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Wysocki" , Ard Biesheuvel , Frank Rowand , Len Brown , Andy Shevchenko , Daniel Scally , Heikki Krogerus , Sakari Ailus Cc: kernel-team@android.com, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, linux-efi@vger.kernel.org, linux-acpi@vger.kernel.org Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Allow the callers to set fwnode link flags when adding fwnode links. Signed-off-by: Saravana Kannan --- drivers/base/core.c | 5 +++-- drivers/firmware/efi/sysfb_efi.c | 2 +- drivers/of/property.c | 2 +- include/linux/fwnode.h | 3 ++- 4 files changed, 7 insertions(+), 5 deletions(-) diff --git a/drivers/base/core.c b/drivers/base/core.c index 14d46af40f9a..33055001e08e 100644 --- a/drivers/base/core.c +++ b/drivers/base/core.c @@ -92,12 +92,13 @@ static int __fwnode_link_add(struct fwnode_handle *con, return 0; } =20 -int fwnode_link_add(struct fwnode_handle *con, struct fwnode_handle *sup) +int fwnode_link_add(struct fwnode_handle *con, struct fwnode_handle *sup, + u8 flags) { int ret; =20 mutex_lock(&fwnode_link_lock); - ret =3D __fwnode_link_add(con, sup, 0); + ret =3D __fwnode_link_add(con, sup, flags); mutex_unlock(&fwnode_link_lock); return ret; } diff --git a/drivers/firmware/efi/sysfb_efi.c b/drivers/firmware/efi/sysfb_= efi.c index 456d0e5eaf78..cc807ed35aed 100644 --- a/drivers/firmware/efi/sysfb_efi.c +++ b/drivers/firmware/efi/sysfb_efi.c @@ -336,7 +336,7 @@ static int efifb_add_links(struct fwnode_handle *fwnode) if (!sup_np) return 0; =20 - fwnode_link_add(fwnode, of_fwnode_handle(sup_np)); + fwnode_link_add(fwnode, of_fwnode_handle(sup_np), 0); of_node_put(sup_np); =20 return 0; diff --git a/drivers/of/property.c b/drivers/of/property.c index 39a3ee1dfb58..751c11a28f33 100644 --- a/drivers/of/property.c +++ b/drivers/of/property.c @@ -1085,7 +1085,7 @@ static void of_link_to_phandle(struct device_node *co= n_np, tmp_np =3D of_get_next_parent(tmp_np); } =20 - fwnode_link_add(of_fwnode_handle(con_np), of_fwnode_handle(sup_np)); + fwnode_link_add(of_fwnode_handle(con_np), of_fwnode_handle(sup_np), 0); } =20 /** diff --git a/include/linux/fwnode.h b/include/linux/fwnode.h index 2a72f55d26eb..c964749953e3 100644 --- a/include/linux/fwnode.h +++ b/include/linux/fwnode.h @@ -210,7 +210,8 @@ static inline void fwnode_dev_initialized(struct fwnode= _handle *fwnode, } =20 extern bool fw_devlink_is_strict(void); -int fwnode_link_add(struct fwnode_handle *con, struct fwnode_handle *sup); +int fwnode_link_add(struct fwnode_handle *con, struct fwnode_handle *sup, + u8 flags); 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AJvYcCVQq8bLGILklZGFqpvLqXF5cC6MIPFZtA7ZkrYrY/gzi2pqCUifHHj62L4MKBySnBVh4kblkg4ohaL75OLVSyjaDa1mSgoJwR9OaERF X-Gm-Message-State: AOJu0Yx6m0ljReT1RqL88N2yqeGH3Y1h7i2Hm+SpNtUvnx618d2ATY6P 8CwzA+fA+WV0iWIu4bVyf8jNgUvknI4l9UjlzgaxCxNbl64lEc3Vky3/ws7eZaTMUJ9LnDvxf/v N0CxSsgEx6PCs2A== X-Google-Smtp-Source: AGHT+IEv4lMMKOiE36RgkVzlELzHp1ZN7UXS3b79sBBSPdrPmwmnqPYQ3VmDHWPUSWNFThn+cHttRjOIrZmvETM= X-Received: from saravanak.san.corp.google.com ([2620:15c:2d:3:496d:5de1:a404:8bee]) (user=saravanak job=sendgmr) by 2002:a05:690c:e06:b0:5fb:63fc:fac8 with SMTP id cp6-20020a05690c0e0600b005fb63fcfac8mr2203866ywb.8.1707773517438; Mon, 12 Feb 2024 13:31:57 -0800 (PST) Date: Mon, 12 Feb 2024 13:31:43 -0800 In-Reply-To: <20240212213147.489377-1-saravanak@google.com> Message-Id: <20240212213147.489377-3-saravanak@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20240212213147.489377-1-saravanak@google.com> X-Mailer: git-send-email 2.43.0.687.g38aa6559b0-goog Subject: [PATCH v2 2/4] driver core: Add FWLINK_FLAG_IGNORE to completely ignore a fwnode link From: Saravana Kannan To: Saravana Kannan , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Greg Kroah-Hartman , "Rafael J. Wysocki" , Ard Biesheuvel , Frank Rowand , Len Brown , Andy Shevchenko , Daniel Scally , Heikki Krogerus , Sakari Ailus Cc: kernel-team@android.com, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, linux-efi@vger.kernel.org, linux-acpi@vger.kernel.org Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" A