[PATCH 23/32] hw_random/via-rng: Stop using 32-bit MSR interfaces

[Juergen Gross]

The 32-bit MSR interfaces rdmsr() and wrmsr() are planned to be
removed. Use the related 64-bit variants instead.

Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
---
 drivers/char/hw_random/via-rng.c | 29 +++++++++++++++--------------
 1 file changed, 15 insertions(+), 14 deletions(-)

diff --git a/drivers/char/hw_random/via-rng.c b/drivers/char/hw_random/via-rng.c
index a9a0a3b09c8b..b718e78d3c1c 100644
--- a/drivers/char/hw_random/via-rng.c
+++ b/drivers/char/hw_random/via-rng.c
@@ -129,7 +129,8 @@ static int via_rng_data_read(struct hwrng *rng, u32 *data)
 static int via_rng_init(struct hwrng *rng)
 {
 	struct cpuinfo_x86 *c = &cpu_data(0);
-	u32 lo, hi, old_lo;
+	u32 old_lo;
+	struct msr val;
 
 	/* VIA Nano CPUs don't have the MSR_VIA_RNG anymore.  The RNG
 	 * is always enabled if CPUID rng_en is set.  There is no
@@ -150,32 +151,32 @@ static int via_rng_init(struct hwrng *rng)
 	 * does not say to write them as zero, so I make a guess that
 	 * we restore the values we find in the register.
 	 */
-	rdmsr(MSR_VIA_RNG, lo, hi);
+	rdmsrq(MSR_VIA_RNG, val.q);
 
-	old_lo = lo;
-	lo &= ~(0x7f << VIA_STRFILT_CNT_SHIFT);
-	lo &= ~VIA_XSTORE_CNT_MASK;
-	lo &= ~(VIA_STRFILT_ENABLE | VIA_STRFILT_FAIL | VIA_RAWBITS_ENABLE);
-	lo |= VIA_RNG_ENABLE;
-	lo |= VIA_NOISESRC1;
+	old_lo = val.l;
+	val.l &= ~(0x7f << VIA_STRFILT_CNT_SHIFT);
+	val.l &= ~VIA_XSTORE_CNT_MASK;
+	val.l &= ~(VIA_STRFILT_ENABLE | VIA_STRFILT_FAIL | VIA_RAWBITS_ENABLE);
+	val.l |= VIA_RNG_ENABLE;
+	val.l |= VIA_NOISESRC1;
 
 	/* Enable secondary noise source on CPUs where it is present. */
 
 	/* Nehemiah stepping 8 and higher */
 	if ((c->x86_model == 9) && (c->x86_stepping > 7))
-		lo |= VIA_NOISESRC2;
+		val.l |= VIA_NOISESRC2;
 
 	/* Esther */
 	if (c->x86_model >= 10)
-		lo |= VIA_NOISESRC2;
+		val.l |= VIA_NOISESRC2;
 
-	if (lo != old_lo)
-		wrmsr(MSR_VIA_RNG, lo, hi);
+	if (val.l != old_lo)
+		wrmsrq(MSR_VIA_RNG, val.q);
 
 	/* perhaps-unnecessary sanity check; remove after testing if
 	   unneeded */
-	rdmsr(MSR_VIA_RNG, lo, hi);
-	if ((lo & VIA_RNG_ENABLE) == 0) {
+	rdmsrq(MSR_VIA_RNG, val.q);
+	if ((val.l & VIA_RNG_ENABLE) == 0) {
 		pr_err(PFX "cannot enable VIA C3 RNG, aborting\n");
 		return -ENODEV;
 	}
-- 
2.54.0