On Mon, Nov 12, 2018 at 10:44:02AM -0500, Tony Battersby wrote:
> Rename fields in 'struct dma_page' in preparation for moving them into
> 'struct page'. No functional changes.
>
> in_use -> dma_in_use
> offset -> dma_free_off
>
> Signed-off-by: Tony Battersby
Acked-by: Matthew Wilcox
On Mon, Nov 12, 2018 at 10:43:25AM -0500, Tony Battersby wrote:
> dma_pool_alloc() scales poorly when allocating a large number of pages
> because it does a linear scan of all previously-allocated pages before
> allocating a new one. Improve its scalability by maintaining a separate
> list of
On Thu, Nov 8, 2018 at 11:49 PM, Christoph Hellwig wrote:
> On Tue, Nov 06, 2018 at 05:27:14PM -0800, John Stultz wrote:
>> But at that point if I just re-apply "swiotlb: use swiotlb_map_page in
>> swiotlb_map_sg_attrs", I reproduce the hangs.
>>
>> Any suggestions for how to further debug what
On Mon, Nov 12, 2018 at 4:07 PM, John Stultz wrote:
> On Thu, Nov 8, 2018 at 11:49 PM, Christoph Hellwig wrote:
>> On Tue, Nov 06, 2018 at 05:27:14PM -0800, John Stultz wrote:
>>> But at that point if I just re-apply "swiotlb: use swiotlb_map_page in
>>> swiotlb_map_sg_attrs", I reproduce the
On Mon, Nov 12, 2018 at 10:41:34AM -0500, Tony Battersby wrote:
> Fixes: e34f44b3517f ("pool: Improve memory usage for devices which can't
> cross boundaries")
> Signed-off-by: Tony Battersby
Acked-by: Matthew Wilcox
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iommu mailing list
On Mon, Nov 12, 2018 at 10:42:12AM -0500, Tony Battersby wrote:
> dmapool originally tried to support pools without a device because
> dma_alloc_coherent() supports allocations without a device. But nobody
> ended up using dma pools without a device, so the current checks in
> dmapool.c for
On Mon, Nov 12, 2018 at 10:42:48AM -0500, Tony Battersby wrote:
> Remove a small amount of code duplication between dma_pool_destroy() and
> pool_free_page() in preparation for adding more code without having to
> duplicate it. No functional changes.
>
> Signed-off-by: Tony Battersby
Acked-by:
On Mon, Nov 12, 2018 at 10:44:40AM -0500, Tony Battersby wrote:
> dma_pool_free() scales poorly when the pool contains many pages because
> pool_find_page() does a linear scan of all allocated pages. Improve its
> scalability by replacing the linear scan with virt_to_page() and storing
> dmapool
Hey Jacob,
> On 9 Nov 2018, at 19:09, Jacob Pan wrote:
>
> On Thu, 8 Nov 2018 11:30:04 +
> James Sewart mailto:jamessew...@arista.com>> wrote:
>
>> Hey,
>>
>>> On 8 Nov 2018, at 01:42, Lu Baolu wrote:
>>>
>>> Hi,
>>>
>>> On 11/8/18 1:55 AM, James Sewart wrote:
Hey,
> On 7
On Mon, Nov 12, 2018 at 10:40:57AM -0500, Tony Battersby wrote:
> I posted v3 on August 7. Nobody acked or merged the patches, and then
> I got too busy with other stuff to repost until now.
Thanks for resending. They were in my pile of things to look at, but
that's an ever-growing pile.
> I
On Mon, Nov 12, 2018 at 10:46:35AM -0500, Tony Battersby wrote:
> Prevent a possible endless loop with DMAPOOL_DEBUG enabled if a buggy
> driver corrupts DMA pool memory.
>
> Signed-off-by: Tony Battersby
I like it! Also, here you're using blks_per_alloc in a way which isn't
normally in the
On Mon, Nov 12, 2018 at 10:45:21AM -0500, Tony Battersby wrote:
> To represent the size of a single allocation, dmapool currently uses
> 'unsigned int' in some places and 'size_t' in other places. Standardize
> on 'unsigned int' to reduce overhead, but use 'size_t' when counting all
> the blocks
On Fri, Nov 09, 2018 at 01:01:55PM -0500, Rob Clark wrote:
> On Mon, Oct 29, 2018 at 3:09 PM Will Deacon wrote:
> > On Thu, Sep 27, 2018 at 06:46:07PM -0400, Rob Clark wrote:
> > > We seem to need to set either this or CFCFG (stall), otherwise gpu
> > > faults trigger problems with other
On Mon, Nov 12, 2018 at 12:26:30PM +, Suthikulpanit, Suravee wrote:
> From: Filippo Sironi
>
> This register should have been programmed with the physical address
> of the memory location containing the shadow tail pointer for
> the guest virtual APIC log instead of the base address.
