Re: [PATCH v2 1/9] pnv/xive2: XIVE2 Cache Watch, Cache Flush and Sync Injection support

Tue, 16 Jul 2024 08:33:47 -0700 


On 7/16/2024 2:28 AM, Cédric Le Goater wrote:

On 7/15/24 20:33, Michael Kowal wrote:

From: Frederic Barrat <fbar...@linux.ibm.com>


XIVE offers a 'cache watch facility', which allows software to 
read/update

a potentially cached table entry with no software lock. There's one such
facility in the Virtualization Controller (VC) to update the ESB and END
entries and one in the Presentation Controller (PC) to update the
NVP/NVG/NVC entries.

Each facility has 4 cache watch engines to control the updates and
firmware can request an available engine by querying the hardware
'watch_assign' register of the VC or PC. The engine is then reserved and

is released after the data is updated by reading the 'watch_spec' 
register

(which also allows to check for a conflict during the update).
If no engine is available, the special value 0xFF is returned and
firmware is expected to repeat the request until an engine becomes
available.

Signed-off-by: Frederic Barrat <fbar...@linux.ibm.com>
Signed-off-by: Michael Kowal <ko...@linux.vnet.ibm.com>
---
  hw/intc/pnv_xive2_regs.h |  90 ++++++++++++++
  hw/intc/pnv_xive2.c      | 253 +++++++++++++++++++++++++++++++++------
  2 files changed, 307 insertions(+), 36 deletions(-)

diff --git a/hw/intc/pnv_xive2_regs.h b/hw/intc/pnv_xive2_regs.h
index 7165dc8704..f8e4a677c6 100644
--- a/hw/intc/pnv_xive2_regs.h
+++ b/hw/intc/pnv_xive2_regs.h
@@ -283,6 +283,15 @@
  #define   VC_ENDC_SYNC_QUEUE_HARD               PPC_BIT(6)
  #define   VC_QUEUE_COUNT                        7
  +/* ENDC cache watch assign */
+#define X_VC_ENDC_WATCH_ASSIGN                  0x186
+#define VC_ENDC_WATCH_ASSIGN                    0x430
+
+/* ENDC configuration register */
+#define X_VC_ENDC_CFG                           0x188
+#define VC_ENDC_CFG                             0x440
+#define   VC_ENDC_CFG_CACHE_WATCH_ASSIGN        PPC_BITMASK(32, 35)
+
  /* ENDC cache watch specification 0  */
  #define X_VC_ENDC_WATCH0_SPEC                   0x1A0
  #define VC_ENDC_WATCH0_SPEC                     0x500
@@ -302,6 +311,42 @@
  #define VC_ENDC_WATCH0_DATA2                    0x530
  #define VC_ENDC_WATCH0_DATA3                    0x538
  +/* ENDC cache watch 1  */
+#define X_VC_ENDC_WATCH1_SPEC                   0x1A8
+#define VC_ENDC_WATCH1_SPEC                     0x540
+#define X_VC_ENDC_WATCH1_DATA0                  0x1AC
+#define X_VC_ENDC_WATCH1_DATA1                  0x1AD
+#define X_VC_ENDC_WATCH1_DATA2                  0x1AE
+#define X_VC_ENDC_WATCH1_DATA3                  0x1AF
+#define VC_ENDC_WATCH1_DATA0                    0x560
+#define VC_ENDC_WATCH1_DATA1                    0x568
+#define VC_ENDC_WATCH1_DATA2                    0x570
+#define VC_ENDC_WATCH1_DATA3                    0x578
+
+/* ENDC cache watch 2  */
+#define X_VC_ENDC_WATCH2_SPEC                   0x1B0
+#define VC_ENDC_WATCH2_SPEC                     0x580
+#define X_VC_ENDC_WATCH2_DATA0                  0x1B4
+#define X_VC_ENDC_WATCH2_DATA1                  0x1B5
+#define X_VC_ENDC_WATCH2_DATA2                  0x1B6
+#define X_VC_ENDC_WATCH2_DATA3                  0x1B7
+#define VC_ENDC_WATCH2_DATA0                    0x5A0
+#define VC_ENDC_WATCH2_DATA1                    0x5A8
+#define VC_ENDC_WATCH2_DATA2                    0x5B0
+#define VC_ENDC_WATCH2_DATA3                    0x5B8
+
+/* ENDC cache watch 3  */
+#define X_VC_ENDC_WATCH3_SPEC                   0x1B8
+#define VC_ENDC_WATCH3_SPEC                     0x5C0
+#define X_VC_ENDC_WATCH3_DATA0                  0x1BC
+#define X_VC_ENDC_WATCH3_DATA1                  0x1BD
+#define X_VC_ENDC_WATCH3_DATA2                  0x1BE
+#define X_VC_ENDC_WATCH3_DATA3                  0x1BF
+#define VC_ENDC_WATCH3_DATA0                    0x5E0
+#define VC_ENDC_WATCH3_DATA1                    0x5E8
+#define VC_ENDC_WATCH3_DATA2                    0x5F0
+#define VC_ENDC_WATCH3_DATA3                    0x5F8
+
  /*
   * PC LSB1
   */
@@ -358,6 +403,15 @@
  #define  PC_NXC_FLUSH_POLL_BLOCK_ID_MASK PPC_BITMASK(36, 39)

