diff options
| -rw-r--r-- | drivers/gpu/drm/i915/i915_query.c | 75 | ||||
| -rw-r--r-- | include/uapi/drm/i915_drm.h | 62 |
2 files changed, 137 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/i915_query.c b/drivers/gpu/drm/i915/i915_query.c index 5582e6c3234a..3ace929dd90f 100644 --- a/drivers/gpu/drm/i915/i915_query.c +++ b/drivers/gpu/drm/i915/i915_query.c @@ -8,8 +8,83 @@ #include "i915_query.h" #include <uapi/drm/i915_drm.h> +static int query_topology_info(struct drm_i915_private *dev_priv, + struct drm_i915_query_item *query_item) +{ + const struct sseu_dev_info *sseu = &INTEL_INFO(dev_priv)->sseu; + struct drm_i915_query_topology_info topo; + u32 slice_length, subslice_length, eu_length, total_length; + + if (query_item->flags != 0) + return -EINVAL; + + if (sseu->max_slices == 0) + return -ENODEV; + + BUILD_BUG_ON(sizeof(u8) != sizeof(sseu->slice_mask)); + + slice_length = sizeof(sseu->slice_mask); + subslice_length = sseu->max_slices * + DIV_ROUND_UP(sseu->max_subslices, + sizeof(sseu->subslice_mask[0]) * BITS_PER_BYTE); + eu_length = sseu->max_slices * sseu->max_subslices * + DIV_ROUND_UP(sseu->max_eus_per_subslice, BITS_PER_BYTE); + + total_length = sizeof(topo) + slice_length + subslice_length + eu_length; + + if (query_item->length == 0) + return total_length; + + if (query_item->length < total_length) + return -EINVAL; + + if (copy_from_user(&topo, u64_to_user_ptr(query_item->data_ptr), + sizeof(topo))) + return -EFAULT; + + if (topo.flags != 0) + return -EINVAL; + + if (!access_ok(VERIFY_WRITE, u64_to_user_ptr(query_item->data_ptr), + total_length)) + return -EFAULT; + + memset(&topo, 0, sizeof(topo)); + topo.max_slices = sseu->max_slices; + topo.max_subslices = sseu->max_subslices; + topo.max_eus_per_subslice = sseu->max_eus_per_subslice; + + topo.subslice_offset = slice_length; + topo.subslice_stride = DIV_ROUND_UP(sseu->max_subslices, BITS_PER_BYTE); + topo.eu_offset = slice_length + subslice_length; + topo.eu_stride = + DIV_ROUND_UP(sseu->max_eus_per_subslice, BITS_PER_BYTE); + + if (__copy_to_user(u64_to_user_ptr(query_item->data_ptr), + &topo, sizeof(topo))) + return -EFAULT; + + if (__copy_to_user(u64_to_user_ptr(query_item->data_ptr + sizeof(topo)), + &sseu->slice_mask, slice_length)) + return -EFAULT; + + if (__copy_to_user(u64_to_user_ptr(query_item->data_ptr + + sizeof(topo) + slice_length), + sseu->subslice_mask, subslice_length)) + return -EFAULT; + + if (__copy_to_user(u64_to_user_ptr(query_item->data_ptr + + sizeof(topo) + + slice_length + subslice_length), + sseu->eu_mask, eu_length)) + return -EFAULT; + + return total_length; +} + static int (* const i915_query_funcs[])(struct drm_i915_private *dev_priv, struct drm_i915_query_item *query_item) = { + query_topology_info, }; int i915_query_ioctl(struct drm_device *dev, void *data, struct drm_file *file) diff --git a/include/uapi/drm/i915_drm.h b/include/uapi/drm/i915_drm.h index eedd5a23a944..7f5634ce8e88 100644 --- a/include/uapi/drm/i915_drm.h +++ b/include/uapi/drm/i915_drm.h @@ -1619,6 +1619,7 @@ struct drm_i915_perf_oa_config { struct drm_i915_query_item { __u64 query_id; +#define DRM_I915_QUERY_TOPOLOGY_INFO 1 /* * When set to zero by userspace, this is filled with the size of the @@ -1655,6 +1656,67 @@ struct drm_i915_query { __u64 items_ptr; }; +/* + * Data written by the kernel with query DRM_I915_QUERY_TOPOLOGY_INFO : + * + * data: contains the 3 pieces of information : + * + * - the slice mask with one bit per slice telling whether a slice is + * available. The availability of slice X can be queried with the following + * formula : + * + * (data[X / 8] >> (X % 8)) & 1 + * + * - the subslice mask for each slice with one bit per subslice telling + * whether a subslice is available. The availability of subslice Y in slice + * X can be queried with the following formula : + * + * (data[subslice_offset + + * X * subslice_stride + + * Y / 8] >> (Y % 8)) & 1 + * + * - the EU mask for each subslice in each slice with one bit per EU telling + * whether an EU is available. The availability of EU Z in subslice Y in + * slice X can be queried with the following formula : + * + * (data[eu_offset + + * (X * max_subslices + Y) * eu_stride + + * Z / 8] >> (Z % 8)) & 1 + */ +struct drm_i915_query_topology_info { + /* + * Unused for now. Must be cleared to zero. + */ + __u16 flags; + + __u16 max_slices; + __u16 max_subslices; + __u16 max_eus_per_subslice; + + /* + * Offset in data[] at which the subslice masks are stored. + */ + __u16 subslice_offset; + + /* + * Stride at which each of the subslice masks for each slice are + * stored. + */ + __u16 subslice_stride; + + /* + * Offset in data[] at which the EU masks are stored. + */ + __u16 eu_offset; + + /* + * Stride at which each of the EU masks for each subslice are stored. + */ + __u16 eu_stride; + + __u8 data[]; +}; + #if defined(__cplusplus) } #endif |