* [PATCH v6 1/2] dt-bindings: display: msm: Convert GMU bindings to YAML
2020-03-20 3:36 [PATCH v6 0/2] msm/gpu/a6xx: use the DMA-API for GMU memory allocations Jordan Crouse
@ 2020-03-20 3:36 ` Jordan Crouse
2020-03-20 3:36 ` [PATCH v6 2/2] drm/msm/a6xx: Use the DMA API for GMU memory objects Jordan Crouse
1 sibling, 0 replies; 3+ messages in thread
From: Jordan Crouse @ 2020-03-20 3:36 UTC (permalink / raw)
To: linux-arm-msm
Cc: devicetree, David Airlie, freedreno, smasetty, linux-kernel,
dri-devel, Rob Herring, Sean Paul, Brian Masney
Convert display/msm/gmu.txt to display/msm/gmu.yaml and remove the old
text bindings. The 'sram' text from the old binding never applied to
the GMU so it was not converted but all the other properties were correct.
Acked-by: Sam Ravnborg <sam@ravnborg.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>
---
.../devicetree/bindings/display/msm/gmu.txt | 65 ---------
.../devicetree/bindings/display/msm/gmu.yaml | 123 ++++++++++++++++++
2 files changed, 123 insertions(+), 65 deletions(-)
delete mode 100644 Documentation/devicetree/bindings/display/msm/gmu.txt
create mode 100644 Documentation/devicetree/bindings/display/msm/gmu.yaml
diff --git a/Documentation/devicetree/bindings/display/msm/gmu.txt b/Documentation/devicetree/bindings/display/msm/gmu.txt
deleted file mode 100644
index 90af5b0a56a9..000000000000
--- a/Documentation/devicetree/bindings/display/msm/gmu.txt
+++ /dev/null
@@ -1,65 +0,0 @@
-Qualcomm adreno/snapdragon GMU (Graphics management unit)
-
-The GMU is a programmable power controller for the GPU. the CPU controls the
-GMU which in turn handles power controls for the GPU.
-
-Required properties:
-- compatible: "qcom,adreno-gmu-XYZ.W", "qcom,adreno-gmu"
- for example: "qcom,adreno-gmu-630.2", "qcom,adreno-gmu"
- Note that you need to list the less specific "qcom,adreno-gmu"
- for generic matches and the more specific identifier to identify
- the specific device.
-- reg: Physical base address and length of the GMU registers.
-- reg-names: Matching names for the register regions
- * "gmu"
- * "gmu_pdc"
- * "gmu_pdc_seg"
-- interrupts: The interrupt signals from the GMU.
-- interrupt-names: Matching names for the interrupts
- * "hfi"
- * "gmu"
-- clocks: phandles to the device clocks
-- clock-names: Matching names for the clocks
- * "gmu"
- * "cxo"
- * "axi"
- * "mnoc"
-- power-domains: should be:
- <&clock_gpucc GPU_CX_GDSC>
- <&clock_gpucc GPU_GX_GDSC>
-- power-domain-names: Matching names for the power domains
-- iommus: phandle to the adreno iommu
-- operating-points-v2: phandle to the OPP operating points
-
-Example:
-
-/ {
- ...
