summaryrefslogtreecommitdiffstats
path: root/drivers/pci/endpoint/functions/pci-epf-test.c
diff options
context:
space:
mode:
authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
commitace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch)
treeb2d64bc10158fdd5497876388cd68142ca374ed3 /drivers/pci/endpoint/functions/pci-epf-test.c
parentInitial commit. (diff)
downloadlinux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz
linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/pci/endpoint/functions/pci-epf-test.c')
-rw-r--r--drivers/pci/endpoint/functions/pci-epf-test.c1021
1 files changed, 1021 insertions, 0 deletions
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 0000000000..1f0d2b8429
--- /dev/null
+++ b/drivers/pci/endpoint/functions/pci-epf-test.c
@@ -0,0 +1,1021 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Test driver to test endpoint functionality
+ *
+ * Copyright (C) 2017 Texas Instruments
+ * Author: Kishon Vijay Abraham I <kishon@ti.com>
+ */
+
+#include <linux/crc32.h>
+#include <linux/delay.h>
+#include <linux/dmaengine.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 IRQ_TYPE_LEGACY 0
+#define IRQ_TYPE_MSI 1
+#define IRQ_TYPE_MSIX 2
+
+#define COMMAND_RAISE_LEGACY_IRQ BIT(0)
+#define COMMAND_RAISE_MSI_IRQ BIT(1)
+#define COMMAND_RAISE_MSIX_IRQ BIT(2)
+#define COMMAND_READ BIT(3)
+#define COMMAND_WRITE BIT(4)
+#define COMMAND_COPY BIT(5)
+
+#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 FLAG_USE_DMA BIT(0)
+
+#define TIMER_RESOLUTION 1
+
+static struct workqueue_struct *kpcitest_workqueue;
+
+struct pci_epf_test {
+ void *reg[PCI_STD_NUM_BARS];
+ struct pci_epf *epf;
+ enum pci_barno test_reg_bar;
+ size_t msix_table_offset;
+ struct delayed_work cmd_handler;
+ struct dma_chan *dma_chan_tx;
+ struct dma_chan *dma_chan_rx;
+ struct dma_chan *transfer_chan;
+ dma_cookie_t transfer_cookie;
+ enum dma_status transfer_status;
+ struct completion transfer_complete;
+ bool dma_supported;
+ bool dma_private;
+ const struct pci_epc_features *epc_features;
+};
+
+struct pci_epf_test_reg {
+ u32 magic;
+ u32 command;
+ u32 status;
+ u64 src_addr;
+ u64 dst_addr;
+ u32 size;
+ u32 checksum;
+ u32 irq_type;
+ u32 irq_number;
+ u32 flags;
+} __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 size_t bar_size[] = { 512, 512, 1024, 16384, 131072, 1048576 };
+
+static void pci_epf_test_dma_callback(void *param)
+{
+ struct pci_epf_test *epf_test = param;
+ struct dma_tx_state state;
+
+ epf_test->transfer_status =
+ dmaengine_tx_status(epf_test->transfer_chan,
+ epf_test->transfer_cookie, &state);
+ if (epf_test->transfer_status == DMA_COMPLETE ||
+ epf_test->transfer_status == DMA_ERROR)
+ complete(&epf_test->transfer_complete);
+}
+
+/**
+ * pci_epf_test_data_transfer() - Function that uses dmaengine API to transfer
+ * data between PCIe EP and remote PCIe RC
+ * @epf_test: the EPF test device that performs the data transfer operation
+ * @dma_dst: The destination address of the data transfer. It can be a physical
+ * address given by pci_epc_mem_alloc_addr or DMA mapping APIs.
+ * @dma_src: The source address of the data transfer. It can be a physical
+ * address given by pci_epc_mem_alloc_addr or DMA mapping APIs.
+ * @len: The size of the data transfer
+ * @dma_remote: remote RC physical address
+ * @dir: DMA transfer direction
+ *
+ * Function that uses dmaengine API to transfer data between PCIe EP and remote
+ * PCIe RC. The source and destination address can be a physical address given
+ * by pci_epc_mem_alloc_addr or the one obtained using DMA mapping APIs.
