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PCI: Add data integrity check for PCIe DMA

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Add CRC check after PCIe DMA to verify data integrity.

Bug 3636902
Bug 3868928

Change-Id: If497ce769571c6c837acbfbbb64b2242dfabef26
Signed-off-by: Manikanta Maddireddy <mmaddireddy@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvidia/+/2718787
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvidia/+/2720336
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nv-oot/+/2815927
Reviewed-by: Nagarjuna Kristam <nkristam@nvidia.com>
Reviewed-by: Bitan Biswas <bbiswas@nvidia.com>
Tested-by: Nagarjuna Kristam <nkristam@nvidia.com>
GVS: Gerrit_Virtual_Submit <buildbot_gerritrpt@nvidia.com>
This commit is contained in:
Manikanta Maddireddy
2022-05-26 18:03:48 +05:30
committed by mobile promotions
parent b26885400f
commit 319fa69bd5
3 changed files with 71 additions and 14 deletions
Download Patch File Download Diff File Expand all files Collapse all files

22
drivers/pci/endpoint/functions/pci-epf-dma-test.c
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@@ -23,6 +23,8 @@ static struct pcie_epf_dma *gepfnv;
struct pcie_epf_dma {
struct pci_epf_header header;
struct pci_epf *epf;
struct pci_epc *epc;
struct device *fdev;
struct device *cdev;
void *bar0_virt;
@@ -74,10 +76,10 @@ struct edma_desc {
static irqreturn_t pcie_dma_epf_wr0_msi(int irq, void *arg)
{
struct pcie_epf_dma *epfnv = (struct pcie_epf_dma *)arg;
int bit = 0;
struct pcie_epf_bar0 *epf_bar0 = (struct pcie_epf_bar0 *)epfnv->bar0_virt;
epfnv->wr_busy &= ~BIT(bit);
wake_up(&epfnv->wr_wq[bit]);
epf_bar0->wr_data[0].crc = crc32_le(~0, epfnv->bar0_virt + SZ_128M + BAR0_DMA_BUF_OFFSET,
epf_bar0->wr_data[0].size);
return IRQ_HANDLED;
}
@@ -881,6 +883,13 @@ fail:
return 0;
}
static void edma_lib_test_raise_irq(void *p)
{
struct pcie_epf_dma *epfnv = (struct pcie_epf_dma *)p;
lpci_epc_raise_irq(epfnv->epc, epfnv->epf->func_no, PCI_EPC_IRQ_MSI, 1);
}
/* debugfs to perform eDMA lib transfers and do CRC check */
static int edmalib_test(struct seq_file *s, void *data)
{
@@ -897,7 +906,7 @@ static int edmalib_test(struct seq_file *s, void *data)
epfnv->edma.src_dma_addr = epf_bar0->ep_phy_addr + BAR0_DMA_BUF_OFFSET;
epfnv->edma.dst_dma_addr = epf_bar0->rp_phy_addr + BAR0_DMA_BUF_OFFSET;
epfnv->edma.fdev = epfnv->fdev;
epfnv->edma.bar0_virt = epfnv->bar0_virt;
epfnv->edma.epf_bar0 = (struct pcie_epf_bar0 *)epfnv->bar0_virt;
epfnv->edma.src_virt = epfnv->bar0_virt + BAR0_DMA_BUF_OFFSET;
epfnv->edma.dma_base = epfnv->dma_base;
epfnv->edma.dma_size = epfnv->dma_size;
@@ -905,6 +914,8 @@ static int edmalib_test(struct seq_file *s, void *data)
epfnv->edma.edma_ch = epfnv->edma_ch;
epfnv->edma.nents = epfnv->nents;
epfnv->edma.of_node = epfnv->cdev->of_node;
epfnv->edma.priv = (void *)epfnv;
epfnv->edma.raise_irq = edma_lib_test_raise_irq;
return edmalib_common_test(&epfnv->edma);
}
@@ -1554,7 +1565,6 @@ static void pcie_dma_epf_unbind(struct pci_epf *epf)
{
struct pcie_epf_dma *epfnv = epf_get_drvdata(epf);
struct pci_epc *epc = epf->epc;
struct pci_epf_bar *epf_bar = &epf->bar[BAR_0];
void *cookie = epfnv->edma.cookie;
struct pcie_epf_bar0 *epf_bar0 = (struct pcie_epf_bar0 *) epfnv->bar0_virt;
@@ -1584,6 +1594,8 @@ static int pcie_dma_epf_bind(struct pci_epf *epf)
epfnv->fdev = fdev;
epfnv->cdev = cdev;
epfnv->epf = epf;
epfnv->epc = epc;
epfnv->bar0_virt = lpci_epf_alloc_space(epf, BAR0_SIZE, BAR_0, SZ_64K);
if (!epfnv->bar0_virt) {