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203 lines
10 KiB
C
203 lines
10 KiB
C
/*******************************************************************************
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Copyright (c) 2015 NVIDIA Corporation
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to
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deal in the Software without restriction, including without limitation the
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rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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sell copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be
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included in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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DEALINGS IN THE SOFTWARE.
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*******************************************************************************/
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#ifndef __UVM_RANGE_GROUP_H__
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#define __UVM_RANGE_GROUP_H__
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#include "nvtypes.h"
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#include "uvm_range_tree.h"
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#include "uvm_forward_decl.h"
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#include "uvm_lock.h"
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#include "uvm_va_block_types.h"
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typedef struct uvm_range_group_struct
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{
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// Group ID
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NvU64 id;
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// Does this group allow migration?
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// This is not protected by a lock, which is okay since it is valid
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// for a range group to be set as migratable while a migration of its
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// VA ranges to their preferred location has not been completed yet.
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// Using atomic_t rather than bool here to emphasize the fact that this
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// field is special
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atomic_t allow_migration;
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// range group ranges in this group
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struct list_head ranges;
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// Range group ranges in this group that have been migrated from their preferred location. This should always be
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// a subset of the ranges list. Any time this list is modified the migrated_ranges_lock should be acquired.
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struct list_head migrated_ranges;
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uvm_spinlock_t migrated_ranges_lock;
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} uvm_range_group_t;
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typedef struct uvm_range_group_range_struct
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{
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uvm_range_tree_node_t node;
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struct list_head range_group_list_node;
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struct list_head range_group_migrated_list_node;
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uvm_range_group_t *range_group;
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} uvm_range_group_range_t;
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// This structure can represent gaps in the tree too
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typedef struct uvm_range_group_range_iter_struct
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{
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NvU64 start;
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NvU64 end;
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// Whether this range is migratable.
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bool migratable;
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// Whether the iterator is pointing to a valid element.
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// Set to false when iteration moves past the last element.
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bool valid;
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// Whether start and end lie within node.
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bool is_current;
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// When valid and is_current are true, the node that corresponds to the position of the iterator
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// Also see uvm_range_group_range_iter_all_first()
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uvm_range_group_range_t *node;
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} uvm_range_group_range_iter_t;
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static inline bool uvm_range_group_migratable(uvm_range_group_t *range_group)
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{
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// A NULL range group is always migratable
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return !range_group || atomic_read(&range_group->allow_migration);
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}
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// Causes [start, end] to have a range group of range_group.
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// This function may split or overwrite existing range group ranges to accomplish this; merging when possible.
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// If range_group is NULL, this function will clear all range group ranges for the given range.
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// It is not necessary to clear a range before overwriting it with a new range_group association.
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NV_STATUS uvm_range_group_assign_range(uvm_va_space_t *va_space, uvm_range_group_t *range_group, NvU64 start, NvU64 end);
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// False when the address belongs to a range group range of a non-migratable range group.
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// True otherwise, even if the address is invalid.
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bool uvm_range_group_address_migratable(uvm_va_space_t *va_space, NvU64 address);
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// False if all addresses in the range belong to range group ranges of non-migratable range groups.
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// True otherwise, even if the range is invalid.
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bool uvm_range_group_any_migratable(uvm_va_space_t *va_space, NvU64 start, NvU64 end);
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// False if any address in the range belongs to a range group range of a non-migratable range group.
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// True otherwise, even if the range is invalid.
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bool uvm_range_group_all_migratable(uvm_va_space_t *va_space, NvU64 start, NvU64 end);
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// These iterators return range group ranges, skipping over addresses that have no associated range group.
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uvm_range_group_range_t *uvm_range_group_range_find(uvm_va_space_t *va_space, NvU64 addr);
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uvm_range_group_range_t *uvm_range_group_range_iter_first(uvm_va_space_t *va_space, NvU64 start, NvU64 end);
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uvm_range_group_range_t *uvm_range_group_range_iter_next(uvm_va_space_t *va_space,
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uvm_range_group_range_t *range,
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NvU64 end);
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// These iterators return range group ranges one at a time, but also yield gaps in between range group ranges.
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// When iter refers to a range_group_range, iter->is_current will be true and iter->node will be the range group range.