+ *
+ * The function returns '0' on success and negative value on failure.
+ */
+static int pci_epf_test_data_transfer(struct pci_epf_test *epf_test,
+ dma_addr_t dma_dst, dma_addr_t dma_src,
+ size_t len, dma_addr_t dma_remote,
+ enum dma_transfer_direction dir)
+{
+ struct dma_chan *chan = (dir == DMA_MEM_TO_DEV) ?
+ epf_test->dma_chan_tx : epf_test->dma_chan_rx;
+ dma_addr_t dma_local = (dir == DMA_MEM_TO_DEV) ? dma_src : dma_dst;
+ enum dma_ctrl_flags flags = DMA_CTRL_ACK | DMA_PREP_INTERRUPT;
+ struct pci_epf *epf = epf_test->epf;
+ struct dma_async_tx_descriptor *tx;
+ struct dma_slave_config sconf = {};
+ struct device *dev = &epf->dev;
+ int ret;
+
+ if (IS_ERR_OR_NULL(chan)) {
+ dev_err(dev, "Invalid DMA memcpy channel\n");
+ return -EINVAL;
+ }
+
+ if (epf_test->dma_private) {
+ sconf.direction = dir;
+ if (dir == DMA_MEM_TO_DEV)
+ sconf.dst_addr = dma_remote;
+ else
+ sconf.src_addr = dma_remote;
+
+ if (dmaengine_slave_config(chan, &sconf)) {
+ dev_err(dev, "DMA slave config fail\n");
+ return -EIO;
+ }
+ tx = dmaengine_prep_slave_single(chan, dma_local, len, dir,
+ flags);
+ } else {
+ tx = dmaengine_prep_dma_memcpy(chan, dma_dst, dma_src, len,
+ flags);
+ }
+
+ if (!tx) {
+ dev_err(dev, "Failed to prepare DMA memcpy\n");
+ return -EIO;
+ }
+
+ reinit_completion(&epf_test->transfer_complete);
+ epf_test->transfer_chan = chan;
+ tx->callback = pci_epf_test_dma_callback;
+ tx->callback_param = epf_test;
+ epf_test->transfer_cookie = dmaengine_submit(tx);
+
+ ret = dma_submit_error(epf_test->transfer_cookie);
+ if (ret) {
+ dev_err(dev, "Failed to do DMA tx_submit %d\n", ret);
+ goto terminate;
+ }
+
+ dma_async_issue_pending(chan);
+ ret = wait_for_completion_interruptible(&epf_test->transfer_complete);
+ if (ret < 0) {
+ dev_err(dev, "DMA wait_for_completion interrupted\n");
+ goto terminate;
+ }
+
+ if (epf_test->transfer_status == DMA_ERROR) {
+ dev_err(dev, "DMA transfer failed\n");
+ ret = -EIO;
+ }
+
+terminate:
+ dmaengine_terminate_sync(chan);
+
+ return ret;
+}
+
+struct epf_dma_filter {
+ struct device *dev;
+ u32 dma_mask;
+};
+
+static bool epf_dma_filter_fn(struct dma_chan *chan, void *node)
+{
+ struct epf_dma_filter *filter = node;
+ struct dma_slave_caps caps;
+
+ memset(&caps, 0, sizeof(caps));
+ dma_get_slave_caps(chan, &caps);
+
+ return chan->device->dev == filter->dev
+ && (filter->dma_mask & caps.directions);
+}
+
+/**
+ * pci_epf_test_init_dma_chan() - Function to initialize EPF test DMA channel
+ * @epf_test: the EPF test device that performs data transfer operation
+ *
+ * Function to initialize EPF test DMA channel.
