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    • Dave Airlie's avatar
      Merge tag 'drm-intel-fixes-2016-06-30' of git://anongit.freedesktop.org/drm-intel into drm-fixes · 88c08710
      Dave Airlie authored 
      here's a batch of i915 fixes for 4.7.

* tag 'drm-intel-fixes-2016-06-30' of git://anongit.freedesktop.org/drm-intel:
  drm/i915: Fix missing unlock on error in i915_ppgtt_info()
  drm/i915: Removing PCI IDs that are no longer listed as Kabylake.
  drm/i915: Add more Kabylake PCI IDs.
  drm/i915: Avoid early timeout during AUX transfers
  drm/i915/hsw: Avoid early timeout during LCPLL disable/restore
  drm/i915/lpt: Avoid early timeout during FDI PHY reset
  drm/i915/bxt: Avoid early timeout during PLL enable
  drm/i915: Refresh cached DP port register value on resume
      88c08710
    • Dave Airlie's avatar
      Merge branch 'drm-fixes-4.7' of git://people.freedesktop.org/~agd5f/linux into drm-fixes · 40793e85
      Dave Airlie authored 
      Just a few more late fixes for Polaris cards.

* 'drm-fixes-4.7' of git://people.freedesktop.org/~agd5f/linux:
  drm/amd/powerplay: workaround for UVD clock issue
  drm/amdgpu: add ACLK_CNTL setting for polaris10
  drm/amd/powerplay: fix issue uvd dpm can't enabled on Polaris11.
  drm/amd/powerplay: Workaround for Memory EDC Error on Polaris10.
  drm/amd/powerplay: Update CKS on/ CKS off voltage offset calculation
  drm/amd/powerplay: disable FFC.
  drm/amd/powerplay: add some definition for FFC feature on polaris.
      40793e85
    • Ralf Baechle's avatar
      MIPS: Fix possible corruption of cache mode by mprotect. · 6d037de9
      Ralf Baechle authored 
      The following testcase may result in a page table entries with a invalid
CCA field being generated:

static void *bindstack;

static int sysrqfd;

static void protect_low(int protect)
{
	mprotect(bindstack, BINDSTACK_SIZE, protect);
}

static void sigbus_handler(int signal, siginfo_t * info, void *context)
{
	void *addr = info->si_addr;

	write(sysrqfd, "x", 1);

	printf("sigbus, fault address %p (should not happen, but might)\n",
	       addr);
	abort();
}

static void run_bind_test(void)
{
	unsigned int *p = bindstack;

	p[0] = 0xf001f001;

	write(sysrqfd, "x", 1);

	/* Set trap on access to p[0] */
	protect_low(PROT_NONE);

	write(sysrqfd, "x", 1);

	/* Clear trap on access to p[0] */
	protect_low(PROT_READ | PROT_WRITE | PROT_EXEC);

	write(sysrqfd, "x", 1);

	/* Check the contents of p[0] */
	if (p[0] != 0xf001f001) {
		write(sysrqfd, "x", 1);

		/* Reached, but shouldn't be */
		printf("badness, shouldn't happen but does\n");
		abort();
	}
}

int main(void)
{
	struct sigaction sa;

	sysrqfd = open("/proc/sysrq-trigger", O_WRONLY);

	if (sigprocmask(SIG_BLOCK, NULL, &sa.sa_mask)) {
		perror("sigprocmask");
		return 0;
	}

	sa.sa_sigaction = sigbus_handler;
	sa.sa_flags = SA_SIGINFO | SA_NODEFER | SA_RESTART;
	if (sigaction(SIGBUS, &sa, NULL)) {
		perror("sigaction");
		return 0;
	}

	bindstack = mmap(NULL,
			 BINDSTACK_SIZE,
			 PROT_READ | PROT_WRITE | PROT_EXEC,
			 MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
	if (bindstack == MAP_FAILED) {
		perror("mmap bindstack");
		return 0;
	}

	printf("bindstack: %p\n", bindstack);

	run_bind_test();

	printf("done\n");

	return 0;
}

There are multiple ingredients for this:

 1) PAGE_NONE is defined to _CACHE_CACHABLE_NONCOHERENT, which is CCA 3
    on all platforms except SB1 where it's CCA 5.
 2) _page_cachable_default must have bits set which are not set
    _CACHE_CACHABLE_NONCOHERENT.
 3) Either the defective version of pte_modify for XPA or the standard
    version must be in used.  However pte_modify for the 36 bit address
    space support is no affected.

