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Diffstat (limited to 'arch/riscv/kernel/sbi.c')
-rw-r--r--arch/riscv/kernel/sbi.c253
1 files changed, 249 insertions, 4 deletions
diff --git a/arch/riscv/kernel/sbi.c b/arch/riscv/kernel/sbi.c
index 1368da62ec82..1cc0052e1b63 100644
--- a/arch/riscv/kernel/sbi.c
+++ b/arch/riscv/kernel/sbi.c
@@ -8,6 +8,7 @@
#include <linux/init.h>
#include <linux/pm.h>
#include <asm/sbi.h>
+#include <asm/smp.h>
/* default SBI version is 0.1 */
unsigned long sbi_spec_version = SBI_SPEC_VERSION_DEFAULT;
@@ -191,6 +192,153 @@ static int __sbi_rfence_v01(int fid, const unsigned long *hart_mask,
}
#endif /* CONFIG_RISCV_SBI_V01 */
+static void __sbi_set_timer_v02(uint64_t stime_value)
+{
+#if __riscv_xlen == 32
+ sbi_ecall(SBI_EXT_TIME, SBI_EXT_TIME_SET_TIMER, stime_value,
+ stime_value >> 32, 0, 0, 0, 0);
+#else
+ sbi_ecall(SBI_EXT_TIME, SBI_EXT_TIME_SET_TIMER, stime_value, 0,
+ 0, 0, 0, 0);
+#endif
+}
+
+static int __sbi_send_ipi_v02(const unsigned long *hart_mask)
+{
+ unsigned long hartid, hmask_val, hbase;
+ struct cpumask tmask;
+ struct sbiret ret = {0};
+ int result;
+
+ if (!hart_mask || !(*hart_mask)) {
+ riscv_cpuid_to_hartid_mask(cpu_online_mask, &tmask);
+ hart_mask = cpumask_bits(&tmask);
+ }
+
+ hmask_val = 0;
+ hbase = 0;
+ for_each_set_bit(hartid, hart_mask, NR_CPUS) {
+ if (hmask_val && ((hbase + BITS_PER_LONG) <= hartid)) {
+ ret = sbi_ecall(SBI_EXT_IPI, SBI_EXT_IPI_SEND_IPI,
+ hmask_val, hbase, 0, 0, 0, 0);
+ if (ret.error)
+ goto ecall_failed;
+ hmask_val = 0;
+ hbase = 0;
+ }
+ if (!hmask_val)
+ hbase = hartid;
+ hmask_val |= 1UL << (hartid - hbase);
+ }
+
+ if (hmask_val) {
+ ret = sbi_ecall(SBI_EXT_IPI, SBI_EXT_IPI_SEND_IPI,
+ hmask_val, hbase, 0, 0, 0, 0);
+ if (ret.error)
+ goto ecall_failed;
+ }
+
+ return 0;
+
+ecall_failed:
+ result = sbi_err_map_linux_errno(ret.error);
+ pr_err("%s: hbase = [%lu] hmask = [0x%lx] failed (error [%d])\n",
+ __func__, hbase, hmask_val, result);
+ return result;
+}
+
+static int __sbi_rfence_v02_call(unsigned long fid, unsigned long hmask_val,
+ unsigned long hbase, unsigned long start,
+ unsigned long size, unsigned long arg4,
+ unsigned long arg5)
+{
+ struct sbiret ret = {0};
+ int ext = SBI_EXT_RFENCE;
+ int result = 0;
+
+ switch (fid) {
+ case SBI_EXT_RFENCE_REMOTE_FENCE_I:
+ ret = sbi_ecall(ext, fid, hmask_val, hbase, 0, 0, 0, 0);
+ break;
+ case SBI_EXT_RFENCE_REMOTE_SFENCE_VMA:
+ ret = sbi_ecall(ext, fid, hmask_val, hbase, start,
+ size, 0, 0);
+ break;
+ case SBI_EXT_RFENCE_REMOTE_SFENCE_VMA_ASID:
+ ret = sbi_ecall(ext, fid, hmask_val, hbase, start,
+ size, arg4, 0);
+ break;
+
+ case SBI_EXT_RFENCE_REMOTE_HFENCE_GVMA:
+ ret = sbi_ecall(ext, fid, hmask_val, hbase, start,
