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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH 12/13] acpi: arm: Provide support for iort iommu configuration hooks
From: Manish Jaggi <mjaggi@xxxxxxxxxxxxxxxxxx>
This patch copies the basic code from linux (iort.c) required to parse
IORT and
hooks for iommu configuration and initializes smmu device.
Provides a top level initcall acpi_iort_init which would call
parse_iort (next patch) to parse and prepare the rid-devid and rid-sid
maps.
This patch is dependent on next patch. The code is cleanly split into
two patches
Signed-off-by: Manish Jaggi <manish.jaggi@xxxxxxxxxx>
---
xen/arch/arm/acpi/Makefile | 1 +
xen/arch/arm/acpi/iort.c | 401 +++++++++++++++++++++++++++++++++++++++++++
xen/include/asm-arm/device.h | 12 +-
3 files changed, 413 insertions(+), 1 deletion(-)
diff --git a/xen/arch/arm/acpi/Makefile b/xen/arch/arm/acpi/Makefile
index 073339603c..a596559205 100644
--- a/xen/arch/arm/acpi/Makefile
+++ b/xen/arch/arm/acpi/Makefile
@@ -2,3 +2,4 @@ obj-y += lib.o
obj-y += boot.init.o
obj-y += ridmap.o
obj-y += gen-iort.o
+obj-y += iort.o
diff --git a/xen/arch/arm/acpi/iort.c b/xen/arch/arm/acpi/iort.c
new file mode 100644
index 0000000000..4238611ef7
--- /dev/null
+++ b/xen/arch/arm/acpi/iort.c
@@ -0,0 +1,401 @@
+/*
+ * Copyright (C) 2016, Semihalf
+ * Author: Tomasz Nowicki <tn@xxxxxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * This file implements early detection/parsing of I/O mapping
+ * reported to OS through firmware via I/O Remapping Table (IORT)
+ * IORT document number: ARM DEN 0049A
+ *
+ * Based on Linux 4.14.0
+ * Xen Modifications : Manish Jaggi <manish.jaggi@xxxxxxxxxx>
+ * Coding Style: Xen
+ */
+
+#define pr_fmt(fmt) "ACPI: IORT: " fmt
+
+#include <asm/acpi/ridmap.h>
+#include <asm/acpi/acpi_iort.h>
+#include <asm/fwnode.h>
+#include <asm/fwspec.h>
+#include <xen/iommu.h>
+#include <xen/kernel.h>
+#include <xen/list.h>
+#include <xen/lib.h>
+#include <xen/pci.h>
+
+#define IORT_TYPE_MASK(type) (1 << (type))
+#define IORT_MSI_TYPE (1 << ACPI_IORT_NODE_ITS_GROUP)
+#define IORT_IOMMU_TYPE ((1 << ACPI_IORT_NODE_SMMU) | \
+ (1 << ACPI_IORT_NODE_SMMU_V3))
+
+/* Until ACPICA headers cover IORT rev. C */
+#ifndef ACPI_IORT_SMMU_V3_CAVIUM_CN99XX
+#define ACPI_IORT_SMMU_V3_CAVIUM_CN99XX 0x2
+#endif
+
+/* Redefine WARN macros */
+#undef WARN
+#undef WARN_ON
+#define WARN(condition, format...) ({ \
+ int __ret_warn_on = !!(condition); \
+ if (unlikely(__ret_warn_on)) \
+ printk(format); \
+ unlikely(__ret_warn_on); \
+})
+#define WARN_TAINT(cond, taint, format...) WARN(cond, format)
+#define WARN_ON(cond) (!!cond)
+
+#define MAX_ERRNO 4095
+#define IS_ERR_VALUE(x) unlikely((unsigned long)(void *)(x) >= (unsigned
long)-MAX_ERRNO)
+
+struct iort_its_msi_chip {
+ struct list_head list;
+ struct fwnode_handle *fw_node;
+ u32 translation_id;
+};
+
+struct iort_fwnode {
+ struct list_head list;
+ struct acpi_iort_node *iort_node;
+ struct fwnode_handle *fwnode;
+};
+
+static LIST_HEAD(iort_fwnode_list);
+static DEFINE_SPINLOCK(iort_fwnode_lock);
+const struct fwnode_operations acpi_static_fwnode_ops;
+
+/**
+ * iort_set_fwnode() - Create iort_fwnode and use it to register
+ * iommu data in the iort_fwnode_list
+ *
