1 /** 2 * struct __drm_i915_memory_region_info - Describes one region as known to the 3 * driver. 4 * 5 * Note this is using both struct drm_i915_query_item and struct drm_i915_query. 6 * For this new query we are adding the new query id DRM_I915_QUERY_MEMORY_REGIONS 7 * at &drm_i915_query_item.query_id. 8 */ 9 struct __drm_i915_memory_region_info { 10 /** @region: The class:instance pair encoding */ 11 struct drm_i915_gem_memory_class_instance region; 12 13 /** @rsvd0: MBZ */ 14 __u32 rsvd0; 15 16 /** 17 * @probed_size: Memory probed by the driver 18 * 19 * Note that it should not be possible to ever encounter a zero value 20 * here, also note that no current region type will ever return -1 here. 21 * Although for future region types, this might be a possibility. The 22 * same applies to the other size fields. 23 */ 24 __u64 probed_size; 25 26 /** 27 * @unallocated_size: Estimate of memory remaining 28 * 29 * Requires CAP_PERFMON or CAP_SYS_ADMIN to get reliable accounting. 30 * Without this (or if this is an older kernel) the value here will 31 * always equal the @probed_size. Note this is only currently tracked 32 * for I915_MEMORY_CLASS_DEVICE regions (for other types the value here 33 * will always equal the @probed_size). 34 */ 35 __u64 unallocated_size; 36 37 union { 38 /** @rsvd1: MBZ */ 39 __u64 rsvd1[8]; 40 struct { 41 /** 42 * @probed_cpu_visible_size: Memory probed by the driver 43 * that is CPU accessible. 44 * 45 * This will be always be <= @probed_size, and the 46 * remainder (if there is any) will not be CPU 47 * accessible. 48 * 49 * On systems without small BAR, the @probed_size will 50 * always equal the @probed_cpu_visible_size, since all 51 * of it will be CPU accessible. 52 * 53 * Note this is only tracked for 54 * I915_MEMORY_CLASS_DEVICE regions (for other types the 55 * value here will always equal the @probed_size). 56 * 57 * Note that if the value returned here is zero, then 58 * this must be an old kernel which lacks the relevant 59 * small-bar uAPI support (including 60 * I915_GEM_CREATE_EXT_FLAG_NEEDS_CPU_ACCESS), but on 61 * such systems we should never actually end up with a 62 * small BAR configuration, assuming we are able to load 63 * the kernel module. Hence it should be safe to treat 64 * this the same as when @probed_cpu_visible_size == 65 * @probed_size. 66 */ 67 __u64 probed_cpu_visible_size; 68 69 /** 70 * @unallocated_cpu_visible_size: Estimate of CPU 71 * visible memory remaining 72 * 73 * Note this is only tracked for 74 * I915_MEMORY_CLASS_DEVICE regions (for other types the 75 * value here will always equal the 76 * @probed_cpu_visible_size). 77 * 78 * Requires CAP_PERFMON or CAP_SYS_ADMIN to get reliable 79 * accounting. Without this the value here will always 80 * equal the @probed_cpu_visible_size. Note this is only 81 * currently tracked for I915_MEMORY_CLASS_DEVICE 82 * regions (for other types the value here will also 83 * always equal the @probed_cpu_visible_size). 84 * 85 * If this is an older kernel the value here will be 86 * zero, see also @probed_cpu_visible_size. 87 */ 88 __u64 unallocated_cpu_visible_size; 89 }; 90 }; 91 }; 92 93 /** 94 * struct __drm_i915_gem_create_ext - Existing gem_create behaviour, with added 95 * extension support using struct i915_user_extension. 96 * 97 * Note that new buffer flags should be added here, at least for the stuff that 98 * is immutable. Previously we would have two ioctls, one to create the object 99 * with gem_create, and another to apply various parameters, however this 100 * creates some ambiguity for the params which are considered immutable. Also in 101 * general we're phasing out the various SET/GET ioctls. 102 */ 103 struct __drm_i915_gem_create_ext { 104 /** 105 * @size: Requested size for the object. 