[PATCH v3 11/12] drm/amdgpu: use doorbell mgr for MES kernel doorbells
Shashank Sharma
shashank.sharma at amd.com
Tue Jun 20 17:16:07 UTC 2023
This patch:
- Removes the existing doorbell management code, and its variables
from the doorbell_init function, it will be done in doorbell
manager now.
- uses the doorbell page created for MES kernel level needs (doorbells
for MES self tests)
- current MES code was allocating MES doorbells in MES process context,
but those were getting written using kernel doorbell calls. This patch
instead allocates a MES kernel doorbell for this (in add_hw_queue).
V2: Create an extra page of doorbells for MES during kernel doorbell
creation (Alex)
Cc: Alex Deucher <alexander.deucher at amd.com>
Cc: Christian Koenig <christian.koenig at amd.com>
Signed-off-by: Shashank Sharma <shashank.sharma at amd.com>
Signed-off-by: Arvind Yadav <arvind.yadav at amd.com>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_mes.c | 94 ++++++++++---------------
drivers/gpu/drm/amd/amdgpu/amdgpu_mes.h | 3 +
2 files changed, 40 insertions(+), 57 deletions(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_mes.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_mes.c
index f0f00466b59f..01c3d27512d9 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_mes.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_mes.c
@@ -67,91 +67,70 @@ unsigned int amdgpu_mes_get_doorbell_dw_offset_in_bar(
doorbell_id * 2);
}
-static int amdgpu_mes_queue_doorbell_get(struct amdgpu_device *adev,
+static int amdgpu_mes_kernel_doorbell_get(struct amdgpu_device *adev,
struct amdgpu_mes_process *process,
int ip_type, uint64_t *doorbell_index)
{
unsigned int offset, found;
+ struct amdgpu_mes *mes = &adev->mes;
- if (ip_type == AMDGPU_RING_TYPE_SDMA) {
+ if (ip_type == AMDGPU_RING_TYPE_SDMA)
offset = adev->doorbell_index.sdma_engine[0];
- found = find_next_zero_bit(process->doorbell_bitmap,
- AMDGPU_MES_MAX_NUM_OF_QUEUES_PER_PROCESS,
- offset);
- } else {
- found = find_first_zero_bit(process->doorbell_bitmap,
- AMDGPU_MES_MAX_NUM_OF_QUEUES_PER_PROCESS);
- }
+ else
+ offset = 0;
- if (found >= AMDGPU_MES_MAX_NUM_OF_QUEUES_PER_PROCESS) {
+ found = find_next_zero_bit(mes->doorbell_bitmap, mes->num_mes_dbs, offset);
+ if (found >= mes->num_mes_dbs) {
DRM_WARN("No doorbell available\n");
return -ENOSPC;
}
- set_bit(found, process->doorbell_bitmap);
-
- *doorbell_index = amdgpu_mes_get_doorbell_dw_offset_in_bar(adev,
- process->doorbell_index, found);
+ set_bit(found, mes->doorbell_bitmap);
+ /* Get the absolute doorbell index on BAR */
+ *doorbell_index = mes->db_start_dw_offset + found * 2;
return 0;
}
-static void amdgpu_mes_queue_doorbell_free(struct amdgpu_device *adev,
+static void amdgpu_mes_kernel_doorbell_free(struct amdgpu_device *adev,
struct amdgpu_mes_process *process,
uint32_t doorbell_index)
{
- unsigned int old, doorbell_id;
-
- doorbell_id = doorbell_index -
- (process->doorbell_index *
- amdgpu_mes_doorbell_process_slice(adev)) / sizeof(u32);
- doorbell_id /= 2;
+ unsigned int old, rel_index;
+ struct amdgpu_mes *mes = &adev->mes;
- old = test_and_clear_bit(doorbell_id, process->doorbell_bitmap);
+ /* Find the relative index of the doorbell in this object */
+ rel_index = (doorbell_index - mes->db_start_dw_offset) / 2;
+ old = test_and_clear_bit(rel_index, mes->doorbell_bitmap);
WARN_ON(!old);
}
static int amdgpu_mes_doorbell_init(struct amdgpu_device *adev)
{
- size_t doorbell_start_offset;
- size_t doorbell_aperture_size;
- size_t doorbell_process_limit;
- size_t aggregated_doorbell_start;
int i;
+ struct amdgpu_mes *mes = &adev->mes;
- aggregated_doorbell_start = (adev->doorbell_index.max_assignment + 1) * sizeof(u32);
