[PATCH v6 0/6] firmware: Add initial support for Arm FF-A

[PATCH v6 0/6] firmware: Add initial support for Arm FF-A

[Sudeep Holla]

Hi all,

This is very basic implementation for in-kernel support for Arm FF-A
specification.

Arm Firmware Framework for Armv8-A specification[1] describes a software
architecture that provides mechanism to utilise the virtualization
extension to isolate software images and describes interfaces that
standardize communication between the various software images. This
includes communication between images in the Secure and Normal world.

The main idea here is to create FFA device to establish any communication
with a secure partition. This is currently tested with OPTEE(with changes
to OPTEE driver adding FFA as transport)

The series can be fetched from [2]

--
Regards,
Sudeep

[1] https://developer.arm.com/documentation/den0077/latest
[2] git://git.kerniel.org/pub/scm/linux/kernel/git/sudeep.holla/linux.git v5.13/ffa


v5->v6:
	- Dropped DT dependecy completely and use the discovery APIs for
	  adding FFA partitions on the bus. They is some workaround added
	  as v1.0 doesn't provide UUID as part of the discovery APIs which
	  is used to match the devices and driver on FFA bus.
	- Extended SMCCC v1.2 API to support full set of input and output
	  registers.
	- Couple of minor bug fixes found as part of testing

v4->v5:
	- Fixed couple of comments in DT bindings
	- Moved to use native version of RXTX_MAP call, fixed vm_id param
	  to RXTX_UNMAP, dropped couple of unused confusingly named macros
	  (can be added back with correct name when we need to use them)

v3->v4:
	- Added support to allow partitions to set 32bit only mode
	- Addressed all the comments from Jens Wiklander

v2->v3:
	- Dropped hypervisor partitions and userspace support as it is
	  no longer in the list of requirements
	- Moved away from ioctl style interface for in-kernel users as
	  there is no need to keep in sync with userspace anymore
	- Some kerneldoc fixes as pointed out in earlier reviews

v1->v2:
	- Moved userspace code to a separate unit, will move to separate
	  module. Still working on minimizing initcall dependencies and
	  exported functions to reuse some of the code.
	- Fixed couple of minor issues pointed out
	- Dropped ASYNC send message as I haven't been able to test

Sudeep Holla (6):
  arm64: smccc: Add support for SMCCCv1.2 extended input/output registers
  firmware: arm_ffa: Add initial FFA bus support for device enumeration
  firmware: arm_ffa: Add initial Arm FFA driver support
  firmware: arm_ffa: Add support for SMCCC as transport to FFA driver
  firmware: arm_ffa: Setup in-kernel users of FFA partitions
  firmware: arm_ffa: Add support for MEM_* interfaces

 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    | 210 +++++++++
 drivers/firmware/arm_ffa/common.h |  31 ++
 drivers/firmware/arm_ffa/driver.c | 719 ++++++++++++++++++++++++++++++
 drivers/firmware/arm_ffa/smccc.c  |  39 ++
 include/linux/arm-smccc.h         |  55 +++
 include/linux/arm_ffa.h           | 266 +++++++++++
 13 files changed, 1422 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

-- 
2.25.1


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[PATCH v6 1/6] arm64: smccc: Add support for SMCCCv1.2 extended input/output registers

[Sudeep Holla]

SMCCC v1.2 allows x8-x17 to be used as parameter registers and x4—x17
to be used as result registers in SMC64/HVC64. Arm Firmware Framework
for Armv8-A specification makes use of x0-x7 as parameter and result
registers. There are other users like Hyper-V who intend to use beyond
x0-x7 as well.

Current SMCCC interface in the kernel just use x0-x7 as parameter and
x0-x3 as result registers as required by SMCCCv1.0. Let us add new
interface to support this extended set of input/output registers namely
x0-x17 as both parameter and result registers.

