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linux/include/linux/arm_ffa.h
Sudeep Holla aaef3bc981 firmware: arm_ffa: Add support for FFA_MSG_SEND_DIRECT_{REQ,RESP}2 
FFA_MSG_SEND_DIRECT_{REQ,RESP} supported only x3-x7 to pass implementation
defined values as part of the message. This may not be sufficient sometimes
and also it would be good to use all the registers supported by SMCCC v1.2
(x0-x17) for such register based communication.

Also another limitation with the FFA_MSG_SEND_DIRECT_{REQ,RESP} is the
ability to target a specific service within the partition based on it's
UUID.

In order to address both of the above limitation, FF-A v1.2 introduced
FFA_MSG_SEND_DIRECT_{REQ,RESP}2 which has the ability to target the
message to a specific service based on its UUID within a partition as
well as utilise all the available registers(x4-x17 specifically) for
the communication.

This change adds support for FFA_MSG_SEND_DIRECT_REQ2 and
FFA_MSG_SEND_DIRECT_RESP2.

Message-Id: <20240820-ffa_v1-2-v2-5-18c0c5f3c65e@arm.com>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
2024-08-20 15:40:44 +01:00

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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Copyright (C) 2021 ARM Ltd.
*/
#ifndef _LINUX_ARM_FFA_H
#define _LINUX_ARM_FFA_H
#include <linux/bitfield.h>
#include <linux/device.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/uuid.h>
#define FFA_SMC(calling_convention, func_num) \
ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, (calling_convention), \
ARM_SMCCC_OWNER_STANDARD, (func_num))
#define FFA_SMC_32(func_num) FFA_SMC(ARM_SMCCC_SMC_32, (func_num))
#define FFA_SMC_64(func_num) FFA_SMC(ARM_SMCCC_SMC_64, (func_num))
#define FFA_ERROR FFA_SMC_32(0x60)
#define FFA_SUCCESS FFA_SMC_32(0x61)
#define FFA_FN64_SUCCESS FFA_SMC_64(0x61)
#define FFA_INTERRUPT FFA_SMC_32(0x62)
#define FFA_VERSION FFA_SMC_32(0x63)
#define FFA_FEATURES FFA_SMC_32(0x64)
#define FFA_RX_RELEASE FFA_SMC_32(0x65)
#define FFA_RXTX_MAP FFA_SMC_32(0x66)
#define FFA_FN64_RXTX_MAP FFA_SMC_64(0x66)
#define FFA_RXTX_UNMAP FFA_SMC_32(0x67)
#define FFA_PARTITION_INFO_GET FFA_SMC_32(0x68)
#define FFA_ID_GET FFA_SMC_32(0x69)
#define FFA_MSG_POLL FFA_SMC_32(0x6A)
#define FFA_MSG_WAIT FFA_SMC_32(0x6B)
#define FFA_YIELD FFA_SMC_32(0x6C)
#define FFA_RUN FFA_SMC_32(0x6D)
#define FFA_MSG_SEND FFA_SMC_32(0x6E)
#define FFA_MSG_SEND_DIRECT_REQ FFA_SMC_32(0x6F)
#define FFA_FN64_MSG_SEND_DIRECT_REQ FFA_SMC_64(0x6F)
#define FFA_MSG_SEND_DIRECT_RESP FFA_SMC_32(0x70)
#define FFA_FN64_MSG_SEND_DIRECT_RESP FFA_SMC_64(0x70)
#define FFA_MEM_DONATE FFA_SMC_32(0x71)
#define FFA_FN64_MEM_DONATE FFA_SMC_64(0x71)
#define FFA_MEM_LEND FFA_SMC_32(0x72)
#define FFA_FN64_MEM_LEND FFA_SMC_64(0x72)
#define FFA_MEM_SHARE FFA_SMC_32(0x73)
#define FFA_FN64_MEM_SHARE FFA_SMC_64(0x73)
