nvdimm.lists.linux.dev archive mirror
 help / color / mirror / Atom feed
From: Dan Williams <dan.j.williams@intel.com>
To: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Cc: linux-cxl@vger.kernel.org, Ben Widawsky <ben.widawsky@intel.com>,
	 Vishal L Verma <vishal.l.verma@intel.com>,
	"Schofield, Alison" <alison.schofield@intel.com>,
	 Linux NVDIMM <nvdimm@lists.linux.dev>,
	"Weiny, Ira" <ira.weiny@intel.com>
Subject: Re: [PATCH v3 21/28] cxl/pmem: Translate NVDIMM label commands to CXL label commands
Date: Fri, 3 Sep 2021 14:09:48 -0700	[thread overview]
Message-ID: <CAPcyv4hq0BgeZc==w+ypC=RJscccf1JQB2Ynb0LkRYE1qr-gCg@mail.gmail.com> (raw)
In-Reply-To: <20210902192227.00006dc8@Huawei.com>

On Thu, Sep 2, 2021 at 11:22 AM Jonathan Cameron
<Jonathan.Cameron@huawei.com> wrote:
>
> On Tue, 24 Aug 2021 09:07:18 -0700
> Dan Williams <dan.j.williams@intel.com> wrote:
>
> > The LIBNVDIMM IOCTL UAPI calls back to the nvdimm-bus-provider to
> > translate the Linux command payload to the device native command format.
> > The LIBNVDIMM commands get-config-size, get-config-data, and
> > set-config-data, map to the CXL memory device commands device-identify,
> > get-lsa, and set-lsa. Recall that the label-storage-area (LSA) on an
> > NVDIMM device arranges for the provisioning of namespaces. Additionally
> > for CXL the LSA is used for provisioning regions as well.
> >
> > The data from device-identify is already cached in the 'struct cxl_mem'
> > instance associated with @cxl_nvd, so that payload return is simply
> > crafted and no CXL command is issued. The conversion for get-lsa is
> > straightforward, but the conversion for set-lsa requires an allocation
> > to append the set-lsa header in front of the payload.
> >
> > Acked-by: Ben Widawsky <ben.widawsky@intel.com>
> > Signed-off-by: Dan Williams <dan.j.williams@intel.com>
> Minor query inline.
>
[..]
> > +static int cxl_pmem_set_config_data(struct cxl_mem *cxlm,
> > +                                 struct nd_cmd_set_config_hdr *cmd,
> > +                                 unsigned int buf_len, int *cmd_rc)
> > +{
> > +     struct cxl_mbox_set_lsa {
> > +             u32 offset;
> > +             u32 reserved;
> > +             u8 data[];
> > +     } *set_lsa;
> > +     int rc;
> > +
> > +     if (sizeof(*cmd) > buf_len)
> > +             return -EINVAL;
> > +
> > +     /* 4-byte status follows the input data in the payload */
> > +     if (struct_size(cmd, in_buf, cmd->in_length) + 4 > buf_len)
> > +             return -EINVAL;
> > +
> > +     set_lsa =
> > +             kvzalloc(struct_size(set_lsa, data, cmd->in_length), GFP_KERNEL);
> > +     if (!set_lsa)
> > +             return -ENOMEM;
> > +
> > +     *set_lsa = (struct cxl_mbox_set_lsa) {
> > +             .offset = cmd->in_offset,
> > +     };
> > +     memcpy(set_lsa->data, cmd->in_buf, cmd->in_length);
> > +
> > +     rc = cxl_mem_mbox_send_cmd(cxlm, CXL_MBOX_OP_SET_LSA, set_lsa,
> > +                                struct_size(set_lsa, data, cmd->in_length),
> > +                                NULL, 0);
> > +
> > +     /* set "firmware" status */
> > +     *(u32 *) &cmd->in_buf[cmd->in_length] = 0;
>
> Are we guaranteed this is aligned? Not 'locally' obvious so maybe a comment?

Good point, let's just go ahead and use a put_unaligned() accessor.

  reply	other threads:[~2021-09-03 21:09 UTC|newest]

