@@ -6,6 +6,7 @@ obj-$(CONFIG_PDS_VFIO_PCI) += pds_vfio.o
pds_vfio-y := \
aux_drv.o \
cmds.o \
+ dirty.o \
lm.o \
pci_drv.o \
vfio_dev.o
@@ -340,3 +340,146 @@ pds_vfio_send_host_vf_lm_status_cmd(struct pds_vfio_pci_device *pds_vfio,
dev_warn(&pdev->dev, "failed to send host VF migration status: %pe\n",
ERR_PTR(err));
}
+
+int
+pds_vfio_dirty_status_cmd(struct pds_vfio_pci_device *pds_vfio,
+ u64 regions_dma, u8 *max_regions,
+ u8 *num_regions)
+{
+ struct pds_auxiliary_dev *padev = pds_vfio->vfio_aux->padev;
+ struct pds_lm_dirty_status_cmd cmd = {
+ .opcode = PDS_LM_CMD_DIRTY_STATUS,
+ .vf_id = cpu_to_le16(pds_vfio->vf_id),
+ };
+ struct pds_lm_dirty_status_comp comp = {0};
+ struct pci_dev *pdev = pds_vfio->pdev;
+ int err;
+
+ dev_dbg(&pdev->dev, "vf%u: Dirty status\n", pds_vfio->vf_id);
+
+ cmd.regions_dma = cpu_to_le64(regions_dma);
+ cmd.max_regions = *max_regions;
+
+ err = padev->ops->adminq_cmd(padev,
+ (union pds_core_adminq_cmd *)&cmd,
+ sizeof(cmd),
+ (union pds_core_adminq_comp *)&comp,
+ 0);
+ if (err) {
+ dev_err(&pdev->dev, "failed to get dirty status: %pe\n",
+ ERR_PTR(err));
+ return err;
+ }
+
+ /* only support seq_ack approach for now */
+ if (!(le32_to_cpu(comp.bmp_type_mask) &
+ BIT(PDS_LM_DIRTY_BMP_TYPE_SEQ_ACK))) {
+ dev_err(&pdev->dev, "Dirty bitmap tracking SEQ_ACK not supported\n");
+ return -EOPNOTSUPP;
+ }
+
+ *num_regions = comp.num_regions;
+ *max_regions = comp.max_regions;
+
+ dev_dbg(&pdev->dev, "Page Tracking Status command successful, max_regions: %d, num_regions: %d, bmp_type: %s\n",
+ *max_regions, *num_regions, "PDS_LM_DIRTY_BMP_TYPE_SEQ_ACK");
+
+ return 0;
+}
+
+int
+pds_vfio_dirty_enable_cmd(struct pds_vfio_pci_device *pds_vfio,
+ u64 regions_dma, u8 num_regions)
+{
+ struct pds_auxiliary_dev *padev = pds_vfio->vfio_aux->padev;
+ struct pds_lm_dirty_enable_cmd cmd = {
+ .opcode = PDS_LM_CMD_DIRTY_ENABLE,
+ .vf_id = cpu_to_le16(pds_vfio->vf_id),
+ };
+ struct pds_lm_dirty_status_comp comp = {0};
+ struct pci_dev *pdev = pds_vfio->pdev;
+ int err;
+
+ cmd.regions_dma = cpu_to_le64(regions_dma);
+ cmd.bmp_type = PDS_LM_DIRTY_BMP_TYPE_SEQ_ACK;
+ cmd.num_regions = num_regions;
+
+ err = padev->ops->adminq_cmd(padev,
+ (union pds_core_adminq_cmd *)&cmd,
+ sizeof(cmd),
+ (union pds_core_adminq_comp *)&comp,
+ 0);
+ if (err) {
+ dev_err(&pdev->dev, "failed dirty tracking enable: %pe\n",
+ ERR_PTR(err));
+ return err;
+ }
+
+ return 0;
+}
+
+int
+pds_vfio_dirty_disable_cmd(struct pds_vfio_pci_device *pds_vfio)
+{
+ struct pds_auxiliary_dev *padev = pds_vfio->vfio_aux->padev;
+ struct pds_lm_dirty_disable_cmd cmd = {
+ .opcode = PDS_LM_CMD_DIRTY_DISABLE,
+ .vf_id = cpu_to_le16(pds_vfio->vf_id),
+ };
+ struct pds_lm_dirty_status_comp comp = {0};
+ struct pci_dev *pdev = pds_vfio->pdev;
+ int err;
+
+ err = padev->ops->adminq_cmd(padev,
+ (union pds_core_adminq_cmd *)&cmd,
+ sizeof(cmd),
+ (union pds_core_adminq_comp *)&comp,
+ 0);
+ if (err || comp.num_regions != 0) {
+ /* in case num_regions is still non-zero after disable */
+ err = err ? err : -EIO;
+ dev_err(&pdev->dev, "failed dirty tracking disable: %pe, num_regions %d\n",
+ ERR_PTR(err), comp.num_regions);
+ return err;
+ }
+
+ return 0;
+}
+
+int
+pds_vfio_dirty_seq_ack_cmd(struct pds_vfio_pci_device *pds_vfio,
+ u64 sgl_dma, u16 num_sge, u32 offset,
+ u32 total_len, bool read_seq)
+{
+ const char *cmd_type_str = read_seq ? "read_seq" : "write_ack";
+ struct pds_auxiliary_dev *padev = pds_vfio->vfio_aux->padev;
+ struct pds_lm_dirty_seq_ack_cmd cmd = {
+ .vf_id = cpu_to_le16(pds_vfio->vf_id),
+ };
+ struct pci_dev *pdev = pds_vfio->pdev;
+ struct pds_lm_comp comp = {0};
+ int err;
+
+ if (read_seq)
