staging: unisys: visorbus: added struct visorchipset_device

Added the structure visorchipset_device and moved the globals to
the struct. The visorchipset_init() function saves acpi_device
within this structure.

Reported-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sameer Wadgaonkar <sameer.wadgaonkar@unisys.com>
Signed-off-by: David Kershner <david.kershner@unisys.com>
Reviewed-by: Tim Sell <timothy.sell@unisys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/unisys/visorbus/visorchipset.c b/drivers/staging/unisys/visorbus/visorchipset.c
index 74c41fc3ce71c480491f6a5b315cd7298fc08812..b3c3cddceb12e39f823c2fee3fd8db324c8b4103 100644 (file)
--- a/drivers/staging/unisys/visorbus/visorchipset.c
+++ b/drivers/staging/unisys/visorbus/visorchipset.c
@@ -72,9 +72,6 @@ visorchipset_release(struct inode *inode, struct file *file)
  * 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;
 
 struct parser_context {
        unsigned long allocbytes;
@@ -85,22 +82,28 @@ struct parser_context {
        char data[0];
 };
 
-static struct delayed_work periodic_controlvm_work;
-
-static struct cdev file_cdev;
-static struct visorchannel **file_controlvm_channel;
-
-static struct visorchannel *controlvm_channel;
-static unsigned long controlvm_payload_bytes_buffered;
+struct visorchipset_device {
+       struct acpi_device *acpi_device;
+       unsigned long poll_jiffies;
+       /* when we got our last controlvm message */
+       unsigned long most_recent_message_jiffies;
+       struct delayed_work periodic_controlvm_work;
+       struct cdev file_cdev;
+       struct visorchannel **file_controlvm_channel;
+       struct visorchannel *controlvm_channel;
+       unsigned long controlvm_payload_bytes_buffered;
+       /*
+        * The following variables 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.
+        */
+       struct controlvm_message controlvm_pending_msg;
+       bool controlvm_pending_msg_valid;
+};
 
-/*
- * 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;
+static struct visorchipset_device *chipset_dev;
 
 struct parahotplug_request {
        struct list_head list;
@@ -119,7 +122,7 @@ static ssize_t toolaction_show(struct device *dev,
 {
        u8 tool_action = 0;
 
-       visorchannel_read(controlvm_channel,
+       visorchannel_read(chipset_dev->controlvm_channel,
                          offsetof(struct spar_controlvm_channel_protocol,
                                   tool_action), &tool_action, sizeof(u8));
        return sprintf(buf, "%u\n", tool_action);
@@ -136,7 +139,7 @@ static ssize_t toolaction_store(struct device *dev,
                return -EINVAL;
 
        ret = visorchannel_write
-               (controlvm_channel,
+               (chipset_dev->controlvm_channel,
                 offsetof(struct spar_controlvm_channel_protocol,
                          tool_action),
                 &tool_action, sizeof(u8));
@@ -153,7 +156,7 @@ static ssize_t boottotool_show(struct device *dev,
 {
        struct efi_spar_indication efi_spar_indication;
 
-       visorchannel_read(controlvm_channel,
+       visorchannel_read(chipset_dev->controlvm_channel,
                          offsetof(struct spar_controlvm_channel_protocol,
                                   efi_spar_ind), &efi_spar_indication,
                          sizeof(struct efi_spar_indication));
@@ -172,7 +175,7 @@ static ssize_t boottotool_store(struct device *dev,
 
        efi_spar_indication.boot_to_tool = val;
        ret = visorchannel_write
-               (controlvm_channel,
+               (chipset_dev->controlvm_channel,
                 offsetof(struct spar_controlvm_channel_protocol,
                          efi_spar_ind), &(efi_spar_indication),
                 sizeof(struct efi_spar_indication));
@@ -188,7 +191,7 @@ static ssize_t error_show(struct device *dev, struct device_attribute *attr,
 {
        u32 error = 0;
 
