On Thu Apr 17, 2025 at 1:20 AM CEST, Dmitry Baryshkov wrote: > On Wed, Mar 19, 2025 at 07:52:20AM -0700, Rob Clark wrote: >> From: Rob Clark <[email protected]> >> >> It is standing in the way of drm_gpuvm / VM_BIND support. Not to >> mention frequently broken and rarely tested. And I think only needed >> for a 10yr old not quite upstream SoC (msm8974). > > Well... MSM8974 is quite upstream, but anyway, let's drop it. Maybe > somebody will write an IOMMU driver.
msm8226 is also using this! Sad to see this happening, but I get the reasoning. Unfortunately nobody who really knows GPU and IOMMU bits has looked at this in recent years, for msm8974 we (mostly Matti Lehtimäki and me) have a semi-working branch but hitting random issues with it. Would've been nice if somebody made functional IOMMU support back in like 2015-2016 when more people looked at this platform. Regards Luca > >> >> Maybe we can add support back in later, but I'm doubtful. >> >> Signed-off-by: Rob Clark <[email protected]> >> --- >> drivers/gpu/drm/msm/adreno/a2xx_gpu.c | 6 +- >> drivers/gpu/drm/msm/adreno/a3xx_gpu.c | 13 +- >> drivers/gpu/drm/msm/adreno/a4xx_gpu.c | 13 +- >> drivers/gpu/drm/msm/adreno/adreno_device.c | 4 - >> drivers/gpu/drm/msm/adreno/adreno_gpu.h | 1 - >> drivers/gpu/drm/msm/msm_drv.c | 117 +----------------- >> drivers/gpu/drm/msm/msm_drv.h | 11 -- >> drivers/gpu/drm/msm/msm_gem.c | 131 ++------------------- >> drivers/gpu/drm/msm/msm_gem.h | 5 - >> drivers/gpu/drm/msm/msm_gem_submit.c | 5 - >> 10 files changed, 19 insertions(+), 287 deletions(-)