#define FFA_MEM_RETRIEVE_REQ FFA_SMC_32(0x74)
#define FFA_FN64_MEM_RETRIEVE_REQ FFA_SMC_64(0x74)
#define FFA_MEM_RETRIEVE_RESP FFA_SMC_32(0x75)
#define FFA_MEM_RELINQUISH FFA_SMC_32(0x76)
#define FFA_MEM_RECLAIM FFA_SMC_32(0x77)
#define FFA_MEM_OP_PAUSE FFA_SMC_32(0x78)
#define FFA_MEM_OP_RESUME FFA_SMC_32(0x79)
#define FFA_MEM_FRAG_RX FFA_SMC_32(0x7A)
#define FFA_MEM_FRAG_TX FFA_SMC_32(0x7B)
#define FFA_NORMAL_WORLD_RESUME FFA_SMC_32(0x7C)
#define FFA_NOTIFICATION_BITMAP_CREATE FFA_SMC_32(0x7D)
#define FFA_NOTIFICATION_BITMAP_DESTROY FFA_SMC_32(0x7E)
#define FFA_NOTIFICATION_BIND FFA_SMC_32(0x7F)
#define FFA_NOTIFICATION_UNBIND FFA_SMC_32(0x80)
#define FFA_NOTIFICATION_SET FFA_SMC_32(0x81)
#define FFA_NOTIFICATION_GET FFA_SMC_32(0x82)
#define FFA_NOTIFICATION_INFO_GET FFA_SMC_32(0x83)
#define FFA_FN64_NOTIFICATION_INFO_GET FFA_SMC_64(0x83)
#define FFA_RX_ACQUIRE FFA_SMC_32(0x84)
#define FFA_SPM_ID_GET FFA_SMC_32(0x85)
#define FFA_MSG_SEND2 FFA_SMC_32(0x86)
#define FFA_SECONDARY_EP_REGISTER FFA_SMC_32(0x87)
#define FFA_FN64_SECONDARY_EP_REGISTER FFA_SMC_64(0x87)
#define FFA_MEM_PERM_GET FFA_SMC_32(0x88)
#define FFA_FN64_MEM_PERM_GET FFA_SMC_64(0x88)
#define FFA_MEM_PERM_SET FFA_SMC_32(0x89)
#define FFA_FN64_MEM_PERM_SET FFA_SMC_64(0x89)
#define FFA_CONSOLE_LOG FFA_SMC_32(0x8A)
#define FFA_PARTITION_INFO_GET_REGS FFA_SMC_64(0x8B)
#define FFA_EL3_INTR_HANDLE FFA_SMC_32(0x8C)
#define FFA_MSG_SEND_DIRECT_REQ2 FFA_SMC_64(0x8D)
#define FFA_MSG_SEND_DIRECT_RESP2 FFA_SMC_64(0x8E)
/*
* For some calls it is necessary to use SMC64 to pass or return 64-bit values.
* For such calls FFA_FN_NATIVE(name) will choose the appropriate
* (native-width) function ID.
*/
#ifdef CONFIG_64BIT
#define FFA_FN_NATIVE(name) FFA_FN64_##name
#else
#define FFA_FN_NATIVE(name) FFA_##name
#endif
/* FFA error codes. */
#define FFA_RET_SUCCESS (0)
#define FFA_RET_NOT_SUPPORTED (-1)
#define FFA_RET_INVALID_PARAMETERS (-2)
#define FFA_RET_NO_MEMORY (-3)
#define FFA_RET_BUSY (-4)
#define FFA_RET_INTERRUPTED (-5)
#define FFA_RET_DENIED (-6)
#define FFA_RET_RETRY (-7)
#define FFA_RET_ABORTED (-8)
#define FFA_RET_NO_DATA (-9)
/* FFA version encoding */
#define FFA_MAJOR_VERSION_MASK GENMASK(30, 16)
#define FFA_MINOR_VERSION_MASK GENMASK(15, 0)
#define FFA_MAJOR_VERSION(x) ((u16)(FIELD_GET(FFA_MAJOR_VERSION_MASK, (x))))
#define FFA_MINOR_VERSION(x) ((u16)(FIELD_GET(FFA_MINOR_VERSION_MASK, (x))))
#define FFA_PACK_VERSION_INFO(major, minor) \
(FIELD_PREP(FFA_MAJOR_VERSION_MASK, (major)) | \
FIELD_PREP(FFA_MINOR_VERSION_MASK, (minor)))
#define FFA_VERSION_1_0 FFA_PACK_VERSION_INFO(1, 0)
#define FFA_VERSION_1_1 FFA_PACK_VERSION_INFO(1, 1)
/**
* FF-A specification mentions explicitly about '4K pages'. This should
* not be confused with the kernel PAGE_SIZE, which is the translation
* granule kernel is configured and may be one among 4K, 16K and 64K.
