Re: [RFC PATCH v4 36/38] PCI: endpoint: pci-epf-test: Add remote eDMA-backed mode

Koichiro Den
2026-01-22T14:54:34Z

On Mon, Jan 19, 2026 at 03:47:27PM -0500, Frank Li wrote:
> On Sun, Jan 18, 2026 at 10:54:38PM +0900, Koichiro Den wrote:
> > Some DesignWare-based endpoints integrate an eDMA engine that can be
> > programmed by the host via MMIO. The upcoming NTB transport remote-eDMA
> > backend relies on this capability, but there is currently no upstream
> > test coverage for the end-to-end control and data path.
> >
> > Extend pci-epf-test with an optional remote eDMA test backend (built when
> > CONFIG_DW_EDMA is enabled).
> >
> > - Reserve a spare BAR and expose a small 'pcitest_edma_info' header at
> > BAR offset 0. The header carries a magic/version and describes the
> > endpoint eDMA register window, per-direction linked-list (LL)
> > locations and an endpoint test buffer.
> > - Map the eDMA registers and LL locations into that BAR using BAR
> > subrange mappings (address-match inbound iATU).
> >
> > To run this extra testing, two new endpoint commands are added:
> > * COMMAND_REMOTE_EDMA_SETUP
> > * COMMAND_REMOTE_EDMA_CHECKSUM
> >
> > When the former command is received, the endpoint prepares for the
> > remote eDMA transfer. The CHECKSUM command is useful for Host-to-EP
> > transfer testing, as the endpoint side is not expected to receive the
> > DMA completion interrupt directly. Instead, the host asks the endpoint
> > to compute a CRC32 over the transferred data.
> >
> > This backend is exercised by the host-side pci_endpoint_test driver via a
> > new UAPI flag.
> >
> > Signed-off-by: Koichiro Den <den@valinux.co.jp>
> > ---
> > drivers/pci/endpoint/functions/pci-epf-test.c | 477 ++++++++++++++++++
>
> This patch should be combined into your submap patches, which is one user
> of submap.

Thanks for the comment, and my apologies for the delayed response to this.

The pci endpoint test case addition depends on both of the following prerequisites:

1) [PATCH v9 0/5] PCI: endpoint: BAR subrange mapping support
https://lore.kernel.org/all/20260122084909.2390865-1-den@valinux.co.jp/

2) A not-yet-submitted series for Patch 01-05, as described in the "Patch
layout" section of the cover letter:
https://lore.kernel.org/all/20260118135440.1958279-1-den@valinux.co.jp/

[...]
1. dw-edma / DesignWare EP helpers needed for remote embedded-DMA (export
register/LL windows, IRQ routing control, etc.)

Patch 01 : dmaengine: dw-edma: Export helper to get integrated register window
Patch 02 : dmaengine: dw-edma: Add per-channel interrupt routing control
Patch 03 : dmaengine: dw-edma: Poll completion when local IRQ handling is disabled
Patch 04 : dmaengine: dw-edma: Add notify-only channels support
Patch 05 : dmaengine: dw-edma: Add a helper to query linked-list region
[...]

I plan to submit these patches shortly, perhaps as a single series, once the
design discussion in the following thread is resolved:
https://lore.kernel.org/all/2bcksnyuxj33bjctjombrstfvjrcdtap6i3v6xhfxtqjmbdkwm@jcaoy2iuh5pr/
Thank you for reviewing that discussion as well.

Given that (1) precedes (2), it should be reasonable to include the PCI
endpoint test case additions (Patchs 35-38) as part of the series in (2).

