From: Christoph Hellwig <hch@lst.de>
To: "Jérôme Glisse" <jglisse@redhat.com>,
"Jason Gunthorpe" <jgg@mellanox.com>,
"Ben Skeggs" <bskeggs@redhat.com>
Cc: Ralph Campbell <rcampbell@nvidia.com>,
linux-mm@kvack.org, nouveau@lists.freedesktop.org,
dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org
Subject: [PATCH 2/7] mm: move hmm_vma_range_done and hmm_vma_fault to nouveau
Date: Wed, 24 Jul 2019 08:52:53 +0200 [thread overview]
Message-ID: <20190724065258.16603-3-hch@lst.de> (raw)
In-Reply-To: <20190724065258.16603-1-hch@lst.de>
These two functions are marked as a legacy APIs to get rid of, but seem
to suit the current nouveau flow. Move it to the only user in
preparation for fixing a locking bug involving caller and callee.
All comments referring to the old API have been removed as this now
is a driver private helper.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Jason Gunthorpe <jgg@mellanox.com>
---
drivers/gpu/drm/nouveau/nouveau_svm.c | 46 ++++++++++++++++++++++-
include/linux/hmm.h | 54 ---------------------------
2 files changed, 44 insertions(+), 56 deletions(-)
diff --git a/drivers/gpu/drm/nouveau/nouveau_svm.c b/drivers/gpu/drm/nouveau/nouveau_svm.c
index 8c92374afcf2..6c1b04de0db8 100644
--- a/drivers/gpu/drm/nouveau/nouveau_svm.c
+++ b/drivers/gpu/drm/nouveau/nouveau_svm.c
@@ -475,6 +475,48 @@ nouveau_svm_fault_cache(struct nouveau_svm *svm,
fault->inst, fault->addr, fault->access);
}
+static inline bool
+nouveau_range_done(struct hmm_range *range)
+{
+ bool ret = hmm_range_valid(range);
+
+ hmm_range_unregister(range);
+ return ret;
+}
+
+static int
+nouveau_range_fault(struct hmm_mirror *mirror, struct hmm_range *range,
+ bool block)
+{
+ long ret;
+
+ range->default_flags = 0;
+ range->pfn_flags_mask = -1UL;
+
+ ret = hmm_range_register(range, mirror,
+ range->start, range->end,
+ PAGE_SHIFT);
+ if (ret)
+ return (int)ret;
+
+ if (!hmm_range_wait_until_valid(range, HMM_RANGE_DEFAULT_TIMEOUT)) {
+ up_read(&range->vma->vm_mm->mmap_sem);
+ return -EAGAIN;
+ }
+
+ ret = hmm_range_fault(range, block);
+ if (ret <= 0) {
+ if (ret == -EBUSY || !ret) {
+ up_read(&range->vma->vm_mm->mmap_sem);
+ ret = -EBUSY;
+ } else if (ret == -EAGAIN)
+ ret = -EBUSY;
+ hmm_range_unregister(range);
+ return ret;
+ }
+ return 0;
+}
+
static int
nouveau_svm_fault(struct nvif_notify *notify)
{
@@ -649,10 +691,10 @@ nouveau_svm_fault(struct nvif_notify *notify)
range.values = nouveau_svm_pfn_values;
range.pfn_shift = NVIF_VMM_PFNMAP_V0_ADDR_SHIFT;
again:
- ret = hmm_vma_fault(&svmm->mirror, &range, true);
+ ret = nouveau_range_fault(&svmm->mirror, &range, true);
if (ret == 0) {
mutex_lock(&svmm->mutex);
- if (!hmm_vma_range_done(&range)) {
+ if (!nouveau_range_done(&range)) {
mutex_unlock(&svmm->mutex);
goto again;
}
diff --git a/include/linux/hmm.h b/include/linux/hmm.h
index b8a08b2a10ca..7ef56dc18050 100644
--- a/include/linux/hmm.h
+++ b/include/linux/hmm.h
@@ -484,60 +484,6 @@ long hmm_range_dma_unmap(struct hmm_range *range,
*/
#define HMM_RANGE_DEFAULT_TIMEOUT 1000
-/* This is a temporary helper to avoid merge conflict between trees. */
-static inline bool hmm_vma_range_done(struct hmm_range *range)
-{
- bool ret = hmm_range_valid(range);
-
- hmm_range_unregister(range);
- return ret;
-}
-
-/* This is a temporary helper to avoid merge conflict between trees. */
-static inline int hmm_vma_fault(struct hmm_mirror *mirror,
- struct hmm_range *range, bool block)
-{
- long ret;
-
- /*
- * With the old API the driver must set each individual entries with
- * the requested flags (valid, write, ...). So here we set the mask to
- * keep intact the entries provided by the driver and zero out the
- * default_flags.
- */
- range->default_flags = 0;
- range->pfn_flags_mask = -1UL;
-
- ret = hmm_range_register(range, mirror,
- range->start, range->end,
- PAGE_SHIFT);
- if (ret)
- return (int)ret;
-
- if (!hmm_range_wait_until_valid(range, HMM_RANGE_DEFAULT_TIMEOUT)) {
- /*
- * The mmap_sem was taken by driver we release it here and
- * returns -EAGAIN which correspond to mmap_sem have been
- * drop in the old API.
- */
- up_read(&range->vma->vm_mm->mmap_sem);
- return -EAGAIN;
- }
-
- ret = hmm_range_fault(range, block);
- if (ret <= 0) {
- if (ret == -EBUSY || !ret) {
- /* Same as above, drop mmap_sem to match old API. */
- up_read(&range->vma->vm_mm->mmap_sem);
- ret = -EBUSY;
- } else if (ret == -EAGAIN)
- ret = -EBUSY;
- hmm_range_unregister(range);
- return ret;
- }
- return 0;
-}
-
/* Below are for HMM internal use only! Not to be used by device driver! */
static inline void hmm_mm_init(struct mm_struct *mm)
{
--
2.20.1
next prev parent reply other threads:[~2019-07-24 6:53 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-24 6:52 hmm_range_fault related fixes and legacy API removal v3 Christoph Hellwig
2019-07-24 6:52 ` [PATCH 1/7] mm: always return EBUSY for invalid ranges in hmm_range_{fault,snapshot} Christoph Hellwig
2019-07-24 6:52 ` Christoph Hellwig [this message]
2019-07-24 6:52 ` [PATCH 3/7] nouveau: remove the block parameter to nouveau_range_fault Christoph Hellwig
2019-07-24 6:52 ` [PATCH 4/7] nouveau: unlock mmap_sem on all errors from nouveau_range_fault Christoph Hellwig
2019-07-24 6:52 ` [PATCH 5/7] nouveau: return -EBUSY when hmm_range_wait_until_valid fails Christoph Hellwig
2019-07-24 6:52 ` [PATCH 6/7] mm: remove the legacy hmm_pfn_* APIs Christoph Hellwig
2019-07-24 6:52 ` [PATCH 7/7] mm: comment on VM_FAULT_RETRY semantics in handle_mm_fault Christoph Hellwig
2019-07-26 0:16 ` hmm_range_fault related fixes and legacy API removal v3 Jason Gunthorpe
2019-07-26 0:55 ` Ralph Campbell
2019-07-26 4:57 ` Christoph Hellwig
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