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[104.57.184.186]) by smtp.gmail.com with ESMTPSA id o19sm3911701otj.62.2021.09.27.12.51.44 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 27 Sep 2021 12:51:45 -0700 (PDT) Date: Mon, 27 Sep 2021 12:52:20 -0700 From: Bjorn Andersson To: Arnd Bergmann , John Stultz Cc: Arnd Bergmann , Rob Clark , Sean Paul , David Airlie , Daniel Vetter , Joerg Roedel , Will Deacon , Mauro Carvalho Chehab , Ulf Hansson , Alex Elder , "David S. Miller" , Jakub Kicinski , Kalle Valo , Andy Gross , Linus Walleij , Maxime Ripard , Chen-Yu Tsai , Jernej Skrabec , Mark Rutland , Lorenzo Pieralisi , Sudeep Holla , linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, dri-devel@lists.freedesktop.org, freedreno@lists.freedesktop.org, iommu@lists.linux-foundation.org, linux-media@vger.kernel.org, linux-mmc@vger.kernel.org, netdev@vger.kernel.org, ath10k@lists.infradead.org, linux-wireless@vger.kernel.org, linux-gpio@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-sunxi@lists.linux.dev Subject: Re: [PATCH] [RFC] qcom_scm: hide Kconfig symbol Message-ID: References: <20210927152412.2900928-1-arnd@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20210927152412.2900928-1-arnd@kernel.org> Precedence: bulk List-ID: X-Mailing-List: linux-gpio@vger.kernel.org On Mon 27 Sep 08:22 PDT 2021, Arnd Bergmann wrote: > From: Arnd Bergmann > > Now that SCM can be a loadable module, we have to add another > dependency to avoid link failures when ipa or adreno-gpu are > built-in: > > aarch64-linux-ld: drivers/net/ipa/ipa_main.o: in function `ipa_probe': > ipa_main.c:(.text+0xfc4): undefined reference to `qcom_scm_is_available' > > ld.lld: error: undefined symbol: qcom_scm_is_available > >>> referenced by adreno_gpu.c > >>> gpu/drm/msm/adreno/adreno_gpu.o:(adreno_zap_shader_load) in archive drivers/built-in.a > > This can happen when CONFIG_ARCH_QCOM is disabled and we don't select > QCOM_MDT_LOADER, but some other module selects QCOM_SCM. Ideally we'd > use a similar dependency here to what we have for QCOM_RPROC_COMMON, > but that causes dependency loops from other things selecting QCOM_SCM. > > This appears to be an endless problem, so try something different this > time: > > - CONFIG_QCOM_SCM becomes a hidden symbol that nothing 'depends on' > but that is simply selected by all of its users > > - All the stubs in include/linux/qcom_scm.h can go away > > - arm-smccc.h needs to provide a stub for __arm_smccc_smc() to > allow compile-testing QCOM_SCM on all architectures. > > - To avoid a circular dependency chain involving RESET_CONTROLLER > and PINCTRL_SUNXI, change the 'depends on RESET_CONTROLLER' in > the latter one to 'select'. Can you please help me understand why this is part of the same patch? > > The last bit is rather annoying, as drivers should generally never > 'select' another subsystem, and about half the users of the reset > controller interface do this anyway. > > Nevertheless, this version seems to pass all my randconfig tests > and is more robust than any of the prior versions. > > Comments? > I like it! It's less confusing than the current scheme, so should be easier to get right. And I like the fact that we don't need the stubs anymore. @John, could you please have a look at this as well, wrt GKI. Regards, Bjorn > Signed-off-by: Arnd Bergmann > --- > drivers/firmware/Kconfig | 4 +- > drivers/gpu/drm/msm/Kconfig | 4 +- > drivers/iommu/Kconfig | 2 +- > drivers/media/platform/Kconfig | 2 +- > drivers/mmc/host/Kconfig | 2 +- > drivers/net/ipa/Kconfig | 1 + > drivers/net/wireless/ath/ath10k/Kconfig | 2 +- > drivers/pinctrl/qcom/Kconfig | 3 +- > drivers/pinctrl/sunxi/Kconfig | 6 +-- > include/linux/arm-smccc.h | 10 ++++ > include/linux/qcom_scm.h | 71 ------------------------- > 11 files changed, 23 insertions(+), 84 deletions(-) > > diff --git a/drivers/firmware/Kconfig b/drivers/firmware/Kconfig > index 220a58cf0a44..f7dd82ef0b9c 100644 > --- a/drivers/firmware/Kconfig > +++ b/drivers/firmware/Kconfig > @@ -203,9 +203,7 @@ config INTEL_STRATIX10_RSU > Say Y here if you want Intel RSU support. > > config QCOM_SCM > - tristate "Qcom SCM driver" > - depends on ARM || ARM64 > - depends on HAVE_ARM_SMCCC > + tristate > select RESET_CONTROLLER > > config QCOM_SCM_DOWNLOAD_MODE_DEFAULT > diff --git a/drivers/gpu/drm/msm/Kconfig b/drivers/gpu/drm/msm/Kconfig > index e9c6af78b1d7..3ddf739a6f9b 100644 > --- a/drivers/gpu/drm/msm/Kconfig > +++ b/drivers/gpu/drm/msm/Kconfig > @@ -17,7 +17,7 @@ config DRM_MSM > select DRM_SCHED > select SHMEM > select TMPFS > - select QCOM_SCM if ARCH_QCOM > + select QCOM_SCM > select WANT_DEV_COREDUMP > select SND_SOC_HDMI_CODEC if SND_SOC > select SYNC_FILE > @@ -55,7 +55,7 @@ config DRM_MSM_GPU_SUDO > > config DRM_MSM_HDMI_HDCP > bool "Enable HDMI HDCP support in MSM DRM driver" > - depends on DRM_MSM && QCOM_SCM > + depends on DRM_MSM > default y > help > Choose this option to enable HDCP state machine > diff --git a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig > index 124c41adeca1..989c83acbfee 100644 > --- a/drivers/iommu/Kconfig > +++ b/drivers/iommu/Kconfig > @@ -308,7 +308,7 @@ config APPLE_DART > config ARM_SMMU > tristate "ARM Ltd. System MMU (SMMU) Support" > depends on ARM64 || ARM || (COMPILE_TEST && !GENERIC_ATOMIC64) > - depends on QCOM_SCM || !QCOM_SCM #if QCOM_SCM=m this can't be =y > + select QCOM_SCM > select IOMMU_API > select IOMMU_IO_PGTABLE_LPAE > select ARM_DMA_USE_IOMMU if ARM > diff --git a/drivers/media/platform/Kconfig b/drivers/media/platform/Kconfig > index 157c924686e4..80321e03809a 100644 > --- a/drivers/media/platform/Kconfig > +++ b/drivers/media/platform/Kconfig > @@ -565,7 +565,7 @@ config VIDEO_QCOM_VENUS > depends on VIDEO_DEV && VIDEO_V4L2 && QCOM_SMEM > depends on (ARCH_QCOM && IOMMU_DMA) || COMPILE_TEST > select QCOM_MDT_LOADER if ARCH_QCOM > - select QCOM_SCM if ARCH_QCOM > + select QCOM_SCM > select VIDEOBUF2_DMA_CONTIG > select V4L2_MEM2MEM_DEV > help > diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig > index 71313961cc54..95b3511b0560 100644 > --- a/drivers/mmc/host/Kconfig > +++ b/drivers/mmc/host/Kconfig > @@ -547,7 +547,7 @@ config MMC_SDHCI_MSM > depends on MMC_SDHCI_PLTFM > select MMC_SDHCI_IO_ACCESSORS > select MMC_CQHCI > - select QCOM_SCM if MMC_CRYPTO && ARCH_QCOM > + select QCOM_SCM if MMC_CRYPTO > help > This selects the Secure Digital Host Controller Interface (SDHCI) > support present in Qualcomm SOCs. The controller supports > diff --git a/drivers/net/ipa/Kconfig b/drivers/net/ipa/Kconfig > index 8f99cfa14680..d037682fb7ad 100644 > --- a/drivers/net/ipa/Kconfig > +++ b/drivers/net/ipa/Kconfig > @@ -4,6 +4,7 @@ config QCOM_IPA > depends on ARCH_QCOM || COMPILE_TEST > depends on QCOM_RPROC_COMMON || (QCOM_RPROC_COMMON=n && COMPILE_TEST) > select QCOM_MDT_LOADER if ARCH_QCOM > + select QCOM_SCM > select QCOM_QMI_HELPERS > help > Choose Y or M here to include support for the Qualcomm > diff --git