775 lines
20 KiB
C
775 lines
20 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Arm Firmware Framework for ARMv8-A(FFA) interface driver
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*
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* The Arm FFA specification[1] describes a software architecture to
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* leverages the virtualization extension to isolate software images
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* provided by an ecosystem of vendors from each other and describes
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* interfaces that standardize communication between the various software
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* images including communication between images in the Secure world and
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* Normal world. Any Hypervisor could use the FFA interfaces to enable
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* communication between VMs it manages.
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*
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* The Hypervisor a.k.a Partition managers in FFA terminology can assign
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* system resources(Memory regions, Devices, CPU cycles) to the partitions
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* and manage isolation amongst them.
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*
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* [1] https://developer.arm.com/docs/den0077/latest
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*
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* Copyright (C) 2021 ARM Ltd.
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*/
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#define DRIVER_NAME "ARM FF-A"
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#define pr_fmt(fmt) DRIVER_NAME ": " fmt
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#include <linux/arm_ffa.h>
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#include <linux/bitfield.h>
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#include <linux/device.h>
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#include <linux/io.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/mm.h>
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#include <linux/scatterlist.h>
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#include <linux/slab.h>
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#include <linux/uuid.h>
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#include "common.h"
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#define FFA_DRIVER_VERSION FFA_VERSION_1_0
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#define FFA_SMC(calling_convention, func_num) \
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ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, (calling_convention), \
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ARM_SMCCC_OWNER_STANDARD, (func_num))
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#define FFA_SMC_32(func_num) FFA_SMC(ARM_SMCCC_SMC_32, (func_num))
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#define FFA_SMC_64(func_num) FFA_SMC(ARM_SMCCC_SMC_64, (func_num))
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#define FFA_ERROR FFA_SMC_32(0x60)
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#define FFA_SUCCESS FFA_SMC_32(0x61)
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#define FFA_INTERRUPT FFA_SMC_32(0x62)
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#define FFA_VERSION FFA_SMC_32(0x63)
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#define FFA_FEATURES FFA_SMC_32(0x64)
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#define FFA_RX_RELEASE FFA_SMC_32(0x65)
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#define FFA_RXTX_MAP FFA_SMC_32(0x66)
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#define FFA_FN64_RXTX_MAP FFA_SMC_64(0x66)
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#define FFA_RXTX_UNMAP FFA_SMC_32(0x67)
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#define FFA_PARTITION_INFO_GET FFA_SMC_32(0x68)
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#define FFA_ID_GET FFA_SMC_32(0x69)
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#define FFA_MSG_POLL FFA_SMC_32(0x6A)
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#define FFA_MSG_WAIT FFA_SMC_32(0x6B)
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#define FFA_YIELD FFA_SMC_32(0x6C)
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#define FFA_RUN FFA_SMC_32(0x6D)
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#define FFA_MSG_SEND FFA_SMC_32(0x6E)
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#define FFA_MSG_SEND_DIRECT_REQ FFA_SMC_32(0x6F)
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#define FFA_FN64_MSG_SEND_DIRECT_REQ FFA_SMC_64(0x6F)
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#define FFA_MSG_SEND_DIRECT_RESP FFA_SMC_32(0x70)
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#define FFA_FN64_MSG_SEND_DIRECT_RESP FFA_SMC_64(0x70)
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#define FFA_MEM_DONATE FFA_SMC_32(0x71)
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#define FFA_FN64_MEM_DONATE FFA_SMC_64(0x71)
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#define FFA_MEM_LEND FFA_SMC_32(0x72)
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#define FFA_FN64_MEM_LEND FFA_SMC_64(0x72)
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#define FFA_MEM_SHARE FFA_SMC_32(0x73)
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#define FFA_FN64_MEM_SHARE FFA_SMC_64(0x73)
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#define FFA_MEM_RETRIEVE_REQ FFA_SMC_32(0x74)
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#define FFA_FN64_MEM_RETRIEVE_REQ FFA_SMC_64(0x74)
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#define FFA_MEM_RETRIEVE_RESP FFA_SMC_32(0x75)
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#define FFA_MEM_RELINQUISH FFA_SMC_32(0x76)
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#define FFA_MEM_RECLAIM FFA_SMC_32(0x77)
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#define FFA_MEM_OP_PAUSE FFA_SMC_32(0x78)
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#define FFA_MEM_OP_RESUME FFA_SMC_32(0x79)
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#define FFA_MEM_FRAG_RX FFA_SMC_32(0x7A)
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#define FFA_MEM_FRAG_TX FFA_SMC_32(0x7B)
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#define FFA_NORMAL_WORLD_RESUME FFA_SMC_32(0x7C)
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/*
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* For some calls it is necessary to use SMC64 to pass or return 64-bit values.
