[PULL 50/67] ppc/xive2: Support TIMA "Pull OS Context to Odd Thread Reporting Line"

[Nicholas Piggin <npiggin@gmail.com>]

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

Adds support for single byte writes to offset 0xC18 of the TIMA address
space.  When this offset is written to, the hardware disables the OS
context and copies the current state information to the odd cache line
of the pair specified by the NVT structure indexed by the OS CAM entry.

Signed-off-by: Frederic Barrat <fbarrat@linux.ibm.com>
Signed-off-by: Michael Kowal <kowal@linux.vnet.ibm.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
---
 hw/intc/xive.c              |   2 +
 hw/intc/xive2.c             | 160 ++++++++++++++++++++++++++++++------
 include/hw/ppc/xive2.h      |   2 +
 include/hw/ppc/xive2_regs.h |   2 +
 include/hw/ppc/xive_regs.h  |   3 +
 5 files changed, 142 insertions(+), 27 deletions(-)

diff --git a/hw/intc/xive.c b/hw/intc/xive.c
index 0e81678ab3..4532cfc467 100644
--- a/hw/intc/xive.c
+++ b/hw/intc/xive.c
@@ -547,6 +547,8 @@ static const XiveTmOp xive2_tm_operations[] = {
                                                      xive_tm_pull_pool_ctx },
     { XIVE_TM_HV_PAGE, TM_SPC_PULL_POOL_CTX,      8, NULL,
                                                      xive_tm_pull_pool_ctx },
+    { XIVE_TM_HV_PAGE, TM_SPC_PULL_OS_CTX_OL,     1, xive2_tm_pull_os_ctx_ol,
+                                                     NULL },
 };
 
 static const XiveTmOp *xive_tm_find_op(XivePresenter *xptr, hwaddr offset,
diff --git a/hw/intc/xive2.c b/hw/intc/xive2.c
index 1f150685bf..fbd05aa9f5 100644
--- a/hw/intc/xive2.c
+++ b/hw/intc/xive2.c
@@ -26,6 +26,23 @@ uint32_t xive2_router_get_config(Xive2Router *xrtr)
     return xrc->get_config(xrtr);
 }
 
+static int xive2_router_get_block_id(Xive2Router *xrtr)
+{
+   Xive2RouterClass *xrc = XIVE2_ROUTER_GET_CLASS(xrtr);
+
+   return xrc->get_block_id(xrtr);
+}
+
+static uint64_t xive2_nvp_reporting_addr(Xive2Nvp *nvp)
+{
+    uint64_t cache_addr;
+
+    cache_addr = xive_get_field32(NVP2_W6_REPORTING_LINE, nvp->w6) << 24 |
+        xive_get_field32(NVP2_W7_REPORTING_LINE, nvp->w7);
+    cache_addr <<= 8; /* aligned on a cache line pair */
+    return cache_addr;
+}
+
 void xive2_eas_pic_print_info(Xive2Eas *eas, uint32_t lisn, GString *buf)
 {
     if (!xive2_eas_is_valid(eas)) {
@@ -270,6 +287,27 @@ static void xive2_os_cam_decode(uint32_t cam, uint8_t *nvp_blk,
     *ho = !!(cam & TM2_QW1W2_HO);
 }
 
+
+/*
+ * Encode the HW CAM line with 7bit or 8bit thread id. The thread id
+ * width and block id width is configurable at the IC level.
+ *
+ *    chipid << 24 | 0000 0000 0000 0000 1 threadid (7Bit)
+ *    chipid << 24 | 0000 0000 0000 0001 threadid   (8Bit)
+ */
+static uint32_t xive2_tctx_hw_cam_line(XivePresenter *xptr, XiveTCTX *tctx)
+{
+    Xive2Router *xrtr = XIVE2_ROUTER(xptr);
+    CPUPPCState *env = &POWERPC_CPU(tctx->cs)->env;
+    uint32_t pir = env->spr_cb[SPR_PIR].default_value;
+    uint8_t blk = xive2_router_get_block_id(xrtr);
+    uint8_t tid_shift =
+        xive2_router_get_config(xrtr) & XIVE2_THREADID_8BITS ? 8 : 7;
+    uint8_t tid_mask = (1 << tid_shift) - 1;
+
+    return xive2_nvp_cam_line(blk, 1 << tid_shift | (pir & tid_mask));
+}
+
 uint64_t xive2_tm_pull_os_ctx(XivePresenter *xptr, XiveTCTX *tctx,
                               hwaddr offset, unsigned size)
 {
@@ -301,6 +339,101 @@ uint64_t xive2_tm_pull_os_ctx(XivePresenter *xptr, XiveTCTX *tctx,
     return qw1w2;
 }
 
