Commit 7065d067 authored by Cédric Le Goater's avatar Cédric Le Goater Committed by David Gibson
Browse files

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: default avatarCédric Le Goater <clg@kaod.org>
Message-Id: <20191115162436.30548-7-clg@kaod.org>
Signed-off-by: default avatarDavid Gibson <david@gibson.dropbear.id.au>
parent cd55b127

hw/intc/xive.c

+38 −3
Original line number Diff line number Diff line
@@ -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;

}