linux.git/arch/powerpc/kernel/cpu_setup_power.S, branch v3.17

powerpc/powernv: Enable POWER8 doorbell IPIs

2014-06-11T07:05:12+00:00

This patch enables POWER8 doorbell IPIs on powernv.

Since doorbells can only IPI within a core, we test to see when we can use
doorbells and if not we fall back to XICS.  This also enables hypervisor
doorbells to wakeup us up from nap/sleep via the LPCR PECEDH bit.

Based on tests by Anton, the best case IPI latency between two threads dropped
from 894ns to 512ns.

Signed-off-by: Michael Neuling 
Signed-off-by: Benjamin Herrenschmidt

powerpc/ppc64: Do not turn AIL (reloc-on interrupts) too early

2014-04-07T00:33:15+00:00

Turn them on at the same time as we allow MSR_IR/DR in the paca
kernel MSR, ie, after the MMU has been setup enough to be able
to handle relocated access to the linear mapping.

Signed-off-by: Benjamin Herrenschmidt

powerpc/book3s: Add flush_tlb operation in cpu_spec.

2013-12-05T05:04:38+00:00

This patch introduces flush_tlb operation in cpu_spec structure. This will
help us to invoke appropriate CPU-side flush tlb routine. This patch
adds the foundation to invoke CPU specific flush routine for respective
architectures. Currently this patch introduce flush_tlb for p7 and p8.

Signed-off-by: Mahesh Salgaonkar 
Acked-by: Paul Mackerras 
Signed-off-by: Benjamin Herrenschmidt

powerpc: Fix TLB cleanup at boot on POWER8

2013-05-24T08:13:44+00:00

The TLB has 512 congruence classes (2048 entries 4 way set associative)
while P7 had 128

Signed-off-by: Benjamin Herrenschmidt

powerpc: Turn on the EBB H/FSCR bits

2013-05-02T00:36:55+00:00

This turns Event Based Branching (EBB) on in the Hypervisor Facility Status and
Control Register (HFSCR) and Facility Status and Control Register (FSCR).

Signed-off-by: Michael Neuling 
Signed-off-by: Benjamin Herrenschmidt

powerpc: Setup BHRB instructions facility in HFSCR for POWER8

2013-05-02T00:35:15+00:00

Make BHRB instructions available in problem and privileged states.

Signed-off-by: Anshuman Khandual 
Signed-off-by: Benjamin Herrenschmidt

powerpc: Initialise PMU related regs on Power8

2013-04-26T06:11:06+00:00

For both HV and guest kernels, intialise PMU regs to something sane.

Signed-off-by: Michael Ellerman 
Acked-by: Paul Mackerras 
Signed-off-by: Benjamin Herrenschmidt

powerpc/power8: Fix secondary CPUs hanging on boot for HV=0

2013-04-26T06:08:17+00:00

In __restore_cpu_power8 we determine if we are HV and if not, we return
before setting HV only resources.

Unfortunately we forgot to restore the link register from r11 before
returning.

This will happen on boot and with secondary CPUs not coming online.

This adds the missing link register restore.

Signed-off-by: Michael Neuling 
CC: 
Signed-off-by: Benjamin Herrenschmidt

powerpc: Setup in HFSCR for POWER8

2013-04-18T03:03:59+00:00

Setup the HFSCR (Hypervisor Facility Status and Control Register) for POWER8
when running HV=1.  The HFSCR is the same as the FSCR except it's for
hypervisors.  It controls the available of various facilities in OS and
userspace levels.  It also indicates the cause of a hypervisor facility
unavailable interrupt (although we are not using this here).

This patch sets the facilities Linux knows about incase the firmware doesn't.

Signed-off-by: Michael Neuling 
Signed-off-by: Michael Ellerman

powerpc: Set DSCR bit in FSCR setup

2013-03-05T05:56:30+00:00

We support DSCR (Data Stream Control Register) so we should make sure we set it
in the FSCR (Facility Status & Control Register) incase some firmwares don't
set it.  If we don't set this, we'll take a facility unavailable exception when
using the DSCR.

Signed-off-by: Michael Neuling 
Signed-off-by: Benjamin Herrenschmidt