1. 07 Jun, 2015 10 commits
    • Toshi Kani's avatar
      x86/mm/pat: Add pgprot_writethrough() · d1b4bfbf
      Toshi Kani authored
      Add pgprot_writethrough() for setting page protection flags to
      Write-Through mode.
      Signed-off-by: default avatarToshi Kani <toshi.kani@hp.com>
      Signed-off-by: default avatarBorislav Petkov <bp@suse.de>
      Cc: Andrew Morton <akpm@linux-foundation.org>
      Cc: Andy Lutomirski <luto@amacapital.net>
      Cc: Elliott@hp.com
      Cc: H. Peter Anvin <hpa@zytor.com>
      Cc: Linus Torvalds <torvalds@linux-foundation.org>
      Cc: Luis R. Rodriguez <mcgrof@suse.com>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: arnd@arndb.de
      Cc: hch@lst.de
      Cc: hmh@hmh.eng.br
      Cc: jgross@suse.com
      Cc: konrad.wilk@oracle.com
      Cc: linux-mm <linux-mm@kvack.org>
      Cc: linux-nvdimm@lists.01.org
      Cc: stefan.bader@canonical.com
      Cc: yigal@plexistor.com
      Link: http://lkml.kernel.org/r/1433436928-31903-11-git-send-email-bp@alien8.deSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
      d1b4bfbf
    • Toshi Kani's avatar
      video/fbdev, asm/io.h: Remove ioremap_writethrough() · c7c95f19
      Toshi Kani authored
      Replace all calls to ioremap_writethrough() with ioremap_wt().
      Remove ioremap_writethrough() too.
      Signed-off-by: default avatarToshi Kani <toshi.kani@hp.com>
      Signed-off-by: default avatarBorislav Petkov <bp@suse.de>
      Acked-by: default avatarGeert Uytterhoeven <geert@linux-m68k.org>
      Cc: Andrew Morton <akpm@linux-foundation.org>
      Cc: Andy Lutomirski <luto@amacapital.net>
      Cc: Elliott@hp.com
      Cc: H. Peter Anvin <hpa@zytor.com>
      Cc: Linus Torvalds <torvalds@linux-foundation.org>
      Cc: Luis R. Rodriguez <mcgrof@suse.com>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: arnd@arndb.de
      Cc: hch@lst.de
      Cc: hmh@hmh.eng.br
      Cc: jgross@suse.com
      Cc: konrad.wilk@oracle.com
      Cc: linux-mm <linux-mm@kvack.org>
      Cc: linux-nvdimm@lists.01.org
      Cc: stefan.bader@canonical.com
      Cc: yigal@plexistor.com
      Link: http://lkml.kernel.org/r/1433436928-31903-10-git-send-email-bp@alien8.deSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
      c7c95f19
    • Toshi Kani's avatar
      arch/*/io.h: Add ioremap_wt() to all architectures · 556269c1
      Toshi Kani authored
      Add ioremap_wt() to all arch-specific asm/io.h headers which
      define ioremap_wc() locally. These headers do not include
      <asm-generic/iomap.h>. Some of them include <asm-generic/io.h>,
      but ioremap_wt() is defined for consistency since they define
      all ioremap_xxx locally.
      
      In all architectures without Write-Through support, ioremap_wt()
      is defined indentical to ioremap_nocache().
      
      frv and m68k already have ioremap_writethrough(). On those we
      add ioremap_wt() indetical to ioremap_writethrough() and defines
      ARCH_HAS_IOREMAP_WT in both architectures.
      
      The ioremap_wt() interface is exported to drivers.
      Signed-off-by: default avatarToshi Kani <toshi.kani@hp.com>
      Signed-off-by: default avatarBorislav Petkov <bp@suse.de>
      Cc: Andrew Morton <akpm@linux-foundation.org>
      Cc: Andy Lutomirski <luto@amacapital.net>
      Cc: Elliott@hp.com
      Cc: H. Peter Anvin <hpa@zytor.com>
      Cc: Linus Torvalds <torvalds@linux-foundation.org>
      Cc: Luis R. Rodriguez <mcgrof@suse.com>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: arnd@arndb.de
      Cc: hch@lst.de
      Cc: hmh@hmh.eng.br
      Cc: jgross@suse.com
      Cc: konrad.wilk@oracle.com
      Cc: linux-mm <linux-mm@kvack.org>
      Cc: linux-nvdimm@lists.01.org
      Cc: stefan.bader@canonical.com
      Cc: yigal@plexistor.com
      Link: http://lkml.kernel.org/r/1433436928-31903-9-git-send-email-bp@alien8.deSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
      556269c1
    • Toshi Kani's avatar
      x86/mm, asm-generic: Add ioremap_wt() for creating Write-Through mappings · d838270e
      Toshi Kani authored
      Add ioremap_wt() for creating Write-Through mappings on x86. It
      follows the same model as ioremap_wc() for multi-arch support.
      Define ARCH_HAS_IOREMAP_WT in the x86 version of io.h to
      indicate that ioremap_wt() is implemented on x86.
      
      Also update the PAT documentation file to cover ioremap_wt().
      Signed-off-by: default avatarToshi Kani <toshi.kani@hp.com>
      Signed-off-by: default avatarBorislav Petkov <bp@suse.de>
      Cc: Andrew Morton <akpm@linux-foundation.org>
      Cc: Andy Lutomirski <luto@amacapital.net>
      Cc: Elliott@hp.com
      Cc: H. Peter Anvin <hpa@zytor.com>
      Cc: Linus Torvalds <torvalds@linux-foundation.org>
      Cc: Luis R. Rodriguez <mcgrof@suse.com>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: arnd@arndb.de
      Cc: hch@lst.de
      Cc: hmh@hmh.eng.br
      Cc: jgross@suse.com
      Cc: konrad.wilk@oracle.com
      Cc: linux-mm <linux-mm@kvack.org>
      Cc: linux-nvdimm@lists.01.org
      Cc: stefan.bader@canonical.com
      Cc: yigal@plexistor.com
      Link: http://lkml.kernel.org/r/1433436928-31903-8-git-send-email-bp@alien8.deSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
      d838270e
    • Toshi Kani's avatar
      x86/mm: Teach is_new_memtype_allowed() about Write-Through type · ecb2feba
      Toshi Kani authored
      __ioremap_caller() calls reserve_memtype() and the passed down
      @new_pcm contains the actual page cache type it reserved in the
      success case.
      
      is_new_memtype_allowed() verifies if converting to the new page
      cache type is allowed when @pcm (the requested type) is
      different from @new_pcm.
      
