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|
From 85df9333f0adf60fd76eb5ebb21b89c5b0a86c10 Mon Sep 17 00:00:00 2001
From: Sudeep Holla <sudeep.holla@arm.com>
Date: Tue, 18 May 2021 17:36:18 +0100
Subject: [PATCH 01/32] firmware: arm_ffa: Backport of arm_ffa driver
This is a backport of upstream ARM FFA driver from:
https://git.kernel.org/pub/scm/linux/kernel/git/sudeep.holla/linux.git/commit/?h=v5.10/ffa&id=c0aff30cb9ad6a00c82acef0f2a48f99adf997c0
to branch=android12-5.10-lts
arm64: smccc: Add support for SMCCCv1.2 extended input/output registers
commit 3fdc0cb59d97f87e2cc708d424f1538e31744286 upstream.
firmware: arm_ffa: Add initial FFA bus support for device enumeration
commit e781858488b918e30a6ff28e9eab6058b787e3b3 upstream.
firmware: arm_ffa: Add initial Arm FFA driver support
commit 3bbfe9871005f38df2955b2e125933edf1d2feef upstream.
firmware: arm_ffa: Add support for SMCCC as transport to FFA driver
commit 714be77e976a4b013b935b3223b2ef68856084d0 upstream.
firmware: arm_ffa: Setup in-kernel users of FFA partitions
commit d0c0bce831223b08e5bade2cefc93c3ddb790796 upstream.
firmware: arm_ffa: Add support for MEM_* interfaces
commit cc2195fe536c28e192df5d07e6dd277af36814b4 upstream.
firmware: arm_ffa: Ensure drivers provide a probe function
commit 92743071464fca5acbbe812d9a0d88de3eaaad36 upstream.
firmware: arm_ffa: Simplify probe function
commit e362547addc39e4bb18ad5bdfd59ce4d512d0c08 upstream.
firmware: arm_ffa: Fix the comment style
commit ba684a31d3626c86cd9097e12d6ed57d224d077d upstream.
firmware: arm_ffa: Fix a possible ffa_linux_errmap buffer overflow
commit dd925db6f07556061c11ab1fbfa4a0145ae6b438 upstream.
firmware: arm_ffa: Add missing remove callback to ffa_bus_type
commit 244f5d597e1ea519c2085fbd9819458688775e42 upstream.
firmware: arm_ffa: Fix __ffa_devices_unregister
commit eb7b52e6db7c21400b9b2d539f9343fb6e94bd94 upstream.
firmware: arm_ffa: Handle compatibility with different firmware versions
commit 8e3f9da608f14cfebac2659d8dd8737b79d01308 upstream.
firmware: arm_ffa: Add support for MEM_LEND
commit 82a8daaecfd9382e9450a05f86be8a274cf69a27 upstream.
firmware: arm_ffa: Remove unused 'compat_version' variable
commit 01537a078b86917c7bb69aa4b756b42b980c158b upstream.
