--- /dev/null
+/*
+ * Intel MIC Platform Software Stack (MPSS)
+ *
+ * Copyright(c) 2013 Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License, version 2, as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * The full GNU General Public License is included in this distribution in
+ * the file called "COPYING".
+ *
+ * Disclaimer: The codes contained in these modules may be specific to
+ * the Intel Software Development Platform codenamed: Knights Ferry, and
+ * the Intel product codenamed: Knights Corner, and are not backward
+ * compatible with other Intel products. Additionally, Intel will NOT
+ * support the codes or instruction set in future products.
+ *
+ * Intel MIC Card driver.
+ *
+ */
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/interrupt.h>
+#include <linux/reboot.h>
+
+#include <linux/mic_common.h>
+#include "../common/mic_dev.h"
+#include "mic_device.h"
+#include "mic_virtio.h"
+
+static struct mic_driver *g_drv;
+static struct mic_irq *shutdown_cookie;
+
+static void mic_notify_host(u8 state)
+{
+ struct mic_driver *mdrv = g_drv;
+ struct mic_bootparam __iomem *bootparam = mdrv->dp;
+
+ iowrite8(state, &bootparam->shutdown_status);
+ dev_dbg(mdrv->dev, "%s %d system_state %d\n",
+ __func__, __LINE__, state);
+ mic_send_intr(&mdrv->mdev, ioread8(&bootparam->c2h_shutdown_db));
+}
+
+static int mic_panic_event(struct notifier_block *this, unsigned long event,
+ void *ptr)
+{
+ struct mic_driver *mdrv = g_drv;
+ struct mic_bootparam __iomem *bootparam = mdrv->dp;
+
+ iowrite8(-1, &bootparam->h2c_config_db);
+ iowrite8(-1, &bootparam->h2c_shutdown_db);
+ mic_notify_host(MIC_CRASHED);
+ return NOTIFY_DONE;
+}
+
+static struct notifier_block mic_panic = {
+ .notifier_call = mic_panic_event,
+};
+
+static irqreturn_t mic_shutdown_isr(int irq, void *data)
+{
+ struct mic_driver *mdrv = g_drv;
+ struct mic_bootparam __iomem *bootparam = mdrv->dp;
+
+ mic_ack_interrupt(&g_drv->mdev);
+ if (ioread8(&bootparam->shutdown_card))
+ orderly_poweroff(true);
+ return IRQ_HANDLED;
+}
+
+static int mic_shutdown_init(void)
+{
+ int rc = 0;
+ struct mic_driver *mdrv = g_drv;
+ struct mic_bootparam __iomem *bootparam = mdrv->dp;
+ int shutdown_db;
+
+ shutdown_db = mic_next_card_db();
+ shutdown_cookie = mic_request_card_irq(mic_shutdown_isr, NULL,
+ "Shutdown", mdrv, shutdown_db);
+ if (IS_ERR(shutdown_cookie))
+ rc = PTR_ERR(shutdown_cookie);
+ else
+ iowrite8(shutdown_db, &bootparam->h2c_shutdown_db);
+ return rc;
+}
+
+static void mic_shutdown_uninit(void)
+{
+ struct mic_driver *mdrv = g_drv;
+ struct mic_bootparam __iomem *bootparam = mdrv->dp;
+
+ iowrite8(-1, &bootparam->h2c_shutdown_db);
+ mic_free_card_irq(shutdown_cookie, mdrv);
+}
+
+static int __init mic_dp_init(void)
+{
+ struct mic_driver *mdrv = g_drv;
+ struct mic_device *mdev = &mdrv->mdev;
+ struct mic_bootparam __iomem *bootparam;
+ u64 lo, hi, dp_dma_addr;
+ u32 magic;
+
+ lo = mic_read_spad(&mdrv->mdev, MIC_DPLO_SPAD);
+ hi = mic_read_spad(&mdrv->mdev, MIC_DPHI_SPAD);
+
+ dp_dma_addr = lo | (hi << 32);
+ mdrv->dp = mic_card_map(mdev, dp_dma_addr, MIC_DP_SIZE);
+ if (!mdrv->dp) {
+ dev_err(mdrv->dev, "Cannot remap Aperture BAR\n");
+ return -ENOMEM;
+ }
+ bootparam = mdrv->dp;
+ magic = ioread32(&bootparam->magic);
+ if (MIC_MAGIC != magic) {
+ dev_err(mdrv->dev, "bootparam magic mismatch 0x%x\n", magic);
+ return -EIO;
+ }
+ return 0;
+}
+
+/* Uninitialize the device page */
+static void mic_dp_uninit(void)
+{
+ mic_card_unmap(&g_drv->mdev, g_drv->dp);
+}
+
+/**
+ * mic_request_card_irq - request an irq.
+ *
+ * @handler: interrupt handler passed to request_threaded_irq.
+ * @thread_fn: thread fn. passed to request_threaded_irq.
+ * @name: The ASCII name of the callee requesting the irq.
+ * @data: private data that is returned back when calling the
+ * function handler.
+ * @index: The doorbell index of the requester.