  #define  PC_NXC_FLUSH_POLL_OFFSET_MASK PPC_BITMASK(40, 63) /* 
24-bit */

  +/* NxC Cache watch assign */
+#define X_PC_NXC_WATCH_ASSIGN                   0x286
+#define PC_NXC_WATCH_ASSIGN                     0x430
+
+/* NxC Proc config */
+#define X_PC_NXC_PROC_CONFIG                    0x28A
+#define PC_NXC_PROC_CONFIG                      0x450
+#define   PC_NXC_PROC_CONFIG_WATCH_ASSIGN       PPC_BITMASK(0, 3)
+
  /* NxC Cache Watch 0 Specification */
  #define X_PC_NXC_WATCH0_SPEC                    0x2A0
  #define PC_NXC_WATCH0_SPEC                      0x500
@@ -381,6 +435,42 @@
  #define PC_NXC_WATCH0_DATA2                     0x530
  #define PC_NXC_WATCH0_DATA3                     0x538
  +/* NxC Cache Watch 1 */
+#define X_PC_NXC_WATCH1_SPEC                    0x2A8
+#define PC_NXC_WATCH1_SPEC                      0x540
+#define X_PC_NXC_WATCH1_DATA0                   0x2AC
+#define X_PC_NXC_WATCH1_DATA1                   0x2AD
+#define X_PC_NXC_WATCH1_DATA2                   0x2AE
+#define X_PC_NXC_WATCH1_DATA3                   0x2AF
+#define PC_NXC_WATCH1_DATA0                     0x560
+#define PC_NXC_WATCH1_DATA1                     0x568
+#define PC_NXC_WATCH1_DATA2                     0x570
+#define PC_NXC_WATCH1_DATA3                     0x578
+
+/* NxC Cache Watch 2 */
+#define X_PC_NXC_WATCH2_SPEC                    0x2B0
+#define PC_NXC_WATCH2_SPEC                      0x580
+#define X_PC_NXC_WATCH2_DATA0                   0x2B4
+#define X_PC_NXC_WATCH2_DATA1                   0x2B5
+#define X_PC_NXC_WATCH2_DATA2                   0x2B6
+#define X_PC_NXC_WATCH2_DATA3                   0x2B7
+#define PC_NXC_WATCH2_DATA0                     0x5A0
+#define PC_NXC_WATCH2_DATA1                     0x5A8
+#define PC_NXC_WATCH2_DATA2                     0x5B0
+#define PC_NXC_WATCH2_DATA3                     0x5B8
+
+/* NxC Cache Watch 3 */
+#define X_PC_NXC_WATCH3_SPEC                    0x2B8
+#define PC_NXC_WATCH3_SPEC                      0x5C0
+#define X_PC_NXC_WATCH3_DATA0                   0x2BC
+#define X_PC_NXC_WATCH3_DATA1                   0x2BD
+#define X_PC_NXC_WATCH3_DATA2                   0x2BE
+#define X_PC_NXC_WATCH3_DATA3                   0x2BF
+#define PC_NXC_WATCH3_DATA0                     0x5E0
+#define PC_NXC_WATCH3_DATA1                     0x5E8
+#define PC_NXC_WATCH3_DATA2                     0x5F0
+#define PC_NXC_WATCH3_DATA3                     0x5F8
+
  /*
   * TCTXT Registers
   */
diff --git a/hw/intc/pnv_xive2.c b/hw/intc/pnv_xive2.c
index 2fb4fa29d4..f6a735cca5 100644
--- a/hw/intc/pnv_xive2.c
+++ b/hw/intc/pnv_xive2.c