+ * @node: IORT table node associated with the IOMMU
+ * @fwnode: fwnode associated with the IORT node
+ *
+ * Returns: 0 on success
+ * <0 on failure
+ */
+static inline int iort_set_fwnode(struct acpi_iort_node *iort_node,
+ struct fwnode_handle *fwnode)
+{
+ struct iort_fwnode *np;
+
+ np = xzalloc(struct iort_fwnode);
+
+ if ( WARN_ON(!np) )
+ return -ENOMEM;
+
+ INIT_LIST_HEAD(&np->list);
+ np->iort_node = iort_node;
+ np->fwnode = fwnode;
+ spin_lock(&iort_fwnode_lock);
+ list_add_tail(&np->list, &iort_fwnode_list);
+ spin_unlock(&iort_fwnode_lock);
+
+ return 0;
+}
+
+/**
+ * iort_get_fwnode() - Retrieve fwnode associated with an IORT node
+ *
+ * @node: IORT table node to be looked-up
+ *
+ * Returns: fwnode_handle pointer on success, NULL on failure
+ */
+static inline
+struct fwnode_handle *iort_get_fwnode(struct acpi_iort_node *node)
+{
+ struct iort_fwnode *curr;
+ struct fwnode_handle *fwnode = NULL;
+ spin_lock(&iort_fwnode_lock);
+ list_for_each_entry(curr, &iort_fwnode_list, list)
+ {
+ if ( curr->iort_node == node )
+ {
+ fwnode = curr->fwnode;
+ break;
+ }
+ }
+ spin_unlock(&iort_fwnode_lock);
+
+ return fwnode;
+}
+
+/**
+ * iort_delete_fwnode() - Delete fwnode associated with an IORT node
+ *
+ * @node: IORT table node associated with fwnode to delete
+ */
+static inline void iort_delete_fwnode(struct acpi_iort_node *node)
+{
+ struct iort_fwnode *curr, *tmp;
+
+ spin_lock(&iort_fwnode_lock);
+ list_for_each_entry_safe(curr, tmp, &iort_fwnode_list, list)
+ {
+ if ( curr->iort_node == node )
+ {
+ list_del(&curr->list);
+ xfree(curr);
+ break;
+ }
+ }
+ spin_unlock(&iort_fwnode_lock);
+}
+
+typedef acpi_status (*iort_find_node_callback)
+ (struct acpi_iort_node *node, void *context);
+
+/* Root pointer to the mapped IORT table */
+static struct acpi_table_header *iort_table;
+
+static struct acpi_iort_node *iort_scan_node(enum acpi_iort_node_type type,
+ iort_find_node_callback callback,
+ void *context)
+{
+ struct acpi_iort_node *iort_node, *iort_end;
+ struct acpi_table_iort *iort;
+ int i;
+
+ if ( !iort_table )
+ return NULL;
+
+ /* Get the first IORT node */
+ iort = (struct acpi_table_iort *)iort_table;
+ iort_node = ACPI_ADD_PTR(struct acpi_iort_node, iort,
+ iort->node_offset);
+ iort_end = ACPI_ADD_PTR(struct acpi_iort_node, iort_table,
+ iort_table->length);
+
+ for ( i = 0; i < iort->node_count; i++ )
+ {
+ if ( WARN_TAINT(iort_node >= iort_end, TAINT_FIRMWARE_WORKAROUND,
+ "IORT node pointer overflows, bad table!\n") )
+ return NULL;
+
+ if ( iort_node->type == type &&
+ ACPI_SUCCESS(callback(iort_node, context)) )
+ return iort_node;
+
+ iort_node = ACPI_ADD_PTR(struct acpi_iort_node, iort_node,
+ iort_node->length);
+ }
+
+ return NULL;
+}
+
+static acpi_status iort_match_node_callback(struct acpi_iort_node *node,
+ void *context)
+{
+ struct device *dev = context;
+ acpi_status status = AE_NOT_FOUND;
+
+ if ( node->type == ACPI_IORT_NODE_PCI_ROOT_COMPLEX )
+ {
+ struct acpi_iort_root_complex *pci_rc;
+ struct pci_dev *pdev;
+
+ pdev = to_pci_dev(dev);
+ pci_rc = (struct acpi_iort_root_complex *)node->node_data;
+
+ /*
+ * It is assumed that PCI segment numbers maps one-to-one
+ * with root complexes. Each segment number can represent only
+ * one root complex.
