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([2600:1700:e321:62f0:329c:23ff:fee3:9d7c]) by smtp.gmail.com with ESMTPSA id w125-20020a636283000000b00419b1671c54sm1672819pgb.4.2022.07.14.10.20.29 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 14 Jul 2022 10:20:29 -0700 (PDT) Sender: Guenter Roeck Message-ID: <00a2cb3c-e358-b8f1-5e65-bc1c0694f54d@roeck-us.net> Date: Thu, 14 Jul 2022 10:20:28 -0700 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.9.1 Subject: Re: [PATCH] drm/amd/display: Enable building new display engine with KCOV enabled Content-Language: en-US To: Alex Deucher , Harry Wentland Cc: Arnd Bergmann , Leo Li , LKML , Maling list - DRI developers , amd-gfx list , Alex Deucher References: <20220712224247.1950273-1-linux@roeck-us.net> <98b656f3-e506-90be-ebcc-898813051e74@amd.com> From: Guenter Roeck In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 7/14/22 09:29, Alex Deucher wrote: > Applied. Thanks! > > On Wed, Jul 13, 2022 at 4:03 PM Harry Wentland wrote: >> >> On 2022-07-12 18:42, Guenter Roeck wrote: >>> The new display engine uses floating point math, which is not supported >>> by KCOV. Commit 9d1d02ff3678 ("drm/amd/display: Don't build DCN1 when kcov >>> is enabled") tried to work around the problem by disabling >>> CONFIG_DRM_AMD_DC_DCN if KCOV_INSTRUMENT_ALL and KCOV_ENABLE_COMPARISONS >>> are enabled. The result is that KCOV can not be enabled on systems which >>> require this display engine. A much simpler and less invasive solution is >>> to disable KCOV selectively when compiling the display enagine while "enagine". Outch. Anyway, thanks for applying. Guenter >>> keeping it enabled for the rest of the kernel. >>> >>> Fixes: 9d1d02ff3678 ("drm/amd/display: Don't build DCN1 when kcov is enabled") >>> Cc: Arnd Bergmann >>> Cc: Leo Li >>> Signed-off-by: Guenter Roeck >> >> Reviewed-by: Harry Wentland >> >> Harry >> >>> --- >>> drivers/gpu/drm/amd/display/Kconfig | 2 +- >>> drivers/gpu/drm/amd/display/dc/Makefile | 3 +++ >>> 2 files changed, 4 insertions(+), 1 deletion(-) >>> >>> diff --git a/drivers/gpu/drm/amd/display/Kconfig b/drivers/gpu/drm/amd/display/Kconfig >>> index b4029c0d5d8c..96cbc87f7b6b 100644 >>> --- a/drivers/gpu/drm/amd/display/Kconfig >>> +++ b/drivers/gpu/drm/amd/display/Kconfig >>> @@ -6,7 +6,7 @@ config DRM_AMD_DC >>> bool "AMD DC - Enable new display engine" >>> default y >>> select SND_HDA_COMPONENT if SND_HDA_CORE >>> - select DRM_AMD_DC_DCN if (X86 || PPC64) && !(KCOV_INSTRUMENT_ALL && KCOV_ENABLE_COMPARISONS) >>> + select DRM_AMD_DC_DCN if (X86 || PPC64) >>> 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/dc/Makefile b/drivers/gpu/drm/amd/display/dc/Makefile >>> index b4eca0236435..b801973749d2 100644 >>> --- a/drivers/gpu/drm/amd/display/dc/Makefile >>> +++ b/drivers/gpu/drm/amd/display/dc/Makefile >>> @@ -26,6 +26,9 @@ >>> DC_LIBS = basics bios dml clk_mgr dce gpio irq link virtual >>> >>> ifdef CONFIG_DRM_AMD_DC_DCN >>> + >>> +KCOV_INSTRUMENT := n >>> + >>> DC_LIBS += dcn20 >>> DC_LIBS += dsc >>> DC_LIBS += dcn10 >>