@@ -329,40 +329,48 @@ static int pnv_xive2_write_end(Xive2Router 
*xrtr, uint8_t blk, uint32_t idx,

                                word_number);
  }
  -static int pnv_xive2_end_update(PnvXive2 *xive)
+static int pnv_xive2_end_update(PnvXive2 *xive, uint8_t watch_engine)
  {
-    uint8_t  blk = GETFIELD(VC_ENDC_WATCH_BLOCK_ID,
- xive->vc_regs[(VC_ENDC_WATCH0_SPEC >> 3)]);
-    uint32_t idx = GETFIELD(VC_ENDC_WATCH_INDEX,
- xive->vc_regs[(VC_ENDC_WATCH0_SPEC >> 3)]);
-    int i;
+    uint8_t  blk;
+    uint32_t idx;
+    int i, spec_reg, data_reg;
      uint64_t endc_watch[4];
  +    assert(watch_engine < ARRAY_SIZE(endc_watch));
+
+    spec_reg = (VC_ENDC_WATCH0_SPEC + watch_engine * 0x40) >> 3;
+    data_reg = (VC_ENDC_WATCH0_DATA0 + watch_engine * 0x40) >> 3;
+    blk = GETFIELD(VC_ENDC_WATCH_BLOCK_ID, xive->vc_regs[spec_reg]);
+    idx = GETFIELD(VC_ENDC_WATCH_INDEX, xive->vc_regs[spec_reg]);
+
      for (i = 0; i < ARRAY_SIZE(endc_watch); i++) {
-        endc_watch[i] =

-            cpu_to_be64(xive->vc_regs[(VC_ENDC_WATCH0_DATA0 >> 3) + 
i]);

+        endc_watch[i] = cpu_to_be64(xive->vc_regs[data_reg + i]);
      }
        return pnv_xive2_vst_write(xive, VST_END, blk, idx, endc_watch,
                                XIVE_VST_WORD_ALL);
  }
  -static void pnv_xive2_end_cache_load(PnvXive2 *xive)

+static void pnv_xive2_end_cache_load(PnvXive2 *xive, uint8_t 
watch_engine)

  {
-    uint8_t  blk = GETFIELD(VC_ENDC_WATCH_BLOCK_ID,
- xive->vc_regs[(VC_ENDC_WATCH0_SPEC >> 3)]);
-    uint32_t idx = GETFIELD(VC_ENDC_WATCH_INDEX,
- xive->vc_regs[(VC_ENDC_WATCH0_SPEC >> 3)]);
+    uint8_t  blk;
+    uint32_t idx;
      uint64_t endc_watch[4] = { 0 };
-    int i;
+    int i, spec_reg, data_reg;
+
+    assert(watch_engine < ARRAY_SIZE(endc_watch));
+
+    spec_reg = (VC_ENDC_WATCH0_SPEC + watch_engine * 0x40) >> 3;
+    data_reg = (VC_ENDC_WATCH0_DATA0 + watch_engine * 0x40) >> 3;
+    blk = GETFIELD(VC_ENDC_WATCH_BLOCK_ID, xive->vc_regs[spec_reg]);
+    idx = GETFIELD(VC_ENDC_WATCH_INDEX, xive->vc_regs[spec_reg]);
        if (pnv_xive2_vst_read(xive, VST_END, blk, idx, endc_watch)) {
          xive2_error(xive, "VST: no END entry %x/%x !?", blk, idx);
      }
        for (i = 0; i < ARRAY_SIZE(endc_watch); i++) {
-        xive->vc_regs[(VC_ENDC_WATCH0_DATA0 >> 3) + i] =
-            be64_to_cpu(endc_watch[i]);
+        xive->vc_regs[data_reg + i] = be64_to_cpu(endc_watch[i]);
      }
  }

  @@ -379,40 +387,50 @@ static int pnv_xive2_write_nvp(Xive2Router 
*xrtr, uint8_t blk, uint32_t idx,

