/* * HD-audio core bus driver */ #include #include #include #include #include #include "trace.h" static void process_unsol_events(struct work_struct *work); static const struct hdac_bus_ops default_ops = { .command = snd_hdac_bus_send_cmd, .get_response = snd_hdac_bus_get_response, }; /** * snd_hdac_bus_init - initialize a HD-audio bas bus * @bus: the pointer to bus object * @ops: bus verb operators * @io_ops: lowlevel I/O operators * * Returns 0 if successful, or a negative error code. */ int snd_hdac_bus_init(struct hdac_bus *bus, struct device *dev, const struct hdac_bus_ops *ops, const struct hdac_io_ops *io_ops) { memset(bus, 0, sizeof(*bus)); bus->dev = dev; if (ops) bus->ops = ops; else bus->ops = &default_ops; bus->io_ops = io_ops; INIT_LIST_HEAD(&bus->stream_list); INIT_LIST_HEAD(&bus->codec_list); INIT_WORK(&bus->unsol_work, process_unsol_events); spin_lock_init(&bus->reg_lock); mutex_init(&bus->cmd_mutex); bus->irq = -1; return 0; } EXPORT_SYMBOL_GPL(snd_hdac_bus_init); /** * snd_hdac_bus_exit - clean up a HD-audio bas bus * @bus: the pointer to bus object */ void snd_hdac_bus_exit(struct hdac_bus *bus) { WARN_ON(!list_empty(&bus->stream_list)); WARN_ON(!list_empty(&bus->codec_list)); cancel_work_sync(&bus->unsol_work); } EXPORT_SYMBOL_GPL(snd_hdac_bus_exit); /** * snd_hdac_bus_exec_verb - execute a HD-audio verb on the given bus * @bus: bus object * @cmd: HD-audio encoded verb * @res: pointer to store the response, NULL if performing asynchronously * * Returns 0 if successful, or a negative error code. */ int snd_hdac_bus_exec_verb(struct hdac_bus *bus, unsigned int addr, unsigned int cmd, unsigned int *res) { int err; mutex_lock(&bus->cmd_mutex); err = snd_hdac_bus_exec_verb_unlocked(bus, addr, cmd, res); mutex_unlock(&bus->cmd_mutex); return err; } EXPORT_SYMBOL_GPL(snd_hdac_bus_exec_verb); /** * snd_hdac_bus_exec_verb_unlocked - unlocked version * @bus: bus object * @cmd: HD-audio encoded verb * @res: pointer to store the response, NULL if performing asynchronously * * Returns 0 if successful, or a negative error code. */ int snd_hdac_bus_exec_verb_unlocked(struct hdac_bus *bus, unsigned int addr, unsigned int cmd, unsigned int *res) { unsigned int tmp; int err; if (cmd == ~0) return -EINVAL; if (res) *res = -1; else if (bus->sync_write) res = &tmp; for (;;) { trace_hda_send_cmd(bus, cmd); err = bus->ops->command(bus, cmd); if (err != -EAGAIN) break; /* process pending verbs */ err = bus->ops->get_response(bus, addr, &tmp); if (err) break; } if (!err && res) { err = bus->ops->get_response(bus, addr, res); trace_hda_get_response(bus, addr, *res); } return err; } EXPORT_SYMBOL_GPL(snd_hdac_bus_exec_verb_unlocked); /** * snd_hdac_bus_queue_event - add an unsolicited event to queue * @bus: the BUS * @res: unsolicited event (lower 32bit of RIRB entry) * @res_ex: codec addr and flags (upper 32bit or RIRB entry) * * Adds the given event to the queue. The events are processed in * the workqueue asynchronously. Call this function in the interrupt * hanlder when RIRB receives an unsolicited event. */ void snd_hdac_bus_queue_event(struct hdac_bus *bus, u32 res, u32 res_ex) { unsigned int wp; if (!bus) return; trace_hda_unsol_event(bus, res, res_ex); wp = (bus->unsol_wp + 1) % HDA_UNSOL_QUEUE_SIZE; bus->unsol_wp = wp; wp <<= 1; bus->unsol_queue[wp] = res; bus->unsol_queue[wp + 1] = res_ex; schedule_work(&bus->unsol_work); } EXPORT_SYMBOL_GPL(snd_hdac_bus_queue_event); /* * process queued unsolicited events */ static void process_unsol_events(struct work_struct *work) { struct hdac_bus *bus = container_of(work, struct hdac_bus, unsol_work); struct hdac_device *codec; struct hdac_driver *drv; unsigned int rp, caddr, res; while (bus->unsol_rp != bus->unsol_wp) { rp = (bus->unsol_rp + 1) % HDA_UNSOL_QUEUE_SIZE; bus->unsol_rp = rp; rp <<= 1; res = bus->unsol_queue[rp]; caddr = bus->unsol_queue[rp + 1]; if (!