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* For such calls FFA_FN_NATIVE(name) will choose the appropriate
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* (native-width) function ID.
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*/
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#ifdef CONFIG_64BIT
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#define FFA_FN_NATIVE(name) FFA_FN64_##name
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#else
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#define FFA_FN_NATIVE(name) FFA_##name
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#endif
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/* FFA error codes. */
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#define FFA_RET_SUCCESS (0)
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#define FFA_RET_NOT_SUPPORTED (-1)
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#define FFA_RET_INVALID_PARAMETERS (-2)
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#define FFA_RET_NO_MEMORY (-3)
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#define FFA_RET_BUSY (-4)
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#define FFA_RET_INTERRUPTED (-5)
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#define FFA_RET_DENIED (-6)
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#define FFA_RET_RETRY (-7)
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#define FFA_RET_ABORTED (-8)
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#define MAJOR_VERSION_MASK GENMASK(30, 16)
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#define MINOR_VERSION_MASK GENMASK(15, 0)
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#define MAJOR_VERSION(x) ((u16)(FIELD_GET(MAJOR_VERSION_MASK, (x))))
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#define MINOR_VERSION(x) ((u16)(FIELD_GET(MINOR_VERSION_MASK, (x))))
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#define PACK_VERSION_INFO(major, minor) \
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(FIELD_PREP(MAJOR_VERSION_MASK, (major)) | \
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FIELD_PREP(MINOR_VERSION_MASK, (minor)))
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#define FFA_VERSION_1_0 PACK_VERSION_INFO(1, 0)
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#define FFA_MIN_VERSION FFA_VERSION_1_0
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#define SENDER_ID_MASK GENMASK(31, 16)
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#define RECEIVER_ID_MASK GENMASK(15, 0)
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#define SENDER_ID(x) ((u16)(FIELD_GET(SENDER_ID_MASK, (x))))
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#define RECEIVER_ID(x) ((u16)(FIELD_GET(RECEIVER_ID_MASK, (x))))
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#define PACK_TARGET_INFO(s, r) \
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(FIELD_PREP(SENDER_ID_MASK, (s)) | FIELD_PREP(RECEIVER_ID_MASK, (r)))
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/*
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* FF-A specification mentions explicitly about '4K pages'. This should
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* not be confused with the kernel PAGE_SIZE, which is the translation
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* granule kernel is configured and may be one among 4K, 16K and 64K.
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*/
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#define FFA_PAGE_SIZE SZ_4K
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/*
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* Keeping RX TX buffer size as 4K for now
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* 64K may be preferred to keep it min a page in 64K PAGE_SIZE config
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*/
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#define RXTX_BUFFER_SIZE SZ_4K
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static ffa_fn *invoke_ffa_fn;
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static const int ffa_linux_errmap[] = {
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/* better than switch case as long as return value is continuous */
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0, /* FFA_RET_SUCCESS */
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-EOPNOTSUPP, /* FFA_RET_NOT_SUPPORTED */
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-EINVAL, /* FFA_RET_INVALID_PARAMETERS */
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-ENOMEM, /* FFA_RET_NO_MEMORY */
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-EBUSY, /* FFA_RET_BUSY */
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-EINTR, /* FFA_RET_INTERRUPTED */
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-EACCES, /* FFA_RET_DENIED */
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-EAGAIN, /* FFA_RET_RETRY */
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-ECANCELED, /* FFA_RET_ABORTED */
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};
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static inline int ffa_to_linux_errno(int errno)
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{
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int err_idx = -errno;
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if (err_idx >= 0 && err_idx < ARRAY_SIZE(ffa_linux_errmap))
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return ffa_linux_errmap[err_idx];
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return -EINVAL;
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}
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struct ffa_drv_info {
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u32 version;
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u16 vm_id;
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struct mutex rx_lock; /* lock to protect Rx buffer */
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struct mutex tx_lock; /* lock to protect Tx buffer */
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void *rx_buffer;
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void *tx_buffer;
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};
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static struct ffa_drv_info *drv_info;
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/*
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* The driver must be able to support all the versions from the earliest
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* supported FFA_MIN_VERSION to the latest supported FFA_DRIVER_VERSION.
