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<dcz_> hi! can I get a writeable fd using gbm_buf_create? I tried gbm_bo_get_fd, but that can only mmap read-only
<dcz_> I tried to compromise and use gbm_bo_write, but for some reasonc the creation with GBM_BO_USE_LINEAR | GBM_BO_USE_WRITE fails
<dcz_> I'll try gbm_bo_map next...
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<dcz_> (funnily enough, writing the fd works on intel, but not on etnaviv)
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<pq> dcz_, I think gbm_bo_map() is the intended way. USE_WRITE is some secret hand-shake for essentially "this is a cursor".
<pq> oh, right, USE_WRITE works only for USE_CURSOR
<dcz_> is it possible to get a writeable fd instead?
<pq> I've never heard anyone asking that before...
<dcz_> basically what I'm looking for is a dmabuf
<dcz_> as far as I know those are shared as fds
<pq> yeah, but they are not regular files
<dcz_> is mmap not the intended way to access dmabuf contents?
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<pq> I don't know the kernel side of the story, but I can imagine that supporting read() and write() could be complicated. The memory may not be CPU-accessible.
<pq> So you have gbm_bo_map() with the direction flags, so that if the driver needs to, it can use a staging buffer and perhaps make use of DMA.
<pq> dcz_, no, mmap is not the primary (or even always guaranteed) way to access dmabuf contents.
<dcz_> huh, I guess that's the source of my confusion. I thought the interface abstracted away the implementation details
<dcz_> thanks
<pq> nowadays you might get away with mmap() a dmabuf, but that's still very tricky because you need to understand the format+modifier.
<pq> gbm_bo_map() OTOH guarantees a linear view into the buffer
<dcz_> thanks, I'll give up on mmapping for now. I don't *need* it anyway
<pq> mmap() also cannot give you a staging buffer, which means that your access could be radically slower than if the driver used a staging buffer and did copies in and out.
<jekstrand> Yeah, mmap on the dma-buf FD may not be the optimal path
<dcz_> so the receiver of the dmabuf must know what kind of a backing device has been used on the other side
<pq> for what all this implies under the hood, I would not be surprised if dmabuf fd simply doesn't support read() or write()
<pq> dcz_, I think there are kernel internal interfaces for that.
<pq> userspace just gets the dmabuf fd from one driver/device and passes it on to another (or the same) driver/device
<pq> and usually not for direct CPU access
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<eric_engestrom> bl4ckb0ne: with XDC this week, many devs might not see this MR until next week (and they might have a lot to come back to so it might be longer)
<bl4ckb0ne> ah yes, forgot about XDC
<bl4ckb0ne> I don't mind rebasing my branches on it until next week
<eric_engestrom> I'd be inclined to wait if that's ok with you
<eric_engestrom> (forgot to hit send on that second message ^^)
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<bl4ckb0ne> yeah no problem at all
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<zehortigoza> There are conflicts when rebuilding drm-tip over amdgpu patches, can someone from amdgpu take a look at it?
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<dcz_> pq: gbm_bo_map works, but I don't like how it needs specifying shape. gbm only supports ARGB, whereas my data will be grayscale 8bpp, meaning that the interface is too high level for me and it ends up being hacky
<dcz_> I hope it doesn't mangle the pixels on the way...
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<demarchi> zehortigoza: got the same issue: Merging drm/drm-next... dim:
<demarchi> dim: FAILURE: Could not merge drm/drm-next
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<vsyrjala> danvet: agd5f: drm-tip conflict looks to be due to the last minute amdgpu drm-fixes pull
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<emersion> dcz_: there is R8
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<tursulin> vsyrjala: I've just fixed that - hopefully at least.. it builds
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<dcz_> emersion: line 73 here is what I mean https://github.com/anholt/mesa/blob/master/src/gbm/main/gbm.h
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<daniels> dcz_: gbm_bo_format isn't actually used for the most part
<daniels> all the allocation functions accept the GBM_FORMAT_* fourccs instead
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<dcz_> oh, I actually used it this way in my code without noticing
<dcz_> I think I did some testing before, and nothing but argb actually worked due to lack of support on etnaviv
<dcz_> there were no valid egl configs
<daniels> are you trying to render to an R8 buffer ... ?
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<dcz_> ..I mixed up something
<dcz_> no, the u8 is the source buffer
<daniels> right, you don't need an EGLConfig for that, you just import it as an EGLImage
<daniels> but if you're allocating it and mapping it to write into with the CPU, you might well be better off just doing plain old glTexImage2D
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<dcz_> huh, you're right. All my config code is dead, and I have no recollection of doing that
<dcz_> actually, no: the config is used to create egl context, and that context to call eglMakeCurrent
<dcz_> ...and I don't really know what that eglMakeCurrent is doing :P the state gets modified implicitly, not sure how to follow that
<daniels> eglMakeCurrent makes the specified EGL context the current one, which will be operated on by everything from the client API
<daniels> so it will e.g. make the GL rendering calls (none of which take a ctx param) operate against the newly-current ctx
<daniels> EGLConfigs are generally used for your rendering though, not your texturing
<daniels> it sounds like you've got a bit of a tangled mess tbh; I would probably start with the basic rendering + texturing looking more like normal GL, and work up from there
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<dcz_> I don't really understand the model, and I am hoping I can either get away without trying it, or I find a resource that actually tells me what's going on
<dcz_> it's been like getting blood out of a stone trying to get good, general descriptions of gbm (and egl+opengl too to a lesser extent)
<daniels> GBM is auxiliary here; all it does is provide you a way to allocate and access memory (for relatively limited purposes), and allow you to make those allocations visible to EGL as well
<daniels> stuff like EGLConfigs are probably something for a more general OpenGL guide like https://open.gl
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<dcz_> daniels: thanks, I'll take a look at that
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<dcz_> aaaand, after some extra self-inflicted pain, I get to write a buffer. Thanks all! I'll clean it up a bit next
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<FireBurn> Hey, now the rusticl radeonsi fixes have landed, any idea how you use it?
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<airlied> FireBurn: I think there's a lot more fixes required
<FireBurn> Aww
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