(caddr & (1 << 4))) /* no unsolicited event? */ continue; codec = bus->caddr_tbl[caddr & 0x0f]; if (!codec || !codec->dev.driver) continue; drv = drv_to_hdac_driver(codec->dev.driver); if (drv->unsol_event) drv->unsol_event(codec, res); } } /** * snd_hdac_bus_add_device - Add a codec to bus * @bus: HDA core bus * @codec: HDA core device to add * * Adds the given codec to the list in the bus. The caddr_tbl array * and codec_powered bits are updated, as well. * Returns zero if success, or a negative error code. */ int snd_hdac_bus_add_device(struct hdac_bus *bus, struct hdac_device *codec) { if (bus->caddr_tbl[codec->addr]) { dev_err(bus->dev, "address 0x%x is already occupied\n", codec->addr); return -EBUSY; } list_add_tail(&codec->list, &bus->codec_list); bus->caddr_tbl[codec->addr] = codec; set_bit(codec->addr, &bus->codec_powered); bus->num_codecs++; return 0; } EXPORT_SYMBOL_GPL(snd_hdac_bus_add_device); /** * snd_hdac_bus_remove_device - Remove a codec from bus * @bus: HDA core bus * @codec: HDA core device to remove */ void snd_hdac_bus_remove_device(struct hdac_bus *bus, struct hdac_device *codec) { WARN_ON(bus != codec->bus); if (list_empty(&codec->list)) return; list_del_init(&codec->list); bus->caddr_tbl[codec->addr] = NULL; clear_bit(codec->addr, &bus->codec_powered); bus->num_codecs--; } EXPORT_SYMBOL_GPL(snd_hdac_bus_remove_device); d53fbdac9d0781e39a13b2ac6b2bd258cf3b4140 /sound/pcmcia/pdaudiocf parentbf29bddf0417a4783da3b24e8c9e017ac649326f (diff)
efi/fdt: Avoid FDT manipulation after ExitBootServices()
Some AArch64 UEFI implementations disable the MMU in ExitBootServices(), after which unaligned accesses to RAM are no longer supported. Commit: abfb7b686a3e ("efi/libstub/arm*: Pass latest memory map to the kernel") fixed an issue in the memory map handling of the stub FDT code, but inadvertently created an issue with such firmware, by moving some of the FDT manipulation to after the invocation of ExitBootServices(). Given that the stub's libfdt implementation uses the ordinary, accelerated string functions, which rely on hardware handling of unaligned accesses, manipulating the FDT with the MMU off may result in alignment faults. So fix the situation by moving the update_fdt_memmap() call into the callback function invoked by efi_exit_boot_services() right before it calls the ExitBootServices() UEFI service (which is arguably a better place for it anyway) Note that disabling the MMU in ExitBootServices() is not compliant with the UEFI spec, and carries great risk due to the fact that switching from cached to uncached memory accesses halfway through compiler generated code (i.e., involving a stack) can never be done in a way that is architecturally safe. Fixes: abfb7b686a3e ("efi/libstub/arm*: Pass latest memory map to the kernel") Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Tested-by: Riku Voipio <riku.voipio@linaro.org> Cc: <stable@vger.kernel.org> Cc: mark.rutland@arm.com Cc: linux-efi@vger.kernel.org Cc: matt@codeblueprint.co.uk Cc: leif.lindholm@linaro.org Cc: linux-arm-kernel@lists.infradead.org Link: http://lkml.kernel.org/r/1485971102-23330-2-git-send-email-ard.biesheuvel@linaro.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'sound/pcmcia/pdaudiocf')