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Reimplement pci_epc_get() using pci_epc_get_fn() with a match name callback. Prepare the codebase for adding RC-to-EP doorbell support. Add DEFINE_FREE(pci_epc_put) to implement scope based auto cleanup. Signed-off-by: Frank Li --- change from v3 to v4 - none --- drivers/pci/endpoint/pci-epc-core.c | 23 +++++++++++++++++++++-- include/linux/pci-epc.h | 2 ++ 2 files changed, 23 insertions(+), 2 deletions(-) diff --git a/drivers/pci/endpoint/pci-epc-core.c b/drivers/pci/endpoint/pci-epc-core.c index 17f0071092550..14e6011df4b2c 100644 --- a/drivers/pci/endpoint/pci-epc-core.c +++ b/drivers/pci/endpoint/pci-epc-core.c @@ -48,6 +48,11 @@ void pci_epc_put(struct pci_epc *epc) } EXPORT_SYMBOL_GPL(pci_epc_put); +static bool pci_epc_match_name(struct device *dev, void *name) +{ + return strcmp(dev_name(dev), name) == 0; +} + /** * pci_epc_get() - get the PCI endpoint controller * @epc_name: device name of the endpoint controller @@ -56,6 +61,20 @@ EXPORT_SYMBOL_GPL(pci_epc_put); * endpoint controller */ struct pci_epc *pci_epc_get(const char *epc_name) +{ + return pci_epc_get_fn(pci_epc_match_name, (void *)epc_name); +} +EXPORT_SYMBOL_GPL(pci_epc_get); + +/** + * pci_epc_get_fn() - get the PCI endpoint controller + * @fn: callback match filter function, return true when matched + * @param: parameter for callback function fn + * + * Invoke to get struct pci_epc * corresponding to the device name of the + * endpoint controller + */ +struct pci_epc *pci_epc_get_fn(bool (*fn)(struct device *dev, void *param), void *param) { int ret = -EINVAL; struct pci_epc *epc; @@ -64,7 +83,7 @@ struct pci_epc *pci_epc_get(const char *epc_name) class_dev_iter_init(&iter, &pci_epc_class, NULL, NULL); while ((dev = class_dev_iter_next(&iter))) { - if (strcmp(epc_name, dev_name(dev))) + if (!fn(dev, param)) continue; epc = to_pci_epc(dev); @@ -82,7 +101,7 @@ struct pci_epc *pci_epc_get(const char *epc_name) class_dev_iter_exit(&iter); return ERR_PTR(ret); } -EXPORT_SYMBOL_GPL(pci_epc_get); +EXPORT_SYMBOL_GPL(pci_epc_get_fn); /** * pci_epc_get_first_free_bar() - helper to get first unreserved BAR diff --git a/include/linux/pci-epc.h b/include/linux/pci-epc.h index 42ef06136bd1a..682808f4510be 100644 --- a/include/linux/pci-epc.h +++ b/include/linux/pci-epc.h @@ -266,7 +266,9 @@ pci_epc_get_first_free_bar(const struct pci_epc_features *epc_features); enum pci_barno pci_epc_get_next_free_bar(const struct pci_epc_features *epc_features, enum pci_barno bar); struct pci_epc *pci_epc_get(const char *epc_name); +struct pci_epc *pci_epc_get_fn(bool (*fn)(struct device *dev, void *param), void *param); void pci_epc_put(struct pci_epc *epc); +DEFINE_FREE(pci_epc_put, void *, if (!