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* [PATCH v2] powerpc/pseries/iommu: export DMA window data to user space
@ 2026-05-07 18:06 Gaurav Batra
  2026-05-08 17:04 ` Harsh Prateek Bora
                   ` (2 more replies)
  0 siblings, 3 replies; 5+ messages in thread
From: Gaurav Batra @ 2026-05-07 18:06 UTC (permalink / raw)
  To: maddy; +Cc: linuxppc-dev, sbhat, vaibhav, ritesh.list, Gaurav Batra,
	Brian King

Export PowerPC DMA window information (both default 2GB and Dynamic
larger window) to user space via sysfs. Each of these DMA windows has
attributes like size of the window, page size backing the window, mode,
etc. Each of these atributes is exported for user space consumption as a
file.

PowerPC Host Bridge (PHB) can have multiple devices/functions sharing
the same DMA window. For each PHB, iommu registration creates an iommu
device under "/sys/devices/virtual/iommu".

These devices will have 2 groups created to export Default and DDW
attributes.

Reviewed-by: Brian King <brking@linux.ibm.com>
Reviewed-by: Vaibhav Jain <vaibhav@linux.ibm.com>
Reviewed-by: Shivaprasad G Bhat <sbhat@linux.ibm.com>
Signed-off-by: Gaurav Batra <gbatra@linux.ibm.com>
---
V1 -> V2 change log:

1. Shiva: "weight" the it_map for the bitmap. This avoids using an extra
   counter in the table. Please look into how iommu_debugfs_weight_get()
   does this

   Response: Incorporated changes

2. Vaibhav: If the DMA window is not available, show function should just
   return ENOENT so that userspace know the error instantly instead of
   having to parse the sysfs contents.

   Response: Incorporated changes, returning ENODATA

3. Vaibhav: All the show functions have similar template. Please convert
   them to macros expansion to reduce code volume.

   Response: Incorporated changes

4. Vaibhav: These new attributes are PSeries specific but they are being
   setup in ppc generic iommu code at arch/powerpc/kernel/iommu.c. Can
   you move these attributes to arch/powerpc/platforms/pseries/iommu.c

   Response: I have split the attributes and moved them to pseries specific
   files. The original group "spapr-tce-iommu", is moved to PowerNV code
   base to retain the legacy functionality.

   I tested the changes both on Pseries and PowerNV.

5. Vaibhav: It would be better to use function iommu_table_inuse_tces() as
   a callback in iommu_table_ops which can be implemented by pseries and
   powernv code differently.

   Response: the function is no longer needed after changes in #1

6. Vaibhav: Since sysfs is ABI can you propose appropriate entries under
   Documentation/ABI/testing

   Response: Added documentation

 ...sfs-devices-virtual-iommu-dma_window_attrs |  21 ++
 .../arch/powerpc/dma_window_attributes.rst    |  65 +++++
 arch/powerpc/include/asm/pci-bridge.h         |   4 +
 arch/powerpc/kernel/iommu.c                   |  16 +-
 arch/powerpc/platforms/powernv/pci-ioda.c     |  16 ++
 arch/powerpc/platforms/pseries/iommu.c        | 261 ++++++++++++++++++
 arch/powerpc/platforms/pseries/pci_dlpar.c    |   2 +
 arch/powerpc/platforms/pseries/pseries.h      |   1 +
 arch/powerpc/platforms/pseries/setup.c        |   2 +
 9 files changed, 373 insertions(+), 15 deletions(-)
 create mode 100644 Documentation/ABI/testing/sysfs-devices-virtual-iommu-dma_window_attrs
 create mode 100644 Documentation/arch/powerpc/dma_window_attributes.rst

