diff options
Diffstat (limited to 'drivers/firmware')
-rw-r--r-- | drivers/firmware/Kconfig | 1 | ||||
-rw-r--r-- | drivers/firmware/Makefile | 1 | ||||
-rw-r--r-- | drivers/firmware/arm_ffa/Kconfig | 21 | ||||
-rw-r--r-- | drivers/firmware/arm_ffa/Makefile | 6 | ||||
-rw-r--r-- | drivers/firmware/arm_ffa/bus.c | 210 | ||||
-rw-r--r-- | drivers/firmware/arm_ffa/common.h | 31 | ||||
-rw-r--r-- | drivers/firmware/arm_ffa/driver.c | 731 | ||||
-rw-r--r-- | drivers/firmware/arm_ffa/smccc.c | 39 |
8 files changed, 1040 insertions, 0 deletions
diff --git a/drivers/firmware/Kconfig b/drivers/firmware/Kconfig index a9c613c32282..1db738d5b301 100644 --- a/drivers/firmware/Kconfig +++ b/drivers/firmware/Kconfig @@ -296,6 +296,7 @@ config TURRIS_MOX_RWTM other manufacturing data and also utilize the Entropy Bit Generator for hardware random number generation. +source "drivers/firmware/arm_ffa/Kconfig" source "drivers/firmware/broadcom/Kconfig" source "drivers/firmware/google/Kconfig" source "drivers/firmware/efi/Kconfig" diff --git a/drivers/firmware/Makefile b/drivers/firmware/Makefile index 5e013b6a3692..546ac8e7f6d0 100644 --- a/drivers/firmware/Makefile +++ b/drivers/firmware/Makefile @@ -22,6 +22,7 @@ obj-$(CONFIG_TI_SCI_PROTOCOL) += ti_sci.o obj-$(CONFIG_TRUSTED_FOUNDATIONS) += trusted_foundations.o obj-$(CONFIG_TURRIS_MOX_RWTM) += turris-mox-rwtm.o +obj-y += arm_ffa/ obj-y += arm_scmi/ obj-y += broadcom/ obj-y += meson/ diff --git a/drivers/firmware/arm_ffa/Kconfig b/drivers/firmware/arm_ffa/Kconfig new file mode 100644 index 000000000000..5e3ae5cf82e8 --- /dev/null +++ b/drivers/firmware/arm_ffa/Kconfig @@ -0,0 +1,21 @@ +# SPDX-License-Identifier: GPL-2.0-only +config ARM_FFA_TRANSPORT + tristate "Arm Firmware Framework for Armv8-A" + depends on OF + depends on ARM64 + default n + help + This Firmware Framework(FF) for Arm A-profile processors describes + interfaces that standardize communication between the various + software images which includes communication between images in + the Secure world and Normal world. It also leverages the + virtualization extension to isolate software images provided + by an ecosystem of vendors from each other. + + This driver provides interface for all the client drivers making + use of the features offered by ARM FF-A. + +config ARM_FFA_SMCCC + bool + default ARM_FFA_TRANSPORT + depends on ARM64 && HAVE_ARM_SMCCC_DISCOVERY diff --git a/drivers/firmware/arm_ffa/Makefile b/drivers/firmware/arm_ffa/Makefile new file mode 100644 index 000000000000..9d9f37523200 --- /dev/null +++ b/drivers/firmware/arm_ffa/Makefile @@ -0,0 +1,6 @@ +# SPDX-License-Identifier: GPL-2.0-only +ffa-bus-y = bus.o +ffa-driver-y = driver.o +ffa-transport-$(CONFIG_ARM_FFA_SMCCC) += smccc.o +ffa-module-objs := $(ffa-bus-y) $(ffa-driver-y) $(ffa-transport-y) +obj-$(CONFIG_ARM_FFA_TRANSPORT) = ffa-module.o diff --git a/drivers/firmware/arm_ffa/bus.c b/drivers/firmware/arm_ffa/bus.c new file mode 100644 index 000000000000..83166e02b191 --- /dev/null +++ b/drivers/firmware/arm_ffa/bus.c @@ -0,0 +1,210 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2021 ARM Ltd. + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include <linux/arm_ffa.h> +#include <linux/device.h> +#include <linux/fs.