qcom_scm: hide Kconfig symbol

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>

diff --git a/drivers/firmware/Kconfig b/drivers/firmware/Kconfig
index 220a58c..cda7d71 100644 (file)
--- 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 e9c6af7..3ddf739 100644 (file)
--- 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 124c41a..c5c71b7 100644 (file)
--- 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 e240a7b..b0cc01a 100644 (file)
--- 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 9f465e1..2c25cce 100644 (file)
--- 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 157c924..80321e0 100644 (file)
--- 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 7131396..95b3511 100644 (file)
--- 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 8f99cfa..d037682 100644 (file)
--- 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 741289e..ca007b8 100644 (file)
--- 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 32ea2a8..5ff4207 100644 (file)
--- 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 7d1cabe..63ccb52 100644 (file)
--- 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 c0475d1..81cad9e 100644 (file)
--- 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