Cc: Michael Kelley <mikelley@microsoft.com>
Cc: Will Deacon <will@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc:Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
---
 arch/arm64/kernel/asm-offsets.c |  9 ++++++
 arch/arm64/kernel/smccc-call.S  | 57 +++++++++++++++++++++++++++++++++
 include/linux/arm-smccc.h       | 55 +++++++++++++++++++++++++++++++
 3 files changed, 121 insertions(+)

diff --git a/arch/arm64/kernel/asm-offsets.c b/arch/arm64/kernel/asm-offsets.c
index 0cb34ccb6e73..74321bc9a459 100644
--- a/arch/arm64/kernel/asm-offsets.c
+++ b/arch/arm64/kernel/asm-offsets.c
@@ -138,6 +138,15 @@ 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..7d79c5062c5d 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(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(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/include/linux/arm-smccc.h b/include/linux/arm-smccc.h
index 6861489a1890..a9e0a6d68754 100644
--- a/include/linux/arm-smccc.h
+++ b/include/linux/arm-smccc.h
@@ -227,6 +227,61 @@ 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(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(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
-- 
2.25.1


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[PATCH v6 2/6] firmware: arm_ffa: Add initial FFA bus support for device enumeration

[Sudeep Holla]

The Arm FF for Armv8-A specification has concept of endpoints or
partitions. In the Normal world, a partition could be a VM when
the Virtualization extension is enabled or the kernel itself.

In order to handle multiple partitions, we can create a FFA device for
each such partition on a dedicated FFA bus. Similarly, different drivers
requiring FFA transport can be registered on the same bus. We can match
the device and drivers using UUID. This is mostly for the in-kernel
users with FFA drivers.

Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
---
 MAINTAINERS                       |   7 +
 drivers/firmware/Kconfig          |   1 +
 drivers/firmware/Makefile         |   1 +
 drivers/firmware/arm_ffa/Kconfig  |  16 +++
 drivers/firmware/arm_ffa/Makefile |   4 +
 drivers/firmware/arm_ffa/bus.c    | 207 ++++++++++++++++++++++++++++++
 include/linux/arm_ffa.h           |  91 +++++++++++++
 7 files changed, 327 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 include/linux/arm_ffa.h

diff --git a/MAINTAINERS b/MAINTAINERS
index 121b1a12384a..88a988e08d11 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -7052,6 +7052,13 @@ 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/drivers/firmware/Kconfig b/drivers/firmware/Kconfig
index db0ea2d2d75a..b53ac9fc7704 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..261a3660650a
--- /dev/null
+++ b/drivers/firmware/arm_ffa/Kconfig
@@ -0,0 +1,16 @@
+# 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.
diff --git a/drivers/firmware/arm_ffa/Makefile b/drivers/firmware/arm_ffa/Makefile
new file mode 100644
index 000000000000..bfe4323a8784
--- /dev/null
+++ b/drivers/firmware/arm_ffa/Makefile
@@ -0,0 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0-only
+ffa-bus-y = bus.o
+ffa-module-objs := $(ffa-bus-y)
+obj-$(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..b743fb2256e9
--- /dev/null
+++ b/drivers/firmware/arm_ffa/bus.c
@@ -0,0 +1,207 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2020 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>
+
+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)) {
+		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);
+
+static int __init arm_ffa_bus_init(void)
+{
+	return bus_register(&ffa_bus_type);
+}
+module_init(arm_ffa_bus_init);
+
+static void __exit arm_ffa_bus_exit(void)
+{
+	ffa_devices_unregister();
+	bus_unregister(&ffa_bus_type);
+}
+
+module_exit(arm_ffa_bus_exit);
+
+MODULE_ALIAS("arm-ffa-bus");
+MODULE_AUTHOR("Sudeep Holla <sudeep.holla@arm.com>");
+MODULE_DESCRIPTION("Arm FF-A bus driver");
+MODULE_LICENSE("GPL v2");
diff --git a/include/linux/arm_ffa.h b/include/linux/arm_ffa.h
new file mode 100644
index 000000000000..aaff89364541
--- /dev/null
+++ b/include/linux/arm_ffa.h
@@ -0,0 +1,91 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (C) 2020 ARM Ltd.
+ */
+
+#ifndef _LINUX_ARM_FFA_H
+#define _LINUX_ARM_FFA_H
+
+#include <linux/cdev.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;
+	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);
+
+#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; }
+
+#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)
+
+#endif /* _LINUX_ARM_FFA_H */
-- 
2.25.1


_______________________________________________
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http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

[PATCH v6 3/6] firmware: arm_ffa: Add initial Arm FFA driver support

[Sudeep Holla]

This just add a basic driver that sets up the transport(e.g. SMCCC),
checks the FFA version implemented, get the partition ID for self and
sets up the Tx/Rx buffers for communication.

Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
---
 drivers/firmware/arm_ffa/Makefile |   3 +-
 drivers/firmware/arm_ffa/bus.c    |  14 +-
 drivers/firmware/arm_ffa/common.h |  24 +++
 drivers/firmware/arm_ffa/driver.c | 307 ++++++++++++++++++++++++++++++
 4 files changed, 337 insertions(+), 11 deletions(-)
 create mode 100644 drivers/firmware/arm_ffa/common.h
 create mode 100644 drivers/firmware/arm_ffa/driver.c

diff --git a/drivers/firmware/arm_ffa/Makefile b/drivers/firmware/arm_ffa/Makefile
index bfe4323a8784..82d0d35c5324 100644
--- a/drivers/firmware/arm_ffa/Makefile
+++ b/drivers/firmware/arm_ffa/Makefile
@@ -1,4 +1,5 @@
 # SPDX-License-Identifier: GPL-2.0-only
 ffa-bus-y = bus.o
-ffa-module-objs := $(ffa-bus-y)
+ffa-driver-y = driver.o
+ffa-module-objs := $(ffa-bus-y) $(ffa-driver-y)
 obj-$(CONFIG_ARM_FFA_TRANSPORT) = ffa-module.o
diff --git a/drivers/firmware/arm_ffa/bus.c b/drivers/firmware/arm_ffa/bus.c
index b743fb2256e9..58441266e60d 100644
--- a/drivers/firmware/arm_ffa/bus.c
+++ b/drivers/firmware/arm_ffa/bus.c
@@ -13,6 +13,8 @@
 #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;
@@ -187,21 +189,13 @@ void ffa_device_unregister(struct ffa_device *ffa_dev)
 }
 EXPORT_SYMBOL_GPL(ffa_device_unregister);
 
-static int __init arm_ffa_bus_init(void)
+int __init arm_ffa_bus_init(void)
 {
 	return bus_register(&ffa_bus_type);
 }
-module_init(arm_ffa_bus_init);
 
-static void __exit arm_ffa_bus_exit(void)
+void __exit arm_ffa_bus_exit(void)
 {
 	ffa_devices_unregister();
 	bus_unregister(&ffa_bus_type);
 }
-
-module_exit(arm_ffa_bus_exit);
-
-MODULE_ALIAS("arm-ffa-bus");
-MODULE_AUTHOR("Sudeep Holla <sudeep.holla@arm.com>");
-MODULE_DESCRIPTION("Arm FF-A bus driver");
-MODULE_LICENSE("GPL v2");
diff --git a/drivers/firmware/arm_ffa/common.h b/drivers/firmware/arm_ffa/common.h
new file mode 100644
index 000000000000..9195f66f826c
--- /dev/null
+++ b/drivers/firmware/arm_ffa/common.h
@@ -0,0 +1,24 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2020 ARM Ltd.
+ */
+
+#ifndef _FFA_COMMON_H
+#define _FFA_COMMON_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 __init arm_ffa_bus_init(void);
+void __exit arm_ffa_bus_exit(void);
+
+static inline int __init ffa_transport_init(ffa_fn **invoke_ffa_fn)
+{
+	return -EOPNOTSUPP;
+}
+
+#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..d74f03b773d2
--- /dev/null
+++ b/drivers/firmware/arm_ffa/driver.c
@@ -0,0 +1,307 @@
+// 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) 2020 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/io.h>
+#include <linux/module.h>
+#include <linux/slab.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_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;
+}
+
+#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 __init ffa_init(void)
+{
+	int ret;
+
+	ret = arm_ffa_bus_init();
+	if (ret)
+		return ret;
+
+	ret = ffa_transport_init(&invoke_ffa_fn);
+	if (ret)
+		return ret;
+
+	drv_info = kzalloc(sizeof(*drv_info), GFP_KERNEL);
+	if (!drv_info)
+		return -ENOMEM;
+
+	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);
+
+	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);
+	return ret;
+}
+module_init(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");
-- 
2.25.1


_______________________________________________
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[PATCH v6 4/6] firmware: arm_ffa: Add support for SMCCC as transport to FFA driver

[Sudeep Holla]

There are requests to keep the transport separate in order to allow
other possible transports like virtio. So let us keep the SMCCC transport
specific routines abstracted.