(_T)) pci_epc_put(_T)) int pci_epc_mem_init(struct pci_epc *epc, phys_addr_t base, size_t size, size_t page_size); From patchwork Thu Oct 31 16:27:01 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Frank Li X-Patchwork-Id: 13858178 Received: from EUR05-VI1-obe.outbound.protection.outlook.com (mail-vi1eur05on2045.outbound.protection.outlook.com [40.107.21.45]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id D9D061C57A0; Thu, 31 Oct 2024 16:27:28 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=fail smtp.client-ip=40.107.21.45 ARC-Seal: i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730392051; cv=fail; b=PJcXyIXLSeuPahNQrAKRtJpIi0oMCyRCgreYwfFwEwwjumpVrFAjx1RqdlgpEikKL8VnV3/um67X9UZLmHTRjD1nI0oFtEqjRBTrTbvrGhzdo6+AUJV5gpobIs2kH2FZwzFbW2YUs+7D5johtoSLIZ+xWoqGoGRvA1iR98iM9rI= ARC-Message-Signature: i=2; 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It is the responsibility of the EPF driver to pass the actual message data to be written by the host to the doorbell BAR region through its own logic. Signed-off-by: Frank Li --- Change from v3 to v4 - msi change to use msi_get_virq() avoid use msi_for_each_desc(). - add new struct for pci_epf_doorbell_msg to msi msg,virq and irq name. - move mutex lock to epc function - initialize variable at declear place. - passdown epf to epc*() function to simplify code. --- drivers/pci/endpoint/Makefile | 2 +- drivers/pci/endpoint/pci-ep-msi.c | 128 ++++++++++++++++++++++++++++++++++++++ include/linux/pci-ep-msi.h | 15 +++++ include/linux/pci-epf.h | 19 ++++++ 4 files changed, 163 insertions(+), 1 deletion(-) diff --git a/drivers/pci/endpoint/Makefile b/drivers/pci/endpoint/Makefile index 95b2fe47e3b06..a1ccce440c2c5 100644 --- a/drivers/pci/endpoint/Makefile +++ b/drivers/pci/endpoint/Makefile @@ -5,4 +5,4 @@ obj-$(CONFIG_PCI_ENDPOINT_CONFIGFS) += pci-ep-cfs.o obj-$(CONFIG_PCI_ENDPOINT) += pci-epc-core.o pci-epf-core.o\ - pci-epc-mem.o functions/ + pci-epc-mem.o pci-ep-msi.o functions/ diff --git a/drivers/pci/endpoint/pci-ep-msi.c b/drivers/pci/endpoint/pci-ep-msi.c new file mode 100644 index 0000000000000..91207fb66db32 --- /dev/null +++ b/drivers/pci/endpoint/pci-ep-msi.c @@ -0,0 +1,128 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * PCI Endpoint *Controller* (EPC) MSI library + * + * Copyright (C) 2024 NXP + * Author: Frank Li + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +static irqreturn_t pci_epf_doorbell_handler(int irq, void *data) +{ + struct pci_epf *epf = data; + struct msi_desc *desc = irq_get_msi_desc(irq); + + if (desc && epf->event_ops && epf->event_ops->doorbell) + epf->event_ops->doorbell(epf, desc->msi_index); + + return IRQ_HANDLED; +} + +static bool pci_epc_match_parent(struct device *dev, void *param) +{ + return dev->parent == param; +} + +static void pci_epc_write_msi_msg(struct msi_desc *desc, struct msi_msg *msg) +{ + struct pci_epc *epc __free(pci_epc_put) = NULL; + struct pci_epf *epf; + + epc = pci_epc_get_fn(pci_epc_match_parent, desc->dev); + if (!epc) + return; + + /* Only support one EPF for doorbell */ + epf = list_first_entry_or_null(&epc->pci_epf, struct pci_epf, list); + + if (epf && epf->db_msg && desc->msi_index < epf->num_db) + memcpy(&epf->db_msg[desc->msi_index].msg, msg, sizeof(*msg)); +} + +static void pci_epc_free_doorbell(struct pci_epc *epc, struct pci_epf *epf) +{ + int i; + + guard(mutex)(&epc->lock); + + for (i = 0; i < epf->num_db && epf->db_msg[i].virq; i++) { + free_irq(epf->db_msg[i].virq, epf); + epf->db_msg[i].virq = 0; + kfree(epf->db_msg[i].name); + epf->db_msg[i].name = NULL; + } + + platform_device_msi_free_irqs_all(epc->dev.parent); +} + +static int pci_epc_alloc_doorbell(struct pci_epc *epc, struct pci_epf *epf) +{ + struct device *dev = epc->dev.parent; + u16 num_db = epf->num_db; + int i = 0; + int ret; + + guard(mutex)(&epc->lock); + + ret = platform_device_msi_init_and_alloc_irqs(dev, num_db, pci_epc_write_msi_msg); + if (ret) { + dev_err(dev, "Failed to allocate MSI\n"); + return -ENOMEM; + } + + for (i = 0; i < num_db; i++) { + epf->db_msg[i].virq = msi_get_virq(dev, i); + epf->db_msg[i].name = kasprintf(GFP_KERNEL, "pci-epc-doorbell%d", i); + ret = request_irq(epf->db_msg[i].virq, pci_epf_doorbell_handler, 0, + epf->db_msg[i].name, epf); + if (ret) { + dev_err(dev, "Failed to request doorbell\n"); + pci_epc_free_doorbell(epc, epf); + return ret; + } + } + + return 0; +}; + +int pci_epf_alloc_doorbell(struct pci_epf *epf, u16 num_db) +{ + struct pci_epc *epc = epf->epc; + void *msg; + int ret; + + msg = kcalloc(num_db, sizeof(struct pci_epf_doorbell_msg), GFP_KERNEL); + if (!msg) + return -ENOMEM; + + epf->num_db = num_db; + epf->db_msg = msg; + + ret = pci_epc_alloc_doorbell(epc, epf); + if (ret) + kfree(msg); + + return ret; +} +EXPORT_SYMBOL_GPL(pci_epf_alloc_doorbell); + +void pci_epf_free_doorbell(struct pci_epf *epf) +{ + struct pci_epc *epc = epf->epc; + + pci_epc_free_doorbell(epc, epf); + + kfree(epf->db_msg); + epf->db_msg = NULL; + epf->num_db = 0; +} +EXPORT_SYMBOL_GPL(pci_epf_free_doorbell); diff --git a/include/linux/pci-ep-msi.h b/include/linux/pci-ep-msi.h new file mode 100644 index 0000000000000..f0cfecf491199 --- /dev/null +++ b/include/linux/pci-ep-msi.h @@ -0,0 +1,15 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * PCI Endpoint *Function* side MSI header file + * + * Copyright (C) 2024 NXP + * Author: Frank Li + */ + +#ifndef __PCI_EP_MSI__ +#define __PCI_EP_MSI__ + +int pci_epf_alloc_doorbell(struct pci_epf *epf, u16 nums); +void pci_epf_free_doorbell(struct pci_epf *epf); + +#endif /* __PCI_EP_MSI__ */ diff --git a/include/linux/pci-epf.h b/include/linux/pci-epf.h index 18a3aeb62ae4e..50c0f877f2efb 100644 --- a/include/linux/pci-epf.h +++ b/include/linux/pci-epf.h @@ -12,6 +12,7 @@ #include #include #include +#include #include struct pci_epf; @@ -75,6 +76,7 @@ struct pci_epf_ops { * @link_up: Callback for the EPC link up event * @link_down: Callback for the EPC link down event * @bus_master_enable: Callback for the EPC Bus Master Enable event + * @doorbell: Callback for EPC receive MSI from RC side */ struct pci_epc_event_ops { int (*epc_init)(struct pci_epf *epf); @@ -82,6 +84,7 @@ struct pci_epc_event_ops { int (*link_up)(struct pci_epf *epf); int (*link_down)(struct pci_epf *epf); int (*bus_master_enable)(struct pci_epf *epf); + int (*doorbell)(struct pci_epf *epf, int index); }; /** @@ -125,6 +128,18 @@ struct pci_epf_bar { int flags; }; +/** + * struct pci_epf_doorbell_msg - represents doorbell message + * @msi_msg: MSI message + * @virq: irq number of this doorbell MSI message + * @name: irq name for doorbell interrupt + */ +struct pci_epf_doorbell_msg { + struct msi_msg msg; 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Use pci_epf_alloc_doorbell() to allocate a doorbell