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* The specification states that if firmware supports a FFA implementation
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* that is incompatible with and at a greater version number than specified
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* by the caller(FFA_DRIVER_VERSION passed as parameter to FFA_VERSION),
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* it must return the NOT_SUPPORTED error code.
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*/
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static u32 ffa_compatible_version_find(u32 version)
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{
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u16 major = MAJOR_VERSION(version), minor = MINOR_VERSION(version);
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u16 drv_major = MAJOR_VERSION(FFA_DRIVER_VERSION);
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u16 drv_minor = MINOR_VERSION(FFA_DRIVER_VERSION);
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if ((major < drv_major) || (major == drv_major && minor <= drv_minor))
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return version;
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pr_info("Firmware version higher than driver version, downgrading\n");
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return FFA_DRIVER_VERSION;
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}
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static int ffa_version_check(u32 *version)
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{
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ffa_value_t ver;
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invoke_ffa_fn((ffa_value_t){
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.a0 = FFA_VERSION, .a1 = FFA_DRIVER_VERSION,
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}, &ver);
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if (ver.a0 == FFA_RET_NOT_SUPPORTED) {
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pr_info("FFA_VERSION returned not supported\n");
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return -EOPNOTSUPP;
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}
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if (ver.a0 < FFA_MIN_VERSION) {
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pr_err("Incompatible v%d.%d! Earliest supported v%d.%d\n",
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MAJOR_VERSION(ver.a0), MINOR_VERSION(ver.a0),
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MAJOR_VERSION(FFA_MIN_VERSION),
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MINOR_VERSION(FFA_MIN_VERSION));
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return -EINVAL;
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}
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pr_info("Driver version %d.%d\n", MAJOR_VERSION(FFA_DRIVER_VERSION),
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MINOR_VERSION(FFA_DRIVER_VERSION));
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pr_info("Firmware version %d.%d found\n", MAJOR_VERSION(ver.a0),
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MINOR_VERSION(ver.a0));
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*version = ffa_compatible_version_find(ver.a0);
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return 0;
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}
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static int ffa_rx_release(void)
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{
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ffa_value_t ret;
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invoke_ffa_fn((ffa_value_t){
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.a0 = FFA_RX_RELEASE,
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}, &ret);
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if (ret.a0 == FFA_ERROR)
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return ffa_to_linux_errno((int)ret.a2);
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/* check for ret.a0 == FFA_RX_RELEASE ? */
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return 0;
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}
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static int ffa_rxtx_map(phys_addr_t tx_buf, phys_addr_t rx_buf, u32 pg_cnt)
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{
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ffa_value_t ret;
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invoke_ffa_fn((ffa_value_t){
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.a0 = FFA_FN_NATIVE(RXTX_MAP),
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.a1 = tx_buf, .a2 = rx_buf, .a3 = pg_cnt,
