Merge tag 'powerpc-6.4-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux

Pull powerpc updates from Michael Ellerman:

 - Add support for building the kernel using PC-relative addressing on
   Power10.

 - Allow HV KVM guests on Power10 to use prefixed instructions.

 - Unify support for the P2020 CPU (85xx) into a single machine
   description.

 - Always build the 64-bit kernel with 128-bit long double.

 - Drop support for several obsolete 2000's era development boards as
   identified by Paul Gortmaker.

 - A series fixing VFIO on Power since some generic changes.

 - Various other small features and fixes.

Thanks to Alexey Kardashevskiy, Andrew Donnellan, Benjamin Gray, Bo Liu,
Christophe Leroy, Dan Carpenter, David Binderman, Ira Weiny, Joel
Stanley, Kajol Jain, Kautuk Consul, Liang He, Luis Chamberlain, Masahiro
Yamada, Michael Neuling, Nathan Chancellor, Nathan Lynch, Nicholas
Miehlbradt, Nicholas Piggin, Nick Desaulniers, Nysal Jan K.A, Pali
Rohár, Paul Gortmaker, Paul Mackerras, Petr Vaněk, Randy Dunlap, Rob
Herring, Sachin Sant, Sean Christopherson, Segher Boessenkool, and
Timothy Pearson.

* tag 'powerpc-6.4-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux: (156 commits)
  powerpc/64s: Disable pcrel code model on Clang
  powerpc: Fix merge conflict between pcrel and copy_thread changes
  powerpc/configs/powernv: Add IGB=y
  powerpc/configs/64s: Drop JFS Filesystem
  powerpc/configs/64s: Use EXT4 to mount EXT2 filesystems
  powerpc/configs: Make pseries_defconfig an alias for ppc64le_guest
  powerpc/configs: Make pseries_le an alias for ppc64le_guest
  powerpc/configs: Incorporate generic kvm_guest.config into guest configs
  powerpc/configs: Add IBMVETH=y and IBMVNIC=y to guest configs
  powerpc/configs/64s: Enable Device Mapper options
  powerpc/configs/64s: Enable PSTORE
  powerpc/configs/64s: Enable VLAN support
  powerpc/configs/64s: Enable BLK_DEV_NVME
  powerpc/configs/64s: Drop REISERFS
  powerpc/configs/64s: Use SHA512 for module signatures
  powerpc/configs/64s: Enable IO_STRICT_DEVMEM
  powerpc/configs/64s: Enable SCHEDSTATS
  powerpc/configs/64s: Enable DEBUG_VM & other options
  powerpc/configs/64s: Enable EMULATED_STATS
  powerpc/configs/64s: Enable KUNIT and most tests
  ...

1 files changed, 42 insertions, 12 deletions

diff --git a/arch/powerpc/kernel/rtas.c b/arch/powerpc/kernel/rtas.c
index 31175b34856a..c087eeee320f 100644
--- a/arch/powerpc/kernel/rtas.c
+++ b/arch/powerpc/kernel/rtas.c
@@ -16,6 +16,7 @@
 #include <linux/init.h>
 #include <linux/kconfig.h>
 #include <linux/kernel.h>
+#include <linux/lockdep.h>
 #include <linux/memblock.h>
 #include <linux/of.h>
 #include <linux/of_fdt.h>
@@ -68,7 +69,7 @@ struct rtas_filter {
  *                            functions are believed to have no users on
  *                            ppc64le, and we want to keep it that way. It does
  *                            not make sense for this to be set when @filter
- *                            is false.
+ *                            is NULL.
  */
 struct rtas_function {
 	s32 token;
@@ -453,6 +454,16 @@ static struct rtas_function rtas_function_table[] __ro_after_init = {
 	},
 };
 
+/*
+ * Nearly all RTAS calls need to be serialized. All uses of the
+ * default rtas_args block must hold rtas_lock.
+ *
+ * Exceptions to the RTAS serialization requirement (e.g. stop-self)
+ * must use a separate rtas_args structure.
+ */
+static DEFINE_RAW_SPINLOCK(rtas_lock);
+static struct rtas_args rtas_args;
+
 /**
  * rtas_function_token() - RTAS function token lookup.
  * @handle: Function handle, e.g. RTAS_FN_EVENT_SCAN.
@@ -560,6 +571,9 @@ static void __do_enter_rtas(struct rtas_args *args)
 static void __do_enter_rtas_trace(struct rtas_args *args)
 {
 	const char *name = NULL;
+
+	if (args == &rtas_args)
+		lockdep_assert_held(&rtas_lock);
 	/*
 	 * If the tracepoints that consume the function name aren't
 	 * active, avoid the lookup.
@@ -619,16 +633,6 @@ static void do_enter_rtas(struct rtas_args *args)
 
 struct rtas_t rtas;
 
