190 lines
7.1 KiB
C
190 lines
7.1 KiB
C
/**
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* struct __drm_i915_memory_region_info - Describes one region as known to the
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* driver.
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*
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* Note this is using both struct drm_i915_query_item and struct drm_i915_query.
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* For this new query we are adding the new query id DRM_I915_QUERY_MEMORY_REGIONS
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* at &drm_i915_query_item.query_id.
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*/
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struct __drm_i915_memory_region_info {
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/** @region: The class:instance pair encoding */
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struct drm_i915_gem_memory_class_instance region;
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/** @rsvd0: MBZ */
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__u32 rsvd0;
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/**
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* @probed_size: Memory probed by the driver
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*
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* Note that it should not be possible to ever encounter a zero value
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* here, also note that no current region type will ever return -1 here.
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* Although for future region types, this might be a possibility. The
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* same applies to the other size fields.
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*/
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__u64 probed_size;
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/**
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* @unallocated_size: Estimate of memory remaining
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*
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* Requires CAP_PERFMON or CAP_SYS_ADMIN to get reliable accounting.
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* Without this (or if this is an older kernel) the value here will
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* always equal the @probed_size. Note this is only currently tracked
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* for I915_MEMORY_CLASS_DEVICE regions (for other types the value here
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* will always equal the @probed_size).
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*/
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__u64 unallocated_size;
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union {
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/** @rsvd1: MBZ */
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__u64 rsvd1[8];
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struct {
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/**
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* @probed_cpu_visible_size: Memory probed by the driver
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* that is CPU accessible.
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*
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* This will be always be <= @probed_size, and the
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* remainder (if there is any) will not be CPU
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* accessible.
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*
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* On systems without small BAR, the @probed_size will
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* always equal the @probed_cpu_visible_size, since all
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* of it will be CPU accessible.
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*
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* Note this is only tracked for
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* I915_MEMORY_CLASS_DEVICE regions (for other types the
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* value here will always equal the @probed_size).
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*
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* Note that if the value returned here is zero, then
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* this must be an old kernel which lacks the relevant
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* small-bar uAPI support (including
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* I915_GEM_CREATE_EXT_FLAG_NEEDS_CPU_ACCESS), but on
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* such systems we should never actually end up with a
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* small BAR configuration, assuming we are able to load
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* the kernel module. Hence it should be safe to treat
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* this the same as when @probed_cpu_visible_size ==
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* @probed_size.
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*/
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__u64 probed_cpu_visible_size;
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/**
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* @unallocated_cpu_visible_size: Estimate of CPU
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* visible memory remaining
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*
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* Note this is only tracked for
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* I915_MEMORY_CLASS_DEVICE regions (for other types the
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* value here will always equal the
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* @probed_cpu_visible_size).
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*
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* Requires CAP_PERFMON or CAP_SYS_ADMIN to get reliable
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* accounting. Without this the value here will always
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* equal the @probed_cpu_visible_size. Note this is only
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* currently tracked for I915_MEMORY_CLASS_DEVICE
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* regions (for other types the value here will also
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* always equal the @probed_cpu_visible_size).
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*
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* If this is an older kernel the value here will be
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* zero, see also @probed_cpu_visible_size.
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*/
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__u64 unallocated_cpu_visible_size;
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};
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};
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};
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/**
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* struct __drm_i915_gem_create_ext - Existing gem_create behaviour, with added
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* extension support using struct i915_user_extension.
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*
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* Note that new buffer flags should be added here, at least for the stuff that
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* is immutable. Previously we would have two ioctls, one to create the object
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* with gem_create, and another to apply various parameters, however this
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* creates some ambiguity for the params which are considered immutable. Also in
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* general we're phasing out the various SET/GET ioctls.
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*/
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struct __drm_i915_gem_create_ext {
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/**
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* @size: Requested size for the object.
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*
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* The (page-aligned) allocated size for the object will be returned.
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*
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* Note that for some devices we have might have further minimum
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* page-size restrictions (larger than 4K), like for device local-memory.
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* However in general the final size here should always reflect any
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* rounding up, if for example using the I915_GEM_CREATE_EXT_MEMORY_REGIONS
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* extension to place the object in device local-memory. The kernel will
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* always select the largest minimum page-size for the set of possible
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* placements as the value to use when rounding up the @size.
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*/
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__u64 size;
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/**
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* @handle: Returned handle for the object.
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*
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* Object handles are nonzero.
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*/
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__u32 handle;
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/**
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* @flags: Optional flags.
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*
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* Supported values:
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*
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* I915_GEM_CREATE_EXT_FLAG_NEEDS_CPU_ACCESS - Signal to the kernel that
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* the object will need to be accessed via the CPU.
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*
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* Only valid when placing objects in I915_MEMORY_CLASS_DEVICE, and only
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* strictly required on configurations where some subset of the device
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* memory is directly visible/mappable through the CPU (which we also
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* call small BAR), like on some DG2+ systems. Note that this is quite
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* undesirable, but due to various factors like the client CPU, BIOS etc
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* it's something we can expect to see in the wild. See
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* &__drm_i915_memory_region_info.probed_cpu_visible_size for how to
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* determine if this system applies.
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*
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* Note that one of the placements MUST be I915_MEMORY_CLASS_SYSTEM, to
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* ensure the kernel can always spill the allocation to system memory,
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* if the object can't be allocated in the mappable part of
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* I915_MEMORY_CLASS_DEVICE.
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*
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* Also note that since the kernel only supports flat-CCS on objects
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* that can *only* be placed in I915_MEMORY_CLASS_DEVICE, we therefore
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* don't support I915_GEM_CREATE_EXT_FLAG_NEEDS_CPU_ACCESS together with
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* flat-CCS.
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*
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* Without this hint, the kernel will assume that non-mappable
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* I915_MEMORY_CLASS_DEVICE is preferred for this object. Note that the
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* kernel can still migrate the object to the mappable part, as a last
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* resort, if userspace ever CPU faults this object, but this might be
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* expensive, and so ideally should be avoided.
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*
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* On older kernels which lack the relevant small-bar uAPI support (see
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* also &__drm_i915_memory_region_info.probed_cpu_visible_size),
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* usage of the flag will result in an error, but it should NEVER be
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* possible to end up with a small BAR configuration, assuming we can
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* also successfully load the i915 kernel module. In such cases the
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* entire I915_MEMORY_CLASS_DEVICE region will be CPU accessible, and as
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* such there are zero restrictions on where the object can be placed.
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*/
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#define I915_GEM_CREATE_EXT_FLAG_NEEDS_CPU_ACCESS (1 << 0)
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__u32 flags;
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/**
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* @extensions: The chain of extensions to apply to this object.
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*
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* This will be useful in the future when we need to support several
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* different extensions, and we need to apply more than one when
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* creating the object. See struct i915_user_extension.
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*
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* If we don't supply any extensions then we get the same old gem_create
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* behaviour.
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*
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* For I915_GEM_CREATE_EXT_MEMORY_REGIONS usage see
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* struct drm_i915_gem_create_ext_memory_regions.
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*
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* For I915_GEM_CREATE_EXT_PROTECTED_CONTENT usage see
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* struct drm_i915_gem_create_ext_protected_content.
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*/
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#define I915_GEM_CREATE_EXT_MEMORY_REGIONS 0
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#define I915_GEM_CREATE_EXT_PROTECTED_CONTENT 1
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__u64 extensions;
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};
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