+ cmd.opcode = PDS_LM_CMD_DIRTY_READ_SEQ;
+ else
+ cmd.opcode = PDS_LM_CMD_DIRTY_WRITE_ACK;
+
+ cmd.sgl_addr = cpu_to_le64(sgl_dma);
+ cmd.num_sge = cpu_to_le16(num_sge);
+ cmd.len_bytes = cpu_to_le32(total_len);
+ cmd.off_bytes = cpu_to_le32(offset);
+
+ err = padev->ops->adminq_cmd(padev,
+ (union pds_core_adminq_cmd *)&cmd,
+ sizeof(cmd),
+ (union pds_core_adminq_comp *)&comp,
+ 0);
+ if (err) {
+ dev_err(&pdev->dev, "failed cmd Page Tracking %s: %pe\n",
+ cmd_type_str, ERR_PTR(err));
+ return err;
+ }
+
+ return 0;
+}
@@ -4,6 +4,8 @@
#ifndef _CMDS_H_
#define _CMDS_H_
+#include <linux/types.h>
+
#include <linux/pds/pds_lm.h>
struct pds_vfio_pci_device;
@@ -25,5 +27,18 @@ pds_vfio_set_lm_state_cmd(struct pds_vfio_pci_device *pds_vfio);
void
pds_vfio_send_host_vf_lm_status_cmd(struct pds_vfio_pci_device *pds_vfio,
enum pds_lm_host_vf_status vf_status);
+int
+pds_vfio_dirty_status_cmd(struct pds_vfio_pci_device *pds_vfio,
+ u64 regions_dma, u8 *max_regions,
+ u8 *num_regions);
+int
+pds_vfio_dirty_enable_cmd(struct pds_vfio_pci_device *pds_vfio,
+ u64 regions_dma, u8 num_regions);
+int
+pds_vfio_dirty_disable_cmd(struct pds_vfio_pci_device *pds_vfio);
+int
+pds_vfio_dirty_seq_ack_cmd(struct pds_vfio_pci_device *pds_vfio,
+ u64 sgl_dma, u16 num_sge, u32 offset,
+ u32 total_len, bool read_seq);
#endif /* _CMDS_H_ */
new file mode 100644
@@ -0,0 +1,541 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright(c) 2023 Advanced Micro Devices, Inc. */
+
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/io.h>
+#include <linux/interval_tree.h>
+#include <linux/vfio.h>
+#include <linux/bitops.h>
+
+#include <linux/pds/pds_intr.h>
+#include <linux/pds/pds_core_if.h>
+#include <linux/pds/pds_adminq.h>
+#include <linux/pds/pds_auxbus.h>
+
+#include "cmds.h"
+#include "dirty.h"
+#include "vfio_dev.h"
+
+#define READ_SEQ true
+#define WRITE_ACK false
+
+bool
+pds_vfio_dirty_is_enabled(struct pds_vfio_pci_device *pds_vfio)
+{
+ return pds_vfio->dirty.is_enabled;
+}
+
+void
+pds_vfio_dirty_set_enabled(struct pds_vfio_pci_device *pds_vfio)
+{
+ pds_vfio->dirty.is_enabled = true;
+}
+
+void
+pds_vfio_dirty_set_disabled(struct pds_vfio_pci_device *pds_vfio)
+{
+ pds_vfio->dirty.is_enabled = false;
+}
+
+static void
+pds_vfio_print_guest_region_info(struct pds_vfio_pci_device *pds_vfio,
+ u8 max_regions)
+{
+ int len = max_regions * sizeof(struct pds_lm_dirty_region_info);
+ struct pds_lm_dirty_region_info *region_info;
+ struct pci_dev *pdev = pds_vfio->pdev;
+ dma_addr_t regions_dma;
+ u8 num_regions;
+ int err;
+
+ region_info = kcalloc(max_regions,
+ sizeof(struct pds_lm_dirty_region_info),
+ GFP_KERNEL);
+ if (!region_info)
+ return;
+
+ regions_dma = dma_map_single(pds_vfio->coredev, region_info, len,
+ DMA_FROM_DEVICE);
+ if (dma_mapping_error(pds_vfio->coredev, regions_dma)) {
+ kfree(region_info);
+ return;
+ }
+
+ err = pds_vfio_dirty_status_cmd(pds_vfio, regions_dma,
+ &max_regions, &num_regions);
+ dma_unmap_single(pds_vfio->coredev, regions_dma, len, DMA_FROM_DEVICE);
+
+ if (!err) {
+ int i;
+
+ for (i = 0; i < num_regions; i++)
+ dev_dbg(&pdev->dev, "region_info[%d]: dma_base 0x%llx page_count %u page_size_log2 %u\n",
+ i, le64_to_cpu(region_info[i].dma_base),
+ le32_to_cpu(region_info[i].page_count),
+ region_info[i].page_size_log2);
+ }
+
+ kfree(region_info);
+}
+
+static int
+pds_vfio_dirty_alloc_bitmaps(struct pds_vfio_dirty *dirty,
+ u32 nbits)
+{
+ unsigned long *host_seq_bmp, *host_ack_bmp;
+
+ host_seq_bmp = bitmap_zalloc(nbits, GFP_KERNEL);
+ if (!host_seq_bmp)
+ return -ENOMEM;
+
+ host_ack_bmp = bitmap_zalloc(nbits, GFP_KERNEL);
+ if (!host_ack_bmp) {
+ bitmap_free(host_seq_bmp);
+ return -ENOMEM;
+ }
+
