diff mbox series

[kernel,2/4] pci/doe: Support discovery version

Message ID 20240201060228.3070928-3-aik@amd.com
State New
Headers
Series pci/doe/ide: Capabilities, protocols |

Commit Message

Alexey Kardashevskiy Feb. 1, 2024, 6:02 a.m. UTC 
  PCIe spec v6.1 defines a "DOE Discovery Version" field in the DOE Discovery
Request Data Object Contents (3rd DW) as:

15:8 DOE Discovery Version – must be 02h if the Capability Version in
the Data Object Exchange Extended Capability is 02h or greater.

Add support for the version on devices with the DOE v2 capability.

Signed-off-by: Alexey Kardashevskiy <aik@amd.com>
---
 include/uapi/linux/pci_regs.h |  1 +
 drivers/pci/doe.c             | 11 ++++++++---
 2 files changed, 9 insertions(+), 3 deletions(-)

Comments

Bjorn Helgaas Feb. 8, 2024, 10 p.m. UTC | #1 
On Thu, Feb 01, 2024 at 05:02:26PM +1100, Alexey Kardashevskiy wrote:
> PCIe spec v6.1 defines a "DOE Discovery Version" field in the DOE Discovery
> Request Data Object Contents (3rd DW) as:

Please include spec section number, e.g., "PCIe r6.1, sec xx.xx".

(Also note PCI-SIG uses "revision" as the major, "version" as the
minor, so this would be "PCIe r6.1", not "PCIe v6.1".)

> 15:8 DOE Discovery Version – must be 02h if the Capability Version in
> the Data Object Exchange Extended Capability is 02h or greater.
> 
> Add support for the version on devices with the DOE v2 capability.
> 
> Signed-off-by: Alexey Kardashevskiy <aik@amd.com>
> ---
>  include/uapi/linux/pci_regs.h |  1 +
>  drivers/pci/doe.c             | 11 ++++++++---
>  2 files changed, 9 insertions(+), 3 deletions(-)
> 
> diff --git a/include/uapi/linux/pci_regs.h b/include/uapi/linux/pci_regs.h
> index a39193213ff2..b9c681f14181 100644
> --- a/include/uapi/linux/pci_regs.h
> +++ b/include/uapi/linux/pci_regs.h
> @@ -1144,6 +1144,7 @@
>  #define PCI_DOE_DATA_OBJECT_HEADER_2_LENGTH		0x0003ffff
>  
>  #define PCI_DOE_DATA_OBJECT_DISC_REQ_3_INDEX		0x000000ff
> +#define PCI_DOE_DATA_OBJECT_DISC_REQ_3_DISCOVER_VER	0x0000ff00
>  #define PCI_DOE_DATA_OBJECT_DISC_RSP_3_VID		0x0000ffff
>  #define PCI_DOE_DATA_OBJECT_DISC_RSP_3_PROTOCOL		0x00ff0000
>  #define PCI_DOE_DATA_OBJECT_DISC_RSP_3_NEXT_INDEX	0xff000000
> diff --git a/drivers/pci/doe.c b/drivers/pci/doe.c
> index 61f0531d2b1d..f57def002175 100644
> --- a/drivers/pci/doe.c
> +++ b/drivers/pci/doe.c
> @@ -381,11 +381,13 @@ static void pci_doe_task_complete(struct pci_doe_task *task)
>  	complete(task->private);
>  }
>  
> -static int pci_doe_discovery(struct pci_doe_mb *doe_mb, u8 *index, u16 *vid,
> +static int pci_doe_discovery(struct pci_doe_mb *doe_mb, u8 capver, u8 *index, u16 *vid,
>  			     u8 *protocol)
>  {
> +	u32 disver = FIELD_PREP(PCI_DOE_DATA_OBJECT_DISC_REQ_3_DISCOVER_VER,
> +				(capver >= 2) ? 2 : 0);
>  	u32 request_pl = FIELD_PREP(PCI_DOE_DATA_OBJECT_DISC_REQ_3_INDEX,
> -				    *index);
> +				    *index) | disver;
>  	__le32 request_pl_le = cpu_to_le32(request_pl);
>  	__le32 response_pl_le;
>  	u32 response_pl;
> @@ -419,13 +421,16 @@ static int pci_doe_cache_protocols(struct pci_doe_mb *doe_mb)
>  {
>  	u8 index = 0;
>  	u8 xa_idx = 0;
> +	u32 hdr = 0;
> +
> +	pci_read_config_dword(doe_mb->pdev, doe_mb->cap_offset, &hdr);
>  
>  	do {
>  		int rc;
>  		u16 vid;
>  		u8 prot;
>  
> -		rc = pci_doe_discovery(doe_mb, &index, &vid, &prot);
> +		rc = pci_doe_discovery(doe_mb, PCI_EXT_CAP_VER(hdr), &index, &vid, &prot);
>  		if (rc)
>  			return rc;
>  
> -- 
> 2.41.0
>
diff mbox series

