@@ -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;
}
@@ -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,
@@ -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;
@@ -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);
};
/**
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. 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: e92affc74cd8 ("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> --- drivers/platform/x86/intel/pmt/class.c | 8 +++++--- drivers/platform/x86/intel/pmt/class.h | 2 +- drivers/platform/x86/intel/pmt/telemetry.c | 2 +- include/linux/intel_vsec.h | 3 ++- 4 files changed, 9 insertions(+), 6 deletions(-)