Re: [Qemu-devel] [PATCH v2 04/14] spapr_pci: add set-indicator RTAS interface

[Michael Roth <mdroth@linux.vnet.ibm.com>]

Quoting Alexey Kardashevskiy (2013-12-15 22:26:32)
> On 12/06/2013 09:32 AM, Michael Roth wrote:
> > From: Mike Day <ncmike@ncultra.org>
> > 
> > Signed-off-by: Mike Day <ncmike@ncultra.org>
> > Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
> > ---
> >  hw/ppc/spapr_pci.c     |   93 ++++++++++++++++++++++++++++++++++++++++++++++++
> >  include/hw/ppc/spapr.h |   28 +++++++++++++++
> >  2 files changed, 121 insertions(+)
> > 
> > diff --git a/hw/ppc/spapr_pci.c b/hw/ppc/spapr_pci.c
> > index 7568a03..1046ec8 100644
> > --- a/hw/ppc/spapr_pci.c
> > +++ b/hw/ppc/spapr_pci.c
> > @@ -35,6 +35,16 @@
> >  
> >  #include "hw/pci/pci_bus.h"
> >  
> > +/* #define DEBUG_SPAPR */
> > +
> > +#ifdef DEBUG_SPAPR
> > +#define DPRINTF(fmt, ...) \
> > +    do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0)
> > +#else
> > +#define DPRINTF(fmt, ...) \
> > +    do { } while (0)
> > +#endif
> > +
> >  /* Copied from the kernel arch/powerpc/platforms/pseries/msi.c */
> >  #define RTAS_QUERY_FN           0
> >  #define RTAS_CHANGE_FN          1
> > @@ -404,6 +414,80 @@ static void rtas_ibm_query_interrupt_source_number(PowerPCCPU *cpu,
> >      rtas_st(rets, 2, 1);/* 0 == level; 1 == edge */
> >  }
> >  
> > +static void rtas_set_indicator(PowerPCCPU *cpu, sPAPREnvironment *spapr,
> > +                               uint32_t token, uint32_t nargs,
> > +                               target_ulong args, uint32_t nret,
> > +                               target_ulong rets)
> > +{
> > +    uint32_t indicator = rtas_ld(args, 0);
> > +    uint32_t drc_index = rtas_ld(args, 1);
> > +    uint32_t indicator_state = rtas_ld(args, 2);
> > +    uint32_t encoded = 0, shift = 0, mask = 0;
> > +    uint32_t *pind;
> > +    DrcEntry *drc_entry = NULL;
> > +
> > +    if (drc_index == 0) { /* platform indicator */
> > +        pind = &spapr->state;
> > +    } else {
> > +        drc_entry = spapr_find_drc_entry(drc_index);
> > +        if (!drc_entry) {
> > +            DPRINTF("rtas_set_indicator: unable to find drc_entry for %x",
> > +                    drc_index);
> > +            rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
> > +            return;
> > +        }
> > +        pind = &drc_entry->state;
> > +    }
> > +
> > +    switch (indicator) {
> > +    case 9:  /* EPOW */
> > +        shift = INDICATOR_EPOW_SHIFT;
> > +        mask = INDICATOR_EPOW_MASK;
> > +        break;
> > +    case 9001: /* Isolation state */
> > +        /* encode the new value into the correct bit field */
> > +        shift = INDICATOR_ISOLATION_SHIFT;
> > +        mask = INDICATOR_ISOLATION_MASK;
> > +        break;
> > +    case 9002: /* DR */
> > +        shift = INDICATOR_DR_SHIFT;
> > +        mask = INDICATOR_DR_MASK;
> > +        break;
> > +    case 9003: /* Allocation State */
> > +        shift = INDICATOR_ALLOCATION_SHIFT;
> > +        mask = INDICATOR_ALLOCATION_MASK;
> > +        break;
> > +    case 9005: /* global interrupt */
> > +        shift = INDICATOR_GLOBAL_INTERRUPT_SHIFT;
> > +        mask = INDICATOR_GLOBAL_INTERRUPT_MASK;
> > +        break;
> > +    case 9006: /* error log */
> > +        shift = INDICATOR_ERROR_LOG_SHIFT;
> > +        mask = INDICATOR_ERROR_LOG_MASK;
> > +        break;
> > +    case 9007: /* identify */
> > +        shift = INDICATOR_IDENTIFY_SHIFT;
> > +        mask = INDICATOR_IDENTIFY_MASK;
> > +        break;
> > +    case 9009: /* reset */
> > +        shift = INDICATOR_RESET_SHIFT;
> > +        mask = INDICATOR_RESET_MASK;
> > +        break;
> > +    default:
> > +        DPRINTF("rtas_set_indicator: indicator not implemented: %d",
> > +                indicator);