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/slab.h> +#include <linux/types.h> + +#include "common.h" + +static int ffa_device_match(struct device *dev, struct device_driver *drv) +{ + const struct ffa_device_id *id_table; + struct ffa_device *ffa_dev; + + id_table = to_ffa_driver(drv)->id_table; + ffa_dev = to_ffa_dev(dev); + + while (!uuid_is_null(&id_table->uuid)) { + /* + * FF-A v1.0 doesn't provide discovery of UUIDs, just the + * partition IDs, so fetch the partitions IDs for this + * id_table UUID and assign the UUID to the device if the + * partition ID matches + */ + if (uuid_is_null(&ffa_dev->uuid)) + ffa_device_match_uuid(ffa_dev, &id_table->uuid); + + if (uuid_equal(&ffa_dev->uuid, &id_table->uuid)) + return 1; + id_table++; + } + + return 0; +} + +static int ffa_device_probe(struct device *dev) +{ + struct ffa_driver *ffa_drv = to_ffa_driver(dev->driver); + struct ffa_device *ffa_dev = to_ffa_dev(dev); + + if (!ffa_device_match(dev, dev->driver)) + return -ENODEV; + + return ffa_drv->probe(ffa_dev); +} + +static int ffa_device_uevent(struct device *dev, struct kobj_uevent_env *env) +{ + struct ffa_device *ffa_dev = to_ffa_dev(dev); + + return add_uevent_var(env, "MODALIAS=arm_ffa:%04x:%pUb", + ffa_dev->vm_id, &ffa_dev->uuid); +} + +static ssize_t partition_id_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct ffa_device *ffa_dev = to_ffa_dev(dev); + + return sprintf(buf, "0x%04x\n", ffa_dev->vm_id); +} +static DEVICE_ATTR_RO(partition_id); + +static ssize_t uuid_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct ffa_device *ffa_dev = to_ffa_dev(dev); + + return sprintf(buf, "%pUb\n", &ffa_dev->uuid); +} +static DEVICE_ATTR_RO(uuid); + +static struct attribute *ffa_device_attributes_attrs[] = { + &dev_attr_partition_id.attr, + &dev_attr_uuid.attr, + NULL, +}; +ATTRIBUTE_GROUPS(ffa_device_attributes); + +struct bus_type ffa_bus_type = { + .name = "arm_ffa", + .match = ffa_device_match, + .probe = ffa_device_probe, + .uevent = ffa_device_uevent, + .dev_groups = ffa_device_attributes_groups, +}; +EXPORT_SYMBOL_GPL(ffa_bus_type); + +int ffa_driver_register(struct ffa_driver *driver, struct module *owner, + const char *mod_name) +{ + int ret; + + driver->driver.bus = &ffa_bus_type; + driver->driver.name = driver->name; + driver->driver.owner = owner; + driver->driver.mod_name = mod_name; + + ret = driver_register(&driver->driver); + if (!ret) + pr_debug("registered new ffa driver %s\n", driver->name); + + return ret; +} +EXPORT_SYMBOL_GPL(ffa_driver_register); + +void ffa_driver_unregister(struct ffa_driver *driver) +{ + driver_unregister(&driver->driver); +} +EXPORT_SYMBOL_GPL(ffa_driver_unregister); + +static void ffa_release_device(struct device *dev) +{ + struct ffa_device *ffa_dev = to_ffa_dev(dev); + + kfree(ffa_dev); +} + +static int __ffa_devices_unregister(struct device *dev, void *data) +{ + ffa_release_device(dev); + + return 0; +} + +static void ffa_devices_unregister(void) +{ + bus_for_each_dev(&ffa_bus_type, NULL, NULL, + __ffa_devices_unregister); +} + +bool ffa_device_is_valid(struct ffa_device *ffa_dev) +{ + bool valid = false; + struct device *dev = NULL; + struct ffa_device *tmp_dev; + + do { + dev = bus_find_next_device(&ffa_bus_type, dev); + tmp_dev = to_ffa_dev(dev); + if (tmp_dev == ffa_dev) { + valid = true; + break; + } + put_device(dev); + } while (dev); + + put_device(dev); + + return valid; +} + +struct ffa_device *ffa_device_register(const uuid_t *uuid, int vm_id) +{ + int ret; + struct device *dev; + struct ffa_device *ffa_dev; + + ffa_dev = kzalloc(sizeof(*ffa_dev), GFP_KERNEL); + if (!ffa_dev) + return NULL; + + dev = &ffa_dev->dev; + dev->bus = &ffa_bus_type; + dev->release = ffa_release_device; + dev_set_name(&ffa_dev->dev, "arm-ffa-%04x", vm_id); + + ffa_dev->vm_id = vm_id; + uuid_copy(&ffa_dev->uuid, uuid); + + ret = device_register(&ffa_dev->dev); + if (ret) { + dev_err(dev, "unable to register device %s err=%d\n", + dev_name(dev), ret); + put_device(dev); + return NULL; + } + + return ffa_dev; +} +EXPORT_SYMBOL_GPL(ffa_device_register); + +void ffa_device_unregister(struct ffa_device *ffa_dev) +{ + if (!ffa_dev) + return; + + device_unregister(&ffa_dev->dev); +} +EXPORT_SYMBOL_GPL(ffa_device_unregister); + +int arm_ffa_bus_init(void) +{ + return bus_register(&ffa_bus_type); +} + +void arm_ffa_bus_exit(void) +{ + ffa_devices_unregister(); + bus_unregister(&ffa_bus_type); +} diff --git a/drivers/firmware/arm_ffa/common.h b/drivers/firmware/arm_ffa/common.h new file mode 100644 index 000000000000..d6eccf1fd3f6 --- /dev/null +++ b/drivers/firmware/arm_ffa/common.h @@ -0,0 +1,31 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright (C) 2021 ARM Ltd. + */ + +#ifndef _FFA_COMMON_H +#define _FFA_COMMON_H + +#include <linux/arm_ffa.h> +#include <linux/arm-smccc.h> +#include <linux/err.h> + +typedef struct arm_smccc_1_2_regs ffa_value_t; + +typedef void (ffa_fn)(ffa_value_t, ffa_value_t *); + +int arm_ffa_bus_init(void); +void arm_ffa_bus_exit(void); +bool ffa_device_is_valid(struct ffa_device *ffa_dev); +void ffa_device_match_uuid(struct ffa_device *ffa_dev, const uuid_t *uuid); + +#ifdef CONFIG_ARM_FFA_SMCCC +int __init ffa_transport_init(ffa_fn **invoke_ffa_fn); +#else +static inline int __init ffa_transport_init(ffa_fn **invoke_ffa_fn) +{ + return -EOPNOTSUPP; +} +#endif + +#endif /* _FFA_COMMON_H */ diff --git a/drivers/firmware/arm_ffa/driver.c b/drivers/firmware/arm_ffa/driver.c new file mode 100644 index 000000000000..b1edb4b2e94a --- /dev/null +++ b/drivers/firmware/arm_ffa/driver.c @@ -0,0 +1,731 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Arm Firmware Framework for ARMv8-A(FFA) interface driver + * + * The Arm FFA specification[1] describes a software architecture to + * leverages the virtualization extension to isolate software images + * provided by an ecosystem of vendors from each other and describes + * interfaces that standardize communication between the various software + * images including communication between images in the Secure world and + * Normal world. Any Hypervisor could use the FFA interfaces to enable + * communication between VMs it manages. + * + * The Hypervisor a.k.a Partition managers in FFA terminology can assign + * system resources(Memory regions, Devices, CPU cycles) to the partitions + * and manage isolation amongst them. + * + * [1] https://developer.arm.com/docs/den0077/latest + * + * Copyright (C) 2021 ARM Ltd. + */ + +#define DRIVER_NAME "ARM FF-A" +#define pr_fmt(fmt) DRIVER_NAME ": " fmt + +#include <linux/arm_ffa.h> +#include <linux/bitfield.h> +#include <linux/device.h> +#include <linux/io.