diff --git a/Documentation/ABI/testing/sysfs-devices-virtual-iommu-dma_window_attrs b/Documentation/ABI/testing/sysfs-devices-virtual-iommu-dma_window_attrs
new file mode 100644
index 000000000000..18ba63874276
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-devices-virtual-iommu-dma_window_attrs
@@ -0,0 +1,21 @@
+What:       /sys/devices/virtual/iommu/<iommu-isolation>/spapr-tce-ddw/*
+Date:       Oct 2025
+Contact:    linuxppc-dev@lists.ozlabs.org
+Description:    read only
+    For each IOMMU isolation unit spapr-tce-ddw sub-directory provides
+    attributes to query information related to the bigger Dynamic DMA
+    window (DDW) in the PowerPC virtualized platforms.
+
+    See Documentation/arch/powerpc/dma_window_attributes.rst for more
+    information.
+
+What:       /sys/devices/virtual/iommu/<iommu-isolation>/spapr-tce-dma/*
+Date:       Oct 2025
+Contact:    linuxppc-dev@lists.ozlabs.org
+Description:    read only
+    For each IOMMU isolation unit spapr-tce-dma sub-directory provides
+    attributes to query information related to the default 2GB DMA
+    window in the PowerPC virtualized platforms.
+
+    See Documentation/arch/powerpc/dma_window_attributes.rst for more
+    information.
diff --git a/Documentation/arch/powerpc/dma_window_attributes.rst b/Documentation/arch/powerpc/dma_window_attributes.rst
new file mode 100644
index 000000000000..8bd9aec8539d
--- /dev/null
+++ b/Documentation/arch/powerpc/dma_window_attributes.rst
@@ -0,0 +1,65 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+=====================
+DMA Window Attributes
+=====================
+
+In PowerPC architecture there are 2 types of DMA windows -
+
+1. Default 2GB DMA window which is backed by 4K page size
+2. A bigger Dynamic DMA Window (DDW) which is backed by larger page size
+   (64K or 2MB)
+
+A dedicated device will have both the DMA windows instantiated but an SR-IOV
+device will only have the bigger Dynamic DMA Window.
+
+The attributes of these 2 DMA windows are exported to user space via sysfs.
+Each IOMMU isolation unit will have its directory created under
+/sys/devices/virtual/iommu.
+
+As an exapmple, iommu-phb0001
+
+Under each IOMMU isolation unit, there will be a group of attributes for
+"Default 2GB DMA Window" and "Dynamic DMA Window" - spapr-tce-dma and
+spapr-tce-ddw respectively.
+
+Attributes under each group
+
+spapr-tce-ddw:
+direct_address  dynamic_address       dynamic_size  window_type
+direct_size     dynamic_pages_mapped  page_size
+
+spapr-tce-dma:
+dynamic_address  dynamic_pages_mapped  dynamic_size  page_size
+
+
+The bigger Dynamic DMA Window is configured into pre-mapped and/or dynamically
+allocated TCEs. If the DDW is in "Hybrid" mode, then both the Direct
+(pre-mapped) and Dynamic part of the DMA window will have valid values. Hybrid
+mode is valid only for SR-IOV devices.
+
+DMA Window properties:
+
+direct_address              Starting address of the pre-mapped DMA window
+direct_size                 Size of the pre-mapped DMA Window
+dynamic_address             Starting address of the dynamic allocations
+dynamic_size                Size of the dynamic allocation window
+dynamic_pages_mapped        Pages mapped for DMA by dynamic allocations
+page_size                   Page size backing the DMA window
+window_type                 Type of the DMA Window (Direct/Dynamic/Hybrid)
+
+
+An example of DDW attributes for an SR-IOV device::
+
+    $ cd /sys/devices/virtual/iommu/iommu-phb0001/spapr-tce-ddw
+
+    $ grep . *
+
+    direct_address:0x800000000000000   <-- Starting addr of pre-mapped Window
+    direct_size:137438953472           <-- Size of pre-mapped Window (128GB)
+    dynamic_address:0x800002000000000  <-- Starting addr of Dynamic allocations
+    dynamic_size:412316860416          <-- Size of dynamic allocation window (384GB)
+    dynamic_pages_mapped:270           <-- Pages mapped by dynamic allocations
+    page_size:2097152                  <-- DMA window page size (2MB)
+    window_type:Hybrid                 <-- window has both pre-mapped and
+                                           dynamic sections
diff --git a/arch/powerpc/include/asm/pci-bridge.h b/arch/powerpc/include/asm/pci-bridge.h
index 1dae53130782..9b09178aca5e 100644
--- a/arch/powerpc/include/asm/pci-bridge.h
+++ b/arch/powerpc/include/asm/pci-bridge.h
@@ -124,6 +124,10 @@ struct pci_controller {
 	resource_size_t dma_window_base_cur;
 	resource_size_t dma_window_size;
 