-
- gmu: gmu@506a000 {
- compatible="qcom,adreno-gmu-630.2", "qcom,adreno-gmu";
-
- reg = <0x506a000 0x30000>,
- <0xb280000 0x10000>,
- <0xb480000 0x10000>;
- reg-names = "gmu", "gmu_pdc", "gmu_pdc_seq";
-
- interrupts = <GIC_SPI 304 IRQ_TYPE_LEVEL_HIGH>,
- <GIC_SPI 305 IRQ_TYPE_LEVEL_HIGH>;
- interrupt-names = "hfi", "gmu";
-
- clocks = <&gpucc GPU_CC_CX_GMU_CLK>,
- <&gpucc GPU_CC_CXO_CLK>,
- <&gcc GCC_DDRSS_GPU_AXI_CLK>,
- <&gcc GCC_GPU_MEMNOC_GFX_CLK>;
- clock-names = "gmu", "cxo", "axi", "memnoc";
-
- power-domains = <&gpucc GPU_CX_GDSC>,
- <&gpucc GPU_GX_GDSC>;
- power-domain-names = "cx", "gx";
-
- iommus = <&adreno_smmu 5>;
-
- operating-points-v2 = <&gmu_opp_table>;
- };
-};
diff --git a/Documentation/devicetree/bindings/display/msm/gmu.yaml b/Documentation/devicetree/bindings/display/msm/gmu.yaml
new file mode 100644
index 000000000000..0b8736a9384e
--- /dev/null
+++ b/Documentation/devicetree/bindings/display/msm/gmu.yaml
@@ -0,0 +1,123 @@
+# SPDX-License-Identifier: GPL-2.0-only
+# Copyright 2019-2020, The Linux Foundation, All Rights Reserved
+%YAML 1.2
+---
+
+$id: "http://devicetree.org/schemas/display/msm/gmu.yaml#"
+$schema: "http://devicetree.org/meta-schemas/core.yaml#"
+
+title: Devicetree bindings for the GMU attached to certain Adreno GPUs
+
+maintainers:
+ - Rob Clark <robdclark@gmail.com>
+
+description: |
+ These bindings describe the Graphics Management Unit (GMU) that is attached
+ to members of the Adreno A6xx GPU family. The GMU provides on-device power
+ management and support to improve power efficiency and reduce the load on
+ the CPU.
+
+properties:
+ compatible:
+ items:
+ - enum:
+ - qcom,adreno-gmu-630.2
+ - const: qcom,adreno-gmu
+
+ reg:
+ items:
+ - description: Core GMU registers
+ - description: GMU PDC registers
+ - description: GMU PDC sequence registers
+
+ reg-names:
+ items:
+ - const: gmu
+ - const: gmu_pdc
+ - const: gmu_pdc_seq
+
+ clocks:
+ items:
+ - description: GMU clock
+ - description: GPU CX clock
+ - description: GPU AXI clock
+ - description: GPU MEMNOC clock
+
+ clock-names:
+ items:
+ - const: gmu
+ - const: cxo
+ - const: axi
+ - const: memnoc
+
+ interrupts:
+ items:
+ - description: GMU HFI interrupt
+ - description: GMU interrupt
+
+
+ interrupt-names:
+ items:
+ - const: hfi
+ - const: gmu
+
+ power-domains:
+ items:
+ - description: CX power domain
+ - description: GX power domain
+
+ power-domain-names:
+ items:
+ - const: cx
+ - const: gx
+
+ iommus:
+ maxItems: 1
+
+ operating-points-v2: true
+
+required:
+ - compatible
+ - reg
+ - reg-names
+ - clocks
+ - clock-names
+ - interrupts
+ - interrupt-names
+ - power-domains
+ - power-domain-names
+ - iommus
+ - operating-points-v2
+
+examples:
+ - |
+ #include <dt-bindings/clock/qcom,gpucc-sdm845.h>
+ #include <dt-bindings/clock/qcom,gcc-sdm845.h>
+ #include <dt-bindings/interrupt-controller/irq.h>
+ #include <dt-bindings/interrupt-controller/arm-gic.h>
+
+ gmu: gmu@506a000 {
+ compatible="qcom,adreno-gmu-630.2", "qcom,adreno-gmu";
+
+ reg = <0x506a000 0x30000>,
+ <0xb280000 0x10000>,
+ <0xb480000 0x10000>;
+ reg-names = "gmu", "gmu_pdc", "gmu_pdc_seq";
+
+ clocks = <&gpucc GPU_CC_CX_GMU_CLK>,
+ <&gpucc GPU_CC_CXO_CLK>,
+ <&gcc GCC_DDRSS_GPU_AXI_CLK>,
+ <&gcc GCC_GPU_MEMNOC_GFX_CLK>;
+ clock-names = "gmu", "cxo", "axi", "memnoc";
+
+ interrupts = <GIC_SPI 304 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 305 IRQ_TYPE_LEVEL_HIGH>;
+ interrupt-names = "hfi", "gmu";
+
+ power-domains = <&gpucc GPU_CX_GDSC>,
+ <&gpucc GPU_GX_GDSC>;
+ power-domain-names = "cx", "gx";
+
+ iommus = <&adreno_smmu 5>;
+ operating-points-v2 = <&gmu_opp_table>;
+ };
--
2.17.1
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* [PATCH v6 2/2] drm/msm/a6xx: Use the DMA API for GMU memory objects
2020-03-20 3:36 [PATCH v6 0/2] msm/gpu/a6xx: use the DMA-API for GMU memory allocations Jordan Crouse
2020-03-20 3:36 ` [PATCH v6 1/2] dt-bindings: display: msm: Convert GMU bindings to YAML Jordan Crouse
@ 2020-03-20 3:36 ` Jordan Crouse
1 sibling, 0 replies; 3+ messages in thread
From: Jordan Crouse @ 2020-03-20 3:36 UTC (permalink / raw)
To: linux-arm-msm
Cc: David Airlie, freedreno, smasetty, Douglas Anderson, dri-devel,
Stephen Boyd, Christoph Hellwig, Michael J. Ruhl, Sean Paul,
linux-kernel
The GMU has very few memory allocations and uses a flat memory space so
there is no good reason to go out of our way to bypass the DMA APIs which
were basically designed for this exact scenario.
