linux-kernel - Re: [PATCH v3 2/3] cxl/edac: Fix wrong dpa checking for PPR operation

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Message-ID: <86bcfb22-f9e7-4b2a-a51b-d8d63d423fcc@zohomail.com>
Date: Wed, 9 Jul 2025 15:13:09 +0800
From: Li Ming <ming.li@...omail.com>
To: Alison Schofield <alison.schofield@...el.com>
Cc: dave@...olabs.net, jonathan.cameron@...wei.com, dave.jiang@...el.com,
 vishal.l.verma@...el.com, ira.weiny@...el.com, dan.j.williams@...el.com,
 shiju.jose@...wei.com, andriy.shevchenko@...ux.intel.com,
 linux-cxl@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 2/3] cxl/edac: Fix wrong dpa checking for PPR operation

On 7/9/2025 9:42 AM, Alison Schofield wrote:
> On Tue, Jul 08, 2025 at 01:15:35PM +0800, Li Ming wrote:
>> DPA 0 is considered invalid in cxl_do_ppr(), but per Table 8-143. "Get
>> Partition Info Output Payload" in CXL r3.2 section 8.2.10.9.2.1 "Get
>> Partition Info(Opcode 4100h)", it mentions that DPA 0 is a valid address
>> of a CXL device. So the correct implementation should be checking if the
>> DPA is in the DPA range of the CXL device rather than checking if the
>> DPA is equal to 0.
>>
> If it needs a fixes tag, doesn't it also need a user visible impact
> statement? I get that the PPR won't happen. What does that look like
> to the user? Is there a user level error message we can add to the
> commit log?
>
> With that, you can add:
> Reviewed-by: Alison Schofield <alison.schofield@...el.com>
>
Will do. Thanks.


Ming

>
>> Fixes: be9b359e056a ("cxl/edac: Add CXL memory device soft PPR control feature")
>> Signed-off-by: Li Ming <ming.li@...omail.com>
>> Tested-by: Shiju Jose <shiju.jose@...wei.com>
>> Reviewed-by: Shiju Jose <shiju.jose@...wei.com>
>> ---
>>  drivers/cxl/core/edac.c | 5 ++++-
>>  1 file changed, 4 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/cxl/core/edac.c b/drivers/cxl/core/edac.c
>> index 623aaa4439c4..1cf65b1538b9 100644
>> --- a/drivers/cxl/core/edac.c
>> +++ b/drivers/cxl/core/edac.c
>> @@ -1923,8 +1923,11 @@ static int cxl_ppr_set_nibble_mask(struct device *dev, void *drv_data,
>>  static int cxl_do_ppr(struct device *dev, void *drv_data, u32 val)
>>  {
>>  	struct cxl_ppr_context *cxl_ppr_ctx = drv_data;
>> +	struct cxl_memdev *cxlmd = cxl_ppr_ctx->cxlmd;
>> +	struct cxl_dev_state *cxlds = cxlmd->cxlds;
>>  
>> -	if (!cxl_ppr_ctx->dpa || val != EDAC_DO_MEM_REPAIR)
>> +	if (!resource_contains_addr(&cxlds->dpa_res, cxl_ppr_ctx->dpa) ||
>> +	    val != EDAC_DO_MEM_REPAIR)
>>  		return -EINVAL;
>>  
>>  	return cxl_mem_perform_ppr(cxl_ppr_ctx);
>> -- 
>> 2.34.1
>>