[PATCH v4] hwmon: (dell-smm) Improve assembly code

[Armin Wolf <W_Armin@gmx.de>]

The new assembly code works on both 32 bit and 64 bit
cpus and allows for more compiler optimisations.
Since clang runs out of registers on 32 bit x86 when
using CC_OUT, we need to execute "setc" ourself.
Also modify the debug message so we can still see
the result (eax) when the carry flag was set.

Tested with 32 bit and 64 bit kernels on a Dell Inspiron 3505.

Signed-off-by: Armin Wolf <W_Armin@gmx.de>
---
Changes in v4:
- reword commit message

Changes in v3:
- make carry an unsigned char
- use "+a", ... for output registers
- drop "cc" from clobbered list

Changes in v2:
- fix clang running out of registers on 32 bit x86
- modify debug message
---
 drivers/hwmon/dell-smm-hwmon.c | 78 ++++++++--------------------------
 1 file changed, 18 insertions(+), 60 deletions(-)

diff --git a/drivers/hwmon/dell-smm-hwmon.c b/drivers/hwmon/dell-smm-hwmon.c
index c5939e68586d..38d23a8e83f2 100644
--- a/drivers/hwmon/dell-smm-hwmon.c
+++ b/drivers/hwmon/dell-smm-hwmon.c
@@ -119,7 +119,7 @@ struct smm_regs {
 	unsigned int edx;
 	unsigned int esi;
 	unsigned int edi;
-} __packed;
+};

 static const char * const temp_labels[] = {
 	"CPU",
@@ -164,74 +164,32 @@ static int i8k_smm_func(void *par)
 	struct smm_regs *regs = par;
 	int eax = regs->eax;
 	int ebx = regs->ebx;
+	unsigned char carry;
 	long long duration;
-	int rc;

 	/* SMM requires CPU 0 */
 	if (smp_processor_id() != 0)
 		return -EBUSY;

-#if defined(CONFIG_X86_64)
-	asm volatile("pushq %%rax\n\t"
-		"movl 0(%%rax),%%edx\n\t"
-		"pushq %%rdx\n\t"
-		"movl 4(%%rax),%%ebx\n\t"
-		"movl 8(%%rax),%%ecx\n\t"
-		"movl 12(%%rax),%%edx\n\t"
-		"movl 16(%%rax),%%esi\n\t"
-		"movl 20(%%rax),%%edi\n\t"
-		"popq %%rax\n\t"
-		"out %%al,$0xb2\n\t"
-		"out %%al,$0x84\n\t"
-		"xchgq %%rax,(%%rsp)\n\t"
-		"movl %%ebx,4(%%rax)\n\t"
-		"movl %%ecx,8(%%rax)\n\t"
-		"movl %%edx,12(%%rax)\n\t"
-		"movl %%esi,16(%%rax)\n\t"
-		"movl %%edi,20(%%rax)\n\t"
-		"popq %%rdx\n\t"
-		"movl %%edx,0(%%rax)\n\t"
-		"pushfq\n\t"
-		"popq %%rax\n\t"
-		"andl $1,%%eax\n"
-		: "=a"(rc)
-		:    "a"(regs)
-		:    "%ebx", "%ecx", "%edx", "%esi", "%edi", "memory");
-#else
-	asm volatile("pushl %%eax\n\t"
-	    "movl 0(%%eax),%%edx\n\t"
-	    "push %%edx\n\t"
-	    "movl 4(%%eax),%%ebx\n\t"
-	    "movl 8(%%eax),%%ecx\n\t"
-	    "movl 12(%%eax),%%edx\n\t"
-	    "movl 16(%%eax),%%esi\n\t"
-	    "movl 20(%%eax),%%edi\n\t"
-	    "popl %%eax\n\t"
-	    "out %%al,$0xb2\n\t"
-	    "out %%al,$0x84\n\t"
-	    "xchgl %%eax,(%%esp)\n\t"
-	    "movl %%ebx,4(%%eax)\n\t"
-	    "movl %%ecx,8(%%eax)\n\t"
-	    "movl %%edx,12(%%eax)\n\t"
-	    "movl %%esi,16(%%eax)\n\t"
-	    "movl %%edi,20(%%eax)\n\t"
-	    "popl %%edx\n\t"
-	    "movl %%edx,0(%%eax)\n\t"
-	    "lahf\n\t"
-	    "shrl $8,%%eax\n\t"
-	    "andl $1,%%eax\n"
-	    : "=a"(rc)
-	    :    "a"(regs)
-	    :    "%ebx", "%ecx", "%edx", "%esi", "%edi", "memory");
-#endif
-	if (rc != 0 || (regs->eax & 0xffff) == 0xffff || regs->eax == eax)
-		rc = -EINVAL;
+	asm volatile("out %%al,$0xb2\n\t"
+		     "out %%al,$0x84\n\t"
+		     "setc %0\n"
+		     : "=mr" (carry),
+		       "+a" (regs->eax),
+		       "+b" (regs->ebx),
+		       "+c" (regs->ecx),
+		       "+d" (regs->edx),
+		       "+S" (regs->esi),
+		       "+D" (regs->edi));

 	duration = ktime_us_delta(ktime_get(), calltime);
-	pr_debug("smm(0x%.4x 0x%.4x) = 0x%.4x  (took %7lld usecs)\n", eax, ebx,
-		 (rc ? 0xffff : regs->eax & 0xffff), duration);
+	pr_debug("smm(0x%.4x 0x%.4x) = 0x%.4x carry: %d (took %7lld usecs)\n",
+		 eax, ebx, regs->eax & 0xffff, carry, duration);

-	return rc;
+	if (carry || (regs->eax & 0xffff) == 0xffff || regs->eax == eax)
+		return -EINVAL;
+
+	return 0;
 }

 /*
--
2.30.2