Re: [RESEND PATCH 3/7] mm/gup: Change GUP fast to use flags rather than a write 'bool'
On Thu, Feb 21, 2019 at 08:48:41AM +0530, Souptick Joarder wrote:
> Hi Ira,
>
> On Wed, Feb 20, 2019 at 11:01 AM wrote:
> >
> > From: Ira Weiny
> >
> > To facilitate additional options to get_user_pages_fast() change the
> > singular write parameter to be gup_flags.
> >
> > This patch does not change any functionality. New functionality will
> > follow in subsequent patches.
> >
> > Some of the get_user_pages_fast() call sites were unchanged because they
> > already passed FOLL_WRITE or 0 for the write parameter.
> >
> > Signed-off-by: Ira Weiny
> > ---
[snip]
> > diff --git a/arch/powerpc/kvm/book3s_64_mmu_hv.c
> > b/arch/powerpc/kvm/book3s_64_mmu_hv.c
> > index bd2dcfbf00cd..8fcb0a921e46 100644
> > --- a/arch/powerpc/kvm/book3s_64_mmu_hv.c
> > +++ b/arch/powerpc/kvm/book3s_64_mmu_hv.c
> > @@ -582,7 +582,7 @@ int kvmppc_book3s_hv_page_fault(struct kvm_run *run,
> > struct kvm_vcpu *vcpu,
> > /* If writing != 0, then the HPTE must allow writing, if we get
> > here */
> > write_ok = writing;
> > hva = gfn_to_hva_memslot(memslot, gfn);
> > - npages = get_user_pages_fast(hva, 1, writing, pages);
> > + npages = get_user_pages_fast(hva, 1, writing ? FOLL_WRITE : 0,
> > pages);
>
> Just requesting for opinion,
> * writing ? FOLL_WRITE : 0 * is used in many places. How about placing it in a
> macro/ inline ?
I don't really think this would gain much. And I don't think it would be more
clear. In fact I can't even think of a macro name which would make sense. I'm
inclined to leave this as written.
Ira
>
> > if (npages < 1) {
> > /* Check if it's an I/O mapping */
> > down_read(>mm->mmap_sem);
> > @@ -1175,7 +1175,7 @@ void *kvmppc_pin_guest_page(struct kvm *kvm, unsigned
> > long gpa,
> > if (!memslot || (memslot->flags & KVM_MEMSLOT_INVALID))
> > goto err;
> > hva = gfn_to_hva_memslot(memslot, gfn);
> > - npages = get_user_pages_fast(hva, 1, 1, pages);
> > + npages = get_user_pages_fast(hva, 1, FOLL_WRITE, pages);
> > if (npages < 1)
> > goto err;
> > page = pages[0];
> > diff --git a/arch/powerpc/kvm/e500_mmu.c b/arch/powerpc/kvm/e500_mmu.c
> > index 24296f4cadc6..e0af53fd78c5 100644
> > --- a/arch/powerpc/kvm/e500_mmu.c
> > +++ b/arch/powerpc/kvm/e500_mmu.c
> > @@ -783,7 +783,7 @@ int kvm_vcpu_ioctl_config_tlb(struct kvm_vcpu *vcpu,
> > if (!pages)
> > return -ENOMEM;
> >
> > - ret = get_user_pages_fast(cfg->array, num_pages, 1, pages);
> > + ret = get_user_pages_fast(cfg->array, num_pages, FOLL_WRITE, pages);
> > if (ret < 0)
> > goto free_pages;
> >
> > diff --git a/arch/powerpc/mm/mmu_context_iommu.c
> > b/arch/powerpc/mm/mmu_context_iommu.c
> > index a712a650a8b6..acb0990c8364 100644
> > --- a/arch/powerpc/mm/mmu_context_iommu.c
> > +++ b/arch/powerpc/mm/mmu_context_iommu.c
> > @@ -190,7 +190,7 @@ static long mm_iommu_do_alloc(struct mm_struct *mm,
> > unsigned long ua,
> > for (i = 0; i < entries; ++i) {
> > cur_ua = ua + (i << PAGE_SHIFT);
> > if (1 != get_user_pages_fast(cur_ua,
> > - 1/* pages */, 1/* iswrite */,
> > )) {
> > + 1/* pages */, FOLL_WRITE, )) {
> > ret = -EFAULT;
> > for (j = 0; j < i; ++j)
> > put_page(pfn_to_page(mem->hpas[j] >>
> > @@ -209,7 +209,7 @@ static long mm_iommu_do_alloc(struct mm_struct *mm,
> > unsigned long ua,
> > if (mm_iommu_move_page_from_cma(page))
> > goto populate;
