[Feature] add GA346 baseline version
Change-Id: Ic62933698569507dcf98240cdf5d9931ae34348f
diff --git a/src/kernel/linux/v4.19/drivers/fpga/dfl-afu-dma-region.c b/src/kernel/linux/v4.19/drivers/fpga/dfl-afu-dma-region.c
new file mode 100644
index 0000000..c9a613d
--- /dev/null
+++ b/src/kernel/linux/v4.19/drivers/fpga/dfl-afu-dma-region.c
@@ -0,0 +1,463 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Driver for FPGA Accelerated Function Unit (AFU) DMA Region Management
+ *
+ * Copyright (C) 2017-2018 Intel Corporation, Inc.
+ *
+ * Authors:
+ * Wu Hao <hao.wu@intel.com>
+ * Xiao Guangrong <guangrong.xiao@linux.intel.com>
+ */
+
+#include <linux/dma-mapping.h>
+#include <linux/sched/signal.h>
+#include <linux/uaccess.h>
+
+#include "dfl-afu.h"
+
+static void put_all_pages(struct page **pages, int npages)
+{
+ int i;
+
+ for (i = 0; i < npages; i++)
+ if (pages[i])
+ put_page(pages[i]);
+}
+
+void afu_dma_region_init(struct dfl_feature_platform_data *pdata)
+{
+ struct dfl_afu *afu = dfl_fpga_pdata_get_private(pdata);
+
+ afu->dma_regions = RB_ROOT;
+}
+
+/**
+ * afu_dma_adjust_locked_vm - adjust locked memory
+ * @dev: port device
+ * @npages: number of pages
+ * @incr: increase or decrease locked memory
+ *
+ * Increase or decrease the locked memory size with npages input.
+ *
+ * Return 0 on success.
+ * Return -ENOMEM if locked memory size is over the limit and no CAP_IPC_LOCK.
+ */
+static int afu_dma_adjust_locked_vm(struct device *dev, long npages, bool incr)
+{
+ unsigned long locked, lock_limit;
+ int ret = 0;
+
+ /* the task is exiting. */
+ if (!current->mm)
+ return 0;
+
+ down_write(¤t->mm->mmap_sem);
+
+ if (incr) {
+ locked = current->mm->locked_vm + npages;
+ lock_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT;
+
+ if (locked > lock_limit && !capable(CAP_IPC_LOCK))
+ ret = -ENOMEM;
+ else
+ current->mm->locked_vm += npages;
+ } else {
+ if (WARN_ON_ONCE(npages > current->mm->locked_vm))
+ npages = current->mm->locked_vm;
+ current->mm->locked_vm -= npages;
+ }
+
+ dev_dbg(dev, "[%d] RLIMIT_MEMLOCK %c%ld %ld/%ld%s\n", current->pid,
+ incr ? '+' : '-', npages << PAGE_SHIFT,
+ current->mm->locked_vm << PAGE_SHIFT, rlimit(RLIMIT_MEMLOCK),
+ ret ? "- execeeded" : "");
+
+ up_write(¤t->mm->mmap_sem);
+
+ return ret;
+}
+
+/**
+ * afu_dma_pin_pages - pin pages of given dma memory region
+ * @pdata: feature device platform data
+ * @region: dma memory region to be pinned
+ *
+ * Pin all the pages of given dfl_afu_dma_region.
+ * Return 0 for success or negative error code.