                                word_number);
  }
  -static int pnv_xive2_nvp_update(PnvXive2 *xive)
+static int pnv_xive2_nvp_update(PnvXive2 *xive, uint8_t watch_engine)
  {
-    uint8_t  blk = GETFIELD(PC_NXC_WATCH_BLOCK_ID,
- xive->pc_regs[(PC_NXC_WATCH0_SPEC >> 3)]);
-    uint32_t idx = GETFIELD(PC_NXC_WATCH_INDEX,
- xive->pc_regs[(PC_NXC_WATCH0_SPEC >> 3)]);
-    int i;
+    uint8_t  blk;
+    uint32_t idx;
+    int i, spec_reg, data_reg;
      uint64_t nxc_watch[4];
  +    if (watch_engine > 3) {
+        return -1;
+    }


Why not an assert here and below ?


Thanks,

C.


Hmmm, I added assert()s...  Not sure what happened, maybe applying a 
different patch overwrote it.  I will verify changes and add assert()s 
back in.





+    spec_reg = (PC_NXC_WATCH0_SPEC + watch_engine * 0x40) >> 3;
+    data_reg = (PC_NXC_WATCH0_DATA0 + watch_engine * 0x40) >> 3;
+    blk = GETFIELD(PC_NXC_WATCH_BLOCK_ID, xive->pc_regs[spec_reg]);
+    idx = GETFIELD(PC_NXC_WATCH_INDEX, xive->pc_regs[spec_reg]);
+
      for (i = 0; i < ARRAY_SIZE(nxc_watch); i++) {
-        nxc_watch[i] =
-            cpu_to_be64(xive->pc_regs[(PC_NXC_WATCH0_DATA0 >> 3) + i]);
+        nxc_watch[i] = cpu_to_be64(xive->pc_regs[data_reg + i]);
      }
        return pnv_xive2_vst_write(xive, VST_NVP, blk, idx, nxc_watch,
                                XIVE_VST_WORD_ALL);
  }
  -static void pnv_xive2_nvp_cache_load(PnvXive2 *xive)

+static void pnv_xive2_nvp_cache_load(PnvXive2 *xive, uint8_t 
watch_engine)

  {
-    uint8_t  blk = GETFIELD(PC_NXC_WATCH_BLOCK_ID,
-                           xive->pc_regs[(PC_NXC_WATCH0_SPEC >> 3)]);
-    uint32_t idx = GETFIELD(PC_NXC_WATCH_INDEX,
-                           xive->pc_regs[(PC_NXC_WATCH0_SPEC >> 3)]);
+    uint8_t  blk;
+    uint32_t idx;
      uint64_t nxc_watch[4] = { 0 };
-    int i;
+    int i, spec_reg, data_reg;
+
+    if (watch_engine > 3) {
+        return;
+    }
+    spec_reg = (PC_NXC_WATCH0_SPEC + watch_engine * 0x40) >> 3;
+    data_reg = (PC_NXC_WATCH0_DATA0 + watch_engine * 0x40) >> 3;
+    blk = GETFIELD(PC_NXC_WATCH_BLOCK_ID, xive->pc_regs[spec_reg]);
+    idx = GETFIELD(PC_NXC_WATCH_INDEX, xive->pc_regs[spec_reg]);
        if (pnv_xive2_vst_read(xive, VST_NVP, blk, idx, nxc_watch)) {
          xive2_error(xive, "VST: no NVP entry %x/%x !?", blk, idx);
      }
        for (i = 0; i < ARRAY_SIZE(nxc_watch); i++) {
-        xive->pc_regs[(PC_NXC_WATCH0_DATA0 >> 3) + i] =
-            be64_to_cpu(nxc_watch[i]);
+        xive->pc_regs[data_reg + i] = be64_to_cpu(nxc_watch[i]);
      }
  }

  @@ -964,12 +982,70 @@ static const MemoryRegionOps 
pnv_xive2_ic_cq_ops = {

      },
  };
  +static uint8_t pnv_xive2_cache_watch_assign(uint64_t engine_mask,
+                                            uint64_t *state)
+{
+    uint8_t val = 0xFF;
+    int i;
+
+    for (i = 3; i >= 0; i--) {
+        if (BIT(i) & engine_mask) {
+            if (!(BIT(i) & *state)) {
+                *state |= BIT(i);
+                val = 3 - i;
+                break;
+            }
+        }
+    }
+    return val;
+}
+

+static void pnv_xive2_cache_watch_release(uint64_t *state, uint8_t 
watch_engine)