      When WT is requested, the caller expects that writes are ordered
      and uncached. Therefore, enhance is_new_memtype_allowed() to
      disallow the following cases:
      
       - If the request is WT, mapping type cannot be WB
       - If the request is WT, mapping type cannot be WC
      Signed-off-by: default avatarToshi Kani <toshi.kani@hp.com>
      Signed-off-by: default avatarBorislav Petkov <bp@suse.de>
      Reviewed-by: default avatarThomas Gleixner <tglx@linutronix.de>
      Cc: Andrew Morton <akpm@linux-foundation.org>
      Cc: Andy Lutomirski <luto@amacapital.net>
      Cc: Elliott@hp.com
      Cc: H. Peter Anvin <hpa@zytor.com>
      Cc: Linus Torvalds <torvalds@linux-foundation.org>
      Cc: Luis R. Rodriguez <mcgrof@suse.com>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: arnd@arndb.de
      Cc: hch@lst.de
      Cc: hmh@hmh.eng.br
      Cc: jgross@suse.com
      Cc: konrad.wilk@oracle.com
      Cc: linux-mm <linux-mm@kvack.org>
      Cc: linux-nvdimm@lists.01.org
      Cc: stefan.bader@canonical.com
      Cc: yigal@plexistor.com
      Link: http://lkml.kernel.org/r/1433436928-31903-7-git-send-email-bp@alien8.deSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
      ecb2feba
    • Toshi Kani's avatar
      x86/mm/pat: Change reserve_memtype() for Write-Through type · 0d69bdff
      Toshi Kani authored
      When a target range is in RAM, reserve_ram_pages_type() verifies
      the requested type. Change it to fail WT and WP requests with
      -EINVAL since set_page_memtype() is limited to handle three
      types: WB, WC and UC-.
      Signed-off-by: default avatarToshi Kani <toshi.kani@hp.com>
      Signed-off-by: default avatarBorislav Petkov <bp@suse.de>
      Cc: Andrew Morton <akpm@linux-foundation.org>
      Cc: Andy Lutomirski <luto@amacapital.net>
      Cc: Elliott@hp.com
      Cc: H. Peter Anvin <hpa@zytor.com>
      Cc: Linus Torvalds <torvalds@linux-foundation.org>
      Cc: Luis R. Rodriguez <mcgrof@suse.com>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: arnd@arndb.de
      Cc: hch@lst.de
      Cc: hmh@hmh.eng.br
      Cc: jgross@suse.com
      Cc: konrad.wilk@oracle.com
      Cc: linux-mm <linux-mm@kvack.org>
      Cc: linux-nvdimm@lists.01.org
      Cc: stefan.bader@canonical.com
      Cc: yigal@plexistor.com
      Link: http://lkml.kernel.org/r/1433436928-31903-6-git-send-email-bp@alien8.deSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
      0d69bdff
    • Toshi Kani's avatar
      x86/mm/pat: Use 7th PAT MSR slot for Write-Through PAT type · d79a40ca
      Toshi Kani authored
      Assign Write-Through type to the PA7 slot in the PAT MSR when
      the processor is not affected by PAT errata. The PA7 slot is
      chosen to improve robustness in the presence of errata that
      might cause the high PAT bit to be ignored. This way a buggy PA7
      slot access will hit the PA3 slot, which is UC, so at worst we
      lose performance without causing a correctness issue.
      
      The following Intel processors are affected by the PAT errata.
      
        Errata               CPUID
        ----------------------------------------------------
        Pentium 2, A52       family 0x6, model 0x5
        Pentium 3, E27       family 0x6, model 0x7, 0x8
        Pentium 3 Xenon, G26 family 0x6, model 0x7, 0x8, 0xa
        Pentium M, Y26       family 0x6, model 0x9
        Pentium M 90nm, X9   family 0x6, model 0xd
        Pentium 4, N46       family 0xf, model 0x0
      
      Instead of making sharp boundary checks, we remain conservative
      and exclude all Pentium 2, 3, M and 4 family processors. For
      those, _PAGE_CACHE_MODE_WT is redirected to UC- per the default
      setup in __cachemode2pte_tbl[].
      Signed-off-by: default avatarToshi Kani <toshi.kani@hp.com>
      Signed-off-by: default avatarBorislav Petkov <bp@suse.de>
      Cc: Andrew Morton <akpm@linux-foundation.org>
      Cc: Andy Lutomirski <luto@amacapital.net>
      Cc: Elliott@hp.com
      Cc: H. Peter Anvin <hpa@zytor.com>
      Cc: Linus Torvalds <torvalds@linux-foundation.org>
      Cc: Luis R. Rodriguez <mcgrof@suse.com>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: arnd@arndb.de
      Cc: hch@lst.de
      Cc: hmh@hmh.eng.br
      Cc: jgross@suse.com
      Cc: konrad.wilk@oracle.com
      Cc: linux-mm <linux-mm@kvack.org>
      Cc: linux-nvdimm@lists.01.org
      Cc: stefan.bader@canonical.com
      Cc: yigal@plexistor.com
      Link: https://lkml.kernel.org/r/1433187393-22688-2-git-send-email-toshi.kani@hp.comSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
      d79a40ca
    • Borislav Petkov's avatar
      x86/mm/pat: Remove pat_enabled() checks · 7202fdb1
      Borislav Petkov authored
      Now that we emulate a PAT table when PAT is disabled, there's no
      need for those checks anymore as the PAT abstraction will handle
      those cases too.
      
      Based on a conglomerate patch from Toshi Kani.
      Signed-off-by: default avatarBorislav Petkov <bp@suse.de>
      Reviewed-by: default avatarToshi Kani <toshi.kani@hp.com>
      Cc: Andrew Morton <akpm@linux-foundation.org>
      Cc: Andy Lutomirski <luto@amacapital.net>
      Cc: Elliott@hp.com
      Cc: H. Peter Anvin <hpa@zytor.com>
      Cc: Linus Torvalds <torvalds@linux-foundation.org>
      Cc: Luis R. Rodriguez <mcgrof@suse.com>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: arnd@arndb.de
      Cc: hch@lst.de
      Cc: hmh@hmh.eng.br
      Cc: jgross@suse.com
      Cc: konrad.wilk@oracle.com
      Cc: linux-mm <linux-mm@kvack.org>
      Cc: linux-nvdimm@lists.01.org
      Cc: stefan.bader@canonical.com
      Cc: yigal@plexistor.com
      Link: http://lkml.kernel.org/r/1433436928-31903-4-git-send-email-bp@alien8.deSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
      7202fdb1
    • Borislav Petkov's avatar
      x86/mm/pat: Emulate PAT when it is disabled · 9cd25aac
      Borislav Petkov authored
      In the case when PAT is disabled on the command line with
      "nopat" or when virtualization doesn't support PAT (correctly) -
      see
      
        9d34cfdf ("x86: Don't rely on VMWare emulating PAT MSR correctly").
      
      we emulate it using the PWT and PCD cache attribute bits. Get
      rid of boot_pat_state while at it.
      
