gpu: ion: Delay unmapping from IOMMU.
Due to limitations in the multimedia architecure
clients might not know when a buffer can be unmapped
from the IOMMU. In addition, the multimedia architecture
causes unnecessary mappings/unmappings for the same buffers
which reduces framerates.
Add logic to delay unmapping from the IOMMU
until buffer memory is freed and unmap any outstanding
mappings to avoid virtual memory address space leak.
Change-Id: Idaeae269d9ba623e25a0cb087a89b4cbb63915af
Signed-off-by: Olav Haugan <ohaugan@codeaurora.org>
diff --git a/drivers/gpu/ion/ion_priv.h b/drivers/gpu/ion/ion_priv.h
index 36758fa..98e11cf 100644
--- a/drivers/gpu/ion/ion_priv.h
+++ b/drivers/gpu/ion/ion_priv.h
@@ -37,6 +37,12 @@
void *vaddr;
};
+enum {
+ DI_PARTITION_NUM = 0,
+ DI_DOMAIN_NUM = 1,
+ DI_MAX,
+};
+
/**
* struct ion_iommu_map - represents a mapping of an ion buffer to an iommu
* @iova_addr - iommu virtual address
@@ -47,6 +53,7 @@
* @ref - for reference counting this mapping
* @mapped_size - size of the iova space mapped
* (may not be the same as the buffer size)
+ * @flags - iommu domain/partition specific flags.
*
* Represents a mapping of one ion buffer to a particular iommu domain
* and address range. There may exist other mappings of this buffer in
@@ -57,12 +64,13 @@
unsigned long iova_addr;
struct rb_node node;
union {
- int domain_info[2];
+ int domain_info[DI_MAX];
uint64_t key;
};
struct ion_buffer *buffer;
struct kref ref;
int mapped_size;
+ unsigned long flags;
};
struct ion_buffer *ion_handle_buffer(struct ion_handle *handle);