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Fri, 2 Dec 2022 00:34:32 +0000 Date: Thu, 1 Dec 2022 16:34:27 -0800 From: Ira Weiny To: Dan Williams CC: Davidlohr Bueso , Bjorn Helgaas , Jonathan Cameron , Alison Schofield , Vishal Verma , "Ben Widawsky" , Steven Rostedt , "Dave Jiang" , , Subject: Re: [PATCH V2 01/11] cxl/pci: Add generic MSI-X/MSI irq support Message-ID: References: <20221201002719.2596558-1-ira.weiny@intel.com> <20221201002719.2596558-2-ira.weiny@intel.com> <63894579bf550_3cbe029458@dwillia2-xfh.jf.intel.com.notmuch> Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: <63894579bf550_3cbe029458@dwillia2-xfh.jf.intel.com.notmuch> X-ClientProxiedBy: BY3PR10CA0005.namprd10.prod.outlook.com (2603:10b6:a03:255::10) To SA1PR11MB6733.namprd11.prod.outlook.com (2603:10b6:806:25c::17) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SA1PR11MB6733:EE_|MW5PR11MB5882:EE_ X-MS-Office365-Filtering-Correlation-Id: 3fb19f82-b759-489d-1aae-08dad3fcfae4 X-LD-Processed: 46c98d88-e344-4ed4-8496-4ed7712e255d,ExtAddr X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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The device may > > however support less than 16 entries depending on the support it > > provides. > > > > Attempt to allocate these 16 irq vectors. If the device supports less > > then the PCI infrastructure will allocate that number. > > What happens if the device supports 16, but irq-core allocates less? I > believe the answer is with the first user, but this patch does not > include a user. > > > Store the number of vectors actually allocated in the device state for > > later use by individual functions. > > The patch does not do that. Sorry missed updating this message. > > I know this patch has gone through a lot of discussion, but this > mismatch shows it should really be squashed with the first user because > it does not stand on its own anymore. It is separate because it was Davidlohr's to begin with. I'll squash it back. > > > Upon successful allocation, users can plug in their respective isr at > > any point thereafter, for example, if the irq setup is not done in the > > PCI driver, such as the case of the CXL-PMU. > > > > Cc: Bjorn Helgaas > > Cc: Jonathan Cameron > > Co-developed-by: Ira Weiny > > Signed-off-by: Ira Weiny > > Signed-off-by: Davidlohr Bueso > > > > --- > > Changes from V1: > > Jonathan > > pci_alloc_irq_vectors() cleans up the vectors automatically > > use msi_enabled rather than nr_irq_vecs > > > > Changes from Ira > > Remove reviews > > Allocate up to a static 16 vectors. > > Change cover letter > > --- > > drivers/cxl/cxlmem.h | 3 +++ > > drivers/cxl/cxlpci.h | 6 ++++++ > > drivers/cxl/pci.c | 23 +++++++++++++++++++++++ > > 3 files changed, 32 insertions(+) > > > > diff --git a/drivers/cxl/cxlmem.h b/drivers/cxl/cxlmem.h > > index 88e3a8e54b6a..cd35f43fedd4 100644 > > --- a/drivers/cxl/cxlmem.h > > +++ b/drivers/cxl/cxlmem.h > > @@ -211,6 +211,7 @@ struct cxl_endpoint_dvsec_info { > > * @info: Cached DVSEC information about the device. > > * @serial: PCIe Device Serial Number > > * @doe_mbs: PCI DOE mailbox array > > + * @msi_enabled: MSI-X/MSI has been enabled > > * @mbox_send: @dev specific transport for transmitting mailbox commands > > * > > * See section 8.2.9.5.2 Capacity Configuration and Label Storage for > > @@ -247,6 +248,8 @@ struct cxl_dev_state { > > > > struct xarray doe_mbs; > > > > + bool msi_enabled; > > + > > This goes unused in this patch and it also duplicates what the core > offers with pdev->{msi,msix}_enabled. I tried to argue that with Jonathan and lost. What I had in V1 was to store the number actually allocated. Then if a function reports something higher later it can't be used. I admit that at this point I really don't understand PCI interrupts at all. Every time this patch is discussed I get (what is to me) confusing information. And I've been unable to discern from the spec how exactly this is all supposed to work. > > > int (*mbox_send)(struct cxl_dev_state *cxlds, struct cxl_mbox_cmd *cmd); > > }; > > > > diff --git a/drivers/cxl/cxlpci.h b/drivers/cxl/cxlpci.h > > index eec597dbe763..b7f4e2f417d3 100644 > > --- a/drivers/cxl/cxlpci.h > > +++ b/drivers/cxl/cxlpci.h > > @@ -53,6 +53,12 @@ > > #define CXL_DVSEC_REG_LOCATOR_BLOCK_ID_MASK GENMASK(15, 8) > > #define CXL_DVSEC_REG_LOCATOR_BLOCK_OFF_LOW_MASK GENMASK(31, 16) > > > > +/* > > + * NOTE: Currently all the functions which are enabled for CXL require their > > + * vectors to be in the first 16. Use this as the max. > > + */ > > +#define CXL_PCI_REQUIRED_VECTORS 16 > > + > > /* Register Block Identifier (RBI) */ > > enum cxl_regloc_type { > > CXL_REGLOC_RBI_EMPTY = 0, > > diff --git a/drivers/cxl/pci.c b/drivers/cxl/pci.c > > index faeb5d9d7a7a..8f86f85d89c7 100644 > > --- a/drivers/cxl/pci.c > > +++ b/drivers/cxl/pci.c > > @@ -428,6 +428,27 @@ static void devm_cxl_pci_create_doe(struct cxl_dev_state *cxlds) > > } > > } > > > > +static void cxl_pci_alloc_irq_vectors(struct cxl_dev_state *cxlds) > > +{ > > + struct device *dev = cxlds->dev; > > + struct pci_dev *pdev = to_pci_dev(dev); > > + int nvecs; > > + > > + /* > > + * NOTE: pci_alloc_irq_vectors() handles calling pci_free_irq_vectors() > > + * automatically despite not being called pcim_*. See > > + * pci_setup_msi_context(). > > + */ > > + nvecs = pci_alloc_irq_vectors(pdev, 1, CXL_PCI_REQUIRED_VECTORS, > > + PCI_IRQ_MSIX | PCI_IRQ_MSI); > > clang-format would scooch that second line in for you. > > Might also be worth a comment for the next person that goes looking for > why this isn't PCI_IRQ_ALL_TYPES. > > From CXL 3.0 3.1.1 CXL.io Endpoint: > A Function on a CXL device must not generate INTx messages if that > Function participates in CXL.cache protocol or CXL.mem protocols. Seems reasonable. Ira > > > > + if (nvecs < 0) { > > + dev_dbg(dev, "Failed to alloc irq vectors; use polling instead.\n"); > > + return; > > + } > > + > > + cxlds->msi_enabled = true; > > +} > > + > > static int cxl_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id) > > { > > struct cxl_register_map map; > > @@ -494,6 +515,8 @@ static int cxl_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id) > > if (rc) > > return rc; > > > > + cxl_pci_alloc_irq_vectors(cxlds); > > + > > cxlmd = devm_cxl_add_memdev(cxlds); > > if (IS_ERR(cxlmd)) > > return PTR_ERR(cxlmd); > > -- > > 2.37.2 > > > >