diff options
Diffstat (limited to 'drivers/gpu/drm/nouveau/nouveau_dmem.c')
| -rw-r--r-- | drivers/gpu/drm/nouveau/nouveau_dmem.c | 887 |
1 files changed, 887 insertions, 0 deletions
diff --git a/drivers/gpu/drm/nouveau/nouveau_dmem.c b/drivers/gpu/drm/nouveau/nouveau_dmem.c new file mode 100644 index 000000000000..8be7a83ced9b --- /dev/null +++ b/drivers/gpu/drm/nouveau/nouveau_dmem.c @@ -0,0 +1,887 @@ +/* + * 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. + */ +#include "nouveau_dmem.h" +#include "nouveau_drv.h" +#include "nouveau_chan.h" +#include "nouveau_dma.h" +#include "nouveau_mem.h" +#include "nouveau_bo.h" + +#include <nvif/class.h> +#include <nvif/object.h> +#include <nvif/if500b.h> +#include <nvif/if900b.h> + +#include <linux/sched/mm.h> +#include <linux/hmm.h> + +/* + * FIXME: this is ugly right now we are using TTM to allocate vram and we pin + * it in vram while in use. We likely want to overhaul memory management for + * nouveau to be more page like (not necessarily with system page size but a + * bigger page size) at lowest level and have some shim layer on top that would + * provide the same functionality as TTM. + */ +#define DMEM_CHUNK_SIZE (2UL << 20) +#define DMEM_CHUNK_NPAGES (DMEM_CHUNK_SIZE >> PAGE_SHIFT) + +struct nouveau_migrate; + +enum nouveau_aper { + NOUVEAU_APER_VIRT, + NOUVEAU_APER_VRAM, + NOUVEAU_APER_HOST, +}; + +typedef int (*nouveau_migrate_copy_t)(struct nouveau_drm *drm, u64 npages, + enum nouveau_aper, u64 dst_addr, + enum nouveau_aper, u64 src_addr); + +struct nouveau_dmem_chunk { + struct list_head list; + struct nouveau_bo *bo; + struct nouveau_drm *drm; + unsigned long pfn_first; + unsigned long callocated; + unsigned long bitmap[BITS_TO_LONGS(DMEM_CHUNK_NPAGES)]; + spinlock_t lock; +}; + +struct nouveau_dmem_migrate { + nouveau_migrate_copy_t copy_func; + struct nouveau_channel *chan; +}; + +struct nouveau_dmem { + struct hmm_devmem *devmem; + struct nouveau_dmem_migrate migrate; + struct list_head chunk_free; + struct list_head chunk_full; + struct list_head chunk_empty; + struct mutex mutex; +}; + +struct nouveau_dmem_fault { + struct nouveau_drm *drm; + struct nouveau_fence *fence; + dma_addr_t *dma; + unsigned long npages; +}; + +struct nouveau_migrate { + struct vm_area_struct *vma; + struct nouveau_drm *drm; + struct nouveau_fence *fence; + unsigned long npages; + dma_addr_t *dma; + unsigned long dma_nr; +}; + +static void +nouveau_dmem_free(struct hmm_devmem *devmem, struct page *page) +{ + struct nouveau_dmem_chunk *chunk; + struct nouveau_drm *drm; + unsigned long idx; + + chunk = (void *)hmm_devmem_page_get_drvdata(page); + idx = page_to_pfn(page) - chunk->pfn_first; + drm = chunk->drm; + + /* + * FIXME: + * + * This is really a bad example, we need to overhaul nouveau memory + * management to be more page focus and allow lighter locking scheme + * to be use in the process. + */ + spin_lock(&chunk->lock); + clear_bit(idx, chunk->bitmap); + WARN_ON(!chunk->callocated); + chunk->callocated--; + /* + * FIXME when chunk->callocated reach 0 we should add the chunk to + * a