Kind regards,
Koichiro

>
> Frank
>
> > 1 file changed, 477 insertions(+)
> >
> > diff --git a/drivers/pci/endpoint/functions/pci-epf-test.c b/drivers/pci/endpoint/functions/pci-epf-test.c
> > index e560c3becebb..eea10bddcd2a 100644
> > --- a/drivers/pci/endpoint/functions/pci-epf-test.c
> > +++ b/drivers/pci/endpoint/functions/pci-epf-test.c
> > @@ -10,6 +10,7 @@
> > #include <linux/delay.h>
> > #include <linux/dmaengine.h>
> > #include <linux/io.h>
> > +#include <linux/iommu.h>
> > #include <linux/module.h>
> > #include <linux/msi.h>
> > #include <linux/slab.h>
> > @@ -33,6 +34,8 @@
> > #define COMMAND_COPY BIT(5)
> > #define COMMAND_ENABLE_DOORBELL BIT(6)
> > #define COMMAND_DISABLE_DOORBELL BIT(7)
> > +#define COMMAND_REMOTE_EDMA_SETUP BIT(8)
> > +#define COMMAND_REMOTE_EDMA_CHECKSUM BIT(9)
> >
> > #define STATUS_READ_SUCCESS BIT(0)
> > #define STATUS_READ_FAIL BIT(1)
> > @@ -48,6 +51,10 @@
> > #define STATUS_DOORBELL_ENABLE_FAIL BIT(11)
> > #define STATUS_DOORBELL_DISABLE_SUCCESS BIT(12)
> > #define STATUS_DOORBELL_DISABLE_FAIL BIT(13)
> > +#define STATUS_REMOTE_EDMA_SETUP_SUCCESS BIT(14)
> > +#define STATUS_REMOTE_EDMA_SETUP_FAIL BIT(15)
> > +#define STATUS_REMOTE_EDMA_CHECKSUM_SUCCESS BIT(16)
> > +#define STATUS_REMOTE_EDMA_CHECKSUM_FAIL BIT(17)
> >
> > #define FLAG_USE_DMA BIT(0)
> >
> > @@ -77,6 +84,9 @@ struct pci_epf_test {
> > bool dma_private;
> > const struct pci_epc_features *epc_features;
> > struct pci_epf_bar db_bar;
> > +
> > + /* For extended tests that rely on vendor-specific features */
> > + void *data;
> > };
> >
> > struct pci_epf_test_reg {
> > @@ -117,6 +127,454 @@ static enum pci_barno pci_epf_test_next_free_bar(struct pci_epf_test *epf_test)
> > return bar;
> > }
> >
> > +#if IS_REACHABLE(CONFIG_DW_EDMA)
> > +#include <linux/dma/edma.h>
> > +
> > +#define PCITEST_EDMA_INFO_MAGIC 0x414d4445U /* 'EDMA' */
> > +#define PCITEST_EDMA_INFO_VERSION 0x00010000U
> > +#define PCITEST_EDMA_TEST_BUF_SIZE (1024 * 1024)
> > +
> > +struct pci_epf_test_edma {
> > + /* Remote eDMA test resources */
> > + bool enabled;
> > + enum pci_barno bar;
> > + void *info;
> > + size_t total_size;
> > + void *test_buf;
> > + dma_addr_t test_buf_phys;
> > + size_t test_buf_size;
> > +
> > + /* DW eDMA specifics */
> > + phys_addr_t reg_phys;
> > + size_t reg_submap_sz;
> > + unsigned long reg_iova;
> > + size_t reg_iova_sz;
> > + phys_addr_t ll_rd_phys;
> > + size_t ll_rd_sz_aligned;
> > + phys_addr_t ll_wr_phys;
> > + size_t ll_wr_sz_aligned;
> > +};
> > +
> > +struct pcitest_edma_info {
> > + __le32 magic;
> > + __le32 version;
> > +
> > + __le32 reg_off;
> > + __le32 reg_size;
> > +
> > + __le64 ll_rd_phys;
> > + __le32 ll_rd_off;
> > + __le32 ll_rd_size;
> > +
> > + __le64 ll_wr_phys;
> > + __le32 ll_wr_off;
> > + __le32 ll_wr_size;
