diff options
Diffstat (limited to 'include/hw/ppc/xive.h')
| -rw-r--r-- | include/hw/ppc/xive.h | 26 |
1 files changed, 25 insertions, 1 deletions
diff --git a/include/hw/ppc/xive.h b/include/hw/ppc/xive.h index 0d6b11e818..a3c2f50ece 100644 --- a/include/hw/ppc/xive.h +++ b/include/hw/ppc/xive.h @@ -539,7 +539,7 @@ static inline uint8_t xive_ipb_to_pipr(uint8_t ibp) } /* - * XIVE Thread Interrupt Management Aera (TIMA) + * XIVE Thread Interrupt Management Area (TIMA) * * This region gives access to the registers of the thread interrupt * management context. It is four page wide, each page providing a @@ -551,6 +551,30 @@ static inline uint8_t xive_ipb_to_pipr(uint8_t ibp) #define XIVE_TM_OS_PAGE 0x2 #define XIVE_TM_USER_PAGE 0x3 +/* + * The TCTX (TIMA) has 4 rings (phys, pool, os, user), but only signals + * (raises an interrupt on) the CPU from 3 of them. Phys and pool both + * cause a hypervisor privileged interrupt so interrupts presented on + * those rings signal using the phys ring. This helper returns the signal + * regs from the given ring. + */ +static inline uint8_t *xive_tctx_signal_regs(XiveTCTX *tctx, uint8_t ring) +{ + /* + * This is a good point to add invariants to ensure nothing has tried to + * signal using the POOL ring. + */ + g_assert(tctx->regs[TM_QW2_HV_POOL + TM_NSR] == 0); + g_assert(tctx->regs[TM_QW2_HV_POOL + TM_PIPR] == 0); + g_assert(tctx->regs[TM_QW2_HV_POOL + TM_CPPR] == 0); + + if (ring == TM_QW2_HV_POOL) { + /* POOL and PHYS rings share the signal regs (PIPR, NSR, CPPR) */ + ring = TM_QW3_HV_PHYS; + } + return &tctx->regs[ring]; +} + void xive_tctx_tm_write(XivePresenter *xptr, XiveTCTX *tctx, hwaddr offset, uint64_t value, unsigned size); uint64_t xive_tctx_tm_read(XivePresenter *xptr, XiveTCTX *tctx, hwaddr offset, |