[PATCH v3 00/10] Let iommufd charge IOPTE allocations to the memory cgroup

[PATCH v3 00/10] Let iommufd charge IOPTE allocations to the memory cgroup

[Jason Gunthorpe]

iommufd follows the same design as KVM and uses memory cgroups to limit
the amount of kernel memory a iommufd file descriptor can pin down. The
various internal data structures already use GFP_KERNEL_ACCOUNT to charge
its own memory.

However, one of the biggest consumers of kernel memory is the IOPTEs
stored under the iommu_domain and these allocations are not tracked.

This series is the first step in fixing it.

The iommu driver contract already includes a 'gfp' argument to the
map_pages op, allowing iommufd to specify GFP_KERNEL_ACCOUNT and then
having the driver allocate the IOPTE tables with that flag will capture a
significant amount of the allocations.

Update the iommu_map() API to pass in the GFP argument, and fix all call
sites. Replace iommu_map_atomic().

Audit the "enterprise" iommu drivers to make sure they do the right thing.
Intel and S390 ignore the GFP argument and always use GFP_ATOMIC. This is
problematic for iommufd anyhow, so fix it. AMD and ARM SMMUv2/3 are
already correct.

A follow up series will be needed to capture the allocations made when the
iommu_domain itself is allocated, which will complete the job.

v3:
 - Leave a GFP_ATOMIC in "Add a gfp parameter to iommu_map_sg()"
   and move the conversion to gfp argument to "Use the gfp parameter in
   __iommu_dma_alloc_noncontiguous()"
 - Mask off the zone/policy flags from gfp before doing internal
   allocations and add a comment about Robin's note that this is to keep
   the buffer and internal seperate.
v2: https://lore.kernel.org/r/0-v2-ce66f632bd0d+484-iommu_map_gfp_jgg@nvidia.com
 - Prohibit bad GFP flags in the iommu wrappers
 - Split out the new GFP_KERNEL usages into dedicated patches so it is
   easier to check. No code change after the full series
v1: https://lore.kernel.org/r/0-v1-6e8b3997c46d+89e-iommu_map_gfp_jgg@nvidia.com

Jason Gunthorpe (10):
  iommu: Add a gfp parameter to iommu_map()
  iommu: Remove iommu_map_atomic()
  iommu: Add a gfp parameter to iommu_map_sg()
  iommu/dma: Use the gfp parameter in __iommu_dma_alloc_noncontiguous()
  iommufd: Use GFP_KERNEL_ACCOUNT for iommu_map()
  iommu/intel: Add a gfp parameter to alloc_pgtable_page()
  iommu/intel: Support the gfp argument to the map_pages op
  iommu/intel: Use GFP_KERNEL in sleepable contexts
  iommu/s390: Push the gfp parameter to the kmem_cache_alloc()'s
  iommu/s390: Use GFP_KERNEL in sleepable contexts

 arch/arm/mm/dma-mapping.c                     | 11 ++--
 arch/s390/include/asm/pci_dma.h               |  5 +-
 arch/s390/pci/pci_dma.c                       | 31 ++++++-----
 .../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                     | 18 +++++--
 drivers/iommu/intel/iommu.c                   | 36 +++++++------
 drivers/iommu/intel/iommu.h                   |  2 +-
 drivers/iommu/intel/pasid.c                   |  2 +-
 drivers/iommu/iommu.c                         | 53 +++++++------------
 drivers/iommu/iommufd/pages.c                 |  6 ++-
 drivers/iommu/s390-iommu.c                    | 15 +++---
 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 +-
 drivers/vfio/vfio_iommu_type1.c               |  9 ++--
 drivers/vhost/vdpa.c                          |  2 +-
 include/linux/iommu.h                         | 31 +++--------
 22 files changed, 126 insertions(+), 125 deletions(-)


base-commit: 5dc4c995db9eb45f6373a956eb1f69460e69e6d4
-- 
2.39.0


-- 
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ath11k@lists.infradead.org
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[PATCH v3 01/10] iommu: Add a gfp parameter to iommu_map()

[Jason Gunthorpe]

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 +++--
 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


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[PATCH v3 02/10] iommu: Remove iommu_map_atomic()

[Jason Gunthorpe]

There is only one call site and it can now just pass the GFP_ATOMIC to the
normal iommu_map().

Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
---
 drivers/iommu/dma-iommu.c | 2 +-
 drivers/iommu/iommu.c     | 7 -------
 include/linux/iommu.h     | 9 ---------
 3 files changed, 1 insertion(+), 17 deletions(-)

diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c
index 8bdb65e7686ff9..7016db569f81fc 100644
--- a/drivers/iommu/dma-iommu.c
+++ b/drivers/iommu/dma-iommu.c
@@ -713,7 +713,7 @@ static dma_addr_t __iommu_dma_map(struct device *dev, phys_addr_t phys,
 	if (!iova)
 		return DMA_MAPPING_ERROR;
 
-	if (iommu_map_atomic(domain, iova, phys - iova_off, size, prot)) {
+	if (iommu_map(domain, iova, phys - iova_off, size, prot, GFP_ATOMIC)) {
 		iommu_dma_free_iova(cookie, iova, size, NULL);
 		return DMA_MAPPING_ERROR;
 	}
diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index 7dac062b58f039..9412b420d07257 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -2381,13 +2381,6 @@ int iommu_map(struct iommu_domain *domain, unsigned long iova,
 }
 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_pages(struct iommu_domain *domain,
 				  unsigned long iova, size_t size,
 				  struct iommu_iotlb_gather *iotlb_gather)
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index d2020994f292db..521cd79700f4d8 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -468,8 +468,6 @@ 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, 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,
 			  size_t size);
 extern size_t iommu_unmap_fast(struct iommu_domain *domain,
@@ -778,13 +776,6 @@ 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)
 {
-- 
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[PATCH v3 03/10] iommu: Add a gfp parameter to iommu_map_sg()

[Jason Gunthorpe]

Follow the pattern for iommu_map() and remove iommu_map_sg_atomic().

This allows __iommu_dma_alloc_noncontiguous() to use a GFP_KERNEL
allocation here, based on the provided gfp flags.

Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
---
 drivers/iommu/dma-iommu.c |  5 +++--
 drivers/iommu/iommu.c     | 26 ++++++++++----------------
 include/linux/iommu.h     | 18 +++++-------------
 3 files changed, 18 insertions(+), 31 deletions(-)

diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c
index 7016db569f81fc..72cfa24503b8bc 100644
--- a/drivers/iommu/dma-iommu.c
+++ b/drivers/iommu/dma-iommu.c
@@ -833,7 +833,8 @@ static struct page **__iommu_dma_alloc_noncontiguous(struct device *dev,
 			arch_dma_prep_coherent(sg_page(sg), sg->length);
 	}
 
-	ret = iommu_map_sg_atomic(domain, iova, sgt->sgl, sgt->orig_nents, ioprot);
+	ret = iommu_map_sg(domain, iova, sgt->sgl, sgt->orig_nents, ioprot,
+			   GFP_ATOMIC);
 	if (ret < 0 || ret < size)
 		goto out_free_sg;
 
@@ -1281,7 +1282,7 @@ 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.
 	 */
-	ret = iommu_map_sg_atomic(domain, iova, sg, nents, prot);
+	ret = iommu_map_sg(domain, iova, sg, nents, prot, GFP_ATOMIC);
 	if (ret < 0 || ret < iova_len)
 		goto out_free_iova;
 
diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index 9412b420d07257..cc6e7c6bf72758 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -2470,9 +2470,9 @@ size_t iommu_unmap_fast(struct iommu_domain *domain,
 }
 EXPORT_SYMBOL_GPL(iommu_unmap_fast);
 
-static ssize_t __iommu_map_sg(struct iommu_domain *domain, unsigned long iova,
-		struct scatterlist *sg, unsigned int nents, int prot,
-		gfp_t gfp)
+ssize_t iommu_map_sg(struct iommu_domain *domain, unsigned long iova,
+		     struct scatterlist *sg, unsigned int nents, int prot,
+		     gfp_t gfp)
 {
 	const struct iommu_domain_ops *ops = domain->ops;
 	size_t len = 0, mapped = 0;
@@ -2480,6 +2480,13 @@ static ssize_t __iommu_map_sg(struct iommu_domain *domain, unsigned long iova,
 	unsigned int i = 0;
 	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;
+
 	while (i <= nents) {
 		phys_addr_t s_phys = sg_phys(sg);
 
@@ -2519,21 +2526,8 @@ static ssize_t __iommu_map_sg(struct iommu_domain *domain, unsigned long iova,
 
 	return ret;
 }
-
-ssize_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);
 
-ssize_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);
-}
-
 /**
  * report_iommu_fault() - report about an IOMMU fault to the IOMMU framework
  * @domain: the iommu domain where the fault has happened
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index 521cd79700f4d8..d5c16dc33c87de 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -474,10 +474,8 @@ extern size_t iommu_unmap_fast(struct iommu_domain *domain,
 			       unsigned long iova, size_t size,
 			       struct iommu_iotlb_gather *iotlb_gather);
 extern ssize_t iommu_map_sg(struct iommu_domain *domain, unsigned long iova,
-		struct scatterlist *sg, unsigned int nents, int prot);
-extern ssize_t iommu_map_sg_atomic(struct iommu_domain *domain,
-				   unsigned long iova, struct scatterlist *sg,
-				   unsigned int nents, int prot);
+			    struct scatterlist *sg, unsigned int nents,
+			    int prot, gfp_t gfp);
 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);
@@ -791,14 +789,7 @@ static inline size_t iommu_unmap_fast(struct iommu_domain *domain,
 