+#if defined(CONFIG_PPC_PSERIES) || defined(CONFIG_PPC_POWERNV)
+	const struct attribute_group **iommu_groups;
+#endif
+
 #ifdef CONFIG_PPC64
 	unsigned long buid;
 	struct pci_dn *pci_data;
diff --git a/arch/powerpc/kernel/iommu.c b/arch/powerpc/kernel/iommu.c
index 0ce71310b7d9..d6242e3f77da 100644
--- a/arch/powerpc/kernel/iommu.c
+++ b/arch/powerpc/kernel/iommu.c
@@ -1269,24 +1269,10 @@ static const struct iommu_ops spapr_tce_iommu_ops = {
 	.device_group = spapr_tce_iommu_device_group,
 };
 
-static struct attribute *spapr_tce_iommu_attrs[] = {
-	NULL,
-};
-
-static struct attribute_group spapr_tce_iommu_group = {
-	.name = "spapr-tce-iommu",
-	.attrs = spapr_tce_iommu_attrs,
-};
-
-static const struct attribute_group *spapr_tce_iommu_groups[] = {
-	&spapr_tce_iommu_group,
-	NULL,
-};
-
 void ppc_iommu_register_device(struct pci_controller *phb)
 {
 	iommu_device_sysfs_add(&phb->iommu, phb->parent,
-				spapr_tce_iommu_groups, "iommu-phb%04x",
+				phb->iommu_groups, "iommu-phb%04x",
 				phb->global_number);
 	iommu_device_register(&phb->iommu, &spapr_tce_iommu_ops,
 				phb->parent);
diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c b/arch/powerpc/platforms/powernv/pci-ioda.c
index 1c78fdfb7b03..0887f154955e 100644
--- a/arch/powerpc/platforms/powernv/pci-ioda.c
+++ b/arch/powerpc/platforms/powernv/pci-ioda.c
@@ -2493,6 +2493,20 @@ static const struct pci_controller_ops pnv_npu_ocapi_ioda_controller_ops = {
 	.shutdown		= pnv_pci_ioda_shutdown,
 };
 
+static struct attribute *pnv_tce_iommu_attrs[] = {
+	NULL,
+};
+
+static struct attribute_group pnv_tce_iommu_group = {
+	.name = "spapr-tce-iommu",
+	.attrs = pnv_tce_iommu_attrs,
+};
+
+static const struct attribute_group *pnv_tce_iommu_groups[] = {
+	&pnv_tce_iommu_group,
+	NULL,
+};
+
 static void __init pnv_pci_init_ioda_phb(struct device_node *np,
 					 u64 hub_id, int ioda_type)
 {
@@ -2697,6 +2711,8 @@ static void __init pnv_pci_init_ioda_phb(struct device_node *np,
 		hose->controller_ops = pnv_pci_ioda_controller_ops;
 	}
 
+	hose->iommu_groups = pnv_tce_iommu_groups;
+
 	ppc_md.pcibios_default_alignment = pnv_pci_default_alignment;
 
 #ifdef CONFIG_PCI_IOV
diff --git a/arch/powerpc/platforms/pseries/iommu.c b/arch/powerpc/platforms/pseries/iommu.c
index 5497b130e026..28be7a45761d 100644
--- a/arch/powerpc/platforms/pseries/iommu.c
+++ b/arch/powerpc/platforms/pseries/iommu.c
@@ -56,6 +56,20 @@ enum {
 	DDW_EXT_LIMITED_ADDR_MODE = 3
 };
 
+/* used by sysfs when querying Dynamic/Default DMA Window data */
+struct dma_win_data {
+	u32     page_size;
+	u64     direct_address;
+	u64     direct_size;
+	u64     dynamic_address;
+	u64     dynamic_size;
+	u32     dynamic_pages_mapped;
+	char    window_type[15];
+};
+
+#define SPAPR_SUCCESS		0
+#define SPAPR_ERROR			-1
+
 static struct iommu_table *iommu_pseries_alloc_table(int node)
 {
 	struct iommu_table *tbl;
@@ -837,6 +851,253 @@ static struct device_node *pci_dma_find(struct device_node *dn,
 	return rdn;
 }
 