106 * 107 * The (page-aligned) allocated size for the object will be returned. 108 * 109 * Note that for some devices we have might have further minimum 110 * page-size restrictions (larger than 4K), like for device local-memory. 111 * However in general the final size here should always reflect any 112 * rounding up, if for example using the I915_GEM_CREATE_EXT_MEMORY_REGIONS 113 * extension to place the object in device local-memory. The kernel will 114 * always select the largest minimum page-size for the set of possible 115 * placements as the value to use when rounding up the @size. 116 */ 117 __u64 size; 118 119 /** 120 * @handle: Returned handle for the object. 121 * 122 * Object handles are nonzero. 123 */ 124 __u32 handle; 125 126 /** 127 * @flags: Optional flags. 128 * 129 * Supported values: 130 * 131 * I915_GEM_CREATE_EXT_FLAG_NEEDS_CPU_ACCESS - Signal to the kernel that 132 * the object will need to be accessed via the CPU. 133 * 134 * Only valid when placing objects in I915_MEMORY_CLASS_DEVICE, and only 135 * strictly required on configurations where some subset of the device 136 * memory is directly visible/mappable through the CPU (which we also 137 * call small BAR), like on some DG2+ systems. Note that this is quite 138 * undesirable, but due to various factors like the client CPU, BIOS etc 139 * it's something we can expect to see in the wild. See 140 * &__drm_i915_memory_region_info.probed_cpu_visible_size for how to 141 * determine if this system applies. 142 * 143 * Note that one of the placements MUST be I915_MEMORY_CLASS_SYSTEM, to 144 * ensure the kernel can always spill the allocation to system memory, 145 * if the object can't be allocated in the mappable part of 146 * I915_MEMORY_CLASS_DEVICE. 147 * 148 * Also note that since the kernel only supports flat-CCS on objects 149 * that can *only* be placed in I915_MEMORY_CLASS_DEVICE, we therefore 150 * don't support I915_GEM_CREATE_EXT_FLAG_NEEDS_CPU_ACCESS together with 151 * flat-CCS. 152 * 153 * Without this hint, the kernel will assume that non-mappable 154 * I915_MEMORY_CLASS_DEVICE is preferred for this object. Note that the 155 * kernel can still migrate the object to the mappable part, as a last 156 * resort, if userspace ever CPU faults this object, but this might be 157 * expensive, and so ideally should be avoided. 158 * 159 * On older kernels which lack the relevant small-bar uAPI support (see 160 * also &__drm_i915_memory_region_info.probed_cpu_visible_size), 161 * usage of the flag will result in an error, but it should NEVER be 162 * possible to end up with a small BAR configuration, assuming we can 163 * also successfully load the i915 kernel module. In such cases the 164 * entire I915_MEMORY_CLASS_DEVICE region will be CPU accessible, and as 165 * such there are zero restrictions on where the object can be placed. 166 */ 167 #define I915_GEM_CREATE_EXT_FLAG_NEEDS_CPU_ACCESS (1 << 0) 168 __u32 flags; 169 170 /** 171 * @extensions: The chain of extensions to apply to this object. 172 * 173 * This will be useful in the future when we need to support several 174 * different extensions, and we need to apply more than one when 175 * creating the object. See struct i915_user_extension. 176 * 177 * If we don't supply any extensions then we get the same old gem_create 178 * behaviour. 179 * 180 * For I915_GEM_CREATE_EXT_MEMORY_REGIONS usage see 181 * struct drm_i915_gem_create_ext_memory_regions. 182 * 183 * For I915_GEM_CREATE_EXT_PROTECTED_CONTENT usage see 184 * struct drm_i915_gem_create_ext_protected_content. 185 */ 186 #define I915_GEM_CREATE_EXT_MEMORY_REGIONS 0 187 #define I915_GEM_CREATE_EXT_PROTECTED_CONTENT 1 188 __u64 extensions; 189 }; 190