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Message-ID: <fb81e416-6c12-490f-b600-dd05a7d9a727@intel.com>
Date: Thu, 11 Sep 2025 12:41:03 -0700
From: Dave Jiang <dave.jiang@...el.com>
To: "Bowman, Terry" <terry.bowman@....com>,
Jonathan Cameron <jonathan.cameron@...wei.com>
Cc: dave@...olabs.net, alison.schofield@...el.com, dan.j.williams@...el.com,
bhelgaas@...gle.com, shiju.jose@...wei.com, ming.li@...omail.com,
Smita.KoralahalliChannabasappa@....com, rrichter@....com,
dan.carpenter@...aro.org, PradeepVineshReddy.Kodamati@....com,
lukas@...ner.de, Benjamin.Cheatham@....com,
sathyanarayanan.kuppuswamy@...ux.intel.com, linux-cxl@...r.kernel.org,
alucerop@....com, ira.weiny@...el.com, linux-kernel@...r.kernel.org,
linux-pci@...r.kernel.org
Subject: Re: [PATCH v11 05/23] cxl: Move CXL driver RCH error handling into
CONFIG_CXL_RCH_RAS conditional block
On 9/11/25 10:48 AM, Bowman, Terry wrote:
>
>
> On 8/29/2025 10:33 AM, Jonathan Cameron wrote:
>> On Tue, 26 Aug 2025 20:35:20 -0500
>> Terry Bowman <terry.bowman@....com> wrote:
>>
>>> Restricted CXL Host (RCH) protocol error handling uses a procedure distinct
>>> from the CXL Virtual Hierarchy (VH) handling. This is because of the
>>> differences in the RCH and VH topologies. Improve the maintainability and
>>> add ability to enable/disable RCH handling.
>>>
>>> Move and combine the RCH handling code into a single block conditionally
>>> compiled with the CONFIG_CXL_RCH_RAS kernel config.
>>>
>>> Signed-off-by: Terry Bowman <terry.bowman@....com>
>>>
>> How painful to move this to a ras_rch.c file and conditionally compile that?
>>
>> Would want to do that is some merged thing with patch 1 though, rather than
>> moving at least some of the code twice.
>>
>
> I don't see an issue and the effort would be a simple rework of patch1 as you
> mentioned. But, it would drop the 'reviewed-by' sign-offs. Should we check with
> others about this too?
I would go ahead and do it.
>
> Terry
>
>>
>>> ---
>>> v10->v11:
>>> - New patch
>>> ---
>>> drivers/cxl/core/ras.c | 175 +++++++++++++++++++++--------------------
>>> 1 file changed, 90 insertions(+), 85 deletions(-)
>>>
>>> diff --git a/drivers/cxl/core/ras.c b/drivers/cxl/core/ras.c
>>> index 0875ce8116ff..f42f9a255ef8 100644
>>> --- a/drivers/cxl/core/ras.c
>>> +++ b/drivers/cxl/core/ras.c
>>> @@ -126,6 +126,7 @@ void cxl_ras_exit(void)
>>> cancel_work_sync(&cxl_cper_prot_err_work);
>>> }
>>>
>>> +#ifdef CONFIG_CXL_RCH_RAS
>>> static void cxl_dport_map_rch_aer(struct cxl_dport *dport)
>>> {
>>> resource_size_t aer_phys;
>>> @@ -141,18 +142,6 @@ static void cxl_dport_map_rch_aer(struct cxl_dport *dport)
>>> }
>>> }
>>>
>>> -static void cxl_dport_map_ras(struct cxl_dport *dport)
>>> -{
>>> - struct cxl_register_map *map = &dport->reg_map;
>>> - struct device *dev = dport->dport_dev;
>>> -
>>> - if (!map->component_map.ras.valid)
>>> - dev_dbg(dev, "RAS registers not found\n");
>>> - else if (cxl_map_component_regs(map, &dport->regs.component,
>>> - BIT(CXL_CM_CAP_CAP_ID_RAS)))
>>> - dev_dbg(dev, "Failed to map RAS capability.\n");
>>> -}
>>> -
>>> static void cxl_disable_rch_root_ints(struct cxl_dport *dport)
>>> {
>>> void __iomem *aer_base = dport->regs.dport_aer;
>>> @@ -177,6 +166,95 @@ static void cxl_disable_rch_root_ints(struct cxl_dport *dport)
>>> writel(aer_cmd, aer_base + PCI_ERR_ROOT_COMMAND);
>>> }
>>>
>>> +/*
>>> + * Copy the AER capability registers using 32 bit read accesses.