>
>
On 11/12/2018 02:13 PM, Hans Verkuil wrote:
> On 11/12/2018 03:41 AM, Anshuman Khandual wrote:
>> At present there are multiple places where invalid node number is encoded
>> as -1. Even though implicitly understood it is always better to have macros
>> in there. Replace these open encodings
From: Filippo Sironi
This register should have been programmed with the physical address
of the memory location containing the shadow tail pointer for
the guest virtual APIC log instead of the base address.
Fixes: 8bda0cfbdc1a ('iommu/amd: Detect and initialize guest vAPIC log')
Signed-off-by:
On Mon, Nov 12, 2018 at 02:40:08PM +0800, Lu Baolu wrote:
> arch/x86/kernel/tboot.c| 2 +-
> drivers/gpu/drm/i915/i915_gem_execbuffer.c | 2 +-
> drivers/gpu/drm/i915/intel_display.c | 2 +-
> drivers/gpu/drm/vmwgfx/vmwgfx_drv.c| 2 +-
>
On Mon, Nov 12, 2018 at 10:45:58AM -0500, Tony Battersby wrote:
> +++ linux/mm/dmapool.c2018-08-06 17:52:53.0 -0400
> @@ -61,6 +61,7 @@ struct dma_pool { /* the pool */
> struct device *dev;
> unsigned int allocation;
> unsigned int boundary;
> +
Hi Jean-Philippe,
On Fri, Oct 19, 2018 at 07:11:54PM +0100, Jean-Philippe Brucker wrote:
> The allocator doesn't really belong in drivers/iommu because some
> drivers would like to allocate PASIDs for devices that aren't managed by
> an IOMMU, using the same ID space as IOMMU. It doesn't really
Hi Jean-Philippe,
On Thu, Nov 08, 2018 at 06:29:42PM +, Jean-Philippe Brucker wrote:
> (1) My initial approach would have been to use the same page tables for
> the default_domain and this new domain, but it might be precisely what
> you were trying to avoid with this new proposal: a device
Prevent a possible endless loop with DMAPOOL_DEBUG enabled if a buggy
driver corrupts DMA pool memory.
Signed-off-by: Tony Battersby
---
--- linux/mm/dmapool.c.orig 2018-08-06 17:52:53.0 -0400
+++ linux/mm/dmapool.c 2018-08-06 17:53:31.0 -0400
@@ -454,17 +454,39 @@ void
The "total number of blocks in pool" debug statistic currently does not
take the boundary value into account, so it diverges from the "total
number of blocks in use" statistic when a boundary is in effect. Add a
calculation for the number of blocks per allocation that takes the
boundary into
dma_pool_alloc() scales poorly when allocating a large number of pages
because it does a linear scan of all previously-allocated pages before
allocating a new one. Improve its scalability by maintaining a separate
list of pages that have free blocks ready to (re)allocate. In big O
notation, this
dma_pool_free() scales poorly when the pool contains many pages because
pool_find_page() does a linear scan of all allocated pages. Improve its
scalability by replacing the linear scan with virt_to_page() and storing
dmapool private data directly in 'struct page', thereby eliminating
'struct
To represent the size of a single allocation, dmapool currently uses
'unsigned int' in some places and 'size_t' in other places. Standardize
on 'unsigned int' to reduce overhead, but use 'size_t' when counting all
the blocks in the entire pool.
Signed-off-by: Tony Battersby
---
This puts an
Rename fields in 'struct dma_page' in preparation for moving them into
'struct page'. No functional changes.
in_use -> dma_in_use
offset -> dma_free_off
Signed-off-by: Tony Battersby
---
--- linux/mm/dmapool.c.orig 2018-08-03 17:46:13.0 -0400
+++ linux/mm/dmapool.c 2018-08-03
Recent systems shipping Windows 10 version 1803 or later may support
IOMMU based DMA protection. This means that the platform utilizes IOMMU
to prevent DMA attacks over externally exposed PCIe root ports
(typically Thunderbolt ports)
The system BIOS marks these PCIe root ports as being externally
Hi all,
Recent systems shipping with Windows 10 version 1803 or newer may be
utilizing IOMMU to prevent DMA attacks via Thunderbolt ports. This is
different from the previous security level based scheme because the
connected device cannot access system memory outside of the regions
allocated for
Currently Linux automatically enables ATS (Address Translation Service)
for any device that supports it (and IOMMU is turned on). ATS is used to
accelerate DMA access as the device can cache translations locally so
there is no need to do full translation on IOMMU side. However, as
pointed out in
Recent systems shipping with Windows 10 version 1803 or later may
support a feature called Kernel DMA protection [1]. In practice this
means that Thunderbolt connected devices are placed behind an IOMMU
during the whole time it is connected (including during boot) making
Thunderbolt security
From: Lu Baolu
Intel VT-d spec added a new DMA_CTRL_PLATFORM_OPT_IN_FLAG flag
in DMAR ACPI table for BIOS to report compliance about platform
initiated DMA restricted to RMRR ranges when transferring control
to the OS. The OS treats this as a hint that the IOMMU should be
enabled to prevent DMA
dmapool originally tried to support pools without a device because
dma_alloc_coherent() supports allocations without a device. But nobody
ended up using dma pools without a device, so the current checks in
dmapool.c for pool->dev == NULL are both insufficient and causing bloat.
