Hi,
On 5/5/23 21:39, Hamza Mahfooz wrote:
Hey Huacai,
On 5/5/23 07:32, Huacai Chen wrote:
Now LoongArch provides kernel_fpu_begin() and kernel_fpu_end() in commit
2b3bd32ea3a22ea2d ("LoongArch: Provide kernel fpu functions"), so we can
enable DC_FP for DCN devices.
Have you had the chance to test how well this is working on actual
hardware, or was it only compile tested? If it was only compile tested,
it would be great if you could run some tests. Please see the following
for more details:
https://lore.kernel.org/amd-gfx/8eb69dfb-ae35-dbf2-3f82-e8cc00e5389a@xxxxxxx/
Thanks for the helpful link!
I did test an earlier version of this patch along with the
arch/loongarch kernel FPU bits before that patch got upstreamed, with a
RX 6400 (BEIGE_GOBY) on a Loongson 3A5000 + LS7A1000 system (by far the
most popular combination for LoongArch desktops). Things like Plasma
Wayland session or glmark2 work just fine, although I didn't go for the
more complete testing as detailed in the mail you linked to. I'll try
going through that procedure in the next 1~2 days when I have time & get
physical access to that box.
On a side note, I had to modprobe amdgpu with runpm=0, otherwise my
dmesg gets flooded with PSP getting resumed every 8~10 seconds or so. I
currently have none of the connectors plugged in. I didn't notice any
similar reports on the Internet so I don't know if it's due to platform
quirks or not.
Signed-off-by: WANG Xuerui <kernel@xxxxxxxxxx>
Signed-off-by: Huacai Chen <chenhuacai@xxxxxxxxxxx>
---
V2: Update commit message to add the commit which provides kernel fpu
functions.
drivers/gpu/drm/amd/display/Kconfig | 2 +-
drivers/gpu/drm/amd/display/amdgpu_dm/dc_fpu.c | 6 ++++--
drivers/gpu/drm/amd/display/dc/dml/Makefile | 5 +++++
3 files changed, 10 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/amd/display/Kconfig
b/drivers/gpu/drm/amd/display/Kconfig
index 2d8e55e29637..49df073962d5 100644
--- a/drivers/gpu/drm/amd/display/Kconfig
+++ b/drivers/gpu/drm/amd/display/Kconfig
@@ -8,7 +8,7 @@ config DRM_AMD_DC
depends on BROKEN || !CC_IS_CLANG || X86_64 || SPARC64 || ARM64
select SND_HDA_COMPONENT if SND_HDA_CORE
# !CC_IS_CLANG:
https://github.com/ClangBuiltLinux/linux/issues/1752
- select DRM_AMD_DC_FP if (X86 || (PPC64 && ALTIVEC) || (ARM64 &&
KERNEL_MODE_NEON && !CC_IS_CLANG))
+ select DRM_AMD_DC_FP if (X86 || LOONGARCH || (PPC64 && ALTIVEC)
|| (ARM64 && KERNEL_MODE_NEON && !CC_IS_CLANG))
help
Choose this option if you want to use the new display engine
support for AMDGPU. This adds required support for Vega and
diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/dc_fpu.c
b/drivers/gpu/drm/amd/display/amdgpu_dm/dc_fpu.c
index 1743ca0a3641..86f4c0e04654 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/dc_fpu.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/dc_fpu.c
@@ -33,6 +33,8 @@
#include <asm/cputable.h>
#elif defined(CONFIG_ARM64)
#include <asm/neon.h>
+#elif defined(CONFIG_LOONGARCH)
+#include <asm/fpu.h>
#endif
/**
@@ -88,7 +90,7 @@ void dc_fpu_begin(const char *function_name, const
int line)
*pcpu += 1;
if (*pcpu == 1) {
-#if defined(CONFIG_X86)
+#if defined(CONFIG_X86) || defined(CONFIG_LOONGARCH)
kernel_fpu_begin();
This is going to conflict with commit b1bcdd409d2d ("drm/amd/display:
Disable migration to ensure consistency of per-CPU variable"), which is
present in next-20230505. Resolution is trivial though.
#elif defined(CONFIG_PPC64)
if (cpu_has_feature(CPU_FTR_VSX_COMP)) {
@@ -127,7 +129,7 @@ void dc_fpu_end(const char *function_name, const
int line)
pcpu = get_cpu_ptr(&fpu_recursion_depth);
*pcpu -= 1;
if (*pcpu <= 0) {
-#if defined(CONFIG_X86)
+#if defined(CONFIG_X86) || defined(CONFIG_LOONGARCH)
kernel_fpu_end();
#elif defined(CONFIG_PPC64)
if (cpu_has_feature(CPU_FTR_VSX_COMP)) {
diff --git a/drivers/gpu/drm/amd/display/dc/dml/Makefile
b/drivers/gpu/drm/amd/display/dc/dml/Makefile
index 01db035589c5..542962a93e8f 100644
--- a/drivers/gpu/drm/amd/display/dc/dml/Makefile
+++ b/drivers/gpu/drm/amd/display/dc/dml/Makefile
@@ -38,6 +38,11 @@ ifdef CONFIG_ARM64
dml_rcflags := -mgeneral-regs-only
endif
+ifdef CONFIG_LOONGARCH
+dml_ccflags := -mfpu=64
+dml_rcflags := -msoft-float
+endif
+
ifdef CONFIG_CC_IS_GCC
ifneq ($(call gcc-min-version, 70100),y)
IS_OLD_GCC = 1
--
WANG "xen0n" Xuerui
Linux/LoongArch mailing list: https://lore.kernel.org/loongarch/