+ */
+static int pci_epf_test_init_dma_chan(struct pci_epf_test *epf_test)
+{
+ struct pci_epf *epf = epf_test->epf;
+ struct device *dev = &epf->dev;
+ struct epf_dma_filter filter;
+ struct dma_chan *dma_chan;
+ dma_cap_mask_t mask;
+ int ret;
+
+ filter.dev = epf->epc->dev.parent;
+ filter.dma_mask = BIT(DMA_DEV_TO_MEM);
+
+ dma_cap_zero(mask);
+ dma_cap_set(DMA_SLAVE, mask);
+ dma_chan = dma_request_channel(mask, epf_dma_filter_fn, &filter);
+ if (!dma_chan) {
+ dev_info(dev, "Failed to get private DMA rx channel. Falling back to generic one\n");
+ goto fail_back_tx;
+ }
+
+ epf_test->dma_chan_rx = dma_chan;
+
+ filter.dma_mask = BIT(DMA_MEM_TO_DEV);
+ dma_chan = dma_request_channel(mask, epf_dma_filter_fn, &filter);
+
+ if (!dma_chan) {
+ dev_info(dev, "Failed to get private DMA tx channel. Falling back to generic one\n");
+ goto fail_back_rx;
+ }
+
+ epf_test->dma_chan_tx = dma_chan;
+ epf_test->dma_private = true;
+
+ init_completion(&epf_test->transfer_complete);
+
+ return 0;
+
+fail_back_rx:
+ dma_release_channel(epf_test->dma_chan_rx);
+ epf_test->dma_chan_tx = NULL;
+
+fail_back_tx:
+ dma_cap_zero(mask);
+ dma_cap_set(DMA_MEMCPY, mask);
+
+ dma_chan = dma_request_chan_by_mask(&mask);
+ if (IS_ERR(dma_chan)) {
+ ret = PTR_ERR(dma_chan);
+ if (ret != -EPROBE_DEFER)
+ dev_err(dev, "Failed to get DMA channel\n");
+ return ret;
+ }
+ init_completion(&epf_test->transfer_complete);
+
+ epf_test->dma_chan_tx = epf_test->dma_chan_rx = dma_chan;
+
+ return 0;
+}
+
+/**
+ * pci_epf_test_clean_dma_chan() - Function to cleanup EPF test DMA channel
+ * @epf_test: the EPF test device that performs data transfer operation
+ *
+ * Helper to cleanup EPF test DMA channel.
+ */
+static void pci_epf_test_clean_dma_chan(struct pci_epf_test *epf_test)
+{
+ if (!epf_test->dma_supported)
+ return;
+
+ dma_release_channel(epf_test->dma_chan_tx);
+ if (epf_test->dma_chan_tx == epf_test->dma_chan_rx) {
+ epf_test->dma_chan_tx = NULL;
+ epf_test->dma_chan_rx = NULL;
+ return;
+ }
+
+ dma_release_channel(epf_test->dma_chan_rx);
+ epf_test->dma_chan_rx = NULL;
+
+ return;
+}
+
+static void pci_epf_test_print_rate(struct pci_epf_test *epf_test,
+ const char *op, u64 size,
+ struct timespec64 *start,
+ struct timespec64 *end, bool dma)
+{
+ struct timespec64 ts = timespec64_sub(*end, *start);
+ u64 rate = 0, ns;
+
+ /* calculate the rate */
+ ns = timespec64_to_ns(&ts);
+ if (ns)
+ rate = div64_u64(size * NSEC_PER_SEC, ns * 1000);
+
+ dev_info(&epf_test->epf->dev,
+ "%s => Size: %llu B, DMA: %s, Time: %llu.%09u s, Rate: %llu KB/s\n",
+ op, size, dma ? "YES" : "NO",
+ (u64)ts.tv_sec, (u32)ts.tv_nsec, rate);
+}
+
+static void pci_epf_test_copy(struct pci_epf_test *epf_test,
+ struct pci_epf_test_reg *reg)
+{
+ int ret;
+ void __iomem *src_addr;
+ void __iomem *dst_addr;
+ phys_addr_t src_phys_addr;
+ phys_addr_t dst_phys_addr;
