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Date: Mon, 12 Jan 2009 21:05:20 +0100
From: "Torsten Kaiser" <just.for.lkml@...glemail.com>
To: "Pallipadi, Venkatesh" <venkatesh.pallipadi@...el.com>
Cc: "Ingo Molnar" <mingo@...e.hu>,
"Linus Torvalds" <torvalds@...ux-foundation.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"Andrew Morton" <akpm@...ux-foundation.org>,
"Thomas Gleixner" <tglx@...utronix.de>,
"H. Peter Anvin" <hpa@...or.com>
Subject: Re: [git pull] x86 fixes
On Mon, Jan 12, 2009 at 8:29 PM, Pallipadi, Venkatesh
<venkatesh.pallipadi@...el.com> wrote:
> oops. I missed out one file in the earlier test patch. Below is the
> updated test patch that will go against 29-rc1.
>
> Thanks,
> Venki
>
> Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipad@...el.com>
Tested-by: Torsten Kaiser <just.for.lkml@...glemail.com>
The system boots normal and glxgears is accelerated again.
> ---
>
> Index: linux-2.6/arch/x86/mm/pat.c
> ===================================================================
> --- linux-2.6.orig/arch/x86/mm/pat.c 2009-01-12 10:45:03.000000000 -0800
> +++ linux-2.6/arch/x86/mm/pat.c 2009-01-12 11:06:43.000000000 -0800
> @@ -601,12 +601,13 @@ void unmap_devmem(unsigned long pfn, uns
> * Reserved non RAM regions only and after successful reserve_memtype,
> * this func also keeps identity mapping (if any) in sync with this new prot.
> */
> -static int reserve_pfn_range(u64 paddr, unsigned long size, pgprot_t vma_prot)
> +static int reserve_pfn_range(u64 paddr, unsigned long size, pgprot_t *vma_prot,
> + int strict_prot)
> {
> int is_ram = 0;
> int id_sz, ret;
> unsigned long flags;
> - unsigned long want_flags = (pgprot_val(vma_prot) & _PAGE_CACHE_MASK);
> + unsigned long want_flags = (pgprot_val(*vma_prot) & _PAGE_CACHE_MASK);
>
> is_ram = pagerange_is_ram(paddr, paddr + size);
>
> @@ -625,15 +626,29 @@ static int reserve_pfn_range(u64 paddr,
> return ret;
>
> if (flags != want_flags) {
> - free_memtype(paddr, paddr + size);
> - printk(KERN_ERR
> - "%s:%d map pfn expected mapping type %s for %Lx-%Lx, got %s\n",
> - current->comm, current->pid,
> - cattr_name(want_flags),
> - (unsigned long long)paddr,
> - (unsigned long long)(paddr + size),
> - cattr_name(flags));
> - return -EINVAL;
> + if (strict_prot ||
> + (want_flags == _PAGE_CACHE_UC_MINUS &&
> + flags == _PAGE_CACHE_WB) ||
> + (want_flags == _PAGE_CACHE_WC &&
> + flags == _PAGE_CACHE_WB)) {
> + free_memtype(paddr, paddr + size);
> + printk(KERN_ERR "%s:%d map pfn expected mapping type %s"
> + " for %Lx-%Lx, got %s\n",
> + current->comm, current->pid,
> + cattr_name(want_flags),
> + (unsigned long long)paddr,
> + (unsigned long long)(paddr + size),
> + cattr_name(flags));
> + return -EINVAL;
> + }
> + /*
> + * We allow returning different type than the one requested in
> + * non strict case.
> + */
> + *vma_prot = __pgprot((pgprot_val(*vma_prot) &
> + (~_PAGE_CACHE_MASK)) |
> + flags);
> +
> }
>
> /* Need to keep identity mapping in sync */
> @@ -689,6 +704,7 @@ int track_pfn_vma_copy(struct vm_area_st
> unsigned long vma_start = vma->vm_start;
> unsigned long vma_end = vma->vm_end;
> unsigned long vma_size = vma_end - vma_start;
> + pgprot_t pgprot;
>
> if (!pat_enabled)
> return 0;
> @@ -702,7 +718,8 @@ int track_pfn_vma_copy(struct vm_area_st
> WARN_ON_ONCE(1);
> return -EINVAL;
> }
> - return reserve_pfn_range(paddr, vma_size, __pgprot(prot));
> + pgprot = __pgprot(prot);
> + return reserve_pfn_range(paddr, vma_size, &pgprot, 1);
> }
>
> /* reserve entire vma page by page, using pfn and prot from pte */
> @@ -710,7 +727,8 @@ int track_pfn_vma_copy(struct vm_area_st
> if (follow_phys(vma, vma_start + i, 0, &prot, &paddr))
> continue;
>
> - retval = reserve_pfn_range(paddr, PAGE_SIZE, __pgprot(prot));
> + pgprot = __pgprot(prot);
> + retval = reserve_pfn_range(paddr, PAGE_SIZE, &pgprot, 1);
> if (retval)
> goto cleanup_ret;
> }
> @@ -741,7 +759,7 @@ cleanup_ret:
> * Note that this function can be called with caller trying to map only a
> * subrange/page inside the vma.
