Re: [PATCH v9 1/3] PCI/DOE: Rename DOE protocol to feature

From: Bjorn Helgaas
Date: Wed Oct 18 2023 - 18:24:18 EST

Next message: Saravana Kannan: "Re: [PATCH v1] driver core: Release all resources during unbind before updating device links"
Previous message: syzbot: "Re: [syzbot] [mm?] [fs?] general protection fault in folio_flags"
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]

On Fri, Oct 13, 2023 at 01:41:56PM +1000, Alistair Francis wrote:
> DOE r1.1 replaced all occurrences of "protocol" with the term "feature"
> or "Data Object Type".
>
> PCIe r6.1 (which was published July 24) incorporated that change.
>
> Rename the existing terms protocol with feature. This patch
> also clears up some confusion of type vs protocol/feature, where
> previously feature would cover the vid and type pair.

Would you mind splitting this up? It sounds like:

- A purely textual change from "protocol" to "feature", and

- Clearing up some confusion about a vendor ID and a type?

I don't want to have sort through the cosmetic changes to find the
confusion fix, which sounds like it should have a closer look.

The words "this patch also" in a commit log is always a hint that
there are two separate things going on that might not need to be in
the same patch.

> Signed-off-by: Alistair Francis <alistair.francis@xxxxxxx>
> Reviewed-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
> Reviewed-by: Lukas Wunner <lukas@xxxxxxxxx>
> ---
> v9:
> - Rename two more DOE macros
> v8:
> - Rename prot to feat as well
> v7:
> - Initial patch
>
>
> drivers/pci/doe.c | 94 +++++++++++++++++------------------
> include/uapi/linux/pci_regs.h | 2 +-
> 2 files changed, 48 insertions(+), 48 deletions(-)
>
> diff --git a/drivers/pci/doe.c b/drivers/pci/doe.c
> index e3aab5edaf70..db2a86edf2e1 100644
> --- a/drivers/pci/doe.c
> +++ b/drivers/pci/doe.c
> @@ -22,7 +22,7 @@
>
> #include "pci.h"
>
> -#define PCI_DOE_PROTOCOL_DISCOVERY 0
> +#define PCI_DOE_FEATURE_DISCOVERY 0
>
> /* Timeout of 1 second from 6.30.2 Operation, PCI Spec r6.0 */
> #define PCI_DOE_TIMEOUT HZ
> @@ -43,7 +43,7 @@
> *
> * @pdev: PCI device this mailbox belongs to
> * @cap_offset: Capability offset
> - * @prots: Array of protocols supported (encoded as long values)
> + * @feats: Array of features supported (encoded as long values)
> * @wq: Wait queue for work item
> * @work_queue: Queue of pci_doe_work items
> * @flags: Bit array of PCI_DOE_FLAG_* flags
> @@ -51,14 +51,14 @@
> struct pci_doe_mb {
> struct pci_dev *pdev;
> u16 cap_offset;
> - struct xarray prots;
> + struct xarray feats;
>
> wait_queue_head_t wq;
> struct workqueue_struct *work_queue;
> unsigned long flags;
> };
>
> -struct pci_doe_protocol {
> +struct pci_doe_feature {
> u16 vid;
> u8 type;
> };
> @@ -66,7 +66,7 @@ struct pci_doe_protocol {
> /**
> * struct pci_doe_task - represents a single query/response
> *
> - * @prot: DOE Protocol
> + * @feat: DOE Feature
> * @request_pl: The request payload
> * @request_pl_sz: Size of the request payload (bytes)
> * @response_pl: The response payload
> @@ -78,7 +78,7 @@ struct pci_doe_protocol {