+ struct timespec64 start, end;
+ struct pci_epf *epf = epf_test->epf;
+ struct device *dev = &epf->dev;
+ struct pci_epc *epc = epf->epc;
+
+ 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, epf->func_no, epf->vfunc_no, 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, epf->func_no, epf->vfunc_no, 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;
+ }
+
+ ktime_get_ts64(&start);
+ if (reg->flags & FLAG_USE_DMA) {
+ if (epf_test->dma_private) {
+ dev_err(dev, "Cannot transfer data using DMA\n");
+ ret = -EINVAL;
+ goto err_map_addr;
+ }
+
+ ret = pci_epf_test_data_transfer(epf_test, dst_phys_addr,
+ src_phys_addr, reg->size, 0,
+ DMA_MEM_TO_MEM);
+ if (ret)
+ dev_err(dev, "Data transfer failed\n");
+ } else {
+ void *buf;
+
+ buf = kzalloc(reg->size, GFP_KERNEL);
+ if (!buf) {
+ ret = -ENOMEM;
+ goto err_map_addr;
+ }
+
+ memcpy_fromio(buf, src_addr, reg->size);
+ memcpy_toio(dst_addr, buf, reg->size);
+ kfree(buf);
+ }
+ ktime_get_ts64(&end);
+ pci_epf_test_print_rate(epf_test, "COPY", reg->size, &start, &end,
+ reg->flags & FLAG_USE_DMA);
+
+err_map_addr:
+ pci_epc_unmap_addr(epc, epf->func_no, epf->vfunc_no, 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, epf->func_no, epf->vfunc_no, src_phys_addr);
+
+err_src_addr:
+ pci_epc_mem_free_addr(epc, src_phys_addr, src_addr, reg->size);
+
+err:
+ if (!ret)
+ reg->status |= STATUS_COPY_SUCCESS;
+ else
+ reg->status |= STATUS_COPY_FAIL;
+}
+
+static void pci_epf_test_read(struct pci_epf_test *epf_test,
+ struct pci_epf_test_reg *reg)
+{
+ int ret;
+ void __iomem *src_addr;
+ void *buf;
+ u32 crc32;
+ phys_addr_t phys_addr;
+ phys_addr_t dst_phys_addr;
+ struct timespec64 start, end;
+ struct pci_epf *epf = epf_test->epf;
+ struct device *dev = &epf->dev;
+ struct pci_epc *epc = epf->epc;
+ struct device *dma_dev = epf->epc->dev.parent;
+
+ 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, epf->func_no, epf->vfunc_no, 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;
+ }
+
+ if (reg->flags & FLAG_USE_DMA) {
+ dst_phys_addr = dma_map_single(dma_dev, buf, reg->size,
+ DMA_FROM_DEVICE);
+ if (dma_mapping_error(dma_dev, dst_phys_addr)) {
+ dev_err(dev, "Failed to map destination buffer addr\n");
+ ret = -ENOMEM;
+ goto err_dma_map;
+ }
+
+ ktime_get_ts64(&start);
+ ret = pci_epf_test_data_transfer(epf_test, dst_phys_addr,
+ phys_addr, reg->size,
+ reg->src_addr, DMA_DEV_TO_MEM);
+ if (ret)
+ dev_err(dev, "Data transfer failed\n");
+ ktime_get_ts64(&end);
+
+ dma_unmap_single(dma_dev, dst_phys_addr, reg->size,
+ DMA_FROM_DEVICE);
+ } else {
+ ktime_get_ts64(&start);
+ memcpy_fromio(buf, src_addr, reg->size);
+ ktime_get_ts64(&end);
+ }
+
+ pci_epf_test_print_rate(epf_test, "READ", reg->size, &start, &end,
+ reg->flags & FLAG_USE_DMA);
+
+ crc32 = crc32_le(~0, buf, reg->size);
+ if (crc32 != reg->checksum)