+/* Get DDW information for the device */
+static int gather_ddw_info(struct device *dev, struct dma_win_data *data)
+{
+	struct iommu_device *iommu;
+	struct pci_controller *phb;
+	struct device_node *dn;
+	struct pci_dn *pci;
+	const __be32 *prop = NULL;
+	bool ddw_direct = false;
+	bool found = false;
+	struct iommu_table *tbl;
+	u32 pgshift;
+	struct dynamic_dma_window_prop *p;
+
+	memset(data, 0, sizeof(*data));
+
+	iommu = dev_get_drvdata(dev);
+	phb = container_of(iommu, struct pci_controller, iommu);
+	dn = phb->dn;
+
+	if (!dn)
+		return SPAPR_ERROR;
+
+	pci = PCI_DN(dn);
+	if (!pci || !pci->table_group)
+		return SPAPR_ERROR;
+
+	/* Find DDW */
+	prop = of_get_property(dn, DIRECT64_PROPNAME, NULL);
+	if (prop) {
+		ddw_direct = true;
+		found = true;
+	} else {
+		prop = of_get_property(dn, DMA64_PROPNAME, NULL);
+		if (prop)
+			found = true;
+	}
+
+	/* NO DDW */
+	if (!found)
+		return SPAPR_ERROR;
+
+	p = (struct dynamic_dma_window_prop *)prop;
+
+	pgshift = be32_to_cpu(p->tce_shift);
+	if (pgshift != 0xc && pgshift != 0x10 && pgshift != 0x15)
+		data->page_size = 0;
+	else
+		data->page_size = 1 << pgshift;
+
+	/* Check if DDW has table associated with it. Having a table associated with
+	 * DDW is indicative that is has some dynamic TCE allocations. In this case the
+	 * DDW can be fully Dynamic or in Hybrid mode. For SR-IOV DDW is on index 0,
+	 * for dedicated adapter on index 1.
+	 */
+	found = false;
+	for (int i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) {
+		tbl = pci->table_group->tables[i];
+
+		if (tbl && tbl->it_index == be32_to_cpu(p->liobn)) {
+			found = true;
+			break;
+		}
+	}
+
+	/* set the parameters depnding on the DDW type */
+	if (ddw_direct && found) {          /* Hybrid */
+		data->direct_address = be64_to_cpu(p->dma_base);
+		data->dynamic_size = (u64)(tbl->it_size << tbl->it_page_shift);
+
+		data->dynamic_address = data->direct_address
+								+ (u64)(1UL << be32_to_cpu(p->window_shift))
+								- data->dynamic_size;
+
+		data->direct_size = data->dynamic_address - data->direct_address;
+		data->dynamic_pages_mapped = bitmap_weight(tbl->it_map, tbl->it_size);
+
+		sprintf(data->window_type, "%s", "Hybrid");
+	} else if (ddw_direct && !found) {    /* Direct */
+		data->direct_address = be64_to_cpu(p->dma_base);
+		data->direct_size = (u64)(1UL << be32_to_cpu(p->window_shift));
+
+		sprintf(data->window_type, "%s", "Direct");
+	} else {                              /* Dynamic */
+		data->dynamic_address = be64_to_cpu(p->dma_base);
+		data->dynamic_size = (u64)(1UL << be32_to_cpu(p->window_shift));
+		data->dynamic_pages_mapped = bitmap_weight(tbl->it_map, tbl->it_size);
+
+		sprintf(data->window_type, "%s", "Dynamic");
+	}
+
+	return SPAPR_SUCCESS;
+}
+
+/* Get DDW information for the device */
+static int gather_dma_info(struct device *dev, struct dma_win_data *data)
+{
+	struct iommu_device *iommu;
+	struct pci_controller *phb;
+	struct device_node *dn;
+	struct pci_dn *pci;
+	const __be32 *prop = NULL;
+	struct iommu_table *tbl;
+	unsigned long offset, size, liobn;
+
+	memset(data, 0, sizeof(*data));
+
+	iommu = dev_get_drvdata(dev);
+	phb = container_of(iommu, struct pci_controller, iommu);
+	dn = phb->dn;
+
+	if (!dn)
+		return SPAPR_ERROR;
+
+	pci = PCI_DN(dn);
+	if (!pci || !pci->table_group)
+		return SPAPR_ERROR;
+
+	/* search for default DMA window */
+	prop = of_get_property(dn, "ibm,dma-window", NULL);
+
+	if (!prop)
+		return SPAPR_ERROR;
+
+	/* default DMA Window is always at index 0 */
+	tbl = pci->table_group->tables[0];
+	if (!tbl)
+		return SPAPR_ERROR;
+
+	of_parse_dma_window(dn, prop, &liobn, &offset, &size);
+
+	data->dynamic_address = offset;
+	data->dynamic_size = size;
+	data->page_size = 1ULL << IOMMU_PAGE_SHIFT_4K;
+	data->dynamic_pages_mapped = bitmap_weight(tbl->it_map, tbl->it_size);
+
+	return SPAPR_SUCCESS;
+}
+
+#define DEVICE_SHOW_DDW(_name, _fmt)							\
