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Date: Tue, 7 Mar 2023 17:23:29 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Maximilian Luz <luzmaximilian@...il.com>,
Bjorn Andersson <andersson@...nel.org>
Cc: Andy Gross <agross@...nel.org>,
Konrad Dybcio <konrad.dybcio@...aro.org>,
Ard Biesheuvel <ardb@...nel.org>,
Rob Herring <robh+dt@...nel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
Johan Hovold <johan@...nel.org>,
Sudeep Holla <sudeep.holla@....com>,
Ilias Apalodimas <ilias.apalodimas@...aro.org>,
Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
Sumit Garg <sumit.garg@...aro.org>,
Steev Klimaszewski <steev@...i.org>,
linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 1/4] firmware: qcom_scm: Export SCM call functions
On 05/03/2023 04:21, Maximilian Luz wrote:
> Make qcom_scm_call, qcom_scm_call_atomic and associated types accessible
> to other modules.
Generally all the qcom_scm calls are a part of qcom_scm.c. I think it is
better to make qseecom_scm_call a part qcom_scm.c (as we were previously
doing) rather than exporting the core function.
If you wish to limit the kernel bloat, you can split the qcom_scm into
per-driver backend and add Kconfig symbols to limit the impact. However
I think that these functions are pretty small to justify the effort.
>
> Signed-off-by: Maximilian Luz <luzmaximilian@...il.com>
> ---
>
> Changes in v3:
> - Rebase ontop of latest qcom_scm changes.
> - Fix doc-comment.
>
> Changes in v2:
> - No functional changes.
>
> ---
> drivers/firmware/qcom_scm.c | 120 ++++++++++++++++---------
> drivers/firmware/qcom_scm.h | 47 ----------
> include/linux/firmware/qcom/qcom_scm.h | 49 ++++++++++
> 3 files changed, 129 insertions(+), 87 deletions(-)
>
> diff --git a/drivers/firmware/qcom_scm.c b/drivers/firmware/qcom_scm.c
> index 468d4d5ab550..9b3e4449a563 100644
> --- a/drivers/firmware/qcom_scm.c
> +++ b/drivers/firmware/qcom_scm.c
> @@ -212,16 +212,17 @@ static enum qcom_scm_convention __get_convention(void)
> }
>
> /**
> - * qcom_scm_call() - Invoke a syscall in the secure world
> - * @dev: device
> + * __qcom_scm_call() - Invoke a syscall in the secure world
> + * @dev: Device. Depending on the command and number of arguments, this
> + * is optional.
> * @desc: Descriptor structure containing arguments and return values
> * @res: Structure containing results from SMC/HVC call
> *
> * Sends a command to the SCM and waits for the command to finish processing.
> * This should *only* be called in pre-emptible context.
> */
> -static int qcom_scm_call(struct device *dev, const struct qcom_scm_desc *desc,
> - struct qcom_scm_res *res)
> +static int __qcom_scm_call(struct device *dev, const struct qcom_scm_desc *desc,
> + struct qcom_scm_res *res)
> {
> might_sleep();
> switch (__get_convention()) {
> @@ -237,17 +238,38 @@ static int qcom_scm_call(struct device *dev, const struct qcom_scm_desc *desc,
> }
>
> /**
> - * qcom_scm_call_atomic() - atomic variation of qcom_scm_call()
> - * @dev: device
> + * qcom_scm_call() - Invoke a syscall in the secure world
> + * @desc: Descriptor structure containing arguments and return values
> + * @res: Structure containing results from SMC/HVC call
> + *
> + * Sends a command to the SCM and waits for the command to finish processing.
> + * This should *only* be called in pre-emptible context.
> + *
> + * Returns zero on success, -ENODEV if the SCM device has not been set up yet,
> + * or other non-zero status codes on failure.
> + */
> +int qcom_scm_call(const struct qcom_scm_desc *desc, struct qcom_scm_res *res)
> +{
> + if (!__scm)
> + return -ENODEV;
> +
> + return __qcom_scm_call(__scm->dev, desc, res);
> +}
> +EXPORT_SYMBOL_GPL(qcom_scm_call);
> +
> +/**
> + * __qcom_scm_call_atomic() - atomic variation of __qcom_scm_call()
> + * @dev: Device. Depending on the command and number of arguments, this
> + * is optional.
> * @desc: Descriptor structure containing arguments and return values
> * @res: Structure containing results from SMC/HVC call
> *
> * Sends a command to the SCM and waits for the command to finish processing.
> * This can be called in atomic context.