address space. Enable the Root Complex (RC) side driver to trigger pci-epc-test's doorbell callback handler by writing doorbell_data to the mapped doorbell_bar's address space. Set doorbell_done in the doorbell callback to indicate completion. To avoid broken compatibility, add new command COMMAND_ENABLE_DOORBELL and COMMAND_DISABLE_DOORBELL. Host side need send COMMAND_ENABLE_DOORBELL to map one bar's inbound address to MSI space. the command COMMAND_DISABLE_DOORBELL to recovery original inbound address mapping. Host side new driver Host side old driver EP: new driver S F EP: old driver F F S: If EP side support MSI, 'pcitest -B' return success. If EP side doesn't support MSI, the same to 'F'. F: 'pcitest -B' return failure, other case as usual. Signed-off-by: Frank Li --- change from v3 to v4 - remove revid requirement - Add command COMMAND_ENABLE_DOORBELL and COMMAND_DISABLE_DOORBELL. - call pci_epc_set_bar() to map inbound address to MSI space only at COMMAND_ENABLE_DOORBELL. --- drivers/pci/endpoint/functions/pci-epf-test.c | 104 ++++++++++++++++++++++++++ 1 file changed, 104 insertions(+) diff --git a/drivers/pci/endpoint/functions/pci-epf-test.c b/drivers/pci/endpoint/functions/pci-epf-test.c index 7c2ed6eae53ad..dcb69921497fd 100644 --- a/drivers/pci/endpoint/functions/pci-epf-test.c +++ b/drivers/pci/endpoint/functions/pci-epf-test.c @@ -11,12 +11,14 @@ #include #include #include +#include #include #include #include #include #include +#include #include #define IRQ_TYPE_INTX 0 @@ -29,6 +31,8 @@ #define COMMAND_READ BIT(3) #define COMMAND_WRITE BIT(4) #define COMMAND_COPY BIT(5) +#define COMMAND_ENABLE_DOORBELL BIT(6) +#define COMMAND_DISABLE_DOORBELL BIT(7) #define STATUS_READ_SUCCESS BIT(0) #define STATUS_READ_FAIL BIT(1) @@ -39,6 +43,11 @@ #define STATUS_IRQ_RAISED BIT(6) #define STATUS_SRC_ADDR_INVALID BIT(7) #define STATUS_DST_ADDR_INVALID BIT(8) +#define STATUS_DOORBELL_SUCCESS BIT(9) +#define STATUS_DOORBELL_ENABLE_SUCCESS BIT(10) +#define STATUS_DOORBELL_ENABLE_FAIL BIT(11) +#define STATUS_DOORBELL_DISABLE_SUCCESS BIT(12) +#define STATUS_DOORBELL_DISABLE_FAIL BIT(13) #define FLAG_USE_DMA BIT(0) @@ -74,6 +83,9 @@ struct pci_epf_test_reg { u32 irq_type; u32 irq_number; u32 flags; + u32 doorbell_bar; + u32 doorbell_addr; + u32 doorbell_data; } __packed; static struct pci_epf_header test_header = { @@ -630,6 +642,60 @@ static void pci_epf_test_raise_irq(struct pci_epf_test *epf_test, } } +static void pci_epf_enable_doorbell(struct pci_epf_test *epf_test, struct pci_epf_test_reg *reg) +{ + enum pci_barno bar = reg->doorbell_bar; + struct pci_epf *epf = epf_test->epf; + struct pci_epc *epc = epf->epc; + struct pci_epf_bar db_bar; + struct msi_msg *msg; + u64 doorbell_addr; + u32 align; + int ret; + + align = epf_test->epc_features->align; + align = align ? align : 128; + + if (bar < BAR_0 || bar == epf_test->test_reg_bar || !epf->db_msg) { + reg->status |= STATUS_DOORBELL_ENABLE_FAIL; + return; + } + + msg = &epf->db_msg[0].msg; + doorbell_addr = msg->address_hi; + doorbell_addr <<= 32; + doorbell_addr |= msg->address_lo; + + db_bar.phys_addr = round_down(doorbell_addr, align); + db_bar.barno = bar; + db_bar.size = epf->bar[bar].size; + db_bar.flags = epf->bar[bar].flags; + db_bar.addr = NULL; + + ret = pci_epc_set_bar(epc, epf->func_no, epf->vfunc_no, &db_bar); + if (!ret) + reg->status |= STATUS_DOORBELL_ENABLE_SUCCESS; +} + +static void pci_epf_disable_doorbell(struct pci_epf_test *epf_test, struct pci_epf_test_reg *reg) +{ + enum pci_barno bar = reg->doorbell_bar; + struct pci_epf *epf = epf_test->epf; + struct pci_epc *epc = epf->epc; + int ret; + + if (bar < BAR_0 || bar == epf_test->test_reg_bar || !epf->db_msg) { + reg->status |= STATUS_DOORBELL_DISABLE_FAIL; + return; + } + + ret = pci_epc_set_bar(epc, epf->func_no, epf->vfunc_no, &epf->bar[bar]); + if (ret) + reg->status |= STATUS_DOORBELL_DISABLE_FAIL; + else + reg->status |= STATUS_DOORBELL_DISABLE_SUCCESS; +} + static void pci_epf_test_cmd_handler(struct work_struct *work) { u32 command; @@ -676,6 +742,14 @@ static void pci_epf_test_cmd_handler(struct work_struct *work) pci_epf_test_copy(epf_test, reg); pci_epf_test_raise_irq(epf_test, reg); break; + case COMMAND_ENABLE_DOORBELL: + pci_epf_enable_doorbell(epf_test, reg); + pci_epf_test_raise_irq(epf_test, reg); + break; + case COMMAND_DISABLE_DOORBELL: + pci_epf_disable_doorbell(epf_test, reg); + pci_epf_test_raise_irq(epf_test, reg); + break; default: dev_err(dev, "Invalid command 0x%x\n", command); break; @@ -810,11 +884,24 @@ static int pci_epf_test_link_down(struct pci_epf *epf) return 0; } +static int pci_epf_test_doorbell(struct pci_epf *epf, int index) +{ + struct pci_epf_test *epf_test = epf_get_drvdata(epf); + enum pci_barno test_reg_bar = epf_test->test_reg_bar; + struct pci_epf_test_reg *reg = epf_test->reg[test_reg_bar]; + + reg->status |= STATUS_DOORBELL_SUCCESS; + pci_epf_test_raise_irq(epf_test, reg); + + return 0; +} + static const struct pci_epc_event_ops pci_epf_test_event_ops = { .epc_init = pci_epf_test_epc_init, .epc_deinit = pci_epf_test_epc_deinit, .link_up = pci_epf_test_link_up, .link_down = pci_epf_test_link_down, + .doorbell = pci_epf_test_doorbell, }; static int pci_epf_test_alloc_space(struct pci_epf *epf) @@ -909,6 +996,23 @@ static int pci_epf_test_bind(struct pci_epf *epf) if (ret) return ret; + ret = pci_epf_alloc_doorbell(epf, 1); + if (!ret) { + struct pci_epf_test_reg *reg = epf_test->reg[test_reg_bar]; + struct msi_msg *msg = &epf->db_msg[0].msg; + u32 align = epc_features->align; + u64 doorbell_addr; + + align = align ? align : 128; + doorbell_addr = msg->address_hi; + doorbell_addr <<= 32; + doorbell_addr |= msg->address_lo; + + reg->doorbell_addr = doorbell_addr & (align - 1); + reg->doorbell_data = msg->data; + reg->doorbell_bar = pci_epc_get_next_free_bar(epc_features, test_reg_bar + 1); + } + return 0; } From patchwork Thu Oct 31 16:27:03 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Frank Li X-Patchwork-Id: 13858180 Received: from EUR05-VI1-obe.outbound.protection.outlook.com (mail-vi1eur05on2045.outbound.protection.outlook.com [40.107.21.45]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id EBA4E1C9DCD; 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Trigger the doorbell by writing data from PCI_ENDPOINT_TEST_DB_DATA to the address provided by