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ppc/xive: Introduce OS CAM line helpers 

The OS CAM line has a special encoding exploited by the HW. Provide
helper routines to hide the details to the TIMA command handlers. This
also clarifies the endianness of different variables : 'qw1w2' is
big-endian and 'cam' is native.

Signed-off-by: Cédric Le Goater <clg@kaod.org>
Message-Id: <20191115162436.30548-7-clg@kaod.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Cédric Le Goater 2019-11-15 17:24:19 +01:00 committed by David Gibson
parent cd55b1272e
commit 7065d0670a
1 changed files with 38 additions and 3 deletions
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41
hw/intc/xive.c
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@ -337,14 +337,49 @@ static void xive_tm_set_os_pending(XiveTCTX *tctx, hwaddr offset,
xive_tctx_notify(tctx, TM_QW1_OS);
}
static void xive_os_cam_decode(uint32_t cam, uint8_t *nvt_blk,
uint32_t *nvt_idx, bool *vo)
{
if (nvt_blk) {
*nvt_blk = xive_nvt_blk(cam);
}
if (nvt_idx) {
*nvt_idx = xive_nvt_idx(cam);
}
if (vo) {
*vo = !!(cam & TM_QW1W2_VO);
}
}
static uint32_t xive_tctx_get_os_cam(XiveTCTX *tctx, uint8_t *nvt_blk,
uint32_t *nvt_idx, bool *vo)
{
uint32_t qw1w2 = xive_tctx_word2(&tctx->regs[TM_QW1_OS]);
uint32_t cam = be32_to_cpu(qw1w2);
xive_os_cam_decode(cam, nvt_blk, nvt_idx, vo);
return qw1w2;
}
static void xive_tctx_set_os_cam(XiveTCTX *tctx, uint32_t qw1w2)
{
memcpy(&tctx->regs[TM_QW1_OS + TM_WORD2], &qw1w2, 4);
}
static uint64_t xive_tm_pull_os_ctx(XiveTCTX *tctx, hwaddr offset,
unsigned size)
{
uint32_t qw1w2_prev = xive_tctx_word2(&tctx->regs[TM_QW1_OS]);
uint32_t qw1w2;
uint32_t qw1w2_new;
uint8_t nvt_blk;
uint32_t nvt_idx;
bool vo;
qw1w2 = xive_set_field32(TM_QW1W2_VO, qw1w2_prev, 0);
memcpy(&tctx->regs[TM_QW1_OS + TM_WORD2], &qw1w2, 4);
qw1w2 = xive_tctx_get_os_cam(tctx, &nvt_blk, &nvt_idx, &vo);
/* Invalidate CAM line */
qw1w2_new = xive_set_field32(TM_QW1W2_VO, qw1w2, 0);
xive_tctx_set_os_cam(tctx, qw1w2_new);
return qw1w2;
}