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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>
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1 changed files with 30 additions and 1 deletions
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@ -9,6 +9,7 @@
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*/
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*/
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#include <linux/kernel.h>
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#include <linux/kernel.h>
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#include <linux/io-64-nonatomic-lo-hi.h>
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#include <linux/module.h>
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#include <linux/module.h>
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#include <linux/mm.h>
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#include <linux/mm.h>
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#include <linux/pci.h>
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#include <linux/pci.h>
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@ -19,6 +20,7 @@
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#define PMT_XA_START 0
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#define PMT_XA_START 0
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#define PMT_XA_MAX INT_MAX
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#define PMT_XA_MAX INT_MAX
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#define PMT_XA_LIMIT XA_LIMIT(PMT_XA_START, PMT_XA_MAX)
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#define PMT_XA_LIMIT XA_LIMIT(PMT_XA_START, PMT_XA_MAX)
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#define GUID_SPR_PUNIT 0x9956f43f
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bool intel_pmt_is_early_client_hw(struct device *dev)
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bool intel_pmt_is_early_client_hw(struct device *dev)
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{
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{
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@ -33,6 +35,29 @@ bool intel_pmt_is_early_client_hw(struct device *dev)
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}
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}
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EXPORT_SYMBOL_GPL(intel_pmt_is_early_client_hw);
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EXPORT_SYMBOL_GPL(intel_pmt_is_early_client_hw);
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static inline int
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pmt_memcpy64_fromio(void *to, const u64 __iomem *from, size_t count)
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{
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int i, remain;
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u64 *buf = to;
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if (!IS_ALIGNED((unsigned long)from, 8))
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return -EFAULT;
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for (i = 0; i < count/8; i++)
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buf[i] = readq(&from[i]);
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/* Copy any remaining bytes */
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remain = count % 8;
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if (remain) {
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u64 tmp = readq(&from[i]);
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memcpy(&buf[i], &tmp, remain);
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}
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return count;
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}
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/*
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/*
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* sysfs
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* sysfs
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*/
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*/
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@ -54,7 +79,11 @@ intel_pmt_read(struct file *filp, struct kobject *kobj,
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if (count > entry->size - off)
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if (count > entry->size - off)
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count = entry->size - off;
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count = entry->size - off;
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memcpy_fromio(buf, entry->base + off, count);
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if (entry->guid == GUID_SPR_PUNIT)
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/* PUNIT on SPR only supports aligned 64-bit read */
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count = pmt_memcpy64_fromio(buf, entry->base + off, count);
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else
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memcpy_fromio(buf, entry->base + off, count);
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return count;
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return count;
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}
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}
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