提交 03eec93b 编写于 作者: A Alex Deucher 提交者: Christian König

drm/radeon: document non-VM functions in radeon_gart.c (v2)

Document the non-VM functions in radeon_gart.c

v2: adjust per Christian's suggestions
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>
Reviewed-by: NChristian König <christian.koenig@amd.com>
上级 75923280
......@@ -30,9 +30,39 @@
#include "radeon.h"
#include "radeon_reg.h"
/*
* GART
* The GART (Graphics Aperture Remapping Table) is an aperture
* in the GPU's address space. System pages can be mapped into
* the aperture and look like contiguous pages from the GPU's
* perspective. A page table maps the pages in the aperture
* to the actual backing pages in system memory.
*
* Radeon GPUs support both an internal GART, as described above,
* and AGP. AGP works similarly, but the GART table is configured
* and maintained by the northbridge rather than the driver.
* Radeon hw has a separate AGP aperture that is programmed to
* point to the AGP aperture provided by the northbridge and the
* requests are passed through to the northbridge aperture.
* Both AGP and internal GART can be used at the same time, however
* that is not currently supported by the driver.
*
* This file handles the common internal GART management.
*/
/*
* Common GART table functions.
*/
/**
* radeon_gart_table_ram_alloc - allocate system ram for gart page table
*
* @rdev: radeon_device pointer
*
* Allocate system memory for GART page table
* (r1xx-r3xx, non-pcie r4xx, rs400). These asics require the
* gart table to be in system memory.
* Returns 0 for success, -ENOMEM for failure.
*/
int radeon_gart_table_ram_alloc(struct radeon_device *rdev)
{
void *ptr;
......@@ -54,6 +84,15 @@ int radeon_gart_table_ram_alloc(struct radeon_device *rdev)
return 0;
}
/**
* radeon_gart_table_ram_free - free system ram for gart page table
*
* @rdev: radeon_device pointer
*
* Free system memory for GART page table
* (r1xx-r3xx, non-pcie r4xx, rs400). These asics require the
* gart table to be in system memory.
*/
void radeon_gart_table_ram_free(struct radeon_device *rdev)
{
if (rdev->gart.ptr == NULL) {
......@@ -73,6 +112,16 @@ void radeon_gart_table_ram_free(struct radeon_device *rdev)
rdev->gart.table_addr = 0;
}
/**
* radeon_gart_table_vram_alloc - allocate vram for gart page table
*
* @rdev: radeon_device pointer
*
* Allocate video memory for GART page table
* (pcie r4xx, r5xx+). These asics require the
* gart table to be in video memory.
* Returns 0 for success, error for failure.
*/
int radeon_gart_table_vram_alloc(struct radeon_device *rdev)
{
int r;
......@@ -88,6 +137,16 @@ int radeon_gart_table_vram_alloc(struct radeon_device *rdev)
return 0;
}
/**
* radeon_gart_table_vram_pin - pin gart page table in vram
*
* @rdev: radeon_device pointer
*
* Pin the GART page table in vram so it will not be moved
* by the memory manager (pcie r4xx, r5xx+). These asics require the
* gart table to be in video memory.
* Returns 0 for success, error for failure.
*/
int radeon_gart_table_vram_pin(struct radeon_device *rdev)
{
uint64_t gpu_addr;
......@@ -110,6 +169,14 @@ int radeon_gart_table_vram_pin(struct radeon_device *rdev)
return r;
}
/**
* radeon_gart_table_vram_unpin - unpin gart page table in vram
*
* @rdev: radeon_device pointer
*
* Unpin the GART page table in vram (pcie r4xx, r5xx+).
* These asics require the gart table to be in video memory.
*/
void radeon_gart_table_vram_unpin(struct radeon_device *rdev)
{
int r;
......@@ -126,6 +193,15 @@ void radeon_gart_table_vram_unpin(struct radeon_device *rdev)
}
}
/**
* radeon_gart_table_vram_free - free gart page table vram
*
* @rdev: radeon_device pointer
*
* Free the video memory used for the GART page table
* (pcie r4xx, r5xx+). These asics require the gart table to
* be in video memory.
*/
void radeon_gart_table_vram_free(struct radeon_device *rdev)
{
if (rdev->gart.robj == NULL) {
......@@ -135,12 +211,19 @@ void radeon_gart_table_vram_free(struct radeon_device *rdev)
radeon_bo_unref(&rdev->gart.robj);
}
/*
* Common gart functions.
*/
/**
* radeon_gart_unbind - unbind pages from the gart page table
*
* @rdev: radeon_device pointer
* @offset: offset into the GPU's gart aperture
* @pages: number of pages to unbind
*
* Unbinds the requested pages from the gart page table and
* replaces them with the dummy page (all asics).
*/
void radeon_gart_unbind(struct radeon_device *rdev, unsigned offset,
int pages)
{
......@@ -172,6 +255,19 @@ void radeon_gart_unbind(struct radeon_device *rdev, unsigned offset,
radeon_gart_tlb_flush(rdev);
}
/**
* radeon_gart_bind - bind pages into the gart page table
*
* @rdev: radeon_device pointer
* @offset: offset into the GPU's gart aperture
* @pages: number of pages to bind
* @pagelist: pages to bind
* @dma_addr: DMA addresses of pages
*
* Binds the requested pages to the gart page table
* (all asics).
* Returns 0 for success, -EINVAL for failure.
*/
int radeon_gart_bind(struct radeon_device *rdev, unsigned offset,
int pages, struct page **pagelist, dma_addr_t *dma_addr)
{
......@@ -203,6 +299,14 @@ int radeon_gart_bind(struct radeon_device *rdev, unsigned offset,
return 0;
}
/**
* radeon_gart_restore - bind all pages in the gart page table
*
* @rdev: radeon_device pointer
*
* Binds all pages in the gart page table (all asics).
* Used to rebuild the gart table on device startup or resume.
*/
void radeon_gart_restore(struct radeon_device *rdev)
{
int i, j, t;
......@@ -222,6 +326,14 @@ void radeon_gart_restore(struct radeon_device *rdev)
radeon_gart_tlb_flush(rdev);
}
/**
* radeon_gart_init - init the driver info for managing the gart
*
* @rdev: radeon_device pointer
*
* Allocate the dummy page and init the gart driver info (all asics).
* Returns 0 for success, error for failure.
*/
int radeon_gart_init(struct radeon_device *rdev)
{
int r, i;
......@@ -262,6 +374,13 @@ int radeon_gart_init(struct radeon_device *rdev)
return 0;
}
/**
* radeon_gart_fini - tear down the driver info for managing the gart
*
* @rdev: radeon_device pointer
*
* Tear down the gart driver info and free the dummy page (all asics).
*/
void radeon_gart_fini(struct radeon_device *rdev)
{
if (rdev->gart.pages && rdev->gart.pages_addr && rdev->gart.ready) {
......
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