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-rw-r--r--arch/powerpc/platforms/pseries/vas.h155
1 files changed, 155 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/pseries/vas.h b/arch/powerpc/platforms/pseries/vas.h
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+++ b/arch/powerpc/platforms/pseries/vas.h
@@ -0,0 +1,155 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright 2020-21 IBM Corp.
+ */
+
+#ifndef _VAS_H
+#define _VAS_H
+#include <asm/vas.h>
+#include <linux/mutex.h>
+#include <linux/stringify.h>
+
+/*
+ * VAS window modify flags
+ */
+#define VAS_MOD_WIN_CLOSE PPC_BIT(0)
+#define VAS_MOD_WIN_JOBS_KILL PPC_BIT(1)
+#define VAS_MOD_WIN_DR PPC_BIT(3)
+#define VAS_MOD_WIN_PR PPC_BIT(4)
+#define VAS_MOD_WIN_SF PPC_BIT(5)
+#define VAS_MOD_WIN_TA PPC_BIT(6)
+#define VAS_MOD_WIN_FLAGS (VAS_MOD_WIN_JOBS_KILL | VAS_MOD_WIN_DR | \
+ VAS_MOD_WIN_PR | VAS_MOD_WIN_SF)
+
+#define VAS_WIN_ACTIVE 0x0
+#define VAS_WIN_CLOSED 0x1
+#define VAS_WIN_INACTIVE 0x2 /* Inactive due to HW failure */
+/* Process of being modified, deallocated, or quiesced */
+#define VAS_WIN_MOD_IN_PROCESS 0x3
+
+#define VAS_COPY_PASTE_USER_MODE 0x00000001
+#define VAS_COP_OP_USER_MODE 0x00000010
+
+#define VAS_GZIP_QOS_CAPABILITIES 0x56516F73477A6970
+#define VAS_GZIP_DEFAULT_CAPABILITIES 0x56446566477A6970
+
+enum vas_migrate_action {
+ VAS_SUSPEND,
+ VAS_RESUME,
+};
+
+/*
+ * Co-processor feature - GZIP QoS windows or GZIP default windows
+ */
+enum vas_cop_feat_type {
+ VAS_GZIP_QOS_FEAT_TYPE,
+ VAS_GZIP_DEF_FEAT_TYPE,
+ VAS_MAX_FEAT_TYPE,
+};
+
+/*
+ * Use to get feature specific capabilities from the
+ * hypervisor.
+ */
+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_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);
+
+#ifdef CONFIG_PPC_VAS
+int vas_migration_handler(int action);
+int pseries_vas_dlpar_cpu(void);
+#else
+static inline int vas_migration_handler(int action)
+{
+ return 0;
+}
+static inline int pseries_vas_dlpar_cpu(void)
+{
+ return 0;
+}
+#endif
+#endif /* _VAS_H */