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Date: Mon, 24 Feb 2020 17:08:38 +1100
From: "Alastair D'Silva" <alastair@....ibm.com>
To: Andrew Donnellan <ajd@...ux.ibm.com>
Cc: "Aneesh Kumar K . V" <aneesh.kumar@...ux.ibm.com>,
"Oliver O'Halloran" <oohall@...il.com>,
Benjamin Herrenschmidt <benh@...nel.crashing.org>,
Paul Mackerras <paulus@...ba.org>,
Michael Ellerman <mpe@...erman.id.au>,
Frederic Barrat <fbarrat@...ux.ibm.com>,
Arnd Bergmann <arnd@...db.de>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Dan Williams <dan.j.williams@...el.com>,
Vishal Verma <vishal.l.verma@...el.com>,
Dave Jiang <dave.jiang@...el.com>,
Ira Weiny <ira.weiny@...el.com>,
Andrew Morton <akpm@...ux-foundation.org>,
Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
"David S. Miller" <davem@...emloft.net>,
Rob Herring <robh@...nel.org>,
Anton Blanchard <anton@...abs.org>,
Krzysztof Kozlowski <krzk@...nel.org>,
Mahesh Salgaonkar <mahesh@...ux.vnet.ibm.com>,
Madhavan Srinivasan <maddy@...ux.vnet.ibm.com>,
Cédric Le Goater <clg@...d.org>,
Anju T Sudhakar <anju@...ux.vnet.ibm.com>,
Hari Bathini <hbathini@...ux.ibm.com>,
Thomas Gleixner <tglx@...utronix.de>,
Greg Kurz <groug@...d.org>,
Nicholas Piggin <npiggin@...il.com>,
Masahiro Yamada <yamada.masahiro@...ionext.com>,
Alexey Kardashevskiy <aik@...abs.ru>,
linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
linux-nvdimm@...ts.01.org, linux-mm@...ck.org
Subject: Re: [PATCH v3 07/27] ocxl: Add functions to map/unmap LPC memory
On Mon, 2020-02-24 at 17:02 +1100, Andrew Donnellan wrote:
> On 21/2/20 2:27 pm, Alastair D'Silva wrote:
> > 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/core.c | 51
> > +++++++++++++++++++++++++++++++
> > drivers/misc/ocxl/ocxl_internal.h | 3 ++
> > include/misc/ocxl.h | 21 +++++++++++++
> > 3 files changed, 75 insertions(+)
> >
> > diff --git a/drivers/misc/ocxl/core.c b/drivers/misc/ocxl/core.c
> > index 2531c6cf19a0..75ff14e3882a 100644
> > --- a/drivers/misc/ocxl/core.c
> > +++ b/drivers/misc/ocxl/core.c
> > @@ -210,6 +210,56 @@ static void unmap_mmio_areas(struct ocxl_afu
> > *afu)
> > release_fn_bar(afu->fn, afu->config.global_mmio_bar);
> > }
> >
> > +int ocxl_afu_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;
>
> I'd prefer the comparison here to be:
>
> afu->config.lpc_mem_size == 0 &&
> afu->config.special_purpose_mem_size == 0
>
> so a reader doesn't have to think about what this means.
>
Ok
> > +
> > + afu->lpc_base_addr = ocxl_link_lpc_map(afu->fn->link, dev);
> > + if (afu->lpc_base_addr == 0)
> > + return -EINVAL;
> > +
> > + if (afu->config.lpc_mem_size > 0) {
> > + afu->lpc_res.start = afu->lpc_base_addr + afu-
> > >config.lpc_mem_offset;
>
> Maybe not for this series - hmm, I wonder if we should print a
> warning
> somewhere (maybe in read_afu_lpc_memory_info()?) if we see the case
> where (lpc_mem_offset > 0 && lpc_mem_size == 0). Likewise for
> special
> purpose?
>
Sounds reasonable, might as well add it here since there are other LPC
changes.
> > + afu->lpc_res.end = afu->lpc_res.start + afu-
> > >config.lpc_mem_size - 1;
> > + }
> > +
> > + if (afu->config.special_purpose_mem_size > 0) {
> > + 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_GPL(ocxl_afu_map_lpc_mem);
> > +
> > +struct resource *ocxl_afu_lpc_mem(struct ocxl_afu *afu)
> > +{
> > + return &afu->lpc_res;
> > +}
> > +EXPORT_SYMBOL_GPL(ocxl_afu_lpc_mem);
>
> What's the point of this function? A layer of indirection just in
> case
> we need it in future?
>
struct ocxl_afu is opaque outsite the ocxl driver.
> > +
> > +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;
> > +
> > + // only release the link when the the last consumer
> > calls release
> > + ocxl_link_lpc_release(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;
> > @@ -251,6 +301,7 @@ 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/ocxl_internal.h
> > b/drivers/misc/ocxl/ocxl_internal.h
> > index d0c8c4838f42..ce0cac1da416 100644
> > --- a/drivers/misc/ocxl/ocxl_internal.h
> > +++ b/drivers/misc/ocxl/ocxl_internal.h
> > @@ -52,6 +52,9 @@ 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 resource lpc_res;
> > + struct resource special_purpose_res;
> > };
> >
> > enum ocxl_context_status {
> > diff --git a/include/misc/ocxl.h b/include/misc/ocxl.h
> > index 357ef1aadbc0..d8b0b4d46bfb 100644
> > --- a/include/misc/ocxl.h
> > +++ b/include/misc/ocxl.h
> > @@ -203,6 +203,27 @@ int ocxl_irq_set_handler(struct ocxl_context
> > *ctx, int irq_id,
> >
> > // AFU Metadata
> >
> > +/**
> > + * ocxl_afu_map_lpc_mem() - Map the LPC system & special purpose
> > memory for an AFU
> > + * Do not call this during device discovery, as there may me
> > multiple
>
> be
>
> > + * 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
> > + *
> > + * Returns 0 on success, negative on failure
> > + */
> > +int ocxl_afu_map_lpc_mem(struct ocxl_afu *afu);
> > +
> > +/**
> > + * ocxl_afu_lpc_mem() - Get the physical address range of LPC
> > memory for an AFU
> > + * @afu: The AFU associated with the LPC memory
> > + *
> > + * Returns a pointer to the resource struct for the physical
> > address range
> > + */
> > +struct resource *ocxl_afu_lpc_mem(struct ocxl_afu *afu);
> > +
> > /**
> > * ocxl_afu_config() - Get a pointer to the config for an AFU
> > * @afu: a pointer to the AFU to get the config for
> >
--
Alastair D'Silva
Open Source Developer
Linux Technology Centre, IBM Australia
mob: 0423 762 819
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