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Subject[PATCH 33/64] arch/powerpc: use mm locking wrappers
Date
From: Davidlohr Bueso <dave@stgolabs.net>

This becomes quite straightforward with the mmrange in place.
For those mmap_sem callers who don't, we add it within the same
function context.

Signed-off-by: Davidlohr Bueso <dbueso@suse.de>
---
arch/powerpc/kernel/vdso.c | 7 ++++---
arch/powerpc/kvm/book3s_64_mmu_hv.c | 6 ++++--
arch/powerpc/kvm/book3s_64_mmu_radix.c | 6 ++++--
arch/powerpc/kvm/book3s_64_vio.c | 5 +++--
arch/powerpc/kvm/book3s_hv.c | 7 ++++---
arch/powerpc/kvm/e500_mmu_host.c | 5 +++--
arch/powerpc/mm/copro_fault.c | 4 ++--
arch/powerpc/mm/mmu_context_iommu.c | 5 +++--
arch/powerpc/mm/subpage-prot.c | 13 +++++++------
arch/powerpc/oprofile/cell/spu_task_sync.c | 7 ++++---
arch/powerpc/platforms/cell/spufs/file.c | 6 ++++--
arch/powerpc/platforms/powernv/npu-dma.c | 2 +-
12 files changed, 43 insertions(+), 30 deletions(-)

diff --git a/arch/powerpc/kernel/vdso.c b/arch/powerpc/kernel/vdso.c
index 22b01a3962f0..869632b601b8 100644
--- a/arch/powerpc/kernel/vdso.c
+++ b/arch/powerpc/kernel/vdso.c
@@ -155,6 +155,7 @@ int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp)
unsigned long vdso_pages;
unsigned long vdso_base;
int rc;
+ DEFINE_RANGE_LOCK_FULL(mmrange);

if (!vdso_ready)
return 0;
@@ -196,7 +197,7 @@ int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp)
* and end up putting it elsewhere.
* Add enough to the size so that the result can be aligned.
*/
- if (down_write_killable(&mm->mmap_sem))
+ if (mm_write_lock_killable(mm, &mmrange))
return -EINTR;
vdso_base = get_unmapped_area(NULL, vdso_base,
(vdso_pages << PAGE_SHIFT) +
@@ -236,11 +237,11 @@ int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp)
goto fail_mmapsem;
}

- up_write(&mm->mmap_sem);
+ mm_write_unlock(mm, &mmrange);
return 0;

fail_mmapsem:
- up_write(&mm->mmap_sem);
+ mm_write_unlock(mm, &mmrange);
return rc;
}

diff --git a/arch/powerpc/kvm/book3s_64_mmu_hv.c b/arch/powerpc/kvm/book3s_64_mmu_hv.c
index b73dbc9e797d..c05a99209fc1 100644
--- a/arch/powerpc/kvm/book3s_64_mmu_hv.c
+++ b/arch/powerpc/kvm/book3s_64_mmu_hv.c
@@ -583,8 +583,10 @@ int kvmppc_book3s_hv_page_fault(struct kvm_run *run, struct kvm_vcpu *vcpu,
hva = gfn_to_hva_memslot(memslot, gfn);
npages = get_user_pages_fast(hva, 1, writing, pages);
if (npages < 1) {
+ DEFINE_RANGE_LOCK_FULL(mmrange);
+
/* Check if it's an I/O mapping */
- down_read(&current->mm->mmap_sem);
+ mm_read_lock(current->mm, &mmrange);
vma = find_vma(current->mm, hva);
if (vma && vma->vm_start <= hva && hva + psize <= vma->vm_end &&
(vma->vm_flags & VM_PFNMAP)) {
@@ -594,7 +596,7 @@ int kvmppc_book3s_hv_page_fault(struct kvm_run *run, struct kvm_vcpu *vcpu,
is_ci = pte_ci(__pte((pgprot_val(vma->vm_page_prot))));
write_ok = vma->vm_flags & VM_WRITE;
}
- up_read(&current->mm->mmap_sem);
+ mm_read_unlock(current->mm, &mmrange);
if (!pfn)
goto out_put;
} else {
diff --git a/arch/powerpc/kvm/book3s_64_mmu_radix.c b/arch/powerpc/kvm/book3s_64_mmu_radix.c
index 0c854816e653..9a4d1758b0db 100644
--- a/arch/powerpc/kvm/book3s_64_mmu_radix.c
+++ b/arch/powerpc/kvm/book3s_64_mmu_radix.c
@@ -397,8 +397,10 @@ int kvmppc_book3s_radix_page_fault(struct kvm_run *run, struct kvm_vcpu *vcpu,
level = 0;
npages = get_user_pages_fast(hva, 1, writing, pages);
if (npages < 1) {
+ DEFINE_RANGE_LOCK_FULL(mmrange);
+
/* Check if it's an I/O mapping */
- down_read(&current->mm->mmap_sem);
+ mm_read_lock(current->mm, &mmrange);
vma = find_vma(current->mm, hva);
if (vma && vma->vm_start <= hva && hva < vma->vm_end &&
(vma->vm_flags & VM_PFNMAP)) {
@@ -406,7 +408,7 @@ int kvmppc_book3s_radix_page_fault(struct kvm_run *run, struct kvm_vcpu *vcpu,
((hva - vma->vm_start) >> PAGE_SHIFT);
pgflags = pgprot_val(vma->vm_page_prot);
}
- up_read(&current->mm->mmap_sem);
+ mm_read_unlock(current->mm, &mmrange);
if (!pfn)
return -EFAULT;
} else {
diff --git a/arch/powerpc/kvm/book3s_64_vio.c b/arch/powerpc/kvm/book3s_64_vio.c
index 4dffa611376d..5e6fe2820009 100644
--- a/arch/powerpc/kvm/book3s_64_vio.c
+++ b/arch/powerpc/kvm/book3s_64_vio.c
@@ -60,11 +60,12 @@ static unsigned long kvmppc_stt_pages(unsigned long tce_pages)
static long kvmppc_account_memlimit(unsigned long stt_pages, bool inc)
{
long ret = 0;
+ DEFINE_RANGE_LOCK_FULL(mmrange);