It is kept simple for now. Once we add another transport, we can develop
better abstraction.

Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
---
 drivers/firmware/arm_ffa/Kconfig  |  5 ++++
 drivers/firmware/arm_ffa/Makefile |  3 ++-
 drivers/firmware/arm_ffa/common.h |  4 ++++
 drivers/firmware/arm_ffa/smccc.c  | 39 +++++++++++++++++++++++++++++++
 4 files changed, 50 insertions(+), 1 deletion(-)
 create mode 100644 drivers/firmware/arm_ffa/smccc.c

diff --git a/drivers/firmware/arm_ffa/Kconfig b/drivers/firmware/arm_ffa/Kconfig
index 261a3660650a..5e3ae5cf82e8 100644
--- a/drivers/firmware/arm_ffa/Kconfig
+++ b/drivers/firmware/arm_ffa/Kconfig
@@ -14,3 +14,8 @@ config ARM_FFA_TRANSPORT
 
 	  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
index 82d0d35c5324..9d9f37523200 100644
--- a/drivers/firmware/arm_ffa/Makefile
+++ b/drivers/firmware/arm_ffa/Makefile
@@ -1,5 +1,6 @@
 # SPDX-License-Identifier: GPL-2.0-only
 ffa-bus-y = bus.o
 ffa-driver-y = driver.o
-ffa-module-objs := $(ffa-bus-y) $(ffa-driver-y)
+ffa-transport-$(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/common.h b/drivers/firmware/arm_ffa/common.h
index 9195f66f826c..842451666827 100644
--- a/drivers/firmware/arm_ffa/common.h
+++ b/drivers/firmware/arm_ffa/common.h
@@ -16,9 +16,13 @@ typedef void (ffa_fn)(ffa_value_t, ffa_value_t *);
 int __init arm_ffa_bus_init(void);
 void __exit arm_ffa_bus_exit(void);
 
+#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/smccc.c b/drivers/firmware/arm_ffa/smccc.c
new file mode 100644
index 000000000000..22c34b788769
--- /dev/null
+++ b/drivers/firmware/arm_ffa/smccc.c
@@ -0,0 +1,39 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2020 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;
+}
-- 
2.25.1


_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

[PATCH v6 5/6] firmware: arm_ffa: Setup in-kernel users of FFA partitions

[Sudeep Holla]

Parse the FFA nodes from the device-tree and register all the partitions
whose services will be used in the kernel.

In order to also enable in-kernel users of FFA interface, let us add
simple set of operations for such devices.

The in-kernel users are registered without the character device interface.

Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
---
 drivers/firmware/arm_ffa/bus.c    |   9 ++
 drivers/firmware/arm_ffa/common.h |   3 +
 drivers/firmware/arm_ffa/driver.c | 213 ++++++++++++++++++++++++++++++
 include/linux/arm_ffa.h           |  38 +++++-
 4 files changed, 262 insertions(+), 1 deletion(-)

diff --git a/drivers/firmware/arm_ffa/bus.c b/drivers/firmware/arm_ffa/bus.c
index 58441266e60d..da23100c2e39 100644
--- a/drivers/firmware/arm_ffa/bus.c
+++ b/drivers/firmware/arm_ffa/bus.c
@@ -24,6 +24,15 @@ static int ffa_device_match(struct device *dev, struct device_driver *drv)
 	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++;
diff --git a/drivers/firmware/arm_ffa/common.h b/drivers/firmware/arm_ffa/common.h
index 842451666827..80ad71f02235 100644
--- a/drivers/firmware/arm_ffa/common.h
+++ b/drivers/firmware/arm_ffa/common.h
@@ -6,6 +6,7 @@
 #ifndef _FFA_COMMON_H
 #define _FFA_COMMON_H
 
+#include <linux/arm_ffa.h>
 #include <linux/arm-smccc.h>
 #include <linux/err.h>
 