-/*
- * Nearly all RTAS calls need to be serialized. All uses of the
- * default rtas_args block must hold rtas_lock.
- *
- * Exceptions to the RTAS serialization requirement (e.g. stop-self)
- * must use a separate rtas_args structure.
- */
-static DEFINE_RAW_SPINLOCK(rtas_lock);
-static struct rtas_args rtas_args;
-
 DEFINE_SPINLOCK(rtas_data_buf_lock);
 EXPORT_SYMBOL_GPL(rtas_data_buf_lock);
 
@@ -951,6 +955,8 @@ static char *__fetch_rtas_last_error(char *altbuf)
 	u32 bufsz;
 	char *buf = NULL;
 
+	lockdep_assert_held(&rtas_lock);
+
 	if (token == -1)
 		return NULL;
 
@@ -981,7 +987,7 @@ static char *__fetch_rtas_last_error(char *altbuf)
 				buf = kmalloc(RTAS_ERROR_LOG_MAX, GFP_ATOMIC);
 		}
 		if (buf)
-			memcpy(buf, rtas_err_buf, RTAS_ERROR_LOG_MAX);
+			memmove(buf, rtas_err_buf, RTAS_ERROR_LOG_MAX);
 	}
 
 	return buf;
@@ -1016,6 +1022,23 @@ va_rtas_call_unlocked(struct rtas_args *args, int token, int nargs, int nret,
 	do_enter_rtas(args);
 }
 
+/**
+ * rtas_call_unlocked() - Invoke an RTAS firmware function without synchronization.
+ * @args: RTAS parameter block to be used for the call, must obey RTAS addressing
+ *        constraints.
+ * @token: Identifies the function being invoked.
+ * @nargs: Number of input parameters. Does not include token.
+ * @nret: Number of output parameters, including the call status.
+ * @....: List of @nargs input parameters.
+ *
+ * Invokes the RTAS function indicated by @token, which the caller
+ * should obtain via rtas_function_token().
+ *
+ * This function is similar to rtas_call(), but must be used with a
+ * limited set of RTAS calls specifically exempted from the general
+ * requirement that only one RTAS call may be in progress at any
+ * time. Examples include stop-self and ibm,nmi-interlock.
+ */
 void rtas_call_unlocked(struct rtas_args *args, int token, int nargs, int nret, ...)
 {
 	va_list list;
@@ -1091,6 +1114,7 @@ static bool token_is_restricted_errinjct(s32 token)
  */
 int rtas_call(int token, int nargs, int nret, int *outputs, ...)
 {
+	struct pin_cookie cookie;
 	va_list list;
 	int i;
 	unsigned long flags;
@@ -1117,6 +1141,8 @@ int rtas_call(int token, int nargs, int nret, int *outputs, ...)
 	}
 
 	raw_spin_lock_irqsave(&rtas_lock, flags);
+	cookie = lockdep_pin_lock(&rtas_lock);
+
 	/* We use the global rtas args buffer */
 	args = &rtas_args;
 
@@ -1134,6 +1160,7 @@ int rtas_call(int token, int nargs, int nret, int *outputs, ...)
 			outputs[i] = be32_to_cpu(args->rets[i + 1]);
 	ret = (nret > 0) ? be32_to_cpu(args->rets[0]) : 0;
 
+	lockdep_unpin_lock(&rtas_lock, cookie);
 	raw_spin_unlock_irqrestore(&rtas_lock, flags);
 
 	if (buff_copy) {
@@ -1765,6 +1792,7 @@ err:
 /* We assume to be passed big endian arguments */
 SYSCALL_DEFINE1(rtas, struct rtas_args __user *, uargs)
 {
+	struct pin_cookie cookie;
 	struct rtas_args args;
 	unsigned long flags;
 	char *buff_copy, *errbuf = NULL;
@@ -1833,6 +1861,7 @@ SYSCALL_DEFINE1(rtas, struct rtas_args __user *, uargs)
 	buff_copy = get_errorlog_buffer();
 
 	raw_spin_lock_irqsave(&rtas_lock, flags);
+	cookie = lockdep_pin_lock(&rtas_lock);
 
 	rtas_args = args;
 	do_enter_rtas(&rtas_args);
@@ -1843,6 +1872,7 @@ SYSCALL_DEFINE1(rtas, struct rtas_args __user *, uargs)
 	if (be32_to_cpu(args.rets[0]) == -1)
 		errbuf = __fetch_rtas_last_error(buff_copy);
 
+	lockdep_unpin_lock(&rtas_lock, cookie);
 	raw_spin_unlock_irqrestore(&rtas_lock, flags);
 
 	if (buff_copy) {