> * @doe_mb: Used internally by the mailbox
> */
> struct pci_doe_task {
> - struct pci_doe_protocol prot;
> + struct pci_doe_feature feat;
> const __le32 *request_pl;
> size_t request_pl_sz;
> __le32 *response_pl;
> @@ -171,8 +171,8 @@ static int pci_doe_send_req(struct pci_doe_mb *doe_mb,
> length = 0;
>
> /* Write DOE Header */
> - val = FIELD_PREP(PCI_DOE_DATA_OBJECT_HEADER_1_VID, task->prot.vid) |
> - FIELD_PREP(PCI_DOE_DATA_OBJECT_HEADER_1_TYPE, task->prot.type);
> + val = FIELD_PREP(PCI_DOE_DATA_OBJECT_HEADER_1_VID, task->feat.vid) |
> + FIELD_PREP(PCI_DOE_DATA_OBJECT_HEADER_1_TYPE, task->feat.type);
> pci_write_config_dword(pdev, offset + PCI_DOE_WRITE, val);
> pci_write_config_dword(pdev, offset + PCI_DOE_WRITE,
> FIELD_PREP(PCI_DOE_DATA_OBJECT_HEADER_2_LENGTH,
> @@ -217,12 +217,12 @@ static int pci_doe_recv_resp(struct pci_doe_mb *doe_mb, struct pci_doe_task *tas
> int i = 0;
> u32 val;
>
> - /* Read the first dword to get the protocol */
> + /* Read the first dword to get the feature */
> pci_read_config_dword(pdev, offset + PCI_DOE_READ, &val);
> - if ((FIELD_GET(PCI_DOE_DATA_OBJECT_HEADER_1_VID, val) != task->prot.vid) ||
> - (FIELD_GET(PCI_DOE_DATA_OBJECT_HEADER_1_TYPE, val) != task->prot.type)) {
> - dev_err_ratelimited(&pdev->dev, "[%x] expected [VID, Protocol] = [%04x, %02x], got [%04x, %02x]\n",
> - doe_mb->cap_offset, task->prot.vid, task->prot.type,
> + if ((FIELD_GET(PCI_DOE_DATA_OBJECT_HEADER_1_VID, val) != task->feat.vid) ||
> + (FIELD_GET(PCI_DOE_DATA_OBJECT_HEADER_1_TYPE, val) != task->feat.type)) {
> + dev_err_ratelimited(&pdev->dev, "[%x] expected [VID, Feature] = [%04x, %02x], got [%04x, %02x]\n",
> + doe_mb->cap_offset, task->feat.vid, task->feat.type,
> FIELD_GET(PCI_DOE_DATA_OBJECT_HEADER_1_VID, val),
> FIELD_GET(PCI_DOE_DATA_OBJECT_HEADER_1_TYPE, val));
> return -EIO;
> @@ -384,7 +384,7 @@ static void pci_doe_task_complete(struct pci_doe_task *task)
> }
>
> static int pci_doe_discovery(struct pci_doe_mb *doe_mb, u8 *index, u16 *vid,
> - u8 *protocol)
> + u8 *feature)
> {
> u32 request_pl = FIELD_PREP(PCI_DOE_DATA_OBJECT_DISC_REQ_3_INDEX,
> *index);
> @@ -393,7 +393,7 @@ static int pci_doe_discovery(struct pci_doe_mb *doe_mb, u8 *index, u16 *vid,
> u32 response_pl;
> int rc;
>
> - rc = pci_doe(doe_mb, PCI_VENDOR_ID_PCI_SIG, PCI_DOE_PROTOCOL_DISCOVERY,
> + rc = pci_doe(doe_mb, PCI_VENDOR_ID_PCI_SIG, PCI_DOE_FEATURE_DISCOVERY,
> &request_pl_le, sizeof(request_pl_le),
> &response_pl_le, sizeof(response_pl_le));
> if (rc < 0)
> @@ -404,7 +404,7 @@ static int pci_doe_discovery(struct pci_doe_mb *doe_mb, u8 *index, u16 *vid,
>
> response_pl = le32_to_cpu(response_pl_le);
> *vid = FIELD_GET(PCI_DOE_DATA_OBJECT_DISC_RSP_3_VID, response_pl);
> - *protocol = FIELD_GET(PCI_DOE_DATA_OBJECT_DISC_RSP_3_PROTOCOL,
> + *feature = FIELD_GET(PCI_DOE_DATA_OBJECT_DISC_RSP_3_TYPE,
> response_pl);
> *index = FIELD_GET(PCI_DOE_DATA_OBJECT_DISC_RSP_3_NEXT_INDEX,
> response_pl);
> @@ -412,12 +412,12 @@ static int pci_doe_discovery(struct pci_doe_mb *doe_mb, u8 *index, u16 *vid,
> return 0;
> }
>
> -static void *pci_doe_xa_prot_entry(u16 vid, u8 prot)
