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From: Shameerali Kolothum Thodi <shameerali.kolothum.thodi@huawei.com>
To: "erik.kaneda@intel.com" <erik.kaneda@intel.com>,
	"linux-arm-kernel@lists.infradead.org" 
	<linux-arm-kernel@lists.infradead.org>,
	"linux-acpi@vger.kernel.org" <linux-acpi@vger.kernel.org>,
	"iommu@lists.linux-foundation.org"
	<iommu@lists.linux-foundation.org>,
	"devel@acpica.org" <devel@acpica.org>,
	Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
	"robert.moore@intel.com" <robert.moore@intel.com>
Cc: Linuxarm <linuxarm@huawei.com>,
	"steven.price@arm.com" <steven.price@arm.com>,
	"Guohanjun (Hanjun Guo)" <guohanjun@huawei.com>,
	"Sami.Mujawar@arm.com" <Sami.Mujawar@arm.com>,
	"robin.murphy@arm.com" <robin.murphy@arm.com>,
	wanghuiqiang <wanghuiqiang@huawei.com>
Subject: RE: [RFC PATCH v2 1/8] ACPICA: IORT: Update for revision E
Date: Mon, 22 Mar 2021 10:36:04 +0000
Message-ID: <b7a2424941214b33803e34ba3e532440@huawei.com> (raw)
In-Reply-To: <20201119121150.3316-2-shameerali.kolothum.thodi@huawei.com>

[+]

Hi Erik,

As this is now just merged ino acpica-master and based on the discussion we had here,

https://github.com/acpica/acpica/pull/638

I had a discussion with ARM folks(Lorenzo) in the linaro-open-discussions call and
can confirm that the IORT Revision E is not the final specification and has some issues
which is now corrected in the latest E.b revision[1]. Also there are no current users
for the Rev E and it may not be a good idea to push this version into the Linux kernel
or elsewhere.

So could you please revert the merge and I am planning to work on the E.b soon.
Please let me know if I need to explicitly send a revert pull request or not.

Thanks,
Shameer

1. https://developer.arm.com/documentation/den0049/latest/

> -----Original Message-----
> From: iommu [mailto:iommu-bounces@lists.linux-foundation.org] On Behalf Of
> Shameer Kolothum
> Sent: 19 November 2020 12:12
> To: linux-arm-kernel@lists.infradead.org; linux-acpi@vger.kernel.org;
> iommu@lists.linux-foundation.org; devel@acpica.org
> Cc: Linuxarm <linuxarm@huawei.com>; steven.price@arm.com; Guohanjun
> (Hanjun Guo) <guohanjun@huawei.com>; Sami.Mujawar@arm.com;
> robin.murphy@arm.com; wanghuiqiang <wanghuiqiang@huawei.com>
> Subject: [RFC PATCH v2 1/8] ACPICA: IORT: Update for revision E
> 
> IORT revision E contains a few additions like,
>     -Added an identifier field in the node descriptors to aid table
>      cross-referencing.
>     -Introduced the Reserved Memory Range(RMR) node. This is used
>      to describe memory ranges that are used by endpoints and requires
>      a unity mapping in SMMU.
>     -Introduced a flag in the RC node to express support for PRI.
> 
> Signed-off-by: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>
> ---
>  include/acpi/actbl2.h | 25 +++++++++++++++++++------
>  1 file changed, 19 insertions(+), 6 deletions(-)
> 
> diff --git a/include/acpi/actbl2.h b/include/acpi/actbl2.h index
> ec66779cb193..274fce7b5c01 100644
> --- a/include/acpi/actbl2.h
> +++ b/include/acpi/actbl2.h
> @@ -68,7 +68,7 @@
>   * IORT - IO Remapping Table
>   *
>   * Conforms to "IO Remapping Table System Software on ARM Platforms",
> - * Document number: ARM DEN 0049D, March 2018
> + * Document number: ARM DEN 0049E, June 2020
>   *
> 
> ****************************************************************
> **************/
> 
> @@ -86,7 +86,8 @@ struct acpi_iort_node {
>  	u8 type;
>  	u16 length;
>  	u8 revision;
> -	u32 reserved;
> +	u16 reserved;
> +	u16 identifier;
>  	u32 mapping_count;
>  	u32 mapping_offset;
>  	char node_data[1];
> @@ -100,7 +101,8 @@ enum acpi_iort_node_type {
>  	ACPI_IORT_NODE_PCI_ROOT_COMPLEX = 0x02,
>  	ACPI_IORT_NODE_SMMU = 0x03,
>  	ACPI_IORT_NODE_SMMU_V3 = 0x04,
> -	ACPI_IORT_NODE_PMCG = 0x05
> +	ACPI_IORT_NODE_PMCG = 0x05,
> +	ACPI_IORT_NODE_RMR = 0x06,
>  };
> 
>  struct acpi_iort_id_mapping {
> @@ -167,10 +169,10 @@ struct acpi_iort_root_complex {
>  	u8 reserved[3];		/* Reserved, must be zero */
>  };
> 
> -/* Values for ats_attribute field above */
> +/* Masks for ats_attribute field above */
> 
> -#define ACPI_IORT_ATS_SUPPORTED         0x00000001	/* The root
> complex supports ATS */
> -#define ACPI_IORT_ATS_UNSUPPORTED       0x00000000	/* The root
> complex doesn't support ATS */
> +#define ACPI_IORT_ATS_SUPPORTED         (1)	/* The root complex
> supports ATS */
> +#define ACPI_IORT_PRI_SUPPORTED         (1<<1)	/* The root complex
> supports PRI */
> 
>  struct acpi_iort_smmu {
>  	u64 base_address;	/* SMMU base address */
> @@ -241,6 +243,17 @@ struct acpi_iort_pmcg {
>  	u64 page1_base_address;
>  };
> 
> +struct acpi_iort_rmr {
> +	u32 rmr_count;
> +	u32 rmr_offset;
> +};
> +
> +struct acpi_iort_rmr_desc {
> +	u64 base_address;
> +	u64 length;
> +	u32 reserved;
> +};
> +
> 
> /***************************************************************
> ****************
>   *
>   * IVRS - I/O Virtualization Reporting Structure
> --
> 2.17.1
> 
> _______________________________________________
> iommu mailing list
> iommu@lists.linux-foundation.org
> https://lists.linuxfoundation.org/mailman/listinfo/iommu

