Messages in this thread | | | From | Zhao Qiang <> | Subject | RE: [PATCH v9 3/5] qe_common: add qe_muram_ functions to manage muram | Date | Fri, 18 Sep 2015 02:35:48 +0000 |
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On Mon, 2015-09-18 at 04:28 +0800, Wood Scott-B07421 wrote: > -----Original Message----- > From: Wood Scott-B07421 > Sent: Friday, September 18, 2015 4:28 AM > To: Zhao Qiang-B45475 > Cc: linux-kernel@vger.kernel.org; linuxppc-dev@lists.ozlabs.org; > lauraa@codeaurora.org; Xie Xiaobo-R63061; benh@kernel.crashing.org; Li > Yang-Leo-R58472; paulus@samba.org > Subject: Re: [PATCH v9 3/5] qe_common: add qe_muram_ functions to manage > muram > > On Mon, 2015-09-14 at 09:38 +0800, Zhao Qiang wrote: > > diff --git a/arch/powerpc/sysdev/qe_lib/qe_common.c > > b/arch/powerpc/sysdev/qe_lib/qe_common.c > > new file mode 100644 > > index 0000000..1213458 > > --- /dev/null > > +++ b/arch/powerpc/sysdev/qe_lib/qe_common.c > > @@ -0,0 +1,242 @@ > > +/* > > + * Freescale QE common code > > + * > > + * Author: Zhao Qiang <qiang.zhao@freescale.com> > > + * > > + * Copyright 2015 Freescale Semiconductor, Inc. > > + * > > + * This program is free software; you can redistribute it and/or > > +modify > > + * it under the terms of the GNU General Public License as published > > +by > > + * the Free Software Foundation; either version 2 of the License, or > > + * (at your option) any later version. > > + */ > > + > > +#include <linux/genalloc.h> > > +#include <linux/list.h> > > +#include <linux/init.h> > > +#include <linux/of_device.h> > > +#include <linux/spinlock.h> > > +#include <linux/export.h> > > +#include <linux/of.h> > > +#include <linux/of_address.h> > > +#include <linux/slab.h> > > + > > +#include <linux/io.h> > > +#include <asm/qe.h> > > + > > +static struct gen_pool *muram_pool; > > +static struct genpool_data_align muram_pool_data; static struct > > +genpool_data_fixed muram_pool_data_fixed; static spinlock_t > > +qe_muram_lock; static u8 __iomem *muram_vbase; static phys_addr_t > > +muram_pbase; > > + > > +struct muram_block { > > + struct list_head head; > > + unsigned long start; > > + int size; > > +}; > > + > > +static LIST_HEAD(muram_block_list); > > + > > +/* max address size we deal with */ > > +#define OF_MAX_ADDR_CELLS 4 > > +#define GENPOOL_OFFSET 4096 > > + > > +int qe_muram_init(void) > > +{ > > + struct device_node *np; > > + struct resource r; > > + u32 zero[OF_MAX_ADDR_CELLS] = {}; > > + resource_size_t max = 0; > > + int i = 0; > > + int ret = 0; > > + > > + if (muram_pbase) > > + return 0; > > + > > + np = of_find_compatible_node(NULL, NULL, "fsl,qe-muram-data"); > > + if (!np) { > > + /* try legacy bindings */ > > + np = of_find_node_by_name(NULL, "data-only"); > > + if (!np) { > > + pr_err("Cannot find CPM muram data node"); > > + ret = -ENODEV; > > + goto out; > > + } > > + } > > + > > + muram_pool = gen_pool_create(1, -1); > > + muram_pbase = of_translate_address(np, zero); > > + if (muram_pbase == (phys_addr_t)OF_BAD_ADDR) { > > + pr_err("Cannot translate zero through CPM muram node"); > > + ret = -ENODEV; > > + goto err; > > + } > > + > > + while (of_address_to_resource(np, i++, &r) == 0) { > > + if (r.end > max) > > + max = r.end; > > + ret = gen_pool_add(muram_pool, r.start - muram_pbase + > > + GENPOOL_OFFSET, resource_size(&r), -1); > > + if (ret) { > > + pr_err("QE: couldn't add muram to > pool!\n"); > > + goto err; > > + } > > + > > + } > > + > > + muram_vbase = ioremap(muram_pbase, max - muram_pbase + 1); > > + if (!muram_vbase) { > > + pr_err("Cannot map QE muram"); > > + ret = -ENOMEM; > > + goto err; > > + } > > + goto out; > > +err: > > + gen_pool_destroy(muram_pool); > > +out: > > + of_node_put(np); > > + return ret; > > +} > > + > > +/* > > + * qe_muram_alloc - allocate the requested size worth of multi-user > > +ram > > + * @size: number of bytes to allocate > > + * @align: requested alignment, in bytes > > + * > > + * This function returns an offset into the muram area. > > + */ > > +unsigned long qe_muram_alloc(unsigned long size, unsigned long align) > > +{ > > + unsigned long start; > > + unsigned long flags; > > + struct muram_block *entry; > > + > > + spin_lock_irqsave(&qe_muram_lock, flags); > > + muram_pool_data.align = align; > > + gen_pool_set_algo(muram_pool, gen_pool_first_fit_align, > > + &muram_pool_data); > > + start = gen_pool_alloc(muram_pool, size); > > + if (!start) > > + goto out2; > > + start = start - GENPOOL_OFFSET; > > + memset(qe_muram_addr(start), 0, size); > > + entry = kmalloc(sizeof(*entry), GFP_KERNEL); > > + if (!entry) > > + goto out1; > > + entry->start = start; > > + entry->size = size; > > + list_add(&entry->head, &muram_block_list); > > + spin_unlock_irqrestore(&qe_muram_lock, flags); > > + > > + return start; > > +out1: > > + gen_pool_free(muram_pool, start, size); > > +out2: > > + spin_unlock_irqrestore(&qe_muram_lock, flags); > > + return (unsigned long) -ENOMEM; > > +} > > +EXPORT_SYMBOL(qe_muram_alloc); > > + > > +/* > > + * qe_muram_alloc_fixed - reserve a specific region of multi-user ram > > + * @size: number of bytes to allocate > > + * @offset: offset of allocation start address > > + * > > + * This function returns an offset into the muram area. > > + */ > > +unsigned long qe_muram_alloc_fixed(unsigned long offset, unsigned > > +long > > size) > > +{ > > + > > + unsigned long start; > > + unsigned long flags; > > + unsigned long size_alloc = size; > > + struct muram_block *entry; > > + int end_bit; > > + int order = muram_pool -> min_alloc_order; > > + > > + spin_lock_irqsave(&qe_muram_lock, flags); > > + end_bit = (offset >> order) + ((size + (1UL << order) - 1) >> > order); > > + if ((offset + size) > (end_bit << order)) > > + size_alloc = size + (1UL << order); > > + > > + muram_pool_data_fixed.offset = offset + GENPOOL_OFFSET; > > + gen_pool_set_algo(muram_pool, gen_pool_fixed_fit, > > + &muram_pool_data_fixed); > > + start = gen_pool_alloc(muram_pool, size_alloc); > > + if (!start) > > + goto out2; > > + start = start - GENPOOL_OFFSET; > > + memset(qe_muram_addr(start), 0, size_alloc); > > + entry = kmalloc(sizeof(*entry), GFP_KERNEL); > > + if (!entry) > > + goto out1; > > + entry->start = start; > > + entry->size = size_alloc; > > + list_add(&entry->head, &muram_block_list); > > + spin_unlock_irqrestore(&qe_muram_lock, flags); > > + > > + return start; > > +out1: > > + gen_pool_free(muram_pool, start, size_alloc); > > +out2: > > + spin_unlock_irqrestore(&qe_muram_lock, flags); > > + return (unsigned long) -ENOMEM; > > + > > + > > +} > > +EXPORT_SYMBOL(qe_muram_alloc_fixed); > > + > > +/** > > + * qe_muram_free - free a chunk of multi-user ram > > + * @offset: The beginning of the chunk as returned by qe_muram_alloc(). > > + */ > > +int qe_muram_free(unsigned long offset) { > > + unsigned long flags; > > + int size; > > + struct muram_block *tmp; > > + > > + size = 0; > > + spin_lock_irqsave(&qe_muram_lock, flags); > > + list_for_each_entry(tmp, &muram_block_list, head) { > > + if (tmp->start == offset) { > > + size = tmp->size; > > + list_del(&tmp->head); > > + kfree(tmp); > > + break; > > + } > > + } > > + gen_pool_free(muram_pool, offset + GENPOOL_OFFSET, size); > > + spin_unlock_irqrestore(&qe_muram_lock, flags); > > + > > + return size; > > +} > > +EXPORT_SYMBOL(qe_muram_free); > > + > > +/** > > + * qe_muram_addr - turn a muram offset into a virtual address > > + * @offset: muram offset to convert > > + */ > > +void __iomem *qe_muram_addr(unsigned long offset) { > > + return muram_vbase + offset; > > +} > > +EXPORT_SYMBOL(qe_muram_addr); > > + > > +unsigned long qe_muram_offset(void __iomem *addr) { > > + return addr - (void __iomem *)muram_vbase; } > > +EXPORT_SYMBOL(qe_muram_offset); > > + > > +/** > > + * qe_muram_dma - turn a muram virtual address into a DMA address > > + * @offset: virtual address from qe_muram_addr() to convert */ > > +dma_addr_t qe_muram_dma(void __iomem *addr) { > > + return muram_pbase + ((u8 __iomem *)addr - muram_vbase); } > > +EXPORT_SYMBOL(qe_muram_dma); > > Why are you adding new functions rather than replacing the implementation > of the old ones? > > Again, I don't want to see a big addition in one place and a big deletion > elsewhere. I want to see the actual code changes as a diff. Any moving > around of code must be a separate patch from making changes to it that > are significant enough that git format-patch doesn't detect it as a move.
Modify cpm_muram functions with genalloc first, Then move it to qe_muram with churn of cpm_muram_* and qe_mura_*? Or other method?
> > -Scott
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