-       visorchannel_read(controlvm_channel,
+       visorchannel_read(chipset_dev->controlvm_channel,
                          offsetof(struct spar_controlvm_channel_protocol,
                                   installation_error),
                          &error, sizeof(u32));
@@ -205,7 +208,7 @@ static ssize_t error_store(struct device *dev, struct device_attribute *attr,
                return -EINVAL;
 
        ret = visorchannel_write
-               (controlvm_channel,
+               (chipset_dev->controlvm_channel,
                 offsetof(struct spar_controlvm_channel_protocol,
                          installation_error),
                 &error, sizeof(u32));
@@ -221,7 +224,7 @@ static ssize_t textid_show(struct device *dev, struct device_attribute *attr,
        u32 text_id = 0;
 
        visorchannel_read
-               (controlvm_channel,
+               (chipset_dev->controlvm_channel,
                 offsetof(struct spar_controlvm_channel_protocol,
                          installation_text_id),
                 &text_id, sizeof(u32));
@@ -238,7 +241,7 @@ static ssize_t textid_store(struct device *dev, struct device_attribute *attr,
                return -EINVAL;
 
        ret = visorchannel_write
-               (controlvm_channel,
+               (chipset_dev->controlvm_channel,
                 offsetof(struct spar_controlvm_channel_protocol,
                          installation_text_id),
                 &text_id, sizeof(u32));
@@ -253,7 +256,7 @@ static ssize_t remaining_steps_show(struct device *dev,
 {
        u16 remaining_steps = 0;
 
-       visorchannel_read(controlvm_channel,
+       visorchannel_read(chipset_dev->controlvm_channel,
                          offsetof(struct spar_controlvm_channel_protocol,
                                   installation_remaining_steps),
                          &remaining_steps, sizeof(u16));
@@ -271,7 +274,7 @@ static ssize_t remaining_steps_store(struct device *dev,
                return -EINVAL;
 
        ret = visorchannel_write
-               (controlvm_channel,
+               (chipset_dev->controlvm_channel,
                 offsetof(struct spar_controlvm_channel_protocol,
                          installation_remaining_steps),
                 &remaining_steps, sizeof(u16));
@@ -292,7 +295,7 @@ parser_id_get(struct parser_context *ctx)
 
 static void parser_done(struct parser_context *ctx)
 {
-       controlvm_payload_bytes_buffered -= ctx->param_bytes;
+       chipset_dev->controlvm_payload_bytes_buffered -= ctx->param_bytes;
        kfree(ctx);
 }
 
@@ -405,7 +408,7 @@ controlvm_respond_chipset_init(struct controlvm_message_header *msg_hdr,
 
        controlvm_init_response(&outmsg, msg_hdr, response);
        outmsg.cmd.init_chipset.features = features;
-       return visorchannel_signalinsert(controlvm_channel,
+       return visorchannel_signalinsert(chipset_dev->controlvm_channel,
                                         CONTROLVM_QUEUE_REQUEST, &outmsg);
 }
 
@@ -455,7 +458,7 @@ controlvm_respond(struct controlvm_message_header *msg_hdr, int response)
        if (outmsg.hdr.flags.test_message == 1)
                return -EINVAL;
 
-       return visorchannel_signalinsert(controlvm_channel,
+       return visorchannel_signalinsert(chipset_dev->controlvm_channel,
                                         CONTROLVM_QUEUE_REQUEST, &outmsg);
 }
 
@@ -468,7 +471,7 @@ static int 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;
-       return visorchannel_signalinsert(controlvm_channel,
+       return visorchannel_signalinsert(chipset_dev->controlvm_channel,
                                         CONTROLVM_QUEUE_REQUEST, &outmsg);
 }
 
@@ -484,7 +487,7 @@ save_crash_message(struct controlvm_message *msg, enum crash_obj_type typ)
        u16 local_crash_msg_count;
        int err;
 
