On 15/03/16 17:05, Magnus Damm wrote:
From: Magnus Damm <damm+rene...@opensource.se>
Introduce a new set of iommu_ops suitable for 64-bit ARM
as well as 32-bit ARM when CONFIG_IOMMU_DMA=y. The ->of_xlate()
callback is needed by the code exported by of_iommu.h and
it is wrapped in #ifdefs to also compile of x86_64.
Signed-off-by: Magnus Damm <damm+rene...@opensource.se>
---
drivers/iommu/ipmmu-vmsa.c | 94 +++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 92 insertions(+), 2 deletions(-)
--- 0011/drivers/iommu/ipmmu-vmsa.c
+++ work/drivers/iommu/ipmmu-vmsa.c 2016-03-16 01:35:06.990513000 +0900
@@ -10,6 +10,7 @@
#include <linux/bitmap.h>
#include <linux/delay.h>
+#include <linux/dma-iommu.h>
#include <linux/dma-mapping.h>
#include <linux/err.h>
#include <linux/export.h>
@@ -804,7 +805,7 @@ static void ipmmu_remove_device(struct d
dev->archdata.iommu = NULL;
}
-static const struct iommu_ops ipmmu_ops = {
+static const struct iommu_ops __maybe_unused ipmmu_ops = {
.domain_alloc = ipmmu_domain_alloc,
.domain_free = ipmmu_domain_free,
.attach_dev = ipmmu_attach_device,
@@ -818,6 +819,92 @@ static const struct iommu_ops ipmmu_ops
.pgsize_bitmap = SZ_1G | SZ_2M | SZ_4K,
};
+static struct iommu_domain *ipmmu_domain_alloc_dma(unsigned type)
+{
+ struct iommu_domain *io_domain;
+
+ if (type != IOMMU_DOMAIN_DMA)
+ return NULL;
+
+ io_domain = __ipmmu_domain_alloc(type);
+ if (io_domain)
+ iommu_get_dma_cookie(io_domain);
+
+ return io_domain;
+}
+
+static void ipmmu_domain_free_dma(struct iommu_domain *io_domain)
+{
+ iommu_put_dma_cookie(io_domain);
+ ipmmu_domain_free(io_domain);
+}
+
+static int ipmmu_add_device_dma(struct device *dev)
+{
+ struct iommu_group *group;
+
+ /* only accept devices with iommus property */
+ if (of_count_phandle_with_args(dev->of_node, "iommus",
+ "#iommu-cells") < 0)
+ return -ENODEV;
It seems a bit weird to deliberately ignore the information of_xlate
gives you, only to go off poking the DT to dredge it up manually later.
Why not use of_xlate to create the archdata, then simply check for it
here? (Ideally that should also be common with ARM, but I think you
still get called in the wrong order there)
+
+ group = iommu_group_get_for_dev(dev);
+ if (IS_ERR(group))
+ return PTR_ERR(group);
+
+ return 0;
+}
+
+static void ipmmu_remove_device_dma(struct device *dev)
+{
+ iommu_group_remove_device(dev);
+}
+
+static struct iommu_group *ipmmu_device_group_dma(struct device *dev)
+{
+ struct iommu_group *group;
+ int ret;
+
+ group = generic_device_group(dev);
+ if (IS_ERR(group))
+ return group;
+
+ ret = ipmmu_init_platform_device(dev, group);
+ if (ret) {
+ iommu_group_put(group);
+ group = ERR_PTR(ret);
+ }
+
+ return group;
+}
+
+#ifdef CONFIG_OF_IOMMU
+static int ipmmu_of_xlate_dma(struct device *dev,
+ struct of_phandle_args *spec)
+{
+ /* dummy callback to satisfy of_iommu_configure() */
+ return 0;
+}
+#endif
+
+static const struct iommu_ops __maybe_unused ipmmu_ops_dma = {
+ .domain_alloc = ipmmu_domain_alloc_dma,
+ .domain_free = ipmmu_domain_free_dma,
+ .attach_dev = ipmmu_attach_device,
+ .detach_dev = ipmmu_detach_device,
+ .map = ipmmu_map,
+ .unmap = ipmmu_unmap,
+ .map_sg = default_iommu_map_sg,
+ .iova_to_phys = ipmmu_iova_to_phys,
+ .add_device = ipmmu_add_device_dma,
+ .remove_device = ipmmu_remove_device_dma,
+ .device_group = ipmmu_device_group_dma,
+ .pgsize_bitmap = SZ_1G | SZ_2M | SZ_4K,
+#ifdef CONFIG_OF_IOMMU
+ .of_xlate = ipmmu_of_xlate_dma,
+#endif
Yup, I definitely think Arnd is right about eradicating these #ifdefs[1].
Robin.
[1]:http://thread.gmane.org/gmane.linux.kernel/2177390
+};
+
/*
-----------------------------------------------------------------------------
* Probe/remove and init
*/
@@ -929,14 +1016,17 @@ static struct platform_driver ipmmu_driv
static int __init ipmmu_init(void)
{
+ const struct iommu_ops *ops;
int ret;
ret = platform_driver_register(&ipmmu_driver);
if (ret < 0)
return ret;
+ ops = IS_ENABLED(CONFIG_IOMMU_DMA) ? &ipmmu_ops_dma : &ipmmu_ops;
+
if (!iommu_present(&platform_bus_type))
- bus_set_iommu(&platform_bus_type, &ipmmu_ops);
+ bus_set_iommu(&platform_bus_type, ops);
return 0;
}
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