This patch:
- adds a doorbell bo in kfd device structure.
- creates doorbell page for kfd kernel usages.
- updates the get_kernel_doorbell and free_kernel_doorbell functions
accordingly
V2: Do not use wrapper API, use direct amdgpu_create_kernel(Alex)
V3:
- Move single variable declaration below (Christian)
- Add a to-do item to reuse the KGD kernel level doorbells for
KFD for non-MES cases, instead of reserving one page (Felix)
Cc: Alex Deucher <alexander.deucher@xxxxxxx>
Cc: Christian Koenig <christian.koenig@xxxxxxx>
Cc: Felix Kuehling <Felix.Kuehling@xxxxxxx>
Signed-off-by: Shashank Sharma <shashank.sharma@xxxxxxx>
---
drivers/gpu/drm/amd/amdkfd/kfd_device.c | 2 -
drivers/gpu/drm/amd/amdkfd/kfd_doorbell.c | 109 +++++++---------------
drivers/gpu/drm/amd/amdkfd/kfd_priv.h | 6 ++
3 files changed, 39 insertions(+), 78 deletions(-)
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_device.c b/drivers/gpu/drm/amd/amdkfd/kfd_device.c
index 00f528eb9812..36fbe9c840ee 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_device.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_device.c
@@ -437,8 +437,6 @@ struct kfd_dev *kgd2kfd_probe(struct amdgpu_device *adev, bool vf)
atomic_set(&kfd->compute_profile, 0);
mutex_init(&kfd->doorbell_mutex);
- memset(&kfd->doorbell_available_index, 0,
- sizeof(kfd->doorbell_available_index));
atomic_set(&kfd->sram_ecc_flag, 0);
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_doorbell.c b/drivers/gpu/drm/amd/amdkfd/kfd_doorbell.c
index 38c9e1ca6691..f7d45057ed32 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_doorbell.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_doorbell.c
@@ -61,81 +61,46 @@ size_t kfd_doorbell_process_slice(struct kfd_dev *kfd)
/* Doorbell calculations for device init. */
int kfd_doorbell_init(struct kfd_dev *kfd)
{
- size_t doorbell_start_offset;
- size_t doorbell_aperture_size;
- size_t doorbell_process_limit;
+ int size = PAGE_SIZE;
+ int r;
/*
- * With MES enabled, just set the doorbell base as it is needed
- * to calculate doorbell physical address.
- */
- if (kfd->shared_resources.enable_mes) {
- kfd->doorbell_base =
- kfd->shared_resources.doorbell_physical_address;
- return 0;
- }
-
- /*
- * We start with calculations in bytes because the input data might
- * only be byte-aligned.
- * Only after we have done the rounding can we assume any alignment.
+ * Todo: KFD kernel level operations need only one doorbell for
+ * ring test/HWS. So instead of reserving a whole page here for
+ * kernel, reserve and consume a doorbell from existing KGD kernel
+ * doorbell page.
*/
- doorbell_start_offset =
- roundup(kfd->shared_resources.doorbell_start_offset,
- kfd_doorbell_process_slice(kfd));
-
- doorbell_aperture_size =
- rounddown(kfd->shared_resources.doorbell_aperture_size,
- kfd_doorbell_process_slice(kfd));
-
- if (doorbell_aperture_size > doorbell_start_offset)
- doorbell_process_limit =
- (doorbell_aperture_size - doorbell_start_offset) /
- kfd_doorbell_process_slice(kfd);
- else
- return -ENOSPC;
-
- if (!kfd->max_doorbell_slices ||
- doorbell_process_limit < kfd->max_doorbell_slices)
- kfd->max_doorbell_slices = doorbell_process_limit;
-
- kfd->doorbell_base = kfd->shared_resources.doorbell_physical_address +
- doorbell_start_offset;
-
- kfd->doorbell_base_dw_offset = doorbell_start_offset / sizeof(u32);
-
- kfd->doorbell_kernel_ptr = ioremap(kfd->doorbell_base,
- kfd_doorbell_process_slice(kfd));
