powerpc/pseries: PAPR system parameter API

Introduce a set of APIs for retrieving and updating PAPR system
parameters. This encapsulates the toil of temporary RTAS work area
management, RTAS function call retries, and translation of RTAS call
statuses to conventional error values.

There are several places in the kernel that already retrieve system
parameters by calling the RTAS ibm,get-system-parameter function
directly. These will be converted to papr_sysparm_get() in changes to
follow.

As for updating system parameters, current practice is to use
sys_rtas() from user space; there are no in-kernel users of the RTAS
ibm,set-system-parameter function. However this will become deprecated
in time because it is not compatible with lockdown.

The papr_sysparm_* APIs will form the common basis for in-kernel
and user space access to system parameters. The code to expose the
set/get capabilities to user space will follow.

Signed-off-by: Nathan Lynch <nathanl@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20230125-b4-powerpc-rtas-queue-v3-14-26929c8cce78@linux.ibm.com

1 files changed, 38 insertions, 0 deletions

diff --git a/arch/powerpc/include/asm/papr-sysparm.h b/arch/powerpc/include/asm/papr-sysparm.h
new file mode 100644
index 000000000000..f5fdbd8ae9db
--- /dev/null
+++ b/arch/powerpc/include/asm/papr-sysparm.h
@@ -0,0 +1,38 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+#ifndef _ASM_POWERPC_PAPR_SYSPARM_H
+#define _ASM_POWERPC_PAPR_SYSPARM_H
+
+typedef struct {
+	const u32 token;
+} papr_sysparm_t;
+
+#define mk_papr_sysparm(x_) ((papr_sysparm_t){ .token = x_, })
+
+/*
+ * Derived from the "Defined Parameters" table in PAPR 7.3.16 System
+ * Parameters Option. Where the spec says "characteristics", we use
+ * "attrs" in the symbolic names to keep them from getting too
+ * unwieldy.
+ */
+#define PAPR_SYSPARM_SHARED_PROC_LPAR_ATTRS        mk_papr_sysparm(20)
+#define PAPR_SYSPARM_PROC_MODULE_INFO              mk_papr_sysparm(43)
+#define PAPR_SYSPARM_COOP_MEM_OVERCOMMIT_ATTRS     mk_papr_sysparm(44)
+#define PAPR_SYSPARM_TLB_BLOCK_INVALIDATE_ATTRS    mk_papr_sysparm(50)
+#define PAPR_SYSPARM_LPAR_NAME                     mk_papr_sysparm(55)
+
+enum {
+	PAPR_SYSPARM_MAX_INPUT  = 1024,
+	PAPR_SYSPARM_MAX_OUTPUT = 4000,
+};
+
+struct papr_sysparm_buf {
+	__be16 len;
+	char val[PAPR_SYSPARM_MAX_OUTPUT];
+};
+
+struct papr_sysparm_buf *papr_sysparm_buf_alloc(void);
+void papr_sysparm_buf_free(struct papr_sysparm_buf *buf);
+int papr_sysparm_set(papr_sysparm_t param, const struct papr_sysparm_buf *buf);
+int papr_sysparm_get(papr_sysparm_t param, struct papr_sysparm_buf *buf);
+
+#endif /* _ASM_POWERPC_PAPR_SYSPARM_H */