+{
+    uint8_t engine_bit = 3 - watch_engine;
+
+    if (*state & BIT(engine_bit)) {
+        *state &= ~BIT(engine_bit);
+    }
+}
+
+static uint8_t pnv_xive2_endc_cache_watch_assign(PnvXive2 *xive)
+{
+    uint64_t engine_mask = GETFIELD(VC_ENDC_CFG_CACHE_WATCH_ASSIGN,
+ xive->vc_regs[VC_ENDC_CFG >> 3]);
+    uint64_t state = xive->vc_regs[VC_ENDC_WATCH_ASSIGN >> 3];
+    uint8_t val;
+
+    /*
+     * We keep track of which engines are currently busy in the
+     * VC_ENDC_WATCH_ASSIGN register directly. When the firmware reads
+     * the register, we don't return its value but the ID of an engine
+     * it can use.
+     * There are 4 engines. 0xFF means no engine is available.
+     */
+    val = pnv_xive2_cache_watch_assign(engine_mask, &state);
+    if (val != 0xFF) {
+        xive->vc_regs[VC_ENDC_WATCH_ASSIGN >> 3] = state;
+    }
+    return val;
+}
+
+static void pnv_xive2_endc_cache_watch_release(PnvXive2 *xive,
+                                               uint8_t watch_engine)
+{
+    uint64_t state = xive->vc_regs[VC_ENDC_WATCH_ASSIGN >> 3];
+
+    pnv_xive2_cache_watch_release(&state, watch_engine);
+    xive->vc_regs[VC_ENDC_WATCH_ASSIGN >> 3] = state;
+}
+
  static uint64_t pnv_xive2_ic_vc_read(void *opaque, hwaddr offset,
                                       unsigned size)
  {
      PnvXive2 *xive = PNV_XIVE2(opaque);
      uint64_t val = 0;
      uint32_t reg = offset >> 3;
+    uint8_t watch_engine;
        switch (offset) {
      /*

@@ -1000,24 +1076,44 @@ static uint64_t pnv_xive2_ic_vc_read(void 
*opaque, hwaddr offset,

          val = xive->vc_regs[reg];
          break;
  +    case VC_ENDC_WATCH_ASSIGN:
+        val = pnv_xive2_endc_cache_watch_assign(xive);
+        break;
+
+    case VC_ENDC_CFG:
+        val = xive->vc_regs[reg];
+        break;
+
      /*
       * END cache updates
       */
      case VC_ENDC_WATCH0_SPEC:
+    case VC_ENDC_WATCH1_SPEC:
+    case VC_ENDC_WATCH2_SPEC:
+    case VC_ENDC_WATCH3_SPEC:
+        watch_engine = (offset - VC_ENDC_WATCH0_SPEC) >> 6;

          xive->vc_regs[reg] &= ~(VC_ENDC_WATCH_FULL | 
VC_ENDC_WATCH_CONFLICT);

+        pnv_xive2_endc_cache_watch_release(xive, watch_engine);
          val = xive->vc_regs[reg];
          break;
        case VC_ENDC_WATCH0_DATA0:
+    case VC_ENDC_WATCH1_DATA0:
+    case VC_ENDC_WATCH2_DATA0:
+    case VC_ENDC_WATCH3_DATA0:
          /*
           * Load DATA registers from cache with data requested by the
           * SPEC register
           */
-        pnv_xive2_end_cache_load(xive);
+        watch_engine = (offset - VC_ENDC_WATCH0_DATA0) >> 6;
+        pnv_xive2_end_cache_load(xive, watch_engine);
          val = xive->vc_regs[reg];
          break;
        case VC_ENDC_WATCH0_DATA1 ... VC_ENDC_WATCH0_DATA3:
+    case VC_ENDC_WATCH1_DATA1 ... VC_ENDC_WATCH1_DATA3:
+    case VC_ENDC_WATCH2_DATA1 ... VC_ENDC_WATCH2_DATA3:
+    case VC_ENDC_WATCH3_DATA1 ... VC_ENDC_WATCH3_DATA3:
          val = xive->vc_regs[reg];
          break;

  @@ -1063,6 +1159,7 @@ static void pnv_xive2_ic_vc_write(void 
*opaque, hwaddr offset,