fwnode link between specific supplier-consumer fwnodes can be added multiple times for multiple reasons. If that dependency doesn't exist, deleting the fwnode link once doesn't guarantee that it won't get created again. So, add FWLINK_FLAG_IGNORE flag to mark a fwnode link as one that needs to be completely ignored. Since a fwnode link's flags is an OR of all the flags passed to all the fwnode_link_add() calls to create that specific fwnode link, the FWLINK_FLAG_IGNORE flag is preserved and can be used to mark a fwnode link as on that need to be completely ignored until it is deleted. Signed-off-by: Saravana Kannan --- drivers/base/core.c | 9 ++++++++- include/linux/fwnode.h | 2 ++ 2 files changed, 10 insertions(+), 1 deletion(-) diff --git a/drivers/base/core.c b/drivers/base/core.c index 33055001e08e..bd762d90dac0 100644 --- a/drivers/base/core.c +++ b/drivers/base/core.c @@ -1010,7 +1010,8 @@ static struct fwnode_handle *fwnode_links_check_suppl= iers( return NULL; =20 list_for_each_entry(link, &fwnode->suppliers, c_hook) - if (!(link->flags & FWLINK_FLAG_CYCLE)) + if (!(link->flags & + (FWLINK_FLAG_CYCLE | FWLINK_FLAG_IGNORE))) return link->supplier; =20 return NULL; @@ -1960,6 +1961,9 @@ static bool __fw_devlink_relax_cycles(struct device *= con, } =20 list_for_each_entry(link, &sup_handle->suppliers, c_hook) { + if (link->flags & FWLINK_FLAG_IGNORE) + continue; + if (__fw_devlink_relax_cycles(con, link->supplier)) { __fwnode_link_cycle(link); ret =3D true; @@ -2033,6 +2037,9 @@ static int fw_devlink_create_devlink(struct device *c= on, int ret =3D 0; u32 flags; =20 + if (link->flags & FWLINK_FLAG_IGNORE) + return 0; + if (con->fwnode =3D=3D link->consumer) flags =3D fw_devlink_get_flags(link->flags); else diff --git a/include/linux/fwnode.h b/include/linux/fwnode.h index c964749953e3..21699eee9641 100644 --- a/include/linux/fwnode.h +++ b/include/linux/fwnode.h @@ -53,8 +53,10 @@ struct fwnode_handle { * fwnode link flags * * CYCLE: The fwnode link is part of a cycle. 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Wysocki" , Ard Biesheuvel , Frank Rowand , Len Brown , Andy Shevchenko , Daniel Scally , Heikki Krogerus , Sakari Ailus Cc: kernel-team@android.com, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, linux-efi@vger.kernel.org, linux-acpi@vger.kernel.org Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" The post-init-supplier property can be used to break a dependency cycle by marking some supplier(s) as a post device initialization supplier(s). This allows an OS to do a better job at ordering initialization and suspend/resume of the devices in a dependency cycle. Signed-off-by: Saravana Kannan --- .../bindings/post-init-supplier.yaml | 101 ++++++++++++++++++ MAINTAINERS | 13 +-- 2 files changed, 108 insertions(+), 6 deletions(-) create mode 100644 Documentation/devicetree/bindings/post-init-supplier.ya= ml diff --git a/Documentation/devicetree/bindings/post-init-supplier.yaml b/Do= cumentation/devicetree/bindings/post-init-supplier.yaml new file mode 100644 index 000000000000..aab75b667259 --- /dev/null +++ b/Documentation/devicetree/bindings/post-init-supplier.yaml @@ -0,0 +1,101 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +# Copyright (c) 2020, Google LLC. All rights reserved. +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/post-init-supplier.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Post device initialization supplier + +maintainers: + - Saravana Kannan + +description: | + This property is used to indicate that the device(s) pointed to by the + property are not needed for the initialization of the device that lists = this + property. This property is meaningful only when pointing to direct suppl= iers + of a device that are pointed to by other properties in the device. + + A device can list its suppliers in devicetree using one or more of the + standard devicetree bindings. By default, it would be safe to assume the + supplier device can be initialized before the consumer device is initial= ized. + + However, that