Remove them.
I posted v3 on August 7. Nobody acked or merged the patches, and then
I got too busy with other stuff to repost until now.
The only change since v3:
*) Dropped patch #10 (the mpt3sas patch) since the mpt3sas maintainers
didn't show any interest.
I believe these patches are ready for merging.
Fix the boundary comparison when constructing the list of free blocks
for the case that 'size' is a power of two. Since 'boundary' is also a
power of two, that would make 'boundary' a multiple of 'size', in which
case a single block would never cross the boundary. This bug would
cause some of
Remove a small amount of code duplication between dma_pool_destroy() and
pool_free_page() in preparation for adding more code without having to
duplicate it. No functional changes.
Signed-off-by: Tony Battersby
---
--- linux/mm/dmapool.c.orig 2018-08-02 09:59:15.0 -0400
+++
On Mon, Nov 12, 2018 at 07:06:24PM +0300, Mika Westerberg wrote:
> Recent systems shipping with Windows 10 version 1803 or newer may be
> utilizing IOMMU to prevent DMA attacks via Thunderbolt ports. This is
> different from the previous security level based scheme because the
> connected device
On Mon, Nov 12, 2018 at 8:12 PM Lukas Wunner wrote:
>
> On Mon, Nov 12, 2018 at 07:06:24PM +0300, Mika Westerberg wrote:
> > Recent systems shipping with Windows 10 version 1803 or newer may be
> > utilizing IOMMU to prevent DMA attacks via Thunderbolt ports. This is
> > different from the
On Mon, Nov 12, 2018 at 11:09:00AM -0700, Alex Williamson wrote:
> On Mon, 12 Nov 2018 19:06:26 +0300
> Mika Westerberg wrote:
>
> > From: Lu Baolu
> >
> > Intel VT-d spec added a new DMA_CTRL_PLATFORM_OPT_IN_FLAG flag
> > in DMAR ACPI table for BIOS to report compliance about platform
> >
On 11/12/2018 03:41 AM, Anshuman Khandual wrote:
> At present there are multiple places where invalid node number is encoded
> as -1. Even though implicitly understood it is always better to have macros
> in there. Replace these open encodings for an invalid node number with the
> global macro
On Mon, Nov 12, 2018 at 6:06 PM Mika Westerberg
wrote:
>
> Recent systems shipping with Windows 10 version 1803 or later may
> support a feature called Kernel DMA protection [1]. In practice this
> means that Thunderbolt connected devices are placed behind an IOMMU
> during the whole time it is
On Mon, Nov 12, 2018 at 07:06:25PM +0300, Mika Westerberg wrote:
> --- a/drivers/pci/probe.c
> +++ b/drivers/pci/probe.c
> @@ -1378,6 +1378,27 @@ static void set_pcie_thunderbolt(struct pci_dev *dev)
> }
> }
>
> +static void set_pcie_external(struct pci_dev *dev)
> +{
> + struct
On Mon, Nov 12, 2018 at 07:06:27PM +0300, Mika Westerberg wrote:
> Currently Linux automatically enables ATS (Address Translation Service)
> for any device that supports it (and IOMMU is turned on). ATS is used to
> accelerate DMA access as the device can cache translations locally so
> there is
On 12/11/2018 15:42, Tony Battersby wrote:
dmapool originally tried to support pools without a device because
dma_alloc_coherent() supports allocations without a device. But nobody
ended up using dma pools without a device, so the current checks in
dmapool.c for pool->dev == NULL are both
On Mon, Nov 12, 2018 at 07:06:26PM +0300, Mika Westerberg wrote:
> From: Lu Baolu
>
> Intel VT-d spec added a new DMA_CTRL_PLATFORM_OPT_IN_FLAG flag
> in DMAR ACPI table for BIOS to report compliance about platform
> initiated DMA restricted to RMRR ranges when transferring control
> to the OS.
On Mon, 12 Nov 2018 19:06:26 +0300
Mika Westerberg wrote:
> From: Lu Baolu
>
> Intel VT-d spec added a new DMA_CTRL_PLATFORM_OPT_IN_FLAG flag
> in DMAR ACPI table for BIOS to report compliance about platform
> initiated DMA restricted to RMRR ranges when transferring control
> to the OS. The
> -Original Message-
> From: Mika Westerberg
> Sent: Monday, November 12, 2018 10:06 AM
> To: iommu@lists.linux-foundation.org
> Cc: Joerg Roedel; David Woodhouse; Lu Baolu; Ashok Raj; Bjorn Helgaas; Rafael
> J.
> Wysocki; Jacob jun Pan; Andreas Noever; Michael Jamet; Yehezkel Bernat;
On 11/12/18 11:32 AM, John Garry wrote:
> On 12/11/2018 15:42, Tony Battersby wrote:
>> dmapool originally tried to support pools without a device because
>> dma_alloc_coherent() supports allocations without a device. But nobody
>> ended up using dma pools without a device, so the current checks
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