diff options
Diffstat (limited to 'drivers/staging/unisys/visorbus/visorchipset.c')
| -rw-r--r-- | drivers/staging/unisys/visorbus/visorchipset.c | 1593 |
1 files changed, 752 insertions, 841 deletions
diff --git a/drivers/staging/unisys/visorbus/visorchipset.c b/drivers/staging/unisys/visorbus/visorchipset.c index d248c946a13b..59871495ea85 100644 --- a/drivers/staging/unisys/visorbus/visorchipset.c +++ b/drivers/staging/unisys/visorbus/visorchipset.c @@ -25,21 +25,12 @@ #include <linux/uuid.h> #include <linux/crash_dump.h> -#include "channel_guid.h" -#include "controlvmchannel.h" -#include "controlvmcompletionstatus.h" -#include "guestlinuxdebug.h" -#include "periodic_work.h" -#include "version.h" #include "visorbus.h" #include "visorbus_private.h" #include "vmcallinterface.h" #define CURRENT_FILE_PC VISOR_CHIPSET_PC_visorchipset_main_c -#define MAX_NAME_SIZE 128 -#define MAX_IP_SIZE 50 -#define MAXOUTSTANDINGCHANNELCOMMAND 256 #define POLLJIFFIES_CONTROLVMCHANNEL_FAST 1 #define POLLJIFFIES_CONTROLVMCHANNEL_SLOW 100 @@ -58,9 +49,6 @@ * Module parameters */ static int visorchipset_major; -static int visorchipset_visorbusregwait = 1; /* default is on */ -static unsigned long controlvm_payload_bytes_buffered; -static u32 dump_vhba_bus; static int visorchipset_open(struct inode *inode, struct file *file) @@ -79,15 +67,15 @@ visorchipset_release(struct inode *inode, struct file *file) return 0; } -/* When the controlvm channel is idle for at least MIN_IDLE_SECONDS, -* we switch to slow polling mode. As soon as we get a controlvm -* message, we switch back to fast polling mode. -*/ +/* + * When the controlvm channel is idle for at least MIN_IDLE_SECONDS, + * we switch to slow polling mode. As soon as we get a controlvm + * message, we switch back to fast polling mode. + */ #define MIN_IDLE_SECONDS 10 static unsigned long poll_jiffies = POLLJIFFIES_CONTROLVMCHANNEL_FAST; /* when we got our last controlvm message */ static unsigned long most_recent_message_jiffies; -static int visorbusregistered; struct parser_context { unsigned long allocbytes; @@ -99,51 +87,36 @@ struct parser_context { }; static struct delayed_work periodic_controlvm_work; -static DEFINE_SEMAPHORE(notifier_lock); static struct cdev file_cdev; static struct visorchannel **file_controlvm_channel; -static struct controlvm_message_packet g_devicechangestate_packet; - -static LIST_HEAD(bus_info_list); -static LIST_HEAD(dev_info_list); static struct visorchannel *controlvm_channel; /* Manages the request payload in the controlvm channel */ struct visor_controlvm_payload_info { u8 *ptr; /* pointer to base address of payload pool */ - u64 offset; /* offset from beginning of controlvm + u64 offset; /* + * offset from beginning of controlvm * channel to beginning of payload * pool */ u32 bytes; /* number of bytes in payload pool */ }; static struct visor_controlvm_payload_info controlvm_payload_info; +static unsigned long controlvm_payload_bytes_buffered; -/* The following globals are used to handle the scenario where we are unable to - * offload the payload from a controlvm message due to memory requirements. In +/* + * The following globals are used to handle the scenario where we are unable to + * offload the payload from a controlvm message due to memory requirements. In * this scenario, we simply stash the controlvm message, then attempt to * process it again the next time controlvm_periodic_work() runs. */ static struct controlvm_message controlvm_pending_msg; static bool controlvm_pending_msg_valid; -/* This identifies a data buffer that has been received via a controlvm messages - * in a remote --> local CONTROLVM_TRANSMIT_FILE conversation. - */ -struct putfile_buffer_entry { - struct list_head next; /* putfile_buffer_entry list */ - struct parser_context *parser_ctx; /* points to input data buffer */ -}; - -/* List of struct putfile_request *, via next_putfile_request member. - * Each entry in this list identifies an outstanding TRANSMIT_FILE - * conversation. - */ -static LIST_HEAD(putfile_request_list); - -/* This describes a buffer and its current state of transfer (e.g., how many +/* + * This describes a buffer and its current state of transfer (e.g., how many * bytes have already been supplied as putfile data, and how many bytes are * remaining) for a putfile_request. */ @@ -155,8 +128,9 @@ struct putfile_active_buffer { }; #define PUTFILE_REQUEST_SIG 0x0906101302281211 -/* This identifies a single remote --> local CONTROLVM_TRANSMIT_FILE - * conversation. Structs of this type are dynamically linked into +/* + * This identifies a single remote --> local CONTROLVM_TRANSMIT_FILE + * conversation. Structs of this type are dynamically linked into * <Putfile_request_list>. */ struct putfile_request { @@ -168,7 +142,8 @@ struct putfile_request { /* link to next struct putfile_request */ struct list_head next_putfile_request; - /* head of putfile_buffer_entry list, which describes the data to be + /* + * head of putfile_buffer_entry list, which describes the data to be * supplied as putfile data; * - this list is added to when controlvm messages come in that supply * file data @@ -184,11 +159,13 @@ struct putfile_request { /* data not yet read within current putfile_buffer_entry */ struct putfile_active_buffer active_buf; - /* <0 = failed, 0 = in-progress, >0 = successful; */ - /* note that this must be set with req_list_lock, and if you set <0, */ - /* it is your responsibility to also free up all of the other objects */ - /* in this struct (like input_buffer_list, active_buf.parser_ctx) */ - /* before releasing the lock */ + /* + * <0 = failed, 0 = in-progress, >0 = successful; + * note that this must be set with req_list_lock, and if you set <0, + * it is your responsibility to also free up all of the other objects + * in this struct (like input_buffer_list, active_buf.parser_ctx) + * before releasing the lock + */ int completion_status; }; @@ -199,289 +176,11 @@ struct parahotplug_request { struct controlvm_message msg; }; -static LIST_HEAD(parahotplug_request_list); -static DEFINE_SPINLOCK(parahotplug_request_list_lock); /* lock for above */ -static void parahotplug_process_list(void); - -/* Manages the info for a CONTROLVM_DUMP_CAPTURESTATE / - * CONTROLVM_REPORTEVENT. - */ -static struct visorchipset_busdev_notifiers busdev_notifiers; - -static void bus_create_response(struct visor_device *p, int response); -static void bus_destroy_response(struct visor_device *p, int response); -static void device_create_response(struct visor_device *p, int response); -static void device_destroy_response(struct visor_device *p, int response); -static void device_resume_response(struct visor_device *p, int response); - -static void visorchipset_device_pause_response(struct visor_device *p, - int response); - -static struct visorchipset_busdev_responders busdev_responders = { - .bus_create = bus_create_response, - .bus_destroy = bus_destroy_response, - .device_create = device_create_response, - .device_destroy = device_destroy_response, - .device_pause = visorchipset_device_pause_response, - .device_resume = device_resume_response, -}; - /* info for /dev/visorchipset */ -static dev_t major_dev = -1; /**< indicates major num for device */ +static dev_t major_dev = -1; /*< indicates major num for device */ /* prototypes for attributes */ static ssize_t toolaction_show(struct device *dev, - struct device_attribute *attr, char *buf); -static