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Date: Mon, 8 Feb 2016 15:23:46 -0500
From: Linda Knippers <linda.knippers@....com>
To: Dan Williams <dan.j.williams@...el.com>, linux-nvdimm@...ts.01.org
Cc: linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
stable@...r.kernel.org
Subject: Re: [PATCH 1/3] nfit: fix multi-interface dimm handling, acpi6.1
compatibility
On 2/8/2016 2:10 PM, Linda Knippers wrote:
> On 2/8/2016 1:30 PM, Dan Williams wrote:
>> ACPI 6.1 clarified that multi-interface dimms require multiple control
>> region entries (DCRs) per dimm. Previously we were assuming that a
>> control region is only present when block-data-windows are present.
>
> We need to give this a quick test with NVDIMM-N because those types of
> NVDIMMs have control regions without block-data-windows. We've fixed
> bugs related to that assumption a couple of times.
I can't test the conditions for which these changes were made but the
code continues to work on my NVDIMM-N system where we have control
regions w/o block-data windows.
-- ljk
>
>> This implementation was done with an eye to be compatibility with the
>> looser ACPI 6.0 interpretation of this table.
>>
>> 1/ When coalescing the memory device (MEMDEV) tables for a single dimm,
>> coalesce on device_handle rather than control region index.
>>
>> 2/ Whenever we disocver a control region with non-zero block windows
> discover
>
>> re-scan for block-data-window (BDW) entries.
>>
>> We may need to revisit this if a DIMM ever implements a format interface
>> outside of blk or pmem, but that is not on the foreseeable horizon.
>>
>> Cc: <stable@...r.kernel.org>
>> Signed-off-by: Dan Williams <dan.j.williams@...el.com>
>> ---
>> drivers/acpi/nfit.c | 71 +++++++++++++++++++++++++--------------------------
>> 1 file changed, 35 insertions(+), 36 deletions(-)
>>
>> diff --git a/drivers/acpi/nfit.c b/drivers/acpi/nfit.c
>> index ad6d8c6b777e..424b362e8fdc 100644
>> --- a/drivers/acpi/nfit.c
>> +++ b/drivers/acpi/nfit.c
>> @@ -469,37 +469,16 @@ static void nfit_mem_find_spa_bdw(struct acpi_nfit_desc *acpi_desc,
>> nfit_mem->bdw = NULL;
>> }
>>
>> -static int nfit_mem_add(struct acpi_nfit_desc *acpi_desc,
>> +static void nfit_mem_init_bdw(struct acpi_nfit_desc *acpi_desc,
>> struct nfit_mem *nfit_mem, struct acpi_nfit_system_address *spa)
>> {
>> u16 dcr = __to_nfit_memdev(nfit_mem)->region_index;
>> struct nfit_memdev *nfit_memdev;
>> struct nfit_flush *nfit_flush;
>> - struct nfit_dcr *nfit_dcr;
>> struct nfit_bdw *nfit_bdw;
>> struct nfit_idt *nfit_idt;
>> u16 idt_idx, range_index;
>>
>> - list_for_each_entry(nfit_dcr, &acpi_desc->dcrs, list) {
>> - if (nfit_dcr->dcr->region_index != dcr)
>> - continue;
>> - nfit_mem->dcr = nfit_dcr->dcr;
>> - break;
>> - }
>> -
>> - if (!nfit_mem->dcr) {
>> - dev_dbg(acpi_desc->dev, "SPA %d missing:%s%s\n",
>> - spa->range_index, __to_nfit_memdev(nfit_mem)
>> - ? "" : " MEMDEV", nfit_mem->dcr ? "" : " DCR");
>> - return -ENODEV;
>> - }
>> -
>> - /*
>> - * We've found enough to create an nvdimm, optionally
>> - * find an associated BDW
>> - */
>> - list_add(&nfit_mem->list, &acpi_desc->dimms);
>> -
>> list_for_each_entry(nfit_bdw, &acpi_desc->bdws, list) {
>> if (nfit_bdw->bdw->region_index != dcr)