reclaim list so that it can be freed in case of memory pressure. + */ + spin_unlock(&chunk->lock); +} + +static void +nouveau_dmem_fault_alloc_and_copy(struct vm_area_struct *vma, + const unsigned long *src_pfns, + unsigned long *dst_pfns, + unsigned long start, + unsigned long end, + void *private) +{ + struct nouveau_dmem_fault *fault = private; + struct nouveau_drm *drm = fault->drm; + struct device *dev = drm->dev->dev; + unsigned long addr, i, npages = 0; + nouveau_migrate_copy_t copy; + int ret; + + + /* First allocate new memory */ + for (addr = start, i = 0; addr < end; addr += PAGE_SIZE, i++) { + struct page *dpage, *spage; + + dst_pfns[i] = 0; + spage = migrate_pfn_to_page(src_pfns[i]); + if (!spage || !(src_pfns[i] & MIGRATE_PFN_MIGRATE)) + continue; + + dpage = hmm_vma_alloc_locked_page(vma, addr); + if (!dpage) { + dst_pfns[i] = MIGRATE_PFN_ERROR; + continue; + } + + dst_pfns[i] = migrate_pfn(page_to_pfn(dpage)) | + MIGRATE_PFN_LOCKED; + npages++; + } + + /* Allocate storage for DMA addresses, so we can unmap later. */ + fault->dma = kmalloc(sizeof(*fault->dma) * npages, GFP_KERNEL); + if (!fault->dma) + goto error; + + /* Copy things over */ + copy = drm->dmem->migrate.copy_func; + for (addr = start, i = 0; addr < end; addr += PAGE_SIZE, i++) { + struct nouveau_dmem_chunk *chunk; + struct page *spage, *dpage; + u64 src_addr, dst_addr; + + dpage = migrate_pfn_to_page(dst_pfns[i]); + if (!dpage || dst_pfns[i] == MIGRATE_PFN_ERROR) + continue; + + spage = migrate_pfn_to_page(src_pfns[i]); + if (!spage || !(src_pfns[i] & MIGRATE_PFN_MIGRATE)) { + dst_pfns[i] = MIGRATE_PFN_ERROR; + __free_page(dpage); + continue; + } + + fault->dma[fault->npages] = + dma_map_page_attrs(dev, dpage, 0, PAGE_SIZE, + PCI_DMA_BIDIRECTIONAL, + DMA_ATTR_SKIP_CPU_SYNC); + if (dma_mapping_error(dev, fault->dma[fault->npages])) { + dst_pfns[i] = MIGRATE_PFN_ERROR; + __free_page(dpage); + continue; + } + + dst_addr = fault->dma[fault->npages++]; + + chunk = (void *)hmm_devmem_page_get_drvdata(spage); + src_addr = page_to_pfn(spage) - chunk->pfn_first; + src_addr = (src_addr << PAGE_SHIFT) + chunk->bo->bo.offset; + + ret = copy(drm, 1, NOUVEAU_APER_HOST, dst_addr, + NOUVEAU_APER_VRAM, src_addr); + if (ret) { + dst_pfns[i] = MIGRATE_PFN_ERROR; + __free_page(dpage); + continue; + } + } + + nouveau_fence_new(drm->dmem->migrate.chan, false, &fault->fence); + + return; + +error: + for (addr = start, i = 0; addr < end; addr += PAGE_SIZE, ++i) { + struct page *page; + + if (!dst_pfns[i] || dst_pfns[i] == MIGRATE_PFN_ERROR) + continue; + + page = migrate_pfn_to_page(dst_pfns[i]); + dst_pfns[i] = MIGRATE_PFN_ERROR; + if (page == NULL) + continue; + + __free_page(page); + } +} + +void nouveau_dmem_fault_finalize_and_map(struct vm_area_struct *vma, + const unsigned long *src_pfns, + const unsigned long *dst_pfns, + unsigned long start, + unsigned long end, + void *private) +{ + struct nouveau_dmem_fault *fault = private; + struct nouveau_drm *drm = fault->drm; + + if (fault->fence) { + nouveau_fence_wait(fault->fence, true, false); + nouveau_fence_unref(&fault->fence); + } else { + /* + * FIXME wait for channel to be IDLE before calling finalizing + * the hmem object below (nouveau_migrate_hmem_fini()). + */ + } + + while (fault->npages--) { + dma_unmap_page(drm->dev->dev, fault->dma[fault->npages], + PAGE_SIZE, PCI_DMA_BIDIRECTIONAL); + } + kfree(fault->dma); +} + +static const struct migrate_vma_ops nouveau_dmem_fault_migrate_ops = { + .alloc_and_copy = nouveau_dmem_fault_alloc_and_copy, + .finalize_and_map = nouveau_dmem_fault_finalize_and_map, +}; + +static int +nouveau_dmem_fault(struct hmm_devmem *devmem, + struct vm_area_struct *vma, + unsigned long addr, + const struct page *page, + unsigned int flags, + pmd_t *pmdp) +{ + struct drm_device *drm_dev = dev_get_drvdata(devmem->device); + unsigned long src[1] = {0}, dst[1] = {0}; + struct nouveau_dmem_fault fault = {0}; + int ret; + + + + /* + * FIXME what we really want is to find some heuristic to migrate more + * than just one page on CPU fault. When such fault happens it is very + * likely that more surrounding page will CPU fault too. + */ + fault.drm = nouveau_drm(drm_dev); + ret = migrate_vma(&nouveau_dmem_fault_migrate_ops, vma, addr, + addr + PAGE_SIZE, src, dst, &fault); + if (ret) + return VM_FAULT_SIGBUS; + + if (dst[0] == MIGRATE_PFN_ERROR) + return VM_FAULT_SIGBUS; + + return 0; +} + +static const struct hmm_devmem_ops +nouveau_dmem_devmem_ops = { + .free = nouveau_dmem_free, + .fault = nouveau_dmem_fault, +}; + +static int +nouveau_dmem_chunk_alloc(struct nouveau_drm *drm) +{ + struct nouveau_dmem_chunk *chunk; + int ret; + + if (drm->dmem == NULL) + return -EINVAL; + + mutex_lock(&drm->dmem->mutex); + chunk = list_first_entry_or_null(&drm->dmem->chunk_empty, + struct nouveau_dmem_chunk, + list); + if (chunk == NULL) { + mutex_unlock(&drm->dmem->mutex); + return -ENOMEM; + } + + list_del(&chunk->list); + mutex_unlock(&drm->dmem->mutex); + + ret = nouveau_bo_new(&drm->client, DMEM_CHUNK_SIZE, 0, + TTM_PL_FLAG_VRAM, 0, 0, NULL, NULL, + &chunk->bo); + if (ret) + goto out; + + ret = nouveau_bo_pin(chunk->bo, TTM_PL_FLAG_VRAM, false); + if (ret) { + nouveau_bo_ref(NULL, &chunk->bo); + goto out; + } + + bitmap_zero(chunk->bitmap, DMEM_CHUNK_NPAGES); + spin_lock_init(&chunk->lock); + +out: + mutex_lock(&drm->dmem->mutex); + if (chunk->bo) + list_add(&chunk->list, &drm->dmem->chunk_empty); + else + list_add_tail(&chunk->list, &drm->dmem->chunk_empty); + mutex_unlock(&drm->dmem->mutex); + + return ret; +} + +static struct nouveau_dmem_chunk * +nouveau_dmem_chunk_first_free_locked(struct nouveau_drm *drm) +{ + struct nouveau_dmem_chunk *chunk; + + chunk = list_first_entry_or_null(&drm->dmem->chunk_free, + struct nouveau_dmem_chunk, + list); + if (chunk) + return chunk; + + chunk = list_first_entry_or_null(&drm->dmem->chunk_empty, + struct nouveau_dmem_chunk, + list); + if (chunk->bo) + return chunk; + + return NULL; +} + +static int +nouveau_dmem_pages_alloc(struct nouveau_drm *drm, + unsigned long npages, + unsigned long *pages) +{ + struct nouveau_dmem_chunk *chunk; + unsigned long c; + int ret; + + memset(pages, 0xff, npages * sizeof(*pages)); + + mutex_lock(&drm->dmem->mutex); + for (c = 0; c < npages;) { + unsigned long i; + + chunk = nouveau_dmem_chunk_first_free_locked(drm); + if (chunk == NULL) { + mutex_unlock(&drm->dmem->mutex); + ret = nouveau_dmem_chunk_alloc(drm); + if (ret) { + if (c) + break; + return ret; + } + continue; + } + + spin_lock(&chunk->lock); + i = find_first_zero_bit(chunk->bitmap, DMEM_CHUNK_NPAGES); + while (i < DMEM_CHUNK_NPAGES && c < npages) { + pages[c] = chunk->pfn_first + i; + set_bit(i, chunk->bitmap); + chunk->callocated++; + c++; + + i = find_next_zero_bit(chunk->bitmap, + DMEM_CHUNK_NPAGES, i); + } + spin_unlock(&chunk->lock); + } + mutex_unlock(&drm->dmem->mutex); + + return 0; +} + +static struct page * +nouveau_dmem_page_alloc_locked(struct nouveau_drm *drm) +{ + unsigned long pfns[1]; + struct page *page; + int ret; + + /* FIXME stop all the miss-match API ... */ + ret = nouveau_dmem_pages_alloc(drm, 1, pfns); + if (ret) + return NULL; + + page = pfn_to_page(pfns[0]); + get_page(page); + lock_page(page); + return page; +} + +static void +nouveau_dmem_page_free_locked(struct nouveau_drm *drm, struct page *page) +{ + unlock_page(page); + put_page(page); +} + +void +nouveau_dmem_resume(struct nouveau_drm *drm) +{ + struct nouveau_dmem_chunk *chunk; + int ret; + + if (drm->dmem == NULL) + return; + + mutex_lock(&drm->dmem->mutex); + list_for_each_entry (chunk, &drm->dmem->chunk_free, list) { + ret = nouveau_bo_pin(chunk->bo, TTM_PL_FLAG_VRAM, false); + /* FIXME handle pin failure */ + WARN_ON(ret); + } + list_for_each_entry (chunk, &drm->dmem->chunk_full, list) { + ret = nouveau_bo_pin(chunk->bo, TTM_PL_FLAG_VRAM, false); + /* FIXME handle pin failure */ + WARN_ON(ret); + } + list_for_each_entry (chunk, &drm->dmem->chunk_empty, list) { + ret = nouveau_bo_pin(chunk->bo, TTM_PL_FLAG_VRAM, false); + /* FIXME handle pin failure */ + WARN_ON(ret); + } + mutex_unlock(&drm->dmem->mutex); +} + +void +nouveau_dmem_suspend(struct nouveau_drm *drm) +{ + struct nouveau_dmem_chunk *chunk; + + if (drm->dmem == NULL) + return; + + mutex_lock(&drm->dmem->mutex); + list_for_each_entry (chunk, &drm->dmem->chunk_free, list) { + nouveau_bo_unpin(chunk->bo); + } + list_for_each_entry (chunk, &drm->dmem->chunk_full, list) { + nouveau_bo_unpin(chunk->bo); + } + list_for_each_entry (chunk, &drm->dmem->chunk_empty, list) { + nouveau_bo_unpin(chunk->bo); + } + mutex_unlock(&drm->dmem->mutex); +} + +void +nouveau_dmem_fini(struct nouveau_drm *drm) +{ + struct nouveau_dmem_chunk *chunk, *tmp; + + if (drm->dmem == NULL) + return; + + mutex_lock(&drm->dmem->mutex); + + WARN_ON(!list_empty(&drm->dmem->chunk_free)); + WARN_ON(!list_empty(&drm->dmem->chunk_full)); + + list_for_each_entry_safe (chunk, tmp, &drm->dmem->chunk_empty, list) { + if (chunk->bo) { + nouveau_bo_unpin(chunk->bo); + nouveau_bo_ref(NULL, &chunk->bo); + } + list_del(&chunk->list); + kfree(chunk); + } + + mutex_unlock(&drm->dmem->mutex); +} + +static int +nvc0b5_migrate_copy(struct nouveau_drm *drm, u64 npages, + enum nouveau_aper dst_aper, u64 dst_addr, + enum nouveau_aper