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tools/power/x86/intel-speed-select: Kernel interface error handling 

Treat a case when mailbox/mmio command can't be handled by the kernel
drivers when the module is removed or send a command which no driver can
handle. In this case ENOTTY result is returned, so print error.

Also when the isst_if_mmio module is removed, we can't send CLOS message
messages via Mailbox on non SKX based platforms. When this module is
removed,  isst_platform_info.mmio_supported is set to 0. So it can't be
used as a condition to send via mailbox. Here replace check for Skylake
based platform to send via mailbox, other platforms can't use mailbox in
lieu of MMIO.

Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
This commit is contained in:
Srinivas Pandruvada 2020-03-05 14:45:30 -08:00 committed by Andy Shevchenko
parent a9fd6ae739
commit 95f8e56945
1 changed files with 22 additions and 6 deletions
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28
tools/power/x86/intel-speed-select/isst-config.c
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@ -95,6 +95,14 @@ int is_clx_n_platform(void)
return 0;
}
int is_skx_based_platform(void)
{
if (cpu_model == 0x55)
return 1;
return 0;
}
static int update_cpu_model(void)
{
unsigned int ebx, ecx, edx;
@ -695,7 +703,11 @@ static int isst_send_mmio_command(unsigned int cpu, unsigned int reg, int write,
}
if (ioctl(fd, cmd, &io_regs) == -1) {
perror("ISST_IF_IO_CMD");
if (errno == ENOTTY) {
perror("ISST_IF_IO_COMMAND\n");
fprintf(stderr, "Check presence of kernel modules: isst_if_mmio\n");
exit(0);
}
fprintf(outf, "Error: mmio_cmd cpu:%d reg:%x read_write:%x\n",
cpu, reg, write);
} else {
@ -724,7 +736,7 @@ int isst_send_mbox_command(unsigned int cpu, unsigned char command,
"mbox_send: cpu:%d command:%x sub_command:%x parameter:%x req_data:%x\n",
cpu, command, sub_command, parameter, req_data);
if (isst_platform_info.mmio_supported && command == CONFIG_CLOS &&
if (!is_skx_based_platform() && command == CONFIG_CLOS &&
sub_command != CLOS_PM_QOS_CONFIG) {
unsigned int value;
int write = 0;
@ -774,10 +786,14 @@ int isst_send_mbox_command(unsigned int cpu, unsigned char command,
err(-1, "%s open failed", pathname);
if (ioctl(fd, ISST_IF_MBOX_COMMAND, &mbox_cmds) == -1) {
perror("ISST_IF_MBOX_COMMAND");
fprintf(outf,
"Error: mbox_cmd cpu:%d command:%x sub_command:%x parameter:%x req_data:%x\n",
cpu, command, sub_command, parameter, req_data);
if (errno == ENOTTY) {
perror("ISST_IF_MBOX_COMMAND\n");
fprintf(stderr, "Check presence of kernel modules: isst_if_mbox_pci or isst_if_mbox_msr\n");
exit(0);
}
debug_printf(
"Error: mbox_cmd cpu:%d command:%x sub_command:%x parameter:%x req_data:%x errorno:%d\n",
cpu, command, sub_command, parameter, req_data, errno);
return -1;
} else {
*resp = mbox_cmds.mbox_cmd[0].resp_data;