* Re: [PATCH v2 2/2] qcom_scm: hide Kconfig symbol
2021-10-07 15:10 ` [PATCH v2 2/2] qcom_scm: hide Kconfig symbol Arnd Bergmann
@ 2021-10-11 11:37 ` Hans Verkuil
2021-10-12 3:11 ` John Stultz
1 sibling, 0 replies; 4+ messages in thread
From: Hans Verkuil @ 2021-10-11 11:37 UTC (permalink / raw)
To: Arnd Bergmann, linux-kernel
Cc: linux-arm-kernel, linux-ia64, linux-mips, linux-parisc,
linux-riscv, linux-arm-msm, dri-devel, freedreno, iommu,
linux-media, linux-mmc, netdev, ath10k, linux-wireless,
linux-gpio, Arnd Bergmann, Kalle Valo, Alex Elder
On 07/10/2021 17:10, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@arndb.de>
>
> 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, drop the 'select RESET_CONTROLLER' statement.
> According to my testing this still builds fine, and the QCOM
> platform selects this symbol already.
Acked-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Thanks,
Hans
>
> Acked-by: Kalle Valo <kvalo@codeaurora.org>
> Acked-by: Alex Elder <elder@linaro.org>
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> ---
> Changes in v2:
> - fix the iommu dependencies
>
> I've queued this version as a bugfix along with patch 1/2
> in my asm-generic tree.
>
> drivers/firmware/Kconfig | 5 +-
> drivers/gpu/drm/msm/Kconfig | 4 +-
> drivers/iommu/Kconfig | 3 +-
> drivers/iommu/arm/arm-smmu/Makefile | 3 +-
> drivers/iommu/arm/arm-smmu/arm-smmu-impl.c | 3 +-
> 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 +-
> include/linux/arm-smccc.h | 10 +++
> include/linux/qcom_scm.h | 71 ----------------------
> 12 files changed, 24 insertions(+), 85 deletions(-)
>
> diff --git a/drivers/firmware/Kconfig b/drivers/firmware/Kconfig
> index 220a58cf0a44..cda7d7162cbb 100644
> --- a/drivers/firmware/Kconfig
> +++ b/drivers/firmware/Kconfig
> @@ -203,10 +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
> - select RESET_CONTROLLER
> + tristate
>
> config QCOM_SCM_DOWNLOAD_MODE_DEFAULT
> bool "Qualcomm download mode enabled by 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..c5c71b7ab7e8 100644
> --- a/drivers/iommu/Kconfig
> +++ b/drivers/iommu/Kconfig
> @@ -308,7 +308,6 @@ 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 IOMMU_API
> select IOMMU_IO_PGTABLE_LPAE
> select ARM_DMA_USE_IOMMU if ARM
> @@ -438,7 +437,7 @@ config QCOM_IOMMU
> # Note: iommu drivers cannot (yet?) be built as modules
> bool "Qualcomm IOMMU Support"
> depends on ARCH_QCOM || (COMPILE_TEST && !GENERIC_ATOMIC64)
> - depends on QCOM_SCM=y
> + select QCOM_SCM
> select IOMMU_API
> select IOMMU_IO_PGTABLE_LPAE
> select ARM_DMA_USE_IOMMU
> diff --git a/drivers/iommu/arm/arm-smmu/Makefile b/drivers/iommu/arm/arm-smmu/Makefile
> index e240a7bcf310..b0cc01aa20c9 100644
> --- a/drivers/iommu/arm/arm-smmu/Makefile
> +++ b/drivers/iommu/arm/arm-smmu/Makefile
> @@ -1,4 +1,5 @@
> # SPDX-License-Identifier: GPL-2.0
> obj-$(CONFIG_QCOM_IOMMU) += qcom_iommu.o
> obj-$(CONFIG_ARM_SMMU) += arm_smmu.o
> -arm_smmu-objs += arm-smmu.o arm-smmu-impl.o arm-smmu-nvidia.o arm-smmu-qcom.o
> +arm_smmu-objs += arm-smmu.o arm-smmu-impl.o arm-smmu-nvidia.o
> +arm_smmu-$(CONFIG_ARM_SMMU_QCOM) += arm-smmu-qcom.o
> diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu-impl.c b/drivers/iommu/arm/arm-smmu/arm-smmu-impl.c
> index 9f465e146799..2c25cce38060 100644
> --- a/drivers/iommu/arm/arm-smmu/arm-smmu-impl.c
> +++ b/drivers/iommu/arm/arm-smmu/arm-smmu-impl.c
> @@ -215,7 +215,8 @@ struct arm_smmu_device *arm_smmu_impl_init(struct arm_smmu_device *smmu)
> of_device_is_compatible(np, "nvidia,tegra186-smmu"))
> return nvidia_smmu_impl_init(smmu);
>
> - smmu = qcom_smmu_impl_init(smmu);
> + if (IS_ENABLED(CONFIG_ARM_SMMU_QCOM))
