> -----Original Message-----
> From: Dan Williams <dan.j.williams@xxxxxxxxx>
> Sent: Wednesday, 1 April 2020 7:49 PM
> To: Alastair D'Silva <alastair@xxxxxxxxxxx>
> Cc: Aneesh Kumar K . V <aneesh.kumar@xxxxxxxxxxxxx>; Oliver O'Halloran
> <oohall@xxxxxxxxx>; Benjamin Herrenschmidt
> <benh@xxxxxxxxxxxxxxxxxxx>; Paul Mackerras <paulus@xxxxxxxxx>; Michael
> Ellerman <mpe@xxxxxxxxxxxxxx>; Frederic Barrat <fbarrat@xxxxxxxxxxxxx>;
> Andrew Donnellan <ajd@xxxxxxxxxxxxx>; Arnd Bergmann
> <arnd@xxxxxxxx>; Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>;
> Vishal Verma <vishal.l.verma@xxxxxxxxx>; Dave Jiang
> <dave.jiang@xxxxxxxxx>; Ira Weiny <ira.weiny@xxxxxxxxx>; Andrew Morton
> <akpm@xxxxxxxxxxxxxxxxxxxx>; Mauro Carvalho Chehab
> <mchehab+samsung@xxxxxxxxxx>; David S. Miller <davem@xxxxxxxxxxxxx>;
> Rob Herring <robh@xxxxxxxxxx>; Anton Blanchard <anton@xxxxxxxxxx>;
> Krzysztof Kozlowski <krzk@xxxxxxxxxx>; Mahesh Salgaonkar
> <mahesh@xxxxxxxxxxxxxxxxxx>; Madhavan Srinivasan
> <maddy@xxxxxxxxxxxxxxxxxx>; Cédric Le Goater <clg@xxxxxxxx>; Anju T
> Sudhakar <anju@xxxxxxxxxxxxxxxxxx>; Hari Bathini
> <hbathini@xxxxxxxxxxxxx>; Thomas Gleixner <tglx@xxxxxxxxxxxxx>; Greg
> Kurz <groug@xxxxxxxx>; Nicholas Piggin <npiggin@xxxxxxxxx>; Masahiro
> Yamada <yamada.masahiro@xxxxxxxxxxxxx>; Alexey Kardashevskiy
> <aik@xxxxxxxxx>; Linux Kernel Mailing List <linux-kernel@xxxxxxxxxxxxxxx>;
> linuxppc-dev <linuxppc-dev@xxxxxxxxxxxxxxxx>; linux-nvdimm <linux-
> nvdimm@xxxxxxxxxxxx>; Linux MM <linux-mm@xxxxxxxxx>
> Subject: Re: [PATCH v4 03/25] powerpc/powernv: Map & release OpenCAPI
> LPC memory
>
> On Sun, Mar 29, 2020 at 10:23 PM Alastair D'Silva <alastair@xxxxxxxxxxx>
> wrote:
> >
> > This patch adds OPAL calls to powernv so that the OpenCAPI driver can
> > map & release LPC (Lowest Point of Coherency) memory.
> >
> > Signed-off-by: Alastair D'Silva <alastair@xxxxxxxxxxx>
> > Reviewed-by: Andrew Donnellan <ajd@xxxxxxxxxxxxx>
> > ---
> > arch/powerpc/include/asm/pnv-ocxl.h | 2 ++
> > arch/powerpc/platforms/powernv/ocxl.c | 43
> > +++++++++++++++++++++++++++
> > 2 files changed, 45 insertions(+)
> >
> > diff --git a/arch/powerpc/include/asm/pnv-ocxl.h
> > b/arch/powerpc/include/asm/pnv-ocxl.h
> > index 7de82647e761..560a19bb71b7 100644
> > --- a/arch/powerpc/include/asm/pnv-ocxl.h
> > +++ b/arch/powerpc/include/asm/pnv-ocxl.h
> > @@ -32,5 +32,7 @@ extern int
> pnv_ocxl_spa_remove_pe_from_cache(void
> > *platform_data, int pe_handle)
> >
> > extern int pnv_ocxl_alloc_xive_irq(u32 *irq, u64 *trigger_addr);
> > extern void pnv_ocxl_free_xive_irq(u32 irq);
> > +u64 pnv_ocxl_platform_lpc_setup(struct pci_dev *pdev, u64 size); void
> > +pnv_ocxl_platform_lpc_release(struct pci_dev *pdev);
> >
> > #endif /* _ASM_PNV_OCXL_H */
> > diff --git a/arch/powerpc/platforms/powernv/ocxl.c
> > b/arch/powerpc/platforms/powernv/ocxl.c
> > index 8c65aacda9c8..f13119a7c026 100644
> > --- a/arch/powerpc/platforms/powernv/ocxl.c
> > +++ b/arch/powerpc/platforms/powernv/ocxl.c
> > @@ -475,6 +475,49 @@ void pnv_ocxl_spa_release(void *platform_data)
> }
> > EXPORT_SYMBOL_GPL(pnv_ocxl_spa_release);
> >
> > +u64 pnv_ocxl_platform_lpc_setup(struct pci_dev *pdev, u64 size) {
> > + struct pci_controller *hose = pci_bus_to_host(pdev->bus);
> > + struct pnv_phb *phb = hose->private_data;
>
> Is calling the local variable 'hose' instead of 'host' on purpose?
>
Yes, this follows the convention used in other functions in this file.
> > + u32 bdfn = pci_dev_id(pdev);
> > + __be64 base_addr_be64;
> > + u64 base_addr;
> > + int rc;
> > +
> > + rc = opal_npu_mem_alloc(phb->opal_id, bdfn, size,
> &base_addr_be64);
> > + if (rc) {
> > + dev_warn(&pdev->dev,
> > + "OPAL could not allocate LPC memory, rc=%d\n", rc);
> > + return 0;
> > + }
> > +
> > + base_addr = be64_to_cpu(base_addr_be64);
> > +
> > +#ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
>
> With the proposed cleanup in patch2 the ifdef can be elided here.
Ok
>
> > + rc = check_hotplug_memory_addressable(base_addr >> PAGE_SHIFT,
> > + size >> PAGE_SHIFT);
> > + if (rc)
> > + return 0;
>
> Is this an error worth logging if someone is wondering why their device is not
> showing up?
>
Yes, I'll add a message.
>
> > +#endif
> > +
> > + return base_addr;
> > +}
> > +EXPORT_SYMBOL_GPL(pnv_ocxl_platform_lpc_setup);
> > +
> > +void pnv_ocxl_platform_lpc_release(struct pci_dev *pdev) {
> > + struct pci_controller *hose = pci_bus_to_host(pdev->bus);
> > + struct pnv_phb *phb = hose->private_data;
> > + u32 bdfn = pci_dev_id(pdev);
> > + int rc;
> > +
> > + rc = opal_npu_mem_release(phb->opal_id, bdfn);
> > + if (rc)
> > + dev_warn(&pdev->dev,
> > + "OPAL reported rc=%d when releasing LPC
> > +memory\n", rc); }
> EXPORT_SYMBOL_GPL(pnv_ocxl_platform_lpc_release);
> > +
> > int pnv_ocxl_spa_remove_pe_from_cache(void *platform_data, int
> > pe_handle) {
> > struct spa_data *data = (struct spa_data *) platform_data;
> > --
> > 2.24.1
> >
>
>
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