if (!current || !current->mm)
return ret; /* process exited */

- down_write(&current->mm->mmap_sem);
+ mm_write_lock(current->mm, &mmrange);

if (inc) {
unsigned long locked, lock_limit;
@@ -89,7 +90,7 @@ static long kvmppc_account_memlimit(unsigned long stt_pages, bool inc)
rlimit(RLIMIT_MEMLOCK),
ret ? " - exceeded" : "");

- up_write(&current->mm->mmap_sem);
+ mm_write_unlock(current->mm, &mmrange);

return ret;
}
diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c
index 473f6eebe34f..1bf281f37713 100644
--- a/arch/powerpc/kvm/book3s_hv.c
+++ b/arch/powerpc/kvm/book3s_hv.c
@@ -3610,6 +3610,7 @@ static int kvmppc_hv_setup_htab_rma(struct kvm_vcpu *vcpu)
unsigned long lpcr = 0, senc;
unsigned long psize, porder;
int srcu_idx;
+ DEFINE_RANGE_LOCK_FULL(mmrange);

/* Allocate hashed page table (if not done already) and reset it */
if (!kvm->arch.hpt.virt) {
@@ -3642,7 +3643,7 @@ static int kvmppc_hv_setup_htab_rma(struct kvm_vcpu *vcpu)

/* Look up the VMA for the start of this memory slot */
hva = memslot->userspace_addr;
- down_read(&current->mm->mmap_sem);
+ mm_read_lock(current->mm, &mmrange);
vma = find_vma(current->mm, hva);
if (!vma || vma->vm_start > hva || (vma->vm_flags & VM_IO))
goto up_out;
@@ -3650,7 +3651,7 @@ static int kvmppc_hv_setup_htab_rma(struct kvm_vcpu *vcpu)
psize = vma_kernel_pagesize(vma);
porder = __ilog2(psize);

- up_read(&current->mm->mmap_sem);
+ mm_read_unlock(current->mm, &mmrange);

/* We can handle 4k, 64k or 16M pages in the VRMA */
err = -EINVAL;
@@ -3680,7 +3681,7 @@ static int kvmppc_hv_setup_htab_rma(struct kvm_vcpu *vcpu)
return err;

up_out:
- up_read(&current->mm->mmap_sem);
+ mm_read_unlock(current->mm, &mmrange);
goto out_srcu;
}

diff --git a/arch/powerpc/kvm/e500_mmu_host.c b/arch/powerpc/kvm/e500_mmu_host.c
index 423b21393bc9..72ce80fa9453 100644
--- a/arch/powerpc/kvm/e500_mmu_host.c
+++ b/arch/powerpc/kvm/e500_mmu_host.c
@@ -358,7 +358,8 @@ static inline int kvmppc_e500_shadow_map(struct kvmppc_vcpu_e500 *vcpu_e500,

if (tlbsel == 1) {
struct vm_area_struct *vma;
- down_read(&current->mm->mmap_sem);
+ DEFINE_RANGE_LOCK_FULL(mmrange);
+ mm_read_lock(current->mm, &mmrange);

vma = find_vma(current->mm, hva);
if (vma && hva >= vma->vm_start &&
@@ -444,7 +445,7 @@ static inline int kvmppc_e500_shadow_map(struct kvmppc_vcpu_e500 *vcpu_e500,
tsize = max(BOOK3E_PAGESZ_4K, tsize & ~1);
}