      Based on a conglomerate patch from Toshi Kani.
      Signed-off-by: default avatarBorislav Petkov <bp@suse.de>
      Reviewed-by: default avatarToshi Kani <toshi.kani@hp.com>
      Acked-by: default avatarJuergen Gross <jgross@suse.com>
      Cc: Andrew Morton <akpm@linux-foundation.org>
      Cc: Andy Lutomirski <luto@amacapital.net>
      Cc: Elliott@hp.com
      Cc: H. Peter Anvin <hpa@zytor.com>
      Cc: Linus Torvalds <torvalds@linux-foundation.org>
      Cc: Luis R. Rodriguez <mcgrof@suse.com>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: arnd@arndb.de
      Cc: hch@lst.de
      Cc: hmh@hmh.eng.br
      Cc: konrad.wilk@oracle.com
      Cc: linux-mm <linux-mm@kvack.org>
      Cc: linux-nvdimm@lists.01.org
      Cc: stefan.bader@canonical.com
      Cc: yigal@plexistor.com
      Link: http://lkml.kernel.org/r/1433436928-31903-3-git-send-email-bp@alien8.deSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
      9cd25aac
    • Borislav Petkov's avatar
      x86/mm/pat: Untangle pat_init() · 9dac6290
      Borislav Petkov authored
      Split it into a BSP and AP version which makes the PAT
      initialization path actually readable again.
      Signed-off-by: default avatarBorislav Petkov <bp@suse.de>
      Reviewed-by: default avatarToshi Kani <toshi.kani@hp.com>
      Cc: Andrew Morton <akpm@linux-foundation.org>
      Cc: Andy Lutomirski <luto@amacapital.net>
      Cc: Elliott@hp.com
      Cc: H. Peter Anvin <hpa@zytor.com>
      Cc: Linus Torvalds <torvalds@linux-foundation.org>
      Cc: Luis R. Rodriguez <mcgrof@suse.com>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: arnd@arndb.de
      Cc: hch@lst.de
      Cc: hmh@hmh.eng.br
      Cc: jgross@suse.com
      Cc: konrad.wilk@oracle.com
      Cc: linux-mm <linux-mm@kvack.org>
      Cc: linux-nvdimm@lists.01.org
      Cc: stefan.bader@canonical.com
      Cc: yigal@plexistor.com
      Link: http://lkml.kernel.org/r/1433436928-31903-2-git-send-email-bp@alien8.deSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
      9dac6290
  2. 03 Jun, 2015 1 commit
    • Stephen Rothwell's avatar
      x86/mm: Decouple <linux/vmalloc.h> from <asm/io.h> · d6472302
      Stephen Rothwell authored
      Nothing in <asm/io.h> uses anything from <linux/vmalloc.h>, so
      remove it from there and fix up the resulting build problems
      triggered on x86 {64|32}-bit {def|allmod|allno}configs.
      
      The breakages were triggering in places where x86 builds relied
      on vmalloc() facilities but did not include <linux/vmalloc.h>
      explicitly and relied on the implicit inclusion via <asm/io.h>.
      
      Also add:
      
        - <linux/init.h> to <linux/io.h>
        - <asm/pgtable_types> to <asm/io.h>
      
      ... which were two other implicit header file dependencies.
      Suggested-by: default avatarDavid Miller <davem@davemloft.net>
      Signed-off-by: default avatarStephen Rothwell <sfr@canb.auug.org.au>
      [ Tidied up the changelog. ]
      Acked-by: default avatarDavid Miller <davem@davemloft.net>
      Acked-by: default avatarTakashi Iwai <tiwai@suse.de>
      Acked-by: default avatarViresh Kumar <viresh.kumar@linaro.org>
      Acked-by: default avatarVinod Koul <vinod.koul@intel.com>
      Cc: Andrew Morton <akpm@linux-foundation.org>
      Cc: Anton Vorontsov <anton@enomsg.org>
      Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
      Cc: Colin Cross <ccross@android.com>
      Cc: David Vrabel <david.vrabel@citrix.com>
      Cc: H. Peter Anvin <hpa@zytor.com>
      Cc: Haiyang Zhang <haiyangz@microsoft.com>
      Cc: James E.J. Bottomley <JBottomley@odin.com>
      Cc: Jaroslav Kysela <perex@perex.cz>
      Cc: K. Y. Srinivasan <kys@microsoft.com>
      Cc: Kees Cook <keescook@chromium.org>
      Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
      Cc: Kristen Carlson Accardi <kristen@linux.intel.com>
      Cc: Len Brown <lenb@kernel.org>
      Cc: Linus Torvalds <torvalds@linux-foundation.org>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Rafael J. Wysocki <rjw@rjwysocki.net>
      Cc: Suma Ramars <sramars@cisco.com>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: Tony Luck <tony.luck@intel.com>
      Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
      d6472302
  3. 28 May, 2015 1 commit
  4. 27 May, 2015 13 commits
    • Luis R. Rodriguez's avatar
      x86/mm/pat: Export pat_enabled() · fbe7193a
      Luis R. Rodriguez authored
      Two Linux device drivers cannot work with PAT and the work
      required to make them work is significant. There is not enough
      motivation to convert these drivers over to use PAT properly,
      the compromise reached is to let drivers that cannot be ported
      to PAT check if PAT was enabled and if so fail on probe with a
      recommendation to boot with the "nopat" kernel parameter.
      Signed-off-by: default avatarLuis R. Rodriguez <mcgrof@suse.com>
      Signed-off-by: default avatarBorislav 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: 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: 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/1430425520-22275-4-git-send-email-mcgrof@do-not-panic.com
      Link: http://lkml.kernel.org/r/1432628901-18044-14-git-send-email-bp@alien8.deSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
      fbe7193a
    • Luis R. Rodriguez's avatar
      x86/mm/pat: Wrap pat_enabled into a function API · cb32edf6
      Luis R. Rodriguez authored
      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: default avatarLuis R. Rodriguez <mcgrof@suse.com>
      Signed-off-by: default avatarBorislav 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.deSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
      cb32edf6
    • Luis R. Rodriguez's avatar
      x86/mm/mtrr: Generalize runtime disabling of MTRRs · f9626104
      Luis R. Rodriguez authored
      It is possible to enable CONFIG_MTRR and CONFIG_X86_PAT and end
      up with a system with MTRR functionality disabled but PAT
      functionality enabled. This can happen, for instance, when the
      Xen hypervisor is used where MTRRs are not supported but PAT is.
      This can happen on Linux as of commit
      
        47591df5 ("xen: Support Xen pv-domains using PAT")
      
      by Juergen, introduced in v3.19.
      
      Technically, we should assume the proper CPU bits would be set
      to disable MTRRs but we can't always rely on this. At least on
      the Xen Hypervisor, for instance, only X86_FEATURE_MTRR was
      disabled as of Xen 4.4 through Xen commit 586ab6a [0], but not
      X86_FEATURE_K6_MTRR, X86_FEATURE_CENTAUR_MCR, or
      X86_FEATURE_CYRIX_ARR for instance.
      
      Roger Pau Monné has clarified though that although this is
      technically true we will never support PVH on these CPU types so
      Xen has no need to disable these bits on those systems. As per
      Roger, AMD K6, Centaur and VIA chips don't have the necessary
      hardware extensions to allow running PVH guests [1].
      
      As per Toshi it is also possible for the BIOS to disable MTRR
      support, in such cases get_mtrr_state() would update the MTRR
      state as per the BIOS, we need to propagate this information as
      well.
      
      x86 MTRR code relies on quite a bit of checks for mtrr_if being
      set to check to see if MTRRs did get set up. Instead, lets
      provide a generic getter for that. This also adds a few checks
      where they were not before which could potentially safeguard
      ourselves against incorrect usage of MTRR where this was not
      desirable.
      
      Where possible match error codes as if MTRRs were disabled on
      arch/x86/include/asm/mtrr.h.
      
      Lastly, since disabling MTRRs can happen at run time and we
      could end up with PAT enabled, best record now in our logs when
      MTRRs are disabled.
      
