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Commit fbfe8b6b authored by Jordan Crouse's avatar Jordan Crouse
Browse files

msm: kgsl: Make the "scratch" global buffer use a random GPU address 



Select a random global GPU address for the "scratch" buffer that is used
by the ringbuffer for various tasks.

Change-Id: Ic0dedbaddda71dbf9cb2adab3c6c33a24d6a604c
Signed-off-by: default avatarJordan Crouse <jcrouse@codeaurora.org>
parent 14ca0568

drivers/gpu/msm/adreno_ringbuffer.c

+1 −1
Original line number Diff line number Diff line
@@ -308,7 +308,7 @@ int adreno_ringbuffer_probe(struct adreno_device *adreno_dev) 


	if (!adreno_is_a3xx(adreno_dev)) {

		status = kgsl_allocate_global(device, &device->scratch,

				PAGE_SIZE, 0, 0, "scratch");

				PAGE_SIZE, 0, KGSL_MEMDESC_RANDOM, "scratch");

		if (status != 0)

			return status;

	}

drivers/gpu/msm/kgsl.h

+2 −0
Original line number Diff line number Diff line
@@ -186,6 +186,8 @@ struct kgsl_memdesc_ops { 
#define KGSL_MEMDESC_CONTIG BIT(8)

/* This is an instruction buffer */

#define KGSL_MEMDESC_UCODE BIT(9)

/* For global buffers, randomly assign an address from the region */

#define KGSL_MEMDESC_RANDOM BIT(10)



/**

 * struct kgsl_memdesc - GPU memory object descriptor

drivers/gpu/msm/kgsl_iommu.c

+21 −4
Original line number Diff line number Diff line
@@ -8,6 +8,7 @@ 
#include <linux/of_platform.h>

#include <linux/seq_file.h>

#include <linux/delay.h>

#include <linux/random.h>

#include <soc/qcom/scm.h>

#include <soc/qcom/secure_buffer.h>
@@ -207,7 +208,7 @@ static void kgsl_iommu_remove_global(struct kgsl_mmu *mmu, 
static void kgsl_iommu_add_global(struct kgsl_mmu *mmu,

		struct kgsl_memdesc *memdesc, const char *name)

{

	int bit;

	u32 bit, start = 0;

	u64 size = kgsl_memdesc_footprint(memdesc);



	if (memdesc->gpuaddr != 0)
@@ -216,10 +217,26 @@ static void kgsl_iommu_add_global(struct kgsl_mmu *mmu, 
	if (WARN_ON(global_pt_count >= GLOBAL_PT_ENTRIES))

		return;



	if (WARN_ON(size > KGSL_IOMMU_GLOBAL_MEM_SIZE))

		return;



	if (memdesc->priv & KGSL_MEMDESC_RANDOM) {

		u32 range = GLOBAL_MAP_PAGES - (size >> PAGE_SHIFT);



		start = get_random_int() % range;

	}



	while (start >= 0) {

		bit = bitmap_find_next_zero_area(global_map, GLOBAL_MAP_PAGES,

		0, size >> PAGE_SHIFT, 0);

			start, size >> PAGE_SHIFT, 0);



		if (bit < GLOBAL_MAP_PAGES)

			break;



		start--;

	}



	if (WARN_ON(bit >= GLOBAL_MAP_PAGES))

	if (WARN_ON(start < 0))

		return;



	memdesc->gpuaddr =