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Re: [Qemu-ppc] [PATCH v2 01/14] spapr: populate DRC entries for root dt


From: Alexey Kardashevskiy
Subject: Re: [Qemu-ppc] [PATCH v2 01/14] spapr: populate DRC entries for root dt node
Date: Mon, 16 Dec 2013 13:59:10 +1100
User-agent: Mozilla/5.0 (X11; Linux i686 on x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.2.0

On 12/06/2013 09:32 AM, Michael Roth wrote:
> From: Nathan Fontenot <address@hidden>
> 
> This add entries to the root OF node to advertise our PHBs as being
> DR-capable in according with PAPR specification.
> 
> Each PHB is given a name of PHB<bus#>, advertised as a PHB type,
> and associated with a power domain of -1 (indicating to guests that
> power management is handled automatically by hardware).
> 
> We currently allocate entries for up to 32 DR-capable PHBs, though
> this limit can be increased later.
> 
> DrcEntry objects to track the state of the DR-connector associated
> with each PHB are stored in a 32-entry array, and each DrcEntry has
> in turn have a dynamically-sized number of child DR-connectors,
> which we will use later to track the state of DR-connectors
> associated with a PHB's physical slots.
> 
> Signed-off-by: Nathan Fontenot <address@hidden>
> Signed-off-by: Michael Roth <address@hidden>
> ---
>  hw/ppc/spapr.c         |  132 
> ++++++++++++++++++++++++++++++++++++++++++++++++
>  include/hw/ppc/spapr.h |   33 ++++++++++++
>  2 files changed, 165 insertions(+)
> 
> diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
> index 7e53a5f..ec3ba43 100644
> --- a/hw/ppc/spapr.c
> +++ b/hw/ppc/spapr.c
> @@ -81,6 +81,7 @@
>  #define HTAB_SIZE(spapr)        (1ULL << ((spapr)->htab_shift))
>  
>  sPAPREnvironment *spapr;
> +DrcEntry drc_table[SPAPR_DRC_TABLE_SIZE];
>  
>  int spapr_allocate_irq(int hint, bool lsi)
>  {
> @@ -276,6 +277,130 @@ static size_t create_page_sizes_prop(CPUPPCState *env, 
> uint32_t *prop,
>      return (p - prop) * sizeof(uint32_t);
>  }
>  
> +static void spapr_init_drc_table(void)
> +{
> +    int i;
> +
> +    memset(drc_table, 0, sizeof(drc_table));
> +
> +    /* For now we only care about PHB entries */
> +    for (i = 0; i < SPAPR_DRC_TABLE_SIZE; i++) {
> +        drc_table[i].drc_index = 0x2000001 + i;
> +    }
> +}
> +
> +DrcEntry *spapr_add_phb_to_drc_table(uint64_t buid, uint32_t state)
> +{
> +    DrcEntry *empty_drc = NULL;
> +    DrcEntry *found_drc = NULL;
> +    int i, phb_index;
> +
> +    for (i = 0; i < SPAPR_DRC_TABLE_SIZE; i++) {
> +        if (drc_table[i].phb_buid == 0) {
> +            empty_drc = &drc_table[i];
> +        }
> +
> +        if (drc_table[i].phb_buid == buid) {
> +            found_drc = &drc_table[i];
> +            break;
> +        }
> +    }
> +
> +    if (found_drc) {
> +        return found_drc;
> +    }
> +
> +    if (empty_drc) {
> +        empty_drc->phb_buid = buid;
> +        empty_drc->state = state;
> +        empty_drc->cc_state.fdt = NULL;
> +        empty_drc->cc_state.offset = 0;
> +        empty_drc->cc_state.depth = 0;
> +        empty_drc->cc_state.state = CC_STATE_IDLE;
> +        empty_drc->child_entries =
> +            g_malloc0(sizeof(DrcEntry) * SPAPR_DRC_PHB_SLOT_MAX);
> +        phb_index = buid - SPAPR_PCI_BASE_BUID;
> +        for (i = 0; i < SPAPR_DRC_PHB_SLOT_MAX; i++) {
> +            empty_drc->child_entries[i].drc_index =
> +                SPAPR_DRC_DEV_ID_BASE + (phb_index << 8) + (i << 3);
> +        }
> +        return empty_drc;
> +    }
> +
> +    return NULL;
> +}
> +
> +static void spapr_create_drc_dt_entries(void *fdt)
> +{
> +    char char_buf[1024];
> +    uint32_t int_buf[SPAPR_DRC_TABLE_SIZE + 1];
> +    uint32_t *entries;
> +    int offset, fdt_offset;
> +    int i, ret;
> +
> +    fdt_offset = fdt_path_offset(fdt, "/");
> +
> +    /* ibm,drc-indexes */
> +    memset(int_buf, 0, sizeof(int_buf));
> +    int_buf[0] = SPAPR_DRC_TABLE_SIZE;
> +
> +    for (i = 1; i <= SPAPR_DRC_TABLE_SIZE; i++) {
> +        int_buf[i] = drc_table[i-1].drc_index;
> +    }
> +
> +    ret = fdt_setprop(fdt, fdt_offset, "ibm,drc-indexes", int_buf,
> +                      sizeof(int_buf));
> +    if (ret) {
> +        fprintf(stderr, "Couldn't finalize ibm,drc-indexes property\n");
> +    }