PCI_ENDPOINT_TEST_DB_ADDR and wait for endpoint feedback. Add two command to COMMAND_ENABLE_DOORBELL and COMMAND_DISABLE_DOORBELL to enable EP side's doorbell support and avoid compatible problem. Host side new driver Host side old driver EP: new driver S F EP: old driver F F S: If EP side support MSI, 'pcitest -B' return success. If EP side doesn't support MSI, the same to 'F'. F: 'pcitest -B' return failure, other case as usual. Signed-off-by: Frank Li --- change from v3 to v4 - Add COMMAND_ENABLE_DOORBELL and COMMAND_DISABLE_DOORBELL. - Remove new DID requirement. --- drivers/misc/pci_endpoint_test.c | 63 ++++++++++++++++++++++++++++++++++++++++ include/uapi/linux/pcitest.h | 1 + 2 files changed, 64 insertions(+) diff --git a/drivers/misc/pci_endpoint_test.c b/drivers/misc/pci_endpoint_test.c index 3aaaf47fa4ee2..d8193626c8965 100644 --- a/drivers/misc/pci_endpoint_test.c +++ b/drivers/misc/pci_endpoint_test.c @@ -42,6 +42,8 @@ #define COMMAND_READ BIT(3) #define COMMAND_WRITE BIT(4) #define COMMAND_COPY BIT(5) +#define COMMAND_ENABLE_DOORBELL BIT(6) +#define COMMAND_DISABLE_DOORBELL BIT(7) #define PCI_ENDPOINT_TEST_STATUS 0x8 #define STATUS_READ_SUCCESS BIT(0) @@ -53,6 +55,11 @@ #define STATUS_IRQ_RAISED BIT(6) #define STATUS_SRC_ADDR_INVALID BIT(7) #define STATUS_DST_ADDR_INVALID BIT(8) +#define STATUS_DOORBELL_SUCCESS BIT(9) +#define STATUS_DOORBELL_ENABLE_SUCCESS BIT(10) +#define STATUS_DOORBELL_ENABLE_FAIL BIT(11) +#define STATUS_DOORBELL_DISABLE_SUCCESS BIT(12) +#define STATUS_DOORBELL_DISABLE_FAIL BIT(13) #define PCI_ENDPOINT_TEST_LOWER_SRC_ADDR 0x0c #define PCI_ENDPOINT_TEST_UPPER_SRC_ADDR 0x10 @@ -67,7 +74,12 @@ #define PCI_ENDPOINT_TEST_IRQ_NUMBER 0x28 #define PCI_ENDPOINT_TEST_FLAGS 0x2c +#define PCI_ENDPOINT_TEST_DB_BAR 0x30 +#define PCI_ENDPOINT_TEST_DB_ADDR 0x34 +#define PCI_ENDPOINT_TEST_DB_DATA 0x38 + #define FLAG_USE_DMA BIT(0) +#define FLAG_SUPPORT_DOORBELL BIT(1) #define PCI_DEVICE_ID_TI_AM654 0xb00c #define PCI_DEVICE_ID_TI_J7200 0xb00f @@ -75,6 +87,7 @@ #define PCI_DEVICE_ID_TI_J721S2 0xb013 #define PCI_DEVICE_ID_LS1088A 0x80c0 #define PCI_DEVICE_ID_IMX8 0x0808 +#define PCI_DEVICE_ID_IMX8_DB 0x080c #define is_am654_pci_dev(pdev) \ ((pdev)->device == PCI_DEVICE_ID_TI_AM654) @@ -108,6 +121,7 @@ enum pci_barno { BAR_3, BAR_4, BAR_5, + NO_BAR = -1, }; struct pci_endpoint_test { @@ -746,6 +760,52 @@ static bool pci_endpoint_test_set_irq(struct pci_endpoint_test *test, return false; } +static bool pci_endpoint_test_doorbell(struct pci_endpoint_test *test) +{ + enum pci_barno bar; + u32 data, status; + u32 addr; + + pci_endpoint_test_writel(test, PCI_ENDPOINT_TEST_COMMAND, + COMMAND_ENABLE_DOORBELL); + + wait_for_completion_timeout(&test->irq_raised, msecs_to_jiffies(1000)); + + status = pci_endpoint_test_readl(test, PCI_ENDPOINT_TEST_STATUS); + if (status & STATUS_DOORBELL_ENABLE_FAIL) + return false; + + data = pci_endpoint_test_readl(test, PCI_ENDPOINT_TEST_DB_DATA); + addr = pci_endpoint_test_readl(test, PCI_ENDPOINT_TEST_DB_ADDR); + bar = pci_endpoint_test_readl(test, PCI_ENDPOINT_TEST_DB_BAR); + + pci_endpoint_test_writel(test, PCI_ENDPOINT_TEST_IRQ_TYPE, irq_type); + pci_endpoint_test_writel(test, PCI_ENDPOINT_TEST_IRQ_NUMBER, 