In that case additional bits in the final CCA mode may generate an invalid
value for the CCA field.  On the R10000 system where this was tracked
down for example a CCA 7 has been observed, which is Uncached Accelerated.

Fixed by:

 1) Using the proper CCA mode for PAGE_NONE just like for all the other
    PAGE_* pte/pmd bits.
 2) Fix the two affected variants of pte_modify.

Further code inspection also shows the same issue to exist in pmd_modify
which would affect huge page systems.

Issue in pte_modify tracked down by Alastair Bridgewater, PAGE_NONE
and pmd_modify issue found by me.

The history of this goes back beyond Linus' git history.  Chris Dearman's
commit 35133692

 ("[MIPS] Allow setting of
the cache attribute at run time.") missed the opportunity to fix this
but it was originally introduced in lmo commit
d523832cf12007b3242e50bb77d0c9e63e0b6518 ("Missing from last commit.")
and 32cc38229ac7538f2346918a09e75413e8861f87 ("New configuration option
CONFIG_MIPS_UNCACHED.")

Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
Reported-by: default avatarAlastair Bridgewater <alastair.bridgewater@gmail.com>
      6d037de9
    • Linus Torvalds's avatar
      Merge tag 'acpi-4.7-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm · dbdc3bb7
      Linus Torvalds authored 
      Pull ACPI fix from Rafael Wysocki:
 "Fix an expression in the ACPI PCI IRQ management code added by a
  recent commit that overlooked missing parens in it, so the result of
  the computation is incorrect in some cases (Sinan Kaya)"

* tag 'acpi-4.7-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  ACPI,PCI,IRQ: correct operator precedence
      dbdc3bb7
    • Linus Torvalds's avatar
      Merge tag 'pm-4.7-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm · 81dbd6f5
      Linus Torvalds authored 
      Pull power management fixes from Rafael Wysocki:
 "Three cpufreq fixes, one in the core (stable-candidate) and two in
  drivers (intel_pstate and cpufreq-dt).

  Specifics:

   - Fix a recent intel_pstate regression that caused the number of
     wakeups to increase significantly on an idle system in some cases
     due to excessive synchronize_sched() invocations (Rafael Wysocki).

   - Fix unnecessary invocations of WARN_ON() in the cpufreq core after
     cpufreq has been suspended introduced during the 4.6 cycla (Rafael
     Wysocki).

   - Fix an error code path in the cpufreq-dt-platdev driver that
     forgets to drop a reference to a DT node (Masahiro Yamada)"

* tag 'pm-4.7-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  cpufreq: Avoid false-positive WARN_ON()s in cpufreq_update_policy()
  cpufreq: dt: call of_node_put() before error out
  intel_pstate: Do not clear utilization update hooks on policy changes
      81dbd6f5
    • Linus Torvalds's avatar
      Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs · 48c4565e
      Linus Torvalds authored 
      Pull vfs fixes from Al Viro:
 "Tmpfs readdir throughput regression fix (this cycle) + some -stable
  fodder all over the place.

  One missing bit is Miklos' tonight locks.c fix - NFS folks had already
  grabbed that one by the time I woke up ;-)"

[ The locks.c fix came through the nfsd tree just moments ago ]

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
  namespace: update event counter when umounting a deleted dentry
  9p: use file_dentry()
  ceph: fix d_obtain_alias() misuses
  lockless next_positive()
  libfs.c: new helper - next_positive()
  dcache_{readdir,dir_lseek}(): don't bother with nested ->d_lock
      48c4565e
    • Linus Torvalds's avatar
      Merge tag 'nfsd-4.7-3' of git://linux-nfs.org/~bfields/linux · 2728c57f
      Linus Torvalds authored 
      Pull lockd/locks fixes from Bruce Fields:
 "One fix for lockd soft lookups in an error path, and one fix for file
  leases on overlayfs"

* tag 'nfsd-4.7-3' of git://linux-nfs.org/~bfields/linux:
  locks: use file_inode()
  lockd: unregister notifier blocks if the service fails to come up completely
      2728c57f