[Qemu-devel] [PATCH v2 12/14] spapr_events: re-use EPOW event infrastructure for hotplug events

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

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

This extends the data structures currently used to report EPOW events to
gets via the check-exception RTAS interfaces to also include event types
for hotplug/unplug events.

This is currently undocumented and being finalized for inclusion in PAPR
specification, but we implement this here as an extension for guest
userspace tools to implement (existing guest kernels simply log these
events via a sysfs interface that's read by rtas_errd).

Signed-off-by: Nathan Fontenot <nfont@linux.vnet.ibm.com>
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
---
 hw/ppc/spapr.c         |    2 +-
 hw/ppc/spapr_events.c  |  219 +++++++++++++++++++++++++++++++++++++++---------
 include/hw/ppc/spapr.h |    4 +-
 3 files changed, 184 insertions(+), 41 deletions(-)

diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
index 2250ee1..7079e4e 100644
--- a/hw/ppc/spapr.c
+++ b/hw/ppc/spapr.c
@@ -1522,7 +1522,7 @@ static void ppc_spapr_init(QEMUMachineInitArgs *args)
     spapr->fdt_skel = spapr_create_fdt_skel(initrd_base, initrd_size,
                                             kernel_size, kernel_le,
                                             boot_device, kernel_cmdline,
-                                            spapr->epow_irq);
+                                            spapr->check_exception_irq);
     assert(spapr->fdt_skel != NULL);
 }
 
diff --git a/hw/ppc/spapr_events.c b/hw/ppc/spapr_events.c
index 16fa49e..9dfdbcf 100644
--- a/hw/ppc/spapr_events.c
+++ b/hw/ppc/spapr_events.c
@@ -32,6 +32,8 @@
 
 #include "hw/ppc/spapr.h"
 #include "hw/ppc/spapr_vio.h"
+#include "hw/pci/pci.h"
+#include "hw/pci-host/spapr.h"
 
 #include <libfdt.h>
 
@@ -77,6 +79,7 @@ struct rtas_error_log {
 #define   RTAS_LOG_TYPE_ECC_UNCORR              0x00000009
 #define   RTAS_LOG_TYPE_ECC_CORR                0x0000000a
 #define   RTAS_LOG_TYPE_EPOW                    0x00000040
+#define   RTAS_LOG_TYPE_HOTPLUG                 0x000000e5
     uint32_t extended_length;
 } QEMU_PACKED;
 
@@ -166,6 +169,38 @@ struct epow_log_full {
     struct rtas_event_log_v6_epow epow;
 } QEMU_PACKED;
 
+struct rtas_event_log_v6_hp {
+#define RTAS_LOG_V6_SECTION_ID_HOTPLUG              0x4850 /* HP */
+    struct rtas_event_log_v6_section_header hdr;
+    uint8_t hotplug_type;
+#define RTAS_LOG_V6_HP_TYPE_CPU                          1
+#define RTAS_LOG_V6_HP_TYPE_MEMORY                       2
+#define RTAS_LOG_V6_HP_TYPE_SLOT                         3
+#define RTAS_LOG_V6_HP_TYPE_PHB                          4
+#define RTAS_LOG_V6_HP_TYPE_PCI                          5
+    uint8_t hotplug_action;
+#define RTAS_LOG_V6_HP_ACTION_ADD                        1
+#define RTAS_LOG_V6_HP_ACTION_REMOVE                     2
+    uint8_t hotplug_identifier;
+#define RTAS_LOG_V6_HP_ID_DRC_NAME                       1
+#define RTAS_LOG_V6_HP_ID_DRC_INDEX                      2
+#define RTAS_LOG_V6_HP_ID_DRC_COUNT                      3
+    uint8_t reserved;
+    union {
+        uint32_t index;
+        uint32_t count;
+        char name[1];
+    } drc;
+} QEMU_PACKED;
+
+struct hp_log_full {
+    struct rtas_error_log hdr;
+    struct rtas_event_log_v6 v6hdr;
+    struct rtas_event_log_v6_maina maina;
+    struct rtas_event_log_v6_mainb mainb;
+    struct rtas_event_log_v6_hp hp;
+} QEMU_PACKED;
+
 #define EVENT_MASK_INTERNAL_ERRORS           0x80000000
 #define EVENT_MASK_EPOW                      0x40000000
 #define EVENT_MASK_HOTPLUG                   0x10000000
@@ -181,29 +216,61 @@ struct epow_log_full {
         }                                                          \
     } while (0)
 
