From: "Lad, Prabhakar" <prabhakar.csengg@gmail.com>
To: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Cc: Prabhakar Mahadev Lad <prabhakar.mahadev-lad.rj@bp.renesas.com>,
Kishon Vijay Abraham I <kishon@ti.com>,
Bjorn Helgaas <bhelgaas@google.com>,
Rob Herring <robh+dt@kernel.org>,
Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
Andrew Murray <amurray@thegoodpenguin.co.uk>,
Tom Joseph <tjoseph@cadence.com>,
Jingoo Han <jingoohan1@gmail.com>,
Gustavo Pimentel <gustavo.pimentel@synopsys.com>,
Marek Vasut <marek.vasut+renesas@gmail.com>,
Shawn Lin <shawn.lin@rock-chips.com>,
Heiko Stuebner <heiko@sntech.de>,
Geert Uytterhoeven <geert+renesas@glider.be>,
"linux-pci@vger.kernel.org" <linux-pci@vger.kernel.org>,
"devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-renesas-soc@vger.kernel.org"
<linux-renesas-soc@vger.kernel.org>,
"linux-rockchip@lists.infradead.org"
<linux-rockchip@lists.infradead.org>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>
Subject: Re: [PATCH v8 5/8] PCI: endpoint: Add support to handle multiple base for mapping outbound memory
Date: Mon, 20 Apr 2020 10:17:08 +0100 [thread overview]
Message-ID: <CA+V-a8vkZwgOf8gkxWU62A3L1BTXw_y2H5MGo-7-+ad28q1tWQ@mail.gmail.com> (raw)
In-Reply-To: <TYAPR01MB4544FDF2FEDBED104F6C6C45D8D40@TYAPR01MB4544.jpnprd01.prod.outlook.com>
Hi Yoshihiro,
Thank you for the review.
On Mon, Apr 20, 2020 at 10:04 AM Yoshihiro Shimoda
<yoshihiro.shimoda.uh@renesas.com> wrote:
>
> Hi Prabhakar-san,
>
> Thank you for the patch!
>
> > From: Lad Prabhakar, Sent: Sunday, April 19, 2020 10:27 PM
> <snip>
> > @@ -109,11 +137,22 @@ EXPORT_SYMBOL_GPL(pci_epc_mem_init);
> > */
> > void pci_epc_mem_exit(struct pci_epc *epc)
> > {
> > - struct pci_epc_mem *mem = epc->mem;
> > + struct pci_epc_mem *mem;
> > + int i;
> >
> > + if (!epc->num_windows)
> > + return;
> > +
> > + for (i = 0; i <= epc->num_windows; i++) {
>
> I'm sorry, I overlooked when I reviewed before.
> This condition should be "i < epc->num_windows".
>
Argh my bad, will fix it.
