Messages in this thread Patch in this message | | | From | Vadim Pasternak <> | Subject | RE: [PATCH v1 2/2] mlxbf-bootctl: Support setting the ARM boot state to "OS up" | Date | Wed, 9 Aug 2023 14:39:48 +0000 |
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> -----Original Message----- > From: Asmaa Mnebhi <asmaa@nvidia.com> > Sent: Wednesday, 9 August 2023 17:15 > To: markgross@kernel.org; Vadim Pasternak <vadimp@nvidia.com>; > hdegoede@redhat.com; linux-kernel@vger.kernel.org > Cc: Asmaa Mnebhi <asmaa@nvidia.com> > Subject: [PATCH v1 2/2] mlxbf-bootctl: Support setting the ARM boot state to > "OS up" > > The BlueField has internal registers to store the ARM boot states. > Support setting the BlueField ARM boot state to "OS up". > > Signed-off-by: Asmaa Mnebhi <asmaa@nvidia.com>
Reviewed-by: Vadim Pasternak <vadimp@nvidia.com>
> --- > drivers/platform/mellanox/mlxbf-bootctl.c | 25 +++++++++++++++++++++++ > drivers/platform/mellanox/mlxbf-bootctl.h | 5 +++++ > 2 files changed, 30 insertions(+) > > diff --git a/drivers/platform/mellanox/mlxbf-bootctl.c > b/drivers/platform/mellanox/mlxbf-bootctl.c > index 3ea11250b681..7a67fcc6dd98 100644 > --- a/drivers/platform/mellanox/mlxbf-bootctl.c > +++ b/drivers/platform/mellanox/mlxbf-bootctl.c > @@ -80,6 +80,7 @@ static const char * const mlxbf_rsh_log_level[] = { > "INFO", "WARN", "ERR", "ASSERT"}; > > static DEFINE_MUTEX(icm_ops_lock); > +static DEFINE_MUTEX(os_up_lock); > > /* ARM SMC call which is atomic and no need for lock. */ static int > mlxbf_bootctl_smc(unsigned int smc_op, int smc_arg) @@ -431,6 +432,28 > @@ static ssize_t large_icm_store(struct device *dev, > return res.a0 ? -EPERM : count; > } > > +static ssize_t os_up_store(struct device *dev, > + struct device_attribute *attr, > + const char *buf, size_t count) > +{ > + struct arm_smccc_res res; > + unsigned long val; > + int err; > + > + err = kstrtoul(buf, 10, &val); > + if (err) > + return err; > + > + if (val != 1) > + return -EINVAL; > + > + mutex_lock(&os_up_lock); > + arm_smccc_smc(MLNX_HANDLE_OS_UP, 0, 0, 0, 0, 0, 0, 0, &res); > + mutex_unlock(&os_up_lock); > + > + return count; > +} > + > static DEVICE_ATTR_RW(post_reset_wdog); static > DEVICE_ATTR_RW(reset_action); static > DEVICE_ATTR_RW(second_reset_action); > @@ -439,6 +462,7 @@ static DEVICE_ATTR_RO(secure_boot_fuse_state); > static DEVICE_ATTR_WO(fw_reset); > static DEVICE_ATTR_WO(rsh_log); > static DEVICE_ATTR_RW(large_icm); > +static DEVICE_ATTR_WO(os_up); > > static struct attribute *mlxbf_bootctl_attrs[] = { > &dev_attr_post_reset_wdog.attr, > @@ -449,6 +473,7 @@ static struct attribute *mlxbf_bootctl_attrs[] = { > &dev_attr_fw_reset.attr, > &dev_attr_rsh_log.attr, > &dev_attr_large_icm.attr, > + &dev_attr_os_up.attr, > NULL > }; > > diff --git a/drivers/platform/mellanox/mlxbf-bootctl.h > b/drivers/platform/mellanox/mlxbf-bootctl.h > index 75d59ade92be..19142cc71312 100644 > --- a/drivers/platform/mellanox/mlxbf-bootctl.h > +++ b/drivers/platform/mellanox/mlxbf-bootctl.h > @@ -90,6 +90,11 @@ > > #define MAX_ICM_BUFFER_SIZE 10 > > +/* > + * SMC function ID to set the ARM boot state to up */ > +#define MLNX_HANDLE_OS_UP 0x82000014 > + > /* SMC function IDs for SiP Service queries */ > #define MLXBF_BOOTCTL_SIP_SVC_CALL_COUNT 0x8200ff00 > #define MLXBF_BOOTCTL_SIP_SVC_UID 0x8200ff01 > -- > 2.30.1
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