> +static void *pci_doe_xa_feat_entry(u16 vid, u8 type)
> {
> - return xa_mk_value((vid << 8) | prot);
> + return xa_mk_value((vid << 8) | type);
> }
>
> -static int pci_doe_cache_protocols(struct pci_doe_mb *doe_mb)
> +static int pci_doe_cache_features(struct pci_doe_mb *doe_mb)
> {
> u8 index = 0;
> u8 xa_idx = 0;
> @@ -425,18 +425,18 @@ static int pci_doe_cache_protocols(struct pci_doe_mb *doe_mb)
> do {
> int rc;
> u16 vid;
> - u8 prot;
> + u8 type;
>
> - rc = pci_doe_discovery(doe_mb, &index, &vid, &prot);
> + rc = pci_doe_discovery(doe_mb, &index, &vid, &type);
> if (rc)
> return rc;
>
> pci_dbg(doe_mb->pdev,
> - "[%x] Found protocol %d vid: %x prot: %x\n",
> - doe_mb->cap_offset, xa_idx, vid, prot);
> + "[%x] Found feature %d vid: %x type: %x\n",
> + doe_mb->cap_offset, xa_idx, vid, type);
>
> - rc = xa_insert(&doe_mb->prots, xa_idx++,
> - pci_doe_xa_prot_entry(vid, prot), GFP_KERNEL);
> + rc = xa_insert(&doe_mb->feats, xa_idx++,
> + pci_doe_xa_feat_entry(vid, type), GFP_KERNEL);
> if (rc)
> return rc;
> } while (index);
> @@ -460,7 +460,7 @@ static void pci_doe_cancel_tasks(struct pci_doe_mb *doe_mb)
> * @pdev: PCI device to create the DOE mailbox for
> * @cap_offset: Offset of the DOE mailbox
> *
> - * Create a single mailbox object to manage the mailbox protocol at the
> + * Create a single mailbox object to manage the mailbox feature at the
> * cap_offset specified.
> *
> * RETURNS: created mailbox object on success
> @@ -479,7 +479,7 @@ static struct pci_doe_mb *pci_doe_create_mb(struct pci_dev *pdev,
> doe_mb->pdev = pdev;
> doe_mb->cap_offset = cap_offset;
> init_waitqueue_head(&doe_mb->wq);
> - xa_init(&doe_mb->prots);
> + xa_init(&doe_mb->feats);
>
> doe_mb->work_queue = alloc_ordered_workqueue("%s %s DOE [%x]", 0,
> dev_bus_name(&pdev->dev),
> @@ -502,11 +502,11 @@ static struct pci_doe_mb *pci_doe_create_mb(struct pci_dev *pdev,
>
> /*
> * The state machine and the mailbox should be in sync now;
> - * Use the mailbox to query protocols.
> + * Use the mailbox to query features.
> */
> - rc = pci_doe_cache_protocols(doe_mb);
> + rc = pci_doe_cache_features(doe_mb);
> if (rc) {
> - pci_err(pdev, "[%x] failed to cache protocols : %d\n",
> + pci_err(pdev, "[%x] failed to cache features : %d\n",
> doe_mb->cap_offset, rc);
> goto err_cancel;
> }
> @@ -515,7 +515,7 @@ static struct pci_doe_mb *pci_doe_create_mb(struct pci_dev *pdev,
>
> err_cancel:
> pci_doe_cancel_tasks(doe_mb);
> - xa_destroy(&doe_mb->prots);
> + xa_destroy(&doe_mb->feats);
> err_destroy_wq:
> destroy_workqueue(doe_mb->work_queue);
> err_free:
> @@ -533,31 +533,31 @@ static struct pci_doe_mb *pci_doe_create_mb(struct pci_dev *pdev,
> static void pci_doe_destroy_mb(struct pci_doe_mb *doe_mb)
> {
> pci_doe_cancel_tasks(doe_mb);
> - xa_destroy(&doe_mb->prots);
> + xa_destroy(&doe_mb->feats);
> destroy_workqueue(doe_mb->work_queue);
> kfree(doe_mb);
> }
>
> /**
> - * pci_doe_supports_prot() - Return if the DOE instance supports the given
> - * protocol
> + * pci_doe_supports_feat() - Return if the DOE instance supports the given
> + * feature
> * @doe_mb: DOE mailbox capability to query
