[PATCH 4/5] nouveau/svm: use the new migration invalidation

Ralph Campbell
2020-07-06T22:24:12Z

Use the new MMU_NOTIFY_MIGRATE event to skip GPU MMU invalidations of
device private memory and handle the invalidation in the driver as part
of migrating device private memory.

Signed-off-by: Ralph Campbell <rcampbell@nvidia.com>
---
drivers/gpu/drm/nouveau/nouveau_dmem.c | 11 ++++++++---
drivers/gpu/drm/nouveau/nouveau_svm.c | 10 +++++++++-
drivers/gpu/drm/nouveau/nouveau_svm.h | 1 +
3 files changed, 18 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/nouveau/nouveau_dmem.c b/drivers/gpu/drm/nouveau/nouveau_dmem.c
index 762e0168bc8d..da793e301c0c 100644
--- a/drivers/gpu/drm/nouveau/nouveau_dmem.c
+++ b/drivers/gpu/drm/nouveau/nouveau_dmem.c
@@ -154,6 +154,8 @@ static vm_fault_t nouveau_dmem_fault_copy_one(struct nouveau_drm *drm,
if (dma_mapping_error(dev, *dma_addr))
goto error_free_page;

+ nouveau_svmm_invalidate(spage->zone_device_data, args->start,
+ args->end);
if (drm->dmem->migrate.copy_func(drm, 1, NOUVEAU_APER_HOST, *dma_addr,
NOUVEAU_APER_VRAM, nouveau_dmem_page_addr(spage)))
goto error_dma_unmap;
@@ -531,7 +533,8 @@ nouveau_dmem_init(struct nouveau_drm *drm)
}

static unsigned long nouveau_dmem_migrate_copy_one(struct nouveau_drm *drm,
- unsigned long src, dma_addr_t *dma_addr, u64 *pfn)
+ struct nouveau_svmm *svmm, unsigned long src,
+ dma_addr_t *dma_addr, u64 *pfn)
{
struct device *dev = drm->dev->dev;
struct page *dpage, *spage;
@@ -561,6 +564,7 @@ static unsigned long nouveau_dmem_migrate_copy_one(struct nouveau_drm *drm,
goto out_free_page;
}

+ dpage->zone_device_data = svmm;
*pfn = NVIF_VMM_PFNMAP_V0_V | NVIF_VMM_PFNMAP_V0_VRAM |
((paddr >> PAGE_SHIFT) << NVIF_VMM_PFNMAP_V0_ADDR_SHIFT);
if (src & MIGRATE_PFN_WRITE)
@@ -584,8 +588,8 @@ static void nouveau_dmem_migrate_chunk(struct nouveau_drm *drm,
unsigned long addr = args->start, nr_dma = 0, i;

for (i = 0; addr < args->end; i++) {
- args->dst[i] = nouveau_dmem_migrate_copy_one(drm, args->src[i],
- dma_addrs + nr_dma, pfns + i);
+ args->dst[i] = nouveau_dmem_migrate_copy_one(drm, svmm,
+ args->src[i], dma_addrs + nr_dma, pfns + i);
if (!dma_mapping_error(drm->dev->dev, dma_addrs[nr_dma]))
nr_dma++;
addr += PAGE_SIZE;
@@ -616,6 +620,7 @@ nouveau_dmem_migrate_vma(struct nouveau_drm *drm,
struct migrate_vma args = {
.vma = vma,
.start = start,
+ .src_owner = drm->dev,
.dir = MIGRATE_VMA_FROM_SYSTEM,
};
unsigned long i;
diff --git a/drivers/gpu/drm/nouveau/nouveau_svm.c b/drivers/gpu/drm/nouveau/nouveau_svm.c
index 9dd296d3c378..ccfd4304d737 100644
--- a/drivers/gpu/drm/nouveau/nouveau_svm.c
+++ b/drivers/gpu/drm/nouveau/nouveau_svm.c
@@ -246,7 +246,7 @@ nouveau_svmm_join(struct nouveau_svmm *svmm, u64 inst)
}

/* Invalidate SVMM address-range on GPU. */
-static void
+void
nouveau_svmm_invalidate(struct nouveau_svmm *svmm, u64 start, u64 limit)
{
if (limit > start) {
@@ -279,6 +279,14 @@ nouveau_svmm_invalidate_range_start(struct mmu_notifier *mn,
if (unlikely(!svmm->vmm))
goto out;

+ /*
+ * Ignore invalidation callbacks for device private pages since
+ * the invalidation is handled as part of the migration process.
+ */
+ if (update->event == MMU_NOTIFY_MIGRATE &&
+ update->data == svmm->vmm->cli->drm->dev)
+ goto out;
+
if (limit > svmm->unmanaged.start && start < svmm->unmanaged.limit) {
if (start < svmm->unmanaged.start) {
nouveau_svmm_invalidate(svmm, start,
diff --git a/drivers/gpu/drm/nouveau/nouveau_svm.h b/drivers/gpu/drm/nouveau/nouveau_svm.h
index f0fcd1b72e8b..bb2d56e50e0c 100644
--- a/drivers/gpu/drm/nouveau/nouveau_svm.h
+++ b/drivers/gpu/drm/nouveau/nouveau_svm.h
@@ -19,6 +19,7 @@ int nouveau_svmm_join(struct nouveau_svmm *, u64 inst);
void nouveau_svmm_part(struct nouveau_svmm *, u64 inst);
int nouveau_svmm_bind(struct drm_device *, void *, struct drm_file *);

+void nouveau_svmm_invalidate(struct nouveau_svmm *svmm, u64 start, u64 limit);
u64 *nouveau_pfns_alloc(unsigned long npages);
void nouveau_pfns_free(u64 *pfns);
void nouveau_pfns_map(struct nouveau_svmm *svmm, struct mm_struct *mm,
--
2.20.1