>>> + * This is necessary because RCRB AER capability is MMIO mapped. Clear the
>>> + * status after copying.
>>> + *
>>> + * @aer_base: base address of AER capability block in RCRB
>>> + * @aer_regs: destination for copying AER capability
>>> + */
>>> +static bool cxl_rch_get_aer_info(void __iomem *aer_base,
>>> + struct aer_capability_regs *aer_regs)
>>> +{
>>> + int read_cnt = sizeof(struct aer_capability_regs) / sizeof(u32);
>>> + u32 *aer_regs_buf = (u32 *)aer_regs;
>>> + int n;
>>> +
>>> + if (!aer_base)
>>> + return false;
>>> +
>>> + /* Use readl() to guarantee 32-bit accesses */
>>> + for (n = 0; n < read_cnt; n++)
>>> + aer_regs_buf[n] = readl(aer_base + n * sizeof(u32));
>>> +
>>> + writel(aer_regs->uncor_status, aer_base + PCI_ERR_UNCOR_STATUS);
>>> + writel(aer_regs->cor_status, aer_base + PCI_ERR_COR_STATUS);
>>> +
>>> + return true;
>>> +}
>>> +
>>> +/* Get AER severity. Return false if there is no error. */
>>> +static bool cxl_rch_get_aer_severity(struct aer_capability_regs *aer_regs,
>>> + int *severity)
>>> +{
>>> + if (aer_regs->uncor_status & ~aer_regs->uncor_mask) {
>>> + if (aer_regs->uncor_status & PCI_ERR_ROOT_FATAL_RCV)
>>> + *severity = AER_FATAL;
>>> + else
>>> + *severity = AER_NONFATAL;
>>> + return true;
>>> + }
>>> +
>>> + if (aer_regs->cor_status & ~aer_regs->cor_mask) {
>>> + *severity = AER_CORRECTABLE;
>>> + return true;
>>> + }
>>> +
>>> + return false;
>>> +}
>>> +
>>> +static void cxl_handle_rdport_errors(struct cxl_dev_state *cxlds)
>>> +{
>>> + struct pci_dev *pdev = to_pci_dev(cxlds->dev);
>>> + struct aer_capability_regs aer_regs;
>>> + struct cxl_dport *dport;
>>> + int severity;
>>> +
>>> + struct cxl_port *port __free(put_cxl_port) =
>>> + cxl_pci_find_port(pdev, &dport);
>>> + if (!port)
>>> + return;
>>> +
>>> + if (!cxl_rch_get_aer_info(dport->regs.dport_aer, &aer_regs))
>>> + return;
>>> +
>>> + if (!cxl_rch_get_aer_severity(&aer_regs, &severity))
>>> + return;
>>> +
>>> + pci_print_aer(pdev, severity, &aer_regs);
>>> + if (severity == AER_CORRECTABLE)
>>> + cxl_handle_cor_ras(cxlds, dport->regs.ras);
>>> + else
>>> + cxl_handle_ras(cxlds, dport->regs.ras);
>>> +}
>>> +#else
>>> +static inline void cxl_dport_map_rch_aer(struct cxl_dport *dport) { }
>>> +static inline void cxl_disable_rch_root_ints(struct cxl_dport *dport) { }
>>> +static inline void cxl_handle_rdport_errors(struct cxl_dev_state *cxlds) { }
>>> +#endif
>>> +
>>> +static void cxl_dport_map_ras(struct cxl_dport *dport)
>>> +{
>>> + struct cxl_register_map *map = &dport->reg_map;
>>> + struct device *dev = dport->dport_dev;
>>> +
>>> + if (!map->component_map.ras.valid)
>>> + dev_dbg(dev, "RAS registers not found\n");
>>> + else if (cxl_map_component_regs(map, &dport->regs.component,
>>> + BIT(CXL_CM_CAP_CAP_ID_RAS)))
>>> + dev_dbg(dev, "Failed to map RAS capability.\n");
>>> +}
>>>
>>> /**
>>> * cxl_dport_init_ras_reporting - Setup CXL RAS report on this dport
>>> @@ -270,79 +348,6 @@ static bool cxl_handle_ras(struct cxl_dev_state *cxlds, void __iomem *ras_base)
>>> return true;
>>> }
>>>
>>> -/*
>>> - * Copy the AER capability registers using 32 bit read accesses.
