Commit b9721d27 authored by Alastair D'Silva's avatar Alastair D'Silva Committed by Michael Ellerman
Browse files

ocxl: Allow external drivers to use OpenCAPI contexts 



Most OpenCAPI operations require a valid context, so
exposing these functions to external drivers is necessary.

Signed-off-by: default avatarAlastair D'Silva <alastair@d-silva.org>
Reviewed-by: default avatarGreg Kurz <groug@kaod.org>
Acked-by: default avatarFrederic Barrat <fbarrat@linux.ibm.com>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
parent 75ca758a

drivers/misc/ocxl/context.c

+14 −8
Original line number Diff line number Diff line
@@ -4,15 +4,17 @@ 
#include "trace.h"

#include "ocxl_internal.h"



struct ocxl_context *ocxl_context_alloc(void)

{

	return kzalloc(sizeof(struct ocxl_context), GFP_KERNEL);

}



int ocxl_context_init(struct ocxl_context *ctx, struct ocxl_afu *afu,

int ocxl_context_alloc(struct ocxl_context **context, struct ocxl_afu *afu,

		struct address_space *mapping)

{

	int pasid;

	struct ocxl_context *ctx;



	*context = kzalloc(sizeof(struct ocxl_context), GFP_KERNEL);

	if (!*context)

		return -ENOMEM;



	ctx = *context;



	ctx->afu = afu;

	mutex_lock(&afu->contexts_lock);
@@ -43,6 +45,7 @@ int ocxl_context_init(struct ocxl_context *ctx, struct ocxl_afu *afu, 
	ocxl_afu_get(afu);

	return 0;

}

EXPORT_SYMBOL_GPL(ocxl_context_alloc);



/*

 * Callback for when a translation fault triggers an error
@@ -63,7 +66,7 @@ static void xsl_fault_error(void *data, u64 addr, u64 dsisr) 
	wake_up_all(&ctx->events_wq);

}



int ocxl_context_attach(struct ocxl_context *ctx, u64 amr)

int ocxl_context_attach(struct ocxl_context *ctx, u64 amr, struct mm_struct *mm)

{

	int rc;
@@ -75,7 +78,7 @@ int ocxl_context_attach(struct ocxl_context *ctx, u64 amr) 
	}



	rc = ocxl_link_add_pe(ctx->afu->fn->link, ctx->pasid,

			current->mm->context.id, ctx->tidr, amr, current->mm,

			mm->context.id, ctx->tidr, amr, mm,

			xsl_fault_error, ctx);

	if (rc)

		goto out;
@@ -85,6 +88,7 @@ out: 
	mutex_unlock(&ctx->status_mutex);

	return rc;

}

EXPORT_SYMBOL_GPL(ocxl_context_attach);



static vm_fault_t map_afu_irq(struct vm_area_struct *vma, unsigned long address,

		u64 offset, struct ocxl_context *ctx)
@@ -243,6 +247,7 @@ int ocxl_context_detach(struct ocxl_context *ctx) 
	}

	return 0;

}

EXPORT_SYMBOL_GPL(ocxl_context_detach);



void ocxl_context_detach_all(struct ocxl_afu *afu)

{
@@ -280,3 +285,4 @@ void ocxl_context_free(struct ocxl_context *ctx) 
	ocxl_afu_put(ctx->afu);

	kfree(ctx);

}

EXPORT_SYMBOL_GPL(ocxl_context_free);

drivers/misc/ocxl/file.c

+2 −6
Original line number Diff line number Diff line
@@ -61,11 +61,7 @@ static int afu_open(struct inode *inode, struct file *file) 
	if (!info)

		return -ENODEV;



	ctx = ocxl_context_alloc();

	if (!ctx)

		return -ENOMEM;



	rc = ocxl_context_init(ctx, info->afu, inode->i_mapping);

	rc = ocxl_context_alloc(&ctx, info->afu, inode->i_mapping);

	if (rc)

		return rc;
@@ -90,7 +86,7 @@ static long afu_ioctl_attach(struct ocxl_context *ctx, 
		return -EINVAL;



	amr = arg.amr & mfspr(SPRN_UAMOR);

	rc = ocxl_context_attach(ctx, amr);

	rc = ocxl_context_attach(ctx, amr, current->mm);

	return rc;

}

drivers/misc/ocxl/ocxl_internal.h

+0 −6
Original line number Diff line number Diff line
@@ -130,15 +130,9 @@ int ocxl_config_check_afu_index(struct pci_dev *dev, 
 */

int ocxl_link_update_pe(void *link_handle, int pasid, __u16 tid);



struct ocxl_context *ocxl_context_alloc(void);

int ocxl_context_init(struct ocxl_context *ctx, struct ocxl_afu *afu,

			struct address_space *mapping);

int ocxl_context_attach(struct ocxl_context *ctx, u64 amr);

int ocxl_context_mmap(struct ocxl_context *ctx,

			struct vm_area_struct *vma);

int ocxl_context_detach(struct ocxl_context *ctx);

void ocxl_context_detach_all(struct ocxl_afu *afu);

void ocxl_context_free(struct ocxl_context *ctx);



int ocxl_sysfs_register_afu(struct ocxl_file_info *info);

void ocxl_sysfs_unregister_afu(struct ocxl_file_info *info);

include/misc/ocxl.h

+39 −0
Original line number Diff line number Diff line
@@ -48,6 +48,7 @@ struct ocxl_fn_config { 
// These are opaque outside the ocxl driver

struct ocxl_afu;

struct ocxl_fn;

struct ocxl_context;



// Device detection & initialisation
@@ -116,6 +117,44 @@ const struct ocxl_fn_config *ocxl_function_config(struct ocxl_fn *fn); 
 */

void ocxl_function_close(struct ocxl_fn *fn);



// Context allocation



/**

 * Allocate an OpenCAPI context

 *

 * @context: The OpenCAPI context to allocate, must be freed with ocxl_context_free

 * @afu: The AFU the context belongs to

 * @mapping: The mapping to unmap when the context is closed (may be NULL)

 */

int ocxl_context_alloc(struct ocxl_context **context, struct ocxl_afu *afu,

			struct address_space *mapping);



/**

 * Free an OpenCAPI context

 *

 * @ctx: The OpenCAPI context to free

 */

void ocxl_context_free(struct ocxl_context *ctx);



/**

 * Grant access to an MM to an OpenCAPI context

 * @ctx: The OpenCAPI context to attach

 * @amr: The value of the AMR register to restrict access

 * @mm: The mm to attach to the context

 *

 * Returns 0 on success, negative on failure

 */

int ocxl_context_attach(struct ocxl_context *ctx, u64 amr,

				struct mm_struct *mm);



/**

 * Detach an MM from an OpenCAPI context

 * @ctx: The OpenCAPI context to attach

 *

 * Returns 0 on success, negative on failure

 */

int ocxl_context_detach(struct ocxl_context *ctx);



// AFU Metadata



/**

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