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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: 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 X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-Network-Message-Id: 55fe19df-7941-4375-3a31-08db4a6e506a X-MS-Exchange-CrossTenant-AuthSource: LV2PR12MB5869.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 01 May 2023 18:03:06.1525 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: jXtYuIMnNeXpU4o16wbYtFcNL0OpBXoVjqFNoLdyLbHsZzhMtKv1ysOxlbZwH/I2 X-MS-Exchange-Transport-CrossTenantHeadersStamped: IA1PR12MB6457 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230501_110315_211114_B9F63603 X-CRM114-Status: GOOD ( 15.92 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org tegra-gart seems to be kind of wonky since from the start its 'detach_dev' op doesn't actually touch hardware. It is supposed to empty the GART of all translations loaded into it. Call this weirdness PLATFORM which keeps the basic original ops->detach_dev() semantic alive without needing much special core code support. I'm guessing it really ends up in a BLOCKING configuration, but without any forced cleanup it is unsafe. Signed-off-by: Jason Gunthorpe Signed-off-by: Robin Murphy --- drivers/iommu/tegra-gart.c | 30 ++++++++++++++++++++++++++++-- 1 file changed, 28 insertions(+), 2 deletions(-) diff --git a/drivers/iommu/tegra-gart.c b/drivers/iommu/tegra-gart.c index a482ff838b5331..09865889ff2480 100644 --- a/drivers/iommu/tegra-gart.c +++ b/drivers/iommu/tegra-gart.c @@ -124,11 +124,27 @@ static int gart_iommu_attach_dev(struct iommu_domain *domain, return ret; } -static void gart_iommu_set_platform_dma(struct device *dev) +/* + * FIXME: This weird function that doesn't touch the HW, but it is supposed to + * zap any current translation from the HW. + * + * Preserve whatever this was doing in 2011 as basically the same in the + * new API. The IOMMU_DOMAIN_PLATFORM's attach_dev function is called at almost + * the same times as the old detach_dev. + * + * I suspect the reality is that the UNMANAGED domain is never actually detached + * in real systems, or it is only detached once eveything is already unmapped, + * so this could get by this way. + */ +static int gart_iommu_platform_attach(struct iommu_domain *identity_domain, + struct device *dev) { struct iommu_domain *domain = iommu_get_domain_for_dev(dev); struct gart_device *gart = gart_handle; + if (domain == identity_domain || !domain) + return 0; + spin_lock(&gart->dom_lock); if (dev_iommu_priv_get(dev) == domain) { @@ -139,8 +155,18 @@ static void gart_iommu_set_platform_dma(struct device *dev) } spin_unlock(&gart->dom_lock); + return 0; } +static struct iommu_domain_ops gart_iommu_platform_ops = { + .attach_dev = gart_iommu_platform_attach, +}; + +static struct iommu_domain gart_iommu_platform_domain = { + .type = IOMMU_DOMAIN_PLATFORM, + .ops = &gart_iommu_platform_ops, +}; + static struct iommu_domain *gart_iommu_domain_alloc(unsigned type) { struct iommu_domain *domain; @@ -267,10 +293,10 @@ static void gart_iommu_sync(struct iommu_domain *domain, } static const struct iommu_ops gart_iommu_ops = { + .default_domain = &gart_iommu_platform_domain, .domain_alloc = gart_iommu_domain_alloc, .probe_device = gart_iommu_probe_device, .device_group = generic_device_group, - .set_platform_dma_ops = gart_iommu_set_platform_dma, .pgsize_bitmap = GART_IOMMU_PGSIZES, .of_xlate = gart_iommu_of_xlate, .default_domain_ops = &(const struct iommu_domain_ops) {