commit 99678f89b5fd0390cac0da6aa8b4d86d762ba6fb
author Tarun Karra <tkarra@codeaurora.org> Wed Feb 13 13:57:25 2013 -0800
committer Rajeev Kulkarni <krajeev@codeaurora.org> Thu Feb 14 13:45:17 2013 -0800
tree 50e7289f936144257e2c7dcd3b2965764328d8c3
parent b810732044cdf9c3b9f2cfff3d9b89d07c8f4faf

msm: kgsl: Allow pagefault policy to be controlled by userspace

GPU pagefault policy can be set to below options:
   a) enable/disable GPU HALT on pagefaults
   b) log only one pagefault per page.
GPU pagefault policy can be controled using panel file
and debugfs.

Change-Id: I0613e0d087fc45eb5e519e1c834a33f32376672f
Signed-off-by: Tarun Karra <tkarra@codeaurora.org>

drivers/gpu/msm/kgsl_iommu.c

diff --git a/drivers/gpu/msm/kgsl_iommu.c b/drivers/gpu/msm/kgsl_iommu.c
index a143971..f2393e4 100644
--- a/drivers/gpu/msm/kgsl_iommu.c
+++ b/drivers/gpu/msm/kgsl_iommu.c
@@ -110,7 +110,8 @@
 	struct kgsl_iommu_device *iommu_dev;
 	unsigned int ptbase, fsr;
 	struct kgsl_device *device;
-	unsigned int no_page_fault_log;
+	struct adreno_device *adreno_dev;
+	unsigned int no_page_fault_log = 0;
 
 	ret = get_iommu_unit(dev, &mmu, &iommu_unit);
 	if (ret)
@@ -123,6 +124,7 @@
 	}
 	iommu = mmu->priv;
 	device = mmu->device;
+	adreno_dev = ADRENO_DEVICE(device);
 
 	ptbase = KGSL_IOMMU_GET_CTX_REG(iommu, iommu_unit,
 					iommu_dev->ctx_id, TTBR0);
@@ -130,7 +132,8 @@
 	fsr = KGSL_IOMMU_GET_CTX_REG(iommu, iommu_unit,
 		iommu_dev->ctx_id, FSR);
 
-	no_page_fault_log = kgsl_mmu_log_fault_addr(mmu, ptbase, addr);
+	if (adreno_dev->ft_pf_policy & KGSL_FT_PAGEFAULT_LOG_ONE_PER_PAGE)
+		no_page_fault_log = kgsl_mmu_log_fault_addr(mmu, ptbase, addr);
 
 	if (!no_page_fault_log) {
 		KGSL_MEM_CRIT(iommu_dev->kgsldev,
@@ -152,7 +155,8 @@
 	 * the GPU and trigger a snapshot. To stall the transaction return
 	 * EBUSY error.
 	 */
-	ret = -EBUSY;
+	if (adreno_dev->ft_pf_policy & KGSL_FT_PAGEFAULT_GPUHALT_ENABLE)
+		ret = -EBUSY;
 done:
 	return ret;
 }