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ppc/xive2: Support "Pull Thread Context to Register" operation

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Adds support for single byte read of offset 0x838 of the TIMA address
space.  According to the XIVE2 Specification, this causes the hardware
to atomically:
  1. Read the number of bytes requested (lbz or lhz are supported).
  2. Reset the valid bit of the thread context.
  3. Return the number of bytes requested in step 1 to a register.

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 11:16:53 -05:00 • committed by Nicholas Piggin
parent cfe9a7f286
commit f82fec6c1f
2 changed files with 17 additions and 0 deletions
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15
hw/intc/xive.c
View file

@ -179,6 +179,17 @@ static uint64_t xive_tm_pull_pool_ctx(XivePresenter *xptr, XiveTCTX *tctx,
return qw2w2;
}
static uint64_t xive_tm_pull_phys_ctx(XivePresenter *xptr, XiveTCTX *tctx,
hwaddr offset, unsigned size)
{
uint8_t qw3b8_prev = tctx->regs[TM_QW3_HV_PHYS + TM_WORD2];
uint8_t qw3b8;
qw3b8 = qw3b8_prev & ~TM_QW3B8_VT;
tctx->regs[TM_QW3_HV_PHYS + TM_WORD2] = qw3b8;
return qw3b8;
}
static void xive_tm_vt_push(XivePresenter *xptr, XiveTCTX *tctx, hwaddr offset,
uint64_t value, unsigned size)
{
@ -527,6 +538,8 @@ static const XiveTmOp xive_tm_operations[] = {
xive_tm_pull_pool_ctx },
{ XIVE_TM_HV_PAGE, TM_SPC_PULL_POOL_CTX, 8, NULL,
xive_tm_pull_pool_ctx },
{ XIVE_TM_HV_PAGE, TM_SPC_PULL_PHYS_CTX, 1, NULL,
xive_tm_pull_phys_ctx },
};
static const XiveTmOp xive2_tm_operations[] = {
@ -566,6 +579,8 @@ static const XiveTmOp xive2_tm_operations[] = {
xive_tm_pull_pool_ctx },
{ XIVE_TM_HV_PAGE, TM_SPC_PULL_OS_CTX_OL, 1, xive2_tm_pull_os_ctx_ol,
NULL },
{ XIVE_TM_HV_PAGE, TM_SPC_PULL_PHYS_CTX, 1, NULL,
xive_tm_pull_phys_ctx },
};
static const XiveTmOp *xive_tm_find_op(XivePresenter *xptr, hwaddr offset,