> + smmu = qcom_smmu_impl_init(smmu);
>
> if (of_device_is_compatible(np, "marvell,ap806-smmu-500"))
> smmu->impl = &mrvl_mmu500_impl;
> 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/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 <linux/errno.h>
> -
> -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
>
^ permalink raw reply [flat|nested] 4+ messages in thread* Re: [PATCH v2 2/2] qcom_scm: hide Kconfig symbol
2021-10-07 15:10 ` [PATCH v2 2/2] qcom_scm: hide Kconfig symbol Arnd Bergmann
2021-10-11 11:37 ` Hans Verkuil
@ 2021-10-12 3:11 ` John Stultz
1 sibling, 0 replies; 4+ messages in thread
From: John Stultz @ 2021-10-12 3:11 UTC (permalink / raw)
To: Arnd Bergmann, Bjorn Andersson
Cc: lkml, linux-arm-kernel, linux-ia64, linux-mips, linux-parisc,
linux-riscv, linux-arm-msm, dri-devel,
open list:DRM DRIVER FOR MSM ADRENO GPU,
list@263.net:IOMMU DRIVERS
<iommu@lists.linux-foundation.org>,
Joerg Roedel <joro@8bytes.org>,,
linux-media, linux-mmc, Network Development, ath10k,
linux-wireless, open list:GPIO SUBSYSTEM, Arnd Bergmann,
Kalle Valo, Alex Elder, Amit Pundir, Caleb Connolly
On Thu, Oct 7, 2021 at 8:10 AM Arnd Bergmann <arnd@kernel.org> wrote:
>
> From: Arnd Bergmann <arnd@arndb.de>
>
> 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, drop the 'select RESET_CONTROLLER' statement.
> According to my testing this still builds fine, and the QCOM
> platform selects this symbol already.
>
> Acked-by: Kalle Valo <kvalo@codeaurora.org>
> Acked-by: Alex Elder <elder@linaro.org>
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> ---
> Changes in v2:
> - fix the iommu dependencies
Hey Arnd,
Thanks again so much for working out these details. Also my
apologies, as Bjorn asked for me to test this patch, but I wasn't able
to get to it before it landed. Unfortunately I've hit an issue that
is keeping the db845c from booting with this.
> diff --git a/drivers/iommu/arm/arm-smmu/Makefile b/drivers/iommu/arm/arm-smmu/Makefile
> index e240a7bcf310..b0cc01aa20c9 100644
> --- a/drivers/iommu/arm/arm-smmu/Makefile
> +++ b/drivers/iommu/arm/arm-smmu/Makefile
> @@ -1,4 +1,5 @@
> # SPDX-License-Identifier: GPL-2.0
> obj-$(CONFIG_QCOM_IOMMU) += qcom_iommu.o
> obj-$(CONFIG_ARM_SMMU) += arm_smmu.o
> -arm_smmu-objs += arm-smmu.o arm-smmu-impl.o arm-smmu-nvidia.o arm-smmu-qcom.o
> +arm_smmu-objs += arm-smmu.o arm-smmu-impl.o arm-smmu-nvidia.o
> +arm_smmu-$(CONFIG_ARM_SMMU_QCOM) += arm-smmu-qcom.o
> diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu-impl.c b/drivers/iommu/arm/arm-smmu/arm-smmu-impl.c
> index 9f465e146799..2c25cce38060 100644
> --- a/drivers/iommu/arm/arm-smmu/arm-smmu-impl.c
> +++ b/drivers/iommu/arm/arm-smmu/arm-smmu-impl.c
> @@ -215,7 +215,8 @@ struct arm_smmu_device *arm_smmu_impl_init(struct arm_smmu_device *smmu)
> of_device_is_compatible(np, "nvidia,tegra186-smmu"))
> return nvidia_smmu_impl_init(smmu);
>
> - smmu = qcom_smmu_impl_init(smmu);
> + if (IS_ENABLED(CONFIG_ARM_SMMU_QCOM))
> + smmu = qcom_smmu_impl_init(smmu);
>
> if (of_device_is_compatible(np, "marvell,ap806-smmu-500"))
> smmu->impl = &mrvl_mmu500_impl;
The problem with these two chunks is that there is currently no
CONFIG_ARM_SMMU_QCOM option. :)
Was that something you intended to add in the patch?
I'm working up a Kconfig patch to do so, so I'll send that out in a
second here, but let me know if you already have that somewhere (I
suspect you implemented it and just forgot to add the change to the
commit), as I'm sure your Kconfig help text will be better than mine.
:)
Again, I'm so sorry I didn't get over to testing your patch before
seeing this here!
thanks
-john
^ permalink raw reply [flat|nested] 4+ messages in thread