> */
> -int track_pfn_vma_new(struct vm_area_struct *vma, pgprot_t prot,
> +int track_pfn_vma_new(struct vm_area_struct *vma, pgprot_t *prot,
> unsigned long pfn, unsigned long size)
> {
> int retval = 0;
> @@ -758,14 +776,14 @@ int track_pfn_vma_new(struct vm_area_str
> if (is_linear_pfn_mapping(vma)) {
> /* reserve the whole chunk starting from vm_pgoff */
> paddr = (resource_size_t)vma->vm_pgoff << PAGE_SHIFT;
> - return reserve_pfn_range(paddr, vma_size, prot);
> + return reserve_pfn_range(paddr, vma_size, prot, 0);
> }
>
> /* reserve page by page using pfn and size */
> base_paddr = (resource_size_t)pfn << PAGE_SHIFT;
> for (i = 0; i < size; i += PAGE_SIZE) {
> paddr = base_paddr + i;
> - retval = reserve_pfn_range(paddr, PAGE_SIZE, prot);
> + retval = reserve_pfn_range(paddr, PAGE_SIZE, prot, 0);
> if (retval)
> goto cleanup_ret;
> }
> Index: linux-2.6/mm/memory.c
> ===================================================================
> --- linux-2.6.orig/mm/memory.c 2009-01-12 10:45:03.000000000 -0800
> +++ linux-2.6/mm/memory.c 2009-01-12 10:59:30.000000000 -0800
> @@ -1511,6 +1511,7 @@ int vm_insert_pfn(struct vm_area_struct
> unsigned long pfn)
> {
> int ret;
> + pgprot_t pgprot = vma->vm_page_prot;
> /*
> * Technically, architectures with pte_special can avoid all these
> * restrictions (same for remap_pfn_range). However we would like
> @@ -1525,10 +1526,10 @@ int vm_insert_pfn(struct vm_area_struct
>
> if (addr < vma->vm_start || addr >= vma->vm_end)
> return -EFAULT;
> - if (track_pfn_vma_new(vma, vma->vm_page_prot, pfn, PAGE_SIZE))
> + if (track_pfn_vma_new(vma, &pgprot, pfn, PAGE_SIZE))
> return -EINVAL;
>
> - ret = insert_pfn(vma, addr, pfn, vma->vm_page_prot);
> + ret = insert_pfn(vma, addr, pfn, pgprot);
>
> if (ret)
> untrack_pfn_vma(vma, pfn, PAGE_SIZE);
> @@ -1671,9 +1672,15 @@ int remap_pfn_range(struct vm_area_struc
>
> vma->vm_flags |= VM_IO | VM_RESERVED | VM_PFNMAP;
>
> - err = track_pfn_vma_new(vma, prot, pfn, PAGE_ALIGN(size));
> - if (err)
> + err = track_pfn_vma_new(vma, &prot, pfn, PAGE_ALIGN(size));
> + if (err) {
> + /*
> + * To indicate that track_pfn related cleanup is not
> + * needed from higher level routine calling unmap_vmas
> + */
> + vma->vm_flags &= ~(VM_IO | VM_RESERVED | VM_PFNMAP);
> return -EINVAL;
> + }
>
> BUG_ON(addr >= end);
> pfn -= addr >> PAGE_SHIFT;
> diff --git a/include/asm-generic/pgtable.h b/include/asm-generic/pgtable.h
> index 72ebe91..8e6d0ca 100644
> --- a/include/asm-generic/pgtable.h
> +++ b/include/asm-generic/pgtable.h
> @@ -301,7 +301,7 @@ static inline void ptep_modify_prot_commit(struct mm_struct *mm,
> * track_pfn_vma_new is called when a _new_ pfn mapping is being established
> * for physical range indicated by pfn and size.
> */
> -static inline int track_pfn_vma_new(struct vm_area_struct *vma, pgprot_t prot,
> +static inline int track_pfn_vma_new(struct vm_area_struct *vma, pgprot_t *prot,
> unsigned long pfn, unsigned long size)
> {
> return 0;
> @@ -332,7 +332,7 @@ static inline void untrack_pfn_vma(struct vm_area_struct *vma,
> {
> }
> #else
> -extern int track_pfn_vma_new(struct vm_area_struct *vma, pgprot_t prot,
> +extern int track_pfn_vma_new(struct vm_area_struct *vma, pgprot_t *prot,
> unsigned long pfn, unsigned long size);
> extern int track_pfn_vma_copy(struct vm_area_struct *vma);
> extern void untrack_pfn_vma(struct vm_area_struct *vma, unsigned long pfn,
>
--
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