      [0] ~/devel/xen (git::stable-4.5)$ git describe --contains 586ab6a 4.4.0-rc1~18
      [1] http://lists.xenproject.org/archives/html/xen-devel/2015-03/msg03460.htmlSigned-off-by: default avatarLuis R. Rodriguez <mcgrof@suse.com>
      Signed-off-by: default avatarBorislav Petkov <bp@suse.de>
      Cc: Andy Lutomirski <luto@amacapital.net>
      Cc: Antonino Daplas <adaplas@gmail.com>
      Cc: Borislav Petkov <bp@alien8.de>
      Cc: Brian Gerst <brgerst@gmail.com>
      Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
      Cc: Dave Airlie <airlied@redhat.com>
      Cc: Dave Hansen <dave.hansen@linux.intel.com>
      Cc: Davidlohr Bueso <dbueso@suse.de>
      Cc: Denys Vlasenko <dvlasenk@redhat.com>
      Cc: H. Peter Anvin <hpa@zytor.com>
      Cc: Jean-Christophe Plagniol-Villard <plagnioj@jcrosoft.com>
      Cc: Juergen Gross <jgross@suse.com>
      Cc: Linus Torvalds <torvalds@linux-foundation.org>
      Cc: Mel Gorman <mgorman@suse.de>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Roger Pau Monné <roger.pau@citrix.com>
      Cc: Stefan Bader <stefan.bader@canonical.com>
      Cc: Suresh Siddha <sbsiddha@gmail.com>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: Tomi Valkeinen <tomi.valkeinen@ti.com>
      Cc: Toshi Kani <toshi.kani@hp.com>
      Cc: Ville Syrjälä <syrjala@sci.fi>
      Cc: Vlastimil Babka <vbabka@suse.cz>
      Cc: bhelgaas@google.com
      Cc: david.vrabel@citrix.com
      Cc: jbeulich@suse.com
      Cc: konrad.wilk@oracle.com
      Cc: venkatesh.pallipadi@intel.com
      Cc: ville.syrjala@linux.intel.com
      Cc: xen-devel@lists.xensource.com
      Link: http://lkml.kernel.org/r/1426893517-2511-3-git-send-email-mcgrof@do-not-panic.com
      Link: http://lkml.kernel.org/r/1432628901-18044-12-git-send-email-bp@alien8.deSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
      f9626104
    • Luis R. Rodriguez's avatar
      x86/mm/mtrr: Avoid #ifdeffery with phys_wc_to_mtrr_index() · 7d010fdf
      Luis R. Rodriguez authored
      There is only one user but since we're going to bury MTRR next
      out of access to drivers, expose this last piece of API to
      drivers in a general fashion only needing io.h for access to
      helpers.
      Signed-off-by: default avatarLuis R. Rodriguez <mcgrof@suse.com>
      Signed-off-by: default avatarBorislav Petkov <bp@suse.de>
      Cc: Abhilash Kesavan <a.kesavan@samsung.com>
      Cc: Andrew Morton <akpm@linux-foundation.org>
      Cc: Andy Lutomirski <luto@amacapital.net>
      Cc: Antonino Daplas <adaplas@gmail.com>
      Cc: Borislav Petkov <bp@alien8.de>
      Cc: Brian Gerst <brgerst@gmail.com>
      Cc: Catalin Marinas <catalin.marinas@arm.com>
      Cc: Cristian Stoica <cristian.stoica@freescale.com>
      Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
      Cc: Dave Airlie <airlied@redhat.com>
      Cc: Dave Hansen <dave.hansen@linux.intel.com>
      Cc: Davidlohr Bueso <dbueso@suse.de>
      Cc: Denys Vlasenko <dvlasenk@redhat.com>
      Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
      Cc: H. Peter Anvin <hpa@zytor.com>
      Cc: Jean-Christophe Plagniol-Villard <plagnioj@jcrosoft.com>
      Cc: Juergen Gross <jgross@suse.com>
      Cc: Linus Torvalds <torvalds@linux-foundation.org>
      Cc: Matthias Brugger <matthias.bgg@gmail.com>
      Cc: Mel Gorman <mgorman@suse.de>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Suresh Siddha <sbsiddha@gmail.com>
      Cc: Thierry Reding <treding@nvidia.com>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: Tomi Valkeinen <tomi.valkeinen@ti.com>
      Cc: Toshi Kani <toshi.kani@hp.com>
      Cc: Ville Syrjälä <syrjala@sci.fi>
      Cc: Vlastimil Babka <vbabka@suse.cz>
      Cc: Will Deacon <will.deacon@arm.com>
      Cc: dri-devel@lists.freedesktop.org
      Link: http://lkml.kernel.org/r/1429722736-4473-1-git-send-email-mcgrof@do-not-panic.com
      Link: http://lkml.kernel.org/r/1432628901-18044-11-git-send-email-bp@alien8.deSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
      7d010fdf
    • Luis R. Rodriguez's avatar
      x86/mm/mtrr, pat: Document Write Combining MTRR type effects on PAT / non-PAT pages · 2f9e8973
      Luis R. Rodriguez authored
      As part of the effort to phase out MTRR use document
      write-combining MTRR effects on pages with different non-PAT
      page attributes flags and different PAT entry values. Extend
      arch_phys_wc_add() documentation to clarify power of two sizes /
      boundary requirements as we phase out mtrr_add() use.
      
      Lastly hint towards ioremap_uc() for corner cases on device
      drivers working with devices with mixed regions where MTRR size
      requirements would otherwise not enable write-combining
      effective memory types.
      Signed-off-by: default avatarLuis R. Rodriguez <mcgrof@suse.com>
      Signed-off-by: default avatarBorislav Petkov <bp@suse.de>
      Cc: Andy Lutomirski <luto@amacapital.net>
      Cc: Antonino Daplas <adaplas@gmail.com>
      Cc: Borislav Petkov <bp@alien8.de>
      Cc: Brian Gerst <brgerst@gmail.com>
      Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
      Cc: Dave Airlie <airlied@redhat.com>
      Cc: Dave Hansen <dave.hansen@linux.intel.com>
      Cc: Davidlohr Bueso <dbueso@suse.de>
      Cc: Denys Vlasenko <dvlasenk@redhat.com>
      Cc: H. Peter Anvin <hpa@zytor.com>
      Cc: Jean-Christophe Plagniol-Villard <plagnioj@jcrosoft.com>
      Cc: Jonathan Corbet <corbet@lwn.net>
      Cc: Juergen Gross <jgross@suse.com>
      Cc: Linus Torvalds <torvalds@linux-foundation.org>
      Cc: Mel Gorman <mgorman@suse.de>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Suresh Siddha <sbsiddha@gmail.com>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: Tomi Valkeinen <tomi.valkeinen@ti.com>
      Cc: Ville Syrjälä <syrjala@sci.fi>
      Cc: Vlastimil Babka <vbabka@suse.cz>
      Cc: linux-fbdev@vger.kernel.org
      Link: http://lkml.kernel.org/r/1430343851-967-3-git-send-email-mcgrof@do-not-panic.com
      Link: http://lkml.kernel.org/r/1432628901-18044-10-git-send-email-bp@alien8.deSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
      2f9e8973
    • Luis R. Rodriguez's avatar
      x86/mm/pat: Convert to pr_*() usage · 9e76561f
      Luis R. Rodriguez authored
      Use pr_info() instead of the old printk to prefix the component
      where things are coming from. With this readers will know
      exactly where the message is coming from. We use pr_* helpers
      but define pr_fmt to the empty string for easier grepping for
      those error messages.
      
      We leave the users of dprintk() in place, this will print only
      when the debugpat kernel parameter is enabled. We want to leave
      those enabled as a debug feature, but also make them use the
      same prefix.
      Signed-off-by: default avatarLuis R. Rodriguez <mcgrof@suse.com>
      [ Kill pr_fmt. ]
      Signed-off-by: default avatarBorislav 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: 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: 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>
      Cc: cocci@systeme.lip6.fr
      Cc: plagnioj@jcrosoft.com
      Cc: tomi.valkeinen@ti.com
      Link: http://lkml.kernel.org/r/1430425520-22275-2-git-send-email-mcgrof@do-not-panic.com
      Link: http://lkml.kernel.org/r/1432628901-18044-9-git-send-email-bp@alien8.deSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
      9e76561f
    • Toshi Kani's avatar
      x86/mm/mtrr: Enhance MTRR checks in kernel mapping helpers · b73522e0
      Toshi Kani authored
      This patch adds the argument 'uniform' to mtrr_type_lookup(),
      which gets set to 1 when a given range is covered uniformly by
      MTRRs, i.e. the range is fully covered by a single MTRR entry or
      the default type.
      