+ */
+static int afu_dma_pin_pages(struct dfl_feature_platform_data *pdata,
+ struct dfl_afu_dma_region *region)
+{
+ int npages = region->length >> PAGE_SHIFT;
+ struct device *dev = &pdata->dev->dev;
+ int ret, pinned;
+
+ ret = afu_dma_adjust_locked_vm(dev, npages, true);
+ if (ret)
+ return ret;
+
+ region->pages = kcalloc(npages, sizeof(struct page *), GFP_KERNEL);
+ if (!region->pages) {
+ ret = -ENOMEM;
+ goto unlock_vm;
+ }
+
+ pinned = get_user_pages_fast(region->user_addr, npages, 1,
+ region->pages);
+ if (pinned < 0) {
+ ret = pinned;
+ goto put_pages;
+ } else if (pinned != npages) {
+ ret = -EFAULT;
+ goto free_pages;
+ }
+
+ dev_dbg(dev, "%d pages pinned\n", pinned);
+
+ return 0;
+
+put_pages:
+ put_all_pages(region->pages, pinned);
+free_pages:
+ kfree(region->pages);
+unlock_vm:
+ afu_dma_adjust_locked_vm(dev, npages, false);
+ return ret;
+}
+
+/**
+ * afu_dma_unpin_pages - unpin pages of given dma memory region
+ * @pdata: feature device platform data
+ * @region: dma memory region to be unpinned
+ *
+ * Unpin all the pages of given dfl_afu_dma_region.
+ * Return 0 for success or negative error code.
+ */
+static void afu_dma_unpin_pages(struct dfl_feature_platform_data *pdata,
+ struct dfl_afu_dma_region *region)
+{
+ long npages = region->length >> PAGE_SHIFT;
+ struct device *dev = &pdata->dev->dev;
+
+ put_all_pages(region->pages, npages);
+ kfree(region->pages);
+ afu_dma_adjust_locked_vm(dev, npages, false);
+
+ dev_dbg(dev, "%ld pages unpinned\n", npages);
+}
+
+/**
+ * afu_dma_check_continuous_pages - check if pages are continuous
+ * @region: dma memory region
+ *
+ * Return true if pages of given dma memory region have continuous physical
+ * address, otherwise return false.
+ */
+static bool afu_dma_check_continuous_pages(struct dfl_afu_dma_region *region)
+{
+ int npages = region->length >> PAGE_SHIFT;
+ int i;
+
+ for (i = 0; i < npages - 1; i++)
+ if (page_to_pfn(region->pages[i]) + 1 !=
+ page_to_pfn(region->pages[i + 1]))
+ return false;
+
+ return true;
+}
+
+/**
+ * dma_region_check_iova - check if memory area is fully contained in the region
+ * @region: dma memory region
+ * @iova: address of the dma memory area
+ * @size: size of the dma memory area
+ *
+ * Compare the dma memory area defined by @iova and @size with given dma region.
+ * Return true if memory area is fully contained in the region, otherwise false.
+ */
+static bool dma_region_check_iova(struct dfl_afu_dma_region *region,
+ u64 iova, u64 size)
+{
+ if (!size && region->iova != iova)
+ return false;
+
+ return (region->iova <= iova) &&
+ (region->length + region->iova >= iova + size);
+}
+
+/**
+ * afu_dma_region_add - add given dma region to rbtree
+ * @pdata: feature device platform data
+ * @region: dma region to be added
+ *
+ * Return 0 for success, -EEXIST if dma region has already been added.
+ *
+ * Needs to be called with pdata->lock heold.
+ */
+static int afu_dma_region_add(struct dfl_feature_platform_data *pdata,
+ struct dfl_afu_dma_region *region)
+{
+ struct dfl_afu *afu = dfl_fpga_pdata_get_private(pdata);
+ struct rb_node **new, *parent = NULL;
+
+ dev_dbg(&pdata->dev->dev, "add region (iova = %llx)\n",
+ (unsigned long long)region->iova);
+
+ new = &afu->dma_regions.rb_node;
+
+ while (*new) {
+ struct dfl_afu_dma_region *this;
+
+ this = container_of(*new, struct dfl_afu_dma_region, node);
+
+ parent = *new;
+
+ if (dma_region_check_iova(this, region->iova, region->length))
+ return -EEXIST;
+
+ if (region->iova < this->iova)
+ new = &((*new)->rb_left);
+ else if (region->iova > this->iova)
+ new = &((*new)->rb_right);
+ else
+ return -EEXIST;
+ }
+
+ rb_link_node(®ion->node, parent, new);
+ rb_insert_color(®ion->node, &afu->dma_regions);
+
+ return 0;
+}
+
+/**
+ * afu_dma_region_remove - remove given dma region from rbtree
+ * @pdata: feature device platform data
+ * @region: dma region to be removed
+ *
+ * Needs to be called with pdata->lock heold.