> > if (1 != get_user_pages_fast(cur_ua,
> > - 1/* pages */, 1/* iswrite
> > */,
> > + 1/* pages */, FOLL_WRITE,
> > )) {
> > ret = -EFAULT;
> > for (j = 0; j < i; ++j)
> > diff --git a/arch/s390/kvm/interrupt.c b/arch/s390/kvm/interrupt.c
> > index fcb55b02990e..69d9366b966c 100644
> > --- a/arch/s390/kvm/interrupt.c
> > +++ b/arch/s390/kvm/interrupt.c
> > @@ -2278,7 +2278,7 @@ static int kvm_s390_adapter_map(struct kvm *kvm,
> > unsigned int id, __u64 addr)
> > ret = -EFAULT;
> > goto out;
> > }
> > - ret = get_user_pages_fast(map->addr, 1, 1, >page);
> > + ret = get_user_pages_fast(map->addr, 1, FOLL_WRITE, >page);
> > if (ret < 0)
> > goto out;
> > BUG_ON(ret != 1);
> > diff --git a/arch/s390/mm/gup.c b/arch/s390/mm/gup.c
> > index 2809d11c7a28..0a6faf3d9960 100644
> > --- a/arch/s390/mm/gup.c
> > +++ b/arch/s390/mm/gup.c
> > @@ -265,7 +265,7 @@ int __get_user_pages_fast(unsigned long start, int
> > nr_pages, int
Re: [RESEND PATCH 3/7] mm/gup: Change GUP fast to use flags rather than a write 'bool'
Hi Ira,
On Wed, Feb 20, 2019 at 11:01 AM wrote:
>
> From: Ira Weiny
>
> To facilitate additional options to get_user_pages_fast() change the
> singular write parameter to be gup_flags.
>
> This patch does not change any functionality. New functionality will
> follow in subsequent patches.
>
> Some of the get_user_pages_fast() call sites were unchanged because they
> already passed FOLL_WRITE or 0 for the write parameter.
>
> Signed-off-by: Ira Weiny
> ---
> arch/mips/mm/gup.c | 11 ++-
> arch/powerpc/kvm/book3s_64_mmu_hv.c| 4 ++--
> arch/powerpc/kvm/e500_mmu.c| 2 +-
> arch/powerpc/mm/mmu_context_iommu.c| 4 ++--
> arch/s390/kvm/interrupt.c | 2 +-
> arch/s390/mm/gup.c | 12 ++--
> arch/sh/mm/gup.c | 11 ++-
> arch/sparc/mm/gup.c| 9 +
> arch/x86/kvm/paging_tmpl.h | 2 +-
> arch/x86/kvm/svm.c | 2 +-
> drivers/fpga/dfl-afu-dma-region.c | 2 +-
> drivers/gpu/drm/via/via_dmablit.c | 3 ++-
> drivers/infiniband/hw/hfi1/user_pages.c| 3 ++-
> drivers/misc/genwqe/card_utils.c | 2 +-
> drivers/misc/vmw_vmci/vmci_host.c | 2 +-
> drivers/misc/vmw_vmci/vmci_queue_pair.c| 6 --
> drivers/platform/goldfish/goldfish_pipe.c | 3 ++-
> drivers/rapidio/devices/rio_mport_cdev.c | 4 +++-
> drivers/sbus/char/oradax.c | 2 +-
> drivers/scsi/st.c | 3 ++-
> drivers/staging/gasket/gasket_page_table.c | 4 ++--
> drivers/tee/tee_shm.c | 2 +-
> drivers/vfio/vfio_iommu_spapr_tce.c| 3 ++-
> drivers/vhost/vhost.c | 2 +-
> drivers/video/fbdev/pvr2fb.c | 2 +-
> drivers/virt/fsl_hypervisor.c | 2 +-
> drivers/xen/gntdev.c | 2 +-
> fs/orangefs/orangefs-bufmap.c | 2 +-
> include/linux/mm.h | 4 ++--
> kernel/futex.c | 2 +-
> lib/iov_iter.c | 7 +--
> mm/gup.c | 10 +-
> mm/util.c | 8
> net/ceph/pagevec.c | 2 +-
> net/rds/info.c | 2 +-
> net/rds/rdma.c | 3 ++-
> 36 files changed, 81 insertions(+), 65 deletions(-)
>
> diff --git a/arch/mips/mm/gup.c b/arch/mips/mm/gup.c
> index 0d14e0d8eacf..4c2b4483683c 100644
> --- a/arch/mips/mm/gup.c
> +++ b/arch/mips/mm/gup.c
> @@ -235,7 +235,7 @@ int __get_user_pages_fast(unsigned long start, int
> nr_pages, int write,
> * get_user_pages_fast() - pin user pages in memory
> * @start: starting user address
> * @nr_pages: number of pages from start to pin
> - * @write: whether pages will be written to
> + * @gup_flags: flags modifying pin behaviour
> * @pages: array that receives pointers to the pages pinned.
