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.
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.
Signed-off-by: Jordan Crouse <[email protected]>
---
drivers/gpu/drm/msm/adreno/a6xx_gmu.c | 113 ++++------------------------------
drivers/gpu/drm/msm/adreno/a6xx_gmu.h | 6 +-
2 files changed, 12 insertions(+), 107 deletions(-)
diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gmu.c b/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
index 748cd37..dd51dd0 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 +1226,13 @@ 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() */
+ dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(31));
/* Fow now, don't do anything fancy until we get our feet under us */
gmu->idle_level = GMU_IDLE_STATE_ACTIVE;
@@ -1325,11 +1244,6 @@ 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 +1289,6 @@ 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 2af91ed..4af65a3 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;
--
2.7.4
>-----Original Message-----
>From: dri-devel <[email protected]> On Behalf Of
>Jordan Crouse
>Sent: Monday, March 2, 2020 3:48 PM
>To: [email protected]
>Cc: Douglas Anderson <[email protected]>; David Airlie
><[email protected]>; [email protected];
>[email protected]; [email protected]; dri-
>[email protected]; Stephen Boyd <[email protected]>; Ruhl,
>Michael J <[email protected]>; Sean Paul <[email protected]>
>Subject: [PATCH v4 2/2] drm/msm/a6xx: Use the DMA API for GMU memory
>objects
>
>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.
>
>v4: Use dma_alloc_wc()
The patch and the update look good to me.
Reviewed-by: Michael J. Ruhl <[email protected]>
Mike
>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.
>
>Signed-off-by: Jordan Crouse <[email protected]>
>---
>
> drivers/gpu/drm/msm/adreno/a6xx_gmu.c | 113 ++++---------------------------
>---
> drivers/gpu/drm/msm/adreno/a6xx_gmu.h | 6 +-
> 2 files changed, 12 insertions(+), 107 deletions(-)
>
>diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
>b/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
>index 748cd37..dd51dd0 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 +1226,13 @@ 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() */
>+ dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(31));
>
> /* Fow now, don't do anything fancy until we get our feet under us */
> gmu->idle_level = GMU_IDLE_STATE_ACTIVE;
>@@ -1325,11 +1244,6 @@ 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 +1289,6 @@ 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 2af91ed..4af65a3 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;
>--
>2.7.4
>_______________________________________________
>dri-devel mailing list
>[email protected]
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