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Message-ID: <20250225092930.GC25303@nxa18884-linux>
Date: Tue, 25 Feb 2025 17:29:31 +0800
From: Peng Fan <peng.fan@....nxp.com>
To: Cristian Marussi <cristian.marussi@....com>
Cc: Sudeep Holla <sudeep.holla@....com>, Shawn Guo <shawnguo@...nel.org>,
Sascha Hauer <s.hauer@...gutronix.de>,
Pengutronix Kernel Team <kernel@...gutronix.de>,
Fabio Estevam <festevam@...il.com>, Rob Herring <robh@...nel.org>,
Krzysztof Kozlowski <krzk+dt@...nel.org>,
Conor Dooley <conor+dt@...nel.org>,
Dan Carpenter <dan.carpenter@...aro.org>,
linux-kernel@...r.kernel.org, arm-scmi@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, imx@...ts.linux.dev,
devicetree@...r.kernel.org, Peng Fan <peng.fan@....com>
Subject: Re: [PATCH v2 4/7] firmware: arm_scmi: imx: Add i.MX95 CPU Protocol
On Mon, Feb 24, 2025 at 06:10:48PM +0000, Cristian Marussi wrote:
>On Wed, Feb 12, 2025 at 03:40:26PM +0800, Peng Fan (OSS) wrote:
>> From: Peng Fan <peng.fan@....com>
>>
>> This protocol allows an agent to start, stop a CPU or set reset vector. It
>> is used to manage auxiliary CPUs in an LM (e.g. additional cores in an AP
>> cluster).
>>
>
>Hi,
>
>> Signed-off-by: Peng Fan <peng.fan@....com>
>> ---
>> drivers/firmware/arm_scmi/vendors/imx/Kconfig | 11 +
>> drivers/firmware/arm_scmi/vendors/imx/Makefile | 1 +
>> drivers/firmware/arm_scmi/vendors/imx/imx-sm-cpu.c | 287 +++++++++++++++++++++
>> include/linux/scmi_imx_protocol.h | 10 +
>> 4 files changed, 309 insertions(+)
>>
>
>[snip]
>
>> +
>> +struct scmi_imx_cpu_info_get_out {
>> +#define CPU_RUN_MODE_START 0
>> +#define CPU_RUN_MODE_HOLD 1
>> +#define CPU_RUN_MODE_STOP 2
>> +#define CPU_RUN_MODE_SLEEP 3
>> + __le32 runmode;
>> + __le32 sleepmode;
>> + __le32 resetvectorlow;
>> + __le32 resetvectorhigh;
>> +};
>> +
>> +static int scmi_imx_cpu_validate_cpuid(const struct scmi_protocol_handle *ph,
>> + u32 cpuid)
>> +{
>> + struct scmi_imx_cpu_info *info = ph->get_priv(ph);
>> +
>> + if (cpuid >= info->nr_cpu)
>> + return -EINVAL;
>> +
>> + return 0;
>> +}
>> +
>> +static int scmi_imx_cpu_start(const struct scmi_protocol_handle *ph, u32 cpuid)
>> +{
>> + struct scmi_xfer *t;
>> + int ret;
>> +
>> + ret = scmi_imx_cpu_validate_cpuid(ph, cpuid);
>> + if (ret)
>> + return ret;
>> +
>> + ret = ph->xops->xfer_get_init(ph, SCMI_IMX_CPU_START, sizeof(u32),
>> + 0, &t);
>> + if (ret)
>> + return ret;
>> +
>> + put_unaligned_le32(cpuid, t->tx.buf);
>> + ret = ph->xops->do_xfer(ph, t);
>> +
>> + ph->xops->xfer_put(ph, t);
>> +
>> + return ret;
>> +}
>> +
>> +static int scmi_imx_cpu_stop(const struct scmi_protocol_handle *ph, u32 cpuid)
>> +{
>> + struct scmi_xfer *t;
>> + int ret;
>> +
>> + ret = scmi_imx_cpu_validate_cpuid(ph, cpuid);
>> + if (ret)
>> + return ret;
>> +
>> + ret = ph->xops->xfer_get_init(ph, SCMI_IMX_CPU_STOP, sizeof(u32),
>> + 0, &t);
>> + if (ret)
>> + return ret;
>> +
>> + put_unaligned_le32(cpuid, t->tx.buf);
>> + ret = ph->xops->do_xfer(ph, t);
>> +
>> + ph->xops->xfer_put(ph, t);
>> +
>> + return ret;
>> +}
>> +
>
>Please refactor and unify this 2 seemingly identical start/stop funcs by
>defining a common helper...
ok. fix in next version.