*/
#define FFA_PAGE_SIZE SZ_4K
/*
* Minimum buffer size/alignment encodings returned by an FFA_FEATURES
* query for FFA_RXTX_MAP.
*/
#define FFA_FEAT_RXTX_MIN_SZ_4K 0
#define FFA_FEAT_RXTX_MIN_SZ_64K 1
#define FFA_FEAT_RXTX_MIN_SZ_16K 2
/* FFA Bus/Device/Driver related */
struct ffa_device {
u32 id;
u32 properties;
int vm_id;
bool mode_32bit;
uuid_t uuid;
struct device dev;
const struct ffa_ops *ops;
};
#define to_ffa_dev(d) container_of(d, struct ffa_device, dev)
struct ffa_device_id {
uuid_t uuid;
};
struct ffa_driver {
const char *name;
int (*probe)(struct ffa_device *sdev);
void (*remove)(struct ffa_device *sdev);
const struct ffa_device_id *id_table;
struct device_driver driver;
};
#define to_ffa_driver(d) container_of_const(d, struct ffa_driver, driver)
static inline void ffa_dev_set_drvdata(struct ffa_device *fdev, void *data)
{
dev_set_drvdata(&fdev->dev, data);
}
static inline void *ffa_dev_get_drvdata(struct ffa_device *fdev)
{
return dev_get_drvdata(&fdev->dev);
}
#if IS_REACHABLE(CONFIG_ARM_FFA_TRANSPORT)
struct ffa_device *ffa_device_register(const uuid_t *uuid, int vm_id,
const struct ffa_ops *ops);
void ffa_device_unregister(struct ffa_device *ffa_dev);
int ffa_driver_register(struct ffa_driver *driver, struct module *owner,
const char *mod_name);
void ffa_driver_unregister(struct ffa_driver *driver);
bool ffa_device_is_valid(struct ffa_device *ffa_dev);
#else
static inline
struct ffa_device *ffa_device_register(const uuid_t *uuid, int vm_id,
const struct ffa_ops *ops)
{
return NULL;
}
static inline void ffa_device_unregister(struct ffa_device *dev) {}
static inline int
ffa_driver_register(struct ffa_driver *driver, struct module *owner,
const char *mod_name)
{
return -EINVAL;
}
static inline void ffa_driver_unregister(struct ffa_driver *driver) {}
static inline
bool ffa_device_is_valid(struct ffa_device *ffa_dev) { return false; }
#endif /* CONFIG_ARM_FFA_TRANSPORT */
#define ffa_register(driver) \
ffa_driver_register(driver, THIS_MODULE, KBUILD_MODNAME)
#define ffa_unregister(driver) \
ffa_driver_unregister(driver)
/**
* module_ffa_driver() - Helper macro for registering a psa_ffa driver
* @__ffa_driver: ffa_driver structure
*
* Helper macro for psa_ffa drivers to set up proper module init / exit
* functions. Replaces module_init() and module_exit() and keeps people from
* printing pointless things to the kernel log when their driver is loaded.