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
Change-Id: If9df40d2d10be9e3c95298820bc20c201ea1774c
Signed-off-by: Arunachalam Ganapathy <arunachalam.ganapathy@arm.com>
Upstream-Status: Backport
Change-Id: I8e6197d8b7ef6654dacd21450069b8e284a3cec5
---
MAINTAINERS | 7 +
arch/arm64/kernel/asm-offsets.c | 9 +
arch/arm64/kernel/smccc-call.S | 57 +++
drivers/firmware/Kconfig | 1 +
drivers/firmware/Makefile | 1 +
drivers/firmware/arm_ffa/Kconfig | 21 +
drivers/firmware/arm_ffa/Makefile | 6 +
drivers/firmware/arm_ffa/bus.c | 220 +++++++++
drivers/firmware/arm_ffa/common.h | 31 ++
drivers/firmware/arm_ffa/driver.c | 776 ++++++++++++++++++++++++++++++
drivers/firmware/arm_ffa/smccc.c | 39 ++
include/linux/arm-smccc.h | 55 +++
include/linux/arm_ffa.h | 269 +++++++++++
13 files changed, 1492 insertions(+)
create mode 100644 drivers/firmware/arm_ffa/Kconfig
create mode 100644 drivers/firmware/arm_ffa/Makefile
create mode 100644 drivers/firmware/arm_ffa/bus.c
create mode 100644 drivers/firmware/arm_ffa/common.h
create mode 100644 drivers/firmware/arm_ffa/driver.c
create mode 100644 drivers/firmware/arm_ffa/smccc.c
create mode 100644 include/linux/arm_ffa.h
diff --git a/MAINTAINERS b/MAINTAINERS
index 5234423c477a..d5fdc9e68c89 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -6847,6 +6847,13 @@ F: include/linux/firewire.h
F: include/uapi/linux/firewire*.h
F: tools/firewire/
+FIRMWARE FRAMEWORK FOR ARMV8-A
+M: Sudeep Holla <sudeep.holla@arm.com>
+L: linux-arm-kernel@lists.infradead.org
+S: Maintained
+F: drivers/firmware/arm_ffa/
+F: include/linux/arm_ffa.h
+
FIRMWARE LOADER (request_firmware)
M: Luis Chamberlain <mcgrof@kernel.org>
L: linux-kernel@vger.kernel.org
diff --git a/arch/arm64/kernel/asm-offsets.c b/arch/arm64/kernel/asm-offsets.c
index 93da876a58e6..bad4a367da28 100644
--- a/arch/arm64/kernel/asm-offsets.c
+++ b/arch/arm64/kernel/asm-offsets.c
@@ -139,6 +139,15 @@ int main(void)
DEFINE(ARM_SMCCC_RES_X2_OFFS, offsetof(struct arm_smccc_res, a2));
DEFINE(ARM_SMCCC_QUIRK_ID_OFFS, offsetof(struct arm_smccc_quirk, id));
DEFINE(ARM_SMCCC_QUIRK_STATE_OFFS, offsetof(struct arm_smccc_quirk, state));
+ DEFINE(ARM_SMCCC_1_2_REGS_X0_OFFS, offsetof(struct arm_smccc_1_2_regs, a0));
+ DEFINE(ARM_SMCCC_1_2_REGS_X2_OFFS, offsetof(struct arm_smccc_1_2_regs, a2));
+ DEFINE(ARM_SMCCC_1_2_REGS_X4_OFFS, offsetof(struct arm_smccc_1_2_regs, a4));
+ DEFINE(ARM_SMCCC_1_2_REGS_X6_OFFS, offsetof(struct arm_smccc_1_2_regs, a6));
+ DEFINE(ARM_SMCCC_1_2_REGS_X8_OFFS, offsetof(struct arm_smccc_1_2_regs, a8));
+ DEFINE(ARM_SMCCC_1_2_REGS_X10_OFFS, offsetof(struct arm_smccc_1_2_regs, a10));
+ DEFINE(ARM_SMCCC_1_2_REGS_X12_OFFS, offsetof(struct arm_smccc_1_2_regs, a12));
+ DEFINE(ARM_SMCCC_1_2_REGS_X14_OFFS, offsetof(struct arm_smccc_1_2_regs, a14));
+ DEFINE(ARM_SMCCC_1_2_REGS_X16_OFFS, offsetof(struct arm_smccc_1_2_regs, a16));
BLANK();
DEFINE(HIBERN_PBE_ORIG, offsetof(struct pbe, orig_address));
DEFINE(HIBERN_PBE_ADDR, offsetof(struct pbe, address));
diff --git a/arch/arm64/kernel/smccc-call.S b/arch/arm64/kernel/smccc-call.S
index d62447964ed9..2def9d0dd3dd 100644
--- a/arch/arm64/kernel/smccc-call.S
+++ b/arch/arm64/kernel/smccc-call.S
@@ -43,3 +43,60 @@ SYM_FUNC_START(__arm_smccc_hvc)
SMCCC hvc
SYM_FUNC_END(__arm_smccc_hvc)
EXPORT_SYMBOL(__arm_smccc_hvc)
+
+ .macro SMCCC_1_2 instr
+ /* Save `res` and free a GPR that won't be clobbered */
+ stp x1, x19, [sp, #-16]!
