From c68f4528a2e984d044a5f6ad1c5eca7bba9b3b4c Mon Sep 17 00:00:00 2001 From: Oded Gabbay Date: Sat, 13 Feb 2016 10:14:07 +0200 Subject: [PATCH] drm/amdkfd: Track when module's init is complete Current dependencies between amdkfd and radeon/amdgpu force the loading of amdkfd _before_ radeon and/or amdgpu are loaded. When all these kernel drivers are built as modules, this ordering is enforced by the kernel built-in mechanism of loading dependent modules. However, there is no such mechanism in case where all these drivers are compiled inside the kernel image (not as modules). The current way to enforce loading of amdkfd before radeon/amdgpu, is to put amdkfd before radeon/amdgpu in the drm Makefile, but that method is way too fragile. In addition, there is no kernel mechanism to check whether a kernel driver that is built inside the kernel image, has already been loaded. To solve this, this patch adds to kfd_module.c a new static variable, amdkfd_init_completed, that is set to 1 only when amdkfd's module initialization function has been completed (successfully). kgd2kfd_init(), which is the initialization function of the kgd-->kfd interface, and which is the first function in amdkfd called by radeon/amdgpu, will return successfully only if amdkfd_init_completed is equal 1. If amdkfd_init_completed is not equal to 1, kgd2kfd_init() will return -EPROBE_DEFER to signal radeon/amdgpu they need to defer their loading until amdkfd is loaded. Signed-off-by: Oded Gabbay Reviewed-by: Alex Deucher --- drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.c | 4 ++-- drivers/gpu/drm/amd/amdkfd/kfd_module.c | 15 ++++++++++++--- drivers/gpu/drm/amd/include/kgd_kfd_interface.h | 2 +- drivers/gpu/drm/radeon/radeon_kfd.c | 4 ++-- 4 files changed, 17 insertions(+), 8 deletions(-) diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.c index 84d68d658f8a..44ba8bed1b29 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.c @@ -70,7 +70,7 @@ bool amdgpu_amdkfd_load_interface(struct amdgpu_device *rdev) return false; } - if (!kgd2kfd_init_p(KFD_INTERFACE_VERSION, &kgd2kfd)) { + if (kgd2kfd_init_p(KFD_INTERFACE_VERSION, &kgd2kfd)) { symbol_put(kgd2kfd_init); kfd2kgd = NULL; kgd2kfd = NULL; @@ -80,7 +80,7 @@ bool amdgpu_amdkfd_load_interface(struct amdgpu_device *rdev) return true; #elif defined(CONFIG_HSA_AMD) - if (!kgd2kfd_init(KFD_INTERFACE_VERSION, &kgd2kfd)) { + if (kgd2kfd_init(KFD_INTERFACE_VERSION, &kgd2kfd)) { kfd2kgd = NULL; kgd2kfd = NULL; return false; diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_module.c b/drivers/gpu/drm/amd/amdkfd/kfd_module.c index ca8410e8683d..850a5623661f 100644 --- a/drivers/gpu/drm/amd/amdkfd/kfd_module.c +++ b/drivers/gpu/drm/amd/amdkfd/kfd_module.c @@ -59,18 +59,23 @@ module_param(send_sigterm, int, 0444); MODULE_PARM_DESC(send_sigterm, "Send sigterm to HSA process on unhandled exception (0 = disable, 1 = enable)"); -bool kgd2kfd_init(unsigned interface_version, const struct kgd2kfd_calls **g2f) +static int amdkfd_init_completed; + +int kgd2kfd_init(unsigned interface_version, const struct kgd2kfd_calls **g2f) { + if (!amdkfd_init_completed) + return -EPROBE_DEFER; + /* * Only one interface version is supported, * no kfd/kgd version skew allowed. */ if (interface_version != KFD_INTERFACE_VERSION) - return false; + return -EINVAL; *g2f = &kgd2kfd; - return true; + return 0; } EXPORT_SYMBOL(kgd2kfd_init); @@ -111,6 +116,8 @@ static int __init kfd_module_init(void) kfd_process_create_wq(); + amdkfd_init_completed = 1; + dev_info(kfd_device, "Initialized module\n"); return 0; @@ -125,6 +132,8 @@ err_pasid: static void __exit kfd_module_exit(void) { + amdkfd_init_completed = 0; + kfd_process_destroy_wq(); kfd_topology_shutdown(); kfd_chardev_exit(); diff --git a/drivers/gpu/drm/amd/include/kgd_kfd_interface.h b/drivers/gpu/drm/amd/include/kgd_kfd_interface.h index 888250b33ea8..a09d9f352871 100644 --- a/drivers/gpu/drm/amd/include/kgd_kfd_interface.h +++ b/drivers/gpu/drm/amd/include/kgd_kfd_interface.h @@ -221,7 +221,7 @@ struct kgd2kfd_calls { int (*resume)(struct kfd_dev *kfd); }; -bool kgd2kfd_init(unsigned interface_version, +int kgd2kfd_init(unsigned interface_version, const struct kgd2kfd_calls **g2f); #endif /* KGD_KFD_INTERFACE_H_INCLUDED */ diff --git a/drivers/gpu/drm/radeon/radeon_kfd.c b/drivers/gpu/drm/radeon/radeon_kfd.c index 9a4d69e59401..83c2704a7291 100644 --- a/drivers/gpu/drm/radeon/radeon_kfd.c +++ b/drivers/gpu/drm/radeon/radeon_kfd.c @@ -142,7 +142,7 @@ bool radeon_kfd_init(void) if (kgd2kfd_init_p == NULL) return false; - if (!kgd2kfd_init_p(KFD_INTERFACE_VERSION, &kgd2kfd)) { + if (kgd2kfd_init_p(KFD_INTERFACE_VERSION, &kgd2kfd)) { symbol_put(kgd2kfd_init); kgd2kfd = NULL; @@ -151,7 +151,7 @@ bool radeon_kfd_init(void) return true; #elif defined(CONFIG_HSA_AMD) - if (!kgd2kfd_init(KFD_INTERFACE_VERSION, &kgd2kfd)) { + if (kgd2kfd_init(KFD_INTERFACE_VERSION, &kgd2kfd)) { kgd2kfd = NULL; return false;