Merge branch 'stable' of git://git.kernel.org/pub/scm/linux/kernel/git/cmetcalf/linux-tile

Pull tile update from Chris Metcalf:
 "The interesting bug fix is support for the upcoming "4.2" release of
  the Tilera hypervisor, which by default launches Linux at privilege
  level 2 instead of 1.  The fix lets new and old hypervisors and
  Linuxes interoperate more smoothly, so I've tagged it for
  stable@kernel.org so that older Linuxes will be able to boot under the
  newer hypervisor."

* 'stable' of git://git.kernel.org/pub/scm/linux/kernel/git/cmetcalf/linux-tile:
  usb: tilegx: fix memleak when create hcd fail
  arch/tile: remove inline marking of EXPORT_SYMBOL functions
  rtc: rtc-tile: add missing platform_device_unregister() when module exit
  tile: support new Tilera hypervisor

5 files changed, 45 insertions, 12 deletions

diff --git a/arch/tile/Kconfig b/arch/tile/Kconfig
index 5b6a40dd5556..3aa37669ff8c 100644
--- a/arch/tile/Kconfig
+++ b/arch/tile/Kconfig
@@ -355,11 +355,17 @@ config HARDWALL
 config KERNEL_PL
         int "Processor protection level for kernel"
         range 1 2
-        default "1"
+        default 2 if TILEGX
+        default 1 if !TILEGX
         ---help---
-          This setting determines the processor protection level the
-          kernel will be built to run at.  Generally you should use
-          the default value here.
+          Since MDE 4.2, the Tilera hypervisor runs the kernel
+          at PL2 by default.  If running under an older hypervisor,
+          or as a KVM guest, you must run at PL1.  (The current
+          hypervisor may also be recompiled with "make HV_PL=2" to
+          allow it to run a kernel at PL1, but clients running at PL1
+          are not expected to be supported indefinitely.)
+
+          If you're not sure, don't change the default.
 
 source "arch/tile/gxio/Kconfig"
 
diff --git a/arch/tile/include/hv/hypervisor.h b/arch/tile/include/hv/hypervisor.h
index ccd847e2347f..837dca5328c2 100644
--- a/arch/tile/include/hv/hypervisor.h
+++ b/arch/tile/include/hv/hypervisor.h
@@ -107,7 +107,22 @@
 #define HV_DISPATCH_ENTRY_SIZE 32
 
 /** Version of the hypervisor interface defined by this file */
-#define _HV_VERSION 11
+#define _HV_VERSION 13
+
+/** Last version of the hypervisor interface with old hv_init() ABI.
+ *
+ * The change from version 12 to version 13 corresponds to launching
+ * the client by default at PL2 instead of PL1 (corresponding to the
+ * hv itself running at PL3 instead of PL2).  To make this explicit,
+ * the hv_init() API was also extended so the client can report its
+ * desired PL, resulting in a more helpful failure diagnostic.  If you
+ * call hv_init() with _HV_VERSION_OLD_HV_INIT and omit the client_pl
+ * argument, the hypervisor will assume client_pl = 1.
+ *
+ * Note that this is a deprecated solution and we do not expect to
+ * support clients of the Tilera hypervisor running at PL1 indefinitely.
+ */
+#define _HV_VERSION_OLD_HV_INIT 12
 
 /* Index into hypervisor interface dispatch code blocks.
  *
@@ -377,7 +392,11 @@ typedef int HV_Errno;
 #ifndef __ASSEMBLER__
 
 /** Pass HV_VERSION to hv_init to request this version of the interface. */
-typedef enum { HV_VERSION = _HV_VERSION } HV_VersionNumber;
+typedef enum {
+  HV_VERSION = _HV_VERSION,
+  HV_VERSION_OLD_HV_INIT = _HV_VERSION_OLD_HV_INIT,
+
+} HV_VersionNumber;
 
 /** Initializes the hypervisor.
  *
@@ -385,9 +404,11 @@ typedef enum { HV_VERSION = _HV_VERSION } HV_VersionNumber;
  * that this program expects, typically HV_VERSION.
  * @param chip_num Architecture number of the chip the client was built for.
  * @param chip_rev_num Revision number of the chip the client was built for.
+ * @param client_pl Privilege level the client is built for
+ *   (not required if interface_version_number == HV_VERSION_OLD_HV_INIT).
  */
 void hv_init(HV_VersionNumber interface_version_number,
-             int chip_num, int chip_rev_num);
+             int chip_num, int chip_rev_num, int client_pl);
 
 
 /** Queries we can make for hv_sysconf().
diff --git a/arch/tile/kernel/head_32.S b/arch/tile/kernel/head_32.S
index f71bfeeaf1a9..ac115307e5e4 100644
--- a/arch/tile/kernel/head_32.S
+++ b/arch/tile/kernel/head_32.S
@@ -38,7 +38,7 @@ ENTRY(_start)
           movei r2, TILE_CHIP_REV
         }
         {
-          moveli r0, _HV_VERSION
+          moveli r0, _HV_VERSION_OLD_HV_INIT
           jal hv_init
         }
         /* Get a reasonable default ASID in r0 */
diff --git a/arch/tile/kernel/head_64.S b/arch/tile/kernel/head_64.S
index f9a2734f7b82..6093964fa5c7 100644
--- a/arch/tile/kernel/head_64.S
+++ b/arch/tile/kernel/head_64.S
@@ -34,13 +34,19 @@
 ENTRY(_start)
         /* Notify the hypervisor of what version of the API we want */
         {
+#if KERNEL_PL == 1 && _HV_VERSION == 13
+          /* Support older hypervisors by asking for API version 12. */
+          movei r0, _HV_VERSION_OLD_HV_INIT
+#else
+          movei r0, _HV_VERSION
+#endif
           movei r1, TILE_CHIP
-          movei r2, TILE_CHIP_REV
         }
         {
-          moveli r0, _HV_VERSION
-          jal hv_init
+          movei r2, TILE_CHIP_REV
+          movei r3, KERNEL_PL
         }
+        jal hv_init
         /* Get a reasonable default ASID in r0 */
         {
           move r0, zero
diff --git a/arch/tile/lib/spinlock_32.c b/arch/tile/lib/spinlock_32.c
index b16ac49a968e..b34f79aada48 100644
--- a/arch/tile/lib/spinlock_32.c
+++ b/arch/tile/lib/spinlock_32.c
@@ -101,7 +101,7 @@ EXPORT_SYMBOL(arch_spin_unlock_wait);
  * preserve the semantic that the same read lock can be acquired in an
  * interrupt context.
  */
-inline int arch_read_trylock(arch_rwlock_t *rwlock)
+int arch_read_trylock(arch_rwlock_t *rwlock)
 {
         u32 val;
         __insn_mtspr(SPR_INTERRUPT_CRITICAL_SECTION, 1);