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}, &ret);
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if (ret.a0 == FFA_ERROR)
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return ffa_to_linux_errno((int)ret.a2);
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return 0;
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}
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static int ffa_rxtx_unmap(u16 vm_id)
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{
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ffa_value_t ret;
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invoke_ffa_fn((ffa_value_t){
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.a0 = FFA_RXTX_UNMAP, .a1 = PACK_TARGET_INFO(vm_id, 0),
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}, &ret);
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if (ret.a0 == FFA_ERROR)
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return ffa_to_linux_errno((int)ret.a2);
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return 0;
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}
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/* buffer must be sizeof(struct ffa_partition_info) * num_partitions */
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static int
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__ffa_partition_info_get(u32 uuid0, u32 uuid1, u32 uuid2, u32 uuid3,
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struct ffa_partition_info *buffer, int num_partitions)
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{
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int count;
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ffa_value_t partition_info;
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mutex_lock(&drv_info->rx_lock);
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invoke_ffa_fn((ffa_value_t){
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.a0 = FFA_PARTITION_INFO_GET,
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.a1 = uuid0, .a2 = uuid1, .a3 = uuid2, .a4 = uuid3,
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}, &partition_info);
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if (partition_info.a0 == FFA_ERROR) {
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mutex_unlock(&drv_info->rx_lock);
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return ffa_to_linux_errno((int)partition_info.a2);
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}
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count = partition_info.a2;
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if (buffer && count <= num_partitions)
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memcpy(buffer, drv_info->rx_buffer, sizeof(*buffer) * count);
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ffa_rx_release();
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mutex_unlock(&drv_info->rx_lock);
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return count;
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}
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/* buffer is allocated and caller must free the same if returned count > 0 */
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static int
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ffa_partition_probe(const uuid_t *uuid, struct ffa_partition_info **buffer)
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{
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int count;
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u32 uuid0_4[4];
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struct ffa_partition_info *pbuf;
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export_uuid((u8 *)uuid0_4, uuid);
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count = __ffa_partition_info_get(uuid0_4[0], uuid0_4[1], uuid0_4[2],
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uuid0_4[3], NULL, 0);
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if (count <= 0)
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return count;
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pbuf = kcalloc(count, sizeof(*pbuf), GFP_KERNEL);
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if (!pbuf)
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return -ENOMEM;
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count = __ffa_partition_info_get(uuid0_4[0], uuid0_4[1], uuid0_4[2],
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uuid0_4[3], pbuf, count);
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if (count <= 0)
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kfree(pbuf);
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else
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*buffer = pbuf;
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return count;