+ ret = -EIO;
+
+err_dma_map:
+ kfree(buf);
+
+err_map_addr:
+ pci_epc_unmap_addr(epc, epf->func_no, epf->vfunc_no, phys_addr);
+
+err_addr:
+ pci_epc_mem_free_addr(epc, phys_addr, src_addr, reg->size);
+
+err:
+ if (!ret)
+ reg->status |= STATUS_READ_SUCCESS;
+ else
+ reg->status |= STATUS_READ_FAIL;
+}
+
+static void pci_epf_test_write(struct pci_epf_test *epf_test,
+ struct pci_epf_test_reg *reg)
+{
+ int ret;
+ void __iomem *dst_addr;
+ void *buf;
+ phys_addr_t phys_addr;
+ phys_addr_t src_phys_addr;
+ struct timespec64 start, end;
+ struct pci_epf *epf = epf_test->epf;
+ struct device *dev = &epf->dev;
+ struct pci_epc *epc = epf->epc;
+ struct device *dma_dev = epf->epc->dev.parent;
+
+ 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, epf->func_no, epf->vfunc_no, 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);
+
+ if (reg->flags & FLAG_USE_DMA) {
+ src_phys_addr = dma_map_single(dma_dev, buf, reg->size,
+ DMA_TO_DEVICE);
+ if (dma_mapping_error(dma_dev, src_phys_addr)) {
+ dev_err(dev, "Failed to map source buffer addr\n");
+ ret = -ENOMEM;
+ goto err_dma_map;
+ }
+
+ ktime_get_ts64(&start);
+
+ ret = pci_epf_test_data_transfer(epf_test, phys_addr,
+ src_phys_addr, reg->size,
+ reg->dst_addr,
+ DMA_MEM_TO_DEV);
+ if (ret)
+ dev_err(dev, "Data transfer failed\n");
+ ktime_get_ts64(&end);
+
+ dma_unmap_single(dma_dev, src_phys_addr, reg->size,
+ DMA_TO_DEVICE);
+ } else {
+ ktime_get_ts64(&start);
+ memcpy_toio(dst_addr, buf, reg->size);
+ ktime_get_ts64(&end);
+ }
+
+ pci_epf_test_print_rate(epf_test, "WRITE", reg->size, &start, &end,
+ reg->flags & FLAG_USE_DMA);
+
+ /*
+ * wait 1ms inorder for the write to complete. Without this delay L3
+ * error in observed in the host system.
+ */
+ usleep_range(1000, 2000);
+
+err_dma_map:
+ kfree(buf);
+
+err_map_addr:
+ pci_epc_unmap_addr(epc, epf->func_no, epf->vfunc_no, phys_addr);
+
+err_addr:
+ pci_epc_mem_free_addr(epc, phys_addr, dst_addr, reg->size);
+
+err:
+ if (!ret)
+ reg->status |= STATUS_WRITE_SUCCESS;
+ else
+ reg->status |= STATUS_WRITE_FAIL;
+}
+
+static void pci_epf_test_raise_irq(struct pci_epf_test *epf_test,
+ struct pci_epf_test_reg *reg)
+{
+ struct pci_epf *epf = epf_test->epf;
+ struct device *dev = &epf->dev;
+ struct pci_epc *epc = epf->epc;
+ u32 status = reg->status | STATUS_IRQ_RAISED;
+ int count;
+
+ /*
+ * Set the status before raising the IRQ to ensure that the host sees
+ * the updated value when it gets the IRQ.
+ */
+ WRITE_ONCE(reg->status, status);
+
+ switch (reg->irq_type) {
+ case IRQ_TYPE_LEGACY:
+ pci_epc_raise_irq(epc, epf->func_no, epf->vfunc_no,
+ PCI_EPC_IRQ_LEGACY, 0);
+ break;
+ case IRQ_TYPE_MSI:
+ count = pci_epc_get_msi(epc, epf->func_no, epf->vfunc_no);
+ if (reg->irq_number > count || count <= 0) {
+ dev_err(dev, "Invalid MSI IRQ number %d / %d\n",
+ reg->irq_number, count);
+ return;
+ }
