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Diffstat (limited to 'arch/powerpc/platforms/powernv/setup.c')
-rw-r--r--arch/powerpc/platforms/powernv/setup.c123
1 files changed, 105 insertions, 18 deletions
diff --git a/arch/powerpc/platforms/powernv/setup.c b/arch/powerpc/platforms/powernv/setup.c
index 83498604d322..4dbb47ddbdcc 100644
--- a/arch/powerpc/platforms/powernv/setup.c
+++ b/arch/powerpc/platforms/powernv/setup.c
@@ -17,6 +17,7 @@
#include <linux/console.h>
#include <linux/delay.h>
#include <linux/irq.h>
+#include <linux/seq_buf.h>
#include <linux/seq_file.h>
#include <linux/of.h>
#include <linux/of_fdt.h>
@@ -40,7 +41,7 @@
#include "powernv.h"
-static bool fw_feature_is(const char *state, const char *name,
+static bool __init fw_feature_is(const char *state, const char *name,
struct device_node *fw_features)
{
struct device_node *np;
@@ -55,7 +56,7 @@ static bool fw_feature_is(const char *state, const char *name,
return rc;
}
-static void init_fw_feat_flags(struct device_node *np)
+static void __init init_fw_feat_flags(struct device_node *np)
{
if (fw_feature_is("enabled", "inst-spec-barrier-ori31,31,0", np))
security_ftr_set(SEC_FTR_SPEC_BAR_ORI31);
@@ -96,9 +97,18 @@ static void init_fw_feat_flags(struct device_node *np)
if (fw_feature_is("disabled", "needs-spec-barrier-for-bound-checks", np))
security_ftr_clear(SEC_FTR_BNDS_CHK_SPEC_BAR);
+
+ if (fw_feature_is("enabled", "no-need-l1d-flush-msr-pr-1-to-0", np))
+ security_ftr_clear(SEC_FTR_L1D_FLUSH_ENTRY);
+
+ if (fw_feature_is("enabled", "no-need-l1d-flush-kernel-on-user-access", np))
+ security_ftr_clear(SEC_FTR_L1D_FLUSH_UACCESS);
+
+ if (fw_feature_is("enabled", "no-need-store-drain-on-priv-state-switch", np))
+ security_ftr_clear(SEC_FTR_STF_BARRIER);
}
-static void pnv_setup_rfi_flush(void)
+static void __init pnv_setup_security_mitigations(void)
{
struct device_node *np, *fw_features;
enum l1d_flush_type type;
@@ -122,27 +132,68 @@ static void pnv_setup_rfi_flush(void)
type = L1D_FLUSH_ORI;
}
+ /*
+ * The issues addressed by the entry and uaccess flush don't affect P7
+ * or P8, so on bare metal disable them explicitly in case firmware does
+ * not include the features to disable them. POWER9 and newer processors
+ * should have the appropriate firmware flags.
+ */
+ if (pvr_version_is(PVR_POWER7) || pvr_version_is(PVR_POWER7p) ||
+ pvr_version_is(PVR_POWER8E) || pvr_version_is(PVR_POWER8NVL) ||
+ pvr_version_is(PVR_POWER8)) {
+ security_ftr_clear(SEC_FTR_L1D_FLUSH_ENTRY);
+ security_ftr_clear(SEC_FTR_L1D_FLUSH_UACCESS);
+ }
+
enable = security_ftr_enabled(SEC_FTR_FAVOUR_SECURITY) && \
(security_ftr_enabled(SEC_FTR_L1D_FLUSH_PR) || \
security_ftr_enabled(SEC_FTR_L1D_FLUSH_HV));
setup_rfi_flush(type, enable);
setup_count_cache_flush();
+
+ enable = security_ftr_enabled(SEC_FTR_FAVOUR_SECURITY) &&
+ security_ftr_enabled(SEC_FTR_L1D_FLUSH_ENTRY);
+ setup_entry_flush(enable);
+
+ enable = security_ftr_enabled(SEC_FTR_FAVOUR_SECURITY) &&
+ security_ftr_enabled(SEC_FTR_L1D_FLUSH_UACCESS);
+ setup_uaccess_flush(enable);
+
+ setup_stf_barrier();
+}
+
+static void __init pnv_check_guarded_cores(void)
+{
+ struct device_node *dn;
+ int bad_count = 0;
+
+ for_each_node_by_type(dn, "cpu") {
+ if (of_property_match_string(dn, "status", "bad") >= 0)
+ bad_count++;
+ }
+
+ if (bad_count) {
+ printk(" _ _______________\n");
+ pr_cont(" | | / \\\n");
+ pr_cont(" | | | WARNING! |\n");
+ pr_cont(" | | | |\n");
+ pr_cont(" | | | It looks like |\n");
+ pr_cont(" |_| | you have %*d |\n", 3, bad_count);
+ pr_cont(" _ | guarded cores |\n");
+ pr_cont(" (_) \\_______________/\n");
+ }
}
