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Message-Id: <32caa2ef-43b2-f71d-f470-ccfed0ae094e@linux.ibm.com>
Date: Tue, 29 Oct 2019 12:49:11 +1100
From: Andrew Donnellan <ajd@...ux.ibm.com>
To: "Alastair D'Silva" <alastair@....ibm.com>, alastair@...ilva.org
Cc: 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>,
Keith Busch <keith.busch@...el.com>,
Ira Weiny <ira.weiny@...el.com>,
Geert Uytterhoeven <geert+renesas@...der.be>,
Krzysztof Kozlowski <krzk@...nel.org>,
Anton Blanchard <anton@...abs.org>,
Allison Randal <allison@...utok.net>,
Cédric Le Goater <clg@...d.org>,
David Gibson <david@...son.dropbear.id.au>,
Vasant Hegde <hegdevasant@...ux.vnet.ibm.com>,
Thomas Gleixner <tglx@...utronix.de>,
Anju T Sudhakar <anju@...ux.vnet.ibm.com>,
Hari Bathini <hbathini@...ux.ibm.com>,
Mahesh Salgaonkar <mahesh@...ux.vnet.ibm.com>,
Greg Kurz <groug@...d.org>,
Masahiro Yamada <yamada.masahiro@...ionext.com>,
Alexey Kardashevskiy <aik@...abs.ru>,
Andrew Morton <akpm@...ux-foundation.org>,
David Hildenbrand <david@...hat.com>,
Oscar Salvador <osalvador@...e.com>,
Michal Hocko <mhocko@...e.com>,
Pavel Tatashin <pasha.tatashin@...een.com>,
Wei Yang <richard.weiyang@...il.com>, Qian Cai <cai@....pw>,
linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
linux-nvdimm@...ts.01.org, linux-mm@...ck.org
Subject: Re: [PATCH 04/10] powerpc: Map & release OpenCAPI LPC memory
On 25/10/19 3:46 pm, Alastair D'Silva wrote:
> From: Alastair D'Silva <alastair@...ilva.org>
>
> This patch adds platform support to map & release LPC memory.
> > Signed-off-by: Alastair D'Silva <alastair@...ilva.org>
> ---
> arch/powerpc/include/asm/pnv-ocxl.h | 2 ++
> arch/powerpc/platforms/powernv/ocxl.c | 41 +++++++++++++++++++++++++++
> include/linux/memory_hotplug.h | 5 ++++
> mm/memory_hotplug.c | 3 +-
> 4 files changed, 50 insertions(+), 1 deletion(-)
>
> diff --git a/arch/powerpc/include/asm/pnv-ocxl.h b/arch/powerpc/include/asm/pnv-ocxl.h
> index 7de82647e761..f8f8ffb48aa8 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);
> +extern u64 pnv_ocxl_platform_lpc_setup(struct pci_dev *pdev, u64 size);
> +extern 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..c6d4234e0aba 100644
> --- a/arch/powerpc/platforms/powernv/ocxl.c
> +++ b/arch/powerpc/platforms/powernv/ocxl.c
> @@ -475,6 +475,47 @@ 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;
> + u32 bdfn = (pdev->bus->number << 8) | pdev->devfn;
I think pci_dev_id() is the canonical way to do this? (same applies in
release)
> + u64 base_addr = 0;
> + int rc;
> +
> + rc = opal_npu_mem_alloc(phb->opal_id, bdfn, size, &base_addr);
> + 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);
sparse doesn't like this, the way it's usually done is declare a __be64
variable, pass that to the opal call, then store the conversion in a
regular u64
> +
> + rc = check_hotplug_memory_addressable(base_addr >> PAGE_SHIFT,
> + size >> PAGE_SHIFT);
> + if (rc)
> + return 0;
> +
> + 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 = (pdev->bus->number << 8) | pdev->devfn;
> + 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;
> diff --git a/include/linux/memory_hotplug.h b/include/linux/memory_hotplug.h
> index f46ea71b4ffd..3f5f1a642abe 100644
> --- a/include/linux/memory_hotplug.h
> +++ b/include/linux/memory_hotplug.h
> @@ -339,6 +339,11 @@ static inline int remove_memory(int nid, u64 start, u64 size)
> static inline void __remove_memory(int nid, u64 start, u64 size) {}
> #endif /* CONFIG_MEMORY_HOTREMOVE */
>
> +#if CONFIG_MEMORY_HOTPLUG_SPARSE
This needs to be #ifdef.
> +int check_hotplug_memory_addressable(unsigned long pfn,
> + unsigned long nr_pages);
> +#endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */
> +
> extern void __ref free_area_init_core_hotplug(int nid);
> extern int __add_memory(int nid, u64 start, u64 size);
> extern int add_memory(int nid, u64 start, u64 size);
> diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
> index 2cecf07b396f..b39827dbd071 100644
> --- a/mm/memory_hotplug.c
> +++ b/mm/memory_hotplug.c
> @@ -278,7 +278,7 @@ static int check_pfn_span(unsigned long pfn, unsigned long nr_pages,
> return 0;
> }
>
> -static int check_hotplug_memory_addressable(unsigned long pfn,
> +int check_hotplug_memory_addressable(unsigned long pfn,
> unsigned long nr_pages)
> {
> const u64 max_addr = PFN_PHYS(pfn + nr_pages) - 1;
> @@ -294,6 +294,7 @@ static int check_hotplug_memory_addressable(unsigned long pfn,
>
> return 0;
> }
> +EXPORT_SYMBOL_GPL(check_hotplug_memory_addressable);
This export seems unnecessary, you don't seem to be using this function
in a module anywhere in this series AFAICT.
Also it looks like a whitespace fix from removing the static ended up in
patch #8 rather than here.
>
> /*
> * Reasonably generic function for adding memory. It is
>
--
Andrew Donnellan OzLabs, ADL Canberra
ajd@...ux.ibm.com IBM Australia Limited
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