+ dirty->host_seq.bmp = host_seq_bmp;
+ dirty->host_ack.bmp = host_ack_bmp;
+
+ return 0;
+}
+
+static void
+pds_vfio_dirty_free_bitmaps(struct pds_vfio_dirty *dirty)
+{
+ if (dirty->host_seq.bmp)
+ bitmap_free(dirty->host_seq.bmp);
+ if (dirty->host_ack.bmp)
+ bitmap_free(dirty->host_ack.bmp);
+
+ dirty->host_seq.bmp = NULL;
+ dirty->host_ack.bmp = NULL;
+}
+
+static void
+__pds_vfio_dirty_free_sgl(struct pds_vfio_pci_device *pds_vfio,
+ struct pds_vfio_bmp_info *bmp_info)
+{
+ dma_free_coherent(pds_vfio->coredev,
+ bmp_info->num_sge * sizeof(*bmp_info->sgl),
+ bmp_info->sgl, bmp_info->sgl_addr);
+
+ bmp_info->num_sge = 0;
+ bmp_info->sgl = NULL;
+ bmp_info->sgl_addr = 0;
+}
+
+static void
+pds_vfio_dirty_free_sgl(struct pds_vfio_pci_device *pds_vfio)
+{
+ if (pds_vfio->dirty.host_seq.sgl)
+ __pds_vfio_dirty_free_sgl(pds_vfio,
+ &pds_vfio->dirty.host_seq);
+ if (pds_vfio->dirty.host_ack.sgl)
+ __pds_vfio_dirty_free_sgl(pds_vfio,
+ &pds_vfio->dirty.host_ack);
+}
+
+static int
+__pds_vfio_dirty_alloc_sgl(struct pds_vfio_pci_device *pds_vfio,
+ struct pds_vfio_bmp_info *bmp_info,
+ u32 page_count)
+{
+ struct pds_lm_sg_elem *sgl;
+ dma_addr_t sgl_addr;
+ u32 max_sge;
+
+ max_sge = DIV_ROUND_UP(page_count, PAGE_SIZE * 8);
+
+ sgl = dma_alloc_coherent(pds_vfio->coredev,
+ max_sge * sizeof(*sgl), &sgl_addr,
+ GFP_KERNEL);
+ if (!sgl)
+ return -ENOMEM;
+
+ bmp_info->sgl = sgl;
+ bmp_info->num_sge = max_sge;
+ bmp_info->sgl_addr = sgl_addr;
+
+ return 0;
+}
+
+static int
+pds_vfio_dirty_alloc_sgl(struct pds_vfio_pci_device *pds_vfio,
+ u32 page_count)
+{
+ struct pds_vfio_dirty *dirty = &pds_vfio->dirty;
+ int err;
+
+ err = __pds_vfio_dirty_alloc_sgl(pds_vfio,
+ &dirty->host_seq,
+ page_count);
+ if (err)
+ return err;
+
+ err = __pds_vfio_dirty_alloc_sgl(pds_vfio,
+ &dirty->host_ack,
+ page_count);
+ if (err) {
+ __pds_vfio_dirty_free_sgl(pds_vfio, &dirty->host_seq);
+ return err;
+ }
+
+ return 0;
+}
+
+static int
+pds_vfio_dirty_enable(struct pds_vfio_pci_device *pds_vfio,
+ struct rb_root_cached *ranges, u32 nnodes,
+ u64 *page_size)
+{
+ struct pds_vfio_dirty *dirty = &pds_vfio->dirty;
+ u64 region_start, region_size, region_page_size;
+ struct pds_lm_dirty_region_info *region_info;
+ struct interval_tree_node *node = NULL;
+ struct pci_dev *pdev = pds_vfio->pdev;
+ u8 max_regions = 0, num_regions;
+ dma_addr_t regions_dma = 0;
+ u32 num_ranges = nnodes;
+ u32 page_count;
+ u16 len;
+ int err;
+
+ dev_dbg(&pdev->dev, "vf%u: Start dirty page tracking\n", pds_vfio->vf_id);
+
+ if (pds_vfio_dirty_is_enabled(pds_vfio))
+ return -EINVAL;
+
+ pds_vfio_dirty_set_enabled(pds_vfio);
+
+ /* find if dirty tracking is disabled, i.e. num_regions == 0 */
+ err = pds_vfio_dirty_status_cmd(pds_vfio, 0, &max_regions, &num_regions);
+ if (num_regions) {
+ dev_err(&pdev->dev, "Dirty tracking already enabled for %d regions\n",
+ num_regions);
+ err = -EEXIST;
+ goto err_out;
+ } else if (!max_regions) {
+ dev_err(&pdev->dev, "Device doesn't support dirty tracking, max_regions %d\n",
+ max_regions);
+ err = -EOPNOTSUPP;
+ goto err_out;
+ } else if (err) {
+ dev_err(&pdev->dev, "Failed to get dirty status, err %pe\n",
+ ERR_PTR(err));
+ goto err_out;
+ }
+
+ /* Only support 1 region for now. If there are any large gaps in the
+ * VM's address regions, then this would be a waste of memory as we are
+ * generating 2 bitmaps (ack/seq) from the min address to the max
+ * address of the VM's address regions. In the future, if we support
+ * more than one region in the device/driver we can split the bitmaps
+ * on the largest address region gaps. We can do this split up to the
+ * max_regions times returned from the dirty_status command.