> > +        rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
> > +        return;
> > +    }
> > +
> > +    encoded = ENCODE_DRC_STATE(indicator_state, mask, shift);
> > +    /* clear the current indicator value */
> > +    *pind &= ~mask;
> > +    /* set the new value */
> > +    *pind |= encoded;
> > +    rtas_st(rets, 0, RTAS_OUT_SUCCESS);
> > +}
> > +
> >  static int pci_spapr_swizzle(int slot, int pin)
> >  {
> >      return (slot + pin) % PCI_NUM_PINS;
> > @@ -637,6 +721,14 @@ static int spapr_phb_init(SysBusDevice *s)
> >          sphb->lsi_table[i].irq = irq;
> >      }
> >  
> > +    /* make sure the platform EPOW sensor is initialized - the
> > +     * guest will probe it when there is a hotplug event.
> > +     */
> > +    spapr->state &= ~(uint32_t)INDICATOR_EPOW_MASK;
> > +    spapr->state |= ENCODE_DRC_STATE(0,
> > +                                     INDICATOR_EPOW_MASK,
> > +                                     INDICATOR_EPOW_SHIFT);
> > +
> >      return 0;
> >  }
> >  
> > @@ -958,6 +1050,7 @@ void spapr_pci_rtas_init(void)
> >                              rtas_ibm_query_interrupt_source_number);
> >          spapr_rtas_register("ibm,change-msi", rtas_ibm_change_msi);
> >      }
> > +    spapr_rtas_register("set-indicator", rtas_set_indicator);
> >  }
> >  
> >  static void spapr_pci_register_types(void)
> > diff --git a/include/hw/ppc/spapr.h b/include/hw/ppc/spapr.h
> > index 6ae5c54..b48c55f 100644
> > --- a/include/hw/ppc/spapr.h
> > +++ b/include/hw/ppc/spapr.h
> > @@ -38,6 +38,9 @@ typedef struct sPAPREnvironment {
> >      int htab_save_index;
> >      bool htab_first_pass;
> >      int htab_fd;
> > +
> > +    /* platform state - sensors and indicators */
> > +    uint32_t state;
> >  } sPAPREnvironment;
> >  
> >  #define H_SUCCESS         0
> > @@ -334,6 +337,31 @@ DrcEntry *spapr_add_phb_to_drc_table(uint64_t buid, uint32_t state);
> >  DrcEntry *spapr_phb_to_drc_entry(uint64_t buid);
> >  DrcEntry *spapr_find_drc_entry(int drc_index);
> >  
> > +/* For set-indicator RTAS interface */
> > +#define INDICATOR_ISOLATION_MASK            0x0001   /* 9001 one bit */
> > +#define INDICATOR_GLOBAL_INTERRUPT_MASK     0x0002   /* 9005 one bit */
> > +#define INDICATOR_ERROR_LOG_MASK            0x0004   /* 9006 one bit */
> > +#define INDICATOR_IDENTIFY_MASK             0x0008   /* 9007 one bit */
> > +#define INDICATOR_RESET_MASK                0x0010   /* 9009 one bit */
> > +#define INDICATOR_DR_MASK                   0x00e0   /* 9002 three bits */
> > +#define INDICATOR_ALLOCATION_MASK           0x0300   /* 9003 two bits */
> > +#define INDICATOR_EPOW_MASK                 0x1c00   /* 9 three bits */
> > +
> > +#define INDICATOR_ISOLATION_SHIFT           0x00     /* bit 0 */
> > +#define INDICATOR_GLOBAL_INTERRUPT_SHIFT    0x01     /* bit 1 */
> > +#define INDICATOR_ERROR_LOG_SHIFT           0x02     /* bit 2 */
> > +#define INDICATOR_IDENTIFY_SHIFT            0x03     /* bit 3 */
> > +#define INDICATOR_RESET_SHIFT               0x04     /* bit 4 */
> > +#define INDICATOR_DR_SHIFT                  0x05     /* bits 5-7 */
> > +#define INDICATOR_ALLOCATION_SHIFT          0x08     /* bits 8-9 */
> > +#define INDICATOR_EPOW_SHIFT                0x0a     /* bits 10-12 */
> > +
> > +#define DECODE_DRC_STATE(state, m, s)                  \
> > +    ((((uint32_t)(state) & (uint32_t)(m))) >> (s))
> > +
> > +#define ENCODE_DRC_STATE(val, m, s) \
> > +    (((uint32_t)(val) << (s)) & (uint32_t)(m))
> > +
> 
> 
> Why to put these definitions in the header when they are only used by the
> spapr_pci.c? It gives me the (wrong) idea that these are shared between
> files...

Agreed these should live in spapr_pci.c, will fix.

> 
> 
> 
> >  extern sPAPREnvironment *spapr;
> >  
> >  /*#define DEBUG_SPAPR_HCALLS*/
> > 
> 
> 
> -- 
> Alexey