Re: [PATCH v2 3/9] drm/msm/a6xx: use msm_gem for GMU memory objects

From: Jordan Crouse
Date: Thu Apr 23 2020 - 11:34:44 EST

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In reply to: Jonathan Marek: "[PATCH v2 3/9] drm/msm/a6xx: use msm_gem for GMU memory objects"
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On Tue, Apr 21, 2020 at 07:41:21PM -0400, Jonathan Marek wrote:
> This gives more fine-grained control over how memory is allocated over the
> DMA api. In particular, it allows using an address range or pinning to
> a fixed address.

Reviewed-by: Jordan Crouse <jcrouse@xxxxxxxxxxxxxx>

> Signed-off-by: Jonathan Marek <jonathan@xxxxxxxx>
> ---
> drivers/gpu/drm/msm/adreno/a6xx_gmu.c | 115 ++++++++++++++++++--------
> drivers/gpu/drm/msm/adreno/a6xx_gmu.h | 9 +-
> drivers/gpu/drm/msm/adreno/a6xx_hfi.c | 6 +-
> 3 files changed, 88 insertions(+), 42 deletions(-)
>
> diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gmu.c b/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
> index c4e71abbdd53..c9fd0470a321 100644
> --- a/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
> +++ b/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
> @@ -2,14 +2,16 @@
> /* 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>
> #include <soc/qcom/cmd-db.h>
> +#include <drm/drm_gem.h>
>
> #include "a6xx_gpu.h"
> #include "a6xx_gmu.xml.h"
> +#include "msm_gem.h"
> +#include "msm_mmu.h"
>
> static void a6xx_gmu_fault(struct a6xx_gmu *gmu)
> {
> @@ -620,7 +622,7 @@ static int a6xx_gmu_fw_start(struct a6xx_gmu *gmu, unsigned int state)
> gmu_write(gmu, REG_A6XX_GMU_CM3_BOOT_CONFIG, 0x02);
>
> /* Write the iova of the HFI table */
> - gmu_write(gmu, REG_A6XX_GMU_HFI_QTBL_ADDR, gmu->hfi->iova);
> + gmu_write(gmu, REG_A6XX_GMU_HFI_QTBL_ADDR, gmu->hfi.iova);
> gmu_write(gmu, REG_A6XX_GMU_HFI_QTBL_INFO, 1);
>
> gmu_write(gmu, REG_A6XX_GMU_AHB_FENCE_RANGE_0,
> @@ -919,34 +921,77 @@ int a6xx_gmu_stop(struct a6xx_gpu *a6xx_gpu)
> return 0;
> }
>
> -static void a6xx_gmu_memory_free(struct a6xx_gmu *gmu, struct a6xx_gmu_bo *bo)
> +static void a6xx_gmu_memory_free(struct a6xx_gmu *gmu)
> {
> - if (IS_ERR_OR_NULL(bo))
> - return;
> + msm_gem_kernel_put(gmu->hfi.obj, gmu->aspace, false);
> + msm_gem_kernel_put(gmu->debug.obj, gmu->aspace, false);
> +
> + gmu->aspace->mmu->funcs->detach(gmu->aspace->mmu);
> + msm_gem_address_space_put(gmu->aspace);
> +}
> +
> +static int a6xx_gmu_memory_alloc(struct a6xx_gmu *gmu, struct a6xx_gmu_bo *bo,
> + size_t size, u64 iova)
> +{
> + struct a6xx_gpu *a6xx_gpu = container_of(gmu, struct a6xx_gpu, gmu);
> + struct drm_device *dev = a6xx_gpu->base.base.dev;
> + uint32_t flags = MSM_BO_WC;
> + u64 range_start, range_end;
> + int ret;
> +
> + size = PAGE_ALIGN(size);
> + if (!iova) {
> + /* no fixed address - use GMU's uncached range */
> + range_start = 0x60000000;
> + range_end = 0x80000000;