@@ -15,6 +16,8 @@ typedef void (ffa_fn)(ffa_value_t, ffa_value_t *);
 
 int __init arm_ffa_bus_init(void);
 void __exit 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);
diff --git a/drivers/firmware/arm_ffa/driver.c b/drivers/firmware/arm_ffa/driver.c
index d74f03b773d2..cefbb3edf142 100644
--- a/drivers/firmware/arm_ffa/driver.c
+++ b/drivers/firmware/arm_ffa/driver.c
@@ -24,9 +24,12 @@
 
 #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/slab.h>
+#include <linux/uuid.h>
 
 #include "common.h"
 
@@ -185,6 +188,22 @@ static int ffa_version_check(u32 *version)
 	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;
@@ -214,6 +233,64 @@ static int ffa_rxtx_unmap(u16 vm_id)
 	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);
+
+	*buffer = pbuf;
+	return count;
+}
+
 #define VM_ID_MASK	GENMASK(15, 0)
 static int ffa_id_get(u16 *vm_id)
 {
@@ -231,6 +308,140 @@ static int ffa_id_get(u16 *vm_id)
 	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 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 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,
+};
+
+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++) {
+		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;
@@ -280,6 +491,8 @@ static int __init ffa_init(void)
 	mutex_init(&drv_info->rx_lock);
 	mutex_init(&drv_info->tx_lock);
 
+	ffa_setup_partitions();
+
 	return 0;
 free_pages:
 	if (drv_info->tx_buffer)
diff --git a/include/linux/arm_ffa.h b/include/linux/arm_ffa.h
index aaff89364541..b242fbbce4f0 100644
--- a/include/linux/arm_ffa.h
+++ b/include/linux/arm_ffa.h
@@ -6,7 +6,6 @@
 #ifndef _LINUX_ARM_FFA_H
 #define _LINUX_ARM_FFA_H
 
-#include <linux/cdev.h>
 #include <linux/device.h>
 #include <linux/module.h>
 #include <linux/types.h>
@@ -15,6 +14,7 @@
 /* FFA Bus/Device/Driver related */
 struct ffa_device {
 	int vm_id;
+	bool mode_32bit;
 	uuid_t uuid;
 	struct device dev;
 };
@@ -48,6 +48,7 @@ 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
@@ -70,6 +71,10 @@ static inline void ffa_driver_unregister(struct ffa_driver *driver) {}
 static inline
 bool ffa_device_is_valid(struct ffa_device *ffa_dev) { return false; }
 
+const struct ffa_dev_ops *ffa_dev_ops_get(struct ffa_device *dev)
+{
+	return NULL;
+}
 #endif /* CONFIG_ARM_FFA_TRANSPORT */
 
 #define ffa_register(driver) \
@@ -88,4 +93,35 @@ bool ffa_device_is_valid(struct ffa_device *ffa_dev) { return false; }
 #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_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);
+};
+
 #endif /* _LINUX_ARM_FFA_H */
-- 
2.25.1


_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

[PATCH v6 6/6] firmware: arm_ffa: Add support for MEM_* interfaces

[Sudeep Holla]

Most of the MEM_* APIs share the same parameters, so they can be
generalised. Currently only MEM_SHARE is implemented and the user space
interface for that is not added yet.

Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
---
 drivers/firmware/arm_ffa/driver.c | 199 ++++++++++++++++++++++++++++++
 include/linux/arm_ffa.h           | 139 +++++++++++++++++++++
 2 files changed, 338 insertions(+)

diff --git a/drivers/firmware/arm_ffa/driver.c b/drivers/firmware/arm_ffa/driver.c
index cefbb3edf142..056a3fca14d1 100644
--- a/drivers/firmware/arm_ffa/driver.c
+++ b/drivers/firmware/arm_ffa/driver.c
@@ -28,6 +28,8 @@
 #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>
 
@@ -348,6 +350,192 @@ static int ffa_msg_send_direct_req(u16 src_id, u16 dst_id, bool mode_32bit,
 	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;
@@ -386,11 +574,22 @@ static int ffa_sync_send_receive(struct ffa_device *dev,
 				       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)
diff --git a/include/linux/arm_ffa.h b/include/linux/arm_ffa.h
index b242fbbce4f0..6dc0f4e425b9 100644
--- a/include/linux/arm_ffa.h
+++ b/include/linux/arm_ffa.h
@@ -115,6 +115,142 @@ struct ffa_send_direct_data {
 	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,
@@ -122,6 +258,9 @@ struct ffa_dev_ops {
 	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);
 };
 