> > +
> > + __le64 test_buf_phys;
> > + __le32 test_buf_size;
> > +};
> > +
> > +static bool pci_epf_test_bar_is_reserved(struct pci_epf_test *test,
> > + enum pci_barno barno)
> > +{
> > + struct pci_epf_test_edma *edma = test->data;
> > +
> > + if (!edma)
> > + return false;
> > +
> > + return barno == edma->bar;
> > +}
> > +
> > +static void pci_epf_test_clear_submaps(struct pci_epf_bar *bar)
> > +{
> > + kfree(bar->submap);
> > + bar->submap = NULL;
> > + bar->num_submap = 0;
> > +}
> > +
> > +static int pci_epf_test_add_submap(struct pci_epf_bar *bar, phys_addr_t phys,
> > + size_t size)
> > +{
> > + struct pci_epf_bar_submap *submap, *new;
> > +
> > + new = krealloc_array(bar->submap, bar->num_submap + 1, sizeof(*new),
> > + GFP_KERNEL);
> > + if (!new)
> > + return -ENOMEM;
> > +
> > + bar->submap = new;
> > + submap = &bar->submap[bar->num_submap];
> > + submap->phys_addr = phys;
> > + submap->size = size;
> > + bar->num_submap++;
> > +
> > + return 0;
> > +}
> > +
> > +static void pci_epf_test_clean_remote_edma(struct pci_epf_test *test)
> > +{
> > + struct pci_epf_test_edma *edma = test->data;
> > + struct pci_epf *epf = test->epf;
> > + struct pci_epc *epc = epf->epc;
> > + struct device *dev = epc->dev.parent;
> > + struct iommu_domain *dom;
> > + struct pci_epf_bar *bar;
> > + enum pci_barno barno;
> > +
> > + if (!edma)
> > + return;
> > +
> > + barno = edma->bar;
> > + if (barno == NO_BAR)
> > + return;
> > +
> > + bar = &epf->bar[barno];
> > +
> > + dom = iommu_get_domain_for_dev(dev);
> > + if (dom && edma->reg_iova_sz) {
> > + iommu_unmap(dom, edma->reg_iova, edma->reg_iova_sz);
> > + edma->reg_iova = 0;
> > + edma->reg_iova_sz = 0;
> > + }
> > +
> > + if (edma->test_buf) {
> > + dma_free_coherent(dev, edma->test_buf_size,
> > + edma->test_buf,
> > + edma->test_buf_phys);
> > + edma->test_buf = NULL;
> > + edma->test_buf_phys = 0;
> > + edma->test_buf_size = 0;
> > + }
> > +
> > + if (edma->info) {
> > + pci_epf_free_space(epf, edma->info, barno, PRIMARY_INTERFACE);
> > + edma->info = NULL;
> > + }
> > +
> > + pci_epf_test_clear_submaps(bar);
> > + pci_epc_clear_bar(epc, epf->func_no, epf->vfunc_no, bar);
> > +
> > + edma->bar = NO_BAR;
> > + edma->enabled = false;
> > +}
> > +
> > +static int pci_epf_test_init_remote_edma(struct pci_epf_test *test)
> > +{
> > + const struct pci_epc_features *epc_features = test->epc_features;
> > + struct pci_epf_test_edma *edma;
> > + struct pci_epf *epf = test->epf;
> > + struct pci_epc *epc = epf->epc;
> > + struct pcitest_edma_info *info;
> > + struct device *dev = epc->dev.parent;
> > + struct dw_edma_region region;
> > + struct iommu_domain *dom;
> > + size_t reg_sz_aligned, ll_rd_sz_aligned, ll_wr_sz_aligned;
> > + phys_addr_t phys, ll_rd_phys, ll_wr_phys;
> > + size_t ll_rd_size, ll_wr_size;