> + } else {
> + /* range for fixed address */
> + range_start = iova;
> + range_end = iova + size;
> + }
> +
> + bo->obj = msm_gem_new(dev, size, flags);
> + if (IS_ERR(bo->obj))
> + return PTR_ERR(bo->obj);
>
> - dma_free_wc(gmu->dev, bo->size, bo->virt, bo->iova);
> - kfree(bo);
> + ret = msm_gem_get_and_pin_iova_range(bo->obj, gmu->aspace, &bo->iova,
> + range_start >> PAGE_SHIFT, range_end >> PAGE_SHIFT);
> + if (ret) {
> + drm_gem_object_put(bo->obj);
> + return ret;
> + }
> +
> + bo->virt = msm_gem_get_vaddr(bo->obj);
> + bo->size = size;
> +
> + return 0;
> }
>
> -static struct a6xx_gmu_bo *a6xx_gmu_memory_alloc(struct a6xx_gmu *gmu,
> - size_t size)
> +static int a6xx_gmu_memory_probe(struct a6xx_gmu *gmu)
> {
> - struct a6xx_gmu_bo *bo;
> + struct iommu_domain *domain;
> + int ret;
>
> - bo = kzalloc(sizeof(*bo), GFP_KERNEL);
> - if (!bo)
> - return ERR_PTR(-ENOMEM);
> + domain = iommu_domain_alloc(&platform_bus_type);
> + if (!domain)
> + return -ENODEV;
>
> - bo->size = PAGE_ALIGN(size);
> + domain->geometry.aperture_start = 0x00000000;
> + domain->geometry.aperture_end = 0x7fffffff;
>
> - bo->virt = dma_alloc_wc(gmu->dev, bo->size, &bo->iova, GFP_KERNEL);
> + gmu->aspace = msm_gem_address_space_create(gmu->dev, domain, "gmu");
> + if (IS_ERR(gmu->aspace)) {
> + iommu_domain_free(domain);
> + return PTR_ERR(gmu->aspace);
> + }
>
> - if (!bo->virt) {
> - kfree(bo);
> - return ERR_PTR(-ENOMEM);
> + ret = gmu->aspace->mmu->funcs->attach(gmu->aspace->mmu);
> + if (ret) {
> + msm_gem_address_space_put(gmu->aspace);
> + return ret;
> }
>
> - return bo;
> + return 0;
> }
>
> /* Return the 'arc-level' for the given frequency */
> @@ -1204,7 +1249,7 @@ void a6xx_gmu_remove(struct a6xx_gpu *a6xx_gpu)
> iounmap(gmu->mmio);
> gmu->mmio = NULL;
>
> - a6xx_gmu_memory_free(gmu, gmu->hfi);
> + a6xx_gmu_memory_free(gmu);
>
> free_irq(gmu->gmu_irq, gmu);
> free_irq(gmu->hfi_irq, gmu);
> @@ -1226,15 +1271,7 @@ int a6xx_gmu_init(struct a6xx_gpu *a6xx_gpu, struct device_node *node)
>
> gmu->dev = &pdev->dev;
>
> - /* 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;
> + of_dma_configure(gmu->dev, node, true);
>
> /* Fow now, don't do anything fancy until we get our feet under us */
> gmu->idle_level = GMU_IDLE_STATE_ACTIVE;
> @@ -1246,20 +1283,26 @@ int a6xx_gmu_init(struct a6xx_gpu *a6xx_gpu, struct device_node *node)
> if (ret)
> goto err_put_device;
>
> + 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))
> + ret = a6xx_gmu_memory_alloc(gmu, &gmu->hfi, SZ_16K, 0);
> + if (ret)
> goto err_memory;
>
> /* Allocate memory for the GMU debug region */
> - gmu->debug = a6xx_gmu_memory_alloc(gmu, SZ_16K);
> - if (IS_ERR(gmu->debug))
> + ret = a6xx_gmu_memory_alloc(gmu, &gmu->debug, SZ_16K, 0);
> + if (ret)
> goto err_memory;
>
> /* Map the GMU registers */
> gmu->mmio = a6xx_gmu_get_mmio(pdev, "gmu");
