From: Christoph Hellwig hch@lst.de
[ Upstream commit 459b1f86f1cba7de813fbc335df476c111feec22 ]
As far as the device is concerned the dma address is the physical address. There is no need to convert it to a physical address, especially not using dma-direct internals that are not available to drivers and which will interact badly with IOMMUs. Last but not least the commit introducing it claimed to just fix a type issue, but actually changed behavior.
Fixes: 6e37ccf78a532 ("firmware: qcom_scm: Use proper types for dma mappings") Reviewed-by: Bjorn Andersson bjorn.andersson@linaro.org Signed-off-by: Christoph Hellwig hch@lst.de Link: https://lore.kernel.org/r/20200414123136.441454-1-hch@lst.de Signed-off-by: Bjorn Andersson bjorn.andersson@linaro.org Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Yang Yingliang yangyingliang@huawei.com --- drivers/firmware/qcom_scm.c | 9 +++------ 1 file changed, 3 insertions(+), 6 deletions(-)
diff --git a/drivers/firmware/qcom_scm.c b/drivers/firmware/qcom_scm.c index 98c987188835..513908a0c262 100644 --- a/drivers/firmware/qcom_scm.c +++ b/drivers/firmware/qcom_scm.c @@ -18,7 +18,6 @@ #include <linux/init.h> #include <linux/cpumask.h> #include <linux/export.h> -#include <linux/dma-direct.h> #include <linux/dma-mapping.h> #include <linux/module.h> #include <linux/types.h> @@ -449,8 +448,7 @@ int qcom_scm_assign_mem(phys_addr_t mem_addr, size_t mem_sz, struct qcom_scm_mem_map_info *mem_to_map; phys_addr_t mem_to_map_phys; phys_addr_t dest_phys; - phys_addr_t ptr_phys; - dma_addr_t ptr_dma; + dma_addr_t ptr_phys; size_t mem_to_map_sz; size_t dest_sz; size_t src_sz; @@ -468,10 +466,9 @@ int qcom_scm_assign_mem(phys_addr_t mem_addr, size_t mem_sz, ptr_sz = ALIGN(src_sz, SZ_64) + ALIGN(mem_to_map_sz, SZ_64) + ALIGN(dest_sz, SZ_64);
- ptr = dma_alloc_coherent(__scm->dev, ptr_sz, &ptr_dma, GFP_KERNEL); + ptr = dma_alloc_coherent(__scm->dev, ptr_sz, &ptr_phys, GFP_KERNEL); if (!ptr) return -ENOMEM; - ptr_phys = dma_to_phys(__scm->dev, ptr_dma);
/* Fill source vmid detail */ src = ptr; @@ -501,7 +498,7 @@ int qcom_scm_assign_mem(phys_addr_t mem_addr, size_t mem_sz,
ret = __qcom_scm_assign_mem(__scm->dev, mem_to_map_phys, mem_to_map_sz, ptr_phys, src_sz, dest_phys, dest_sz); - dma_free_coherent(__scm->dev, ptr_sz, ptr, ptr_dma); + dma_free_coherent(__scm->dev, ptr_sz, ptr, ptr_phys); if (ret) { dev_err(__scm->dev, "Assign memory protection call failed %d.\n", ret);