BMC/Intel-BMC/linux.git/arch/mips/Kconfig, branch dev-4.4

MIPS: Fix build error when SMP is used without GIC

2016-03-16T15:43:01+00:00

commit 7a50e4688dabb8005df39b2b992d76629b8af8aa upstream. The MIPS_GIC_IPI should only be selected when MIPS_GIC is also selected, otherwise it results in a compile error. smp-gic.c uses some functions from include/linux/irqchip/mips-gic.h like plat_ipi_call_int_xlate() which are only added to the header file when MIPS_GIC is set. The Lantiq SoC does not use the GIC, but supports SMP. The calls top the functions from smp-gic.c are already protected by some #ifdefs The first part of this was introduced in commit 72e20142b2bf ("MIPS: Move GIC IPI functions out of smp-cmp.c") Signed-off-by: Hauke Mehrtens Cc: Paul Burton Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/12774/ Signed-off-by: Ralf Baechle Signed-off-by: Greg Kroah-Hartman

MIPS: vmlinux: create a section for appended DTB

2015-11-12T10:35:48+00:00

For bootloaders that support booting only ELF kernels and load only ELF segments to memory there is no easy way to supply DTB without kernel recompilation. For that purpose, create a section called .appended_dtb that can be later updated with board-specific DTB using binutils e.g. at kernel installation time. Signed-off-by: Aaro Koskinen Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/11114/ Signed-off-by: Ralf Baechle

MIPS: xilfpga: Add mipsfpga platform code

2015-11-11T07:38:44+00:00

The xilfpga platform will be DT only. Add required platform code. DT files have already been added separately. Signed-off-by: Zubair Lutfullah Kakakhel Cc: robh+dt@kernel.org Cc: linux-mips@linux-mips.org Cc: linux-kernel@vger.kernel.org Cc: devicetree@vger.kernel.org Patchwork: https://patchwork.linux-mips.org/patch/11364/ Signed-off-by: Ralf Baechle

MIPS: Make MIPS_CMDLINE_DTB default

2015-11-11T07:38:37+00:00

Seval of-enabled machines (bmips, lantiq, xlp, pistachio, ralink) copied the arguments from dtb to arcs_command_line to prevent the kernel from overwriting them. Since there is now an option to keep the dtb arguments, default to the new option remove the "backup" to arcs_command_line in case of USE_OF is enabled, except for those platforms that still take the bootloader arguments or do not use any at all. Signed-off-by: Jonas Gorski Cc: linux-mips@linux-mips.org Cc: Kevin Cernekee Cc: Florian Fainelli Cc: Zubair Lutfullah Kakakhel Cc: James Hogan Cc: John Crispin Cc: Ganesan Ramalingam Cc: Jayachandran C Cc: Andrew Bresticker Cc: James Hartley Patchwork: https://patchwork.linux-mips.org/patch/11285/ Signed-off-by: Ralf Baechle

MIPS: Make the kernel arguments from dtb available

2015-11-11T07:38:34+00:00

Similar to how arm allows using selecting between bootloader arguments, dtb arguments and both, allow to select them on mips. But since we have less control over the place of the dtb do not modify it but instead use the boot_command_line for merging them. The default is "use bootloader arguments" to keep the current behaviour as default. Signed-off-by: Jonas Gorski Cc: linux-mips@linux-mips.org Cc: Kevin Cernekee Cc: Florian Fainelli Cc: Zubair Lutfullah Kakakhel Cc: James Hogan Cc: John Crispin Cc: Ganesan Ramalingam Cc: Jayachandran C Cc: Andrew Bresticker Cc: James Hartley Patchwork: https://patchwork.linux-mips.org/patch/11284/ Signed-off-by: Ralf Baechle

MIPS: Use USE_OF as the guard for appended dtb

2015-11-11T07:38:33+00:00

Since OF is now a user selectable symbol, the choice for appended dtb support should only be visible when USE_OF is selected, as this indicates actual machine support for device tree in MIPS. Signed-off-by: Jonas Gorski Cc: linux-mips@linux-mips.org Cc: Kevin Cernekee Cc: Florian Fainelli Cc: Zubair Lutfullah Kakakhel Cc: James Hogan Cc: John Crispin Cc: Ganesan Ramalingam Cc: Jayachandran C Cc: Andrew Bresticker Cc: James Hartley Patchwork: https://patchwork.linux-mips.org/patch/11283/ Signed-off-by: Ralf Baechle