+ */
+static void afu_dma_region_remove(struct dfl_feature_platform_data *pdata,
+ struct dfl_afu_dma_region *region)
+{
+ struct dfl_afu *afu;
+
+ dev_dbg(&pdata->dev->dev, "del region (iova = %llx)\n",
+ (unsigned long long)region->iova);
+
+ afu = dfl_fpga_pdata_get_private(pdata);
+ rb_erase(®ion->node, &afu->dma_regions);
+}
+
+/**
+ * afu_dma_region_destroy - destroy all regions in rbtree
+ * @pdata: feature device platform data
+ *
+ * Needs to be called with pdata->lock heold.
+ */
+void afu_dma_region_destroy(struct dfl_feature_platform_data *pdata)
+{
+ struct dfl_afu *afu = dfl_fpga_pdata_get_private(pdata);
+ struct rb_node *node = rb_first(&afu->dma_regions);
+ struct dfl_afu_dma_region *region;
+
+ while (node) {
+ region = container_of(node, struct dfl_afu_dma_region, node);
+
+ dev_dbg(&pdata->dev->dev, "del region (iova = %llx)\n",
+ (unsigned long long)region->iova);
+
+ rb_erase(node, &afu->dma_regions);
+
+ if (region->iova)
+ dma_unmap_page(dfl_fpga_pdata_to_parent(pdata),
+ region->iova, region->length,
+ DMA_BIDIRECTIONAL);
+
+ if (region->pages)
+ afu_dma_unpin_pages(pdata, region);
+
+ node = rb_next(node);
+ kfree(region);
+ }
+}
+
+/**
+ * afu_dma_region_find - find the dma region from rbtree based on iova and size
+ * @pdata: feature device platform data
+ * @iova: address of the dma memory area
+ * @size: size of the dma memory area
+ *
+ * It finds the dma region from the rbtree based on @iova and @size:
+ * - if @size == 0, it finds the dma region which starts from @iova
+ * - otherwise, it finds the dma region which fully contains
+ * [@iova, @iova+size)
+ * If nothing is matched returns NULL.
+ *
+ * Needs to be called with pdata->lock held.
+ */
+struct dfl_afu_dma_region *
+afu_dma_region_find(struct dfl_feature_platform_data *pdata, u64 iova, u64 size)
+{
+ struct dfl_afu *afu = dfl_fpga_pdata_get_private(pdata);
+ struct rb_node *node = afu->dma_regions.rb_node;
+ struct device *dev = &pdata->dev->dev;
+
+ while (node) {
+ struct dfl_afu_dma_region *region;
+
+ region = container_of(node, struct dfl_afu_dma_region, node);
+
+ if (dma_region_check_iova(region, iova, size)) {
+ dev_dbg(dev, "find region (iova = %llx)\n",
+ (unsigned long long)region->iova);
+ return region;
+ }
+
+ if (iova < region->iova)
+ node = node->rb_left;
+ else if (iova > region->iova)
+ node = node->rb_right;
+ else
+ /* the iova region is not fully covered. */
+ break;
+ }
+
+ dev_dbg(dev, "region with iova %llx and size %llx is not found\n",
+ (unsigned long long)iova, (unsigned long long)size);
+
+ return NULL;
+}
+
+/**
+ * afu_dma_region_find_iova - find the dma region from rbtree by iova
+ * @pdata: feature device platform data
+ * @iova: address of the dma region
+ *
+ * Needs to be called with pdata->lock held.
+ */
+static struct dfl_afu_dma_region *
+afu_dma_region_find_iova(struct dfl_feature_platform_data *pdata, u64 iova)
+{
+ return afu_dma_region_find(pdata, iova, 0);
+}
+
+/**
+ * afu_dma_map_region - map memory region for dma
+ * @pdata: feature device platform data
+ * @user_addr: address of the memory region
+ * @length: size of the memory region
+ * @iova: pointer of iova address
+ *
+ * Map memory region defined by @user_addr and @length, and return dma address
+ * of the memory region via @iova.
