/* * 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); oid'>098a7c0ca4fceb8a65cb1f693c9d71990388933d /net/rose/rose_dev.c parenta0615a16f7d0ceb5804d295203c302d496d8ee91 (diff)
powerpc/mm: Fix spurrious segfaults on radix with autonuma
When autonuma (Automatic NUMA balancing) marks a PTE inaccessible it clears all the protection bits but leave the PTE valid. With the Radix MMU, an attempt at executing from such a PTE will take a fault with bit 35 of SRR1 set "SRR1_ISI_N_OR_G". It is thus incorrect to treat all such faults as errors. We should pass them to handle_mm_fault() for autonuma to deal with. The case of pages that are really not executable is handled by the existing test for VM_EXEC further down. That leaves us with catching the kernel attempts at executing user pages. We can catch that earlier, even before we do find_vma. It is never valid on powerpc for the kernel to take an exec fault to begin with. So fold that test with the existing test for the kernel faulting on kernel addresses to bail out early. Fixes: 1d18ad026844 ("powerpc/mm: Detect instruction fetch denied and report") Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Acked-by: Balbir Singh <bsingharora@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'net/rose/rose_dev.c')