diff options
| -rw-r--r-- | drivers/misc/ocxl/afu_irq.c | 74 | ||||
| -rw-r--r-- | drivers/misc/ocxl/file.c | 22 | ||||
| -rw-r--r-- | drivers/misc/ocxl/ocxl_internal.h | 5 | ||||
| -rw-r--r-- | include/misc/ocxl.h | 46 |
4 files changed, 109 insertions, 38 deletions
diff --git a/drivers/misc/ocxl/afu_irq.c b/drivers/misc/ocxl/afu_irq.c index 2d410cd6f817..70f8f1c3929d 100644 --- a/drivers/misc/ocxl/afu_irq.c +++ b/drivers/misc/ocxl/afu_irq.c @@ -1,7 +1,7 @@ // SPDX-License-Identifier: GPL-2.0+ // Copyright 2017 IBM Corp. #include <linux/interrupt.h> -#include <linux/eventfd.h> +#include <asm/pnv-ocxl.h> #include "ocxl_internal.h" #include "trace.h" @@ -11,7 +11,9 @@ struct afu_irq { unsigned int virq; char *name; u64 trigger_page; - struct eventfd_ctx *ev_ctx; + irqreturn_t (*handler)(void *private); + void (*free_private)(void *private); + void *private; }; int ocxl_irq_offset_to_id(struct ocxl_context *ctx, u64 offset) @@ -24,14 +26,44 @@ u64 ocxl_irq_id_to_offset(struct ocxl_context *ctx, int irq_id) return ctx->afu->irq_base_offset + (irq_id << PAGE_SHIFT); } +int ocxl_irq_set_handler(struct ocxl_context *ctx, int irq_id, + irqreturn_t (*handler)(void *private), + void (*free_private)(void *private), + void *private) +{ + struct afu_irq *irq; + int rc; + + mutex_lock(&ctx->irq_lock); + irq = idr_find(&ctx->irq_idr, irq_id); + if (!irq) { + rc = -EINVAL; + goto unlock; + } + + irq->handler = handler; + irq->private = private; + irq->free_private = free_private; + + rc = 0; + // Fall through to unlock + +unlock: + mutex_unlock(&ctx->irq_lock); + return rc; +} +EXPORT_SYMBOL_GPL(ocxl_irq_set_handler); + static irqreturn_t afu_irq_handler(int virq, void *data) { struct afu_irq *irq = (struct afu_irq *) data; trace_ocxl_afu_irq_receive(virq); - if (irq->ev_ctx) - eventfd_signal(irq->ev_ctx, 1); - return IRQ_HANDLED; + + if (irq->handler) + return irq->handler(irq->private); + + return IRQ_HANDLED; // Just drop it on the ground } static int setup_afu_irq(struct ocxl_context *ctx, struct afu_irq *irq) @@ -117,6 +149,7 @@ err_unlock: kfree(irq); return rc; } +EXPORT_SYMBOL_GPL(ocxl_afu_irq_alloc); static void afu_irq_free(struct afu_irq *irq, struct ocxl_context *ctx) { @@ -126,8 +159,8 @@ static void afu_irq_free(struct afu_irq *irq, struct ocxl_context *ctx) ocxl_irq_id_to_offset(ctx, irq->id), 1 << PAGE_SHIFT, 1); release_afu_irq(irq); - if (irq->ev_ctx) - eventfd_ctx_put(irq->ev_ctx); + if (irq->free_private) + irq->free_private(irq->private); ocxl_link_free_irq(ctx->afu->fn->link, irq->hw_irq); kfree(irq); } @@ -148,6 +181,7 @@ int ocxl_afu_irq_free(struct ocxl_context *ctx, int irq_id) mutex_unlock(&ctx->irq_lock); return 0; } +EXPORT_SYMBOL_GPL(ocxl_afu_irq_free); void ocxl_afu_irq_free_all(struct ocxl_context *ctx) { @@ -160,31 +194,6 @@ void ocxl_afu_irq_free_all(struct ocxl_context *ctx) mutex_unlock(&ctx->irq_lock); } -int ocxl_afu_irq_set_fd(struct ocxl_context *ctx, int irq_id, int eventfd) -{ - struct afu_irq *irq; - struct eventfd_ctx *ev_ctx; - int rc = 0; - - mutex_lock(&ctx->irq_lock); - irq = idr_find(&ctx->irq_idr, irq_id); - if (!irq) { - rc = -EINVAL; - goto unlock; - } - - ev_ctx = eventfd_ctx_fdget(eventfd); - if (IS_ERR(ev_ctx)) { - rc = -EINVAL; - goto unlock; - } - - irq->ev_ctx = ev_ctx; -unlock: - mutex_unlock(&ctx->irq_lock); - return rc; -} - u64 ocxl_afu_irq_get_addr(struct ocxl_context *ctx, int irq_id) { struct afu_irq *irq; @@ -197,3 +206,4 @@ u64 ocxl_afu_irq_get_addr(struct ocxl_context *ctx, int irq_id) mutex_unlock(&ctx->irq_lock); return addr; } +EXPORT_SYMBOL_GPL(ocxl_afu_irq_get_addr); diff --git a/drivers/misc/ocxl/file.c b/drivers/misc/ocxl/file.c index 7f5282a3af3a..8aa22893ed76 100644 --- a/drivers/misc/ocxl/file.c +++ b/drivers/misc/ocxl/file.c @@ -3,6 +3,7 @@ #include <linux/fs.h> #include <linux/poll.h> #include <linux/sched/signal.h> +#include <linux/eventfd.h> #include <linux/uaccess.h> #include <uapi/misc/ocxl.h> #include <asm/reg.h> @@ -183,11 +184,27 @@ static long afu_ioctl_get_features(struct ocxl_context *ctx, x == OCXL_IOCTL_GET_FEATURES ? "GET_FEATURES" : \ "UNKNOWN") +static irqreturn_t irq_handler(void *private) +{ + struct eventfd_ctx *ev_ctx = private; + + eventfd_signal(ev_ctx, 1); + return IRQ_HANDLED; +} + +static void irq_free(void *private) +{ + struct eventfd_ctx *ev_ctx = private; + + eventfd_ctx_put(ev_ctx); +} + static long afu_ioctl(struct file *file, unsigned int cmd, unsigned long args) { struct ocxl_context *ctx = file->private_data; struct ocxl_ioctl_irq_fd irq_fd; + struct eventfd_ctx *ev_ctx; int irq_id; u64 irq_offset; long rc; @@ -239,7 +256,10 @@ static long afu_ioctl(struct file *file, unsigned int cmd, if (irq_fd.reserved) return -EINVAL; irq_id = ocxl_irq_offset_to_id(ctx, irq_fd.irq_offset); - rc = ocxl_afu_irq_set_fd(ctx, irq_id, irq_fd.eventfd); + ev_ctx = eventfd_ctx_fdget(irq_fd.eventfd); + if (!ev_ctx) + return -EFAULT; + rc = ocxl_irq_set_handler(ctx, irq_id, irq_handler, irq_free, ev_ctx); break; case OCXL_IOCTL_GET_METADATA: diff --git a/drivers/misc/ocxl/ocxl_internal.h b/drivers/misc/ocxl/ocxl_internal.h index 58969467bd5c..97415afd79f3 100644 --- a/drivers/misc/ocxl/ocxl_internal.h +++ b/drivers/misc/ocxl/ocxl_internal.h @@ -139,11 +139,6 @@ void ocxl_sysfs_unregister_afu(struct ocxl_file_info *info); int ocxl_irq_offset_to_id(struct ocxl_context *ctx, u64 offset); u64 ocxl_irq_id_to_offset(struct ocxl_context *ctx, int irq_id); -int ocxl_afu_irq_alloc(struct ocxl_context *ctx, int *irq_id); -int ocxl_afu_irq_free(struct ocxl_context *ctx, int irq_id); void ocxl_afu_irq_free_all(struct ocxl_context *ctx); -int ocxl_afu_irq_set_fd(struct ocxl_context *ctx, int irq_id, - int eventfd); -u64 ocxl_afu_irq_get_addr(struct ocxl_context *ctx, int irq_id); #endif /* _OCXL_INTERNAL_H_ */ diff --git a/include/misc/ocxl.h b/include/misc/ocxl.h index e4704632eac5..dea93885a839 100644 --- a/include/misc/ocxl.h +++ b/include/misc/ocxl.h @@ -155,6 +155,52 @@ int ocxl_context_attach(struct ocxl_context *ctx, u64 amr, */ int ocxl_context_detach(struct ocxl_context *ctx); +// AFU IRQs + +/** + * Allocate an IRQ associated with an AFU context + * @ctx: the AFU context + * @irq_id: out, the IRQ ID + * + * Returns 0 on success, negative on failure + */ +extern int ocxl_afu_irq_alloc(struct ocxl_context *ctx, int *irq_id); + +/** + * Frees an IRQ associated with an AFU context + * @ctx: the AFU context + * @irq_id: the IRQ ID + * + * Returns 0 on success, negative on failure + */ +extern int ocxl_afu_irq_free(struct ocxl_context *ctx, int irq_id); + +/** + * Gets the address of the trigger page for an IRQ + * This can then be provided to an AFU which will write to that + * page to trigger the IRQ. + * @ctx: The AFU context that the IRQ is associated with + * @irq_id: The IRQ ID + * + * returns the trigger page address, or 0 if the IRQ is not valid + */ +extern u64 ocxl_afu_irq_get_addr(struct ocxl_context *ctx, int irq_id); + +/** + * Provide a callback to be called when an IRQ is triggered + * @ctx: The AFU context that the IRQ is associated with + * @irq_id: The IRQ ID + * @handler: the callback to be called when the IRQ is triggered + * @free_private: the callback to be called when the IRQ is freed (may be NULL) + * @private: Private data to be passed to the callbacks + * + * Returns 0 on success, negative on failure + */ +int ocxl_irq_set_handler(struct ocxl_context *ctx, int irq_id, + irqreturn_t (*handler)(void *private), + void (*free_private)(void *private), + void *private); + // AFU Metadata /** |