+ */
+ max_regions = 1;
+ if (num_ranges > max_regions) {
+ vfio_combine_iova_ranges(ranges, nnodes, max_regions);
+ num_ranges = max_regions;
+ }
+
+ node = interval_tree_iter_first(ranges, 0, ULONG_MAX);
+ if (!node) {
+ err = -EINVAL;
+ goto err_out;
+ }
+
+ region_size = node->last - node->start + 1;
+ region_start = node->start;
+ region_page_size = *page_size;
+
+ len = sizeof(*region_info);
+ region_info = kzalloc(len, GFP_KERNEL);
+ if (!region_info) {
+ err = -ENOMEM;
+ goto err_out;
+ }
+
+ page_count = DIV_ROUND_UP(region_size, region_page_size);
+
+ region_info->dma_base = cpu_to_le64(region_start);
+ region_info->page_count = cpu_to_le32(page_count);
+ region_info->page_size_log2 = ilog2(region_page_size);
+
+ regions_dma = dma_map_single(pds_vfio->coredev, (void *)region_info, len,
+ DMA_BIDIRECTIONAL);
+ if (dma_mapping_error(pds_vfio->coredev, regions_dma)) {
+ err = -ENOMEM;
+ kfree(region_info);
+ goto err_out;
+ }
+
+ err = pds_vfio_dirty_enable_cmd(pds_vfio, regions_dma, max_regions);
+ dma_unmap_single(pds_vfio->coredev, regions_dma, len, DMA_BIDIRECTIONAL);
+ /* page_count might be adjusted by the device,
+ * update it before freeing region_info DMA
+ */
+ page_count = le32_to_cpu(region_info->page_count);
+
+ dev_dbg(&pdev->dev, "region_info: regions_dma 0x%llx dma_base 0x%llx page_count %u page_size_log2 %u\n",
+ regions_dma, region_start, page_count, (u8)ilog2(region_page_size));
+
+ kfree(region_info);
+ if (err)
+ goto err_out;
+
+ err = pds_vfio_dirty_alloc_bitmaps(dirty, page_count);
+ if (err) {
+ dev_err(&pdev->dev, "Failed to alloc dirty bitmaps: %pe\n",
+ ERR_PTR(err));
+ goto err_out;
+ }
+
+ err = pds_vfio_dirty_alloc_sgl(pds_vfio, page_count);
+ if (err) {
+ dev_err(&pdev->dev, "Failed to alloc dirty sg lists: %pe\n",
+ ERR_PTR(err));
+ goto err_free_bitmaps;
+ }
+
+ dirty->region_start = region_start;
+ dirty->region_size = region_size;
+ dirty->region_page_size = region_page_size;
+
+ pds_vfio_print_guest_region_info(pds_vfio, max_regions);
+
+ return 0;
+
+err_free_bitmaps:
+ pds_vfio_dirty_free_bitmaps(dirty);
+err_out:
+ pds_vfio_dirty_set_disabled(pds_vfio);
+ return err;
+}
+
+static int
+pds_vfio_dirty_disable(struct pds_vfio_pci_device *pds_vfio)
+{
+ int err;
+
+ if (!pds_vfio_dirty_is_enabled(pds_vfio))
+ return 0;
+
+ pds_vfio_dirty_set_disabled(pds_vfio);
+ err = pds_vfio_dirty_disable_cmd(pds_vfio);
+ pds_vfio_dirty_free_sgl(pds_vfio);
+ pds_vfio_dirty_free_bitmaps(&pds_vfio->dirty);
+
+ return err;
+}
+
+static int
+pds_vfio_dirty_seq_ack(struct pds_vfio_pci_device *pds_vfio,
+ struct pds_vfio_bmp_info *bmp_info,
+ u32 offset, u32 bmp_bytes,
+ bool read_seq)
+{
+ const char *bmp_type_str = read_seq ? "read_seq" : "write_ack";
+ struct pci_dev *pdev = pds_vfio->pdev;
+ int bytes_remaining;
+ dma_addr_t bmp_dma;
+ u8 dma_direction;
+ u16 num_sge = 0;
+ int err, i;
+ u64 *bmp;
+
+ bmp = (u64 *)((u64)bmp_info->bmp + offset);
+
+ dma_direction = read_seq ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
+ bmp_dma = dma_map_single(pds_vfio->coredev, bmp, bmp_bytes,
+ dma_direction);
+ if (dma_mapping_error(pds_vfio->coredev, bmp_dma))
+ return -EINVAL;
+
+ bytes_remaining = bmp_bytes;
+
+ for (i = 0; i < bmp_info->num_sge && bytes_remaining > 0; i++) {
+ struct pds_lm_sg_elem *sg_elem = &bmp_info->sgl[i];
+ u32 len = (bytes_remaining > PAGE_SIZE) ?