ssize_t toolaction_store(struct device *dev, - struct device_attribute *attr, - const char *buf, size_t count); -static DEVICE_ATTR_RW(toolaction); - -static ssize_t boottotool_show(struct device *dev, - struct device_attribute *attr, char *buf); -static ssize_t boottotool_store(struct device *dev, - struct device_attribute *attr, const char *buf, - size_t count); -static DEVICE_ATTR_RW(boottotool); - -static ssize_t error_show(struct device *dev, struct device_attribute *attr, - char *buf); -static ssize_t error_store(struct device *dev, struct device_attribute *attr, - const char *buf, size_t count); -static DEVICE_ATTR_RW(error); - -static ssize_t textid_show(struct device *dev, struct device_attribute *attr, - char *buf); -static ssize_t textid_store(struct device *dev, struct device_attribute *attr, - const char *buf, size_t count); -static DEVICE_ATTR_RW(textid); - -static ssize_t remaining_steps_show(struct device *dev, - struct device_attribute *attr, char *buf); -static ssize_t remaining_steps_store(struct device *dev, - struct device_attribute *attr, - const char *buf, size_t count); -static DEVICE_ATTR_RW(remaining_steps); - -static ssize_t devicedisabled_store(struct device *dev, - struct device_attribute *attr, - const char *buf, size_t count); -static DEVICE_ATTR_WO(devicedisabled); - -static ssize_t deviceenabled_store(struct device *dev, - struct device_attribute *attr, - const char *buf, size_t count); -static DEVICE_ATTR_WO(deviceenabled); - -static struct attribute *visorchipset_install_attrs[] = { - &dev_attr_toolaction.attr, - &dev_attr_boottotool.attr, - &dev_attr_error.attr, - &dev_attr_textid.attr, - &dev_attr_remaining_steps.attr, - NULL -}; - -static struct attribute_group visorchipset_install_group = { - .name = "install", - .attrs = visorchipset_install_attrs -}; - -static struct attribute *visorchipset_parahotplug_attrs[] = { - &dev_attr_devicedisabled.attr, - &dev_attr_deviceenabled.attr, - NULL -}; - -static struct attribute_group visorchipset_parahotplug_group = { - .name = "parahotplug", - .attrs = visorchipset_parahotplug_attrs -}; - -static const struct attribute_group *visorchipset_dev_groups[] = { - &visorchipset_install_group, - &visorchipset_parahotplug_group, - NULL -}; - -static void visorchipset_dev_release(struct device *dev) -{ -} - -/* /sys/devices/platform/visorchipset */ -static struct platform_device visorchipset_platform_device = { - .name = "visorchipset", - .id = -1, - .dev.groups = visorchipset_dev_groups, - .dev.release = visorchipset_dev_release, -}; - -/* Function prototypes */ -static void controlvm_respond(struct controlvm_message_header *msg_hdr, - int response); -static void controlvm_respond_chipset_init( - struct controlvm_message_header *msg_hdr, int response, - enum ultra_chipset_feature features); -static void controlvm_respond_physdev_changestate( - struct controlvm_message_header *msg_hdr, int response, - struct spar_segment_state state); - -static void parser_done(struct parser_context *ctx); - -static struct parser_context * -parser_init_byte_stream(u64 addr, u32 bytes, bool local, bool *retry) -{ - int allocbytes = sizeof(struct parser_context) + bytes; - struct parser_context *ctx; - - if (retry) - *retry = false; - - /* - * alloc an 0 extra byte to ensure payload is - * '\0'-terminated - */ - allocbytes++; - if ((controlvm_payload_bytes_buffered + bytes) - > MAX_CONTROLVM_PAYLOAD_BYTES) { - if (retry) - *retry = true; - return NULL; - } - ctx = kzalloc(allocbytes, GFP_KERNEL | __GFP_NORETRY); - if (!ctx) { - if (retry) - *retry = true; - return NULL; - } - - ctx->allocbytes = allocbytes; - ctx->param_bytes = bytes; - ctx->curr = NULL; - ctx->bytes_remaining = 0; - ctx->byte_stream = false; - if (local) { - void *p; - - if (addr > virt_to_phys(high_memory - 1)) - goto err_finish_ctx; - p = __va((unsigned long)(addr)); - memcpy(ctx->data, p, bytes); - } else { - void *mapping = memremap(addr, bytes, MEMREMAP_WB); - - if (!mapping) - goto err_finish_ctx; - memcpy(ctx->data, mapping, bytes); - memunmap(mapping); - } - - ctx->byte_stream = true; - controlvm_payload_bytes_buffered += ctx->param_bytes; - - return ctx; - -err_finish_ctx: - parser_done(ctx); - return NULL; -} - -static uuid_le -parser_id_get(struct parser_context *ctx) -{ - struct spar_controlvm_parameters_header *phdr = NULL; - - if (!ctx) - return NULL_UUID_LE; - phdr = (struct spar_controlvm_parameters_header *)(ctx->data); - return phdr->id; -} - -/** Describes the state from the perspective of which controlvm messages have - * been received for a bus or device. - */ - -enum PARSER_WHICH_STRING { - PARSERSTRING_INITIATOR, - PARSERSTRING_TARGET, - PARSERSTRING_CONNECTION, - PARSERSTRING_NAME, /* TODO: only PARSERSTRING_NAME is used ? */ -}; - -static void -parser_param_start(struct parser_context *ctx, - enum PARSER_WHICH_STRING which_string) -{ - struct spar_controlvm_parameters_header *phdr = NULL; - - if (!ctx) - return; - - phdr = (struct spar_controlvm_parameters_header *)(ctx->data); - switch (which_string) { - case PARSERSTRING_INITIATOR: - ctx->curr = ctx->data + phdr->initiator_offset; - ctx->bytes_remaining = phdr->initiator_length; - break; - case PARSERSTRING_TARGET: - ctx->curr = ctx->data + phdr->target_offset; - ctx->bytes_remaining = phdr->target_length; - break; - case PARSERSTRING_CONNECTION: - ctx->curr = ctx->data + phdr->connection_offset; - ctx->bytes_remaining = phdr->connection_length; - break; - case PARSERSTRING_NAME: - ctx->curr = ctx->data + phdr->name_offset; - ctx->bytes_remaining = phdr->name_length; - break; - default: - break; - } -} - -static void parser_done(struct parser_context *ctx) -{ - if (!ctx) - return; - controlvm_payload_bytes_buffered -= ctx->param_bytes; - kfree(ctx); -} - -static void * -parser_string_get(struct parser_context *ctx) -{ - u8 *pscan; - unsigned long nscan; - int value_length = -1; - void *value = NULL; - int i; - - if (!ctx) - return NULL; - pscan = ctx->curr; - nscan = ctx->bytes_remaining; - if (nscan == 0) - return NULL; - if (!pscan) - return NULL; - for (i = 0, value_length = -1; i < nscan; i++) - if (pscan[i] == '\0') { - value_length = i; - break; - } - if (value_length < 0) /* '\0' was not included in the length */ - value_length = nscan; - value = kmalloc(value_length + 1, GFP_KERNEL | __GFP_NORETRY); - if (!value) - return NULL; - if (value_length > 0) - memcpy(value, pscan, value_length); - ((u8 *)(value))[value_length] = '\0'; - return value; -} - -static ssize_t toolaction_show(struct device *dev, struct device_attribute *attr, char *buf) { @@ -513,6 +212,7 @@ static ssize_t toolaction_store(struct device *dev, return ret; return count; } +static DEVICE_ATTR_RW(toolaction); static ssize_t boottotool_show(struct device *dev, struct device_attribute *attr, @@ -549,6 +249,7 @@ static ssize_t boottotool_store(struct device *dev, return ret; return count; } +static DEVICE_ATTR_RW(boottotool); static ssize_t error_show(struct device *dev, struct device_attribute *attr, char *buf) @@ -580,6 +281,7 @@ static ssize_t error_store(struct device *dev, struct device_attribute *attr, return ret; return count; } +static DEVICE_ATTR_RW(error); static ssize_t textid_show(struct device *dev, struct device_attribute *attr, char *buf) @@ -612,6 +314,7 @@ static ssize_t textid_store(struct device *dev, struct device_attribute *attr, return ret; return count; } +static DEVICE_ATTR_RW(textid); static