powerpc: Add dispatch trace log fields to lppaca

PAPR v2.3 defines fields in the virtual processor area for a dispatch
trace log (DLT). Since we'd like to use the DLT, add the necessary
fields to struct lppaca.

Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

diff --git a/arch/powerpc/include/asm/lppaca.h b/arch/powerpc/include/asm/lppaca.h
index b063121abb3ba1a50dcd779b9ee3e56b6c645cdc..68235f7e4a8fabb4febe5302adee68e6a20d1d64 100644 (file)
--- a/arch/powerpc/include/asm/lppaca.h
+++ b/arch/powerpc/include/asm/lppaca.h
@@ -97,7 +97,7 @@ struct lppaca {
        u64     saved_gpr4;             // Saved GPR4                   x28-x2F
        u64     saved_gpr5;             // Saved GPR5                   x30-x37
 
-       u8      reserved4;              // Reserved                     x38-x38
+       u8      dtl_enable_mask;        // Dispatch Trace Log mask      x38-x38
        u8      donate_dedicated_cpu;   // Donate dedicated CPU cycles  x39-x39
        u8      fpregs_in_use;          // FP regs in use               x3A-x3A
        u8      pmcregs_in_use;         // PMC regs in use              x3B-x3B
@@ -134,7 +134,9 @@ struct lppaca {
 // CACHE_LINE_4-5 0x0180 - 0x027F Contains PMC interrupt data
 //=============================================================================
        u32     page_ins;               // CMO Hint - # page ins by OS  x00-x03
-       u8      pmc_save_area[252];     // PMC interrupt Area           x04-xFF
+       u8      reserved8[148];         // Reserved                     x04-x97
+       volatile u64 dtl_idx;           // Dispatch Trace Log head idx  x98-x9F
+       u8      reserved9[96];          // Reserved                     xA0-xFF
 } __attribute__((__aligned__(0x400)));
 
 extern struct lppaca lppaca[];