-void spapr_events_fdt_skel(void *fdt, uint32_t epow_irq)
+void spapr_events_fdt_skel(void *fdt, uint32_t check_exception_irq)
 {
-    uint32_t epow_irq_ranges[] = {cpu_to_be32(epow_irq), cpu_to_be32(1)};
-    uint32_t epow_interrupts[] = {cpu_to_be32(epow_irq), 0};
+    uint32_t irq_ranges[] = {cpu_to_be32(check_exception_irq), cpu_to_be32(1)};
+    uint32_t interrupts[] = {cpu_to_be32(check_exception_irq), 0};
 
     _FDT((fdt_begin_node(fdt, "event-sources")));
 
     _FDT((fdt_property(fdt, "interrupt-controller", NULL, 0)));
     _FDT((fdt_property_cell(fdt, "#interrupt-cells", 2)));
     _FDT((fdt_property(fdt, "interrupt-ranges",
-                       epow_irq_ranges, sizeof(epow_irq_ranges))));
+                       irq_ranges, sizeof(irq_ranges))));
 
     _FDT((fdt_begin_node(fdt, "epow-events")));
-    _FDT((fdt_property(fdt, "interrupts",
-                       epow_interrupts, sizeof(epow_interrupts))));
+    _FDT((fdt_property(fdt, "interrupts", interrupts, sizeof(interrupts))));
     _FDT((fdt_end_node(fdt)));
 
     _FDT((fdt_end_node(fdt)));
 }
 
 static struct epow_log_full *pending_epow;
+static struct hp_log_full *pending_hp;
 static uint32_t next_plid;
 
+static void spapr_init_v6hdr(struct rtas_event_log_v6 *v6hdr)
+{
+    v6hdr->b0 = RTAS_LOG_V6_B0_VALID | RTAS_LOG_V6_B0_NEW_LOG
+        | RTAS_LOG_V6_B0_BIGENDIAN;
+    v6hdr->b2 = RTAS_LOG_V6_B2_POWERPC_FORMAT
+        | RTAS_LOG_V6_B2_LOG_FORMAT_PLATFORM_EVENT;
+    v6hdr->company = cpu_to_be32(RTAS_LOG_V6_COMPANY_IBM);
+}
+
+static void spapr_init_maina(struct rtas_event_log_v6_maina *maina,
+                             int section_count)
+{
+    struct tm tm;
+    int year;
+
+    maina->hdr.section_id = cpu_to_be16(RTAS_LOG_V6_SECTION_ID_MAINA);
+    maina->hdr.section_length = cpu_to_be16(sizeof(*maina));
+    /* FIXME: section version, subtype and creator id? */
+    qemu_get_timedate(&tm, spapr->rtc_offset);
+    year = tm.tm_year + 1900;
+    maina->creation_date = cpu_to_be32((to_bcd(year / 100) << 24)
+                                       | (to_bcd(year % 100) << 16)
+                                       | (to_bcd(tm.tm_mon + 1) << 8)
+                                       | to_bcd(tm.tm_mday));
+    maina->creation_time = cpu_to_be32((to_bcd(tm.tm_hour) << 24)
+                                       | (to_bcd(tm.tm_min) << 16)
+                                       | (to_bcd(tm.tm_sec) << 8));
+    maina->creator_id = 'H'; /* Hypervisor */
+    maina->section_count = section_count;
+    maina->plid = next_plid++;
+}
+
 static void spapr_powerdown_req(Notifier *n, void *opaque)
 {
     sPAPREnvironment *spapr = container_of(n, sPAPREnvironment, epow_notifier);
@@ -212,8 +279,6 @@ static void spapr_powerdown_req(Notifier *n, void *opaque)
     struct rtas_event_log_v6_maina *maina;
     struct rtas_event_log_v6_mainb *mainb;
     struct rtas_event_log_v6_epow *epow;
-    struct tm tm;
-    int year;
 
     if (pending_epow) {
         /* For now, we just throw away earlier events if two come
@@ -237,27 +302,8 @@ static void spapr_powerdown_req(Notifier *n, void *opaque)
     hdr->extended_length = cpu_to_be32(sizeof(*pending_epow)
                                        - sizeof(pending_epow->hdr));
 
