[Intel-gfx] [PATCH v11 6/6] drm/i915: expose rcs topology through query uAPI
Tvrtko Ursulin
tvrtko.ursulin at linux.intel.com
Mon Jan 22 09:44:06 UTC 2018
On 22/01/2018 08:21, Lionel Landwerlin wrote:
> With the introduction of asymmetric slices in CNL, we cannot rely on
> the previous SUBSLICE_MASK getparam to tell userspace what subslices
> are available. Here we introduce a more detailed way of querying the
> Gen's GPU topology that doesn't aggregate numbers.
>
> This is essential for monitoring parts of the GPU with the OA unit,
> because counters need to be normalized to the number of
> EUs/subslices/slices. The current aggregated numbers like EU_TOTAL do
> not gives us sufficient information.
>
> As a bonus we can draw representations of the GPU :
>
> https://imgur.com/a/vuqpa
>
> v2: Rename uapi struct s/_mask/_info/ (Tvrtko)
> Report max_slice/subslice/eus_per_subslice rather than strides (Tvrtko)
> Add uapi macros to read data from *_info structs (Tvrtko)
>
> v3: Use !!(v & DRM_I915_BIT()) for uapi macros instead of custom shifts (Tvrtko)
>
> v4: factorize query item writting (Tvrtko)
> tweak uapi struct/define names (Tvrtko)
>
> v5: Replace ALIGN() macro (Chris)
>
> v6: Updated uapi comments (Tvrtko)
> Moved flags != 0 checks into vfuncs (Tvrtko)
>
> v7: Use access_ok() before copying anything, to avoid overflows (Chris)
> Switch BUG_ON() to GEM_WARN_ON() (Tvrtko)
>
> v8: Tweak uapi comments style to match the coding style (Lionel)
>
> v9: Fix error in comment about computation of enabled subslice (Tvrtko)
>
> Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin at intel.com>
> ---
> drivers/gpu/drm/i915/i915_query.c | 110 ++++++++++++++++++++++++++++++++++++++
> include/uapi/drm/i915_drm.h | 71 ++++++++++++++++++++++++
> 2 files changed, 181 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/i915_query.c b/drivers/gpu/drm/i915/i915_query.c
> index 5aa886313cf9..ff87ec8a321a 100644
> --- a/drivers/gpu/drm/i915/i915_query.c
> +++ b/drivers/gpu/drm/i915/i915_query.c
> @@ -25,8 +25,118 @@
> #include "i915_drv.h"
> #include <uapi/drm/i915_drm.h>
>
> +static int copy_query_data(struct drm_i915_query_item *query_item,
> + const void *item_ptr, u32 item_length,
> + const void *data_ptr, u32 data_length)
> +{
> + u32 total_length = item_length + data_length;
> +
> + if (GEM_WARN_ON(add_overflows(item_length, data_length)))
> + return -EINVAL;
> +
> + if (query_item->length == 0)
> + return total_length;
> +
> + if (query_item->length < total_length)
> + return -EINVAL;
> +
> + if (!access_ok(VERIFY_WRITE, u64_to_user_ptr(query_item->data_ptr),
> + total_length))
> + return -EFAULT;
> +
> + if (__copy_to_user(u64_to_user_ptr(query_item->data_ptr),
> + item_ptr, item_length))
> + return -EFAULT;
> +
> + if (__copy_to_user(u64_to_user_ptr(query_item->data_ptr + item_length),
> + data_ptr, data_length))
> + return -EFAULT;
> +
> + return total_length;
> +}
> +
> +static int query_slice_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_slice_info slice_info;
> +
> + if (query_item->flags != 0)
> + return -EINVAL;
> +
> + if (sseu->max_slices == 0)
> + return -ENODEV;
> +
> + /*
> + * If we ever change the internal slice mask data type, we'll need to
> + * update this function.