 static inline ssize_t iommu_map_sg(struct iommu_domain *domain,
 				   unsigned long iova, struct scatterlist *sg,
-				   unsigned int nents, int prot)
-{
-	return -ENODEV;
-}
-
-static inline ssize_t iommu_map_sg_atomic(struct iommu_domain *domain,
-				  unsigned long iova, struct scatterlist *sg,
-				  unsigned int nents, int prot)
+				   unsigned int nents, int prot, gfp_t gfp)
 {
 	return -ENODEV;
 }
@@ -1109,7 +1100,8 @@ iommu_get_domain_for_dev_pasid(struct device *dev, ioasid_t pasid,
 static inline size_t iommu_map_sgtable(struct iommu_domain *domain,
 			unsigned long iova, struct sg_table *sgt, int prot)
 {
-	return iommu_map_sg(domain, iova, sgt->sgl, sgt->orig_nents, prot);
+	return iommu_map_sg(domain, iova, sgt->sgl, sgt->orig_nents, prot,
+			    GFP_KERNEL);
 }
 
 #ifdef CONFIG_IOMMU_DEBUGFS
-- 
2.39.0


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[PATCH v3 04/10] iommu/dma: Use the gfp parameter in __iommu_dma_alloc_noncontiguous()

[Jason Gunthorpe]

This function does an allocation of a buffer to return to the caller and
then goes on to allocate some internal memory, eg the scatterlist and
IOPTEs.

Instead of hard wiring GFP_KERNEL and a wrong GFP_ATOMIC, continue to use
the passed in gfp flags for all of the allocations. Clear the zone and
policy bits that are only relevant for the buffer allocation before
re-using them for internal allocations.

Auditing says this is never called from an atomic context, so the
GFP_ATOMIC is the incorrect flag.

Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
---
 drivers/iommu/dma-iommu.c | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c
index 72cfa24503b8bc..c99e4bc55d8cb0 100644
--- a/drivers/iommu/dma-iommu.c
+++ b/drivers/iommu/dma-iommu.c
@@ -822,7 +822,14 @@ static struct page **__iommu_dma_alloc_noncontiguous(struct device *dev,
 	if (!iova)
 		goto out_free_pages;
 
-	if (sg_alloc_table_from_pages(sgt, pages, count, 0, size, GFP_KERNEL))
+	/*
+	 * Remove the zone/policy flags from the GFP - these are applied to the
+	 * __iommu_dma_alloc_pages() but are not used for the supporting
+	 * internal allocations that follow.
+	 */
+	gfp &= ~(__GFP_DMA | __GFP_DMA32 | __GFP_HIGHMEM | __GFP_COMP);
+
+	if (sg_alloc_table_from_pages(sgt, pages, count, 0, size, gfp))
 		goto out_free_iova;
 
 	if (!(ioprot & IOMMU_CACHE)) {
@@ -834,7 +841,7 @@ static struct page **__iommu_dma_alloc_noncontiguous(struct device *dev,
 	}
 
 	ret = iommu_map_sg(domain, iova, sgt->sgl, sgt->orig_nents, ioprot,
-			   GFP_ATOMIC);
+			   gfp);
 	if (ret < 0 || ret < size)
 		goto out_free_sg;
 
-- 
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[PATCH v3 05/10] iommufd: Use GFP_KERNEL_ACCOUNT for iommu_map()

[Jason Gunthorpe]

iommufd follows the same design as KVM and uses memory cgroups to limit
the amount of kernel memory a iommufd file descriptor can pin down. The
various internal data structures already use GFP_KERNEL_ACCOUNT.

However, one of the biggest consumers of kernel memory is the IOPTEs
stored under the iommu_domain. Many drivers will allocate these at
iommu_map() time and will trivially do the right thing if we pass in
GFP_KERNEL_ACCOUNT.

Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
---
 drivers/iommu/iommufd/pages.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/iommu/iommufd/pages.c b/drivers/iommu/iommufd/pages.c
index 22cc3bb0c6c55a..f8d92c9bb65b60 100644
--- a/drivers/iommu/iommufd/pages.c
+++ b/drivers/iommu/iommufd/pages.c
@@ -457,7 +457,7 @@ static int batch_iommu_map_small(struct iommu_domain *domain,
 
 	while (size) {
 		rc = iommu_map(domain, iova, paddr, PAGE_SIZE, prot,
-			       GFP_KERNEL);
+			       GFP_KERNEL_ACCOUNT);
 		if (rc)
 			goto err_unmap;
 		iova += PAGE_SIZE;
@@ -502,7 +502,7 @@ static int batch_to_domain(struct pfn_batch *batch, struct iommu_domain *domain,
 			rc = iommu_map(domain, iova,
 				       PFN_PHYS(batch->pfns[cur]) + page_offset,
 				       next_iova - iova, area->iommu_prot,
-				       GFP_KERNEL);
+				       GFP_KERNEL_ACCOUNT);
 		if (rc)
 			goto err_unmap;
 		iova = next_iova;
-- 
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[PATCH v3 06/10] iommu/intel: Add a gfp parameter to alloc_pgtable_page()

[Jason Gunthorpe]

This is eventually called by iommufd through intel_iommu_map_pages() and
it should not be forced to atomic. Push the GFP_ATOMIC to all callers.

Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
---
 drivers/iommu/intel/iommu.c | 14 +++++++-------
 drivers/iommu/intel/iommu.h |  2 +-
 drivers/iommu/intel/pasid.c |  2 +-
 3 files changed, 9 insertions(+), 9 deletions(-)

diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
index 59df7e42fd533c..aa29561d3549b3 100644
--- a/drivers/iommu/intel/iommu.c
+++ b/drivers/iommu/intel/iommu.c
@@ -362,12 +362,12 @@ static int __init intel_iommu_setup(char *str)
 }
 __setup("intel_iommu=", intel_iommu_setup);
 
-void *alloc_pgtable_page(int node)
+void *alloc_pgtable_page(int node, gfp_t gfp)
 {
 	struct page *page;
 	void *vaddr = NULL;
 
-	page = alloc_pages_node(node, GFP_ATOMIC | __GFP_ZERO, 0);
+	page = alloc_pages_node(node, gfp | __GFP_ZERO, 0);
 	if (page)
 		vaddr = page_address(page);
 	return vaddr;
@@ -612,7 +612,7 @@ struct context_entry *iommu_context_addr(struct intel_iommu *iommu, u8 bus,
 		if (!alloc)
 			return NULL;
 
-		context = alloc_pgtable_page(iommu->node);
+		context = alloc_pgtable_page(iommu->node, GFP_ATOMIC);
 		if (!context)
 			return NULL;
 
@@ -935,7 +935,7 @@ static struct dma_pte *pfn_to_dma_pte(struct dmar_domain *domain,
 		if (!dma_pte_present(pte)) {
 			uint64_t pteval;
 
-			tmp_page = alloc_pgtable_page(domain->nid);
+			tmp_page = alloc_pgtable_page(domain->nid, GFP_ATOMIC);
 
 			if (!tmp_page)
 				return NULL;
@@ -1186,7 +1186,7 @@ static int iommu_alloc_root_entry(struct intel_iommu *iommu)
 {
 	struct root_entry *root;
 
-	root = (struct root_entry *)alloc_pgtable_page(iommu->node);
+	root = (struct root_entry *)alloc_pgtable_page(iommu->node, GFP_ATOMIC);
 	if (!root) {
 		pr_err("Allocating root entry for %s failed\n",
 			iommu->name);
@@ -2676,7 +2676,7 @@ static int copy_context_table(struct intel_iommu *iommu,
 			if (!old_ce)
 				goto out;
 
-			new_ce = alloc_pgtable_page(iommu->node);
+			new_ce = alloc_pgtable_page(iommu->node, GFP_ATOMIC);
 			if (!new_ce)
 				goto out_unmap;
 
@@ -4136,7 +4136,7 @@ static int md_domain_init(struct dmar_domain *domain, int guest_width)
 	domain->max_addr = 0;
 
 	/* always allocate the top pgd */
-	domain->pgd = alloc_pgtable_page(domain->nid);
+	domain->pgd = alloc_pgtable_page(domain->nid, GFP_ATOMIC);
 	if (!domain->pgd)
 		return -ENOMEM;
 	domain_flush_cache(domain, domain->pgd, PAGE_SIZE);
diff --git a/drivers/iommu/intel/iommu.h b/drivers/iommu/intel/iommu.h
index 06e61e4748567a..ca9a035e0110af 100644
--- a/drivers/iommu/intel/iommu.h
+++ b/drivers/iommu/intel/iommu.h
@@ -737,7 +737,7 @@ int qi_submit_sync(struct intel_iommu *iommu, struct qi_desc *desc,
 
 extern int dmar_ir_support(void);
 
-void *alloc_pgtable_page(int node);
+void *alloc_pgtable_page(int node, gfp_t gfp);
 void free_pgtable_page(void *vaddr);
 void iommu_flush_write_buffer(struct intel_iommu *iommu);
 struct intel_iommu *device_to_iommu(struct device *dev, u8 *bus, u8 *devfn);
diff --git a/drivers/iommu/intel/pasid.c b/drivers/iommu/intel/pasid.c
index fb3c7020028d07..c5bf74e9372d62 100644
--- a/drivers/iommu/intel/pasid.c
+++ b/drivers/iommu/intel/pasid.c
@@ -200,7 +200,7 @@ static struct pasid_entry *intel_pasid_get_entry(struct device *dev, u32 pasid)
 retry:
 	entries = get_pasid_table_from_pde(&dir[dir_index]);
 	if (!entries) {
-		entries = alloc_pgtable_page(info->iommu->node);
+		entries = alloc_pgtable_page(info->iommu->node, GFP_ATOMIC);
 		if (!entries)
 			return NULL;
 
-- 
2.39.0


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[PATCH v3 07/10] iommu/intel: Support the gfp argument to the map_pages op

[Jason Gunthorpe]

Flow it down to alloc_pgtable_page() via pfn_to_dma_pte() and
__domain_mapping().

Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
---
 drivers/iommu/intel/iommu.c | 24 +++++++++++++++---------
 1 file changed, 15 insertions(+), 9 deletions(-)

diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
index aa29561d3549b3..e95f7703ce7b83 100644
--- a/drivers/iommu/intel/iommu.c
+++ b/drivers/iommu/intel/iommu.c
@@ -908,7 +908,8 @@ void dmar_fault_dump_ptes(struct intel_iommu *iommu, u16 source_id,
 #endif
 
 static struct dma_pte *pfn_to_dma_pte(struct dmar_domain *domain,
-				      unsigned long pfn, int *target_level)
+				      unsigned long pfn, int *target_level,
+				      gfp_t gfp)
 {
 	struct dma_pte *parent, *pte;
 	int level = agaw_to_level(domain->agaw);
@@ -935,7 +936,7 @@ static struct dma_pte *pfn_to_dma_pte(struct dmar_domain *domain,
 		if (!dma_pte_present(pte)) {
 			uint64_t pteval;
 
-			tmp_page = alloc_pgtable_page(domain->nid, GFP_ATOMIC);
+			tmp_page = alloc_pgtable_page(domain->nid, gfp);
 
 			if (!tmp_page)
 				return NULL;
@@ -2150,7 +2151,8 @@ static void switch_to_super_page(struct dmar_domain *domain,
 
 	while (start_pfn <= end_pfn) {
 		if (!pte)
-			pte = pfn_to_dma_pte(domain, start_pfn, &level);
+			pte = pfn_to_dma_pte(domain, start_pfn, &level,
+					     GFP_ATOMIC);
 
 		if (dma_pte_present(pte)) {
 			dma_pte_free_pagetable(domain, start_pfn,
@@ -2172,7 +2174,8 @@ static void switch_to_super_page(struct dmar_domain *domain,
 
 static int
 __domain_mapping(struct dmar_domain *domain, unsigned long iov_pfn,
-		 unsigned long phys_pfn, unsigned long nr_pages, int prot)
+		 unsigned long phys_pfn, unsigned long nr_pages, int prot,
+		 gfp_t gfp)
 {
 	struct dma_pte *first_pte = NULL, *pte = NULL;
 	unsigned int largepage_lvl = 0;
@@ -2202,7 +2205,8 @@ __domain_mapping(struct dmar_domain *domain, unsigned long iov_pfn,
 			largepage_lvl = hardware_largepage_caps(domain, iov_pfn,
 					phys_pfn, nr_pages);
 
-			pte = pfn_to_dma_pte(domain, iov_pfn, &largepage_lvl);
+			pte = pfn_to_dma_pte(domain, iov_pfn, &largepage_lvl,
+					     gfp);
 			if (!pte)
 				return -ENOMEM;
 			first_pte = pte;
@@ -2368,7 +2372,7 @@ static int iommu_domain_identity_map(struct dmar_domain *domain,
 
 	return __domain_mapping(domain, first_vpfn,
 				first_vpfn, last_vpfn - first_vpfn + 1,
-				DMA_PTE_READ|DMA_PTE_WRITE);
+				DMA_PTE_READ|DMA_PTE_WRITE, GFP_ATOMIC);
 }
 
 static int md_domain_init(struct dmar_domain *domain, int guest_width);
@@ -4298,7 +4302,7 @@ static int intel_iommu_map(struct iommu_domain *domain,
 	   the low bits of hpa would take us onto the next page */
 	size = aligned_nrpages(hpa, size);
 	return __domain_mapping(dmar_domain, iova >> VTD_PAGE_SHIFT,
-				hpa >> VTD_PAGE_SHIFT, size, prot);
+				hpa >> VTD_PAGE_SHIFT, size, prot, gfp);
 }
 
 static int intel_iommu_map_pages(struct iommu_domain *domain,
@@ -4333,7 +4337,8 @@ static size_t intel_iommu_unmap(struct iommu_domain *domain,
 
 	/* Cope with horrid API which requires us to unmap more than the
 	   size argument if it happens to be a large-page mapping. */
-	BUG_ON(!pfn_to_dma_pte(dmar_domain, iova >> VTD_PAGE_SHIFT, &level));
+	BUG_ON(!pfn_to_dma_pte(dmar_domain, iova >> VTD_PAGE_SHIFT, &level,
+			       GFP_ATOMIC));
 
 	if (size < VTD_PAGE_SIZE << level_to_offset_bits(level))
 		size = VTD_PAGE_SIZE << level_to_offset_bits(level);
@@ -4392,7 +4397,8 @@ static phys_addr_t intel_iommu_iova_to_phys(struct iommu_domain *domain,
 	int level = 0;
 	u64 phys = 0;
 
-	pte = pfn_to_dma_pte(dmar_domain, iova >> VTD_PAGE_SHIFT, &level);
+	pte = pfn_to_dma_pte(dmar_domain, iova >> VTD_PAGE_SHIFT, &level,
+			     GFP_ATOMIC);
 	if (pte && dma_pte_present(pte))
 		phys = dma_pte_addr(pte) +
 			(iova & (BIT_MASK(level_to_offset_bits(level) +
-- 
2.39.0


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[PATCH v3 08/10] iommu/intel: Use GFP_KERNEL in sleepable contexts

[Jason Gunthorpe]

These contexts are sleepable, so use the proper annotation. The GFP_ATOMIC
was added mechanically in the prior patches.

Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
---
 drivers/iommu/intel/iommu.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
index e95f7703ce7b83..a1a66798e1f06c 100644
--- a/drivers/iommu/intel/iommu.c
+++ b/drivers/iommu/intel/iommu.c
@@ -2372,7 +2372,7 @@ static int iommu_domain_identity_map(struct dmar_domain *domain,
 
 	return __domain_mapping(domain, first_vpfn,
 				first_vpfn, last_vpfn - first_vpfn + 1,
-				DMA_PTE_READ|DMA_PTE_WRITE, GFP_ATOMIC);
+				DMA_PTE_READ|DMA_PTE_WRITE, GFP_KERNEL);
 }
 
 static int md_domain_init(struct dmar_domain *domain, int guest_width);
@@ -2680,7 +2680,7 @@ static int copy_context_table(struct intel_iommu *iommu,
 			if (!old_ce)
 				goto out;
 
-			new_ce = alloc_pgtable_page(iommu->node, GFP_ATOMIC);
+			new_ce = alloc_pgtable_page(iommu->node, GFP_KERNEL);
 			if (!new_ce)
 				goto out_unmap;
 
-- 
2.39.0


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[PATCH v3 09/10] iommu/s390: Push the gfp parameter to the kmem_cache_alloc()'s

[Jason Gunthorpe]

dma_alloc_cpu_table() and dma_alloc_page_table() are eventually called by
iommufd through s390_iommu_map_pages() and it should not be forced to
atomic. Thread the gfp parameter through the call chain starting from
s390_iommu_map_pages().

Reviewed-by: Niklas Schnelle <schnelle@linux.ibm.com>
Reviewed-by: Matthew Rosato <mjrosato@linux.ibm.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
---
 arch/s390/include/asm/pci_dma.h |  5 +++--
 arch/s390/pci/pci_dma.c         | 31 +++++++++++++++++--------------
 drivers/iommu/s390-iommu.c      | 15 +++++++++------
 3 files changed, 29 insertions(+), 22 deletions(-)

diff --git a/arch/s390/include/asm/pci_dma.h b/arch/s390/include/asm/pci_dma.h
index 91e63426bdc53f..7119c04c51c5c8 100644
--- a/arch/s390/include/asm/pci_dma.h
+++ b/arch/s390/include/asm/pci_dma.h
@@ -186,9 +186,10 @@ static inline unsigned long *get_st_pto(unsigned long entry)
 
 /* Prototypes */
 void dma_free_seg_table(unsigned long);
-unsigned long *dma_alloc_cpu_table(void);
+unsigned long *dma_alloc_cpu_table(gfp_t gfp);
 void dma_cleanup_tables(unsigned long *);
-unsigned long *dma_walk_cpu_trans(unsigned long *rto, dma_addr_t dma_addr);
+unsigned long *dma_walk_cpu_trans(unsigned long *rto, dma_addr_t dma_addr,
+				  gfp_t gfp);
 void dma_update_cpu_trans(unsigned long *entry, phys_addr_t page_addr, int flags);
 
 extern const struct dma_map_ops s390_pci_dma_ops;
diff --git a/arch/s390/pci/pci_dma.c b/arch/s390/pci/pci_dma.c
index ea478d11fbd132..2f6d05d6da4f76 100644
--- a/arch/s390/pci/pci_dma.c
+++ b/arch/s390/pci/pci_dma.c
@@ -27,11 +27,11 @@ static int zpci_refresh_global(struct zpci_dev *zdev)
 				  zdev->iommu_pages * PAGE_SIZE);
 }
 
-unsigned long *dma_alloc_cpu_table(void)
+unsigned long *dma_alloc_cpu_table(gfp_t gfp)
 {
 	unsigned long *table, *entry;
 
-	table = kmem_cache_alloc(dma_region_table_cache, GFP_ATOMIC);
+	table = kmem_cache_alloc(dma_region_table_cache, gfp);
 	if (!table)
 		return NULL;
 
@@ -45,11 +45,11 @@ static void dma_free_cpu_table(void *table)
 	kmem_cache_free(dma_region_table_cache, table);
 }
 
-static unsigned long *dma_alloc_page_table(void)
+static unsigned long *dma_alloc_page_table(gfp_t gfp)
 {
 	unsigned long *table, *entry;
 
-	table = kmem_cache_alloc(dma_page_table_cache, GFP_ATOMIC);
+	table = kmem_cache_alloc(dma_page_table_cache, gfp);
 	if (!table)
 		return NULL;
 
@@ -63,7 +63,7 @@ static void dma_free_page_table(void *table)
 	kmem_cache_free(dma_page_table_cache, table);
 }
 