>
>> +static int scmi_imx_cpu_reset_vector_set(const struct scmi_protocol_handle *ph,
>> + u32 cpuid, u64 vector, bool start,
>> + bool boot, bool resume)
>> +{
>> + struct scmi_imx_cpu_reset_vector_set_in *in;
>> + struct scmi_xfer *t;
>> + int ret;
>> + u32 flags;
>> +
>> + ret = scmi_imx_cpu_validate_cpuid(ph, cpuid);
>> + if (ret)
>> + return ret;
>> +
>> + ret = ph->xops->xfer_get_init(ph, SCMI_IMX_CPU_RESET_VECTOR_SET, sizeof(*in),
>> + 0, &t);
>> + if (ret)
>> + return ret;
>> +
>> + in = t->tx.buf;
>> + in->cpuid = cpu_to_le32(cpuid);
>> + flags = start ? CPU_VEC_FLAGS_START : 0;
>> + flags |= boot ? CPU_VEC_FLAGS_BOOT : 0;
>> + flags |= resume ? CPU_VEC_FLAGS_RESUME : 0;
>> + in->flags = cpu_to_le32(flags);
>
>...you should just avoid the endianess helper given that is a bitfield (I cannot
>exclude that there are other places where we wrongly endianIZE bitfields...) and
>I think that the best way to do it without cause smatch to cry would be
>to use le32_encode_bits() which should just produce the desired flags
>into an __le32
>
>le32_encode_bits and friends are used throughout the code base and added
>
>https://patchwork.ozlabs.org/project/ubuntu-kernel/patch/20190606034255.2192-2-aaron.ma@canonical.com/
>
>which seems to be the best (and only) documentation :P
Thanks for the pointer, I will fix in next version as you suggest.
>
>> + in->resetvectorlow = cpu_to_le32(lower_32_bits(vector));
>> + in->resetvectorhigh = cpu_to_le32(upper_32_bits(vector));
>> + ret = ph->xops->do_xfer(ph, t);
>> +
>> + ph->xops->xfer_put(ph, t);
>> +
>> + return ret;
>> +}
>> +
>> +static int scmi_imx_cpu_started(const struct scmi_protocol_handle *ph, u32 cpuid,
>> + bool *started)
>> +{
>> + struct scmi_imx_cpu_info_get_out *out;
>> + struct scmi_xfer *t;
>> + u32 mode;
>> + int ret;
>> +
>
>maybe overlay paranoid...but
>
> if (!started)
> return -EINVAL;
>
>...up to you, if you feel paranoid too
>
>> + *started = false;
>> + ret = scmi_imx_cpu_validate_cpuid(ph, cpuid);
>> + if (ret)
>> + return ret;
>> +
>> + ret = ph->xops->xfer_get_init(ph, SCMI_IMX_CPU_INFO_GET, sizeof(u32),
>> + 0, &t);
>> + if (ret)
>> + return ret;
>> +
>> + put_unaligned_le32(cpuid, t->tx.buf);
>> + ret = ph->xops->do_xfer(ph, t);
>> + if (!ret) {
>> + out = t->rx.buf;
>> + mode = le32_to_cpu(out->runmode);
>> + if ((mode == CPU_RUN_MODE_START) || (mode == CPU_RUN_MODE_SLEEP))
>> + *started = true;
>> + }
>> +
>> + ph->xops->xfer_put(ph, t);
>> +
>> + return ret;
>> +}
>> +
>> +static const struct scmi_imx_cpu_proto_ops scmi_imx_cpu_proto_ops = {
>> + .cpu_reset_vector_set = scmi_imx_cpu_reset_vector_set,
>> + .cpu_start = scmi_imx_cpu_start,
>> + .cpu_started = scmi_imx_cpu_started,
>> + .cpu_stop = scmi_imx_cpu_stop,
>> +};
>> +
>> +static int scmi_imx_cpu_protocol_attributes_get(const struct scmi_protocol_handle *ph,
>> + struct scmi_imx_cpu_info *info)
>> +{
>> + struct scmi_msg_imx_cpu_protocol_attributes *attr;
>> + struct scmi_xfer *t;
>> + int ret;
>> +
>> + ret = ph->xops->xfer_get_init(ph, PROTOCOL_ATTRIBUTES, 0,
>> + sizeof(*attr), &t);
>> + if (ret)
>> + return ret;
>> +
>> + attr = t->rx.buf;
>> +
>> + ret = ph->xops->do_xfer(ph, t);
>> + if (!ret) {
>> + info->nr_cpu = SCMI_IMX_CPU_PROTO_ATTR_NUM_CPUS(attr->attributes);
>
>
> le32_get_bits(attr->attributes, GENMASK())
Fix in next version.