> + */
> + BUILD_BUG_ON(sizeof(u8) != sizeof(sseu->slice_mask));
> +
> + memset(&slice_info, 0, sizeof(slice_info));
> + slice_info.max_slices = sseu->max_slices;
> +
> + return copy_query_data(query_item, &slice_info, sizeof(slice_info),
> + &sseu->slice_mask, sizeof(sseu->slice_mask));
> +}
> +
> +static int query_subslice_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_subslice_info subslice_info;
> + u32 data_length;
> +
> + if (query_item->flags != 0)
> + return -EINVAL;
> +
> + if (sseu->max_slices == 0)
> + return -ENODEV;
> +
> + memset(&subslice_info, 0, sizeof(subslice_info));
> + subslice_info.max_slices = sseu->max_slices;
> + subslice_info.max_subslices = sseu->max_subslices;
> +
> + data_length = subslice_info.max_slices *
> + DIV_ROUND_UP(subslice_info.max_subslices,
> + sizeof(sseu->subslice_mask[0]) * BITS_PER_BYTE);
> +
> + return copy_query_data(query_item,
> + &subslice_info, sizeof(subslice_info),
> + sseu->subslice_mask, data_length);
> +}
> +
> +static int query_eu_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_eu_info eu_info;
> + u32 data_length;
> +
> + if (query_item->flags != 0)
> + return -EINVAL;
> +
> + if (sseu->max_slices == 0)
> + return -ENODEV;
> +
> + memset(&eu_info, 0, sizeof(eu_info));
> + eu_info.max_slices = sseu->max_slices;
> + eu_info.max_subslices = sseu->max_subslices;
> + eu_info.max_eus_per_subslice = sseu->max_eus_per_subslice;
> +
> + data_length = eu_info.max_slices * eu_info.max_subslices *
> + DIV_ROUND_UP(eu_info.max_eus_per_subslice, BITS_PER_BYTE);
> +
> + return copy_query_data(query_item,
> + &eu_info, sizeof(eu_info),
> + sseu->eu_mask, data_length);
> +}
> +
> static int (* const i915_query_funcs[])(struct drm_i915_private *dev_priv,
> struct drm_i915_query_item *query_item) = {
> + query_slice_info,
> + query_subslice_info,
> + query_eu_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 03f031652d86..7ae8e9aa0206 100644
> --- a/include/uapi/drm/i915_drm.h
> +++ b/include/uapi/drm/i915_drm.h
> @@ -1618,6 +1618,9 @@ struct drm_i915_perf_oa_config {
>
> struct drm_i915_query_item {
> __u64 query_id;
> +#define DRM_I915_QUERY_SLICE_INFO 0x01
> +#define DRM_I915_QUERY_SUBSLICE_INFO 0x02
> +#define DRM_I915_QUERY_EU_INFO 0x03
>
> /*
> * When set to zero by userspace, this is filled with the size of the
> @@ -1654,6 +1657,74 @@ struct drm_i915_query {
> __u64 items_ptr;
> };
>
> +#define DRM_I915_BIT(bit) ((__u32)1 << (bit))
> +#define DRM_I915_DIV_ROUND_UP(val, div) (((val) + (div) - 1) / (div))
> +
> +/*
> + * Data written by the kernel with query DRM_I915_QUERY_SLICE_INFO :
> + *
> + * data: each bit indicates whether a slice is available (1) or fused off (0).
> + * Formula to tell if slice X is available :
> + *
> + * (data[X / 8] >> (X % 8)) & 1
> + *
> + * Alternatively, use DRM_I915_QUERY_SLICE_AVAILABLE() to query a
> + * given subslice's availability.
> + */
> +struct drm_i915_query_slice_info {
> + __u32 max_slices;
> +
> +#define DRM_I915_QUERY_SLICE_AVAILABLE(info, slice) \
> + !!((info)->data[(slice) / 8] & DRM_I915_BIT((slice) % 8))
> + __u8 data[];
> +};
> +
> +/*
> + * Data written by the kernel with query DRM_I915_QUERY_SUBSLICE_INFO :
> + *
> + * data: each bit indicates whether a subslice is available (1) or fused off
> + * (0). Formula to tell if slice X subslice Y is available :
> + *
> + * (data[(X * ALIGN(max_subslices, 8) / 8) + Y / 8] >> (Y % 8)) & 1
> + *
> + * Alternatively, use DRM_I915_QUERY_SUBSLICE_AVAILABLE() to query a
> + * given subslice's availability.
> + */
> +struct drm_i915_query_subslice_info {
> + __u32 max_slices;
> + __u32 max_subslices;
> +
> +#define DRM_I915_QUERY_SUBSLICE_AVAILABLE(info, slice, subslice) \
> + !!((info)->data[(slice) * DRM_I915_DIV_ROUND_UP((info)->max_subslices, 8) + \
> + (subslice) / 8] & DRM_I915_BIT((subslice) % 8))
> + __u8 data[];
> +};
> +
> +/*
> + * Data written by the kernel with query DRM_I915_QUERY_EU_INFO :
> + *
> + * data: Each bit indicates whether an EU is available (1) or fused off (0).
> + * Formula to tell if slice X subslice Y eu Z is available :
> + *
> + * (data[X * max_subslices * ALIGN(max_eus_per_subslice, 8) / 8 +
> + * Y * ALIGN(max_eus_per_subslice, 8) / 8 +
> + * Z / 8] >> (Z % 8)) & 1
> + *
> + * Alternatively, use DRM_I915_QUERY_EU_AVAILABLE() to query a given
> + * EU's availability.
> + */
> +struct drm_i915_query_eu_info {
> + __u32 max_slices;
> + __u32 max_subslices;
> + __u32 max_eus_per_subslice;
> +
> +#define DRM_I915_QUERY_EU_AVAILABLE(info, slice, subslice, eu) \
> + !!((info)->data[(slice) * DRM_I915_DIV_ROUND_UP((info)->max_eus_per_subslice, 8) * (info)->max_subslices + \
> + (subslice) * DRM_I915_DIV_ROUND_UP((info)->max_eus_per_subslice, 8) + \
> + (eu) / 8] & DRM_I915_BIT((eu) % 8))
> + __u8 data[];
> +};
> +
> #if defined(__cplusplus)
> }
> #endif
>
Looks OK to me.
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
Regards,
Tvrtko
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