Adds a new endpoint function driver (to program the virtual test device) making use of the EP-core library. Signed-off-by: Kishon Vijay Abraham I <kishon@xxxxxx> --- drivers/pci/endpoint/Kconfig | 2 + drivers/pci/endpoint/Makefile | 2 +- drivers/pci/endpoint/functions/Kconfig | 12 + drivers/pci/endpoint/functions/Makefile | 5 + drivers/pci/endpoint/functions/pci-epf-test.c | 510 +++++++++++++++++++++++++ 5 files changed, 530 insertions(+), 1 deletion(-) create mode 100644 drivers/pci/endpoint/functions/Kconfig create mode 100644 drivers/pci/endpoint/functions/Makefile create mode 100644 drivers/pci/endpoint/functions/pci-epf-test.c diff --git a/drivers/pci/endpoint/Kconfig b/drivers/pci/endpoint/Kconfig index c86bca9..c23f146 100644 --- a/drivers/pci/endpoint/Kconfig +++ b/drivers/pci/endpoint/Kconfig @@ -26,4 +26,6 @@ config PCI_ENDPOINT_CONFIGFS configure the endpoint function and used to bind the function with a endpoint controller. +source "drivers/pci/endpoint/functions/Kconfig" + endmenu diff --git a/drivers/pci/endpoint/Makefile b/drivers/pci/endpoint/Makefile index 7219d51..1041f80 100644 --- a/drivers/pci/endpoint/Makefile +++ b/drivers/pci/endpoint/Makefile @@ -4,4 +4,4 @@ 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 + pci-epc-mem.o functions/ diff --git a/drivers/pci/endpoint/functions/Kconfig b/drivers/pci/endpoint/functions/Kconfig new file mode 100644 index 0000000..175edad --- /dev/null +++ b/drivers/pci/endpoint/functions/Kconfig @@ -0,0 +1,12 @@ +# +# PCI Endpoint Functions +# + +config PCI_EPF_TEST + tristate "PCI Endpoint Test driver" + depends on PCI_ENDPOINT + help + Enable this configuration option to enable the test driver + for PCI Endpoint. + + If in doubt, say "N" to disable Endpoint test driver. diff --git a/drivers/pci/endpoint/functions/Makefile b/drivers/pci/endpoint/functions/Makefile new file mode 100644 index 0000000..6d94a48 --- /dev/null +++ b/drivers/pci/endpoint/functions/Makefile @@ -0,0 +1,5 @@ +# +# Makefile for PCI Endpoint Functions +# + +obj-$(CONFIG_PCI_EPF_TEST) += pci-epf-test.o diff --git a/drivers/pci/endpoint/functions/pci-epf-test.c b/drivers/pci/endpoint/functions/pci-epf-test.c new file mode 100644 index 0000000..d6a7a12 --- /dev/null +++ b/drivers/pci/endpoint/functions/pci-epf-test.c @@ -0,0 +1,510 @@ +/** + * Test driver to test endpoint functionality + * + * Copyright (C) 2017 Texas Instruments + * Author: Kishon Vijay Abraham I <kishon@xxxxxx> + * + * This program is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 of + * the License as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ + +#include <linux/crc32.h> +#include <linux/delay.h> +#include <linux/io.h> +#include <linux/module.h> +#include <linux/slab.h> +#include <linux/pci_ids.h> +#include <linux/random.h> + +#include <linux/pci-epc.h> +#include <linux/pci-epf.h> +#include <linux/pci_regs.h> + +#define COMMAND_RAISE_LEGACY_IRQ BIT(0) +#define COMMAND_RAISE_MSI_IRQ BIT(1) +#define MSI_NUMBER_SHIFT 2 +#define MSI_NUMBER_MASK (0x3f << MSI_NUMBER_SHIFT) +#define COMMAND_READ BIT(8) +#define COMMAND_WRITE BIT(9) +#define COMMAND_COPY BIT(10) + +#define STATUS_READ_SUCCESS BIT(0) +#define STATUS_READ_FAIL BIT(1) +#define STATUS_WRITE_SUCCESS BIT(2) +#define STATUS_WRITE_FAIL BIT(3) +#define STATUS_COPY_SUCCESS BIT(4) +#define STATUS_COPY_FAIL BIT(5) +#define STATUS_IRQ_RAISED BIT(6) +#define STATUS_SRC_ADDR_INVALID BIT(7) +#define STATUS_DST_ADDR_INVALID BIT(8) + +#define TIMER_RESOLUTION 1 + +static struct workqueue_struct *kpcitest_workqueue; + +struct pci_epf_test { + void *reg[6]; + struct pci_epf *epf; + struct delayed_work cmd_handler; +}; + +struct pci_epf_test_reg { + u32 magic; + u32 command; + u32 status; + u64 src_addr; + u64 dst_addr; + u32 size; + u32 checksum; +} __packed; + +static struct pci_epf_header test_header = { + .vendorid = PCI_ANY_ID, + .deviceid = PCI_ANY_ID, + .baseclass_code = PCI_CLASS_OTHERS, + .interrupt_pin = PCI_INTERRUPT_INTA, +}; + +static int bar_size[] = { 512, 1024, 16384, 131072, 1048576 }; + +static int pci_epf_test_copy(struct pci_epf_test *epf_test) +{ + int ret; + void __iomem *src_addr; + void __iomem *dst_addr; + phys_addr_t src_phys_addr; + phys_addr_t dst_phys_addr; + struct pci_epf *epf = epf_test->epf; + struct device *dev = &epf->dev; + struct pci_epc *epc = epf->epc; + struct pci_epf_test_reg *reg = epf_test->reg[0]; + + src_addr = pci_epc_mem_alloc_addr(epc, &src_phys_addr, reg->size); + if (!src_addr) { + dev_err(dev, "failed to allocate source address\n"); + reg->status = STATUS_SRC_ADDR_INVALID; + ret = -ENOMEM; + goto err; + } + + ret = pci_epc_map_addr(epc, src_phys_addr, reg->src_addr, reg->size); + if (ret) { + dev_err(dev, "failed to map source address\n"); + reg->status = STATUS_SRC_ADDR_INVALID; + goto err_src_addr; + } + + dst_addr = pci_epc_mem_alloc_addr(epc, &dst_phys_addr, reg->size); + if (!dst_addr) { + dev_err(dev, "failed to allocate destination address\n"); + reg->status = STATUS_DST_ADDR_INVALID; + ret = -ENOMEM; + goto err_src_map_addr; + } + + ret = pci_epc_map_addr(epc, dst_phys_addr, reg->dst_addr, reg->size); + if (ret) { + dev_err(dev, "failed to map destination address\n"); + reg->status = STATUS_DST_ADDR_INVALID; + goto err_dst_addr; + } + + memcpy(dst_addr, src_addr, reg->size); + + pci_epc_unmap_addr(epc, dst_phys_addr); + +err_dst_addr: + pci_epc_mem_free_addr(epc, dst_phys_addr, dst_addr, reg->size); + +err_src_map_addr: + pci_epc_unmap_addr(epc, src_phys_addr); + +err_src_addr: + pci_epc_mem_free_addr(epc, src_phys_addr, src_addr, reg->size); + +err: + return ret; +} + +static int pci_epf_test_read(struct pci_epf_test *epf_test) +{ + int ret; + void __iomem *src_addr; + void *buf; + u32 crc32; + phys_addr_t phys_addr; + struct pci_epf *epf = epf_test->epf; + struct device *dev = &epf->dev; + struct pci_epc *epc = epf->epc; + struct pci_epf_test_reg *reg = epf_test->reg[0]; + + src_addr = pci_epc_mem_alloc_addr(epc, &phys_addr, reg->size); + if (!src_addr) { + dev_err(dev, "failed to allocate address\n"); + reg->status = STATUS_SRC_ADDR_INVALID; + ret = -ENOMEM; + goto err; + } + + ret = pci_epc_map_addr(epc, phys_addr, reg->src_addr, reg->size); + if (ret) { + dev_err(dev, "failed to map address\n"); + reg->status = STATUS_SRC_ADDR_INVALID; + goto err_addr; + } + + buf = kzalloc(reg->size, GFP_KERNEL); + if (!buf) { + ret = -ENOMEM; + goto err_map_addr; + } + + memcpy(buf, src_addr, reg->size); + + crc32 = crc32_le(~0, buf, reg->size); + if (crc32 != reg->checksum) + ret = -EIO; + + kfree(buf); + +err_map_addr: + pci_epc_unmap_addr(epc, phys_addr); + +err_addr: + pci_epc_mem_free_addr(epc, phys_addr, src_addr, reg->size); + +err: + return ret; +} + +static int pci_epf_test_write(struct pci_epf_test *epf_test) +{ + int ret; + void __iomem *dst_addr; + void *buf; + phys_addr_t phys_addr; + struct pci_epf *epf = epf_test->epf; + struct device *dev = &epf->dev; + struct pci_epc *epc = epf->epc; + struct pci_epf_test_reg *reg = epf_test->reg[0]; + + dst_addr = pci_epc_mem_alloc_addr(epc, &phys_addr, reg->size); + if (!dst_addr) { + dev_err(dev, "failed to allocate address\n"); + reg->status = STATUS_DST_ADDR_INVALID; + ret = -ENOMEM; + goto err; + } + + ret = pci_epc_map_addr(epc, phys_addr, reg->dst_addr, reg->size); + if (ret) { + dev_err(dev, "failed to map address\n"); + reg->status = STATUS_DST_ADDR_INVALID; + goto err_addr; + } + + buf = kzalloc(reg->size, GFP_KERNEL); + if (!buf) { + ret = -ENOMEM; + goto err_map_addr; + } + + get_random_bytes(buf, reg->size); + reg->checksum = crc32_le(~0, buf, reg->size); + + memcpy(dst_addr, buf, reg->size); + + /* + * wait 1ms inorder for the write to complete. Without this delay L3 + * error in observed in the host system. + */ + mdelay(1); + + kfree(buf); + +err_map_addr: + pci_epc_unmap_addr(epc, phys_addr); + +err_addr: + pci_epc_mem_free_addr(epc, phys_addr, dst_addr, reg->size); + +err: + return ret; +} + +static void pci_epf_test_raise_irq(struct pci_epf_test *epf_test) +{ + u8 irq; + u8 msi_count; + struct pci_epf *epf = epf_test->epf; + struct pci_epc *epc = epf->epc; + struct pci_epf_test_reg *reg = epf_test->reg[0]; + + reg->status |= STATUS_IRQ_RAISED; + msi_count = pci_epc_get_msi(epc); + irq = (reg->command & MSI_NUMBER_MASK) >> MSI_NUMBER_SHIFT; + if (irq > msi_count || msi_count <= 0) + pci_epc_raise_irq(epc, PCI_EPC_IRQ_LEGACY, 0); + else + pci_epc_raise_irq(epc, PCI_EPC_IRQ_MSI, irq); +} + +static void pci_epf_test_cmd_handler(struct work_struct *work) +{ + int ret; + u8 irq; + u8 msi_count; + struct pci_epf_test *epf_test = container_of(work, struct pci_epf_test, + cmd_handler.work); + struct pci_epf *epf = epf_test->epf; + struct pci_epc *epc = epf->epc; + struct pci_epf_test_reg *reg = epf_test->reg[0]; + + if (!reg->command) + goto reset_handler; + + if (reg->command & COMMAND_RAISE_LEGACY_IRQ) { + reg->status = STATUS_IRQ_RAISED; + pci_epc_raise_irq(epc, PCI_EPC_IRQ_LEGACY, 0); + goto reset_handler; + } + + if (reg->command & COMMAND_WRITE) { + ret = pci_epf_test_write(epf_test); + if (ret) + reg->status |= STATUS_WRITE_FAIL; + else + reg->status |= STATUS_WRITE_SUCCESS; + pci_epf_test_raise_irq(epf_test); + goto reset_handler; + } + + if (reg->command & COMMAND_READ) { + ret = pci_epf_test_read(epf_test); + if (!ret) + reg->status |= STATUS_READ_SUCCESS; + else + reg->status |= STATUS_READ_FAIL; + pci_epf_test_raise_irq(epf_test); + goto reset_handler; + } + + if (reg->command & COMMAND_COPY) { + ret = pci_epf_test_copy(epf_test); + if (!ret) + reg->status |= STATUS_COPY_SUCCESS; + else + reg->status |= STATUS_COPY_FAIL; + pci_epf_test_raise_irq(epf_test); + goto reset_handler; + } + + if (reg->command & COMMAND_RAISE_MSI_IRQ) { + msi_count = pci_epc_get_msi(epc); + irq = (reg->command & MSI_NUMBER_MASK) >> MSI_NUMBER_SHIFT; + if (irq > msi_count || msi_count <= 0) + goto reset_handler; + reg->status = STATUS_IRQ_RAISED; + pci_epc_raise_irq(epc, PCI_EPC_IRQ_MSI, irq); + goto reset_handler; + } + +reset_handler: + reg->command = 0; + + queue_delayed_work(kpcitest_workqueue, &epf_test->cmd_handler, + msecs_to_jiffies(1)); +} + +static void pci_epf_test_linkup(struct pci_epf *epf) +{ + struct pci_epf_test *epf_test = epf_get_drvdata(epf); + + queue_delayed_work(kpcitest_workqueue, &epf_test->cmd_handler, + msecs_to_jiffies(1)); +} + +static void pci_epf_test_unbind(struct pci_epf *epf) +{ + struct pci_epf_test *epf_test = epf_get_drvdata(epf); + struct pci_epc *epc = epf->epc; + int bar; + + cancel_delayed_work(&epf_test->cmd_handler); + pci_epc_stop(epc); + for (bar = BAR_0; bar <= BAR_5; bar++) { + if (epf_test->reg[bar]) { + pci_epf_free_space(epf, epf_test->reg[bar], bar); + pci_epc_clear_bar(epc, bar); + } + } +} + +static