Messages in this thread | | | Date | Mon, 6 Feb 2023 14:46:00 +0100 | Subject | Re: [PATCH drm-next 03/14] drm: manager to keep track of GPUs VA mappings | From | Danilo Krummrich <> |
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On 2/6/23 14:35, Christian König wrote: > Am 03.02.23 um 18:37 schrieb Matthew Brost: >> On Wed, Jan 18, 2023 at 07:12:45AM +0100, Danilo Krummrich wrote: >>> This adds the infrastructure for a manager implementation to keep track >>> of GPU virtual address (VA) mappings. >>> >>> New UAPIs, motivated by Vulkan sparse memory bindings graphics drivers >>> start implementing, allow userspace applications to request multiple and >>> arbitrary GPU VA mappings of buffer objects. The DRM GPU VA manager is >>> intended to serve the following purposes in this context. >>> >>> 1) Provide a dedicated range allocator to track GPU VA allocations and >>> mappings, making use of the drm_mm range allocator. >>> >>> 2) Generically connect GPU VA mappings to their backing buffers, in >>> particular DRM GEM objects. >>> >>> 3) Provide a common implementation to perform more complex mapping >>> operations on the GPU VA space. In particular splitting and merging >>> of GPU VA mappings, e.g. for intersecting mapping requests or >>> partial >>> unmap requests. >>> >> Over the past week I've hacked together a PoC port of Xe to GPUVA [1], so >> far it seems really promising. 95% of the way to being feature >> equivalent of the current Xe VM bind implementation and have line of >> sight to getting sparse bindings implemented on top of GPUVA too. IMO >> this has basically everything we need for Xe with a few tweaks. >> >> I am out until 2/14 but wanted to get my thoughts / suggestions out on >> the list before I leave. >> >> 1. GPUVA post didn't support the way Xe does userptrs - a NULL GEM. I >> believe with [2], [3], and [4] GPUVA will support NULL GEMs. Also my >> thinking sparse binds will also have NULL GEMs, more on sparse bindings >> below. >> >> 2. I agree with Christian that drm_mm probably isn't what we want to >> base the GPUVA implementation on, rather a RB tree or Maple tree has >> been discussed. The implementation should be fairly easy to tune once we >> have benchmarks running so not to concerned here as we can figure this >> out down the line. >> >> 3. In Xe we want create xe_vm_op list which inherits from drm_gpuva_op >> I've done this with a hack [5], I believe when we rebase we can do this >> with a custom callback to allocate a large op size. >> >> 4. I'd like add user bits to drm_gpuva_flags like I do in [6]. This is >> similar to DMA_FENCE_FLAG_USER_BITS. >> >> 5. In Xe we have VM prefetch operation which is needed for our compute >> UMD with page faults. I'd like add prefetch type of operation like we do >> in [7]. >> >> 6. In Xe we have VM unbind all mappings for a GEM IOCTL, I'd like to add >> support to generate this operation list to GPUVA like we do in [8]. >> >> 7. I've thought about how Xe will implement sparse mappings (read 0, >> writes dropped). My current thinking is a sparse mapping will be >> represented as a drm_gpuva rather than region like in Nouveau. Making >> regions optional to me seems likes good idea rather than forcing the >> user of GPUVA code to create 1 large region for the manager as I >> currently do in the Xe PoC. > > From Danilo's explanation I'm now pretty sure that regions won't work > for Nouveau either. > > He seems to use an incorrect assumption about applications not changing > the sparse mappings behind a VkBuffer while the GPU is using it. > > As far as I can see games like Forza won't work with this approach. >
I appreciate sharing your concerns since they're seriously helping me to improve things and consider things I missed before. However, I'd prefer to wait for clarification before distributing them to other sub-threads. Depending on whether the understanding of where those concerns arise from turns out to be right or wrong, this might cause confusion for people not following *all* sub-threads.
>> >> 8. Personally I'd like the caller to own the locking for GEM drm_gpuva >> list (drm_gpuva_link_*, drm_gpuva_unlink_* functions). In Xe we almost >> certainly will have the GEM dma-resv lock when we touch this list so an >> extra lock here is redundant. Also it kinda goofy that caller owns the >> for drm_gpuva insertion / removal but not the locking for this list. >> >> WRT to Christian thoughts on a common uAPI rules for VM binds, I kinda >> like that idea but I don't think that is necessary. All of pur uAPI >> should be close but also the GPUVA implementation should be flexible >> enough to fit all of our needs and I think for the most part it is. > > Maybe I should refine my concerns: A common component for GPUVM mappings > is a good idea, but we should not expect that to define any driver > independent UAPI. > > If we want to define driver independent UAPI we should do so explicitly. > > Christian. > >> >> Let me know what everything thinks about this. It would be great if when >> I'm back on 2/14 I can rebase the Xe port to GPUVA on another version of >> the GPUVA code and get sparse binding support implementation. Also I'd >> like to get GPUVA merged in the Xe repo ASAP as our VM bind code badly >> needed to be cleaned and this was the push we needed to make this >> happen. >> >> Matt >> >> [1] https://gitlab.freedesktop.org/drm/xe/kernel/-/merge_requests/314 >> [2] >> https://gitlab.freedesktop.org/drm/xe/kernel/-/merge_requests/314/diffs?commit_id=2ae21d7a3f52e5eb2c105ed8ae231471274bdc36 >> [3] >> https://gitlab.freedesktop.org/drm/xe/kernel/-/merge_requests/314/diffs?commit_id=49fca9f5d96201f5cbd1b19c7ff17eedfac65cdc >> [4] >> https://gitlab.freedesktop.org/drm/xe/kernel/-/merge_requests/314/diffs?commit_id=61fa6b1e1f10e791ae82358fa971b04421d53024 >> [5] >> https://gitlab.freedesktop.org/drm/xe/kernel/-/merge_requests/314/diffs?commit_id=87fc08dcf0840e794b38269fe4c6a95d088d79ec >> [6] >> https://gitlab.freedesktop.org/drm/xe/kernel/-/merge_requests/314/diffs?commit_id=a4826c22f6788bc29906ffa263c1cd3c4661fa77 >> [7] >> https://gitlab.freedesktop.org/drm/xe/kernel/-/merge_requests/314/diffs?commit_id=f008bbb55b213868e52c7b9cda4c1bfb95af6aee >> [8] >> https://gitlab.freedesktop.org/drm/xe/kernel/-/merge_requests/314/diffs?commit_id=41f4f71c05d04d2b17d988dd95369b5df2d7f681 >> >>> Idea-suggested-by: Dave Airlie <airlied@redhat.com> >>> Signed-off-by: Danilo Krummrich <dakr@redhat.com> >>> --- >>> Documentation/gpu/drm-mm.rst | 31 + >>> drivers/gpu/drm/Makefile | 1 + >>> drivers/gpu/drm/drm_gem.c | 3 + >>> drivers/gpu/drm/drm_gpuva_mgr.c | 1323 +++++++++++++++++++++++++++++++ >>> include/drm/drm_drv.h | 6 + >>> include/drm/drm_gem.h | 75 ++ >>> include/drm/drm_gpuva_mgr.h | 527 ++++++++++++ >>> 7 files changed, 1966 insertions(+) >>> create mode 100644 drivers/gpu/drm/drm_gpuva_mgr.c >>> create mode 100644 include/drm/drm_gpuva_mgr.h >>> >>> diff --git a/Documentation/gpu/drm-mm.rst b/Documentation/gpu/drm-mm.rst >>> index a52e6f4117d6..c9f120cfe730 100644 >>> --- a/Documentation/gpu/drm-mm.rst >>> +++ b/Documentation/gpu/drm-mm.rst >>> @@ -466,6 +466,37 @@ DRM MM Range Allocator Function References >>> .. kernel-doc:: drivers/gpu/drm/drm_mm.c >>> :export: >>> +DRM GPU VA Manager >>> +================== >>> + >>> +Overview >>> +-------- >>> + >>> +.. kernel-doc:: drivers/gpu/drm/drm_gpuva_mgr.c >>> + :doc: Overview >>> + >>> +Split and Merge >>> +--------------- >>> + >>> +.. kernel-doc:: drivers/gpu/drm/drm_gpuva_mgr.c >>> + :doc: Split and Merge >>> + >>> +Locking >>> +------- >>> + >>> +.. kernel-doc:: drivers/gpu/drm/drm_gpuva_mgr.c >>> + :doc: Locking >>> + >>> + >>> +DRM GPU VA Manager Function References >>> +-------------------------------------- >>> + >>> +.. kernel-doc:: include/drm/drm_gpuva_mgr.h >>> + :internal: >>> + >>> +.. kernel-doc:: drivers/gpu/drm/drm_gpuva_mgr.c >>> + :export: >>> + >>> DRM Buddy Allocator >>> =================== >>> diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile >>> index 4fe190aee584..de2ffca3b6e4 100644 >>> --- a/drivers/gpu/drm/Makefile >>> +++ b/drivers/gpu/drm/Makefile >>> @@ -45,6 +45,7 @@ drm-y := \ >>> drm_vblank.o \ >>> drm_vblank_work.o \ >>> drm_vma_manager.o \ >>> + drm_gpuva_mgr.o \ >>> drm_writeback.o >>> drm-$(CONFIG_DRM_LEGACY) += \ >>> drm_agpsupport.o \ >>> diff --git a/drivers/gpu/drm/drm_gem.c b/drivers/gpu/drm/drm_gem.c >>> index 59a0bb5ebd85..65115fe88627 100644 >>> --- a/drivers/gpu/drm/drm_gem.c >>> +++ b/drivers/gpu/drm/drm_gem.c >>> @@ -164,6 +164,9 @@ void drm_gem_private_object_init(struct >>> drm_device *dev, >>> if (!obj->resv) >>> obj->resv = &obj->_resv; >>> + if (drm_core_check_feature(dev, DRIVER_GEM_GPUVA)) >>> + drm_gem_gpuva_init(obj); >>> + >>> drm_vma_node_reset(&obj->vma_node); >>> INIT_LIST_HEAD(&obj->lru_node); >>> } >>> diff --git a/drivers/gpu/drm/drm_gpuva_mgr.c >>> b/drivers/gpu/drm/drm_gpuva_mgr.c >>> new file mode 100644 >>> index 000000000000..e665f642689d >>> --- /dev/null >>> +++ b/drivers/gpu/drm/drm_gpuva_mgr.c >>> @@ -0,0 +1,1323 @@ >>> +// SPDX-License-Identifier: GPL-2.0 >>> +/* >>> + * Copyright (c) 2022 Red Hat. >>> + * >>> + * Permission is hereby granted, free of charge, to any person >>> obtaining a >>> + * copy of this software and associated documentation files (the >>> "Software"), >>> + * to deal in the Software without restriction, including without >>> limitation >>> + * the rights to use, copy, modify, merge, publish, distribute, >>> sublicense, >>> + * and/or sell copies of the Software, and to permit persons to whom >>> the >>> + * Software is furnished to do so, subject to the following conditions: >>> + * >>> + * The above copyright notice and this permission notice shall be >>> included in >>> + * all copies or substantial portions of the Software. >>> + * >>> + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, >>> EXPRESS OR >>> + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF >>> MERCHANTABILITY, >>> + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO >>> EVENT SHALL >>> + * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, >>> DAMAGES OR >>> + * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR >>> OTHERWISE, >>> + * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE >>> USE OR >>> + * OTHER DEALINGS IN THE SOFTWARE. >>> + * >>> + * Authors: >>> + * Danilo Krummrich <dakr@redhat.com> >>> + * >>> + */ >>> + >>> +#include <drm/drm_gem.h> >>> +#include <drm/drm_gpuva_mgr.h> >>> + >>> +/** >>> + * DOC: Overview >>> + * >>> + * The DRM GPU VA Manager, represented by struct drm_gpuva_manager >>> keeps track >>> + * of a GPU's virtual address (VA) space and manages the >>> corresponding virtual >>> + * mappings represented by &drm_gpuva objects. It also keeps track >>> of the >>> + * mapping's backing &drm_gem_object buffers. >>> + * >>> + * &drm_gem_object buffers maintain a list (and a corresponding list >>> lock) of >>> + * &drm_gpuva objects representing all existent GPU VA mappings >>> using this >>> + * &drm_gem_object as backing buffer. >>> + * >>> + * A GPU VA mapping can only be created within a previously allocated >>> + * &drm_gpuva_region, which represents a reserved portion of the GPU >>> VA space. >>> + * GPU VA mappings are not allowed to span over a >>> &drm_gpuva_region's boundary. >>> + * >>> + * GPU VA regions can also be flagged as sparse, which allows >>> drivers to create >>> + * sparse mappings for a whole GPU VA region in order to support Vulkan >>> + * 'Sparse Resources'. >>> + * >>> + * The GPU VA manager internally uses the &drm_mm range allocator to >>> manage the >>> + * &drm_gpuva mappings and the &drm_gpuva_regions within a GPU's >>> virtual address >>> + * space. >>> + * >>> + * Besides the GPU VA space regions (&drm_gpuva_region) allocated by >>> a driver >>> + * the &drm_gpuva_manager contains a special region representing the >>> portion of >>> + * VA space reserved by the kernel. This node is initialized >>> together with the >>> + * GPU VA manager instance and removed when the GPU VA manager is >>> destroyed. >>> + * >>> + * In a typical application drivers would embed struct >>> drm_gpuva_manager, >>> + * struct drm_gpuva_region and struct drm_gpuva within their own driver >>> + * specific structures, there won't be any memory allocations of >>> it's own nor >>> + * memory allocations of &drm_gpuva or &drm_gpuva_region entries. >>> + */ >>> + >>> +/** >>> + * DOC: Split and Merge >>> + * >>> + * The DRM GPU VA manager also provides an algorithm implementing >>> splitting and >>> + * merging of existent GPU VA mappings with the ones that are >>> requested to be >>> + * mapped or unmapped. This feature is required by the Vulkan API to >>> implement >>> + * Vulkan 'Sparse Memory Bindings' - drivers UAPIs often refer to >>> this as >>> + * VM BIND. >>> + * >>> + * Drivers can call drm_gpuva_sm_map_ops_create() to obtain a list >>> of map, unmap >>> + * and remap operations for a given newly requested mapping. This list >>> + * represents the set of operations to execute in order to integrate >>> the new >>> + * mapping cleanly into the current state of the GPU VA space. >>> + * >>> + * Depending on how the new GPU VA mapping intersects with the >>> existent mappings >>> + * of the GPU VA space the &drm_gpuva_ops contain an arbitrary >>> amount of unmap >>> + * operations, a maximum of two remap operations and a single map >>> operation. >>> + * The set of operations can also be empty if no operation is >>> required, e.g. if >>> + * the requested mapping already exists in the exact same way. >>> + * >>> + * The single map operation, if existent, represents the original >>> map operation >>> + * requested by the caller. Please note that this operation might be >>> altered >>> + * comparing it with the original map operation, e.g. because it was >>> merged with >>> + * an already existent mapping. Hence, drivers must execute this >>> map operation >>> + * instead of the original one they passed to >>> drm_gpuva_sm_map_ops_create(). >>> + * >>> + * &drm_gpuva_op_unmap contains a 'keep' field, which indicates >>> whether the >>> + * &drm_gpuva to unmap is physically contiguous with the original >>> mapping >>> + * request. Optionally, if 'keep' is set, drivers may keep the >>> actual page table >>> + * entries for this &drm_gpuva, adding the missing page table >>> entries only and >>> + * update the &drm_gpuva_manager's view of things accordingly. >>> + * >>> + * Drivers may do the same optimization, namely delta page table >>> updates, also >>> + * for remap operations. This is possible since &drm_gpuva_op_remap >>> consists of >>> + * one unmap operation and one or two map operations, such that >>> drivers can >>> + * derive the page table update delta accordingly. >>> + * >>> + * Note that there can't be more than two existent mappings to split >>> up, one at >>> + * the beginning and one at the end of the new mapping, hence there >>> is a >>> + * maximum of two remap operations. >>> + * >>> + * Generally, the DRM GPU VA manager never merges mappings across the >>> + * boundaries of &drm_gpuva_regions. This is the case since merging >>> between >>> + * GPU VA regions would result into unmap and map operations to be >>> issued for >>> + * both regions involved although the original mapping request was >>> referred to >>> + * one specific GPU VA region only. Since the other GPU VA region, >>> the one not >>> + * explicitly requested to be altered, might be in use by the GPU, >>> we are not >>> + * allowed to issue any map/unmap operations for this region. >>> + * >>> + * Note that before calling drm_gpuva_sm_map_ops_create() again with >>> another >>> + * mapping request it is necessary to update the >>> &drm_gpuva_manager's view of >>> + * the GPU VA space. The previously obtained operations must be >>> either fully >>> + * processed or completely abandoned. >>> + * >>> + * To update the &drm_gpuva_manager's view of the GPU VA space >>> + * drm_gpuva_insert(), drm_gpuva_destroy_locked() and/or >>> + * drm_gpuva_destroy_unlocked() should be used. >>> + * >>> + * Analogue to drm_gpuva_sm_map_ops_create() >>> drm_gpuva_sm_unmap_ops_create() >>> + * provides drivers a the list of operations to be executed in order >>> to unmap >>> + * a range of GPU VA space. The logic behind this functions is way >>> simpler >>> + * though: For all existent mappings enclosed by the given range unmap >>> + * operations are created. For mappings which are only partically >>> located within >>> + * the given range, remap operations are created such that those >>> mappings are >>> + * split up and re-mapped partically. >>> + * >>> + * The following paragraph depicts the basic constellations of >>> existent GPU VA >>> + * mappings, a newly requested mapping and the resulting mappings as >>> implemented >>> + * by drm_gpuva_sm_map_ops_create() - it doesn't cover arbitrary >>> combinations >>> + * of those constellations. >>> + * >>> + * :: >>> + * >>> + * 1) Existent mapping is kept. >>> + * ---------------------------- >>> + * >>> + * 0 a 1 >>> + * old: |-----------| (bo_offset=n) >>> + * >>> + * 0 a 1 >>> + * req: |-----------| (bo_offset=n) >>> + * >>> + * 0 a 1 >>> + * new: |-----------| (bo_offset=n) >>> + * >>> + * >>> + * 2) Existent mapping is replaced. >>> + * -------------------------------- >>> + * >>> + * 0 a 1 >>> + * old: |-----------| (bo_offset=n) >>> + * >>> + * 0 a 1 >>> + * req: |-----------| (bo_offset=m) >>> + * >>> + * 0 a 1 >>> + * new: |-----------| (bo_offset=m) >>> + * >>> + * >>> + * 3) Existent mapping is replaced. >>> + * -------------------------------- >>> + * >>> + * 0 a 1 >>> + * old: |-----------| (bo_offset=n) >>> + * >>> + * 0 b 1 >>> + * req: |-----------| (bo_offset=n) >>> + * >>> + * 0 b 1 >>> + * new: |-----------| (bo_offset=n) >>> + * >>> + * >>> + * 4) Existent mapping is replaced. >>> + * -------------------------------- >>> + * >>> + * 0 a 1 >>> + * old: |-----| (bo_offset=n) >>> + * >>> + * 0 a 2 >>> + * req: |-----------| (bo_offset=n) >>> + * >>> + * 0 a 2 >>> + * new: |-----------| (bo_offset=n) >>> + * >>> + * Note: We expect to see the same result for a request with a >>> different bo >>> + * and/or bo_offset. >>> + * >>> + * >>> + * 5) Existent mapping is split. >>> + * ----------------------------- >>> + * >>> + * 0 a 2 >>> + * old: |-----------| (bo_offset=n) >>> + * >>> + * 0 b 1 >>> + * req: |-----| (bo_offset=n) >>> + * >>> + * 0 b 1 a' 2 >>> + * new: |-----|-----| (b.bo_offset=n, a.bo_offset=n+1) >>> + * >>> + * Note: We expect to see the same result for a request with a >>> different bo >>> + * and/or non-contiguous bo_offset. >>> + * >>> + * >>> + * 6) Existent mapping is kept. >>> + * ---------------------------- >>> + * >>> + * 0 a 2 >>> + * old: |-----------| (bo_offset=n) >>> + * >>> + * 0 a 1 >>> + * req: |-----| (bo_offset=n) >>> + * >>> + * 0 a 2 >>> + * new: |-----------| (bo_offset=n) >>> + * >>> + * >>> + * 7) Existent mapping is split. >>> + * ----------------------------- >>> + * >>> + * 0 a 2 >>> + * old: |-----------| (bo_offset=n) >>> + * >>> + * 1 b 2 >>> + * req: |-----| (bo_offset=m) >>> + * >>> + * 0 a 1 b 2 >>> + * new: |-----|-----| (a.bo_offset=n,b.bo_offset=m) >>> + * >>> + * >>> + * 8) Existent mapping is kept. >>> + * ---------------------------- >>> + * >>> + * 0 a 2 >>> + * old: |-----------| (bo_offset=n) >>> + * >>> + * 1 a 2 >>> + * req: |-----| (bo_offset=n+1) >>> + * >>> + * 0 a 2 >>> + * new: |-----------| (bo_offset=n) >>> + * >>> + * >>> + * 9) Existent mapping is split. >>> + * ----------------------------- >>> + * >>> + * 0 a 2 >>> + * old: |-----------| (bo_offset=n) >>> + * >>> + * 1 b 3 >>> + * req: |-----------| (bo_offset=m) >>> + * >>> + * 0 a 1 b 3 >>> + * new: |-----|-----------| (a.bo_offset=n,b.bo_offset=m) >>> + * >>> + * >>> + * 10) Existent mapping is merged. >>> + * ------------------------------- >>> + * >>> + * 0 a 2 >>> + * old: |-----------| (bo_offset=n) >>> + * >>> + * 1 a 3 >>> + * req: |-----------| (bo_offset=n+1) >>> + * >>> + * 0 a 3 >>> + * new: |-----------------| (bo_offset=n) >>> + * >>> + * >>> + * 11) Existent mapping is split. >>> + * ------------------------------ >>> + * >>> + * 0 a 3 >>> + * old: |-----------------| (bo_offset=n) >>> + * >>> + * 1 b 2 >>> + * req: |-----| (bo_offset=m) >>> + * >>> + * 0 a 1 b 2 a' 3 >>> + * new: |-----|-----|-----| >>> (a.bo_offset=n,b.bo_offset=m,a'.bo_offset=n+2) >>> + * >>> + * >>> + * 12) Existent mapping is kept. >>> + * ----------------------------- >>> + * >>> + * 0 a 3 >>> + * old: |-----------------| (bo_offset=n) >>> + * >>> + * 1 a 2 >>> + * req: |-----| (bo_offset=n+1) >>> + * >>> + * 0 a 3 >>> + * old: |-----------------| (bo_offset=n) >>> + * >>> + * >>> + * 13) Existent mapping is replaced. >>> + * --------------------------------- >>> + * >>> + * 1 a 2 >>> + * old: |-----| (bo_offset=n) >>> + * >>> + * 0 a 2 >>> + * req: |-----------| (bo_offset=n) >>> + * >>> + * 0 a 2 >>> + * new: |-----------| (bo_offset=n) >>> + * >>> + * Note: We expect to see the same result for a request with a >>> different bo >>> + * and/or non-contiguous bo_offset. >>> + * >>> + * >>> + * 14) Existent mapping is replaced. >>> + * --------------------------------- >>> + * >>> + * 1 a 2 >>> + * old: |-----| (bo_offset=n) >>> + * >>> + * 0 a 3 >>> + * req: |----------------| (bo_offset=n) >>> + * >>> + * 0 a 3 >>> + * new: |----------------| (bo_offset=n) >>> + * >>> + * Note: We expect to see the same result for a request with a >>> different bo >>> + * and/or non-contiguous bo_offset. >>> + * >>> + * >>> + * 15) Existent mapping is split. >>> + * ------------------------------ >>> + * >>> + * 1 a 3 >>> + * old: |-----------| (bo_offset=n) >>> + * >>> + * 0 b 2 >>> + * req: |-----------| (bo_offset=m) >>> + * >>> + * 0 b 2 a' 3 >>> + * new: |-----------|-----| (b.bo_offset=m,a.bo_offset=n+2) >>> + * >>> + * >>> + * 16) Existent mappings are merged. >>> + * --------------------------------- >>> + * >>> + * 0 a 1 >>> + * old: |-----------| (bo_offset=n) >>> + * >>> + * 2 a 3 >>> + * old': |-----------| (bo_offset=n+2) >>> + * >>> + * 1 a 2 >>> + * req: |-----------| (bo_offset=n+1) >>> + * >>> + * a >>> + * new: |----------------------------------| (bo_offset=n) >>> + */ >>> + >>> +/** >>> + * DOC: Locking >>> + * >>> + * Generally, the GPU VA manager does not take care of locking >>> itself, it is >>> + * the drivers responsibility to take care about locking. Drivers >>> might want to >>> + * protect the following operations: inserting, destroying and >>> iterating >>> + * &drm_gpuva and &drm_gpuva_region objects as well as generating >>> split and merge >>> + * operations. >>> + * >>> + * The GPU VA manager does take care of the locking of the backing >>> + * &drm_gem_object buffers GPU VA lists though, unless the provided >>> functions >>> + * documentation claims otherwise. >>> + */ >>> + >>> +/** >>> + * drm_gpuva_manager_init - initialize a &drm_gpuva_manager >>> + * @mgr: pointer to the &drm_gpuva_manager to initialize >>> + * @name: the name of the GPU VA space >>> + * @start_offset: the start offset of the GPU VA space >>> + * @range: the size of the GPU VA space >>> + * @reserve_offset: the start of the kernel reserved GPU VA area >>> + * @reserve_range: the size of the kernel reserved GPU VA area >>> + * >>> + * The &drm_gpuva_manager must be initialized with this function >>> before use. >>> + * >>> + * Note that @mgr must be cleared to 0 before calling this function. >>> The given >>> + * &name is expected to be managed by the surrounding driver >>> structures. >>> + */ >>> +void >>> +drm_gpuva_manager_init(struct drm_gpuva_manager *mgr, >>> + const char *name, >>> + u64 start_offset, u64 range, >>> + u64 reserve_offset, u64 reserve_range) >>> +{ >>> + drm_mm_init(&mgr->va_mm, start_offset, range); >>> + drm_mm_init(&mgr->region_mm, start_offset, range); >>> + >>> + mgr->mm_start = start_offset; >>> + mgr->mm_range = range; >>> + >>> + mgr->name = name ? name : "unknown"; >>> + >>> + memset(&mgr->kernel_alloc_node, 0, sizeof(struct drm_mm_node)); >>> + mgr->kernel_alloc_node.start = reserve_offset; >>> + mgr->kernel_alloc_node.size = reserve_range; >>> + drm_mm_reserve_node(&mgr->region_mm, &mgr->kernel_alloc_node); >>> +} >>> +EXPORT_SYMBOL(drm_gpuva_manager_init); >>> + >>> +/** >>> + * drm_gpuva_manager_destroy - cleanup a &drm_gpuva_manager >>> + * @mgr: pointer to the &drm_gpuva_manager to clean up >>> + * >>> + * Note that it is a bug to call this function on a manager that still >>> + * holds GPU VA mappings. >>> + */ >>> +void >>> +drm_gpuva_manager_destroy(struct drm_gpuva_manager *mgr) >>> +{ >>> + mgr->name = NULL; >>> + drm_mm_remove_node(&mgr->kernel_alloc_node); >>> + drm_mm_takedown(&mgr->va_mm); >>> + drm_mm_takedown(&mgr->region_mm); >>> +} >>> +EXPORT_SYMBOL(drm_gpuva_manager_destroy); >>> + >>> +static struct drm_gpuva_region * >>> +drm_gpuva_in_region(struct drm_gpuva_manager *mgr, u64 addr, u64 range) >>> +{ >>> + struct drm_gpuva_region *reg; >>> + >>> + /* Find the VA region the requested range is strictly enclosed >>> by. */ >>> + drm_gpuva_for_each_region_in_range(reg, mgr, addr, addr + range) { >>> + if (reg->node.start <= addr && >>> + reg->node.start + reg->node.size >= addr + range && >>> + ®->node != &mgr->kernel_alloc_node) >>> + return reg; >>> + } >>> + >>> + return NULL; >>> +} >>> + >>> +static bool >>> +drm_gpuva_in_any_region(struct drm_gpuva_manager *mgr, u64 addr, u64 >>> range) >>> +{ >>> + return !!drm_gpuva_in_region(mgr, addr, range); >>> +} >>> + >>> +/** >>> + * drm_gpuva_insert - insert a &drm_gpuva >>> + * @mgr: the &drm_gpuva_manager to insert the &drm_gpuva in >>> + * @va: the &drm_gpuva to insert >>> + * @addr: the start address of the GPU VA >>> + * @range: the range of the GPU VA >>> + * >>> + * Insert a &drm_gpuva with a given address and range into a >>> + * &drm_gpuva_manager. >>> + * >>> + * The function assumes the caller does not hold the &drm_gem_object's >>> + * GPU VA list mutex. >>> + * >>> + * Returns: 0 on success, negative error code on failure. >>> + */ >>> +int >>> +drm_gpuva_insert(struct drm_gpuva_manager *mgr, >>> + struct drm_gpuva *va, >>> + u64 addr, u64 range) >>> +{ >>> + struct drm_gpuva_region *reg; >>> + int ret; >>> + >>> + if (!va->gem.obj) >>> + return -EINVAL; >>> + >>> + reg = drm_gpuva_in_region(mgr, addr, range); >>> + if (!reg) >>> + return -EINVAL; >>> + >>> + ret = drm_mm_insert_node_in_range(&mgr->va_mm, &va->node, >>> + range, 0, >>> + 0, addr, >>> + addr + range, >>> + DRM_MM_INSERT_LOW|DRM_MM_INSERT_ONCE); >>> + if (ret) >>> + return ret; >>> + >>> + va->mgr = mgr; >>> + va->region = reg; >>> + >>> + return 0; >>> +} >>> +EXPORT_SYMBOL(drm_gpuva_insert); >>> + >>> +/** >>> + * drm_gpuva_link_locked - link a &drm_gpuva >>> + * @va: the &drm_gpuva to link >>> + * >>> + * This adds the given &va to the GPU VA list of the &drm_gem_object >>> it is >>> + * associated with. >>> + * >>> + * The function assumes the caller already holds the &drm_gem_object's >>> + * GPU VA list mutex. >>> + */ >>> +void >>> +drm_gpuva_link_locked(struct drm_gpuva *va) >>> +{ >>> + lockdep_assert_held(&va->gem.obj->gpuva.mutex); >>> + list_add_tail(&va->head, &va->gem.obj->gpuva.list); >>> +} >>> +EXPORT_SYMBOL(drm_gpuva_link_locked); >>> + >>> +/** >>> + * drm_gpuva_link_unlocked - unlink a &drm_gpuva >>> + * @va: the &drm_gpuva to unlink >>> + * >>> + * This adds the given &va to the GPU VA list of the &drm_gem_object >>> it is >>> + * associated with. >>> + * >>> + * The function assumes the caller does not hold the &drm_gem_object's >>> + * GPU VA list mutex. >>> + */ >>> +void >>> +drm_gpuva_link_unlocked(struct drm_gpuva *va) >>> +{ >>> + drm_gem_gpuva_lock(va->gem.obj); >>> + drm_gpuva_link_locked(va); >>> + drm_gem_gpuva_unlock(va->gem.obj); >>> +} >>> +EXPORT_SYMBOL(drm_gpuva_link_unlocked); >>> + >>> +/** >>> + * drm_gpuva_unlink_locked - unlink a &drm_gpuva >>> + * @va: the &drm_gpuva to unlink >>> + * >>> + * This removes the given &va from the GPU VA list of the >>> &drm_gem_object it is >>> + * associated with. >>> + * >>> + * The function assumes the caller already holds the &drm_gem_object's >>> + * GPU VA list mutex. >>> + */ >>> +void >>> +drm_gpuva_unlink_locked(struct drm_gpuva *va) >>> +{ >>> + lockdep_assert_held(&va->gem.obj->gpuva.mutex); >>> + list_del_init(&va->head); >>> +} >>> +EXPORT_SYMBOL(drm_gpuva_unlink_locked); >>> + >>> +/** >>> + * drm_gpuva_unlink_unlocked - unlink a &drm_gpuva >>> + * @va: the &drm_gpuva to unlink >>> + * >>> + * This removes the given &va from the GPU VA list of the >>> &drm_gem_object it is >>> + * associated with. >>> + * >>> + * The function assumes the caller does not hold the &drm_gem_object's >>> + * GPU VA list mutex. >>> + */ >>> +void >>> +drm_gpuva_unlink_unlocked(struct drm_gpuva *va) >>> +{ >>> + drm_gem_gpuva_lock(va->gem.obj); >>> + drm_gpuva_unlink_locked(va); >>> + drm_gem_gpuva_unlock(va->gem.obj); >>> +} >>> +EXPORT_SYMBOL(drm_gpuva_unlink_unlocked); >>> + >>> +/** >>> + * drm_gpuva_destroy_locked - destroy a &drm_gpuva >>> + * @va: the &drm_gpuva to destroy >>> + * >>> + * This removes the given &va from GPU VA list of the >>> &drm_gem_object it is >>> + * associated with and removes it from the underlaying range allocator. >>> + * >>> + * The function assumes the caller already holds the &drm_gem_object's >>> + * GPU VA list mutex. >>> + */ >>> +void >>> +drm_gpuva_destroy_locked(struct drm_gpuva *va) >>> +{ >>> + lockdep_assert_held(&va->gem.obj->gpuva.mutex); >>> + >>> + list_del(&va->head); >>> + drm_mm_remove_node(&va->node); >>> +} >>> +EXPORT_SYMBOL(drm_gpuva_destroy_locked); >>> + >>> +/** >>> + * drm_gpuva_destroy_unlocked - destroy a &drm_gpuva >>> + * @va: the &drm_gpuva to destroy >>> + * >>> + * This removes the given &va from GPU VA list of the >>> &drm_gem_object it is >>> + * associated with and removes it from the underlaying range allocator. >>> + * >>> + * The function assumes the caller does not hold the &drm_gem_object's >>> + * GPU VA list mutex. >>> + */ >>> +void >>> +drm_gpuva_destroy_unlocked(struct drm_gpuva *va) >>> +{ >>> + drm_gem_gpuva_lock(va->gem.obj); >>> + list_del(&va->head); >>> + drm_gem_gpuva_unlock(va->gem.obj); >>> + >>> + drm_mm_remove_node(&va->node); >>> +} >>> +EXPORT_SYMBOL(drm_gpuva_destroy_unlocked); >>> + >>> +/** >>> + * drm_gpuva_find - find a &drm_gpuva >>> + * @mgr: the &drm_gpuva_manager to search in >>> + * @addr: the &drm_gpuvas address >>> + * @range: the &drm_gpuvas range >>> + * >>> + * Returns: the &drm_gpuva at a given &addr and with a given &range >>> + */ >>> +struct drm_gpuva * >>> +drm_gpuva_find(struct drm_gpuva_manager *mgr, >>> + u64 addr, u64 range) >>> +{ >>> + struct drm_gpuva *va; >>> + >>> + drm_gpuva_for_each_va_in_range(va, mgr, addr, range) { >>> + if (va->node.start == addr && >>> + va->node.size == range) >>> + return va; >>> + } >>> + >>> + return NULL; >>> +} >>> +EXPORT_SYMBOL(drm_gpuva_find); >>> + >>> +/** >>> + * drm_gpuva_find_prev - find the &drm_gpuva before the given address >>> + * @mgr: the &drm_gpuva_manager to search in >>> + * @start: the given GPU VA's start address >>> + * >>> + * Find the adjacent &drm_gpuva before the GPU VA with given &start >>> address. >>> + * >>> + * Note that if there is any free space between the GPU VA mappings >>> no mapping >>> + * is returned. >>> + * >>> + * Returns: a pointer to the found &drm_gpuva or NULL if none was found >>> + */ >>> +struct drm_gpuva * >>> +drm_gpuva_find_prev(struct drm_gpuva_manager *mgr, u64 start) >>> +{ >>> + struct drm_mm_node *node; >>> + >>> + if (start <= mgr->mm_start || >>> + start > (mgr->mm_start + mgr->mm_range)) >>> + return NULL; >>> + >>> + node = __drm_mm_interval_first(&mgr->va_mm, start - 1, start); >>> + if (node == &mgr->va_mm.head_node) >>> + return NULL; >>> + >>> + return (struct drm_gpuva *)node; >>> +} >>> +EXPORT_SYMBOL(drm_gpuva_find_prev); >>> + >>> +/** >>> + * drm_gpuva_find_next - find the &drm_gpuva after the given address >>> + * @mgr: the &drm_gpuva_manager to search in >>> + * @end: the given GPU VA's end address >>> + * >>> + * Find the adjacent &drm_gpuva after the GPU VA with given &end >>> address. >>> + * >>> + * Note that if there is any free space between the GPU VA mappings >>> no mapping >>> + * is returned. >>> + * >>> + * Returns: a pointer to the found &drm_gpuva or NULL if none was found >>> + */ >>> +struct drm_gpuva * >>> +drm_gpuva_find_next(struct drm_gpuva_manager *mgr, u64 end) >>> +{ >>> + struct drm_mm_node *node; >>> + >>> + if (end < mgr->mm_start || >>> + end >= (mgr->mm_start + mgr->mm_range)) >>> + return NULL; >>> + >>> + node = __drm_mm_interval_first(&mgr->va_mm, end, end + 1); >>> + if (node == &mgr->va_mm.head_node) >>> + return NULL; >>> + >>> + return (struct drm_gpuva *)node; >>> +} >>> +EXPORT_SYMBOL(drm_gpuva_find_next); >>> + >>> +/** >>> + * drm_gpuva_region_insert - insert a &drm_gpuva_region >>> + * @mgr: the &drm_gpuva_manager to insert the &drm_gpuva in >>> + * @reg: the &drm_gpuva_region to insert >>> + * @addr: the start address of the GPU VA >>> + * @range: the range of the GPU VA >>> + * >>> + * Insert a &drm_gpuva_region with a given address and range into a >>> + * &drm_gpuva_manager. >>> + * >>> + * Returns: 0 on success, negative error code on failure. >>> + */ >>> +int >>> +drm_gpuva_region_insert(struct drm_gpuva_manager *mgr, >>> + struct drm_gpuva_region *reg, >>> + u64 addr, u64 range) >>> +{ >>> + int ret; >>> + >>> + ret = drm_mm_insert_node_in_range(&mgr->region_mm, ®->node, >>> + range, 0, >>> + 0, addr, >>> + addr + range, >>> + DRM_MM_INSERT_LOW| >>> + DRM_MM_INSERT_ONCE); >>> + if (ret) >>> + return ret; >>> + >>> + reg->mgr = mgr; >>> + >>> + return 0; >>> +} >>> +EXPORT_SYMBOL(drm_gpuva_region_insert); >>> + >>> +/** >>> + * drm_gpuva_region_destroy - destroy a &drm_gpuva_region >>> + * @mgr: the &drm_gpuva_manager holding the region >>> + * @reg: the &drm_gpuva to destroy >>> + * >>> + * This removes the given ® from the underlaying range allocator. >>> + */ >>> +void >>> +drm_gpuva_region_destroy(struct drm_gpuva_manager *mgr, >>> + struct drm_gpuva_region *reg) >>> +{ >>> + struct drm_gpuva *va; >>> + >>> + drm_gpuva_for_each_va_in_range(va, mgr, >>> + reg->node.start, >>> + reg->node.size) { >>> + WARN(1, "GPU VA region must be empty on destroy.\n"); >>> + return; >>> + } >>> + >>> + if (®->node == &mgr->kernel_alloc_node) { >>> + WARN(1, "Can't destroy kernel reserved region.\n"); >>> + return; >>> + } >>> + >>> + drm_mm_remove_node(®->node); >>> +} >>> +EXPORT_SYMBOL(drm_gpuva_region_destroy); >>> + >>> +/** >>> + * drm_gpuva_region_find - find a &drm_gpuva_region >>> + * @mgr: the &drm_gpuva_manager to search in >>> + * @addr: the &drm_gpuva_regions address >>> + * @range: the &drm_gpuva_regions range >>> + * >>> + * Returns: the &drm_gpuva_region at a given &addr and with a given >>> &range >>> + */ >>> +struct drm_gpuva_region * >>> +drm_gpuva_region_find(struct drm_gpuva_manager *mgr, >>> + u64 addr, u64 range) >>> +{ >>> + struct drm_gpuva_region *reg; >>> + >>> + drm_gpuva_for_each_region_in_range(reg, mgr, addr, addr + range) >>> + if (reg->node.start == addr && >>> + reg->node.size == range) >>> + return reg; >>> + >>> + return NULL; >>> +} >>> +EXPORT_SYMBOL(drm_gpuva_region_find); >>> + >>> +static int >>> +gpuva_op_map_new(struct drm_gpuva_op **pop, >>> + u64 addr, u64 range, >>> + struct drm_gem_object *obj, u64 offset) >>> +{ >>> + struct drm_gpuva_op *op; >>> + >>> + op = *pop = kzalloc(sizeof(*op), GFP_KERNEL); >>> + if (!op) >>> + return -ENOMEM; >>> + >>> + op->op = DRM_GPUVA_OP_MAP; >>> + op->map.va.addr = addr; >>> + op->map.va.range = range; >>> + op->map.gem.obj = obj; >>> + op->map.gem.offset = offset; >>> + >>> + return 0; >>> +} >>> + >>> +static int >>> +gpuva_op_remap_new(struct drm_gpuva_op **pop, >>> + struct drm_gpuva_op_map *prev, >>> + struct drm_gpuva_op_map *next, >>> + struct drm_gpuva_op_unmap *unmap) >>> +{ >>> + struct drm_gpuva_op *op; >>> + struct drm_gpuva_op_remap *r; >>> + >>> + op = *pop = kzalloc(sizeof(*op), GFP_KERNEL); >>> + if (!op) >>> + return -ENOMEM; >>> + >>> + op->op = DRM_GPUVA_OP_REMAP; >>> + r = &op->remap; >>> + >>> + if (prev) { >>> + r->prev = kmemdup(prev, sizeof(*prev), GFP_KERNEL); >>> + if (!r->prev) >>> + goto err_free_op; >>> + } >>> + >>> + if (next) { >>> + r->next = kmemdup(next, sizeof(*next), GFP_KERNEL); >>> + if (!r->next) >>> + goto err_free_prev; >>> + } >>> + >>> + r->unmap = kmemdup(unmap, sizeof(*unmap), GFP_KERNEL); >>> + if (!r->unmap) >>> + goto err_free_next; >>> + >>> + return 0; >>> + >>> +err_free_next: >>> + if (next) >>> + kfree(r->next); >>> +err_free_prev: >>> + if (prev) >>> + kfree(r->prev); >>> +err_free_op: >>> + kfree(op); >>> + *pop = NULL; >>> + >>> + return -ENOMEM; >>> +} >>> + >>> +static int >>> +gpuva_op_unmap_new(struct drm_gpuva_op **pop, >>> + struct drm_gpuva *va, bool merge) >>> +{ >>> + struct