mirrors/linux
2
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git synced 2026-08-31 09:20:13 -04:00
Code Issues Packages Projects Releases Wiki Activity

dmaengine: dw-edma-pcie: Handle optional data blocks

Browse Source 
Skip data block BAR mapping and debug output when a channel has no data
block size. This lets future providers describe channels that only need
descriptor memory exposed.

No functional change intended for existing Synopsys EDDA and
AMD (Xilinx) MDB/CPM6 devices. Their static channel descriptions still
provide data block sizes where data block windows are used. A zero-sized
data block now means "not present" for future metadata providers.

Reviewed-by: Frank Li <Frank.Li@nxp.com>
Signed-off-by: Koichiro Den <den@valinux.co.jp>
Link: https://patch.msgid.link/20260721062815.4117887-13-den@valinux.co.jp
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Koichiro Den
2026-07-21 15:28:13 +09:00
committed by Vinod Koul
parent 6f3328acab
commit 81964f5396
1 changed files with 20 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files

24
drivers/dma/dw-edma/dw-edma-pcie.c
View File

@@ -430,11 +430,13 @@ static int dw_edma_pcie_probe(struct pci_dev *pdev,
mask = BIT(dma_data->rg.bar);
for (i = 0; i < dma_data->wr_ch_cnt; i++) {
mask |= BIT(dma_data->ll_wr[i].bar);
mask |= BIT(dma_data->dt_wr[i].bar);
if (dma_data->dt_wr[i].sz)
mask |= BIT(dma_data->dt_wr[i].bar);
}
for (i = 0; i < dma_data->rd_ch_cnt; i++) {
mask |= BIT(dma_data->ll_rd[i].bar);
mask |= BIT(dma_data->dt_rd[i].bar);
if (dma_data->dt_rd[i].sz)
mask |= BIT(dma_data->dt_rd[i].bar);
}
err = pcim_iomap_regions(pdev, mask, pci_name(pdev));
if (err) {
@@ -497,6 +499,9 @@ static int dw_edma_pcie_probe(struct pci_dev *pdev,
ll_block);
ll_region->sz = ll_block->sz;
if (!dt_block->sz)
continue;
dt_region->vaddr.io = pcim_iomap_table(pdev)[dt_block->bar];
if (!dt_region->vaddr.io)
return -ENOMEM;
@@ -522,6 +527,9 @@ static int dw_edma_pcie_probe(struct pci_dev *pdev,
ll_block);
ll_region->sz = ll_block->sz;
if (!dt_block->sz)
continue;
dt_region->vaddr.io = pcim_iomap_table(pdev)[dt_block->bar];
if (!dt_region->vaddr.io)
return -ENOMEM;
@@ -555,10 +563,14 @@ static int dw_edma_pcie_probe(struct pci_dev *pdev,
dma_data->ll_wr[i].off, chip->ll_region_wr[i].sz,
chip->ll_region_wr[i].vaddr.io, &chip->ll_region_wr[i].paddr);
if (!dma_data->dt_wr[i].sz)
continue;
pci_dbg(pdev, "Data:\tWRITE CH%.2u, BAR=%u, off=0x%.8lx, sz=0x%zx bytes, addr(v=%p, p=%pa)\n",
i, dma_data->dt_wr[i].bar,
dma_data->dt_wr[i].off, chip->dt_region_wr[i].sz,
chip->dt_region_wr[i].vaddr.io, &chip->dt_region_wr[i].paddr);
chip->dt_region_wr[i].vaddr.io,
&chip->dt_region_wr[i].paddr);
}
for (i = 0; i < chip->ll_rd_cnt; i++) {
@@ -567,10 +579,14 @@ static int dw_edma_pcie_probe(struct pci_dev *pdev,
dma_data->ll_rd[i].off, chip->ll_region_rd[i].sz,
chip->ll_region_rd[i].vaddr.io, &chip->ll_region_rd[i].paddr);
if (!dma_data->dt_rd[i].sz)
continue;
pci_dbg(pdev, "Data:\tREAD CH%.2u, BAR=%u, off=0x%.8lx, sz=0x%zx bytes, addr(v=%p, p=%pa)\n",
i, dma_data->dt_rd[i].bar,
dma_data->dt_rd[i].off, chip->dt_region_rd[i].sz,
chip->dt_region_rd[i].vaddr.io, &chip->dt_region_rd[i].paddr);
chip->dt_region_rd[i].vaddr.io,
&chip->dt_region_rd[i].paddr);
}
pci_dbg(pdev, "Nr. IRQs:\t%u\n", chip->nr_irqs);