> * Should be at least nr_pages long.
> *
> @@ -247,8 +247,8 @@ int __get_user_pages_fast(unsigned long start, int
> nr_pages, int write,
> * requested. If nr_pages is 0 or negative, returns 0. If no pages
> * were pinned, returns -errno.
> */
> -int get_user_pages_fast(unsigned long start, int nr_pages, int write,
> - struct page **pages)
> +int get_user_pages_fast(unsigned long start, int nr_pages,
> + unsigned int gup_flags, struct page **pages)
> {
> struct mm_struct *mm = current->mm;
> unsigned long addr, len, end;
> @@ -273,7 +273,8 @@ int get_user_pages_fast(unsigned long start, int
> nr_pages, int write,
> next = pgd_addr_end(addr, end);
> if (pgd_none(pgd))
> goto slow;
> - if (!gup_pud_range(pgd, addr, next, write, pages, ))
> + if (!gup_pud_range(pgd, addr, next, gup_flags & FOLL_WRITE,
> + pages, ))
> goto slow;
> } while (pgdp++, addr = next, addr != end);
> local_irq_enable();
> @@ -289,7 +290,7 @@ int get_user_pages_fast(unsigned long start, int
> nr_pages, int write,
> pages += nr;
>
> ret = get_user_pages_unlocked(start, (end - start) >> PAGE_SHIFT,
> - pages, write ? FOLL_WRITE : 0);
> + pages, gup_flags);
>
> /* Have to be a bit careful with return values */
> if (nr > 0) {
> diff --git a/arch/powerpc/kvm/book3s_64_mmu_hv.c
> b/arch/powerpc/kvm/book3s_64_mmu_hv.c
> index bd2dcfbf00cd..8fcb0a921e46 100644
> --- a/arch/powerpc/kvm/book3s_64_mmu_hv.c
> +++ b/arch/powerpc/kvm/book3s_64_mmu_hv.c
> @@ -582,7 +582,7 @@ int kvmppc_book3s_hv_page_fault(struct kvm_run *run,
> struct kvm_vcpu *vcpu,
> /*
Re: [RESEND PATCH 3/7] mm/gup: Change GUP fast to use flags rather than a write 'bool'
Hi Ira
Martin and I looked at your patch and agree that it doesn't change
functionality for Orangefs.
Reviewed-by: Mike Marshall
On Wed, Feb 20, 2019 at 12:32 AM wrote:
>
> From: Ira Weiny
>
> To facilitate additional options to get_user_pages_fast() change the
> singular write parameter to be gup_flags.
>
> This patch does not change any functionality. New functionality will
> follow in subsequent patches.
>
> Some of the get_user_pages_fast() call sites were unchanged because they
> already passed FOLL_WRITE or 0 for the write parameter.