-static unsigned long *dma_get_seg_table_origin(unsigned long *rtep)
+static unsigned long *dma_get_seg_table_origin(unsigned long *rtep, gfp_t gfp)
 {
 	unsigned long old_rte, rte;
 	unsigned long *sto;
@@ -72,7 +72,7 @@ static unsigned long *dma_get_seg_table_origin(unsigned long *rtep)
 	if (reg_entry_isvalid(rte)) {
 		sto = get_rt_sto(rte);
 	} else {
-		sto = dma_alloc_cpu_table();
+		sto = dma_alloc_cpu_table(gfp);
 		if (!sto)
 			return NULL;
 
@@ -90,7 +90,7 @@ static unsigned long *dma_get_seg_table_origin(unsigned long *rtep)
 	return sto;
 }
 
-static unsigned long *dma_get_page_table_origin(unsigned long *step)
+static unsigned long *dma_get_page_table_origin(unsigned long *step, gfp_t gfp)
 {
 	unsigned long old_ste, ste;
 	unsigned long *pto;
@@ -99,7 +99,7 @@ static unsigned long *dma_get_page_table_origin(unsigned long *step)
 	if (reg_entry_isvalid(ste)) {
 		pto = get_st_pto(ste);
 	} else {
-		pto = dma_alloc_page_table();
+		pto = dma_alloc_page_table(gfp);
 		if (!pto)
 			return NULL;
 		set_st_pto(&ste, virt_to_phys(pto));
@@ -116,18 +116,19 @@ static unsigned long *dma_get_page_table_origin(unsigned long *step)
 	return pto;
 }
 
-unsigned long *dma_walk_cpu_trans(unsigned long *rto, dma_addr_t dma_addr)
+unsigned long *dma_walk_cpu_trans(unsigned long *rto, dma_addr_t dma_addr,
+				  gfp_t gfp)
 {
 	unsigned long *sto, *pto;
 	unsigned int rtx, sx, px;
 
 	rtx = calc_rtx(dma_addr);
-	sto = dma_get_seg_table_origin(&rto[rtx]);
+	sto = dma_get_seg_table_origin(&rto[rtx], gfp);
 	if (!sto)
 		return NULL;
 
 	sx = calc_sx(dma_addr);
-	pto = dma_get_page_table_origin(&sto[sx]);
+	pto = dma_get_page_table_origin(&sto[sx], gfp);
 	if (!pto)
 		return NULL;
 
@@ -170,7 +171,8 @@ static int __dma_update_trans(struct zpci_dev *zdev, phys_addr_t pa,
 		return -EINVAL;
 
 	for (i = 0; i < nr_pages; i++) {
-		entry = dma_walk_cpu_trans(zdev->dma_table, dma_addr);
+		entry = dma_walk_cpu_trans(zdev->dma_table, dma_addr,
+					   GFP_ATOMIC);
 		if (!entry) {
 			rc = -ENOMEM;
 			goto undo_cpu_trans;
@@ -186,7 +188,8 @@ static int __dma_update_trans(struct zpci_dev *zdev, phys_addr_t pa,
 		while (i-- > 0) {
 			page_addr -= PAGE_SIZE;
 			dma_addr -= PAGE_SIZE;
-			entry = dma_walk_cpu_trans(zdev->dma_table, dma_addr);
+			entry = dma_walk_cpu_trans(zdev->dma_table, dma_addr,
+						   GFP_ATOMIC);
 			if (!entry)
 				break;
 			dma_update_cpu_trans(entry, page_addr, flags);
@@ -576,7 +579,7 @@ int zpci_dma_init_device(struct zpci_dev *zdev)
 
 	spin_lock_init(&zdev->iommu_bitmap_lock);
 
-	zdev->dma_table = dma_alloc_cpu_table();
+	zdev->dma_table = dma_alloc_cpu_table(GFP_ATOMIC);
 	if (!zdev->dma_table) {
 		rc = -ENOMEM;
 		goto out;
diff --git a/drivers/iommu/s390-iommu.c b/drivers/iommu/s390-iommu.c
index ed33c6cce08362..654ec4411fe36c 100644
--- a/drivers/iommu/s390-iommu.c
+++ b/drivers/iommu/s390-iommu.c
@@ -52,7 +52,7 @@ static struct iommu_domain *s390_domain_alloc(unsigned domain_type)
 	if (!s390_domain)
 		return NULL;
 
-	s390_domain->dma_table = dma_alloc_cpu_table();
+	s390_domain->dma_table = dma_alloc_cpu_table(GFP_ATOMIC);
 	if (!s390_domain->dma_table) {
 		kfree(s390_domain);
 		return NULL;
@@ -260,7 +260,8 @@ static void s390_iommu_iotlb_sync_map(struct iommu_domain *domain,
 
 static int s390_iommu_validate_trans(struct s390_domain *s390_domain,
 				     phys_addr_t pa, dma_addr_t dma_addr,
-				     unsigned long nr_pages, int flags)
+				     unsigned long nr_pages, int flags,
+				     gfp_t gfp)
 {
 	phys_addr_t page_addr = pa & PAGE_MASK;
 	unsigned long *entry;
@@ -268,7 +269,8 @@ static int s390_iommu_validate_trans(struct s390_domain *s390_domain,
 	int rc;
 