-       err = visorchannel_read(controlvm_channel,
+       err = visorchannel_read(chipset_dev->controlvm_channel,
                                offsetof(struct spar_controlvm_channel_protocol,
                                         saved_crash_message_count),
                                &local_crash_msg_count, sizeof(u16));
@@ -501,7 +504,7 @@ save_crash_message(struct controlvm_message *msg, enum crash_obj_type typ)
                return -EIO;
        }
 
-       err = visorchannel_read(controlvm_channel,
+       err = visorchannel_read(chipset_dev->controlvm_channel,
                                offsetof(struct spar_controlvm_channel_protocol,
                                         saved_crash_message_offset),
                                &local_crash_msg_offset, sizeof(u32));
@@ -514,7 +517,7 @@ save_crash_message(struct controlvm_message *msg, enum crash_obj_type typ)
        switch (typ) {
        case CRASH_DEV:
                local_crash_msg_offset += sizeof(struct controlvm_message);
-               err = visorchannel_write(controlvm_channel,
+               err = visorchannel_write(chipset_dev->controlvm_channel,
                                         local_crash_msg_offset,
                                         msg,
                                         sizeof(struct controlvm_message));
@@ -525,7 +528,7 @@ save_crash_message(struct controlvm_message *msg, enum crash_obj_type typ)
                }
                break;
        case CRASH_BUS:
-               err = visorchannel_write(controlvm_channel,
+               err = visorchannel_write(chipset_dev->controlvm_channel,
                                         local_crash_msg_offset,
                                         msg,
                                         sizeof(struct controlvm_message));
@@ -576,7 +579,7 @@ 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;
 
-       return visorchannel_signalinsert(controlvm_channel,
+       return visorchannel_signalinsert(chipset_dev->controlvm_channel,
                                         CONTROLVM_QUEUE_REQUEST, &outmsg);
 }
 
@@ -1398,7 +1401,7 @@ setup_crash_devices_work_queue(struct work_struct *work)
        chipset_init(&msg);
 
        /* get saved message count */
-       if (visorchannel_read(controlvm_channel,
+       if (visorchannel_read(chipset_dev->controlvm_channel,
                              offsetof(struct spar_controlvm_channel_protocol,
                                       saved_crash_message_count),
                              &local_crash_msg_count, sizeof(u16)) < 0) {
@@ -1415,7 +1418,7 @@ setup_crash_devices_work_queue(struct work_struct *work)
        }
 
        /* get saved crash message offset */
-       if (visorchannel_read(controlvm_channel,
+       if (visorchannel_read(chipset_dev->controlvm_channel,
                              offsetof(struct spar_controlvm_channel_protocol,
                                       saved_crash_message_offset),
                              &local_crash_msg_offset, sizeof(u32)) < 0) {
@@ -1425,7 +1428,7 @@ setup_crash_devices_work_queue(struct work_struct *work)
        }
 
        /* read create device message for storage bus offset */
-       if (visorchannel_read(controlvm_channel,
+       if (visorchannel_read(chipset_dev->controlvm_channel,
                              local_crash_msg_offset,
                              &local_crash_bus_msg,
                              sizeof(struct controlvm_message)) < 0) {
@@ -1435,7 +1438,7 @@ setup_crash_devices_work_queue(struct work_struct *work)
        }
 
        /* read create device message for storage device */
-       if (visorchannel_read(controlvm_channel,
+       if (visorchannel_read(chipset_dev->controlvm_channel,
                              local_crash_msg_offset +
                              sizeof(struct controlvm_message),
                              &local_crash_dev_msg,
@@ -1548,11 +1551,11 @@ visorchipset_mmap(struct file *file, struct vm_area_struct *vma)
        switch (offset) {
        case VISORCHIPSET_MMAP_CONTROLCHANOFFSET:
                vma->vm_flags |= VM_IO;
-               if (!*file_controlvm_channel)
+               if (!*chipset_dev->file_controlvm_channel)
                        return -ENXIO;
 
                visorchannel_read
-                       (*file_controlvm_channel,
+                       (*chipset_dev->file_controlvm_channel,
                         offsetof(struct spar_controlvm_channel_protocol,
                                  gp_control_channel),
                         &addr, sizeof(addr));
@@ -1633,9 +1636,9 @@ visorchipset_file_init(dev_t major_dev, struct visorchannel **controlvm_channel)
 {
        int rc = 0;
 