1); + + pci_endpoint_test_writel(test, PCI_ENDPOINT_TEST_STATUS, 0); + + bar = pci_endpoint_test_readl(test, PCI_ENDPOINT_TEST_DB_BAR); + + writel(data, test->bar[bar] + addr); + + wait_for_completion_timeout(&test->irq_raised, msecs_to_jiffies(1000)); + + status = pci_endpoint_test_readl(test, PCI_ENDPOINT_TEST_STATUS); + + pci_endpoint_test_writel(test, PCI_ENDPOINT_TEST_COMMAND, + COMMAND_DISABLE_DOORBELL); + + wait_for_completion_timeout(&test->irq_raised, msecs_to_jiffies(1000)); + + status |= pci_endpoint_test_readl(test, PCI_ENDPOINT_TEST_STATUS); + + if ((status & STATUS_DOORBELL_SUCCESS) && + (status & STATUS_DOORBELL_DISABLE_SUCCESS)) + return true; + + return false; +} + static long pci_endpoint_test_ioctl(struct file *file, unsigned int cmd, unsigned long arg) { @@ -793,6 +853,9 @@ static long pci_endpoint_test_ioctl(struct file *file, unsigned int cmd, case PCITEST_CLEAR_IRQ: ret = pci_endpoint_test_clear_irq(test); break; + case PCITEST_DOORBELL: + ret = pci_endpoint_test_doorbell(test); + break; } ret: diff --git a/include/uapi/linux/pcitest.h b/include/uapi/linux/pcitest.h index 94b46b043b536..06d9f548b510e 100644 --- a/include/uapi/linux/pcitest.h +++ b/include/uapi/linux/pcitest.h @@ -21,6 +21,7 @@ #define PCITEST_SET_IRQTYPE _IOW('P', 0x8, int) #define PCITEST_GET_IRQTYPE _IO('P', 0x9) #define PCITEST_CLEAR_IRQ _IO('P', 0x10) +#define PCITEST_DOORBELL _IO('P', 0x11) #define PCITEST_FLAGS_USE_DMA 0x00000001 From patchwork Thu Oct 31 16:27:04 2024 Content-Type: text/plain; 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Signed-off-by: Frank Li --- Change from v3 to v4 - none --- tools/pci/pcitest.c | 16 +++++++++++++++- 1 file changed, 15 insertions(+), 1 deletion(-) diff --git a/tools/pci/pcitest.c b/tools/pci/pcitest.c index 470258009ddc2..bbe26ebbfd945 100644 --- a/tools/pci/pcitest.c +++ b/tools/pci/pcitest.c @@ -34,6 +34,7 @@ struct pci_test { bool copy; unsigned long size; bool use_dma; + bool doorbell; }; static int run_test(struct pci_test *test) @@ -147,6 +148,15 @@ static int run_test(struct pci_test *test) fprintf(stdout, "%s\n", result[ret]); } + if (test->doorbell) { + ret = ioctl(fd, PCITEST_DOORBELL, 0); + fprintf(stdout, "Ringing doorbell on the EP\t\t"); + if (ret < 0) + fprintf(stdout, "TEST FAILED\n"); + else + fprintf(stdout, "%s\n", result[ret]); + } + fflush(stdout); close(fd); return (ret < 0) ? ret : 1 - ret; /* return 0 if test succeeded */ @@ -172,7 +182,7 @@ int main(int argc, char **argv) /* set default endpoint device */ test->device = "/dev/pci-endpoint-test.0"; - while ((c = getopt(argc, argv, "D:b:m:x:i:deIlhrwcs:")) != EOF) + while ((c = getopt(argc, argv, "D:b:m:x:i:BdeIlhrwcs:")) != EOF) switch (c) { case 'D': test->device = optarg; @@ -222,6 +232,9 @@ int main(int argc, char **argv) case 'd': test->use_dma = true; continue; + case 'B': + test->doorbell = true; + continue; case 'h': default: usage: @@ -241,6 +254,7 @@ int main(int argc, char **argv) "\t-w Write buffer test\n" "\t-c Copy buffer test\n" "\t-s Size of buffer {default: 100KB}\n" + "\t-B Doorbell test\n" "\t-h Print this help message\n", argv[0]); return -EINVAL;