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pnv/xive2: Support for "OS LGS Push" TIMA operation

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Adds support for single byte writes to offset 0x15 of the TIMA address
space.  This offset holds the Logical Server Group Size (LGS) field.
The field is used to evenly distribute the interrupt load among the
members of a group, but is unused in the current implementation so we
just support the writing of the value for now.

Signed-off-by: Glenn Miles <milesg@linux.vnet.ibm.com>
Signed-off-by: Michael Kowal <kowal@linux.ibm.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
This commit is contained in:
Glenn Miles 2024-09-13 11:16:49 -05:00 committed by Nicholas Piggin
parent cebfeb9e56
commit aa90c209bf
1 changed files with 15 additions and 0 deletions
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15
hw/intc/xive.c
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@ -341,6 +341,19 @@ static void xive_tm_set_os_cppr(XivePresenter *xptr, XiveTCTX *tctx,
xive_tctx_set_cppr(tctx, TM_QW1_OS, value & 0xff);
}
static void xive_tctx_set_lgs(XiveTCTX *tctx, uint8_t ring, uint8_t lgs)
{
uint8_t *regs = &tctx->regs[ring];
regs[TM_LGS] = lgs;
}
static void xive_tm_set_os_lgs(XivePresenter *xptr, XiveTCTX *tctx,
hwaddr offset, uint64_t value, unsigned size)
{
xive_tctx_set_lgs(tctx, TM_QW1_OS, value & 0xff);
}
/*
* Adjust the IPB to allow a CPU to process event queues of other
* priorities during one physical interrupt cycle.
@ -525,6 +538,8 @@ static const XiveTmOp xive2_tm_operations[] = {
NULL },
{ XIVE_TM_HV_PAGE, TM_QW1_OS + TM_WORD2, 4, xive2_tm_push_os_ctx,
NULL },
{ XIVE_TM_OS_PAGE, TM_QW1_OS + TM_LGS, 1, xive_tm_set_os_lgs,
NULL },
{ XIVE_TM_HV_PAGE, TM_QW3_HV_PHYS + TM_CPPR, 1, xive_tm_set_hv_cppr,
NULL },
{ XIVE_TM_HV_PAGE, TM_QW3_HV_PHYS + TM_WORD2, 1, xive_tm_vt_push,