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linuxkpi: add kernel_fpu_begin/kernel_fpu_end

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With newer AMD GPUs (>=Navi,Renoir) there is FPU context usage in the
amdgpu driver.
The `kernel_fpu_begin/end` implementations in drm did not even allow nested
begin-end blocks.

Submitted by: Greg V
Reviewed By: manu, hselasky
Differential Revision: https://reviews.freebsd.org/D28061
This commit is contained in:
Emmanuel Vadot 2021-01-12 12:02:38 +01:00
parent 2c95fb753f
commit 11d62b6f31
6 changed files with 128 additions and 1 deletions
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68
sys/compat/linuxkpi/common/include/asm/fpu/api.h Normal file
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@ -0,0 +1,68 @@
/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2020 Greg V <greg@unrelenting.technology>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef _FPU_API_H_
#define _FPU_API_H_
#if defined(__aarch64__) || defined(__amd64__) || defined(__i386__)
#include <machine/fpu.h>
extern struct fpu_kern_ctx *__lkpi_fpu_ctx;
extern unsigned int __lkpi_fpu_ctx_level;
static inline void
kernel_fpu_begin()
{
if (__lkpi_fpu_ctx_level++ == 0) {
fpu_kern_enter(curthread, __lkpi_fpu_ctx, FPU_KERN_NORMAL);
}
}
static inline void
kernel_fpu_end()
{
if (--__lkpi_fpu_ctx_level == 0) {
fpu_kern_leave(curthread, __lkpi_fpu_ctx);
}
}
#else
static inline void
kernel_fpu_begin()
{
}
static inline void
kernel_fpu_end()
{
}
#endif
#endif /* _FPU_API_H_ */

50
sys/compat/linuxkpi/common/src/linux_fpu.c Normal file
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@ -0,0 +1,50 @@
/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2020 Greg V <greg@unrelenting.technology>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/types.h>
#include <sys/param.h>
#include <sys/proc.h>
#include <sys/kernel.h>
#include <machine/fpu.h>
struct fpu_kern_ctx *__lkpi_fpu_ctx;
unsigned int __lkpi_fpu_ctx_level = 0;
static void
linux_fpu_init(void *arg __unused)
{
__lkpi_fpu_ctx = fpu_kern_alloc_ctx(0);
}
SYSINIT(linux_fpu, SI_SUB_EVENTHANDLER, SI_ORDER_SECOND, linux_fpu_init, NULL);
static void
linux_fpu_uninit(void *arg __unused)
{
fpu_kern_free_ctx(__lkpi_fpu_ctx);
}
SYSUNINIT(linux_fpu, SI_SUB_EVENTHANDLER, SI_ORDER_SECOND, linux_fpu_uninit, NULL);

3
sys/conf/files.amd64
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@ -462,6 +462,9 @@ x86/xen/pv.c optional xenhvm
x86/xen/pvcpu_enum.c optional xenhvm
x86/xen/xen_pci_bus.c optional xenhvm
compat/linuxkpi/common/src/linux_fpu.c optional compat_linuxkpi \
compile-with "${LINUXKPI_C}"
contrib/openzfs/module/zcommon/zfs_fletcher_avx512.c optional zfs compile-with "${ZFS_C}"
contrib/openzfs/module/zcommon/zfs_fletcher_intel.c optional zfs compile-with "${ZFS_C}"
contrib/openzfs/module/zcommon/zfs_fletcher_sse.c optional zfs compile-with "${ZFS_C}"

3
sys/conf/files.arm64
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@ -494,3 +494,6 @@ tegra210_xusb.fw optional tegra210_xusb_fw \
compile-with "${NORMAL_FW}" \
no-obj no-implicit-rule \
clean "tegra210_xusb.fw"
compat/linuxkpi/common/src/linux_fpu.c optional compat_linuxkpi \
compile-with "${LINUXKPI_C}"

3
sys/conf/files.i386
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@ -241,3 +241,6 @@ x86/x86/local_apic.c optional apic
x86/x86/mptable.c optional apic
x86/x86/mptable_pci.c optional apic pci
x86/x86/msi.c optional apic pci
compat/linuxkpi/common/src/linux_fpu.c optional compat_linuxkpi \
compile-with "${LINUXKPI_C}"

2
sys/modules/linuxkpi/Makefile
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@ -26,7 +26,7 @@ SRCS= linux_compat.c \
.if ${MACHINE_CPUARCH} == "aarch64" || ${MACHINE_CPUARCH} == "amd64" || \
${MACHINE_CPUARCH} == "i386"
SRCS+= opt_acpi.h acpi_if.h linux_acpi.c
SRCS+= opt_acpi.h acpi_if.h linux_acpi.c linux_fpu.c
.endif
SRCS+= ${LINUXKPI_GENSRCS}