+ * Return 0 for success, otherwise error code.
+ */
+int afu_dma_map_region(struct dfl_feature_platform_data *pdata,
+ u64 user_addr, u64 length, u64 *iova)
+{
+ struct dfl_afu_dma_region *region;
+ int ret;
+
+ /*
+ * Check Inputs, only accept page-aligned user memory region with
+ * valid length.
+ */
+ if (!PAGE_ALIGNED(user_addr) || !PAGE_ALIGNED(length) || !length)
+ return -EINVAL;
+
+ /* Check overflow */
+ if (user_addr + length < user_addr)
+ return -EINVAL;
+
+ if (!access_ok(VERIFY_WRITE, (void __user *)(unsigned long)user_addr,
+ length))
+ return -EINVAL;
+
+ region = kzalloc(sizeof(*region), GFP_KERNEL);
+ if (!region)
+ return -ENOMEM;
+
+ region->user_addr = user_addr;
+ region->length = length;
+
+ /* Pin the user memory region */
+ ret = afu_dma_pin_pages(pdata, region);
+ if (ret) {
+ dev_err(&pdata->dev->dev, "failed to pin memory region\n");
+ goto free_region;
+ }
+
+ /* Only accept continuous pages, return error else */
+ if (!afu_dma_check_continuous_pages(region)) {
+ dev_err(&pdata->dev->dev, "pages are not continuous\n");
+ ret = -EINVAL;
+ goto unpin_pages;
+ }
+
+ /* As pages are continuous then start to do DMA mapping */
+ region->iova = dma_map_page(dfl_fpga_pdata_to_parent(pdata),
+ region->pages[0], 0,
+ region->length,
+ DMA_BIDIRECTIONAL);
+ if (dma_mapping_error(dfl_fpga_pdata_to_parent(pdata), region->iova)) {
+ dev_err(&pdata->dev->dev, "failed to map for dma\n");
+ ret = -EFAULT;
+ goto unpin_pages;
+ }
+
+ *iova = region->iova;
+
+ mutex_lock(&pdata->lock);
+ ret = afu_dma_region_add(pdata, region);
+ mutex_unlock(&pdata->lock);
+ if (ret) {
+ dev_err(&pdata->dev->dev, "failed to add dma region\n");
+ goto unmap_dma;
+ }
+
+ return 0;
+
+unmap_dma:
+ dma_unmap_page(dfl_fpga_pdata_to_parent(pdata),
+ region->iova, region->length, DMA_BIDIRECTIONAL);
+unpin_pages:
+ afu_dma_unpin_pages(pdata, region);
+free_region:
+ kfree(region);
+ return ret;
+}
+
+/**
+ * afu_dma_unmap_region - unmap dma memory region
+ * @pdata: feature device platform data
+ * @iova: dma address of the region
+ *
+ * Unmap dma memory region based on @iova.
+ * Return 0 for success, otherwise error code.
+ */
+int afu_dma_unmap_region(struct dfl_feature_platform_data *pdata, u64 iova)
+{
+ struct dfl_afu_dma_region *region;
+
+ mutex_lock(&pdata->lock);
+ region = afu_dma_region_find_iova(pdata, iova);
+ if (!region) {
+ mutex_unlock(&pdata->lock);
+ return -EINVAL;
+ }
+
+ if (region->in_use) {
+ mutex_unlock(&pdata->lock);
+ return -EBUSY;
+ }
+
+ afu_dma_region_remove(pdata, region);
+ mutex_unlock(&pdata->lock);
+
+ dma_unmap_page(dfl_fpga_pdata_to_parent(pdata),
+ region->iova, region->length, DMA_BIDIRECTIONAL);
+ afu_dma_unpin_pages(pdata, region);
+ kfree(region);
+
+ return 0;
+}