arch/powerpc/platforms/pseries/vas.h

Source file repositories/reference/linux-study-clean/arch/powerpc/platforms/pseries/vas.h

File Facts

System
Linux kernel
Corpus path
arch/powerpc/platforms/pseries/vas.h
Extension
.h
Size
4309 bytes
Lines
158
Domain
Architecture Layer
Bucket
arch/powerpc
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

struct hv_vas_cop_feat_caps {
	__be64	descriptor;
	u8	win_type;		/* Default or QoS type */
	u8	user_mode;
	__be16	max_lpar_creds;
	__be16	max_win_creds;
	union {
		__be16	reserved;
		__be16	def_lpar_creds; /* Used for default capabilities */
	};
	__be16	target_lpar_creds;
} __packed __aligned(0x1000);

/*
 * Feature specific (QoS or default) capabilities.
 */
struct vas_cop_feat_caps {
	u64		descriptor;
	u8		win_type;	/* Default or QoS type */
	u8		user_mode;	/* User mode copy/paste or COP HCALL */
	u16		max_lpar_creds;	/* Max credits available in LPAR */
	/* Max credits can be assigned per window */
	u16		max_win_creds;
	union {
		u16	reserved;	/* Used for QoS credit type */
		u16	def_lpar_creds; /* Used for default credit type */
	};
	/* Total LPAR available credits. Can be different from max LPAR */
	/* credits due to DLPAR operation */
	atomic_t	nr_total_credits;	/* Total credits assigned to LPAR */
	atomic_t	nr_used_credits;	/* Used credits so far */
};

/*
 * Feature (QoS or Default) specific to store capabilities and
 * the list of open windows.
 */
struct vas_caps {
	struct vas_cop_feat_caps caps;
	struct list_head list;	/* List of open windows */
	int nr_open_wins_progress;	/* Number of open windows in */
					/* progress. Used in migration */
	int nr_close_wins;	/* closed windows in the hypervisor for DLPAR */
	int nr_open_windows;	/* Number of successful open windows */
	u8 feat;		/* Feature type */
};

/*
 * To get window information from the hypervisor.
 */
struct hv_vas_win_lpar {
	__be16	version;
	u8	win_type;
	u8	status;
	__be16	credits;	/* No of credits assigned to this window */
	__be16	reserved;
	__be32	pid;		/* LPAR Process ID */
	__be32	tid;		/* LPAR Thread ID */
	__be64	win_addr;	/* Paste address */
	__be32	interrupt;	/* Interrupt when NX request completes */
	__be32	fault;		/* Interrupt when NX sees fault */
	/* Associativity Domain Identifiers as returned in */
	/* H_HOME_NODE_ASSOCIATIVITY */
	__be64	domain[6];
	__be64	win_util;	/* Number of bytes processed */
} __packed __aligned(0x1000);

struct pseries_vas_window {
	struct vas_window vas_win;
	u64 win_addr;		/* Physical paste address */
	u8 win_type;		/* QoS or Default window */
	u32 complete_irq;	/* Completion interrupt */
	u32 fault_irq;		/* Fault interrupt */
	u64 domain[6];		/* Associativity domain Ids */
				/* this window is allocated */
	u64 util;
	u32 pid;		/* PID associated with this window */

	/* List of windows opened which is used for LPM */
	struct list_head win_list;
	u64 flags;
	char *name;
	int fault_virq;
	atomic_t pending_faults; /* Number of pending faults */
};

int sysfs_add_vas_caps(struct vas_cop_feat_caps *caps);
int vas_reconfig_capabilties(u8 type, int new_nr_creds);
int __init sysfs_pseries_vas_init(struct vas_all_caps *vas_caps);

Annotation

Implementation Notes