#include <linux/pci.h>
#include <linux/bitops.h>
#include <asm/processor.h>
+#include <asm/msr.h>
MODULE_DESCRIPTION("AMD Family 15h CPU processor power monitor");
MODULE_AUTHOR("Andreas Herrmann <herrmann.der.user@googlemail.com>");
#define REG_TDP_RUNNING_AVERAGE 0xe0
#define REG_TDP_LIMIT3 0xe8
+#define FAM15H_MIN_NUM_ATTRS 2
+#define FAM15H_NUM_GROUPS 2
+
+#define MSR_F15H_CU_MAX_PWR_ACCUMULATOR 0xc001007b
+
struct fam15h_power_data {
struct pci_dev *pdev;
unsigned int tdp_to_watts;
unsigned int base_tdp;
unsigned int processor_pwr_watts;
+ unsigned int cpu_pwr_sample_ratio;
+ const struct attribute_group *groups[FAM15H_NUM_GROUPS];
+ struct attribute_group group;
+ /* maximum accumulated power of a compute unit */
+ u64 max_cu_acc_power;
};
static ssize_t show_power(struct device *dev,
pci_bus_read_config_dword(f4->bus, PCI_DEVFN(PCI_SLOT(f4->devfn), 5),
REG_TDP_RUNNING_AVERAGE, &val);
- running_avg_capture = (val >> 4) & 0x3fffff;
- running_avg_capture = sign_extend32(running_avg_capture, 21);
+
+ /*
+ * On Carrizo and later platforms, TdpRunAvgAccCap bit field
+ * is extended to 4:31 from 4:25.
+ */
+ if (boot_cpu_data.x86 == 0x15 && boot_cpu_data.x86_model >= 0x60) {
+ running_avg_capture = val >> 4;
+ running_avg_capture = sign_extend32(running_avg_capture, 27);
+ } else {
+ running_avg_capture = (val >> 4) & 0x3fffff;
+ running_avg_capture = sign_extend32(running_avg_capture, 21);
+ }
+
running_avg_range = (val & 0xf) + 1;
pci_bus_read_config_dword(f4->bus, PCI_DEVFN(PCI_SLOT(f4->devfn), 5),
}
static DEVICE_ATTR(power1_crit, S_IRUGO, show_power_crit, NULL);
-static umode_t fam15h_power_is_visible(struct kobject *kobj,
- struct attribute *attr,
- int index)
+static int fam15h_power_init_attrs(struct pci_dev *pdev,
+ struct fam15h_power_data *data)
{
- /* power1_input is only reported for Fam15h, Models 00h-0fh */
- if (attr == &dev_attr_power1_input.attr &&
- (boot_cpu_data.x86 != 0x15 || boot_cpu_data.x86_model > 0xf))
- return 0;
+ int n = FAM15H_MIN_NUM_ATTRS;
+ struct attribute **fam15h_power_attrs;
+ struct cpuinfo_x86 *c = &boot_cpu_data;
- return attr->mode;
-}
+ if (c->x86 == 0x15 &&
+ (c->x86_model <= 0xf ||
+ (c->x86_model >= 0x60 && c->x86_model <= 0x6f)))
+ n += 1;
-static struct attribute *fam15h_power_attrs[] = {
- &dev_attr_power1_input.attr,
- &dev_attr_power1_crit.attr,
- NULL
-};
+ fam15h_power_attrs = devm_kcalloc(&pdev->dev, n,
+ sizeof(*fam15h_power_attrs),
+ GFP_KERNEL);
-static const struct attribute_group fam15h_power_group = {
- .attrs = fam15h_power_attrs,
- .is_visible = fam15h_power_is_visible,
-};
-__ATTRIBUTE_GROUPS(fam15h_power);
+ if (!fam15h_power_attrs)
+ return -ENOMEM;
+
+ n = 0;
+ fam15h_power_attrs[n++] = &dev_attr_power1_crit.attr;
+ if (c->x86 == 0x15 &&
+ (c->x86_model <= 0xf ||
+ (c->x86_model >= 0x60 && c->x86_model <= 0x6f)))
+ fam15h_power_attrs[n++] = &dev_attr_power1_input.attr;
+
+ data->group.attrs = fam15h_power_attrs;
+
+ return 0;
+}
-static bool fam15h_power_is_internal_node0(struct pci_dev *f4)
+static bool should_load_on_this_node(struct pci_dev *f4)
{
u32 val;
#define fam15h_power_resume NULL
#endif
-static void fam15h_power_init_data(struct pci_dev *f4,
- struct fam15h_power_data *data)
+static int fam15h_power_init_data(struct pci_dev *f4,
+ struct fam15h_power_data *data)
{
- u32 val;
+ u32 val, eax, ebx, ecx, edx;
u64 tmp;
+ int ret;
pci_read_config_dword(f4, REG_PROCESSOR_TDP, &val);
data->base_tdp = val >> 16;
/* convert to microWatt */
data->processor_pwr_watts = (tmp * 15625) >> 10;
+
+ ret = fam15h_power_init_attrs(f4, data);
+ if (ret)
+ return ret;
+
+ cpuid(0x80000007, &eax, &ebx, &ecx, &edx);
+
+ /* CPUID Fn8000_0007:EDX[12] indicates to support accumulated power */
+ if (!(edx & BIT(12)))
+ return 0;
+
+ /*
+ * determine the ratio of the compute unit power accumulator
+ * sample period to the PTSC counter period by executing CPUID
+ * Fn8000_0007:ECX
+ */
+ data->cpu_pwr_sample_ratio = ecx;
+
+ if (rdmsrl_safe(MSR_F15H_CU_MAX_PWR_ACCUMULATOR, &tmp)) {
+ pr_err("Failed to read max compute unit power accumulator MSR\n");
+ return -ENODEV;
+ }
+
+ data->max_cu_acc_power = tmp;
+
+ return 0;
}
static int fam15h_power_probe(struct pci_dev *pdev,
- const struct pci_device_id *id)
+ const struct pci_device_id *id)
{
struct fam15h_power_data *data;
struct device *dev = &pdev->dev;
struct device *hwmon_dev;
+ int ret;
/*
* though we ignore every other northbridge, we still have to
*/
tweak_runavg_range(pdev);
- if (!fam15h_power_is_internal_node0(pdev))
+ if (!should_load_on_this_node(pdev))
return -ENODEV;
data = devm_kzalloc(dev, sizeof(struct fam15h_power_data), GFP_KERNEL);
if (!data)
return -ENOMEM;
- fam15h_power_init_data(pdev, data);
+ ret = fam15h_power_init_data(pdev, data);
+ if (ret)
+ return ret;
+
data->pdev = pdev;
+ data->groups[0] = &data->group;
+
hwmon_dev = devm_hwmon_device_register_with_groups(dev, "fam15h_power",
data,
- fam15h_power_groups);
+ &data->groups[0]);
return PTR_ERR_OR_ZERO(hwmon_dev);
}
static const struct pci_device_id fam15h_power_id_table[] = {
{ PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_15H_NB_F4) },
{ PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_15H_M30H_NB_F4) },
+ { PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_15H_M60H_NB_F4) },
{ PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_16H_NB_F4) },
{ PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_16H_M30H_NB_F4) },
{}
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