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platform/x86/intel/pmt: Use PMT callbacks

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PMT providers may require device specific actions before their telemetry
may be read. If the read_telem() is assigned, call it instead of
memcpy_fromio() and return. Since this needs to be done in multiple
locations, add pmt_telem_read_mmio() as a wrapper function to perform this
and any other needed checks.

Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Reviewed-by: Michael J. Ruhl <michael.j.ruhl@intel.com>
Signed-off-by: David E. Box <david.e.box@linux.intel.com>
Link: https://lore.kernel.org/r/20240725122346.4063913-4-michael.j.ruhl@intel.com
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
This commit is contained in:
David E. Box 2024-07-25 08:23:42 -04:00 committed by Hans de Goede
parent e92affc74c
commit 045a513040
3 changed files with 32 additions and 12 deletions
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26
drivers/platform/x86/intel/pmt/class.c
View File

@ -58,6 +58,22 @@ pmt_memcpy64_fromio(void *to, const u64 __iomem *from, size_t count)
return count;
}
int pmt_telem_read_mmio(struct pci_dev *pdev, struct pmt_callbacks *cb, u32 guid, void *buf,
void __iomem *addr, u32 count)
{
if (cb && cb->read_telem)
return cb->read_telem(pdev, guid, buf, count);
if (guid == GUID_SPR_PUNIT)
/* PUNIT on SPR only supports aligned 64-bit read */
return pmt_memcpy64_fromio(buf, addr, count);
memcpy_fromio(buf, addr, count);
return count;
}
EXPORT_SYMBOL_NS_GPL(pmt_telem_read_mmio, INTEL_PMT);
/*
* sysfs
*/
@ -79,11 +95,8 @@ intel_pmt_read(struct file *filp, struct kobject *kobj,
if (count > entry->size - off)
count = entry->size - off;
if (entry->guid == GUID_SPR_PUNIT)
/* PUNIT on SPR only supports aligned 64-bit read */
count = pmt_memcpy64_fromio(buf, entry->base + off, count);
else
memcpy_fromio(buf, entry->base + off, count);
count = pmt_telem_read_mmio(entry->ep->pcidev, entry->cb, entry->header.guid, buf,
entry->base + off, count);
return count;
}
@ -239,6 +252,7 @@ static int intel_pmt_populate_entry(struct intel_pmt_entry *entry,
entry->guid = header->guid;
entry->size = header->size;
entry->cb = ivdev->priv_data;
return 0;
}
@ -300,7 +314,7 @@ static int intel_pmt_dev_register(struct intel_pmt_entry *entry,
goto fail_ioremap;
if (ns->pmt_add_endpoint) {
ret = ns->pmt_add_endpoint(entry, ivdev->pcidev);
ret = ns->pmt_add_endpoint(ivdev, entry);
if (ret)
goto fail_add_endpoint;
}

8
drivers/platform/x86/intel/pmt/class.h
View File

@ -24,6 +24,7 @@ struct pci_dev;
struct telem_endpoint {
struct pci_dev *pcidev;
struct telem_header header;
struct pmt_callbacks *cb;
void __iomem *base;
bool present;
struct kref kref;
@ -43,6 +44,7 @@ struct intel_pmt_entry {
struct kobject *kobj;
void __iomem *disc_table;
void __iomem *base;
struct pmt_callbacks *cb;
unsigned long base_addr;
size_t size;
u32 guid;
@ -55,10 +57,12 @@ struct intel_pmt_namespace {
const struct attribute_group *attr_grp;
int (*pmt_header_decode)(struct intel_pmt_entry *entry,
struct device *dev);
int (*pmt_add_endpoint)(struct intel_pmt_entry *entry,
struct pci_dev *pdev);
int (*pmt_add_endpoint)(struct intel_vsec_device *ivdev,
struct intel_pmt_entry *entry);
};
int pmt_telem_read_mmio(struct pci_dev *pdev, struct pmt_callbacks *cb, u32 guid, void *buf,
void __iomem *addr, u32 count);
bool intel_pmt_is_early_client_hw(struct device *dev);
int intel_pmt_dev_create(struct intel_pmt_entry *entry,
struct intel_pmt_namespace *ns,

10
drivers/platform/x86/intel/pmt/telemetry.c
View File

@ -93,8 +93,8 @@ static int pmt_telem_header_decode(struct intel_pmt_entry *entry,
return 0;
}
static int pmt_telem_add_endpoint(struct intel_pmt_entry *entry,
struct pci_dev *pdev)
static int pmt_telem_add_endpoint(struct intel_vsec_device *ivdev,
struct intel_pmt_entry *entry)
{
struct telem_endpoint *ep;
@ -104,13 +104,14 @@ static int pmt_telem_add_endpoint(struct intel_pmt_entry *entry,
return -ENOMEM;
ep = entry->ep;
ep->pcidev = pdev;
ep->pcidev = ivdev->pcidev;
ep->header.access_type = entry->header.access_type;
ep->header.guid = entry->header.guid;
ep->header.base_offset = entry->header.base_offset;
ep->header.size = entry->header.size;
ep->base = entry->base;
ep->present = true;
ep->cb = ivdev->priv_data;
kref_init(&ep->kref);
@ -218,7 +219,8 @@ int pmt_telem_read(struct telem_endpoint *ep, u32 id, u64 *data, u32 count)
if (offset + NUM_BYTES_QWORD(count) > size)
return -EINVAL;
memcpy_fromio(data, ep->base + offset, NUM_BYTES_QWORD(count));
pmt_telem_read_mmio(ep->pcidev, ep->cb, ep->header.guid, data, ep->base + offset,
NUM_BYTES_QWORD(count));
return ep->present ? 0 : -EPIPE;
}