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}
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#define VM_ID_MASK GENMASK(15, 0)
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static int ffa_id_get(u16 *vm_id)
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{
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ffa_value_t id;
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invoke_ffa_fn((ffa_value_t){
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.a0 = FFA_ID_GET,
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}, &id);
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if (id.a0 == FFA_ERROR)
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return ffa_to_linux_errno((int)id.a2);
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*vm_id = FIELD_GET(VM_ID_MASK, (id.a2));
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return 0;
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}
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static int ffa_msg_send_direct_req(u16 src_id, u16 dst_id, bool mode_32bit,
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struct ffa_send_direct_data *data)
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{
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u32 req_id, resp_id, src_dst_ids = PACK_TARGET_INFO(src_id, dst_id);
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ffa_value_t ret;
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if (mode_32bit) {
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req_id = FFA_MSG_SEND_DIRECT_REQ;
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resp_id = FFA_MSG_SEND_DIRECT_RESP;
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} else {
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req_id = FFA_FN_NATIVE(MSG_SEND_DIRECT_REQ);
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resp_id = FFA_FN_NATIVE(MSG_SEND_DIRECT_RESP);
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}
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invoke_ffa_fn((ffa_value_t){
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.a0 = req_id, .a1 = src_dst_ids, .a2 = 0,
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.a3 = data->data0, .a4 = data->data1, .a5 = data->data2,
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.a6 = data->data3, .a7 = data->data4,
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}, &ret);
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while (ret.a0 == FFA_INTERRUPT)
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invoke_ffa_fn((ffa_value_t){
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.a0 = FFA_RUN, .a1 = ret.a1,
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}, &ret);
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if (ret.a0 == FFA_ERROR)
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return ffa_to_linux_errno((int)ret.a2);
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if (ret.a0 == resp_id) {
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data->data0 = ret.a3;
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data->data1 = ret.a4;
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data->data2 = ret.a5;
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data->data3 = ret.a6;
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data->data4 = ret.a7;
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return 0;
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}
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return -EINVAL;
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}
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static int ffa_mem_first_frag(u32 func_id, phys_addr_t buf, u32 buf_sz,
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u32 frag_len, u32 len, u64 *handle)
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{
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ffa_value_t ret;
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invoke_ffa_fn((ffa_value_t){
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.a0 = func_id, .a1 = len, .a2 = frag_len,
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.a3 = buf, .a4 = buf_sz,
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}, &ret);
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while (ret.a0 == FFA_MEM_OP_PAUSE)
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invoke_ffa_fn((ffa_value_t){
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.a0 = FFA_MEM_OP_RESUME,
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.a1 = ret.a1, .a2 = ret.a2,
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}, &ret);
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if (ret.a0 == FFA_ERROR)
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return ffa_to_linux_errno((int)ret.a2);
