write in 30M

hc

2024-02-20 ea08eeccae9297f7aabd2ef7f0c2517ac4549acc

 kernel/drivers/char/agp/parisc-agp.c
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@@ -90,6 +90,9 @@
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 {
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 	struct _parisc_agp_info *info = &parisc_agp_info;
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+	/* force fdc ops to be visible to IOMMU */
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+	asm_io_sync();
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+
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 	writeq(info->gart_base | ilog2(info->gart_size), info->ioc_regs+IOC_PCOM);
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 	readq(info->ioc_regs+IOC_PCOM);	/* flush */
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 }
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@@ -158,6 +161,7 @@
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 			info->gatt[j] =
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 				parisc_agp_mask_memory(agp_bridge,
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 					paddr, type);
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+			asm_io_fdc(&info->gatt[j]);
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 		}
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 	}
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@@ -191,7 +195,16 @@
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 parisc_agp_mask_memory(struct agp_bridge_data *bridge, dma_addr_t addr,
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 		       int type)
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 {
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-	return SBA_PDIR_VALID_BIT | addr;
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+	unsigned ci;			/* coherent index */
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+	dma_addr_t pa;
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+
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+	pa = addr & IOVP_MASK;
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+	asm("lci 0(%1), %0" : "=r" (ci) : "r" (phys_to_virt(pa)));
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+
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+	pa |= (ci >> PAGE_SHIFT) & 0xff;/* move CI (8 bits) into lowest byte */
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+	pa |= SBA_PDIR_VALID_BIT;	/* set "valid" bit */
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+
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+	return cpu_to_le64(pa);
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 }
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 static void
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@@ -381,8 +394,6 @@
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 static int __init
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 parisc_agp_init(void)
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 {
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-	extern struct sba_device *sba_list;
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-
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 	int err = -1;
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 	struct parisc_device *sba = NULL, *lba = NULL;
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 	struct lba_device *lbadev = NULL;