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/mm.h> +#include <linux/scatterlist.h> +#include <linux/slab.h> +#include <linux/uuid.h> + +#include "common.h" + +#define FFA_DRIVER_VERSION FFA_VERSION_1_0 + +#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_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) + +/* + * 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 MAJOR_VERSION_MASK GENMASK(30, 16) +#define MINOR_VERSION_MASK GENMASK(15, 0) +#define MAJOR_VERSION(x) ((u16)(FIELD_GET(MAJOR_VERSION_MASK, (x)))) +#define MINOR_VERSION(x) ((u16)(FIELD_GET(MINOR_VERSION_MASK, (x)))) +#define PACK_VERSION_INFO(major, minor) \ + (FIELD_PREP(MAJOR_VERSION_MASK, (major)) | \ + FIELD_PREP(MINOR_VERSION_MASK, (minor))) +#define FFA_VERSION_1_0 PACK_VERSION_INFO(1, 0) +#define FFA_MIN_VERSION FFA_VERSION_1_0 + +#define SENDER_ID_MASK GENMASK(31, 16) +#define RECEIVER_ID_MASK GENMASK(15, 0) +#define SENDER_ID(x) ((u16)(FIELD_GET(SENDER_ID_MASK, (x)))) +#define RECEIVER_ID(x) ((u16)(FIELD_GET(RECEIVER_ID_MASK, (x)))) +#define PACK_TARGET_INFO(s, r) \ + (FIELD_PREP(SENDER_ID_MASK, (s)) | FIELD_PREP(RECEIVER_ID_MASK, (r))) + +/** + * 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 +/* + * Keeping RX TX buffer size as 4K for now + * 64K may be preferred to keep it min a page in 64K PAGE_SIZE config + */ +#define RXTX_BUFFER_SIZE SZ_4K + +static ffa_fn *invoke_ffa_fn; + +static const int ffa_linux_errmap[] = { + /* better than switch case as long as return value is continuous */ + 0, /* FFA_RET_SUCCESS */ + -EOPNOTSUPP, /* FFA_RET_NOT_SUPPORTED */ + -EINVAL, /* FFA_RET_INVALID_PARAMETERS */ + -ENOMEM, /* FFA_RET_NO_MEMORY */ + -EBUSY, /* FFA_RET_BUSY */ + -EINTR, /* FFA_RET_INTERRUPTED */ + -EACCES, /* FFA_RET_DENIED */ + -EAGAIN, /* FFA_RET_RETRY */ + -ECANCELED, /* FFA_RET_ABORTED */ +}; + +static inline int ffa_to_linux_errno(int errno) +{ + if (errno < FFA_RET_SUCCESS && errno >= -ARRAY_SIZE(ffa_linux_errmap)) + return ffa_linux_errmap[-errno]; + return -EINVAL; +} + +struct ffa_drv_info { + u32 version; + u16 vm_id; + struct mutex rx_lock; /* lock to protect Rx buffer */ + struct mutex tx_lock; /* lock to protect Tx buffer */ + void *rx_buffer; + void *tx_buffer; +}; + +static struct ffa_drv_info *drv_info; + +static int ffa_version_check(u32 *version) +{ + ffa_value_t ver; + + invoke_ffa_fn((ffa_value_t){ + .a0 = FFA_VERSION, .a1 = FFA_DRIVER_VERSION, + }, &ver); + + if (ver.a0 == FFA_RET_NOT_SUPPORTED) { + pr_info("FFA_VERSION returned not supported\n"); + return -EOPNOTSUPP; + } + + if (ver.a0 < FFA_MIN_VERSION || ver.a0 > FFA_DRIVER_VERSION) { + pr_err("Incompatible version %d.%d found\n", + MAJOR_VERSION(ver.a0), MINOR_VERSION(ver.a0)); + return -EINVAL; + } + + *version = ver.a0; + pr_info("Version %d.