| Message ID | 20180310141501.2214-12-mcgrof@kernel.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Sat, Mar 10, 2018 at 06:14:52AM -0800, Luis R. Rodriguez wrote: > You currently need four different kernel builds to test the firmware > API fully. By adding a proc knob to force disable the fallback mechanism > completely we are able to reduce the amount of kernels you need built > to test the firmware API down to two. > > Acked-by: Kees Cook <keescook@chromium.org> > Signed-off-by: Luis R. Rodriguez <mcgrof@kernel.org> > --- > drivers/base/firmware_loader/fallback.c | 5 +++++ > drivers/base/firmware_loader/fallback.h | 4 ++++ > drivers/base/firmware_loader/fallback_table.c | 9 +++++++++ > 3 files changed, 18 insertions(+) > > diff --git a/drivers/base/firmware_loader/fallback.c b/drivers/base/firmware_loader/fallback.c > index 45cc40933a47..d6838e7ec00c 100644 > --- a/drivers/base/firmware_loader/fallback.c > +++ b/drivers/base/firmware_loader/fallback.c > @@ -643,6 +643,11 @@ static bool fw_force_sysfs_fallback(unsigned int opt_flags) > > static bool fw_run_sysfs_fallback(unsigned int opt_flags) > { > + if (fw_fallback_config.ignore_sysfs_fallback) { > + pr_info_once("Ignoring firmware sysfs fallback due to debugfs knob\n"); s/debugfs/sysctl/ right?
On Wed, Mar 14, 2018 at 12:00 PM, Greg KH <gregkh@linuxfoundation.org> wrote: > On Sat, Mar 10, 2018 at 06:14:52AM -0800, Luis R. Rodriguez wrote: >> You currently need four different kernel builds to test the firmware >> API fully. By adding a proc knob to force disable the fallback mechanism >> completely we are able to reduce the amount of kernels you need built >> to test the firmware API down to two. >> >> Acked-by: Kees Cook <keescook@chromium.org> >> Signed-off-by: Luis R. Rodriguez <mcgrof@kernel.org> >> --- >> drivers/base/firmware_loader/fallback.c | 5 +++++ >> drivers/base/firmware_loader/fallback.h | 4 ++++ >> drivers/base/firmware_loader/fallback_table.c | 9 +++++++++ >> 3 files changed, 18 insertions(+) >> >> diff --git a/drivers/base/firmware_loader/fallback.c b/drivers/base/firmware_loader/fallback.c >> index 45cc40933a47..d6838e7ec00c 100644 >> --- a/drivers/base/firmware_loader/fallback.c >> +++ b/drivers/base/firmware_loader/fallback.c >> @@ -643,6 +643,11 @@ static bool fw_force_sysfs_fallback(unsigned int opt_flags) >> >> static bool fw_run_sysfs_fallback(unsigned int opt_flags) >> { >> + if (fw_fallback_config.ignore_sysfs_fallback) { >> + pr_info_once("Ignoring firmware sysfs fallback due to debugfs knob\n"); > > s/debugfs/sysctl/ right? Indeed. Will respin with the other space fix. As for the other changes let me know if you have further feedback or if I should just keep them as-is. Luis
diff --git a/drivers/base/firmware_loader/fallback.c b/drivers/base/firmware_loader/fallback.c index 45cc40933a47..d6838e7ec00c 100644 --- a/drivers/base/firmware_loader/fallback.c +++ b/drivers/base/firmware_loader/fallback.c @@ -643,6 +643,11 @@ static bool fw_force_sysfs_fallback(unsigned int opt_flags) static bool fw_run_sysfs_fallback(unsigned int opt_flags) { + if (fw_fallback_config.ignore_sysfs_fallback) { + pr_info_once("Ignoring firmware sysfs fallback due to debugfs knob\n"); + return false; + } + if ((opt_flags & FW_OPT_NOFALLBACK)) return false; diff --git a/drivers/base/firmware_loader/fallback.h b/drivers/base/firmware_loader/fallback.h index ca7e69a8417b..dfebc644ed35 100644 --- a/drivers/base/firmware_loader/fallback.h +++ b/drivers/base/firmware_loader/fallback.h @@ -14,12 +14,16 @@ * as if one had enabled CONFIG_FW_LOADER_USER_HELPER_FALLBACK=y. * Useful to help debug a CONFIG_FW_LOADER_USER_HELPER_FALLBACK=y * functionality on a kernel where that config entry has been disabled. + * @ignore_sysfs_fallback: force to disable the sysfs fallback mechanism. + * This emulates the behaviour as if we had set the kernel + * config CONFIG_FW_LOADER_USER_HELPER=n. * @old_timeout: for internal use * @loading_timeout: the timeout to wait for the fallback mechanism before * giving up, in seconds. */ struct firmware_fallback_config { unsigned int force_sysfs_fallback; + unsigned int ignore_sysfs_fallback; int old_timeout; int loading_timeout; }; diff --git a/drivers/base/firmware_loader/fallback_table.c b/drivers/base/firmware_loader/fallback_table.c index 92365e053e30..7428659d8df9 100644 --- a/drivers/base/firmware_loader/fallback_table.c +++ b/drivers/base/firmware_loader/fallback_table.c @@ -39,6 +39,15 @@ struct ctl_table firmware_config_table[] = { .extra1 = &zero, .extra2 = &one, }, + { + .procname = "ignore_sysfs_fallback", + .data = &fw_fallback_config.ignore_sysfs_fallback, + .maxlen = sizeof(unsigned int), + .mode = 0644, + .proc_handler = proc_douintvec_minmax, + .extra1 = &zero, + .extra2 = &one, + }, { } }; EXPORT_SYMBOL_GPL(firmware_config_table);