From aa2bdc4843f5871e6c68fbec5e10c0dbaf10ff91 Mon Sep 17 00:00:00 2001 From: Matt Roper Date: Wed, 1 Jun 2022 08:07:21 -0700 Subject: [PATCH] drm/i915/xehp: Drop GETPARAM lookups of I915_PARAM_[SUB]SLICE_MASK Slice/subslice/EU information should be obtained via the topology queries provided by the I915_QUERY interface; let's turn off support for the old GETPARAM lookups on Xe_HP and beyond where we can't return meaningful values. The slice mask lookup is meaningless since Xe_HP doesn't support traditional slices (and we make no attempt to return the various new units like gslices, cslices, mslices, etc.) here. The subslice mask lookup is even more problematic; given the distinct masks for geometry vs compute purposes, the combined mask returned here is likely not what userspace would want to act upon anyway. The value is also limited to 32-bits by the nature of the GETPARAM ioctl which is sufficient for the initial Xe_HP platforms, but is unable to convey the larger masks that will be needed on other upcoming platforms. Finally, the value returned here becomes even less meaningful when used on multi-tile platforms where each tile will have its own masks. Signed-off-by: Matt Roper Acked-by: Tvrtko Ursulin Acked-by: Lionel Landwerlin # mesa Reviewed-by: Balasubramani Vivekanandan Link: https://patchwork.freedesktop.org/patch/msgid/20220601150725.521468-3-matthew.d.roper@intel.com --- drivers/gpu/drm/i915/i915_getparam.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/drivers/gpu/drm/i915/i915_getparam.c b/drivers/gpu/drm/i915/i915_getparam.c index c12a0adefda53..ac9767c56619c 100644 --- a/drivers/gpu/drm/i915/i915_getparam.c +++ b/drivers/gpu/drm/i915/i915_getparam.c @@ -148,11 +148,19 @@ int i915_getparam_ioctl(struct drm_device *dev, void *data, value = intel_engines_has_context_isolation(i915); break; case I915_PARAM_SLICE_MASK: + /* Not supported from Xe_HP onward; use topology queries */ + if (GRAPHICS_VER_FULL(i915) >= IP_VER(12, 50)) + return -EINVAL; + value = sseu->slice_mask; if (!value) return -ENODEV; break; case I915_PARAM_SUBSLICE_MASK: + /* Not supported from Xe_HP onward; use topology queries */ + if (GRAPHICS_VER_FULL(i915) >= IP_VER(12, 50)) + return -EINVAL; + /* Only copy bits from the first slice */ memcpy(&value, sseu->subslice_mask, min(sseu->ss_stride, (u8)sizeof(value))); -- 2.30.2