> -----Original Message----- > From: Hans Verkuil [mailto:hverkuil@xxxxxxxxx] > Sent: Saturday, July 24, 2010 6:13 AM > To: Sin, David > Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxxxxx; > linux-omap@xxxxxxxxxxxxxxx; Tony Lindgren; Russell King; > Kanigeri, Hari; Ohad Ben-Cohen; Hiremath, Vaibhav; Shilimkar, Santosh > Subject: Re: [RFC 0/8] TI TILER-DMM driver > > Hi David, > > On Saturday 24 July 2010 01:22:20 David Sin wrote: > > TILER is a hardware block made by Texas Instruments. Its > purpose is to > > organize video/image memory in a 2-dimensional fashion to > limit memory > > bandwidth and facilitate 0 effort rotation and mirroring. > The TILER > > driver facilitates allocating, freeing, as well as mapping > 2D blocks (areas) > > in the TILER container(s). It also facilitates rotating > and mirroring > > the allocated blocks or its rectangular subsections. > > Since this driver is part of the media/video subsystem you > should cross-post > it to the linux-media mailinglist as well. > > The main question that I have is how this driver is to be > used in practice. > How does it fit into the bigger video4linux picture? Is this > something that > is mainly used from other v4l or fb drivers? Or is it > controlled by userspace? [dhs] I missed this one -- my apologies. As I stated to Vaibhav, any device can use TILER memory, but there is a big advantage, performance-wise, for 2-Dimensional macro block based buffers. This HW is intended for image/video hardware accelerators (e.g. OMAP4 IVA-HD). Plus there's the added advantage of doing zero-copy flips and rotations for the OMAP display and image sub-systems. In this RFC, there are only kernel APIs to allocate TILER memory. Eventually, we would like to provide a way to obtain TILER memory to the user space. > > Regards, > > Hans > > > > > List of pending items in proposed order: > > > > * Add area packing support (multiple blocks can reside in > the same band/area) > > to optimize area use > > * Add group-ID support (to specify which blocks can reside > together in the > > same area) > > * Add multiple search directions to TCM-SiTA > > * Add 1D block support (including adding 1D search algo to TCM-SiTA) > > * Optimize mutex handling (don.t hold mutex during memory > > allocation/mapping/cache flushing) > > * Add block reference counting, support for sharing blocks > > * Move all kernel-API-s to tiler-iface.c > > * Support orphaned block support (in preparation for > process cleanup support) > > * Change block identification from physical address to key-ID pair > > (in preparation for user space support, and process security) > > * Add support for process security (blocks from separate > processes never > > reside in the same band) > > * Support file interface (ioctl and mmap) > > * Support for buffers (ordered list of blocks that are > mapped to userspace > > together, such as YUV420sp) > > * Support 1D user buffer mapping into TILER container > > * Support for block pre-reservation (to further optimize area use) > > > > David Sin (1): > > TILER-DMM: DMM-PAT driver for TI TILER > > > > Lajos Molnar (6): > > TILER-DMM: Container manager interface and utility definitons > > TILER-DMM: TILER Memory Manager interface and implementation > > TILER-DMM: TILER interface file and documentation > > TILER-DMM: Geometry and view manipulation functions. > > TILER-DMM: Main TILER driver implementation. > > TILER-DMM: Linking TILER driver into the Linux kernel build > > > > Ravi Ramachandra (1): > > TILER-DMM: Sample TCM implementation: Simple TILER Allocator > > > > Documentation/arm/TILER | 144 +++++++++ > > arch/arm/mach-omap2/include/mach/dmm.h | 128 ++++++++ > > arch/arm/mach-omap2/include/mach/tiler.h | 201 +++++++++++++ > > drivers/media/Kconfig | 6 + > > drivers/media/Makefile | 2 + > > drivers/media/video/tiler/Kconfig | 65 ++++ > > drivers/media/video/tiler/Makefile | 7 + > > drivers/media/video/tiler/_tiler.h | 51 ++++ > > drivers/media/video/tiler/dmm.c | 200 +++++++++++++ > > drivers/media/video/tiler/tcm.h | 209 +++++++++++++ > > drivers/media/video/tiler/tcm/Makefile | 1 + > > drivers/media/video/tiler/tcm/_tcm-sita.h | 64 ++++ > > drivers/media/video/tiler/tcm/tcm-sita.c | 459 > +++++++++++++++++++++++++++++ > > drivers/media/video/tiler/tcm/tcm-sita.h | 37 +++ > > drivers/media/video/tiler/tcm/tcm-utils.h | 54 ++++ > > drivers/media/video/tiler/tiler-geom.c | 360 > ++++++++++++++++++++++ > > drivers/media/video/tiler/tiler-iface.c | 106 +++++++ > > drivers/media/video/tiler/tiler-main.c | 426 > ++++++++++++++++++++++++++ > > drivers/media/video/tiler/tmm-pat.c | 274 +++++++++++++++++ > > drivers/media/video/tiler/tmm.h | 109 +++++++ > > 20 files changed, 2903 insertions(+), 0 deletions(-) > > create mode 100644 Documentation/arm/TILER > > create mode 100644 arch/arm/mach-omap2/include/mach/dmm.h > > create mode 100644 arch/arm/mach-omap2/include/mach/tiler.h > > create mode 100644 drivers/media/video/tiler/Kconfig > > create mode 100644 drivers/media/video/tiler/Makefile > > create mode 100644 drivers/media/video/tiler/_tiler.h > > create mode 100644 drivers/media/video/tiler/dmm.c > > create mode 100644 drivers/media/video/tiler/tcm.h > > create mode 100644 drivers/media/video/tiler/tcm/Makefile > > create mode 100644 drivers/media/video/tiler/tcm/_tcm-sita.h > > create mode 100644 drivers/media/video/tiler/tcm/tcm-sita.c > > create mode 100644 drivers/media/video/tiler/tcm/tcm-sita.h > > create mode 100644 drivers/media/video/tiler/tcm/tcm-utils.h > > create mode 100644 drivers/media/video/tiler/tiler-geom.c > > create mode 100644 drivers/media/video/tiler/tiler-iface.c > > create mode 100644 drivers/media/video/tiler/tiler-main.c > > create mode 100644 drivers/media/video/tiler/tmm-pat.c > > create mode 100644 drivers/media/video/tiler/tmm.h > > > > -- > > To unsubscribe from this list: send the line "unsubscribe > linux-omap" in > > the body of a message to majordomo@xxxxxxxxxxxxxxx > > More majordomo info at http://vger.kernel.org/majordomo-info.html > > > > > > -- > Hans Verkuil - video4linux developer - sponsored by TANDBERG, > part of Cisco > -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