+ size, 0, 0);
+ break;
+ case SBI_EXT_RFENCE_REMOTE_HFENCE_GVMA_VMID:
+ ret = sbi_ecall(ext, fid, hmask_val, hbase, start,
+ size, arg4, 0);
+ break;
+ case SBI_EXT_RFENCE_REMOTE_HFENCE_VVMA:
+ ret = sbi_ecall(ext, fid, hmask_val, hbase, start,
+ size, 0, 0);
+ break;
+ case SBI_EXT_RFENCE_REMOTE_HFENCE_VVMA_ASID:
+ ret = sbi_ecall(ext, fid, hmask_val, hbase, start,
+ size, arg4, 0);
+ break;
+ default:
+ pr_err("unknown function ID [%lu] for SBI extension [%d]\n",
+ fid, ext);
+ result = -EINVAL;
+ }
+
+ if (ret.error) {
+ result = sbi_err_map_linux_errno(ret.error);
+ pr_err("%s: hbase = [%lu] hmask = [0x%lx] failed (error [%d])\n",
+ __func__, hbase, hmask_val, result);
+ }
+
+ return result;
+}
+
+static int __sbi_rfence_v02(int fid, const unsigned long *hart_mask,
+ unsigned long start, unsigned long size,
+ unsigned long arg4, unsigned long arg5)
+{
+ unsigned long hmask_val, hartid, hbase;
+ struct cpumask tmask;
+ int result;
+
+ if (!hart_mask || !(*hart_mask)) {
+ riscv_cpuid_to_hartid_mask(cpu_online_mask, &tmask);
+ hart_mask = cpumask_bits(&tmask);
+ }
+
+ hmask_val = 0;
+ hbase = 0;
+ for_each_set_bit(hartid, hart_mask, NR_CPUS) {
+ if (hmask_val && ((hbase + BITS_PER_LONG) <= hartid)) {
+ result = __sbi_rfence_v02_call(fid, hmask_val, hbase,
+ start, size, arg4, arg5);
+ if (result)
+ return result;
+ hmask_val = 0;
+ hbase = 0;
+ }
+ if (!hmask_val)
+ hbase = hartid;
+ hmask_val |= 1UL << (hartid - hbase);
+ }
+
+ if (hmask_val) {
+ result = __sbi_rfence_v02_call(fid, hmask_val, hbase,
+ start, size, arg4, arg5);
+ if (result)
+ return result;
+ }
+
+ return 0;
+}
+
/**
* sbi_set_timer() - Program the timer for next timer event.
* @stime_value: The value after which next timer event should fire.
@@ -267,6 +415,85 @@ void sbi_remote_sfence_vma_asid(const unsigned long *hart_mask,
EXPORT_SYMBOL(sbi_remote_sfence_vma_asid);
/**
+ * sbi_remote_hfence_gvma() - Execute HFENCE.GVMA instructions on given remote
+ * harts for the specified guest physical address range.
+ * @hart_mask: A cpu mask containing all the target harts.
+ * @start: Start of the guest physical address
+ * @size: Total size of the guest physical address range.
+ *
+ * Return: None
+ */
+int sbi_remote_hfence_gvma(const unsigned long *hart_mask,
+ unsigned long start,
+ unsigned long size)
+{
+ return __sbi_rfence(SBI_EXT_RFENCE_REMOTE_HFENCE_GVMA,
+ hart_mask, start, size, 0, 0);
+}
+EXPORT_SYMBOL_GPL(sbi_remote_hfence_gvma);
+
+/**
+ * sbi_remote_hfence_gvma_vmid() - Execute HFENCE.GVMA instructions on given
+ * remote harts for a guest physical address range belonging to a specific VMID.
+ *
+ * @hart_mask: A cpu mask containing all the target harts.