> - if (IS_ERR(gmu->mmio))
> + if (IS_ERR(gmu->mmio)) {
> + ret = PTR_ERR(gmu->mmio);
> goto err_memory;
> + }
>
> /* Get the HFI and GMU interrupts */
> gmu->hfi_irq = a6xx_gmu_get_irq(gmu, pdev, "hfi", a6xx_hfi_irq);
> @@ -1288,11 +1331,11 @@ int a6xx_gmu_init(struct a6xx_gpu *a6xx_gpu, struct device_node *node)
> iounmap(gmu->mmio);
> free_irq(gmu->gmu_irq, gmu);
> free_irq(gmu->hfi_irq, gmu);
> -err_memory:
> - a6xx_gmu_memory_free(gmu, gmu->hfi);
>
> ret = -ENODEV;
>
> +err_memory:
> + a6xx_gmu_memory_free(gmu);
> err_put_device:
> /* Drop reference taken in of_find_device_by_node */
> put_device(gmu->dev);
> diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gmu.h b/drivers/gpu/drm/msm/adreno/a6xx_gmu.h
> index 4af65a36d5ca..cd66a5e1d7e9 100644
> --- a/drivers/gpu/drm/msm/adreno/a6xx_gmu.h
> +++ b/drivers/gpu/drm/msm/adreno/a6xx_gmu.h
> @@ -10,9 +10,10 @@
> #include "a6xx_hfi.h"
>
> struct a6xx_gmu_bo {
> + struct drm_gem_object *obj;
> void *virt;
> size_t size;
> - dma_addr_t iova;
> + u64 iova;
> };
>
> /*
> @@ -43,6 +44,8 @@ struct a6xx_gmu_bo {
> struct a6xx_gmu {
> struct device *dev;
>
> + struct msm_gem_address_space *aspace;
> +
> void * __iomem mmio;
>
> int hfi_irq;
> @@ -52,8 +55,8 @@ struct a6xx_gmu {
>
> int idle_level;
>
> - struct a6xx_gmu_bo *hfi;
> - struct a6xx_gmu_bo *debug;
> + struct a6xx_gmu_bo hfi;
> + struct a6xx_gmu_bo debug;
>
> int nr_clocks;
> struct clk_bulk_data *clocks;
> diff --git a/drivers/gpu/drm/msm/adreno/a6xx_hfi.c b/drivers/gpu/drm/msm/adreno/a6xx_hfi.c
> index e450e0b97211..b90343d4caf0 100644
> --- a/drivers/gpu/drm/msm/adreno/a6xx_hfi.c
> +++ b/drivers/gpu/drm/msm/adreno/a6xx_hfi.c
> @@ -176,8 +176,8 @@ static int a6xx_hfi_send_gmu_init(struct a6xx_gmu *gmu, int boot_state)
> {
> struct a6xx_hfi_msg_gmu_init_cmd msg = { 0 };
>
> - msg.dbg_buffer_addr = (u32) gmu->debug->iova;
> - msg.dbg_buffer_size = (u32) gmu->debug->size;
> + msg.dbg_buffer_addr = (u32) gmu->debug.iova;
> + msg.dbg_buffer_size = (u32) gmu->debug.size;
> msg.boot_state = boot_state;
>
> return a6xx_hfi_send_msg(gmu, HFI_H2F_MSG_INIT, &msg, sizeof(msg),
> @@ -385,7 +385,7 @@ static void a6xx_hfi_queue_init(struct a6xx_hfi_queue *queue,
>
> void a6xx_hfi_init(struct a6xx_gmu *gmu)
> {
> - struct a6xx_gmu_bo *hfi = gmu->hfi;
> + struct a6xx_gmu_bo *hfi = &gmu->hfi;
> struct a6xx_hfi_queue_table_header *table = hfi->virt;
> struct a6xx_hfi_queue_header *headers = hfi->virt + sizeof(*table);
> u64 offset;
> --
> 2.26.1
>

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Next message: Kiran Gunda: "[PATCH V6 3/4] backlight: qcom-wled: Add WLED5 bindings"
Previous message: Kiran Gunda: "[PATCH V6 2/4] backlight: qcom-wled: Add callback functions"
In reply to: Jonathan Marek: "[PATCH v2 3/9] drm/msm/a6xx: use msm_gem for GMU memory objects"
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