Thread overview: 64+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-24 16:05 [PATCH v3 00/28] cxl_test: Enable CXL Topology and UAPI regression tests Dan Williams
2021-08-24 16:05 ` [PATCH v3 01/28] libnvdimm/labels: Introduce getters for namespace label fields Dan Williams
2021-08-24 16:05 ` [PATCH v3 02/28] libnvdimm/labels: Add isetcookie validation helper Dan Williams
2021-08-24 16:05 ` [PATCH v3 03/28] libnvdimm/labels: Introduce label setter helpers Dan Williams
2021-08-24 16:05 ` [PATCH v3 04/28] libnvdimm/labels: Add a checksum calculation helper Dan Williams
2021-08-24 16:05 ` [PATCH v3 05/28] libnvdimm/labels: Add blk isetcookie set / validation helpers Dan Williams
2021-08-24 16:05 ` [PATCH v3 06/28] libnvdimm/labels: Add blk special cases for nlabel and position helpers Dan Williams
2021-08-24 16:06 ` [PATCH v3 07/28] libnvdimm/labels: Add type-guid helpers Dan Williams
2021-08-24 16:06 ` [PATCH v3 08/28] libnvdimm/labels: Add claim class helpers Dan Williams
2021-08-24 16:06 ` [PATCH v3 09/28] libnvdimm/labels: Add address-abstraction uuid definitions Dan Williams
2021-08-24 16:06 ` [PATCH v3 10/28] libnvdimm/labels: Add uuid helpers Dan Williams
2021-08-24 16:06 ` [PATCH v3 11/28] libnvdimm/label: Add a helper for nlabel validation Dan Williams
2021-09-02 16:37   ` Jonathan Cameron
2021-08-24 16:06 ` [PATCH v3 12/28] libnvdimm/labels: Introduce the concept of multi-range namespace labels Dan Williams
2021-09-02 16:43   ` Jonathan Cameron
2021-08-24 16:06 ` [PATCH v3 13/28] libnvdimm/label: Define CXL region labels Dan Williams
2021-09-02 16:36   ` Jonathan Cameron
2021-09-02 16:41     ` Jonathan Cameron
2021-09-03  3:58       ` Dan Williams
2021-08-24 16:06 ` [PATCH v3 14/28] libnvdimm/labels: Introduce CXL labels Dan Williams
2021-09-03 17:00   ` Dan Williams
2021-08-24 16:06 ` [PATCH v3 15/28] cxl/pci: Make 'struct cxl_mem' device type generic Dan Williams
2021-09-02 16:55   ` Jonathan Cameron
2021-09-02 17:34     ` Dan Williams
2021-08-24 16:06 ` [PATCH v3 16/28] cxl/mbox: Introduce the mbox_send operation Dan Williams
2021-09-02 17:07   ` Jonathan Cameron
2021-08-24 16:06 ` [PATCH v3 17/28] cxl/mbox: Move mailbox and other non-PCI specific infrastructure to the core Dan Williams
2021-09-02 17:56   ` Jonathan Cameron
2021-09-02 18:56     ` Dan Williams
2021-08-24 16:07 ` [PATCH v3 18/28] cxl/pci: Use module_pci_driver Dan Williams
2021-09-02 17:58   ` Jonathan Cameron
2021-08-24 16:07 ` [PATCH v3 19/28] cxl/mbox: Convert 'enabled_cmds' to DECLARE_BITMAP Dan Williams
2021-09-02 17:59   ` Jonathan Cameron
2021-08-24 16:07 ` [PATCH v3 20/28] cxl/mbox: Add exclusive kernel command support Dan Williams
2021-09-02 18:09   ` Jonathan Cameron
2021-09-03 20:47     ` Dan Williams
2021-08-24 16:07 ` [PATCH v3 21/28] cxl/pmem: Translate NVDIMM label commands to CXL label commands Dan Williams
2021-09-02 18:22   ` Jonathan Cameron
2021-09-03 21:09     ` Dan Williams [this message]
2021-08-24 16:07 ` [PATCH v3 22/28] cxl/pmem: Add support for multiple nvdimm-bridge objects Dan Williams
2021-09-03 11:15   ` Jonathan Cameron
2021-08-24 16:07 ` [PATCH v3 23/28] cxl/acpi: Do not add DSDT disabled ACPI0016 host bridge ports Dan Williams
2021-09-02 18:30   ` Jonathan Cameron
2021-09-03 17:51     ` Dan Williams
2021-08-24 16:07 ` [PATCH v3 24/28] tools/testing/cxl: Introduce a mocked-up CXL port hierarchy Dan Williams
2021-09-03 12:52   ` Jonathan Cameron
2021-09-03 21:49     ` Dan Williams
2021-09-06  8:32       ` Jonathan Cameron
2021-09-07 15:57         ` Dan Williams
2021-08-24 16:07 ` [PATCH v3 25/28] cxl/bus: Populate the target list at decoder create Dan Williams
2021-09-03 12:59   ` Jonathan Cameron
2021-09-03 22:43     ` Dan Williams
2021-09-06  8:52       ` Jonathan Cameron
2021-08-24 16:07 ` [PATCH v3 26/28] cxl/mbox: Move command definitions to common location Dan Williams
2021-09-03 13:04   ` Jonathan Cameron
2021-08-24 16:07 ` [PATCH v3 27/28] tools/testing/cxl: Introduce a mock memory device + driver Dan Williams
2021-09-03 13:21   ` Jonathan Cameron
2021-09-03 23:33     ` Dan Williams
2021-09-06  8:57       ` Jonathan Cameron
2021-08-24 16:07 ` [PATCH v3 28/28] cxl/core: Split decoder setup into alloc + add Dan Williams
2021-09-03 13:33   ` Jonathan Cameron
2021-09-03 16:26     ` Dan Williams
2021-09-03 18:01       ` Jonathan Cameron
2021-09-04  0:27         ` Dan Williams

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to='CAPcyv4hq0BgeZc==w+ypC=RJscccf1JQB2Ynb0LkRYE1qr-gCg@mail.gmail.com' \
    --to=dan.j.williams@intel.com \
    --cc=Jonathan.Cameron@huawei.com \
    --cc=alison.schofield@intel.com \
    --cc=ben.widawsky@intel.com \
    --cc=ira.weiny@intel.com \
    --cc=linux-cxl@vger.kernel.org \
    --cc=nvdimm@lists.linux.dev \
    --cc=vishal.l.verma@intel.com \
    --subject='Re: [PATCH v3 21/28] cxl/pmem: Translate NVDIMM label commands to CXL label commands' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).