-       file_controlvm_channel = controlvm_channel;
-       cdev_init(&file_cdev, &visorchipset_fops);
-       file_cdev.owner = THIS_MODULE;
+       chipset_dev->file_controlvm_channel = controlvm_channel;
+       cdev_init(&chipset_dev->file_cdev, &visorchipset_fops);
+       chipset_dev->file_cdev.owner = THIS_MODULE;
        if (MAJOR(major_dev) == 0) {
                rc = alloc_chrdev_region(&major_dev, 0, 1, "visorchipset");
                /* dynamic major device number registration required */
@@ -1647,7 +1650,8 @@ visorchipset_file_init(dev_t major_dev, struct visorchannel **controlvm_channel)
                if (rc < 0)
                        return rc;
        }
-       rc = cdev_add(&file_cdev, MKDEV(MAJOR(major_dev), 0), 1);
+       rc = cdev_add(&chipset_dev->file_cdev,
+                     MKDEV(MAJOR(major_dev), 0), 1);
        if (rc < 0) {
                unregister_chrdev_region(major_dev, 1);
                return rc;
@@ -1658,9 +1662,9 @@ visorchipset_file_init(dev_t major_dev, struct visorchannel **controlvm_channel)
 static void
 visorchipset_file_cleanup(dev_t major_dev)
 {
-       if (file_cdev.ops)
-               cdev_del(&file_cdev);
-       file_cdev.ops = NULL;
+       if (chipset_dev->file_cdev.ops)
+               cdev_del(&chipset_dev->file_cdev);
+       chipset_dev->file_cdev.ops = NULL;
        unregister_chrdev_region(major_dev, 1);
 }
 
@@ -1677,7 +1681,7 @@ parser_init_byte_stream(u64 addr, u32 bytes, bool local, bool *retry)
         * '\0'-terminated
         */
        allocbytes++;
-       if ((controlvm_payload_bytes_buffered + bytes)
+       if ((chipset_dev->controlvm_payload_bytes_buffered + bytes)
            > MAX_CONTROLVM_PAYLOAD_BYTES) {
                *retry = true;
                return NULL;
@@ -1710,7 +1714,7 @@ parser_init_byte_stream(u64 addr, u32 bytes, bool local, bool *retry)
        }
 
        ctx->byte_stream = true;
-       controlvm_payload_bytes_buffered += ctx->param_bytes;
+       chipset_dev->controlvm_payload_bytes_buffered += ctx->param_bytes;
 
        return ctx;
 
@@ -1769,10 +1773,10 @@ handle_command(struct controlvm_message inmsg, u64 channel_addr)
        if (!local_addr) {
                controlvm_init_response(&ackmsg, &inmsg.hdr,
                                        CONTROLVM_RESP_SUCCESS);
-               if (controlvm_channel)
-                       visorchannel_signalinsert(controlvm_channel,
-                                                 CONTROLVM_QUEUE_ACK,
-                                                 &ackmsg);
+               if (chipset_dev->controlvm_channel)
+                       visorchannel_signalinsert(
+                                       chipset_dev->controlvm_channel,
+                                       CONTROLVM_QUEUE_ACK, &ackmsg);
        }
        switch (inmsg.hdr.id) {
        case CONTROLVM_CHIPSET_INIT:
@@ -1844,7 +1848,7 @@ handle_command(struct controlvm_message inmsg, u64 channel_addr)
 static bool
 read_controlvm_event(struct controlvm_message *msg)
 {
-       if (!visorchannel_signalremove(controlvm_channel,
+       if (!visorchannel_signalremove(chipset_dev->controlvm_channel,
                                       CONTROLVM_QUEUE_EVENT, msg)) {
                /* got a message */
                if (msg->hdr.flags.test_message == 1)
@@ -1892,19 +1896,19 @@ controlvm_periodic_work(struct work_struct *work)
        bool got_command = false;
        bool handle_command_failed = false;
 