+#define REPORT_LINE_GEN1_SIZE       16
+
+static void xive2_tm_report_line_gen1(XiveTCTX *tctx, uint8_t *data,
+                                      uint8_t size)
+{
+    uint8_t *regs = tctx->regs;
+
+    g_assert(size == REPORT_LINE_GEN1_SIZE);
+    memset(data, 0, size);
+    /*
+     * See xive architecture for description of what is saved. It is
+     * hand-picked information to fit in 16 bytes.
+     */
+    data[0x0] = regs[TM_QW3_HV_PHYS + TM_NSR];
+    data[0x1] = regs[TM_QW3_HV_PHYS + TM_CPPR];
+    data[0x2] = regs[TM_QW3_HV_PHYS + TM_IPB];
+    data[0x3] = regs[TM_QW2_HV_POOL + TM_IPB];
+    data[0x4] = regs[TM_QW1_OS + TM_ACK_CNT];
+    data[0x5] = regs[TM_QW3_HV_PHYS + TM_LGS];
+    data[0x6] = 0xFF;
+    data[0x7] = regs[TM_QW3_HV_PHYS + TM_WORD2] & 0x80;
+    data[0x7] |= (regs[TM_QW2_HV_POOL + TM_WORD2] & 0x80) >> 1;
+    data[0x7] |= (regs[TM_QW1_OS + TM_WORD2] & 0x80) >> 2;
+    data[0x7] |= (regs[TM_QW3_HV_PHYS + TM_WORD2] & 0x3);
+    data[0x8] = regs[TM_QW1_OS + TM_NSR];
+    data[0x9] = regs[TM_QW1_OS + TM_CPPR];
+    data[0xA] = regs[TM_QW1_OS + TM_IPB];
+    data[0xB] = regs[TM_QW1_OS + TM_LGS];
+    if (regs[TM_QW0_USER + TM_WORD2] & 0x80) {
+        /*
+         * Logical server extension, except VU bit replaced by EB bit
+         * from NSR
+         */
+        data[0xC] = regs[TM_QW0_USER + TM_WORD2];
+        data[0xC] &= ~0x80;
+        data[0xC] |= regs[TM_QW0_USER + TM_NSR] & 0x80;
+        data[0xD] = regs[TM_QW0_USER + TM_WORD2 + 1];
+        data[0xE] = regs[TM_QW0_USER + TM_WORD2 + 2];
+        data[0xF] = regs[TM_QW0_USER + TM_WORD2 + 3];
+    }
+}
+
+void xive2_tm_pull_os_ctx_ol(XivePresenter *xptr, XiveTCTX *tctx,
+                             hwaddr offset, uint64_t value, unsigned size)
+{
+    Xive2Router *xrtr = XIVE2_ROUTER(xptr);
+    uint32_t hw_cam, nvp_idx, xive2_cfg, reserved;
+    uint8_t nvp_blk;
+    Xive2Nvp nvp;
+    uint64_t phys_addr;
+    MemTxResult result;
+
+    hw_cam = xive2_tctx_hw_cam_line(xptr, tctx);
+    nvp_blk = xive2_nvp_blk(hw_cam);
+    nvp_idx = xive2_nvp_idx(hw_cam);
+
+    if (xive2_router_get_nvp(xrtr, nvp_blk, nvp_idx, &nvp)) {
+        qemu_log_mask(LOG_GUEST_ERROR, "XIVE: No NVP %x/%x\n",
+                      nvp_blk, nvp_idx);
+        return;
+    }
+
+    if (!xive2_nvp_is_valid(&nvp)) {
+        qemu_log_mask(LOG_GUEST_ERROR, "XIVE: invalid NVP %x/%x\n",
+                      nvp_blk, nvp_idx);
+        return;
+    }
+
+    xive2_cfg = xive2_router_get_config(xrtr);
+
+    phys_addr = xive2_nvp_reporting_addr(&nvp) + 0x80; /* odd line */
+    if (xive2_cfg & XIVE2_GEN1_TIMA_OS) {
+        uint8_t pull_ctxt[REPORT_LINE_GEN1_SIZE];
+
+        xive2_tm_report_line_gen1(tctx, pull_ctxt, REPORT_LINE_GEN1_SIZE);
+        result = dma_memory_write(&address_space_memory, phys_addr,
+                                  pull_ctxt, REPORT_LINE_GEN1_SIZE,
+                                  MEMTXATTRS_UNSPECIFIED);
+        assert(result == MEMTX_OK);
+    } else {
+        result = dma_memory_write(&address_space_memory, phys_addr,
+                                  &tctx->regs, sizeof(tctx->regs),
+                                  MEMTXATTRS_UNSPECIFIED);
+        assert(result == MEMTX_OK);
+        reserved = 0xFFFFFFFF;
+        result = dma_memory_write(&address_space_memory, phys_addr + 12,
+                                  &reserved, sizeof(reserved),
+                                  MEMTXATTRS_UNSPECIFIED);
+        assert(result == MEMTX_OK);
+    }
+
+    /* the rest is similar to pull OS context to registers */
+    xive2_tm_pull_os_ctx(xptr, tctx, offset, size);
+}
+
 static uint8_t xive2_tctx_restore_os_ctx(Xive2Router *xrtr, XiveTCTX *tctx,
                                         uint8_t nvp_blk, uint32_t nvp_idx,
                                         Xive2Nvp *nvp)
@@ -471,33 +604,6 @@ int xive2_router_write_nvp(Xive2Router *xrtr, uint8_t nvp_blk, uint32_t nvp_idx,
    return xrc->write_nvp(xrtr, nvp_blk, nvp_idx, nvp, word_number);
 }
 
