret)
> return ret;
>
> @@ -574,7 +575,8 @@ static int ipa_smem_init(struct ipa *ipa, u32 item, size_t size)
> size = PAGE_ALIGN(size + addr - phys);
> iova = phys; /* We just want a direct mapping */
>
> - ret = iommu_map(domain, iova, phys, size, IOMMU_READ | IOMMU_WRITE);
> + ret = iommu_map(domain, iova, phys, size, IOMMU_READ | IOMMU_WRITE,
> + GFP_KERNEL);
> if (ret)
> return ret;
>
> diff --git a/drivers/net/wireless/ath/ath10k/snoc.c b/drivers/net/wireless/ath/ath10k/snoc.c
> index cfcb759a87deac..9a82f0336d9537 100644
> --- a/drivers/net/wireless/ath/ath10k/snoc.c
> +++ b/drivers/net/wireless/ath/ath10k/snoc.c
> @@ -1639,7 +1639,7 @@ static int ath10k_fw_init(struct ath10k *ar)
>
> ret = iommu_map(iommu_dom, ar_snoc->fw.fw_start_addr,
> ar->msa.paddr, ar->msa.mem_size,
> - IOMMU_READ | IOMMU_WRITE);
> + IOMMU_READ | IOMMU_WRITE, GFP_KERNEL);
> if (ret) {
> ath10k_err(ar, "failed to map firmware region: %d\n", ret);
> goto err_iommu_detach;
> diff --git a/drivers/net/wireless/ath/ath11k/ahb.c b/drivers/net/wireless/ath/ath11k/ahb.c
> index d34a4d6325b2b4..df8fdc7067f99c 100644
> --- a/drivers/net/wireless/ath/ath11k/ahb.c
> +++ b/drivers/net/wireless/ath/ath11k/ahb.c
> @@ -1021,7 +1021,7 @@ static int ath11k_ahb_fw_resources_init(struct ath11k_base *ab)
>
> ret = iommu_map(iommu_dom, ab_ahb->fw.msa_paddr,
> ab_ahb->fw.msa_paddr, ab_ahb->fw.msa_size,
> - IOMMU_READ | IOMMU_WRITE);
> + IOMMU_READ | IOMMU_WRITE, GFP_KERNEL);
> if (ret) {
> ath11k_err(ab, "failed to map firmware region: %d\n", ret);
> goto err_iommu_detach;
> @@ -1029,7 +1029,7 @@ static int ath11k_ahb_fw_resources_init(struct ath11k_base *ab)
>
> ret = iommu_map(iommu_dom, ab_ahb->fw.ce_paddr,
> ab_ahb->fw.ce_paddr, ab_ahb->fw.ce_size,
> - IOMMU_READ | IOMMU_WRITE);
> + IOMMU_READ | IOMMU_WRITE, GFP_KERNEL);
> if (ret) {
> ath11k_err(ab, "failed to map firmware CE region: %d\n", ret);
> goto err_iommu_unmap;
> diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
> index 1cd4815a6dd197..80072b6b628358 100644
> --- a/drivers/remoteproc/remoteproc_core.c
> +++ b/drivers/remoteproc/remoteproc_core.c
> @@ -643,7 +643,8 @@ static int rproc_handle_devmem(struct rproc *rproc, void *ptr,
> if (!mapping)
> return -ENOMEM;
>
> - ret = iommu_map(rproc->domain, rsc->da, rsc->pa, rsc->len, rsc->flags);
> + ret = iommu_map(rproc->domain, rsc->da, rsc->pa, rsc->len, rsc->flags,
> + GFP_KERNEL);
> if (ret) {
> dev_err(dev, "failed to map devmem: %d\n", ret);
> goto out;
> @@ -737,7 +738,7 @@ static int rproc_alloc_carveout(struct rproc *rproc,
> }
>
> ret = iommu_map(rproc->domain, mem->da, dma, mem->len,
> - mem->flags);
> + mem->flags, GFP_KERNEL);
> if (ret) {
> dev_err(dev, "iommu_map failed: %d\n", ret);
> goto free_mapping;
> diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c
> index 23c24fe98c00d4..e14f86a8ef5258 100644
> --- a/drivers/vfio/vfio_iommu_type1.c
> +++ b/drivers/vfio/vfio_iommu_type1.c
> @@ -1480,7 +1480,8 @@ static int vfio_iommu_map(struct vfio_iommu *iommu, dma_addr_t iova,
>
> list_for_each_entry(d, &iommu->domain_list, next) {
> ret = iommu_map(d->domain, iova, (phys_addr_t)pfn << PAGE_SHIFT,
> - npage << PAGE_SHIFT, prot | IOMMU_CACHE);
> + npage << PAGE_SHIFT, prot | IOMMU_CACHE,
> + GFP_KERNEL);
> if (ret)
> goto unwind;
>
> @@ -1777,8 +1778,8 @@ static int vfio_iommu_replay(struct vfio_iommu *iommu,
> size = npage << PAGE_SHIFT;
> }
>
> - ret = iommu_map(domain->domain, iova, phys,
> - size, dma->prot | IOMMU_CACHE);
> + ret = iommu_map(domain->domain, iova, phys, size,
> + dma->prot | IOMMU_CACHE, GFP_KERNEL);
> if (ret) {
> if (!dma->iommu_mapped) {
> vfio_unpin_pages_remote(dma, iova,
> @@ -1866,7 +1867,7 @@ static void vfio_test_domain_fgsp(struct vfio_domain *domain)
> return;
>
> ret = iommu_map(domain->domain, 0, page_to_phys(pages), PAGE_SIZE * 2,
> - IOMMU_READ | IOMMU_WRITE | IOMMU_CACHE);
> + IOMMU_READ | IOMMU_WRITE | IOMMU_CACHE, GFP_KERNEL);
> if (!ret) {
> size_t unmapped = iommu_unmap(domain->domain, 0, PAGE_SIZE);
>
> diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c
> index ec32f785dfdec1..fd1536de5b1df0 100644
> --- a/drivers/vhost/vdpa.c
> +++ b/drivers/vhost/vdpa.c
> @@ -792,7 +792,7 @@ static int vhost_vdpa_map(struct vhost_vdpa *v, struct vhost_iotlb *iotlb,
> r = ops->set_map(vdpa, asid, iotlb);
> } else {
> r = iommu_map(v->domain, iova, pa, size,
> - perm_to_iommu_flags(perm));
> + perm_to_iommu_flags(perm), GFP_KERNEL);
> }
> if (r) {
> vhost_iotlb_del_range(iotlb, iova, iova + size - 1);
> diff --git a/include/linux/iommu.h b/include/linux/iommu.h
> index 46e1347bfa2286..d2020994f292db 100644
> --- a/include/linux/iommu.h
> +++ b/include/linux/iommu.h
> @@ -467,7 +467,7 @@ extern int iommu_sva_unbind_gpasid(struct iommu_domain *domain,
> 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);
> + phys_addr_t paddr, size_t size, int prot, gfp_t gfp);
> 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,
> @@ -773,7 +773,7 @@ static inline struct iommu_domain *iommu_get_domain_for_dev(struct device *dev)
> }
>
> static inline int 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)
> {
> return -ENODEV;
> }
> --
> 2.39.0
>