a/drivers/net/wireless/ath/ath10k/Kconfig b/drivers/net/wireless/ath/ath10k/Kconfig > index 741289e385d5..ca007b800f75 100644 > --- a/drivers/net/wireless/ath/ath10k/Kconfig > +++ b/drivers/net/wireless/ath/ath10k/Kconfig > @@ -44,7 +44,7 @@ config ATH10K_SNOC > tristate "Qualcomm ath10k SNOC support" > depends on ATH10K > depends on ARCH_QCOM || COMPILE_TEST > - depends on QCOM_SCM || !QCOM_SCM #if QCOM_SCM=m this can't be =y > + select QCOM_SCM > select QCOM_QMI_HELPERS > help > This module adds support for integrated WCN3990 chip connected > diff --git a/drivers/pinctrl/qcom/Kconfig b/drivers/pinctrl/qcom/Kconfig > index 32ea2a8ec02b..5ff4207df66e 100644 > --- a/drivers/pinctrl/qcom/Kconfig > +++ b/drivers/pinctrl/qcom/Kconfig > @@ -3,7 +3,8 @@ if (ARCH_QCOM || COMPILE_TEST) > > config PINCTRL_MSM > tristate "Qualcomm core pin controller driver" > - depends on GPIOLIB && (QCOM_SCM || !QCOM_SCM) #if QCOM_SCM=m this can't be =y > + depends on GPIOLIB > + select QCOM_SCM > select PINMUX > select PINCONF > select GENERIC_PINCONF > diff --git a/drivers/pinctrl/sunxi/Kconfig b/drivers/pinctrl/sunxi/Kconfig > index 33751a6a0757..3447d2744ca3 100644 > --- a/drivers/pinctrl/sunxi/Kconfig > +++ b/drivers/pinctrl/sunxi/Kconfig > @@ -29,7 +29,7 @@ config PINCTRL_SUN6I_A31 > config PINCTRL_SUN6I_A31_R > bool "Support for the Allwinner A31 R-PIO" > default MACH_SUN6I > - depends on RESET_CONTROLLER > + select RESET_CONTROLLER > select PINCTRL_SUNXI > > config PINCTRL_SUN8I_A23 > @@ -55,7 +55,7 @@ config PINCTRL_SUN8I_A83T_R > config PINCTRL_SUN8I_A23_R > bool "Support for the Allwinner A23 and A33 R-PIO" > default MACH_SUN8I > - depends on RESET_CONTROLLER > + select RESET_CONTROLLER > select PINCTRL_SUNXI > > config PINCTRL_SUN8I_H3 > @@ -81,7 +81,7 @@ config PINCTRL_SUN9I_A80 > config PINCTRL_SUN9I_A80_R > bool "Support for the Allwinner A80 R-PIO" > default MACH_SUN9I > - depends on RESET_CONTROLLER > + select RESET_CONTROLLER > select PINCTRL_SUNXI > > config PINCTRL_SUN50I_A64 > diff --git a/include/linux/arm-smccc.h b/include/linux/arm-smccc.h > index 7d1cabe15262..63ccb5252190 100644 > --- a/include/linux/arm-smccc.h > +++ b/include/linux/arm-smccc.h > @@ -321,10 +321,20 @@ asmlinkage unsigned long __arm_smccc_sve_check(unsigned long x0); > * from register 0 to 3 on return from the SMC instruction. An optional > * quirk structure provides vendor specific behavior. > */ > +#ifdef CONFIG_HAVE_ARM_SMCCC > asmlinkage void __arm_smccc_smc(unsigned long a0, unsigned long a1, > unsigned long a2, unsigned long a3, unsigned long a4, > unsigned long a5, unsigned long a6, unsigned long a7, > struct arm_smccc_res *res, struct arm_smccc_quirk *quirk); > +#else > +static inline void __arm_smccc_smc(unsigned long a0, unsigned long a1, > + unsigned long a2, unsigned long a3, unsigned long a4, > + unsigned long a5, unsigned long a6, unsigned long a7, > + struct arm_smccc_res *res, struct arm_smccc_quirk *quirk) > +{ > + *res = (struct arm_smccc_res){}; > +} > +#endif > > /** > * __arm_smccc_hvc() - make HVC calls > diff --git a/include/linux/qcom_scm.h b/include/linux/qcom_scm.h > index c0475d1c9885..81cad9e1e412 100644 > --- a/include/linux/qcom_scm.h > +++ b/include/linux/qcom_scm.h > @@ -61,7 +61,6 @@ enum qcom_scm_ice_cipher { > #define QCOM_SCM_PERM_RW (QCOM_SCM_PERM_READ | QCOM_SCM_PERM_WRITE) > #define QCOM_SCM_PERM_RWX (QCOM_SCM_PERM_RW | QCOM_SCM_PERM_EXEC) > > -#if IS_ENABLED(CONFIG_QCOM_SCM) > extern bool qcom_scm_is_available(void); > > extern