-       while (!visorchannel_signalremove(controlvm_channel,
+       while (!visorchannel_signalremove(chipset_dev->controlvm_channel,
                                          CONTROLVM_QUEUE_RESPONSE,
                                          &inmsg))
                ;
        if (!got_command) {
-               if (controlvm_pending_msg_valid) {
+               if (chipset_dev->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;
+                       inmsg = chipset_dev->controlvm_pending_msg;
+                       chipset_dev->controlvm_pending_msg_valid = false;
                        got_command = true;
                } else {
                        got_command = read_controlvm_event(&inmsg);
@@ -1913,10 +1917,10 @@ controlvm_periodic_work(struct work_struct *work)
 
        handle_command_failed = false;
        while (got_command && (!handle_command_failed)) {
-               most_recent_message_jiffies = jiffies;
+               chipset_dev->most_recent_message_jiffies = jiffies;
                if (handle_command(inmsg,
                                   visorchannel_get_physaddr
-                                  (controlvm_channel)))
+                                  (chipset_dev->controlvm_channel)))
                        got_command = read_controlvm_event(&inmsg);
                else {
                        /*
@@ -1927,29 +1931,34 @@ controlvm_periodic_work(struct work_struct *work)
                         * reprocess it on our next loop
                         */
                        handle_command_failed = true;
-                       controlvm_pending_msg = inmsg;
-                       controlvm_pending_msg_valid = true;
+                       chipset_dev->controlvm_pending_msg = inmsg;
+                       chipset_dev->controlvm_pending_msg_valid = true;
                }
        }
 
        /* parahotplug_worker */
        parahotplug_process_list();
 
-       if (time_after(jiffies,
-                      most_recent_message_jiffies + (HZ * MIN_IDLE_SECONDS))) {
+       if (time_after(jiffies, chipset_dev->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;
+               if (chipset_dev->poll_jiffies !=
+                                             POLLJIFFIES_CONTROLVMCHANNEL_SLOW)
+                       chipset_dev->poll_jiffies =
+                                             POLLJIFFIES_CONTROLVMCHANNEL_SLOW;
        } else {
-               if (poll_jiffies != POLLJIFFIES_CONTROLVMCHANNEL_FAST)
-                       poll_jiffies = POLLJIFFIES_CONTROLVMCHANNEL_FAST;
+               if (chipset_dev->poll_jiffies !=
+                                             POLLJIFFIES_CONTROLVMCHANNEL_FAST)
+                       chipset_dev->poll_jiffies =
+                                             POLLJIFFIES_CONTROLVMCHANNEL_FAST;
        }
 
-       schedule_delayed_work(&periodic_controlvm_work, poll_jiffies);
+       schedule_delayed_work(&chipset_dev->periodic_controlvm_work,
+                             chipset_dev->poll_jiffies);
 }
 
 static int
@@ -1958,36 +1967,49 @@ visorchipset_init(struct acpi_device *acpi_device)
        int err = -ENODEV;
        u64 addr;
        uuid_le uuid = SPAR_CONTROLVM_CHANNEL_PROTOCOL_UUID;
+       struct visorchannel *controlvm_channel;
 
        addr = controlvm_get_channel_address();
        if (!addr)
                goto error;
 
