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path: root/drivers/gpu/drm/amd/amdkfd/kfd_doorbell.c
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Diffstat (limited to 'drivers/gpu/drm/amd/amdkfd/kfd_doorbell.c')
-rw-r--r--drivers/gpu/drm/amd/amdkfd/kfd_doorbell.c50
1 files changed, 34 insertions, 16 deletions
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_doorbell.c b/drivers/gpu/drm/amd/amdkfd/kfd_doorbell.c
index acf4d2a977ad..feb76c235b1a 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_doorbell.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_doorbell.c
@@ -24,16 +24,15 @@
#include <linux/mman.h>
#include <linux/slab.h>
#include <linux/io.h>
+#include <linux/idr.h>
/*
- * This extension supports a kernel level doorbells management for
- * the kernel queues.
- * Basically the last doorbells page is devoted to kernel queues
- * and that's assures that any user process won't get access to the
- * kernel doorbells page
+ * This extension supports a kernel level doorbells management for the
+ * kernel queues using the first doorbell page reserved for the kernel.
*/
-#define KERNEL_DOORBELL_PASID 1
+static DEFINE_IDA(doorbell_ida);
+static unsigned int max_doorbell_slices;
#define KFD_SIZE_OF_DOORBELL_IN_BYTES 4
/*
@@ -84,13 +83,16 @@ int kfd_doorbell_init(struct kfd_dev *kfd)
(doorbell_aperture_size - doorbell_start_offset) /
doorbell_process_allocation();
else
- doorbell_process_limit = 0;
+ return -ENOSPC;
+
+ if (!max_doorbell_slices ||
+ doorbell_process_limit < max_doorbell_slices)
+ max_doorbell_slices = doorbell_process_limit;
kfd->doorbell_base = kfd->shared_resources.doorbell_physical_address +
doorbell_start_offset;
kfd->doorbell_id_offset = doorbell_start_offset / sizeof(u32);
- kfd->doorbell_process_limit = doorbell_process_limit - 1;
kfd->doorbell_kernel_ptr = ioremap(kfd->doorbell_base,
doorbell_process_allocation());
@@ -185,11 +187,10 @@ u32 __iomem *kfd_get_kernel_doorbell(struct kfd_dev *kfd,
return NULL;
/*
- * Calculating the kernel doorbell offset using "faked" kernel
- * pasid that allocated for kernel queues only
+ * Calculating the kernel doorbell offset using the first
+ * doorbell page.
*/
- *doorbell_off = KERNEL_DOORBELL_PASID * (doorbell_process_allocation() /
- sizeof(u32)) + inx;
+ *doorbell_off = kfd->doorbell_id_offset + inx;
pr_debug("Get kernel queue doorbell\n"
" doorbell offset == 0x%08X\n"
@@ -228,11 +229,12 @@ unsigned int kfd_queue_id_to_doorbell(struct kfd_dev *kfd,
{
/*
* doorbell_id_offset accounts for doorbells taken by KGD.
- * pasid * doorbell_process_allocation/sizeof(u32) adjusts
- * to the process's doorbells
+ * index * doorbell_process_allocation/sizeof(u32) adjusts to
+ * the process's doorbells.
*/
return kfd->doorbell_id_offset +
- process->pasid * (doorbell_process_allocation()/sizeof(u32)) +
+ process->doorbell_index
+ * doorbell_process_allocation() / sizeof(u32) +
queue_id;
}
@@ -250,5 +252,21 @@ phys_addr_t kfd_get_process_doorbells(struct kfd_dev *dev,
struct kfd_process *process)
{
return dev->doorbell_base +
- process->pasid * doorbell_process_allocation();
+ process->doorbell_index * doorbell_process_allocation();
+}
+
+int kfd_alloc_process_doorbells(struct kfd_process *process)
+{
+ int r = ida_simple_get(&doorbell_ida, 1, max_doorbell_slices,
+ GFP_KERNEL);
+ if (r > 0)
+ process->doorbell_index = r;
+
+ return r;
+}
+
+void kfd_free_process_doorbells(struct kfd_process *process)
+{
+ if (process->doorbell_index)
+ ida_simple_remove(&doorbell_ida, process->doorbell_index);
}