 	for (i = 0; i < nr_pages; i++) {
-		entry = dma_walk_cpu_trans(s390_domain->dma_table, dma_addr);
+		entry = dma_walk_cpu_trans(s390_domain->dma_table, dma_addr,
+					   gfp);
 		if (unlikely(!entry)) {
 			rc = -ENOMEM;
 			goto undo_cpu_trans;
@@ -284,7 +286,7 @@ static int s390_iommu_validate_trans(struct s390_domain *s390_domain,
 	while (i-- > 0) {
 		dma_addr -= PAGE_SIZE;
 		entry = dma_walk_cpu_trans(s390_domain->dma_table,
-					   dma_addr);
+					   dma_addr, gfp);
 		if (!entry)
 			break;
 		dma_update_cpu_trans(entry, 0, ZPCI_PTE_INVALID);
@@ -301,7 +303,8 @@ static int s390_iommu_invalidate_trans(struct s390_domain *s390_domain,
 	int rc = 0;
 
 	for (i = 0; i < nr_pages; i++) {
-		entry = dma_walk_cpu_trans(s390_domain->dma_table, dma_addr);
+		entry = dma_walk_cpu_trans(s390_domain->dma_table, dma_addr,
+					   GFP_ATOMIC);
 		if (unlikely(!entry)) {
 			rc = -EINVAL;
 			break;
@@ -339,7 +342,7 @@ static int s390_iommu_map_pages(struct iommu_domain *domain,
 		flags |= ZPCI_TABLE_PROTECTED;
 
 	rc = s390_iommu_validate_trans(s390_domain, paddr, iova,
-				       pgcount, flags);
+				       pgcount, flags, gfp);
 	if (!rc)
 		*mapped = size;
 
-- 
2.39.0


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[PATCH v3 10/10] iommu/s390: Use GFP_KERNEL in sleepable contexts

[Jason Gunthorpe]

These contexts are sleepable, so use the proper annotation. The GFP_ATOMIC
was added mechanically in the prior patches.

Reviewed-by: Niklas Schnelle <schnelle@linux.ibm.com>
Reviewed-by: Matthew Rosato <mjrosato@linux.ibm.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
---
 arch/s390/pci/pci_dma.c    | 2 +-
 drivers/iommu/s390-iommu.c | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/s390/pci/pci_dma.c b/arch/s390/pci/pci_dma.c
index 2f6d05d6da4f76..2d9b01d7ca4c5c 100644
--- a/arch/s390/pci/pci_dma.c
+++ b/arch/s390/pci/pci_dma.c
@@ -579,7 +579,7 @@ int zpci_dma_init_device(struct zpci_dev *zdev)
 
 	spin_lock_init(&zdev->iommu_bitmap_lock);
 
-	zdev->dma_table = dma_alloc_cpu_table(GFP_ATOMIC);
+	zdev->dma_table = dma_alloc_cpu_table(GFP_KERNEL);
 	if (!zdev->dma_table) {
 		rc = -ENOMEM;
 		goto out;
diff --git a/drivers/iommu/s390-iommu.c b/drivers/iommu/s390-iommu.c
index 654ec4411fe36c..7dcfffed260e6b 100644
--- a/drivers/iommu/s390-iommu.c
+++ b/drivers/iommu/s390-iommu.c
@@ -52,7 +52,7 @@ static struct iommu_domain *s390_domain_alloc(unsigned domain_type)
 	if (!s390_domain)
 		return NULL;
 
-	s390_domain->dma_table = dma_alloc_cpu_table(GFP_ATOMIC);
+	s390_domain->dma_table = dma_alloc_cpu_table(GFP_KERNEL);
 	if (!s390_domain->dma_table) {
 		kfree(s390_domain);
 		return NULL;
-- 
2.39.0


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

[Mathieu Poirier]

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
> 

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Re: [PATCH v3 00/10] Let iommufd charge IOPTE allocations to the memory cgroup

[Joerg Roedel]

On Mon, Jan 23, 2023 at 04:35:53PM -0400, Jason Gunthorpe wrote:
> Jason Gunthorpe (10):
>   iommu: Add a gfp parameter to iommu_map()
>   iommu: Remove iommu_map_atomic()
>   iommu: Add a gfp parameter to iommu_map_sg()
>   iommu/dma: Use the gfp parameter in __iommu_dma_alloc_noncontiguous()
>   iommufd: Use GFP_KERNEL_ACCOUNT for iommu_map()
>   iommu/intel: Add a gfp parameter to alloc_pgtable_page()
>   iommu/intel: Support the gfp argument to the map_pages op
>   iommu/intel: Use GFP_KERNEL in sleepable contexts
>   iommu/s390: Push the gfp parameter to the kmem_cache_alloc()'s
>   iommu/s390: Use GFP_KERNEL in sleepable contexts

Merged into branch iommu-memory-accounting and merged that branch into
core.

The merge commit contains your cover-letter descriptions. Given all
tests pass I will push it out later today.

Regards,

	Joerg

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