From: Ben Goz ben.goz@amd.com
This patch adds a new parameter to the amdkfd driver. This parameter enables the user to select the scheduling policy of the CP. The choices are:
* CP Scheduling with support for over-subscription * CP Scheduling without support for over-subscription * Without CP Scheduling
Note that the third option (Without CP scheduling) is only for debug purposes and bringup of new H/W. As such, it is _not_ guaranteed to work at all times on all H/W versions.
v3: fix description v3: change permissions to read_only v3: verify value v3: add documentation
Signed-off-by: Ben Goz ben.goz@amd.com Signed-off-by: Oded Gabbay oded.gabbay@amd.com --- drivers/gpu/drm/radeon/amdkfd/kfd_module.c | 12 ++++++++++++ drivers/gpu/drm/radeon/amdkfd/kfd_priv.h | 29 +++++++++++++++++++++++++++++ 2 files changed, 41 insertions(+)
diff --git a/drivers/gpu/drm/radeon/amdkfd/kfd_module.c b/drivers/gpu/drm/radeon/amdkfd/kfd_module.c index a31bf03..5c58031 100644 --- a/drivers/gpu/drm/radeon/amdkfd/kfd_module.c +++ b/drivers/gpu/drm/radeon/amdkfd/kfd_module.c @@ -45,6 +45,11 @@ static const struct kgd2kfd_calls kgd2kfd = { .resume = kgd2kfd_resume, };
+int sched_policy = KFD_SCHED_POLICY_HWS_NO_OVERSUBSCRIPTION; +module_param(sched_policy, int, 0444); +MODULE_PARM_DESC(sched_policy, + "Kernel cmdline parameter that defines the amdkfd scheduling policy"); + int max_num_of_processes = KFD_MAX_NUM_OF_PROCESSES_DEFAULT; module_param(max_num_of_processes, int, 0444); MODULE_PARM_DESC(max_num_of_processes, @@ -79,6 +84,13 @@ static int __init kfd_module_init(void) int err;
/* Verify module parameters */ + if ((sched_policy < KFD_SCHED_POLICY_HWS) || + (sched_policy > KFD_SCHED_POLICY_NO_HWS)) { + pr_err("kfd: sched_policy has invalid value\n"); + return -1; + } + + /* Verify module parameters */ if ((max_num_of_processes < 0) || (max_num_of_processes > KFD_MAX_NUM_OF_PROCESSES)) { pr_err("kfd: max_num_of_processes must be between 0 to KFD_MAX_NUM_OF_PROCESSES\n"); diff --git a/drivers/gpu/drm/radeon/amdkfd/kfd_priv.h b/drivers/gpu/drm/radeon/amdkfd/kfd_priv.h index 66980df..5835d07 100644 --- a/drivers/gpu/drm/radeon/amdkfd/kfd_priv.h +++ b/drivers/gpu/drm/radeon/amdkfd/kfd_priv.h @@ -65,6 +65,35 @@ extern int max_num_of_queues_per_process; #define KFD_MAX_NUM_OF_QUEUES_PER_PROCESS_DEFAULT 128 #define KFD_MAX_NUM_OF_QUEUES_PER_PROCESS 1024
+/* Kernel module parameter to specify the scheduling policy */ +extern int sched_policy; + +/** + * enum kfd_sched_policy + * + * @KFD_SCHED_POLICY_HWS: H/W scheduling policy known as command processor (cp) + * scheduling. In this scheduling mode we're using the firmware code to schedule + * the user mode queues and kernel queues such as HIQ and DIQ. + * the HIQ queue is used as a special queue that dispatches the configuration to + * the cp and the user mode queues list that are currently running. + * the DIQ queue is a debugging queue that dispatches debugging commands to the + * firmware. + * in this scheduling mode user mode queues over subscription feature is enabled. + * + * @KFD_SCHED_POLICY_HWS_NO_OVERSUBSCRIPTION: The same as above but the over + * subscription feature disabled. + * + * @KFD_SCHED_POLICY_NO_HWS: no H/W scheduling policy is a mode which directly + * set the command processor registers and sets the queues "manually". This mode + * is used *ONLY* for debugging proposes. + * + */ +enum kfd_sched_policy { + KFD_SCHED_POLICY_HWS = 0, + KFD_SCHED_POLICY_HWS_NO_OVERSUBSCRIPTION, + KFD_SCHED_POLICY_NO_HWS +}; + enum cache_policy { cache_policy_coherent, cache_policy_noncoherent