MIPS: Add LATENCYTOP support

2015-11-11T07:36:46+00:00

Add LATENCYTOP support for MIPS. Tested on OCTEON. Signed-off-by: Aaro Koskinen Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/11353/ Signed-off-by: Ralf Baechle

MIPS: VDSO: Add implementations of gettimeofday() and clock_gettime()

2015-11-11T07:36:41+00:00

Add user-mode implementations of gettimeofday() and clock_gettime() to the VDSO. This is currently usable with 2 clocksources: the CP0 count register, which is accessible to user-mode via RDHWR on R2 and later cores, or the MIPS Global Interrupt Controller (GIC) timer, which provides a "user-mode visible" section containing a mirror of its counter registers. This section must be mapped into user memory, which is done below the VDSO data page. When a supported clocksource is not in use, the VDSO functions will return -ENOSYS, which causes libc to fall back on the standard syscall path. When support for neither of these clocksources is compiled into the kernel at all, the VDSO still provides clock_gettime(), as the coarse realtime/monotonic clocks can still be implemented. However, gettimeofday() is not provided in this case as nothing can be done without a suitable clocksource. This causes the symbol lookup to fail in libc and it will then always use the standard syscall path. This patch includes a workaround for a bug in QEMU which results in RDHWR on the CP0 count register always returning a constant (incorrect) value. A fix for this has been submitted, and the workaround can be removed after the fix has been in stable releases for a reasonable amount of time. A simple performance test which calls gettimeofday() 1000 times in a loop and calculates the average execution time gives the following results on a Malta + I6400 (running at 20MHz): - Syscall: ~31000 ns - VDSO (GIC): ~15000 ns - VDSO (CP0): ~9500 ns [markos.chandras@imgtec.com: - Minor code re-arrangements in order for mappings to be made in the order they appear to the process' address space. - Move do_{monotonic, realtime} outside of the MIPS_CLOCK_VSYSCALL ifdef - Use gic_get_usm_range so we can do the GIC mapping in the arch/mips/kernel/vdso instead of the GIC irqchip driver] Signed-off-by: Alex Smith Signed-off-by: Markos Chandras Cc: linux-kernel@vger.kernel.org Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/11338/ Signed-off-by: Ralf Baechle

MIPS: Malta: Register UP SMP ops if all else fails

2015-11-11T07:35:49+00:00

If we fail to register any real SMP implementations, fall back to registering the dummy UP implementation. Otherwise when we build an SMP kernel & run it on a system where the SMP implementations fail to probe (eg. QEMU) the kernel will perform a NULL dereference attempting to call mp_ops->smp_setup() from plat_smp_setup(). Notably this fixes booting kernels with CPS SMP enabled on QEMU, which doesn't currently implement the CM, CPC or GIC. Signed-off-by: Paul Burton Cc: linux-mips@linux-mips.org Cc: Peter Hurley Cc: Rob Herring Cc: linux-kernel@vger.kernel.org Cc: Markos Chandras Patchwork: https://patchwork.linux-mips.org/patch/11223/ Signed-off-by: Ralf Baechle

MIPS: Malta: Setup RAM regions via DT

2015-11-11T07:35:47+00:00

Move memory configuration to be performed via device tree for the Malta board. This moves more Malta specific code to malta-dtshim.c, leaving the rest of the mti-malta code a little more board-agnostic. This will be useful to share more code between boards, with the device tree providing the board specifics as intended. Since we can't rely upon Malta boards running a bootloader capable of handling devictrees & filling in the required information, a piece of shim code (malta_dt_shim) is added to consume the (e)memsize variables provided as part of the bootloader environment (or on the kernel command line) then generate the DT memory node using the provided values. Signed-off-by: Paul Burton Cc: linux-mips@linux-mips.org Cc: devicetree@vger.kernel.org Cc: Kumar Gala Cc: linux-kernel@vger.kernel.org Cc: Ian Campbell Cc: Rob Herring Cc: James Hogan Cc: Pawel Moll Cc: Markos Chandras Cc: Mark Rutland Patchwork: https://patchwork.linux-mips.org/patch/11222/ Signed-off-by: Ralf Baechle