> */
> -static int qcom_scm_call_atomic(struct device *dev,
> - const struct qcom_scm_desc *desc,
> - struct qcom_scm_res *res)
> +static int __qcom_scm_call_atomic(struct device *dev,
> + const struct qcom_scm_desc *desc,
> + struct qcom_scm_res *res)
> {
> switch (__get_convention()) {
> case SMC_CONVENTION_ARM_32:
> @@ -261,6 +283,26 @@ static int qcom_scm_call_atomic(struct device *dev,
> }
> }
>
> +/**
> + * qcom_scm_call_atomic() - atomic variation of qcom_scm_call()
> + * @desc: Descriptor structure containing arguments and return values
> + * @res: Structure containing results from SMC/HVC call
> + *
> + * Sends a command to the SCM and waits for the command to finish processing.
> + * This can be called in atomic context.
> + *
> + * Returns zero on success, -ENODEV if the SCM device has not been set up yet,
> + * or other non-zero status codes on failure.
> + */
> +int qcom_scm_call_atomic(const struct qcom_scm_desc *desc, struct qcom_scm_res *res)
> +{
> + if (!__scm)
> + return -ENODEV;
> +
> + return __qcom_scm_call_atomic(__scm->dev, desc, res);
> +}
> +EXPORT_SYMBOL_GPL(qcom_scm_call_atomic);
> +
> static bool __qcom_scm_is_call_available(struct device *dev, u32 svc_id,
> u32 cmd_id)
> {
> @@ -287,7 +329,7 @@ static bool __qcom_scm_is_call_available(struct device *dev, u32 svc_id,
> return false;
> }
>
> - ret = qcom_scm_call(dev, &desc, &res);
> + ret = __qcom_scm_call(dev, &desc, &res);
>
> return ret ? false : !!res.result[0];
> }
> @@ -312,7 +354,7 @@ static int qcom_scm_set_boot_addr(void *entry, const u8 *cpu_bits)
> desc.args[0] = flags;
> desc.args[1] = virt_to_phys(entry);
>
> - return qcom_scm_call_atomic(__scm ? __scm->dev : NULL, &desc, NULL);
> + return __qcom_scm_call_atomic(__scm ? __scm->dev : NULL, &desc, NULL);
> }
>
> static int qcom_scm_set_boot_addr_mc(void *entry, unsigned int flags)
> @@ -334,7 +376,7 @@ static int qcom_scm_set_boot_addr_mc(void *entry, unsigned int flags)
> if (!__scm || __get_convention() == SMC_CONVENTION_LEGACY)
> return -EOPNOTSUPP;
>
> - return qcom_scm_call(__scm->dev, &desc, NULL);
> + return __qcom_scm_call(__scm->dev, &desc, NULL);
> }
>
> /**
> @@ -384,7 +426,7 @@ void qcom_scm_cpu_power_down(u32 flags)
> .owner = ARM_SMCCC_OWNER_SIP,
> };
>
> - qcom_scm_call_atomic(__scm ? __scm->dev : NULL, &desc, NULL);
> + __qcom_scm_call_atomic(__scm ? __scm->dev : NULL, &desc, NULL);
> }
> EXPORT_SYMBOL(qcom_scm_cpu_power_down);
>
> @@ -401,7 +443,7 @@ int qcom_scm_set_remote_state(u32 state, u32 id)
> struct qcom_scm_res res;
> int ret;
>
> - ret = qcom_scm_call(__scm->dev, &desc, &res);
> + ret = qcom_scm_call(&desc, &res);
>
> return ret ? : res.result[0];
> }
> @@ -419,7 +461,7 @@ static int __qcom_scm_set_dload_mode(struct device *dev, bool enable)
>
> desc.args[1] = enable ? QCOM_SCM_BOOT_SET_DLOAD_MODE : 0;
>
> - return qcom_scm_call_atomic(__scm->dev, &desc, NULL);
> + return qcom_scm_call_atomic(&desc, NULL);
> }
>
> static void qcom_scm_set_download_mode(bool enable)
> @@ -499,7 +541,7 @@ int qcom_scm_pas_init_image(u32 peripheral, const void *metadata, size_t size,
>
> desc.args[1] = mdata_phys;
>