ssize_t remaining_steps_show(struct device *dev, struct device_attribute *attr, char *buf) @@ -644,6 +347,103 @@ static ssize_t remaining_steps_store(struct device *dev, return ret; return count; } +static DEVICE_ATTR_RW(remaining_steps); + +static uuid_le +parser_id_get(struct parser_context *ctx) +{ + struct spar_controlvm_parameters_header *phdr = NULL; + + if (!ctx) + return NULL_UUID_LE; + phdr = (struct spar_controlvm_parameters_header *)(ctx->data); + return phdr->id; +} + +/* + * Describes the state from the perspective of which controlvm messages have + * been received for a bus or device. + */ + +enum PARSER_WHICH_STRING { + PARSERSTRING_INITIATOR, + PARSERSTRING_TARGET, + PARSERSTRING_CONNECTION, + PARSERSTRING_NAME, /* TODO: only PARSERSTRING_NAME is used ? */ +}; + +static void +parser_param_start(struct parser_context *ctx, + enum PARSER_WHICH_STRING which_string) +{ + struct spar_controlvm_parameters_header *phdr = NULL; + + if (!ctx) + return; + + phdr = (struct spar_controlvm_parameters_header *)(ctx->data); + switch (which_string) { + case PARSERSTRING_INITIATOR: + ctx->curr = ctx->data + phdr->initiator_offset; + ctx->bytes_remaining = phdr->initiator_length; + break; + case PARSERSTRING_TARGET: + ctx->curr = ctx->data + phdr->target_offset; + ctx->bytes_remaining = phdr->target_length; + break; + case PARSERSTRING_CONNECTION: + ctx->curr = ctx->data + phdr->connection_offset; + ctx->bytes_remaining = phdr->connection_length; + break; + case PARSERSTRING_NAME: + ctx->curr = ctx->data + phdr->name_offset; + ctx->bytes_remaining = phdr->name_length; + break; + default: + break; + } +} + +static void parser_done(struct parser_context *ctx) +{ + if (!ctx) + return; + controlvm_payload_bytes_buffered -= ctx->param_bytes; + kfree(ctx); +} + +static void * +parser_string_get(struct parser_context *ctx) +{ + u8 *pscan; + unsigned long nscan; + int value_length = -1; + void *value = NULL; + int i; + + if (!ctx) + return NULL; + pscan = ctx->curr; + nscan = ctx->bytes_remaining; + if (nscan == 0) + return NULL; + if (!pscan) + return NULL; + for (i = 0, value_length = -1; i < nscan; i++) + if (pscan[i] == '\0') { + value_length = i; + break; + } + if (value_length < 0) /* '\0' was not included in the length */ + value_length = nscan; + value = kmalloc(value_length + 1, GFP_KERNEL | __GFP_NORETRY); + if (!value) + return NULL; + if (value_length > 0) + memcpy(value, pscan, value_length); + ((u8 *)(value))[value_length] = '\0'; + return value; +} struct visor_busdev { u32 bus_no; @@ -683,32 +483,36 @@ struct visor_device *visorbus_get_device_by_id(u32 bus_no, u32 dev_no, vdev = to_visor_device(dev); return vdev; } -EXPORT_SYMBOL(visorbus_get_device_by_id); -void -visorchipset_register_busdev( - struct visorchipset_busdev_notifiers *notifiers, - struct visorchipset_busdev_responders *responders, - struct ultra_vbus_deviceinfo *driver_info) -{ - down(¬ifier_lock); - if (!notifiers) { - memset(&busdev_notifiers, 0, - sizeof(busdev_notifiers)); - visorbusregistered = 0; /* clear flag */ - } else { - busdev_notifiers = *notifiers; - visorbusregistered = 1; /* set flag */ +static void +controlvm_init_response(struct controlvm_message *msg, + struct controlvm_message_header *msg_hdr, int response) +{ + memset(msg, 0, sizeof(struct controlvm_message)); + memcpy(&msg->hdr, msg_hdr, sizeof(struct controlvm_message_header)); + msg->hdr.payload_bytes = 0; + msg->hdr.payload_vm_offset = 0; + msg->hdr.payload_max_bytes = 0; + if (response < 0) { + msg->hdr.flags.failed = 1; + msg->hdr.completion_status = (u32)(-response); } - if (responders) - *responders = busdev_responders; - if (driver_info) - bus_device_info_init(driver_info, "chipset", "visorchipset", - VERSION, NULL); +} + +static void +controlvm_respond_chipset_init(struct controlvm_message_header *msg_hdr, + int response, + enum ultra_chipset_feature features) +{ + struct controlvm_message outmsg; - up(¬ifier_lock); + controlvm_init_response(&outmsg, msg_hdr, response); + outmsg.cmd.init_chipset.features = features; + if (visorchannel_signalinsert(controlvm_channel, + CONTROLVM_QUEUE_REQUEST, &outmsg)) { + return; + } } -EXPORT_SYMBOL_GPL(visorchipset_register_busdev); static void chipset_init(struct controlvm_message *inmsg) @@ -725,14 +529,16 @@ chipset_init(struct controlvm_message *inmsg) chipset_inited = 1; POSTCODE_LINUX_2(CHIPSET_INIT_EXIT_PC, POSTCODE_SEVERITY_INFO); - /* Set features to indicate we support parahotplug (if Command + /* + * Set features to indicate we support parahotplug (if Command * also supports it). */ features = inmsg->cmd.init_chipset. features & ULTRA_CHIPSET_FEATURE_PARA_HOTPLUG; - /* Set the "reply" bit so Command knows this is a + /* + * Set the "reply" bit so Command knows this is a * features-aware driver. */ features |= ULTRA_CHIPSET_FEATURE_REPLY; @@ -743,21 +549,6 @@ out_respond: } static void -controlvm_init_response(struct controlvm_message *msg, - struct controlvm_message_header *msg_hdr, int response) -{ - memset(msg, 0, sizeof(struct controlvm_message)); - memcpy(&msg->hdr, msg_hdr, sizeof(struct controlvm_message_header)); - msg->hdr.payload_bytes = 0; - msg->hdr.payload_vm_offset = 0; - msg->hdr.payload_max_bytes = 0; - if (response < 0) { - msg->hdr.flags.failed = 1; - msg->hdr.completion_status = (u32)(-response); - } -} - -static void controlvm_respond(struct controlvm_message_header *msg_hdr, int response) { struct controlvm_message outmsg; @@ -766,23 +557,8 @@ controlvm_respond(struct controlvm_message_header *msg_hdr, int response) if (outmsg.hdr.flags.test_message == 1) return; - if (!visorchannel_signalinsert(controlvm_channel, - CONTROLVM_QUEUE_REQUEST, &outmsg)) { - return; - } -} - -static void -controlvm_respond_chipset_init(struct controlvm_message_header *msg_hdr, - int response, - enum ultra_chipset_feature features) -{ - struct controlvm_message outmsg; - - controlvm_init_response(&outmsg, msg_hdr, response); - outmsg.cmd.init_chipset.features = features; - if (!visorchannel_signalinsert(controlvm_channel, - CONTROLVM_QUEUE_REQUEST, &outmsg)) { + if (visorchannel_signalinsert(controlvm_channel, + CONTROLVM_QUEUE_REQUEST, &outmsg)) { return; } } @@ -796,8 +572,8 @@ static void controlvm_respond_physdev_changestate( controlvm_init_response(&outmsg, msg_hdr, response); outmsg.cmd.device_change_state.state = state; outmsg.cmd.device_change_state.flags.phys_device = 1; - if (!visorchannel_signalinsert(controlvm_channel, - CONTROLVM_QUEUE_REQUEST, &outmsg)) { + if (visorchannel_signalinsert(controlvm_channel, + CONTROLVM_QUEUE_REQUEST, &outmsg)) { return; } } @@ -894,8 +670,8 @@ device_changestate_responder(enum controlvm_id cmd_id, outmsg.cmd.device_change_state.dev_no = dev_no; outmsg.cmd.device_change_state.state = response_state; - if (!visorchannel_signalinsert(controlvm_channel, - CONTROLVM_QUEUE_REQUEST, &outmsg)) + if (visorchannel_signalinsert(controlvm_channel, + CONTROLVM_QUEUE_REQUEST, &outmsg)) return; } @@ -920,20 +696,20 @@ bus_epilog(struct visor_device *bus_info, { struct controlvm_message_header *pmsg_hdr = NULL; - down(¬ifier_lock); - if (!bus_info) { - /* relying on a valid passed in response code */ - /* be lazy and re-use msg_hdr for this failure, is this ok?? */ + /* + * relying on a valid passed in response code + * be lazy and re-use msg_hdr for this failure, is this ok?? + */ pmsg_hdr = msg_hdr; - goto out_respond_and_unlock; + goto out_respond; } if (bus_info->pending_msg_hdr) { /* only non-NULL if dev is still waiting on a response */ response = -CONTROLVM_RESP_ERROR_MESSAGE_ID_INVALID_FOR_CLIENT; pmsg_hdr = bus_info->pending_msg_hdr; - goto out_respond_and_unlock; + goto out_respond; } if (need_response) { @@ -942,7 +718,7 @@ bus_epilog(struct visor_device *bus_info, POSTCODE_LINUX_4(MALLOC_FAILURE_PC, cmd, bus_info->chipset_bus_no, POSTCODE_SEVERITY_ERR); - goto out_unlock; + return; } memcpy(pmsg_hdr, msg_hdr, @@ -953,25 +729,16 @@ bus_epilog(struct visor_device *bus_info, if (response == CONTROLVM_RESP_SUCCESS) { switch (cmd) { case CONTROLVM_BUS_CREATE: - if (busdev_notifiers.bus_create) { - (*busdev_notifiers.bus_create) (bus_info); - goto out_unlock; - } + chipset_bus_create(bus_info); break; case CONTROLVM_BUS_DESTROY: - if (busdev_notifiers.bus_destroy) { - (*busdev_notifiers.bus_destroy) (bus_info); - goto out_unlock; - } + chipset_bus_destroy(bus_info); break; } } -out_respond_and_unlock: +out_respond: bus_responder(cmd, pmsg_hdr, response); - -out_unlock: - up(¬ifier_lock); } static void @@ -980,31 +747,29 @@ device_epilog(struct visor_device *dev_info, struct controlvm_message_header *msg_hdr, int response, bool need_response, bool for_visorbus) { - struct visorchipset_busdev_notifiers *notifiers; struct controlvm_message_header *pmsg_hdr = NULL; - notifiers = &busdev_notifiers; - - down(¬ifier_lock); if (!dev_info) { - /* relying on a valid passed in response code */ - /* be lazy and re-use msg_hdr for this failure, is this ok?? */ + /* + * relying on a valid passed in response code + * be lazy and re-use msg_hdr for this failure, is this ok?? + */ pmsg_hdr = msg_hdr; - goto out_respond_and_unlock; + goto out_respond; } if (dev_info->pending_msg_hdr) { /* only non-NULL if dev is still waiting on a response */ response = -CONTROLVM_RESP_ERROR_MESSAGE_ID_INVALID_FOR_CLIENT; pmsg_hdr = dev_info->pending_msg_hdr; - goto out_respond_and_unlock; + goto out_respond; } if (need_response) { pmsg_hdr = kzalloc(sizeof(*pmsg_hdr), GFP_KERNEL); if (!pmsg_hdr) { response = -CONTROLVM_RESP_ERROR_KMALLOC_FAILED; - goto out_respond_and_unlock; + goto out_respond; } memcpy(pmsg_hdr, msg_hdr, @@ -1015,48 +780,34 @@ device_epilog(struct visor_device *dev_info, if (response >= 0) { switch (cmd) { case CONTROLVM_DEVICE_CREATE: - if (notifiers->device_create) { - (*notifiers->device_create) (dev_info); - goto out_unlock; - } + chipset_device_create(dev_info); break; case CONTROLVM_DEVICE_CHANGESTATE: /* ServerReady / ServerRunning / SegmentStateRunning */ if (state.alive == segment_state_running.alive && state.operating == segment_state_running.operating) { - if (notifiers->device_resume) { - (*notifiers->device_resume) (dev_info); - goto out_unlock; - } + chipset_device_resume(dev_info); } /* ServerNotReady / ServerLost / SegmentStateStandby */ else if (state.alive == segment_state_standby.alive && state.operating == segment_state_standby.operating) { - /* technically this is standby case + /* + * technically this is standby case * where server is lost */ - if (notifiers->device_pause) { - (*notifiers->device_pause) (dev_info); - goto out_unlock; - } + chipset_device_pause(dev_info); } break; case CONTROLVM_DEVICE_DESTROY: - if (notifiers->device_destroy) { - (*notifiers->device_destroy) (dev_info); - goto out_unlock; - } + chipset_device_destroy(dev_info); break; } } -out_respond_and_unlock: +out_respond: device_responder(cmd, pmsg_hdr, response); - -out_unlock: - up(¬ifier_lock); } static void @@ -1103,10 +854,8 @@ bus_create(struct controlvm_message *inmsg) goto out_bus_epilog; } bus_info->visorchannel = visorchannel; - if (uuid_le_cmp(cmd->create_bus.bus_inst_uuid, spar_siovm_uuid) == 0) { - dump_vhba_bus = bus_no; + if (uuid_le_cmp(cmd->create_bus.bus_inst_uuid, spar_siovm_uuid) == 0) save_crash_message(inmsg, CRASH_BUS); - } POSTCODE_LINUX_3(BUS_CREATE_EXIT_PC, bus_no, POSTCODE_SEVERITY_INFO); @@ -1303,11 +1052,19 @@ my_device_destroy(struct controlvm_message *inmsg) inmsg->hdr.flags.response_expected == 1, 1); } -/* When provided with the physical address of the controlvm channel +/** + * initialize_controlvm_payload_info() - init controlvm_payload_info struct + * @phys_addr: the physical address of controlvm channel + * @offset: the offset to payload + * @bytes: the size of the payload in bytes + * @info: the returning valid struct + * + * When provided with the physical address of the controlvm channel * (phys_addr), the offset to the payload area we need to manage * (offset), and the size of this payload area (bytes), fills in the - * controlvm_payload_info struct. Returns true for success or false - * for failure. + * controlvm_payload_info struct. + * + * Return: CONTROLVM_RESP_SUCCESS for success or a negative for failure */ static int initialize_controlvm_payload_info(u64 phys_addr, u64 offset, u32 bytes, @@ -1371,95 +1128,14 @@ initialize_controlvm_payload(void) &controlvm_payload_info); } -/* Send ACTION=online for DEVPATH=/sys/devices/platform/visorchipset. - * Returns CONTROLVM_RESP_xxx code. - */ -static int -visorchipset_chipset_ready(void) -{ - kobject_uevent(&visorchipset_platform_device.dev.kobj, KOBJ_ONLINE); - return CONTROLVM_RESP_SUCCESS; -} - -static int -visorchipset_chipset_selftest(void) -{ - char env_selftest[20]; - char *envp[] = { env_selftest, NULL }; - - sprintf(env_selftest, "SPARSP_SELFTEST=%d", 1); - kobject_uevent_env(&visorchipset_platform_device.dev.kobj, KOBJ_CHANGE, - envp); - return CONTROLVM_RESP_SUCCESS; -} - -/* Send ACTION=offline for DEVPATH=/sys/devices/platform/visorchipset. - * Returns CONTROLVM_RESP_xxx code. - */ -static int -visorchipset_chipset_notready(void) -{ - kobject_uevent(&visorchipset_platform_device.dev.kobj, KOBJ_OFFLINE); - return CONTROLVM_RESP_SUCCESS; -} - -static void -chipset_ready(struct controlvm_message_header *msg_hdr) -{ - int rc = visorchipset_chipset_ready(); - - if (rc != CONTROLVM_RESP_SUCCESS) - rc = -rc; - if (msg_hdr->flags.response_expected) - controlvm_respond(msg_hdr, rc); -} - -static void -chipset_selftest(struct controlvm_message_header *msg_hdr) -{ - int rc = visorchipset_chipset_selftest(); - - if (rc != CONTROLVM_RESP_SUCCESS) - rc = -rc; - if (msg_hdr->flags.response_expected) - controlvm_respond(msg_hdr, rc); -} - -static void -chipset_notready(struct controlvm_message_header *msg_hdr) -{ - int rc = visorchipset_chipset_notready(); - - if (rc != CONTROLVM_RESP_SUCCESS) - rc = -rc; - if (msg_hdr->flags.response_expected) - controlvm_respond(msg_hdr, rc); -} - -/* This is your "one-stop" shop for grabbing the next message from the - * CONTROLVM_QUEUE_EVENT queue in the controlvm channel. - */ -static bool -read_controlvm_event(struct controlvm_message *msg) -{ - if (visorchannel_signalremove(controlvm_channel, - CONTROLVM_QUEUE_EVENT, msg)) { - /* got a message */ - if (msg->hdr.flags.test_message == 1) - return false; - return true; - } - return false; -} - /* - * The general parahotplug flow works as follows. The visorchipset + * The general parahotplug flow works as follows. The visorchipset * driver receives a DEVICE_CHANGESTATE message from Command - * specifying a physical device to enable or disable. The CONTROLVM + * specifying a physical device to enable or disable. The CONTROLVM * message handler calls parahotplug_process_message, which then adds * the message to a global list and kicks off a udev event which * causes a user level