  {
      PnvXive2 *xive = PNV_XIVE2(opaque);
      uint32_t reg = offset >> 3;
+    uint8_t watch_engine;
        switch (offset) {
      /*

@@ -1095,19 +1192,32 @@ static void pnv_xive2_ic_vc_write(void 
*opaque, hwaddr offset,

          /* EAS update */
          break;
  +    case VC_ENDC_CFG:
+        break;
+
      /*
       * END cache updates
       */
      case VC_ENDC_WATCH0_SPEC:
+    case VC_ENDC_WATCH1_SPEC:
+    case VC_ENDC_WATCH2_SPEC:
+    case VC_ENDC_WATCH3_SPEC:
           val &= ~VC_ENDC_WATCH_CONFLICT; /* HW will set this bit */
          break;
        case VC_ENDC_WATCH0_DATA1 ... VC_ENDC_WATCH0_DATA3:
+    case VC_ENDC_WATCH1_DATA1 ... VC_ENDC_WATCH1_DATA3:
+    case VC_ENDC_WATCH2_DATA1 ... VC_ENDC_WATCH2_DATA3:
+    case VC_ENDC_WATCH3_DATA1 ... VC_ENDC_WATCH3_DATA3:
          break;
      case VC_ENDC_WATCH0_DATA0:
+    case VC_ENDC_WATCH1_DATA0:
+    case VC_ENDC_WATCH2_DATA0:
+    case VC_ENDC_WATCH3_DATA0:
          /* writing to DATA0 triggers the cache write */
+        watch_engine = (offset - VC_ENDC_WATCH0_DATA0) >> 6;
          xive->vc_regs[reg] = val;
-        pnv_xive2_end_update(xive);
+        pnv_xive2_end_update(xive, watch_engine);
          break;

    @@ -1157,12 +1267,43 @@ static const MemoryRegionOps 
pnv_xive2_ic_vc_ops = {

      },
  };
  +static uint8_t pnv_xive2_nxc_cache_watch_assign(PnvXive2 *xive)
+{
+    uint64_t engine_mask = GETFIELD(PC_NXC_PROC_CONFIG_WATCH_ASSIGN,
+ xive->pc_regs[PC_NXC_PROC_CONFIG >> 3]);
+    uint64_t state = xive->pc_regs[PC_NXC_WATCH_ASSIGN >> 3];
+    uint8_t val;
+
+    /*
+     * We keep track of which engines are currently busy in the
+     * PC_NXC_WATCH_ASSIGN register directly. When the firmware reads
+     * the register, we don't return its value but the ID of an engine
+     * it can use.
+     * There are 4 engines. 0xFF means no engine is available.
+     */
+    val = pnv_xive2_cache_watch_assign(engine_mask, &state);
+    if (val != 0xFF) {
+        xive->pc_regs[PC_NXC_WATCH_ASSIGN >> 3] = state;
+    }
+    return val;
+}
+
+static void pnv_xive2_nxc_cache_watch_release(PnvXive2 *xive,
+                                              uint8_t watch_engine)
+{
+    uint64_t state = xive->pc_regs[PC_NXC_WATCH_ASSIGN >> 3];
+
+    pnv_xive2_cache_watch_release(&state, watch_engine);
+    xive->pc_regs[PC_NXC_WATCH_ASSIGN >> 3] = state;
+}
+
  static uint64_t pnv_xive2_ic_pc_read(void *opaque, hwaddr offset,
                                       unsigned size)
  {
      PnvXive2 *xive = PNV_XIVE2(opaque);
      uint64_t val = -1;
      uint32_t reg = offset >> 3;
+    uint8_t watch_engine;
        switch (offset) {
      /*

@@ -1173,24 +1314,44 @@ static uint64_t pnv_xive2_ic_pc_read(void 
*opaque, hwaddr offset,

          val = xive->pc_regs[reg];
          break;
  +    case PC_NXC_WATCH_ASSIGN:
+        val = pnv_xive2_nxc_cache_watch_assign(xive);
+        break;
+
+    case PC_NXC_PROC_CONFIG:
+        val = xive->pc_regs[reg];
+        break;
+
      /*
       * cache updates
       */
      case PC_NXC_WATCH0_SPEC:
+    case PC_NXC_WATCH1_SPEC:
+    case PC_NXC_WATCH2_SPEC:
+    case PC_NXC_WATCH3_SPEC:
+        watch_engine = (offset - PC_NXC_WATCH0_SPEC) >> 6;

          xive->pc_regs[reg] &= ~(PC_NXC_WATCH_FULL | 
PC_NXC_WATCH_CONFLICT);