+ pci_epc_raise_irq(epc, epf->func_no, epf->vfunc_no,
+ PCI_EPC_IRQ_MSI, reg->irq_number);
+ break;
+ case IRQ_TYPE_MSIX:
+ count = pci_epc_get_msix(epc, epf->func_no, epf->vfunc_no);
+ if (reg->irq_number > count || count <= 0) {
+ dev_err(dev, "Invalid MSIX IRQ number %d / %d\n",
+ reg->irq_number, count);
+ return;
+ }
+ pci_epc_raise_irq(epc, epf->func_no, epf->vfunc_no,
+ PCI_EPC_IRQ_MSIX, reg->irq_number);
+ break;
+ default:
+ dev_err(dev, "Failed to raise IRQ, unknown type\n");
+ break;
+ }
+}
+
+static void pci_epf_test_cmd_handler(struct work_struct *work)
+{
+ u32 command;
+ struct pci_epf_test *epf_test = container_of(work, struct pci_epf_test,
+ cmd_handler.work);
+ struct pci_epf *epf = epf_test->epf;
+ struct device *dev = &epf->dev;
+ enum pci_barno test_reg_bar = epf_test->test_reg_bar;
+ struct pci_epf_test_reg *reg = epf_test->reg[test_reg_bar];
+
+ command = READ_ONCE(reg->command);
+ if (!command)
+ goto reset_handler;
+
+ WRITE_ONCE(reg->command, 0);
+ WRITE_ONCE(reg->status, 0);
+
+ if ((READ_ONCE(reg->flags) & FLAG_USE_DMA) &&
+ !epf_test->dma_supported) {
+ dev_err(dev, "Cannot transfer data using DMA\n");
+ goto reset_handler;
+ }
+
+ if (reg->irq_type > IRQ_TYPE_MSIX) {
+ dev_err(dev, "Failed to detect IRQ type\n");
+ goto reset_handler;
+ }
+
+ switch (command) {
+ case COMMAND_RAISE_LEGACY_IRQ:
+ case COMMAND_RAISE_MSI_IRQ:
+ case COMMAND_RAISE_MSIX_IRQ:
+ pci_epf_test_raise_irq(epf_test, reg);
+ break;
+ case COMMAND_WRITE:
+ pci_epf_test_write(epf_test, reg);
+ pci_epf_test_raise_irq(epf_test, reg);
+ break;
+ case COMMAND_READ:
+ pci_epf_test_read(epf_test, reg);
+ pci_epf_test_raise_irq(epf_test, reg);
+ break;
+ case COMMAND_COPY:
+ pci_epf_test_copy(epf_test, reg);
+ pci_epf_test_raise_irq(epf_test, reg);
+ break;
+ default:
+ dev_err(dev, "Invalid command 0x%x\n", command);
+ break;
+ }
+
+reset_handler:
+ 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;
+ struct pci_epf_bar *epf_bar;
+ int bar;
+
+ cancel_delayed_work(&epf_test->cmd_handler);
+ pci_epf_test_clean_dma_chan(epf_test);
+ for (bar = 0; bar < PCI_STD_NUM_BARS; bar++) {
+ epf_bar = &epf->bar[bar];
+
+ if (epf_test->reg[bar]) {
+ pci_epc_clear_bar(epc, epf->func_no, epf->vfunc_no,
+ epf_bar);
+ pci_epf_free_space(epf, epf_test->reg[bar], bar,
+ PRIMARY_INTERFACE);
+ }
+ }
+}
+
+static int pci_epf_test_set_bar(struct pci_epf *epf)
+{
+ int bar, add;
+ 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);
+ enum pci_barno test_reg_bar = epf_test->test_reg_bar;
+ const struct pci_epc_features *epc_features;
+
+ epc_features = epf_test->epc_features;
+
+ for (bar = 0; bar < PCI_STD_NUM_BARS; bar += add) {
+ epf_bar = &epf->bar[bar];
+ /*
+ * pci_epc_set_bar() sets PCI_BASE_ADDRESS_MEM_TYPE_64
+ * if the specific implementation required a 64-bit BAR,
+ * even if we only requested a 32-bit BAR.
