On Tue, Sep 28, 2021 at 11:36:51PM +0300, Lisovskiy, Stanislav wrote: > On Tue, Sep 28, 2021 at 10:02:34PM +0300, Ville Syrjälä wrote: > > On Tue, Sep 28, 2021 at 03:49:11PM +0300, Lisovskiy, Stanislav wrote: > > > On Mon, Sep 27, 2021 at 10:24:11PM -0700, Matt Roper wrote: > > > > On Mon, Sep 27, 2021 at 09:29:07PM +0300, Ville Syrjälä wrote: > > > > > On Mon, Sep 27, 2021 at 11:23:35AM -0700, Matt Roper wrote: > > > > > > On Thu, Sep 23, 2021 at 06:49:59PM +0300, Ville Syrjälä wrote: > > > > > > > On Thu, Sep 23, 2021 at 11:48:58AM +0300, Stanislav Lisovskiy > > > > > > > wrote: > > > > > > > > TileF(Tile4 in bspec) format is 4K tile organized into > > > > > > > > 64B subtiles with same basic shape as for legacy TileY > > > > > > > > which will be supported by Display13. > > > > > > > > > > > > > > Why we still haven't done the F->tile64 rename? > > > > > > > > > > > > > > This is the last chance to fix this before we bake > > > > > > > this into the uapi and are stuck with a name that doesn't > > > > > > > match the spec and will just confuse everyone. > > > > > > > > > > > > I think you're confusing the formats here. The bspec uses both > > > > > > terms > > > > > > "TileF" and "Tile4" for the same format in different places. > > > > > > There's a > > > > > > completely different format that's referred to as both "TileS" and > > > > > > "Tile64" in the bspec that we don't use at the moment. So tile64 > > > > > > wouldn't be a correct rename, but tile4 could be. > > > > > > > > > > Right, tile64 is the macro tile variant I think. So like Ys > > > > > which we never bothered implementing, so I guess we''l not bother > > > > > with tile64 either. > > > > > > > > > > > > > > > > > In general Tile4 is much more common in the bspec than TileF is > > > > > > (TileF > > > > > > terminology is mostly found in the media sections). And bspec > > > > > > 44917 is > > > > > > the most authoritative bspec page on the subject, and it refers to > > > > > > it as > > > > > > Tile4, so I agree that switching over "Tile4" would probably be a > > > > > > good > > > > > > move. > > > > > > > > > > > > > > > > > > > > > > > > > > > ... > > > > > > > > diff --git a/include/uapi/drm/i915_drm.h > > > > > > > > b/include/uapi/drm/i915_drm.h > > > > > > > > index bde5860b3686..d7dc421c6134 100644 > > > > > > > > --- a/include/uapi/drm/i915_drm.h > > > > > > > > +++ b/include/uapi/drm/i915_drm.h > > > > > > > > @@ -1522,7 +1522,8 @@ struct drm_i915_gem_caching { > > > > > > > > #define I915_TILING_NONE 0 > > > > > > > > #define I915_TILING_X 1 > > > > > > > > #define I915_TILING_Y 2 > > > > > > > > -#define I915_TILING_LAST I915_TILING_Y > > > > > > > > +#define I915_TILING_F 3 > > > > > > > > +#define I915_TILING_LAST I915_TILING_F > > > > > > > > > > > > > > fences... > > > > > > > > > > > > Recognizing TileF/Tile4 separately from TileY is important to code > > > > > > outside of display as well. There are blitter instructions that > > > > > > require > > > > > > different settings for TileY vs Tile4/F so if we drop the tracking > > > > > > of > > > > > > this as a unique tiling type, it will break the blitting/copying and > > > > > > some of the upcoming local memory support for Xe_HP-based platforms. > > > > > > > > > > These are uapi definitions for set_tiling(). You are not meant to add > > > > > anything there. Just like we didn't add anything for Yf. > > > > > > > > Yeah, I think that's the real problem --- we define some values here in > > > > the uapi header, but we also wind up using the same set of values for > > > > driver-internal non-uapi purposes too rather than having a separate enum > > > > (containing a superset of the uapi values) that can be used for those > > > > other things. Display code can use FB modifiers for some things, but > > > > core/lmem code needs a way to refer to Tile4 and such and doesn't have a > > > > good way to do that today. > > > > > > > > I think most (all?) of the non-display code that's relying on a > > > > definition of I915_TILING_F is in various selftests that are still being > > > > prepared for upstreaming, so maybe there's a better way to handle the > > > > selection of possible formats specifically in the selftest code itself. > > > > That's really the only area of the kernel code that should need to be > > > > aware of the specific internal layout of various buffers. > > > > > > So I will proceed with the renaming at least. > > > > > > Ville, suppose, I still need part of fencing related code? > > > > Nah. Just nuke it all. Someone will have to fix whatever self test is > > abusing the uapi definitions though. > > > > A local #define should suffice if nothing else is deemed appropriate. > > IIRC igt also has a local definition like this for Yf. We should > > perhaps rename those to some igt specific namespace as well... > > As Matt mentioned, removing I915_TILING_F completely is going to break > way more than selftest, but also blitter/copy and local mem support.
No. The only non-fence use of I915_TILING_F I see is a blitter self test of some sort. > In fact I remember, I had to add part of those in order to get some > tests working, another part was added by somebody else, so not even > sure how much other stuff its going to break. > > Sounds like a bit too much for simple upstreaming of the patch, we > already had internally for more than a year, just wondering why > this popped up only by now. Because someone tried to sneak in gem uapi additions under the cover of darkness? All gem changes must be cc:dri-devel btw, uapi doubly so. Oh, and drm_fourcc.h changes really need to go there too. -- Ville Syrjälä Intel