+ssize_t ddw_##_name##_show(struct device *dev,					\
+								  struct device_attribute *attr,\
+								  char *buf)					\
+{																\
+	int rc = 0;													\
+	struct dma_win_data data;									\
+																\
+	rc = gather_ddw_info(dev, &data);							\
+																\
+	if (rc == SPAPR_SUCCESS)									\
+		return sysfs_emit(buf, _fmt, data._name);				\
+	else														\
+		return -ENODATA;										\
+}																\
+
+#define DEVICE_SHOW_DMA(_name, _fmt)							\
+ssize_t dma_##_name##_show(struct device *dev,					\
+								  struct device_attribute *attr,\
+								  char *buf)					\
+{																\
+	int rc = 0;													\
+	struct dma_win_data data;									\
+																\
+	rc = gather_dma_info(dev, &data);							\
+																\
+	if (rc == SPAPR_SUCCESS)									\
+		return sysfs_emit(buf, _fmt, data._name);				\
+	else														\
+		return -ENODATA;										\
+}																\
+
+static DEVICE_SHOW_DDW(direct_address, "%#llx\n");
+static DEVICE_SHOW_DDW(direct_size, "%lld\n");
+static DEVICE_SHOW_DDW(page_size, "%d\n");
+static DEVICE_SHOW_DDW(window_type, "%s\n");
+static DEVICE_SHOW_DDW(dynamic_address, "%#llx\n");
+static DEVICE_SHOW_DDW(dynamic_size, "%lld\n");
+static DEVICE_SHOW_DDW(dynamic_pages_mapped, "%d\n");
+static DEVICE_SHOW_DMA(dynamic_address, "%#llx\n");
+static DEVICE_SHOW_DMA(dynamic_size, "%lld\n");
+static DEVICE_SHOW_DMA(page_size, "%d\n");
+static DEVICE_SHOW_DMA(dynamic_pages_mapped, "%d\n");
+
+#define DEVICE_ATTR_DDW(_name)                              \
+		struct device_attribute dev_attr_ddw_##_name =      \
+			__ATTR(_name, 0444, ddw_##_name##_show, NULL)
+#define DEVICE_ATTR_DMA(_name)                              \
+		struct device_attribute dev_attr_dma_##_name =      \
+		__ATTR(_name, 0444, dma_##_name##_show, NULL)
+
+static DEVICE_ATTR_DDW(direct_address);
+static DEVICE_ATTR_DDW(direct_size);
+static DEVICE_ATTR_DDW(page_size);
+static DEVICE_ATTR_DDW(window_type);
+static DEVICE_ATTR_DDW(dynamic_address);
+static DEVICE_ATTR_DDW(dynamic_size);
+static DEVICE_ATTR_DDW(dynamic_pages_mapped);
+static DEVICE_ATTR_DMA(dynamic_address);
+static DEVICE_ATTR_DMA(dynamic_size);
+static DEVICE_ATTR_DMA(page_size);
+static DEVICE_ATTR_DMA(dynamic_pages_mapped);
+
+static struct attribute *spapr_tce_ddw_attrs[] = {
+	&dev_attr_ddw_direct_address.attr,
+	&dev_attr_ddw_direct_size.attr,
+	&dev_attr_ddw_page_size.attr,
+	&dev_attr_ddw_window_type.attr,
+	&dev_attr_ddw_dynamic_address.attr,
+	&dev_attr_ddw_dynamic_size.attr,
+	&dev_attr_ddw_dynamic_pages_mapped.attr,
+	NULL,
+};
+
+static struct attribute *spapr_tce_dma_attrs[] = {
+	&dev_attr_dma_dynamic_address.attr,
+	&dev_attr_dma_dynamic_size.attr,
+	&dev_attr_dma_page_size.attr,
+	&dev_attr_dma_dynamic_pages_mapped.attr,
+	NULL,
+};
+
+static struct attribute_group spapr_tce_ddw_group = {
+	.name = "spapr-tce-ddw",
+	.attrs = spapr_tce_ddw_attrs,
+};
+
+static struct attribute_group spapr_tce_dma_group = {
+	.name = "spapr-tce-dma",
+	.attrs = spapr_tce_dma_attrs,
+};
+
+static struct attribute *spapr_tce_iommu_attrs[] = {
+	NULL,
+};
+
+static struct attribute_group spapr_tce_iommu_group = {
+	.name = "spapr-tce-iommu",
+	.attrs = spapr_tce_iommu_attrs,
+};
+
+const struct attribute_group *spapr_tce_iommu_groups[] = {
+	&spapr_tce_iommu_group,
+	&spapr_tce_ddw_group,
+	&spapr_tce_dma_group,
+	NULL,
+};
+
 static void pci_dma_bus_setup_pSeriesLP(struct pci_bus *bus)
 {
 	struct iommu_table *tbl;
diff --git a/arch/powerpc/platforms/pseries/pci_dlpar.c b/arch/powerpc/platforms/pseries/pci_dlpar.c
index 8c77ec7980de..b457451a2814 100644
--- a/arch/powerpc/platforms/pseries/pci_dlpar.c
+++ b/arch/powerpc/platforms/pseries/pci_dlpar.c
@@ -45,6 +45,8 @@ struct pci_controller *init_phb_dynamic(struct device_node *dn)
 	pci_process_bridge_OF_ranges(phb, dn, 0);
 	phb->controller_ops = pseries_pci_controller_ops;
 
