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Add a type2 driver for a CXL emulated device inside CXL kernel testing infrastructure as a client for the functionality added. Based on: https://lore.kernel.org/linux-cxl/168592149709.1948938.8663425987110396027.stgit@dwillia2-xfh.jf.intel.com/T/#mef63c11ff2ffc265b75785caeb2c2370953ccf44 Signed-off-by: Alejandro Lucero Co-developed-by: Dan Williams On 5/16/24 09:11, alucerop@amd.com wrote: > From: Alejandro Lucero > > Differientiating Type3, aka memory expanders, from Type2, aka device > accelerators, with a new function for initializing cxl_dev_state. > > Adding a type2 driver for a CXL emulated device inside CXL kernel > testing infrastructure as a client for the functionality added. > > Signed-off-by: Alejandro Lucero > Signed-off-by: Dan Williams > --- > drivers/cxl/core/memdev.c | 15 ++++++ > include/linux/cxlmem.h | 2 + > tools/testing/cxl/Kbuild | 1 + > tools/testing/cxl/type2/Kbuild | 7 +++ > tools/testing/cxl/type2/pci_type2.c | 80 +++++++++++++++++++++++++++++ > 5 files changed, 105 insertions(+) > create mode 100644 tools/testing/cxl/type2/Kbuild > create mode 100644 tools/testing/cxl/type2/pci_type2.c > > diff --git a/drivers/cxl/core/memdev.c b/drivers/cxl/core/memdev.c > index 07cd0b8b026f..0336b3f14f4a 100644 > --- a/drivers/cxl/core/memdev.c > +++ b/drivers/cxl/core/memdev.c > @@ -659,6 +659,21 @@ static void detach_memdev(struct work_struct *work) > > static struct lock_class_key cxl_memdev_key; > > +struct cxl_dev_state *cxl_accel_state_create(struct device *dev) > +{ > + struct cxl_dev_state *cxlds; > + > + cxlds = devm_kzalloc(dev, sizeof(*cxlds), GFP_KERNEL); > + if (!cxlds) > + return ERR_PTR(-ENOMEM); > + > + cxlds->dev = dev; > + cxlds->type = CXL_DEVTYPE_DEVMEM; > + > + return cxlds; > +} > +EXPORT_SYMBOL_NS_GPL(cxl_accel_state_create, CXL); > + > static struct cxl_memdev *cxl_memdev_alloc(struct cxl_dev_state *cxlds, > const struct file_operations *fops) > { > diff --git a/include/linux/cxlmem.h b/include/linux/cxlmem.h > index 0d26a45a4af2..e8d12b543db1 100644 > --- a/include/linux/cxlmem.h > +++ b/include/linux/cxlmem.h > @@ -859,4 +859,6 @@ struct cxl_hdm { > struct seq_file; > struct dentry *cxl_debugfs_create_dir(const char *dir); > void cxl_dpa_debug(struct seq_file *file, struct cxl_dev_state *cxlds); > + > +struct cxl_dev_state *cxl_accel_state_create(struct device *dev); > #endif /* __CXL_MEM_H__ */ > diff --git a/tools/testing/cxl/Kbuild b/tools/testing/cxl/Kbuild > index 030b388800f0..a285719c4db6 100644 > --- a/tools/testing/cxl/Kbuild > +++ b/tools/testing/cxl/Kbuild > @@ -69,3 +69,4 @@ cxl_core-y += cxl_core_exports.o > KBUILD_CFLAGS := $(filter-out -Wmissing-prototypes -Wmissing-declarations, $(KBUILD_CFLAGS)) > > obj-m += test/ > +obj-m += type2/ > diff --git a/tools/testing/cxl/type2/Kbuild b/tools/testing/cxl/type2/Kbuild > new file mode 100644 > index 000000000000..a96ad4d64924 > --- /dev/null > +++ b/tools/testing/cxl/type2/Kbuild > @@ -0,0 +1,7 @@ > +# SPDX-License-Identifier: GPL-2.0 > + > +obj-m += pci_type2.o > + > +cxl_pci_type2-y := cxl_pci_type2.o > + > +KBUILD_CFLAGS := $(filter-out -Wmissing-prototypes -Wmissing-declarations, $(KBUILD_CFLAGS)) > diff --git a/tools/testing/cxl/type2/pci_type2.c b/tools/testing/cxl/type2/pci_type2.c > new file mode 100644 > index 000000000000..863ce7dc28ef > --- /dev/null > +++ b/tools/testing/cxl/type2/pci_type2.c > @@ -0,0 +1,80 @@ > +#include > +#include > +#include > +#include > +#include > + > +struct cxl_dev_state *cxlds; > + > +#define CXL_TYPE2_MEM_SIZE (1024*1024*256) > + > +static int type2_pci_probe(struct pci_dev *pci_dev, > + const struct pci_device_id *entry) > + > +{ > + u16 dvsec; > + > + dvsec = pci_find_dvsec_capability(pci_dev, PCI_DVSEC_VENDOR_ID_CXL, CXL_DVSEC_PCIE_DEVICE); > + > + if (!dvsec) { > + pci_info(pci_dev, "No CXL capability (vendor: %x\n", pci_dev->vendor); > + return 0; > + } else { > + pci_info(pci_dev, "CXL CXL_DVSEC_PCIE_DEVICE capability found"); > + } > + > + cxlds = cxl_accel_state_create(&pci_dev->dev); > + if (IS_ERR(cxlds)) > + return PTR_ERR(cxlds); > + > + pci_info(pci_dev, "Initializing cxlds..."); > + cxlds->cxl_dvsec = dvsec; > + cxlds->serial = pci_dev->dev.id; > + > + /* Should not this be based on DVSEC range size registers */ > + cxlds->dpa_res = DEFINE_RES_MEM(0, CXL_TYPE2_MEM_SIZE); > + cxlds->ram_res = DEFINE_RES_MEM_NAMED(0, CXL_TYPE2_MEM_SIZE, "ram"); > + > + return 0; > +} > + > +static void type2_pci_remove(struct pci_dev *pci_dev) > +{ > + > +} > + > +/* PCI device ID table */ > +static const struct pci_device_id type2_pci_table[] = { > + {PCI_DEVICE(PCI_VENDOR_ID_AMD, 0xbabe)}, > + {0} /* end of list */ > +}; > + > +static struct pci_driver type2_pci_driver = { > + .name = KBUILD_MODNAME, > + .id_table = type2_pci_table, > + .probe = type2_pci_probe, > + .remove = type2_pci_remove, > +}; > + > +static int __init type2_cxl_init(void) > +{ > + int rc; > + > + rc = pci_register_driver(&type2_pci_driver); > + > + return rc; > +} > + > +static void __exit type2_cxl_exit(void) > +{ > + pci_unregister_driver(&type2_pci_driver); > +} > + > +module_init(type2_cxl_init); > +module_exit(type2_cxl_exit); > + > +MODULE_AUTHOR("Alejadro Lucero "); > +MODULE_DESCRIPTION("CXL Type2 device support, driver test"); > +MODULE_LICENSE("GPL"); > +MODULE_IMPORT_NS(CXL); > +MODULE_DEVICE_TABLE(pci, type2_pci_table);