+
+ /* Ensure `args` won't be clobbered while loading regs in next step */
+ mov x19, x0
+
+ /* Load the registers x0 - x17 from the struct arm_smccc_1_2_regs */
+ ldp x0, x1, [x19, #ARM_SMCCC_1_2_REGS_X0_OFFS]
+ ldp x2, x3, [x19, #ARM_SMCCC_1_2_REGS_X2_OFFS]
+ ldp x4, x5, [x19, #ARM_SMCCC_1_2_REGS_X4_OFFS]
+ ldp x6, x7, [x19, #ARM_SMCCC_1_2_REGS_X6_OFFS]
+ ldp x8, x9, [x19, #ARM_SMCCC_1_2_REGS_X8_OFFS]
+ ldp x10, x11, [x19, #ARM_SMCCC_1_2_REGS_X10_OFFS]
+ ldp x12, x13, [x19, #ARM_SMCCC_1_2_REGS_X12_OFFS]
+ ldp x14, x15, [x19, #ARM_SMCCC_1_2_REGS_X14_OFFS]
+ ldp x16, x17, [x19, #ARM_SMCCC_1_2_REGS_X16_OFFS]
+
+ \instr #0
+
+ /* Load the `res` from the stack */
+ ldr x19, [sp]
+
+ /* Store the registers x0 - x17 into the result structure */
+ stp x0, x1, [x19, #ARM_SMCCC_1_2_REGS_X0_OFFS]
+ stp x2, x3, [x19, #ARM_SMCCC_1_2_REGS_X2_OFFS]
+ stp x4, x5, [x19, #ARM_SMCCC_1_2_REGS_X4_OFFS]
+ stp x6, x7, [x19, #ARM_SMCCC_1_2_REGS_X6_OFFS]
+ stp x8, x9, [x19, #ARM_SMCCC_1_2_REGS_X8_OFFS]
+ stp x10, x11, [x19, #ARM_SMCCC_1_2_REGS_X10_OFFS]
+ stp x12, x13, [x19, #ARM_SMCCC_1_2_REGS_X12_OFFS]
+ stp x14, x15, [x19, #ARM_SMCCC_1_2_REGS_X14_OFFS]
+ stp x16, x17, [x19, #ARM_SMCCC_1_2_REGS_X16_OFFS]
+
+ /* Restore original x19 */
+ ldp xzr, x19, [sp], #16
+ ret
+.endm
+
+/*
+ * void arm_smccc_1_2_hvc(const struct arm_smccc_1_2_regs *args,
+ * struct arm_smccc_1_2_regs *res);
+ */
+SYM_FUNC_START(arm_smccc_1_2_hvc)
+ SMCCC_1_2 hvc
+SYM_FUNC_END(arm_smccc_1_2_hvc)
+EXPORT_SYMBOL(arm_smccc_1_2_hvc)
+
+/*
+ * void arm_smccc_1_2_smc(const struct arm_smccc_1_2_regs *args,
+ * struct arm_smccc_1_2_regs *res);
+ */
+SYM_FUNC_START(arm_smccc_1_2_smc)
+ SMCCC_1_2 smc
+SYM_FUNC_END(arm_smccc_1_2_smc)
+EXPORT_SYMBOL(arm_smccc_1_2_smc)
diff --git a/drivers/firmware/Kconfig b/drivers/firmware/Kconfig
index bfef3d8d14e7..90e6dd32f2cd 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 523173cbff33..3c2af2e98def 100644
--- a/drivers/firmware/Makefile
+++ b/drivers/firmware/Makefile
@@ -23,6 +23,7 @@ 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..fca1e311ea6c
--- /dev/null
+++ b/drivers/firmware/arm_ffa/bus.c
@@ -0,0 +1,220 @@
+// 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);
+
+ return ffa_drv->probe(ffa_dev);
+}
+
+static int ffa_device_remove(struct device *dev)
+{
+ struct ffa_driver *ffa_drv = to_ffa_driver(dev->driver);
+
+ ffa_drv->remove(to_ffa_dev(dev));
+
+ return 0;
+}
+
+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,
+ .remove = ffa_device_remove,
+ .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;
+
+ if (!driver->probe)
+ return -EINVAL;
+
+ 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)
+{
+ device_unregister(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..14f900047ac0
--- /dev/null
+++ b/drivers/firmware/arm_ffa/driver.c
@@ -0,0 +1,776 @@
+// 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)
+{
+ int err_idx = -errno;
+
+ if (err_idx >= 0 && err_idx < ARRAY_SIZE(ffa_linux_errmap))
+ return ffa_linux_errmap[err_idx];
+ 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;
+
+/*
+ * The driver must be able to support all the versions from the earliest
+ * supported FFA_MIN_VERSION to the latest supported FFA_DRIVER_VERSION.
