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iommu: add ARM LPAE page table allocator

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A number of IOMMUs found in ARM SoCs can walk architecture-compatible
page tables.

This patch adds a generic allocator for Stage-1 and Stage-2 v7/v8
long-descriptor page tables. 4k, 16k and 64k pages are supported, with
up to 4-levels of walk to cover a 48-bit address space.

Tested-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Will Deacon
2014-11-14 17:18:23 +00:00
parent fdb1d7be7c
commit e1d3c0fd70
6 changed files with 817 additions and 0 deletions
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1
MAINTAINERS
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@@ -1589,6 +1589,7 @@ M: Will Deacon <will.deacon@arm.com>
L: linux-arm-kernel@lists.infradead.org (moderated for non-subscribers)
S: Maintained
F: drivers/iommu/arm-smmu.c
F: drivers/iommu/io-pgtable-arm.c
ARM64 PORT (AARCH64 ARCHITECTURE)
M: Catalin Marinas <catalin.marinas@arm.com>

9
drivers/iommu/Kconfig
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@@ -19,6 +19,15 @@ menu "Generic IOMMU Pagetable Support"
config IOMMU_IO_PGTABLE
bool
config IOMMU_IO_PGTABLE_LPAE
bool "ARMv7/v8 Long Descriptor Format"
select IOMMU_IO_PGTABLE
help
Enable support for the ARM long descriptor pagetable format.
This allocator supports 4K/2M/1G, 16K/32M and 64K/512M page
sizes at both stage-1 and stage-2, as well as address spaces
up to 48-bits in size.
endmenu
config OF_IOMMU

1
drivers/iommu/Makefile
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@@ -2,6 +2,7 @@ obj-$(CONFIG_IOMMU_API) += iommu.o
obj-$(CONFIG_IOMMU_API) += iommu-traces.o
obj-$(CONFIG_IOMMU_API) += iommu-sysfs.o
obj-$(CONFIG_IOMMU_IO_PGTABLE) += io-pgtable.o
obj-$(CONFIG_IOMMU_IO_PGTABLE_LPAE) += io-pgtable-arm.o
obj-$(CONFIG_OF_IOMMU) += of_iommu.o
obj-$(CONFIG_MSM_IOMMU) += msm_iommu.o msm_iommu_dev.o
obj-$(CONFIG_AMD_IOMMU) += amd_iommu.o amd_iommu_init.o

781
drivers/iommu/io-pgtable-arm.c Normal file
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File diff suppressed because it is too large Load Diff

11
drivers/iommu/io-pgtable.c
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@@ -24,9 +24,20 @@
#include "io-pgtable.h"
extern struct io_pgtable_init_fns io_pgtable_arm_32_lpae_s1_init_fns;
extern struct io_pgtable_init_fns io_pgtable_arm_32_lpae_s2_init_fns;
extern struct io_pgtable_init_fns io_pgtable_arm_64_lpae_s1_init_fns;
extern struct io_pgtable_init_fns io_pgtable_arm_64_lpae_s2_init_fns;
static const struct io_pgtable_init_fns *
io_pgtable_init_table[IO_PGTABLE_NUM_FMTS] =
{
#ifdef CONFIG_IOMMU_IO_PGTABLE_LPAE
[ARM_32_LPAE_S1] = &io_pgtable_arm_32_lpae_s1_init_fns,
[ARM_32_LPAE_S2] = &io_pgtable_arm_32_lpae_s2_init_fns,
[ARM_64_LPAE_S1] = &io_pgtable_arm_64_lpae_s1_init_fns,
[ARM_64_LPAE_S2] = &io_pgtable_arm_64_lpae_s2_init_fns,
#endif
};
struct io_pgtable_ops *alloc_io_pgtable_ops(enum io_pgtable_fmt fmt,

14
drivers/iommu/io-pgtable.h
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@@ -5,6 +5,10 @@
* Public API for use by IOMMU drivers
*/
enum io_pgtable_fmt {
ARM_32_LPAE_S1,
ARM_32_LPAE_S2,
ARM_64_LPAE_S1,
ARM_64_LPAE_S2,
IO_PGTABLE_NUM_FMTS,
};
@@ -47,6 +51,16 @@ struct io_pgtable_cfg {
/* Low-level data specific to the table format */
union {
struct {
u64 ttbr[2];
u64 tcr;
u64 mair[2];
} arm_lpae_s1_cfg;
struct {
u64 vttbr;
u64 vtcr;
} arm_lpae_s2_cfg;
};
};