+ PAGE_SIZE : bytes_remaining;
+
+ sg_elem->addr = cpu_to_le64(bmp_dma + i * PAGE_SIZE);
+ sg_elem->len = cpu_to_le32(len);
+
+ bytes_remaining -= len;
+ ++num_sge;
+ }
+
+ err = pds_vfio_dirty_seq_ack_cmd(pds_vfio, bmp_info->sgl_addr,
+ num_sge, offset, bmp_bytes, read_seq);
+ if (err)
+ dev_err(&pdev->dev, "Dirty bitmap %s failed offset %u bmp_bytes %u num_sge %u DMA 0x%llx: %pe\n",
+ bmp_type_str, offset, bmp_bytes, num_sge, bmp_info->sgl_addr, ERR_PTR(err));
+
+ dma_unmap_single(pds_vfio->coredev, bmp_dma, bmp_bytes, dma_direction);
+
+ return err;
+}
+
+static int
+pds_vfio_dirty_write_ack(struct pds_vfio_pci_device *pds_vfio, u32 offset,
+ u32 len)
+{
+ return pds_vfio_dirty_seq_ack(pds_vfio,
+ &pds_vfio->dirty.host_ack, offset,
+ len, WRITE_ACK);
+}
+
+static int
+pds_vfio_dirty_read_seq(struct pds_vfio_pci_device *pds_vfio, u32 offset,
+ u32 len)
+{
+ return pds_vfio_dirty_seq_ack(pds_vfio,
+ &pds_vfio->dirty.host_seq, offset,
+ len, READ_SEQ);
+}
+
+static int
+pds_vfio_dirty_process_bitmaps(struct pds_vfio_pci_device *pds_vfio,
+ struct iova_bitmap *dirty_bitmap, u32 bmp_offset,
+ u32 len_bytes)
+{
+ u64 page_size = pds_vfio->dirty.region_page_size;
+ u64 region_start = pds_vfio->dirty.region_start;
+ u32 bmp_offset_bit;
+ int dword_count, i;
+ __le64 *seq, *ack;
+
+ dword_count = len_bytes / sizeof(u64);
+ seq = (__le64 *)((u64)pds_vfio->dirty.host_seq.bmp + bmp_offset);
+ ack = (__le64 *)((u64)pds_vfio->dirty.host_ack.bmp + bmp_offset);
+ bmp_offset_bit = bmp_offset * 8;
+
+ for (i = 0; i < dword_count; i++) {
+ u64 xor = le64_to_cpu(seq[i]) ^ le64_to_cpu(ack[i]);
+ u8 bit_i;
+
+ /* prepare for next write_ack call */
+ ack[i] = seq[i];
+
+ for (bit_i = 0; bit_i < BITS_PER_TYPE(u64); ++bit_i) {
+ if (xor & BIT(bit_i)) {
+ u64 abs_bit_i = bmp_offset_bit + i *
+ BITS_PER_TYPE(u64) + bit_i;
+ u64 addr = abs_bit_i * page_size + region_start;
+
+ iova_bitmap_set(dirty_bitmap, addr, page_size);
+ }
+ }
+ }
+
+ return 0;
+}
+
+static int
+pds_vfio_dirty_sync(struct pds_vfio_pci_device *pds_vfio,
+ struct iova_bitmap *dirty_bitmap,
+ unsigned long iova, unsigned long length)
+{
+ struct pds_vfio_dirty *dirty = &pds_vfio->dirty;
+ struct pci_dev *pdev = pds_vfio->pdev;
+ u64 bmp_offset, bmp_bytes;
+ u64 bitmap_size, pages;
+ int err;
+
+ dev_dbg(&pdev->dev, "vf%u: Get dirty page bitmap\n", pds_vfio->vf_id);
+
+ if (!pds_vfio_dirty_is_enabled(pds_vfio)) {
+ dev_err(&pdev->dev, "vf%u: Sync failed, dirty tracking is disabled\n",
+ pds_vfio->vf_id);
+ return -EINVAL;
+ }
+
+ pages = DIV_ROUND_UP(length, pds_vfio->dirty.region_page_size);
+ bitmap_size = round_up(pages, sizeof(u64) * BITS_PER_BYTE) /
+ BITS_PER_BYTE;
+
+ dev_dbg(&pdev->dev, "vf%u: iova 0x%lx length %lu page_size %llu pages %llu bitmap_size %llu\n",
+ pds_vfio->vf_id, iova, length,
+ pds_vfio->dirty.region_page_size, pages, bitmap_size);
+
+ if (!length ||
+ ((dirty->region_start + iova + length) >
+ (dirty->region_start + dirty->region_size))) {
+ dev_err(&pdev->dev, "Invalid iova 0x%lx and/or length 0x%lx to sync\n",
+ iova, length);
+ return -EINVAL;
+ }
+
+ /* bitmap is modified in 64 bit chunks */
