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From: "Alastair D'Silva" <alastair@d-silva.org>
To: "'Dan Williams'" <dan.j.williams@intel.com>
Cc: "\'Aneesh Kumar K . V\'" <aneesh.kumar@linux.ibm.com>,
	"\'Oliver O\'Halloran\'" <oohall@gmail.com>,
	"\'Benjamin Herrenschmidt\'" <benh@kernel.crashing.org>,
	"\'Paul Mackerras\'" <paulus@samba.org>,
	"\'Michael Ellerman\'" <mpe@ellerman.id.au>,
	"\'Frederic Barrat\'" <fbarrat@linux.ibm.com>,
	"\'Andrew Donnellan\'" <ajd@linux.ibm.com>,
	"\'Arnd Bergmann\'" <arnd@arndb.de>,
	"\'Greg Kroah-Hartman\'" <gregkh@linuxfoundation.org>,
	"\'Vishal Verma\'" <vishal.l.verma@intel.com>,
	"\'Dave Jiang\'" <dave.jiang@intel.com>,
	"\'Ira Weiny\'" <ira.weiny@intel.com>,
	"\'Andrew Morton\'" <akpm@linux-foundation.org>,
	"\'Mauro Carvalho Chehab\'" <mchehab+samsung@kernel.org>,
	"\'David S. Miller\'" <davem@davemloft.net>,
	"\'Rob Herring\'" <robh@kernel.org>,
	"\'Anton Blanchard\'" <anton@ozlabs.org>,
	"\'Krzysztof Kozlowski\'" <krzk@kernel.org>,
	"\'Mahesh Salgaonkar\'" <mahesh@linux.vnet.ibm.com>,
	"\'Madhavan Srinivasan\'" <maddy@linux.vnet.ibm.com>,
	"\'Cédric Le Goater\'" <clg@kaod.org>,
	"\'Anju T Sudhakar\'" <anju@linux.vnet.ibm.com>,
	"\'Hari Bathini\'" <hbathini@linux.ibm.com>,
	"\'Thomas Gleixner\'" <tglx@linutronix.de>,
	"\'Greg Kurz\'" <groug@kaod.org>,
	"\'Nicholas Piggin\'" <npiggin@gmail.com>,
	"\'Masahiro Yamada\'" <yamada.masahiro@socionext.com>,
	"\'Alexey Kardashevskiy\'" <aik@ozlabs.ru>,
	"\'Linux Kernel Mailing List\'" <linux-kernel@vger.kernel.org>,
	'linuxppc-dev' <linuxppc-dev@lists.ozlabs.org>,
	'linux-nvdimm' <linux-nvdimm@lists.01.org>,
	"\'Linux MM\'" <linux-mm@kvack.org>
Subject: RE: [PATCH v4 03/25] powerpc/powernv: Map & release OpenCAPI LPC memory
Date: Thu, 2 Apr 2020 15:36:28 +1100
Message-ID: <2e7701d608a8$473a0140$d5ae03c0$@d-silva.org> (raw)
In-Reply-To: <CAPcyv4iGEHJpZctEm+Do1-kOZBUDeKKcREr=BqcK4kCvLWhAQQ@mail.gmail.com>

> -----Original Message-----
> From: Dan Williams <dan.j.williams@intel.com>
> Sent: Wednesday, 1 April 2020 7:49 PM
> To: Alastair D'Silva <alastair@d-silva.org>
> Cc: Aneesh Kumar K . V <aneesh.kumar@linux.ibm.com>; Oliver O'Halloran
> <oohall@gmail.com>; Benjamin Herrenschmidt
> <benh@kernel.crashing.org>; Paul Mackerras <paulus@samba.org>; Michael
> Ellerman <mpe@ellerman.id.au>; Frederic Barrat <fbarrat@linux.ibm.com>;
> Andrew Donnellan <ajd@linux.ibm.com>; Arnd Bergmann
> <arnd@arndb.de>; Greg Kroah-Hartman <gregkh@linuxfoundation.org>;
> Vishal Verma <vishal.l.verma@intel.com>; Dave Jiang
> <dave.jiang@intel.com>; Ira Weiny <ira.weiny@intel.com>; Andrew Morton
> <akpm@linux-foundation.org>; Mauro Carvalho Chehab
> <mchehab+samsung@kernel.org>; David S. Miller <davem@davemloft.net>;
> Rob Herring <robh@kernel.org>; Anton Blanchard <anton@ozlabs.org>;
> Krzysztof Kozlowski <krzk@kernel.org>; Mahesh Salgaonkar
> <mahesh@linux.vnet.ibm.com>; Madhavan Srinivasan
> <maddy@linux.vnet.ibm.com>; Cédric Le Goater <clg@kaod.org>; Anju T
> Sudhakar <anju@linux.vnet.ibm.com>; Hari Bathini
> <hbathini@linux.ibm.com>; Thomas Gleixner <tglx@linutronix.de>; Greg
> Kurz <groug@kaod.org>; Nicholas Piggin <npiggin@gmail.com>; Masahiro
> Yamada <yamada.masahiro@socionext.com>; Alexey Kardashevskiy
> <aik@ozlabs.ru>; Linux Kernel Mailing List <linux-kernel@vger.kernel.org>;
> linuxppc-dev <linuxppc-dev@lists.ozlabs.org>; linux-nvdimm <linux-
> nvdimm@lists.01.org>; Linux MM <linux-mm@kvack.org>
> 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@d-silva.org>
> 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@d-silva.org>
> > Reviewed-by: Andrew Donnellan <ajd@linux.ibm.com>
> > ---
> >  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
> >
> 
> 
> --
> This email has been checked for viruses by AVG.
> https://www.avg.com