> - ret = qcom_scm_call(__scm->dev, &desc, &res);
> + ret = __qcom_scm_call(__scm->dev, &desc, &res);
>
> qcom_scm_bw_disable();
> qcom_scm_clk_disable();
> @@ -565,7 +607,7 @@ int qcom_scm_pas_mem_setup(u32 peripheral, phys_addr_t addr, phys_addr_t size)
> if (ret)
> return ret;
>
> - ret = qcom_scm_call(__scm->dev, &desc, &res);
> + ret = qcom_scm_call(&desc, &res);
> qcom_scm_bw_disable();
> qcom_scm_clk_disable();
>
> @@ -600,7 +642,7 @@ int qcom_scm_pas_auth_and_reset(u32 peripheral)
> if (ret)
> return ret;
>
> - ret = qcom_scm_call(__scm->dev, &desc, &res);
> + ret = qcom_scm_call(&desc, &res);
> qcom_scm_bw_disable();
> qcom_scm_clk_disable();
>
> @@ -634,7 +676,7 @@ int qcom_scm_pas_shutdown(u32 peripheral)
> if (ret)
> return ret;
>
> - ret = qcom_scm_call(__scm->dev, &desc, &res);
> + ret = qcom_scm_call(&desc, &res);
>
> qcom_scm_bw_disable();
> qcom_scm_clk_disable();
> @@ -666,7 +708,7 @@ bool qcom_scm_pas_supported(u32 peripheral)
> QCOM_SCM_PIL_PAS_IS_SUPPORTED))
> return false;
>
> - ret = qcom_scm_call(__scm->dev, &desc, &res);
> + ret = __qcom_scm_call(__scm->dev, &desc, &res);
>
> return ret ? false : !!res.result[0];
> }
> @@ -685,7 +727,7 @@ static int __qcom_scm_pas_mss_reset(struct device *dev, bool reset)
> struct qcom_scm_res res;
> int ret;
>
> - ret = qcom_scm_call(__scm->dev, &desc, &res);
> + ret = qcom_scm_call(&desc, &res);
>
> return ret ? : res.result[0];
> }
> @@ -725,8 +767,7 @@ int qcom_scm_io_readl(phys_addr_t addr, unsigned int *val)
> struct qcom_scm_res res;
> int ret;
>
> -
> - ret = qcom_scm_call_atomic(__scm->dev, &desc, &res);
> + ret = qcom_scm_call_atomic(&desc, &res);
> if (ret >= 0)
> *val = res.result[0];
>
> @@ -745,7 +786,7 @@ int qcom_scm_io_writel(phys_addr_t addr, unsigned int val)
> .owner = ARM_SMCCC_OWNER_SIP,
> };
>
> - return qcom_scm_call_atomic(__scm->dev, &desc, NULL);
> + return qcom_scm_call_atomic(&desc, NULL);
> }
> EXPORT_SYMBOL(qcom_scm_io_writel);
>
> @@ -775,7 +816,7 @@ int qcom_scm_restore_sec_cfg(u32 device_id, u32 spare)
> struct qcom_scm_res res;
> int ret;
>
> - ret = qcom_scm_call(__scm->dev, &desc, &res);
> + ret = qcom_scm_call(&desc, &res);
>
> return ret ? : res.result[0];
> }
> @@ -793,7 +834,7 @@ int qcom_scm_iommu_secure_ptbl_size(u32 spare, size_t *size)
> struct qcom_scm_res res;
> int ret;
>
> - ret = qcom_scm_call(__scm->dev, &desc, &res);
> + ret = qcom_scm_call(&desc, &res);
>
> if (size)
> *size = res.result[0];
> @@ -816,7 +857,7 @@ int qcom_scm_iommu_secure_ptbl_init(u64 addr, u32 size, u32 spare)
> };
> int ret;
>
> - ret = qcom_scm_call(__scm->dev, &desc, NULL);
> + ret = qcom_scm_call(&desc, NULL);
>
> /* the pg table has been initialized already, ignore the error */
> if (ret == -EPERM)
> @@ -837,7 +878,7 @@ int qcom_scm_iommu_set_cp_pool_size(u32 spare, u32 size)
> .owner = ARM_SMCCC_OWNER_SIP,
> };
>
> - return qcom_scm_call(__scm->dev, &desc, NULL);
> + return qcom_scm_call(&desc, NULL);
> }
> EXPORT_SYMBOL(qcom_scm_iommu_set_cp_pool_size);
>
> @@ -859,7 +900,7 @@ int qcom_scm_mem_protect_video_var(u32 cp_start, u32 cp_size,
> };
> struct qcom_scm_res res;
>
> - ret = qcom_scm_call(__scm->dev, &desc, &res);
