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Add a new device-tree property freq-domain-indicator to define group of
CPUs which would share same frequency. This property has been added under
power-mgmt node. It is a bitmask.
Bitwise AND is taken between this bitmask value and PIR of cpu. All the
CPUs lying in the same frequency domain will have same result for AND.
For example, For POWER9, 0xFFF0 indicates quad wide frequency domain.
Taking AND with the PIR of CPUs will yield us frequency domain which is
quad wise distribution as last 4 bits have been masked which represent the
cores.
Similarly, 0xFFF8 will represent core wide frequency domain for P8.
Also, Add a new device-tree property domain-runs-at which will denote the
strategy OCC is using to change the frequency of a frequency-domain. There
can be two strategy - FREQ_MOST_RECENTLY_SET and FREQ_MAX_IN_DOMAIN.
FREQ_MOST_RECENTLY_SET : the OCC sets the frequency of the quad to the most
recent frequency value requested by the CPUs in the quad.
FREQ_MAX_IN_DOMAIN : the OCC sets the frequency of the CPUs in
the Quad to the maximum of the latest frequency requested by each of
the component cores.
Signed-off-by: Abhishek Goel <huntbag@linux.vnet.ibm.com>
Signed-off-by: Stewart Smith <stewart@linux.ibm.com>
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OCC provides two limits for minimum powercap. One being hard powercap
minimum which is guaranteed by OCC and the other one is a soft
powercap minimum which is lesser than hard-min and may or may not be
asserted due to various power-thermal reasons. So to allow the users
to access the entire powercap range, this patch exports soft powercap
minimum as the "powercap-min" DT property. And it also adds a new
DT property called "powercap-hard-min" to export the hard-min powercap
limit.
Fixes: c6aabe3f2eb5("powercap: occ: Add a generic powercap framework")
Signed-off-by: Shilpasri G Bhat <shilpa.bhat@linux.vnet.ibm.com>
Reviewed-by: Vaidyanathan Srinivasan <svaidy@linux.vnet.ibm.com>
Signed-off-by: Stewart Smith <stewart@linux.ibm.com>
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Signed-off-by: Stewart Smith <stewart@linux.vnet.ibm.com>
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Add support to set the CPU-GPU power shifting ratio which is used by
the OCC power capping algorithm. PSR value of 100 takes all power away
from CPU first and a PSR value of 0 caps GPU first.
Documentation enhanced by Stewart Smith.
Signed-off-by: Shilpasri G Bhat <shilpa.bhat@linux.vnet.ibm.com>
Signed-off-by: Stewart Smith <stewart@linux.vnet.ibm.com>
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This patch adds a generic powercap framework and exports OCC powercap
sensors using which system powercap can be set inband through OPAL-OCC
command-response interface.
Documentation for powercap enhanced by Stewart Smith.
Signed-off-by: Shilpasri G Bhat <shilpa.bhat@linux.vnet.ibm.com>
Signed-off-by: Stewart Smith <stewart@linux.vnet.ibm.com>
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In P9 the pstate values are positive. They are continuous set of
unsigned integers [0 to +N] where Pmax is 0 and Pmin is N. The
linear ordering of pstates for P9 has changed compared to P8.
P8 has neagtive pstate values advertised as [0 to -N] where Pmax
is 0 and Pmin is -N. This patch adds helper routines to abstract
pstate comparison with pmax and adds sanity pstate limit checks.
This patch also fixes pstate arithmetic by using labs().
Suggested-by: Gautham R. Shenoy <ego@linux.vnet.ibm.com>
Signed-off-by: Shilpasri G Bhat <shilpa.bhat@linux.vnet.ibm.com>
Signed-off-by: Stewart Smith <stewart@linux.vnet.ibm.com>
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