  reply index

Thread overview: 60+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-27  7:11 [PATCH v4 00/25] Add support for OpenCAPI Persistent Memory devices Alastair D'Silva
2020-03-27  7:11 ` [PATCH v4 01/25] powerpc/powernv: Add OPAL calls for LPC memory alloc/release Alastair D'Silva
2020-04-01  8:48   ` Dan Williams
2020-04-01 22:51     ` Alastair D'Silva
2020-03-27  7:11 ` [PATCH v4 02/25] mm/memory_hotplug: Allow check_hotplug_memory_addressable to be called from drivers Alastair D'Silva
2020-04-01  8:48   ` Dan Williams
2020-04-02  4:33     ` Alastair D'Silva
2020-03-27  7:11 ` [PATCH v4 03/25] powerpc/powernv: Map & release OpenCAPI LPC memory Alastair D'Silva
2020-04-01  8:48   ` Dan Williams
2020-04-02  4:36     ` Alastair D'Silva [this message]
2020-04-02 10:41     ` Benjamin Herrenschmidt
2020-04-03  4:27       ` Michael Ellerman
2020-03-27  7:11 ` [PATCH v4 04/25] ocxl: Remove unnecessary externs Alastair D'Silva
2020-04-01  8:48   ` Dan Williams
2020-03-27  7:11 ` [PATCH v4 05/25] ocxl: Address kernel doc errors & warnings Alastair D'Silva
2020-04-01  8:49   ` Dan Williams
2020-03-27  7:11 ` [PATCH v4 06/25] ocxl: Tally up the LPC memory on a link & allow it to be mapped Alastair D'Silva
2020-04-01  8:48   ` Dan Williams
2020-04-02  6:21     ` Andrew Donnellan
2020-03-27  7:11 ` [PATCH v4 07/25] ocxl: Add functions to map/unmap LPC memory Alastair D'Silva
2020-04-01  8:49   ` Dan Williams
2020-04-03  3:50     ` Alastair D'Silva
2020-03-27  7:11 ` [PATCH v4 08/25] ocxl: Emit a log message showing how much LPC memory was detected Alastair D'Silva
2020-04-01  8:49   ` Dan Williams
2020-04-02  1:29     ` Joe Perches
2020-04-03  3:52     ` Alastair D'Silva
2020-03-27  7:11 ` [PATCH v4 09/25] ocxl: Save the device serial number in ocxl_fn Alastair D'Silva
2020-03-27  7:11 ` [PATCH v4 10/25] nvdimm: Add driver for OpenCAPI Persistent Memory Alastair D'Silva
2020-03-29  2:56   ` Matthew Wilcox
2020-03-29  2:59     ` Matthew Wilcox
2020-04-01  8:49   ` Dan Williams
2020-04-01 19:35     ` Dan Williams
2020-03-27  7:11 ` [PATCH v4 11/25] powerpc: Enable the OpenCAPI Persistent Memory driver for powernv_defconfig Alastair D'Silva
2020-04-01 20:26   ` Dan Williams
2020-03-27  7:11 ` [PATCH v4 12/25] nvdimm/ocxl: Add register addresses & status values to the header Alastair D'Silva
2020-04-01 20:27   ` Dan Williams
2020-03-27  7:11 ` [PATCH v4 13/25] nvdimm/ocxl: Read the capability registers & wait for device ready Alastair D'Silva
2020-04-02  0:20   ` Dan Williams
2020-03-27  7:11 ` [PATCH v4 14/25] nvdimm/ocxl: Add support for Admin commands Alastair D'Silva
2020-04-02  6:41   ` Dan Williams
2020-03-27  7:11 ` [PATCH v4 15/25] nvdimm/ocxl: Register a character device for userspace to interact with Alastair D'Silva
2020-04-02  0:27   ` Dan Williams
2020-03-27  7:11 ` [PATCH v4 16/25] nvdimm/ocxl: Implement the Read Error Log command Alastair D'Silva
2020-04-03  0:54   ` Dan Williams
2020-03-27  7:11 ` [PATCH v4 17/25] nvdimm/ocxl: Add controller dump IOCTLs Alastair D'Silva
2020-03-27  7:11 ` [PATCH v4 18/25] nvdimm/ocxl: Add an IOCTL to report controller statistics Alastair D'Silva
2020-03-27  7:11 ` [PATCH v4 19/25] nvdimm/ocxl: Forward events to userspace Alastair D'Silva
2020-04-02  2:08   ` Dan Williams
2020-03-27  7:11 ` [PATCH v4 20/25] nvdimm/ocxl: Add an IOCTL to request controller health & perf data Alastair D'Silva
2020-03-27  7:11 ` [PATCH v4 21/25] nvdimm/ocxl: Implement the heartbeat command Alastair D'Silva
2020-03-27  7:11 ` [PATCH v4 22/25] nvdimm/ocxl: Add debug IOCTLs Alastair D'Silva
2020-03-27  7:12 ` [PATCH v4 23/25] nvdimm/ocxl: Expose SMART data via ndctl Alastair D'Silva
2020-03-27  7:12 ` [PATCH v4 24/25] nvdimm/ocxl: Expose the serial number & firmware version in sysfs Alastair D'Silva
2020-03-27  7:12 ` [PATCH v4 25/25] MAINTAINERS: Add myself & nvdimm/ocxl to ocxl Alastair D'Silva
2020-04-01  8:47 ` [PATCH v4 00/25] Add support for OpenCAPI Persistent Memory devices Dan Williams
2020-04-01 22:44   ` Alastair D'Silva
2020-04-02  3:42     ` Michael Ellerman
2020-04-02  3:50       ` Oliver O'Halloran
2020-04-02 10:06         ` Michael Ellerman
2020-04-02 11:10           ` Greg Kurz

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