      Change pud_set_huge() and pmd_set_huge() to honor the 'uniform'
      flag to see if it is safe to create a huge page mapping in the
      range.
      
      This allows them to create a huge page mapping in a range
      covered by a single MTRR entry of any memory type. It also
      detects a non-optimal request properly. They continue to check
      with the WB type since it does not effectively change the
      uniform mapping even if a request spans multiple MTRR entries.
      
      pmd_set_huge() logs a warning message to a non-optimal request
      so that driver writers will be aware of such a case. Drivers
      should make a mapping request aligned to a single MTRR entry
      when the range is covered by MTRRs.
      Signed-off-by: default avatarToshi Kani <toshi.kani@hp.com>
      [ Realign, flesh out comments, improve warning message. ]
      Signed-off-by: default avatarBorislav Petkov <bp@suse.de>
      Cc: Andrew Morton <akpm@linux-foundation.org>
      Cc: Andy Lutomirski <luto@amacapital.net>
      Cc: Borislav Petkov <bp@alien8.de>
      Cc: Brian Gerst <brgerst@gmail.com>
      Cc: Denys Vlasenko <dvlasenk@redhat.com>
      Cc: Elliott@hp.com
      Cc: H. Peter Anvin <hpa@zytor.com>
      Cc: Linus Torvalds <torvalds@linux-foundation.org>
      Cc: Luis R. Rodriguez <mcgrof@suse.com>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: dave.hansen@intel.com
      Cc: linux-mm <linux-mm@kvack.org>
      Cc: pebolle@tiscali.nl
      Link: http://lkml.kernel.org/r/1431714237-880-7-git-send-email-toshi.kani@hp.com
      Link: http://lkml.kernel.org/r/1432628901-18044-8-git-send-email-bp@alien8.deSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
      b73522e0
    • Toshi Kani's avatar
      x86/mm/mtrr: Clean up mtrr_type_lookup() · 0cc705f5
      Toshi Kani authored
      MTRRs contain fixed and variable entries. mtrr_type_lookup() may
      repeatedly call __mtrr_type_lookup() to handle a request that
      overlaps with variable entries.
      
      However, __mtrr_type_lookup() also handles the fixed entries,
      which do not have to be repeated. Therefore, this patch creates
      separate functions, mtrr_type_lookup_fixed() and
      mtrr_type_lookup_variable(), to handle the fixed and variable
      ranges respectively.
      
      The patch also updates the function headers to clarify the
      return values and output argument. It updates comments to
      clarify that the repeating is necessary to handle overlaps with
      the default type, since overlaps with multiple entries alone can
      be handled without such repeating.
      
      There is no functional change in this patch.
      Signed-off-by: default avatarToshi Kani <toshi.kani@hp.com>
      Signed-off-by: default avatarBorislav Petkov <bp@suse.de>
      Cc: Andrew Morton <akpm@linux-foundation.org>
      Cc: Andy Lutomirski <luto@amacapital.net>
      Cc: Borislav Petkov <bp@alien8.de>
      Cc: Brian Gerst <brgerst@gmail.com>
      Cc: Denys Vlasenko <dvlasenk@redhat.com>
      Cc: Elliott@hp.com
      Cc: H. Peter Anvin <hpa@zytor.com>
      Cc: Linus Torvalds <torvalds@linux-foundation.org>
      Cc: Luis R. Rodriguez <mcgrof@suse.com>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: dave.hansen@intel.com
      Cc: linux-mm <linux-mm@kvack.org>
      Cc: pebolle@tiscali.nl
      Link: http://lkml.kernel.org/r/1431714237-880-6-git-send-email-toshi.kani@hp.com
      Link: http://lkml.kernel.org/r/1432628901-18044-6-git-send-email-bp@alien8.deSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
      0cc705f5
    • Toshi Kani's avatar
      x86/mm/mtrr: Use symbolic define as a retval for disabled MTRRs · 3d3ca416
      Toshi Kani authored
      mtrr_type_lookup() returns verbatim 0xFF when MTRRs are
      disabled. This patch defines MTRR_TYPE_INVALID to clarify the
      meaning of this value, and documents its usage.
      
      Document the return values of the kernel virtual address mapping
      helpers pud_set_huge(), pmd_set_huge, pud_clear_huge() and
      pmd_clear_huge().
      
      There is no functional change in this patch.
      Signed-off-by: default avatarToshi Kani <toshi.kani@hp.com>
      Signed-off-by: default avatarBorislav Petkov <bp@suse.de>
      Cc: Andrew Morton <akpm@linux-foundation.org>
      Cc: Andy Lutomirski <luto@amacapital.net>
      Cc: Borislav Petkov <bp@alien8.de>
      Cc: Brian Gerst <brgerst@gmail.com>
      Cc: Denys Vlasenko <dvlasenk@redhat.com>
      Cc: Elliott@hp.com
      Cc: H. Peter Anvin <hpa@zytor.com>
      Cc: Linus Torvalds <torvalds@linux-foundation.org>
      Cc: Luis R. Rodriguez <mcgrof@suse.com>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: dave.hansen@intel.com
      Cc: linux-mm <linux-mm@kvack.org>
      Cc: pebolle@tiscali.nl
      Link: http://lkml.kernel.org/r/1431714237-880-5-git-send-email-toshi.kani@hp.com
      Link: http://lkml.kernel.org/r/1432628901-18044-5-git-send-email-bp@alien8.deSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
      3d3ca416
    • Toshi Kani's avatar
      x86/mm/mtrr: Fix MTRR state checks in mtrr_type_lookup() · 9b3aca62
      Toshi Kani authored
      'mtrr_state.enabled' contains the FE (fixed MTRRs enabled)
      and E (MTRRs enabled) flags in MSR_MTRRdefType.  Intel SDM,
      section 11.11.2.1, defines these flags as follows:
      
       - All MTRRs are disabled when the E flag is clear.
         The FE flag has no affect when the E flag is clear.
       - The default type is enabled when the E flag is set.
       - MTRR variable ranges are enabled when the E flag is set.
       - MTRR fixed ranges are enabled when both E and FE flags
         are set.
      
      MTRR state checks in __mtrr_type_lookup() do not match with SDM.
      
      Hence, this patch makes the following changes:
       - The current code detects MTRRs disabled when both E and
         FE flags are clear in mtrr_state.enabled.  Fix to detect
         MTRRs disabled when the E flag is clear.
       - The current code does not check if the FE bit is set in
         mtrr_state.enabled when looking at the fixed entries.
         Fix to check the FE flag.
       - The current code returns the default type when the E flag
         is clear in mtrr_state.enabled. However, the default type
         is UC when the E flag is clear.  Remove the code as this
         case is handled as MTRR disabled with the 1st change.
      
