From f82fec6c1f3bf127eb46e811b0a529d83793381c Mon Sep 17 00:00:00 2001 From: Glenn Miles Date: Fri, 13 Sep 2024 11:16:53 -0500 Subject: ppc/xive2: Support "Pull Thread Context to Register" operation MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 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 Signed-off-by: Michael Kowal Reviewed-by: Cédric Le Goater Signed-off-by: Nicholas Piggin --- hw/intc/xive.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+) (limited to 'hw') diff --git a/hw/intc/xive.c b/hw/intc/xive.c index 574ac68..774e624 100644 --- a/hw/intc/xive.c +++ b/hw/intc/xive.c @@ -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, -- cgit v1.1