> + ret = qcom_scm_call(&desc, &res);
>
> return ret ? : res.result[0];
> }
> @@ -887,7 +928,7 @@ static int __qcom_scm_assign_mem(struct device *dev, phys_addr_t mem_region,
> };
> struct qcom_scm_res res;
>
> - ret = qcom_scm_call(dev, &desc, &res);
> + ret = __qcom_scm_call(dev, &desc, &res);
>
> return ret ? : res.result[0];
> }
> @@ -1004,7 +1045,7 @@ int qcom_scm_ocmem_lock(enum qcom_scm_ocmem_client id, u32 offset, u32 size,
> .arginfo = QCOM_SCM_ARGS(4),
> };
>
> - return qcom_scm_call(__scm->dev, &desc, NULL);
> + return qcom_scm_call(&desc, NULL);
> }
> EXPORT_SYMBOL(qcom_scm_ocmem_lock);
>
> @@ -1027,7 +1068,7 @@ int qcom_scm_ocmem_unlock(enum qcom_scm_ocmem_client id, u32 offset, u32 size)
> .arginfo = QCOM_SCM_ARGS(3),
> };
>
> - return qcom_scm_call(__scm->dev, &desc, NULL);
> + return qcom_scm_call(&desc, NULL);
> }
> EXPORT_SYMBOL(qcom_scm_ocmem_unlock);
>
> @@ -1068,7 +1109,7 @@ int qcom_scm_ice_invalidate_key(u32 index)
> .owner = ARM_SMCCC_OWNER_SIP,
> };
>
> - return qcom_scm_call(__scm->dev, &desc, NULL);
> + return qcom_scm_call(&desc, NULL);
> }
> EXPORT_SYMBOL(qcom_scm_ice_invalidate_key);
>
> @@ -1129,7 +1170,7 @@ int qcom_scm_ice_set_key(u32 index, const u8 *key, u32 key_size,
> memcpy(keybuf, key, key_size);
> desc.args[1] = key_phys;
>
> - ret = qcom_scm_call(__scm->dev, &desc, NULL);
> + ret = qcom_scm_call(&desc, NULL);
>
> memzero_explicit(keybuf, key_size);
>
> @@ -1198,7 +1239,7 @@ int qcom_scm_hdcp_req(struct qcom_scm_hdcp_req *req, u32 req_cnt, u32 *resp)
> if (ret)
> return ret;
>
> - ret = qcom_scm_call(__scm->dev, &desc, &res);
> + ret = qcom_scm_call(&desc, &res);
> *resp = res.result[0];
>
> qcom_scm_clk_disable();
> @@ -1219,7 +1260,7 @@ int qcom_scm_iommu_set_pt_format(u32 sec_id, u32 ctx_num, u32 pt_fmt)
> .owner = ARM_SMCCC_OWNER_SIP,
> };
>
> - return qcom_scm_call(__scm->dev, &desc, NULL);
> + return qcom_scm_call(&desc, NULL);
> }
> EXPORT_SYMBOL(qcom_scm_iommu_set_pt_format);
>
> @@ -1234,8 +1275,7 @@ int qcom_scm_qsmmu500_wait_safe_toggle(bool en)
> .owner = ARM_SMCCC_OWNER_SIP,
> };
>
> -
> - return qcom_scm_call_atomic(__scm->dev, &desc, NULL);
> + return qcom_scm_call_atomic(&desc, NULL);
> }
> EXPORT_SYMBOL(qcom_scm_qsmmu500_wait_safe_toggle);
>
> @@ -1255,7 +1295,7 @@ int qcom_scm_lmh_profile_change(u32 profile_id)
> .owner = ARM_SMCCC_OWNER_SIP,
> };
>
> - return qcom_scm_call(__scm->dev, &desc, NULL);
> + return qcom_scm_call(&desc, NULL);
> }
> EXPORT_SYMBOL(qcom_scm_lmh_profile_change);
>
> @@ -1290,7 +1330,7 @@ int qcom_scm_lmh_dcvsh(u32 payload_fn, u32 payload_reg, u32 payload_val,
>
> desc.args[0] = payload_phys;
>
> - ret = qcom_scm_call(__scm->dev, &desc, NULL);
> + ret = __qcom_scm_call(__scm->dev, &desc, NULL);
>
> dma_free_coherent(__scm->dev, payload_size, payload_buf, payload_phys);
> return ret;
> diff --git a/drivers/firmware/qcom_scm.h b/drivers/firmware/qcom_scm.h
> index e6e512bd57d1..87eb726be7d0 100644
> --- a/drivers/firmware/qcom_scm.h
> +++ b/drivers/firmware/qcom_scm.h
> @@ -13,53 +13,6 @@ enum qcom_scm_convention {
>
> extern enum qcom_scm_convention qcom_scm_convention;
>
