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Message-Id: <35bec389-2b70-96cb-c5f5-443bf902c9cd@linux.ibm.com>
Date: Wed, 13 Mar 2019 19:20:44 +0100
From: Frederic Barrat <fbarrat@...ux.ibm.com>
To: "Alastair D'Silva" <alastair@....ibm.com>
Cc: "Alastair D'Silva" <alastair@...ilva.org>,
Greg Kurz <groug@...d.org>,
Andrew Donnellan <andrew.donnellan@....ibm.com>,
Arnd Bergmann <arnd@...db.de>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH 2/7] ocxl: Allow external drivers to use OpenCAPI contexts
Le 13/03/2019 à 05:15, Alastair D'Silva a écrit :
> From: Alastair D'Silva <alastair@...ilva.org>
>
> Most OpenCAPI operations require a valid context, so
> exposing these functions to external drivers is necessary.
>
> Signed-off-by: Alastair D'Silva <alastair@...ilva.org>
> Reviewed-by: Greg Kurz <groug@...d.org>
> ---
Patch could also be moved later in the series (same reason as before), but:
Acked-by: Frederic Barrat <fbarrat@...ux.ibm.com>
> drivers/misc/ocxl/context.c | 9 +++++--
> drivers/misc/ocxl/file.c | 2 +-
> drivers/misc/ocxl/ocxl_internal.h | 6 -----
> include/misc/ocxl.h | 44 +++++++++++++++++++++++++++++++
> 4 files changed, 52 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/misc/ocxl/context.c b/drivers/misc/ocxl/context.c
> index 3498a0199bde..1534b56f1db1 100644
> --- a/drivers/misc/ocxl/context.c
> +++ b/drivers/misc/ocxl/context.c
> @@ -8,6 +8,7 @@ struct ocxl_context *ocxl_context_alloc(void)
> {
> return kzalloc(sizeof(struct ocxl_context), GFP_KERNEL);
> }
> +EXPORT_SYMBOL_GPL(ocxl_context_alloc);
>
> int ocxl_context_init(struct ocxl_context *ctx, struct ocxl_afu *afu,
> struct address_space *mapping)
> @@ -43,6 +44,7 @@ int ocxl_context_init(struct ocxl_context *ctx, struct ocxl_afu *afu,
> ocxl_afu_get(afu);
> return 0;
> }
> +EXPORT_SYMBOL_GPL(ocxl_context_init);
>
> /*
> * Callback for when a translation fault triggers an error
> @@ -63,7 +65,7 @@ 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 +77,7 @@ 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 +87,7 @@ 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 +246,7 @@ 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 +284,4 @@ 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 16eb8a60d5c7..865b3d176431 100644
> --- a/drivers/misc/ocxl/file.c
> +++ b/drivers/misc/ocxl/file.c
> @@ -100,7 +100,7 @@ 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 06fd98c989c8..779d15ef60b5 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_add_afu(struct ocxl_afu *afu);
> void ocxl_sysfs_remove_afu(struct ocxl_afu *afu);
> diff --git a/include/misc/ocxl.h b/include/misc/ocxl.h
> index 3b320c39f0af..ebbfe83cd5a6 100644
> --- a/include/misc/ocxl.h
> +++ b/include/misc/ocxl.h
> @@ -51,6 +51,7 @@ struct ocxl_fn_config {
>
> // These are opaque outside the ocxl driver
> struct ocxl_afu;
> +struct ocxl_context;
>
> enum ocxl_endian {
> OCXL_BIG_ENDIAN = 0, /**< AFU data is big-endian */
> @@ -58,6 +59,49 @@ enum ocxl_endian {
> OCXL_HOST_ENDIAN = 2, /**< AFU data is the same endianness as the host */
> };
>
> +/**
> + * Allocate space for a new OpenCAPI context
> + *
> + * Returns NULL on failure
> + */
> +struct ocxl_context *ocxl_context_alloc(void);
> +
> +/**
> + * Initialize an OpenCAPI context
> + *
> + * @ctx: The OpenCAPI context to initialize
> + * @afu: The AFU the context belongs to
> + * @mapping: The mapping to unmap when the context is closed (may be NULL)
> + */
> +int ocxl_context_init(struct ocxl_context *ctx, 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);
> +
> /**
> * Read a 32 bit value from global MMIO
> *
>
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