int qcom_scm_set_cold_boot_addr(void *entry, const cpumask_t *cpus); > @@ -115,74 +114,4 @@ extern int qcom_scm_lmh_dcvsh(u32 payload_fn, u32 payload_reg, u32 payload_val, > extern int qcom_scm_lmh_profile_change(u32 profile_id); > extern bool qcom_scm_lmh_dcvsh_available(void); > > -#else > - > -#include > - > -static inline bool qcom_scm_is_available(void) { return false; } > - > -static inline int qcom_scm_set_cold_boot_addr(void *entry, > - const cpumask_t *cpus) { return -ENODEV; } > -static inline int qcom_scm_set_warm_boot_addr(void *entry, > - const cpumask_t *cpus) { return -ENODEV; } > -static inline void qcom_scm_cpu_power_down(u32 flags) {} > -static inline u32 qcom_scm_set_remote_state(u32 state,u32 id) > - { return -ENODEV; } > - > -static inline int qcom_scm_pas_init_image(u32 peripheral, const void *metadata, > - size_t size) { return -ENODEV; } > -static inline int qcom_scm_pas_mem_setup(u32 peripheral, phys_addr_t addr, > - phys_addr_t size) { return -ENODEV; } > -static inline int qcom_scm_pas_auth_and_reset(u32 peripheral) > - { return -ENODEV; } > -static inline int qcom_scm_pas_shutdown(u32 peripheral) { return -ENODEV; } > -static inline bool qcom_scm_pas_supported(u32 peripheral) { return false; } > - > -static inline int qcom_scm_io_readl(phys_addr_t addr, unsigned int *val) > - { return -ENODEV; } > -static inline int qcom_scm_io_writel(phys_addr_t addr, unsigned int val) > - { return -ENODEV; } > - > -static inline bool qcom_scm_restore_sec_cfg_available(void) { return false; } > -static inline int qcom_scm_restore_sec_cfg(u32 device_id, u32 spare) > - { return -ENODEV; } > -static inline int qcom_scm_iommu_secure_ptbl_size(u32 spare, size_t *size) > - { return -ENODEV; } > -static inline int qcom_scm_iommu_secure_ptbl_init(u64 addr, u32 size, u32 spare) > - { return -ENODEV; } > -extern inline int qcom_scm_mem_protect_video_var(u32 cp_start, u32 cp_size, > - u32 cp_nonpixel_start, > - u32 cp_nonpixel_size) > - { return -ENODEV; } > -static inline int qcom_scm_assign_mem(phys_addr_t mem_addr, size_t mem_sz, > - unsigned int *src, const struct qcom_scm_vmperm *newvm, > - unsigned int dest_cnt) { return -ENODEV; } > - > -static inline bool qcom_scm_ocmem_lock_available(void) { return false; } > -static inline int qcom_scm_ocmem_lock(enum qcom_scm_ocmem_client id, u32 offset, > - u32 size, u32 mode) { return -ENODEV; } > -static inline int qcom_scm_ocmem_unlock(enum qcom_scm_ocmem_client id, > - u32 offset, u32 size) { return -ENODEV; } > - > -static inline bool qcom_scm_ice_available(void) { return false; } > -static inline int qcom_scm_ice_invalidate_key(u32 index) { return -ENODEV; } > -static inline int qcom_scm_ice_set_key(u32 index, const u8 *key, u32 key_size, > - enum qcom_scm_ice_cipher cipher, > - u32 data_unit_size) { return -ENODEV; } > - > -static inline bool qcom_scm_hdcp_available(void) { return false; } > -static inline int qcom_scm_hdcp_req(struct qcom_scm_hdcp_req *req, u32 req_cnt, > - u32 *resp) { return -ENODEV; } > - > -static inline int qcom_scm_qsmmu500_wait_safe_toggle(bool en) > - { return -ENODEV; } > - > -static inline int qcom_scm_lmh_dcvsh(u32 payload_fn, u32 payload_reg, u32 payload_val, > - u64 limit_node, u32 node_id, u64 version) > - { return -ENODEV; } > - > -static inline int qcom_scm_lmh_profile_change(u32 profile_id) { return -ENODEV; } > - > -static inline bool qcom_scm_lmh_dcvsh_available(void) { return -ENODEV; } > -#endif > #endif > -- > 2.29.2 >