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Date: Thu, 02 Oct 2014 16:44:57 +1000
From: Michael Neuling <mikey@...ling.org>
To: "Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
Cc: greg@...ah.com, arnd@...db.de, mpe@...erman.id.au,
benh@...nel.crashing.org, anton@...ba.org,
linux-kernel@...r.kernel.org, linuxppc-dev@...abs.org,
jk@...abs.org, imunsie@....ibm.com, cbe-oss-dev@...ts.ozlabs.org
Subject: Re: [PATCH v2 10/17] powerpc/mm: Merge vsid calculation in
hash_page() and copro_data_segment()
On Wed, 2014-10-01 at 15:25 +0530, Aneesh Kumar K.V wrote:
> Michael Neuling <mikey@...ling.org> writes:
>
> > From: Ian Munsie <imunsie@....ibm.com>
> >
> > The vsid calculation between hash_page() and copro_data_segment() are very
> > similar. This merges these two different versions.
> >
> > Signed-off-by: Ian Munsie <imunsie@....ibm.com>
> > Signed-off-by: Michael Neuling <mikey@...ling.org>
> > ---
> > arch/powerpc/include/asm/mmu-hash64.h | 2 ++
> > arch/powerpc/mm/copro_fault.c | 45 ++++++--------------------
> > arch/powerpc/mm/hash_utils_64.c | 61 ++++++++++++++++++++++-------------
> > 3 files changed, 50 insertions(+), 58 deletions(-)
> >
> > diff --git a/arch/powerpc/include/asm/mmu-hash64.h b/arch/powerpc/include/asm/mmu-hash64.h
> > index f84e5a5..bf43fb0 100644
> > --- a/arch/powerpc/include/asm/mmu-hash64.h
> > +++ b/arch/powerpc/include/asm/mmu-hash64.h
> > @@ -322,6 +322,8 @@ extern int __hash_page_64K(unsigned long ea, unsigned long access,
> > unsigned int local, int ssize);
> > struct mm_struct;
> > unsigned int hash_page_do_lazy_icache(unsigned int pp, pte_t pte, int trap);
> > +int calculate_vsid(struct mm_struct *mm, u64 ea,
> > + u64 *vsid, int *psize, int *ssize);
> > extern int hash_page_mm(struct mm_struct *mm, unsigned long ea, unsigned long access, unsigned long trap);
> > extern int hash_page(unsigned long ea, unsigned long access, unsigned long trap);
> > int __hash_page_huge(unsigned long ea, unsigned long access, unsigned long vsid,
> > diff --git a/arch/powerpc/mm/copro_fault.c b/arch/powerpc/mm/copro_fault.c
> > index 939abdf..ba8bf8e 100644
> > --- a/arch/powerpc/mm/copro_fault.c
> > +++ b/arch/powerpc/mm/copro_fault.c
> > @@ -94,45 +94,18 @@ EXPORT_SYMBOL_GPL(copro_handle_mm_fault);
> >
> > int copro_data_segment(struct mm_struct *mm, u64 ea, u64 *esid, u64 *vsid)
> > {
> > - int psize, ssize;
> > + int psize, ssize, rc;
> >
> > *esid = (ea & ESID_MASK) | SLB_ESID_V;
> >
> > - switch (REGION_ID(ea)) {
> > - case USER_REGION_ID:
> > - pr_devel("copro_data_segment: 0x%llx -- USER_REGION_ID\n", ea);
> > -#ifdef CONFIG_PPC_MM_SLICES
> > - psize = get_slice_psize(mm, ea);
> > -#else
> > - psize = mm->context.user_psize;
> > -#endif
> > - ssize = user_segment_size(ea);
> > - *vsid = (get_vsid(mm->context.id, ea, ssize)
> > - << slb_vsid_shift(ssize)) | SLB_VSID_USER;
> > - break;
> > - case VMALLOC_REGION_ID:
> > - pr_devel("copro_data_segment: 0x%llx -- VMALLOC_REGION_ID\n", ea);
> > - if (ea < VMALLOC_END)
> > - psize = mmu_vmalloc_psize;
> > - else
> > - psize = mmu_io_psize;
> > - ssize = mmu_kernel_ssize;
> > - *vsid = (get_kernel_vsid(ea, mmu_kernel_ssize)
> > - << SLB_VSID_SHIFT) | SLB_VSID_KERNEL;
> > - break;
> > - case KERNEL_REGION_ID:
> > - pr_devel("copro_data_segment: 0x%llx -- KERNEL_REGION_ID\n", ea);
> > - psize = mmu_linear_psize;
> > - ssize = mmu_kernel_ssize;
> > - *vsid = (get_kernel_vsid(ea, mmu_kernel_ssize)
> > - << SLB_VSID_SHIFT) | SLB_VSID_KERNEL;
> > - break;
> > - default:
> > - /* Future: support kernel segments so that drivers can use the
> > - * CoProcessors */
> > - pr_debug("invalid region access at %016llx\n", ea);