      In addition, this patch defines the E and FE flags in
      mtrr_state.enabled as follows.
       - FE flag: MTRR_STATE_MTRR_FIXED_ENABLED
       - E  flag: MTRR_STATE_MTRR_ENABLED
      
      print_mtrr_state() and x86_get_mtrr_mem_range() are also updated
      accordingly.
      Signed-off-by: default avatarToshi Kani <toshi.kani@hp.com>
      Signed-off-by: default avatarBorislav Petkov <bp@suse.de>
      Cc: Andrew Morton <akpm@linux-foundation.org>
      Cc: Andy Lutomirski <luto@amacapital.net>
      Cc: Borislav Petkov <bp@alien8.de>
      Cc: Brian Gerst <brgerst@gmail.com>
      Cc: Denys Vlasenko <dvlasenk@redhat.com>
      Cc: Elliott@hp.com
      Cc: H. Peter Anvin <hpa@zytor.com>
      Cc: Linus Torvalds <torvalds@linux-foundation.org>
      Cc: Luis R. Rodriguez <mcgrof@suse.com>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: dave.hansen@intel.com
      Cc: linux-mm <linux-mm@kvack.org>
      Cc: pebolle@tiscali.nl
      Link: http://lkml.kernel.org/r/1431714237-880-4-git-send-email-toshi.kani@hp.com
      Link: http://lkml.kernel.org/r/1432628901-18044-4-git-send-email-bp@alien8.deSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
      9b3aca62
    • Toshi Kani's avatar
      x86/mm/mtrr: Fix MTRR lookup to handle an inclusive entry · 7f0431e3
      Toshi Kani authored
      When an MTRR entry is inclusive to a requested range, i.e. the
      start and end of the request are not within the MTRR entry range
      but the range contains the MTRR entry entirely:
      
        range_start ... [mtrr_start ... mtrr_end] ... range_end
      
      __mtrr_type_lookup() ignores such a case because both
      start_state and end_state are set to zero.
      
      This bug can cause the following issues:
      
      1) reserve_memtype() tracks an effective memory type in case
         a request type is WB (ex. /dev/mem blindly uses WB). Missing
         to track with its effective type causes a subsequent request
         to map the same range with the effective type to fail.
      
      2) pud_set_huge() and pmd_set_huge() check if a requested range
         has any overlap with MTRRs. Missing to detect an overlap may
         cause a performance penalty or undefined behavior.
      
      This patch fixes the bug by adding a new flag, 'inclusive',
      to detect the inclusive case.  This case is then handled in
      the same way as end_state:1 since the first region is the same.
      With this fix, __mtrr_type_lookup() handles the inclusive case
      properly.
      Signed-off-by: default avatarToshi Kani <toshi.kani@hp.com>
      Signed-off-by: default avatarBorislav Petkov <bp@suse.de>
      Cc: Andrew Morton <akpm@linux-foundation.org>
      Cc: Andy Lutomirski <luto@amacapital.net>
      Cc: Borislav Petkov <bp@alien8.de>
      Cc: Brian Gerst <brgerst@gmail.com>
      Cc: Denys Vlasenko <dvlasenk@redhat.com>
      Cc: Elliott@hp.com
      Cc: H. Peter Anvin <hpa@zytor.com>
      Cc: Linus Torvalds <torvalds@linux-foundation.org>
      Cc: Luis R. Rodriguez <mcgrof@suse.com>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: dave.hansen@intel.com
      Cc: linux-mm <linux-mm@kvack.org>
      Cc: pebolle@tiscali.nl
      Link: http://lkml.kernel.org/r/1431714237-880-3-git-send-email-toshi.kani@hp.com
      Link: http://lkml.kernel.org/r/1432628901-18044-3-git-send-email-bp@alien8.deSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
      7f0431e3
    • Toshi Kani's avatar
      x86/mm/kconfig: Simplify conditions for HAVE_ARCH_HUGE_VMAP · 10455f64
      Toshi Kani authored
      Simplify the conditions selecting HAVE_ARCH_HUGE_VMAP since
      X86_PAE depends on X86_32 already.
      Signed-off-by: default avatarToshi Kani <toshi.kani@hp.com>
      Signed-off-by: default avatarBorislav Petkov <bp@suse.de>
      Cc: Andrew Morton <akpm@linux-foundation.org>
      Cc: Andy Lutomirski <luto@amacapital.net>
      Cc: Borislav Petkov <bp@alien8.de>
      Cc: Brian Gerst <brgerst@gmail.com>
      Cc: Denys Vlasenko <dvlasenk@redhat.com>
      Cc: Elliott@hp.com
      Cc: H. Peter Anvin <hpa@zytor.com>
      Cc: Linus Torvalds <torvalds@linux-foundation.org>
      Cc: Luis R. Rodriguez <mcgrof@suse.com>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: dave.hansen@intel.com
      Cc: linux-mm <linux-mm@kvack.org>
      Cc: pebolle@tiscali.nl
      Link: http://lkml.kernel.org/r/1431714237-880-2-git-send-email-toshi.kani@hp.com
      Link: http://lkml.kernel.org/r/1432628901-18044-2-git-send-email-bp@alien8.deSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
      10455f64
    • Ingo Molnar's avatar
  5. 25 May, 2015 1 commit
  6. 24 May, 2015 3 commits
  7. 23 May, 2015 3 commits
    • Linus Torvalds's avatar
      Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client · 086e8ddb
      Linus Torvalds authored
      Pull two Ceph fixes from Sage Weil:
       "These fix an issue with the RBD notifications when there are topology
        changes in the cluster"
      
      * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client:
        Revert "libceph: clear r_req_lru_item in __unregister_linger_request()"
        libceph: request a new osdmap if lingering request maps to no osd
      086e8ddb
    • Linus Torvalds's avatar
      Merge branch 'for-linus-4.1' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs · 7ce14f6f
      Linus Torvalds authored
      Pull btrfs fixes from Chris Mason:
       "I fixed up a regression from 4.0 where conversion between different
        raid levels would sometimes bail out without converting.
      
        Filipe tracked down a race where it was possible to double allocate
        chunks on the drive.
      
        Mark has a fix for fiemap.  All three will get bundled off for stable
        as well"
      
      * 'for-linus-4.1' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs:
        Btrfs: fix regression in raid level conversion
        Btrfs: fix racy system chunk allocation when setting block group ro
        btrfs: clear 'ret' in btrfs_check_shared() loop
      7ce14f6f
    • Linus Torvalds's avatar
      Merge branch 'drm-fixes' of git://people.freedesktop.org/~airlied/linux · cf539cbd
      Linus Torvalds authored
      Pull drm fixes from Dave Airlie:
       "Radeon has two displayport fixes, one for a regression.
      
        i915 regression flicker fix needed so 4.0 can get fixed.
      
        A bunch of msm fixes and a bunch of exynos fixes, these two are
        probably a bit larger than I'd like, but most of them seems pretty
        good"
      
      * 'drm-fixes' of git://people.freedesktop.org/~airlied/linux: (29 commits)
        drm/radeon: fix error flag checking in native aux path
        drm/radeon: retry dcpd fetch
        drm/msm/mdp5: fix incorrect parameter for msm_framebuffer_iova()
        drm/exynos: dp: Lower level of EDID read success message
        drm/exynos: cleanup exynos_drm_plane
        drm/exynos: 'win' is always unsigned
        drm/exynos: mixer: don't dump registers under spinlock
        drm/exynos: Consolidate return statements in fimd_bind()
        drm/exynos: Constify exynos_drm_crtc_ops
        drm/exynos: Fix build breakage on !DRM_EXYNOS_FIMD
        drm/exynos: mixer: Constify platform_device_id
        drm/exynos: mixer: cleanup pixelformat handling
        drm/exynos: mixer: also allow NV21 for the video processor
        drm/exynos: mixer: remove buffer count handling in vp_video_buffer()
        drm/exynos: plane: honor buffer offset for dma_addr
        drm/exynos: fb: use drm_format_num_planes to get buffer count
        drm/i915: fix screen flickering
        drm/msm: fix locking inconsistencies in gpu->destroy()
        drm/msm/dsi: Simplify the code to get the number of read byte
        drm/msm: Attach assigned encoder to eDP and DSI connectors
        ...
      cf539cbd
  8. 22 May, 2015 8 commits
    • Linus Torvalds's avatar
      Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net · 0b6280c6
      Linus Torvalds authored
      Pull networking fixes from David Miller:
      
       1) Don't leak ipvs->sysctl_tbl, from Tommi Rentala.
      
