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    Subject[tip:x86/mm] x86/mm/pat: Wrap pat_enabled into a function API
    Commit-ID:  cb32edf65bf2197a2d2226e94c7602dc92e295bb
    Gitweb: http://git.kernel.org/tip/cb32edf65bf2197a2d2226e94c7602dc92e295bb
    Author: Luis R. Rodriguez <mcgrof@suse.com>
    AuthorDate: Tue, 26 May 2015 10:28:15 +0200
    Committer: Ingo Molnar <mingo@kernel.org>
    CommitDate: Wed, 27 May 2015 14:41:01 +0200

    x86/mm/pat: Wrap pat_enabled into a function API

    We use pat_enabled in x86-specific code to see if PAT is enabled
    or not but we're granting full access to it even though readers
    do not need to set it. If, for instance, we granted access to it
    to modules later they then could override the variable
    setting... no bueno.

    This renames pat_enabled to a new static variable __pat_enabled.
    Folks are redirected to use pat_enabled() now.

    Code that sets this can only be internal to pat.c. Apart from
    the early kernel parameter "nopat" to disable PAT, we also have
    a few cases that disable it later and make use of a helper
    pat_disable(). It is wrapped under an ifdef but since that code
    cannot run unless PAT was enabled its not required to wrap it
    with ifdefs, unwrap that. Likewise, since "nopat" doesn't really
    change non-PAT systems just remove that ifdef as well.

    Although we could add and use an early_param_off(), these
    helpers don't use __read_mostly but we want to keep
    __read_mostly for __pat_enabled as this is a hot path -- upon
    boot, for instance, a simple guest may see ~4k accesses to
    pat_enabled(). Since __read_mostly early boot params are not
    that common we don't add a helper for them just yet.

    Signed-off-by: Luis R. Rodriguez <mcgrof@suse.com>
    Signed-off-by: Borislav Petkov <bp@suse.de>
    Cc: Andy Lutomirski <luto@amacapital.net>
    Cc: Andy Walls <awalls@md.metrocast.net>
    Cc: Bjorn Helgaas <bhelgaas@google.com>
    Cc: Borislav Petkov <bp@alien8.de>
    Cc: Brian Gerst <brgerst@gmail.com>
    Cc: Christoph Lameter <cl@linux.com>
    Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
    Cc: Dave Airlie <airlied@redhat.com>
    Cc: Denys Vlasenko <dvlasenk@redhat.com>
    Cc: Doug Ledford <dledford@redhat.com>
    Cc: H. Peter Anvin <hpa@zytor.com>
    Cc: Juergen Gross <jgross@suse.com>
    Cc: Kyle McMartin <kyle@kernel.org>
    Cc: Linus Torvalds <torvalds@linux-foundation.org>
    Cc: Michael S. Tsirkin <mst@redhat.com>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Cc: Thomas Gleixner <tglx@linutronix.de>
    Link: http://lkml.kernel.org/r/1430425520-22275-3-git-send-email-mcgrof@do-not-panic.com
    Link: http://lkml.kernel.org/r/1432628901-18044-13-git-send-email-bp@alien8.de
    Signed-off-by: Ingo Molnar <mingo@kernel.org>
    ---
    arch/x86/include/asm/pat.h | 7 +------
    arch/x86/kernel/cpu/mtrr/main.c | 2 +-
    arch/x86/mm/iomap_32.c | 2 +-
    arch/x86/mm/ioremap.c | 4 ++--
    arch/x86/mm/pageattr.c | 2 +-
    arch/x86/mm/pat.c | 33 +++++++++++++++------------------
    arch/x86/pci/i386.c | 6 +++---
    7 files changed, 24 insertions(+), 32 deletions(-)

    diff --git a/arch/x86/include/asm/pat.h b/arch/x86/include/asm/pat.h
    index 91bc4ba..cdcff7f 100644
    --- a/arch/x86/include/asm/pat.h
    +++ b/arch/x86/include/asm/pat.h
    @@ -4,12 +4,7 @@
    #include <linux/types.h>
    #include <asm/pgtable_types.h>