> > + resource_size_t reg_size;
> > + unsigned long iova;
> > + size_t off, size;
> > + int ret;
> > +
> > + if (!test->dma_chan_tx || !test->dma_chan_rx)
> > + return -ENODEV;
> > +
> > + edma = devm_kzalloc(&epf->dev, sizeof(*edma), GFP_KERNEL);
> > + if (!edma)
> > + return -ENOMEM;
> > + test->data = edma;
> > +
> > + edma->bar = pci_epf_test_next_free_bar(test);
> > + if (edma->bar == NO_BAR) {
> > + dev_err(&epf->dev, "No spare BAR for remote eDMA (remote eDMA disabled)\n");
> > + ret = -ENOSPC;
> > + goto err;
> > + }
> > +
> > + ret = dw_edma_get_reg_window(epc, &edma->reg_phys, &reg_size);
> > + if (ret) {
> > + dev_err(dev, "failed to get edma reg window: %d\n", ret);
> > + goto err;
> > + }
> > + dom = iommu_get_domain_for_dev(dev);
> > + if (dom) {
> > + phys = edma->reg_phys & PAGE_MASK;
> > + size = PAGE_ALIGN(reg_size + edma->reg_phys - phys);
> > + iova = phys;
> > +
> > + ret = iommu_map(dom, iova, phys, size,
> > + IOMMU_READ | IOMMU_WRITE | IOMMU_MMIO,
> > + GFP_KERNEL);
> > + if (ret) {
> > + dev_err(dev, "failed to direct map eDMA reg: %d\n", ret);
> > + goto err;
> > + }
> > + edma->reg_iova = iova;
> > + edma->reg_iova_sz = size;
> > + }
> > +
> > + /* Get LL location addresses and sizes */
> > + ret = dw_edma_chan_get_ll_region(test->dma_chan_rx, &region);
> > + if (ret) {
> > + dev_err(dev, "failed to get edma ll region for rx: %d\n", ret);
> > + goto err;
> > + }
> > + ll_rd_phys = region.paddr;
> > + ll_rd_size = region.sz;
> > +
> > + ret = dw_edma_chan_get_ll_region(test->dma_chan_tx, &region);
> > + if (ret) {
> > + dev_err(dev, "failed to get edma ll region for tx: %d\n", ret);
> > + goto err;
> > + }
> > + ll_wr_phys = region.paddr;
> > + ll_wr_size = region.sz;
> > +
> > + edma->test_buf_size = PCITEST_EDMA_TEST_BUF_SIZE;
> > + edma->test_buf = dma_alloc_coherent(dev, edma->test_buf_size,
> > + &edma->test_buf_phys, GFP_KERNEL);
> > + if (!edma->test_buf) {
> > + ret = -ENOMEM;
> > + goto err;
> > + }
> > +
> > + reg_sz_aligned = PAGE_ALIGN(reg_size);
> > + ll_rd_sz_aligned = PAGE_ALIGN(ll_rd_size);
> > + ll_wr_sz_aligned = PAGE_ALIGN(ll_wr_size);
> > + edma->total_size = PAGE_SIZE + reg_sz_aligned + ll_rd_sz_aligned +
> > + ll_wr_sz_aligned;
> > + size = roundup_pow_of_two(edma->total_size);
> > +
> > + info = pci_epf_alloc_space(epf, size, edma->bar,
> > + epc_features, PRIMARY_INTERFACE);
> > + if (!info) {
> > + ret = -ENOMEM;
> > + goto err;
> > + }
> > + memset(info, 0, size);
> > +
> > + off = PAGE_SIZE;
> > + info->magic = cpu_to_le32(PCITEST_EDMA_INFO_MAGIC);
> > + info->version = cpu_to_le32(PCITEST_EDMA_INFO_VERSION);
> > +
> > + info->reg_off = cpu_to_le32(off);
> > + info->reg_size = cpu_to_le32(reg_size);
> > + off += reg_sz_aligned;
> > +
> > + info->ll_rd_phys = cpu_to_le64(ll_rd_phys);