  reply index

Thread overview: 34+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-11-19 12:11 [RFC PATCH v2 0/8] ACPI/IORT: Support for IORT RMR node Shameer Kolothum
2020-11-19 12:11 ` [RFC PATCH v2 1/8] ACPICA: IORT: Update for revision E Shameer Kolothum
2021-03-22 10:36   ` Shameerali Kolothum Thodi [this message]
2021-03-22 21:57     ` Kaneda, Erik
2021-03-23 15:53       ` Lorenzo Pieralisi
2021-03-23 18:51         ` Kaneda, Erik
2021-03-24  9:50           ` Lorenzo Pieralisi
2021-03-25  8:40     ` Jon Nettleton
2021-03-25 15:54       ` Shameerali Kolothum Thodi
2021-04-15  7:27   ` Auger Eric
2020-11-19 12:11 ` [RFC PATCH v2 2/8] ACPI/IORT: Add support for RMR node parsing Shameer Kolothum
2021-04-15  9:39   ` Auger Eric
2021-04-15 10:30     ` Shameerali Kolothum Thodi
2020-11-19 12:11 ` [RFC PATCH v2 3/8] iommu/dma: Introduce generic helper to retrieve RMR info Shameer Kolothum
2020-11-19 12:11 ` [RFC PATCH v2 4/8] ACPI/IORT: Add RMR memory regions reservation helper Shameer Kolothum
2020-11-19 12:11 ` [RFC PATCH v2 5/8] iommu/arm-smmu-v3: Introduce strtab init helper Shameer Kolothum
2020-11-19 12:11 ` [RFC PATCH v2 6/8] iommu/arm-smmu-v3: Add bypass flag to arm_smmu_write_strtab_ent() Shameer Kolothum
2020-11-19 12:11 ` [RFC PATCH v2 7/8] iommu/arm-smmu-v3: Get associated RMR info and install bypass STE Shameer Kolothum
2020-11-19 12:11 ` [RFC PATCH v2 8/8] iommu/arm-smmu-v3: Reserve any RMR regions associated with a dev Shameer Kolothum
2020-12-10 10:25 ` [RFC PATCH v2 0/8] ACPI/IORT: Support for IORT RMR node Steven Price
2020-12-14 10:55   ` Shameerali Kolothum Thodi
2020-12-14 12:33     ` Robin Murphy
2020-12-14 13:42       ` Steven Price
2020-12-14 14:47         ` Shameerali Kolothum Thodi
2020-12-17 14:47           ` Jon Nettleton
2020-12-17 15:42             ` Shameerali Kolothum Thodi
2020-12-17 15:53               ` Jon Nettleton
2020-12-18 10:53                 ` Jon Nettleton
2021-01-04  8:55                   ` Shameerali Kolothum Thodi
2021-01-04 10:55                     ` Jon Nettleton
2021-04-09  9:50 ` Auger Eric
2021-04-09 10:08   ` Shameerali Kolothum Thodi
2021-04-15  9:48 ` Auger Eric
2021-04-15 10:37   ` Shameerali Kolothum Thodi

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