src_aper, u64 src_addr) +{ + struct nouveau_channel *chan = drm->dmem->migrate.chan; + u32 launch_dma = (1 << 9) /* MULTI_LINE_ENABLE. */ | + (1 << 8) /* DST_MEMORY_LAYOUT_PITCH. */ | + (1 << 7) /* SRC_MEMORY_LAYOUT_PITCH. */ | + (1 << 2) /* FLUSH_ENABLE_TRUE. */ | + (2 << 0) /* DATA_TRANSFER_TYPE_NON_PIPELINED. */; + int ret; + + ret = RING_SPACE(chan, 13); + if (ret) + return ret; + + if (src_aper != NOUVEAU_APER_VIRT) { + switch (src_aper) { + case NOUVEAU_APER_VRAM: + BEGIN_IMC0(chan, NvSubCopy, 0x0260, 0); + break; + case NOUVEAU_APER_HOST: + BEGIN_IMC0(chan, NvSubCopy, 0x0260, 1); + break; + default: + return -EINVAL; + } + launch_dma |= 0x00001000; /* SRC_TYPE_PHYSICAL. */ + } + + if (dst_aper != NOUVEAU_APER_VIRT) { + switch (dst_aper) { + case NOUVEAU_APER_VRAM: + BEGIN_IMC0(chan, NvSubCopy, 0x0264, 0); + break; + case NOUVEAU_APER_HOST: + BEGIN_IMC0(chan, NvSubCopy, 0x0264, 1); + break; + default: + return -EINVAL; + } + launch_dma |= 0x00002000; /* DST_TYPE_PHYSICAL. */ + } + + BEGIN_NVC0(chan, NvSubCopy, 0x0400, 8); + OUT_RING (chan, upper_32_bits(src_addr)); + OUT_RING (chan, lower_32_bits(src_addr)); + OUT_RING (chan, upper_32_bits(dst_addr)); + OUT_RING (chan, lower_32_bits(dst_addr)); + OUT_RING (chan, PAGE_SIZE); + OUT_RING (chan, PAGE_SIZE); + OUT_RING (chan, PAGE_SIZE); + OUT_RING (chan, npages); + BEGIN_NVC0(chan, NvSubCopy, 0x0300, 1); + OUT_RING (chan, launch_dma); + return 0; +} + +static int +nouveau_dmem_migrate_init(struct nouveau_drm *drm) +{ + switch (drm->ttm.copy.oclass) { + case PASCAL_DMA_COPY_A: + case PASCAL_DMA_COPY_B: + case VOLTA_DMA_COPY_A: + case TURING_DMA_COPY_A: + drm->dmem->migrate.copy_func = nvc0b5_migrate_copy; + drm->dmem->migrate.chan = drm->ttm.chan; + return 0; + default: + break; + } + return -ENODEV; +} + +void +nouveau_dmem_init(struct nouveau_drm *drm) +{ + struct device *device = drm->dev->dev; + unsigned long i, size; + int ret; + + /* This only make sense on PASCAL or newer */ + if (drm->client.device.info.family < NV_DEVICE_INFO_V0_PASCAL) + return; + + if (!(drm->dmem = kzalloc(sizeof(*drm->dmem), GFP_KERNEL))) + return; + + mutex_init(&drm->dmem->mutex); + INIT_LIST_HEAD(&drm->dmem->chunk_free); + INIT_LIST_HEAD(&drm->dmem->chunk_full); + INIT_LIST_HEAD(&drm->dmem->chunk_empty); + + size = ALIGN(drm->client.device.info.ram_user, DMEM_CHUNK_SIZE); + + /* Initialize migration dma helpers before registering memory */ + ret = nouveau_dmem_migrate_init(drm); + if (ret) { + kfree(drm->dmem); + drm->dmem = NULL; + return; + } + + /* + * FIXME we need some kind of policy to decide how much VRAM we + * want to register with HMM. For now just register everything + * and latter if we want to do thing like over commit then we + * could revisit this. + */ + drm->dmem->devmem = hmm_devmem_add(&nouveau_dmem_devmem_ops, + device, size); + if (drm->dmem->devmem == NULL) { + kfree(drm->dmem); + drm->dmem = NULL; + return; + } + + for (i = 0; i < (size / DMEM_CHUNK_SIZE); ++i) { + struct nouveau_dmem_chunk *chunk; + struct page *page; + unsigned long j; + + chunk = kzalloc(sizeof(*chunk), GFP_KERNEL); + if (chunk == NULL) { + nouveau_dmem_fini(drm); + return; + } + + chunk->drm = drm; + chunk->pfn_first = drm->dmem->devmem->pfn_first; + chunk->pfn_first += (i * DMEM_CHUNK_NPAGES); + list_add_tail(&chunk->list, &drm->dmem->chunk_empty); + + page = pfn_to_page(chunk->pfn_first); + for (j = 0; j < DMEM_CHUNK_NPAGES; ++j, ++page) { + hmm_devmem_page_set_drvdata(page, (long)chunk); + } + } + + NV_INFO(drm, "DMEM: registered %ldMB of device memory\n", size >> 20); +} + +static void +nouveau_dmem_migrate_alloc_and_copy(struct vm_area_struct *vma, + const unsigned long *src_pfns, + unsigned long *dst_pfns, + unsigned long start, + unsigned long end, + void *private) +{ + struct nouveau_migrate *migrate = private; + struct nouveau_drm *drm = migrate->drm; + struct device *dev = drm->dev->dev; + unsigned long addr, i, npages = 0; + nouveau_migrate_copy_t copy; + int ret; + + /* First allocate new memory */ + for (addr = start, i = 0; addr < end; addr += PAGE_SIZE, i++) { + struct page *dpage, *spage; + + dst_pfns[i] = 0; + spage = migrate_pfn_to_page(src_pfns[i]); + if (!spage || !(src_pfns[i] & MIGRATE_PFN_MIGRATE)) + continue; + + dpage = nouveau_dmem_page_alloc_locked(drm); + if (!dpage) + continue; + + dst_pfns[i] = migrate_pfn(page_to_pfn(dpage)) | + MIGRATE_PFN_LOCKED | + MIGRATE_PFN_DEVICE; + npages++; + } + + if (!npages) + return; + + /* Allocate storage for DMA addresses, so we can unmap later. */ + migrate->dma = kmalloc(sizeof(*migrate->dma) * npages, GFP_KERNEL); + if (!migrate->dma) + goto error; + + /* Copy things over */ + copy = drm->dmem->migrate.copy_func; + for (addr = start, i = 0; addr < end; addr += PAGE_SIZE, i++) { + struct nouveau_dmem_chunk *chunk; + struct page *spage, *dpage; + u64 src_addr, dst_addr; + + dpage = migrate_pfn_to_page(dst_pfns[i]); + if (!dpage || dst_pfns[i] == MIGRATE_PFN_ERROR) + continue; + + chunk = (void *)hmm_devmem_page_get_drvdata(dpage); + dst_addr = page_to_pfn(dpage) - chunk->pfn_first; + dst_addr = (dst_addr << PAGE_SHIFT) + chunk->bo->bo.offset; + + spage = migrate_pfn_to_page(src_pfns[i]); + if (!spage || !(src_pfns[i] & MIGRATE_PFN_MIGRATE)) { + nouveau_dmem_page_free_locked(drm, dpage); + dst_pfns[i] = 0; + continue; + } + + migrate->dma[migrate->dma_nr] = + dma_map_page_attrs(dev, spage, 0, PAGE_SIZE, + PCI_DMA_BIDIRECTIONAL, + DMA_ATTR_SKIP_CPU_SYNC); + if (dma_mapping_error(dev, migrate->dma[migrate->dma_nr])) { + nouveau_dmem_page_free_locked(drm, dpage); + dst_pfns[i] = 0; + continue; + } + + src_addr = migrate->dma[migrate->dma_nr++]; + + ret = copy(drm, 1, NOUVEAU_APER_VRAM, dst_addr, + NOUVEAU_APER_HOST, src_addr); + if (ret) { + nouveau_dmem_page_free_locked(drm, dpage); + dst_pfns[i] = 0; + continue; + } + } + + nouveau_fence_new(drm->dmem->migrate.chan, false, &migrate->fence); + + return; + +error: + for (addr = start, i = 0; addr < end; addr += PAGE_SIZE, ++i) { + struct page *page; + + if (!dst_pfns[i] || dst_pfns[i] == MIGRATE_PFN_ERROR) + continue; + + page = migrate_pfn_to_page(dst_pfns[i]); + dst_pfns[i] = MIGRATE_PFN_ERROR; + if (page == NULL) + continue; + + __free_page(page); + } +} + +void nouveau_dmem_migrate_finalize_and_map(struct vm_area_struct *vma, + const unsigned long *src_pfns, + const unsigned long *dst_pfns, + unsigned long start, + unsigned long end, + void *private) +{ + struct nouveau_migrate *migrate = private; + struct nouveau_drm *drm = migrate->drm; + + if (migrate->fence) { + nouveau_fence_wait(migrate->fence, true, false); + nouveau_fence_unref(&migrate->fence); + } else { + /* + * FIXME wait for channel to be IDLE before finalizing + * the hmem object below (nouveau_migrate_hmem_fini()) ? + */ + } + + while (migrate->dma_nr--) { + dma_unmap_page(drm->dev->dev, migrate->dma[migrate->dma_nr], + PAGE_SIZE, PCI_DMA_BIDIRECTIONAL); + } + kfree(migrate->dma); + + /* + * FIXME optimization: update GPU page table to point to newly + * migrated memory. + */ +} + +static const struct migrate_vma_ops nouveau_dmem_migrate_ops = { + .alloc_and_copy = nouveau_dmem_migrate_alloc_and_copy, + .finalize_and_map = nouveau_dmem_migrate_finalize_and_map, +}; + +int +nouveau_dmem_migrate_vma(struct nouveau_drm *drm, + struct vm_area_struct *vma, + unsigned long start, + unsigned long end) +{ + unsigned long *src_pfns, *dst_pfns, npages; + struct nouveau_migrate migrate = {0}; + unsigned long i, c, max; + int ret = 0; + + npages = (end - start) >> PAGE_SHIFT; + max = min(SG_MAX_SINGLE_ALLOC, npages); + src_pfns = kzalloc(sizeof(long) * max, GFP_KERNEL); + if (src_pfns == NULL) + return -ENOMEM; + dst_pfns = kzalloc(sizeof(long) * max, GFP_KERNEL); + if (dst_pfns == NULL) { + kfree(src_pfns); + return -ENOMEM; + } + + migrate.drm = drm; + migrate.vma = vma; + migrate.npages = npages; + for (i = 0; i < npages; i += c) { + unsigned long next; + + c = min(SG_MAX_SINGLE_ALLOC, npages); + next = start + (c << PAGE_SHIFT); + ret = migrate_vma(&nouveau_dmem_migrate_ops, vma, start, + next, src_pfns, dst_pfns, &migrate); + if (ret) + goto out; + start = next; + } + +out: + kfree(dst_pfns); + kfree(src_pfns); + return ret; +} + +static inline bool +nouveau_dmem_page(struct nouveau_drm *drm, struct page *page) +{ + if (!is_device_private_page(page)) + return false; + + if (drm->dmem->devmem != page->pgmap->data) + return false; + + return true; +} + +void +nouveau_dmem_convert_pfn(struct nouveau_drm *drm, + struct hmm_range *range) +{ + unsigned long i, npages; + + npages = (range->end - range->start) >> PAGE_SHIFT; + for (i = 0; i < npages; ++i) { + struct nouveau_dmem_chunk *chunk; + struct page *page; + uint64_t addr; + + page = hmm_pfn_to_page(range, range->pfns[i]); + if (page == NULL) + continue; + + if (!(range->pfns[i] & range->flags[HMM_PFN_DEVICE_PRIVATE])) { + continue; + } + + if (!nouveau_dmem_page(drm, page)) { + WARN(1, "Some unknown device memory !\n"); + range->pfns[i] = 0; + continue; + } + + chunk = (void *)hmm_devmem_page_get_drvdata(page); + addr = page_to_pfn(page) - chunk->pfn_first; + addr = (addr + chunk->bo->bo.mem.start) << PAGE_SHIFT; + + range->pfns[i] &= ((1UL << range->pfn_shift) - 1); + range->pfns[i] |= (addr >> PAGE_SHIFT) << range->pfn_shift; + } +} |