drm/vmwgfx: Port vmwgfx to arm64

This change fixes all of the arm64 issues we've had in the driver.
ARM support is provided in svga version 3, for which support we've added
in previous changes. svga version 3 currently lacks many of the
advanced features (in particular 3D support is lacking) but
that will change in time.

Signed-off-by: Zack Rusin <zackr@vmware.com>
Reviewed-by: Roland Scheidegger <sroland@vmware.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210505035740.286923-7-zackr@vmware.com

1 files changed, 219 insertions, 0 deletions

diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_msg_x86.h b/drivers/gpu/drm/vmwgfx/vmwgfx_msg_x86.h
new file mode 100644
index 000000000000..0b74ca2dfb7b
--- /dev/null
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_msg_x86.h
@@ -0,0 +1,219 @@
+/* SPDX-License-Identifier: GPL-2.0+ OR MIT */
+/**************************************************************************
+ *
+ * Copyright 2016-2021 VMware, Inc., Palo Alto, CA., USA
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+ * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+ * USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ **************************************************************************
+ *
+ * Based on code from vmware.c and vmmouse.c.
+ * Author:
+ *   Sinclair Yeh <syeh@vmware.com>
+ */
+#ifndef _VMWGFX_MSG_X86_H
+#define _VMWGFX_MSG_X86_H
+
+
+#if defined(__i386__) || defined(__x86_64__)
+
+#include <asm/vmware.h>
+
+/**
+ * Hypervisor-specific bi-directional communication channel.  Should never
+ * execute on bare metal hardware.  The caller must make sure to check for
+ * supported hypervisor before using these macros.
+ *
+ * The last two parameters are both input and output and must be initialized.
+ *
+ * @cmd: [IN] Message Cmd
+ * @in_ebx: [IN] Message Len, through EBX
+ * @in_si: [IN] Input argument through SI, set to 0 if not used
+ * @in_di: [IN] Input argument through DI, set ot 0 if not used
+ * @flags: [IN] hypercall flags + [channel id]
+ * @magic: [IN] hypervisor magic value
+ * @eax: [OUT] value of EAX register
+ * @ebx: [OUT] e.g. status from an HB message status command
+ * @ecx: [OUT] e.g. status from a non-HB message status command
+ * @edx: [OUT] e.g. channel id
+ * @si:  [OUT]
+ * @di:  [OUT]
+ */
+#define VMW_PORT(cmd, in_ebx, in_si, in_di,	\
+                 flags, magic,		\
+                 eax, ebx, ecx, edx, si, di)	\
+({						\
+        asm volatile (VMWARE_HYPERCALL :	\
+                "=a"(eax),			\
+                "=b"(ebx),			\
+                "=c"(ecx),			\
+                "=d"(edx),			\
+                "=S"(si),			\
+                "=D"(di) :			\
+                "a"(magic),			\
+                "b"(in_ebx),			\
+                "c"(cmd),			\
+                "d"(flags),			\
+                "S"(in_si),			\
+                "D"(in_di) :			\
+                "memory");			\
+})
+
+
+/**
+ * Hypervisor-specific bi-directional communication channel.  Should never
+ * execute on bare metal hardware.  The caller must make sure to check for
+ * supported hypervisor before using these macros.
+ *
+ * The last 3 parameters are both input and output and must be initialized.
+ *
+ * @cmd: [IN] Message Cmd
+ * @in_ecx: [IN] Message Len, through ECX
+ * @in_si: [IN] Input argument through SI, set to 0 if not used
+ * @in_di: [IN] Input argument through DI, set to 0 if not used
+ * @flags: [IN] hypercall flags + [channel id]
+ * @magic: [IN] hypervisor magic value
+ * @bp:  [IN]
+ * @eax: [OUT] value of EAX register
+ * @ebx: [OUT] e.g. status from an HB message status command
+ * @ecx: [OUT] e.g. status from a non-HB message status command
+ * @edx: [OUT] e.g. channel id
+ * @si:  [OUT]
+ * @di:  [OUT]
+ */
+#ifdef __x86_64__
+
+#define VMW_PORT_HB_OUT(cmd, in_ecx, in_si, in_di,	\
