[PATCH RESEND] riscv: enable generic PCI resource mapping

[Palmer Dabbelt]

From: Stanislaw Kardach <kda at semihalf.com>

Enable the PCI resource mapping on RISC-V using the generic framework.
This allows userspace applications to mmap PCI resources using
/sys/devices/pci*/*/resource* interface.
The mmap has been tested with Intel x520-DA2 NIC card on a HiFive
Unmatched board (SiFive FU740 SoC).

Signed-off-by: Stanislaw Kardach <kda at semihalf.com>
Signed-off-by: Palmer Dabbelt <palmerdabbelt at google.com>
---
David, who was CC'd on the original patch, pointed out I missed this one.  For
some reason it's not in my inbox, I'm not entirely sure why as it landed on
lore:
https://lore.kernel.org/linux-riscv/20210412111012.675957-1-kda@semihalf.com/ .
Given the discrepency I thought it would be best to just send this out again.

I've put this on for-next.

Thanks!
---
 arch/riscv/include/asm/pci.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/riscv/include/asm/pci.h b/arch/riscv/include/asm/pci.h
index 658e112c3ce7..7fd52a30e605 100644
--- a/arch/riscv/include/asm/pci.h
+++ b/arch/riscv/include/asm/pci.h
@@ -18,6 +18,8 @@
 /* RISC-V shim does not initialize PCI bus */
 #define pcibios_assign_all_busses() 1
 
+#define ARCH_GENERIC_PCI_MMAP_RESOURCE 1
+
 extern int isa_dma_bridge_buggy;
 
 #ifdef CONFIG_PCI
-- 
2.31.1.818.g46aad6cb9e-goog