>
> Signed-off-by: Ira Weiny
> ---
> arch/mips/mm/gup.c | 11 ++-
> arch/powerpc/kvm/book3s_64_mmu_hv.c| 4 ++--
> arch/powerpc/kvm/e500_mmu.c| 2 +-
> arch/powerpc/mm/mmu_context_iommu.c| 4 ++--
> arch/s390/kvm/interrupt.c | 2 +-
> arch/s390/mm/gup.c | 12 ++--
> arch/sh/mm/gup.c | 11 ++-
> arch/sparc/mm/gup.c| 9 +
> arch/x86/kvm/paging_tmpl.h | 2 +-
> arch/x86/kvm/svm.c | 2 +-
> drivers/fpga/dfl-afu-dma-region.c | 2 +-
> drivers/gpu/drm/via/via_dmablit.c | 3 ++-
> drivers/infiniband/hw/hfi1/user_pages.c| 3 ++-
> drivers/misc/genwqe/card_utils.c | 2 +-
> drivers/misc/vmw_vmci/vmci_host.c | 2 +-
> drivers/misc/vmw_vmci/vmci_queue_pair.c| 6 --
> drivers/platform/goldfish/goldfish_pipe.c | 3 ++-
> drivers/rapidio/devices/rio_mport_cdev.c | 4 +++-
> drivers/sbus/char/oradax.c | 2 +-
> drivers/scsi/st.c | 3 ++-
> drivers/staging/gasket/gasket_page_table.c | 4 ++--
> drivers/tee/tee_shm.c | 2 +-
> drivers/vfio/vfio_iommu_spapr_tce.c| 3 ++-
> drivers/vhost/vhost.c | 2 +-
> drivers/video/fbdev/pvr2fb.c | 2 +-
> drivers/virt/fsl_hypervisor.c | 2 +-
> drivers/xen/gntdev.c | 2 +-
> fs/orangefs/orangefs-bufmap.c | 2 +-
> include/linux/mm.h | 4 ++--
> kernel/futex.c | 2 +-
> lib/iov_iter.c | 7 +--
> mm/gup.c | 10 +-
> mm/util.c | 8
> net/ceph/pagevec.c | 2 +-
> net/rds/info.c | 2 +-
> net/rds/rdma.c | 3 ++-
> 36 files changed, 81 insertions(+), 65 deletions(-)
>
> diff --git a/arch/mips/mm/gup.c b/arch/mips/mm/gup.c
> index 0d14e0d8eacf..4c2b4483683c 100644
> --- a/arch/mips/mm/gup.c
> +++ b/arch/mips/mm/gup.c
> @@ -235,7 +235,7 @@ int __get_user_pages_fast(unsigned long start, int
> nr_pages, int write,
> * get_user_pages_fast() - pin user pages in memory
> * @start: starting user address
> * @nr_pages: number of pages from start to pin
> - * @write: whether pages will be written to
> + * @gup_flags: flags modifying pin behaviour
> * @pages: array that receives pointers to the pages pinned.
> * Should be at least nr_pages long.
> *
> @@ -247,8 +247,8 @@ int __get_user_pages_fast(unsigned long start, int
> nr_pages, int write,
> * requested. If nr_pages is 0 or negative, returns 0. If no pages
> * were pinned, returns -errno.
> */
> -int get_user_pages_fast(unsigned long start, int nr_pages, int write,
> - struct page **pages)
> +int get_user_pages_fast(unsigned long start, int nr_pages,
> + unsigned int gup_flags, struct page **pages)
> {
> struct mm_struct *mm = current->mm;
> unsigned long addr, len, end;
> @@ -273,7 +273,8 @@ int get_user_pages_fast(unsigned long start, int
> nr_pages, int write,
> next = pgd_addr_end(addr, end);
> if (pgd_none(pgd))
> goto slow;
> - if (!gup_pud_range(pgd, addr, next, write, pages, ))
> + if (!gup_pud_range(pgd, addr, next, gup_flags & FOLL_WRITE,
> + pages, ))
> goto slow;
> } while (pgdp++, addr = next, addr != end);
> local_irq_enable();
> @@ -289,7 +290,7 @@ int get_user_pages_fast(unsigned long start, int
> nr_pages, int write,
> pages += nr;
>
> ret = get_user_pages_unlocked(start, (end - start) >> PAGE_SHIFT,
> - pages, write ? FOLL_WRITE : 0);
> + pages, gup_flags);
>
> /* Have to be a bit careful with return values */
> if (nr > 0) {
> diff --git a/arch/powerpc/kvm/book3s_64_mmu_hv.c
> b/arch/powerpc/kvm/book3s_64_mmu_hv.c
> index bd2dcfbf00cd..8fcb0a921e46 100644
> --- a/arch/powerpc/kvm/book3s_64_mmu_hv.c
> +++
[RESEND PATCH 3/7] mm/gup: Change GUP fast to use flags rather than a write 'bool'
From: Ira Weiny
To facilitate additional options to get_user_pages_fast() change the
singular write parameter to be gup_flags.
This patch does not change any functionality. New functionality will
follow in subsequent patches.
Some of the get_user_pages_fast() call sites were unchanged because they
already passed FOLL_WRITE or 0 for the write parameter.