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if (ret.a0 != FFA_SUCCESS)
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return -EOPNOTSUPP;
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if (handle)
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*handle = PACK_HANDLE(ret.a2, ret.a3);
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return frag_len;
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}
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static int ffa_mem_next_frag(u64 handle, u32 frag_len)
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{
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ffa_value_t ret;
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invoke_ffa_fn((ffa_value_t){
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.a0 = FFA_MEM_FRAG_TX,
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.a1 = HANDLE_LOW(handle), .a2 = HANDLE_HIGH(handle),
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.a3 = frag_len,
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}, &ret);
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while (ret.a0 == FFA_MEM_OP_PAUSE)
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invoke_ffa_fn((ffa_value_t){
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.a0 = FFA_MEM_OP_RESUME,
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.a1 = ret.a1, .a2 = ret.a2,
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}, &ret);
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if (ret.a0 == FFA_ERROR)
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return ffa_to_linux_errno((int)ret.a2);
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if (ret.a0 != FFA_MEM_FRAG_RX)
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return -EOPNOTSUPP;
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return ret.a3;
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}
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static int
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ffa_transmit_fragment(u32 func_id, phys_addr_t buf, u32 buf_sz, u32 frag_len,
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u32 len, u64 *handle, bool first)
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{
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if (!first)
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return ffa_mem_next_frag(*handle, frag_len);
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return ffa_mem_first_frag(func_id, buf, buf_sz, frag_len, len, handle);
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}
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static u32 ffa_get_num_pages_sg(struct scatterlist *sg)
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{
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u32 num_pages = 0;
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do {
|
|
num_pages += sg->length / FFA_PAGE_SIZE;
|
|
} while ((sg = sg_next(sg)));
|
|
|
|
return num_pages;
|
|
}
|
|
|
|
static int
|
|
ffa_setup_and_transmit(u32 func_id, void *buffer, u32 max_fragsize,
|
|
struct ffa_mem_ops_args *args)
|
|
{
|
|
int rc = 0;
|
|
bool first = true;
|
|
phys_addr_t addr = 0;
|
|
struct ffa_composite_mem_region *composite;
|
|
struct ffa_mem_region_addr_range *constituents;
|
|
struct ffa_mem_region_attributes *ep_mem_access;
|
|
struct ffa_mem_region *mem_region = buffer;
|
|
u32 idx, frag_len, length, buf_sz = 0, num_entries = sg_nents(args->sg);
|
|
|
|
mem_region->tag = args->tag;
|
|
mem_region->flags = args->flags;
|
|
mem_region->sender_id = drv_info->vm_id;
|
|
mem_region->attributes = FFA_MEM_NORMAL | FFA_MEM_WRITE_BACK |
|
|
FFA_MEM_INNER_SHAREABLE;
|
|
ep_mem_access = &mem_region->ep_mem_access[0];
|
|
|
|
for (idx = 0; idx < args->nattrs; idx++, ep_mem_access++) {
|
|
ep_mem_access->receiver = args->attrs[idx].receiver;
|
|
ep_mem_access->attrs = args->attrs[idx].attrs;
|
|
ep_mem_access->composite_off = COMPOSITE_OFFSET(args->nattrs);
|
|
}
|
|
mem_region->ep_count = args->nattrs;
|
|
|
|
composite = buffer + COMPOSITE_OFFSET(args->nattrs);
|
|
composite->total_pg_cnt = ffa_get_num_pages_sg(args->sg);
|
|
composite->addr_range_cnt = num_entries;
|
|
|
|
length = COMPOSITE_CONSTITUENTS_OFFSET(args->nattrs, num_entries);
|
|
frag_len = COMPOSITE_CONSTITUENTS_OFFSET(args->nattrs, 0);
|
|
if (frag_len > max_fragsize)
|
|
return -ENXIO;
|
|
|
|
if (!args->use_txbuf) {
|
|
addr = virt_to_phys(buffer);
|
|
buf_sz = max_fragsize / FFA_PAGE_SIZE;
|
|
}
|
|
|
|
constituents = buffer + frag_len;
|
|
idx = 0;
|
|
do {
|
|
if (frag_len == max_fragsize) {
|
|
rc = ffa_transmit_fragment(func_id, addr, buf_sz,
|
|
frag_len, length,
|
|
&args->g_handle, first);
|
|
if (rc < 0)
|
|
return -ENXIO;
|
|
|
|
first = false;
|
|
idx = 0;
|
|
frag_len = 0;
|
|
constituents = buffer;
|
|
}
|
|
|
|
if ((void *)constituents - buffer > max_fragsize) {