+ bmp_bytes = ALIGN(DIV_ROUND_UP(length / dirty->region_page_size,
+ sizeof(u64)), sizeof(u64));
+ if (bmp_bytes != bitmap_size) {
+ dev_err(&pdev->dev, "Calculated bitmap bytes %llu not equal to bitmap size %llu\n",
+ bmp_bytes, bitmap_size);
+ return -EINVAL;
+ }
+
+ bmp_offset = DIV_ROUND_UP(iova / dirty->region_page_size, sizeof(u64));
+
+ dev_dbg(&pdev->dev, "Syncing dirty bitmap, iova 0x%lx length 0x%lx, bmp_offset %llu bmp_bytes %llu\n",
+ iova, length, bmp_offset, bmp_bytes);
+
+ err = pds_vfio_dirty_read_seq(pds_vfio, bmp_offset, bmp_bytes);
+ if (err)
+ return err;
+
+ err = pds_vfio_dirty_process_bitmaps(pds_vfio, dirty_bitmap,
+ bmp_offset, bmp_bytes);
+ if (err)
+ return err;
+
+ err = pds_vfio_dirty_write_ack(pds_vfio, bmp_offset, bmp_bytes);
+ if (err)
+ return err;
+
+ return 0;
+}
+
+int
+pds_vfio_dma_logging_report(struct vfio_device *vdev, unsigned long iova,
+ unsigned long length,
+ struct iova_bitmap *dirty)
+{
+ struct pds_vfio_pci_device *pds_vfio =
+ container_of(vdev, struct pds_vfio_pci_device,
+ vfio_coredev.vdev);
+
+ return pds_vfio_dirty_sync(pds_vfio, dirty, iova, length);
+}
+
+int
+pds_vfio_dma_logging_start(struct vfio_device *vdev,
+ struct rb_root_cached *ranges, u32 nnodes,
+ u64 *page_size)
+{
+ struct pds_vfio_pci_device *pds_vfio =
+ container_of(vdev, struct pds_vfio_pci_device,
+ vfio_coredev.vdev);
+ int err;
+
+ pds_vfio_send_host_vf_lm_status_cmd(pds_vfio, PDS_LM_STA_IN_PROGRESS);
+
+ err = pds_vfio_dirty_enable(pds_vfio, ranges, nnodes, page_size);
+ if (err)
+ return err;
+
+ return 0;
+}
+
+int
+pds_vfio_dma_logging_stop(struct vfio_device *vdev)
+{
+ struct pds_vfio_pci_device *pds_vfio =
+ container_of(vdev, struct pds_vfio_pci_device,
+ vfio_coredev.vdev);
+
+ return pds_vfio_dirty_disable(pds_vfio);
+}
new file mode 100644
@@ -0,0 +1,48 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright(c) 2023 Advanced Micro Devices, Inc. */
+
+#ifndef _DIRTY_H_
+#define _DIRTY_H_
+
+#include <linux/types.h>
+#include <linux/iova_bitmap.h>
+
+#include <linux/pds/pds_lm.h>
+
+struct pds_vfio_bmp_info {
+ unsigned long *bmp;
+ u32 bmp_bytes;
+ struct pds_lm_sg_elem *sgl;
+ dma_addr_t sgl_addr;
+ u16 num_sge;
+};
+
+struct pds_vfio_dirty {
+ struct pds_vfio_bmp_info host_seq;
+ struct pds_vfio_bmp_info host_ack;
+ u64 region_size;
+ u64 region_start;
+ u64 region_page_size;
+ bool is_enabled;
+};
+
+struct pds_vfio_pci_device;
+
+bool
+pds_vfio_dirty_is_enabled(struct pds_vfio_pci_device *pds_vfio);
+void
+pds_vfio_dirty_set_enabled(struct pds_vfio_pci_device *pds_vfio);
+void
+pds_vfio_dirty_set_disabled(struct pds_vfio_pci_device *pds_vfio);
+
+int
+pds_vfio_dma_logging_report(struct vfio_device *vdev, unsigned long iova,
+ unsigned long length,
+ struct iova_bitmap *dirty);
+int
+pds_vfio_dma_logging_start(struct vfio_device *vdev,
+ struct rb_root_cached *ranges, u32 nnodes,
+ u64 *page_size);
+int
+pds_vfio_dma_logging_stop(struct vfio_device *vdev);
+#endif /* _DIRTY_H_ */
@@ -33,6 +33,16 @@ struct pds_vfio_pci_device;
struct file *
pds_vfio_step_device_state_locked(struct pds_vfio_pci_device *pds_vfio,
enum vfio_device_mig_state next);
+int
