diff options
| author | Matthew Rosato <mjrosato@linux.ibm.com> | 2025-02-12 16:34:16 -0500 |
|---|---|---|
| committer | Joerg Roedel <jroedel@suse.de> | 2025-02-21 12:01:58 +0100 |
| commit | d236843a6964dc5a55dbafa5cfae63bc99cf10f8 (patch) | |
| tree | be286b34289dc2cc2b720b4fbff0b6654f087688 | |
| parent | 6d52cb738a98df6d5a91d96ce5bc557d24343964 (diff) | |
s390/pci: store DMA offset in bus_dma_region
PCI devices on s390 have a DMA offset that is reported via CLP. In
preparation for allowing identity domains, setup the bus_dma_region
for all PCI devices using the reported CLP value.
Signed-off-by: Matthew Rosato <mjrosato@linux.ibm.com>
Reviewed-by: Niklas Schnelle <schnelle@linux.ibm.com>
Tested-by: Niklas Schnelle <schnelle@linux.ibm.com>
Link: https://lore.kernel.org/r/20250212213418.182902-3-mjrosato@linux.ibm.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
| -rw-r--r-- | arch/s390/pci/pci_bus.c | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/arch/s390/pci/pci_bus.c b/arch/s390/pci/pci_bus.c index 39a481ec4a40..0e725039861f 100644 --- a/arch/s390/pci/pci_bus.c +++ b/arch/s390/pci/pci_bus.c @@ -19,6 +19,7 @@ #include <linux/jump_label.h> #include <linux/pci.h> #include <linux/printk.h> +#include <linux/dma-direct.h> #include <asm/pci_clp.h> #include <asm/pci_dma.h> @@ -283,10 +284,34 @@ static struct zpci_bus *zpci_bus_alloc(int topo, bool topo_is_tid) return zbus; } +static void pci_dma_range_setup(struct pci_dev *pdev) +{ + struct zpci_dev *zdev = to_zpci(pdev); + struct bus_dma_region *map; + u64 aligned_end; + + map = kzalloc(sizeof(*map), GFP_KERNEL); + if (!map) + return; + + map->cpu_start = 0; + map->dma_start = PAGE_ALIGN(zdev->start_dma); + aligned_end = PAGE_ALIGN_DOWN(zdev->end_dma + 1); + if (aligned_end >= map->dma_start) + map->size = aligned_end - map->dma_start; + else + map->size = 0; + WARN_ON_ONCE(map->size == 0); + + pdev->dev.dma_range_map = map; +} + void pcibios_bus_add_device(struct pci_dev *pdev) { struct zpci_dev *zdev = to_zpci(pdev); + pci_dma_range_setup(pdev); + /* * With pdev->no_vf_scan the common PCI probing code does not * perform PF/VF linking. |