On Sat, Feb 1, 2014 at 1:16 PM, Alexandre Courbot <acourbot@xxxxxxxxxx> wrote: > Hello everyone, Hey Alex, The series looks pretty good to me. I'll reply to the relevant patches with any minor nit-picks on top of what's already been said by others. Thank you, and welcome to Nouveau :) Ben. > > GK20A is the Kepler-based GPU used in the upcoming Tegra K1 chips. The following > patches perform architectural changes to Nouveau that are necessary to support > non-PCI GPUs and add initial support for GK20A. Although the support is still > very basic and more user-space changes will be needed to make the full graphics > stack run on top of it, we were able to successfully open channels and run > simple pushbuffers with libdrm (more testing including rendering is in progress > as we get more familiar with Nouveau's user-space interface). > > This work should be considered as a RFC and a proof-of-concept for driving > future Tegra GPUs with Nouveau. Some design choices need to be discussed and > quite a few inelegant shortcuts were purposely taken to minimize the size of > this first set. Or said otherwise, apart from the changes that add support for > non-PCI GPUs, remarkably little code needs to be added to get GK20A to a point > where it is actually running. This is very encouraging, and it will be > interesting to keep improving this support and see where this gets us. > > The first part of this series (patches 01/09) adds support for platform devices > to Nouveau. Nouveau currently only supports PCI devices, and GK20A uses the > platform bus and Device Tree. So the first step towards GK20A support is to > abstract the PCI functions used by Nouveau (mainly resources range querying and > page mapping functions) and add platform device probing functions. For most of > the existing chips, platform device support does not make any sense, so only the > subdev and engine drivers actually used by GK20A were updated to use these > abstractions. If, for consistency reasons, it is deemed preferable to use them > everywhere in the driver, we will do it in the next revision of this series. > > This part can be considered independently from the actual GK20A support, and I > believe it would make sense to discuss what needs to be improved and drive it to > merge separately, as the remainder of the series will likely require more work. > > The second part (10/14) updates existing subdev/engine drivers to support GK20A, > and adds a very simple memory driver that simulates dedicated video memory by > allocating a large system memory chunk at boot time. This is clearly sub-optimal > and should not be merged, but allowed us to quickly bring GK20A up with Nouveau. > Other drivers changes are fairly small, and are here to handle the difference in > number of engines and units compared to desktop Kepler as well as to perform a > few things usually done by the video BIOS (which Tegra does not feature). > > Finally, support for probing GK20A is added in the last 2 patches. It should be > noted that contrary to what Nouveau currently expects, GK20A does not embed any > display hardware (that part being handled by tegradrm). So this driver should > really be only used through DRM render-nodes and collaborate with the display > driver using PRIME. I have not yet figured out how to turn GK20A's instantiation > of Nouveau into a render-node only driver without breaking support for existing > desktop GPUs, and consequently the driver spawns a /dev/dri/cardX node which we > should try to get rid of. > > I guess my email address might surprise some of you, so let me anticipate some > questions you might have. :P Yes, this work is endorsed by NVIDIA. Several other > NVIDIAns (CC'd), including core GPU experts, have provided significant technical > guidance and will continue their involvement. Special thanks go to Terje > Bergstrom and Ken Adams for their invaluable GPU expertise, and Thierry Reding > (at