> > + mem = epc->windows[i];
> > + kfree(mem->bitmap);
> > + kfree(mem);
> > + }
> > + kfree(epc->windows);
> > +
> > + epc->windows = NULL;
> > epc->mem = NULL;
> > - kfree(mem->bitmap);
> > - kfree(mem);
> > + epc->num_windows = 0;
> > }
> > EXPORT_SYMBOL_GPL(pci_epc_mem_exit);
> >
> > @@ -129,31 +168,57 @@ EXPORT_SYMBOL_GPL(pci_epc_mem_exit);
> > void __iomem *pci_epc_mem_alloc_addr(struct pci_epc *epc,
> > phys_addr_t *phys_addr, size_t size)
> > {
> > - int pageno;
> > void __iomem *virt_addr = NULL;
> > - struct pci_epc_mem *mem = epc->mem;
> > - unsigned int page_shift = ilog2(mem->page_size);
> > + struct pci_epc_mem *mem;
> > + unsigned int page_shift;
> > + size_t align_size;
> > + int pageno;
> > int order;
> > + int i;
> >
> > - size = ALIGN(size, mem->page_size);
> > - order = pci_epc_mem_get_order(mem, size);
> > -
> > - mutex_lock(&mem->lock);
> > - pageno = bitmap_find_free_region(mem->bitmap, mem->pages, order);
> > - if (pageno < 0)
> > - goto ret;
> > + for (i = 0; i < epc->num_windows; i++) {
> > + mem = epc->windows[i];
> > + mutex_lock(&mem->lock);
> > + align_size = ALIGN(size, mem->window.page_size);
> > + order = pci_epc_mem_get_order(mem, align_size);
> >
> > - *phys_addr = mem->phys_base + ((phys_addr_t)pageno << page_shift);
> > - virt_addr = ioremap(*phys_addr, size);
> > - if (!virt_addr)
> > - bitmap_release_region(mem->bitmap, pageno, order);
> > + pageno = bitmap_find_free_region(mem->bitmap, mem->pages,
> > + order);
> > + if (pageno >= 0) {
> > + page_shift = ilog2(mem->window.page_size);
> > + *phys_addr = mem->window.phys_base +
> > + ((phys_addr_t)pageno << page_shift);
> > + virt_addr = ioremap(*phys_addr, align_size);
> > + if (!virt_addr)
> > + bitmap_release_region(mem->bitmap,
> > + pageno, order);
>
> I'm sorry here again. But, I think we should call mutex_unlock() and "continue;"
> here if ioremap() failed for trying remaining windows. What do you think?
>
If ioremap() has failed something has really went wrong with the
system, but there is no harm in trying other windows. So Ill add the
code as suggested above.
Cheers,
--Prabhakar
> > + mutex_unlock(&mem->lock);
> > + return virt_addr;
> > + }
> > + mutex_unlock(&mem->lock);
> > + }
> >
> > -ret:
> > - mutex_unlock(&mem->lock);
> > return virt_addr;
> > }
> > EXPORT_SYMBOL_GPL(pci_epc_mem_alloc_addr);
>
> Best regards,
> Yoshihiro Shimoda
>
next prev parent reply other threads:[~2020-04-20 9:17 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-19 13:26 [PATCH v8 0/8] Add support for PCIe controller to work in endpoint mode on R-Car/RZ/G2x SoCs Lad Prabhakar
2020-04-19 13:26 ` [PATCH v8 1/8] PCI: rcar: Rename pcie-rcar.c to pcie-rcar-host.c Lad Prabhakar
2020-04-19 13:26 ` [PATCH v8 2/8] PCI: rcar: Move shareable code to a common file Lad Prabhakar
2020-04-19 13:26 ` [PATCH v8 3/8] PCI: rcar: Fix calculating mask for PCIEPAMR register Lad Prabhakar
2020-04-19 13:26 ` [PATCH v8 4/8] PCI: endpoint: Pass page size as argument to pci_epc_mem_init() Lad Prabhakar
2020-04-19 13:27 ` [PATCH v8 5/8] PCI: endpoint: Add support to handle multiple base for mapping outbound memory Lad Prabhakar
2020-04-20 9:04 ` Yoshihiro Shimoda
2020-04-20 9:17 ` Lad, Prabhakar [this message]
2020-04-19 13:27 ` [PATCH v8 6/8] dt-bindings: PCI: rcar: Add bindings for R-Car PCIe endpoint controller Lad Prabhakar
2020-04-19 13:27 ` [PATCH v8 7/8] PCI: rcar: Add endpoint mode support Lad Prabhakar
2020-04-21 4:08 ` Yoshihiro Shimoda
2020-04-21 8:58 ` Lad, Prabhakar
2020-04-19 13:27 ` [PATCH v8 8/8] MAINTAINERS: Add file patterns for rcar PCI device tree bindings Lad Prabhakar
2020-04-19 16:36 ` Joe Perches
2020-04-19 19:10 ` Lad, Prabhakar
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