> -#define MAX_QCOM_SCM_ARGS 10
> -#define MAX_QCOM_SCM_RETS 3
> -
> -enum qcom_scm_arg_types {
> - QCOM_SCM_VAL,
> - QCOM_SCM_RO,
> - QCOM_SCM_RW,
> - QCOM_SCM_BUFVAL,
> -};
> -
> -#define QCOM_SCM_ARGS_IMPL(num, a, b, c, d, e, f, g, h, i, j, ...) (\
> - (((a) & 0x3) << 4) | \
> - (((b) & 0x3) << 6) | \
> - (((c) & 0x3) << 8) | \
> - (((d) & 0x3) << 10) | \
> - (((e) & 0x3) << 12) | \
> - (((f) & 0x3) << 14) | \
> - (((g) & 0x3) << 16) | \
> - (((h) & 0x3) << 18) | \
> - (((i) & 0x3) << 20) | \
> - (((j) & 0x3) << 22) | \
> - ((num) & 0xf))
> -
> -#define QCOM_SCM_ARGS(...) QCOM_SCM_ARGS_IMPL(__VA_ARGS__, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0)
> -
> -
> -/**
> - * struct qcom_scm_desc
> - * @arginfo: Metadata describing the arguments in args[]
> - * @args: The array of arguments for the secure syscall
> - */
> -struct qcom_scm_desc {
> - u32 svc;
> - u32 cmd;
> - u32 arginfo;
> - u64 args[MAX_QCOM_SCM_ARGS];
> - u32 owner;
> -};
> -
> -/**
> - * struct qcom_scm_res
> - * @result: The values returned by the secure syscall
> - */
> -struct qcom_scm_res {
> - u64 result[MAX_QCOM_SCM_RETS];
> -};
> -
> int qcom_scm_wait_for_wq_completion(u32 wq_ctx);
> int scm_get_wq_ctx(u32 *wq_ctx, u32 *flags, u32 *more_pending);
>
> diff --git a/include/linux/firmware/qcom/qcom_scm.h b/include/linux/firmware/qcom/qcom_scm.h
> index 1e449a5d7f5c..162746467c22 100644
> --- a/include/linux/firmware/qcom/qcom_scm.h
> +++ b/include/linux/firmware/qcom/qcom_scm.h
> @@ -11,6 +11,55 @@
>
> #include <dt-bindings/firmware/qcom,scm.h>
>
> +#define QCOM_SCM_ARGS_IMPL(num, a, b, c, d, e, f, g, h, i, j, ...) (\
> + (((a) & 0x3) << 4) | \
> + (((b) & 0x3) << 6) | \
> + (((c) & 0x3) << 8) | \
> + (((d) & 0x3) << 10) | \
> + (((e) & 0x3) << 12) | \
> + (((f) & 0x3) << 14) | \
> + (((g) & 0x3) << 16) | \
> + (((h) & 0x3) << 18) | \
> + (((i) & 0x3) << 20) | \
> + (((j) & 0x3) << 22) | \
> + ((num) & 0xf))
> +
> +#define QCOM_SCM_ARGS(...) QCOM_SCM_ARGS_IMPL(__VA_ARGS__, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0)
> +
> +#define MAX_QCOM_SCM_ARGS 10
> +#define MAX_QCOM_SCM_RETS 3
> +
> +enum qcom_scm_arg_types {
> + QCOM_SCM_VAL,
> + QCOM_SCM_RO,
> + QCOM_SCM_RW,
> + QCOM_SCM_BUFVAL,
> +};
> +
> +/**
> + * struct qcom_scm_desc - SCM call descriptor.
> + * @arginfo: Metadata describing the arguments in args[]
> + * @args: The array of arguments for the secure syscall
> + */
> +struct qcom_scm_desc {
> + u32 svc;
> + u32 cmd;
> + u32 arginfo;
> + u64 args[MAX_QCOM_SCM_ARGS];
> + u32 owner;
> +};
> +
> +/**
> + * struct qcom_scm_res - SCM call response.
> + * @result: The values returned by the secure syscall
> + */
> +struct qcom_scm_res {
> + u64 result[MAX_QCOM_SCM_RETS];
> +};
> +
> +int qcom_scm_call(const struct qcom_scm_desc *desc, struct qcom_scm_res *res);
> +int qcom_scm_call_atomic(const struct qcom_scm_desc *desc, struct qcom_scm_res *res);
> +
> #define QCOM_SCM_VERSION(major, minor) (((major) << 16) | ((minor) & 0xFF))
> #define QCOM_SCM_CPU_PWR_DOWN_L2_ON 0x0
> #define QCOM_SCM_CPU_PWR_DOWN_L2_OFF 0x1
--
With best wishes
Dmitry
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