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nouveau/svm: use the new migration invalidation

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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.

Link: https://lore.kernel.org/r/20200723223004.9586-5-rcampbell@nvidia.com
Signed-off-by: Ralph Campbell <rcampbell@nvidia.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
This commit is contained in:
Ralph Campbell 2020-07-23 15:30:02 -07:00 committed by Jason Gunthorpe
parent 998427b3ad
commit f8477ce6b5
3 changed files with 33 additions and 16 deletions
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15
drivers/gpu/drm/nouveau/nouveau_dmem.c
View File

@ -140,6 +140,7 @@ static vm_fault_t nouveau_dmem_fault_copy_one(struct nouveau_drm *drm,
{
struct device *dev = drm->dev->dev;
struct page *dpage, *spage;
struct nouveau_svmm *svmm;
spage = migrate_pfn_to_page(args->src[0]);
if (!spage || !(args->src[0] & MIGRATE_PFN_MIGRATE))
@ -154,14 +155,19 @@ static vm_fault_t nouveau_dmem_fault_copy_one(struct nouveau_drm *drm,
if (dma_mapping_error(dev, *dma_addr))
goto error_free_page;
svmm = spage->zone_device_data;
mutex_lock(&svmm->mutex);
nouveau_svmm_invalidate(svmm, 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;
mutex_unlock(&svmm->mutex);
args->dst[0] = migrate_pfn(page_to_pfn(dpage)) | MIGRATE_PFN_LOCKED;
return 0;
error_dma_unmap:
mutex_unlock(&svmm->mutex);
dma_unmap_page(dev, *dma_addr, PAGE_SIZE, DMA_BIDIRECTIONAL);
error_free_page:
__free_page(dpage);
@ -531,7 +537,8 @@ 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 +568,7 @@ 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 +592,8 @@ 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 +624,7 @@ nouveau_dmem_migrate_vma(struct nouveau_drm *drm,
struct migrate_vma args = {
.vma = vma,
.start = start,
.pgmap_owner = drm->dev,
.flags = MIGRATE_VMA_SELECT_SYSTEM,
};
unsigned long i;

21
drivers/gpu/drm/nouveau/nouveau_svm.c
View File

@ -93,17 +93,6 @@ nouveau_ivmm_find(struct nouveau_svm *svm, u64 inst)
return NULL;
}
struct nouveau_svmm {
struct mmu_notifier notifier;
struct nouveau_vmm *vmm;
struct {
unsigned long start;
unsigned long limit;
} unmanaged;
struct mutex mutex;
};
#define SVMM_DBG(s,f,a...) \
NV_DEBUG((s)->vmm->cli->drm, "svm-%p: "f"\n", (s), ##a)
#define SVMM_ERR(s,f,a...) \
@ -246,7 +235,7 @@ 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 +268,14 @@ 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->migrate_pgmap_owner == 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,

13
drivers/gpu/drm/nouveau/nouveau_svm.h
View File

@ -1,11 +1,21 @@
#ifndef __NOUVEAU_SVM_H__
#define __NOUVEAU_SVM_H__
#include <nvif/os.h>
#include <linux/mmu_notifier.h>
struct drm_device;
struct drm_file;
struct nouveau_drm;
struct nouveau_svmm;
struct nouveau_svmm {
struct mmu_notifier notifier;
struct nouveau_vmm *vmm;
struct {
unsigned long start;
unsigned long limit;
} unmanaged;
struct mutex mutex;
};
#if IS_ENABLED(CONFIG_DRM_NOUVEAU_SVM)
void nouveau_svm_init(struct nouveau_drm *);
@ -19,6 +29,7 @@ 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,