diff options
Diffstat (limited to 'drivers/misc')
| -rw-r--r-- | drivers/misc/mic/Kconfig | 2 | ||||
| -rw-r--r-- | drivers/misc/mic/card/mic_device.c | 132 | ||||
| -rw-r--r-- | drivers/misc/mic/card/mic_device.h | 11 | ||||
| -rw-r--r-- | drivers/misc/mic/card/mic_x100.c | 61 | ||||
| -rw-r--r-- | drivers/misc/mic/card/mic_x100.h | 1 |
5 files changed, 201 insertions, 6 deletions
diff --git a/drivers/misc/mic/Kconfig b/drivers/misc/mic/Kconfig index a2ea3abb43c2..e9f2f56c370d 100644 --- a/drivers/misc/mic/Kconfig +++ b/drivers/misc/mic/Kconfig @@ -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 diff --git a/drivers/misc/mic/card/mic_device.c b/drivers/misc/mic/card/mic_device.c index 83819eee553b..6338908b2252 100644 --- a/drivers/misc/mic/card/mic_device.c +++ b/drivers/misc/mic/card/mic_device.c @@ -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 @@ put: 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 diff --git a/drivers/misc/mic/card/mic_device.h b/drivers/misc/mic/card/mic_device.h index 844be8fc9b22..1dbf83c41289 100644 --- a/drivers/misc/mic/card/mic_device.h +++ b/drivers/misc/mic/card/mic_device.h @@ -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); diff --git a/drivers/misc/mic/card/mic_x100.c b/drivers/misc/mic/card/mic_x100.c index e98e537d68e3..77fd41781c2e 100644 --- a/drivers/misc/mic/card/mic_x100.c +++ b/drivers/misc/mic/card/mic_x100.c @@ -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 = { diff --git a/drivers/misc/mic/card/mic_x100.h b/drivers/misc/mic/card/mic_x100.h index d66ea55639c3..7e2224934ba8 100644 --- a/drivers/misc/mic/card/mic_x100.h +++ b/drivers/misc/mic/card/mic_x100.h @@ -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 |