    -#ifdef CONFIG_X86_PAT
    -extern int pat_enabled;
    -#else
    -static const int pat_enabled;
    -#endif
    -
    +bool pat_enabled(void);
    extern void pat_init(void);
    void pat_init_cache_modes(void);

    diff --git a/arch/x86/kernel/cpu/mtrr/main.c b/arch/x86/kernel/cpu/mtrr/main.c
    index 383efb2..e7ed0d8 100644
    --- a/arch/x86/kernel/cpu/mtrr/main.c
    +++ b/arch/x86/kernel/cpu/mtrr/main.c
    @@ -558,7 +558,7 @@ int arch_phys_wc_add(unsigned long base, unsigned long size)
    {
    int ret;

    - if (pat_enabled || !mtrr_enabled())
    + if (pat_enabled() || !mtrr_enabled())
    return 0; /* Success! (We don't need to do anything.) */

    ret = mtrr_add(base, size, MTRR_TYPE_WRCOMB, true);
    diff --git a/arch/x86/mm/iomap_32.c b/arch/x86/mm/iomap_32.c
    index 9ca35fc..3a2ec87 100644
    --- a/arch/x86/mm/iomap_32.c
    +++ b/arch/x86/mm/iomap_32.c
    @@ -82,7 +82,7 @@ iomap_atomic_prot_pfn(unsigned long pfn, pgprot_t prot)
    * MTRR is UC or WC. UC_MINUS gets the real intention, of the
    * user, which is "WC if the MTRR is WC, UC if you can't do that."
    */
    - if (!pat_enabled && pgprot_val(prot) ==
    + if (!pat_enabled() && pgprot_val(prot) ==
    (__PAGE_KERNEL | cachemode2protval(_PAGE_CACHE_MODE_WC)))
    prot = __pgprot(__PAGE_KERNEL |
    cachemode2protval(_PAGE_CACHE_MODE_UC_MINUS));
    diff --git a/arch/x86/mm/ioremap.c b/arch/x86/mm/ioremap.c
    index a493bb8..82d63ed 100644
    --- a/arch/x86/mm/ioremap.c
    +++ b/arch/x86/mm/ioremap.c
    @@ -234,7 +234,7 @@ void __iomem *ioremap_nocache(resource_size_t phys_addr, unsigned long size)
    {
    /*
    * Ideally, this should be:
    - * pat_enabled ? _PAGE_CACHE_MODE_UC : _PAGE_CACHE_MODE_UC_MINUS;
    + * pat_enabled() ? _PAGE_CACHE_MODE_UC : _PAGE_CACHE_MODE_UC_MINUS;
    *
    * Till we fix all X drivers to use ioremap_wc(), we will use
    * UC MINUS. Drivers that are certain they need or can already
    @@ -292,7 +292,7 @@ EXPORT_SYMBOL_GPL(ioremap_uc);
    */
    void __iomem *ioremap_wc(resource_size_t phys_addr, unsigned long size)
    {
    - if (pat_enabled)
    + if (pat_enabled())
    return __ioremap_caller(phys_addr, size, _PAGE_CACHE_MODE_WC,
    __builtin_return_address(0));
    else
    diff --git a/arch/x86/mm/pageattr.c b/arch/x86/mm/pageattr.c
    index 397838e..70d221f 100644
    --- a/arch/x86/mm/pageattr.c
    +++ b/arch/x86/mm/pageattr.c
    @@ -1571,7 +1571,7 @@ int set_memory_wc(unsigned long addr, int numpages)
    {
    int ret;

    - if (!pat_enabled)
    + if (!pat_enabled())
    return set_memory_uc(addr, numpages);

    ret = reserve_memtype(__pa(addr), __pa(addr) + numpages * PAGE_SIZE,
    diff --git a/arch/x86/mm/pat.c b/arch/x86/mm/pat.c
    index 8c50b9b..484dce7 100644
    --- a/arch/x86/mm/pat.c
    +++ b/arch/x86/mm/pat.c
    @@ -36,12 +36,11 @@
    #undef pr_fmt
    #define pr_fmt(fmt) "" fmt

    -#ifdef CONFIG_X86_PAT
    -int __read_mostly pat_enabled = 1;
    +static int __read_mostly __pat_enabled = IS_ENABLED(CONFIG_X86_PAT);

    static inline void pat_disable(const char *reason)
    {
    - pat_enabled = 0;
    + __pat_enabled = 0;
    pr_info("x86/PAT: %s\n", reason);
    }

    @@ -51,13 +50,11 @@ static int __init nopat(char *str)
    return 0;
    }
    early_param("nopat", nopat);
    -#else
    -static inline void pat_disable(const char *reason)
    +
    +bool pat_enabled(void)
    {
    - (void)reason;
    + return !!__pat_enabled;
    }
    -#endif
    -

    int pat_debug_enable;

