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virt: acrn: Introduce interfaces to query C-states and P-states allowed by hypervisor 

The C-states and P-states data are used to support CPU power management.
The hypervisor controls C-states and P-states for a User VM.

ACRN userspace need to query the data from the hypervisor to build ACPI
tables for a User VM.

HSM provides ioctls for ACRN userspace to query C-states and P-states
data obtained from the hypervisor.

Cc: Zhi Wang <zhi.a.wang@intel.com>
Cc: Zhenyu Wang <zhenyuw@linux.intel.com>
Cc: Yu Wang <yu1.wang@intel.com>
Cc: Reinette Chatre <reinette.chatre@intel.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Zhi Wang <zhi.a.wang@intel.com>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: Shuo Liu <shuo.a.liu@intel.com>
Link: https://lore.kernel.org/r/20210207031040.49576-14-shuo.a.liu@intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
master
Shuo Liu 2021-02-07 11:10:35 +08:00 committed by Greg Kroah-Hartman
parent c7cf8d2724
commit 3d679d5aec
3 changed files with 136 additions and 0 deletions
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69
drivers/virt/acrn/hsm.c
View File

@ -38,6 +38,67 @@ static int acrn_dev_open(struct inode *inode, struct file *filp)
return 0;
}
static int pmcmd_ioctl(u64 cmd, void __user *uptr)
{
struct acrn_pstate_data *px_data;
struct acrn_cstate_data *cx_data;
u64 *pm_info;
int ret = 0;
switch (cmd & PMCMD_TYPE_MASK) {
case ACRN_PMCMD_GET_PX_CNT:
case ACRN_PMCMD_GET_CX_CNT:
pm_info = kmalloc(sizeof(u64), GFP_KERNEL);
if (!pm_info)
return -ENOMEM;
ret = hcall_get_cpu_state(cmd, virt_to_phys(pm_info));
if (ret < 0) {
kfree(pm_info);
break;
}
if (copy_to_user(uptr, pm_info, sizeof(u64)))
ret = -EFAULT;
kfree(pm_info);
break;
case ACRN_PMCMD_GET_PX_DATA:
px_data = kmalloc(sizeof(*px_data), GFP_KERNEL);
if (!px_data)
return -ENOMEM;
ret = hcall_get_cpu_state(cmd, virt_to_phys(px_data));
if (ret < 0) {
kfree(px_data);
break;
}
if (copy_to_user(uptr, px_data, sizeof(*px_data)))
ret = -EFAULT;
kfree(px_data);
break;
case ACRN_PMCMD_GET_CX_DATA:
cx_data = kmalloc(sizeof(*cx_data), GFP_KERNEL);
if (!cx_data)
return -ENOMEM;
ret = hcall_get_cpu_state(cmd, virt_to_phys(cx_data));
if (ret < 0) {
kfree(cx_data);
break;
}
if (copy_to_user(uptr, cx_data, sizeof(*cx_data)))
ret = -EFAULT;
kfree(cx_data);
break;
default:
break;
}
return ret;
}
/*
* HSM relies on hypercall layer of the ACRN hypervisor to do the
* sanity check against the input parameters.
@ -54,6 +115,7 @@ static long acrn_dev_ioctl(struct file *filp, unsigned int cmd,
struct acrn_msi_entry *msi;
struct acrn_pcidev *pcidev;
struct page *page;
u64 cstate_cmd;
int i, ret = 0;
if (vm->vmid == ACRN_INVALID_VMID && cmd != ACRN_IOCTL_CREATE_VM) {
@ -267,6 +329,13 @@ static long acrn_dev_ioctl(struct file *filp, unsigned int cmd,
case ACRN_IOCTL_CLEAR_VM_IOREQ:
acrn_ioreq_request_clear(vm);
break;
case ACRN_IOCTL_PM_GET_CPU_STATE:
if (copy_from_user(&cstate_cmd, (void *)ioctl_param,
sizeof(cstate_cmd)))
return -EFAULT;
ret = pmcmd_ioctl(cstate_cmd, (void __user *)ioctl_param);
break;
default:
dev_dbg(acrn_dev.this_device, "Unknown IOCTL 0x%x!\n", cmd);
ret = -ENOTTY;