> > - return 1;
> > - }
> > + rc = calculate_vsid(mm, ea, vsid, &psize, &ssize);
> > + if (rc)
> > + return rc;
> > + if (REGION_ID(ea) == USER_REGION_ID)
> > + *vsid = (*vsid << slb_vsid_shift(ssize)) | SLB_VSID_USER;
> > + else
> > + *vsid = (*vsid << SLB_VSID_SHIFT) | SLB_VSID_KERNEL;
> > +
> > *vsid |= mmu_psize_defs[psize].sllp |
> > ((ssize == MMU_SEGSIZE_1T) ? SLB_VSID_B_1T : 0);
> >
> > diff --git a/arch/powerpc/mm/hash_utils_64.c b/arch/powerpc/mm/hash_utils_64.c
> > index 0a5c8c0..3fa81ca 100644
> > --- a/arch/powerpc/mm/hash_utils_64.c
> > +++ b/arch/powerpc/mm/hash_utils_64.c
> > @@ -983,6 +983,38 @@ static void check_paca_psize(unsigned long ea, struct mm_struct *mm,
> > }
> > }
> >
> > +int calculate_vsid(struct mm_struct *mm, u64 ea,
> > + u64 *vsid, int *psize, int *ssize)
> > +{
> > + switch (REGION_ID(ea)) {
> > + case USER_REGION_ID:
> > + pr_devel("%s: 0x%llx -- USER_REGION_ID\n", __func__, ea);
> > + *psize = get_slice_psize(mm, ea);
> > + *ssize = user_segment_size(ea);
> > + *vsid = get_vsid(mm->context.id, ea, *ssize);
> > + return 0;
> > + case VMALLOC_REGION_ID:
> > + pr_devel("%s: 0x%llx -- VMALLOC_REGION_ID\n", __func__, ea);
> > + if (ea < VMALLOC_END)
> > + *psize = mmu_vmalloc_psize;
> > + else
> > + *psize = mmu_io_psize;
> > + *ssize = mmu_kernel_ssize;
> > + *vsid = get_kernel_vsid(ea, mmu_kernel_ssize);
> > + return 0;
> > + case KERNEL_REGION_ID:
> > + pr_devel("%s: 0x%llx -- KERNEL_REGION_ID\n", __func__, ea);
> > + *psize = mmu_linear_psize;
> > + *ssize = mmu_kernel_ssize;
> > + *vsid = get_kernel_vsid(ea, mmu_kernel_ssize);
> > + return 0;
> > + default:
> > + pr_debug("%s: invalid region access at %016llx\n", __func__, ea);
> > + return 1;
> > + }
> > +}
> > +EXPORT_SYMBOL_GPL(calculate_vsid);
> > +
> > /* Result code is:
> > * 0 - handled
> > * 1 - normal page fault
> > @@ -993,7 +1025,7 @@ int hash_page_mm(struct mm_struct *mm, unsigned long ea, unsigned long access, u
> > {
> > enum ctx_state prev_state = exception_enter();
> > pgd_t *pgdir;
> > - unsigned long vsid;
> > + u64 vsid;
> > pte_t *ptep;
> > unsigned hugeshift;
> > const struct cpumask *tmp;
> > @@ -1003,35 +1035,20 @@ int hash_page_mm(struct mm_struct *mm, unsigned long ea, unsigned long access, u
> > DBG_LOW("%s(ea=%016lx, access=%lx, trap=%lx\n",
> > __func__, ea, access, trap);
> >
> > - /* Get region & vsid */
> > - switch (REGION_ID(ea)) {
> > - case USER_REGION_ID:
> > + /* Get region */
> > + if (REGION_ID(ea) == USER_REGION_ID) {
> > user_region = 1;
> > if (! mm) {
> > DBG_LOW(" user region with no mm !\n");
> > rc = 1;
> > goto bail;
> > }
> > - psize = get_slice_psize(mm, ea);
> > - ssize = user_segment_size(ea);
> > - vsid = get_vsid(mm->context.id, ea, ssize);
> > - break;
> > - case VMALLOC_REGION_ID:
> > + } else
> > mm = &init_mm;
> > - vsid = get_kernel_vsid(ea, mmu_kernel_ssize);
> > - if (ea < VMALLOC_END)
> > - psize = mmu_vmalloc_psize;
> > - else
> > - psize = mmu_io_psize;
> > - ssize = mmu_kernel_ssize;
> > - break;
> > - default:
> > - /* Not a valid range
> > - * Send the problem up to do_page_fault
> > - */
> > - rc = 1;
>
>
> That part is different now. We now handle kernel_region_id in case of
> hash_page. Earlier we used consider it a problem.
Yeah, that's going to be the kernel linear mapping. We should probably
continue to barf as we shouldn't fault on that. Thanks.
I'll fix.
Mikey
>
> > + rc = calculate_vsid(mm, ea, &vsid, &psize, &ssize);
> > + if (rc)
> > goto bail;
> > - }
> > +
> > DBG_LOW(" mm=%p, mm->pgdir=%p, vsid=%016lx\n", mm, mm->pgd, vsid);
> >
> > /* Bad address. */
> > --
> > 1.9.1
> >
> > --
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