misc: mic: MIC card driver specific changes to enable SCIF

MIC card driver specific changes to enable SCIF. This patch implements
the SCIF hardware bus operations and registers a SCIF device on the
SCIF hardware bus.

Reviewed-by: Nikhil Rao <nikhil.rao@intel.com>
Signed-off-by: Ashutosh Dixit <ashutosh.dixit@intel.com>
Signed-off-by: Sudeep Dutt <sudeep.dutt@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Sudeep Dutt 2015-04-29 05:32:39 -07:00 committed by Greg Kroah-Hartman
parent 74321d4c99
commit dd8d8d44df
5 changed files with 201 additions and 6 deletions

View file

@ -56,7 +56,7 @@ comment "Intel MIC Card Driver"
config INTEL_MIC_CARD
tristate "Intel MIC Card Driver"
depends on 64BIT && X86 && INTEL_MIC_BUS
depends on 64BIT && X86 && INTEL_MIC_BUS && SCIF_BUS
select VIRTIO
help
This enables card driver support for the Intel Many Integrated

View file

@ -28,6 +28,8 @@
#include <linux/pci.h>
#include <linux/interrupt.h>
#include <linux/reboot.h>
#include <linux/dmaengine.h>
#include <linux/kmod.h>
#include <linux/mic_common.h>
#include "../common/mic_dev.h"
@ -240,6 +242,111 @@ static void mic_uninit_irq(void)
kfree(mdrv->irq_info.irq_usage_count);
}
static inline struct mic_driver *scdev_to_mdrv(struct scif_hw_dev *scdev)
{
return dev_get_drvdata(scdev->dev.parent);
}
static struct mic_irq *
___mic_request_irq(struct scif_hw_dev *scdev,
irqreturn_t (*func)(int irq, void *data),
const char *name, void *data,
int db)
{
return mic_request_card_irq(func, NULL, name, data, db);
}
static void
___mic_free_irq(struct scif_hw_dev *scdev,
struct mic_irq *cookie, void *data)
{
return mic_free_card_irq(cookie, data);
}
static void ___mic_ack_interrupt(struct scif_hw_dev *scdev, int num)
{
struct mic_driver *mdrv = scdev_to_mdrv(scdev);
mic_ack_interrupt(&mdrv->mdev);
}
static int ___mic_next_db(struct scif_hw_dev *scdev)
{
return mic_next_card_db();
}
static void ___mic_send_intr(struct scif_hw_dev *scdev, int db)
{
struct mic_driver *mdrv = scdev_to_mdrv(scdev);
mic_send_intr(&mdrv->mdev, db);
}
static void ___mic_send_p2p_intr(struct scif_hw_dev *scdev, int db,
struct mic_mw *mw)
{
mic_send_p2p_intr(db, mw);
}
static void __iomem *
___mic_ioremap(struct scif_hw_dev *scdev,
phys_addr_t pa, size_t len)
{
struct mic_driver *mdrv = scdev_to_mdrv(scdev);
return mic_card_map(&mdrv->mdev, pa, len);
}
static void ___mic_iounmap(struct scif_hw_dev *scdev, void __iomem *va)
{
struct mic_driver *mdrv = scdev_to_mdrv(scdev);
mic_card_unmap(&mdrv->mdev, va);
}
static struct scif_hw_ops scif_hw_ops = {
.request_irq = ___mic_request_irq,
.free_irq = ___mic_free_irq,
.ack_interrupt = ___mic_ack_interrupt,
.next_db = ___mic_next_db,
.send_intr = ___mic_send_intr,
.send_p2p_intr = ___mic_send_p2p_intr,
.ioremap = ___mic_ioremap,
.iounmap = ___mic_iounmap,
};
static int mic_request_dma_chans(struct mic_driver *mdrv)
{
dma_cap_mask_t mask;
struct dma_chan *chan;
request_module("mic_x100_dma");
dma_cap_zero(mask);
dma_cap_set(DMA_MEMCPY, mask);
do {
chan = dma_request_channel(mask, NULL, NULL);
if (chan) {
mdrv->dma_ch[mdrv->num_dma_ch++] = chan;
if (mdrv->num_dma_ch >= MIC_MAX_DMA_CHAN)
break;
}
} while (chan);
dev_info(mdrv->dev, "DMA channels # %d\n", mdrv->num_dma_ch);
return mdrv->num_dma_ch;
}
static void mic_free_dma_chans(struct mic_driver *mdrv)
{
int i = 0;
for (i = 0; i < mdrv->num_dma_ch; i++) {
dma_release_channel(mdrv->dma_ch[i]);
mdrv->dma_ch[i] = NULL;
}
mdrv->num_dma_ch = 0;
}
/*
* mic_driver_init - MIC driver initialization tasks.
*
@ -248,6 +355,8 @@ static void mic_uninit_irq(void)
int __init mic_driver_init(struct mic_driver *mdrv)
{
int rc;
struct mic_bootparam __iomem *bootparam;
u8 node_id;
g_drv = mdrv;
/*
@ -268,13 +377,32 @@ int __init mic_driver_init(struct mic_driver *mdrv)
rc = mic_shutdown_init();
if (rc)
goto irq_uninit;
if (!mic_request_dma_chans(mdrv)) {
rc = -ENODEV;
goto shutdown_uninit;
}
rc = mic_devices_init(mdrv);
if (rc)
goto shutdown_uninit;
goto dma_free;
bootparam = mdrv->dp;
node_id = ioread8(&bootparam->node_id);
mdrv->scdev = scif_register_device(mdrv->dev, MIC_SCIF_DEV,
NULL, &scif_hw_ops,
0, node_id, &mdrv->mdev.mmio, NULL,
NULL, mdrv->dp, mdrv->dma_ch,
mdrv->num_dma_ch);
if (IS_ERR(mdrv->scdev)) {
rc = PTR_ERR(mdrv->scdev);
goto device_uninit;
}
mic_create_card_debug_dir(mdrv);
atomic_notifier_chain_register(&panic_notifier_list, &mic_panic);
done:
return rc;
device_uninit:
mic_devices_uninit(mdrv);
dma_free:
mic_free_dma_chans(mdrv);
shutdown_uninit:
mic_shutdown_uninit();
irq_uninit:
@ -294,7 +422,9 @@ int __init mic_driver_init(struct mic_driver *mdrv)
void mic_driver_uninit(struct mic_driver *mdrv)
{
mic_delete_card_debug_dir(mdrv);
scif_unregister_device(mdrv->scdev);
mic_devices_uninit(mdrv);
mic_free_dma_chans(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