-
- if (!kfd->doorbell_kernel_ptr)
+ /* Bitmap to dynamically allocate doorbells from kernel page */
+ kfd->doorbell_bitmap = bitmap_zalloc(size / sizeof(u32), GFP_KERNEL);
+ if (!kfd->doorbell_bitmap) {
+ DRM_ERROR("Failed to allocate kernel doorbell bitmap\n");
return -ENOMEM;
+ }
- pr_debug("Doorbell initialization:\n");
- pr_debug("doorbell base == 0x%08lX\n",
- (uintptr_t)kfd->doorbell_base);
-
- pr_debug("doorbell_base_dw_offset == 0x%08lX\n",
- kfd->doorbell_base_dw_offset);
-
- pr_debug("doorbell_process_limit == 0x%08lX\n",
- doorbell_process_limit);
-
- pr_debug("doorbell_kernel_offset == 0x%08lX\n",
- (uintptr_t)kfd->doorbell_base);
-
- pr_debug("doorbell aperture size == 0x%08lX\n",
- kfd->shared_resources.doorbell_aperture_size);
-
- pr_debug("doorbell kernel address == %p\n", kfd->doorbell_kernel_ptr);
+ /* Alloc a doorbell page for KFD kernel usages */
+ r = amdgpu_bo_create_kernel(kfd->adev,
+ size,
+ PAGE_SIZE,
+ AMDGPU_GEM_DOMAIN_DOORBELL,
+ &kfd->doorbells,
+ NULL,
+ (void **)&kfd->doorbell_kernel_ptr);
+ if (r) {
+ pr_err("failed to allocate kernel doorbells\n");
+ bitmap_free(kfd->doorbell_bitmap);
+ return r;
+ }
+ pr_debug("Doorbell kernel address == %p\n", kfd->doorbell_kernel_ptr);
return 0;
}
void kfd_doorbell_fini(struct kfd_dev *kfd)
{
- if (kfd->doorbell_kernel_ptr)
- iounmap(kfd->doorbell_kernel_ptr);
+ bitmap_free(kfd->doorbell_bitmap);
+ amdgpu_bo_free_kernel(&kfd->doorbells, NULL,
+ (void **)&kfd->doorbell_kernel_ptr);
}
int kfd_doorbell_mmap(struct kfd_dev *dev, struct kfd_process *process,
@@ -188,22 +153,15 @@ void __iomem *kfd_get_kernel_doorbell(struct kfd_dev *kfd,
u32 inx;
mutex_lock(&kfd->doorbell_mutex);
- inx = find_first_zero_bit(kfd->doorbell_available_index,
- KFD_MAX_NUM_OF_QUEUES_PER_PROCESS);
+ inx = find_first_zero_bit(kfd->doorbell_bitmap, PAGE_SIZE / sizeof(u32));
- __set_bit(inx, kfd->doorbell_available_index);
+ __set_bit(inx, kfd->doorbell_bitmap);
mutex_unlock(&kfd->doorbell_mutex);
if (inx >= KFD_MAX_NUM_OF_QUEUES_PER_PROCESS)
return NULL;
- inx *= kfd->device_info.doorbell_size / sizeof(u32);
-
- /*
- * Calculating the kernel doorbell offset using the first
- * doorbell page.
- */
- *doorbell_off = kfd->doorbell_base_dw_offset + inx;
+ *doorbell_off = amdgpu_doorbell_index_on_bar(kfd->adev, kfd->doorbells, inx);
pr_debug("Get kernel queue doorbell\n"
" doorbell offset == 0x%08X\n"
@@ -217,11 +175,10 @@ void kfd_release_kernel_doorbell(struct kfd_dev *kfd, u32 __iomem *db_addr)
{
unsigned int inx;
- inx = (unsigned int)(db_addr - kfd->doorbell_kernel_ptr)
- * sizeof(u32) / kfd->device_info.doorbell_size;
+ inx = (unsigned int)(db_addr - kfd->doorbell_kernel_ptr);
mutex_lock(&kfd->doorbell_mutex);
- __clear_bit(inx, kfd->doorbell_available_index);
+ __clear_bit(inx, kfd->doorbell_bitmap);
mutex_unlock(&kfd->doorbell_mutex);
}
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_priv.h b/drivers/gpu/drm/amd/amdkfd/kfd_priv.h
index 94a438956868..42c215782d72 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_priv.h
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_priv.h
@@ -349,6 +349,12 @@ struct kfd_dev {
/* HMM page migration MEMORY_DEVICE_PRIVATE mapping */
struct dev_pagemap pgmap;
+
+ /* Kernel doorbells for KFD device */
+ struct amdgpu_bo *doorbells;
+
+ /* bitmap for dynamic doorbell allocation from this object */
+ unsigned long *doorbell_bitmap;
};
enum kfd_mempool {
--
2.40.1