       2) Fix neighbour table entry leak in rocker driver, from Ying Xue.
      
       3) Do not emit bonding notifications for unregistered interfaces, from
          Nicolas Dichtel.
      
       4) Set ipv6 flow label properly when in TIME_WAIT state, from Florent
          Fourcot.
      
       5) Fix regression in ipv6 multicast filter test, from Henning Rogge.
      
       6) do_replace() in various footables netfilter modules is missing a
          check for 0 counters in the datastructure provided by the user.  Fix
          from Dave Jones, and found with trinity.
      
       7) Fix RCU bug in packet scheduler classifier module unloads, from
          Daniel Borkmann.
      
       8) Avoid deadlock in tcp_get_info() by using u64_sync.  From Eric
          Dumzaet.
      
       9) Input packet processing can race with inetdev_destroy() teardown,
          fix potential OOPS in ip_error() by explicitly testing whether the
          inetdev is still attached.  From Eric W Biederman.
      
      10) MLDv2 parser in bridge multicast code breaks too early while
          parsing.  Fix from Thadeu Lima de Souza Cascardo.
      
      11) Asking for settings on non-zero PHYID doesn't work because we do not
          import the command structure from the user and use the PHYID
          provided there.  Fix from Arun Parameswaran.
      
      12) Fix UDP checksums with IPV6 RAW sockets, from Vlad Yasevich.
      
      13) Missing NF_TABLES depends for TPROXY etc can cause build failures,
          fix from Florian Westphal.
      
      14) Fix netfilter conntrack to handle RFC5961 challenge ACKs properly,
          from Jesper Dangaard Brouer.
      
      15) If netlink autobind retry fails, we have to reset the sockets portid
          back to zero.  From Herbert Xu.
      
      16) VXLAN netns exit code unregisters using wrong device, from John W
          Linville.
      
      17) Add some USB device IDs to ath3k and btusb bluetooth drivers, from
          Dmitry Tunin and Wen-chien Jesse Sung.
      
      * git://git.kernel.org/pub/scm/linux/kernel/git/davem/net: (44 commits)
        bridge: fix lockdep splat
        net: core: 'ethtool' issue with querying phy settings
        bridge: fix parsing of MLDv2 reports
        ARM: zynq: DT: Use the zynq binding with macb
        net: macb: Disable half duplex gigabit on Zynq
        net: macb: Document zynq gem dt binding
        ipv4: fill in table id when replacing a route
        cdc_ncm: Fix tx_bytes statistics
        ipv4: Avoid crashing in ip_error
        tcp: fix a potential deadlock in tcp_get_info()
        net: sched: fix call_rcu() race on classifier module unloads
        net: phy: Make sure phy_start() always re-enables the phy interrupts
        ipv6: fix ECMP route replacement
        ipv6: do not delete previously existing ECMP routes if add fails
        Revert "netfilter: bridge: query conntrack about skb dnat"
        netfilter: ensure number of counters is >0 in do_replace()
        netfilter: nfnetlink_{log,queue}: Register pernet in first place
        tcp: don't over-send F-RTO probes
        tcp: only undo on partial ACKs in CA_Loss
        net/ipv6/udp: Fix ipv6 multicast socket filter regression
        ...
      0b6280c6
    • Linus Torvalds's avatar
      Merge branch 'for-linus' of git://git.kernel.dk/linux-block · 1c8df7bd
      Linus Torvalds authored
      Pull block fixes from Jens Axboe:
       "Three small fixes that have been picked up the last few weeks.
        Specifically:
      
         - Fix a memory corruption issue in NVMe with malignant user
           constructed request.  From Christoph.
      
         - Kill (now) unused blk_queue_bio(), dm was changed to not need this
           anymore.  From Mike Snitzer.
      
         - Always use blk_schedule_flush_plug() from the io_schedule() path
           when flushing a plug, fixing a !TASK_RUNNING warning with md.  From
           Shaohua"
      
      * 'for-linus' of git://git.kernel.dk/linux-block:
        sched: always use blk_schedule_flush_plug in io_schedule_out
        nvme: fix kernel memory corruption with short INQUIRY buffers
        block: remove export for blk_queue_bio
      1c8df7bd
    • Linus Torvalds's avatar
      Merge tag 'md/4.1-rc4-fixes' of git://neil.brown.name/md · a30ec4b3
      Linus Torvalds authored
      Pull md bugfixes from Neil Brown:
       "I have a few more raid5 bugfixes pending, but I want them to get a bit
        more review first.  In the meantime:
      
         - one serious RAID0 data corruption - caused by recent bugfix that
           wasn't reviewed properly.
      
         - one raid5 fix in new code (a couple more of those to come).
      
         - one little fix to stop static analysis complaining about silly rcu
           annotation"
      
      * tag 'md/4.1-rc4-fixes' of git://neil.brown.name/md:
        md/bitmap: remove rcu annotation from pointer arithmetic.
        md/raid0: fix restore to sector variable in raid0_make_request
        raid5: fix broken async operation chain
      a30ec4b3
    • Linus Torvalds's avatar
      Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input · 1d82b0ba
      Linus Torvalds authored
      Pull input fixes from Dmitry Torokhov:
       "Updates for the input subsystem.
      
        The main change is that we tell joydev not to touch "absolute mice",
        such as VMware virtual mouse, as that produced bad result (cursor
        stuck in upper right corner) with games"
      
      * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input:
        Input: smtpe-ts - wait 50mS until polling for pen-up
        Input: smtpe-ts - use msecs_to_jiffies() instead of HZ
        Input: joydev - don't classify the vmmouse as a joystick
        Input: vmmouse - do not reference non-existing version of X driver
        Input: alps - fix finger jumps on lifting 2 fingers on v7 touchpad
        Input: elantech - fix semi-mt protocol for v3 HW
        Input: sx8654 - fix memory allocation check
      1d82b0ba
    • Linus Torvalds's avatar
      Merge git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6 · 2a058f38
      Linus Torvalds authored
      Pull another crypto fix from Herbert Xu:
       "Fix ICV corruption in s390/ghash when the same tfm is used by more
        than one thread"
      
      * git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6:
        crypto: s390/ghash - Fix incorrect ghash icv buffer handling.
      2a058f38
    • Eric Dumazet's avatar
      bridge: fix lockdep splat · 93a33a58
      Eric Dumazet authored
      Following lockdep splat was reported :
      
      [   29.382286] ===============================
      [   29.382315] [ INFO: suspicious RCU usage. ]
      [   29.382344] 4.1.0-0.rc0.git11.1.fc23.x86_64 #1 Not tainted
      [   29.382380] -------------------------------
      [   29.382409] net/bridge/br_private.h:626 suspicious
      rcu_dereference_check() usage!
      [   29.382455]
                     other info that might help us debug this:
      