View file

@ -29,9 +29,9 @@
#include <linux/workqueue.h>
#include <linux/io.h>
#include <linux/irqreturn.h>
#include <linux/interrupt.h>
#include <linux/mic_bus.h>
#include "../bus/scif_bus.h"
/**
* struct mic_intr_info - Contains h/w specific interrupt sources info
@ -73,6 +73,9 @@ struct mic_device {
* @irq_info: The OS specific irq information
* @intr_info: H/W specific interrupt information.
* @dma_mbdev: dma device on the MIC virtual bus.
* @dma_ch - Array of DMA channels
* @num_dma_ch - Number of DMA channels available
* @scdev: SCIF device on the SCIF virtual bus.
*/
struct mic_driver {
char name[20];
@ -84,6 +87,9 @@ struct mic_driver {
struct mic_irq_info irq_info;
struct mic_intr_info intr_info;
struct mbus_device *dma_mbdev;
struct dma_chan *dma_ch[MIC_MAX_DMA_CHAN];
int num_dma_ch;
struct scif_hw_dev *scdev;
};
/**
@ -122,10 +128,11 @@ void mic_driver_uninit(struct mic_driver *mdrv);
int mic_next_card_db(void);
struct mic_irq *
mic_request_card_irq(irq_handler_t handler, irq_handler_t thread_fn,
const char *name, void *data, int intr_src);
const char *name, void *data, int db);
void mic_free_card_irq(struct mic_irq *cookie, void *data);
u32 mic_read_spad(struct mic_device *mdev, unsigned int idx);
void mic_send_intr(struct mic_device *mdev, int doorbell);
void mic_send_p2p_intr(int doorbell, struct mic_mw *mw);
int mic_db_to_irq(struct mic_driver *mdrv, int db);
u32 mic_ack_interrupt(struct mic_device *mdev);
void mic_hw_intr_init(struct mic_driver *mdrv);