drm_gpuva_op *op; >>> + >>> + op = *pop = kzalloc(sizeof(*op), GFP_KERNEL); >>> + if (!op) >>> + return -ENOMEM; >>> + >>> + op->op = DRM_GPUVA_OP_UNMAP; >>> + op->unmap.va = va; >>> + op->unmap.keep = merge; >>> + >>> + return 0; >>> +} >>> + >>> +#define op_map_new_to_list(_ops, _addr, _range, \ >>> + _obj, _offset) \ >>> +do { \ >>> + struct drm_gpuva_op *op; \ >>> + \ >>> + ret = gpuva_op_map_new(&op, _addr, _range, \ >>> + _obj, _offset); \ >>> + if (ret) \ >>> + goto err_free_ops; \ >>> + \ >>> + list_add_tail(&op->entry, _ops); \ >>> +} while (0) >>> + >>> +#define op_remap_new_to_list(_ops, _prev, _next, \ >>> + _unmap) \ >>> +do { \ >>> + struct drm_gpuva_op *op; \ >>> + \ >>> + ret = gpuva_op_remap_new(&op, _prev, _next, \ >>> + _unmap); \ >>> + if (ret) \ >>> + goto err_free_ops; \ >>> + \ >>> + list_add_tail(&op->entry, _ops); \ >>> +} while (0) >>> + >>> +#define op_unmap_new_to_list(_ops, _gpuva, _merge) \ >>> +do { \ >>> + struct drm_gpuva_op *op; \ >>> + \ >>> + ret = gpuva_op_unmap_new(&op, _gpuva, _merge); \ >>> + if (ret) \ >>> + goto err_free_ops; \ >>> + \ >>> + list_add_tail(&op->entry, _ops); \ >>> +} while (0) >>> + >>> +/** >>> + * drm_gpuva_sm_map_ops_create - creates the &drm_gpuva_ops to split >>> and merge >>> + * @mgr: the &drm_gpuva_manager representing the GPU VA space >>> + * @req_addr: the start address of the new mapping >>> + * @req_range: the range of the new mapping >>> + * @req_obj: the &drm_gem_object to map >>> + * @req_offset: the offset within the &drm_gem_object >>> + * >>> + * This function creates a list of operations to perform splitting >>> and merging >>> + * of existent mapping(s) with the newly requested one. >>> + * >>> + * The list can be iterated with &drm_gpuva_for_each_op and must be >>> processed >>> + * in the given order. It can contain map, unmap and remap >>> operations, but it >>> + * also can be empty if no operation is required, e.g. if the >>> requested mapping >>> + * already exists is the exact same way. >>> + * >>> + * There can be an arbitrary amount of unmap operations, a maximum >>> of two remap >>> + * operations and a single map operation. The latter one, if existent, >>> + * represents the original map operation requested by the caller. >>> Please note >>> + * that the map operation might has been modified, e.g. if it was >>> + * merged with an existent mapping. >>> + * >>> + * Note that before calling this function again with another mapping >>> request it >>> + * is necessary to update the &drm_gpuva_manager's view of the GPU >>> VA space. >>> + * The previously obtained operations must be either processed or >>> abandoned. >>> + * To update the &drm_gpuva_manager's view of the GPU VA space >>> + * drm_gpuva_insert(), drm_gpuva_destroy_locked() and/or >>> + * drm_gpuva_destroy_unlocked() should be used. >>> + * >>> + * After the caller finished processing the returned &drm_gpuva_ops, >>> they must >>> + * be freed with &drm_gpuva_ops_free. >>> + * >>> + * Returns: a pointer to the &drm_gpuva_ops on success, an ERR_PTR >>> on failure >>> + */ >>> +struct drm_gpuva_ops * >>> +drm_gpuva_sm_map_ops_create(struct drm_gpuva_manager *mgr, >>> + u64 req_addr, u64 req_range, >>> + struct drm_gem_object *req_obj, u64 req_offset) >>> +{ >>> + struct drm_gpuva_ops *ops; >>> + struct drm_gpuva *va, *prev = NULL; >>> + u64 req_end = req_addr + req_range; >>> + bool skip_pmerge = false, skip_nmerge = false; >>> + int ret; >>> + >>> + if (!drm_gpuva_in_any_region(mgr, req_addr, req_range)) >>> + return ERR_PTR(-EINVAL); >>> + >>> + ops = kzalloc(sizeof(*ops), GFP_KERNEL); >>> + if (!ops) >>> + return ERR_PTR(-ENOMEM); >>> + >>> + INIT_LIST_HEAD(&ops->list); >>> + >>> + drm_gpuva_for_each_va_in_range(va, mgr, req_addr, req_end) { >>> + struct drm_gem_object *obj = va->gem.obj; >>> + u64 offset = va->gem.offset; >>> + u64 addr = va->node.start; >>> + u64 range = va->node.size; >>> + u64 end = addr + range; >>> + >>> + /* Generally, we want to skip merging with potential mappings >>> + * left and right of the requested one when we found a >>> + * collision, since merging happens in this loop already. >>> + * >>> + * However, there is one exception when the requested mapping >>> + * spans into a free VM area. If this is the case we might >>> + * still hit the boundary of another mapping before and/or >>> + * after the free VM area. >>> + */ >>> + skip_pmerge = true; >>> + skip_nmerge = true; >>> + >>> + if (addr == req_addr) { >>> + bool merge = obj == req_obj && >>> + offset == req_offset; >>> + if (end == req_end) { >>> + if (merge) >>> + goto done; >>> + >>> + op_unmap_new_to_list(&ops->list, va, false); >>> + break; >>> + } >>> + >>> + if (end < req_end) { >>> + skip_nmerge = false; >>> + op_unmap_new_to_list(&ops->list, va, merge); >>> + goto next; >>> + } >>> + >>> + if (end > req_end) { >>> + struct drm_gpuva_op_map n = { >>> + .va.addr = req_end, >>> + .va.range = range - req_range, >>> + .gem.obj = obj, >>> + .gem.offset = offset + req_range, >>> + }; >>> + struct drm_gpuva_op_unmap u = { .va = va }; >>> + >>> + if (merge) >>> + goto done; >>> + >>> + op_remap_new_to_list(&ops->list, NULL, &n, &u); >>> + break; >>> + } >>> + } else if (addr < req_addr) { >>> + u64 ls_range = req_addr - addr; >>> + struct drm_gpuva_op_map p = { >>> + .va.addr = addr, >>> + .va.range = ls_range, >>> + .gem.obj = obj, >>> + .gem.offset = offset, >>> + }; >>> + struct drm_gpuva_op_unmap u = { .va = va }; >>> + bool merge = obj == req_obj && >>> + offset + ls_range == req_offset; >>> + >>> + if (end == req_end) { >>> + if (merge) >>> + goto done; >>> + >>> + op_remap_new_to_list(&ops->list, &p, NULL, &u); >>> + break; >>> + } >>> + >>> + if (end < req_end) { >>> + u64 new_addr = addr; >>> + u64 new_range = req_range + ls_range; >>> + u64 new_offset = offset; >>> + >>> + /* We validated that the requested mapping is >>> + * within a single VA region already. >>> + * Since it overlaps the current mapping (which >>> + * can't cross a VA region boundary) we can be >>> + * sure that we're still within the boundaries >>> + * of the same VA region after merging. >>> + */ >>> + if (merge) { >>> + req_offset = new_offset; >>> + req_addr = new_addr; >>> + req_range = new_range; >>> + op_unmap_new_to_list(&ops->list, va, true); >>> + goto next; >>> + } >>> + >>> + op_remap_new_to_list(&ops->list, &p, NULL, &u); >>> + goto next; >>> + } >>> + >>> + if (end > req_end) { >>> + struct drm_gpuva_op_map n = { >>> + .va.addr = req_end, >>> + .va.range = end - req_end, >>> + .gem.obj = obj, >>> + .gem.offset = offset + ls_range + >>> + req_range, >>> + }; >>> + >>> + if (merge) >>> + goto done; >>> + >>> + op_remap_new_to_list(&ops->list, &p, &n, &u); >>> + break; >>> + } >>> + } else if (addr > req_addr) { >>> + bool merge = obj == req_obj && >>> + offset == req_offset + >>> + (addr - req_addr); >>> + if (!prev) >>> + skip_pmerge = false; >>> + >>> + if (end == req_end) { >>> + op_unmap_new_to_list(&ops->list, va, merge); >>> + break; >>> + } >>> + >>> + if (end < req_end) { >>> + skip_nmerge = false; >>> + op_unmap_new_to_list(&ops->list, va, merge); >>> + goto next; >>> + } >>> + >>> + if (end > req_end) { >>> + struct drm_gpuva_op_map n = { >>> + .va.addr = req_end, >>> + .va.range = end - req_end, >>> + .gem.obj = obj, >>> + .gem.offset = offset + req_end - addr, >>> + }; >>> + struct drm_gpuva_op_unmap u = { .va = va }; >>> + u64 new_end = end; >>> + u64 new_range = new_end - req_addr; >>> + >>> + /* We validated that the requested mapping is >>> + * within a single VA region already. >>> + * Since it overlaps the current mapping (which >>> + * can't cross a VA region boundary) we can be >>> + * sure that we're still within the boundaries >>> + * of the same VA region after merging. >>> + */ >>> + if (merge) { >>> + req_end = new_end; >>> + req_range = new_range; >>> + op_unmap_new_to_list(&ops->list, va, true); >>> + break; >>> + } >>> + >>> + op_remap_new_to_list(&ops->list, NULL, &n, &u); >>> + break; >>> + } >>> + } >>> +next: >>> + prev = va; >>> + } >>> + >>> + va = skip_pmerge ? NULL : drm_gpuva_find_prev(mgr, req_addr); >>> + if (va) { >>> + struct drm_gem_object *obj = va->gem.obj; >>> + u64 offset = va->gem.offset; >>> + u64 addr = va->node.start; >>> + u64 range = va->node.size; >>> + u64 new_offset = offset; >>> + u64 new_addr = addr; >>> + u64 new_range = req_range + range; >>> + bool merge = obj == req_obj && >>> + offset + range == req_offset; >>> + >>> + /* Don't merge over VA region boundaries. */ >>> + merge &= drm_gpuva_in_any_region(mgr, new_addr, new_range); >>> + if (merge) { >>> + op_unmap_new_to_list(&ops->list, va, true); >>> + >>> + req_offset = new_offset; >>> + req_addr = new_addr; >>> + req_range = new_range; >>> + } >>> + } >>> + >>> + va = skip_nmerge ? NULL : drm_gpuva_find_next(mgr, req_end); >>> + if (va) { >>> + struct drm_gem_object *obj = va->gem.obj; >>> + u64 offset = va->gem.offset; >>> + u64 addr = va->node.start; >>> + u64 range = va->node.size; >>> + u64 end = addr + range; >>> + u64 new_range = req_range + range; >>> + u64 new_end = end; >>> + bool merge = obj == req_obj && >>> + offset == req_offset + req_range; >>> + >>> + /* Don't merge over VA region boundaries. */ >>> + merge &= drm_gpuva_in_any_region(mgr, req_addr, new_range); >>> + if (merge) { >>> + op_unmap_new_to_list(&ops->list, va, true); >>> + >>> + req_range = new_range; >>> + req_end = new_end; >>> + } >>> + } >>> + >>> + op_map_new_to_list(&ops->list, >>> + req_addr, req_range, >>> + req_obj, req_offset); >>> + >>> +done: >>> + return ops; >>> + >>> +err_free_ops: >>> + drm_gpuva_ops_free(ops); >>> + return ERR_PTR(ret); >>> +} >>> +EXPORT_SYMBOL(drm_gpuva_sm_map_ops_create); >>> + >>> +#undef op_map_new_to_list >>> +#undef op_remap_new_to_list >>> +#undef op_unmap_new_to_list >>> + >>> +/** >>> + * drm_gpuva_sm_unmap_ops_create - creates the &drm_gpuva_ops to >>> split on unmap >>> + * @mgr: the &drm_gpuva_manager representing the GPU VA space >>> + * @req_addr: the start address of the range to unmap >>> + * @req_range: the range of the mappings to unmap >>> + * >>> + * This function creates a list of operations to perform unmapping >>> and, if >>> + * required, splitting of the mappings overlapping the unmap range. >>> + * >>> + * The list can be iterated with &drm_gpuva_for_each_op and must be >>> processed >>> + * in the given order. It can contain unmap and remap operations, >>> depending on >>> + * whether there are actual overlapping mappings to split. >>> + * >>> + * There can be an arbitrary amount of unmap operations and a >>> maximum of two >>> + * remap operations. >>> + * >>> + * Note that before calling this function again with another range >>> to unmap it >>> + * is necessary to update the &drm_gpuva_manager's view of the GPU >>> VA space. >>> + * The previously obtained operations must be processed or abandoned. >>> + * To update the &drm_gpuva_manager's view of the GPU VA space >>> + * drm_gpuva_insert(), drm_gpuva_destroy_locked() and/or >>> + * drm_gpuva_destroy_unlocked() should be used. >>> + * >>> + * After the caller finished processing the returned &drm_gpuva_ops, >>> they must >>> + * be freed with &drm_gpuva_ops_free. >>> + * >>> + * Returns: a pointer to the &drm_gpuva_ops on success, an ERR_PTR >>> on failure >>> + */ >>> +struct drm_gpuva_ops * >>> +drm_gpuva_sm_unmap_ops_create(struct drm_gpuva_manager *mgr, >>> + u64 req_addr, u64 req_range) >>> +{ >>> + struct drm_gpuva_ops *ops; >>> + struct drm_gpuva_op *op; >>> + struct drm_gpuva_op_remap *r; >>> + struct drm_gpuva *va; >>> + u64 req_end = req_addr + req_range; >>> + int ret; >>> + >>> + ops = kzalloc(sizeof(*ops), GFP_KERNEL); >>> + if (!ops) >>> + return ERR_PTR(-ENOMEM); >>> + >>> + INIT_LIST_HEAD(&ops->list); >>> + >>> + drm_gpuva_for_each_va_in_range(va, mgr, req_addr, req_end) { >>> + struct drm_gem_object *obj = va->gem.obj; >>> + u64 offset = va->gem.offset; >>> + u64 addr = va->node.start; >>> + u64 range = va->node.size; >>> + u64 end = addr + range; >>> + >>> + op = kzalloc(sizeof(*op), GFP_KERNEL); >>> + if (!op) { >>> + ret = -ENOMEM; >>> + goto err_free_ops; >>> + } >>> + >>> + r = &op->remap; >>> + >>> + if (addr < req_addr) { >>> + r->prev = kzalloc(sizeof(*r->prev), GFP_KERNEL); >>> + if (!r->prev) { >>> + ret = -ENOMEM; >>> + goto err_free_op; >>> + } >>> + >>> + r->prev->va.addr = addr; >>> + r->prev->va.range = req_addr - addr; >>> + r->prev->gem.obj = obj; >>> + r->prev->gem.offset = offset; >>> + } >>> + >>> + if (end > req_end) { >>> + r->next = kzalloc(sizeof(*r->next), GFP_KERNEL); >>> + if (!r->next) { >>> + ret = -ENOMEM; >>> + goto err_free_prev; >>> + } >>> + >>> + r->next->va.addr = req_end; >>> + r->next->va.range = end - req_end; >>> + r->next->gem.obj = obj; >>> + r->next->gem.offset = offset + (req_end - addr); >>> + } >>> + >>> + if (op->remap.prev || op->remap.next) { >>> + op->op = DRM_GPUVA_OP_REMAP; >>> + r->unmap = kzalloc(sizeof(*r->unmap), GFP_KERNEL); >>> + if (!r->unmap) { >>> + ret = -ENOMEM; >>> + goto err_free_next; >>> + } >>> + >>> + r->unmap->va = va; >>> + } else { >>> + op->op = DRM_GPUVA_OP_UNMAP; >>> + op->unmap.va = va; >>> + } >>> + >>> + list_add_tail(&op->entry, &ops->list); >>> + } >>> + >>> + return ops; >>> + >>> +err_free_next: >>> + if (r->next) >>> + kfree(r->next); >>> +err_free_prev: >>> + if (r->prev) >>> + kfree(r->prev); >>> +err_free_op: >>> + kfree(op); >>> +err_free_ops: >>> + drm_gpuva_ops_free(ops); >>> + return ERR_PTR(ret); >>> +} >>> +EXPORT_SYMBOL(drm_gpuva_sm_unmap_ops_create); >>> + >>> +/** >>> + * drm_gpuva_ops_free - free the given &drm_gpuva_ops >>> + * @ops: the &drm_gpuva_ops to free >>> + * >>> + * Frees the given &drm_gpuva_ops structure including all the ops >>> associated >>> + * with it. >>> + */ >>> +void >>> +drm_gpuva_ops_free(struct drm_gpuva_ops *ops) >>> +{ >>> + struct drm_gpuva_op *op, *next; >>> + >>> + drm_gpuva_for_each_op_safe(op, next, ops) { >>> + list_del(&op->entry); >>> + if (op->op == DRM_GPUVA_OP_REMAP) { >>> + if (op->remap.prev) >>> + kfree(op->remap.prev); >>> + >>> + if (op->remap.next) >>> + kfree(op->remap.next); >>> + >>> + kfree(op->remap.unmap); >>> + } >>> + kfree(op); >>> + } >>> + >>> + kfree(ops); >>> +} >>> +EXPORT_SYMBOL(drm_gpuva_ops_free); >>> diff --git a/include/drm/drm_drv.h b/include/drm/drm_drv.h >>> index d7c521e8860f..6feacd93aca6 100644 >>> --- a/include/drm/drm_drv.h >>> +++ b/include/drm/drm_drv.h >>> @@ -104,6 +104,12 @@ enum drm_driver_feature { >>> * acceleration should be handled by two drivers that are >>> connected using auxiliary bus. >>> */ >>> DRIVER_COMPUTE_ACCEL = BIT(7), >>> + /** >>> + * @DRIVER_GEM_GPUVA: >>> + * >>> + * Driver supports user defined GPU VA bindings for GEM objects. >>> + */ >>> + DRIVER_GEM_GPUVA = BIT(8), >>> /* IMPORTANT: Below are all the legacy flags, add new ones >>> above. */ >>> diff --git a/include/drm/drm_gem.h b/include/drm/drm_gem.h >>> index 772a4adf5287..4a3679034966 100644 >>> --- a/include/drm/drm_gem.h >>> +++ b/include/drm/drm_gem.h >>> @@ -36,6 +36,8 @@ >>> #include <linux/kref.h> >>> #include <linux/dma-resv.h> >>> +#include <linux/list.h> >>> +#include <linux/mutex.h> >>> #include <drm/drm_vma_manager.h> >>> @@ -337,6 +339,17 @@ struct drm_gem_object { >>> */ >>> struct dma_resv _resv; >>> + /** >>> + * @gpuva: >>> + * >>> + * Provides the list and list mutex of GPU VAs attached to this >>> + * GEM object. >>> + */ >>> + struct { >>> + struct list_head list; >>> + struct mutex mutex; >>> + } gpuva; >>> + >>> /** >>> * @funcs: >>> * >>> @@ -479,4 +492,66 @@ void drm_gem_lru_move_tail(struct drm_gem_lru >>> *lru, struct drm_gem_object *obj); >>> unsigned long drm_gem_lru_scan(struct drm_gem_lru *lru, unsigned >>> nr_to_scan, >>> bool (*shrink)(struct drm_gem_object *obj)); >>> +/** >>> + * drm_gem_gpuva_init - initialize the gpuva list of a GEM object >>> + * @obj: the &drm_gem_object >>> + * >>> + * This initializes the &drm_gem_object's &drm_gpuva list and the mutex >>> + * protecting it. >>> + * >>> + * Calling this function is only necessary for drivers intending to >>> support the >>> + * &drm_driver_feature DRIVER_GEM_GPUVA. >>> + */ >>> +static inline void drm_gem_gpuva_init(struct drm_gem_object *obj) >>> +{ >>> + INIT_LIST_HEAD(&obj->gpuva.list); >>> + mutex_init(&obj->gpuva.mutex); >>> +} >>> + >>> +/** >>> + * drm_gem_gpuva_lock - lock the GEM's gpuva list mutex >>> + * @obj: the &drm_gem_object >>> + * >>> + * This unlocks the mutex protecting the &drm_gem_object's >>> &drm_gpuva list. >>> + */ >>> +static inline void drm_gem_gpuva_lock(struct drm_gem_object *obj) >>> +{ >>> + mutex_lock(&obj->gpuva.mutex); >>> +} >>> + >>> +/** >>> + * drm_gem_gpuva_unlock - unlock the GEM's gpuva list mutex >>> + * @obj: the &drm_gem_object >>> + * >>> + * This unlocks the mutex protecting the &drm_gem_object's >>> &drm_gpuva list. >>> + */ >>> +static inline void drm_gem_gpuva_unlock(struct drm_gem_object *obj) >>> +{ >>> + mutex_unlock(&obj->gpuva.mutex); >>> +} >>> + >>> +/** >>> + * drm_gem_for_each_gpuva - iternator to walk over a list of gpuvas >>> + * @entry: &drm_gpuva structure to assign to in each iteration step >>> + * @obj: the &drm_gem_object the &drm_gpuvas to walk are associated >>> with >>> + * >>> + * This iterator walks over all &drm_gpuva structures associated >>> with the >>> + * &drm_gpuva_manager. >>> + */ >>> +#define drm_gem_for_each_gpuva(entry, obj) \ >>> + list_for_each_entry(entry, &obj->gpuva.list, head) >>> + >>> +/** >>> + * drm_gem_for_each_gpuva_safe - iternator to safely walk over a >>> list of gpuvas >>> + * @entry: &drm_gpuva structure to assign to in each iteration step >>> + * @next: &next &drm_gpuva to store the next step >>> + * @obj: the &drm_gem_object the &drm_gpuvas to walk are associated >>> with >>> + * >>> + * This iterator walks over all &drm_gpuva structures associated >>> with the >>> + * &drm_gem_object. It is implemented with >>> list_for_each_entry_safe(), hence >>> + * it is save against removal of elements. >>> + */ >>> +#define drm_gem_for_each_gpuva_safe(entry, next, obj) \ >>> + list_for_each_entry_safe(entry, next, &obj->gpuva.list, head) >>> + >>> #endif /* __DRM_GEM_H__ */ >>> diff --git a/include/drm/drm_gpuva_mgr.h b/include/drm/drm_gpuva_mgr.h >>> new file mode 100644 >>> index 000000000000..adeb0c916e91 >>> --- /dev/null >>> +++ b/include/drm/drm_gpuva_mgr.h >>> @@ -0,0 +1,527 @@ >>> +// SPDX-License-Identifier: GPL-2.0 >>> + >>> +#ifndef __DRM_GPUVA_MGR_H__ >>> +#define __DRM_GPUVA_MGR_H__ >>> + >>> +/* >>> + * Copyright (c) 2022 Red Hat. >>> + * >>> + * Permission is hereby granted, free of charge, to any person >>> obtaining a >>> + * copy of this software and associated documentation files (the >>> "Software"), >>> + * to deal in the Software without restriction, including without >>> limitation >>> + * the rights to use, copy, modify, merge, publish, distribute, >>> sublicense, >>> + * and/or sell copies of the Software, and to permit persons to whom >>> the >>> + * Software is furnished to do so, subject to the following conditions: >>> + * >>> + * The above copyright notice and this permission notice shall be >>> included in >>> + * all copies or substantial portions of the Software. >>> + * >>> + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, >>> EXPRESS OR >>> + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF >>> MERCHANTABILITY, >>> + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO >>> EVENT SHALL >>> + * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, >>> DAMAGES OR >>> + * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR >>> OTHERWISE, >>> + * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE >>> USE OR >>> + * OTHER DEALINGS IN THE SOFTWARE. >>> + */ >>> + >>> +#include <drm/drm_mm.h> >>> +#include <linux/mm.h> >>> +#include <linux/rbtree.h> >>> +#include <linux/spinlock.h> >>> +#include <linux/types.h> >>> + >>> +struct drm_gpuva_region; >>> +struct drm_gpuva; >>> +struct drm_gpuva_ops; >>> + >>> +/** >>> + * struct drm_gpuva_manager - DRM GPU VA Manager >>> + * >>> + * The DRM GPU VA Manager keeps track of a GPU's virtual address >>> space by using >>> + * the &drm_mm range allocator. Typically, this structure is >>> embedded in bigger >>> + * driver structures. >>> + * >>> + * Drivers can pass addresses and ranges in an arbitrary unit, e.g. >>> bytes or >>> + * pages. >>> + * >>> + * There should be one manager instance per GPU virtual address space. >>> + */ >>> +struct drm_gpuva_manager { >>> + /** >>> + * @name: the name of the DRM GPU VA space >>> + */ >>> + const char *name; >>> + >>> + /** >>> + * @mm_start: start of the VA space >>> + */ >>> + u64 mm_start; >>> + >>> + /** >>> + * @mm_range: length of the VA space >>> + */ >>> + u64 mm_range; >>> + >>> + /** >>> + * @region_mm: the &drm_mm range allocator to track GPU VA regions >>> + */ >>> + struct drm_mm region_mm; >>> + >>> + /** >>> + * @va_mm: the &drm_mm range allocator to track GPU VA mappings >>> + */ >>> + struct drm_mm va_mm; >>> + >>> + /** >>> + * @kernel_alloc_node: >>> + * >>> + * &drm_mm_node representing the address space cutout reserved for >>> + * the kernel >>> + */ >>> + struct drm_mm_node kernel_alloc_node; >>> +}; >>> + >>> +void drm_gpuva_manager_init(struct drm_gpuva_manager *mgr, >>> + const char *name, >>> + u64 start_offset, u64 range, >>> + u64 reserve_offset, u64 reserve_range); >>> +void drm_gpuva_manager_destroy(struct drm_gpuva_manager *mgr); >>> + >>> +/** >>> + * struct drm_gpuva_region - structure to track a portion of GPU VA >>> space >>> + * >>> + * This structure represents a portion of a GPUs VA space and is >>> associated >>> + * with a &drm_gpuva_manager. Internally it is based on a &drm_mm_node. >>> + * >>> + * GPU VA mappings, represented by &drm_gpuva objects, are >>> restricted to be >>> + * placed within a &drm_gpuva_region. >>> + */ >>> +struct drm_gpuva_region { >>> + /** >>> + * @node: the &drm_mm_node to track the GPU VA region >>> + */ >>> + struct drm_mm_node node; >>> + >>> + /** >>> + * @mgr: the &drm_gpuva_manager this object is associated with >>> + */ >>> + struct drm_gpuva_manager *mgr; >>> + >>> + /** >>> + * @sparse: indicates whether this region is sparse >>> + */ >>> + bool sparse; >>> +}; >>> + >>> +struct drm_gpuva_region * >>> +drm_gpuva_region_find(struct drm_gpuva_manager *mgr, >>> + u64 addr, u64 range); >>> +int drm_gpuva_region_insert(struct drm_gpuva_manager *mgr, >>> + struct drm_gpuva_region *reg, >>> + u64 addr, u64 range); >>> +void drm_gpuva_region_destroy(struct drm_gpuva_manager *mgr, >>> + struct drm_gpuva_region *reg); >>> + >>> +int drm_gpuva_insert(struct drm_gpuva_manager *mgr, >>> + struct drm_gpuva *va, >>> + u64 addr, u64 range); >>> +/** >>> + * drm_gpuva_for_each_region_in_range - iternator to walk over a >>> range of nodes >>> + * @node__: &drm_gpuva_region structure to assign to in each >>> iteration step >>> + * @gpuva__: &drm_gpuva_manager structure to walk >>> + * @start__: starting offset, the first node will overlap this >>> + * @end__: ending offset, the last node will start before this (but >>> may overlap) >>> + * >>> + * This iterator walks over all nodes in the range allocator that lie >>> + * between @start and @end. It is implemented similarly to >>> list_for_each(), >>> + * but is using &drm_mm's internal interval tree to accelerate the >>> search for >>> + * the starting node, and hence isn't safe against removal of >>> elements. It >>> + * assumes that @end is within (or is the upper limit of) the >>> &drm_gpuva_manager. >>> + * If [@start, @end] are beyond the range of the &drm_gpuva_manager, >>> the >>> + * iterator may walk over the special _unallocated_ >>> &drm_mm.head_node of the >>> + * backing &drm_mm, and may even continue indefinitely. >>> + */ >>> +#define drm_gpuva_for_each_region_in_range(node__, gpuva__, start__, >>> end__) \ >>> + for (node__ = (struct drm_gpuva_region >>> *)__drm_mm_interval_first(&(gpuva__)->region_mm, \ >>> + (start__), (end__)-1); \ >>> + node__->node.start < (end__); \ >>> + node__ = (struct drm_gpuva_region >>> *)list_next_entry(&node__->node, node_list)) >>> + >>> +/** >>> + * drm_gpuva_for_each_region - iternator to walk over a range of nodes >>> + * @entry: &drm_gpuva_region structure to assign to in each >>> iteration step >>> + * @gpuva: &drm_gpuva_manager structure to walk >>> + * >>> + * This iterator walks over all &drm_gpuva_region structures >>> associated with the >>> + * &drm_gpuva_manager. >>> + */ >>> +#define drm_gpuva_for_each_region(entry, gpuva) \ >>> + list_for_each_entry(entry, drm_mm_nodes(&(gpuva)->region_mm), >>> node.node_list) >>> + >>> +/** >>> + * drm_gpuva_for_each_region_safe - iternator to safely walk over a >>> range of >>> + * nodes >>> + * @entry: &drm_gpuva_region structure to assign to in each >>> iteration step >>> + * @next: &next &drm_gpuva_region to store the next step >>> + * @gpuva: &drm_gpuva_manager structure to walk >>> + * >>> + * This iterator walks over all &drm_gpuva_region structures >>> associated with the >>> + * &drm_gpuva_manager. It is implemented with list_for_each_safe(), >>> so save >>> + * against removal of elements. >>> + */ >>> +#define drm_gpuva_for_each_region_safe(entry, next, gpuva) \ >>> + list_for_each_entry_safe(entry, next, >>> drm_mm_nodes(&(gpuva)->region_mm), node.node_list) >>> + >>> + >>> +/** >>> + * enum drm_gpuva_flags - flags for struct drm_gpuva >>> + */ >>> +enum drm_gpuva_flags { >>> + /** >>> + * @DRM_GPUVA_SWAPPED: flag indicating that the &drm_gpuva is >>> swapped >>> + */ >>> + DRM_GPUVA_SWAPPED = (1 << 0), >>> +}; >>> + >>> +/** >>> + * struct drm_gpuva - structure to track a GPU VA mapping >>> + * >>> + * This structure represents a GPU VA mapping and is associated with a >>> + * &drm_gpuva_manager. Internally it is based on a &drm_mm_node. >>> + * >>> + * Typically, this structure is embedded in bigger driver structures. >>> + */ >>> +struct drm_gpuva { >>> + /** >>> + * @node: the &drm_mm_node to track the GPU VA mapping >>> + */ >>> + struct drm_mm_node node; >>> + >>> + /** >>> + * @mgr: the &drm_gpuva_manager this object is associated with >>> + */ >>> + struct drm_gpuva_manager *mgr; >>> + >>> + /** >>> + * @region: the &drm_gpuva_region the &drm_gpuva is mapped in >>> + */ >>> + struct drm_gpuva_region *region; >>> + >>> + /** >>> + * @head: the &list_head to attach this object to a &drm_gem_object >>> + */ >>> + struct list_head head; >>> + >>> + /** >>> + * @flags: the &drm_gpuva_flags for this mapping >>> + */ >>> + enum drm_gpuva_flags flags; >>> + >>> + /** >>> + * @gem: structure containing the &drm_gem_object and it's offset >>> + */ >>> + struct { >>> + /** >>> + * @offset: the offset within the &drm_gem_object >>> + */ >>> + u64 offset; >>> + >>> + /** >>> + * @obj: the mapped &drm_gem_object >>> + */ >>> + struct drm_gem_object *obj; >>> + } gem; >>> +}; >>> + >>> +void drm_gpuva_link_locked(struct drm_gpuva *va); >>> +void drm_gpuva_link_unlocked(struct drm_gpuva *va); >>> +void drm_gpuva_unlink_locked(struct drm_gpuva *va); >>> +void drm_gpuva_unlink_unlocked(struct drm_gpuva *va); >>> + >>> +void drm_gpuva_destroy_locked(struct drm_gpuva *va); >>> +void drm_gpuva_destroy_unlocked(struct drm_gpuva *va); >>> + >>> +struct drm_gpuva *drm_gpuva_find(struct drm_gpuva_manager *mgr, >>> + u64 addr, u64 range); >>> +struct drm_gpuva *drm_gpuva_find_prev(struct drm_gpuva_manager *mgr, >>> u64 start); >>> +struct drm_gpuva *drm_gpuva_find_next(struct drm_gpuva_manager *mgr, >>> u64 end); >>> + >>> +/** >>> + * drm_gpuva_swap - sets whether the backing BO of this &drm_gpuva >>> is swapped >>> + * @va: the &drm_gpuva to set the swap flag of >>> + * @swap: indicates whether the &drm_gpuva is