assumption cannot be made when there are cyclic dependenci= es + between devices. Since each device is a supplier (directly or indirectly= ) of + the others in the cycle, there is no guaranteed safe order for initializ= ing + the devices in a cycle. We can try to initialize them in an arbitrary or= der + and eventually successfully initialize all of them, but that doesn't alw= ays + work well. + + For example, say, + * The device tree has the following cyclic dependency X -> Y -> Z -> X (= where + -> denotes "depends on"). + * But X is not needed to fully initialize Z (X might be needed only when= a + specific functionality is requested post initialization). + + If all the other -> are mandatory initialization dependencies, then tryi= ng to + initialize the devices in a loop (or arbitrarily) will always eventually= end + up with the devices being initialized in the order Z, Y and X. + + However, if Y is an optional supplier for X (where X provides limited + functionality when Y is not initialized and providing its services), then + trying to initialize the devices in a loop (or arbitrarily) could end up= with + the devices being initialized in the following order: + + * Z, Y and X - All devices provide full functionality + * Z, X and Y - X provides partial functionality + * X, Z and Y - X provides partial functionality + + However, we always want to initialize the devices in the order Z, Y and X + since that provides the full functionality without interruptions. + + One alternate option that might be suggested is to have the driver for X + notice that Y became available at a later point and adjust the functiona= lity + it provides. However, other userspace applications could have started us= ing X + with the limited functionality before Y was available and it might not be + possible to transparently transition X or the users of X to full + functionality while X is in use. + + Similarly, when it comes to suspend (resume) ordering, it's unclear which + device in a dependency cycle needs to be suspended/resumed first and try= ing + arbitrary orders can result in system crashes or instability. + + Explicitly calling out which link in a cycle needs to be broken when + determining the order, simplifies things a lot, improves efficiency, mak= es + the behavior more deterministic and maximizes the functionality that can= be + provided without interruption. + + This property is used to provide this additional information between dev= ices + in a cycle by telling which supplier(s) is not needed for initializing t= he + device that lists this property. + + In the example above, Z would list X as a post-init-supplier and the + initialization dependency would become X -> Y -> Z -/-> X. So the best o= rder + to initialize them become clear: Z, Y and then X. + +select: true +properties: + post-init-supplier: + # One or more suppliers can be marked as post initialization supplier + description: + List of phandles to suppliers that are not needed for initializing or + resuming this device. + $ref: /schemas/types.yaml#/definitions/phandle-array + items: + maxItems: 1 + +examples: + - | + gcc: clock-controller@1000 { + compatible =3D "vendor,soc4-gcc", "vendor,soc1-gcc"; + reg =3D <0x1000 0x80>; + clocks =3D <&dispcc 0x1> + #clock-cells =3D <1>; + post-init-supplier =3D <&dispcc>; + }; + dispcc: clock-controller@2000 { + compatible =3D "vendor,soc4-dispcc", "vendor,soc1-dispcc"; + reg =3D <0x2000 0x80>; + clocks =3D <&gcc 0xdd> + #clock-cells =3D <1>; + }; diff --git a/MAINTAINERS b/MAINTAINERS index 3dfe7ea25320..79719af714be 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -6055,12 +6055,6 @@ S: Maintained F: drivers/base/devcoredump.c F: include/linux/devcoredump.h =20 -DEVICE DEPENDENCY HELPER SCRIPT -M: Saravana Kannan -L: linux-kernel@vger.kernel.org -S: Maintained -F: scripts/dev-needs.sh - DEVICE DIRECT ACCESS (DAX) M: Dan Williams M: Vishal Verma @@ -8295,6 +8289,13 @@ F: include/linux/firewire.h F: include/uapi/linux/firewire*.h F: tools/firewire/ =20 +FIRMWARE DEVICE LINK (fw_devlink) +M: Saravana Kannan +L: linux-kernel@vger.kernel.org +S: Maintained +F: Documentation/devicetree/bindings/post-init-supplier.yaml +F: scripts/dev-needs.sh + FIRMWARE FRAMEWORK FOR ARMV8-A M: Sudeep Holla L: linux-arm-kernel@lists.infradead.org (moderated for non-subscribers) --=20 2.43.0.687.g38aa6559b0-goog From nobody Thu Dec 26 14:23:16 2024 Received: from mail-yw1-f202.google.com (mail-yw1-f202.google.com [209.85.128.202]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 6FED64E1BA for ; 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Mon, 12 Feb 2024 13:32:04 -0800 (PST) Date: Mon, 12 Feb 2024 13:31:45 -0800 In-Reply-To: <20240212213147.489377-1-saravanak@google.com> Message-Id: <20240212213147.489377-5-saravanak@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20240212213147.489377-1-saravanak@google.com> X-Mailer: git-send-email 2.43.0.687.g38aa6559b0-goog Subject: [PATCH v2 4/4] of: property: fw_devlink: Add support for "post-init-supplier" property From: Saravana Kannan To: Saravana Kannan , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Greg Kroah-Hartman , "Rafael J. Wysocki" , Ard Biesheuvel , Frank Rowand , Len Brown , Andy Shevchenko , Daniel Scally , Heikki Krogerus , Sakari Ailus Cc: kernel-team@android.com, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, linux-efi@vger.kernel.org, linux-acpi@vger.kernel.org Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Add support for this property so that dependency cycles can be broken and fw_devlink can do better probe/suspend/resume ordering between devices in a dependency cycle. Signed-off-by: Saravana Kannan --- drivers/of/property.c | 17 ++++++++++++++--- 1 file changed, 14 insertions(+), 3 deletions(-) diff --git a/drivers/of/property.c b/drivers/of/property.c index 751c11a28f33..dce451161c99 100644 --- a/drivers/of/property.c +++ b/drivers/of/property.c @@ -1066,7 +1066,8 @@ of_fwnode_device_get_match_data(const struct fwnode_h= andle *fwnode, } =20 static void of_link_to_phandle(struct device_node *con_np, - struct device_node *sup_np) + struct device_node *sup_np, + u8 flags) { struct device_node *tmp_np =3D of_node_get(sup_np); =20 @@ -1085,7 +1086,8 @@ static void of_link_to_phandle(struct device_node *co= n_np, tmp_np =3D of_get_next_parent(tmp_np); } =20 - fwnode_link_add(of_fwnode_handle(con_np), of_fwnode_handle(sup_np), 0); + fwnode_link_add(of_fwnode_handle(con_np), of_fwnode_handle(sup_np), + flags); } =20 /** @@ -1198,6 +1200,8 @@ static struct device_node *parse_##fname(struct devic= e_node *np, \ * to a struct device, implement this ops so fw_devlink can use it * to find the true consumer. * @optional: Describes whether a supplier is mandatory or not + * @fwlink_flags: Optional fwnode link flags to use when creating a fwnode= link + * for this property. * * Returns: * parse_prop() return values are @@ -1210,6 +1214,7 @@ struct supplier_bindings { const char *prop_name, int index); struct device_node *(*get_con_dev)(struct device_node *np); bool optional; + u8 fwlink_flags; }; =20 DEFINE_SIMPLE_PROP(clocks, "clocks", "#clock-cells") @@ -1240,6 +1245,7 @@ DEFINE_SIMPLE_PROP(leds, "leds", NULL) DEFINE_SIMPLE_PROP(backlight, "backlight", NULL) DEFINE_SIMPLE_PROP(panel, "panel", NULL) DEFINE_SIMPLE_PROP(msi_parent, "msi-parent", "#msi-cells") +DEFINE_SIMPLE_PROP(post_init_supplier, "post-init-supplier", NULL) DEFINE_SUFFIX_PROP(regulators, "-supply", NULL) DEFINE_SUFFIX_PROP(gpio, "-gpio", "#gpio-cells") =20 @@ -1349,6 +1355,10 @@ static const struct supplier_bindings of_supplier_bi= ndings[] =3D { { .parse_prop =3D parse_regulators, }, { .parse_prop =3D parse_gpio, }, { .parse_prop =3D parse_gpios, }, + { + .parse_prop =3D parse_post_init_supplier, + .fwlink_flags =3D FWLINK_FLAG_IGNORE, + }, {} }; =20 @@ -1393,7 +1403,8 @@ static int of_link_property(struct device_node *con_n= p, const char *prop_name) : of_node_get(con_np); matched =3D true; i++; - of_link_to_phandle(con_dev_np, phandle); + of_link_to_phandle(con_dev_np, phandle, + s->fwlink_flags); of_node_put(phandle); of_node_put(con_dev_np); } --=20 2.43.0.687.g38aa6559b0-goog