 #endif /* _LINUX_ARM_FFA_H */
-- 
2.25.1


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Re: [PATCH v6 1/6] arm64: smccc: Add support for SMCCCv1.2 extended input/output registers

[Mark Rutland]

Hi Sudeep,

On Wed, May 05, 2021 at 10:38:38AM +0100, Sudeep Holla wrote:
> SMCCC v1.2 allows x8-x17 to be used as parameter registers and x4—x17
> to be used as result registers in SMC64/HVC64. Arm Firmware Framework
> for Armv8-A specification makes use of x0-x7 as parameter and result
> registers. There are other users like Hyper-V who intend to use beyond
> x0-x7 as well.
> 
> Current SMCCC interface in the kernel just use x0-x7 as parameter and
> x0-x3 as result registers as required by SMCCCv1.0. Let us add new
> interface to support this extended set of input/output registers namely
> x0-x17 as both parameter and result registers.
> 
> Cc: Michael Kelley <mikelley@microsoft.com>
> Cc: Will Deacon <will@kernel.org>
> Cc: Mark Rutland <mark.rutland@arm.com>
> Cc:Catalin Marinas <catalin.marinas@arm.com>
> Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>

I have one minor comment below, otherwise this looks good to me, and
regardless:

Acked-by: Mark Rutland <mark.rutland@arm.com>

[...]

> +/**
> + * 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(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(struct arm_smccc_1_2_regs *args,
> +				  struct arm_smccc_1_2_regs *res);
> +#endif

It might be worth making the args parameter to these const, since we
never write to it in the asm.

Thanks,
Mark.

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RE: [PATCH v6 1/6] arm64: smccc: Add support for SMCCCv1.2 extended input/output registers

[Michael Kelley]

From: Sudeep Holla <sudeep.holla@arm.com> Sent: Wednesday, May 5, 2021 2:39 AM
> 
> SMCCC v1.2 allows x8-x17 to be used as parameter registers and x4—x17
> to be used as result registers in SMC64/HVC64. Arm Firmware Framework
> for Armv8-A specification makes use of x0-x7 as parameter and result
> registers. There are other users like Hyper-V who intend to use beyond
> x0-x7 as well.
> 
> Current SMCCC interface in the kernel just use x0-x7 as parameter and
> x0-x3 as result registers as required by SMCCCv1.0. Let us add new
> interface to support this extended set of input/output registers namely
> x0-x17 as both parameter and result registers.
> 
> Cc: Michael Kelley <mikelley@microsoft.com>
> Cc: Will Deacon <will@kernel.org>
> Cc: Mark Rutland <mark.rutland@arm.com>
> Cc:Catalin Marinas <catalin.marinas@arm.com>
> Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
> ---
>  arch/arm64/kernel/asm-offsets.c |  9 ++++++
>  arch/arm64/kernel/smccc-call.S  | 57 +++++++++++++++++++++++++++++++++
>  include/linux/arm-smccc.h       | 55 +++++++++++++++++++++++++++++++
>  3 files changed, 121 insertions(+)
> 
> diff --git a/arch/arm64/kernel/asm-offsets.c b/arch/arm64/kernel/asm-offsets.c
> index 0cb34ccb6e73..74321bc9a459 100644
> --- a/arch/arm64/kernel/asm-offsets.c
> +++ b/arch/arm64/kernel/asm-offsets.c
> @@ -138,6 +138,15 @@ 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..7d79c5062c5d 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(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)

I've tested the new arm_smccc_1_2_hvc() function in the context
of Linux guests making hypercalls on Hyper-V for ARM64, and it
works as intended.   But note that my test case only uses X0 thru X7.