-    v6hdr->b0 = RTAS_LOG_V6_B0_VALID | RTAS_LOG_V6_B0_NEW_LOG
-        | RTAS_LOG_V6_B0_BIGENDIAN;
-    v6hdr->b2 = RTAS_LOG_V6_B2_POWERPC_FORMAT
-        | RTAS_LOG_V6_B2_LOG_FORMAT_PLATFORM_EVENT;
-    v6hdr->company = cpu_to_be32(RTAS_LOG_V6_COMPANY_IBM);
-
-    maina->hdr.section_id = cpu_to_be16(RTAS_LOG_V6_SECTION_ID_MAINA);
-    maina->hdr.section_length = cpu_to_be16(sizeof(*maina));
-    /* FIXME: section version, subtype and creator id? */
-    qemu_get_timedate(&tm, spapr->rtc_offset);
-    year = tm.tm_year + 1900;
-    maina->creation_date = cpu_to_be32((to_bcd(year / 100) << 24)
-                                       | (to_bcd(year % 100) << 16)
-                                       | (to_bcd(tm.tm_mon + 1) << 8)
-                                       | to_bcd(tm.tm_mday));
-    maina->creation_time = cpu_to_be32((to_bcd(tm.tm_hour) << 24)
-                                       | (to_bcd(tm.tm_min) << 16)
-                                       | (to_bcd(tm.tm_sec) << 8));
-    maina->creator_id = 'H'; /* Hypervisor */
-    maina->section_count = 3; /* Main-A, Main-B and EPOW */
-    maina->plid = next_plid++;
+    spapr_init_v6hdr(v6hdr);
+    spapr_init_maina(maina, 3 /* Main-A, Main-B and EPOW */);
 
     mainb->hdr.section_id = cpu_to_be16(RTAS_LOG_V6_SECTION_ID_MAINB);
     mainb->hdr.section_length = cpu_to_be16(sizeof(*mainb));
@@ -274,9 +320,93 @@ static void spapr_powerdown_req(Notifier *n, void *opaque)
     epow->event_modifier = RTAS_LOG_V6_EPOW_MODIFIER_NORMAL;
     epow->extended_modifier = RTAS_LOG_V6_EPOW_XMODIFIER_PARTITION_SPECIFIC;
 
-    qemu_irq_pulse(xics_get_qirq(spapr->icp, spapr->epow_irq));
+    qemu_irq_pulse(xics_get_qirq(spapr->icp, spapr->check_exception_irq));
+}
+
+static void spapr_hotplug_req_event(uint8_t hp_type, uint8_t hp_action,
+                                    sPAPRPHBState *phb, int slot)
+{
+    struct rtas_error_log *hdr;
+    struct rtas_event_log_v6 *v6hdr;
+    struct rtas_event_log_v6_maina *maina;
+    struct rtas_event_log_v6_mainb *mainb;
+    struct rtas_event_log_v6_hp *hp;
+    DrcEntry *drc_entry;
+
+    if (pending_hp) {
+        /* Just toss any pending hotplug events for now, this will
+         * need to be fixed later on.
+         */
+        g_free(pending_hp);
+    }
+
+    pending_hp = g_malloc0(sizeof(*pending_hp));
+    hdr = &pending_hp->hdr;
+    v6hdr = &pending_hp->v6hdr;
+    maina = &pending_hp->maina;
+    mainb = &pending_hp->mainb;
+    hp = &pending_hp->hp;
+
+    hdr->summary = cpu_to_be32(RTAS_LOG_VERSION_6
+                               | RTAS_LOG_SEVERITY_EVENT
+                               | RTAS_LOG_DISPOSITION_NOT_RECOVERED
+                               | RTAS_LOG_OPTIONAL_PART_PRESENT
+                               | RTAS_LOG_INITIATOR_HOTPLUG
+                               | RTAS_LOG_TYPE_HOTPLUG);
+    hdr->extended_length = cpu_to_be32(sizeof(*pending_hp)
+                                       - sizeof(pending_hp->hdr));
+
+    spapr_init_v6hdr(v6hdr);
+    spapr_init_maina(maina, 3 /* Main-A, Main-B, HP */);
+
+    mainb->hdr.section_id = cpu_to_be16(RTAS_LOG_V6_SECTION_ID_MAINB);
+    mainb->hdr.section_length = cpu_to_be16(sizeof(*mainb));
+    mainb->subsystem_id = 0x80; /* External environment */
+    mainb->event_severity = 0x00; /* Informational / non-error */
+    mainb->event_subtype = 0x00; /* Normal shutdown */
+
+    hp->hdr.section_id = cpu_to_be16(RTAS_LOG_V6_SECTION_ID_HOTPLUG);
+    hp->hdr.section_length = cpu_to_be16(sizeof(*hp));
+    hp->hdr.section_version = 1; /* includes extended modifier */
+    hp->hotplug_action = hp_action;
+
+    hp->hotplug_type = hp_type;
+
+    drc_entry = spapr_phb_to_drc_entry(phb->buid);
+    if (!drc_entry) {
+        drc_entry = spapr_add_phb_to_drc_table(phb->buid, 2 /* Unusable */);
+    }
+
+    switch (hp_type) {
+    case RTAS_LOG_V6_HP_TYPE_PCI:
+        hp->drc.index = drc_entry->child_entries[slot].drc_index;
+        hp->hotplug_identifier = RTAS_LOG_V6_HP_ID_DRC_INDEX;
+        break;
+    }
+
+    qemu_irq_pulse(xics_get_qirq(spapr->icp, spapr->check_exception_irq));
+}
+
+void spapr_pci_hotplug_add_event(DeviceState *qdev, int slot)
+{
+    sPAPRPHBState *phb = SPAPR_PCI_HOST_BRIDGE(qdev);
+
+    return spapr_hotplug_req_event(RTAS_LOG_V6_HP_TYPE_PCI,
+                                   RTAS_LOG_V6_HP_ACTION_ADD, phb, slot);
 }
 
