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ocxl: Allow external drivers to use OpenCAPI contexts

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

Signed-off-by: Alastair D'Silva <alastair@d-silva.org>
Reviewed-by: Greg Kurz <groug@kaod.org>
Acked-by: Frederic Barrat <fbarrat@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Alastair D'Silva
2019-03-27 16:31:33 +11:00
committed by Michael Ellerman
parent 75ca758adb
commit b9721d275c
4 changed files with 55 additions and 20 deletions
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39
include/misc/ocxl.h
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@@ -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
/**