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-rw-r--r--arch/powerpc/platforms/pseries/hvCall.S345
1 files changed, 345 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/pseries/hvCall.S b/arch/powerpc/platforms/pseries/hvCall.S
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index 000000000..8a2b8d642
--- /dev/null
+++ b/arch/powerpc/platforms/pseries/hvCall.S
@@ -0,0 +1,345 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * This file contains the generic code to perform a call to the
+ * pSeries LPAR hypervisor.
+ */
+#include <linux/jump_label.h>
+#include <asm/hvcall.h>
+#include <asm/processor.h>
+#include <asm/ppc_asm.h>
+#include <asm/asm-offsets.h>
+#include <asm/ptrace.h>
+#include <asm/feature-fixups.h>
+
+ .section ".text"
+
+#ifdef CONFIG_TRACEPOINTS
+
+#ifndef CONFIG_JUMP_LABEL
+ .section ".toc","aw"
+
+ .globl hcall_tracepoint_refcount
+hcall_tracepoint_refcount:
+ .8byte 0
+
+ .section ".text"
+#endif
+
+/*
+ * precall must preserve all registers. use unused STK_PARAM()
+ * areas to save snapshots and opcode.
+ */
+#define HCALL_INST_PRECALL(FIRST_REG) \
+ mflr r0; \
+ std r3,STK_PARAM(R3)(r1); \
+ std r4,STK_PARAM(R4)(r1); \
+ std r5,STK_PARAM(R5)(r1); \
+ std r6,STK_PARAM(R6)(r1); \
+ std r7,STK_PARAM(R7)(r1); \
+ std r8,STK_PARAM(R8)(r1); \
+ std r9,STK_PARAM(R9)(r1); \
+ std r10,STK_PARAM(R10)(r1); \
+ std r0,16(r1); \
+ addi r4,r1,STK_PARAM(FIRST_REG); \
+ stdu r1,-STACK_FRAME_OVERHEAD(r1); \
+ bl __trace_hcall_entry; \
+ ld r3,STACK_FRAME_OVERHEAD+STK_PARAM(R3)(r1); \
+ ld r4,STACK_FRAME_OVERHEAD+STK_PARAM(R4)(r1); \
+ ld r5,STACK_FRAME_OVERHEAD+STK_PARAM(R5)(r1); \
+ ld r6,STACK_FRAME_OVERHEAD+STK_PARAM(R6)(r1); \
+ ld r7,STACK_FRAME_OVERHEAD+STK_PARAM(R7)(r1); \
+ ld r8,STACK_FRAME_OVERHEAD+STK_PARAM(R8)(r1); \
+ ld r9,STACK_FRAME_OVERHEAD+STK_PARAM(R9)(r1); \
+ ld r10,STACK_FRAME_OVERHEAD+STK_PARAM(R10)(r1)
+
+/*
+ * postcall is performed immediately before function return which
+ * allows liberal use of volatile registers.
+ */
+#define __HCALL_INST_POSTCALL \
+ ld r0,STACK_FRAME_OVERHEAD+STK_PARAM(R3)(r1); \
+ std r3,STACK_FRAME_OVERHEAD+STK_PARAM(R3)(r1); \
+ mr r4,r3; \
+ mr r3,r0; \
+ bl __trace_hcall_exit; \
+ ld r0,STACK_FRAME_OVERHEAD+16(r1); \
+ addi r1,r1,STACK_FRAME_OVERHEAD; \
+ ld r3,STK_PARAM(R3)(r1); \
+ mtlr r0
+
+#define HCALL_INST_POSTCALL_NORETS \
+ li r5,0; \
+ __HCALL_INST_POSTCALL
+
+#define HCALL_INST_POSTCALL(BUFREG) \
+ mr r5,BUFREG; \
+ __HCALL_INST_POSTCALL
+
+#ifdef CONFIG_JUMP_LABEL
+#define HCALL_BRANCH(LABEL) \
+ ARCH_STATIC_BRANCH(LABEL, hcall_tracepoint_key)
+#else
+
+/*
+ * We branch around this in early init (eg when populating the MMU
+ * hashtable) by using an unconditional cpu feature.