v7: Check return value of dma_set_mask_and_coherent
v4: Use dma_alloc_wc()
v3: Set the dma mask correctly and use dma_addr_t for the iova type
v2: Pass force_dma false to of_dma_configure to require that the DMA
region be set up and return error from of_dma_configure to fail probe.
Reviewed-by: Michael J. Ruhl <michael.j.ruhl@intel.com>
Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>
---
drivers/gpu/drm/msm/adreno/a6xx_gmu.c | 115 +++-----------------------
drivers/gpu/drm/msm/adreno/a6xx_gmu.h | 6 +-
2 files changed, 14 insertions(+), 107 deletions(-)
diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gmu.c b/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
index 748cd379065f..c4e71abbdd53 100644
--- a/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
+++ b/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
@@ -2,6 +2,7 @@
/* Copyright (c) 2017-2019 The Linux Foundation. All rights reserved. */
#include <linux/clk.h>
+#include <linux/dma-mapping.h>
#include <linux/interconnect.h>
#include <linux/pm_domain.h>
#include <linux/pm_opp.h>
@@ -920,21 +921,10 @@ int a6xx_gmu_stop(struct a6xx_gpu *a6xx_gpu)
static void a6xx_gmu_memory_free(struct a6xx_gmu *gmu, struct a6xx_gmu_bo *bo)
{
- int count, i;
- u64 iova;
-
if (IS_ERR_OR_NULL(bo))
return;
- count = bo->size >> PAGE_SHIFT;
- iova = bo->iova;
-
- for (i = 0; i < count; i++, iova += PAGE_SIZE) {
- iommu_unmap(gmu->domain, iova, PAGE_SIZE);
- __free_pages(bo->pages[i], 0);
- }
-
- kfree(bo->pages);
+ dma_free_wc(gmu->dev, bo->size, bo->virt, bo->iova);
kfree(bo);
}
@@ -942,7 +932,6 @@ static struct a6xx_gmu_bo *a6xx_gmu_memory_alloc(struct a6xx_gmu *gmu,
size_t size)
{
struct a6xx_gmu_bo *bo;
- int ret, count, i;
bo = kzalloc(sizeof(*bo), GFP_KERNEL);
if (!bo)
@@ -950,86 +939,14 @@ static struct a6xx_gmu_bo *a6xx_gmu_memory_alloc(struct a6xx_gmu *gmu,
bo->size = PAGE_ALIGN(size);
- count = bo->size >> PAGE_SHIFT;
+ bo->virt = dma_alloc_wc(gmu->dev, bo->size, &bo->iova, GFP_KERNEL);
- bo->pages = kcalloc(count, sizeof(struct page *), GFP_KERNEL);
- if (!bo->pages) {
+ if (!bo->virt) {
kfree(bo);
return ERR_PTR(-ENOMEM);
}
- for (i = 0; i < count; i++) {
- bo->pages[i] = alloc_page(GFP_KERNEL);
- if (!bo->pages[i])
- goto err;
- }
-
- bo->iova = gmu->uncached_iova_base;
-
- for (i = 0; i < count; i++) {
- ret = iommu_map(gmu->domain,
- bo->iova + (PAGE_SIZE * i),
- page_to_phys(bo->pages[i]), PAGE_SIZE,
- IOMMU_READ | IOMMU_WRITE);
-
- if (ret) {
- DRM_DEV_ERROR(gmu->dev, "Unable to map GMU buffer object\n");
-
- for (i = i - 1 ; i >= 0; i--)
- iommu_unmap(gmu->domain,
- bo->iova + (PAGE_SIZE * i),
- PAGE_SIZE);
-
- goto err;
- }
- }
-
- bo->virt = vmap(bo->pages, count, VM_IOREMAP,
- pgprot_writecombine(PAGE_KERNEL));
- if (!bo->virt)
- goto err;
-
- /* Align future IOVA addresses on 1MB boundaries */
