/*
* Verify that CPUs don't have unexpected differences that will cause problems.
*/
static void cpuinfo_sanity_check(struct cpuinfo_arm64 *cur)
{
unsigned int cpu = smp_processor_id();
struct cpuinfo_arm64 *boot = &boot_cpu_data;
unsigned int diff = 0;
/*
* The kernel can handle differing I-cache policies, but otherwise
* caches should look identical. Userspace JITs will make use of
* *minLine.
*/
diff |= CHECK_MASK(ctr, 0xffff3fff, boot, cur, cpu);
/*
* Userspace may perform DC ZVA instructions. Mismatched block sizes
* could result in too much or too little memory being zeroed if a
* process is preempted and migrated between CPUs.
*/
diff |= CHECK(dczid, boot, cur, cpu);
/* If different, timekeeping will be broken (especially with KVM) */
diff |= CHECK(cntfrq, boot, cur, cpu);
/*
* Even in big.LITTLE, processors should be identical instruction-set
* wise.
*/
diff |= CHECK(id_aa64isar0, boot, cur, cpu);
diff |= CHECK(id_aa64isar1, boot, cur, cpu);
/*
* Differing PARange support is fine as long as all peripherals and
* memory are mapped within the minimum PARange of all CPUs.
* Linux should not care about secure memory.
* ID_AA64MMFR1 is currently RES0.
*/
diff |= CHECK_MASK(id_aa64mmfr0, 0xffffffffffff0ff0, boot, cur, cpu);
diff |= CHECK(id_aa64mmfr1, boot, cur, cpu);
/*
* EL3 is not our concern.
* ID_AA64PFR1 is currently RES0.
*/
diff |= CHECK_MASK(id_aa64pfr0, 0xffffffffffff0fff, boot, cur, cpu);
diff |= CHECK(id_aa64pfr1, boot, cur, cpu);
/*
* If we have AArch32, we care about 32-bit features for compat. These
* registers should be RES0 otherwise.
*/
diff |= CHECK(id_isar0, boot, cur, cpu);
diff |= CHECK(id_isar1, boot, cur, cpu);
diff |= CHECK(id_isar2, boot, cur, cpu);
diff |= CHECK(id_isar3, boot, cur, cpu);
diff |= CHECK(id_isar4, boot, cur, cpu);
diff |= CHECK(id_isar5, boot, cur, cpu);
diff |= CHECK(id_mmfr0, boot, cur, cpu);
diff |= CHECK(id_mmfr1, boot, cur, cpu);
diff |= CHECK(id_mmfr2, boot, cur, cpu);
diff |= CHECK(id_mmfr3, boot, cur, cpu);
diff |= CHECK(id_pfr0, boot, cur, cpu);
diff |= CHECK(id_pfr1, boot, cur, cpu);
/*
* Mismatched CPU features are a recipe for disaster. Don't even
* pretend to support them.
*/
WARN_TAINT_ONCE(diff, TAINT_CPU_OUT_OF_SPEC,
"Unsupported CPU feature variation.");
}
static void gic_check_cpu_features(void)
{
WARN_TAINT_ONCE(cpus_have_cap(ARM64_HAS_SYSREG_GIC_CPUIF),
TAINT_CPU_OUT_OF_SPEC,
"GICv3 system registers enabled, broken firmware!\n");
}
struct dca_provider *ioat_dca_init(struct pci_dev *pdev, void __iomem *iobase)
{
struct dca_provider *dca;
struct ioat_dca_priv *ioatdca;
int slots;
int i;
int err;
u16 dca_offset;
u16 csi_fsb_control;
u16 pcie_control;
u8 bit;
union {
u64 full;
struct {
u32 low;
u32 high;
};
} tag_map;
if (!system_has_dca_enabled(pdev))
return NULL;
dca_offset = readw(iobase + IOAT_DCAOFFSET_OFFSET);
if (dca_offset == 0)
return NULL;
slots = ioat_dca_count_dca_slots(iobase, dca_offset);
if (slots == 0)
return NULL;
dca = alloc_dca_provider(&ioat_dca_ops,
sizeof(*ioatdca)
+ (sizeof(struct ioat_dca_slot) * slots));
if (!dca)
return NULL;
ioatdca = dca_priv(dca);
ioatdca->iobase = iobase;
ioatdca->dca_base = iobase + dca_offset;
ioatdca->max_requesters = slots;
/* some bios might not know to turn these on */
csi_fsb_control = readw(ioatdca->dca_base + IOAT3_CSI_CONTROL_OFFSET);
if ((csi_fsb_control & IOAT3_CSI_CONTROL_PREFETCH) == 0) {
csi_fsb_control |= IOAT3_CSI_CONTROL_PREFETCH;
writew(csi_fsb_control,
ioatdca->dca_base + IOAT3_CSI_CONTROL_OFFSET);
}
pcie_control = readw(ioatdca->dca_base + IOAT3_PCI_CONTROL_OFFSET);
if ((pcie_control & IOAT3_PCI_CONTROL_MEMWR) == 0) {
pcie_control |= IOAT3_PCI_CONTROL_MEMWR;
writew(pcie_control,
ioatdca->dca_base + IOAT3_PCI_CONTROL_OFFSET);
}
/* TODO version, compatibility and configuration checks */
/* copy out the APIC to DCA tag map */
tag_map.low =
readl(ioatdca->dca_base + IOAT3_APICID_TAG_MAP_OFFSET_LOW);
tag_map.high =
readl(ioatdca->dca_base + IOAT3_APICID_TAG_MAP_OFFSET_HIGH);
for (i = 0; i < 8; i++) {
bit = tag_map.full >> (8 * i);
ioatdca->tag_map[i] = bit & DCA_TAG_MAP_MASK;
}
if (dca3_tag_map_invalid(ioatdca->tag_map)) {
WARN_TAINT_ONCE(1, TAINT_FIRMWARE_WORKAROUND,
"%s %s: APICID_TAG_MAP set incorrectly by BIOS, disabling DCA\n",
dev_driver_string(&pdev->dev),
dev_name(&pdev->dev));
free_dca_provider(dca);
return NULL;
}
err = register_dca_provider(dca, &pdev->dev);
if (err) {
free_dca_provider(dca);
return NULL;
}
return dca;
}