+ */
+#define HCALL_BRANCH(LABEL) \
+BEGIN_FTR_SECTION; \
+ b 1f; \
+END_FTR_SECTION(0, 1); \
+ ld r12,hcall_tracepoint_refcount@toc(r2); \
+ std r12,32(r1); \
+ cmpdi r12,0; \
+ bne- LABEL; \
+1:
+#endif
+
+#else
+#define HCALL_INST_PRECALL(FIRST_ARG)
+#define HCALL_INST_POSTCALL_NORETS
+#define HCALL_INST_POSTCALL(BUFREG)
+#define HCALL_BRANCH(LABEL)
+#endif
+
+_GLOBAL_TOC(plpar_hcall_norets_notrace)
+ HMT_MEDIUM
+
+ mfcr r0
+ stw r0,8(r1)
+ HVSC /* invoke the hypervisor */
+ lwz r0,8(r1)
+ mtcrf 0xff,r0
+ blr /* return r3 = status */
+
+_GLOBAL_TOC(plpar_hcall_norets)
+ HMT_MEDIUM
+
+ mfcr r0
+ stw r0,8(r1)
+ HCALL_BRANCH(plpar_hcall_norets_trace)
+ HVSC /* invoke the hypervisor */
+
+ lwz r0,8(r1)
+ mtcrf 0xff,r0
+ blr /* return r3 = status */
+
+#ifdef CONFIG_TRACEPOINTS
+plpar_hcall_norets_trace:
+ HCALL_INST_PRECALL(R4)
+ HVSC
+ HCALL_INST_POSTCALL_NORETS
+ lwz r0,8(r1)
+ mtcrf 0xff,r0
+ blr
+#endif
+
+_GLOBAL_TOC(plpar_hcall)
+ HMT_MEDIUM
+
+ mfcr r0
+ stw r0,8(r1)
+
+ HCALL_BRANCH(plpar_hcall_trace)
+
+ std r4,STK_PARAM(R4)(r1) /* Save ret buffer */
+
+ mr r4,r5
+ mr r5,r6
+ mr r6,r7
+ mr r7,r8
+ mr r8,r9
+ mr r9,r10
+
+ HVSC /* invoke the hypervisor */
+
+ ld r12,STK_PARAM(R4)(r1)
+ std r4, 0(r12)
+ std r5, 8(r12)
+ std r6, 16(r12)
+ std r7, 24(r12)
+
+ lwz r0,8(r1)
+ mtcrf 0xff,r0
+
+ blr /* return r3 = status */
+
+#ifdef CONFIG_TRACEPOINTS
+plpar_hcall_trace:
+ HCALL_INST_PRECALL(R5)
+
+ std r4,STK_PARAM(R4)(r1)
+ mr r0,r4
+
+ mr r4,r5
+ mr r5,r6
+ mr r6,r7
+ mr r7,r8
+ mr r8,r9
+ mr r9,r10
+
+ HVSC
+
+ ld r12,STK_PARAM(R4)(r1)
+ std r4,0(r12)
+ std r5,8(r12)
+ std r6,16(r12)
+ std r7,24(r12)
+
+ HCALL_INST_POSTCALL(r12)
+
+ lwz r0,8(r1)
+ mtcrf 0xff,r0
+
+ blr
+#endif
+
+/*
+ * plpar_hcall_raw can be called in real mode. kexec/kdump need some
+ * hypervisor calls to be executed in real mode. So plpar_hcall_raw
+ * does not access the per cpu hypervisor call statistics variables,
+ * since these variables may not be present in the RMO region.
