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

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

From: Nathan Fontenot <nfont@linux.vnet.ibm.com>

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 <nfont@linux.vnet.ibm.com>
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
---
 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;
 
 /*#define DEBUG_SPAPR_HCALLS*/
-- 
1.7.9.5