Tested-by: Michael Kelley <mikelley@microsoft.com>
Reviewed-by: Michael Kelley <mikelley@microsoft.com>
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Re: [PATCH v6 1/6] arm64: smccc: Add support for SMCCCv1.2 extended input/output registers

[Sudeep Holla]

On Wed, May 05, 2021 at 02:49:14PM +0100, Mark Rutland wrote:
> Hi Sudeep,
> 
> On Wed, May 05, 2021 at 10:38:38AM +0100, Sudeep Holla wrote:
> > SMCCC v1.2 allows x8-x17 to be used as parameter registers and x4—x17
> > to be used as result registers in SMC64/HVC64. Arm Firmware Framework
> > for Armv8-A specification makes use of x0-x7 as parameter and result
> > registers. There are other users like Hyper-V who intend to use beyond
> > x0-x7 as well.
> > 
> > Current SMCCC interface in the kernel just use x0-x7 as parameter and
> > x0-x3 as result registers as required by SMCCCv1.0. Let us add new
> > interface to support this extended set of input/output registers namely
> > x0-x17 as both parameter and result registers.
> > 
> > Cc: Michael Kelley <mikelley@microsoft.com>
> > Cc: Will Deacon <will@kernel.org>
> > Cc: Mark Rutland <mark.rutland@arm.com>
> > Cc:Catalin Marinas <catalin.marinas@arm.com>
> > Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
> 
> I have one minor comment below, otherwise this looks good to me, and
> regardless:
> 
> Acked-by: Mark Rutland <mark.rutland@arm.com>
> 
> [...]
> 
> > +/**
> > + * 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(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(struct arm_smccc_1_2_regs *args,
> > +				  struct arm_smccc_1_2_regs *res);
> > +#endif
> 
> It might be worth making the args parameter to these const, since we
> never write to it in the asm.
>

Makes sense, will fix it. Thanks for the review.

-- 
Regards,
Sudeep

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Re: [PATCH v6 1/6] arm64: smccc: Add support for SMCCCv1.2 extended input/output registers

[Sudeep Holla]

Hi Michael,

On Wed, May 05, 2021 at 03:28:56PM +0000, Michael Kelley wrote:
> From: Sudeep Holla <sudeep.holla@arm.com> Sent: Wednesday, May 5, 2021 2:39 AM
> > 
> > SMCCC v1.2 allows x8-x17 to be used as parameter registers and x4—x17
> > to be used as result registers in SMC64/HVC64. Arm Firmware Framework
> > for Armv8-A specification makes use of x0-x7 as parameter and result
> > registers. There are other users like Hyper-V who intend to use beyond
> > x0-x7 as well.
> > 
> > Current SMCCC interface in the kernel just use x0-x7 as parameter and
> > x0-x3 as result registers as required by SMCCCv1.0. Let us add new
> > interface to support this extended set of input/output registers namely
> > x0-x17 as both parameter and result registers.
> > 

[...]

> I've tested the new arm_smccc_1_2_hvc() function in the context
> of Linux guests making hypercalls on Hyper-V for ARM64, and it
> works as intended.   But note that my test case only uses X0 thru X7.
> 
> Tested-by: Michael Kelley <mikelley@microsoft.com>
> Reviewed-by: Michael Kelley <mikelley@microsoft.com>

Thanks!

-- 
Regards,
Sudeep

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Re: [PATCH v6 0/6] firmware: Add initial support for Arm FF-A

[Jens Wiklander]

On Wed, May 5, 2021 at 11:38 AM Sudeep Holla <sudeep.holla@arm.com> wrote:
>
> Hi all,
>
> This is very basic implementation for in-kernel support for Arm FF-A
> specification.
>
> Arm Firmware Framework for Armv8-A specification[1] describes a software
> architecture that provides mechanism to utilise the virtualization
> extension to isolate software images and describes interfaces that
> standardize communication between the various software images. This
> includes communication between images in the Secure and Normal world.
>
> The main idea here is to create FFA device to establish any communication
> with a secure partition. This is currently tested with OPTEE(with changes
> to OPTEE driver adding FFA as transport)
>
> The series can be fetched from [2]
>
> --
> Regards,
> Sudeep
>
> [1] https://developer.arm.com/documentation/den0077/latest
> [2] git://git.kerniel.org/pub/scm/linux/kernel/git/sudeep.holla/linux.git v5.13/ffa

Tested OK with my OP-TEE driver patches on top of 755e78187c4e
("firmware: arm_ffa: Add support for MEM_* interfaces"), which is the
latest on the v5.13/ffa branch above.