> - * @vid: Protocol Vendor ID
> - * @type: Protocol type
> + * @vid: Feature Vendor ID
> + * @type: Feature type
> *
> - * RETURNS: True if the DOE mailbox supports the protocol specified
> + * RETURNS: True if the DOE mailbox supports the feature specified
> */
> -static bool pci_doe_supports_prot(struct pci_doe_mb *doe_mb, u16 vid, u8 type)
> +static bool pci_doe_supports_feat(struct pci_doe_mb *doe_mb, u16 vid, u8 type)
> {
> unsigned long index;
> void *entry;
>
> - /* The discovery protocol must always be supported */
> - if (vid == PCI_VENDOR_ID_PCI_SIG && type == PCI_DOE_PROTOCOL_DISCOVERY)
> + /* The discovery feature must always be supported */
> + if (vid == PCI_VENDOR_ID_PCI_SIG && type == PCI_DOE_FEATURE_DISCOVERY)
> return true;
>
> - xa_for_each(&doe_mb->prots, index, entry)
> - if (entry == pci_doe_xa_prot_entry(vid, type))
> + xa_for_each(&doe_mb->feats, index, entry)
> + if (entry == pci_doe_xa_feat_entry(vid, type))
> return true;
>
> return false;
> @@ -585,7 +585,7 @@ static bool pci_doe_supports_prot(struct pci_doe_mb *doe_mb, u16 vid, u8 type)
> static int pci_doe_submit_task(struct pci_doe_mb *doe_mb,
> struct pci_doe_task *task)
> {
> - if (!pci_doe_supports_prot(doe_mb, task->prot.vid, task->prot.type))
> + if (!pci_doe_supports_feat(doe_mb, task->feat.vid, task->feat.type))
> return -EINVAL;
>
> if (test_bit(PCI_DOE_FLAG_DEAD, &doe_mb->flags))
> @@ -631,8 +631,8 @@ int pci_doe(struct pci_doe_mb *doe_mb, u16 vendor, u8 type,
> {
> DECLARE_COMPLETION_ONSTACK(c);
> struct pci_doe_task task = {
> - .prot.vid = vendor,
> - .prot.type = type,
> + .feat.vid = vendor,
> + .feat.type = type,
> .request_pl = request,
> .request_pl_sz = request_sz,
> .response_pl = response,
> @@ -659,7 +659,7 @@ EXPORT_SYMBOL_GPL(pci_doe);
> * @vendor: Vendor ID
> * @type: Data Object Type
> *
> - * Find first DOE mailbox of a PCI device which supports the given protocol.
> + * Find first DOE mailbox of a PCI device which supports the given feature.
> *
> * RETURNS: Pointer to the DOE mailbox or NULL if none was found.
> */
> @@ -670,7 +670,7 @@ struct pci_doe_mb *pci_find_doe_mailbox(struct pci_dev *pdev, u16 vendor,
> unsigned long index;
>
> xa_for_each(&pdev->doe_mbs, index, doe_mb)
> - if (pci_doe_supports_prot(doe_mb, vendor, type))
> + if (pci_doe_supports_feat(doe_mb, vendor, type))
> return doe_mb;
>
> return NULL;
> diff --git a/include/uapi/linux/pci_regs.h b/include/uapi/linux/pci_regs.h
> index e5f558d96493..26ca62bd3473 100644
> --- a/include/uapi/linux/pci_regs.h
> +++ b/include/uapi/linux/pci_regs.h
> @@ -1131,7 +1131,7 @@
>
> #define PCI_DOE_DATA_OBJECT_DISC_REQ_3_INDEX 0x000000ff
> #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_TYPE 0x00ff0000
> #define PCI_DOE_DATA_OBJECT_DISC_RSP_3_NEXT_INDEX 0xff000000
>
> #endif /* LINUX_PCI_REGS_H */
> --
> 2.40.1
>

Next message: Saravana Kannan: "Re: [PATCH v1] driver core: Release all resources during unbind before updating device links"
Previous message: syzbot: "Re: [syzbot] [mm?] [fs?] general protection fault in folio_flags"
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]