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Date: Wed, 26 Mar 2008 10:16:33 -0300
From: Glauber Costa <gcosta@...hat.com>
To: Ingo Molnar <mingo@...e.hu>
CC: linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
glommer@...il.com, tglx@...utronix.de,
kvm-devel@...ts.sourceforge.net, avi@...ranet.com,
amit.shah@...ranet.com
Subject: Re: [PATCH 0/20] dma_ops for i386
Ingo Molnar wrote:
> * Ingo Molnar <mingo@...e.hu> wrote:
>
>> what i came up is the prototype 32-bit fix below - this works on
>> 32-bit but breaks 64-bit because we pass in physical addresses instead
>> of virtual direct addresses.
>>
>> i'll fix the 64-bit side but that means materially touching all the
>> dma_mapping_ops instantiations materially on the 64-bit side - not
>> really something we wanted to do :-/
>
> the full fix ended up being the one below. It's not that bad - and
> gart_64.c looks even a bit cleaner. Still, it needs careful review.
>
> Ingo
>
> --------------->
> Subject: x86: dma-ops on highmem fix
> From: Ingo Molnar <mingo@...e.hu>
>
> Signed-off-by: Ingo Molnar <mingo@...e.hu>
> ---
> arch/x86/kernel/pci-base_32.c | 4 ++--
> arch/x86/kernel/pci-calgary_64.c | 3 ++-
> arch/x86/kernel/pci-dma_64.c | 2 +-
> arch/x86/kernel/pci-gart_64.c | 15 +++++++--------
> arch/x86/kernel/pci-nommu_64.c | 4 ++--
> arch/x86/kernel/pci-swiotlb_64.c | 9 ++++++++-
> include/asm-x86/dma-mapping.h | 10 ++++++----
> 7 files changed, 28 insertions(+), 19 deletions(-)
>
> Index: linux-x86.q/arch/x86/kernel/pci-base_32.c
> ===================================================================
> --- linux-x86.q.orig/arch/x86/kernel/pci-base_32.c
> +++ linux-x86.q/arch/x86/kernel/pci-base_32.c
> @@ -4,12 +4,12 @@
> #include <linux/dma-mapping.h>
> #include <asm/dma-mapping.h>
>
> -static dma_addr_t pci32_map_single(struct device *dev, void *ptr,
> +static dma_addr_t pci32_map_single(struct device *dev, phys_addr_t ptr,
> size_t size, int direction)
> {
> WARN_ON(size == 0);
> flush_write_buffers();
> - return virt_to_phys(ptr);
> + return ptr;
> }
>
> static int pci32_dma_map_sg(struct device *dev, struct scatterlist *sglist,
> Index: linux-x86.q/arch/x86/kernel/pci-calgary_64.c
> ===================================================================
> --- linux-x86.q.orig/arch/x86/kernel/pci-calgary_64.c
> +++ linux-x86.q/arch/x86/kernel/pci-calgary_64.c
> @@ -470,10 +470,11 @@ error:
> return 0;
> }
>
> -static dma_addr_t calgary_map_single(struct device *dev, void *vaddr,
> +static dma_addr_t calgary_map_single(struct device *dev, phys_addr_t paddr,
> size_t size, int direction)
> {
> dma_addr_t dma_handle = bad_dma_address;
> + void *vaddr = phys_to_virt(paddr);
> unsigned long uaddr;
> unsigned int npages;
> struct iommu_table *tbl = find_iommu_table(dev);
> Index: linux-x86.q/arch/x86/kernel/pci-dma_64.c
> ===================================================================
> --- linux-x86.q.orig/arch/x86/kernel/pci-dma_64.c
> +++ linux-x86.q/arch/x86/kernel/pci-dma_64.c
> @@ -141,7 +141,7 @@ dma_alloc_coherent(struct device *dev, s
> }
>
> if (dma_ops->map_simple) {
> - *dma_handle = dma_ops->map_simple(dev, memory,
> + *dma_handle = dma_ops->map_simple(dev, virt_to_phys(memory),
> size,
> PCI_DMA_BIDIRECTIONAL);
> if (*dma_handle != bad_dma_address)
> Index: linux-x86.q/arch/x86/kernel/pci-gart_64.c
> ===================================================================
> --- linux-x86.q.orig/arch/x86/kernel/pci-gart_64.c
> +++ linux-x86.q/arch/x86/kernel/pci-gart_64.c
> @@ -264,9 +264,9 @@ static dma_addr_t dma_map_area(struct de
> }
>
> static dma_addr_t
> -gart_map_simple(struct device *dev, char *buf, size_t size, int dir)
> +gart_map_simple(struct device *dev, phys_addr_t paddr, size_t size, int dir)
> {
> - dma_addr_t map = dma_map_area(dev, virt_to_bus(buf), size, dir);
> + dma_addr_t map = dma_map_area(dev, paddr, size, dir);
>
> flush_gart();
>