+ *
+ * returns: The cookie that is transparent to the caller. Passed
+ * back when calling mic_free_irq. An appropriate error code
+ * is returned on failure. Caller needs to use IS_ERR(return_val)
+ * to check for failure and PTR_ERR(return_val) to obtained the
+ * error code.
+ *
+ */
+struct mic_irq *
+mic_request_card_irq(irq_handler_t handler,
+ irq_handler_t thread_fn, const char *name,
+ void *data, int index)
+{
+ int rc = 0;
+ unsigned long cookie;
+ struct mic_driver *mdrv = g_drv;
+
+ rc = request_threaded_irq(mic_db_to_irq(mdrv, index), handler,
+ thread_fn, 0, name, data);
+ if (rc) {
+ dev_err(mdrv->dev, "request_threaded_irq failed rc = %d\n", rc);
+ goto err;
+ }
+ mdrv->irq_info.irq_usage_count[index]++;
+ cookie = index;
+ return (struct mic_irq *)cookie;
+err:
+ return ERR_PTR(rc);
+}
+
+/**
+ * mic_free_card_irq - free irq.
+ *
+ * @cookie: cookie obtained during a successful call to mic_request_threaded_irq
+ * @data: private data specified by the calling function during the
+ * mic_request_threaded_irq
+ *
+ * returns: none.
+ */
+void mic_free_card_irq(struct mic_irq *cookie, void *data)
+{
+ int index;
+ struct mic_driver *mdrv = g_drv;
+
+ index = (unsigned long)cookie & 0xFFFFU;
+ free_irq(mic_db_to_irq(mdrv, index), data);
+ mdrv->irq_info.irq_usage_count[index]--;
+}
+
+/**
+ * mic_next_card_db - Get the doorbell with minimum usage count.
+ *
+ * Returns the irq index.
+ */
+int mic_next_card_db(void)
+{
+ int i;
+ int index = 0;
+ struct mic_driver *mdrv = g_drv;
+
+ for (i = 0; i < mdrv->intr_info.num_intr; i++) {
+ if (mdrv->irq_info.irq_usage_count[i] <
+ mdrv->irq_info.irq_usage_count[index])
+ index = i;
+ }
+
+ return index;
+}
+
+/**
+ * mic_init_irq - Initialize irq information.
+ *
+ * Returns 0 in success. Appropriate error code on failure.
+ */
+static int mic_init_irq(void)
+{
+ struct mic_driver *mdrv = g_drv;
+
+ mdrv->irq_info.irq_usage_count = kzalloc((sizeof(u32) *
+ mdrv->intr_info.num_intr),
+ GFP_KERNEL);
+ if (!mdrv->irq_info.irq_usage_count)
+ return -ENOMEM;
+ return 0;
+}
+
+/**
+ * mic_uninit_irq - Uninitialize irq information.
+ *
+ * None.
+ */
+static void mic_uninit_irq(void)
+{
+ struct mic_driver *mdrv = g_drv;
+
+ kfree(mdrv->irq_info.irq_usage_count);
+}
+
+/*
+ * mic_driver_init - MIC driver initialization tasks.
+ *
+ * Returns 0 in success. Appropriate error code on failure.
+ */
+int __init mic_driver_init(struct mic_driver *mdrv)
+{
+ int rc;
+
+ g_drv = mdrv;
+ /*
+ * Unloading the card module is not supported. The MIC card module
+ * handles fundamental operations like host/card initiated shutdowns
+ * and informing the host about card crashes and cannot be unloaded.
+ */
+ if (!try_module_get(mdrv->dev->driver->owner)) {
+ rc = -ENODEV;
+ goto done;
+ }
+ rc = mic_dp_init();
+ if (rc)
+ goto put;
+ rc = mic_init_irq();
+ if (rc)
+ goto dp_uninit;
+ rc = mic_shutdown_init();
+ if (rc)
+ goto irq_uninit;
+ rc = mic_devices_init(mdrv);
+ if (rc)
+ goto shutdown_uninit;
+ mic_create_card_debug_dir(mdrv);
+ atomic_notifier_chain_register(&panic_notifier_list, &mic_panic);
+done:
+ return rc;
+shutdown_uninit:
+ mic_shutdown_uninit();
+irq_uninit:
+ mic_uninit_irq();
+dp_uninit:
+ mic_dp_uninit();
+put:
+ module_put(mdrv->dev->driver->owner);
+ return rc;
+}
+
+/*
+ * mic_driver_uninit - MIC driver uninitialization tasks.
+ *
+ * Returns None
+ */
+void mic_driver_uninit(struct mic_driver *mdrv)
+{
+ mic_delete_card_debug_dir(mdrv);
+ mic_devices_uninit(mdrv);
+ /*
+ * Inform the host about the shutdown status i.e. poweroff/restart etc.
+ * The module cannot be unloaded so the only code path to call
+ * mic_devices_uninit(..) is the shutdown callback.
+ */
+ mic_notify_host(system_state);
+ mic_shutdown_uninit();
+ mic_uninit_irq();
+ mic_dp_uninit();
+ module_put(mdrv->dev->driver->owner);
+}
Code Review / kvmfornfv.git / blobdiff