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Currently every user does their own thing which leads to code duplication. Many users call dma_alloc_coherent() for every call which is terribly unperformant (speed- and size-wise). As all but one calls allocate memory just for the duration of the call, we don't need a lot of memory. A single pool for that purpose is enough. Let's create a genalloc pool dealing out chunks of coherent, page-aligned memory suitable for SCM calls that also provides a function for mapping virtual to physical addresses. Signed-off-by: Bartosz Golaszewski --- drivers/firmware/qcom/Makefile | 2 +- drivers/firmware/qcom/qcom_scm-mem.c | 134 +++++++++++++++++++++++++ drivers/firmware/qcom/qcom_scm.c | 5 + drivers/firmware/qcom/qcom_scm.h | 7 ++ include/linux/firmware/qcom/qcom_scm.h | 7 ++ 5 files changed, 154 insertions(+), 1 deletion(-) create mode 100644 drivers/firmware/qcom/qcom_scm-mem.c diff --git a/drivers/firmware/qcom/Makefile b/drivers/firmware/qcom/Makefile index c9f12ee8224a..b9b117f22e9f 100644 --- a/drivers/firmware/qcom/Makefile +++ b/drivers/firmware/qcom/Makefile @@ -4,6 +4,6 @@ # obj-$(CONFIG_QCOM_SCM) += qcom-scm.o -qcom-scm-objs += qcom_scm.o qcom_scm-smc.o qcom_scm-legacy.o +qcom-scm-objs += qcom_scm.o qcom_scm-smc.o qcom_scm-legacy.o qcom_scm-mem.o obj-$(CONFIG_QCOM_QSEECOM) += qcom_qseecom.o obj-$(CONFIG_QCOM_QSEECOM_UEFISECAPP) += qcom_qseecom_uefisecapp.o diff --git a/drivers/firmware/qcom/qcom_scm-mem.c b/drivers/firmware/qcom/qcom_scm-mem.c new file mode 100644 index 000000000000..eafecbe23770 --- /dev/null +++ b/drivers/firmware/qcom/qcom_scm-mem.c @@ -0,0 +1,134 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (c) 2023 Linaro Ltd. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "qcom_scm.h" + +static size_t qcom_scm_mem_pool_size = SZ_2M; +module_param_named(qcom_scm_mem_pool_size, qcom_scm_mem_pool_size, + ulong, 0400); + +struct { + struct device *dev; + void *vbase; + phys_addr_t pbase; + size_t size; + struct gen_pool *pool; + struct radix_tree_root chunks; + spinlock_t lock; +} qcom_scm_mem; + +struct qcom_scm_mem_chunk { + phys_addr_t paddr; + size_t size; +}; + +void *qcom_scm_mem_alloc(size_t size, gfp_t gfp) +{ + struct qcom_scm_mem_chunk *chunk; + unsigned long vaddr; + int ret; + + if (!size) + return ZERO_SIZE_PTR; + + size = roundup(size, 1 << PAGE_SHIFT); + + chunk = kzalloc(sizeof(*chunk), gfp); + if (!chunk) + return NULL; + + vaddr = gen_pool_alloc(qcom_scm_mem.pool, size); + if (!vaddr) { + kfree(chunk); + return NULL; + } + + chunk->paddr = gen_pool_virt_to_phys(qcom_scm_mem.pool, + (unsigned long)vaddr); + chunk->size = size; + + scoped_guard(spinlock_irqsave, &qcom_scm_mem.lock) { + ret = radix_tree_insert(&qcom_scm_mem.chunks, vaddr, chunk); + if (ret) { + gen_pool_free(qcom_scm_mem.pool, (unsigned long)vaddr, + chunk->size); + kfree(chunk); + return NULL; + } + } + + return (void *)vaddr; +} +EXPORT_SYMBOL_GPL(qcom_scm_mem_alloc); + +void qcom_scm_mem_free(void *vaddr) +{ + struct qcom_scm_mem_chunk *chunk; + + if (!vaddr) + return; + + scoped_guard(spinlock_irqsave, &qcom_scm_mem.lock) + chunk = radix_tree_delete_item(&qcom_scm_mem.chunks, + (unsigned long)vaddr, NULL); + + if (!chunk) { + WARN(1, "Virtual address %p not allocated for SCM", vaddr); + return; + } + + gen_pool_free(qcom_scm_mem.pool, (unsigned long)vaddr, chunk->size); + kfree(chunk); +} +EXPORT_SYMBOL_GPL(qcom_scm_mem_free); + +phys_addr_t qcom_scm_mem_to_phys(void *vaddr) +{ + struct qcom_scm_mem_chunk *chunk; + + guard(spinlock_irqsave)(&qcom_scm_mem.lock); + + chunk = radix_tree_lookup(&qcom_scm_mem.chunks, (unsigned long)vaddr); + if (!chunk) + return 0; + + return chunk->paddr; +} + +int qcom_scm_mem_enable(struct device *dev) +{ + INIT_RADIX_TREE(&qcom_scm_mem.chunks, GFP_ATOMIC); + spin_lock_init(&qcom_scm_mem.lock); + qcom_scm_mem.dev = dev; + qcom_scm_mem.size = qcom_scm_mem_pool_size; + + qcom_scm_mem.vbase = dmam_alloc_coherent(dev, qcom_scm_mem.size, + &qcom_scm_mem.pbase, + GFP_KERNEL); + if (!qcom_scm_mem.vbase) + return -ENOMEM; + + qcom_scm_mem.pool = devm_gen_pool_create(dev, PAGE_SHIFT, -1, + "qcom-scm-mem"); + if (!qcom_scm_mem.pool) + return -ENOMEM; + + gen_pool_set_algo(qcom_scm_mem.pool, gen_pool_best_fit, NULL); + + return gen_pool_add_virt(qcom_scm_mem.pool, + (unsigned long)qcom_scm_mem.vbase, + qcom_scm_mem.pbase, qcom_scm_mem.size, -1); +} diff --git a/drivers/firmware/qcom/qcom_scm.c b/drivers/firmware/qcom/qcom_scm.c index c2c7fafef34b..258aa0782754 100644 --- a/drivers/firmware/qcom/qcom_scm.c +++ b/drivers/firmware/qcom/qcom_scm.c @@ -1880,6 +1880,11 @@ static int qcom_scm_probe(struct platform_device *pdev) if (of_property_read_bool(pdev->dev.of_node, "qcom,sdi-enabled")) qcom_scm_disable_sdi(); + ret = qcom_scm_mem_enable(scm->dev); + if (ret) + return dev_err_probe(scm->dev, ret, + "Failed to enable SCM memory\n"); + /* * Initialize the QSEECOM interface. * diff --git a/drivers/firmware/qcom/qcom_scm.h b/drivers/firmware/qcom/qcom_scm.h index 7b68fa820495..8c97e3906afa 100644 --- a/drivers/firmware/qcom/qcom_scm.h +++ b/drivers/firmware/qcom/qcom_scm.h @@ -4,6 +4,10 @@ #ifndef __QCOM_SCM_INT_H #define __QCOM_SCM_INT_H +#include + +struct device; + enum qcom_scm_convention { SMC_CONVENTION_UNKNOWN, SMC_CONVENTION_LEGACY, @@ -165,4 +169,7 @@ static inline int qcom_scm_remap_error(int err) return -EINVAL; } +int qcom_scm_mem_enable(struct device *dev); +phys_addr_t qcom_scm_mem_to_phys(void *vaddr); + #endif diff --git a/include/linux/firmware/qcom/qcom_scm.h b/include/linux/firmware/qcom/qcom_scm.h index ccaf28846054..291ef8fd21b0 100644 --- a/include/linux/firmware/qcom/qcom_scm.h +++ b/include/linux/firmware/qcom/qcom_scm.h @@ -5,7 +5,9 @@ #ifndef __QCOM_SCM_H #define __QCOM_SCM_H +#include #include +#include #include #include @@ -61,6 +63,11 @@ enum qcom_scm_ice_cipher { bool qcom_scm_is_available(void); +void *qcom_scm_mem_alloc(size_t size, gfp_t gfp); +void qcom_scm_mem_free(void *vaddr); + +DEFINE_FREE(qcom_scm_mem, void *, if (_T) qcom_scm_mem_free(_T)); + int qcom_scm_set_cold_boot_addr(void *entry); int qcom_scm_set_warm_boot_addr(void *entry); void qcom_scm_cpu_power_down(u32 flags);