%d found\n", MAJOR_VERSION(ver.a0), + MINOR_VERSION(ver.a0)); + return 0; +} + +static int ffa_rx_release(void) +{ + ffa_value_t ret; + + invoke_ffa_fn((ffa_value_t){ + .a0 = FFA_RX_RELEASE, + }, &ret); + + if (ret.a0 == FFA_ERROR) + return ffa_to_linux_errno((int)ret.a2); + + /* check for ret.a0 == FFA_RX_RELEASE ? */ + + return 0; +} + +static int ffa_rxtx_map(phys_addr_t tx_buf, phys_addr_t rx_buf, u32 pg_cnt) +{ + ffa_value_t ret; + + invoke_ffa_fn((ffa_value_t){ + .a0 = FFA_FN_NATIVE(RXTX_MAP), + .a1 = tx_buf, .a2 = rx_buf, .a3 = pg_cnt, + }, &ret); + + if (ret.a0 == FFA_ERROR) + return ffa_to_linux_errno((int)ret.a2); + + return 0; +} + +static int ffa_rxtx_unmap(u16 vm_id) +{ + ffa_value_t ret; + + invoke_ffa_fn((ffa_value_t){ + .a0 = FFA_RXTX_UNMAP, .a1 = PACK_TARGET_INFO(vm_id, 0), + }, &ret); + + if (ret.a0 == FFA_ERROR) + return ffa_to_linux_errno((int)ret.a2); + + return 0; +} + +/* buffer must be sizeof(struct ffa_partition_info) * num_partitions */ +static int +__ffa_partition_info_get(u32 uuid0, u32 uuid1, u32 uuid2, u32 uuid3, + struct ffa_partition_info *buffer, int num_partitions) +{ + int count; + ffa_value_t partition_info; + + mutex_lock(&drv_info->rx_lock); + invoke_ffa_fn((ffa_value_t){ + .a0 = FFA_PARTITION_INFO_GET, + .a1 = uuid0, .a2 = uuid1, .a3 = uuid2, .a4 = uuid3, + }, &partition_info); + + if (partition_info.a0 == FFA_ERROR) { + mutex_unlock(&drv_info->rx_lock); + return ffa_to_linux_errno((int)partition_info.a2); + } + + count = partition_info.a2; + + if (buffer && count <= num_partitions) + memcpy(buffer, drv_info->rx_buffer, sizeof(*buffer) * count); + + ffa_rx_release(); + + mutex_unlock(&drv_info->rx_lock); + + return count; +} + +/* buffer is allocated and caller must free the same if returned count > 0 */ +static int +ffa_partition_probe(const uuid_t *uuid, struct ffa_partition_info **buffer) +{ + int count; + u32 uuid0_4[4]; + struct ffa_partition_info *pbuf; + + export_uuid((u8 *)uuid0_4, uuid); + count = __ffa_partition_info_get(uuid0_4[0], uuid0_4[1], uuid0_4[2], + uuid0_4[3], NULL, 0); + if (count <= 0) + return count; + + pbuf = kcalloc(count, sizeof(*pbuf), GFP_KERNEL); + if (!pbuf) + return -ENOMEM; + + count = __ffa_partition_info_get(uuid0_4[0], uuid0_4[1], uuid0_4[2], + uuid0_4[3], pbuf, count); + if (count <= 0) + kfree(pbuf); + else + *buffer = pbuf; + + return count; +} + +#define VM_ID_MASK GENMASK(15, 0) +static int ffa_id_get(u16 *vm_id) +{ + ffa_value_t id; + + invoke_ffa_fn((ffa_value_t){ + .a0 = FFA_ID_GET, + }, &id); + + if (id.a0 == FFA_ERROR) + return ffa_to_linux_errno((int)id.a2); + + *vm_id = FIELD_GET(VM_ID_MASK, (id.a2)); + + return 0; +} + +static int ffa_msg_send_direct_req(u16 src_id, u16 dst_id, bool mode_32bit, + struct ffa_send_direct_data *data) +{ + u32 req_id, resp_id, src_dst_ids = PACK_TARGET_INFO(src_id, dst_id); + ffa_value_t ret; + + if (mode_32bit) { + req_id = FFA_MSG_SEND_DIRECT_REQ; + resp_id = FFA_MSG_SEND_DIRECT_RESP; + } else { + req_id = FFA_FN_NATIVE(MSG_SEND_DIRECT_REQ); + resp_id = FFA_FN_NATIVE(MSG_SEND_DIRECT_RESP); + } + + invoke_ffa_fn((ffa_value_t){ + .a0 = req_id, .a1 = src_dst_ids, .a2 = 0, + .a3 = data->data0, .a4 = data->data1, .a5 = data->data2, + .a6 = data->data3, .a7 = data->data4, + }, &ret); + + while (ret.a0 == FFA_INTERRUPT) + invoke_ffa_fn((ffa_value_t){ + .a0 = FFA_RUN, .a1 = ret.a1, + }, &ret); + + if (ret.a0 == FFA_ERROR) + return ffa_to_linux_errno((int)ret.a2); + + if (ret.a0 == resp_id) { + data->data0 = ret.a3; + data->data1 = ret.a4; + data->data2 = ret.a5; + data->data3 = ret.a6; + data->data4 = ret.a7; + return 0; + } + + return -EINVAL; +} + +static int ffa_mem_first_frag(u32 func_id, phys_addr_t buf, u32 buf_sz, + u32 frag_len, u32 len, u64 *handle) +{ + ffa_value_t ret; + + invoke_ffa_fn((ffa_value_t){ + .a0 = func_id, .a1 = len, .a2 = frag_len, + .a3 = buf, .a4 = buf_sz, + }, &ret); + + while (ret.a0 == FFA_MEM_OP_PAUSE) + invoke_ffa_fn((ffa_value_t){ + .a0 = FFA_MEM_OP_RESUME, + .a1 = ret.a1, .a2 = ret.a2, + }, &ret); + + if (ret.a0 == FFA_ERROR) + return ffa_to_linux_errno((int)ret.a2); + + if (ret.a0 != FFA_SUCCESS) + return -EOPNOTSUPP; + + if (handle) + *handle = PACK_HANDLE(ret.a2, ret.a3); + + return frag_len; +} + +static int ffa_mem_next_frag(u64 handle, u32 frag_len) +{ + ffa_value_t ret; + + invoke_ffa_fn((ffa_value_t){ + .a0 = FFA_MEM_FRAG_TX, + .a1 = HANDLE_LOW(handle), .a2 = HANDLE_HIGH(handle), + .a3 = frag_len, + }, &ret); + + while (ret.a0 == FFA_MEM_OP_PAUSE) + invoke_ffa_fn((ffa_value_t){ + .a0 = FFA_MEM_OP_RESUME, + .a1 = ret.a1, .a2 = ret.a2, + }, &ret); + + if (ret.a0 == FFA_ERROR) + return ffa_to_linux_errno((int)ret.a2); + + if (ret.a0 != FFA_MEM_FRAG_RX) + return -EOPNOTSUPP; + + return ret.a3; +} + +static int +ffa_transmit_fragment(u32 func_id, phys_addr_t buf, u32 buf_sz, u32 frag_len, + u32 len, u64 *handle, bool first) +{ + if (!first) + return ffa_mem_next_frag(*handle, frag_len); + + return ffa_mem_first_frag(func_id, buf, buf_sz, frag_len, len, handle); +} + +static u32 ffa_get_num_pages_sg(struct scatterlist *sg) +{ + u32 num_pages = 0; + + 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_null, &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 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, +}; + +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; + } + + ffa_dev_set_drvdata(ffa_dev, drv_info); + } + 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"); diff --git a/drivers/firmware/arm_ffa/smccc.c b/drivers/firmware/arm_ffa/smccc.c new file mode 100644 index 000000000000..4d85bfff0a4e --- /dev/null +++ b/drivers/firmware/arm_ffa/smccc.c @@ -0,0 +1,39 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) 2021 ARM Ltd. + */ + +#include <linux/printk.h> + +#include "common.h" + +static void __arm_ffa_fn_smc(ffa_value_t args, ffa_value_t *res) +{ + arm_smccc_1_2_smc(&args, res); +} + +static void __arm_ffa_fn_hvc(ffa_value_t args, ffa_value_t *res) +{ + arm_smccc_1_2_hvc(&args, res); +} + +int __init ffa_transport_init(ffa_fn **invoke_ffa_fn) +{ + enum arm_smccc_conduit conduit; + + if (arm_smccc_get_version() < ARM_SMCCC_VERSION_1_2) + return -EOPNOTSUPP; + + conduit = arm_smccc_1_1_get_conduit(); + if (conduit == SMCCC_CONDUIT_NONE) { + pr_err("%s: invalid SMCCC conduit\n", __func__); + return -EOPNOTSUPP; + } + + if (conduit == SMCCC_CONDUIT_SMC) + *invoke_ffa_fn = __arm_ffa_fn_smc; + else + *invoke_ffa_fn = __arm_ffa_fn_hvc; + + return 0; +} |