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Date: Sun, 23 Aug 2020 16:05:46 -0700
From: Guenter Roeck <linux@...ck-us.net>
To: Jordan Crouse <jcrouse@...eaurora.org>
Cc: linux-arm-msm@...r.kernel.org, Sean Paul <sean@...rly.run>,
Sai Prakash Ranjan <saiprakash.ranjan@...eaurora.org>,
Will Deacon <will@...nel.org>, David Airlie <airlied@...ux.ie>,
freedreno@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
Bjorn Andersson <bjorn.andersson@...aro.org>,
iommu@...ts.linux-foundation.org,
Robin Murphy <robin.murphy@....com>,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH v12 09/13] drm/msm: Add support to create a local
pagetable
On Mon, Aug 10, 2020 at 04:26:53PM -0600, Jordan Crouse wrote:
> Add support to create a io-pgtable for use by targets that support
> per-instance pagetables. In order to support per-instance pagetables the
> GPU SMMU device needs to have the qcom,adreno-smmu compatible string and
> split pagetables enabled.
>
> Signed-off-by: Jordan Crouse <jcrouse@...eaurora.org>
This patch adds a hard dependency on IOMMU_IO_PGTABLE (for
alloc_io_pgtable_ops and free_io_pgtable_ops).
Guenter
> ---
>
> drivers/gpu/drm/msm/msm_gpummu.c | 2 +-
> drivers/gpu/drm/msm/msm_iommu.c | 190 ++++++++++++++++++++++++++++++-
> drivers/gpu/drm/msm/msm_mmu.h | 16 ++-
> 3 files changed, 205 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpu/drm/msm/msm_gpummu.c b/drivers/gpu/drm/msm/msm_gpummu.c
> index 310a31b05faa..aab121f4beb7 100644
> --- a/drivers/gpu/drm/msm/msm_gpummu.c
> +++ b/drivers/gpu/drm/msm/msm_gpummu.c
> @@ -102,7 +102,7 @@ struct msm_mmu *msm_gpummu_new(struct device *dev, struct msm_gpu *gpu)
> }
>
> gpummu->gpu = gpu;
> - msm_mmu_init(&gpummu->base, dev, &funcs);
> + msm_mmu_init(&gpummu->base, dev, &funcs, MSM_MMU_GPUMMU);
>
> return &gpummu->base;
> }
> diff --git a/drivers/gpu/drm/msm/msm_iommu.c b/drivers/gpu/drm/msm/msm_iommu.c
> index 1b6635504069..bc04dda8a198 100644
> --- a/drivers/gpu/drm/msm/msm_iommu.c
> +++ b/drivers/gpu/drm/msm/msm_iommu.c
> @@ -4,15 +4,201 @@
> * Author: Rob Clark <robdclark@...il.com>
> */
>
> +#include <linux/io-pgtable.h>
> #include "msm_drv.h"
> #include "msm_mmu.h"
>
> struct msm_iommu {
> struct msm_mmu base;
> struct iommu_domain *domain;
> + atomic_t pagetables;
> };
> +
> #define to_msm_iommu(x) container_of(x, struct msm_iommu, base)
>
> +struct msm_iommu_pagetable {
> + struct msm_mmu base;
> + struct msm_mmu *parent;
> + struct io_pgtable_ops *pgtbl_ops;
> + phys_addr_t ttbr;
> + u32 asid;
> +};
> +static struct msm_iommu_pagetable *to_pagetable(struct msm_mmu *mmu)
> +{
> + return container_of(mmu, struct msm_iommu_pagetable, base);
> +}
> +
> +static int msm_iommu_pagetable_unmap(struct msm_mmu *mmu, u64 iova,
> + size_t size)
> +{
> + struct msm_iommu_pagetable *pagetable = to_pagetable(mmu);
> + struct io_pgtable_ops *ops = pagetable->pgtbl_ops;
> + size_t unmapped = 0;
> +
> + /* Unmap the block one page at a time */
> + while (size) {
> + unmapped += ops->unmap(ops, iova, 4096, NULL);
> + iova += 4096;
> + size -= 4096;
> + }
> +
