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RISC-V: Create unique identification for SoC PMU
The SBI PMU platform driver did not provide any identification for perf events matching. This patch introduces a new sysfs file inside the platform device (soc:pmu/id) for pmu identification. The identification is a 64-bit value generated as: [63-32]: mvendorid; [31]: marchid[MSB]; [30-16]: marchid[15-0]; [15-0]: mimpid[15MSBs]; The CSRs are detailed in the RISC-V privileged spec [1]. The marchid is split in MSB + 15LSBs, due to the MSB being used for open-source architecture identification. [1] https://github.com/riscv/riscv-isa-manual Signed-off-by: João Mário Domingos <joao.mario@tecnico.ulisboa.pt>
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1 changed files with 47 additions and 0 deletions
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@ -1019,6 +1019,46 @@ static struct ctl_table sbi_pmu_sysctl_table[] = {
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{ }
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};
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static uint64_t pmu_sbi_get_pmu_id(void)
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{
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union sbi_pmu_id {
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uint64_t value;
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struct {
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uint16_t imp:16;
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uint16_t arch:16;
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uint32_t vendor:32;
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};
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} pmuid;
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pmuid.value = 0;
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pmuid.vendor = (uint32_t) sbi_get_mvendorid();
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pmuid.arch = (sbi_get_marchid() >> (63 - 15) & (1 << 15)) | (sbi_get_marchid() & 0x7FFF);
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pmuid.imp = (sbi_get_mimpid() >> 16);
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return pmuid.value;
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}
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static ssize_t pmu_sbi_id_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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int len;
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len = sprintf(buf, "0x%llx\n", pmu_sbi_get_pmu_id());
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if (len <= 0)
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dev_err(dev, "mydrv: Invalid sprintf len: %dn", len);
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return len;
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}
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static DEVICE_ATTR(id, S_IRUGO | S_IWUSR, pmu_sbi_id_show, 0);
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static struct attribute *pmu_sbi_attrs[] = {
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&dev_attr_id.attr,
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NULL
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};
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ATTRIBUTE_GROUPS(pmu_sbi);
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static int pmu_sbi_device_probe(struct platform_device *pdev)
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{
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struct riscv_pmu *pmu = NULL;
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@ -1067,6 +1107,13 @@ static int pmu_sbi_device_probe(struct platform_device *pdev)
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pmu->event_unmapped = pmu_sbi_event_unmapped;
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pmu->csr_index = pmu_sbi_csr_index;
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ret = sysfs_create_group(&pdev->dev.kobj, &pmu_sbi_group);
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if (ret) {
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dev_err(&pdev->dev, "sysfs creation failed\n");
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return ret;
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}
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pdev->dev.groups = pmu_sbi_groups;
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ret = cpuhp_state_add_instance(CPUHP_AP_PERF_RISCV_STARTING, &pmu->node);
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if (ret)
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return ret;
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