Hello, This patch series introduces new type of videbuf2 memory allocator - vb2-s5p-iommu. This allocator can be used only on Samsung SoCs that have IOMMU module. Currently only Samsung EXYNOS4 (former S5PV310) platform has SYSMMU modules. The allocator is then used by s5p-fimc driver. To make it possible some additional changes are required. Mainly platform support for s5p-fimc for EXYNOS4 machines need to be defined. The proposed solution has been tested on Universal C210 board (Samsung S5PC210/EXYNOS4 based). We decided to use driver private address space mode of the iommu driver. This way each vb2-s5p-iommu client gets it's own address space for memory buffers. This reduces kernel virtual memory fragmentation as well as solves some non-trivial page table updates issues. The drawback is the fact that the interface for s5p-sysmmu has been changed. This IOMMU allocator has no dependences on other subsystems besides Samsung platfrom core. We also ported s5p-mfc and s5p-tv drivers to this allocator, they will be posted in separate patch series. This will enable to get them working on EXYNOS4 (S5PV310) platform. Support for S5PV210/S5PC110 platform still depends on CMA allocator that needs more discussion on memory management mailing list and development. The patches with updated s5p-mfc and s5p-tv drivers will follow. To get FIMC module working on EXYNOS4/UniversalC210 board we also added support for power domains and power gating. This patch series contains a collection of patches for various platform subsystems. Here is a detailed list: [PATCH 1/7] ARM: S5PV310: Add platform definitions for FIMC - adds basic platform resources for FIMC modules (for s5p-fimc driver) [PATCH 2/7] ARM: S5PV310: power domains: fixes and code cleanup - adds support for block gating in Samsung power domain driver and performs some cleanup [PATCH 3/7] ARM: Samsung: update/rewrite Samsung SYSMMU (IOMMU) driver - a complete rewrite of sysmmu driver for Samsung platform: - the new version introduces device private page tables (address space) mode - simplified the resource management (no more horrible single platform device with 32 resources is needed) - some other API chages required by upcoming videobuf2 allocator [PATCH 4/7] v4l: videobuf2: add Samsung SYSMMU (IOMMU) based allocator - introduces new memory allocator for videobuf2, it uses s5p-sysmmu iommu driver, memory for video buffers is acuired by alloc_page() kernel function [PATCH 5/7] s5p-fimc: add pm_runtime support - adds support for pm_runtime in s5p-fimc driver [PATCH 6/7] s5p-fimc: Add support for vb2-s5p-iommu allocator - adds support for the newly introduces videbuf2-s5p-iommu allocator on EXYNOS4 platform [PATCH 7/7] ARM: S5PC210: enable FIMC on Universal_C210 - adds all required machine definitions to get FIMC modules working on Universal C210 boards The patch series is based on git://linuxtv.org/media_tree.git tree, staging/for_v2.6.39 branch with the following Samsung platform patches: 1. [PATCH] ARM: Samsung: change suspend/resume code to depend on CONFIG_SUSPEND http://www.mail-archive.com/linux-samsung-soc@xxxxxxxxxxxxxxx/msg04025.html 2. [PATCH v2] ARM: S5PC210: add support for i2c PMICs on Universal_C210 board http://www.mail-archive.com/linux-samsung-soc@xxxxxxxxxxxxxxx/msg04029.html This series has not been rebased onto the latest changes (S5PV310 renamed to EXYNOS4) in git://git.kernel.org/pub/scm/linux/kernel/git/kgene/linux-samsung.git, for-next branch. We will rebase them soon, but first we want to get feedback and comments on the s5p-iommu videobuf2 allocator idea. Best regards -- Marek Szyprowski Samsung Poland R&D Center Complete patch summary: Andrzej Pietrasiewicz (2): ARM: Samsung: update/rewrite Samsung SYSMMU (IOMMU) driver v4l: videobuf2: add Samsung SYSMMU (IOMMU) based allocator Marek Szyprowski (3): s5p-fimc: add pm_runtime support s5p-fimc: Add support for vb2-s5p-iommu allocator ARM: S5PC210: enable FIMC on Universal_C210 Sylwester Nawrocki (1): ARM: S5PV310: Add platform definitions for FIMC Tomasz Stanislawski (1): ARM: S5PV310: power domains: fixes and code cleanup arch/arm/mach-s5pv310/Kconfig | 6 + arch/arm/mach-s5pv310/clock.c | 91 ++ arch/arm/mach-s5pv310/cpu.c | 7 + arch/arm/mach-s5pv310/dev-pd.c | 93 ++- arch/arm/mach-s5pv310/dev-sysmmu.c | 582 +++++++++---- arch/arm/mach-s5pv310/include/mach/irqs.h | 40 +- arch/arm/mach-s5pv310/include/mach/map.h | 8 + arch/arm/mach-s5pv310/include/mach/regs-clock.h | 12 + arch/arm/mach-s5pv310/include/mach/regs-sysmmu.h | 23 +- arch/arm/mach-s5pv310/include/mach/sysmmu.h | 122 --- arch/arm/mach-s5pv310/mach-universal_c210.c | 20 + arch/arm/plat-s5p/Kconfig | 22 +- arch/arm/plat-s5p/Makefile | 1 + arch/arm/plat-s5p/dev-fimc3.c | 43 + arch/arm/plat-s5p/include/plat/sysmmu.h | 127 +++ arch/arm/plat-s5p/sysmmu.c | 988 +++++++++++++++------- arch/arm/plat-samsung/include/plat/devs.h | 3 +- arch/arm/plat-samsung/include/plat/fimc-core.h | 5 + arch/arm/plat-samsung/include/plat/pd.h | 1 + drivers/media/video/Kconfig | 11 +- drivers/media/video/Makefile | 1 + drivers/media/video/s5p-fimc/fimc-capture.c | 9 +- drivers/media/video/s5p-fimc/fimc-core.c | 36 +- drivers/media/video/s5p-fimc/fimc-mem.h | 87 ++ drivers/media/video/videobuf2-s5p-iommu.c | 444 ++++++++++ include/media/videobuf2-s5p-iommu.h | 50 ++ 26 files changed, 2129 insertions(+), 703 deletions(-) rewrite arch/arm/mach-s5pv310/dev-sysmmu.c (86%) delete mode 100644 arch/arm/mach-s5pv310/include/mach/sysmmu.h create mode 100644 arch/arm/plat-s5p/dev-fimc3.c create mode 100644 arch/arm/plat-s5p/include/plat/sysmmu.h rewrite arch/arm/plat-s5p/sysmmu.c (85%) create mode 100644 drivers/media/video/s5p-fimc/fimc-mem.h create mode 100644 drivers/media/video/videobuf2-s5p-iommu.c create mode 100644 include/media/videobuf2-s5p-iommu.h -- 1.7.1.569.g6f426 -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
