mbox series

[v1,0/2] mlxbf-bootctl: Support access to the large icm size and setting the BlueField boot state.

Message ID 20230809141513.9058-1-asmaa@nvidia.com
Headers
Series mlxbf-bootctl: Support access to the large icm size and setting the BlueField boot state. |

Message

Asmaa Mnebhi Aug. 9, 2023, 2:15 p.m. UTC 
  Support 2 new features for the mlxbf-bootctl driver:
1) Enable reading and writing the size of the memory region
   dedicated to the large ICM carveout.
2) Enable setting the BlueField ARM boot state to "os up".
   The SMC call involved will handle updating the state in
   BlueField registers.

Asmaa Mnebhi (2):
  mlxbf-bootctl: Support the large icmc write/read
  mlxbf-bootctl: Support setting the ARM boot state to "OS up"

 drivers/platform/mellanox/mlxbf-bootctl.c | 67 +++++++++++++++++++++++
 drivers/platform/mellanox/mlxbf-bootctl.h | 14 +++++
 2 files changed, 81 insertions(+)

Comments

Vadim Pasternak Aug. 9, 2023, 2:33 p.m. UTC | #1 
> -----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 1/2] mlxbf-bootctl: Support the large icmc write/read
> 
> Enable reading and writing the size of the memory region associated with the
> large ICM carveout.
> The max size of the large ICM carveout is 1TB, has a granularity of 128MB and
> will be passed and printed in hex. The size unit is MB.
> 
> Signed-off-by: Asmaa Mnebhi <asmaa@nvidia.com>
> ---
>  drivers/platform/mellanox/mlxbf-bootctl.c | 42 +++++++++++++++++++++++
> drivers/platform/mellanox/mlxbf-bootctl.h |  9 +++++
>  2 files changed, 51 insertions(+)
> 
> diff --git a/drivers/platform/mellanox/mlxbf-bootctl.c
> b/drivers/platform/mellanox/mlxbf-bootctl.c
> index fb9f7815c6cd..3ea11250b681 100644
> --- a/drivers/platform/mellanox/mlxbf-bootctl.c
> +++ b/drivers/platform/mellanox/mlxbf-bootctl.c
> @@ -79,6 +79,8 @@ static void __iomem *mlxbf_rsh_scratch_buf_data;
> static const char * const mlxbf_rsh_log_level[] = {
>  	"INFO", "WARN", "ERR", "ASSERT"};
> 
> +static DEFINE_MUTEX(icm_ops_lock);
> +
>  /* ARM SMC call which is atomic and no need for lock. */  static int
> mlxbf_bootctl_smc(unsigned int smc_op, int smc_arg)  { @@ -391,6 +393,44
> @@ static ssize_t rsh_log_store(struct device *dev,
>  	return count;
>  }
> 
> +static ssize_t large_icm_show(struct device *dev,
> +				struct device_attribute *attr, char *buf) {
> +	struct arm_smccc_res res;
> +
> +	mutex_lock(&icm_ops_lock);
> +	arm_smccc_smc(MLNX_HANDLE_GET_ICM_INFO, 0, 0, 0, 0,
> +		      0, 0, 0, &res);
> +	mutex_unlock(&icm_ops_lock);
> +	if (res.a0)
> +		return -EPERM;
> +
> +	return snprintf(buf, PAGE_SIZE, "0x%lx", res.a1); }
> +
> +static ssize_t large_icm_store(struct device *dev,
> +			       struct device_attribute *attr,
> +			       const char *buf, size_t count) {
> +	struct arm_smccc_res res;
> +	unsigned long icm_data;
> +	int err;
> +
> +	err = kstrtoul(buf, 16, &icm_data);
> +	if (err)
> +		return err;

I suggest using define instead of 16.

> +
> +	if (((icm_data != 0) && (icm_data < 0x80)) ||
> +	    (icm_data > 0x100000) || (icm_data % 128))
> +		return -EPERM;

You can remove reduce '()' and I suggest for to use for consistency 128:
Instead of 128 and 0x80
	If ((icm_data > 0 && icm_data < 128)

Probably consider to use defines also for the above magic.

> +
> +	mutex_lock(&icm_ops_lock);
> +	arm_smccc_smc(MLNX_HANDLE_SET_ICM_INFO, icm_data, 0, 0, 0,
> 0, 0, 0, &res);
> +	mutex_unlock(&icm_ops_lock);
> +
> +	return res.a0 ? -EPERM : count;
> +}
> +
>  static DEVICE_ATTR_RW(post_reset_wdog);  static
> DEVICE_ATTR_RW(reset_action);  static
> DEVICE_ATTR_RW(second_reset_action);
> @@ -398,6 +438,7 @@ static DEVICE_ATTR_RO(lifecycle_state);  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 struct attribute *mlxbf_bootctl_attrs[] = {
>  	&dev_attr_post_reset_wdog.attr,
> @@ -407,6 +448,7 @@ static struct attribute *mlxbf_bootctl_attrs[] = {
>  	&dev_attr_secure_boot_fuse_state.attr,
>  	&dev_attr_fw_reset.attr,
>  	&dev_attr_rsh_log.attr,
> +	&dev_attr_large_icm.attr,
>  	NULL
>  };
> 
> diff --git a/drivers/platform/mellanox/mlxbf-bootctl.h
> b/drivers/platform/mellanox/mlxbf-bootctl.h
> index b48243f60a59..75d59ade92be 100644
> --- a/drivers/platform/mellanox/mlxbf-bootctl.h
> +++ b/drivers/platform/mellanox/mlxbf-bootctl.h
> @@ -81,6 +81,15 @@
>   */
>  #define MLXBF_BOOTCTL_FW_RESET  0x8200000D
> 
> +/*
> + * SMC function IDs to set and get the large ICM carveout size
> + * stored in the eeprom.
> + */
> +#define MLNX_HANDLE_SET_ICM_INFO    0x82000012
> +#define MLNX_HANDLE_GET_ICM_INFO    0x82000013
> +
> +#define MAX_ICM_BUFFER_SIZE 10
> +
>  /* 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
Vadim Pasternak Aug. 9, 2023, 2:39 p.m. UTC | #2 
> -----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