From: Damien Hedde <damien.he...@greensocs.com> Add functions to easily add input or output clocks to a device. A clock objects is added as a child of the device. The api is very similar the gpio's one.
This is based on the original work of Frederic Konrad. Signed-off-by: Damien Hedde <damien.he...@greensocs.com> --- I've removed the reviewed-by/tested-by of Philippe because I did a small modification. qdev_connect_clock() which allowed to connect an input to an output is now split in 2: + qdev_get_clock_in() which gets a given input from a device + qdev_connect_clock_out() which connect a given output to a clock (previously fetched by qdev_get_clock_in()) This part is located in (qdev-clock.[c|h]). It better matches gpios api and also add the possibility to connect a device's input clock to a random output clock (used in patch 9). Also add missing qdev-clock in the test-qdev-global-props so that tests pass. --- hw/core/Makefile.objs | 2 +- hw/core/qdev-clock.c | 155 ++++++++++++++++++++++++++++++++++++++++ hw/core/qdev.c | 32 +++++++++ include/hw/qdev-clock.h | 67 +++++++++++++++++ include/hw/qdev-core.h | 14 ++++ tests/Makefile.include | 1 + 6 files changed, 270 insertions(+), 1 deletion(-) create mode 100644 hw/core/qdev-clock.c create mode 100644 include/hw/qdev-clock.h diff --git a/hw/core/Makefile.objs b/hw/core/Makefile.objs index 8fcebf2e67..4523d3b5c7 100644 --- a/hw/core/Makefile.objs +++ b/hw/core/Makefile.objs @@ -1,5 +1,5 @@ # core qdev-related obj files, also used by *-user: -common-obj-y += qdev.o qdev-properties.o +common-obj-y += qdev.o qdev-properties.o qdev-clock.o common-obj-y += bus.o reset.o common-obj-y += resettable.o common-obj-$(CONFIG_SOFTMMU) += qdev-fw.o diff --git a/hw/core/qdev-clock.c b/hw/core/qdev-clock.c new file mode 100644 index 0000000000..bebdd8fa15 --- /dev/null +++ b/hw/core/qdev-clock.c @@ -0,0 +1,155 @@ +/* + * Device's clock + * + * Copyright GreenSocs 2016-2018 + * + * Authors: + * Frederic Konrad <fred.kon...@greensocs.com> + * Damien Hedde <damien.he...@greensocs.com> + * + * This work is licensed under the terms of the GNU GPL, version 2 or later. + * See the COPYING file in the top-level directory. + */ + +#include "qemu/osdep.h" +#include "hw/qdev-clock.h" +#include "hw/qdev-core.h" +#include "qapi/error.h" + +static NamedClockList *qdev_init_clocklist(DeviceState *dev, const char *name, + bool forward) +{ + NamedClockList *ncl; + + /* + * The clock path will be computed by the device's realize function call. + * This is required to ensure the clock's canonical path is right and log + * messages are meaningfull. + */ + assert(name); + assert(!dev->realized); + + /* The ncl structure will be freed in device's finalize function call */ + ncl = g_malloc0(sizeof(*ncl)); + ncl->name = g_strdup(name); + ncl->forward = forward; + + QLIST_INSERT_HEAD(&dev->clocks, ncl, node); + return ncl; +} + +ClockOut *qdev_init_clock_out(DeviceState *dev, const char *name) +{ + NamedClockList *ncl; + Object *clk; + + ncl = qdev_init_clocklist(dev, name, false); + + clk = object_new(TYPE_CLOCK_OUT); + + /* will fail if name already exists */ + object_property_add_child(OBJECT(dev), name, clk, &error_abort); + object_unref(clk); /* remove the initial ref made by object_new */ + + ncl->out = CLOCK_OUT(clk); + return ncl->out; +} + +ClockIn *qdev_init_clock_in(DeviceState *dev, const char *name, + ClockCallback *callback, void *opaque) +{ + NamedClockList *ncl; + Object *clk; + + ncl = qdev_init_clocklist(dev, name, false); + + clk = object_new(TYPE_CLOCK_IN); + /* + * the ref initialized by object_new will be cleared during dev finalize. + * It allows us to safely remove the callback. + */ + + /* will fail if name already exists */ + object_property_add_child(OBJECT(dev), name, clk, &error_abort); + + ncl->in = CLOCK_IN(clk); + if (callback) { + clock_set_callback(ncl->in, callback, opaque); + } + return ncl->in; +} + +static NamedClockList *qdev_get_clocklist(DeviceState *dev, const char *name) +{ + NamedClockList *ncl; + + QLIST_FOREACH(ncl, &dev->clocks, node) { + if (strcmp(name, ncl->name) == 0) { + return ncl; + } + } + + return NULL; +} + +void qdev_pass_clock(DeviceState *dev, const char *name, + DeviceState *container, const char *cont_name) +{ + NamedClockList *original_ncl, *ncl; + Object **clk; + + assert(container && cont_name); + + original_ncl = qdev_get_clocklist(container, cont_name); + assert(original_ncl); /* clock must exist in origin */ + + ncl = qdev_init_clocklist(dev, name, true); + + if (ncl->out) { + clk = (Object **)&ncl->out; + } else { + clk = (Object **)&ncl->in; + } + + /* will fail if name already exists */ + object_property_add_link(OBJECT(dev), name, object_get_typename(*clk), + clk, NULL, OBJ_PROP_LINK_STRONG, &error_abort); +} + +ClockIn *qdev_get_clock_in(DeviceState *dev, const char *name) +{ + NamedClockList *ncl; + + assert(dev && name); + + ncl = qdev_get_clocklist(dev, name); + return ncl ? ncl->in : NULL; +} + +static ClockOut *qdev_get_clock_out(DeviceState *dev, const char *name) +{ + NamedClockList *ncl; + + assert(dev && name); + + ncl = qdev_get_clocklist(dev, name); + return ncl ? ncl->out : NULL; +} + +void qdev_connect_clock_out(DeviceState *dev, const char *name, ClockIn *clk, + Error **errp) +{ + ClockOut *clkout = qdev_get_clock_out(dev, name); + + if (!clk) { + error_setg(errp, "NULL input clock"); + return; + } + + if (!clkout) { + error_setg(errp, "no output clock '%s' in device", name); + return; + } + + clock_connect(clk, clkout); +} diff --git a/hw/core/qdev.c b/hw/core/qdev.c index 9095f2b9c1..eae6cd3e09 100644 --- a/hw/core/qdev.c +++ b/hw/core/qdev.c @@ -37,6 +37,7 @@ #include "hw/qdev-properties.h" #include "hw/boards.h" #include "hw/sysbus.h" +#include "hw/clock.h" #include "migration/vmstate.h" bool qdev_hotplug = false; @@ -821,6 +822,7 @@ static void device_set_realized(Object *obj, bool value, Error **errp) DeviceClass *dc = DEVICE_GET_CLASS(dev); HotplugHandler *hotplug_ctrl; BusState *bus; + NamedClockList *clk; Error *local_err = NULL; bool unattached_parent = false; static int unattached_count; @@ -869,6 +871,15 @@ static void device_set_realized(Object *obj, bool value, Error **errp) */ g_free(dev->canonical_path); dev->canonical_path = object_get_canonical_path(OBJECT(dev)); + QLIST_FOREACH(clk, &dev->clocks, node) { + if (clk->forward) { + continue; + } else if (clk->in != NULL) { + clock_in_setup_canonical_path(clk->in); + } else { + clock_out_setup_canonical_path(clk->out); + } + } if (qdev_get_vmsd(dev)) { if (vmstate_register_with_alias_id(dev, -1, qdev_get_vmsd(dev), dev, @@ -999,6 +1010,7 @@ static void device_initfn(Object *obj) (Object **)&dev->parent_bus, NULL, 0, &error_abort); QLIST_INIT(&dev->gpios); + QLIST_INIT(&dev->clocks); } static void device_post_init(Object *obj) @@ -1015,6 +1027,7 @@ static void device_post_init(Object *obj) static void device_finalize(Object *obj) { NamedGPIOList *ngl, *next; + NamedClockList *clk, *clk_next; DeviceState *dev = DEVICE(obj); @@ -1028,6 +1041,25 @@ static void device_finalize(Object *obj) */ } + QLIST_FOREACH_SAFE(clk, &dev->clocks, node, clk_next) { + QLIST_REMOVE(clk, node); + if (!clk->forward && clk->in) { + /* + * if this clock is not forwarded, clk->in is a child of dev. + * At this point the child property and associated reference is + * already deleted but we kept a ref on clk->in to ensure it lives + * up to this point and we can safely remove the callback. + * It avoids having a lost callback to a deleted device if the + * clk->in is still referenced somewhere else (eg: by a clock + * output). + */ + clock_clear_callback(clk->in); + object_unref(OBJECT(clk->in)); + } + g_free(clk->name); + g_free(clk); + } + /* Only send event if the device had been completely realized */ if (dev->pending_deleted_event) { g_assert(dev->canonical_path); diff --git a/include/hw/qdev-clock.h b/include/hw/qdev-clock.h new file mode 100644 index 0000000000..c4ea912fdc --- /dev/null +++ b/include/hw/qdev-clock.h @@ -0,0 +1,67 @@ +#ifndef QDEV_CLOCK_H +#define QDEV_CLOCK_H + +#include "hw/clock.h" + +/** + * qdev_init_clock_in: + * @dev: the device in which to add a clock + * @name: the name of the clock (can't be NULL). + * @callback: optional callback to be called on update or NULL. + * @opaque: argument for the callback + * @returns: a pointer to the newly added clock + * + * Add a input clock to device @dev as a clock named @name. + * This adds a child<> property. + * The callback will be called with @dev as opaque parameter. + */ +ClockIn *qdev_init_clock_in(DeviceState *dev, const char *name, + ClockCallback *callback, void *opaque); + +/** + * qdev_init_clock_out: + * @dev: the device to add a clock to + * @name: the name of the clock (can't be NULL). + * @callback: optional callback to be called on update or NULL. + * @returns: a pointer to the newly added clock + * + * Add a output clock to device @dev as a clock named @name. + * This adds a child<> property. + */ +ClockOut *qdev_init_clock_out(DeviceState *dev, const char *name); + +/** + * qdev_get_clock_in: + * @dev: the device which has the clock + * @name: the name of the clock (can't be NULL). + * @returns: a pointer to the clock + * + * Get the clock @name from @dev or NULL if does not exists. + */ +ClockIn *qdev_get_clock_in(DeviceState *dev, const char *name); + +/** + * qdev_connect_clock_out: + * @dev: the device which has the clock + * @name: the name of the clock (can't be NULL). + * @errp: error report + * + * Connect @clk to the output clock @name of @dev. + * Reports an error if clk is NULL or @name does not exists in @dev. + */ +void qdev_connect_clock_out(DeviceState *dev, const char *name, ClockIn *clk, + Error **errp); + +/** + * qdev_pass_clock: + * @dev: the device to forward the clock to + * @name: the name of the clock to be added (can't be NULL) + * @container: the device which already has the clock + * @cont_name: the name of the clock in the container device + * + * Add a clock @name to @dev which forward to the clock @cont_name in @container + */ +void qdev_pass_clock(DeviceState *dev, const char *name, + DeviceState *container, const char *cont_name); + +#endif /* QDEV_CLOCK_H */ diff --git a/include/hw/qdev-core.h b/include/hw/qdev-core.h index eb11f0f801..60a65f6142 100644 --- a/include/hw/qdev-core.h +++ b/include/hw/qdev-core.h @@ -131,6 +131,19 @@ struct NamedGPIOList { QLIST_ENTRY(NamedGPIOList) node; }; +typedef struct NamedClockList NamedClockList; + +typedef struct ClockIn ClockIn; +typedef struct ClockOut ClockOut; + +struct NamedClockList { + char *name; + bool forward; + ClockIn *in; + ClockOut *out; + QLIST_ENTRY(NamedClockList) node; +}; + /** * DeviceState: * @realized: Indicates whether the device has been fully constructed. @@ -152,6 +165,7 @@ struct DeviceState { int hotplugged; BusState *parent_bus; QLIST_HEAD(, NamedGPIOList) gpios; + QLIST_HEAD(, NamedClockList) clocks; QLIST_HEAD(, BusState) child_bus; int num_child_bus; int instance_id_alias; diff --git a/tests/Makefile.include b/tests/Makefile.include index f0b4628cc6..5c54beb29e 100644 --- a/tests/Makefile.include +++ b/tests/Makefile.include @@ -566,6 +566,7 @@ tests/test-qdev-global-props$(EXESUF): tests/test-qdev-global-props.o \ hw/core/irq.o \ hw/core/fw-path-provider.o \ hw/core/reset.o \ + hw/core/clock.o \ $(test-qapi-obj-y) tests/test-vmstate$(EXESUF): tests/test-vmstate.o \ migration/vmstate.o migration/vmstate-types.o migration/qemu-file.o \ -- 2.22.0