> @@ -275,18 +275,17 @@ gart_map_simple(struct device *dev, char
>
> /* Map a single area into the IOMMU */
> static dma_addr_t
> -gart_map_single(struct device *dev, void *addr, size_t size, int dir)
> +gart_map_single(struct device *dev, phys_addr_t paddr, size_t size, int dir)
> {
> - unsigned long phys_mem, bus;
> + unsigned long bus;
>
> if (!dev)
> dev = &fallback_dev;
>
> - phys_mem = virt_to_phys(addr);
> - if (!need_iommu(dev, phys_mem, size))
> - return phys_mem;
> + if (!need_iommu(dev, paddr, size))
> + return paddr;
>
> - bus = gart_map_simple(dev, addr, size, dir);
> + bus = gart_map_simple(dev, paddr, size, dir);
>
> return bus;
> }
> Index: linux-x86.q/arch/x86/kernel/pci-nommu_64.c
> ===================================================================
> --- linux-x86.q.orig/arch/x86/kernel/pci-nommu_64.c
> +++ linux-x86.q/arch/x86/kernel/pci-nommu_64.c
> @@ -26,10 +26,10 @@ check_addr(char *name, struct device *hw
> }
>
> static dma_addr_t
> -nommu_map_single(struct device *hwdev, void *ptr, size_t size,
> +nommu_map_single(struct device *hwdev, phys_addr_t paddr, size_t size,
> int direction)
> {
> - dma_addr_t bus = virt_to_bus(ptr);
> + dma_addr_t bus = paddr;
> if (!check_addr("map_single", hwdev, bus, size))
> return bad_dma_address;
> return bus;
> Index: linux-x86.q/arch/x86/kernel/pci-swiotlb_64.c
> ===================================================================
> --- linux-x86.q.orig/arch/x86/kernel/pci-swiotlb_64.c
> +++ linux-x86.q/arch/x86/kernel/pci-swiotlb_64.c
> @@ -11,11 +11,18 @@
>
> int swiotlb __read_mostly;
>
> +static dma_addr_t
> +swiotlb_map_single_phys(struct device *hwdev, phys_addr_t paddr, size_t size,
> + int direction)
> +{
> + return swiotlb_map_single(hwdev, phys_to_virt(paddr), size, direction);
> +}
> +
> const struct dma_mapping_ops swiotlb_dma_ops = {
> .mapping_error = swiotlb_dma_mapping_error,
> .alloc_coherent = swiotlb_alloc_coherent,
> .free_coherent = swiotlb_free_coherent,
> - .map_single = swiotlb_map_single,
> + .map_single = swiotlb_map_single_phys,
> .unmap_single = swiotlb_unmap_single,
> .sync_single_for_cpu = swiotlb_sync_single_for_cpu,
> .sync_single_for_device = swiotlb_sync_single_for_device,
> Index: linux-x86.q/include/asm-x86/dma-mapping.h
> ===================================================================
> --- linux-x86.q.orig/include/asm-x86/dma-mapping.h
> +++ linux-x86.q/include/asm-x86/dma-mapping.h
> @@ -16,10 +16,10 @@ struct dma_mapping_ops {
> dma_addr_t *dma_handle, gfp_t gfp);
> void (*free_coherent)(struct device *dev, size_t size,
> void *vaddr, dma_addr_t dma_handle);
> - dma_addr_t (*map_single)(struct device *hwdev, void *ptr,
> + dma_addr_t (*map_single)(struct device *hwdev, phys_addr_t ptr,
> size_t size, int direction);
> /* like map_single, but doesn't check the device mask */
> - dma_addr_t (*map_simple)(struct device *hwdev, char *ptr,
> + dma_addr_t (*map_simple)(struct device *hwdev, phys_addr_t ptr,
> size_t size, int direction);
> void (*unmap_single)(struct device *dev, dma_addr_t addr,
> size_t size, int direction);
> @@ -73,7 +73,7 @@ dma_map_single(struct device *hwdev, voi
> int direction)
> {
> BUG_ON(!valid_dma_direction(direction));
> - return dma_ops->map_single(hwdev, ptr, size, direction);
> + return dma_ops->map_single(hwdev, virt_to_phys(ptr), size, direction);
> }
>
> static inline void
> @@ -174,7 +174,9 @@ static inline dma_addr_t dma_map_page(st
> size_t offset, size_t size,
> int direction)
> {
> - return dma_map_single(dev, page_address(page)+offset, size, direction);
> + BUG_ON(!valid_dma_direction(direction));
> + return dma_ops->map_single(dev, page_to_phys(page)+offset,
> + size, direction);
> }
>
> static inline void dma_unmap_page(struct device *dev, dma_addr_t addr,
It looks all good to me.
I'll give a shot in my systems to see if it goes okay.
--
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