hwmon: (dell-smm) Improve assembly code
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> Link: https://lore.kernel.org/r/20220220190851.17965-1-W_Armin@gmx.de [groeck: Rebased to v5.19-rc3] Signed-off-by: Guenter Roeck <linux@roeck-us.net>
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@ -130,7 +130,7 @@ struct smm_regs {
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unsigned int edx;
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unsigned int esi;
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unsigned int edi;
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} __packed;
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};
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static const char * const temp_labels[] = {
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"CPU",
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@ -175,77 +175,35 @@ static int i8k_smm_func(void *par)
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struct smm_regs *regs = par;
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int eax = regs->eax;
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int ebx = regs->ebx;
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unsigned char carry;
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long long duration;
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int rc;
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/* SMM requires CPU 0 */
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if (smp_processor_id() != 0)
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return -EBUSY;
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#if defined(CONFIG_X86_64)
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asm volatile("pushq %%rax\n\t"
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"movl 0(%%rax),%%edx\n\t"
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"pushq %%rdx\n\t"
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"movl 4(%%rax),%%ebx\n\t"
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"movl 8(%%rax),%%ecx\n\t"
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"movl 12(%%rax),%%edx\n\t"
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"movl 16(%%rax),%%esi\n\t"
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"movl 20(%%rax),%%edi\n\t"
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"popq %%rax\n\t"
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"out %%al,$0xb2\n\t"
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"out %%al,$0x84\n\t"
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"xchgq %%rax,(%%rsp)\n\t"
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"movl %%ebx,4(%%rax)\n\t"
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"movl %%ecx,8(%%rax)\n\t"
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"movl %%edx,12(%%rax)\n\t"
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"movl %%esi,16(%%rax)\n\t"
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"movl %%edi,20(%%rax)\n\t"
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"popq %%rdx\n\t"
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"movl %%edx,0(%%rax)\n\t"
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"pushfq\n\t"
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"popq %%rax\n\t"
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"andl $1,%%eax\n"
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: "=a"(rc)
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: "a"(regs)
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: "%ebx", "%ecx", "%edx", "%esi", "%edi", "memory");
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#else
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asm volatile("pushl %%eax\n\t"
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"movl 0(%%eax),%%edx\n\t"
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"push %%edx\n\t"
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"movl 4(%%eax),%%ebx\n\t"
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"movl 8(%%eax),%%ecx\n\t"
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"movl 12(%%eax),%%edx\n\t"
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"movl 16(%%eax),%%esi\n\t"
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"movl 20(%%eax),%%edi\n\t"
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"popl %%eax\n\t"
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"out %%al,$0xb2\n\t"
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"out %%al,$0x84\n\t"
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"xchgl %%eax,(%%esp)\n\t"
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"movl %%ebx,4(%%eax)\n\t"
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"movl %%ecx,8(%%eax)\n\t"
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"movl %%edx,12(%%eax)\n\t"
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"movl %%esi,16(%%eax)\n\t"
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"movl %%edi,20(%%eax)\n\t"
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"popl %%edx\n\t"
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"movl %%edx,0(%%eax)\n\t"
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"lahf\n\t"
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"shrl $8,%%eax\n\t"
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"andl $1,%%eax\n"
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: "=a"(rc)
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: "a"(regs)
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: "%ebx", "%ecx", "%edx", "%esi", "%edi", "memory");
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#endif
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if (rc != 0 || (regs->eax & 0xffff) == 0xffff || regs->eax == eax)
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rc = -EINVAL;
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asm volatile("out %%al,$0xb2\n\t"
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"out %%al,$0x84\n\t"
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"setc %0\n"
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: "=mr" (carry),
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"+a" (regs->eax),
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"+b" (regs->ebx),
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"+c" (regs->ecx),
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"+d" (regs->edx),
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"+S" (regs->esi),
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"+D" (regs->edi));
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duration = ktime_us_delta(ktime_get(), calltime);
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pr_debug("smm(0x%.4x 0x%.4x) = 0x%.4x (took %7lld usecs)\n", eax, ebx,
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(rc ? 0xffff : regs->eax & 0xffff), duration);
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pr_debug("smm(0x%.4x 0x%.4x) = 0x%.4x carry: %d (took %7lld usecs)\n",
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eax, ebx, regs->eax & 0xffff, carry, duration);
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if (duration > DELL_SMM_MAX_DURATION)
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pr_warn_once("SMM call took %lld usecs!\n", duration);
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return rc;
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if (carry || (regs->eax & 0xffff) == 0xffff || regs->eax == eax)
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return -EINVAL;
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return 0;
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}
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/*
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