script to enable or disable the specified - * device. The udev script then writes to + * device. The udev script then writes to * /proc/visorchipset/parahotplug, which causes parahotplug_proc_write * to get called, at which point the appropriate CONTROLVM message is * retrieved from the list and responded to. @@ -1467,9 +1143,11 @@ read_controlvm_event(struct controlvm_message *msg) #define PARAHOTPLUG_TIMEOUT_MS 2000 -/* - * Generate unique int to match an outstanding CONTROLVM message with a - * udev script /proc response +/** + * parahotplug_next_id() - generate unique int to match an outstanding CONTROLVM + * message with a udev script /proc response + * + * Return: a unique integer value */ static int parahotplug_next_id(void) @@ -1479,9 +1157,12 @@ parahotplug_next_id(void) return atomic_inc_return(&id); } -/* - * Returns the time (in jiffies) when a CONTROLVM message on the list - * should expire -- PARAHOTPLUG_TIMEOUT_MS in the future +/** + * parahotplug_next_expiration() - returns the time (in jiffies) when a + * CONTROLVM message on the list should expire + * -- PARAHOTPLUG_TIMEOUT_MS in the future + * + * Return: expected expiration time (in jiffies) */ static unsigned long parahotplug_next_expiration(void) @@ -1489,9 +1170,13 @@ parahotplug_next_expiration(void) return jiffies + msecs_to_jiffies(PARAHOTPLUG_TIMEOUT_MS); } -/* - * Create a parahotplug_request, which is basically a wrapper for a - * CONTROLVM_MESSAGE that we can stick on a list +/** + * parahotplug_request_create() - create a parahotplug_request, which is + * basically a wrapper for a CONTROLVM_MESSAGE + * that we can stick on a list + * @msg: the message to insert in the request + * + * Return: the request containing the provided message */ static struct parahotplug_request * parahotplug_request_create(struct controlvm_message *msg) @@ -1509,8 +1194,9 @@ parahotplug_request_create(struct controlvm_message *msg) return req; } -/* - * Free a parahotplug_request. +/** + * parahotplug_request_destroy() - free a parahotplug_request + * @req: the request to deallocate */ static void parahotplug_request_destroy(struct parahotplug_request *req) @@ -1518,71 +1204,19 @@ parahotplug_request_destroy(struct parahotplug_request *req) kfree(req); } -/* - * Cause uevent to run the user level script to do the disable/enable - * specified in (the CONTROLVM message in) the specified - * parahotplug_request - */ -static void -parahotplug_request_kickoff(struct parahotplug_request *req) -{ - struct controlvm_message_packet *cmd = &req->msg.cmd; - char env_cmd[40], env_id[40], env_state[40], env_bus[40], env_dev[40], - env_func[40]; - char *envp[] = { - env_cmd, env_id, env_state, env_bus, env_dev, env_func, NULL - }; - - sprintf(env_cmd, "SPAR_PARAHOTPLUG=1"); - sprintf(env_id, "SPAR_PARAHOTPLUG_ID=%d", req->id); - sprintf(env_state, "SPAR_PARAHOTPLUG_STATE=%d", - cmd->device_change_state.state.active); - sprintf(env_bus, "SPAR_PARAHOTPLUG_BUS=%d", - cmd->device_change_state.bus_no); - sprintf(env_dev, "SPAR_PARAHOTPLUG_DEVICE=%d", - cmd->device_change_state.dev_no >> 3); - sprintf(env_func, "SPAR_PARAHOTPLUG_FUNCTION=%d", - cmd->device_change_state.dev_no & 0x7); - - kobject_uevent_env(&visorchipset_platform_device.dev.kobj, KOBJ_CHANGE, - envp); -} - -/* - * Remove any request from the list that's been on there too long and - * respond with an error. - */ -static void -parahotplug_process_list(void) -{ - struct list_head *pos; - struct list_head *tmp; - - spin_lock(¶hotplug_request_list_lock); - - list_for_each_safe(pos, tmp, ¶hotplug_request_list) { - struct parahotplug_request *req = - list_entry(pos, struct parahotplug_request, list); - - if (!time_after_eq(jiffies, req->expiration)) - continue; - - list_del(pos); - if (req->msg.hdr.flags.response_expected) - controlvm_respond_physdev_changestate( - &req->msg.hdr, - CONTROLVM_RESP_ERROR_DEVICE_UDEV_TIMEOUT, - req->msg.cmd.device_change_state.state); - parahotplug_request_destroy(req); - } - - spin_unlock(¶hotplug_request_list_lock); -} +static LIST_HEAD(parahotplug_request_list); +static DEFINE_SPINLOCK(parahotplug_request_list_lock); /* lock for above */ -/* +/** + * parahotplug_request_complete() - mark request as complete + * @id: the id of the request + * @active: indicates whether the request is assigned to active partition + * * Called from the /proc handler, which means the user script has - * finished the enable/disable. Find the matching identifier, and + * finished the enable/disable. Find the matching identifier, and * respond to the CONTROLVM message with success. + * + * Return: 0 on success or -EINVAL on failure */ static int parahotplug_request_complete(int id, u16 active) @@ -1597,7 +1231,8 @@ parahotplug_request_complete(int id, u16 active) struct parahotplug_request *req = list_entry(pos, struct parahotplug_request, list); if (req->id == id) { - /* Found a match. Remove it from the list and + /* + * Found a match. Remove it from the list and * respond. */ list_del(pos); @@ -1616,8 +1251,142 @@ parahotplug_request_complete(int id, u16 active) return -EINVAL; } -/* - * Enables or disables a PCI device by kicking off a udev script +/** + * devicedisabled_store() - disables the hotplug device + * @dev: sysfs interface variable not utilized in this function + * @attr: sysfs interface variable not utilized in this function + * @buf: buffer containing the device id + * @count: the size of the buffer + * + * The parahotplug/devicedisabled interface gets called by our support script + * when an SR-IOV device has been shut down. The ID is passed to the script + * and then passed back when the device has been removed. + * + * Return: the size of the buffer for success or negative for error + */ +static ssize_t devicedisabled_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + unsigned int id; + int err; + + if (kstrtouint(buf, 10, &id)) + return -EINVAL; + + err = parahotplug_request_complete(id, 0); + if (err < 0) + return err; + return count; +} +static DEVICE_ATTR_WO(devicedisabled); + +/** + * deviceenabled_store() - enables the hotplug device + * @dev: sysfs interface variable not utilized in this function + * @attr: sysfs interface variable not utilized in this function + * @buf: buffer containing the device id + * @count: the size of the buffer + * + * The parahotplug/deviceenabled interface gets called by our support script + * when an SR-IOV device has been recovered. The ID is passed to the script + * and then passed back when the device has been brought back up. + * + * Return: the size of the buffer for success or negative for error + */ +static ssize_t deviceenabled_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + unsigned int id; + + if (kstrtouint(buf, 10, &id)) + return -EINVAL; + + parahotplug_request_complete(id, 1); + return count; +} +static DEVICE_ATTR_WO(deviceenabled); + +static struct attribute *visorchipset_install_attrs[] = { + &dev_attr_toolaction.attr, + &dev_attr_boottotool.attr, + &dev_attr_error.attr, + &dev_attr_textid.attr, + &dev_attr_remaining_steps.attr, + NULL +}; + +static struct attribute_group visorchipset_install_group = { + .name = "install", + .attrs = visorchipset_install_attrs +}; + +static struct attribute *visorchipset_parahotplug_attrs[] = { + &dev_attr_devicedisabled.attr, + &dev_attr_deviceenabled.attr, + NULL +}; + +static struct attribute_group visorchipset_parahotplug_group = { + .name = "parahotplug", + .attrs = visorchipset_parahotplug_attrs +}; + +static const struct attribute_group *visorchipset_dev_groups[] = { + &visorchipset_install_group, + &visorchipset_parahotplug_group, + NULL +}; + +static void visorchipset_dev_release(struct device *dev) +{ +} + +/* /sys/devices/platform/visorchipset */ +static struct platform_device visorchipset_platform_device = { + .name = "visorchipset", + .id = -1, + .dev.groups = visorchipset_dev_groups, + .dev.release = visorchipset_dev_release, +}; + +/** + * parahotplug_request_kickoff() - initiate parahotplug request + * @req: the request to initiate + * + * Cause uevent to run the user level script to do the disable/enable specified + * in the parahotplug_request. + */ +static void +parahotplug_request_kickoff(struct parahotplug_request *req) +{ + struct controlvm_message_packet *cmd = &req->msg.cmd; + char env_cmd[40], env_id[40], env_state[40], env_bus[40], env_dev[40], + env_func[40]; + char *envp[] = { + env_cmd, env_id, env_state, env_bus, env_dev, env_func, NULL + }; + + sprintf(env_cmd, "SPAR_PARAHOTPLUG=1"); + sprintf(env_id, "SPAR_PARAHOTPLUG_ID=%d", req->id); + sprintf(env_state, "SPAR_PARAHOTPLUG_STATE=%d", + cmd->device_change_state.state.active); + sprintf(env_bus, "SPAR_PARAHOTPLUG_BUS=%d", + cmd->device_change_state.bus_no); + sprintf(env_dev, "SPAR_PARAHOTPLUG_DEVICE=%d", + cmd->device_change_state.dev_no >> 3); + sprintf(env_func, "SPAR_PARAHOTPLUG_FUNCTION=%d", + cmd->device_change_state.dev_no & 0x7); + + kobject_uevent_env(&visorchipset_platform_device.dev.kobj, KOBJ_CHANGE, + envp); +} + +/** + * parahotplug_process_message() - enables or disables a PCI device by kicking + * off a udev script + * @inmsg: the message indicating whether to enable or disable */ static void parahotplug_process_message(struct controlvm_message *inmsg) @@ -1630,14 +1399,16 @@ parahotplug_process_message(struct controlvm_message *inmsg) return; if (inmsg->cmd.device_change_state.state.active) { - /* For enable messages, just respond with success - * right away. This is a bit of a hack, but there are - * issues with the early enable messages we get (with - * either the udev script not detecting that the device - * is up, or not getting called at all). Fortunately - * the messages that get lost don't matter anyway, as - * devices are automatically enabled at - * initialization. + /* + * For enable messages, just respond with success + * right away. This is a bit of a hack, but there are + * issues with the early enable messages we get (with + * either the udev script not detecting that the device + * is up, or not getting called at all). Fortunately + * the messages that get lost don't matter anyway, as + * + * devices are automatically enabled at + * initialization. */ parahotplug_request_kickoff(req); controlvm_respond_physdev_changestate @@ -1646,11 +1417,12 @@ parahotplug_process_message(struct controlvm_message *inmsg) inmsg->cmd.device_change_state.state); parahotplug_request_destroy(req); } else { - /* For disable messages, add the request to the - * request list before kicking off the udev script. It - * won't get responded to until the script has - * indicated it's done. - */ + /* + * For disable messages, add the request to the + * request list before kicking off the udev script. It + * won't get responded to until the script has + * indicated it's done. + */ spin_lock(¶hotplug_request_list_lock); list_add_tail(&req->list, ¶hotplug_request_list); spin_unlock(¶hotplug_request_list_lock); @@ -1659,113 +1431,77 @@ parahotplug_process_message(struct controlvm_message *inmsg) } } -/* Process a controlvm message. - * Return result: - * false - this function will return false only in the case where the - * controlvm message was NOT processed, but processing must be - * retried before reading the next controlvm message; a - * scenario where this can occur is when we need to throttle - * the allocation of memory in which to copy out controlvm - * payload data - * true - processing of the controlvm message completed, - * either successfully or with an error. +/** + * visorchipset_chipset_ready() - sends chipset_ready action + * + * Send ACTION=online for DEVPATH=/sys/devices/platform/visorchipset. + * + * Return: CONTROLVM_RESP_SUCCESS */ -static bool -handle_command(struct controlvm_message inmsg, u64 channel_addr) +static int +visorchipset_chipset_ready(void) { - struct controlvm_message_packet *cmd = &inmsg.cmd; - u64 parm_addr; - u32 parm_bytes; - struct parser_context *parser_ctx = NULL; - bool local_addr; - struct controlvm_message ackmsg; + kobject_uevent(&visorchipset_platform_device.dev.kobj, KOBJ_ONLINE); + return CONTROLVM_RESP_SUCCESS; +} - /* create parsing context if necessary */ - local_addr = (inmsg.hdr.flags.test_message == 1); - if (channel_addr == 0) - return true; - parm_addr = channel_addr + inmsg.hdr.payload_vm_offset; - parm_bytes = inmsg.hdr.payload_bytes; +static int +visorchipset_chipset_selftest(void) +{ + char env_selftest[20]; + char *envp[] = { env_selftest, NULL }; - /* Parameter and channel addresses within test messages actually lie - * within our OS-controlled memory. We need to know that, because it - * makes a difference in how we compute the virtual address. - */ - if (parm_addr && parm_bytes) { - bool retry = false; + sprintf(env_selftest, "SPARSP_SELFTEST=%d", 1); + kobject_uevent_env(&visorchipset_platform_device.dev.kobj, KOBJ_CHANGE, + envp); + return CONTROLVM_RESP_SUCCESS; +} - parser_ctx = - parser_init_byte_stream(parm_addr, parm_bytes, - local_addr, &retry); - if (!parser_ctx && retry) - return false; - } +/** + * visorchipset_chipset_notready() - sends chipset_notready action + * + * Send ACTION=offline for DEVPATH=/sys/devices/platform/visorchipset. + * + * Return: CONTROLVM_RESP_SUCCESS + */ +static int +visorchipset_chipset_notready(void) +{ + kobject_uevent(&visorchipset_platform_device.dev.kobj, KOBJ_OFFLINE); + return CONTROLVM_RESP_SUCCESS; +} - if (!local_addr) { - controlvm_init_response(&ackmsg, &inmsg.hdr, - CONTROLVM_RESP_SUCCESS); - if (controlvm_channel) - visorchannel_signalinsert(controlvm_channel, - CONTROLVM_QUEUE_ACK, - &ackmsg); - } - switch (inmsg.hdr.id) { - case CONTROLVM_CHIPSET_INIT: - chipset_init(&inmsg); - break; - case CONTROLVM_BUS_CREATE: - bus_create(&inmsg); - break; - case CONTROLVM_BUS_DESTROY: - bus_destroy(&inmsg); - break; - case CONTROLVM_BUS_CONFIGURE: - bus_configure(&inmsg, parser_ctx); - break; - case CONTROLVM_DEVICE_CREATE: - my_device_create(&inmsg); - break; - case CONTROLVM_DEVICE_CHANGESTATE: - if (cmd->device_change_state.flags.phys_device) { - parahotplug_process_message(&inmsg); - } else { - /* save the hdr and cmd structures for later use */ - /* when sending back the response to Command */ - my_device_changestate(&inmsg); - g_devicechangestate_packet = inmsg.cmd; - break; - } - break; - case CONTROLVM_DEVICE_DESTROY: - my_device_destroy(&inmsg); - break; - case CONTROLVM_DEVICE_CONFIGURE: - /* no op for now, just send a respond that we passed */ - if (inmsg.hdr.flags.response_expected) - controlvm_respond(&inmsg.hdr, CONTROLVM_RESP_SUCCESS); - break; - case CONTROLVM_CHIPSET_READY: - chipset_ready(&inmsg.hdr); - break; - case CONTROLVM_CHIPSET_SELFTEST: - chipset_selftest(&inmsg.hdr); - break; - case CONTROLVM_CHIPSET_STOP: - chipset_notready(&inmsg.hdr); - break; - default: - if (inmsg.hdr.flags.response_expected) - controlvm_respond - (&inmsg.hdr, - -CONTROLVM_RESP_ERROR_MESSAGE_ID_UNKNOWN); - break; - } +static void +chipset_ready(struct controlvm_message_header *msg_hdr) +{ + int rc = visorchipset_chipset_ready(); - if (parser_ctx) { - parser_done(parser_ctx); - parser_ctx = NULL; - } - return true; + if (rc != CONTROLVM_RESP_SUCCESS) + rc = -rc; + if (msg_hdr->flags.response_expected) + controlvm_respond(msg_hdr, rc); +} + +static void +chipset_selftest(struct controlvm_message_header *msg_hdr) +{ + int rc = visorchipset_chipset_selftest(); + + if (rc != CONTROLVM_RESP_SUCCESS) + rc = -rc; + if (msg_hdr->flags.response_expected) + controlvm_respond(msg_hdr, rc); +} + +static void +chipset_notready(struct controlvm_message_header *msg_hdr) +{ + int rc = visorchipset_chipset_notready(); + + if (rc != CONTROLVM_RESP_SUCCESS) + rc = -rc; + if (msg_hdr->flags.response_expected) + controlvm_respond(msg_hdr, rc); } static inline unsigned int @@ -1796,76 +1532,6 @@ static u64 controlvm_get_channel_address(void) } static void -controlvm_periodic_work(struct work_struct *work) -{ - struct controlvm_message inmsg; - bool got_command = false; - bool handle_command_failed = false; - - /* make sure visorbus server is registered for controlvm callbacks */ - if (visorchipset_visorbusregwait && !visorbusregistered) - goto cleanup; - - while (visorchannel_signalremove(controlvm_channel, - CONTROLVM_QUEUE_RESPONSE, - &inmsg)) - ; - if (!got_command) { - if (controlvm_pending_msg_valid) { - /* we throttled processing of a prior - * msg, so try to process it again - * rather than reading a new one - */ - inmsg = controlvm_pending_msg; - controlvm_pending_msg_valid = false; - got_command = true; - } else { - got_command = read_controlvm_event(&inmsg); - } - } - - handle_command_failed = false; - while (got_command && (!handle_command_failed)) { - most_recent_message_jiffies = jiffies; - if (handle_command(inmsg, - visorchannel_get_physaddr - (controlvm_channel))) - got_command = read_controlvm_event(&inmsg); - else { - /* this is a scenario where throttling - * is required, but probably NOT an - * error...; we stash the current - * controlvm msg so we will attempt to - * reprocess it on our next loop - */ - handle_command_failed = true; - controlvm_pending_msg = inmsg; - controlvm_pending_msg_valid = true; - } - } - - /* parahotplug_worker */ - parahotplug_process_list(); - -cleanup: - - if (time_after(jiffies, - most_recent_message_jiffies + (HZ * MIN_IDLE_SECONDS))) { - /* it's been longer than MIN_IDLE_SECONDS since we - * processed our last controlvm message; slow down the - * polling - */ - if (poll_jiffies != POLLJIFFIES_CONTROLVMCHANNEL_SLOW) - poll_jiffies = POLLJIFFIES_CONTROLVMCHANNEL_SLOW; - } else { - if (poll_jiffies != POLLJIFFIES_CONTROLVMCHANNEL_FAST) - poll_jiffies = POLLJIFFIES_CONTROLVMCHANNEL_FAST; - } - - schedule_delayed_work(&periodic_controlvm_work, poll_jiffies); -} - -static void setup_crash_devices_work_queue(struct work_struct *work) { struct controlvm_message local_crash_bus_msg; @@ -1874,13 +1540,6 @@ setup_crash_devices_work_queue(struct work_struct *work) u32 local_crash_msg_offset; u16 local_crash_msg_count; - /* make sure visorbus is registered for controlvm callbacks */ - if (visorchipset_visorbusregwait && !visorbusregistered) { - poll_jiffies = POLLJIFFIES_CONTROLVMCHANNEL_SLOW; - schedule_delayed_work(&periodic_controlvm_work, poll_jiffies); - return; - } - POSTCODE_LINUX_2(CRASH_DEV_ENTRY_PC, POSTCODE_SEVERITY_INFO); /* send init chipset msg */ @@ -1958,7 +1617,7 @@ setup_crash_devices_work_queue(struct work_struct *work) POSTCODE_LINUX_2(CRASH_DEV_EXIT_PC, POSTCODE_SEVERITY_INFO); } -static void +void bus_create_response(struct visor_device *bus_info, int response) { if (response >= 0) @@ -1971,7 +1630,7 @@ bus_create_response(struct visor_device *bus_info, int response) bus_info->pending_msg_hdr = NULL; } -static void +void bus_destroy_response(struct visor_device *bus_info, int response) { bus_responder(CONTROLVM_BUS_DESTROY, bus_info->pending_msg_hdr, @@ -1981,7 +1640,7 @@ bus_destroy_response(struct visor_device *bus_info, int response) bus_info->pending_msg_hdr = NULL; } -static void +void device_create_response(struct visor_device *dev_info, int response) { if (response >= 0) @@ -1994,7 +1653,7 @@ device_create_response(struct visor_device *dev_info, int response) dev_info->pending_msg_hdr = NULL; } -static void +void device_destroy_response(struct visor_device *dev_info, int response) { device_responder(CONTROLVM_DEVICE_DESTROY, dev_info->pending_msg_hdr, @@ -2004,9 +1663,9 @@ device_destroy_response(struct visor_device *dev_info, int response) dev_info->pending_msg_hdr = NULL; } -static void -visorchipset_device_pause_response(struct visor_device *dev_info, - int response) +void +device_pause_response(struct visor_device *dev_info, + int response) { device_changestate_responder(CONTROLVM_DEVICE_CHANGESTATE, dev_info, response, @@ -2016,7 +1675,7 @@ visorchipset_device_pause_response(struct visor_device *dev_info, dev_info->pending_msg_hdr = NULL; } -static void +void device_resume_response(struct visor_device *dev_info, int response) { device_changestate_responder(CONTROLVM_DEVICE_CHANGESTATE, @@ -2027,40 +1686,6 @@ device_resume_response(struct visor_device *dev_info, int response) dev_info->pending_msg_hdr = NULL; } -/* The parahotplug/devicedisabled interface gets called by our support script - * when an SR-IOV device has been shut down. The ID is passed to the script - * and then passed back when the device has been removed. - */ -static ssize_t devicedisabled_store(struct device *dev, - struct device_attribute *attr, - const char *buf, size_t count) -{ - unsigned int id; - - if (kstrtouint(buf, 10, &id)) - return -EINVAL; - - parahotplug_request_complete(id, 0); - return count; -} - -/* The parahotplug/deviceenabled interface gets called by our support script - * when an SR-IOV device has been recovered. The ID is passed to the script - * and then passed back when the device has been brought back up. - */ -static ssize_t deviceenabled_store(struct device *dev, - struct device_attribute *attr, - const char *buf, size_t count) -{ - unsigned int id; - - if (kstrtouint(buf, 10, &id)) - return -EINVAL; - - parahotplug_request_complete(id, 1); - return count; -} - static int visorchipset_mmap(struct file *file, struct vm_area_struct *vma) { @@ -2191,6 +1816,298 @@ visorchipset_file_cleanup(dev_t major_dev) unregister_chrdev_region(major_dev, 1); } +static struct parser_context * +parser_init_byte_stream(u64 addr, u32 bytes, bool local, bool *retry) +{ + int allocbytes = sizeof(struct parser_context) + bytes; + struct parser_context *ctx; + + if (retry) + *retry = false; + + /* + * alloc an 0 extra byte to ensure payload is + * '\0'-terminated + */ + allocbytes++; + if ((controlvm_payload_bytes_buffered + bytes) + > MAX_CONTROLVM_PAYLOAD_BYTES) { + if (retry) + *retry = true; + return NULL; + } + ctx = kzalloc(allocbytes, GFP_KERNEL | __GFP_NORETRY); + if (!ctx) { + if (retry) + *retry = true; + return NULL; + } + + ctx->allocbytes = allocbytes; + ctx->param_bytes = bytes; + ctx->curr = NULL; + ctx->bytes_remaining = 0; + ctx->byte_stream = false; + if (local) { + void *p; + + if (addr > virt_to_phys(high_memory - 1)) + goto err_finish_ctx; + p = __va((unsigned long)(addr)); + memcpy(ctx->data, p, bytes); + } else { + void *mapping = memremap(addr, bytes, MEMREMAP_WB); + + if (!mapping) + goto