+ */
+ status = pci_rc->pci_segment_number == pci_domain_nr(pdev) ?
+ AE_OK : AE_NOT_FOUND;
+ }
+
+ return status;
+}
+
+static int arm_smmu_iort_xlate(struct device *dev, u32 streamid,
+ struct fwnode_handle *fwnode,
+ const struct iommu_ops *ops)
+{
+ int ret;
+ ret = iommu_fwspec_init(dev, fwnode, ops);
+
+ if ( !ret )
+ ret = iommu_fwspec_add_ids(dev, &streamid, 1);
+
+ return ret;
+}
+
+static inline
+const struct iommu_ops *iort_fwspec_iommu_ops(struct iommu_fwspec *fwspec)
+{
+ return (fwspec && fwspec->ops) ? fwspec->ops : NULL;
+}
+
+static int iort_iommu_xlate(struct device *dev, struct acpi_iort_node *node,
+ u32 streamid)
+{
+ const struct iommu_ops *ops;
+ struct fwnode_handle *iort_fwnode;
+
+ if ( !node )
+ return -ENODEV;
+
+ iort_fwnode = iort_get_fwnode(node);
+ if ( !iort_fwnode )
+ return -ENODEV;
+
+ /*
+ * If the ops look-up fails, this means that either
+ * the SMMU drivers have not been probed yet or that
+ * the SMMU drivers are not built in the kernel;
+ * Depending on whether the SMMU drivers are built-in
+ * in the kernel or not, defer the IOMMU configuration
+ * or just abort it.
+ */
+ ops = iommu_ops_from_fwnode(iort_fwnode);
+ if (!ops)
+ return -1;
+
+ return arm_smmu_iort_xlate(dev, streamid, iort_fwnode, ops);
+}
+
+struct iort_pci_alias_info {
+ struct device *dev;
+ struct acpi_iort_node *node;
+};
+
+static int iort_pci_iommu_init(struct pci_dev *pdev, u16 alias, void *data)
+{
+ struct iort_pci_alias_info *info = data;
+ struct acpi_iort_node *smmu_node;
+ u32 streamid;
+
+ if ( query_sid(info->node, alias, &streamid, &smmu_node) )
+ return iort_iommu_xlate(info->dev, smmu_node, streamid);
+
+ return -1;
+}
+
+int pci_for_each_dma_alias(struct pci_dev *pdev,
+ int (*fn)(struct pci_dev *pdev,
+ u16 alias, void *data), void *data)
+{
+ return fn(pdev, PCI_BDF2(pdev->bus, pdev->devfn), data);
+}
+
+/**
+ * iort_iommu_configure - Set-up IOMMU configuration for a device.