> +
> +    /* ibm,drc-power-domains */
> +    memset(int_buf, 0, sizeof(int_buf));
> +    int_buf[0] = SPAPR_DRC_TABLE_SIZE;
> +
> +    for (i = 1; i <= SPAPR_DRC_TABLE_SIZE; i++) {
> +        int_buf[i] = 0xffffffff;
> +    }
> +
> +    ret = fdt_setprop(fdt, fdt_offset, "ibm,drc-power-domains", int_buf,
> +                      sizeof(int_buf));
> +    if (ret) {
> +        fprintf(stderr, "Couldn't finalize ibm,drc-power-domains 
> property\n");
> +    }
> +
> +    /* ibm,drc-names */
> +    memset(char_buf, 0, sizeof(char_buf));
> +    entries = (uint32_t *)&char_buf[0];
> +    *entries = SPAPR_DRC_TABLE_SIZE;
> +    offset = sizeof(*entries);
> +
> +    for (i = 0; i < SPAPR_DRC_TABLE_SIZE; i++) {
> +        offset += sprintf(char_buf + offset, "PHB %d", i + 1);
> +        char_buf[offset++] = '\0';
> +    }
> +
> +    ret = fdt_setprop(fdt, fdt_offset, "ibm,drc-names", char_buf, offset);
> +    if (ret) {
> +        fprintf(stderr, "Couldn't finalize ibm,drc-names property\n");
> +    }
> +
> +    /* ibm,drc-types */
> +    memset(char_buf, 0, sizeof(char_buf));
> +    entries = (uint32_t *)&char_buf[0];
> +    *entries = SPAPR_DRC_TABLE_SIZE;
> +    offset = sizeof(*entries);
> +
> +    for (i = 0; i < SPAPR_DRC_TABLE_SIZE; i++) {
> +        offset += sprintf(char_buf + offset, "PHB");
> +        char_buf[offset++] = '\0';
> +    }
> +
> +    ret = fdt_setprop(fdt, fdt_offset, "ibm,drc-types", char_buf, offset);
> +    if (ret) {
> +        fprintf(stderr, "Couldn't finalize ibm,drc-types property\n");
> +    }
> +}
> +
>  #define _FDT(exp) \
>      do { \
>          int ret = (exp);                                           \
> @@ -307,6 +432,8 @@ static void *spapr_create_fdt_skel(hwaddr initrd_base,
>      int i, smt = kvmppc_smt_threads();
>      unsigned char vec5[] = {0x0, 0x0, 0x0, 0x0, 0x0, 0x80};
>  
> +    spapr_init_drc_table();
> +
>      fdt = g_malloc0(FDT_MAX_SIZE);
>      _FDT((fdt_create(fdt, FDT_MAX_SIZE)));
>  
> @@ -590,6 +717,7 @@ static void spapr_finalize_fdt(sPAPREnvironment *spapr,
>      int ret;
>      void *fdt;
>      sPAPRPHBState *phb;
> +    DrcEntry *drc_entry;
>  
>      fdt = g_malloc(FDT_MAX_SIZE);
>  
> @@ -609,6 +737,8 @@ static void spapr_finalize_fdt(sPAPREnvironment *spapr,
>      }
>  
>      QLIST_FOREACH(phb, &spapr->phbs, list) {
> +        drc_entry = spapr_add_phb_to_drc_table(phb->buid, 2 /* Unusable */);
> +        g_assert(drc_entry);
>          ret = spapr_populate_pci_dt(phb, PHANDLE_XICP, fdt);
>      }
>  
> @@ -633,6 +763,8 @@ static void spapr_finalize_fdt(sPAPREnvironment *spapr,
>          spapr_populate_chosen_stdout(fdt, spapr->vio_bus);
>      }
>  
> +    spapr_create_drc_dt_entries(fdt);
> +
>      _FDT((fdt_pack(fdt)));
>  
>      if (fdt_totalsize(fdt) > FDT_MAX_SIZE) {
> diff --git a/include/hw/ppc/spapr.h b/include/hw/ppc/spapr.h
> index b2f11e9..0f2e705 100644
> --- a/include/hw/ppc/spapr.h
> +++ b/include/hw/ppc/spapr.h
> @@ -299,6 +299,39 @@ typedef struct sPAPREnvironment {
>  #define KVMPPC_H_LOGICAL_MEMOP  (KVMPPC_HCALL_BASE + 0x1)
>  #define KVMPPC_HCALL_MAX        KVMPPC_H_LOGICAL_MEMOP
>  
> +/* For dlparable/hotpluggable slots */
> +#define SPAPR_DRC_TABLE_SIZE    32
> +#define SPAPR_DRC_PHB_SLOT_MAX  32
> +#define SPAPR_DRC_DEV_ID_BASE   0x40000000
> +
> +typedef struct ConfigureConnectorState {
> +    void *fdt;
> +    int offset_start;
> +    int offset;
> +    int depth;
> +    PCIDevice *dev;
> +    enum {
> +        CC_STATE_IDLE = 0,
> +        CC_STATE_PENDING = 1,
> +        CC_STATE_ACTIVE,
> +    } state;
> +} ConfigureConnectorState;
> +
> +typedef struct DrcEntry DrcEntry;
> +
> +struct DrcEntry {
> +    uint32_t drc_index;
> +    uint64_t phb_buid;
> +    void *fdt;
> +    int fdt_offset;
> +    uint32_t state;
> +    ConfigureConnectorState cc_state;
> +    DrcEntry *child_entries;
> +};
> +
> +extern DrcEntry drc_table[SPAPR_DRC_TABLE_SIZE];
> +DrcEntry *spapr_add_phb_to_drc_table(uint64_t buid, uint32_t state);
> +
>  extern sPAPREnvironment *spapr;

So far we were trying to keep everything sPAPR-related in sPAPREnvironment.
Is @drc_table really that special?


>  
>  /*#define DEBUG_SPAPR_HCALLS*/
> 


-- 
Alexey



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