+ */
+ add = (epf_bar->flags & PCI_BASE_ADDRESS_MEM_TYPE_64) ? 2 : 1;
+
+ if (!!(epc_features->reserved_bar & (1 << bar)))
+ continue;
+
+ ret = pci_epc_set_bar(epc, epf->func_no, epf->vfunc_no,
+ epf_bar);
+ if (ret) {
+ pci_epf_free_space(epf, epf_test->reg[bar], bar,
+ PRIMARY_INTERFACE);
+ dev_err(dev, "Failed to set BAR%d\n", bar);
+ if (bar == test_reg_bar)
+ return ret;
+ }
+ }
+
+ return 0;
+}
+
+static int pci_epf_test_core_init(struct pci_epf *epf)
+{
+ struct pci_epf_test *epf_test = epf_get_drvdata(epf);
+ struct pci_epf_header *header = epf->header;
+ const struct pci_epc_features *epc_features;
+ struct pci_epc *epc = epf->epc;
+ struct device *dev = &epf->dev;
+ bool msix_capable = false;
+ bool msi_capable = true;
+ int ret;
+
+ epc_features = pci_epc_get_features(epc, epf->func_no, epf->vfunc_no);
+ if (epc_features) {
+ msix_capable = epc_features->msix_capable;
+ msi_capable = epc_features->msi_capable;
+ }
+
+ if (epf->vfunc_no <= 1) {
+ ret = pci_epc_write_header(epc, epf->func_no, epf->vfunc_no, header);
+ if (ret) {
+ dev_err(dev, "Configuration header write failed\n");
+ return ret;
+ }
+ }
+
+ ret = pci_epf_test_set_bar(epf);
+ if (ret)
+ return ret;
+
+ if (msi_capable) {
+ ret = pci_epc_set_msi(epc, epf->func_no, epf->vfunc_no,
+ epf->msi_interrupts);
+ if (ret) {
+ dev_err(dev, "MSI configuration failed\n");
+ return ret;
+ }
+ }
+
+ if (msix_capable) {
+ ret = pci_epc_set_msix(epc, epf->func_no, epf->vfunc_no,
+ epf->msix_interrupts,
+ epf_test->test_reg_bar,
+ epf_test->msix_table_offset);
+ if (ret) {
+ dev_err(dev, "MSI-X configuration failed\n");
+ return ret;
+ }
+ }
+
+ return 0;
+}
+
+static int pci_epf_test_link_up(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));
+
+ return 0;
+}
+
+static const struct pci_epc_event_ops pci_epf_test_event_ops = {
+ .core_init = pci_epf_test_core_init,
+ .link_up = pci_epf_test_link_up,
+};
+
+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;
+ struct pci_epf_bar *epf_bar;
+ size_t msix_table_size = 0;
+ size_t test_reg_bar_size;
+ size_t pba_size = 0;
+ bool msix_capable;
+ void *base;
+ int bar, add;
+ enum pci_barno test_reg_bar = epf_test->test_reg_bar;
+ const struct pci_epc_features *epc_features;
+ size_t test_reg_size;
+
+ epc_features = epf_test->epc_features;
+
+ test_reg_bar_size = ALIGN(sizeof(struct pci_epf_test_reg), 128);
+
+ msix_capable = epc_features->msix_capable;
+ if (msix_capable) {
+ msix_table_size = PCI_MSIX_ENTRY_SIZE * epf->msix_interrupts;
+ epf_test->msix_table_offset = test_reg_bar_size;
+ /* Align to QWORD or 8 Bytes */
+ pba_size = ALIGN(DIV_ROUND_UP(epf->msix_interrupts, 8), 8);
+ }
+ test_reg_size = test_reg_bar_size + msix_table_size + pba_size;
+
+ if (epc_features->bar_fixed_size[test_reg_bar]) {
+ if (test_reg_size > bar_size[test_reg_bar])
+ return -ENOMEM;
+ test_reg_size = bar_size[test_reg_bar];
+ }
+
+ base = pci_epf_alloc_space(epf, test_reg_size, test_reg_bar,
+ epc_features->align, PRIMARY_INTERFACE);
+ if (!base) {
+ dev_err(dev, "Failed to allocated register space\n");
+ return -ENOMEM;
+ }
+ epf_test->reg[test_reg_bar] = base;
+
+ for (bar = 0; bar < PCI_STD_NUM_BARS; bar += add) {
+ epf_bar = &epf->bar[bar];
+ add = (epf_bar->flags & PCI_BASE_ADDRESS_MEM_TYPE_64) ? 2 : 1;
+
+ if (bar == test_reg_bar)
+ continue;
+
+ if (!!(epc_features->reserved_bar & (1 << bar)))
