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Diffstat (limited to 'drivers/gpu/drm/etnaviv/etnaviv_cmdbuf.c')
-rw-r--r--drivers/gpu/drm/etnaviv/etnaviv_cmdbuf.c142
1 files changed, 142 insertions, 0 deletions
diff --git a/drivers/gpu/drm/etnaviv/etnaviv_cmdbuf.c b/drivers/gpu/drm/etnaviv/etnaviv_cmdbuf.c
new file mode 100644
index 000000000..9dc20d892
--- /dev/null
+++ b/drivers/gpu/drm/etnaviv/etnaviv_cmdbuf.c
@@ -0,0 +1,142 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2017-2018 Etnaviv Project
+ */
+
+#include <linux/dma-mapping.h>
+
+#include <drm/drm_mm.h>
+
+#include "etnaviv_cmdbuf.h"
+#include "etnaviv_gem.h"
+#include "etnaviv_gpu.h"
+#include "etnaviv_mmu.h"
+#include "etnaviv_perfmon.h"
+
+#define SUBALLOC_SIZE SZ_512K
+#define SUBALLOC_GRANULE SZ_4K
+#define SUBALLOC_GRANULES (SUBALLOC_SIZE / SUBALLOC_GRANULE)
+
+struct etnaviv_cmdbuf_suballoc {
+ /* suballocated dma buffer properties */
+ struct device *dev;
+ void *vaddr;
+ dma_addr_t paddr;
+
+ /* allocation management */
+ struct mutex lock;
+ DECLARE_BITMAP(granule_map, SUBALLOC_GRANULES);
+ int free_space;
+ wait_queue_head_t free_event;
+};
+
+struct etnaviv_cmdbuf_suballoc *
+etnaviv_cmdbuf_suballoc_new(struct device *dev)
+{
+ struct etnaviv_cmdbuf_suballoc *suballoc;
+ int ret;
+
+ suballoc = kzalloc(sizeof(*suballoc), GFP_KERNEL);
+ if (!suballoc)
+ return ERR_PTR(-ENOMEM);
+
+ suballoc->dev = dev;
+ mutex_init(&suballoc->lock);
+ init_waitqueue_head(&suballoc->free_event);
+
+ BUILD_BUG_ON(ETNAVIV_SOFTPIN_START_ADDRESS < SUBALLOC_SIZE);
+ suballoc->vaddr = dma_alloc_wc(dev, SUBALLOC_SIZE,
+ &suballoc->paddr, GFP_KERNEL);
+ if (!suballoc->vaddr) {
+ ret = -ENOMEM;
+ goto free_suballoc;
+ }
+
+ return suballoc;
+
+free_suballoc:
+ kfree(suballoc);
+
+ return ERR_PTR(ret);
+}
+
+int etnaviv_cmdbuf_suballoc_map(struct etnaviv_cmdbuf_suballoc *suballoc,
+ struct etnaviv_iommu_context *context,
+ struct etnaviv_vram_mapping *mapping,
+ u32 memory_base)
+{
+ return etnaviv_iommu_get_suballoc_va(context, mapping, memory_base,
+ suballoc->paddr, SUBALLOC_SIZE);
+}
+
+void etnaviv_cmdbuf_suballoc_unmap(struct etnaviv_iommu_context *context,
+ struct etnaviv_vram_mapping *mapping)
+{
+ etnaviv_iommu_put_suballoc_va(context, mapping);
+}
+
+void etnaviv_cmdbuf_suballoc_destroy(struct etnaviv_cmdbuf_suballoc *suballoc)
+{
+ dma_free_wc(suballoc->dev, SUBALLOC_SIZE, suballoc->vaddr,
+ suballoc->paddr);
+ kfree(suballoc);
+}
+
+int etnaviv_cmdbuf_init(struct etnaviv_cmdbuf_suballoc *suballoc,
+ struct etnaviv_cmdbuf *cmdbuf, u32 size)
+{
+ int granule_offs, order, ret;
+
+ cmdbuf->suballoc = suballoc;
+ cmdbuf->size = size;
+
+ order = order_base_2(ALIGN(size, SUBALLOC_GRANULE) / SUBALLOC_GRANULE);
+retry:
+ mutex_lock(&suballoc->lock);
+ granule_offs = bitmap_find_free_region(suballoc->granule_map,
+ SUBALLOC_GRANULES, order);
+ if (granule_offs < 0) {
+ suballoc->free_space = 0;
+ mutex_unlock(&suballoc->lock);
+ ret = wait_event_interruptible_timeout(suballoc->free_event,
+ suballoc->free_space,
+ msecs_to_jiffies(10 * 1000));
+ if (!ret) {
+ dev_err(suballoc->dev,
+ "Timeout waiting for cmdbuf space\n");
+ return -ETIMEDOUT;
+ }
+ goto retry;
+ }
+ mutex_unlock(&suballoc->lock);
+ cmdbuf->suballoc_offset = granule_offs * SUBALLOC_GRANULE;
+ cmdbuf->vaddr = suballoc->vaddr + cmdbuf->suballoc_offset;
+
+ return 0;
+}
+
+void etnaviv_cmdbuf_free(struct etnaviv_cmdbuf *cmdbuf)
+{
+ struct etnaviv_cmdbuf_suballoc *suballoc = cmdbuf->suballoc;
+ int order = order_base_2(ALIGN(cmdbuf->size, SUBALLOC_GRANULE) /
+ SUBALLOC_GRANULE);
+
+ mutex_lock(&suballoc->lock);
+ bitmap_release_region(suballoc->granule_map,
+ cmdbuf->suballoc_offset / SUBALLOC_GRANULE,
+ order);
+ suballoc->free_space = 1;
+ mutex_unlock(&suballoc->lock);
+ wake_up_all(&suballoc->free_event);
+}
+
+u32 etnaviv_cmdbuf_get_va(struct etnaviv_cmdbuf *buf,
+ struct etnaviv_vram_mapping *mapping)
+{
+ return mapping->iova + buf->suballoc_offset;
+}
+
+dma_addr_t etnaviv_cmdbuf_get_pa(struct etnaviv_cmdbuf *buf)
+{
+ return buf->suballoc->paddr + buf->suballoc_offset;
+}