+void spapr_pci_hotplug_remove_event(DeviceState *qdev, int slot)
+{
+    sPAPRPHBState *phb = SPAPR_PCI_HOST_BRIDGE(qdev);
+
+    /* TODO: removal is generally initiated by guest, need to
+     * document what exactly the guest is supposed to do with
+     * this event. What does ACPI or shpc do?
+     */
+    return spapr_hotplug_req_event(RTAS_LOG_V6_HP_TYPE_PCI,
+                                   RTAS_LOG_V6_HP_ACTION_REMOVE, phb, slot);
+ }
+
 static void check_exception(PowerPCCPU *cpu, sPAPREnvironment *spapr,
                             uint32_t token, uint32_t nargs,
                             target_ulong args,
@@ -298,15 +428,26 @@ static void check_exception(PowerPCCPU *cpu, sPAPREnvironment *spapr,
         xinfo |= (uint64_t)rtas_ld(args, 6) << 32;
     }
 
-    if ((mask & EVENT_MASK_EPOW) && pending_epow) {
-        if (sizeof(*pending_epow) < len) {
-            len = sizeof(*pending_epow);
-        }
+    if (mask & EVENT_MASK_EPOW) {
+        if (pending_epow) {
+            if (sizeof(*pending_epow) < len) {
+                len = sizeof(*pending_epow);
+            }
 
-        cpu_physical_memory_write(buf, pending_epow, len);
-        g_free(pending_epow);
-        pending_epow = NULL;
-        rtas_st(rets, 0, RTAS_OUT_SUCCESS);
+            cpu_physical_memory_write(buf, pending_epow, len);
+            g_free(pending_epow);
+            pending_epow = NULL;
+            rtas_st(rets, 0, RTAS_OUT_SUCCESS);
+        } else if (pending_hp) {
+            if (sizeof(*pending_hp) < len) {
+                len = sizeof(*pending_hp);
+            }
+
+            cpu_physical_memory_write(buf, pending_hp, len);
+            g_free(pending_hp);
+            pending_hp = NULL;
+            rtas_st(rets, 0, RTAS_OUT_SUCCESS);
+        }
     } else {
         rtas_st(rets, 0, RTAS_OUT_NO_ERRORS_FOUND);
     }
@@ -314,7 +455,7 @@ static void check_exception(PowerPCCPU *cpu, sPAPREnvironment *spapr,
 
 void spapr_events_init(sPAPREnvironment *spapr)
 {
-    spapr->epow_irq = spapr_allocate_msi(0);
+    spapr->check_exception_irq = spapr_allocate_msi(0);
     spapr->epow_notifier.notify = spapr_powerdown_req;
     qemu_register_powerdown_notifier(&spapr->epow_notifier);
     spapr_rtas_register("check-exception", check_exception);
diff --git a/include/hw/ppc/spapr.h b/include/hw/ppc/spapr.h
index 1c9b725..9eef2ce 100644
--- a/include/hw/ppc/spapr.h
+++ b/include/hw/ppc/spapr.h
@@ -31,7 +31,7 @@ typedef struct sPAPREnvironment {
     uint64_t rtc_offset;
     bool has_graphics;
 
-    uint32_t epow_irq;
+    uint32_t check_exception_irq;
     Notifier epow_notifier;
 
     /* Migration state */
@@ -473,5 +473,7 @@ 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);
+void spapr_pci_hotplug_add_event(DeviceState *qdev, int slot);
+void spapr_pci_hotplug_remove_event(DeviceState *qdev, int slot);
 
 #endif /* !defined (__HW_SPAPR_H__) */
-- 
1.7.9.5