+ * The specification states that if firmware supports a FFA implementation
+ * that is incompatible with and at a greater version number than specified
+ * by the caller(FFA_DRIVER_VERSION passed as parameter to FFA_VERSION),
+ * it must return the NOT_SUPPORTED error code.
+ */
+static u32 ffa_compatible_version_find(u32 version)
+{
+ u16 major = MAJOR_VERSION(version), minor = MINOR_VERSION(version);
+ u16 drv_major = MAJOR_VERSION(FFA_DRIVER_VERSION);
+ u16 drv_minor = MINOR_VERSION(FFA_DRIVER_VERSION);
+
+ if ((major < drv_major) || (major == drv_major && minor <= drv_minor))
+ return version;
+
+ pr_info("Firmware version higher than driver version, downgrading\n");
+ return FFA_DRIVER_VERSION;
+}
+
+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) {
+ pr_err("Incompatible v%d.%d! Earliest supported v%d.%d\n",
+ MAJOR_VERSION(ver.a0), MINOR_VERSION(ver.a0),
+ MAJOR_VERSION(FFA_MIN_VERSION),
+ MINOR_VERSION(FFA_MIN_VERSION));
+ return -EINVAL;
+ }
+
+ pr_info("Driver version %d.%d\n", MAJOR_VERSION(FFA_DRIVER_VERSION),
+ MINOR_VERSION(FFA_DRIVER_VERSION));
+ pr_info("Firmware version %d.%d found\n", MAJOR_VERSION(ver.a0),
+ MINOR_VERSION(ver.a0));
+ *version = ffa_compatible_version_find(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 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;
+ }
+
+ 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;
+}
diff --git a/include/linux/arm-smccc.h b/include/linux/arm-smccc.h
index 62c54234576c..c8eb24af3c62 100644
--- a/include/linux/arm-smccc.h
+++ b/include/linux/arm-smccc.h
@@ -186,6 +186,61 @@ struct arm_smccc_res {
unsigned long a3;
};
+#ifdef CONFIG_ARM64
+/**
+ * struct arm_smccc_1_2_regs - Arguments for or Results from SMC/HVC call
+ * @a0-a17 argument values from registers 0 to 17
+ */
+struct arm_smccc_1_2_regs {
+ unsigned long a0;
+ unsigned long a1;
+ unsigned long a2;
+ unsigned long a3;
+ unsigned long a4;
+ unsigned long a5;
+ unsigned long a6;
+ unsigned long a7;
+ unsigned long a8;
+ unsigned long a9;
+ unsigned long a10;
+ unsigned long a11;
+ unsigned long a12;
+ unsigned long a13;
+ unsigned long a14;
+ unsigned long a15;
+ unsigned long a16;
+ unsigned long a17;
+};
+
+/**
+ * arm_smccc_1_2_hvc() - make HVC calls
+ * @args: arguments passed via struct arm_smccc_1_2_regs
+ * @res: result values via struct arm_smccc_1_2_regs
+ *
+ * This function is used to make HVC calls following SMC Calling Convention
+ * v1.2 or above. The content of the supplied param are copied from the
+ * structure to registers prior to the HVC instruction. The return values
+ * are updated with the content from registers on return from the HVC
+ * instruction.
