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platform/x86/intel/pmt: allow user offset for PMT callbacks

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Usage of the telem sysfs file allows for partial reads at an offset.
The current callback method returns the buffer starting from offset 0
only.

Include the requested offset in the callback and update the necessary
address calculations with the offset.

Note: offset addition is moved from the caller to the local usage. For
non-callback usage this is unchanged behavior.

Fixes: e92affc74c ("platform/x86/intel/vsec: Add PMT read callbacks")
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Michael J. Ruhl <michael.j.ruhl@intel.com>
Link: https://lore.kernel.org/r/20241114130358.2467787-2-michael.j.ruhl@intel.com
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
This commit is contained in:
Michael J. Ruhl 2024-11-14 08:03:57 -05:00 committed by Ilpo Järvinen
parent 8560b2775a
commit 0c32840763
No known key found for this signature in database
GPG Key ID: 59AC4F6153E5CE31
4 changed files with 9 additions and 6 deletions
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8
drivers/platform/x86/intel/pmt/class.c
View File

@ -59,10 +59,12 @@ pmt_memcpy64_fromio(void *to, const u64 __iomem *from, size_t count)
}
int pmt_telem_read_mmio(struct pci_dev *pdev, struct pmt_callbacks *cb, u32 guid, void *buf,
void __iomem *addr, u32 count)
void __iomem *addr, loff_t off, u32 count)
{
if (cb && cb->read_telem)
return cb->read_telem(pdev, guid, buf, count);
return cb->read_telem(pdev, guid, buf, off, count);
addr += off;
if (guid == GUID_SPR_PUNIT)
/* PUNIT on SPR only supports aligned 64-bit read */
@ -96,7 +98,7 @@ intel_pmt_read(struct file *filp, struct kobject *kobj,
count = entry->size - off;
count = pmt_telem_read_mmio(entry->ep->pcidev, entry->cb, entry->header.guid, buf,
entry->base + off, count);
entry->base, off, count);
return count;
}

2
drivers/platform/x86/intel/pmt/class.h
View File

@ -62,7 +62,7 @@ struct intel_pmt_namespace {
};
int pmt_telem_read_mmio(struct pci_dev *pdev, struct pmt_callbacks *cb, u32 guid, void *buf,
void __iomem *addr, u32 count);
void __iomem *addr, loff_t off, 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,

2
drivers/platform/x86/intel/pmt/telemetry.c
View File

@ -219,7 +219,7 @@ int pmt_telem_read(struct telem_endpoint *ep, u32 id, u64 *data, u32 count)
if (offset + NUM_BYTES_QWORD(count) > size)
return -EINVAL;
pmt_telem_read_mmio(ep->pcidev, ep->cb, ep->header.guid, data, ep->base + offset,
pmt_telem_read_mmio(ep->pcidev, ep->cb, ep->header.guid, data, ep->base, offset,
NUM_BYTES_QWORD(count));
return ep->present ? 0 : -EPIPE;

3
include/linux/intel_vsec.h
View File

@ -74,10 +74,11 @@ enum intel_vsec_quirks {
* @pdev: PCI device reference for the callback's use
* @guid: ID of data to acccss
* @data: buffer for the data to be copied
* @off: offset into the requested buffer
* @count: size of buffer
*/
struct pmt_callbacks {
int (*read_telem)(struct pci_dev *pdev, u32 guid, u64 *data, u32 count);
int (*read_telem)(struct pci_dev *pdev, u32 guid, u64 *data, loff_t off, u32 count);
};
/**