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SubjectRe: [PATCH] drm/msm/a6xx: Add support for using system cache on MMU500 based targets
On 2020-10-27 20:09, Jordan Crouse wrote:
> On Tue, Oct 27, 2020 at 12:38:02PM +0530, Sai Prakash Ranjan wrote:
>> On 2020-10-27 00:24, Jordan Crouse wrote:
>> >This is an extension to the series [1] to enable the System Cache (LLC)
>> >for
>> >Adreno a6xx targets.
>> >
>> >GPU targets with an MMU-500 attached have a slightly different process for
>> >enabling system cache. Use the compatible string on the IOMMU phandle
>> >to see if an MMU-500 is attached and modify the programming sequence
>> >accordingly.
>> >
>> >[1] https://patchwork.freedesktop.org/series/83037/
>> >
>> >Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>
>> >---
>> >
>> > drivers/gpu/drm/msm/adreno/a6xx_gpu.c | 46 +++++++++++++++++++++------
>> > drivers/gpu/drm/msm/adreno/a6xx_gpu.h | 1 +
>> > 2 files changed, 37 insertions(+), 10 deletions(-)
>> >
>> >diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
>> >b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
>> >index 95c98c642876..b7737732fbb6 100644
>> >--- a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
>> >+++ b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
>> >@@ -1042,6 +1042,8 @@ static void a6xx_llc_deactivate(struct a6xx_gpu
>> >*a6xx_gpu)
>> >
>> > static void a6xx_llc_activate(struct a6xx_gpu *a6xx_gpu)
>> > {
>> >+ struct adreno_gpu *adreno_gpu = &a6xx_gpu->base;
>> >+ struct msm_gpu *gpu = &adreno_gpu->base;
>> > u32 cntl1_regval = 0;
>> >
>> > if (IS_ERR(a6xx_gpu->llc_mmio))
>> >@@ -1055,11 +1057,17 @@ static void a6xx_llc_activate(struct a6xx_gpu
>> >*a6xx_gpu)
>> > (gpu_scid << 15) | (gpu_scid << 20);
>> > }
>> >
>> >+ /*
>> >+ * For targets with a MMU500, activate the slice but don't program the
>> >+ * register. The XBL will take care of that.
>> >+ */
>> > if (!llcc_slice_activate(a6xx_gpu->htw_llc_slice)) {
>> >- u32 gpuhtw_scid = llcc_get_slice_id(a6xx_gpu->htw_llc_slice);
>> >+ if (!a6xx_gpu->have_mmu500) {
>> >+ u32 gpuhtw_scid = llcc_get_slice_id(a6xx_gpu->htw_llc_slice);
>> >
>> >- gpuhtw_scid &= 0x1f;
>> >- cntl1_regval |= FIELD_PREP(GENMASK(29, 25), gpuhtw_scid);
>> >+ gpuhtw_scid &= 0x1f;
>> >+ cntl1_regval |= FIELD_PREP(GENMASK(29, 25), gpuhtw_scid);
>> >+ }
>> > }
>> >
>> > if (cntl1_regval) {
>> >@@ -1067,13 +1075,20 @@ static void a6xx_llc_activate(struct a6xx_gpu
>> >*a6xx_gpu)
>> > * Program the slice IDs for the various GPU blocks and GPU MMU
>> > * pagetables
>> > */
>> >- a6xx_llc_write(a6xx_gpu, REG_A6XX_CX_MISC_SYSTEM_CACHE_CNTL_1,
>> >cntl1_regval);
>> >-
>> >- /*
>> >- * Program cacheability overrides to not allocate cache lines on
>> >- * a write miss
>> >- */
>> >- a6xx_llc_rmw(a6xx_gpu, REG_A6XX_CX_MISC_SYSTEM_CACHE_CNTL_0, 0xF,
>> >0x03);
>> >+ if (a6xx_gpu->have_mmu500)
>> >+ gpu_rmw(gpu, REG_A6XX_GBIF_SCACHE_CNTL1, GENMASK(24, 0),
>> >+ cntl1_regval);
>> >+ else {
>> >+ a6xx_llc_write(a6xx_gpu,
>> >+ REG_A6XX_CX_MISC_SYSTEM_CACHE_CNTL_1, cntl1_regval);
>> >+
>> >+ /*
>> >+ * Program cacheability overrides to not allocate cache
>> >+ * lines on a write miss
>> >+ */
>> >+ a6xx_llc_rmw(a6xx_gpu,
>> >+ REG_A6XX_CX_MISC_SYSTEM_CACHE_CNTL_0, 0xF, 0x03);
>> >+ }
>> > }
>> > }
>> >
>> >@@ -1086,10 +1101,21 @@ static void a6xx_llc_slices_destroy(struct
>> >a6xx_gpu *a6xx_gpu)
>> > static void a6xx_llc_slices_init(struct platform_device *pdev,
>> > struct a6xx_gpu *a6xx_gpu)
>> > {
>> >+ struct device_node *phandle;
>> >+
>> > a6xx_gpu->llc_mmio = msm_ioremap(pdev, "cx_mem", "gpu_cx");
>> > if (IS_ERR(a6xx_gpu->llc_mmio))
>> > return;
>> >
>> >+ /*
>> >+ * There is a different programming path for targets with an mmu500
>> >+ * attached, so detect if that is the case
>> >+ */
>> >+ phandle = of_parse_phandle(pdev->dev.of_node, "iommus", 0);
>> >+ a6xx_gpu->have_mmu500 = (phandle &&
>> >+ of_device_is_compatible(phandle, "arm,mmu500"));
>> >+ of_node_put(phandle);
>> >+
>> > a6xx_gpu->llc_slice = llcc_slice_getd(LLCC_GPU);
>> > a6xx_gpu->htw_llc_slice = llcc_slice_getd(LLCC_GPUHTW);
>> >
>> >diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gpu.h
>> >b/drivers/gpu/drm/msm/adreno/a6xx_gpu.h
>> >index 9e6079af679c..e793d329e77b 100644
>> >--- a/drivers/gpu/drm/msm/adreno/a6xx_gpu.h
>> >+++ b/drivers/gpu/drm/msm/adreno/a6xx_gpu.h
>> >@@ -32,6 +32,7 @@ struct a6xx_gpu {
>> > void __iomem *llc_mmio;
>> > void *llc_slice;
>> > void *htw_llc_slice;
>> >+ bool have_mmu500;
>> > };
>> >
>> > #define to_a6xx_gpu(x) container_of(x, struct a6xx_gpu, base)
>>
>> Thanks Jordan for the patch.
>
> If it makes your life or Rob's life easier, please feel free to squash
> them.
>

Sure, I will squash them in the next version with a change
which Robin pointed out.

Thanks,
Sai

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