12
drivers/virt/acrn/hypercall.h
View File

@ -39,6 +39,9 @@
#define HC_ASSIGN_PCIDEV _HC_ID(HC_ID, HC_ID_PCI_BASE + 0x05)
#define HC_DEASSIGN_PCIDEV _HC_ID(HC_ID, HC_ID_PCI_BASE + 0x06)
#define HC_ID_PM_BASE 0x80UL
#define HC_PM_GET_CPU_STATE _HC_ID(HC_ID, HC_ID_PM_BASE + 0x00)
/**
* hcall_create_vm() - Create a User VM
* @vminfo: Service VM GPA of info of User VM creation
@ -225,4 +228,13 @@ static inline long hcall_reset_ptdev_intr(u64 vmid, u64 irq)
return acrn_hypercall2(HC_RESET_PTDEV_INTR, vmid, irq);
}
/*
* hcall_get_cpu_state() - Get P-states and C-states info from the hypervisor
* @state: Service VM GPA of buffer of P-states and C-states
*/
static inline long hcall_get_cpu_state(u64 cmd, u64 state)
{
return acrn_hypercall2(HC_PM_GET_CPU_STATE, cmd, state);
}
#endif /* __ACRN_HSM_HYPERCALL_H */

55
include/uapi/linux/acrn.h
View File

@ -427,6 +427,58 @@ struct acrn_msi_entry {
__u64 msi_data;
};
struct acrn_acpi_generic_address {
__u8 space_id;
__u8 bit_width;
__u8 bit_offset;
__u8 access_size;
__u64 address;
} __attribute__ ((__packed__));
/**
* struct acrn_cstate_data - A C state package defined in ACPI
* @cx_reg: Register of the C state object
* @type: Type of the C state object
* @latency: The worst-case latency to enter and exit this C state
* @power: The average power consumption when in this C state
*/
struct acrn_cstate_data {
struct acrn_acpi_generic_address cx_reg;
__u8 type;
__u32 latency;
__u64 power;
};
/**
* struct acrn_pstate_data - A P state package defined in ACPI
* @core_frequency: CPU frequency (in MHz).
* @power: Power dissipation (in milliwatts).
* @transition_latency: The worst-case latency in microseconds that CPU is
* unavailable during a transition from any P state to
* this P state.
* @bus_master_latency: The worst-case latency in microseconds that Bus Masters
* are prevented from accessing memory during a transition
* from any P state to this P state.
* @control: The value to be written to Performance Control Register
* @status: Transition status.
*/
struct acrn_pstate_data {
__u64 core_frequency;
__u64 power;
__u64 transition_latency;
__u64 bus_master_latency;
__u64 control;
__u64 status;
};
#define PMCMD_TYPE_MASK 0x000000ff
enum acrn_pm_cmd_type {
ACRN_PMCMD_GET_PX_CNT,
ACRN_PMCMD_GET_PX_DATA,
ACRN_PMCMD_GET_CX_CNT,
ACRN_PMCMD_GET_CX_DATA,
};
/* The ioctl type, documented in ioctl-number.rst */
#define ACRN_IOCTL_TYPE 0xA2
@ -478,4 +530,7 @@ struct acrn_msi_entry {
#define ACRN_IOCTL_DEASSIGN_PCIDEV \
_IOW(ACRN_IOCTL_TYPE, 0x56, struct acrn_pcidev)
#define ACRN_IOCTL_PM_GET_CPU_STATE \
_IOWR(ACRN_IOCTL_TYPE, 0x60, __u64)
#endif /* _UAPI_ACRN_H */