From: Bjorn Helgaas <helgaas@kernel.org>
To: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>,
linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org,
Thatchanamurthy Satish <Satish.Thatchanamurt@dell.com>
Subject: Re: [PATCH v1] PCI/EDR: Align EDR implementation with PCI firmware r3.3 spec
Date: Wed, 8 May 2024 15:14:30 -0500 [thread overview]
Message-ID: <20240508201430.GA1785648@bhelgaas> (raw)
In-Reply-To: <20240501022543.1626025-1-sathyanarayanan.kuppuswamy@linux.intel.com>
On Wed, May 01, 2024 at 02:25:43AM +0000, Kuppuswamy Sathyanarayanan wrote:
> During the Error Disconnect Recover (EDR) spec transition from r3.2 ECN
> to PCI firmware spec r3.3, improvements were made to definitions of
> EDR_PORT_DPC_ENABLE_DSM (0x0C) and EDR_PORT_LOCATE_DSM(0x0D) _DSMs.
>
> Specifically,
>
> * EDR_PORT_DPC_ENABLE_DSM _DSM version changed from 5 to 6, and
> arg4 is now a package type instead of an integer in version 5.
> * EDR_PORT_LOCATE_DSM _DSM uses BIT(31) to return the status of the
> operation.
>
> Ensure _DSM implementation aligns with PCI firmware r3.3 spec
> recommendation. More details about the EDR_PORT_DPC_ENABLE_DSM and
> EDR_PORT_LOCATE_DSM _DSMs can be found in PCI firmware specification,
> r3.3, sec 4.6.12 and sec 4.6.13.
>
> While at it, fix a typo in EDR_PORT_LOCATE_DSM comments.
>
> Fixes: ac1c8e35a326 ("PCI/DPC: Add Error Disconnect Recover (EDR) support")
> Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
I split this into two patches and applied them to pci/edr for v6.10,
thanks!
Take a look here:
https://git.kernel.org/pub/scm/linux/kernel/git/pci/pci.git/log/?h=edr
and make sure I didn't mess it up (only differences are comments and
commit logs).
> ---
> drivers/pci/pcie/edr.c | 23 +++++++++++++++++------
> 1 file changed, 17 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/pci/pcie/edr.c b/drivers/pci/pcie/edr.c
> index 5f4914d313a1..fea098e22e3e 100644
> --- a/drivers/pci/pcie/edr.c
> +++ b/drivers/pci/pcie/edr.c
> @@ -35,7 +35,7 @@ static int acpi_enable_dpc(struct pci_dev *pdev)
> * Behavior when calling unsupported _DSM functions is undefined,
> * so check whether EDR_PORT_DPC_ENABLE_DSM is supported.
> */
> - if (!acpi_check_dsm(adev->handle, &pci_acpi_dsm_guid, 5,
> + if (!acpi_check_dsm(adev->handle, &pci_acpi_dsm_guid, 6,
> 1ULL << EDR_PORT_DPC_ENABLE_DSM))
> return 0;
>
> @@ -47,11 +47,11 @@ static int acpi_enable_dpc(struct pci_dev *pdev)
> argv4.package.elements = &req;
>
> /*
> - * Per Downstream Port Containment Related Enhancements ECN to PCI
> - * Firmware Specification r3.2, sec 4.6.12, EDR_PORT_DPC_ENABLE_DSM is
> - * optional. Return success if it's not implemented.
> + * Per PCI Firmware Specification r3.3, sec 4.6.12,
> + * EDR_PORT_DPC_ENABLE_DSM is optional. Return success if it's not
> + * implemented.
> */
> - obj = acpi_evaluate_dsm(adev->handle, &pci_acpi_dsm_guid, 5,
> + obj = acpi_evaluate_dsm(adev->handle, &pci_acpi_dsm_guid, 6,
> EDR_PORT_DPC_ENABLE_DSM, &argv4);
> if (!obj)
> return 0;
> @@ -86,7 +86,7 @@ static struct pci_dev *acpi_dpc_port_get(struct pci_dev *pdev)
>
> /*
> * Behavior when calling unsupported _DSM functions is undefined,
> - * so check whether EDR_PORT_DPC_ENABLE_DSM is supported.
> + * so check whether EDR_PORT_LOCATE_DSM is supported.
> */
> if (!acpi_check_dsm(adev->handle, &pci_acpi_dsm_guid, 5,
> 1ULL << EDR_PORT_LOCATE_DSM))
> @@ -103,6 +103,17 @@ static struct pci_dev *acpi_dpc_port_get(struct pci_dev *pdev)
> return NULL;
> }
>
> + /*
> + * Per PCI Firmware Specification r3.3, sec 4.6.13, bit 31 represents
> + * the success/failure of the operation. If bit 31 is set, the operation
> + * is failed.
> + */
> + if (obj->integer.value & BIT(31)) {
> + ACPI_FREE(obj);
> + pci_err(pdev, "Locate Port _DSM failed\n");
> + return NULL;
> + }
> +
> /*
> * Firmware returns DPC port BDF details in following format:
> * 15:8 = bus
> --
> 2.25.1
>
next prev parent reply other threads:[~2024-05-08 20:14 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-05-01 2:25 [PATCH v1] PCI/EDR: Align EDR implementation with PCI firmware r3.3 spec Kuppuswamy Sathyanarayanan
2024-05-01 21:50 ` Bjorn Helgaas
2024-05-01 22:07 ` Kuppuswamy Sathyanarayanan
2024-05-02 22:01 ` Thatchanamurthy, Satish
2024-05-08 20:14 ` Bjorn Helgaas [this message]
2024-05-08 20:41 ` Kuppuswamy Sathyanarayanan
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