int pci_epf_test_set_bar(struct pci_epf *epf) +{ + int flags; + int bar; + int ret; + struct pci_epf_bar *epf_bar; + struct pci_epc *epc = epf->epc; + struct device *dev = &epf->dev; + struct pci_epf_test *epf_test = epf_get_drvdata(epf); + + flags = PCI_BASE_ADDRESS_SPACE_MEMORY | PCI_BASE_ADDRESS_MEM_TYPE_32; + if (sizeof(dma_addr_t) == 0x8) + flags |= PCI_BASE_ADDRESS_MEM_TYPE_64; + + for (bar = BAR_0; bar <= BAR_5; bar++) { + epf_bar = &epf->bar[bar]; + ret = pci_epc_set_bar(epc, bar, epf_bar->phys_addr, + epf_bar->size, flags); + if (ret) { + pci_epf_free_space(epf, epf_test->reg[bar], bar); + dev_err(dev, "failed to set BAR%d\n", bar); + if (bar == BAR_0) + return ret; + } + } + + return 0; +} + +static int pci_epf_test_alloc_space(struct pci_epf *epf) +{ + struct pci_epf_test *epf_test = epf_get_drvdata(epf); + struct device *dev = &epf->dev; + void *base; + int bar; + + base = pci_epf_alloc_space(epf, sizeof(struct pci_epf_test_reg), + BAR_0); + if (!base) { + dev_err(dev, "failed to allocated register space\n"); + return -ENOMEM; + } + epf_test->reg[0] = base; + + for (bar = BAR_1; bar <= BAR_5; bar++) { + base = pci_epf_alloc_space(epf, bar_size[bar - 1], bar); + if (!base) + dev_err(dev, "failed to allocate space for BAR%d\n", + bar); + epf_test->reg[bar] = base; + } + + return 0; +} + +static int pci_epf_test_bind(struct pci_epf *epf) +{ + int ret; + struct pci_epf_header *header = epf->header; + struct pci_epc *epc = epf->epc; + struct device *dev = &epf->dev; + + if (WARN_ON_ONCE(!epc)) + return -EINVAL; + + ret = pci_epc_write_header(epc, header); + if (ret) { + dev_err(dev, "configuration header write failed\n"); + return ret; + } + + ret = pci_epf_test_alloc_space(epf); + if (ret) + return ret; + + ret = pci_epf_test_set_bar(epf); + if (ret) + return ret; + + ret = pci_epc_set_msi(epc, epf->msi_interrupts); + if (ret) + return ret; + + return 0; +} + +static int pci_epf_test_probe(struct pci_epf *epf) +{ + struct pci_epf_test *epf_test; + struct device *dev = &epf->dev; + + epf_test = devm_kzalloc(dev, sizeof(*epf_test), GFP_KERNEL); + if (!epf) + return -ENOMEM; + + epf->header = &test_header; + epf_test->epf = epf; + + INIT_DELAYED_WORK(&epf_test->cmd_handler, pci_epf_test_cmd_handler); + + epf_set_drvdata(epf, epf_test); + return 0; +} + +static int pci_epf_test_remove(struct pci_epf *epf) +{ + struct pci_epf_test *epf_test = epf_get_drvdata(epf); + + kfree(epf_test); + return 0; +} + +static struct pci_epf_ops ops = { + .unbind = pci_epf_test_unbind, + .bind = pci_epf_test_bind, + .linkup = pci_epf_test_linkup, +}; + +static const struct pci_epf_device_id pci_epf_test_ids[] = { + { + .name = "pci_epf_test", + }, + {}, +}; + +static struct pci_epf_driver test_driver = { + .driver.name = "pci_epf_test", + .probe = pci_epf_test_probe, + .remove = pci_epf_test_remove, + .id_table = pci_epf_test_ids, + .ops = &ops, + .owner = THIS_MODULE, +}; + +static int __init pci_epf_test_init(void) +{ + int ret; + + kpcitest_workqueue = alloc_workqueue("kpcitest", + WQ_MEM_RECLAIM | WQ_HIGHPRI, 0); + ret = pci_epf_register_driver(&test_driver); + if (ret) { + pr_err("failed to register pci epf test driver --> %d\n", ret); + return ret; + } + + return 0; +} +module_init(pci_epf_test_init); + +static void __exit pci_epf_test_exit(void) +{ + pci_epf_unregister_driver(&test_driver); +} +module_exit(pci_epf_test_exit); + +MODULE_DESCRIPTION("PCI EPF TEST DRIVER"); +MODULE_AUTHOR("Kishon Vijay Abraham I <kishon@xxxxxx>"); +MODULE_LICENSE("GPL v2"); -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