+ *
+ * @dev: device to configure
+ *
+ * Returns: iommu_ops pointer on configuration success
+ * NULL on configuration failure
+ */
+const struct iommu_ops *iort_iommu_configure(struct device *dev)
+{
+ struct acpi_iort_node *node;
+ const struct iommu_ops *ops;
+ int err = -ENODEV;
+
+ /*
+ * If we already translated the fwspec there
+ * is nothing left to do, return the iommu_ops.
+ */
+ ops = iort_fwspec_iommu_ops(dev->iommu_fwspec);
+ if ( ops )
+ return ops;
+
+ if ( dev_is_pci(dev) )
+ {
+ struct iort_pci_alias_info info = { .dev = dev };
+ node = iort_scan_node(
+ ACPI_IORT_NODE_PCI_ROOT_COMPLEX,
+ iort_match_node_callback,
+ dev);
+ if ( !node )
+ return NULL;
+
+ info.node = node;
+ err = pci_for_each_dma_alias(
+ to_pci_dev(dev),
+ iort_pci_iommu_init, &info);
+ }
+
+ return ops;
+}
+
+int iort_add_smmu_platform_device(struct acpi_iort_node *node)
+{
+ struct device *dev;
+ struct fwnode_handle *fwnode;
+ int ret;
+
+ dev = xzalloc(struct device);
+ if ( !dev )
+ return -ENOMEM;
+
+ dev->type = DEV_ACPI;
+ dev->acpi_node = node;
+
+ fwnode = iort_get_fwnode(node);
+
+ if ( !fwnode )
+ {
+ ret = -ENODEV;
+ goto end;
+ }
+
+ dev->fwnode = fwnode;
+ dev->iommu_fwspec = xzalloc(struct iommu_fwspec);
+
+ if ( !dev->iommu_fwspec )
+ {
+ ret = -ENOMEM;
+ goto end;
+ }
+
+ /* Call the acpi init functions for IOMMU devices */
+ ret = acpi_device_init(DEVICE_IOMMU, (void *) dev, node->type);
+end:
+ return ret;
+}
+
+static inline struct fwnode_handle *acpi_alloc_fwnode_static(void)
+{
+ struct fwnode_handle *fwnode;
+
+ fwnode = xzalloc(struct fwnode_handle);
+ if ( !fwnode )
+ return NULL;
+
+ fwnode->ops = &acpi_static_fwnode_ops;
+
+ return fwnode;
+}
+
+int __init acpi_iort_init(void)
+{
+ acpi_status status;
+
+ status = acpi_get_table(ACPI_SIG_IORT, 0, &iort_table);
+
+ if ( ACPI_FAILURE(status) )
+ {
+ if ( status != AE_NOT_FOUND )
+ {
+ const char *msg = acpi_format_exception(status);
+ printk("Failed to get table, %s\n", msg);
+ }
+
+ return -1;
+ }
+
+ return 0;
+}
+__initcall(acpi_iort_init);
diff --git a/xen/include/asm-arm/device.h b/xen/include/asm-arm/device.h
index b75d79b793..19a76f59d6 100644
--- a/xen/include/asm-arm/device.h
+++ b/xen/include/asm-arm/device.h
@@ -7,6 +7,7 @@ enum device_type
{
DEV_DT,
DEV_PCI,
+ DEV_ACPI,
};
struct dev_archdata {
@@ -18,9 +19,18 @@ struct device
{
enum device_type type;
#ifdef CONFIG_HAS_DEVICE_TREE
- struct dt_device_node *of_node; /* Used by drivers imported from Linux */
+ /*
+ * TODO: of_node is redundant by addition of fwnode.
+ * Will be cleaned in future, kept here for compatability
+ * with smmuv2 driver
+ */
+ struct dt_device_node *of_node;
+#endif
+#ifdef CONFIG_ACPI
+ void *acpi_node;
#endif
struct dev_archdata archdata;
+ struct fwnode_handle *fwnode;
struct iommu_fwspec *iommu_fwspec;
};
--
2.14.1
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