>
>> + dev_info(ph->dev, "i.MX SM CPU: %d cpus\n",
>> + info->nr_cpu);
>> + }
>> +
>> + ph->xops->xfer_put(ph, t);
>> +
>> + return ret;
>> +}
>> +
>> +static int scmi_imx_cpu_attributes_get(const struct scmi_protocol_handle *ph,
>> + u32 cpuid)
>> +{
>> + struct scmi_msg_imx_cpu_attributes_out *out;
>> + char name[SCMI_SHORT_NAME_MAX_SIZE] = {'\0'};
>> + struct scmi_xfer *t;
>> + int ret;
>> +
>> + ret = ph->xops->xfer_get_init(ph, SCMI_IMX_CPU_ATTRIBUTES, sizeof(u32), 0, &t);
>> + if (ret)
>> + return ret;
>> +
>> + put_unaligned_le32(cpuid, t->tx.buf);
>> + ret = ph->xops->do_xfer(ph, t);
>> + if (!ret) {
>> + out = t->rx.buf;
>> + strscpy(name, out->name, SCMI_SHORT_NAME_MAX_SIZE);
>> + dev_info(ph->dev, "i.MX CPU: name: %s\n", name);
>> + } else {
>> + dev_err(ph->dev, "i.MX cpu: Failed to get info of cpu(%u)\n", cpuid);
>> + }
>> +
>> + ph->xops->xfer_put(ph, t);
>> +
>> + return ret;
>> +}
>> +
>> +static int scmi_imx_cpu_protocol_init(const struct scmi_protocol_handle *ph)
>> +{
>> + struct scmi_imx_cpu_info *info;
>> + u32 version;
>> + int ret, i;
>> +
>> + ret = ph->xops->version_get(ph, &version);
>> + if (ret)
>> + return ret;
>> +
>> + dev_info(ph->dev, "NXP SM CPU Protocol Version %d.%d\n",
>> + PROTOCOL_REV_MAJOR(version), PROTOCOL_REV_MINOR(version));
>> +
>> + info = devm_kzalloc(ph->dev, sizeof(*info), GFP_KERNEL);
>> + if (!info)
>> + return -ENOMEM;
>> +
>> + ret = scmi_imx_cpu_protocol_attributes_get(ph, info);
>> + if (ret)
>> + return ret;
>> +
>> + for (i = 0; i < info->nr_cpu; i++) {
>> + ret = scmi_imx_cpu_attributes_get(ph, i);
>> + if (ret)
>> + return ret;
>> + }
>> +
>> + return ph->set_priv(ph, info, version);
>> +}
>> +
>> +static const struct scmi_protocol scmi_imx_cpu = {
>> + .id = SCMI_PROTOCOL_IMX_CPU,
>> + .owner = THIS_MODULE,
>> + .instance_init = &scmi_imx_cpu_protocol_init,
>> + .ops = &scmi_imx_cpu_proto_ops,
>> + .supported_version = SCMI_PROTOCOL_SUPPORTED_VERSION,
>> + .vendor_id = SCMI_IMX_VENDOR,
>> + .sub_vendor_id = SCMI_IMX_SUBVENDOR,
>> +};
>> +module_scmi_protocol(scmi_imx_cpu);
>
>similarly as LMM...
>
>MODULE_ALIAS("scmi-protocol-" __stringify(SCMI_PROTOCOL_IMX_CPU) "-" SCMI_IMX_VENDOR);
Fix in next version
Appreciate again for reviewing the large patchset.
Thanks,
Peng
>
>Thanks
>Cristian
>
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