+ continue;
+
+ base = pci_epf_alloc_space(epf, bar_size[bar], bar,
+ epc_features->align,
+ PRIMARY_INTERFACE);
+ if (!base)
+ dev_err(dev, "Failed to allocate space for BAR%d\n",
+ bar);
+ epf_test->reg[bar] = base;
+ }
+
+ return 0;
+}
+
+static void pci_epf_configure_bar(struct pci_epf *epf,
+ const struct pci_epc_features *epc_features)
+{
+ struct pci_epf_bar *epf_bar;
+ bool bar_fixed_64bit;
+ int i;
+
+ for (i = 0; i < PCI_STD_NUM_BARS; i++) {
+ epf_bar = &epf->bar[i];
+ bar_fixed_64bit = !!(epc_features->bar_fixed_64bit & (1 << i));
+ if (bar_fixed_64bit)
+ epf_bar->flags |= PCI_BASE_ADDRESS_MEM_TYPE_64;
+ if (epc_features->bar_fixed_size[i])
+ bar_size[i] = epc_features->bar_fixed_size[i];
+ }
+}
+
+static int pci_epf_test_bind(struct pci_epf *epf)
+{
+ int ret;
+ struct pci_epf_test *epf_test = epf_get_drvdata(epf);
+ const struct pci_epc_features *epc_features;
+ enum pci_barno test_reg_bar = BAR_0;
+ struct pci_epc *epc = epf->epc;
+ bool linkup_notifier = false;
+ bool core_init_notifier = false;
+
+ if (WARN_ON_ONCE(!epc))
+ return -EINVAL;
+
+ epc_features = pci_epc_get_features(epc, epf->func_no, epf->vfunc_no);
+ if (!epc_features) {
+ dev_err(&epf->dev, "epc_features not implemented\n");
+ return -EOPNOTSUPP;
+ }
+
+ linkup_notifier = epc_features->linkup_notifier;
+ core_init_notifier = epc_features->core_init_notifier;
+ test_reg_bar = pci_epc_get_first_free_bar(epc_features);
+ if (test_reg_bar < 0)
+ return -EINVAL;
+ pci_epf_configure_bar(epf, epc_features);
+
+ epf_test->test_reg_bar = test_reg_bar;
+ epf_test->epc_features = epc_features;
+
+ ret = pci_epf_test_alloc_space(epf);
+ if (ret)
+ return ret;
+
+ if (!core_init_notifier) {
+ ret = pci_epf_test_core_init(epf);
+ if (ret)
+ return ret;
+ }
+
+ epf_test->dma_supported = true;
+
+ ret = pci_epf_test_init_dma_chan(epf_test);
+ if (ret)
+ epf_test->dma_supported = false;
+
+ if (!linkup_notifier && !core_init_notifier)
+ queue_work(kpcitest_workqueue, &epf_test->cmd_handler.work);
+
+ return 0;
+}
+
+static const struct pci_epf_device_id pci_epf_test_ids[] = {
+ {
+ .name = "pci_epf_test",
+ },
+ {},
+};
+
+static int pci_epf_test_probe(struct pci_epf *epf,
+ const struct pci_epf_device_id *id)
+{
+ struct pci_epf_test *epf_test;
+ struct device *dev = &epf->dev;
+
+ epf_test = devm_kzalloc(dev, sizeof(*epf_test), GFP_KERNEL);
+ if (!epf_test)
+ return -ENOMEM;
+
+ epf->header = &test_header;
+ epf_test->epf = epf;
+
+ INIT_DELAYED_WORK(&epf_test->cmd_handler, pci_epf_test_cmd_handler);
+
+ epf->event_ops = &pci_epf_test_event_ops;
+
+ epf_set_drvdata(epf, epf_test);
+ return 0;
+}
+
+static struct pci_epf_ops ops = {
+ .unbind = pci_epf_test_unbind,
+ .bind = pci_epf_test_bind,
+};
+
+static struct pci_epf_driver test_driver = {
+ .driver.name = "pci_epf_test",
+ .probe = pci_epf_test_probe,
+ .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);
+ if (!kpcitest_workqueue) {
+ pr_err("Failed to allocate the kpcitest work queue\n");
+ return -ENOMEM;
+ }
+
+ ret = pci_epf_register_driver(&test_driver);
+ if (ret) {
+ destroy_workqueue(kpcitest_workqueue);
+ 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)
+{
+ if (kpcitest_workqueue)
+ destroy_workqueue(kpcitest_workqueue);
+ 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@ti.com>");
+MODULE_LICENSE("GPL v2");