1 /* 2 * SPDX-License-Identifier: MIT 3 * 4 * Copyright © 2018 Intel Corporation 5 */ 6 7 #include "i915_drv.h" 8 #include "i915_query.h" 9 #include <uapi/drm/i915_drm.h> 10 11 static int query_topology_info(struct drm_i915_private *dev_priv, 12 struct drm_i915_query_item *query_item) 13 { 14 const struct sseu_dev_info *sseu = &INTEL_INFO(dev_priv)->sseu; 15 struct drm_i915_query_topology_info topo; 16 u32 slice_length, subslice_length, eu_length, total_length; 17 18 if (query_item->flags != 0) 19 return -EINVAL; 20 21 if (sseu->max_slices == 0) 22 return -ENODEV; 23 24 BUILD_BUG_ON(sizeof(u8) != sizeof(sseu->slice_mask)); 25 26 slice_length = sizeof(sseu->slice_mask); 27 subslice_length = sseu->max_slices * 28 DIV_ROUND_UP(sseu->max_subslices, 29 sizeof(sseu->subslice_mask[0]) * BITS_PER_BYTE); 30 eu_length = sseu->max_slices * sseu->max_subslices * 31 DIV_ROUND_UP(sseu->max_eus_per_subslice, BITS_PER_BYTE); 32 33 total_length = sizeof(topo) + slice_length + subslice_length + eu_length; 34 35 if (query_item->length == 0) 36 return total_length; 37 38 if (query_item->length < total_length) 39 return -EINVAL; 40 41 if (copy_from_user(&topo, u64_to_user_ptr(query_item->data_ptr), 42 sizeof(topo))) 43 return -EFAULT; 44 45 if (topo.flags != 0) 46 return -EINVAL; 47 48 if (!access_ok(VERIFY_WRITE, u64_to_user_ptr(query_item->data_ptr), 49 total_length)) 50 return -EFAULT; 51 52 memset(&topo, 0, sizeof(topo)); 53 topo.max_slices = sseu->max_slices; 54 topo.max_subslices = sseu->max_subslices; 55 topo.max_eus_per_subslice = sseu->max_eus_per_subslice; 56 57 topo.subslice_offset = slice_length; 58 topo.subslice_stride = DIV_ROUND_UP(sseu->max_subslices, BITS_PER_BYTE); 59 topo.eu_offset = slice_length + subslice_length; 60 topo.eu_stride = 61 DIV_ROUND_UP(sseu->max_eus_per_subslice, BITS_PER_BYTE); 62 63 if (__copy_to_user(u64_to_user_ptr(query_item->data_ptr), 64 &topo, sizeof(topo))) 65 return -EFAULT; 66 67 if (__copy_to_user(u64_to_user_ptr(query_item->data_ptr + sizeof(topo)), 68 &sseu->slice_mask, slice_length)) 69 return -EFAULT; 70 71 if (__copy_to_user(u64_to_user_ptr(query_item->data_ptr + 72 sizeof(topo) + slice_length), 73 sseu->subslice_mask, subslice_length)) 74 return -EFAULT; 75 76 if (__copy_to_user(u64_to_user_ptr(query_item->data_ptr + 77 sizeof(topo) + 78 slice_length + subslice_length), 79 sseu->eu_mask, eu_length)) 80 return -EFAULT; 81 82 return total_length; 83 } 84 85 static int (* const i915_query_funcs[])(struct drm_i915_private *dev_priv, 86 struct drm_i915_query_item *query_item) = { 87 query_topology_info, 88 }; 89 90 int i915_query_ioctl(struct drm_device *dev, void *data, struct drm_file *file) 91 { 92 struct drm_i915_private *dev_priv = to_i915(dev); 93 struct drm_i915_query *args = data; 94 struct drm_i915_query_item __user *user_item_ptr = 95 u64_to_user_ptr(args->items_ptr); 96 u32 i; 97 98 if (args->flags != 0) 99 return -EINVAL; 100 101 for (i = 0; i < args->num_items; i++, user_item_ptr++) { 102 struct drm_i915_query_item item; 103 u64 func_idx; 104 int ret; 105 106 if (copy_from_user(&item, user_item_ptr, sizeof(item))) 107 return -EFAULT; 108 109 if (item.query_id == 0) 110 return -EINVAL; 111 112 func_idx = item.query_id - 1; 113 114 if (func_idx < ARRAY_SIZE(i915_query_funcs)) 115 ret = i915_query_funcs[func_idx](dev_priv, &item); 116 else 117 ret = -EINVAL; 118 119 /* Only write the length back to userspace if they differ. */ 120 if (ret != item.length && put_user(ret, &user_item_ptr->length)) 121 return -EFAULT; 122 } 123 124 return 0; 125 } 126