-       controlvm_channel = visorchannel_create_with_lock(addr, 0,
-                                                         GFP_KERNEL, uuid);
-       if (!controlvm_channel)
+       chipset_dev = kzalloc(sizeof(*chipset_dev), GFP_KERNEL);
+       if (!chipset_dev)
                goto error;
 
+       acpi_device->driver_data = chipset_dev;
+
+       chipset_dev->acpi_device = acpi_device;
+       chipset_dev->poll_jiffies = POLLJIFFIES_CONTROLVMCHANNEL_FAST;
+       controlvm_channel = visorchannel_create_with_lock(addr,
+                                                         0, GFP_KERNEL, uuid);
+
+       if (!controlvm_channel)
+               goto error_free_chipset_dev;
+
+       chipset_dev->controlvm_channel = controlvm_channel;
        if (!SPAR_CONTROLVM_CHANNEL_OK_CLIENT(
                                visorchannel_get_header(controlvm_channel)))
                goto error_destroy_channel;
 
        major_dev = MKDEV(visorchipset_major, 0);
-       err = visorchipset_file_init(major_dev, &controlvm_channel);
+       err = visorchipset_file_init(major_dev,
+                                    &chipset_dev->controlvm_channel);
        if (err < 0)
                goto error_destroy_channel;
 
        /* if booting in a crash kernel */
        if (is_kdump_kernel())
-               INIT_DELAYED_WORK(&periodic_controlvm_work,
+               INIT_DELAYED_WORK(&chipset_dev->periodic_controlvm_work,
                                  setup_crash_devices_work_queue);
        else
-               INIT_DELAYED_WORK(&periodic_controlvm_work,
+               INIT_DELAYED_WORK(&chipset_dev->periodic_controlvm_work,
                                  controlvm_periodic_work);
 
-       most_recent_message_jiffies = jiffies;
-       poll_jiffies = POLLJIFFIES_CONTROLVMCHANNEL_FAST;
-       schedule_delayed_work(&periodic_controlvm_work, poll_jiffies);
+       chipset_dev->most_recent_message_jiffies = jiffies;
+       chipset_dev->poll_jiffies = POLLJIFFIES_CONTROLVMCHANNEL_FAST;
+       schedule_delayed_work(&chipset_dev->periodic_controlvm_work,
+                             chipset_dev->poll_jiffies);
 
        visorchipset_platform_device.dev.devt = major_dev;
        if (platform_device_register(&visorchipset_platform_device) < 0) {
@@ -2008,11 +2030,14 @@ error_unregister:
        platform_device_unregister(&visorchipset_platform_device);
 
 error_cancel_work:
-       cancel_delayed_work_sync(&periodic_controlvm_work);
+       cancel_delayed_work_sync(&chipset_dev->periodic_controlvm_work);
        visorchipset_file_cleanup(major_dev);
 
 error_destroy_channel:
-       visorchannel_destroy(controlvm_channel);
+       visorchannel_destroy(chipset_dev->controlvm_channel);
+
+error_free_chipset_dev:
+       kfree(chipset_dev);
 
 error:
        POSTCODE_LINUX(CHIPSET_INIT_FAILURE_PC, 0, err, DIAG_SEVERITY_ERR);
@@ -2026,12 +2051,14 @@ visorchipset_exit(struct acpi_device *acpi_device)
 
        visorbus_exit();
 
-       cancel_delayed_work_sync(&periodic_controlvm_work);
+       cancel_delayed_work_sync(&chipset_dev->periodic_controlvm_work);
 
-       visorchannel_destroy(controlvm_channel);
+       visorchannel_destroy(chipset_dev->controlvm_channel);
 
        visorchipset_file_cleanup(visorchipset_platform_device.dev.devt);
        platform_device_unregister(&visorchipset_platform_device);
+       kfree(chipset_dev);
+
        POSTCODE_LINUX(DRIVER_EXIT_PC, 0, 0, DIAG_SEVERITY_PRINT);
 
        return 0;