Patch

diff --git a/include/uapi/linux/pci_regs.h b/include/uapi/linux/pci_regs.h
index a39193213ff2..b9c681f14181 100644
--- a/include/uapi/linux/pci_regs.h
+++ b/include/uapi/linux/pci_regs.h
@@ -1144,6 +1144,7 @@ 
 #define PCI_DOE_DATA_OBJECT_HEADER_2_LENGTH		0x0003ffff
 
 #define PCI_DOE_DATA_OBJECT_DISC_REQ_3_INDEX		0x000000ff
+#define PCI_DOE_DATA_OBJECT_DISC_REQ_3_DISCOVER_VER	0x0000ff00
 #define PCI_DOE_DATA_OBJECT_DISC_RSP_3_VID		0x0000ffff
 #define PCI_DOE_DATA_OBJECT_DISC_RSP_3_PROTOCOL		0x00ff0000
 #define PCI_DOE_DATA_OBJECT_DISC_RSP_3_NEXT_INDEX	0xff000000
diff --git a/drivers/pci/doe.c b/drivers/pci/doe.c
index 61f0531d2b1d..f57def002175 100644
--- a/drivers/pci/doe.c
+++ b/drivers/pci/doe.c
@@ -381,11 +381,13 @@  static void pci_doe_task_complete(struct pci_doe_task *task)
 	complete(task->private);
 }
 
-static int pci_doe_discovery(struct pci_doe_mb *doe_mb, u8 *index, u16 *vid,
+static int pci_doe_discovery(struct pci_doe_mb *doe_mb, u8 capver, u8 *index, u16 *vid,
 			     u8 *protocol)
 {
+	u32 disver = FIELD_PREP(PCI_DOE_DATA_OBJECT_DISC_REQ_3_DISCOVER_VER,
+				(capver >= 2) ? 2 : 0);
 	u32 request_pl = FIELD_PREP(PCI_DOE_DATA_OBJECT_DISC_REQ_3_INDEX,
-				    *index);
+				    *index) | disver;
 	__le32 request_pl_le = cpu_to_le32(request_pl);
 	__le32 response_pl_le;
 	u32 response_pl;
@@ -419,13 +421,16 @@  static int pci_doe_cache_protocols(struct pci_doe_mb *doe_mb)
 {
 	u8 index = 0;
 	u8 xa_idx = 0;
+	u32 hdr = 0;
+
+	pci_read_config_dword(doe_mb->pdev, doe_mb->cap_offset, &hdr);
 
 	do {
 		int rc;
 		u16 vid;
 		u8 prot;
 
-		rc = pci_doe_discovery(doe_mb, &index, &vid, &prot);
+		rc = pci_doe_discovery(doe_mb, PCI_EXT_CAP_VER(hdr), &index, &vid, &prot);
 		if (rc)
 			return rc;