linux-kernel - [RFC PATCH 05/19] RMDA/siw: Convert to use vm

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Message-Id: <4f8b1d54ab5d6909c46ba5470065f8326f9fcc62.1674538665.git-series.apopple@nvidia.com>
Date:   Tue, 24 Jan 2023 16:42:34 +1100
From:   Alistair Popple <apopple@...dia.com>
To:     linux-mm@...ck.org, cgroups@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, jgg@...dia.com, jhubbard@...dia.com,
        tjmercier@...gle.com, hannes@...xchg.org, surenb@...gle.com,
        mkoutny@...e.com, daniel@...ll.ch,
        Alistair Popple <apopple@...dia.com>,
        Bernard Metzler <bmt@...ich.ibm.com>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Leon Romanovsky <leon@...nel.org>, linux-rdma@...r.kernel.org
Subject: [RFC PATCH 05/19] RMDA/siw: Convert to use vm_account

Convert to using a vm_account structure to account pinned memory to
both the mm and the pins cgroup.

Signed-off-by: Alistair Popple <apopple@...dia.com>
Cc: Bernard Metzler <bmt@...ich.ibm.com>
Cc: Jason Gunthorpe <jgg@...pe.ca>
Cc: Leon Romanovsky <leon@...nel.org>
Cc: linux-rdma@...r.kernel.org
Cc: linux-kernel@...r.kernel.org
---
 drivers/infiniband/sw/siw/siw.h       |  2 +-
 drivers/infiniband/sw/siw/siw_mem.c   | 20 ++++++--------------
 drivers/infiniband/sw/siw/siw_verbs.c | 15 ---------------
 3 files changed, 7 insertions(+), 30 deletions(-)

diff --git a/drivers/infiniband/sw/siw/siw.h b/drivers/infiniband/sw/siw/siw.h
index 2f3a9cd..0c4a3ec 100644
--- a/drivers/infiniband/sw/siw/siw.h
+++ b/drivers/infiniband/sw/siw/siw.h
@@ -124,7 +124,7 @@ struct siw_umem {
 	int num_pages;
 	bool writable;
 	u64 fp_addr; /* First page base address */
-	struct mm_struct *owning_mm;
+	struct vm_account vm_account;
 };
 
 struct siw_pble {
diff --git a/drivers/infiniband/sw/siw/siw_mem.c b/drivers/infiniband/sw/siw/siw_mem.c
index b2b33dd..9c53fc3 100644
--- a/drivers/infiniband/sw/siw/siw_mem.c
+++ b/drivers/infiniband/sw/siw/siw_mem.c
@@ -68,7 +68,6 @@ static void siw_free_plist(struct siw_page_chunk *chunk, int num_pages,
 
 void siw_umem_release(struct siw_umem *umem, bool dirty)
 {
-	struct mm_struct *mm_s = umem->owning_mm;
 	int i, num_pages = umem->num_pages;
 
 	for (i = 0; num_pages; i++) {
@@ -79,9 +78,9 @@ void siw_umem_release(struct siw_umem *umem, bool dirty)
 		kfree(umem->page_chunk[i].plist);
 		num_pages -= to_free;
 	}
-	atomic64_sub(umem->num_pages, &mm_s->pinned_vm);
+	vm_unaccount_pinned(&umem->vm_account, umem->num_pages);
+	vm_account_release(&umem->vm_account);
 
-	mmdrop(mm_s);
 	kfree(umem->page_chunk);
 	kfree(umem);
 }
@@ -365,9 +364,7 @@ struct siw_pbl *siw_pbl_alloc(u32 num_buf)
 struct siw_umem *siw_umem_get(u64 start, u64 len, bool writable)
 {
 	struct siw_umem *umem;
-	struct mm_struct *mm_s;
 	u64 first_page_va;
-	unsigned long mlock_limit;
 	unsigned int foll_flags = FOLL_LONGTERM;
 	int num_pages, num_chunks, i, rv = 0;
 
@@ -385,20 +382,16 @@ struct siw_umem *siw_umem_get(u64 start, u64 len, bool writable)
 	if (!umem)
 		return ERR_PTR(-ENOMEM);
 
-	mm_s = current->mm;
-	umem->owning_mm = mm_s;
 	umem->writable = writable;
 
-	mmgrab(mm_s);
+	vm_account_init_current(&umem->vm_account);
 
 	if (writable)
 		foll_flags |= FOLL_WRITE;
 
-	mmap_read_lock(mm_s);
+	mmap_read_lock(current->mm);
 
-	mlock_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT;
-
-	if (num_pages + atomic64_read(&mm_s->pinned_vm) > mlock_limit) {
+	if (vm_account_pinned(&umem->vm_account, num_pages)) {
 		rv = -ENOMEM;
 		goto out_sem_up;
 	}
@@ -429,7 +422,6 @@ struct siw_umem *siw_umem_get(u64 start, u64 len, bool writable)
 				goto out_sem_up;
 
 			umem->num_pages += rv;
-			atomic64_add(rv, &mm_s->pinned_vm);
 			first_page_va += rv * PAGE_SIZE;
 			nents -= rv;
 			got += rv;
@@ -437,7 +429,7 @@ struct siw_umem *siw_umem_get(u64 start, u64 len, bool writable)
 		num_pages -= got;
 	}
 out_sem_up:
-	mmap_read_unlock(mm_s);
+	mmap_read_unlock(current->mm);
 
 	if (rv > 0)
 		return umem;
diff --git a/drivers/infiniband/sw/siw/siw_verbs.c b/drivers/infiniband/sw/siw/siw_verbs.c
index 906fde1..8fab009 100644
--- a/drivers/infiniband/sw/siw/siw_verbs.c
+++ b/drivers/infiniband/sw/siw/siw_verbs.c
@@ -1321,8 +1321,6 @@ struct ib_mr *siw_reg_user_mr(struct ib_pd *pd, u64 start, u64 len,
 	struct siw_umem *umem = NULL;
 	struct siw_ureq_reg_mr ureq;
 	struct siw_device *sdev = to_siw_dev(pd->device);
-
-	unsigned long mem_limit = rlimit(RLIMIT_MEMLOCK);
 	int rv;
 
 	siw_dbg_pd(pd, "start: 0x%pK, va: 0x%pK, len: %llu\n",
@@ -1338,19 +1336,6 @@ struct ib_mr *siw_reg_user_mr(struct ib_pd *pd, u64 start, u64 len,
 		rv = -EINVAL;
 		goto err_out;
 	}
-	if (mem_limit != RLIM_INFINITY) {
-		unsigned long num_pages =
-			(PAGE_ALIGN(len + (start & ~PAGE_MASK))) >> PAGE_SHIFT;
-		mem_limit >>= PAGE_SHIFT;
-
-		if (num_pages > mem_limit - current->mm->locked_vm) {
-			siw_dbg_pd(pd, "pages req %lu, max %lu, lock %lu\n",
-				   num_pages, mem_limit,
-				   current->mm->locked_vm);
-			rv = -ENOMEM;
-			goto err_out;
-		}
-	}
 	umem = siw_umem_get(start, len, ib_access_writable(rights));
 	if (IS_ERR(umem)) {
 		rv = PTR_ERR(umem);
-- 
git-series 0.9.1