Re: [PATCH v8 05/27] cxl: move pci generic code

[Alejandro Lucero Palau <alucerop@amd.com>]

On 12/24/24 17:19, Jonathan Cameron wrote:
> On Mon, 16 Dec 2024 16:10:20 +0000
> alejandro.lucero-palau@amd.com wrote:
>
>> From: Alejandro Lucero <alucerop@amd.com>
>>
>> Inside cxl/core/pci.c there are helpers for CXL PCIe initialization
>> meanwhile cxl/pci.c implements the functionality for a Type3 device
>> initialization.
>>
>> Move helper functions from cxl/pci.c to cxl/core/pci.c in order to be
>> exported and shared with CXL Type2 device initialization.
> Rebase gone wrong?  What happened to call of
> cxl_dport_map_rcd_linkcap() in the original code for instance.


Wow, not sure how this happened, but thank you for seen it!

I'll fix it.

Thanks again.



> Jonathan
>
>
>> Signed-off-by: Alejandro Lucero <alucerop@amd.com>
>> Reviewed-by: Dave Jiang <dave.jiang@intel.com>
>> Reviewed-by: Ben Cheatham <benjamin.cheatham@amd.com>
>> Reviewed-by: Fan Ni <fan.ni@samsung.com>
>> ---
>>   drivers/cxl/core/pci.c | 62 ++++++++++++++++++++++++++++++++++++
>>   drivers/cxl/cxlpci.h   |  3 ++
>>   drivers/cxl/pci.c      | 71 ------------------------------------------
>>   3 files changed, 65 insertions(+), 71 deletions(-)
>>
>> diff --git a/drivers/cxl/core/pci.c b/drivers/cxl/core/pci.c
>> index bc098b2ce55d..3cca3ae438cd 100644
>> --- a/drivers/cxl/core/pci.c
>> +++ b/drivers/cxl/core/pci.c
>> @@ -1034,6 +1034,68 @@ bool cxl_endpoint_decoder_reset_detected(struct cxl_port *port)
>>   }
>>   EXPORT_SYMBOL_NS_GPL(cxl_endpoint_decoder_reset_detected, "CXL");
>>   
>> +/*
>> + * Assume that any RCIEP that emits the CXL memory expander class code
>> + * is an RCD
>> + */
>> +bool is_cxl_restricted(struct pci_dev *pdev)
>> +{
>> +	return pci_pcie_type(pdev) == PCI_EXP_TYPE_RC_END;
>> +}
>> +EXPORT_SYMBOL_NS_GPL(is_cxl_restricted, "CXL");
>> +
>> +static int cxl_rcrb_get_comp_regs(struct pci_dev *pdev,
>> +				  struct cxl_register_map *map)
>> +{
>> +	struct cxl_port *port;
>> +	struct cxl_dport *dport;
>> +	resource_size_t component_reg_phys;
>> +
>> +	*map = (struct cxl_register_map) {
>> +		.host = &pdev->dev,
>> +		.resource = CXL_RESOURCE_NONE,
>> +	};
>> +
>> +	port = cxl_pci_find_port(pdev, &dport);
>> +	if (!port)
>> +		return -EPROBE_DEFER;
>> +
>> +	component_reg_phys = cxl_rcd_component_reg_phys(&pdev->dev, dport);
>> +
>> +	put_device(&port->dev);
>> +
>> +	if (component_reg_phys == CXL_RESOURCE_NONE)
>> +		return -ENXIO;
>> +
>> +	map->resource = component_reg_phys;
>> +	map->reg_type = CXL_REGLOC_RBI_COMPONENT;
>> +	map->max_size = CXL_COMPONENT_REG_BLOCK_SIZE;
>> +
>> +	return 0;
>> +}
>> +
>> +int cxl_pci_setup_regs(struct pci_dev *pdev, enum cxl_regloc_type type,
>> +		       struct cxl_register_map *map, unsigned long *caps)
>> +{
>> +	int rc;
>> +
>> +	rc = cxl_find_regblock(pdev, type, map);
>> +
>> +	/*
>> +	 * If the Register Locator DVSEC does not exist, check if it
>> +	 * is an RCH and try to extract the Component Registers from
>> +	 * an RCRB.
>> +	 */
>> +	if (rc && type == CXL_REGLOC_RBI_COMPONENT && is_cxl_restricted(pdev))
>> +		rc = cxl_rcrb_get_comp_regs(pdev, map);
>> +
>> +	if (rc)
>> +		return rc;
