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target/ppc: Work [S]PURR implementation and add HV support

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The Processor Utilisation of Resources Register (PURR) and Scaled
Processor Utilisation of Resources Register (SPURR) provide an estimate
of the resources used by the thread, present on POWER7 and later
processors.

Currently the [S]PURR registers simply count at the rate of the
timebase.

Preserve this behaviour but rework the implementation to store an offset
like the timebase rather than doing the calculation manually. Also allow
hypervisor write access to the register along with the currently
available read access.

Signed-off-by: Suraj Jitindar Singh <sjitindarsingh@gmail.com>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
[ clg: rebased on current ppc tree ]
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Message-Id: <20191128134700.16091-3-clg@kaod.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Suraj Jitindar Singh 2019-11-28 14:46:55 +01:00 • committed by David Gibson
parent 5d62725b2f
commit 5cc7e69f6d
6 changed files with 30 additions and 20 deletions
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3
include/hw/ppc/ppc.h
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@ -33,8 +33,7 @@ struct ppc_tb_t {
/* Hypervisor decrementer management */
uint64_t hdecr_next; /* Tick for next hdecr interrupt */
QEMUTimer *hdecr_timer;
uint64_t purr_load;
uint64_t purr_start;
int64_t purr_offset;
void *opaque;
uint32_t flags;
};