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Subject[PATCH v4 4/7] ocxl: Allow external drivers to use OpenCAPI contexts
Date
From: Alastair D'Silva <alastair@d-silva.org>

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>
---
drivers/misc/ocxl/context.c | 22 ++++++++++-------
drivers/misc/ocxl/file.c | 8 ++-----
drivers/misc/ocxl/ocxl_internal.h | 6 -----
include/misc/ocxl.h | 39 +++++++++++++++++++++++++++++++
4 files changed, 55 insertions(+), 20 deletions(-)

diff --git a/drivers/misc/ocxl/context.c b/drivers/misc/ocxl/context.c
index c73a859d2224..b60e674ac019 100644
--- a/drivers/misc/ocxl/context.c
+++ b/drivers/misc/ocxl/context.c
@@ -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 @@ int ocxl_context_attach(struct ocxl_context *ctx, u64 amr)
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);
diff --git a/drivers/misc/ocxl/file.c b/drivers/misc/ocxl/file.c
index 7a38ea5af9db..8225892a5d77 100644
--- a/drivers/misc/ocxl/file.c
+++ b/drivers/misc/ocxl/file.c
@@ -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;
}

diff --git a/drivers/misc/ocxl/ocxl_internal.h b/drivers/misc/ocxl/ocxl_internal.h
index 53b6c64a1bf0..de6c16237742 100644
--- a/drivers/misc/ocxl/ocxl_internal.h
+++ b/drivers/misc/ocxl/ocxl_internal.h
@@ -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);
diff --git a/include/misc/ocxl.h b/include/misc/ocxl.h
index 8bafd748e380..e4704632eac5 100644
--- a/include/misc/ocxl.h
+++ b/include/misc/ocxl.h
@@ -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

/**
--
2.20.1
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