|
|
pr_err("Memory Region Fragment > Tx Buffer size\n");
|
|
return -EFAULT;
|
|
}
|
|
|
|
constituents->address = sg_phys(args->sg);
|
|
constituents->pg_cnt = args->sg->length / FFA_PAGE_SIZE;
|
|
constituents++;
|
|
frag_len += sizeof(struct ffa_mem_region_addr_range);
|
|
} while ((args->sg = sg_next(args->sg)));
|
|
|
|
return ffa_transmit_fragment(func_id, addr, buf_sz, frag_len,
|
|
length, &args->g_handle, first);
|
|
}
|
|
|
|
static int ffa_memory_ops(u32 func_id, struct ffa_mem_ops_args *args)
|
|
{
|
|
int ret;
|
|
void *buffer;
|
|
|
|
if (!args->use_txbuf) {
|
|
buffer = alloc_pages_exact(RXTX_BUFFER_SIZE, GFP_KERNEL);
|
|
if (!buffer)
|
|
return -ENOMEM;
|
|
} else {
|
|
buffer = drv_info->tx_buffer;
|
|
mutex_lock(&drv_info->tx_lock);
|
|
}
|
|
|
|
ret = ffa_setup_and_transmit(func_id, buffer, RXTX_BUFFER_SIZE, args);
|
|
|
|
if (args->use_txbuf)
|
|
mutex_unlock(&drv_info->tx_lock);
|
|
else
|
|
free_pages_exact(buffer, RXTX_BUFFER_SIZE);
|
|
|
|
return ret < 0 ? ret : 0;
|
|
}
|
|
|
|
static int ffa_memory_reclaim(u64 g_handle, u32 flags)
|
|
{
|
|
ffa_value_t ret;
|
|
|
|
invoke_ffa_fn((ffa_value_t){
|
|
.a0 = FFA_MEM_RECLAIM,
|
|
.a1 = HANDLE_LOW(g_handle), .a2 = HANDLE_HIGH(g_handle),
|
|
.a3 = flags,
|
|
}, &ret);
|
|
|
|
if (ret.a0 == FFA_ERROR)
|
|
return ffa_to_linux_errno((int)ret.a2);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static u32 ffa_api_version_get(void)
|
|
{
|
|
return drv_info->version;
|
|
}
|
|
|
|
static int ffa_partition_info_get(const char *uuid_str,
|
|
struct ffa_partition_info *buffer)
|
|
{
|
|
int count;
|
|
uuid_t uuid;
|
|
struct ffa_partition_info *pbuf;
|
|
|
|
if (uuid_parse(uuid_str, &uuid)) {
|
|
pr_err("invalid uuid (%s)\n", uuid_str);
|
|
return -ENODEV;
|
|
}
|
|
|
|
count = ffa_partition_probe(&uuid, &pbuf);
|
|
if (count <= 0)
|
|
return -ENOENT;
|
|
|
|
memcpy(buffer, pbuf, sizeof(*pbuf) * count);
|
|
kfree(pbuf);
|
|
return 0;
|
|
}
|
|
|
|
static void ffa_mode_32bit_set(struct ffa_device *dev)
|
|
{
|
|
dev->mode_32bit = true;
|
|
}
|
|
|
|
static int ffa_sync_send_receive(struct ffa_device *dev,
|
|
struct ffa_send_direct_data *data)
|
|
{
|
|
return ffa_msg_send_direct_req(drv_info->vm_id, dev->vm_id,
|
|
dev->mode_32bit, data);
|
|
}
|
|
|
|
static int
|
|
ffa_memory_share(struct ffa_device *dev, struct ffa_mem_ops_args *args)
|
|
{
|
|
if (dev->mode_32bit)
|
|
return ffa_memory_ops(FFA_MEM_SHARE, args);
|
|
|
|
return ffa_memory_ops(FFA_FN_NATIVE(MEM_SHARE), args);
|
|
}
|
|
|
|
static int
|
|
ffa_memory_lend(struct ffa_device *dev, struct ffa_mem_ops_args *args)
|
|
{
|
|
/* Note that upon a successful MEM_LEND request the caller
|
|
* must ensure that the memory region specified is not accessed
|
|
* until a successful MEM_RECALIM call has been made.
|
|
* On systems with a hypervisor present this will been enforced,
|
|
* however on systems without a hypervisor the responsibility
|
|
* falls to the calling kernel driver to prevent access.
|
|
*/
|
|
if (dev->mode_32bit)
|
|
return ffa_memory_ops(FFA_MEM_LEND, args);
|
|
|
|
return ffa_memory_ops(FFA_FN_NATIVE(MEM_LEND), args);
|
|
}
|
|
|
|
static const struct ffa_dev_ops ffa_ops = {
|
|
.api_version_get = ffa_api_version_get,
|
|
.partition_info_get = ffa_partition_info_get,
|
|
.mode_32bit_set = ffa_mode_32bit_set,
|
|
.sync_send_receive = ffa_sync_send_receive,
|
|
.memory_reclaim = ffa_memory_reclaim,
|
|
.memory_share = ffa_memory_share,
|
|
.memory_lend = ffa_memory_lend,
|
|
};
|
|
|
|
const struct ffa_dev_ops *ffa_dev_ops_get(struct ffa_device *dev)
|
|
{
|
|
if (ffa_device_is_valid(dev))
|
|
return &ffa_ops;
|
|
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL_GPL(ffa_dev_ops_get);
|
|
|
|
void ffa_device_match_uuid(struct ffa_device *ffa_dev, const uuid_t *uuid)
|
|
{
|
|
int count, idx;
|
|
struct ffa_partition_info *pbuf, *tpbuf;
|
|
|
|
count = ffa_partition_probe(uuid, &pbuf);
|
|
if (count <= 0)
|
|
return;
|
|
|
|
for (idx = 0, tpbuf = pbuf; idx < count; idx++, tpbuf++)
|
|
if (tpbuf->id == ffa_dev->vm_id)
|
|
uuid_copy(&ffa_dev->uuid, uuid);
|
|
kfree(pbuf);
|
|
}
|
|
|
|
static void ffa_setup_partitions(void)
|
|
{
|
|
int count, idx;
|
|
struct ffa_device *ffa_dev;
|
|
struct ffa_partition_info *pbuf, *tpbuf;
|
|
|
|
count = ffa_partition_probe(&uuid_null, &pbuf);
|
|
if (count <= 0) {
|
|
pr_info("%s: No partitions found, error %d\n", __func__, count);
|
|
return;
|
|
}
|
|
|
|
for (idx = 0, tpbuf = pbuf; idx < count; idx++, tpbuf++) {
|
|
/* Note that the &uuid_null parameter will require
|
|
* ffa_device_match() to find the UUID of this partition id
|
|
* with help of ffa_device_match_uuid(). Once the FF-A spec
|
|
* is updated to provide correct UUID here for each partition
|
|
* as part of the discovery API, we need to pass the
|
|
* discovered UUID here instead.