>> continue;
>> @@ -508,12 +487,12 @@ static int nfit_mem_add(struct acpi_nfit_desc *acpi_desc,
>> }
>>
>> if (!nfit_mem->bdw)
>> - return 0;
>> + return;
>>
>> nfit_mem_find_spa_bdw(acpi_desc, nfit_mem);
>>
>> if (!nfit_mem->spa_bdw)
>> - return 0;
>> + return;
>>
>> range_index = nfit_mem->spa_bdw->range_index;
>> list_for_each_entry(nfit_memdev, &acpi_desc->memdevs, list) {
>> @@ -538,8 +517,6 @@ static int nfit_mem_add(struct acpi_nfit_desc *acpi_desc,
>> }
>> break;
>> }
>> -
>> - return 0;
>> }
>>
>> static int nfit_mem_dcr_init(struct acpi_nfit_desc *acpi_desc,
>> @@ -548,7 +525,6 @@ static int nfit_mem_dcr_init(struct acpi_nfit_desc *acpi_desc,
>> struct nfit_mem *nfit_mem, *found;
>> struct nfit_memdev *nfit_memdev;
>> int type = nfit_spa_type(spa);
>> - u16 dcr;
>>
>> switch (type) {
>> case NFIT_SPA_DCR:
>> @@ -559,14 +535,18 @@ static int nfit_mem_dcr_init(struct acpi_nfit_desc *acpi_desc,
>> }
>>
>> list_for_each_entry(nfit_memdev, &acpi_desc->memdevs, list) {
>> - int rc;
>> + struct nfit_dcr *nfit_dcr;
>> + u32 device_handle;
>> + u16 dcr;
>>
>> if (nfit_memdev->memdev->range_index != spa->range_index)
>> continue;
>> found = NULL;
>> dcr = nfit_memdev->memdev->region_index;
>> + device_handle = nfit_memdev->memdev->device_handle;
>> list_for_each_entry(nfit_mem, &acpi_desc->dimms, list)
>> - if (__to_nfit_memdev(nfit_mem)->region_index == dcr) {
>> + if (__to_nfit_memdev(nfit_mem)->device_handle
>> + == device_handle) {
>> found = nfit_mem;
>> break;
>> }
>> @@ -579,6 +559,31 @@ static int nfit_mem_dcr_init(struct acpi_nfit_desc *acpi_desc,
>> if (!nfit_mem)
>> return -ENOMEM;
>> INIT_LIST_HEAD(&nfit_mem->list);
>> + list_add(&nfit_mem->list, &acpi_desc->dimms);
>> + }
>> +
>> + list_for_each_entry(nfit_dcr, &acpi_desc->dcrs, list) {
>> + if (nfit_dcr->dcr->region_index != dcr)
>> + continue;
>> + /*
>> + * Record the control region for the dimm. For
>> + * the ACPI 6.1 case, where there are separate
>> + * control regions for the pmem vs blk
>> + * interfaces, be sure to record the extended
>> + * blk details.
>> + */
>> + if (!nfit_mem->dcr)
>> + nfit_mem->dcr = nfit_dcr->dcr;
>> + else if (nfit_mem->dcr->windows == 0
>> + && nfit_dcr->dcr->windows)
>> + nfit_mem->dcr = nfit_dcr->dcr;
>> + break;
>> + }
>> +
>> + if (dcr && !nfit_mem->dcr) {
>> + dev_err(acpi_desc->dev, "SPA %d missing DCR %d\n",
>> + spa->range_index, dcr);
>> + return -ENODEV;
>> }
>>
>> if (type == NFIT_SPA_DCR) {
>> @@ -595,6 +600,7 @@ static int nfit_mem_dcr_init(struct acpi_nfit_desc *acpi_desc,
>> nfit_mem->idt_dcr = nfit_idt->idt;
>> break;
>> }
>> + nfit_mem_init_bdw(acpi_desc, nfit_mem, spa);
>> } else {
>> /*
>> * A single dimm may belong to multiple SPA-PM
>> @@ -603,13 +609,6 @@ static int nfit_mem_dcr_init(struct acpi_nfit_desc *acpi_desc,
>> */
>> nfit_mem->memdev_pmem = nfit_memdev->memdev;
>> }
>> -
>> - if (found)
>> - continue;
>> -
>> - rc = nfit_mem_add(acpi_desc, nfit_mem, spa);
>> - if (rc)
>> - return rc;
>> }
>>
>> return 0;
>>
>> _______________________________________________
>> Linux-nvdimm mailing list
>> Linux-nvdimm@...ts.01.org
>> https://lists.01.org/mailman/listinfo/linux-nvdimm
>>
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