Hi Tony,
On Mon, 12 Mar 2018 11:24:30 -0700, Tony Luck wrote:
> This just covers the topology function of the EDAC driver.
> We locate which DIMM slots are populated with NVDIMMs and
> query the NFIT and SMBIOS tables to get the size.
>
> Signed-off-by: Tony Luck <tony.luck@xxxxxxxxx>
> ---
> drivers/edac/Kconfig | 5 +++-
> drivers/edac/skx_edac.c | 66 ++++++++++++++++++++++++++++++++++++++++++++-----
> 2 files changed, 64 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/edac/Kconfig b/drivers/edac/Kconfig
> index 3c4017007647..c12e34564557 100644
> --- a/drivers/edac/Kconfig
> +++ b/drivers/edac/Kconfig
> @@ -232,9 +232,12 @@ config EDAC_SBRIDGE
> config EDAC_SKX
> tristate "Intel Skylake server Integrated MC"
> depends on PCI && X86_64 && X86_MCE_INTEL && PCI_MMCONFIG
> + select DMI
> help
> Support for error detection and correction the Intel
> - Skylake server Integrated Memory Controllers.
> + Skylake server Integrated Memory Controllers. If your
> + system has non-volatile DIMMs you should also manually
> + select CONFIG_ACPI_NFIT
Nitpicking: trailing dot is missing.
>
> config EDAC_PND2
> tristate "Intel Pondicherry2"
> diff --git a/drivers/edac/skx_edac.c b/drivers/edac/skx_edac.c
> index 912c4930c9ef..84c18bb1e0cd 100644
> --- a/drivers/edac/skx_edac.c
> +++ b/drivers/edac/skx_edac.c
> (...)
> +static int get_nvdimm_info(struct dimm_info *dimm, struct skx_imc *imc,
> + int chan, int dimmno)
> +{
> + int smbios_handle;
> + u32 dev_handle;
> + u16 flags;
> + u64 size = 0;
> +
> + dev_handle = ACPI_NFIT_BUILD_DEVICE_HANDLE(dimmno, chan, imc->lmc,
> + imc->src_id, 0);
> +
> + smbios_handle = nfit_get_smbios_id(dev_handle, &flags);
> + if (smbios_handle == -EOPNOTSUPP) {
> + pr_warn_once("skx_edac: can't find size of NVDIMM. Try enabling CONFIG_ACPI_NFIT\n");
> + goto unknown_size;
> + }
> + if (smbios_handle < 0) {
> + skx_printk(KERN_ERR, "Can't find handle for NVDIMM ADR=%x\n", dev_handle);
> + goto unknown_size;
> + }
> +
> + if (flags & ACPI_NFIT_MEM_MAP_FAILED) {
> + skx_printk(KERN_ERR, "NVDIMM ADR=%x is not mapped\n", dev_handle);
> + goto unknown_size;
> + }
> +
> + size = dmi_memdev_size(smbios_handle);
> + if (size == ~0ull)
> + skx_printk(KERN_ERR, "Can't find size for NVDIMM ADR=%x/SMBIOS=%x\n",
> + dev_handle, smbios_handle);
> +
> +unknown_size:
> + dimm->nr_pages = size >> PAGE_SHIFT;
> + dimm->grain = 32;
> + dimm->dtype = DEV_UNKNOWN;
> + dimm->mtype = MEM_NVDIMM;
> + dimm->edac_mode = EDAC_SECDED; /* likely better than this */
> +
> + edac_dbg(0, "mc#%d: channel %d, dimm %d, %llu Mb (%u pages)\n",
I did not notice on previous review, but I think "b" in general means
bit not byte, so "MB" would be better.
> + imc->mc, chan, dimmno, size >> 20, dimm->nr_pages);
> +
> + snprintf(dimm->label, sizeof(dimm->label), "CPU_SrcID#%u_MC#%u_Chan#%u_DIMM#%u",
> + imc->src_id, imc->lmc, chan, dimmno);
> +
> + return 1;
> +}
Now this function always return 1, that doesn't make a lot of sense?
Other than these details, the dmi-related code looks good to me now.
Reviewed-by: Jean Delvare <jdelvare@xxxxxxx> # for DMI
--
Jean Delvare
SUSE L3 Support
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