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OpenCloudOS-Kernel/drivers/gpu/drm/nouveau/nouveau_dmem.h

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drm/nouveau/dmem: device memory helpers for SVM Device memory can be use in SVM, in which case we do not have any of the existing buffer object. This commit add infrastructure to allow use of device memory without nouveau_bo. Again this is a temporary solution until a rework of GPU memory management. Signed-off-by: Jérôme Glisse <jglisse@redhat.com>
2018-07-27 05:59:13 +08:00
/*
* Copyright 2018 Red Hat Inc.
*
* 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.
*/
#ifndef __NOUVEAU_DMEM_H__
#define __NOUVEAU_DMEM_H__
#include <nvif/os.h>
struct drm_device;
struct drm_file;
struct nouveau_drm;
drm/nouveau/svm: map pages after migration When memory is migrated to the GPU, it is likely to be accessed by GPU code soon afterwards. Instead of waiting for a GPU fault, map the migrated memory into the GPU page tables with the same access permissions as the source CPU page table entries. This preserves copy on write semantics. Signed-off-by: Ralph Campbell <rcampbell@nvidia.com> Cc: Christoph Hellwig <hch@lst.de> Cc: Jason Gunthorpe <jgg@mellanox.com> Cc: "Jérôme Glisse" <jglisse@redhat.com> Cc: Ben Skeggs <bskeggs@redhat.com> Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
2020-03-04 08:13:39 +08:00
struct nouveau_svmm;
drm/nouveau/dmem: device memory helpers for SVM Device memory can be use in SVM, in which case we do not have any of the existing buffer object. This commit add infrastructure to allow use of device memory without nouveau_bo. Again this is a temporary solution until a rework of GPU memory management. Signed-off-by: Jérôme Glisse <jglisse@redhat.com>
2018-07-27 05:59:13 +08:00
struct hmm_range;
#if IS_ENABLED(CONFIG_DRM_NOUVEAU_SVM)
void nouveau_dmem_init(struct nouveau_drm *);
void nouveau_dmem_fini(struct nouveau_drm *);
void nouveau_dmem_suspend(struct nouveau_drm *);
void nouveau_dmem_resume(struct nouveau_drm *);
int nouveau_dmem_migrate_vma(struct nouveau_drm *drm,
drm/nouveau/svm: map pages after migration When memory is migrated to the GPU, it is likely to be accessed by GPU code soon afterwards. Instead of waiting for a GPU fault, map the migrated memory into the GPU page tables with the same access permissions as the source CPU page table entries. This preserves copy on write semantics. Signed-off-by: Ralph Campbell <rcampbell@nvidia.com> Cc: Christoph Hellwig <hch@lst.de> Cc: Jason Gunthorpe <jgg@mellanox.com> Cc: "Jérôme Glisse" <jglisse@redhat.com> Cc: Ben Skeggs <bskeggs@redhat.com> Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
2020-03-04 08:13:39 +08:00
struct nouveau_svmm *svmm,
drm/nouveau/dmem: device memory helpers for SVM Device memory can be use in SVM, in which case we do not have any of the existing buffer object. This commit add infrastructure to allow use of device memory without nouveau_bo. Again this is a temporary solution until a rework of GPU memory management. Signed-off-by: Jérôme Glisse <jglisse@redhat.com>
2018-07-27 05:59:13 +08:00
struct vm_area_struct *vma,
unsigned long start,
unsigned long end);
mm/hmm: remove the customizable pfn format from hmm_range_fault Presumably the intent here was that hmm_range_fault() could put the data into some HW specific format and thus avoid some work. However, nothing actually does that, and it isn't clear how anything actually could do that as hmm_range_fault() provides CPU addresses which must be DMA mapped. Perhaps there is some special HW that does not need DMA mapping, but we don't have any examples of this, and the theoretical performance win of avoiding an extra scan over the pfns array doesn't seem worth the complexity. Plus pfns needs to be scanned anyhow to sort out any DEVICE_PRIVATE pages. This version replaces the uint64_t with an usigned long containing a pfn and fixed flags. On input flags is filled with the HMM_PFN_REQ_* values, on successful output it is filled with HMM_PFN_* values, describing the state of the pages. amdgpu is simple to convert, it doesn't use snapshot and doesn't use per-page flags. nouveau uses only 16 hmm_pte entries at most (ie fits in a few cache lines), and it sweeps over its pfns array a couple of times anyhow. It also has a nasty call chain before it reaches the dma map and hardware suggesting performance isn't important: nouveau_svm_fault(): args.i.m.method = NVIF_VMM_V0_PFNMAP nouveau_range_fault() nvif_object_ioctl() client->driver->ioctl() struct nvif_driver nvif_driver_nvkm: .ioctl = nvkm_client_ioctl nvkm_ioctl() nvkm_ioctl_path() nvkm_ioctl_v0[type].func(..) nvkm_ioctl_mthd() nvkm_object_mthd() struct nvkm_object_func nvkm_uvmm: .mthd = nvkm_uvmm_mthd nvkm_uvmm_mthd() nvkm_uvmm_mthd_pfnmap() nvkm_vmm_pfn_map() nvkm_vmm_ptes_get_map() func == gp100_vmm_pgt_pfn struct nvkm_vmm_desc_func gp100_vmm_desc_spt: .pfn = gp100_vmm_pgt_pfn nvkm_vmm_iter() REF_PTES == func == gp100_vmm_pgt_pfn() dma_map_page() Link: https://lore.kernel.org/r/5-v2-b4e84f444c7d+24f57-hmm_no_flags_jgg@mellanox.com Acked-by: Felix Kuehling <Felix.Kuehling@amd.com> Tested-by: Ralph Campbell <rcampbell@nvidia.com> Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
2020-05-02 02:20:48 +08:00
unsigned long nouveau_dmem_page_addr(struct page *page);
drm/nouveau/dmem: device memory helpers for SVM Device memory can be use in SVM, in which case we do not have any of the existing buffer object. This commit add infrastructure to allow use of device memory without nouveau_bo. Again this is a temporary solution until a rework of GPU memory management. Signed-off-by: Jérôme Glisse <jglisse@redhat.com>
2018-07-27 05:59:13 +08:00
#else /* IS_ENABLED(CONFIG_DRM_NOUVEAU_SVM) */
static inline void nouveau_dmem_init(struct nouveau_drm *drm) {}
static inline void nouveau_dmem_fini(struct nouveau_drm *drm) {}
static inline void nouveau_dmem_suspend(struct nouveau_drm *drm) {}
static inline void nouveau_dmem_resume(struct nouveau_drm *drm) {}
#endif /* IS_ENABLED(CONFIG_DRM_NOUVEAU_SVM) */
#endif