> + iommu_flush_tlb_all(to_msm_iommu(pagetable->parent)->domain);
> +
> + return (unmapped == size) ? 0 : -EINVAL;
> +}
> +
> +static int msm_iommu_pagetable_map(struct msm_mmu *mmu, u64 iova,
> + struct sg_table *sgt, size_t len, int prot)
> +{
> + struct msm_iommu_pagetable *pagetable = to_pagetable(mmu);
> + struct io_pgtable_ops *ops = pagetable->pgtbl_ops;
> + struct scatterlist *sg;
> + size_t mapped = 0;
> + u64 addr = iova;
> + unsigned int i;
> +
> + for_each_sg(sgt->sgl, sg, sgt->nents, i) {
> + size_t size = sg->length;
> + phys_addr_t phys = sg_phys(sg);
> +
> + /* Map the block one page at a time */
> + while (size) {
> + if (ops->map(ops, addr, phys, 4096, prot, GFP_KERNEL)) {
> + msm_iommu_pagetable_unmap(mmu, iova, mapped);
> + return -EINVAL;
> + }
> +
> + phys += 4096;
> + addr += 4096;
> + size -= 4096;
> + mapped += 4096;
> + }
> + }
> +
> + return 0;
> +}
> +
> +static void msm_iommu_pagetable_destroy(struct msm_mmu *mmu)
> +{
> + struct msm_iommu_pagetable *pagetable = to_pagetable(mmu);
> + struct msm_iommu *iommu = to_msm_iommu(pagetable->parent);
> +
> + /*
> + * If this is the last attached pagetable for the parent,
> + * disable TTBR0 in the arm-smmu driver
> + */
> + if (atomic_dec_return(&iommu->pagetables) == 0)
> + iommu_domain_set_attr(iommu->domain,
> + DOMAIN_ATTR_PGTABLE_CFG, NULL);
> +
> + free_io_pgtable_ops(pagetable->pgtbl_ops);
> + kfree(pagetable);
> +}
> +
> +int msm_iommu_pagetable_params(struct msm_mmu *mmu,
> + phys_addr_t *ttbr, int *asid)
> +{
> + struct msm_iommu_pagetable *pagetable;
> +
> + if (mmu->type != MSM_MMU_IOMMU_PAGETABLE)
> + return -EINVAL;
> +
> + pagetable = to_pagetable(mmu);
> +
> + if (ttbr)
> + *ttbr = pagetable->ttbr;
> +
> + if (asid)
> + *asid = pagetable->asid;
> +
> + return 0;
> +}
> +
> +static const struct msm_mmu_funcs pagetable_funcs = {
> + .map = msm_iommu_pagetable_map,
> + .unmap = msm_iommu_pagetable_unmap,
> + .destroy = msm_iommu_pagetable_destroy,
> +};
> +
> +static void msm_iommu_tlb_flush_all(void *cookie)
> +{
> +}
> +
> +static void msm_iommu_tlb_flush_walk(unsigned long iova, size_t size,
> + size_t granule, void *cookie)
> +{
> +}
> +
> +static void msm_iommu_tlb_add_page(struct iommu_iotlb_gather *gather,
> + unsigned long iova, size_t granule, void *cookie)
> +{
> +}
> +
> +static const struct iommu_flush_ops null_tlb_ops = {
> + .tlb_flush_all = msm_iommu_tlb_flush_all,
> + .tlb_flush_walk = msm_iommu_tlb_flush_walk,
> + .tlb_flush_leaf = msm_iommu_tlb_flush_walk,
> + .tlb_add_page = msm_iommu_tlb_add_page,
> +};
> +
> +struct msm_mmu *msm_iommu_pagetable_create(struct msm_mmu *parent)
> +{
> + struct msm_iommu *iommu = to_msm_iommu(parent);
> + static int next_asid = 16;
> + struct msm_iommu_pagetable *pagetable;
> + struct io_pgtable_cfg cfg;
> + int ret;
> +
> + /* Get the pagetable configuration from the domain */
> + ret = iommu_domain_get_attr(iommu->domain,
> + DOMAIN_ATTR_PGTABLE_CFG, &cfg);
> + if (ret)
> + return ERR_PTR(ret);
> +
> + pagetable = kzalloc(sizeof(*pagetable), GFP_KERNEL);
> + if (!pagetable)
> + return ERR_PTR(-ENOMEM);
