Intel MIC Host Driver, card OS state management.

This patch enables the following features:
a) Boots and shuts down the card via sysfs entries.
b) Allocates and maps a device page for communication with the
   card driver and updates the device page address via scratchpad
   registers.
c) Provides sysfs entries for shutdown status, kernel command line,
   ramdisk and log buffer information.

Co-author: Dasaratharaman Chandramouli <dasaratharaman.chandramouli@intel.com>
Signed-off-by: Ashutosh Dixit <ashutosh.dixit@intel.com>
Signed-off-by: Caz Yokoyama <Caz.Yokoyama@intel.com>
Signed-off-by: Dasaratharaman Chandramouli <dasaratharaman.chandramouli@intel.com>
Signed-off-by: Harshavardhan R Kharche <harshavardhan.r.kharche@intel.com>
Signed-off-by: Nikhil Rao <nikhil.rao@intel.com>
Signed-off-by: Sudeep Dutt <sudeep.dutt@intel.com>
Acked-by: Yaozu (Eddie) Dong <eddie.dong@intel.com>
Reviewed-by: Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 125 insertions, 4 deletions

diff --git a/drivers/misc/mic/host/mic_main.c b/drivers/misc/mic/host/mic_main.c
index 332a15e4215b..998a20ab7e96 100644
--- a/drivers/misc/mic/host/mic_main.c
+++ b/drivers/misc/mic/host/mic_main.c
@@ -26,6 +26,7 @@
 #include <linux/module.h>
 #include <linux/pci.h>
 
+#include <linux/mic_common.h>
 #include "../common/mic_device.h"
 #include "mic_device.h"
 #include "mic_x100.h"
@@ -63,6 +64,60 @@ static struct class *g_mic_class;
 /* Base device node number for MIC devices */
 static dev_t g_mic_devno;
 
+/* Initialize the device page */
+static int mic_dp_init(struct mic_device *mdev)
+{
+	mdev->dp = kzalloc(MIC_DP_SIZE, GFP_KERNEL);
+	if (!mdev->dp) {
+		dev_err(mdev->sdev->parent, "%s %d err %d\n",
+			__func__, __LINE__, -ENOMEM);
+		return -ENOMEM;
+	}
+
+	mdev->dp_dma_addr = mic_map_single(mdev,
+		mdev->dp, MIC_DP_SIZE);
+	if (mic_map_error(mdev->dp_dma_addr)) {
+		kfree(mdev->dp);
+		dev_err(mdev->sdev->parent, "%s %d err %d\n",
+			__func__, __LINE__, -ENOMEM);
+		return -ENOMEM;
+	}
+	mdev->ops->write_spad(mdev, MIC_DPLO_SPAD, mdev->dp_dma_addr);
+	mdev->ops->write_spad(mdev, MIC_DPHI_SPAD, mdev->dp_dma_addr >> 32);
+	return 0;
+}
+
+/* Uninitialize the device page */
+static void mic_dp_uninit(struct mic_device *mdev)
+{
+	mic_unmap_single(mdev, mdev->dp_dma_addr, MIC_DP_SIZE);
+	kfree(mdev->dp);
+}
+
+/**
+ * mic_shutdown_db - Shutdown doorbell interrupt handler.
+ */
+static irqreturn_t mic_shutdown_db(int irq, void *data)
+{
+	struct mic_device *mdev = data;
+	struct mic_bootparam *bootparam = mdev->dp;
+
+	mdev->ops->ack_interrupt(mdev);
+
+	switch (bootparam->shutdown_status) {
+	case MIC_HALTED:
+	case MIC_POWER_OFF:
+	case MIC_RESTART:
+		/* Fall through */
+	case MIC_CRASHED:
+		schedule_work(&mdev->shutdown_work);
+		break;
+	default:
+		break;
+	};
+	return IRQ_HANDLED;
+}
+
 /**
  * mic_ops_init: Initialize HW specific operation tables.
  *
@@ -136,6 +191,26 @@ mic_device_init(struct mic_device *mdev, struct pci_dev *pdev)
 	mic_sysfs_init(mdev);
 	mutex_init(&mdev->mic_mutex);
 	mdev->irq_info.next_avail_src = 0;
+	INIT_WORK(&mdev->reset_trigger_work, mic_reset_trigger_work);
+	INIT_WORK(&mdev->shutdown_work, mic_shutdown_work);
+}
+
+/**
+ * mic_device_uninit - Frees resources allocated during mic_device_init(..)
+ *
+ * @mdev: pointer to mic_device instance
+ *
+ * returns none
+ */
+static void mic_device_uninit(struct mic_device *mdev)
+{
+	/* The cmdline sysfs entry might have allocated cmdline */
+	kfree(mdev->cmdline);
+	kfree(mdev->firmware);
+	kfree(mdev->ramdisk);
+	kfree(mdev->bootmode);
+	flush_work(&mdev->reset_trigger_work);
+	flush_work(&mdev->shutdown_work);
 }
 
