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Date: Thu, 19 Sep 2019 11:19:30 +1000
From: "Alastair D'Silva" <alastair@....ibm.com>
To: Frederic Barrat <fbarrat@...ux.ibm.com>
Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>,
Paul Mackerras <paulus@...ba.org>,
Michael Ellerman <mpe@...erman.id.au>,
Andrew Donnellan <ajd@...ux.ibm.com>,
Arnd Bergmann <arnd@...db.de>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Thomas Gleixner <tglx@...utronix.de>,
Cédric Le Goater <clg@...d.org>,
Allison Randal <allison@...utok.net>,
Vaibhav Jain <vaibhav@...ux.ibm.com>,
Mahesh Salgaonkar <mahesh@...ux.vnet.ibm.com>,
Anju T Sudhakar <anju@...ux.vnet.ibm.com>,
David Gibson <david@...son.dropbear.id.au>,
Nicholas Piggin <npiggin@...il.com>,
Masahiro Yamada <yamada.masahiro@...ionext.com>,
linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/5] ocxl: Add functions to map/unmap LPC memory
On Wed, 2019-09-18 at 16:03 +0200, Frederic Barrat wrote:
>
> Le 17/09/2019 à 03:43, Alastair D'Silva a écrit :
> > From: Alastair D'Silva <alastair@...ilva.org>
> >
> > Add functions to map/unmap LPC memory
> >
> > Signed-off-by: Alastair D'Silva <alastair@...ilva.org>
> > ---
> > drivers/misc/ocxl/config.c | 4 +++
> > drivers/misc/ocxl/core.c | 50
> > +++++++++++++++++++++++++++++++
> > drivers/misc/ocxl/link.c | 4 +--
> > drivers/misc/ocxl/ocxl_internal.h | 10 +++++--
> > include/misc/ocxl.h | 18 +++++++++++
> > 5 files changed, 82 insertions(+), 4 deletions(-)
> >
> > diff --git a/drivers/misc/ocxl/config.c
> > b/drivers/misc/ocxl/config.c
> > index c8e19bfb5ef9..fb0c3b6f8312 100644
> > --- a/drivers/misc/ocxl/config.c
> > +++ b/drivers/misc/ocxl/config.c
> > @@ -568,6 +568,10 @@ static int read_afu_lpc_memory_info(struct
> > pci_dev *dev,
> > afu->special_purpose_mem_size =
> > total_mem_size - lpc_mem_size;
> > }
> > +
> > + dev_info(&dev->dev, "Probed LPC memory of %#llx bytes and
> > special purpose memory of %#llx bytes\n",
> > + afu->lpc_mem_size, afu->special_purpose_mem_size);
> > +
> > return 0;
> > }
> >
> > diff --git a/drivers/misc/ocxl/core.c b/drivers/misc/ocxl/core.c
> > index fdfe4e0a34e1..eb24bb9d655f 100644
> > --- a/drivers/misc/ocxl/core.c
> > +++ b/drivers/misc/ocxl/core.c
> > @@ -210,6 +210,55 @@ static void unmap_mmio_areas(struct ocxl_afu
> > *afu)
> > release_fn_bar(afu->fn, afu->config.global_mmio_bar);
> > }
> >
> > +int ocxl_map_lpc_mem(struct ocxl_afu *afu)
> > +{
> > + struct pci_dev *dev = to_pci_dev(afu->fn->dev.parent);
> > +
> > + if ((afu->config.lpc_mem_size + afu-
> > >config.special_purpose_mem_size) == 0)
> > + return 0;
> > +
> > + afu->lpc_base_addr = ocxl_link_lpc_online(afu->fn->link, dev);
> > + if (afu->lpc_base_addr == 0)
> > + return -EINVAL;
> > +
> > + if (afu->config.lpc_mem_size) {
> > + afu->lpc_res.start = afu->lpc_base_addr + afu-
> > >config.lpc_mem_offset;
> > + afu->lpc_res.end = afu->lpc_res.start + afu-
> > >config.lpc_mem_size - 1;
> > + }
> > +
> > + if (afu->config.special_purpose_mem_size) {
> > + afu->special_purpose_res.start = afu->lpc_base_addr +
> > + afu-
> > >config.special_purpose_mem_offset;
> > + afu->special_purpose_res.end = afu-
> > >special_purpose_res.start +
> > + afu-
> > >config.special_purpose_mem_size - 1;
> > + }
> > +
> > + return 0;
> > +}
> > +EXPORT_SYMBOL(ocxl_map_lpc_mem);
> > +
> > +struct resource *ocxl_afu_lpc_mem(struct ocxl_afu *afu)
> > +{
> > + return &afu->lpc_res;
> > +}
> > +EXPORT_SYMBOL(ocxl_afu_lpc_mem);
> > +
> > +static void unmap_lpc_mem(struct ocxl_afu *afu)
> > +{
> > + struct pci_dev *dev = to_pci_dev(afu->fn->dev.parent);
> > +
> > + if (afu->lpc_res.start || afu->special_purpose_res.start) {
> > + void *link = afu->fn->link;
> > +
> > + ocxl_link_lpc_offline(link, dev);
> > +
> > + afu->lpc_res.start = 0;
> > + afu->lpc_res.end = 0;
> > + afu->special_purpose_res.start = 0;
> > + afu->special_purpose_res.end = 0;
> > + }
> > +}
> > +
> > static int configure_afu(struct ocxl_afu *afu, u8 afu_idx, struct