FOSDEM this weekend) for help with debugging and user-space testing. > > Let me also stress that although very exciting, this effort is still > experimental, so I would like to make sure that nobody makes excessive > expectations based on these few patches. The scope of this work is strictly > limited to Tegra (although given the similarities desktop GPU support will > certainly benefit from it indirectly), and we do not have any plan to work on > user-space support. So do not uninstall that proprietary driver just yet. ;) > > With this being clarified, we are looking forward to getting your feedback and > working with you guys to bring and improve Tegra K1 support into Nouveau! :) > > Alexandre Courbot (16): > drm/nouveau: handle -EACCES runtime PM return code > drm/nouveau: basic support for platform devices > drm/nouveau: add platform device probing function > drm/nouveau/fifo: support platform devices > drm/nouveau/bar: support platform devices > drm/nouveau/bar: only ioremap BAR3 if it exists > drm/nouveau/bar/nvc0: support chips without BAR3 > drm/nouveau/mc: support platform devices > drm/nouveau/fb: support platform devices > drm/nouveau/timer: skip calibration on GK20A > drm/nouveau/fifo: allocate usermem as needed > drm/nouveau/fifo: add GK20A support > drm/nouveau/ibus: add GK20A support > drm/nouveau/fb: add GK20A support > drm/nouveau: support GK20A in nouveau_accel_init() > drm/nouveau: support for probing GK20A > > drivers/gpu/drm/nouveau/Makefile | 4 + > drivers/gpu/drm/nouveau/core/engine/device/base.c | 92 +++++++++++++++- > drivers/gpu/drm/nouveau/core/engine/device/nve0.c | 20 ++++ > drivers/gpu/drm/nouveau/core/engine/fifo/base.c | 2 +- > drivers/gpu/drm/nouveau/core/engine/fifo/nve0.c | 4 +- > drivers/gpu/drm/nouveau/core/engine/fifo/nve0.h | 1 + > drivers/gpu/drm/nouveau/core/engine/fifo/nvea.c | 27 +++++ > drivers/gpu/drm/nouveau/core/include/core/device.h | 27 +++++ > .../gpu/drm/nouveau/core/include/engine/device.h | 10 ++ > drivers/gpu/drm/nouveau/core/include/engine/fifo.h | 1 + > drivers/gpu/drm/nouveau/core/include/subdev/fb.h | 1 + > drivers/gpu/drm/nouveau/core/include/subdev/ibus.h | 1 + > drivers/gpu/drm/nouveau/core/include/subdev/mc.h | 1 + > drivers/gpu/drm/nouveau/core/os.h | 1 + > drivers/gpu/drm/nouveau/core/subdev/bar/base.c | 7 +- > drivers/gpu/drm/nouveau/core/subdev/bar/nv50.c | 4 +- > drivers/gpu/drm/nouveau/core/subdev/bar/nvc0.c | 116 +++++++++++---------- > drivers/gpu/drm/nouveau/core/subdev/fb/nvc0.c | 9 +- > drivers/gpu/drm/nouveau/core/subdev/fb/nvea.c | 28 +++++ > drivers/gpu/drm/nouveau/core/subdev/fb/priv.h | 1 + > drivers/gpu/drm/nouveau/core/subdev/fb/ramnvea.c | 67 ++++++++++++ > drivers/gpu/drm/nouveau/core/subdev/ibus/nvea.c | 108 +++++++++++++++++++ > drivers/gpu/drm/nouveau/core/subdev/mc/base.c | 43 +++++--- > drivers/gpu/drm/nouveau/core/subdev/timer/nv04.c | 19 ++-- > drivers/gpu/drm/nouveau/dispnv04/crtc.c | 2 +- > drivers/gpu/drm/nouveau/nouveau_abi16.c | 13 ++- > drivers/gpu/drm/nouveau/nouveau_bo.c | 22 ++-- > drivers/gpu/drm/nouveau/nouveau_connector.c | 2 +- > drivers/gpu/drm/nouveau/nouveau_display.c | 3 +- > drivers/gpu/drm/nouveau/nouveau_drm.c | 86 ++++++++++++--- > drivers/gpu/drm/nouveau/nouveau_sysfs.c | 8 +- > drivers/gpu/drm/nouveau/nouveau_ttm.c | 31 +++--- > 32 files changed, 622 insertions(+), 139 deletions(-) > create mode 100644 drivers/gpu/drm/nouveau/core/engine/fifo/nvea.c > create mode 100644 drivers/gpu/drm/nouveau/core/subdev/fb/nvea.c > create mode 100644 drivers/gpu/drm/nouveau/core/subdev/fb/ramnvea.c > create mode 100644 drivers/gpu/drm/nouveau/core/subdev/ibus/nvea.c > > -- > 1.8.5.3 > > _______________________________________________ > dri-devel mailing list > dri-devel@xxxxxxxxxxxxxxxxxxxxx > http://lists.freedesktop.org/mailman/listinfo/dri-devel -- To unsubscribe from this list: send the line "unsubscribe linux-tegra" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
