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Subject[PATCH 2/5] lguest guest feedback tidyups
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Date
1) send-dma and bind-dma hypercall wrappers for drivers to use,
2) formalization of the convention that devices can use the irq
corresponding to their index on the lguest_bus.
3) ___force to shut up sparse: guests *can* use ioremap as virtual mem.
4) lguest.c should include "lguest_bus.h" for lguest_devices declaration.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
---
drivers/lguest/lguest.c | 20 ++++++++++++++++++++
drivers/lguest/lguest_bus.c | 2 +-
include/linux/lguest_bus.h | 13 ++++++++++++-
3 files changed, 33 insertions(+), 2 deletions(-)
===================================================================
--- a/include/linux/lguest_bus.h
+++ b/include/linux/lguest_bus.h
@@ -7,7 +7,6 @@

struct lguest_device {
/* Unique busid, and index into lguest_page->devices[] */
- /* By convention, each device can use irq index+1 if it wants to. */
unsigned int index;

struct device dev;
@@ -15,6 +14,18 @@ struct lguest_device {
/* Driver can hang data off here. */
void *private;
};
+
+/* By convention, each device can use irq index+1 if it wants to. */
+static inline int lgdev_irq(const struct lguest_device *dev)
+{
+ return dev->index + 1;
+}
+
+/* dma args must not be vmalloced! */
+void lguest_send_dma(unsigned long key, struct lguest_dma *dma);
+int lguest_bind_dma(unsigned long key, struct lguest_dma *dmas,
+ unsigned int num, u8 irq);
+void lguest_unbind_dma(unsigned long key, struct lguest_dma *dmas);

struct lguest_driver {
const char *name;
===================================================================
--- a/drivers/lguest/lguest.c
+++ b/drivers/lguest/lguest.c
@@ -27,6 +27,7 @@
#include <linux/interrupt.h>
#include <linux/lguest.h>
#include <linux/lguest_launcher.h>
+#include <linux/lguest_bus.h>
#include <asm/paravirt.h>
#include <asm/param.h>
#include <asm/page.h>
@@ -99,6 +100,25 @@ void async_hcall(unsigned long call,
next_call = 0;
}
local_irq_restore(flags);
+}
+
+void lguest_send_dma(unsigned long key, struct lguest_dma *dma)
+{
+ dma->used_len = 0;
+ hcall(LHCALL_SEND_DMA, key, __pa(dma), 0);
+}
+
+int lguest_bind_dma(unsigned long key, struct lguest_dma *dmas,
+ unsigned int num, u8 irq)
+{
+ if (!hcall(LHCALL_BIND_DMA, key, __pa(dmas), (num << 8) | irq))
+ return -ENOMEM;
+ return 0;
+}
+
+void lguest_unbind_dma(unsigned long key, struct lguest_dma *dmas)
+{
+ hcall(LHCALL_BIND_DMA, key, __pa(dmas), 0);
}

static unsigned long save_fl(void)
===================================================================
--- a/drivers/lguest/lguest_bus.c
+++ b/drivers/lguest/lguest_bus.c
@@ -136,7 +136,7 @@ static int __init lguest_bus_init(void)
return 0;

/* Devices are in page above top of "normal" mem. */
- lguest_devices = ioremap(max_pfn << PAGE_SHIFT, PAGE_SIZE);
+ lguest_devices = (__force void*)ioremap(max_pfn<<PAGE_SHIFT,PAGE_SIZE);

if (bus_register(&lguest_bus.bus) != 0
|| device_register(&lguest_bus.dev) != 0)

-
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