+ */
+_GLOBAL(plpar_hcall_raw)
+ HMT_MEDIUM
+
+ mfcr r0
+ stw r0,8(r1)
+
+ std r4,STK_PARAM(R4)(r1) /* Save ret buffer */
+
+ mr r4,r5
+ mr r5,r6
+ mr r6,r7
+ mr r7,r8
+ mr r8,r9
+ mr r9,r10
+
+ HVSC /* invoke the hypervisor */
+
+ ld r12,STK_PARAM(R4)(r1)
+ std r4, 0(r12)
+ std r5, 8(r12)
+ std r6, 16(r12)
+ std r7, 24(r12)
+
+ lwz r0,8(r1)
+ mtcrf 0xff,r0
+
+ blr /* return r3 = status */
+
+_GLOBAL_TOC(plpar_hcall9)
+ HMT_MEDIUM
+
+ mfcr r0
+ stw r0,8(r1)
+
+ HCALL_BRANCH(plpar_hcall9_trace)
+
+ std r4,STK_PARAM(R4)(r1) /* Save ret buffer */
+
+ mr r4,r5
+ mr r5,r6
+ mr r6,r7
+ mr r7,r8
+ mr r8,r9
+ mr r9,r10
+ ld r10,STK_PARAM(R11)(r1) /* put arg7 in R10 */
+ ld r11,STK_PARAM(R12)(r1) /* put arg8 in R11 */
+ ld r12,STK_PARAM(R13)(r1) /* put arg9 in R12 */
+
+ HVSC /* invoke the hypervisor */
+
+ mr r0,r12
+ ld r12,STK_PARAM(R4)(r1)
+ std r4, 0(r12)
+ std r5, 8(r12)
+ std r6, 16(r12)
+ std r7, 24(r12)
+ std r8, 32(r12)
+ std r9, 40(r12)
+ std r10,48(r12)
+ std r11,56(r12)
+ std r0, 64(r12)
+
+ lwz r0,8(r1)
+ mtcrf 0xff,r0
+
+ blr /* return r3 = status */
+
+#ifdef CONFIG_TRACEPOINTS
+plpar_hcall9_trace:
+ HCALL_INST_PRECALL(R5)
+
+ std r4,STK_PARAM(R4)(r1)
+ mr r0,r4
+
+ mr r4,r5
+ mr r5,r6
+ mr r6,r7
+ mr r7,r8
+ mr r8,r9
+ mr r9,r10
+ ld r10,STACK_FRAME_OVERHEAD+STK_PARAM(R11)(r1)
+ ld r11,STACK_FRAME_OVERHEAD+STK_PARAM(R12)(r1)
+ ld r12,STACK_FRAME_OVERHEAD+STK_PARAM(R13)(r1)
+
+ HVSC
+
+ mr r0,r12
+ ld r12,STACK_FRAME_OVERHEAD+STK_PARAM(R4)(r1)
+ std r4,0(r12)
+ std r5,8(r12)
+ std r6,16(r12)
+ std r7,24(r12)
+ std r8,32(r12)
+ std r9,40(r12)
+ std r10,48(r12)
+ std r11,56(r12)
+ std r0,64(r12)
+
+ HCALL_INST_POSTCALL(r12)
+
+ lwz r0,8(r1)
+ mtcrf 0xff,r0
+
+ blr
+#endif
+
+/* See plpar_hcall_raw to see why this is needed */
+_GLOBAL(plpar_hcall9_raw)
+ HMT_MEDIUM
+
+ mfcr r0
+ stw r0,8(r1)
+
+ std r4,STK_PARAM(R4)(r1) /* Save ret buffer */
+
+ mr r4,r5
+ mr r5,r6
+ mr r6,r7
+ mr r7,r8
+ mr r8,r9
+ mr r9,r10
+ ld r10,STK_PARAM(R11)(r1) /* put arg7 in R10 */
+ ld r11,STK_PARAM(R12)(r1) /* put arg8 in R11 */
+ ld r12,STK_PARAM(R13)(r1) /* put arg9 in R12 */
+
+ HVSC /* invoke the hypervisor */
+
+ mr r0,r12
+ ld r12,STK_PARAM(R4)(r1)
+ std r4, 0(r12)
+ std r5, 8(r12)
+ std r6, 16(r12)
+ std r7, 24(r12)
+ std r8, 32(r12)
+ std r9, 40(r12)
+ std r10,48(r12)
+ std r11,56(r12)
+ std r0, 64(r12)
+
+ lwz r0,8(r1)
+ mtcrf 0xff,r0
+
+ blr /* return r3 = status */