- up_read(&current->mm->mmap_sem);
+ mm_read_unlock(current->mm, &mmrange);
}

if (likely(!pfnmap)) {
diff --git a/arch/powerpc/mm/copro_fault.c b/arch/powerpc/mm/copro_fault.c
index 8f5e604828a1..570ebca7e2f8 100644
--- a/arch/powerpc/mm/copro_fault.c
+++ b/arch/powerpc/mm/copro_fault.c
@@ -47,7 +47,7 @@ int copro_handle_mm_fault(struct mm_struct *mm, unsigned long ea,
if (mm->pgd == NULL)
return -EFAULT;

- down_read(&mm->mmap_sem);
+ mm_read_lock(mm, &mmrange);
ret = -EFAULT;
vma = find_vma(mm, ea);
if (!vma)
@@ -97,7 +97,7 @@ int copro_handle_mm_fault(struct mm_struct *mm, unsigned long ea,
current->min_flt++;

out_unlock:
- up_read(&mm->mmap_sem);
+ mm_read_unlock(mm, &mmrange);
return ret;
}
EXPORT_SYMBOL_GPL(copro_handle_mm_fault);
diff --git a/arch/powerpc/mm/mmu_context_iommu.c b/arch/powerpc/mm/mmu_context_iommu.c
index 91ee2231c527..35d32a8ccb89 100644
--- a/arch/powerpc/mm/mmu_context_iommu.c
+++ b/arch/powerpc/mm/mmu_context_iommu.c
@@ -36,11 +36,12 @@ static long mm_iommu_adjust_locked_vm(struct mm_struct *mm,
unsigned long npages, bool incr)
{
long ret = 0, locked, lock_limit;
+ DEFINE_RANGE_LOCK_FULL(mmrange);

if (!npages)
return 0;

- down_write(&mm->mmap_sem);
+ mm_write_lock(mm, &mmrange);

if (incr) {
locked = mm->locked_vm + npages;
@@ -61,7 +62,7 @@ static long mm_iommu_adjust_locked_vm(struct mm_struct *mm,
npages << PAGE_SHIFT,
mm->locked_vm << PAGE_SHIFT,
rlimit(RLIMIT_MEMLOCK));
- up_write(&mm->mmap_sem);
+ mm_write_unlock(mm, &mmrange);

return ret;
}
diff --git a/arch/powerpc/mm/subpage-prot.c b/arch/powerpc/mm/subpage-prot.c
index f14a07c2fb90..0afd636123fd 100644
--- a/arch/powerpc/mm/subpage-prot.c
+++ b/arch/powerpc/mm/subpage-prot.c
@@ -97,9 +97,10 @@ static void subpage_prot_clear(unsigned long addr, unsigned long len)
u32 **spm, *spp;
unsigned long i;
size_t nw;
+ DEFINE_RANGE_LOCK_FULL(mmrange);
unsigned long next, limit;

- down_write(&mm->mmap_sem);
+ mm_write_lock(mm, &mmrange);
limit = addr + len;
if (limit > spt->maxaddr)
limit = spt->maxaddr;
@@ -127,7 +128,7 @@ static void subpage_prot_clear(unsigned long addr, unsigned long len)
/* now flush any existing HPTEs for the range */
hpte_flush_range(mm, addr, nw);
}
- up_write(&mm->mmap_sem);
+ mm_write_unlock(mm, &mmrange);
}

#ifdef CONFIG_TRANSPARENT_HUGEPAGE
@@ -216,7 +217,7 @@ long sys_subpage_prot(unsigned long addr, unsigned long len, u32 __user *map)
if (!access_ok(VERIFY_READ, map, (len >> PAGE_SHIFT) * sizeof(u32)))
return -EFAULT;

- down_write(&mm->mmap_sem);
+ mm_write_lock(mm, &mmrange);
subpage_mark_vma_nohuge(mm, addr, len);
for (limit = addr + len; addr < limit; addr = next) {
next = pmd_addr_end(addr, limit);
@@ -251,11 +252,11 @@ long sys_subpage_prot(unsigned long addr, unsigned long len, u32 __user *map)
if (addr + (nw << PAGE_SHIFT) > next)
nw = (next - addr) >> PAGE_SHIFT;

