linux.git/drivers/firmware, branch v4.3-rc2

kexec: split kexec_load syscall from kexec core code

2015-09-10T20:29:01+00:00

There are two kexec load syscalls, kexec_load another and kexec_file_load.
 kexec_file_load has been splited as kernel/kexec_file.c.  In this patch I
split kexec_load syscall code to kernel/kexec.c.

And add a new kconfig option KEXEC_CORE, so we can disable kexec_load and
use kexec_file_load only, or vice verse.

The original requirement is from Ted Ts'o, he want kexec kernel signature
being checked with CONFIG_KEXEC_VERIFY_SIG enabled.  But kexec-tools use
kexec_load syscall can bypass the checking.

Vivek Goyal proposed to create a common kconfig option so user can compile
in only one syscall for loading kexec kernel.  KEXEC/KEXEC_FILE selects
KEXEC_CORE so that old config files still work.

Because there's general code need CONFIG_KEXEC_CORE, so I updated all the
architecture Kconfig with a new option KEXEC_CORE, and let KEXEC selects
KEXEC_CORE in arch Kconfig.  Also updated general kernel code with to
kexec_load syscall.

[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: Dave Young 
Cc: Eric W. Biederman 
Cc: Vivek Goyal 
Cc: Petr Tesarik 
Cc: Theodore Ts'o 
Cc: Josh Boyer 
Cc: David Howells 
Cc: Geert Uytterhoeven 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

Merge branch 'for-linus' of git://ftp.arm.linux.org.uk/~rmk/linux-arm

2015-09-03T23:27:01+00:00

Pull ARM development updates from Russell King:
 "Included in this update:

   - moving PSCI code from ARM64/ARM to drivers/

   - removal of some architecture internals from global kernel view

   - addition of software based "privileged no access" support using the
     old domains register to turn off the ability for kernel
     loads/stores to access userspace.  Only the proper accessors will
     be usable.

   - addition of early fixup support for early console

   - re-addition (and reimplementation) of OMAP special interconnect
     barrier

   - removal of finish_arch_switch()

   - only expose cpuX/online in sysfs if hotpluggable

   - a number of code cleanups"

* 'for-linus' of git://ftp.arm.linux.org.uk/~rmk/linux-arm: (41 commits)
  ARM: software-based priviledged-no-access support
  ARM: entry: provide uaccess assembly macro hooks
  ARM: entry: get rid of multiple macro definitions
  ARM: 8421/1: smp: Collapse arch_cpu_idle_dead() into cpu_die()
  ARM: uaccess: provide uaccess_save_and_enable() and uaccess_restore()
  ARM: mm: improve do_ldrd_abort macro
  ARM: entry: ensure that IRQs are enabled when calling syscall_trace_exit()
  ARM: entry: efficiency cleanups
  ARM: entry: get rid of asm_trace_hardirqs_on_cond
  ARM: uaccess: simplify user access assembly
  ARM: domains: remove DOMAIN_TABLE
  ARM: domains: keep vectors in separate domain
  ARM: domains: get rid of manager mode for user domain
  ARM: domains: move initial domain setting value to asm/domains.h
  ARM: domains: provide domain_mask()
  ARM: domains: switch to keeping domain value in register
  ARM: 8419/1: dma-mapping: harmonize definition of DMA_ERROR_CODE
  ARM: 8417/1: refactor bitops functions with BIT_MASK() and BIT_WORD()
  ARM: 8416/1: Feroceon: use of_iomap() to map register base
  ARM: 8415/1: early fixmap support for earlycon
  ...

Merge branch 'devel-stable' into for-linus

2015-09-03T14:28:50+00:00

Conflicts:
	drivers/perf/arm_pmu.c

FIRMWARE: bcm47xx_nvram: Fix module license.

2015-08-19T13:00:08+00:00

Signed-off-by: Axel Lin 
Cc: Hauke Mehrtens 
Cc: Rafał Miłecki 
Cc: Paul Walmsley 
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/11020/
Signed-off-by: Ralf Baechle

firmware: qcom_scm-32: replace open-coded call to __cpuc_flush_dcache_area()

2015-08-11T17:45:00+00:00

Rathe rthan directly accessing architecture internal functions, provide
an "method"-centric wrapper for qcom_scm-32 to do what's necessary to
ensure that the secure monitor can see the data.  This is called
"secure_flush_area" and ensures that the specified memory area is
coherent across the secure boundary.

Acked-by: Andy Gross 
Reviewed-by: Stephen Boyd 
Signed-off-by: Russell King

drivers: psci: support native SMC{32,64} calls

2015-08-03T11:35:00+00:00

A 32-bit OS cannot make calls with SMC64 IDs, while a 64-bit OS must
invoke some PSCI functions with SMC64 IDs.