> > + info->ll_rd_off = cpu_to_le32(off);
> > + info->ll_rd_size = cpu_to_le32(ll_rd_size);
> > + off += ll_rd_sz_aligned;
> > +
> > + info->ll_wr_phys = cpu_to_le64(ll_wr_phys);
> > + info->ll_wr_off = cpu_to_le32(off);
> > + info->ll_wr_size = cpu_to_le32(ll_wr_size);
> > + off += ll_wr_sz_aligned;
> > +
> > + info->test_buf_phys = cpu_to_le64(edma->test_buf_phys);
> > + info->test_buf_size = cpu_to_le32(edma->test_buf_size);
> > +
> > + edma->info = info;
> > + edma->reg_submap_sz = reg_sz_aligned;
> > + edma->ll_rd_phys = ll_rd_phys;
> > + edma->ll_wr_phys = ll_wr_phys;
> > + edma->ll_rd_sz_aligned = ll_rd_sz_aligned;
> > + edma->ll_wr_sz_aligned = ll_wr_sz_aligned;
> > +
> > + ret = pci_epc_set_bar(epc, epf->func_no, epf->vfunc_no,
> > + &epf->bar[edma->bar]);
> > + if (ret) {
> > + dev_err(dev,
> > + "failed to init BAR%d for remote eDMA: %d\n",
> > + edma->bar, ret);
> > + goto err;
> > + }
> > + dev_info(dev, "BAR%d initialized for remote eDMA\n", edma->bar);
> > +
> > + return 0;
> > +
> > +err:
> > + pci_epf_test_clean_remote_edma(test);
> > + devm_kfree(&epf->dev, edma);
> > + test->data = NULL;
> > + return ret;
> > +}
> > +
> > +static int pci_epf_test_map_remote_edma(struct pci_epf_test *test)
> > +{
> > + struct pci_epf_test_edma *edma = test->data;
> > + struct pcitest_edma_info *info;
> > + struct pci_epf *epf = test->epf;
> > + struct pci_epc *epc = epf->epc;
> > + struct pci_epf_bar *bar;
> > + enum pci_barno barno;
> > + struct device *dev = epc->dev.parent;
> > + int ret;
> > +
> > + if (!edma)
> > + return -ENODEV;
> > +
> > + info = edma->info;
> > + barno = edma->bar;
> > +
> > + if (barno == NO_BAR)
> > + return -ENOSPC;
> > + if (!info || !edma->test_buf)
> > + return -ENODEV;
> > +
> > + bar = &epf->bar[barno];
> > + pci_epf_test_clear_submaps(bar);
> > +
> > + ret = pci_epf_test_add_submap(bar, bar->phys_addr, PAGE_SIZE);
> > + if (ret)
> > + return ret;
> > +
> > + ret = pci_epf_test_add_submap(bar, edma->reg_phys, edma->reg_submap_sz);
> > + if (ret)
> > + goto err_submap;
> > +
> > + ret = pci_epf_test_add_submap(bar, edma->ll_rd_phys,
> > + edma->ll_rd_sz_aligned);
> > + if (ret)
> > + goto err_submap;
> > +
> > + ret = pci_epf_test_add_submap(bar, edma->ll_wr_phys,
> > + edma->ll_wr_sz_aligned);
> > + if (ret)
> > + goto err_submap;
> > +
> > + if (bar->size > edma->total_size) {
> > + ret = pci_epf_test_add_submap(bar, 0,
> > + bar->size - edma->total_size);
> > + if (ret)
> > + goto err_submap;
> > + }
> > +
> > + ret = pci_epc_set_bar(epc, epf->func_no, epf->vfunc_no, bar);
> > + if (ret) {
> > + dev_err(dev, "failed to map BAR%d: %d\n", barno, ret);
> > + goto err_submap;
> > + }
> > +
> > + /*
> > + * Endpoint-local interrupts must be ignored even if the host fails to
> > + * mask them.