-static int xive2_router_get_block_id(Xive2Router *xrtr)
-{
-   Xive2RouterClass *xrc = XIVE2_ROUTER_GET_CLASS(xrtr);
-
-   return xrc->get_block_id(xrtr);
-}
-
-/*
- * Encode the HW CAM line with 7bit or 8bit thread id. The thread id
- * width and block id width is configurable at the IC level.
- *
- *    chipid << 24 | 0000 0000 0000 0000 1 threadid (7Bit)
- *    chipid << 24 | 0000 0000 0000 0001 threadid   (8Bit)
- */
-static uint32_t xive2_tctx_hw_cam_line(XivePresenter *xptr, XiveTCTX *tctx)
-{
-    Xive2Router *xrtr = XIVE2_ROUTER(xptr);
-    CPUPPCState *env = &POWERPC_CPU(tctx->cs)->env;
-    uint32_t pir = env->spr_cb[SPR_PIR].default_value;
-    uint8_t blk = xive2_router_get_block_id(xrtr);
-    uint8_t tid_shift =
-        xive2_router_get_config(xrtr) & XIVE2_THREADID_8BITS ? 8 : 7;
-    uint8_t tid_mask = (1 << tid_shift) - 1;
-
-    return xive2_nvp_cam_line(blk, 1 << tid_shift | (pir & tid_mask));
-}
-
 /*
  * The thread context register words are in big-endian format.
  */
diff --git a/include/hw/ppc/xive2.h b/include/hw/ppc/xive2.h
index ab68f8d157..654f485e9b 100644
--- a/include/hw/ppc/xive2.h
+++ b/include/hw/ppc/xive2.h
@@ -107,5 +107,7 @@ void xive2_tm_push_os_ctx(XivePresenter *xptr, XiveTCTX *tctx, hwaddr offset,
                            uint64_t value, unsigned size);
 uint64_t xive2_tm_pull_os_ctx(XivePresenter *xptr, XiveTCTX *tctx,
                                hwaddr offset, unsigned size);
+void xive2_tm_pull_os_ctx_ol(XivePresenter *xptr, XiveTCTX *tctx,
+                             hwaddr offset, uint64_t value, unsigned size);
 
 #endif /* PPC_XIVE2_H */
diff --git a/include/hw/ppc/xive2_regs.h b/include/hw/ppc/xive2_regs.h
index 4349d009d0..7acf7dccf3 100644
--- a/include/hw/ppc/xive2_regs.h
+++ b/include/hw/ppc/xive2_regs.h
@@ -171,7 +171,9 @@ typedef struct Xive2Nvp {
 #define NVP2_W5_VP_END_BLOCK       PPC_BITMASK32(4, 7)
 #define NVP2_W5_VP_END_INDEX       PPC_BITMASK32(8, 31)
         uint32_t       w6;
+#define NVP2_W6_REPORTING_LINE     PPC_BITMASK32(4, 31)
         uint32_t       w7;
+#define NVP2_W7_REPORTING_LINE     PPC_BITMASK32(0, 23)
 } Xive2Nvp;
 
 #define xive2_nvp_is_valid(nvp)    (be32_to_cpu((nvp)->w0) & NVP2_W0_VALID)
diff --git a/include/hw/ppc/xive_regs.h b/include/hw/ppc/xive_regs.h
index 9062c6abf6..27a744d50d 100644
--- a/include/hw/ppc/xive_regs.h
+++ b/include/hw/ppc/xive_regs.h
@@ -77,6 +77,7 @@
 #define TM_LSMFB                0x3  /*  -   +   +   +  */
 #define TM_ACK_CNT              0x4  /*  -   +   -   -  */
 #define TM_INC                  0x5  /*  -   +   -   +  */
+#define TM_LGS                  0x5  /*  +   +   +   +  */ /* Rename P10 */
 #define TM_AGE                  0x6  /*  -   +   -   +  */
 #define TM_PIPR                 0x7  /*  -   +   -   +  */
 #define TM_OGEN                 0xF  /*  -   +   -   -  */ /* P10 only */
@@ -129,6 +130,8 @@
 #define TM_SPC_PULL_USR_CTX_OL  0xc08   /* Store8 Pull/Inval usr ctx to odd   */
                                         /* line                               */
 #define TM_SPC_ACK_OS_EL        0xc10   /* Store8 ack OS irq to even line     */
+#define TM_SPC_PULL_OS_CTX_OL   0xc18   /* Pull/Invalidate OS context to      */
+                                        /* odd Thread reporting line          */
 #define TM_SPC_ACK_HV_POOL_EL   0xc20   /* Store8 ack HV evt pool to even     */
                                         /* line                               */
 #define TM_SPC_ACK_HV_EL        0xc30   /* Store8 ack HV irq to even line     */
-- 
2.45.2