drm/radeon: document non-VM functions in radeon_gart.c (v2) (03eec93b) · Commits · e / devices / android_kernel_teracube_2e

drivers/gpu/drm/radeon/radeon_gart.c

+122 −3

Original line number	Diff line number	Diff line
		@@ -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) {