> > + */
> > + ret = dw_edma_chan_irq_config(test->dma_chan_tx, DW_EDMA_CH_IRQ_REMOTE);
> > + if (ret) {
> > + dev_err(dev, "failed to set irq mode for tx channel: %d\n",
> > + ret);
> > + goto err_bar;
> > + }
> > + ret = dw_edma_chan_irq_config(test->dma_chan_rx, DW_EDMA_CH_IRQ_REMOTE);
> > + if (ret) {
> > + dev_err(dev, "failed to set irq mode for rx channel: %d\n",
> > + ret);
> > + goto err_bar;
> > + }
> > +
> > + return 0;
> > +err_bar:
> > + pci_epc_clear_bar(epc, epf->func_no, epf->vfunc_no, &epf->bar[barno]);
> > +err_submap:
> > + pci_epf_test_clear_submaps(bar);
> > + return ret;
> > +}
> > +
> > +static void pci_epf_test_remote_edma_setup(struct pci_epf_test *epf_test,
> > + struct pci_epf_test_reg *reg)
> > +{
> > + struct pci_epf_test_edma *edma = epf_test->data;
> > + size_t size = le32_to_cpu(reg->size);
> > + void *buf;
> > + int ret;
> > +
> > + if (!edma || !edma->test_buf || size > edma->test_buf_size) {
> > + reg->status = cpu_to_le32(STATUS_REMOTE_EDMA_SETUP_FAIL);
> > + return;
> > + }
> > +
> > + buf = edma->test_buf;
> > +
> > + if (!edma->enabled) {
> > + /* NB. Currently DW eDMA is the only supported backend */
> > + ret = pci_epf_test_map_remote_edma(epf_test);
> > + if (ret) {
> > + WRITE_ONCE(reg->status,
> > + cpu_to_le32(STATUS_REMOTE_EDMA_SETUP_FAIL));
> > + return;
> > + }
> > + edma->enabled = true;
> > + }
> > +
> > + /* Populate the test buffer with random data */
> > + get_random_bytes(buf, size);
> > + reg->checksum = cpu_to_le32(crc32_le(~0, buf, size));
> > +
> > + WRITE_ONCE(reg->status, cpu_to_le32(STATUS_REMOTE_EDMA_SETUP_SUCCESS));
> > +}
> > +
> > +static void pci_epf_test_remote_edma_checksum(struct pci_epf_test *epf_test,
> > + struct pci_epf_test_reg *reg)
> > +{
> > + struct pci_epf_test_edma *edma = epf_test->data;
> > + u32 status = le32_to_cpu(reg->status);
> > + size_t size;
> > + void *addr;
> > + u32 crc32;
> > +
> > + size = le32_to_cpu(reg->size);
> > + if (!edma || !edma->test_buf || size > edma->test_buf_size) {
> > + status |= STATUS_REMOTE_EDMA_CHECKSUM_FAIL;
> > + reg->status = cpu_to_le32(status);
> > + return;
> > + }
> > +
> > + addr = edma->test_buf;
> > + crc32 = crc32_le(~0, addr, size);
> > + status |= STATUS_REMOTE_EDMA_CHECKSUM_SUCCESS;
> > +
> > + reg->checksum = cpu_to_le32(crc32);
> > + reg->status = cpu_to_le32(status);
> > +}
> > +
> > +static void pci_epf_test_reset_dma_chan(struct dma_chan *chan)
> > +{
> > + dw_edma_chan_irq_config(chan, DW_EDMA_CH_IRQ_DEFAULT);
> > +}
> > +#else
> > +static bool pci_epf_test_bar_is_reserved(struct pci_epf_test *test,
> > + enum pci_barno barno)
> > +{
> > + return false;
> > +}
> > +
> > +static void pci_epf_test_clean_remote_edma(struct pci_epf_test *test)
> > +{
> > +}
> > +
> > +static int pci_epf_test_init_remote_edma(struct pci_epf_test *test)
> > +{
> > + return -EOPNOTSUPP;