- aggregated_doorbell_start =
- roundup(aggregated_doorbell_start, PAGE_SIZE);
-
- doorbell_start_offset = aggregated_doorbell_start + PAGE_SIZE;
- doorbell_start_offset =
- roundup(doorbell_start_offset,
- amdgpu_mes_doorbell_process_slice(adev));
-
- doorbell_aperture_size = adev->doorbell.size;
- doorbell_aperture_size =
- rounddown(doorbell_aperture_size,
- amdgpu_mes_doorbell_process_slice(adev));
-
- if (doorbell_aperture_size > doorbell_start_offset)
- doorbell_process_limit =
- (doorbell_aperture_size - doorbell_start_offset) /
- amdgpu_mes_doorbell_process_slice(adev);
- else
- return -ENOSPC;
-
- adev->mes.doorbell_id_offset = doorbell_start_offset / sizeof(u32);
- adev->mes.max_doorbell_slices = doorbell_process_limit;
+ /* Bitmap for dynamic allocation of kernel doorbells */
+ mes->doorbell_bitmap = bitmap_zalloc(PAGE_SIZE / sizeof(u32), GFP_KERNEL);
+ if (!mes->doorbell_bitmap) {
+ DRM_ERROR("Failed to allocate MES doorbell bitmap\n");
+ return -ENOMEM;
+ }
- /* allocate Qword range for aggregated doorbell */
- for (i = 0; i < AMDGPU_MES_PRIORITY_NUM_LEVELS; i++)
- adev->mes.aggregated_doorbells[i] =
- aggregated_doorbell_start / sizeof(u32) + i * 2;
+ mes->num_mes_dbs = PAGE_SIZE / AMDGPU_ONE_DOORBELL_SIZE;
+ for (i = 0; i < AMDGPU_MES_PRIORITY_NUM_LEVELS; i++) {
+ adev->mes.aggregated_doorbells[i] = mes->db_start_dw_offset + i * 2;
+ set_bit(i, mes->doorbell_bitmap);
+ }
- DRM_INFO("max_doorbell_slices=%zu\n", doorbell_process_limit);
return 0;
}
+static void amdgpu_mes_doorbell_free(struct amdgpu_device *adev)
+{
+ bitmap_free(adev->mes.doorbell_bitmap);
+}
+
int amdgpu_mes_init(struct amdgpu_device *adev)
{
int i, r;
@@ -250,6 +229,7 @@ void amdgpu_mes_fini(struct amdgpu_device *adev)
amdgpu_device_wb_free(adev, adev->mes.sch_ctx_offs);
amdgpu_device_wb_free(adev, adev->mes.query_status_fence_offs);
amdgpu_device_wb_free(adev, adev->mes.read_val_offs);
+ amdgpu_mes_doorbell_free(adev);
idr_destroy(&adev->mes.pasid_idr);
idr_destroy(&adev->mes.gang_id_idr);
@@ -679,7 +659,7 @@ int amdgpu_mes_add_hw_queue(struct amdgpu_device *adev, int gang_id,
*queue_id = queue->queue_id = r;
/* allocate a doorbell index for the queue */
- r = amdgpu_mes_queue_doorbell_get(adev, gang->process,
+ r = amdgpu_mes_kernel_doorbell_get(adev, gang->process,
qprops->queue_type,
&qprops->doorbell_off);
if (r)
@@ -737,7 +717,7 @@ int amdgpu_mes_add_hw_queue(struct amdgpu_device *adev, int gang_id,
return 0;
clean_up_doorbell:
- amdgpu_mes_queue_doorbell_free(adev, gang->process,
+ amdgpu_mes_kernel_doorbell_free(adev, gang->process,
qprops->doorbell_off);
clean_up_queue_id:
spin_lock_irqsave(&adev->mes.queue_id_lock, flags);
@@ -792,7 +772,7 @@ int amdgpu_mes_remove_hw_queue(struct amdgpu_device *adev, int queue_id)
queue_id);
list_del(&queue->list);
- amdgpu_mes_queue_doorbell_free(adev, gang->process,
+ amdgpu_mes_kernel_doorbell_free(adev, gang->process,
queue->doorbell_off);
amdgpu_mes_unlock(&adev->mes);
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_mes.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_mes.h
index a403418d5eac..2c604e04fd5c 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_mes.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_mes.h
@@ -27,6 +27,7 @@
#include "amdgpu_irq.h"
#include "kgd_kfd_interface.h"
#include "amdgpu_gfx.h"
+#include "amdgpu_doorbell.h"
#include <linux/sched/mm.h>
#define AMDGPU_MES_MAX_COMPUTE_PIPES 8
@@ -130,6 +131,8 @@ struct amdgpu_mes {
/* MES doorbells */
uint32_t db_start_dw_offset;
+ uint32_t num_mes_dbs;
+ unsigned long *doorbell_bitmap;
/* ip specific functions */
const struct amdgpu_mes_funcs *funcs;
--
2.40.1
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