This patch introduces and makes use of a new macro to choose the
appropriate IDs based on the register width of the OS, which will allow
32-bit callers to use the PSCI client code.

Signed-off-by: Mark Rutland 
Tested-by: Hanjun Guo 
Cc: Lorenzo Pieralisi 
Signed-off-by: Will Deacon

arm64: psci: factor invocation code to drivers

2015-08-03T11:33:39+00:00

To enable sharing with arm, move the core PSCI framework code to
drivers/firmware. This results in a minor gain in lines of code, but
this will quickly be amortised by the removal of code currently
duplicated in arch/arm.

Signed-off-by: Mark Rutland 
Acked-by: Catalin Marinas 
Reviewed-by: Hanjun Guo 
Tested-by: Hanjun Guo 
Cc: Lorenzo Pieralisi 
Cc: Will Deacon 
Signed-off-by: Will Deacon

efi: Check for NULL efi kernel parameters

2015-07-30T17:07:11+00:00

Even though it is documented how to specifiy efi parameters, it is
possible to cause a kernel panic due to a dereference of a NULL pointer when
parsing such parameters if "efi" alone is given:

PANIC: early exception 0e rip 10:ffffffff812fb361 error 0 cr2 0
[ 0.000000] CPU: 0 PID: 0 Comm: swapper Not tainted 4.2.0-rc1+ #450
[ 0.000000]  ffffffff81fe20a9 ffffffff81e03d50 ffffffff8184bb0f 00000000000003f8
[ 0.000000]  0000000000000000 ffffffff81e03e08 ffffffff81f371a1 64656c62616e6520
[ 0.000000]  0000000000000069 000000000000005f 0000000000000000 0000000000000000
[ 0.000000] Call Trace:
[ 0.000000]  [] dump_stack+0x45/0x57
[ 0.000000]  [] early_idt_handler_common+0x81/0xae
[ 0.000000]  [] ? parse_option_str+0x11/0x90
[ 0.000000]  [] arch_parse_efi_cmdline+0x15/0x42
[ 0.000000]  [] do_early_param+0x50/0x8a
[ 0.000000]  [] parse_args+0x1e3/0x400
[ 0.000000]  [] parse_early_options+0x24/0x28
[ 0.000000]  [] ? loglevel+0x31/0x31
[ 0.000000]  [] parse_early_param+0x31/0x3d
[ 0.000000]  [] setup_arch+0x2de/0xc08
[ 0.000000]  [] ? vprintk_default+0x1a/0x20
[ 0.000000]  [] start_kernel+0x90/0x423
[ 0.000000]  [] x86_64_start_reservations+0x2a/0x2c
[ 0.000000]  [] x86_64_start_kernel+0xeb/0xef
[ 0.000000] RIP 0xffffffff81ba2efc

This panic is not reproducible with "efi=" as this will result in a non-NULL
zero-length string.

Thus, verify that the pointer to the parameter string is not NULL. This is
consistent with other parameter-parsing functions which check for NULL pointers.

Signed-off-by: Ricardo Neri 
Cc: Dave Young 
Cc: 
Signed-off-by: Matt Fleming

Merge tag 'efi-urgent' of git://git.kernel.org/pub/scm/linux/kernel/git/mfleming/efi into x86/urgent

2015-07-21T07:52:51+00:00

Pull an EFI fix from Matt Fleming:

 - Fix a bug in the Common Platform Error Record (CPER) driver that
   caused old UEFI spec (< 2.3) versions of the memory error record
   structure to be declared invalid. (Tony Luck)

Signed-off-by: Ingo Molnar

efi: Handle memory error structures produced based on old versions of standard

2015-07-15T12:30:38+00:00

The memory error record structure includes as its first field a
bitmask of which subsequent fields are valid. The allows new fields
to be added to the structure while keeping compatibility with older
software that parses these records. This mechanism was used between
versions 2.2 and 2.3 to add four new fields, growing the size of the
structure from 73 bytes to 80. But Linux just added all the new
fields so this test:
	if (gdata->error_data_length >= sizeof(*mem_err))
		cper_print_mem(newpfx, mem_err);
	else
		goto err_section_too_small;
now make Linux complain about old format records being too short.

Add a definition for the old format of the structure and use that
for the minimum size check. Pass the actual size to cper_print_mem()
so it can sanity check the validation_bits field to ensure that if
a BIOS using the old format sets bits as if it were new, we won't
access fields beyond the end of the structure.

Signed-off-by: Tony Luck 
Cc: 
Signed-off-by: Matt Fleming