[Qemu-devel] [PATCH 01/12] 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         | 143 +++++++++++++++++++++++++++++++++++++++++++++++++
 hw/ppc/spapr_pci.c     |   1 +
 include/hw/ppc/spapr.h |  35 ++++++++++++
 3 files changed, 179 insertions(+)

diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
index 5c92707..d5e46c3 100644
--- a/hw/ppc/spapr.c
+++ b/hw/ppc/spapr.c
@@ -296,6 +296,143 @@ static hwaddr spapr_node0_size(void)
     return ram_size;
 }
 
+sPAPRDrcEntry *spapr_phb_to_drc_entry(uint64_t buid)
+{
+    int i;
+
+    for (i = 0; i < SPAPR_DRC_TABLE_SIZE; i++) {
+        if (spapr->drc_table[i].phb_buid == buid) {
+            return &spapr->drc_table[i];
+        }
+     }
+
+     return NULL;
+}
+
+static void spapr_init_drc_table(void)
+{
+    int i;
+
+    memset(spapr->drc_table, 0, sizeof(spapr->drc_table));
+
+    /* For now we only care about PHB entries */
+    for (i = 0; i < SPAPR_DRC_TABLE_SIZE; i++) {
+        spapr->drc_table[i].drc_index = 0x2000001 + i;
+    }
+}
+
+sPAPRDrcEntry *spapr_add_phb_to_drc_table(uint64_t buid, uint32_t state)
+{
+    sPAPRDrcEntry *empty_drc = NULL;
+    sPAPRDrcEntry *found_drc = NULL;
+    int i, phb_index;
+
+    for (i = 0; i < SPAPR_DRC_TABLE_SIZE; i++) {
+        if (spapr->drc_table[i].phb_buid == 0) {
+            empty_drc = &spapr->drc_table[i];
+        }
+
+        if (spapr->drc_table[i].phb_buid == buid) {
+            found_drc = &spapr->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(sPAPRDrcEntry) * 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] = spapr->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);                                           \
@@ -731,6 +868,7 @@ static void spapr_finalize_fdt(sPAPREnvironment *spapr,
     char *bootlist;
     void *fdt;
     sPAPRPHBState *phb;
+    sPAPRDrcEntry *drc_entry;
 
     fdt = g_malloc(FDT_MAX_SIZE);
 
@@ -750,6 +888,8 @@ static void spapr_finalize_fdt(sPAPREnvironment *spapr,
     }
 
     QLIST_FOREACH(phb, &spapr->phbs, list) {
+        drc_entry = spapr_phb_to_drc_entry(phb->buid);
+        g_assert(drc_entry);
         ret = spapr_populate_pci_dt(phb, PHANDLE_XICP, fdt);
     }
 
@@ -789,6 +929,8 @@ 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) {
@@ -1443,6 +1585,7 @@ static void ppc_spapr_init(MachineState *machine)
     spapr_pci_msi_init(spapr, SPAPR_PCI_MSI_WINDOW);
     spapr_pci_rtas_init();
 
+    spapr_init_drc_table();
     phb = spapr_create_phb(spapr, 0);
 
     for (i = 0; i < nb_nics; i++) {
diff --git a/hw/ppc/spapr_pci.c b/hw/ppc/spapr_pci.c
index 9ed39a9..e85134f 100644
--- a/hw/ppc/spapr_pci.c
+++ b/hw/ppc/spapr_pci.c
@@ -531,6 +531,7 @@ static void spapr_phb_realize(DeviceState *dev, Error **errp)
             + sphb->index * SPAPR_PCI_WINDOW_SPACING;
         sphb->mem_win_addr = windows_base + SPAPR_PCI_MMIO_WIN_OFF;
         sphb->io_win_addr = windows_base + SPAPR_PCI_IO_WIN_OFF;
+        spapr_add_phb_to_drc_table(sphb->buid, 2 /* Unusable */);
     }
 
     if (sphb->buid == -1) {
diff --git a/include/hw/ppc/spapr.h b/include/hw/ppc/spapr.h
index 36e8e51..c93794b 100644
--- a/include/hw/ppc/spapr.h
+++ b/include/hw/ppc/spapr.h
@@ -10,6 +10,36 @@ struct sPAPRNVRAM;
 
 #define HPTE64_V_HPTE_DIRTY     0x0000000000000040ULL
 
+/* 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 sPAPRConfigureConnectorState {
+    void *fdt;
+    int offset_start;
+    int offset;
+    int depth;
+    PCIDevice *dev;
+    enum {
+        CC_STATE_IDLE = 0,
+        CC_STATE_PENDING = 1,
+        CC_STATE_ACTIVE,
+    } state;
+} sPAPRConfigureConnectorState;
+
+typedef struct sPAPRDrcEntry sPAPRDrcEntry;
+
+struct sPAPRDrcEntry {
+    uint32_t drc_index;
+    uint64_t phb_buid;
+    void *fdt;
+    int fdt_offset;
+    uint32_t state;
+    sPAPRConfigureConnectorState cc_state;
+    sPAPRDrcEntry *child_entries;
+};
+
 typedef struct sPAPREnvironment {
     struct VIOsPAPRBus *vio_bus;
     QLIST_HEAD(, sPAPRPHBState) phbs;
@@ -39,6 +69,9 @@ typedef struct sPAPREnvironment {
     int htab_save_index;
     bool htab_first_pass;
     int htab_fd;
+
+    /* state for Dynamic Reconfiguration Connectors */
+    sPAPRDrcEntry drc_table[SPAPR_DRC_TABLE_SIZE];
 } sPAPREnvironment;
 
 #define H_SUCCESS         0
@@ -481,5 +514,7 @@ int spapr_dma_dt(void *fdt, int node_off, const char *propname,
                  uint32_t liobn, uint64_t window, uint32_t size);
 int spapr_tcet_dma_dt(void *fdt, int node_off, const char *propname,
                       sPAPRTCETable *tcet);
+sPAPRDrcEntry *spapr_add_phb_to_drc_table(uint64_t buid, uint32_t state);
+sPAPRDrcEntry *spapr_phb_to_drc_entry(uint64_t buid);
 
 #endif /* !defined (__HW_SPAPR_H__) */
-- 
1.9.1