Commit b18a97ed authored by Asmaa Mnebhi's avatar Asmaa Mnebhi Committed by Hans de Goede
Browse files

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: default avatarAsmaa Mnebhi <asmaa@nvidia.com>
Reviewed-by: default avatarVadim Pasternak <vadimp@nvidia.com>
Link: https://lore.kernel.org/r/20230809162857.21243-2-asmaa@nvidia.com


Signed-off-by: default avatarHans de Goede <hdegoede@redhat.com>
parent 7295a996

drivers/platform/mellanox/mlxbf-bootctl.c

+42 −0
Original line number Diff line number Diff line
@@ -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, MLXBF_LARGE_ICMC_MAX_STRING_SIZE, &icm_data);

	if (err)

		return err;



	if ((icm_data != 0 && icm_data < MLXBF_LARGE_ICMC_SIZE_MIN) ||

	    icm_data > MLXBF_LARGE_ICMC_SIZE_MAX || icm_data % MLXBF_LARGE_ICMC_GRANULARITY)

		return -EPERM;



	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

};

drivers/platform/mellanox/mlxbf-bootctl.h

+14 −0
Original line number Diff line number Diff line
@@ -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
@@ -106,4 +115,9 @@ 
/* Additional value to disable the MLXBF_BOOTCTL_SET_SECOND_RESET_ACTION. */

#define MLXBF_BOOTCTL_NONE	0x7fffffff /* Don't change next boot action */



#define MLXBF_LARGE_ICMC_MAX_STRING_SIZE 16

#define MLXBF_LARGE_ICMC_SIZE_MIN        0x80

#define MLXBF_LARGE_ICMC_SIZE_MAX        0x100000

#define MLXBF_LARGE_ICMC_GRANULARITY     MLXBF_LARGE_ICMC_SIZE_MIN



#endif /* __MLXBF_BOOTCTL_H__ */