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

From: Alistair Francis
Date: Thu Nov 02 2023 - 20:19:20 EST

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On Thu, Oct 19, 2023 at 8:24 AM Bjorn Helgaas <helgaas@xxxxxxxxxx> wrote:
>
> 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?

These are both just renaming.

- protocol -> feature
- prot -> type

The newest PCIe spec doesn't use protocol any more, instead they use
feature and Data Object Type. So this patch is just renaming things to
match.

I have split the patch up into two rename operations in the next version

Alistair

>
> 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
> >

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