> > pci_dev *dev)
> > {
> > int rc;
> > @@ -250,6 +299,7 @@ static int configure_afu(struct ocxl_afu *afu,
> > u8 afu_idx, struct pci_dev *dev)
> >
> > static void deconfigure_afu(struct ocxl_afu *afu)
> > {
> > + unmap_lpc_mem(afu);
> > unmap_mmio_areas(afu);
> > reclaim_afu_pasid(afu);
> > reclaim_afu_actag(afu);
> > diff --git a/drivers/misc/ocxl/link.c b/drivers/misc/ocxl/link.c
> > index 2874811a4398..9e303a5f4d85 100644
> > --- a/drivers/misc/ocxl/link.c
> > +++ b/drivers/misc/ocxl/link.c
> > @@ -738,7 +738,7 @@ int ocxl_link_add_lpc_mem(void *link_handle,
> > u64 size)
> > }
> > EXPORT_SYMBOL_GPL(ocxl_link_add_lpc_mem);
> >
> > -u64 ocxl_link_lpc_map(void *link_handle, struct pci_dev *pdev)
> > +u64 ocxl_link_lpc_online(void *link_handle, struct pci_dev *pdev)
> > {
> > struct ocxl_link *link = (struct ocxl_link *) link_handle;
> >
> > @@ -759,7 +759,7 @@ u64 ocxl_link_lpc_map(void *link_handle, struct
> > pci_dev *pdev)
> > return link->lpc_mem;
> > }
> >
> > -void ocxl_link_lpc_release(void *link_handle, struct pci_dev
> > *pdev)
> > +void ocxl_link_lpc_offline(void *link_handle, struct pci_dev
> > *pdev)
>
> Could we avoid the renaming by squashing it with the previous patch?
>
Yup, good catch.
>
> > {
> > struct ocxl_link *link = (struct ocxl_link *) link_handle;
> >
> > diff --git a/drivers/misc/ocxl/ocxl_internal.h
> > b/drivers/misc/ocxl/ocxl_internal.h
> > index db2647a90fc8..5656a4aab5b7 100644
> > --- a/drivers/misc/ocxl/ocxl_internal.h
> > +++ b/drivers/misc/ocxl/ocxl_internal.h
> > @@ -52,6 +52,12 @@ struct ocxl_afu {
> > void __iomem *global_mmio_ptr;
> > u64 pp_mmio_start;
> > void *private;
> > + u64 lpc_base_addr; /* Covers both LPC & special purpose memory
> > */
> > + struct bin_attribute attr_global_mmio;
> > + struct bin_attribute attr_lpc_mem;
> > + struct resource lpc_res;
> > + struct bin_attribute attr_special_purpose_mem;
> > + struct resource special_purpose_res;
> > };
> >
> > enum ocxl_context_status {
> > @@ -170,7 +176,7 @@ extern u64 ocxl_link_get_lpc_mem_sz(void
> > *link_handle);
> > * @link_handle: The OpenCAPI link handle
> > * @pdev: A device that is on the link
> > */
> > -u64 ocxl_link_lpc_map(void *link_handle, struct pci_dev *pdev);
> > +u64 ocxl_link_lpc_online(void *link_handle, struct pci_dev *pdev);
> >
> > /**
> > * Release the LPC memory device for an OpenCAPI device
> > @@ -181,6 +187,6 @@ u64 ocxl_link_lpc_map(void *link_handle, struct
> > pci_dev *pdev);
> > * @link_handle: The OpenCAPI link handle
> > * @pdev: A device that is on the link
> > */
> > -void ocxl_link_lpc_release(void *link_handle, struct pci_dev
> > *pdev);
> > +void ocxl_link_lpc_offline(void *link_handle, struct pci_dev
> > *pdev);
> >
> > #endif /* _OCXL_INTERNAL_H_ */
> > diff --git a/include/misc/ocxl.h b/include/misc/ocxl.h
> > index 06dd5839e438..a1897737908d 100644
> > --- a/include/misc/ocxl.h
> > +++ b/include/misc/ocxl.h
> > @@ -212,6 +212,24 @@ int ocxl_irq_set_handler(struct ocxl_context
> > *ctx, int irq_id,
> >
> > // AFU Metadata
> >
> > +/**
> > + * Map the LPC system & special purpose memory for an AFU
> > + *
> > + * Do not call this during device discovery, as there may me
> > multiple
> > + * devices on a link, and the memory is mapped for the whole link,
> > not
> > + * just one device. It should only be called after all devices
> > have
> > + * registered their memory on the link.
> > + *
> > + * afu: The AFU that has the LPC memory to map
> > + */
> > +extern int ocxl_map_lpc_mem(struct ocxl_afu *afu);
> > +
> > +/**
> > + * Get the physical address range of LPC memory for an AFU
> > + * afu: The AFU associated with the LPC memory
> > + */
> > +extern struct resource *ocxl_afu_lpc_mem(struct ocxl_afu *afu);
> > +
> > /**
> > * Get a pointer to the config for an AFU
> > *
> >
--
Alastair D'Silva
Open Source Developer
Linux Technology Centre, IBM Australia
mob: 0423 762 819
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