+ */
+asmlinkage void arm_smccc_1_2_hvc(const struct arm_smccc_1_2_regs *args,
+ struct arm_smccc_1_2_regs *res);
+
+/**
+ * arm_smccc_1_2_smc() - make SMC calls
+ * @args: arguments passed via struct arm_smccc_1_2_regs
+ * @res: result values via struct arm_smccc_1_2_regs
+ *
+ * This function is used to make SMC calls following SMC Calling Convention
+ * v1.2 or above. The content of the supplied param are copied from the
+ * structure to registers prior to the SMC instruction. The return values
+ * are updated with the content from registers on return from the SMC
+ * instruction.
+ */
+asmlinkage void arm_smccc_1_2_smc(const struct arm_smccc_1_2_regs *args,
+ struct arm_smccc_1_2_regs *res);
+#endif
+
/**
* struct arm_smccc_quirk - Contains quirk information
* @id: quirk identification
diff --git a/include/linux/arm_ffa.h b/include/linux/arm_ffa.h
new file mode 100644
index 000000000000..85651e41ded8
--- /dev/null
+++ b/include/linux/arm_ffa.h
@@ -0,0 +1,269 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (C) 2021 ARM Ltd.
+ */
+
+#ifndef _LINUX_ARM_FFA_H
+#define _LINUX_ARM_FFA_H
+
+#include <linux/device.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/uuid.h>
+
+/* FFA Bus/Device/Driver related */
+struct ffa_device {
+ int vm_id;
+ bool mode_32bit;
+ uuid_t uuid;
+ struct device dev;
+};
+
+#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(d, struct ffa_driver, driver)
+
+static inline void ffa_dev_set_drvdata(struct ffa_device *fdev, void *data)
+{
+ fdev->dev.driver_data = data;
+}
+
+#if IS_REACHABLE(CONFIG_ARM_FFA_TRANSPORT)
+struct ffa_device *ffa_device_register(const uuid_t *uuid, int vm_id);
+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);
+const struct ffa_dev_ops *ffa_dev_ops_get(struct ffa_device *dev);
+
+#else
+static inline
+struct ffa_device *ffa_device_register(const uuid_t *uuid, int vm_id)
+{
+ 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; }
+
+static inline
+const struct ffa_dev_ops *ffa_dev_ops_get(struct ffa_device *dev)
+{
+ return NULL;
+}
+#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)
+
+/* 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)
+ u32 properties;
+};
+
+/* 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_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;
+ u32 composite_off;
+ /*
+ * Offset in bytes from the start of the outer `ffa_memory_region` to
+ * an `struct ffa_mem_region_addr_range`.
+ */
+ 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)
+ u8 attributes;
+ u8 reserved_0;
+/*
+ * 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;
+ u32 reserved_1;
+ /*
+ * The number of `ffa_mem_region_attributes` entries included in this
+ * transaction.
+ */
+ u32 ep_count;
+ /*
+ * An array of endpoint memory access descriptors.
+ * Each one specifies a memory region offset, an endpoint and the
+ * attributes with which this memory region should be mapped in that
+ * endpoint's page table.
+ */
+ struct ffa_mem_region_attributes ep_mem_access[];
+};
+
+#define COMPOSITE_OFFSET(x) \
+ (offsetof(struct ffa_mem_region, ep_mem_access[x]))
+#define CONSTITUENTS_OFFSET(x) \
+ (offsetof(struct ffa_composite_mem_region, constituents[x]))
+#define COMPOSITE_CONSTITUENTS_OFFSET(x, y) \
+ (COMPOSITE_OFFSET(x) + CONSTITUENTS_OFFSET(y))
+
+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_dev_ops {
+ u32 (*api_version_get)(void);
+ int (*partition_info_get)(const char *uuid_str,
+ struct ffa_partition_info *buffer);
+ void (*mode_32bit_set)(struct ffa_device *dev);
+ int (*sync_send_receive)(struct ffa_device *dev,
+ struct ffa_send_direct_data *data);
+ int (*memory_reclaim)(u64 g_handle, u32 flags);
+ int (*memory_share)(struct ffa_device *dev,
+ struct ffa_mem_ops_args *args);
+ int (*memory_lend)(struct ffa_device *dev,
+ struct ffa_mem_ops_args *args);
+};
+
+#endif /* _LINUX_ARM_FFA_H */
--
2.30.2
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