err_finish_ctx; + memcpy(ctx->data, mapping, bytes); + memunmap(mapping); + } + + ctx->byte_stream = true; + controlvm_payload_bytes_buffered += ctx->param_bytes; + + return ctx; + +err_finish_ctx: + parser_done(ctx); + return NULL; +} + +/** + * handle_command() - process a controlvm message + * @inmsg: the message to process + * @channel_addr: address of the controlvm channel + * + * Return: + * false - this function will return false only in the case where the + * controlvm message was NOT processed, but processing must be + * retried before reading the next controlvm message; a + * scenario where this can occur is when we need to throttle + * the allocation of memory in which to copy out controlvm + * payload data + * true - processing of the controlvm message completed, + * either successfully or with an error + */ +static bool +handle_command(struct controlvm_message inmsg, u64 channel_addr) +{ + struct controlvm_message_packet *cmd = &inmsg.cmd; + u64 parm_addr; + u32 parm_bytes; + struct parser_context *parser_ctx = NULL; + bool local_addr; + struct controlvm_message ackmsg; + + /* create parsing context if necessary */ + local_addr = (inmsg.hdr.flags.test_message == 1); + if (channel_addr == 0) + return true; + parm_addr = channel_addr + inmsg.hdr.payload_vm_offset; + parm_bytes = inmsg.hdr.payload_bytes; + + /* + * Parameter and channel addresses within test messages actually lie + * within our OS-controlled memory. We need to know that, because it + * makes a difference in how we compute the virtual address. + */ + if (parm_addr && parm_bytes) { + bool retry = false; + + parser_ctx = + parser_init_byte_stream(parm_addr, parm_bytes, + local_addr, &retry); + if (!parser_ctx && retry) + return false; + } + + if (!local_addr) { + controlvm_init_response(&ackmsg, &inmsg.hdr, + CONTROLVM_RESP_SUCCESS); + if (controlvm_channel) + visorchannel_signalinsert(controlvm_channel, + CONTROLVM_QUEUE_ACK, + &ackmsg); + } + switch (inmsg.hdr.id) { + case CONTROLVM_CHIPSET_INIT: + chipset_init(&inmsg); + break; + case CONTROLVM_BUS_CREATE: + bus_create(&inmsg); + break; + case CONTROLVM_BUS_DESTROY: + bus_destroy(&inmsg); + break; + case CONTROLVM_BUS_CONFIGURE: + bus_configure(&inmsg, parser_ctx); + break; + case CONTROLVM_DEVICE_CREATE: + my_device_create(&inmsg); + break; + case CONTROLVM_DEVICE_CHANGESTATE: + if (cmd->device_change_state.flags.phys_device) { + parahotplug_process_message(&inmsg); + } else { + /* + * save the hdr and cmd structures for later use + * when sending back the response to Command + */ + my_device_changestate(&inmsg); + break; + } + break; + case CONTROLVM_DEVICE_DESTROY: + my_device_destroy(&inmsg); + break; + case CONTROLVM_DEVICE_CONFIGURE: + /* no op for now, just send a respond that we passed */ + if (inmsg.hdr.flags.response_expected) + controlvm_respond(&inmsg.hdr, CONTROLVM_RESP_SUCCESS); + break; + case CONTROLVM_CHIPSET_READY: + chipset_ready(&inmsg.hdr); + break; + case CONTROLVM_CHIPSET_SELFTEST: + chipset_selftest(&inmsg.hdr); + break; + case CONTROLVM_CHIPSET_STOP: + chipset_notready(&inmsg.hdr); + break; + default: + if (inmsg.hdr.flags.response_expected) + controlvm_respond + (&inmsg.hdr, + -CONTROLVM_RESP_ERROR_MESSAGE_ID_UNKNOWN); + break; + } + + if (parser_ctx) { + parser_done(parser_ctx); + parser_ctx = NULL; + } + return true; +} + +/** + * read_controlvm_event() - retreives the next message from the + * CONTROLVM_QUEUE_EVENT queue in the controlvm + * channel + * @msg: pointer to the retrieved message + * + * Return: true if a valid message was retrieved or false otherwise + */ +static bool +read_controlvm_event(struct controlvm_message *msg) +{ + if (!visorchannel_signalremove(controlvm_channel, + CONTROLVM_QUEUE_EVENT, msg)) { + /* got a message */ + if (msg->hdr.flags.test_message == 1) + return false; + return true; + } + return false; +} + +/** + * parahotplug_process_list() - remove any request from the list that's been on + * there too long and respond with an error + */ +static void +parahotplug_process_list(void) +{ + struct list_head *pos; + struct list_head *tmp; + + spin_lock(¶hotplug_request_list_lock); + + list_for_each_safe(pos, tmp, ¶hotplug_request_list) { + struct parahotplug_request *req = + list_entry(pos, struct parahotplug_request, list); + + if (!time_after_eq(jiffies, req->expiration)) + continue; + + list_del(pos); + if (req->msg.hdr.flags.response_expected) + controlvm_respond_physdev_changestate( + &req->msg.hdr, + CONTROLVM_RESP_ERROR_DEVICE_UDEV_TIMEOUT, + req->msg.cmd.device_change_state.state); + parahotplug_request_destroy(req); + } + + spin_unlock(¶hotplug_request_list_lock); +} + +static void +controlvm_periodic_work(struct work_struct *work) +{ + struct controlvm_message inmsg; + bool got_command = false; + bool handle_command_failed = false; + + while (!visorchannel_signalremove(controlvm_channel, + CONTROLVM_QUEUE_RESPONSE, + &inmsg)) + ; + if (!got_command) { + if (controlvm_pending_msg_valid) { + /* + * we throttled processing of a prior + * msg, so try to process it again + * rather than reading a new one + */ + inmsg = controlvm_pending_msg; + controlvm_pending_msg_valid = false; + got_command = true; + } else { + got_command = read_controlvm_event(&inmsg); + } + } + + handle_command_failed = false; + while (got_command && (!handle_command_failed)) { + most_recent_message_jiffies = jiffies; + if (handle_command(inmsg, + visorchannel_get_physaddr + (controlvm_channel))) + got_command = read_controlvm_event(&inmsg); + else { + /* + * this is a scenario where throttling + * is required, but probably NOT an + * error...; we stash the current + * controlvm msg so we will attempt to + * reprocess it on our next loop + */ + handle_command_failed = true; + controlvm_pending_msg = inmsg; + controlvm_pending_msg_valid = true; + } + } + + /* parahotplug_worker */ + parahotplug_process_list(); + + if (time_after(jiffies, + most_recent_message_jiffies + (HZ * MIN_IDLE_SECONDS))) { + /* + * it's been longer than MIN_IDLE_SECONDS since we + * processed our last controlvm message; slow down the + * polling + */ + if (poll_jiffies != POLLJIFFIES_CONTROLVMCHANNEL_SLOW) + poll_jiffies = POLLJIFFIES_CONTROLVMCHANNEL_SLOW; + } else { + if (poll_jiffies != POLLJIFFIES_CONTROLVMCHANNEL_FAST) + poll_jiffies = POLLJIFFIES_CONTROLVMCHANNEL_FAST; + } + + schedule_delayed_work(&periodic_controlvm_work, poll_jiffies); +} + static int visorchipset_init(struct acpi_device *acpi_device) { @@ -2202,7 +2119,6 @@ visorchipset_init(struct acpi_device *acpi_device) if (!addr) goto error; - memset(&busdev_notifiers, 0, sizeof(busdev_notifiers)); memset(&controlvm_payload_info, 0, sizeof(controlvm_payload_info)); controlvm_channel = visorchannel_create_with_lock(addr, 0, @@ -2341,15 +2257,10 @@ static void exit_unisys(void) module_param_named(major, visorchipset_major, int, S_IRUGO); MODULE_PARM_DESC(visorchipset_major, "major device number to use for the device node"); -module_param_named(visorbusregwait, visorchipset_visorbusregwait, int, S_IRUGO); -MODULE_PARM_DESC(visorchipset_visorbusregwait, - "1 to have the module wait for the visor bus to register"); module_init(init_unisys); module_exit(exit_unisys); MODULE_AUTHOR("Unisys"); MODULE_LICENSE("GPL"); -MODULE_DESCRIPTION("Supervisor chipset driver for service partition: ver " - VERSION); -MODULE_VERSION(VERSION); +MODULE_DESCRIPTION("s-Par visorbus driver for virtual device buses"); |