+                        flags, magic, bp,		\
+                        eax, ebx, ecx, edx, si, di)	\
+({							\
+        asm volatile ("push %%rbp;"			\
+                "mov %12, %%rbp;"			\
+                VMWARE_HYPERCALL_HB_OUT			\
+                "pop %%rbp;" :				\
+                "=a"(eax),				\
+                "=b"(ebx),				\
+                "=c"(ecx),				\
+                "=d"(edx),				\
+                "=S"(si),				\
+                "=D"(di) :				\
+                "a"(magic),				\
+                "b"(cmd),				\
+                "c"(in_ecx),				\
+                "d"(flags),				\
+                "S"(in_si),				\
+                "D"(in_di),				\
+                "r"(bp) :				\
+                "memory", "cc");			\
+})
+
+
+#define VMW_PORT_HB_IN(cmd, in_ecx, in_si, in_di,	\
+                       flags, magic, bp,		\
+                       eax, ebx, ecx, edx, si, di)	\
+({							\
+        asm volatile ("push %%rbp;"			\
+                "mov %12, %%rbp;"			\
+                VMWARE_HYPERCALL_HB_IN			\
+                "pop %%rbp" :				\
+                "=a"(eax),				\
+                "=b"(ebx),				\
+                "=c"(ecx),				\
+                "=d"(edx),				\
+                "=S"(si),				\
+                "=D"(di) :				\
+                "a"(magic),				\
+                "b"(cmd),				\
+                "c"(in_ecx),				\
+                "d"(flags),				\
+                "S"(in_si),				\
+                "D"(in_di),				\
+                "r"(bp) :				\
+                "memory", "cc");			\
+})
+
+#elif defined(__i386__)
+
+/*
+ * In the 32-bit version of this macro, we store bp in a memory location
+ * because we've ran out of registers.
+ * Now we can't reference that memory location while we've modified
+ * %esp or %ebp, so we first push it on the stack, just before we push
+ * %ebp, and then when we need it we read it from the stack where we
+ * just pushed it.
+ */
+#define VMW_PORT_HB_OUT(cmd, in_ecx, in_si, in_di,	\
+                        flags, magic, bp,		\
+                        eax, ebx, ecx, edx, si, di)	\
+({							\
+        asm volatile ("push %12;"			\
+                "push %%ebp;"				\
+                "mov 0x04(%%esp), %%ebp;"		\
+                VMWARE_HYPERCALL_HB_OUT			\
+                "pop %%ebp;"				\
+                "add $0x04, %%esp;" :			\
+                "=a"(eax),				\
+                "=b"(ebx),				\
+                "=c"(ecx),				\
+                "=d"(edx),				\
+                "=S"(si),				\
+                "=D"(di) :				\
+                "a"(magic),				\
+                "b"(cmd),				\
+                "c"(in_ecx),				\
+                "d"(flags),				\
+                "S"(in_si),				\
+                "D"(in_di),				\
+                "m"(bp) :				\
+                "memory", "cc");			\
+})
+
+
+#define VMW_PORT_HB_IN(cmd, in_ecx, in_si, in_di,	\
+                       flags, magic, bp,		\
+                       eax, ebx, ecx, edx, si, di)	\
+({							\
+        asm volatile ("push %12;"			\
+                "push %%ebp;"				\
+                "mov 0x04(%%esp), %%ebp;"		\
+                VMWARE_HYPERCALL_HB_IN			\
+                "pop %%ebp;"				\
+                "add $0x04, %%esp;" :			\
+                "=a"(eax),				\
+                "=b"(ebx),				\
+                "=c"(ecx),				\
+                "=d"(edx),				\
+                "=S"(si),				\
+                "=D"(di) :				\
+                "a"(magic),				\
+                "b"(cmd),				\
+                "c"(in_ecx),				\
+                "d"(flags),				\
+                "S"(in_si),				\
+                "D"(in_di),				\
+                "m"(bp) :				\
+                "memory", "cc");			\
+})
+#endif /* defined(__i386__) */
+
+#endif /* defined(__i386__) || defined(__x86_64__) */
+
+#endif /* _VMWGFX_MSG_X86_H */