+ * @start: Start of the guest physical address
+ * @size: Total size of the guest physical address range.
+ * @vmid: The value of guest ID (VMID).
+ *
+ * Return: 0 if success, Error otherwise.
+ */
+int sbi_remote_hfence_gvma_vmid(const unsigned long *hart_mask,
+ unsigned long start,
+ unsigned long size,
+ unsigned long vmid)
+{
+ return __sbi_rfence(SBI_EXT_RFENCE_REMOTE_HFENCE_GVMA_VMID,
+ hart_mask, start, size, vmid, 0);
+}
+EXPORT_SYMBOL(sbi_remote_hfence_gvma_vmid);
+
+/**
+ * sbi_remote_hfence_vvma() - Execute HFENCE.VVMA instructions on given remote
+ * harts for the current guest virtual address range.
+ * @hart_mask: A cpu mask containing all the target harts.
+ * @start: Start of the current guest virtual address
+ * @size: Total size of the current guest virtual address range.
+ *
+ * Return: None
+ */
+int sbi_remote_hfence_vvma(const unsigned long *hart_mask,
+ unsigned long start,
+ unsigned long size)
+{
+ return __sbi_rfence(SBI_EXT_RFENCE_REMOTE_HFENCE_VVMA,
+ hart_mask, start, size, 0, 0);
+}
+EXPORT_SYMBOL(sbi_remote_hfence_vvma);
+
+/**
+ * sbi_remote_hfence_vvma_asid() - Execute HFENCE.VVMA instructions on given
+ * remote harts for current guest virtual address range belonging to a specific
+ * ASID.
+ *
+ * @hart_mask: A cpu mask containing all the target harts.
+ * @start: Start of the current guest virtual address
+ * @size: Total size of the current guest virtual address range.
+ * @asid: The value of address space identifier (ASID).
+ *
+ * Return: None
+ */
+int sbi_remote_hfence_vvma_asid(const unsigned long *hart_mask,
+ unsigned long start,
+ unsigned long size,
+ unsigned long asid)
+{
+ return __sbi_rfence(SBI_EXT_RFENCE_REMOTE_HFENCE_VVMA_ASID,
+ hart_mask, start, size, asid, 0);
+}
+EXPORT_SYMBOL(sbi_remote_hfence_vvma_asid);
+
+/**
* sbi_probe_extension() - Check if an SBI extension ID is supported or not.
* @extid: The extension ID to be probed.
*
@@ -332,11 +559,29 @@ int __init sbi_init(void)
if (!sbi_spec_is_0_1()) {
pr_info("SBI implementation ID=0x%lx Version=0x%lx\n",
sbi_get_firmware_id(), sbi_get_firmware_version());
+ if (sbi_probe_extension(SBI_EXT_TIME) > 0) {
+ __sbi_set_timer = __sbi_set_timer_v02;
+ pr_info("SBI v0.2 TIME extension detected\n");
+ } else {
+ __sbi_set_timer = __sbi_set_timer_v01;
+ }
+ if (sbi_probe_extension(SBI_EXT_IPI) > 0) {
+ __sbi_send_ipi = __sbi_send_ipi_v02;
+ pr_info("SBI v0.2 IPI extension detected\n");
+ } else {
+ __sbi_send_ipi = __sbi_send_ipi_v01;
+ }
+ if (sbi_probe_extension(SBI_EXT_RFENCE) > 0) {
+ __sbi_rfence = __sbi_rfence_v02;
+ pr_info("SBI v0.2 RFENCE extension detected\n");
+ } else {
+ __sbi_rfence = __sbi_rfence_v01;
+ }
+ } else {
+ __sbi_set_timer = __sbi_set_timer_v01;
+ __sbi_send_ipi = __sbi_send_ipi_v01;
+ __sbi_rfence = __sbi_rfence_v01;
}
- __sbi_set_timer = __sbi_set_timer_v01;
- __sbi_send_ipi = __sbi_send_ipi_v01;
- __sbi_rfence = __sbi_rfence_v01;
-
return 0;
}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-19 17:23:08 +0000