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// When iter refers to a gap, iter->is_current will be false.
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// This function will always return a valid iterator, as long as start <= end, which is required.
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// iter->valid is set when iter refers to a range within the caller-specified range. It is cleared to indicate the end of iteration.
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// It does not reflect the validity of those virtual addresses in the va_space.
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// iter_all_first and iter_all_next clamp iter->start and iter->end to the start and end values passed by the caller.
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void uvm_range_group_range_iter_all_first(uvm_va_space_t *va_space,
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NvU64 start,
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NvU64 end,
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uvm_range_group_range_iter_t *iter);
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// Advance an iterator that yields range group ranges as well as any gaps in between them.
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// Returns iter->valid.
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bool uvm_range_group_range_iter_all_next(uvm_va_space_t *va_space,
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uvm_range_group_range_iter_t *iter,
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NvU64 end);
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// These iterators return the largest possible range of addresses that are either all migratable or not.
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// To determine which is the case, check iter->migratable.
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// This function will always return a valid iterator, as long as start <= end, which is required.
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// migratability_iter_first and migratability_iter_next clamp iter->start and iter->end
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// to the start and end values passed by the caller.
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void uvm_range_group_range_migratability_iter_first(uvm_va_space_t *va_space,
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NvU64 start,
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NvU64 end,
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uvm_range_group_range_iter_t *iter);
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// Advance a migratability iterator. Check iter->valid to determine whether iter refers to a valid region.
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void uvm_range_group_range_migratability_iter_next(uvm_va_space_t *va_space,
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uvm_range_group_range_iter_t *iter,
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NvU64 end);
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// This iterator is like uvm_range_group_range_migratability_iter_next except that it allows the caller to
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// modify the range group range tree during iteration, and is slightly less efficient.
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static void uvm_range_group_range_migratability_iter_next_safe(uvm_va_space_t *va_space,
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uvm_range_group_range_iter_t *iter,
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NvU64 end)
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{
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iter->valid = iter->end < end;
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if (!iter->valid)
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return;
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uvm_range_group_range_migratability_iter_first(va_space, iter->end + 1, end, iter);
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}
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// Fill mask_out with all migratable pages in region. The mask is guaranteed to
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// be zero outside the region.
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void uvm_range_group_migratable_page_mask(uvm_va_block_t *va_block,
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uvm_va_block_region_t region,
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uvm_page_mask_t *mask_out);
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NV_STATUS uvm_range_group_init(void);
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void uvm_range_group_exit(void);
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void uvm_range_group_radix_tree_destroy(uvm_va_space_t *va_space);
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// Move a non-migratable VA range to its preferred location and add
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// mappings for processors in the accessed by mask and for the preferred
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// location (with the exception of CPU which never gets any mapping).
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//
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// This does not wait for the migration to complete. The work is added to the
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// output tracker.
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NV_STATUS uvm_range_group_va_range_migrate(uvm_va_range_t *va_range,
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NvU64 start,
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NvU64 end,
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uvm_tracker_t *out_tracker);
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#define uvm_range_group_for_each_range_in(node, va_space, start, end) \
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for ((node) = uvm_range_group_range_iter_first((va_space), (start), (end)); \
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(node); \
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(node) = uvm_range_group_range_iter_next((va_space), (node), (end)))
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#define uvm_range_group_for_all_ranges_in(iter, va_space, start, end) \
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for (uvm_range_group_range_iter_all_first((va_space), (start), (end), (iter)); \
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(iter)->valid; \
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uvm_range_group_range_iter_all_next((va_space), (iter), (end)))
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#define uvm_range_group_for_each_migratability_in(iter, va_space, start, end) \
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for (uvm_range_group_range_migratability_iter_first((va_space), (start), (end), (iter)); \
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(iter)->valid; \
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uvm_range_group_range_migratability_iter_next((va_space), (iter), (end)))
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#define uvm_range_group_for_each_migratability_in_safe(iter, va_space, start, end) \
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for (uvm_range_group_range_migratability_iter_first((va_space), (start), (end), (iter)); \
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(iter)->valid; \
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uvm_range_group_range_migratability_iter_next_safe((va_space), (iter), (end)))
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#endif // __UVM_RANGE_GROUP_H__
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