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ocxl: Allow external drivers to use OpenCAPI contexts

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

Signed-off-by: Alastair D'Silva <[email protected]>
Reviewed-by: Greg Kurz <[email protected]>
Acked-by: Frederic Barrat <[email protected]>
Signed-off-by: Michael Ellerman <[email protected]>
This commit is contained in:
Alastair D'Silva 2019-03-27 16:31:33 +11:00 • committed by Michael Ellerman
commit b9721d275c
4 changed files with 55 additions and 20 deletions
Download patch file Download diff file Expand all files Collapse all files

22
drivers/misc/ocxl/context.c
View file

@ -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);

8
drivers/misc/ocxl/file.c
View file

@ -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;
}

6
drivers/misc/ocxl/ocxl_internal.h
View file

@ -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);