+        pnv_xive2_nxc_cache_watch_release(xive, watch_engine);
          val = xive->pc_regs[reg];
          break;
        case PC_NXC_WATCH0_DATA0:
+    case PC_NXC_WATCH1_DATA0:
+    case PC_NXC_WATCH2_DATA0:
+    case PC_NXC_WATCH3_DATA0:
         /*
          * Load DATA registers from cache with data requested by the
          * SPEC register
          */
-        pnv_xive2_nvp_cache_load(xive);
+        watch_engine = (offset - PC_NXC_WATCH0_DATA0) >> 6;
+        pnv_xive2_nvp_cache_load(xive, watch_engine);
          val = xive->pc_regs[reg];
          break;
        case PC_NXC_WATCH0_DATA1 ... PC_NXC_WATCH0_DATA3:
+    case PC_NXC_WATCH1_DATA1 ... PC_NXC_WATCH1_DATA3:
+    case PC_NXC_WATCH2_DATA1 ... PC_NXC_WATCH2_DATA3:
+    case PC_NXC_WATCH3_DATA1 ... PC_NXC_WATCH3_DATA3:
          val = xive->pc_regs[reg];
          break;

  @@ -1219,6 +1380,7 @@ static void pnv_xive2_ic_pc_write(void 
*opaque, hwaddr offset,

  {
      PnvXive2 *xive = PNV_XIVE2(opaque);
      uint32_t reg = offset >> 3;
+    uint8_t watch_engine;
        switch (offset) {

  @@ -1231,19 +1393,32 @@ static void pnv_xive2_ic_pc_write(void 
*opaque, hwaddr offset,

      case PC_VSD_TABLE_DATA:
          break;
  +    case PC_NXC_PROC_CONFIG:
+        break;
+
      /*
       * cache updates
       */
      case PC_NXC_WATCH0_SPEC:
+    case PC_NXC_WATCH1_SPEC:
+    case PC_NXC_WATCH2_SPEC:
+    case PC_NXC_WATCH3_SPEC:
          val &= ~PC_NXC_WATCH_CONFLICT; /* HW will set this bit */
          break;
        case PC_NXC_WATCH0_DATA1 ... PC_NXC_WATCH0_DATA3:
+    case PC_NXC_WATCH1_DATA1 ... PC_NXC_WATCH1_DATA3:
+    case PC_NXC_WATCH2_DATA1 ... PC_NXC_WATCH2_DATA3:
+    case PC_NXC_WATCH3_DATA1 ... PC_NXC_WATCH3_DATA3:
          break;
      case PC_NXC_WATCH0_DATA0:
+    case PC_NXC_WATCH1_DATA0:
+    case PC_NXC_WATCH2_DATA0:
+    case PC_NXC_WATCH3_DATA0:
          /* writing to DATA0 triggers the cache write */
+        watch_engine = (offset - PC_NXC_WATCH0_DATA0) >> 6;
          xive->pc_regs[reg] = val;
-        pnv_xive2_nvp_update(xive);
+        pnv_xive2_nvp_update(xive, watch_engine);
          break;
       /* case PC_NXC_FLUSH_CTRL: */
@@ -1814,6 +1989,12 @@ static void pnv_xive2_reset(void *dev)
      xive->cq_regs[CQ_XIVE_CFG >> 3] |=

          SETFIELD(CQ_XIVE_CFG_HYP_HARD_BLOCK_ID, 0ull, 
xive->chip->chip_id);

  +    /* VC and PC cache watch assign mechanism */
+    xive->vc_regs[VC_ENDC_CFG >> 3] =
+        SETFIELD(VC_ENDC_CFG_CACHE_WATCH_ASSIGN, 0ull, 0b0111);
+    xive->pc_regs[PC_NXC_PROC_CONFIG >> 3] =
+        SETFIELD(PC_NXC_PROC_CONFIG_WATCH_ASSIGN, 0ull, 0b0111);
+
      /* Set default page size to 64k */
      xive->ic_shift = xive->esb_shift = xive->end_shift = 16;
      xive->nvc_shift = xive->nvpg_shift = xive->tm_shift = 16;



























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