+	phb->iommu_groups = spapr_tce_iommu_groups;
+
 	pci_devs_phb_init_dynamic(phb);
 
 	pseries_msi_allocate_domains(phb);
diff --git a/arch/powerpc/platforms/pseries/pseries.h b/arch/powerpc/platforms/pseries/pseries.h
index 3968a6970fa8..4cf0b7a4e96a 100644
--- a/arch/powerpc/platforms/pseries/pseries.h
+++ b/arch/powerpc/platforms/pseries/pseries.h
@@ -128,4 +128,5 @@ struct iommu_group *pSeries_pci_device_group(struct pci_controller *hose,
 					     struct pci_dev *pdev);
 #endif
 
+extern const struct attribute_group *spapr_tce_iommu_groups[];
 #endif /* _PSERIES_PSERIES_H */
diff --git a/arch/powerpc/platforms/pseries/setup.c b/arch/powerpc/platforms/pseries/setup.c
index 50b26ed8432d..4d877aae0560 100644
--- a/arch/powerpc/platforms/pseries/setup.c
+++ b/arch/powerpc/platforms/pseries/setup.c
@@ -512,6 +512,8 @@ static void __init pSeries_discover_phbs(void)
 		isa_bridge_find_early(phb);
 		phb->controller_ops = pseries_pci_controller_ops;
 
+		phb->iommu_groups = spapr_tce_iommu_groups;
+
 		/* create pci_dn's for DT nodes under this PHB */
 		pci_devs_phb_init_dynamic(phb);
 
base-commit: 192c0159402e6bfbe13de6f8379546943297783d
-- 
2.39.3



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2026-05-07 18:06 [PATCH v2] powerpc/pseries/iommu: export DMA window data to user space Gaurav Batra
2026-05-08 17:04 ` Harsh Prateek Bora
2026-06-08 16:56   ` Gaurav Batra
2026-05-10 16:15 ` kernel test robot
2026-05-13  7:10 ` Vaibhav Jain

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