>>> - * This is necessary because RCRB AER capability is MMIO mapped. Clear the
>>> - * status after copying.
>>> - *
>>> - * @aer_base: base address of AER capability block in RCRB
>>> - * @aer_regs: destination for copying AER capability
>>> - */
>>> -static bool cxl_rch_get_aer_info(void __iomem *aer_base,
>>> - struct aer_capability_regs *aer_regs)
>>> -{
>>> - int read_cnt = sizeof(struct aer_capability_regs) / sizeof(u32);
>>> - u32 *aer_regs_buf = (u32 *)aer_regs;
>>> - int n;
>>> -
>>> - if (!aer_base)
>>> - return false;
>>> -
>>> - /* Use readl() to guarantee 32-bit accesses */
>>> - for (n = 0; n < read_cnt; n++)
>>> - aer_regs_buf[n] = readl(aer_base + n * sizeof(u32));
>>> -
>>> - writel(aer_regs->uncor_status, aer_base + PCI_ERR_UNCOR_STATUS);
>>> - writel(aer_regs->cor_status, aer_base + PCI_ERR_COR_STATUS);
>>> -
>>> - return true;
>>> -}
>>> -
>>> -/* Get AER severity. Return false if there is no error. */
>>> -static bool cxl_rch_get_aer_severity(struct aer_capability_regs *aer_regs,
>>> - int *severity)
>>> -{
>>> - if (aer_regs->uncor_status & ~aer_regs->uncor_mask) {
>>> - if (aer_regs->uncor_status & PCI_ERR_ROOT_FATAL_RCV)
>>> - *severity = AER_FATAL;
>>> - else
>>> - *severity = AER_NONFATAL;
>>> - return true;
>>> - }
>>> -
>>> - if (aer_regs->cor_status & ~aer_regs->cor_mask) {
>>> - *severity = AER_CORRECTABLE;
>>> - return true;
>>> - }
>>> -
>>> - return false;
>>> -}
>>> -
>>> -static void cxl_handle_rdport_errors(struct cxl_dev_state *cxlds)
>>> -{
>>> - struct pci_dev *pdev = to_pci_dev(cxlds->dev);
>>> - struct aer_capability_regs aer_regs;
>>> - struct cxl_dport *dport;
>>> - int severity;
>>> -
>>> - struct cxl_port *port __free(put_cxl_port) =
>>> - cxl_pci_find_port(pdev, &dport);
>>> - if (!port)
>>> - return;
>>> -
>>> - if (!cxl_rch_get_aer_info(dport->regs.dport_aer, &aer_regs))
>>> - return;
>>> -
>>> - if (!cxl_rch_get_aer_severity(&aer_regs, &severity))
>>> - return;
>>> -
>>> - pci_print_aer(pdev, severity, &aer_regs);
>>> - if (severity == AER_CORRECTABLE)
>>> - cxl_handle_cor_ras(cxlds, dport->regs.ras);
>>> - else
>>> - cxl_handle_ras(cxlds, dport->regs.ras);
>>> -}
>>> -
>>> void cxl_cor_error_detected(struct pci_dev *pdev)
>>> {
>>> struct cxl_dev_state *cxlds = pci_get_drvdata(pdev);
>
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