> +
> + msm_mmu_init(&pagetable->base, parent->dev, &pagetable_funcs,
> + MSM_MMU_IOMMU_PAGETABLE);
> +
> + /* The incoming cfg will have the TTBR1 quirk enabled */
> + cfg.quirks &= ~IO_PGTABLE_QUIRK_ARM_TTBR1;
> + cfg.tlb = &null_tlb_ops;
> +
> + pagetable->pgtbl_ops = alloc_io_pgtable_ops(ARM_64_LPAE_S1,
> + &cfg, iommu->domain);
> +
> + if (!pagetable->pgtbl_ops) {
> + kfree(pagetable);
> + return ERR_PTR(-ENOMEM);
> + }
> +
> + /*
> + * If this is the first pagetable that we've allocated, send it back to
> + * the arm-smmu driver as a trigger to set up TTBR0
> + */
> + if (atomic_inc_return(&iommu->pagetables) == 1) {
> + ret = iommu_domain_set_attr(iommu->domain,
> + DOMAIN_ATTR_PGTABLE_CFG, &cfg);
> + if (ret) {
> + free_io_pgtable_ops(pagetable->pgtbl_ops);
> + kfree(pagetable);
> + return ERR_PTR(ret);
> + }
> + }
> +
> + /* Needed later for TLB flush */
> + pagetable->parent = parent;
> + pagetable->ttbr = cfg.arm_lpae_s1_cfg.ttbr;
> +
> + pagetable->asid = next_asid;
> + next_asid = (next_asid + 1) % 255;
> + next_asid = min(16, next_asid);
> +
> + return &pagetable->base;
> +}
> +
> static int msm_fault_handler(struct iommu_domain *domain, struct device *dev,
> unsigned long iova, int flags, void *arg)
> {
> @@ -85,9 +271,11 @@ struct msm_mmu *msm_iommu_new(struct device *dev, struct iommu_domain *domain)
> return ERR_PTR(-ENOMEM);
>
> iommu->domain = domain;
> - msm_mmu_init(&iommu->base, dev, &funcs);
> + msm_mmu_init(&iommu->base, dev, &funcs, MSM_MMU_IOMMU);
> iommu_set_fault_handler(domain, msm_fault_handler, iommu);
>
> + atomic_set(&iommu->pagetables, 0);
> +
> ret = iommu_attach_device(iommu->domain, dev);
> if (ret) {
> kfree(iommu);
> diff --git a/drivers/gpu/drm/msm/msm_mmu.h b/drivers/gpu/drm/msm/msm_mmu.h
> index 3a534ee59bf6..61ade89d9e48 100644
> --- a/drivers/gpu/drm/msm/msm_mmu.h
> +++ b/drivers/gpu/drm/msm/msm_mmu.h
> @@ -17,18 +17,26 @@ struct msm_mmu_funcs {
> void (*destroy)(struct msm_mmu *mmu);
> };
>
> +enum msm_mmu_type {
> + MSM_MMU_GPUMMU,
> + MSM_MMU_IOMMU,
> + MSM_MMU_IOMMU_PAGETABLE,
> +};
> +
> struct msm_mmu {
> const struct msm_mmu_funcs *funcs;
> struct device *dev;
> int (*handler)(void *arg, unsigned long iova, int flags);
> void *arg;
> + enum msm_mmu_type type;
> };
>
> static inline void msm_mmu_init(struct msm_mmu *mmu, struct device *dev,
> - const struct msm_mmu_funcs *funcs)
> + const struct msm_mmu_funcs *funcs, enum msm_mmu_type type)
> {
> mmu->dev = dev;
> mmu->funcs = funcs;
> + mmu->type = type;
> }
>
> struct msm_mmu *msm_iommu_new(struct device *dev, struct iommu_domain *domain);
> @@ -41,7 +49,13 @@ static inline void msm_mmu_set_fault_handler(struct msm_mmu *mmu, void *arg,
> mmu->handler = handler;
> }
>
> +struct msm_mmu *msm_iommu_pagetable_create(struct msm_mmu *parent);
> +
> void msm_gpummu_params(struct msm_mmu *mmu, dma_addr_t *pt_base,
> dma_addr_t *tran_error);
>
> +
> +int msm_iommu_pagetable_params(struct msm_mmu *mmu, phys_addr_t *ttbr,
> + int *asid);
> +
> #endif /* __MSM_MMU_H__ */
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