- gmu->uncached_iova_base += ALIGN(size, SZ_1M);
-
return bo;
-
-err:
- for (i = 0; i < count; i++) {
- if (bo->pages[i])
- __free_pages(bo->pages[i], 0);
- }
-
- kfree(bo->pages);
- kfree(bo);
-
- return ERR_PTR(-ENOMEM);
-}
-
-static int a6xx_gmu_memory_probe(struct a6xx_gmu *gmu)
-{
- int ret;
-
- /*
- * The GMU address space is hardcoded to treat the range
- * 0x60000000 - 0x80000000 as un-cached memory. All buffers shared
- * between the GMU and the CPU will live in this space
- */
- gmu->uncached_iova_base = 0x60000000;
-
-
- gmu->domain = iommu_domain_alloc(&platform_bus_type);
- if (!gmu->domain)
- return -ENODEV;
-
- ret = iommu_attach_device(gmu->domain, gmu->dev);
-
- if (ret) {
- iommu_domain_free(gmu->domain);
- gmu->domain = NULL;
- }
-
- return ret;
}
/* Return the 'arc-level' for the given frequency */
@@ -1289,10 +1206,6 @@ void a6xx_gmu_remove(struct a6xx_gpu *a6xx_gpu)
a6xx_gmu_memory_free(gmu, gmu->hfi);
- iommu_detach_device(gmu->domain, gmu->dev);
-
- iommu_domain_free(gmu->domain);
-
free_irq(gmu->gmu_irq, gmu);
free_irq(gmu->hfi_irq, gmu);
@@ -1313,7 +1226,15 @@ int a6xx_gmu_init(struct a6xx_gpu *a6xx_gpu, struct device_node *node)
gmu->dev = &pdev->dev;
- of_dma_configure(gmu->dev, node, true);
+ /* Pass force_dma false to require the DT to set the dma region */
+ ret = of_dma_configure(gmu->dev, node, false);
+ if (ret)
+ return ret;
+
+ /* Set the mask after the of_dma_configure() */
+ ret = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(31));
+ if (ret)
+ return ret;
/* Fow now, don't do anything fancy until we get our feet under us */
gmu->idle_level = GMU_IDLE_STATE_ACTIVE;
@@ -1325,11 +1246,6 @@ int a6xx_gmu_init(struct a6xx_gpu *a6xx_gpu, struct device_node *node)
if (ret)
goto err_put_device;
- /* Set up the IOMMU context bank */
- ret = a6xx_gmu_memory_probe(gmu);
- if (ret)
- goto err_put_device;
-
/* Allocate memory for for the HFI queues */
gmu->hfi = a6xx_gmu_memory_alloc(gmu, SZ_16K);
if (IS_ERR(gmu->hfi))
@@ -1375,11 +1291,6 @@ int a6xx_gmu_init(struct a6xx_gpu *a6xx_gpu, struct device_node *node)
err_memory:
a6xx_gmu_memory_free(gmu, gmu->hfi);
- if (gmu->domain) {
- iommu_detach_device(gmu->domain, gmu->dev);
-
- iommu_domain_free(gmu->domain);
- }
ret = -ENODEV;
err_put_device:
diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gmu.h b/drivers/gpu/drm/msm/adreno/a6xx_gmu.h
index 2af91ed7ed0c..4af65a36d5ca 100644
--- a/drivers/gpu/drm/msm/adreno/a6xx_gmu.h
+++ b/drivers/gpu/drm/msm/adreno/a6xx_gmu.h
@@ -12,8 +12,7 @@
struct a6xx_gmu_bo {
void *virt;
size_t size;
- u64 iova;
- struct page **pages;
+ dma_addr_t iova;
};
/*
@@ -49,9 +48,6 @@ struct a6xx_gmu {
int hfi_irq;
int gmu_irq;
- struct iommu_domain *domain;
- u64 uncached_iova_base;
-
struct device *gxpd;
int idle_level;
--
2.17.1
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