*/
#define module_ffa_driver(__ffa_driver) \
module_driver(__ffa_driver, ffa_register, ffa_unregister)
extern const struct bus_type ffa_bus_type;
/* The FF-A 1.0 partition structure lacks the uuid[4] */
#define FFA_1_0_PARTITON_INFO_SZ (8)
/* FFA transport related */
struct ffa_partition_info {
u16 id;
u16 exec_ctxt;
/* partition supports receipt of direct requests */
#define FFA_PARTITION_DIRECT_RECV BIT(0)
/* partition can send direct requests. */
#define FFA_PARTITION_DIRECT_SEND BIT(1)
/* partition can send and receive indirect messages. */
#define FFA_PARTITION_INDIRECT_MSG BIT(2)
/* partition can receive notifications */
#define FFA_PARTITION_NOTIFICATION_RECV BIT(3)
/* partition runs in the AArch64 execution state. */
#define FFA_PARTITION_AARCH64_EXEC BIT(8)
u32 properties;
u32 uuid[4];
};
static inline
bool ffa_partition_check_property(struct ffa_device *dev, u32 property)
{
return dev->properties & property;
}
#define ffa_partition_supports_notify_recv(dev) \
ffa_partition_check_property(dev, FFA_PARTITION_NOTIFICATION_RECV)
#define ffa_partition_supports_indirect_msg(dev) \
ffa_partition_check_property(dev, FFA_PARTITION_INDIRECT_MSG)
#define ffa_partition_supports_direct_recv(dev) \
ffa_partition_check_property(dev, FFA_PARTITION_DIRECT_RECV)
/* For use with FFA_MSG_SEND_DIRECT_{REQ,RESP} which pass data via registers */
struct ffa_send_direct_data {
unsigned long data0; /* w3/x3 */
unsigned long data1; /* w4/x4 */
unsigned long data2; /* w5/x5 */
unsigned long data3; /* w6/x6 */
unsigned long data4; /* w7/x7 */
};
struct ffa_indirect_msg_hdr {
u32 flags;
u32 res0;
u32 offset;
u32 send_recv_id;
u32 size;
};
/* For use with FFA_MSG_SEND_DIRECT_{REQ,RESP}2 which pass data via registers */
struct ffa_send_direct_data2 {
unsigned long data[14]; /* x4-x17 */
};
struct ffa_mem_region_addr_range {
/* The base IPA of the constituent memory region, aligned to 4 kiB */
u64 address;
/* The number of 4 kiB pages in the constituent memory region. */
u32 pg_cnt;
u32 reserved;
};
struct ffa_composite_mem_region {
/*
* The total number of 4 kiB pages included in this memory region. This
* must be equal to the sum of page counts specified in each
* `struct ffa_mem_region_addr_range`.
*/
u32 total_pg_cnt;
/* The number of constituents included in this memory region range */
u32 addr_range_cnt;
u64 reserved;
/** An array of `addr_range_cnt` memory region constituents. */
struct ffa_mem_region_addr_range constituents[];
};
struct ffa_mem_region_attributes {
/* The ID of the VM to which the memory is being given or shared. */
u16 receiver;
/*
* The permissions with which the memory region should be mapped in the
* receiver's page table.
*/
#define FFA_MEM_EXEC BIT(3)
#define FFA_MEM_NO_EXEC BIT(2)
#define FFA_MEM_RW BIT(1)
#define FFA_MEM_RO BIT(0)
u8 attrs;
/*
* Flags used during FFA_MEM_RETRIEVE_REQ and FFA_MEM_RETRIEVE_RESP
* for memory regions with multiple borrowers.
*/
#define FFA_MEM_RETRIEVE_SELF_BORROWER BIT(0)
u8 flag;
/*
* Offset in bytes from the start of the outer `ffa_memory_region` to
* an `struct ffa_mem_region_addr_range`.
*/
u32 composite_off;
u64 reserved;
};
struct ffa_mem_region {
/* The ID of the VM/owner which originally sent the memory region */
u16 sender_id;
#define FFA_MEM_NORMAL BIT(5)
#define FFA_MEM_DEVICE BIT(4)
#define FFA_MEM_WRITE_BACK (3 << 2)
#define FFA_MEM_NON_CACHEABLE (1 << 2)
#define FFA_DEV_nGnRnE (0 << 2)
#define FFA_DEV_nGnRE (1 << 2)
#define FFA_DEV_nGRE (2 << 2)
#define FFA_DEV_GRE (3 << 2)
#define FFA_MEM_NON_SHAREABLE (0)
#define FFA_MEM_OUTER_SHAREABLE (2)
#define FFA_MEM_INNER_SHAREABLE (3)
/* Memory region attributes, upper byte MBZ pre v1.1 */
u16 attributes;
/*
* Clear memory region contents after unmapping it from the sender and
* before mapping it for any receiver.
*/
#define FFA_MEM_CLEAR BIT(0)
/*
* Whether the hypervisor may time slice the memory sharing or retrieval
* operation.
