From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932458Ab1LENhR (ORCPT ); Mon, 5 Dec 2011 08:37:17 -0500 Received: from ch1ehsobe005.messaging.microsoft.com ([216.32.181.185]:54384 "EHLO ch1outboundpool.messaging.microsoft.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932323Ab1LENfS (ORCPT ); Mon, 5 Dec 2011 08:35:18 -0500 X-SpamScore: 0 X-BigFish: VPS0(zzzz1202hzz8275bhz2dh668h839h) X-Forefront-Antispam-Report: CIP:163.181.249.109;KIP:(null);UIP:(null);IPV:NLI;H:ausb3twp02.amd.com;RD:none;EFVD:NLI X-WSS-ID: 0LVQGEM-02-AUW-02 X-M-MSG: From: Joerg Roedel To: CC: , Joerg Roedel Subject: [PATCH 22/22] iommu/amd: Add invalid_ppr callback Date: Mon, 5 Dec 2011 14:34:37 +0100 Message-ID: <1323092077-25501-23-git-send-email-joerg.roedel@amd.com> X-Mailer: git-send-email 1.7.5.4 In-Reply-To: <1323092077-25501-1-git-send-email-joerg.roedel@amd.com> References: <1323092077-25501-1-git-send-email-joerg.roedel@amd.com> MIME-Version: 1.0 Content-Type: text/plain X-OriginatorOrg: amd.com Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This callback can be used to change the PRI response code sent to a device when a PPR fault fails. Signed-off-by: Joerg Roedel --- drivers/iommu/amd_iommu_v2.c | 57 ++++++++++++++++++++++++++++++++++++++++- include/linux/amd-iommu.h | 34 ++++++++++++++++++++++-- 2 files changed, 86 insertions(+), 5 deletions(-) diff --git a/drivers/iommu/amd_iommu_v2.c b/drivers/iommu/amd_iommu_v2.c index ffe85e0..7f63a4d 100644 --- a/drivers/iommu/amd_iommu_v2.c +++ b/drivers/iommu/amd_iommu_v2.c @@ -62,6 +62,7 @@ struct device_state { struct iommu_domain *domain; int pasid_levels; int max_pasids; + amd_iommu_invalid_ppr_cb inv_ppr_cb; spinlock_t lock; wait_queue_head_t wq; }; @@ -504,10 +505,31 @@ static void do_fault(struct work_struct *work) npages = get_user_pages(fault->state->task, fault->state->mm, fault->address, 1, write, 0, &page, NULL); - if (npages == 1) + if (npages == 1) { put_page(page); - else + } else if (fault->dev_state->inv_ppr_cb) { + int status; + + status = fault->dev_state->inv_ppr_cb(fault->dev_state->pdev, + fault->pasid, + fault->address, + fault->flags); + switch (status) { + case AMD_IOMMU_INV_PRI_RSP_SUCCESS: + set_pri_tag_status(fault->state, fault->tag, PPR_SUCCESS); + break; + case AMD_IOMMU_INV_PRI_RSP_INVALID: + set_pri_tag_status(fault->state, fault->tag, PPR_INVALID); + break; + case AMD_IOMMU_INV_PRI_RSP_FAIL: + set_pri_tag_status(fault->state, fault->tag, PPR_FAILURE); + break; + default: + BUG(); + } + } else { set_pri_tag_status(fault->state, fault->tag, PPR_INVALID); + } finish_pri_tag(fault->dev_state, fault->state, fault->tag); @@ -820,6 +842,37 @@ void amd_iommu_free_device(struct pci_dev *pdev) } EXPORT_SYMBOL(amd_iommu_free_device); +int amd_iommu_set_invalid_ppr_cb(struct pci_dev *pdev, + amd_iommu_invalid_ppr_cb cb) +{ + struct device_state *dev_state; + unsigned long flags; + u16 devid; + int ret; + + if (!amd_iommu_v2_supported()) + return -ENODEV; + + devid = device_id(pdev); + + spin_lock_irqsave(&state_lock, flags); + + ret = -EINVAL; + dev_state = state_table[devid]; + if (dev_state == NULL) + goto out_unlock; + + dev_state->inv_ppr_cb = cb; + + ret = 0; + +out_unlock: + spin_unlock_irqrestore(&state_lock, flags); + + return ret; +} +EXPORT_SYMBOL(amd_iommu_set_invalid_ppr_cb); + static int __init amd_iommu_v2_init(void) { size_t state_table_size; diff --git a/include/linux/amd-iommu.h b/include/linux/amd-iommu.h index 23e21e1..06688c4 100644 --- a/include/linux/amd-iommu.h +++ b/include/linux/amd-iommu.h @@ -28,9 +28,6 @@ struct task_struct; struct pci_dev; extern int amd_iommu_detect(void); -extern int amd_iommu_bind_pasid(struct pci_dev *pdev, int pasid, - struct task_struct *task); -extern void amd_iommu_unbind_pasid(struct pci_dev *pdev, int pasid); /** @@ -91,6 +88,37 @@ extern int amd_iommu_bind_pasid(struct pci_dev *pdev, int pasid, */ extern void amd_iommu_unbind_pasid(struct pci_dev *pdev, int pasid); +/** + * amd_iommu_set_invalid_ppr_cb() - Register a call-back for failed + * PRI requests + * @pdev: The PCI device the call-back should be registered for + * @cb: The call-back function + * + * The IOMMUv2 driver invokes this call-back when it is unable to + * successfully handle a PRI request. The device driver can then decide + * which PRI response the device should see. Possible return values for + * the call-back are: + * + * - AMD_IOMMU_INV_PRI_RSP_SUCCESS - Send SUCCESS back to the device + * - AMD_IOMMU_INV_PRI_RSP_INVALID - Send INVALID back to the device + * - AMD_IOMMU_INV_PRI_RSP_FAIL - Send Failure back to the device, + * the device is required to disable + * PRI when it receives this response + * + * The function returns 0 on success or negative value on error. + */ +#define AMD_IOMMU_INV_PRI_RSP_SUCCESS 0 +#define AMD_IOMMU_INV_PRI_RSP_INVALID 1 +#define AMD_IOMMU_INV_PRI_RSP_FAIL 2 + +typedef int (*amd_iommu_invalid_ppr_cb)(struct pci_dev *pdev, + int pasid, + unsigned long address, + u16); + +extern int amd_iommu_set_invalid_ppr_cb(struct pci_dev *pdev, + amd_iommu_invalid_ppr_cb cb); + #else static inline int amd_iommu_detect(void) { return -ENODEV; } -- 1.7.5.4