static void __init pnv_setup_arch(void)
{
set_arch_panic_timeout(10, ARCH_PANIC_TIMEOUT);
- pnv_setup_rfi_flush();
- setup_stf_barrier();
+ pnv_setup_security_mitigations();
/* Initialize SMP */
pnv_smp_init();
- /* Setup PCI */
- pnv_pci_init();
-
/* Setup RTC and NVRAM callbacks */
if (firmware_has_feature(FW_FEATURE_OPAL))
opal_nvram_init();
@@ -150,11 +201,36 @@ static void __init pnv_setup_arch(void)
/* Enable NAP mode */
powersave_nap = 1;
+ pnv_check_guarded_cores();
+
/* XXX PMCS */
+
+ pnv_rng_init();
+}
+
+static void __init pnv_add_hw_description(void)
+{
+ struct device_node *dn;
+ const char *s;
+
+ dn = of_find_node_by_path("/ibm,opal/firmware");
+ if (!dn)
+ return;
+
+ if (of_property_read_string(dn, "version", &s) == 0 ||
+ of_property_read_string(dn, "git-id", &s) == 0)
+ seq_buf_printf(&ppc_hw_desc, "opal:%s ", s);
+
+ if (of_property_read_string(dn, "mi-version", &s) == 0)
+ seq_buf_printf(&ppc_hw_desc, "mi:%s ", s);
+
+ of_node_put(dn);
}
static void __init pnv_init(void)
{
+ pnv_add_hw_description();
+
/*
* Initialize the LPC bus now so that legacy serial
* ports can be found on it
@@ -168,13 +244,20 @@ static void __init pnv_init(void)
#endif
add_preferred_console("hvc", 0, NULL);
+#ifdef CONFIG_PPC_64S_HASH_MMU
if (!radix_enabled()) {
+ size_t size = sizeof(struct slb_entry) * mmu_slb_size;
int i;
/* Allocate per cpu area to save old slb contents during MCE */
- for_each_possible_cpu(i)
- paca_ptrs[i]->mce_faulty_slbs = memblock_alloc_node(mmu_slb_size, __alignof__(*paca_ptrs[i]->mce_faulty_slbs), cpu_to_node(i));
+ for_each_possible_cpu(i) {
+ paca_ptrs[i]->mce_faulty_slbs =
+ memblock_alloc_node(size,
+ __alignof__(struct slb_entry),
+ cpu_to_node(i));
+ }
}
+#endif
}
static void __init pnv_init_IRQ(void)
@@ -229,10 +312,16 @@ static void __noreturn pnv_restart(char *cmd)
pnv_prepare_going_down();
do {
- if (!cmd)
+ if (!cmd || !strlen(cmd))
rc = opal_cec_reboot();
else if (strcmp(cmd, "full") == 0)
rc = opal_cec_reboot2(OPAL_REBOOT_FULL_IPL, NULL);
+ else if (strcmp(cmd, "mpipl") == 0)
+ rc = opal_cec_reboot2(OPAL_REBOOT_MPIPL, NULL);
+ else if (strcmp(cmd, "error") == 0)
+ rc = opal_cec_reboot2(OPAL_REBOOT_PLATFORM_ERROR, NULL);
+ else if (strcmp(cmd, "fast") == 0)
+ rc = opal_cec_reboot2(OPAL_REBOOT_FAST, NULL);
else
rc = OPAL_UNSUPPORTED;
@@ -390,10 +479,10 @@ static void pnv_kexec_cpu_down(int crash_shutdown, int secondary)
}
#endif /* CONFIG_KEXEC_CORE */
-#ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
+#ifdef CONFIG_MEMORY_HOTPLUG
static unsigned long pnv_memory_block_size(void)
{
- return 256UL * 1024 * 1024;
+ return memory_block_size;
}
#endif
@@ -415,9 +504,6 @@ static void __init pnv_setup_machdep_opal(void)
static int __init pnv_probe(void)
{
- if (!of_machine_is_compatible("ibm,powernv"))
- return 0;
-
if (firmware_has_feature(FW_FEATURE_OPAL))
pnv_setup_machdep_opal();
@@ -481,20 +567,21 @@ static long pnv_machine_check_early(struct pt_regs *regs)
define_machine(powernv) {
.name = "PowerNV",
+ .compatible = "ibm,powernv",
.probe = pnv_probe,
.setup_arch = pnv_setup_arch,
.init_IRQ = pnv_init_IRQ,
.show_cpuinfo = pnv_show_cpuinfo,
.get_proc_freq = pnv_get_proc_freq,
+ .discover_phbs = pnv_pci_init,
.progress = pnv_progress,
.machine_shutdown = pnv_shutdown,
.power_save = NULL,
- .calibrate_decr = generic_calibrate_decr,
.machine_check_early = pnv_machine_check_early,
#ifdef CONFIG_KEXEC_CORE
.kexec_cpu_down = pnv_kexec_cpu_down,
#endif
-#ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
+#ifdef CONFIG_MEMORY_HOTPLUG
.memory_block_size = pnv_memory_block_size,
#endif
};
generated by cgit (git 2.34.1) at 2024-04-20 08:18:11 +0000