+pds_vfio_dma_logging_report(struct vfio_device *vdev, unsigned long iova,
+ unsigned long length,
+ struct iova_bitmap *dirty);
+int
+pds_vfio_dma_logging_start(struct vfio_device *vdev,
+ struct rb_root_cached *ranges, u32 nnodes,
+ u64 *page_size);
+int
+pds_vfio_dma_logging_stop(struct vfio_device *vdev);
const char *
pds_vfio_lm_state(enum vfio_device_mig_state state);
void
@@ -5,6 +5,7 @@
#include <linux/vfio_pci_core.h>
#include "lm.h"
+#include "dirty.h"
#include "vfio_dev.h"
#include "aux_drv.h"
@@ -117,6 +118,13 @@ pds_vfio_lm_ops = {
.migration_get_data_size = pds_vfio_get_device_state_size
};
+static const struct vfio_log_ops
+pds_vfio_log_ops = {
+ .log_start = pds_vfio_dma_logging_start,
+ .log_stop = pds_vfio_dma_logging_stop,
+ .log_read_and_clear = pds_vfio_dma_logging_report,
+};
+
static int
pds_vfio_init_device(struct vfio_device *vdev)
{
@@ -135,6 +143,7 @@ pds_vfio_init_device(struct vfio_device *vdev)
vdev->migration_flags = VFIO_MIGRATION_STOP_COPY | VFIO_MIGRATION_P2P;
vdev->mig_ops = &pds_vfio_lm_ops;
+ vdev->log_ops = &pds_vfio_log_ops;
dev_dbg(&pdev->dev, "%s: PF %#04x VF %#04x (%d) vf_id %d domain %d pds_vfio %p\n",
__func__, pci_dev_id(pdev->physfn),
@@ -7,6 +7,7 @@
#include <linux/pci.h>
#include <linux/vfio_pci_core.h>
+#include "dirty.h"
#include "lm.h"
struct pds_vfio_pci_device {
@@ -17,6 +18,7 @@ struct pds_vfio_pci_device {
struct pds_vfio_lm_file *save_file;
struct pds_vfio_lm_file *restore_file;
+ struct pds_vfio_dirty dirty;
struct mutex state_mutex; /* protect migration state */
enum vfio_device_mig_state state;
spinlock_t reset_lock; /* protect reset_done flow */
@@ -25,6 +25,13 @@ enum pds_lm_cmd_opcode {
PDS_LM_CMD_RESUME = 20,
PDS_LM_CMD_SAVE = 21,
PDS_LM_CMD_RESTORE = 22,
+
+ /* Dirty page tracking commands */
+ PDS_LM_CMD_DIRTY_STATUS = 32,
+ PDS_LM_CMD_DIRTY_ENABLE = 33,
+ PDS_LM_CMD_DIRTY_DISABLE = 34,
+ PDS_LM_CMD_DIRTY_READ_SEQ = 35,
+ PDS_LM_CMD_DIRTY_WRITE_ACK = 36,
};
/**
@@ -215,4 +222,170 @@ struct pds_lm_host_vf_status_cmd {
u8 status;
};
+/**
+ * struct pds_lm_dirty_region_info - Memory region info for STATUS and ENABLE
+ * @dma_base: Base address of the DMA-contiguous memory region
+ * @page_count: Number of pages in the memory region
+ * @page_size_log2: Log2 page size in the memory region
+ * @rsvd: Word boundary padding
+ */
+struct pds_lm_dirty_region_info {
+ __le64 dma_base;
+ __le32 page_count;
+ u8 page_size_log2;
+ u8 rsvd[3];
+};
+
+/**
+ * struct pds_lm_dirty_status_cmd - DIRTY_STATUS command
+ * @opcode: Opcode PDS_LM_CMD_DIRTY_STATUS
+ * @rsvd: Word boundary padding
+ * @vf_id: VF id
+ * @max_regions: Capacity of the region info buffer
+ * @rsvd2: Word boundary padding
+ * @regions_dma: DMA address of the region info buffer
+ *
+ * The minimum of max_regions (from the command) and num_regions (from the
+ * completion) of struct pds_lm_dirty_region_info will be written to
+ * regions_dma.
+ *
+ * The max_regions may be zero, in which case regions_dma is ignored. In that
+ * case, the completion will only report the maximum number of regions
+ * supported by the device, and the number of regions currently enabled.
