drm_i915_query_memory_regions Struct Reference

#include <i915_drm.h>

Collaboration diagram for drm_i915_query_memory_regions:

Public Attributes
__u32	num_regions
__u32	rsvd [3]
struct drm_i915_memory_region_info	regions []

Detailed Description

struct drm_i915_query_memory_regions

The region info query enumerates all regions known to the driver by filling in an array of struct drm_i915_memory_region_info structures.

Example for getting the list of supported regions:

.. code-block:: C

struct drm_i915_query_memory_regions *info; struct drm_i915_query_item item = { .query_id = DRM_I915_QUERY_MEMORY_REGIONS; }; struct drm_i915_query query = { .num_items = 1, .items_ptr = (uintptr_t)&item, }; int err, i;

// First query the size of the blob we need, this needs to be large // enough to hold our array of regions. The kernel will fill out the // item.length for us, which is the number of bytes we need. err = ioctl(fd, DRM_IOCTL_I915_QUERY, &query); if (err) ...

info = calloc(1, item.length); // Now that we allocated the required number of bytes, we call the ioctl // again, this time with the data_ptr pointing to our newly allocated // blob, which the kernel can then populate with the all the region info. item.data_ptr = (uintptr_t)&info,

err = ioctl(fd, DRM_IOCTL_I915_QUERY, &query); if (err) ...

// We can now access each region in the array for (i = 0; i < info->num_regions; i++) { struct drm_i915_memory_region_info mr = info->regions[i]; u16 class = mr.region.class; u16 instance = mr.region.instance;

.... }

free(info);

Member Data Documentation

num_regions

__u32 drm_i915_query_memory_regions::num_regions

@num_regions: Number of supported regions

regions

struct drm_i915_memory_region_info drm_i915_query_memory_regions::regions[]

@regions: Info about each supported region

rsvd

__u32 drm_i915_query_memory_regions::rsvd[3]

@rsvd: MBZ

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The documentation for this struct was generated from the following file:

• XenevaOS/BaseHdr/uapi/drm/i915_drm.h