    @@ -201,7 +198,7 @@ void pat_init(void)
    u64 pat;
    bool boot_cpu = !boot_pat_state;

    - if (!pat_enabled)
    + if (!pat_enabled())
    return;

    if (!cpu_has_pat) {
    @@ -402,7 +399,7 @@ int reserve_memtype(u64 start, u64 end, enum page_cache_mode req_type,

    BUG_ON(start >= end); /* end is exclusive */

    - if (!pat_enabled) {
    + if (!pat_enabled()) {
    /* This is identical to page table setting without PAT */
    if (new_type) {
    if (req_type == _PAGE_CACHE_MODE_WC)
    @@ -477,7 +474,7 @@ int free_memtype(u64 start, u64 end)
    int is_range_ram;
    struct memtype *entry;

    - if (!pat_enabled)
    + if (!pat_enabled())
    return 0;

    /* Low ISA region is always mapped WB. No need to track */
    @@ -625,7 +622,7 @@ static inline int range_is_allowed(unsigned long pfn, unsigned long size)
    u64 to = from + size;
    u64 cursor = from;

    - if (!pat_enabled)
    + if (!pat_enabled())
    return 1;

    while (cursor < to) {
    @@ -661,7 +658,7 @@ int phys_mem_access_prot_allowed(struct file *file, unsigned long pfn,
    * caching for the high addresses through the KEN pin, but
    * we maintain the tradition of paranoia in this code.
    */
    - if (!pat_enabled &&
    + if (!pat_enabled() &&
    !(boot_cpu_has(X86_FEATURE_MTRR) ||
    boot_cpu_has(X86_FEATURE_K6_MTRR) ||
    boot_cpu_has(X86_FEATURE_CYRIX_ARR) ||
    @@ -730,7 +727,7 @@ static int reserve_pfn_range(u64 paddr, unsigned long size, pgprot_t *vma_prot,
    * the type requested matches the type of first page in the range.
    */
    if (is_ram) {
    - if (!pat_enabled)
    + if (!pat_enabled())
    return 0;

    pcm = lookup_memtype(paddr);
    @@ -844,7 +841,7 @@ int track_pfn_remap(struct vm_area_struct *vma, pgprot_t *prot,
    return ret;
    }

    - if (!pat_enabled)
    + if (!pat_enabled())
    return 0;

    /*
    @@ -872,7 +869,7 @@ int track_pfn_insert(struct vm_area_struct *vma, pgprot_t *prot,
    {
    enum page_cache_mode pcm;

    - if (!pat_enabled)
    + if (!pat_enabled())
    return 0;

    /* Set prot based on lookup */
    @@ -913,7 +910,7 @@ void untrack_pfn(struct vm_area_struct *vma, unsigned long pfn,

    pgprot_t pgprot_writecombine(pgprot_t prot)
    {
    - if (pat_enabled)
    + if (pat_enabled())
    return __pgprot(pgprot_val(prot) |
    cachemode2protval(_PAGE_CACHE_MODE_WC));
    else
    @@ -996,7 +993,7 @@ static const struct file_operations memtype_fops = {

    static int __init pat_memtype_list_init(void)
    {
    - if (pat_enabled) {
    + if (pat_enabled()) {
    debugfs_create_file("pat_memtype_list", S_IRUSR,
    arch_debugfs_dir, NULL, &memtype_fops);
    }
    diff --git a/arch/x86/pci/i386.c b/arch/x86/pci/i386.c
    index 349c0d3..0a9f2ca 100644
    --- a/arch/x86/pci/i386.c
    +++ b/arch/x86/pci/i386.c
    @@ -429,12 +429,12 @@ int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma,
    * Caller can followup with UC MINUS request and add a WC mtrr if there
    * is a free mtrr slot.
    */
    - if (!pat_enabled && write_combine)
    + if (!pat_enabled() && write_combine)
    return -EINVAL;

    - if (pat_enabled && write_combine)
    + if (pat_enabled() && write_combine)
    prot |= cachemode2protval(_PAGE_CACHE_MODE_WC);
    - else if (pat_enabled || boot_cpu_data.x86 > 3)
    + else if (pat_enabled() || boot_cpu_data.x86 > 3)
    /*
    * ioremap() and ioremap_nocache() defaults to UC MINUS for now.
    * To avoid attribute conflicts, request UC MINUS here

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