Re: [PATCH] iommu/arm-smmu-v3, acpi: Add temporary Cavium SMMU-V3 IORT model number definitions

[Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>]

On Fri, Jun 23, 2017 at 06:59:33AM +0200, Robert Richter wrote:
> On 23.06.17 06:55:41, Robert Richter wrote:
> > On 22.06.17 22:04:37, Lorenzo Pieralisi wrote:
> > > On Thu, Jun 22, 2017 at 09:35:35PM +0200, Robert Richter wrote:
> > > > On 22.06.17 19:58:22, Will Deacon wrote:
> > > > > On Thu, Jun 22, 2017 at 07:22:57PM +0100, Will Deacon wrote:
> > > > > > On Thu, Jun 22, 2017 at 05:35:35PM +0530, Geetha sowjanya wrote:
> > > > > > > Cavium ThunderX2 SMMUv3 implementation has two Silicon Erratas.
> > > > > > > 1. Errata ID #74
> > > > > > >    SMMU register alias Page 1 is not implemented
> > > > > > > 2. Errata ID #126
> > > > > > >    SMMU doesnt support unique IRQ lines and also MSI for gerror,
> > > > > > >    eventq and cmdq-sync
> > > > > > > 
> > > > > > > The following patchset does software workaround for these two erratas.
> > > > > > 
> > > > > > I've picked up the first two patches, and left comments on the final patch.
> > > > > 
> > > > > ... except that it doesn't build:
> > > > > 
> > > > > 
> > > > > drivers/acpi/arm64/iort.c: In function ‘arm_smmu_v3_resource_size’:
> > > > > drivers/acpi/arm64/iort.c:837:21: error: ‘ACPI_IORT_SMMU_V3_CAVIUM_CN99XX’ undeclared (first use in this function)
> > > > >   if (smmu->model == ACPI_IORT_SMMU_V3_CAVIUM_CN99XX)
> > > > >                      ^
> > > > > drivers/acpi/arm64/iort.c:837:21: note: each undeclared identifier is reported only once for each function it appears in
> > > > > make[4]: *** [drivers/acpi/arm64/iort.o] Error 1
> > > > > 
> > > > > 
> > > > > I don't see ACPI_IORT_SMMU_V3_CAVIUM_CN99XX defined, even in linux-next.
> > > > > 
> > > > > What's the plan here?
> > > > 
> > > > It is defined already in acpica and we actually waiting for the acpi
> > > > maintainers to include it:
> > > > 
> > > >  https://github.com/acpica/acpica/commit/d00a4eb86e64
> > > > 
> > > > We could add
> > > > 
> > > > /* Until ACPICA headers cover IORT rev. C */
> > > > #ifndef ACPI_IORT_SMMU_V3_CAVIUM_CN99XX
> > > > #define ACPI_IORT_SMMU_V3_CAVIUM_CN99XX		0x2
> > > > #endif
> > > > 
> > > > to both files:
> > > > 
> > > >  drivers/acpi/arm64/iort.c
> > > >  drivers/iommu/arm-smmu-v3.c
> > > > 
> > > 
> > > I thought it was a solved problem (and that the IORT patch was based
> > > on Robin's workaround) but I was clearly wrong and I apologise to
> > > Will about this.
> > > 
> > > FWIW, you could add the define in include/linux/acpi_iort.h and I will
> > > remove it whenever ACPICA changes make it into the kernel.
> > 
> > Adding it there will still let depend us on acpi maintainers, while I
> > think the over 2 files might go through arm64 tree smoothly. A change
> > in acpi_iort.h also adds the definition to other archs and I don't
> > think that adding arch #ifdefs to avoid that are welcome in that
> > header file too.
> > 
> > I am going to resend my patch below with an improved wording.
> 
> Here it comes:
> 
> From d210b4c540bc4adcebd51d5a87437d2049649e94 Mon Sep 17 00:00:00 2001
> From: Robert Richter <rrichter@cavium.com>
> Date: Thu, 22 Jun 2017 21:20:54 +0200
> Subject: [PATCH] iommu/arm-smmu-v3, acpi: Add temporary Cavium SMMU-V3 IORT
>  model number definitions
> 
> The model number is already defined in acpica and we are actually
> waiting for the acpi maintainers to include it:
> 
>  https://github.com/acpica/acpica/commit/d00a4eb86e64
> 
> Adding those temporary definitions until the change makes it into
> include/acpi/actbl2.h. Once that is done this patch can be reverted.
> 
> Signed-off-by: Robert Richter <rrichter@cavium.com>
> ---
>  drivers/acpi/arm64/iort.c   | 5 +++++

Acked-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>

>  drivers/iommu/arm-smmu-v3.c | 5 +++++
>  2 files changed, 10 insertions(+)
> 
> diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c
> index 797b28dc7b34..15491237a657 100644
> --- a/drivers/acpi/arm64/iort.c
> +++ b/drivers/acpi/arm64/iort.c
> @@ -31,6 +31,11 @@
>  #define IORT_IOMMU_TYPE		((1 << ACPI_IORT_NODE_SMMU) |	\
>  				(1 << ACPI_IORT_NODE_SMMU_V3))
>  
> +/* Until ACPICA headers cover IORT rev. C */
> +#ifndef ACPI_IORT_SMMU_V3_CAVIUM_CN99XX
> +#define ACPI_IORT_SMMU_V3_CAVIUM_CN99XX		0x2
> +#endif
> +
>  struct iort_its_msi_chip {
>  	struct list_head	list;
>  	struct fwnode_handle	*fw_node;
> diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c
> index 380969aa60d5..c759dfa7442d 100644
> --- a/drivers/iommu/arm-smmu-v3.c
> +++ b/drivers/iommu/arm-smmu-v3.c
> @@ -412,6 +412,11 @@
>  #define MSI_IOVA_BASE			0x8000000
>  #define MSI_IOVA_LENGTH			0x100000
>  
> +/* Until ACPICA headers cover IORT rev. C */
> +#ifndef ACPI_IORT_SMMU_V3_CAVIUM_CN99XX
> +#define ACPI_IORT_SMMU_V3_CAVIUM_CN99XX		0x2
> +#endif
> +
>  static bool disable_bypass;
>  module_param_named(disable_bypass, disable_bypass, bool, S_IRUGO);
>  MODULE_PARM_DESC(disable_bypass,
> -- 
> 2.11.0
>