@@ -9,6 +9,7 @@
HAS_DEVICE_TREE := y
HAS_VIDEO := y
HAS_ARM_HDLCD := y
+HAS_PASSTHROUGH := y
CFLAGS += -I$(BASEDIR)/include
@@ -546,6 +546,9 @@ int arch_domain_create(struct domain *d, unsigned int domcr_flags)
if ( (d->domain_id == 0) && (rc = domain_vuart_init(d)) )
goto fail;
+ if ( (rc = iommu_domain_init(d)) != 0 )
+ goto fail;
+
return 0;
fail:
@@ -557,6 +560,10 @@ fail:
void arch_domain_destroy(struct domain *d)
{
+ /* IOMMU page table is shared with P2M, always call
+ * iommu_domain_destroy() before p2m_teardown().
+ */
+ iommu_domain_destroy(d);
p2m_teardown(d);
domain_vgic_free(d);
domain_vuart_free(d);
@@ -669,7 +669,7 @@ static int make_timer_node(const struct domain *d, void *fdt,
}
/* Map the device in the domain */
-static int map_device(struct domain *d, const struct dt_device_node *dev)
+static int map_device(struct domain *d, struct dt_device_node *dev)
{
unsigned int nirq;
unsigned int naddr;
@@ -684,6 +684,18 @@ static int map_device(struct domain *d, const struct dt_device_node *dev)
DPRINT("%s nirq = %d naddr = %u\n", dt_node_full_name(dev), nirq, naddr);
+ if ( dt_device_is_protected(dev) )
+ {
+ DPRINT("%s setup iommu\n", dt_node_full_name(dev));
+ res = iommu_assign_dt_device(d, dev);
+ if ( res )
+ {
+ printk(XENLOG_ERR "Failed to setup the IOMMU for %s\n",
+ dt_node_full_name(dev));
+ return res;
+ }
+ }
+
/* Map IRQs */
for ( i = 0; i < nirq; i++ )
{
@@ -755,7 +767,7 @@ static int map_device(struct domain *d, const struct dt_device_node *dev)
}
static int handle_node(struct domain *d, struct kernel_info *kinfo,
- const struct dt_device_node *node)
+ struct dt_device_node *node)
{
static const struct dt_device_match skip_matches[] __initconst =
{
@@ -776,7 +788,7 @@ static int handle_node(struct domain *d, struct kernel_info *kinfo,
DT_MATCH_TIMER,
{ /* sentinel */ },
};
- const struct dt_device_node *child;
+ struct dt_device_node *child;
int res;
const char *name;
const char *path;
@@ -1009,6 +1021,7 @@ int construct_dom0(struct domain *d)
kinfo.unassigned_mem = dom0_mem;
allocate_memory(d, &kinfo);
+ iommu_dom0_init(d);
rc = kernel_prepare(&kinfo);
if ( rc < 0 )
@@ -412,12 +412,16 @@ static int apply_p2m_changes(struct domain *d,
if ( flush )
{
+ unsigned long sgfn = paddr_to_pfn(start_gpaddr);
+ unsigned long egfn = paddr_to_pfn(end_gpaddr);
+
/* At the beginning of the function, Xen is updating VTTBR
* with the domain where the mappings are created. In this
* case it's only necessary to flush TLBs on every CPUs with
* the current VMID (our domain).
*/
flush_tlb();
+ iommu_iotlb_flush(d, sgfn, egfn - sgfn);
}
if ( op == ALLOCATE || op == INSERT )
@@ -728,6 +728,8 @@ void __init start_xen(unsigned long boot_phys_offset,
local_irq_enable();
local_abort_enable();
+ iommu_setup();
+
smp_prepare_cpus(cpus);
initialize_keytable();
@@ -1,6 +1,7 @@
subdir-$(x86) += vtd
subdir-$(x86) += amd
subdir-$(x86_64) += x86
+subdir-$(arm) += arm
obj-y += iommu.o
obj-$(x86) += io.o
new file mode 100644
@@ -0,0 +1 @@
+obj-y += iommu.o
new file mode 100644
@@ -0,0 +1,65 @@
+/*
+ * xen/drivers/passthrough/arm/iommu.c
+ *
+ * Generic IOMMU framework via the device tree
+ *
+ * Julien Grall <julien.grall@linaro.org>
+ * Copyright (c) 2014 Linaro Limited.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that 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.