 /**
@@ -170,7 +245,7 @@ static int mic_probe(struct pci_dev *pdev,
 	rc = pci_enable_device(pdev);
 	if (rc) {
 		dev_err(&pdev->dev, "failed to enable pci device.\n");
-		goto ida_remove;
+		goto uninit_device;
 	}
 
 	pci_set_master(pdev);
@@ -228,7 +303,40 @@ static int mic_probe(struct pci_dev *pdev,
 			"device_create_with_groups failed rc %d\n", rc);
 		goto smpt_uninit;
 	}
+	mdev->state_sysfs = sysfs_get_dirent(mdev->sdev->kobj.sd,
+		NULL, "state");
+	if (!mdev->state_sysfs) {
+		rc = -ENODEV;
+		dev_err(&pdev->dev, "sysfs_get_dirent failed rc %d\n", rc);
+		goto destroy_device;
+	}
+
+	rc = mic_dp_init(mdev);
+	if (rc) {
+		dev_err(&pdev->dev, "mic_dp_init failed rc %d\n", rc);
+		goto sysfs_put;
+	}
+	mutex_lock(&mdev->mic_mutex);
+
+	mdev->shutdown_db = mic_next_db(mdev);
+	mdev->shutdown_cookie = mic_request_irq(mdev, mic_shutdown_db,
+		"shutdown-interrupt", mdev, mdev->shutdown_db, MIC_INTR_DB);
+	if (IS_ERR(mdev->shutdown_cookie)) {
+		rc = PTR_ERR(mdev->shutdown_cookie);
+		mutex_unlock(&mdev->mic_mutex);
+		goto dp_uninit;
+	}
+	mutex_unlock(&mdev->mic_mutex);
+	mic_bootparam_init(mdev);
+
+	mic_create_debug_dir(mdev);
 	return 0;
+dp_uninit:
+	mic_dp_uninit(mdev);
+sysfs_put:
+	sysfs_put(mdev->state_sysfs);
+destroy_device:
+	device_destroy(g_mic_class, MKDEV(MAJOR(g_mic_devno), mdev->id));
 smpt_uninit:
 	mic_smpt_uninit(mdev);
 free_interrupts:
@@ -241,7 +349,8 @@ release_regions:
 	pci_release_regions(pdev);
 disable_device:
 	pci_disable_device(pdev);
-ida_remove:
+uninit_device:
+	mic_device_uninit(mdev);
 	ida_simple_remove(&g_mic_ida, mdev->id);
 ida_fail:
 	kfree(mdev);
@@ -265,11 +374,20 @@ static void mic_remove(struct pci_dev *pdev)
 	if (!mdev)
 		return;
 
+	mic_stop(mdev, false);
+	mic_delete_debug_dir(mdev);
+	mutex_lock(&mdev->mic_mutex);
+	mic_free_irq(mdev, mdev->shutdown_cookie, mdev);
+	mutex_unlock(&mdev->mic_mutex);
+	flush_work(&mdev->shutdown_work);
+	mic_dp_uninit(mdev);
+	sysfs_put(mdev->state_sysfs);
 	device_destroy(g_mic_class, MKDEV(MAJOR(g_mic_devno), mdev->id));
 	mic_smpt_uninit(mdev);
 	mic_free_interrupts(mdev, pdev);
 	iounmap(mdev->mmio.va);
 	iounmap(mdev->aper.va);
+	mic_device_uninit(mdev);
 	pci_release_regions(pdev);
 	pci_disable_device(pdev);
 	ida_simple_remove(&g_mic_ida, mdev->id);
@@ -300,14 +418,16 @@ static int __init mic_init(void)
 		goto cleanup_chrdev;
 	}
 
+	mic_init_debugfs();
 	ida_init(&g_mic_ida);
 	ret = pci_register_driver(&mic_driver);
 	if (ret) {
 		pr_err("pci_register_driver failed ret %d\n", ret);
-		goto class_destroy;
+		goto cleanup_debugfs;
 	}
 	return ret;
-class_destroy:
+cleanup_debugfs:
+	mic_exit_debugfs();
 	class_destroy(g_mic_class);
 cleanup_chrdev:
 	unregister_chrdev_region(g_mic_devno, MIC_MAX_NUM_DEVS);
@@ -319,6 +439,7 @@ static void __exit mic_exit(void)
 {
 	pci_unregister_driver(&mic_driver);
 	ida_destroy(&g_mic_ida);
+	mic_exit_debugfs();
 	class_destroy(g_mic_class);
 	unregister_chrdev_region(g_mic_devno, MIC_MAX_NUM_DEVS);
 }