> > +}
> > +
> > +static void pci_epf_test_remote_edma_setup(struct pci_epf_test *epf_test,
> > + struct pci_epf_test_reg *reg)
> > +{
> > + reg->status = cpu_to_le32(STATUS_REMOTE_EDMA_SETUP_FAIL);
> > +}
> > +
> > +static void pci_epf_test_remote_edma_checksum(struct pci_epf_test *epf_test,
> > + struct pci_epf_test_reg *reg)
> > +{
> > + reg->status = cpu_to_le32(STATUS_REMOTE_EDMA_CHECKSUM_FAIL);
> > +}
> > +
> > +static void pci_epf_test_reset_dma_chan(struct dma_chan *chan)
> > +{
> > +}
> > +#endif
> > +
> > static void pci_epf_test_dma_callback(void *param)
> > {
> > struct pci_epf_test *epf_test = param;
> > @@ -168,6 +626,8 @@ static int pci_epf_test_data_transfer(struct pci_epf_test *epf_test,
> > return -EINVAL;
> > }
> >
> > + pci_epf_test_reset_dma_chan(chan);
> > +
> > if (epf_test->dma_private) {
> > sconf.direction = dir;
> > if (dir == DMA_MEM_TO_DEV)
> > @@ -870,6 +1330,14 @@ static void pci_epf_test_cmd_handler(struct work_struct *work)
> > pci_epf_test_disable_doorbell(epf_test, reg);
> > pci_epf_test_raise_irq(epf_test, reg);
> > break;
> > + case COMMAND_REMOTE_EDMA_SETUP:
> > + pci_epf_test_remote_edma_setup(epf_test, reg);
> > + pci_epf_test_raise_irq(epf_test, reg);
> > + break;
> > + case COMMAND_REMOTE_EDMA_CHECKSUM:
> > + pci_epf_test_remote_edma_checksum(epf_test, reg);
> > + pci_epf_test_raise_irq(epf_test, reg);
> > + break;
> > default:
> > dev_err(dev, "Invalid command 0x%x\n", command);
> > break;
> > @@ -961,6 +1429,10 @@ static int pci_epf_test_epc_init(struct pci_epf *epf)
> > if (ret)
> > epf_test->dma_supported = false;
> >
> > + ret = pci_epf_test_init_remote_edma(epf_test);
> > + if (ret && ret != -EOPNOTSUPP)
> > + dev_warn(dev, "Remote eDMA setup failed\n");
> > +
> > if (epf->vfunc_no <= 1) {
> > ret = pci_epc_write_header(epc, epf->func_no, epf->vfunc_no, header);
> > if (ret) {
> > @@ -1007,6 +1479,7 @@ static void pci_epf_test_epc_deinit(struct pci_epf *epf)
> > struct pci_epf_test *epf_test = epf_get_drvdata(epf);
> >
> > cancel_delayed_work_sync(&epf_test->cmd_handler);
> > + pci_epf_test_clean_remote_edma(epf_test);
> > pci_epf_test_clean_dma_chan(epf_test);
> > pci_epf_test_clear_bar(epf);
> > }
> > @@ -1076,6 +1549,9 @@ static int pci_epf_test_alloc_space(struct pci_epf *epf)
> > if (bar == test_reg_bar)
> > continue;
> >
> > + if (pci_epf_test_bar_is_reserved(epf_test, bar))
> > + continue;
> > +
> > if (epc_features->bar[bar].type == BAR_FIXED)
> > test_reg_size = epc_features->bar[bar].fixed_size;
> > else
> > @@ -1146,6 +1622,7 @@ static void pci_epf_test_unbind(struct pci_epf *epf)
> >
> > cancel_delayed_work_sync(&epf_test->cmd_handler);
> > if (epc->init_complete) {
> > + pci_epf_test_clean_remote_edma(epf_test);
> > pci_epf_test_clean_dma_chan(epf_test);
> > pci_epf_test_clear_bar(epf);
> > }
> > --
> > 2.51.0
> >