+ */
+
+#include <xen/lib.h>
+#include <xen/iommu.h>
+#include <xen/device_tree.h>
+#include <asm/device.h>
+
+static const struct iommu_ops *iommu_ops;
+
+const struct iommu_ops *iommu_get_ops(void)
+{
+ return iommu_ops;
+}
+
+void __init iommu_set_ops(const struct iommu_ops *ops)
+{
+ BUG_ON(ops == NULL);
+
+ if ( iommu_ops && iommu_ops != ops )
+ printk("WARNING: IOMMU ops already set to a different value\n");
+
+ iommu_ops = ops;
+}
+
+int __init iommu_hardware_setup(void)
+{
+ struct dt_device_node *np;
+ int rc;
+ unsigned int num_iommus = 0;
+
+ dt_for_each_device_node(dt_host, np)
+ {
+ rc = device_init(np, DEVICE_IOMMU, NULL);
+ if ( !rc )
+ num_iommus++;
+ }
+
+ return ( num_iommus > 0 ) ? 0 : -ENODEV;
+}
+
+int arch_iommu_domain_init(struct domain *d)
+{
+ return 0;
+}
+
+void arch_iommu_domain_destroy(struct domain *d)
+{
+}
@@ -6,7 +6,8 @@
enum device_type
{
- DEVICE_SERIAL
+ DEVICE_SERIAL,
+ DEVICE_IOMMU,
};
struct device_desc {
@@ -9,6 +9,7 @@
#include <asm/vfp.h>
#include <public/hvm/params.h>
#include <xen/serial.h>
+#include <xen/hvm/iommu.h>
/* Represents state corresponding to a block of 32 interrupts */
struct vgic_irq_rank {
@@ -72,6 +73,7 @@ struct pending_irq
struct hvm_domain
{
uint64_t params[HVM_NR_PARAMS];
+ struct hvm_iommu hvm_iommu;
} __cacheline_aligned;
#ifdef CONFIG_ARM_64
new file mode 100644
@@ -0,0 +1,10 @@
+#ifndef __ASM_ARM_HVM_IOMMU_H_
+#define __ASM_ARM_HVM_IOMMU_H_
+
+struct arch_hvm_iommu
+{
+ /* Private information for the IOMMU drivers */
+ void *priv;
+};
+
+#endif /* __ASM_ARM_HVM_IOMMU_H_ */
new file mode 100644
@@ -0,0 +1,36 @@
+/*
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
+ * Place - Suite 330, Boston, MA 02111-1307 USA.
+*/
+#ifndef __ARCH_ARM_IOMMU_H__
+#define __ARCH_ARM_IOMMU_H__
+
+/* Always share P2M Table between the CPU and the IOMMU */
+#define iommu_use_hap_pt(d) (1)
+#define domain_hvm_iommu(d) (&d->arch.hvm_domain.hvm_iommu)
+
+const struct iommu_ops *iommu_get_ops(void);
+void __init iommu_set_ops(const struct iommu_ops *ops);
+
+int __init iommu_hardware_setup(void);
+
+#endif /* __ARCH_ARM_IOMMU_H__ */
+
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 4
+ * indent-tabs-mode: nil
+ * End:
+ */
This patch contains the architecture to use IOMMUs on ARM. There is no IOMMU drivers on this patch. In this implementation, IOMMU page table will be shared with the P2M. The code will run through the device tree and will initialize every IOMMU. It's possible to have multiple IOMMUs on the same platform, but they must be handled with the same driver. For now, there is no support for using multiple iommu drivers at runtime. Each new IOMMU drivers should contain: static const char * const myiommu_dt_compat[] __initconst = { /* list of device compatible with the drivers. Will be matched with * the "compatible" property on the device tree */ NULL, }; DT_DEVICE_START(myiommu, "MY IOMMU", DEVICE_IOMMU) .compatible = myiommu_compatible, .init = myiommu_init, DT_DEVICE_END Signed-off-by: Julien Grall <julien.grall@linaro.org> Cc: Xiantao Zhang <xiantao.zhang@intel.com> Cc: Jan Beulich <jbeulich@suse.com> --- Changes in v2: - Fix typoes in commit message - Remove useless comment in arch/arm/setup.c - Update copyright date to 2014 - Move iommu_dom0_init earlier - Call iommu_assign_dt_device in map_device when the device is protected by an IOMMU --- xen/arch/arm/Rules.mk | 1 + xen/arch/arm/domain.c | 7 ++++ xen/arch/arm/domain_build.c | 19 ++++++++-- xen/arch/arm/p2m.c | 4 +++ xen/arch/arm/setup.c | 2 ++ xen/drivers/passthrough/Makefile | 1 + xen/drivers/passthrough/arm/Makefile | 1 + xen/drivers/passthrough/arm/iommu.c | 65 ++++++++++++++++++++++++++++++++++ xen/include/asm-arm/device.h | 3 +- xen/include/asm-arm/domain.h | 2 ++ xen/include/asm-arm/hvm/iommu.h | 10 ++++++ xen/include/asm-arm/iommu.h | 36 +++++++++++++++++++ 12 files changed, 147 insertions(+), 4 deletions(-) create mode 100644 xen/drivers/passthrough/arm/Makefile create mode 100644 xen/drivers/passthrough/arm/iommu.c create mode 100644 xen/include/asm-arm/hvm/iommu.h create mode 100644 xen/include/asm-arm/iommu.h