[SPARC64]: Add hypervisor API negotiation and fix console bugs.

Hypervisor interfaces need to be negotiated in order to use
some API calls reliably.  So add a small set of interfaces
to request API versions and query current settings.

This allows us to fix some bugs in the hypervisor console:

1) If we can negotiate API group CORE of at least major 1
   minor 1 we can use con_read and con_write which can improve
   console performance quite a bit.

2) When we do a console write request, we should hold the
   spinlock around the whole request, not a byte at a time.
   What would happen is that it's easy for output from
   different cpus to get mixed with each other.

3) Use consistent udelay() based polling, udelay(1) each
   loop with a limit of 1000 polls to handle stuck hypervisor
   console.

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 82 insertions, 1 deletions

diff --git a/include/asm-sparc64/hypervisor.h b/include/asm-sparc64/hypervisor.h
index 612bf319753f..a5558c87556d 100644
--- a/include/asm-sparc64/hypervisor.h
+++ b/include/asm-sparc64/hypervisor.h
@@ -940,6 +940,54 @@ struct hv_fault_status {
  */
 #define HV_FAST_CONS_PUTCHAR            0x61
 
+/* con_read()
+ * TRAP:        HV_FAST_TRAP
+ * FUNCTION:    HV_FAST_CONS_READ
+ * ARG0:        buffer real address
+ * ARG1:        buffer size in bytes
+ * RET0:        status
+ * RET1:        bytes read or BREAK or HUP
+ * ERRORS:      EWOULDBLOCK     No character available.
+ *
+ * Reads characters into a buffer from the console device.  If no
+ * character is available then an EWOULDBLOCK error is returned.
+ * If a character is available, then the returned status is EOK
+ * and the number of bytes read into the given buffer is provided
+ * in RET1.
+ *
+ * A virtual BREAK is represented by the 64-bit RET1 value -1.
+ *
+ * A virtual HUP signal is represented by the 64-bit RET1 value -2.
+ *
+ * If BREAK or HUP are indicated, no bytes were read into buffer.
+ */
+#define HV_FAST_CONS_READ               0x62
+
+/* con_write()
+ * TRAP:        HV_FAST_TRAP
+ * FUNCTION:    HV_FAST_CONS_WRITE
+ * ARG0:        buffer real address
+ * ARG1:        buffer size in bytes
+ * RET0:        status
+ * RET1:        bytes written
+ * ERRORS:      EWOULDBLOCK     Output buffer currently full, would block
+ *
+ * Send a characters in buffer to the console device.  Breaks must be
+ * sent using con_putchar().
+ */
+#define HV_FAST_CONS_WRITE              0x63
+
+#ifndef __ASSEMBLY__
+extern long sun4v_con_getchar(long *status);
+extern long sun4v_con_putchar(long c);
+extern long sun4v_con_read(unsigned long buffer,
+                           unsigned long size,
+                           unsigned long *bytes_read);
+extern unsigned long sun4v_con_write(unsigned long buffer,
+                                     unsigned long size,
+                                     unsigned long *bytes_written);
+#endif
+
 /* Trap trace services.
  *
  * The hypervisor provides a trap tracing capability for privileged
@@ -2121,8 +2169,41 @@ struct hv_mmu_statistics {
 #define HV_FAST_MMUSTAT_INFO            0x103
 
 /* Function numbers for HV_CORE_TRAP.  */
-#define HV_CORE_VER                     0x00
+#define HV_CORE_SET_VER                 0x00
 #define HV_CORE_PUTCHAR                 0x01
 #define HV_CORE_EXIT                    0x02
+#define HV_CORE_GET_VER                 0x03
+
+/* Hypervisor API groups for use with HV_CORE_SET_VER and
+ * HV_CORE_GET_VER.
+ */
+#define HV_GRP_SUN4V                    0x0000
+#define HV_GRP_CORE                     0x0001
+#define HV_GRP_INTR                     0x0002
+#define HV_GRP_SOFT_STATE               0x0003
+#define HV_GRP_PCI                      0x0100
+#define HV_GRP_LDOM                     0x0101
+#define HV_GRP_SVC_CHAN                 0x0102
+#define HV_GRP_NCS                      0x0103
+#define HV_GRP_NIAG_PERF                0x0200
+#define HV_GRP_FIRE_PERF                0x0201
+#define HV_GRP_DIAG                     0x0300
+
+#ifndef __ASSEMBLY__
+extern unsigned long sun4v_get_version(unsigned long group,
+                                       unsigned long *major,
+                                       unsigned long *minor);
+extern unsigned long sun4v_set_version(unsigned long group,
+                                       unsigned long major,
+                                       unsigned long minor,
+                                       unsigned long *actual_minor);
+
+extern int sun4v_hvapi_register(unsigned long group, unsigned long major,
+                                unsigned long *minor);
+extern void sun4v_hvapi_unregister(unsigned long group);
+extern int sun4v_hvapi_get(unsigned long group,
+                           unsigned long *major,
+                           unsigned long *minor);
+#endif
 
 #endif /* !(_SPARC64_HYPERVISOR_H) */