|
|
*/
|
|
ffa_dev = ffa_device_register(&uuid_null, tpbuf->id);
|
|
if (!ffa_dev) {
|
|
pr_err("%s: failed to register partition ID 0x%x\n",
|
|
__func__, tpbuf->id);
|
|
continue;
|
|
}
|
|
}
|
|
kfree(pbuf);
|
|
}
|
|
|
|
static int __init ffa_init(void)
|
|
{
|
|
int ret;
|
|
|
|
ret = ffa_transport_init(&invoke_ffa_fn);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = arm_ffa_bus_init();
|
|
if (ret)
|
|
return ret;
|
|
|
|
drv_info = kzalloc(sizeof(*drv_info), GFP_KERNEL);
|
|
if (!drv_info) {
|
|
ret = -ENOMEM;
|
|
goto ffa_bus_exit;
|
|
}
|
|
|
|
ret = ffa_version_check(&drv_info->version);
|
|
if (ret)
|
|
goto free_drv_info;
|
|
|
|
if (ffa_id_get(&drv_info->vm_id)) {
|
|
pr_err("failed to obtain VM id for self\n");
|
|
ret = -ENODEV;
|
|
goto free_drv_info;
|
|
}
|
|
|
|
drv_info->rx_buffer = alloc_pages_exact(RXTX_BUFFER_SIZE, GFP_KERNEL);
|
|
if (!drv_info->rx_buffer) {
|
|
ret = -ENOMEM;
|
|
goto free_pages;
|
|
}
|
|
|
|
drv_info->tx_buffer = alloc_pages_exact(RXTX_BUFFER_SIZE, GFP_KERNEL);
|
|
if (!drv_info->tx_buffer) {
|
|
ret = -ENOMEM;
|
|
goto free_pages;
|
|
}
|
|
|
|
ret = ffa_rxtx_map(virt_to_phys(drv_info->tx_buffer),
|
|
virt_to_phys(drv_info->rx_buffer),
|
|
RXTX_BUFFER_SIZE / FFA_PAGE_SIZE);
|
|
if (ret) {
|
|
pr_err("failed to register FFA RxTx buffers\n");
|
|
goto free_pages;
|
|
}
|
|
|
|
mutex_init(&drv_info->rx_lock);
|
|
mutex_init(&drv_info->tx_lock);
|
|
|
|
ffa_setup_partitions();
|
|
|
|
return 0;
|
|
free_pages:
|
|
if (drv_info->tx_buffer)
|
|
free_pages_exact(drv_info->tx_buffer, RXTX_BUFFER_SIZE);
|
|
free_pages_exact(drv_info->rx_buffer, RXTX_BUFFER_SIZE);
|
|
free_drv_info:
|
|
kfree(drv_info);
|
|
ffa_bus_exit:
|
|
arm_ffa_bus_exit();
|
|
return ret;
|
|
}
|
|
subsys_initcall(ffa_init);
|
|
|
|
static void __exit ffa_exit(void)
|
|
{
|
|
ffa_rxtx_unmap(drv_info->vm_id);
|
|
free_pages_exact(drv_info->tx_buffer, RXTX_BUFFER_SIZE);
|
|
free_pages_exact(drv_info->rx_buffer, RXTX_BUFFER_SIZE);
|
|
kfree(drv_info);
|
|
arm_ffa_bus_exit();
|
|
}
|
|
module_exit(ffa_exit);
|
|
|
|
MODULE_ALIAS("arm-ffa");
|
|
MODULE_AUTHOR("Sudeep Holla <sudeep.holla@arm.com>");
|
|
MODULE_DESCRIPTION("Arm FF-A interface driver");
|
|
MODULE_LICENSE("GPL v2");
|