platform/x86/intel/pmt: Sapphire Rapids PMT errata fix

On Sapphire Rapids, due to a hardware issue affecting the PUNIT telemetry
region, reads that are not done in QWORD quantities and alignment may
return incorrect data. Use a custom 64-bit copy for this region.

Signed-off-by: David E. Box <david.e.box@linux.intel.com>
Link: https://lore.kernel.org/r/20221105034228.1376677-1-david.e.box@linux.intel.com
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>

diff --git a/drivers/platform/x86/intel/pmt/class.c b/drivers/platform/x86/intel/pmt/class.c
index 53d7fd2..46598dc 100644 (file)
--- a/drivers/platform/x86/intel/pmt/class.c
+++ b/drivers/platform/x86/intel/pmt/class.c
@@ -9,6 +9,7 @@
  */
 
 #include <linux/kernel.h>
+#include <linux/io-64-nonatomic-lo-hi.h>
 #include <linux/module.h>
 #include <linux/mm.h>
 #include <linux/pci.h>
@@ -19,6 +20,7 @@
 #define PMT_XA_START           0
 #define PMT_XA_MAX             INT_MAX
 #define PMT_XA_LIMIT           XA_LIMIT(PMT_XA_START, PMT_XA_MAX)
+#define GUID_SPR_PUNIT         0x9956f43f
 
 bool intel_pmt_is_early_client_hw(struct device *dev)
 {
@@ -33,6 +35,29 @@ bool intel_pmt_is_early_client_hw(struct device *dev)
 }
 EXPORT_SYMBOL_GPL(intel_pmt_is_early_client_hw);
 
+static inline int
+pmt_memcpy64_fromio(void *to, const u64 __iomem *from, size_t count)
+{
+       int i, remain;
+       u64 *buf = to;
+
+       if (!IS_ALIGNED((unsigned long)from, 8))
+               return -EFAULT;
+
+       for (i = 0; i < count/8; i++)
+               buf[i] = readq(&from[i]);
+
+       /* Copy any remaining bytes */
+       remain = count % 8;
+       if (remain) {
+               u64 tmp = readq(&from[i]);
+
+               memcpy(&buf[i], &tmp, remain);
+       }
+
+       return count;
+}
+
 /*
  * sysfs
  */
@@ -54,7 +79,11 @@ intel_pmt_read(struct file *filp, struct kobject *kobj,
        if (count > entry->size - off)
                count = entry->size - off;
 
-       memcpy_fromio(buf, entry->base + off, count);
+       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);
 
        return count;
 }