*/
#define FFA_TIME_SLICE_ENABLE BIT(1)
#define FFA_MEM_RETRIEVE_TYPE_IN_RESP (0 << 3)
#define FFA_MEM_RETRIEVE_TYPE_SHARE (1 << 3)
#define FFA_MEM_RETRIEVE_TYPE_LEND (2 << 3)
#define FFA_MEM_RETRIEVE_TYPE_DONATE (3 << 3)
#define FFA_MEM_RETRIEVE_ADDR_ALIGN_HINT BIT(9)
#define FFA_MEM_RETRIEVE_ADDR_ALIGN(x) ((x) << 5)
/* Flags to control behaviour of the transaction. */
u32 flags;
#define HANDLE_LOW_MASK GENMASK_ULL(31, 0)
#define HANDLE_HIGH_MASK GENMASK_ULL(63, 32)
#define HANDLE_LOW(x) ((u32)(FIELD_GET(HANDLE_LOW_MASK, (x))))
#define HANDLE_HIGH(x) ((u32)(FIELD_GET(HANDLE_HIGH_MASK, (x))))
#define PACK_HANDLE(l, h) \
(FIELD_PREP(HANDLE_LOW_MASK, (l)) | FIELD_PREP(HANDLE_HIGH_MASK, (h)))
/*
* A globally-unique ID assigned by the hypervisor for a region
* of memory being sent between VMs.
*/
u64 handle;
/*
* An implementation defined value associated with the receiver and the
* memory region.
*/
u64 tag;
/* Size of each endpoint memory access descriptor, MBZ pre v1.1 */
u32 ep_mem_size;
/*
* The number of `ffa_mem_region_attributes` entries included in this
* transaction.
*/
u32 ep_count;
/*
* 16-byte aligned offset from the base address of this descriptor
* to the first element of the endpoint memory access descriptor array
* Valid only from v1.1
*/
u32 ep_mem_offset;
/* MBZ, valid only from v1.1 */
u32 reserved[3];
};
#define CONSTITUENTS_OFFSET(x) \
(offsetof(struct ffa_composite_mem_region, constituents[x]))
static inline u32
ffa_mem_desc_offset(struct ffa_mem_region *buf, int count, u32 ffa_version)
{
u32 offset = count * sizeof(struct ffa_mem_region_attributes);
/*
* Earlier to v1.1, the endpoint memory descriptor array started at
* offset 32(i.e. offset of ep_mem_offset in the current structure)
*/
if (ffa_version <= FFA_VERSION_1_0)
offset += offsetof(struct ffa_mem_region, ep_mem_offset);
else
offset += sizeof(struct ffa_mem_region);
return offset;
}
struct ffa_mem_ops_args {
bool use_txbuf;
u32 nattrs;
u32 flags;
u64 tag;
u64 g_handle;
struct scatterlist *sg;
struct ffa_mem_region_attributes *attrs;
};
struct ffa_info_ops {
u32 (*api_version_get)(void);
int (*partition_info_get)(const char *uuid_str,
struct ffa_partition_info *buffer);
};
struct ffa_msg_ops {
void (*mode_32bit_set)(struct ffa_device *dev);
int (*sync_send_receive)(struct ffa_device *dev,
struct ffa_send_direct_data *data);
int (*indirect_send)(struct ffa_device *dev, void *buf, size_t sz);
int (*sync_send_receive2)(struct ffa_device *dev, const uuid_t *uuid,
struct ffa_send_direct_data2 *data);
};
struct ffa_mem_ops {
int (*memory_reclaim)(u64 g_handle, u32 flags);
int (*memory_share)(struct ffa_mem_ops_args *args);
int (*memory_lend)(struct ffa_mem_ops_args *args);
};
struct ffa_cpu_ops {
int (*run)(struct ffa_device *dev, u16 vcpu);
};
typedef void (*ffa_sched_recv_cb)(u16 vcpu, bool is_per_vcpu, void *cb_data);
typedef void (*ffa_notifier_cb)(int notify_id, void *cb_data);
struct ffa_notifier_ops {
int (*sched_recv_cb_register)(struct ffa_device *dev,
ffa_sched_recv_cb cb, void *cb_data);
int (*sched_recv_cb_unregister)(struct ffa_device *dev);
int (*notify_request)(struct ffa_device *dev, bool per_vcpu,
ffa_notifier_cb cb, void *cb_data, int notify_id);
int (*notify_relinquish)(struct ffa_device *dev, int notify_id);
int (*notify_send)(struct ffa_device *dev, int notify_id, bool per_vcpu,
u16 vcpu);
};
struct ffa_ops {
const struct ffa_info_ops *info_ops;
const struct ffa_msg_ops *msg_ops;
const struct ffa_mem_ops *mem_ops;
const struct ffa_cpu_ops *cpu_ops;
const struct ffa_notifier_ops *notifier_ops;
};
#endif /* _LINUX_ARM_FFA_H */
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