Signed-off-by: Ira Weiny
---
arch/mips/mm/gup.c | 11 ++-
arch/powerpc/kvm/book3s_64_mmu_hv.c| 4 ++--
arch/powerpc/kvm/e500_mmu.c| 2 +-
arch/powerpc/mm/mmu_context_iommu.c| 4 ++--
arch/s390/kvm/interrupt.c | 2 +-
arch/s390/mm/gup.c | 12 ++--
arch/sh/mm/gup.c | 11 ++-
arch/sparc/mm/gup.c| 9 +
arch/x86/kvm/paging_tmpl.h | 2 +-
arch/x86/kvm/svm.c | 2 +-
drivers/fpga/dfl-afu-dma-region.c | 2 +-
drivers/gpu/drm/via/via_dmablit.c | 3 ++-
drivers/infiniband/hw/hfi1/user_pages.c| 3 ++-
drivers/misc/genwqe/card_utils.c | 2 +-
drivers/misc/vmw_vmci/vmci_host.c | 2 +-
drivers/misc/vmw_vmci/vmci_queue_pair.c| 6 --
drivers/platform/goldfish/goldfish_pipe.c | 3 ++-
drivers/rapidio/devices/rio_mport_cdev.c | 4 +++-
drivers/sbus/char/oradax.c | 2 +-
drivers/scsi/st.c | 3 ++-
drivers/staging/gasket/gasket_page_table.c | 4 ++--
drivers/tee/tee_shm.c | 2 +-
drivers/vfio/vfio_iommu_spapr_tce.c| 3 ++-
drivers/vhost/vhost.c | 2 +-
drivers/video/fbdev/pvr2fb.c | 2 +-
drivers/virt/fsl_hypervisor.c | 2 +-
drivers/xen/gntdev.c | 2 +-
fs/orangefs/orangefs-bufmap.c | 2 +-
include/linux/mm.h | 4 ++--
kernel/futex.c | 2 +-
lib/iov_iter.c | 7 +--
mm/gup.c | 10 +-
mm/util.c | 8
net/ceph/pagevec.c | 2 +-
net/rds/info.c | 2 +-
net/rds/rdma.c | 3 ++-
36 files changed, 81 insertions(+), 65 deletions(-)
diff --git a/arch/mips/mm/gup.c b/arch/mips/mm/gup.c
index 0d14e0d8eacf..4c2b4483683c 100644
--- a/arch/mips/mm/gup.c
+++ b/arch/mips/mm/gup.c
@@ -235,7 +235,7 @@ int __get_user_pages_fast(unsigned long start, int
nr_pages, int write,
* get_user_pages_fast() - pin user pages in memory
* @start: starting user address
* @nr_pages: number of pages from start to pin
- * @write: whether pages will be written to
+ * @gup_flags: flags modifying pin behaviour
* @pages: array that receives pointers to the pages pinned.
* Should be at least nr_pages long.
*
@@ -247,8 +247,8 @@ int __get_user_pages_fast(unsigned long start, int
nr_pages, int write,
* requested. If nr_pages is 0 or negative, returns 0. If no pages
* were pinned, returns -errno.
*/
-int get_user_pages_fast(unsigned long start, int nr_pages, int write,
- struct page **pages)
+int get_user_pages_fast(unsigned long start, int nr_pages,
+ unsigned int gup_flags, struct page **pages)
{
struct mm_struct *mm = current->mm;
unsigned long addr, len, end;
@@ -273,7 +273,8 @@ int get_user_pages_fast(unsigned long start, int nr_pages,
int write,
next = pgd_addr_end(addr, end);
if (pgd_none(pgd))
goto slow;
- if (!gup_pud_range(pgd, addr, next, write, pages, ))
+ if (!gup_pud_range(pgd, addr, next, gup_flags & FOLL_WRITE,
+ pages, ))
goto slow;
} while (pgdp++, addr = next, addr != end);
local_irq_enable();
@@ -289,7 +290,7 @@ int get_user_pages_fast(unsigned long start, int nr_pages,
int write,
pages += nr;
ret = get_user_pages_unlocked(start, (end - start) >> PAGE_SHIFT,
- pages, write ? FOLL_WRITE : 0);
+ pages, gup_flags);
/* Have to be a bit careful with return values */
if (nr > 0) {
diff --git a/arch/powerpc/kvm/book3s_64_mmu_hv.c
b/arch/powerpc/kvm/book3s_64_mmu_hv.c
index bd2dcfbf00cd..8fcb0a921e46 100644
--- a/arch/powerpc/kvm/book3s_64_mmu_hv.c
+++ b/arch/powerpc/kvm/book3s_64_mmu_hv.c
@@ -582,7 +582,7 @@ int kvmppc_book3s_hv_page_fault(struct kvm_run *run, struct
kvm_vcpu *vcpu,
/* If writing != 0, then the HPTE must allow writing, if we get here */
write_ok = writing;
hva = gfn_to_hva_memslot(memslot, gfn);
- npages = get_user_pages_fast(hva, 1, writing, pages);
+ npages = get_user_pages_fast(hva, 1,
