On Sat, Sep 28, 2019 at 11:44:36PM +0200, Sven Schnelle wrote:
> Hi List,
>
> i've spent quite some time this evening debugging why the Fire GL
> doesn't work in my C8000. As reading debug output didn't give me
> much insights, i decided to throw some Hardware at the Problem and
> connect a Logic Analyzer to the C8000. For that i switched to an old
> PCI Radeon 7000 which shows the same ring test failure.
below patch (with debug print left in) got PCI radeon working for me, when
I played with it last time. The added fdc is a real fix, while the change
in parisc_agp_mask_memory is just a hack. The big problem there is to get
virtual address where the memory is mapped to in user space...
Thomas.
diff --git a/drivers/char/agp/parisc-agp.c b/drivers/char/agp/parisc-agp.c
index 15f2e7025b78..756bc4a265d9 100644
--- a/drivers/char/agp/parisc-agp.c
+++ b/drivers/char/agp/parisc-agp.c
@@ -20,6 +20,7 @@
#include <linux/agp_backend.h>
#include <linux/log2.h>
#include <linux/slab.h>
+#include <linux/pagemap.h>
#include <asm/parisc-device.h>
#include <asm/ropes.h>
@@ -162,6 +163,16 @@ parisc_agp_insert_memory(struct agp_memory *mem, off_t pg_start, int type)
info->gatt[j] =
parisc_agp_mask_memory(agp_bridge,
paddr, type);
+ asm volatile("fdc %%r0(%0)" : : "r" (&info->gatt[j]));
+#if 0
+#if 0
+ printk("i %x j %lx page %p va %lx paddr %lx gatt %lx\n",
+ i, j, mem->pages[i], __va(paddr), paddr, info->gatt[j]);
+#else
+ printk("i %x j %lx page %p va %lx paddr %lx\n",
+ i, j, mem->pages[i], __va(paddr), paddr);
+#endif
+#endif
}
}
@@ -184,7 +195,7 @@ parisc_agp_remove_memory(struct agp_memory *mem, off_t pg_start, int type)
io_pg_start = info->io_pages_per_kpage * pg_start;
io_pg_count = info->io_pages_per_kpage * mem->page_count;
for (i = io_pg_start; i < io_pg_count + io_pg_start; i++) {
- info->gatt[i] = agp_bridge->scratch_page;
+ // info->gatt[i] = agp_bridge->scratch_page;
}
agp_bridge->driver->tlb_flush(mem);
@@ -195,7 +206,22 @@ static unsigned long
parisc_agp_mask_memory(struct agp_bridge_data *bridge, dma_addr_t addr,
int type)
{
- return SBA_PDIR_VALID_BIT | addr;
+#if 1
+ u64 pa;
+ register unsigned ci; /* coherent index */
+
+ pa = addr & IOVP_MASK;
+ mtsp(0,1);
+ asm("lci 0(%%sr1, %1), %0" : "=r" (ci) : "r" (__va(pa)));
+
+ pa |= (ci >> PAGE_SHIFT) & 0xff; /* move CI (8 bits) into lowest byte */
+
+ pa |= SBA_PDIR_VALID_BIT; /* set "valid" bit */
+
+ return cpu_to_le64(pa);
+#else
+ return cpu_to_le64(SBA_PDIR_VALID_BIT | addr);
+#endif
}
static void
--
Crap can work. Given enough thrust pigs will fly, but it's not necessarily a
good idea. [ RFC1925, 2.3 ]
