> -Original Message-
> From: Alex Williamson [mailto:alex.william...@redhat.com]
> Sent: Friday, October 04, 2013 11:42 PM
> To: Bhushan Bharat-R65777
> Cc: j...@8bytes.org; b...@kernel.crashing.org; ga...@kernel.crashing.org;
> linux-
> ker...@vger.kernel.org; linuxppc-...@lists.ozlabs.
Patch written by Antonios Motakis :
IOMMU groups are expected by certain users of the IOMMU API,
e.g. VFIO. Since each device is behind its own System MMU, we
can allocate a new IOMMU group for each device.
Reviewd-by: Cho KyongHo
Signed-off-by: Antonios Motakis
---
drivers/iommu/exynos-iommu.
iommu_attach_device() against exynos-iommu positive integer on success
if the caller calls iommu_attach_device() with the same iommu_domain
multiple times without call to iommu_detach_device() to inform the
caller how many calls to iommu_detach_device() to really detach iommu.
However the conventi
Since acquiring read_lock is not more frequent than write_lock, it is
not beneficial to use rwlock, this commit changes rwlock to spinlock.
Reviewed-by: Grant Grundler
Signed-off-by: Cho KyongHo
---
drivers/iommu/exynos-iommu.c | 35 ++-
1 files changed, 18 ins
This adds support for Suspend to RAM and Runtime Power Management.
Since System MMU is located in the same local power domain of its
master H/W, System MMU must be initialized before it is working if
its power domain was ever turned off. TLB invalidation according to
unmapping on page tables must
This commit removes custom fault handler. The device drivers that
need to register fault handler can register
with iommu_set_fault_handler().
CC: Grant Grundler
Signed-off-by: Cho KyongHo
---
drivers/iommu/exynos-iommu.c | 80 -
1 files changed, 24 inse
Runtime power management by exynos-iommu driver independently from
master H/W's runtime pm is not useful for power saving since attaching
master H/W in probing time turns on its local power endlessly.
Thus this removes runtime pm API calls.
Runtime PM support is added in the following commits to ex
This patch gates clocks of master H/W as well as clocks of System MMU
if master clocks are specified.
Some Exynos SoCs (i.e. GScalers in Exynos5250) have dependencies in
the gating clocks of master H/W and its System MMU. If a H/W is the
case, accessing control registers of System MMU is prohibite
This patch adds dts entries for the System MMU devices found on
Exynos4 and Exynos5 SoC series and the System MMU binding
documentation.
CC: Sylwester Nawrocki
Signed-off-by: Cho KyongHo
---
.../bindings/iommu/samsung,exynos4210-sysmmu.txt | 76 +
arch/arm/boot/dts/exynos4.dtsi
This turns on ACGEN and SYSSEL.
ACGEN is architectural clock gating that gates clocks by System MMU
itself if it is not active. Note that ACGEN is different from clock
gating by the CPU. ACGEN just gates clocks to the internal logic of
System MMU while clock gating by the CPU gates clocks to the S
This commit adds device tree support for System MMU.
This also include the following changes and enhancements:
* use managed device helper functions.
Simplyfies System MMU device driver.
Signed-off-by: Cho KyongHo
---
drivers/iommu/Kconfig|5 ++---
drivers/iommu/exynos-iommu.c | 2
This adds gate clocks of all System MMUs and their master IPs
that are not apeared in clk-exynos5250.c and clk-exynos5420.c
Also fixes GATE_IP_ACP to 0x18800 and changed GATE_DA to GATE
for System MMU clocks in clk-exynos4.c
Signed-off-by: Cho KyongHo
---
.../devicetree/bindings/clock/exynos5250
This patch uses managed device helper functions in the probe().
Signed-off-by: Cho KyongHo
---
drivers/iommu/exynos-iommu.c | 64 -
1 files changed, 25 insertions(+), 39 deletions(-)
diff --git a/drivers/iommu/exynos-iommu.c b/drivers/iommu/exynos-iommu
This patch removes dbgname member from sysmmu_drvdata structure.
Kernel message for debugging already has the name of a single
System MMU node.
Signed-off-by: Cho KyongHo
---
drivers/iommu/exynos-iommu.c | 34 +-
1 files changed, 13 insertions(+), 21 deletions(-
Checking if the probing device has a parent device was just to discover
if the probing device is involved in a power domain when the power
domain controlled by Samsung's custom implementation.
Since generic IO power domain is applied, it is required to remove
the condition to see if the probing dev
System MMU driver is changed to control only a single instance of
System MMU at a time. Since a single instance of System MMU has only
a single clock descriptor for its clock gating, there is no need to
obtain two or more clock descriptors.
Signed-off-by: Cho KyongHo
---
drivers/iommu/exynos-iom
Since kmalloc() does not guarantee that the allignment of 1KiB when it
allocates 1KiB, it is required to allocate lv2 page table from own
slab that guarantees alignment of 1KiB
Signed-off-by: Cho KyongHo
---
drivers/iommu/exynos-iommu.c | 34 --
1 files changed,
L2TLB is 8-way set-associative TLB with 512 entries. The number of
sets is 64.
A single 4KB(small page) translation information is cached
only to a set whose index is the same with the lower 6 bits of the page
frame number.
A single 64KB(large page) translation information can be
cached to any 16 s
This patch changes not to panic on any error when updating page table.
Instead prints error messages with callstack.
Signed-off-by: Cho KyongHo
---
drivers/iommu/exynos-iommu.c | 58 +++--
1 files changed, 44 insertions(+), 14 deletions(-)
diff --git a/driv
Commit 25e9d28d92 (ARM: EXYNOS: remove system mmu initialization from
exynos tree) removed arch/arm/mach-exynos/mach/sysmmu.h header without
removing remaining use of it from exynos-iommu driver, thus causing a
compilation error.
This patch fixes the error by removing respective include line
from
The current exynos-iommu(System MMU) driver does not work autonomously
since it is lack of support for power management of peripheral blocks.
For example, MFC device driver must ensure that its System MMU is disabled
before MFC block is power-down not to invalidate IOTLB in the System MMU
when I/O
This commit adds cache flush for removed small and large page entries
in exynos_iommu_unmap(). Missing cache flush of removed page table
entries can cause missing page fault interrupt when a master IP
accesses an unmapped area.
Reviewed-by: Tomasz Figa
Tested-by: Grant Grundler
Signed-off-by: Ch
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