      [   29.382507]
                     rcu_scheduler_active = 1, debug_locks = 0
      [   29.382549] 2 locks held by swapper/0/0:
      [   29.382576]  #0:  (((&p->forward_delay_timer))){+.-...}, at:
      [<ffffffff81139f75>] call_timer_fn+0x5/0x4f0
      [   29.382660]  #1:  (&(&br->lock)->rlock){+.-...}, at:
      [<ffffffffa0450dc1>] br_forward_delay_timer_expired+0x31/0x140
      [bridge]
      [   29.382754]
                     stack backtrace:
      [   29.382787] CPU: 0 PID: 0 Comm: swapper/0 Not tainted
      4.1.0-0.rc0.git11.1.fc23.x86_64 #1
      [   29.382838] Hardware name: LENOVO 422916G/LENOVO, BIOS A1KT53AUS 04/07/2015
      [   29.382882]  0000000000000000 3ebfc20364115825 ffff880666603c48
      ffffffff81892d4b
      [   29.382943]  0000000000000000 ffffffff81e124e0 ffff880666603c78
      ffffffff8110bcd7
      [   29.383004]  ffff8800785c9d00 ffff88065485ac58 ffff880c62002800
      ffff880c5fc88ac0
      [   29.383065] Call Trace:
      [   29.383084]  <IRQ>  [<ffffffff81892d4b>] dump_stack+0x4c/0x65
      [   29.383130]  [<ffffffff8110bcd7>] lockdep_rcu_suspicious+0xe7/0x120
      [   29.383178]  [<ffffffffa04520f9>] br_fill_ifinfo+0x4a9/0x6a0 [bridge]
      [   29.383225]  [<ffffffffa045266b>] br_ifinfo_notify+0x11b/0x4b0 [bridge]
      [   29.383271]  [<ffffffffa0450d90>] ? br_hold_timer_expired+0x70/0x70 [bridge]
      [   29.383320]  [<ffffffffa0450de8>]
      br_forward_delay_timer_expired+0x58/0x140 [bridge]
      [   29.383371]  [<ffffffffa0450d90>] ? br_hold_timer_expired+0x70/0x70 [bridge]
      [   29.383416]  [<ffffffff8113a033>] call_timer_fn+0xc3/0x4f0
      [   29.383454]  [<ffffffff81139f75>] ? call_timer_fn+0x5/0x4f0
      [   29.383493]  [<ffffffff8110a90f>] ? lock_release_holdtime.part.29+0xf/0x200
      [   29.383541]  [<ffffffffa0450d90>] ? br_hold_timer_expired+0x70/0x70 [bridge]
      [   29.383587]  [<ffffffff8113a6a4>] run_timer_softirq+0x244/0x490
      [   29.383629]  [<ffffffff810b68cc>] __do_softirq+0xec/0x670
      [   29.383666]  [<ffffffff810b70d5>] irq_exit+0x145/0x150
      [   29.383703]  [<ffffffff8189f506>] smp_apic_timer_interrupt+0x46/0x60
      [   29.383744]  [<ffffffff8189d523>] apic_timer_interrupt+0x73/0x80
      [   29.383782]  <EOI>  [<ffffffff816f131f>] ? cpuidle_enter_state+0x5f/0x2f0
      [   29.383832]  [<ffffffff816f131b>] ? cpuidle_enter_state+0x5b/0x2f0
      
      Problem here is that br_forward_delay_timer_expired() is a timer
      handler, calling br_ifinfo_notify() which assumes either rcu_read_lock()
      or RTNL are held.
      
      Simplest fix seems to add rcu read lock section.
      Signed-off-by: default avatarEric Dumazet <edumazet@google.com>
      Reported-by: default avatarJosh Boyer <jwboyer@fedoraproject.org>
      Reported-by: default avatarDominick Grift <dac.override@gmail.com>
      Cc: Vlad Yasevich <vyasevich@gmail.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      93a33a58
    • Arun Parameswaran's avatar
      net: core: 'ethtool' issue with querying phy settings · f96dee13
      Arun Parameswaran authored
      When trying to configure the settings for PHY1, using commands
      like 'ethtool -s eth0 phyad 1 speed 100', the 'ethtool' seems to
      modify other settings apart from the speed of the PHY1, in the
      above case.
      
      The ethtool seems to query the settings for PHY0, and use this
      as the base to apply the new settings to the PHY1. This is
      causing the other settings of the PHY 1 to be wrongly
      configured.
      
      The issue is caused by the '_ethtool_get_settings()' API, which
      gets called because of the 'ETHTOOL_GSET' command, is clearing
      the 'cmd' pointer (of type 'struct ethtool_cmd') by calling
      memset. This clears all the parameters (if any) passed for the
      'ETHTOOL_GSET' cmd. So the driver's callback is always invoked
      with 'cmd->phy_address' as '0'.
      
      The '_ethtool_get_settings()' is called from other files in the
      'net/core'. So the fix is applied to the 'ethtool_get_settings()'
      which is only called in the context of the 'ethtool'.
      Signed-off-by: default avatarArun Parameswaran <aparames@broadcom.com>
      Reviewed-by: default avatarRay Jui <rjui@broadcom.com>
      Reviewed-by: default avatarScott Branden <sbranden@broadcom.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      f96dee13
    • Thadeu Lima de Souza Cascardo's avatar
      bridge: fix parsing of MLDv2 reports · 47cc84ce
      Thadeu Lima de Souza Cascardo authored
      When more than a multicast address is present in a MLDv2 report, all but
      the first address is ignored, because the code breaks out of the loop if
      there has not been an error adding that address.
      
      This has caused failures when two guests connected through the bridge
      tried to communicate using IPv6. Neighbor discoveries would not be
      transmitted to the other guest when both used a link-local address and a
      static address.
      
      This only happens when there is a MLDv2 querier in the network.
      
      The fix will only break out of the loop when there is a failure adding a
      multicast address.
      
      The mdb before the patch:
      
      dev ovirtmgmt port vnet0 grp ff02::1:ff7d:6603 temp
      dev ovirtmgmt port vnet1 grp ff02::1:ff7d:6604 temp
      dev ovirtmgmt port bond0.86 grp ff02::2 temp
      
      After the patch:
      
      dev ovirtmgmt port vnet0 grp ff02::1:ff7d:6603 temp
      dev ovirtmgmt port vnet1 grp ff02::1:ff7d:6604 temp
      dev ovirtmgmt port bond0.86 grp ff02::fb temp
      dev ovirtmgmt port bond0.86 grp ff02::2 temp
      dev ovirtmgmt port bond0.86 grp ff02::d temp
      dev ovirtmgmt port vnet0 grp ff02::1:ff00:76 temp
      dev ovirtmgmt port bond0.86 grp ff02::16 temp
      dev ovirtmgmt port vnet1 grp ff02::1:ff00:77 temp
      dev ovirtmgmt port bond0.86 grp ff02::1:ff00:def temp
      dev ovirtmgmt port bond0.86 grp ff02::1:ffa1:40bf temp
      
      Fixes: 08b202b6 ("bridge br_multicast: IPv6 MLD support.")
      Reported-by: default avatarRik Theys <Rik.Theys@esat.kuleuven.be>
      Signed-off-by: default avatarThadeu Lima de Souza Cascardo <cascardo@redhat.com>
      Tested-by: default avatarRik Theys <Rik.Theys@esat.kuleuven.be>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      47cc84ce