Date:	Thu, 08 Aug 2013 14:13:57 +0200
From:	Tomasz Figa <t.figa@...sung.com>
To:	Cho KyongHo <pullip.cho@...sung.com>
Cc:	'Linux ARM Kernel' <linux-arm-kernel@...ts.infradead.org>,
	'Linux IOMMU' <iommu@...ts.linux-foundation.org>,
	'Linux Kernel' <linux-kernel@...r.kernel.org>,
	'Linux Samsung SOC' <linux-samsung-soc@...r.kernel.org>,
	devicetree@...r.kernel.org, 'Joerg Roedel' <joro@...tes.org>,
	'Kukjin Kim' <kgene.kim@...sung.com>,
	'Prathyush' <prathyush.k@...sung.com>,
	'Rahul Sharma' <rahul.sharma@...sung.com>,
	'Subash Patel' <supash.ramaswamy@...aro.org>,
	'Grant Grundler' <grundler@...omium.org>,
	'Antonios Motakis' <a.motakis@...tualopensystems.com>,
	kvmarm@...ts.cs.columbia.edu,
	'Sachin Kamat' <sachin.kamat@...aro.org>
Subject: Re: [PATCH v9 00/16] iommu/exynos: Fixes and Enhancements of System
 MMU driver with DT

Hi KyongHo,

Just a little hint for future:

To make reviewing your patches easier, please send all patches (01 and 
further) as a follow up (reply) to cover letter of the series (patch 00).

This can be achieved by using --thread switch of git send-email for 
example.

Best regards,
Tomasz

On Thursday 08 of August 2013 18:37:10 Cho KyongHo wrote:
> 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 memory mapping is changed. Because a System MMU
> resides in the same H/W block, access to control registers of System MMU
> while the H/W block is turned off must be prohibited.
> 
> This set of changes solves the above problem with setting each System
> MMUs as the parent of the device which owns the System MMU to receive
> the information when the device is turned off or turned on.
> 
> Another big change to the driver is the support for devicetree.
> The bindings for System MMU is described in
> Documentation/devicetree/bindings/arm/samsung/system-mmu.txt
> 
> In addition, this patchset also includes several bug fixes and
> enhancements of the current driver.
> 
> Change log:
> v9:
> - Rebased on the following branches
>   git.linaro.org/git-ro/people/mturquette/linux.git/clk-next
>  
> git.kernel.org/pub/scm/linux/kernel/git/kgene/linux-samsung.git/samsung-
> next git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/master
> (3.11-rc4) - Split "add bus notifier for registering System MMU" into 5
> patches - Call clk_prepare() that was missing in v8.
> - Fixed base address of sysmmu_tv in exynos4210.dtsi
> - BUG_ON() instead of return -EADDRINUSE when trying mapping on an mapped
> area - Moved camif_top to 317 in drivers/clk/samsung/clk-exynos5250.c -
> Removed 'iommu' property from 'codec'(mfc) node
> - Does not make 'master' clock to be the parent of 'sysmmu' clock.
>    'master' clock is enabled before accessing control registers of System
> MMU and disabled after the access.
> 
> v8:
> - Reordered patch list: moved "change rwloc to spinlock" to the last.
> - Fixed remained bug in "fix page table maintenance".
> - Always return 0 from exynos_iommu_attach_device().
> - Removed prefetch buffer setting when System MMU is enabled
>   due to the restriction of prefetch buffers:
>   A prefetch buffer must not hit from more than one DMA.
>   For instance with GScalers, if a single prefetch buffer is initialized
>   with 0x0 ~ 0xFFFFFFFF and a GScaler works on source buffer at
> 0x10000000 and target buffer @ 0x20000000, the System MMU may be got
> deadlock. Clients must initialize prefetch buffers with custom function
> defined in exynos-iommu drivers whenever they need to enable prefetch
> buffers. - The clock of System MMU has no relationship with the clock of
> its master H/W. The clock of master H/W is always enabled when
> exynos-iommu driver needs to access MMIO area and disabled as soon as
> the access finishes. - Removed err_page variable used in
> exynos_iommu_unmap() in the previous patch "fix page table maintenance".
> - Split a big patch "add bus notifier for registering System MMU".
>    Extracted the following 2 patches: 9/12 and 10/12.
> - And some additional fixes...
> 
> v7:
> - Rebased on the stable 3.10
> - Registered PM domains and gate clocks with DT
> - Changed connection method between a System MMU and its master H/W
>    'mmu-master' property in the node of System MMU
>    --> 'iommu' property in the node of master H/W
> - Marking device descriptor of master H/W of a System MMU with bus
> notifier. - Power management (PM_RUNTIME, PM_SLEEP) of System MMUs with
> gpd_dev_ops of Generic IO Powerdomain. gpd_dev_ops are set to the master
> H/Ws before they are probed in the bus notifier.
> - Removed additional debugging features like debugfs entries and
>    version names.
> - Removed support for advanced features of System MMU 3.2 and 3.3
>    the current IOMMU API cannot handle the feature
>   (A kind of L2 TLB that fetches several consequence page table entries.
>    It must be initialized by the driver of master H/W whenever it works.)
> 
> v6:
> - Rebased on the branch, next/iommu-exynos of
>   git.kernel.org/pub/scm/linux/kernel/git/kgene/linux-samsung.git
> 
> v5:
> - new bugfix: patch 01
> - Reordered patches
>   * patch 01 ~ 05: Bugfix and enhancements of the existing driver
>   * patch 06 ~ 10: Device Tree support and callbacks for power management
> * patch 11     : System MMU 3.2 and 3.3 support
>   * patch 12 ~ 14: Debugging features
> - Additional code compaction
> 
> v4:
> - Remove Change-Id from v3 patches
> - Change the order of the third and the first patch
>   Thanks to Kukjin Kim.
> - Fix memory leak when allocating and assigning exynos_iommu_owner to
> client device if the client device has multiple System MMUs.
>   Thanks to Rahul Sharma.
> 
> v3:
> - Fix prefetch buffer flag definition for System MMU 3.3 (patch 10/12)
> - Fix incorrect setting for SET_RUNTIME_PM_OPS (patch 09/12)
>   Thanks to Prathyush.
> 
> v2:
> - Split the patch to iommu/exynos into 9 patches
> - Support for System MMU 3.3
> - Some code compaction
> 
> Patch summary:
> 
> Diffstats:
>  .../devicetree/bindings/clock/exynos5250-clock.txt |   26 +
>  .../bindings/iommu/samsung,exynos4210-sysmmu.txt   |  103 ++
>  arch/arm/boot/dts/exynos4.dtsi                     |  122 +++
>  arch/arm/boot/dts/exynos4210.dtsi                  |   25 +
>  arch/arm/boot/dts/exynos4x12.dtsi                  |   82 ++
>  arch/arm/boot/dts/exynos5250.dtsi                  |  290 ++++++
>  drivers/clk/samsung/clk-exynos4.c                  |   27 +-
>  drivers/clk/samsung/clk-exynos5250.c               |   57 +-
>  drivers/iommu/Kconfig                              |    5 +-
>  drivers/iommu/exynos-iommu.c                       | 1061
> +++++++++++++------- 10 files changed, 1423 insertions(+), 375
> deletions(-)
> 
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