The DSP might misbehave and write to the dummy memory. So let's make
sure that nobody else is using the pages related to it by grabbing a
full page.
Based on the analysis of Deepak Chitriki.
Signed-off-by: Felipe Contreras <felipe.contre...@gmail.com>
---
drivers/dsp/bridge/core/ue_deh.c | 11 +++--------
1 files changed, 3 insertions(+), 8 deletions(-)
diff --git a/drivers/dsp/bridge/core/ue_deh.c b/drivers/dsp/bridge/core/ue_deh.c
index 605f312..ab95916 100644
--- a/drivers/dsp/bridge/core/ue_deh.c
+++ b/drivers/dsp/bridge/core/ue_deh.c
@@ -53,8 +53,6 @@
#include "_tiomap_pwr.h"
#include <dspbridge/io_sm.h>
-#define ALIGN_DOWN(x, a) ((x)&(~((a)-1)))
-
/* GP Timer number to trigger interrupt for MMU-fault ISR on DSP */
#define GPTIMER_FOR_DSP_MMU_FAULT 8
/* Bit mask to enable overflow interrupt */
@@ -191,7 +189,6 @@ void bridge_deh_notify(struct deh_mgr *deh_mgr, u32
ulEventMask, u32 dwErrInfo)
{
struct bridge_dev_context *dev_context;
dsp_status status = DSP_SOK;
- u32 mem_physical = 0;
u32 hw_mmu_max_tlb_count = 31;
struct cfg_hostres *resources;
hw_status hw_status_obj;
@@ -227,9 +224,7 @@ void bridge_deh_notify(struct deh_mgr *deh_mgr, u32
ulEventMask, u32 dwErrInfo)
(unsigned int) deh_mgr->err_info.dw_val1,
(unsigned int) deh_mgr->err_info.dw_val2,
(unsigned int) fault_addr);
- dummy_va_addr = kzalloc(sizeof(char) * 0x1000, GFP_ATOMIC);
- mem_physical =
- ALIGN_DOWN(virt_to_phys(dummy_va_addr), PAGE_SIZE);
+ dummy_va_addr = (void*)__get_free_page(GFP_ATOMIC);
dev_context = (struct bridge_dev_context *)
deh_mgr->hbridge_context;
@@ -249,7 +244,7 @@ void bridge_deh_notify(struct deh_mgr *deh_mgr, u32
ulEventMask, u32 dwErrInfo)
if (DSP_SUCCEEDED(status)) {
hw_status_obj =
hw_mmu_tlb_add(resources->dw_dmmu_base,
- mem_physical, fault_addr,
+ virt_to_phys(dummy_va_addr),
fault_addr,
HW_PAGE_SIZE4KB, 1,
&map_attrs, HW_SET, HW_SET);
}
@@ -355,6 +350,6 @@ dsp_status bridge_deh_get_info(struct deh_mgr *deh_mgr,
void bridge_deh_release_dummy_mem(void)
{
- kfree(dummy_va_addr);
+ free_page((unsigned long)dummy_va_addr);
dummy_va_addr = NULL;
}
--
1.7.1
--
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