Tested-by: Jens Wiklander <jens.wiklander@linaro.org>

Cheers,
Jens


>
>
> v5->v6:
>         - Dropped DT dependecy completely and use the discovery APIs for
>           adding FFA partitions on the bus. They is some workaround added
>           as v1.0 doesn't provide UUID as part of the discovery APIs which
>           is used to match the devices and driver on FFA bus.
>         - Extended SMCCC v1.2 API to support full set of input and output
>           registers.
>         - Couple of minor bug fixes found as part of testing
>
> v4->v5:
>         - Fixed couple of comments in DT bindings
>         - Moved to use native version of RXTX_MAP call, fixed vm_id param
>           to RXTX_UNMAP, dropped couple of unused confusingly named macros
>           (can be added back with correct name when we need to use them)
>
> v3->v4:
>         - Added support to allow partitions to set 32bit only mode
>         - Addressed all the comments from Jens Wiklander
>
> v2->v3:
>         - Dropped hypervisor partitions and userspace support as it is
>           no longer in the list of requirements
>         - Moved away from ioctl style interface for in-kernel users as
>           there is no need to keep in sync with userspace anymore
>         - Some kerneldoc fixes as pointed out in earlier reviews
>
> v1->v2:
>         - Moved userspace code to a separate unit, will move to separate
>           module. Still working on minimizing initcall dependencies and
>           exported functions to reuse some of the code.
>         - Fixed couple of minor issues pointed out
>         - Dropped ASYNC send message as I haven't been able to test
>
> Sudeep Holla (6):
>   arm64: smccc: Add support for SMCCCv1.2 extended input/output registers
>   firmware: arm_ffa: Add initial FFA bus support for device enumeration
>   firmware: arm_ffa: Add initial Arm FFA driver support
>   firmware: arm_ffa: Add support for SMCCC as transport to FFA driver
>   firmware: arm_ffa: Setup in-kernel users of FFA partitions
>   firmware: arm_ffa: Add support for MEM_* interfaces
>
>  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    | 210 +++++++++
>  drivers/firmware/arm_ffa/common.h |  31 ++
>  drivers/firmware/arm_ffa/driver.c | 719 ++++++++++++++++++++++++++++++
>  drivers/firmware/arm_ffa/smccc.c  |  39 ++
>  include/linux/arm-smccc.h         |  55 +++
>  include/linux/arm_ffa.h           | 266 +++++++++++
>  13 files changed, 1422 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
>
> --
> 2.25.1
>

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Re: [PATCH v6 0/6] firmware: Add initial support for Arm FF-A

[Sudeep Holla]

On Thu, May 20, 2021 at 03:20:46PM +0200, Jens Wiklander wrote:
> On Wed, May 5, 2021 at 11:38 AM Sudeep Holla <sudeep.holla@arm.com> wrote:
> >
> > Hi all,
> >
> > This is very basic implementation for in-kernel support for Arm FF-A
> > specification.
> >
> > Arm Firmware Framework for Armv8-A specification[1] describes a software
> > architecture that provides mechanism to utilise the virtualization
> > extension to isolate software images and describes interfaces that
> > standardize communication between the various software images. This
> > includes communication between images in the Secure and Normal world.
> >
> > The main idea here is to create FFA device to establish any communication
> > with a secure partition. This is currently tested with OPTEE(with changes
> > to OPTEE driver adding FFA as transport)
> >
> > The series can be fetched from [2]
> >
> > --
> > Regards,
> > Sudeep
> >
> > [1] https://developer.arm.com/documentation/den0077/latest
> > [2] git://git.kerniel.org/pub/scm/linux/kernel/git/sudeep.holla/linux.git v5.13/ffa
> 
> Tested OK with my OP-TEE driver patches on top of 755e78187c4e
> ("firmware: arm_ffa: Add support for MEM_* interfaces"), which is the
> latest on the v5.13/ffa branch above.
> 
> Tested-by: Jens Wiklander <jens.wiklander@linaro.org>
> 

Thanks Jens for testing, much appreciated!

-- 
Regards,
Sudeep

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