- up_write(&mm->mmap_sem);
+ mm_write_unlock(mm, &mmrange);
if (__copy_from_user(spp, map, nw * sizeof(u32)))
return -EFAULT;
map += nw;
- down_write(&mm->mmap_sem);
+ mm_write_lock(mm, &mmrange);

/* now flush any existing HPTEs for the range */
hpte_flush_range(mm, addr, nw);
@@ -264,6 +265,6 @@ long sys_subpage_prot(unsigned long addr, unsigned long len, u32 __user *map)
spt->maxaddr = limit;
err = 0;
out:
- up_write(&mm->mmap_sem);
+ mm_write_unlock(mm, &mmrange);
return err;
}
diff --git a/arch/powerpc/oprofile/cell/spu_task_sync.c b/arch/powerpc/oprofile/cell/spu_task_sync.c
index 44d67b167e0b..50ebb615fdab 100644
--- a/arch/powerpc/oprofile/cell/spu_task_sync.c
+++ b/arch/powerpc/oprofile/cell/spu_task_sync.c
@@ -325,6 +325,7 @@ get_exec_dcookie_and_offset(struct spu *spu, unsigned int *offsetp,
struct vm_area_struct *vma;
struct file *exe_file;
struct mm_struct *mm = spu->mm;
+ DEFINE_RANGE_LOCK_FULL(mmrange);

if (!mm)
goto out;
@@ -336,7 +337,7 @@ get_exec_dcookie_and_offset(struct spu *spu, unsigned int *offsetp,
fput(exe_file);
}

- down_read(&mm->mmap_sem);
+ mm_read_lock(mm, &mmrange);
for (vma = mm->mmap; vma; vma = vma->vm_next) {
if (vma->vm_start > spu_ref || vma->vm_end <= spu_ref)
continue;
@@ -353,13 +354,13 @@ get_exec_dcookie_and_offset(struct spu *spu, unsigned int *offsetp,
*spu_bin_dcookie = fast_get_dcookie(&vma->vm_file->f_path);
pr_debug("got dcookie for %pD\n", vma->vm_file);

- up_read(&mm->mmap_sem);
+ mm_read_unlock(mm, &mmrange);

out:
return app_cookie;

fail_no_image_cookie:
- up_read(&mm->mmap_sem);
+ mm_read_unlock(mm, &mmrange);

printk(KERN_ERR "SPU_PROF: "
"%s, line %d: Cannot find dcookie for SPU binary\n",
diff --git a/arch/powerpc/platforms/cell/spufs/file.c b/arch/powerpc/platforms/cell/spufs/file.c
index c1be486da899..f2017a915bd8 100644
--- a/arch/powerpc/platforms/cell/spufs/file.c
+++ b/arch/powerpc/platforms/cell/spufs/file.c
@@ -347,11 +347,13 @@ static int spufs_ps_fault(struct vm_fault *vmf,
goto refault;

if (ctx->state == SPU_STATE_SAVED) {
- up_read(&current->mm->mmap_sem);
+ DEFINE_RANGE_LOCK_FULL(mmrange);
+
+ mm_read_unlock(current->mm, &mmrange);
spu_context_nospu_trace(spufs_ps_fault__sleep, ctx);
ret = spufs_wait(ctx->run_wq, ctx->state == SPU_STATE_RUNNABLE);
spu_context_trace(spufs_ps_fault__wake, ctx, ctx->spu);
- down_read(&current->mm->mmap_sem);
+ mm_read_lock(current->mm, &mmrange);
} else {
area = ctx->spu->problem_phys + ps_offs;
vm_insert_pfn(vmf->vma, vmf->address, (area + offset) >> PAGE_SHIFT);
diff --git a/arch/powerpc/platforms/powernv/npu-dma.c b/arch/powerpc/platforms/powernv/npu-dma.c
index 759e9a4c7479..8cf4be123663 100644
--- a/arch/powerpc/platforms/powernv/npu-dma.c
+++ b/arch/powerpc/platforms/powernv/npu-dma.c
@@ -802,7 +802,7 @@ int pnv_npu2_handle_fault(struct npu_context *context, uintptr_t *ea,
if (!firmware_has_feature(FW_FEATURE_OPAL))
return -ENODEV;

- WARN_ON(!rwsem_is_locked(&mm->mmap_sem));
+ WARN_ON(!mm_is_locked(mm, mmrange));

for (i = 0; i < count; i++) {
is_write = flags[i] & NPU2_WRITE;
--
2.13.6
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