View file

@ -70,6 +70,41 @@ void mic_send_intr(struct mic_device *mdev, int doorbell)
(MIC_X100_SBOX_SDBIC0 + (4 * doorbell)));
}
/*
* mic_x100_send_sbox_intr - Send an MIC_X100_SBOX interrupt to MIC.
*/
static void mic_x100_send_sbox_intr(struct mic_mw *mw, int doorbell)
{
u64 apic_icr_offset = MIC_X100_SBOX_APICICR0 + doorbell * 8;
u32 apicicr_low = mic_mmio_read(mw, MIC_X100_SBOX_BASE_ADDRESS +
apic_icr_offset);
/* for MIC we need to make sure we "hit" the send_icr bit (13) */
apicicr_low = (apicicr_low | (1 << 13));
/*
* Ensure that the interrupt is ordered w.r.t. previous stores
* to main memory. Fence instructions are not implemented in X100
* since execution is in order but a compiler barrier is still
* required.
*/
wmb();
mic_mmio_write(mw, apicicr_low,
MIC_X100_SBOX_BASE_ADDRESS + apic_icr_offset);
}
static void mic_x100_send_rdmasr_intr(struct mic_mw *mw, int doorbell)
{
int rdmasr_offset = MIC_X100_SBOX_RDMASR0 + (doorbell << 2);
/*
* Ensure that the interrupt is ordered w.r.t. previous stores
* to main memory. Fence instructions are not implemented in X100
* since execution is in order but a compiler barrier is still
* required.
*/
wmb();
mic_mmio_write(mw, 0, MIC_X100_SBOX_BASE_ADDRESS + rdmasr_offset);
}
/**
* mic_ack_interrupt - Device specific interrupt handling.
* @mdev: pointer to mic_device instance
@ -91,6 +126,18 @@ static inline int mic_get_rdmasr_irq(int index)
return MIC_X100_RDMASR_IRQ_BASE + index;
}
void mic_send_p2p_intr(int db, struct mic_mw *mw)
{
int rdmasr_index;
if (db < MIC_X100_NUM_SBOX_IRQ) {
mic_x100_send_sbox_intr(mw, db);
} else {
rdmasr_index = db - MIC_X100_NUM_SBOX_IRQ;
mic_x100_send_rdmasr_intr(mw, rdmasr_index);
}
}
/**
* mic_hw_intr_init - Initialize h/w specific interrupt
* information.
@ -113,11 +160,15 @@ void mic_hw_intr_init(struct mic_driver *mdrv)
int mic_db_to_irq(struct mic_driver *mdrv, int db)
{
int rdmasr_index;
/*
* The total number of doorbell interrupts on the card are 16. Indices
* 0-8 falls in the SBOX category and 8-15 fall in the RDMASR category.
*/
if (db < MIC_X100_NUM_SBOX_IRQ) {
return mic_get_sbox_irq(db);
} else {
rdmasr_index = db - MIC_X100_NUM_SBOX_IRQ +
MIC_X100_RDMASR_IRQ_BASE;
rdmasr_index = db - MIC_X100_NUM_SBOX_IRQ;
return mic_get_rdmasr_irq(rdmasr_index);
}
}
@ -243,10 +294,16 @@ static void mic_platform_shutdown(struct platform_device *pdev)
mic_remove(pdev);
}
static u64 mic_dma_mask = DMA_BIT_MASK(64);
static struct platform_device mic_platform_dev = {
.name = mic_driver_name,
.id = 0,
.num_resources = 0,
.dev = {
.dma_mask = &mic_dma_mask,
.coherent_dma_mask = DMA_BIT_MASK(64),
},
};
static struct platform_driver __refdata mic_platform_driver = {

View file

@ -35,6 +35,7 @@
#define MIC_X100_SBOX_SDBIC0 0x0000CC90
#define MIC_X100_SBOX_SDBIC0_DBREQ_BIT 0x80000000
#define MIC_X100_SBOX_RDMASR0 0x0000B180
#define MIC_X100_SBOX_APICICR0 0x0000A9D0
#define MIC_X100_MAX_DOORBELL_IDX 8