From: Jordan Crouse jcrouse@codeaurora.org
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@codeaurora.org Signed-off-by: Rob Clark robdclark@chromium.org --- drivers/gpu/drm/msm/Kconfig | 1 + drivers/gpu/drm/msm/msm_gpummu.c | 2 +- drivers/gpu/drm/msm/msm_iommu.c | 199 ++++++++++++++++++++++++++++++- drivers/gpu/drm/msm/msm_mmu.h | 16 ++- 4 files changed, 215 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/msm/Kconfig b/drivers/gpu/drm/msm/Kconfig index 6deaa7d01654..5102a58830b9 100644 --- a/drivers/gpu/drm/msm/Kconfig +++ b/drivers/gpu/drm/msm/Kconfig @@ -8,6 +8,7 @@ config DRM_MSM depends on MMU depends on INTERCONNECT || !INTERCONNECT depends on QCOM_OCMEM || QCOM_OCMEM=n + select IOMMU_IO_PGTABLE select QCOM_MDT_LOADER if ARCH_QCOM select REGULATOR select DRM_KMS_HELPER 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..697cc0a059d6 100644 --- a/drivers/gpu/drm/msm/msm_iommu.c +++ b/drivers/gpu/drm/msm/msm_iommu.c @@ -4,15 +4,210 @@ * Author: Rob Clark robdclark@gmail.com */
+#include <linux/adreno-smmu-priv.h> +#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); + struct adreno_smmu_priv *adreno_smmu = + dev_get_drvdata(pagetable->parent->dev); + + /* + * If this is the last attached pagetable for the parent, + * disable TTBR0 in the arm-smmu driver + */ + if (atomic_dec_return(&iommu->pagetables) == 0) + adreno_smmu->set_ttbr0_cfg(adreno_smmu->cookie, 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 adreno_smmu_priv *adreno_smmu = dev_get_drvdata(parent->dev); + struct msm_iommu *iommu = to_msm_iommu(parent); + struct msm_iommu_pagetable *pagetable; + const struct io_pgtable_cfg *ttbr1_cfg = NULL; + struct io_pgtable_cfg ttbr0_cfg; + int ret; + + /* Get the pagetable configuration from the domain */ + if (adreno_smmu->cookie) + ttbr1_cfg = adreno_smmu->get_ttbr1_cfg(adreno_smmu->cookie); + if (!ttbr1_cfg) + return ERR_PTR(-ENODEV); + + 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); + + /* Clone the TTBR1 cfg as starting point for TTBR0 cfg: */ + ttbr0_cfg = *ttbr1_cfg; + + /* The incoming cfg will have the TTBR1 quirk enabled */ + ttbr0_cfg.quirks &= ~IO_PGTABLE_QUIRK_ARM_TTBR1; + ttbr0_cfg.tlb = &null_tlb_ops; + + pagetable->pgtbl_ops = alloc_io_pgtable_ops(ARM_64_LPAE_S1, + &ttbr0_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 = adreno_smmu->set_ttbr0_cfg(adreno_smmu->cookie, &ttbr0_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 = ttbr0_cfg.arm_lpae_s1_cfg.ttbr; + + /* + * TODO we would like each set of page tables to have a unique ASID + * to optimize TLB invalidation. But iommu_flush_tlb_all() will + * end up flushing the ASID used for TTBR1 pagetables, which is not + * what we want. So for now just use the same ASID as TTBR1. + */ + pagetable->asid = 0; + + return &pagetable->base; +} + static int msm_fault_handler(struct iommu_domain *domain, struct device *dev, unsigned long iova, int flags, void *arg) { @@ -85,9 +280,11 @@ 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__ */