swapped >>> + */ >>> +static inline void drm_gpuva_swap(struct drm_gpuva *va, bool swap) >>> +{ >>> + if (swap) >>> + va->flags |= DRM_GPUVA_SWAPPED; >>> + else >>> + va->flags &= ~DRM_GPUVA_SWAPPED; >>> +} >>> + >>> +/** >>> + * drm_gpuva_swapped - indicates whether the backing BO of this >>> &drm_gpuva >>> + * is swapped >>> + * @va: the &drm_gpuva to check >>> + */ >>> +static inline bool drm_gpuva_swapped(struct drm_gpuva *va) >>> +{ >>> + return va->flags & DRM_GPUVA_SWAPPED; >>> +} >>> + >>> +/** >>> + * drm_gpuva_for_each_va_in_range - iternator to walk over a range >>> of nodes >>> + * @node__: &drm_gpuva structure to assign to in each iteration step >>> + * @gpuva__: &drm_gpuva_manager structure to walk >>> + * @start__: starting offset, the first node will overlap this >>> + * @end__: ending offset, the last node will start before this (but >>> may overlap) >>> + * >>> + * This iterator walks over all nodes in the range allocator that lie >>> + * between @start and @end. It is implemented similarly to >>> list_for_each(), >>> + * but is using &drm_mm's internal interval tree to accelerate the >>> search for >>> + * the starting node, and hence isn't safe against removal of >>> elements. It >>> + * assumes that @end is within (or is the upper limit of) the >>> &drm_gpuva_manager. >>> + * If [@start, @end] are beyond the range of the &drm_gpuva_manager, >>> the >>> + * iterator may walk over the special _unallocated_ >>> &drm_mm.head_node of the >>> + * backing &drm_mm, and may even continue indefinitely. >>> + */ >>> +#define drm_gpuva_for_each_va_in_range(node__, gpuva__, start__, >>> end__) \ >>> + for (node__ = (struct drm_gpuva >>> *)__drm_mm_interval_first(&(gpuva__)->va_mm, \ >>> + (start__), (end__)-1); \ >>> + node__->node.start < (end__); \ >>> + node__ = (struct drm_gpuva *)list_next_entry(&node__->node, >>> node_list)) >>> + >>> +/** >>> + * drm_gpuva_for_each_va - iternator to walk over a range of nodes >>> + * @entry: &drm_gpuva structure to assign to in each iteration step >>> + * @gpuva: &drm_gpuva_manager structure to walk >>> + * >>> + * This iterator walks over all &drm_gpuva structures associated >>> with the >>> + * &drm_gpuva_manager. >>> + */ >>> +#define drm_gpuva_for_each_va(entry, gpuva) \ >>> + list_for_each_entry(entry, drm_mm_nodes(&(gpuva)->va_mm), >>> node.node_list) >>> + >>> +/** >>> + * drm_gpuva_for_each_va_safe - iternator to safely walk over a >>> range of >>> + * nodes >>> + * @entry: &drm_gpuva structure to assign to in each iteration step >>> + * @next: &next &drm_gpuva to store the next step >>> + * @gpuva: &drm_gpuva_manager structure to walk >>> + * >>> + * This iterator walks over all &drm_gpuva structures associated >>> with the >>> + * &drm_gpuva_manager. It is implemented with list_for_each_safe(), >>> so save >>> + * against removal of elements. >>> + */ >>> +#define drm_gpuva_for_each_va_safe(entry, next, gpuva) \ >>> + list_for_each_entry_safe(entry, next, >>> drm_mm_nodes(&(gpuva)->va_mm), node.node_list) >>> + >>> +/** >>> + * enum drm_gpuva_op_type - GPU VA operation type >>> + * >>> + * Operations to alter the GPU VA mappings tracked by the >>> &drm_gpuva_manager >>> + * can be map, remap or unmap operations. >>> + */ >>> +enum drm_gpuva_op_type { >>> + /** >>> + * @DRM_GPUVA_OP_MAP: the map op type >>> + */ >>> + DRM_GPUVA_OP_MAP, >>> + >>> + /** >>> + * @DRM_GPUVA_OP_REMAP: the remap op type >>> + */ >>> + DRM_GPUVA_OP_REMAP, >>> + >>> + /** >>> + * @DRM_GPUVA_OP_UNMAP: the unmap op type >>> + */ >>> + DRM_GPUVA_OP_UNMAP, >>> +}; >>> + >>> +/** >>> + * struct drm_gpuva_op_map - GPU VA map operation >>> + * >>> + * This structure represents a single map operation generated by the >>> + * DRM GPU VA manager. >>> + */ >>> +struct drm_gpuva_op_map { >>> + /** >>> + * @va: structure containing address and range of a map >>> + * operation >>> + */ >>> + struct { >>> + /** >>> + * @addr: the base address of the new mapping >>> + */ >>> + u64 addr; >>> + >>> + /** >>> + * @range: the range of the new mapping >>> + */ >>> + u64 range; >>> + } va; >>> + >>> + /** >>> + * @gem: structure containing the &drm_gem_object and it's offset >>> + */ >>> + struct { >>> + /** >>> + * @offset: the offset within the &drm_gem_object >>> + */ >>> + u64 offset; >>> + >>> + /** >>> + * @obj: the &drm_gem_object to map >>> + */ >>> + struct drm_gem_object *obj; >>> + } gem; >>> +}; >>> + >>> +/** >>> + * struct drm_gpuva_op_unmap - GPU VA unmap operation >>> + * >>> + * This structure represents a single unmap operation generated by the >>> + * DRM GPU VA manager. >>> + */ >>> +struct drm_gpuva_op_unmap { >>> + /** >>> + * @va: the &drm_gpuva to unmap >>> + */ >>> + struct drm_gpuva *va; >>> + >>> + /** >>> + * @keep: >>> + * >>> + * Indicates whether this &drm_gpuva is physically contiguous >>> with the >>> + * original mapping request. >>> + * >>> + * Optionally, if &keep is set, drivers may keep the actual page >>> table >>> + * mappings for this &drm_gpuva, adding the missing page table >>> entries >>> + * only and update the &drm_gpuva_manager accordingly. >>> + */ >>> + bool keep; >>> +}; >>> + >>> +/** >>> + * struct drm_gpuva_op_remap - GPU VA remap operation >>> + * >>> + * This represents a single remap operation generated by the DRM GPU >>> VA manager. >>> + * >>> + * A remap operation is generated when an existing GPU VA mmapping >>> is split up >>> + * by inserting a new GPU VA mapping or by partially unmapping existent >>> + * mapping(s), hence it consists of a maximum of two map and one unmap >>> + * operation. >>> + * >>> + * The @unmap operation takes care of removing the original existing >>> mapping. >>> + * @prev is used to remap the preceding part, @next the subsequent >>> part. >>> + * >>> + * If either a new mapping's start address is aligned with the start >>> address >>> + * of the old mapping or the new mapping's end address is aligned >>> with the >>> + * end address of the old mapping, either @prev or @next is NULL. >>> + * >>> + * Note, the reason for a dedicated remap operation, rather than >>> arbitrary >>> + * unmap and map operations, is to give drivers the chance of >>> extracting driver >>> + * specific data for creating the new mappings from the unmap >>> operations's >>> + * &drm_gpuva structure which typically is embedded in larger driver >>> specific >>> + * structures. >>> + */ >>> +struct drm_gpuva_op_remap { >>> + /** >>> + * @prev: the preceding part of a split mapping >>> + */ >>> + struct drm_gpuva_op_map *prev; >>> + >>> + /** >>> + * @next: the subsequent part of a split mapping >>> + */ >>> + struct drm_gpuva_op_map *next; >>> + >>> + /** >>> + * @unmap: the unmap operation for the original existing mapping >>> + */ >>> + struct drm_gpuva_op_unmap *unmap; >>> +}; >>> + >>> +/** >>> + * struct drm_gpuva_op - GPU VA operation >>> + * >>> + * This structure represents a single generic operation, which can >>> be either >>> + * map, unmap or remap. >>> + * >>> + * The particular type of the operation is defined by @op. >>> + */ >>> +struct drm_gpuva_op { >>> + /** >>> + * @entry: >>> + * >>> + * The &list_head used to distribute instances of this struct >>> within >>> + * &drm_gpuva_ops. >>> + */ >>> + struct list_head entry; >>> + >>> + /** >>> + * @op: the type of the operation >>> + */ >>> + enum drm_gpuva_op_type op; >>> + >>> + union { >>> + /** >>> + * @map: the map operation >>> + */ >>> + struct drm_gpuva_op_map map; >>> + >>> + /** >>> + * @unmap: the unmap operation >>> + */ >>> + struct drm_gpuva_op_unmap unmap; >>> + >>> + /** >>> + * @remap: the remap operation >>> + */ >>> + struct drm_gpuva_op_remap remap; >>> + }; >>> +}; >>> + >>> +/** >>> + * struct drm_gpuva_ops - wraps a list of &drm_gpuva_op >>> + */ >>> +struct drm_gpuva_ops { >>> + /** >>> + * @list: the &list_head >>> + */ >>> + struct list_head list; >>> +}; >>> + >>> +/** >>> + * drm_gpuva_for_each_op - iterator to walk over all ops >>> + * @op: &drm_gpuva_op to assign in each iteration step >>> + * @ops: &drm_gpuva_ops to walk >>> + * >>> + * This iterator walks over all ops within a given list of operations. >>> + */ >>> +#define drm_gpuva_for_each_op(op, ops) list_for_each_entry(op, >>> &(ops)->list, entry) >>> + >>> +/** >>> + * drm_gpuva_for_each_op_safe - iterator to safely walk over all ops >>> + * @op: &drm_gpuva_op to assign in each iteration step >>> + * @next: &next &drm_gpuva_op to store the next step >>> + * @ops: &drm_gpuva_ops to walk >>> + * >>> + * This iterator walks over all ops within a given list of >>> operations. It is >>> + * implemented with list_for_each_safe(), so save against removal of >>> elements. >>> + */ >>> +#define drm_gpuva_for_each_op_safe(op, next, ops) \ >>> + list_for_each_entry_safe(op, next, &(ops)->list, entry) >>> + >>> +struct drm_gpuva_ops * >>> +drm_gpuva_sm_map_ops_create(struct drm_gpuva_manager *mgr, >>> + u64 addr, u64 range, >>> + struct drm_gem_object *obj, u64 offset); >>> +struct drm_gpuva_ops * >>> +drm_gpuva_sm_unmap_ops_create(struct drm_gpuva_manager *mgr, >>> + u64 addr, u64 range); >>> +void drm_gpuva_ops_free(struct drm_gpuva_ops *ops); >>> + >>> +#endif /* __DRM_GPUVA_MGR_H__ */ >>> -- >>> 2.39.0 >>> >
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