+ */
+struct pds_lm_dirty_status_cmd {
+ u8 opcode;
+ u8 rsvd;
+ __le16 vf_id;
+ u8 max_regions;
+ u8 rsvd2[3];
+ __le64 regions_dma;
+} __packed;
+
+/**
+ * enum pds_lm_dirty_bmp_type - Type of dirty page bitmap
+ * @PDS_LM_DIRTY_BMP_TYPE_NONE: No bitmap / disabled
+ * @PDS_LM_DIRTY_BMP_TYPE_SEQ_ACK: Seq/Ack bitmap representation
+ */
+enum pds_lm_dirty_bmp_type {
+ PDS_LM_DIRTY_BMP_TYPE_NONE = 0,
+ PDS_LM_DIRTY_BMP_TYPE_SEQ_ACK = 1,
+};
+
+/**
+ * struct pds_lm_dirty_status_comp - STATUS command completion
+ * @status: Status of the command (enum pds_core_status_code)
+ * @rsvd: Word boundary padding
+ * @comp_index: Index in the desc ring for which this is the completion
+ * @max_regions: Maximum number of regions supported by the device
+ * @num_regions: Number of regions currently enabled
+ * @bmp_type: Type of dirty bitmap representation
+ * @rsvd2: Word boundary padding
+ * @bmp_type_mask: Mask of supported bitmap types, bit index per type
+ * @rsvd3: Word boundary padding
+ * @color: Color bit
+ *
+ * This completion descriptor is used for STATUS, ENABLE, and DISABLE.
+ */
+struct pds_lm_dirty_status_comp {
+ u8 status;
+ u8 rsvd;
+ __le16 comp_index;
+ u8 max_regions;
+ u8 num_regions;
+ u8 bmp_type;
+ u8 rsvd2;
+ __le32 bmp_type_mask;
+ u8 rsvd3[3];
+ u8 color;
+};
+
+/**
+ * struct pds_lm_dirty_enable_cmd - DIRTY_ENABLE command
+ * @opcode: Opcode PDS_LM_CMD_DIRTY_ENABLE
+ * @rsvd: Word boundary padding
+ * @vf_id: VF id
+ * @bmp_type: Type of dirty bitmap representation
+ * @num_regions: Number of entries in the region info buffer
+ * @rsvd2: Word boundary padding
+ * @regions_dma: DMA address of the region info buffer
+ *
+ * The num_regions must be nonzero, and less than or equal to the maximum
+ * number of regions supported by the device.
+ *
+ * The memory regions should not overlap.
+ *
+ * The information should be initialized by the driver. The device may modify
+ * the information on successful completion, such as by size-aligning the
+ * number of pages in a region.
+ *
+ * The modified number of pages will be greater than or equal to the page count
+ * given in the enable command, and at least as coarsly aligned as the given
+ * value. For example, the count might be aligned to a multiple of 64, but
+ * if the value is already a multiple of 128 or higher, it will not change.
+ * If the driver requires its own minimum alignment of the number of pages, the
+ * driver should account for that already in the region info of this command.
+ *
+ * This command uses struct pds_lm_dirty_status_comp for its completion.
+ */
+struct pds_lm_dirty_enable_cmd {
+ u8 opcode;
+ u8 rsvd;
+ __le16 vf_id;
+ u8 bmp_type;
+ u8 num_regions;
+ u8 rsvd2[2];
+ __le64 regions_dma;
+} __packed;
+
+/**
+ * struct pds_lm_dirty_disable_cmd - DIRTY_DISABLE command
+ * @opcode: Opcode PDS_LM_CMD_DIRTY_DISABLE
+ * @rsvd: Word boundary padding
+ * @vf_id: VF id
+ *
+ * Dirty page tracking will be disabled. This may be called in any state, as
+ * long as dirty page tracking is supported by the device, to ensure that dirty
+ * page tracking is disabled.
+ *
+ * This command uses struct pds_lm_dirty_status_comp for its completion. On
+ * success, num_regions will be zero.
+ */
+struct pds_lm_dirty_disable_cmd {
+ u8 opcode;
+ u8 rsvd;
+ __le16 vf_id;
+};
+
+/**
+ * struct pds_lm_dirty_seq_ack_cmd - DIRTY_READ_SEQ or _WRITE_ACK command
+ * @opcode: Opcode PDS_LM_CMD_DIRTY_[READ_SEQ|WRITE_ACK]
+ * @rsvd: Word boundary padding
+ * @vf_id: VF id
+ * @off_bytes: Byte offset in the bitmap
+ * @len_bytes: Number of bytes to transfer
+ * @num_sge: Number of DMA scatter gather elements
+ * @rsvd2: Word boundary padding
+ * @sgl_addr: DMA address of scatter gather list
+ *
+ * Read bytes from the SEQ bitmap, or write bytes into the ACK bitmap.
+ *
+ * This command treats the entire bitmap as a byte buffer. It does not
+ * distinguish between guest memory regions. The driver should refer to the
+ * number of pages in each region, according to PDS_LM_CMD_DIRTY_STATUS, to
+ * determine the region boundaries in the bitmap. Each region will be
+ * represented by exactly the number of bits as the page count for that region,
+ * immediately following the last bit of the previous region.
+ */
+struct pds_lm_dirty_seq_ack_cmd {
+ u8 opcode;
+ u8 rsvd;
+ __le16 vf_id;
+ __le32 off_bytes;
+ __le32 len_bytes;
+ __le16 num_sge;
+ u8 rsvd2[2];
+ __le64 sgl_addr;
+} __packed;
+
#endif /* _PDS_LM_H_ */