>> +
>> +	return cxl_setup_regs(map, caps);
>> +}
>> +EXPORT_SYMBOL_NS_GPL(cxl_pci_setup_regs, "CXL");
>> +
>>   int cxl_pci_get_bandwidth(struct pci_dev *pdev, struct access_coordinate *c)
>>   {
>>   	int speed, bw;
>> diff --git a/drivers/cxl/cxlpci.h b/drivers/cxl/cxlpci.h
>> index eb59019fe5f3..985cca3c3350 100644
>> --- a/drivers/cxl/cxlpci.h
>> +++ b/drivers/cxl/cxlpci.h
>> @@ -113,4 +113,7 @@ void read_cdat_data(struct cxl_port *port);
>>   void cxl_cor_error_detected(struct pci_dev *pdev);
>>   pci_ers_result_t cxl_error_detected(struct pci_dev *pdev,
>>   				    pci_channel_state_t state);
>> +bool is_cxl_restricted(struct pci_dev *pdev);
>> +int cxl_pci_setup_regs(struct pci_dev *pdev, enum cxl_regloc_type type,
>> +		       struct cxl_register_map *map, unsigned long *caps);
>>   #endif /* __CXL_PCI_H__ */
>> diff --git a/drivers/cxl/pci.c b/drivers/cxl/pci.c
>> index 1fcc53df1217..89056449625f 100644
>> --- a/drivers/cxl/pci.c
>> +++ b/drivers/cxl/pci.c
>> @@ -467,77 +467,6 @@ static int cxl_pci_setup_mailbox(struct cxl_memdev_state *mds, bool irq_avail)
>>   	return 0;
>>   }
>>   
>> -/*
>> - * Assume that any RCIEP that emits the CXL memory expander class code
>> - * is an RCD
>> - */
>> -static bool is_cxl_restricted(struct pci_dev *pdev)
>> -{
>> -	return pci_pcie_type(pdev) == PCI_EXP_TYPE_RC_END;
>> -}
>> -
>> -static int cxl_rcrb_get_comp_regs(struct pci_dev *pdev,
>> -				  struct cxl_register_map *map,
>> -				  struct cxl_dport *dport)
>> -{
>> -	resource_size_t component_reg_phys;
>> -
>> -	*map = (struct cxl_register_map) {
>> -		.host = &pdev->dev,
>> -		.resource = CXL_RESOURCE_NONE,
>> -	};
>> -
>> -	struct cxl_port *port __free(put_cxl_port) =
>> -		cxl_pci_find_port(pdev, &dport);
>> -	if (!port)
>> -		return -EPROBE_DEFER;
>> -
>> -	component_reg_phys = cxl_rcd_component_reg_phys(&pdev->dev, dport);
>> -	if (component_reg_phys == CXL_RESOURCE_NONE)
>> -		return -ENXIO;
>> -
>> -	map->resource = component_reg_phys;
>> -	map->reg_type = CXL_REGLOC_RBI_COMPONENT;
>> -	map->max_size = CXL_COMPONENT_REG_BLOCK_SIZE;
>> -
>> -	return 0;
>> -}
>> -
>> -static int cxl_pci_setup_regs(struct pci_dev *pdev, enum cxl_regloc_type type,
>> -			      struct cxl_register_map *map,
>> -			      unsigned long *caps)
>> -{
>> -	int rc;
>> -
>> -	rc = cxl_find_regblock(pdev, type, map);
>> -
>> -	/*
>> -	 * If the Register Locator DVSEC does not exist, check if it
>> -	 * is an RCH and try to extract the Component Registers from
>> -	 * an RCRB.
>> -	 */
>> -	if (rc && type == CXL_REGLOC_RBI_COMPONENT && is_cxl_restricted(pdev)) {
>> -		struct cxl_dport *dport;
>> -		struct cxl_port *port __free(put_cxl_port) =
>> -			cxl_pci_find_port(pdev, &dport);
>> -		if (!port)
>> -			return -EPROBE_DEFER;
>> -
>> -		rc = cxl_rcrb_get_comp_regs(pdev, map, dport);
>> -		if (rc)
>> -			return rc;
>> -
>> -		rc = cxl_dport_map_rcd_linkcap(pdev, dport);
>> -		if (rc)
>> -			return rc;
>> -
>> -	} else if (rc) {
>> -		return rc;
>> -	}
>> -
>> -	return cxl_setup_regs(map, caps);
>> -}
>> -
>>   static int cxl_pci_ras_unmask(struct pci_dev *pdev)
>>   {
>>   	struct cxl_dev_state *cxlds = pci_get_drvdata(pdev);