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Mon, 25 Mar 2024 23:08:09 -0500 From: Nipun Gupta To: , , , , CC: , , , , , , , , Nipun Gupta Subject: [PATCH v5 1/2] genirq/msi: add wrapper msi allocation API and export msi functions Date: Tue, 26 Mar 2024 09:38:03 +0530 Message-ID: <20240326040804.640860-1-nipun.gupta@amd.com> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CY4PEPF0000FCC2:EE_|CH3PR12MB7641:EE_ X-MS-Office365-Filtering-Correlation-Id: aa0cf3aa-744e-4087-4091-08dc4d4a6458 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:165.204.84.17;CTRY:US;LANG:en;SCL:1;SRV:;IPV:CAL;SFV:NSPM;H:SATLEXMB04.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230031)(36860700004)(82310400014)(376005)(1800799015);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 26 Mar 2024 04:08:28.4473 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: aa0cf3aa-744e-4087-4091-08dc4d4a6458 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: CY4PEPF0000FCC2.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CH3PR12MB7641 MSI functions for allocation and free can be directly used by the device drivers without any wrapper provided by bus drivers. So export these MSI functions. Also, add a wrapper API to allocate MSIs providing only the number of interrupts rather than range for simpler driver usage. Signed-off-by: Nipun Gupta Reviewed-by: Thomas Gleixner --- Changes in v4->v5: - updated commit description as per the comments. - Rebased on 6.9-rc1 Changes in v3->v4: - No change Changes in v3: - New in this patch series. VFIO-CDX uses the new wrapper API msi_domain_alloc_irqs and exported APIs. (This patch is moved from CDX interrupt support to vfio-cdx patch, where these APIs are used). include/linux/msi.h | 6 ++++++ kernel/irq/msi.c | 2 ++ 2 files changed, 8 insertions(+) diff --git a/include/linux/msi.h b/include/linux/msi.h index 26d07e23052e..765a65581a66 100644 --- a/include/linux/msi.h +++ b/include/linux/msi.h @@ -676,6 +676,12 @@ int platform_device_msi_init_and_alloc_irqs(struct device *dev, unsigned int nve void platform_device_msi_free_irqs_all(struct device *dev); bool msi_device_has_isolated_msi(struct device *dev); + +static inline int msi_domain_alloc_irqs(struct device *dev, unsigned int domid, int nirqs) +{ + return msi_domain_alloc_irqs_range(dev, domid, 0, nirqs - 1); +} + #else /* CONFIG_GENERIC_MSI_IRQ */ static inline bool msi_device_has_isolated_msi(struct device *dev) { diff --git a/kernel/irq/msi.c b/kernel/irq/msi.c index f90952ebc494..2024f89baea4 100644 --- a/kernel/irq/msi.c +++ b/kernel/irq/msi.c @@ -1434,6 +1434,7 @@ int msi_domain_alloc_irqs_range(struct device *dev, unsigned int domid, msi_unlock_descs(dev); return ret; } +EXPORT_SYMBOL_GPL(msi_domain_alloc_irqs_range); /** * msi_domain_alloc_irqs_all_locked - Allocate all interrupts from a MSI interrupt domain @@ -1680,6 +1681,7 @@ void msi_domain_free_irqs_range(struct device *dev, unsigned int domid, msi_domain_free_irqs_range_locked(dev, domid, first, last); msi_unlock_descs(dev); } +EXPORT_SYMBOL_GPL(msi_domain_free_irqs_all); /** * msi_domain_free_irqs_all_locked - Free all interrupts from a MSI interrupt domain