From 10ebd8556b7990499c896a550e3d416b444211e6 Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Fri, 10 May 2024 02:23:07 +0000
Subject: [PATCH] add led
---
kernel/arch/parisc/kernel/pci-dma.c | 18 +++++++++++++++++-
1 files changed, 17 insertions(+), 1 deletions(-)
diff --git a/kernel/arch/parisc/kernel/pci-dma.c b/kernel/arch/parisc/kernel/pci-dma.c
index 36610a5..fc90ccf 100644
--- a/kernel/arch/parisc/kernel/pci-dma.c
+++ b/kernel/arch/parisc/kernel/pci-dma.c
@@ -446,11 +446,27 @@
void arch_sync_dma_for_device(phys_addr_t paddr, size_t size,
enum dma_data_direction dir)
{
+ /*
+ * fdc: The data cache line is written back to memory, if and only if
+ * it is dirty, and then invalidated from the data cache.
+ */
flush_kernel_dcache_range((unsigned long)phys_to_virt(paddr), size);
}
void arch_sync_dma_for_cpu(phys_addr_t paddr, size_t size,
enum dma_data_direction dir)
{
- flush_kernel_dcache_range((unsigned long)phys_to_virt(paddr), size);
+ unsigned long addr = (unsigned long) phys_to_virt(paddr);
+
+ switch (dir) {
+ case DMA_TO_DEVICE:
+ case DMA_BIDIRECTIONAL:
+ flush_kernel_dcache_range(addr, size);
+ return;
+ case DMA_FROM_DEVICE:
+ purge_kernel_dcache_range_asm(addr, addr + size);
+ return;
+ default:
+ BUG();
+ }
}
--
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